Display device

A liquid crystal panel includes an array substrate, a row control circuit, a first trace, a second trace, a gate insulating film, and an organic insulating film. The array substrate 11b includes a display area and a non-display area. The row control circuit is arranged in the non-display area. The first trace is a component of the row control circuit. The second trace is a component of the row control circuit and arranged over the first trace so as to cross the first trace. The gate insulating film is arranged between the first trace and the second trace. The organic insulating film includes a hole formed in an area that overlaps at least crossing portions of the first trace and the second trace. The organic insulating film is made of organic resin.

TECHNICAL FIELD

The present invention relates to a display device.

BACKGROUND ART

A liquid crystal panel that is a main component of a known liquid crystal display device has the following configuration. The liquid crystal panel includes a pair of glass substrates and liquid crystals that are sandwiched between the glass substrates and sealed with a sealing member provided around the liquid crystals. The substrates are an array substrate and a CF substrate. TFTs that are switching components, pixel electrodes, and traces are formed on the array substrate. Color filters are formed on the CF substrate. A liquid crystal panel disclosed in Patent Document 1 has been known as an example of such a liquid crystal panel.

RELATED ART DOCUMENT

Patent Document

Patent Document 1: Japanese Unexamined Patent Application Publication No. 2010-164653

Problem to be Solved by the Invention

A monolithic circuit section including a gate driver circuit is formed in a non-display area of the array substrate in Patent Document 1 around a display area that is for displaying images. The circuit section is located closer to the sealing member than the TFTs disposed in the display area. If moisture that exits outside the sealing member passes through the sealing member, the circuit section is more likely to be subject to the moisture. Specifically, at crossing portions of traces which cross other traces via an insulating film in the circuit section, electric fields are created when the traces are conducted. If metal ions are generated at the crossing portions due to the moisture, the metal ions may move under the influence of the electric field, that is, an ion migration (electrochemical migration) may occur. If the ion migration occurs, a short circuit may occur between the traces at the crossing portion and thus operation reliability of the circuit section may decrease. Specifically in a liquid crystal panel that includes a narrowed frame, a non-display area and an area in which the circuit section is arranged are narrow and thus distribution density of the traces is high. Due to the high distribution density of the traces, the ion migration is more likely to occur between the traces at the crossing portion.

DISCLOSURE OF THE PRESENT INVENTION

The technology disclosed in this description was made in view of the above circumstances. An object is to improve operation reliability.

Means for Solving the Problem

A display device according to the technology described herein includes a substrate, a circuit, a first trace, a second trace, an insulating film, and an organic insulating film. The substrate includes a display area and a non-display area. The display area is for displaying images and located in a central portion of the substrate. The non-display area is located in an outer portion of the substrate and surrounds the display area. The circuit is arranged in the non-display area. The first trace is a component of the circuit. The second trace is a component of the circuit arranged over the first trace so as to cross the first trace. The insulating film is arranged between the first trace and the second trace. The organic insulating film is arranged over the second trance and includes a hole in an area overlapping at least crossing portions of the first trace and the second trace. The organic insulating film is made of organic resin.

In the circuit, the first trace and the second trace arranged over the first trace are arrange so as to cross each other via the insulating film. When the traces are electrically conducted, an electric field is generated around the crossing portion. The non-display area is located in the outer area of the substrate and surrounds the display area in the central portion of the substrate. Therefore, in comparison to the display area, the circuit arranged in the non-display area is subject to moisture that exists outside. In the circuit, the organic insulating film made of organic resin is arranged over the second trace. The organic resin tends to absorb moisture. Therefore, metal ions may be produced at the crossing portion, at which the traces cross each other, due to the moisture in the organic insulating film. The metal ions may be attracted by the electric fields and move, that is, so-called ion migration (or electrochemical migration) may occur. In some cases, short circuits may occur among crossing portions. If the frame of the liquid crystal panel11is further narrowed and the non-display areas and the area in which the circuit is arranged are reduced or the definition is further improved, the distribution density of the traces and increases. Therefore, the ion migration is more likely to occur at the crossing portions of the traces. Because the organic insulating film includes the hole formed in the area that overlaps the crossing portion at which the first trace and the second trace crosses each other, the moisture contained in the organic insulating film is less likely to affect the crossing portion of the traces. Therefore, the ion migration is less likely to occur at the crossing portions of the traces and thus the short circuit is less likely to occur between the crossing portions. According to the configuration, a malfunction of the circuit is less likely to occur and thus the operation reliability thereof improves. This is preferable for the display device with the frame that is further narrowed or with the definition that is further improved.

Preferable embodiments of the display device may include the following configurations.

(1) The hole of the organic insulating film is formed in an area larger than the area that overlaps at least the crossing portion. In comparison to a configuration in which the hole is formed in an area that overlaps only the crossing portion of the traces, a distance from an opening edge of the hole in the organic insulating film to the crossing portion of the traces is larger. Therefore, the moisture contained in the organic insulating film is less likely to affect the crossing portion of the traces. Furthermore, even if a position at which the hole is formed in the organic insulating film is shifted due to a production matter, the misalignment can be compensated. Therefore, the organic insulating film is less likely to overlap the crossing portion and the hole is more likely to be formed in the area that overlaps the crossing portion of the traces. According to the configuration, the ion migration is less likely to occur at the crossing portions of the traces and thus the operation reliability of the circuit further improves.

(2) At least one of the first trace and the second trace may include a plurality of traces such that crossing portions are arranged at intervals. The hole of the organic insulating film may be formed in an area that covers at least a plurality of the crossing portions. Because the opening edges of the hole collectively surround the crossing portions arranged at intervals, the organic insulating film does not exist among the crossing portions. Therefore, even if the moisture is contained in the organic insulating film, the moisture is less likely to affect the crossing portions. Furthermore, even if the hole is formed in the organic insulating film at a shifted position due to a production matter and portions of the opening edges of the hole overlap the crossing portions, the overlaps are small. According to the configuration, the ion migration is less likely to occur at the crossing portions of the traces. Therefore, the operation reliability of the circuit further improves.

(3) At least one of the first trace and the second trace may include a plurality of traces such that at least three crossing portions are arranged at intervals. The hole of the organic insulating film may include at least a first hole and a second hole. The first hole may be formed in an area that covers at least two crossing portions arranged at the interval that is relatively small and the second hole may be formed in an area that covers at least two crossing portions arranged at the interval that is relatively large and not overlapping the first hole. Because the opening edges of the first hole in the organic insulating film collectively surround two crossing portions that are at the interval that is relatively small, the organic insulating film does not exist between the crossing portions. Even if the moisture is contained in the organic insulating film, the moisture is less likely to affect the crossing portions arranged at the interval that is relatively small. Furthermore, even if the hole is formed in the organic insulating film at a shifted position due to a production matter and portions of the opening edges of the first hole overlap the crossing portions arranged at the arrangement interval that is relatively small, the overlaps are small. According to the configuration, the ion migration is less likely to occur at the crossing portions arranged at the interval that is relatively small. Therefore, the reliability of the circuit further improves. Furthermore, because the organic insulating film includes the second holes each formed in the area that overlaps the crossing portions arranged at the interval that is relatively large, and so as not to overlap the first hole, the organic insulating film exists between the crossing portions, the arrangement interval of which is relatively large. According to the configuration, the organic insulating film is less likely to be excessively removed and thus the functions of the organic insulating film for flattening and protecting the traces are less likely to decrease.

(4) A counter substrate opposed to the substrate, liquid crystals sandwiched between the substrate and the counter substrate, and a sealing member provided between the substrate and the counter substrate, surrounding the liquid crystals, and sealing the liquid crystals may be included. The circuit is arranged closer to the sealing member than to the display area. The liquid crystals that are sandwiched between the substrate and the counter substrate are sealed with the sealing member that surrounds the liquid crystals. Because the circuit is arranged closer to the sealing member than the display area, if the moisture passes through the sealing member, the circuit is subject to the moisture. As described above, the organic insulating film includes the hole formed in the area that overlaps the crossing portions of the first traces and the second traces. Therefore, even if the moisture that has passed the sealing member is absorbed by the organic insulating film, the moisture is less likely to affect the crossing portions of the traces and thus the ion migration is less likely to occur at the crossing portions. According to the configuration, the malfunction of the circuit is less likely to occur.

(5) A first interlayer insulating film arranged between the organic insulating film and the second trace and in an area that overlaps at least the hole may be included. Because the crossing portions of the second trace which cross the first trace are covered with the first interlayer insulating film. Therefore, waterproof performance (moisture resistance) at the crossing portions improves. According to the configuration, the ion migration is less likely to occur at the crossing portions of the traces and thus the operation reliability of the circuit further improves.

(6) A transparent electrode film arranged over the organic insulating film in an area that overlaps at least the hole may be included. Because the crossing portions of the second trace which cross the first trace are covered with the second transparent electrode film in addition to the first interlayer film, the waterproof performance at the crossing portions further improves. According to the configuration, the ion migration is further less likely to occur at the crossing portions of the traces and thus the operation reliability of the circuit further improves.

(7) The transparent electrode film may include a first transparent insulating film and a second transparent insulating film. The first transparent insulating film is in a lower layer and the second transparent insulating film is in an upper layer. A second interlayer insulating film arranged between the first transparent electrode film and the second transparent electrode film and in an area that overlaps at least the hole may be included. Because the crossing portions of the second trace which cross the first trace are covered with the first transparent electrode film, the second interlayer insulating film, and the second transparent electrode film in addition to the first interlayer insulating film, the waterproof performance at the crossing portions further improves. According to the configuration, the ion migration is further less likely to occur at the crossing portions of the traces and thus the operation reliability of the circuit further improves.

(8) A protective film arranged between the second trace and the insulating film and in an area that overlaps at least the hole may be included. In addition to the insulating film, the protective film is arranged between the crossing portions of the first trace and the second trace. Therefore, the short circuit due to the ion migration is further less likely to occur at the crossing portions and thus the operation reliability of the circuit further improves.

(9) The first trace and the second trace contain at least copper. In comparison to a configuration that contains aluminum, the first trace and the second trace that contain copper have higher electric conductivity but they are subject to corrosion due to the moisture. As described earlier, the organic insulating film includes the hole in the area that overlaps the crossing portions of the first trace and the second trace. Therefore, the moisture contained in the organic insulating film is less likely to affect the crossing portions of the traces and thus the ion migration is less likely to occur at the crossing portions of the traces. According to the configuration, the operation reliability of the circuit is maintained at a high level while the traces have preferable electric conductivities.

(10) A thin film transistor using an oxide semiconductor for a semiconductor film thereof may be included. The circuit may include the semiconductor film arranged between the second trace and the insulating film. The oxide semiconductor, from which the semiconductor film is formed, has higher electron mobility in comparison to an amorphous semiconductor. Therefore, when circuit components are formed from the semiconductor film for the circuit, the circuit components can have various functions. This configuration is preferable for adding various functions to the circuit.

(11) The oxide semiconductor may contain indium (In), gallium (Ga), zinc (Zn), and oxygen (O). This configuration is preferable for adding various functions to the circuit.

Advantageous Effect of the Invention

According to the technology described herein, the operation reliability improves.

MODE FOR CARRYING OUT THE INVENTION

First Embodiment

A first embodiment will be described with reference toFIGS. 1 to 11. X-axes, Y-axes, and Z-axes may be present in the drawings. The axes in each drawing correspond to the respective axes in other drawings. The Y-axis direction corresponds to a vertical direction inFIGS. 2 to 4. An upper side inFIGS. 2 to 4corresponds to a front side of the liquid crystal display device10. A lower side inFIGS. 2 to 4corresponds to a rear side of the liquid crystal display device10.

As illustrated inFIGS. 1 and 2, the liquid crystal display device10includes a liquid crystal panel (a display device, a display panel)11, a control circuit board (an external signal supply)12, a driver (a panel driver)21, a flexible printed circuit board (an external connecting member)13, and a backlight unit (a lighting unit)14. The liquid crystal panel11includes a display area AA and non-display areas NAA. The display area AA is configured to display images and arranged in an inner portion of the liquid crystal panel11. The non-display area NAA is arranged in an outer portion of the liquid crystal panel11so as to surround the display area AA. The driver is for driving the liquid crystal panel11. The control circuit board12is for supplying various input signals from the outside to the driver21. The flexible circuit board13is for electrically connecting the liquid crystal panel11to the external control circuit board12. The backlight unit14is an external light source for supplying light to the liquid crystal panel11. The liquid crystal display device10further includes exterior components15and16used in a pair of front and rear. The exterior component15in front includes a hole15aso that images displayed in the display area AA of the liquid crystal panel11are viewable from the outside. The liquid crystal display device10according to this embodiment is for various kinds of electronic devices (not illustrated) including mobile phones (including smartphones), notebook computers (including tablet computers), handheld terminals (including electronic book readers and PDAs), digital photo frames, portable video game players, and electronic papers. Therefore, a screen size of the liquid crystal panel11of the liquid crystal display device10is in a range from some inches to ten and some inches, that is, the size commonly categorized as small size or small-to-mid size.

The backlight unit14will be described. As illustrated inFIG. 2, the backlight unit14includes a chassis14a, light sources that are not illustrated, and an optical member that are not illustrated. The chassis14ahas a box-like shape with an opening on the front side (a liquid crystal panel11side). The light sources (e.g., cold cathode tubes, LEDs, and organic ELs) are disposed inside the chassis14a. The optical member is disposed over the opening of the chassis14a. The optical member has a function for converting light from the light sources into planar light.

Next, the liquid crystal panel11will be described. As illustrated inFIG. 1, the liquid crystal panel11has a vertically-long quadrilateral (or rectangular) overall shape. The display area (an active area) AA is arranged off-centered to one of edges at an end of a long dimension of the liquid crystal panel11(on the upper side inFIG. 1). The driver21and the flexible circuit board13are mounted to a portion of the liquid crystal panel11closer to an edge at the other end of the long dimension of the liquid crystal panel11(on the lower side inFIG. 1). Areas of the liquid crystal panel11outside the display area AA are the non-display areas (non-active areas) NAA in which images area not displayed. The non-display areas NAA include a frame-shaped area and an edge area. The frame-shape area surrounds the display area AA (a frame portion of the CF substrate11a, which will be described later). The edge area is a reserved area closer to the other edge of the long dimension of the liquid crystal panel11(a portion of the array substrate11bthat does not overlap the CF substrate11a, which will be described later). The reserved area includes a mounting area (an attachment area) to which the driver21and the flexible circuit board13are mounted. A width (or a frame width) of three sections of the frame-shaped non-display area of the liquid crystal panel11other than the mounting area for the driver21and the flexible circuit board13(non-mounting area end portions), more specifically, a linear distance from an outer edge of a glass substrate GS to an outer edge of the display area AA is equal to or smaller than 1.9 mm, more preferably, equal to or smaller than 1.3 mm. Namely, the liquid crystal panel11has a narrow frame structure including a significantly narrow frame. A short-side direction of the liquid crystal panel11corresponds to the X-axis direction in each drawing and a long-side direction of the liquid crystal panel11corresponds to the Y-axis direction in each drawing. InFIGS. 1, 5 and 6, a boxed chain line slightly smaller than the CF substrate11aindicates an outer boundary of the display area AA and the areas outside the chain line are the non-display areas NAA.

Next, components connected to the liquid crystal panel11will be described. As illustrated inFIGS. 1 and 2, the control circuit board12is mounted to the back surface of the chassis14aof the backlight unit14(an outer surface far from the liquid crystal panel11) with screws. The control circuit board12includes a substrate made of paper phenol of glass epoxy resin and electronic components for supplying various kinds of input signals to the driver21are mounted on the substrate. Furthermore, traces routed in predefine pattern (electrically conducting paths), which are not illustrated, are formed on the substrate. One of ends (one end) of the flexible circuit board13is electrically and mechanically connected to the control circuit board12via an anisotropic conductive film (ACF), which is not illustrated.

As illustrated inFIG. 2, the flexible circuit board (an FPC board)13includes a base made of synthetic resin having insulating properties and flexibility (e.g., polyimide resin) and multiple traces (not illustrated) formed on the base. As described earlier, one of ends of the flexible circuit board13at an end of a length direction thereof is connected to the control circuit board12disposed on the back surface of the chassis14a. The other end of the flexible circuit board13(another end) is connected to the array board11bof the liquid crystal panel11. Therefore, the flexible circuit board13is folded in the liquid crystal display device10such that a cross-sectional shape is substantially U shape. The traces are exposed to the outside at the ends of the flexible circuit board13at the ends of the length direction and provides as terminals (not illustrated). The terminals are electrically connected to the control circuit board12and the liquid crystal panel11. According to the configuration, the input signals supplied by the control circuit board12are transmitted to the liquid crystal panel11.

As illustrated inFIG. 1, the driver21is an LSI chip including a drive circuit therein. The driver21is configured to operate based on signals supplied by the control circuit board12that is a signal source for processing the input signals supplied by the control circuit board12that is a signal source, generate output signals, and transmit the output signals to the display area AA of the liquid crystal panel11. The driver21has a horizontally-long rectangular shape in a plan view (a longitudinal shape along the short edge of the liquid crystal panel11) and is directly mounted on the liquid crystal panel11(the array substrate11b, which will be described later) in the non-display area AA, that is, through chip-on-glass (COG) mounting. A long-side direction of the driver21corresponds to the X-axis direction (the short-side direction of the liquid crystal panel11) and a short-side direction thereof corresponds to the Y-axis direction (the long-side direction of the liquid crystal panel11).

The liquid crystal panel11will be described once again. As illustrated inFIG. 3, the liquid crystal panel11includes at least a pair of substrates11aand11b, a liquid crystal layer (liquid crystals)11c, a sealing member11j. The liquid crystal layer11cbetween the substrates11aand11band includes liquid crystal molecules that are substances having optical characteristics that change according to application of electric field. The sealing member11jbetween the substrates11aand11bseals the liquid crystal layer11cwhile a size of a gap between the boards11aand11bis maintained at the thickness of the liquid crystal layer11c. One of the substrates11aand11bat the front is the CF substrate (a counter substrate)11aand one at the rear is the array substrate (a substrate)11b. The sealing member11jis disposed in the non-display area NAA of the liquid crystal panel11. The sealing member11jhas a vertically-long frame-like shape along the non-display area NAA in a plan view (in a direction normal to a plate surface of the array board11b) (FIG. 2). Portions of the sealing member11jdisposed on three edge portions of the liquid crystal panel11(non-mounting edge portions) other than the mounting area for the driver21and the flexible circuit board13are located at the outermost of the non-display area NAA (FIG. 2). Polarizing plates11fand11gare attached to outer surfaces of the substrates11aand11b, respectively.

The liquid crystal panel11according to this embodiment operates in fringe field switching (FFS) mode that is an operation mode further improved from an in-plane switching (IPS) mode. As illustrated inFIG. 4, the liquid crystal panel11includes pixel electrodes (second transparent electrodes)18and a common electrode (a first transparent electrode)22, which will be described later, formed on the array substrate11bthat is one of the substrates11aand11b. The pixel electrodes18and the common electrode22are formed in different layers. The CF substrate11aand the array substrate11binclude glass substrates GS that are substantially transparent (having high light transmissivity) and various kinds of films formed in layers on the glass substrates GS. As illustrated inFIGS. 1 and 2, the CF substrate11ahas a short dimension substantially equal to that of the array substrate11band a long dimension smaller than that of the array substrate11b. The CF substrate11ais bonded to the array substrate11bwith one of edges at an end of the long-side direction (on the upper side inFIG. 1) aligned with that of the array substrate11b. A predefined portion of the array board11badjacent to the other edge at the other end of the long-side direction (on the lower side inFIG. 1) does not overlap the CF substrate11a, that is, front and back plate surfaces of the array substrate11bare exposed to the outside. The mounting area for the driver21and the flexible circuit board13is provided in this portion. Alignment films11dand11efor alignment of the liquid crystal molecules included in the liquid crystal layer11care formed on inner surfaces of the substrates11aand11b.

Various kinds of films formed in layers on the inner surface of the array substrate11b(on the liquid crystal layer11cside, a surface opposed to the CF substrate11a) using a known photolithography method will be described. As illustrated inFIG. 8, on the array substrate11b, a first metal film (a gate metal film)34, a gate insulating film (an insulating film)35, a semiconductor film36, a protective film (an etching stopper film, an ES film)37, a second metal film (a source metal film)38, a first interlayer insulating film39, an organic insulating film40, a first transparent electrode film23, a second interlayer insulating film41, a second transparent electrode film24, and the alignment film lie are formed in layers in this sequence from the lower layer side (the glass substrate GS side).

The first metal film34is a multilayered film of titanium (Ti) and copper (Cu). In comparison to a multilayered configuration of titanium and aluminum (Al), the first metal film has lower wiring resistance and proper electric conductivity. The gate insulating film35is layered over at least the first metal film34. The gate insulating film35is made of silicon oxide (SiO2), which is an inorganic material. The semiconductor film36is layered over the gate insulating film35. The semiconductor film36is a thin film using an oxide semiconductor. The oxide semiconductor of the semiconductor film36is an In—Ga—Zn—O semiconductor (indium gallium zinc oxide) which contains indium (In), gallium (Ga), zinc (Zn), and oxygen (O). The In—Ga—Zn—O semiconductor is a ternary oxide of indium (In), gallium (Ga), and zinc (Zn) and a ratio (a composition ratio) of In, Ga, and Zn is not limited to a specific ratio. For example, the ratio may be: In:Ga:Zn=2:2:1, In:Ga:Zn=1:1:1, or In:Ga:Zn=1:1:2. This embodiment includes the In—Ga—Zn—O semiconductor containing In, Ga, and Zn in the ratio of 1:1:1.

The protective film37is layered over at least the semiconductor film36and made of silicon oxide (SiO2), which is an inorganic material. The second metal film38is layered over the protective film37. The second metal film38is a multilayered film of titanium (Ti) and copper (Cu). In comparison to a multilayered structure of titanium and aluminum (Al), the second metal film has lower wiring resistance and proper electric conductivity. The first interlayer insulating film39is layered over at least the second metal film38and made of silicon oxide (SiO2), which is an inorganic material. The organic insulating film40is layered over the first interlayer insulating film39and made of acrylic resin (e.g., polymethylmethacrylate resin (PMMA)), which is an organic resin material. The organic resin material of the organic insulating film40has photosensitivity. Therefore, in a production process of the array substrate11b, the organic insulating film40is patterned using a known photolithography method. The first transparent electrode film23is layered over the organic insulating film40and made of transparent electrode material such as indium tin oxide (ITO) and zinc oxide (ZnO). The second interlayer insulating film41is layered over at least the first transparent electrode film23and made of silicon nitride (SiNx), which is an inorganic material. The second transparent electrode film24is layered over the second interlayer insulating film41and made of transparent electrode material such as indium tin oxide (ITO) and zinc oxide (ZnO). The alignment film11eis layered over at least the second transparent electrode film24so as to face the liquid crystal layer11c. The alignment film11eis a photo-alignment film made of polyimide to which a beam of light in a specific wavelength range (e.g., ultraviolet ray) is applied in a production process and configured so that the liquid crystal molecules can be aligned along a direction in which the beam of light is applied. The organic insulating film40among the insulating films37and39to41has a thickness larger than those of the inorganic insulating films37,39and41. The organic insulating film40functions as a planarization film. The gate insulating film35, the protective film37, the first interlayer insulating film39, and the second interlayer insulating film41among the insulating films37and39to41except for the organic insulating film40are inorganic insulating films made of inorganic material having thicknesses smaller than that of the organic insulating film40. The insulating films37and39to41are formed on the array substrate11bfor about entire area as solid patterns (with openings in some areas). The first metal film34, the semiconductor film36, and the second metal film38are formed in predefined patterns in the display area AA and the non-display areas NAA of the array substrate11b.

Next, the components in the display area AA will be described in detail. As illustrated inFIGS. 6 and 7, in the display area AA of the array substrate11b, display area TFTs (thin film transistors)17, which are switching components, for the pixel electrodes18are arranged in a matrix. Gate lines (scanning lines, row control lines)19and source lines (column control lines, data lines)20are formed in grid patterns so as to surround the display area TFTs and the pixel electrodes18. Namely, the display area TFTs and the pixel electrodes18are arranged at crossing portions of the gate lines19and the source lines20formed in grid patterns so as to form a matrix. The gate lines19are formed from the first metal film34and the source lines are formed from the second metal film38. The gate insulating film35and the protective film37are arranged at crossing portions of the gate lines19and the source lines20. The gate lines19and the source lines20are connected to the gate electrodes17aand the source electrodes of the respective display area TFTs. The pixel electrodes18are connected to the drain electrodes17cof the respective display area TFTs (FIG. 8). As illustrated inFIG. 7, the gate electrodes17aare branches that branch off from the gate lines19, which linearly extend along the X-axis direction, and project along the Y-axis direction. The source electrodes17bare branches that branch off from the source lines20, which linearly extend along the Y-axis direction, and project along X-axis direction.

As illustrated inFIG. 8, each display area TFT17includes the gate electrode17a, a channel17d, a protective portion17e, the source electrode17b, and the drain electrode17c. The gate electrode17ais formed from the first metal film34. The channel17dis formed from the semiconductor film36and overlaps the gate electrode17ain a plan view. The protective portion17eis formed from the protective film37and includes two channel holes17e1and17e2that are through holes at positions overlapping the channel17din a plan view. The source electrode17bis formed from the second metal film38and connected to the channel17dthrough the channel hole17e1of the channel holes17e1and17e2. The drain electrode17cis formed from the second metal film38and connected to the channel17dthrough the other channel hole17e2of the channel holes17e1and17e2. The channel17dextends along the X-axis direction and bridges the source electrode17band the drain electrode17cto allow charge transfer between the electrodes17band17c. The source electrode17band the drain electrode17care opposed to each other in a direction in which the channel17dextends (the X-axis direction) with a predefined gap therebetween.

As illustrated inFIG. 7, the gate electrode17ais configured so as to branch off from the gate line19. An area in which the gate electrode17aoverlaps about an entire area of the source electrode in a plan view and a portion of the drain electrode17c(adjacent to a portion connected to the channel17d) in a plan view. In comparison to a configuration in which an area in which the gate electrode is formed overlaps about an entire area of the drain electrode17cin a plan view, a parasitic capacitance among the gate electrode17aand the source electrode17b, the drain electrode17c, the channel17d(hereinafter referred to as the Cgd capacitance) can be reduced and thus a percentage of the Cgd capacitance in a total capacitance of the display electrode decreases. Therefore, the Cgd capacitance is less likely to affect a voltage applied to the pixel electrode18. This configuration is more preferable for the liquid crystal panel11if it is provided with high definition and an area and a total capacitance of the display pixel are reduced. According to the area in which the gate electrode17ais formed defined as described above, as illustrated inFIGS. 7 and 8, the channel17dincludes an extending portion17d1. The extending portion17d1extends at a position at which the drain electrode17cis connected in an opposite direction to the source electrode17balong the X-axis direction (to the right inFIGS. 7 and 8) and includes an end portion (a portion) which does not overlap the gate electrode17ain a plan view. The semiconductor film36from which the channel17dis formed is an oxide semiconductor film as described earlier. The oxide semiconductor film has electron mobility 20 to 50 times higher than an amorphous silicon thin film. Therefore, the display area TFT17can be easily down sized and an amount of the transmitted light of the pixel electrode18can be maximized. It is preferable for increasing the definition and reducing power consumption of the backlight unit14. Furthermore, in comparison to a configuration in which the channel is made of amorphous silicon, with the channel17dmade of the oxide semiconductor, higher turn-off characteristics of the display area TFT17are achieved and an off-leak current is about one hundredth, which is significantly small. Therefore, a voltage holding rate of the pixel electrode18is high. It is effective for reducing the power consumption of the liquid crystal panel11. In the display area TFT17including such an oxide semiconductor film, the gate electrode17ais arranged in the lowermost layer and the channel17dis layered over the gate electrode17avia the gate insulating film35. Namely, the TFT17is an inverted staggered type having a layer structure similar to a TFT that includes a regular amorphous silicon thin film.

The pixel electrode18is formed from the second transparent electrode film24. The pixel electrode18is formed in an area defined by the gate lines19and the source lines20. The pixel electrode18has a vertically-long rectangular overall shape in a plan view and a comb-like shape with vertically-long slits that are not illustrated. As illustrated inFIG. 8, the pixel electrode18is formed on the second interlayer insulating film41. The second interlayer insulating film41is arranged between the pixel electrode18and the common electrode22, which will be described later. Contact holes CH are formed in the first interlayer insulating film39, the organic insulating film40, and the second interlayer insulating film41under the pixel electrode18at positions at which they overlap the drain electrode17cso as to extend through from the top to the bottom. The pixel electrode18is connected to the drain electrode17cthrough the contact holes CH. When a voltage is applied to the gate electrode17aof the display area TFT17, current flows between the source electrode17band the drain electrode17cvia the channel17dand a predefined voltage is applied to the pixel electrode18. The contact holes CH are arranged at a position that does not overlap the gate electrode17aand the channel17dthat is formed from the semiconductor film36in a plan view.

The common electrode22is formed in a substantially solid pattern from the first transparent electrode film23. The common electrode22is formed on the array substrate11bin at least the display area AA. As illustrated inFIG. 8, the common electrode22is arranged between the organic insulating film40and the second interlayer insulating film41. A common potential (a reference potential) is applied to the common electrode22through a common line that is not illustrated. Therefore, as described earlier, by controlling a potential applied to the pixel electrode18by the display area TFT17, a predefined potential difference is created between the electrodes18and22. When the potential difference is created between the electrodes18and22, a fringe electric field (a lateral electric field) including a component in the direction normal to the plate surface of the array substrate11bin addition to a component in a direction along the plate surface of the array substrate11bis applied to the liquid crystal layer11cthrough the slits of the pixel electrode18. Not only the alignment of the liquid crystal molecules included in the liquid crystal layer11cand existing in the slits but the alignment of the liquid crystal molecules included in the liquid crystal layer11cand existing on the pixel electrode18can be properly altered. According to the configuration, an opening rate of the liquid crystal panel11increases and a sufficient amount of transmitted light is achieved. Therefore, high viewing angle performance is achieved. A capacitance line (not illustrated) may be formed on the array substrate11b. The capacitive line may be parallel to the gate line19and cross the pixel electrode18so as to overlap via the gate insulating film35, the protective film37, the first interlayer insulating film39, the organic insulating film40, and the second interlayer insulating film41.

Next, components on the CF substrate11ain the display area AA will be described in detail. As illustrated inFIG. 4, color filters11hare formed on the CF substrate11a. The color filters11hinclude red (R), green (G), and blue (B) color portions arranged in a matrix so as to overlap the pixel electrodes18in a plan view. A light blocking layer (a black matrix)11iis formed among the color portions of the color filters11hto reduce color mixture. The light blocking layer11iis arranged so as to overlap the gate lines19and the source lines20that are described earlier in a plan view. The alignment film11dfor aligning the liquid crystal molecules in the liquid crystal layer11cis formed on the color filters11hand the light blocking layer11i. The alignment film11dis made of polyimide. In the production process, the alignment film11dis configured by applying light in a specific wavelength range (e.g., an ultraviolet ray) to be a photo alignment film that enables the alignment of the liquid crystal molecules along the direction in which the light is applied. In the liquid crystal panel11, the red (R), the green (G), and the blue (B) color portions and three pixel electrodes18opposed to three colors of the color portions form one display pixel, which is a unit of display. The display pixel includes a red pixel including the R color portion, a green pixel including the G color portion, and a blue pixel including the B color portion. The display pixels in each color are repeatedly arranged on the plate surface of the liquid crystal panel11along the row direction (the X-axis direction) so as to form a group of pixels. Groups of pixels are arranged along the column direction (the Y-axis direction) (FIGS. 4 and 5).

Next, components on the array substrate11bin the non-display area NAA (outside the display area AA) will be described in detail. As illustrated inFIG. 5, the column control circuit27is arranged in a portion of the array substrate11bin the non-display area adjacent to the short edge of the display area AA and the row control circuit (a circuit)28is arranged in a portion of the array substrate11bin the non-display area adjacent to the long edge of the display area AA. The column control circuit27and the row control circuit28are configured to control for supplying the output signals from the driver21to the display area TFTs. The column control circuit27and the row control circuit28are monolithic circuits formed on the array substrates11bwith the semiconductor film36used as a base similar to the display area TFTs. The column control circuit27and the row control circuit28include control circuits and circuit components for controlling the supply of the output signals to the display area TFTs. The circuit components of the control circuits include non-display area TFTs (non-display area thin film transistors) which are not illustrated using the semiconductor film36for channels. As illustrated inFIGS. 5 and 6, the column control circuit27and the row control circuit28are arranged closer to the middle of the non-display area NAA than the sealing member11j, that is, closer to the display area AA. The column control circuit27and the row control circuit28are arranged closer to the sealing member11jthan the display area TFTs17. InFIG. 5, the sealing member11jis indicated by a two-dashed chain line. InFIG. 6, the sealing member11jis indicated by a solid line. The column control circuit27and the row control circuit28are patterned on the array substrate11bthrough a known photo lithography method simultaneously with the display area TFTs17patterned in the production process of the array substrate11b.

As illustrated inFIG. 5, the column control circuit27is arranged adjacent to the short edge of the display area AA on the lower side inFIG. 5, that is, between the display area AA and the driver21with respect to the Y-axis direction. The column control circuit27is formed in a horizontally-long rectangular area that extends in the X-axis direction. As illustrated inFIGS. 5 and 6, the column control circuit27is connected to the source lines20arranged in the display area AA. The column control circuit27includes a switching circuit (an RGB switching circuit) for distributing image signals included in the output signals from the driver21to the source lines20. Specifically, the source lines20are arranged on the array substrate11balong the X-axis direction and parallel to one another in the display area AA. The source lines20are connected to the display area TFTs17for the red (R), the green (G), and blue (B) display pixels. The column control circuit27is configured to distribute the image signals from the driver21to the source lines for R, G, and B using the switching circuit. The column control circuit27may include an auxiliary circuit such as a level-shifter circuit and an ESD protection circuit.

As illustrated inFIG. 5, the row control circuit28is arranged adjacent to the long edge of the display area AA on the left side inFIG. 5. The row control circuit28is formed in a vertically-long rectangular area that extends in the Y-axis direction. As illustrated inFIGS. 5 and 6, the row control circuit28is connected to the gate lines19arranged in the display area AA. The row control circuit28includes a scanning circuit for scanning the gate lines in sequence with the scanning signals included in the output signals from the driver21supplied thereto at predefined timing. Specifically, the gate lines19are arranged on the array substrate11balong the Y-axis direction and parallel to one another in the display area. The row control circuit28is configured to scan the gate lines19using a scanning circuit to supply control signals (scan signals) from the driver21to the gate lines19in the display area AA in sequence from the gate line19at the uppermost inFIG. 5to the gate line19at the lowermost. The scanning circuit included in the row control circuit28includes a buffer circuit (not illustrated) connected to the gate lines19and configured to amplify the scan signals and to output them to the gate lines19. The row control circuit28may include an auxiliary circuit such as a level-shifter circuit and an ESD protection circuit. The column control circuit27and the row control circuit28are connected to the driver21via connecting lines that are formed on the array substrate11b. The connecting lines are not illustrated.

Next, a wiring layout in a portion of the row control circuit28will be described. As illustrated inFIG. 9, the row control circuit28includes first traces29and second traces30. The second traces30are arranged over the first traces29so as to cross the first traces29. The first traces29are arranged inside the row control circuit28in the non-display area NAA so as to linearly extend in the X-axis direction similar to the gate lines19(seeFIGS. 10 and 11). The first traces29are formed from the first metal film34. The first traces29are parallel to one another (two traces are illustrated inFIG. 9) with a predefined arrangement interval P3away from each other in the Y-axis direction. The second traces30arranged inside the row control circuit28in the non-display area NAA so as to linearly extend in the Y-axis direction similar to the source lines20(seeFIGS. 10 and 11). The second traces30are formed from the second metal film38. The first traces29and the second traces30cross so as to be perpendicular to one another. The second traces30are parallel to one another (five traces are illustrated inFIG. 5) with a predefined arrangement interval P1or P2away from each other in the X-axis direction. The arrangement intervals P1and P2among the second traces30are two different settings. The arrangement interval P1between the second traces30on the left side inFIG. 9is about equal to the arrangement intervals P1among the second traces30on the right side in FIG.9. The arrangement interval P2between the second trace30that is the second from the left edge and the second trace30that is the third from the left edge is wider (or larger) than the arrangement interval P1. The arrangement interval P1between the second traces30, which is narrower (or smaller), is defined close to the arrangement interval P3between the first traces29. A difference between the arrangement intervals P1and P3(|P1−P3|) is smaller than a difference between the arrangement interval P1between the second traces30, which is smaller, and the arrangement interval P2between the second traces30, which is wider (or larger). The second traces30except for the second trace30at the rightmost inFIG. 9cross the first traces29. The second trace30at the rightmost inFIG. 9crosses only the first trace29at the uppermost inFIG. 9.

As illustrated inFIG. 9, crossing portions29aand30aof the first traces29and the second traces30which cross one another are arranged in a matrix with the predefined arrangement intervals P1to P3. Specifically, the crossing portions29aand30aare arranged at the arrangement intervals P1and2similar to the second traces30with respect to the X-axis direction (the direction in which the first traces29extend, the direction in which the second traces30are arranged) and at the arrangement intervals P3similar to the first traces29with respect to the Y-axis direction (the direction in which the second traces30extend, the direction in which the first traces29are arranged). Namely, the crossing portions29aand30aarranged along the X-axis direction are arranged at two different arrangement intervals P1and P2. The crossing portions29aand30aarranged in a matrix are divided into a group including four crossing portions29aand four crossing portions30ain a left area inFIG. 9(hereinafter referred to as a first crossing portion group CG1) and a group including five crossing portions29aand five crossing portions30ain a right area inFIG. 9(hereinafter referred to as a second crossing portion group CG2) with the arrangement interval P2, which is a relatively large. As illustrated inFIGS. 10 and 11, the gate insulating film35and the protective film37are arranged between the crossing portions29aof the first traces29and the crossing portions30aof the second traces30with respect to the Z-axis direction (the direction normal to the plate surface of the array substrate11b) and thus the crossing portions29aare insulated from the crossing portions30a. The first interlayer insulating film39, the organic insulating film40, and the second interlayer insulating film41are layered in this sequence over the second traces30.FIGS. 9 to 11illustrate the wiring layout in portions of the row control circuit28and wiring layouts in other portions of the row control circuit28will be described in detail in the modifications of the first embodiment section that will be provided later.

When the traces29and30are conducting, electrical fields are produced around the crossing portions29aand30aof the first traces29and the second traces30. The portion of the array substrate11bin the non-display area NAA is arranged on the outer side so as to surround the display area AA on the inner side. Therefore, the row control circuit28arranged in the non-display area NAA is more likely to be subject to the moisture that exists outside the row control circuit28in comparison to the display area TFTs17in the display area AA. In the row control circuit28, the organic insulating film40is layered over the second traces30. The organic insulating film40tends to absorb moisture. If the moisture contained in the organic insulating film40is released and the crossing portions29aand30aof the traces29and30are exposed to the moisture, metal ions may be produced around the crossing portions29aand30aof the traces29and30resulting from the moisture. As a result, the metal ions may move under the influence of the electric field, that is, an ion migration (electrochemical migration) may occur. If the ion migration occurs, a short circuit may occur between the crossing portions29aand30a. Especially, the liquid crystal panel11in this embodiment has the narrow frame and thus the non-display area NAA and the area in which the row control circuit28is arranged are narrowed. If the definition is further improved, the distribution density of the traces29and30may increase. Therefore, the ion migration is more likely to occur at the crossing portions29aand30aof the traces29and30.

As illustrated inFIG. 9, the organic insulating film40over the second traces30includes holes31at least in areas that overlap the crossing portions29aand30aof the first traces29and the second traces30. Because such holes31are formed in the organic insulating film40, the organic insulating film40does not overlap the crossing portions29aand30aof the traces29and30in the areas above the crossing portions29aand30a. Even if the organic insulating film40contains moisture and the moisture is released therefrom, the moisture is less likely to reach the crossing portions29aand30aof the traces29and30. Therefore, the ion migrations is less likely to occur at the crossing portions29aand30aof the traces29and30and thus short circuits are less likely to occur among the crossing portions29aand30of the traces29and30. A malfunction of the row control circuit28is less likely to occur, that is, operation reliability improves. This is preferable especially in the liquid crystal panel11with the frame that is narrowed or with the definition that is improved. The holes31may be formed in a step in which the contact holes CH for the display area TFTs17in the display area AA are formed in the organic insulating film40in the production process of the array substrate11b. Specifically, a photo mask used for patterning the organic insulating film40by the photo lithography method in the above process includes different patterns. The patterns include a pattern for exposing or blocking light to portions of the organic insulating film40in which the contact holes CH are to be formed in the display area AA and a pattern for exposing or blocking light to portions of the organic insulating film40in which the holes31are to be formed in the non-display area NAA. Next, the holes31will be described in detail. InFIG. 9, areas in which the holes31are formed, which are viewed in plan (viewed in the direction normal to the plate surface of the array substrate11b), are indicated by two-dashed chain lines.

As illustrated inFIG. 9, the holes31include first holes31A and second holes31B. Each first hole31A is formed in an area that overlaps the first crossing portion group CG1and each second hole31B is formed in an area that overlaps the second crossing portion group CG2. The first crossing portion group CG1and the second crossing portion group CG2includes the crossing portions29aand30a, respectively. The intervals of the crossing portions29aand30awith respect to the X-axis direction are relatively small. Namely, the first hole31A and the second hole31B of the holes31are formed in the areas that cover the crossing portions29aand30aarranged at the intervals P1that are relatively small with respect to the X-axis direction. Among the crossing portions29aand30aarranged at the relatively large interval P2with respect to the X-axis direction, the first hole31A overlaps the crossing portions29aand30athat do not overlap the second hole31B (the crossing portions29aand30aat the second from the left inFIG. 9). Furthermore, the first hole31A overlaps the crossing portions29aand30athat are arranged adjacent to the above crossing portions29aand30awith the relatively small interval P1. Among the crossing portions29aand30aarranged at the relatively large interval P2with respect to the X-axis direction, the second hole31B overlaps the crossing portions29aand30athat do not overlap the first hole31A (the crossing portions29aand30aat the third from the left inFIG. 9). Furthermore, the second hole31B overlaps the crossing portions29aand30athat are arranged adjacent to the above crossing portions29aand30awith the relatively small intervals P1. The organic insulating film40includes a separating portion SP that separates the first hole31A from the second hole31B. The separating portion SP that separates the first hole31A from the second hole31B is arranged between the crossing portions29aand30aarranged at the relatively large interval P2with respect to the X-axis direction. Namely, the organic insulating film40exists between the crossing portions29aand30aarranged at the relatively large interval P2with respect to the X-axis direction. In comparison to a configuration in which all the crossing portions29aand30aare collectively surrounded by edges of a hole, the organic insulating film40is less likely to excessively removed and thus functions of the organic insulating film40for flattening and protecting the traces29and30are less likely to decrease.

Specifically, as illustrated inFIGS. 9 to 11, the first hole31A is formed in an area that includes four crossing portions29aand four crossing portions30aof the first crossing portion group CG1. The edges of the first hole31A collectively surrounds the four crossing portions29aand the four crossing portions30aof the first crossing portion group CG1. When viewed in plan, in areas among the crossing portions29aand30aof the first crossing portion group CG1, the organic insulating film40does not exist. According to the configuration, even if moisture is contained in the organic insulating film40, the moisture is less likely to affect the crossing portions29aand30aof the first crossing portion group CG1. Furthermore, even if a position at which the first hole31A is formed in the organic insulating film40is shifted with respect to the X-axis direction or the Y-axis direction due to a production matter, for example, even if portions of the edges of the first hole31A overlap any of the crossing portions29aand30a, the overlaps are small. Therefore, the ion migration is less likely to occur at the crossing portions29aand30aof the first crossing portion group CG1and the operation reliability of the row control circuit28further improves.

Furthermore, as illustrated inFIGS. 9 to 11, the first hole31A is larger than the area that overlaps the crossing portions29aand30aof the first crossing portion group CG1. Namely, the edges of the first hole31A are arranged outer than the first crossing portion group CG1such that they do not cross (or do not overlap) outer edges of the crossing portions29aand30aof the first crossing portion group CG1in a plan view. In other words, a plan-view area in which the first hole31A is formed is slightly larger than the first crossing portion group CG1and extends outside the first crossing portion group CG1. In comparison to a configuration in which an area in which the first hole is formed is within an area that overlaps the crossing portions29aand30aof the first crossing portion group CG1, distances between the edges of the first hole31A to the respective crossing portions29aand30aof the first crossing portion group CG1are larger. Therefore, the moisture contained in the organic insulating film40is less likely to affect the crossing portions29aand30aof the first crossing portion group CG1. Furthermore, even if a position at which the first hole31A is formed in the organic insulating film40is shifted with respect to the X-axis direction or the Y-axis direction due to a production matter, the misalignment can be compensated. Therefore, the organic insulating film40is less likely to overlap the crossing portions29aand30aof the first crossing portion group CG1and the first hole31A is more likely to be formed in the area that overlaps the crossing portions29aand30aof the first crossing portion group CG1. According to the configuration, the ion migration is less likely to occur at the crossing portions29aand30aof the first crossing portion group CG1and thus the operation reliability of the row control circuit28further improves. The first hole31A has a horizontally-long rectangular shape in a plan view.

Specifically, as illustrated inFIGS. 9 to 11, the second hole31B is formed in an area in which five crossing portions29aand five crossing portions30aof the second crossing portion group CG2are formed. The edges of the second hole31B collectively surround the five crossing portions29aand the five crossing portions30aof the second crossing portion group CG2. When viewed in plan, the organic insulating film40does not exist in areas among the crossing portions29aand30aof the second crossing portion group CG2. Therefore, even if the moisture is contained in the organic insulating film40, the moisture is less likely to affect the crossing portions29aand30aof the second crossing portion group CG2. Furthermore, even if a position at which the second hole31B is formed in the organic insulating film40is shifted with respect to the X-axis direction or the Y-axis direction due to a production matter, for example, even if portions of the edges of the second hole31B overlap any of the crossing portions29aand30a, the overlaps are small. Therefore, the ion migration is less likely to occur at the crossing portions29aand30aof the second crossing portion group CG2and the operation reliability of the row control circuit28further improves.

Furthermore, as illustrated inFIGS. 9 to 11, the second hole31B is larger than the area that overlap the crossing portions29aand30aof the second crossing portion group CG2. Namely, the edges of the second hole31B are arranged outer than the second crossing portion group CG2such that they do not cross (or do not overlap) outer edges of the crossing portions29aand30aof the second crossing portion group CG2in a plan view. In other words, a plan-view area in which the second hole31B is formed is slightly larger than the second crossing portion group CG2and extends outside the second crossing portion group CG2. In comparison to a configuration including an area in which the second hole is formed is within an area that overlaps the crossing portions29aand30aof the second crossing portion group CG2, distances between the edges of the second hole31B to the respective crossing portions29aand30aof the second crossing portion group CG2are larger. Therefore, the moisture contained in the organic insulating film40is less likely to affect the crossing portions29aand30aof the second crossing portion group CG2. Furthermore, even if a position at which the second hole31B is formed in the organic insulating film40is shifted with respect to the X-axis direction or the Y-axis direction due to a production matter, the misalignment can be compensated. Therefore, the organic insulating film40is less likely to overlap the crossing portions29aand30aof the second crossing portion group CG2and the second hole31B is more likely to be formed in the area that overlaps the crossing portions29aand30aof the second crossing portion group CG2. According to the configuration, the ion migration is less likely to occur at the crossing portions29aand30aof the second crossing portion group CG2and thus the operation reliability of the row control circuit28further improves. The second hole31B has a shape that is formed as if a corner of a horizontally-long rectangular portion is cut when viewed in plan.

As illustrated inFIGS. 10 and 11, the protective film37is disposed between the crossing portions30aof the second traces30and the gate insulating film35. Namely, the protective film37is disposed between the first crossing portions29aof the first traces29and the second crossing portions30aof the second traces30in addition to the gate insulating film35. Therefore, short circuits are less likely to occur between the crossing portions29aand30adue to metal ions produced through the ion migration. Furthermore, the first interlayer insulating film39and the second interlayer insulating film41are layered over the crossing portions30aof the second traces30. The crossing portions30aof the second traces30are covered with the first interlayer insulating film39and the second interlayer insulating film41. The first interlayer insulating film39and the second interlayer insulating film41are solid fills formed in areas that overlap the holes31A and31B and areas that do not overlap the holes31A and31B. Therefore, waterproof performance at the crossing portions30aof the second traces30further improves. According to the configuration, the ion migration is less likely to occur at the crossing portions29aand30aof the traces29and30. Therefore, the operation reliability of the row control circuit28further improves.

The gate insulating film35and the protective film37may be electrically connected to each other via contact holes formed in the gate insulating film35and the protective film37the crossing portions29aand30aof the first traces29and the second traces30in portions of the row control circuit28other than those illustrated in figures of this embodiment. Furthermore, the first transparent electrode film23and the second transparent electrode film24may be connected to the crossing portions29aand30athat are connected to each other via contact holes formed in the first interlayer insulating film39and the second interlayer insulating film41so as to communicate with the holes31. According to the configuration, electric charges on the pixel electrodes18formed from the second transparent electrode film24can be released to the common electrode22or the traces29and30.

As described above, the liquid crystal panel (a display device)11according to this embodiment includes the array substrate (a substrate)11b, the row control circuit (a circuit)28, the first traces29, the second traces30, the gate insulating film (an insulating film)35, and the organic insulating film40. The array substrate11bincludes the display area AA and the non-display areas. The display area AA is configured to display images and located on the inner side. The non-display areas NAA are located at the outer periphery and surround the display area AA. The row control circuit28is arranged in the non-display area NAA. The first traces29are included in the row control circuit28. The second traces30are included in the row control circuit28and arranged over the first traces29so as to cross the first traces29. The gate insulating film35is arranged between the first traces29and the second traces30. The organic insulating film40is made of organic resin and arranged over the second traces30. The organic insulating film40includes the holes31formed in the areas that overlap the crossing portions29aand30aof the first traces29and the second traces30.

In the row control circuit28, the first traces29and the second traces that are arranged over the first traces29via the gate insulating film35are arranged so as to cross one another. Therefore, the electric files may be created around the crossing portions29aand30awhen the traces29and30are conducted. On the array substrate11b, the non-display areas NAA are located at the outer periphery and surround the display area AA on the inner side. The row control circuit28arranged in the non-display area AA is more likely to be subject to the moisture at the outside thereof in comparison to the display area AA. In the row control circuit28, the organic insulating film40is arranged over the second traces30. The organic resin that is a material of the organic insulating film40tends to absorb moisture. Therefore, the metal ions may be produced at the crossing portions29aand30aof the traces29and30due to the moisture contained in the organic insulating film40. The metal ions may be attracted by the electric fields and move, that is, so-called ion migration (or electrochemical migration) may occur. In some cases, short circuits may occur among the crossing portions29aand30a. If the frame of the liquid crystal panel11is further narrowed and the non-display areas NAA and the area in which the row control circuit28is arranged are reduced or the definition is further improved, the distribution density of the traces29and30increases. Therefore, the ion migration is more likely to occur at the crossing portions29aand30aof the traces29and30. Because the organic insulating film40includes the holes31formed in the areas that overlap the crossing portions29aand30aof the first traces29and the second traces30, the moisture contained in the organic insulating film40is less likely to affect the crossing portions29aand30aof the traces29and30. Therefore, the ion migration is less likely to occur at the crossing portions29aand30aof the traces29and30and thus the short circuits are less likely to occur among the crossing portions29aand30a. According to the configuration, a malfunction of the row control circuit28is less likely to occur and thus the operation reliability thereof improves. This is preferable for the liquid crystal panel11when the frame thereof is further narrowed or the definition thereof is further improved.

In the organic insulating film40, the area of each hole31is larger than at least the area that overlaps the crossing portions29and30a. In comparison to a configuration in which each hole31is formed in an area that overlaps the crossing portions29aand30aof the traces29and30, distances among the crossing portions29aand30aof the traces29and30are long. Therefore, the moisture contained in the organic insulating film40is less likely to affect the crossing portions29aand30aof the traces29and30. Furthermore, even if a position in which the hole31is formed in the organic insulating film40is shifted due to a production matter, the misalignment can be compensated. Therefore, the organic insulating film40is less likely to overlap the crossing portions29aand30aand the hole31is more likely to be formed in the area that overlaps the crossing portions29aand30aof the traces29and30. According to the configuration, the ion migration is less likely to occur at the crossing portions29aand30aof the traces29and30and thus the operation reliability of the row control circuit28further improves.

At least one of the first trace29and the second trace30includes multiple traces such that the crossing portions29aand30aare arranged at arrangement intervals (intervals) P1to P3. The organic insulating film40includes the holes31each formed in the area over at least some crossing portions29aand30a. Because the opening edges of the hole31collectively surround the crossing portions29aand30aarranged at intervals, the organic insulating film40does not exist between among the crossing portions29aand30a. Therefore, even if the moisture is contained in the organic insulating film40, the moisture is less likely to affect the crossing portions29aand30a. Furthermore, even if the hole31is formed in the organic insulating film40at a shifted position due to a production matter and portions of the opening edges of the hole31overlap the crossing portions29aand30a, the overlaps are small. According to the configuration, the ion migration is less likely to occur at the crossing portions29aand30aof the traces29and30. Therefore, the reliability of the row control circuit28further improves.

At least one of the first trace29and the second trace30includes multiple traces such that at least three crossing portions29aand three crossing portions30aare arranged at different arrangement intervals P1to P3. The organic insulating film40includes the holes31that include the first holes31A and the second holes31B. Each first hole31A is formed in the area over two crossing portions29aand two crossing portions30a, the arrangement interval P1of which is relatively small. The second hole31B is formed in the area that overlap the crossing portions29aand30athat are at the interval P2, which is relatively large, and so as not to overlap the first hole31A. Because the opening edges of the first hole31A in the organic insulating film40collectively surround two crossing portions29aand two crossing portions30athat are at the arrangement interval P1, which is relatively small, the organic film40does not exist among the crossing portions29aand30a. Even if the moisture is contained in the organic insulating film40, the moisture is less likely to affect the crossing portions29aand30athat are at the arrangement interval P1, which is relatively small. Furthermore, even if the hole31is formed in the organic insulating film40at a shifted position due to a production matter and portions of the opening edges of the first hole31A overlap the crossing portions29aand30athat are at the arrangement interval P1, which is relatively small, the overlaps are small. According to the configuration, the ion migration is less likely to occur at the crossing portions29aand30athat are at the arrangement interval P1, which is relatively small. Therefore, the reliability of the row control circuit28further improves. Furthermore, because the organic insulating film40includes the second holes31B each formed in the area that overlap the crossing portions29aand30athat are at the interval P2, which is relatively large, and so as not to overlap the first hole31A, the organic insulating film40exists among the crossing portions29aand30a, the arrangement interval P1of which is relatively large. According to the configuration, the organic insulating film40is less likely to be excessively removed and thus the functions of the organic insulating film40for flattening and protecting the traces29and30are less likely to decrease.

The CF substrate (a counter substrate)11athat is opposed to the array substrate11b, the liquid crystal layer (liquid crystals)11c, and the sealing member11jare included. The liquid crystal layer11cis sandwiched between the array substrate11band the CF substrate11a. The sealing member11jis arranged between the array substrate11band the CF substrate11aso as to surround the liquid crystal layer11cand to seal the liquid crystal layer11c. The row control circuit28is arranged closer to the sealing member11jthan the display area AA. The liquid crystal layer11cthat is sandwiched between the array substrate11band the CF substrate11ais sealed with the sealing member11jthat is arranged between the array substrate11band the CF substrate11aso as to surround the liquid crystal layer11c. Because the row control circuit28is arranged closer to the sealing member11jthan the display area AA, if the moisture passes through the sealing member11j, the row control circuit28is subject to the moisture. As described above, the organic insulating film40includes the holes31each formed in the area that overlaps the crossing portions29aand30aof the first traces29and the second traces30. Therefore, even if the moisture that has passed the sealing member11jis absorbed by the organic insulating film40, the moisture is less likely to affect the crossing portions29aand30aof the traces29and30and thus the ion migration is less likely to occur at the crossing portions29aand30a. According to the configuration, the malfunction of the row control circuit28is less likely to occur.

The first interlayer insulating film39that is arranged between the organic insulating film40and the second traces30and in the area that overlaps at least holes31is included. Because the crossing portions of the second traces30which cross the first traces29are covered with the first interlayer insulating film39. Therefore, waterproof performance (moisture resistance) at the crossing portions30aimproves. According to the configuration, the ion migration is less likely to occur at the crossing portions29aand30aof the traces29and30and thus the operation reliability of the row control circuit28further improves.

The protective film37that is arranged between the second traces30and the gate insulating film35and in the area that overlaps at least the holes31is included. In addition to the gate insulating film35, the protective film37is arranged between the crossing portions29aand30aof the first traces29and the second traces30. Therefore, the short circuits due to the ion migration are further less likely to occur at the crossing portions29aand30aand thus the operation reliability of the row control circuit28further improves.

The first traces29and the second traces30contain at least copper. In comparison to a configuration that contains aluminum, the first traces29and the second traces30that contain copper have higher electric conductivity but they are subject to corrosion due to the moisture. As described earlier, the organic insulating film40includes the holes31in the areas that overlap the crossing portions29aand30aof the first traces29and the second traces30. Therefore, the moisture contained in the organic insulating film40is less likely to affect the crossing portions29aand30aof the traces29and30and thus the ion migration is less likely to occur at the crossing portions29aand30aof the traces29and30. According to the configuration, the operation reliability of the row control circuit28is maintained at a high level while the traces29and30have preferable electric conductivities.

In the display area AA, the display area TFTs (thin film transistors)17that include the semiconductor film36made from the oxide semiconductor are provided. In the row control circuit28, the semiconductor film36is provided between the second traces30and the gate insulating film35. The oxide semiconductor, from which the semiconductor film36is made, has higher electron mobility in comparison to an amorphous semiconductor. Therefore, when circuit components are formed from the semiconductor film36for the row control circuit28, the circuit components can have various functions. This configuration is preferable for adding various functions to the row control circuit28.

The oxide semiconductor contains indium (In), gallium (Ga), zinc (Zn), and oxygen (O). This configuration is preferable for adding various functions to the row control circuit28.

In the above description of the first embodiment, the wiring structure of a portion of the row control circuit28is provided as an example. Other portions of the row control circuit28include wiring structures different from the first embodiment. The wiring structures in the other portions of the row control circuit28will be described in descriptions of first to seventh modifications below. Components of each of the modifications similar to those of the first embodiment will be indicted by the same symbols as the symbols of the components of the first embodiment and may not be described.

First Modification of the First Embodiment

A first modification of the first embodiment will be described with reference toFIG. 12. As illustrated inFIG. 12, the second transparent electrode film24is layered over the first interlayer insulating film39and the second interlayer insulating film41that are layered over the crossing portions30athat cross the first traces29. Namely, the crossing portions30aof the second traces30are covered with the second transparent electrode film24in addition to the first interlayer insulating film39and the second interlayer insulating film41. The second transparent electrode film24is a solid fill formed in areas that overlap the holes31and areas that do not overlap the holes31. Therefore, waterproof performance (moisture resistance) at the crossing portions30aof the second traces30improves. According to the configuration, the ion migration is less likely to occur at the crossing portions29aand30aof the traces29and30and thus the operation reliability of the row control circuit28further improves.

According to the modification as described above, the second transparent electrode film (a transparent electrode film)24that is layered over the organic insulating film40and in the areas that overlap at least the holes31is included. Because the crossing portions29aand30aof the second traces30which cross the first traces29are covered with the second transparent electrode film24in addition to the first interlayer insulating film39, the waterproof performance at the crossing portions29aand30afurther improves. According to the configuration, the ion migration is further less likely to occur at the crossing portions29aand30aof the traces29aand30aand thus the operation reliability of the row control circuit28further improves.

Second Modification of the First Embodiment

A second modification of the first embodiment will be described with reference toFIG. 13. As illustrated inFIG. 13, in the second modification, the first transparent electrode film23is disposed between the first interlayer insulating film39and the second interlayer insulating film41that are layered over the crossing portions30aof the second traces30which cross the first trace29. Namely, the crossing portions30aof the second traces30are covered with the first transparent electrode film23in addition to the first interlayer insulating film39and the second interlayer insulating film41. The first transparent electrode film23is a solid fill that is formed over the areas that overlap the holes31and the areas that do not overlap the holes31. Therefore, the waterproof performance (moisture resistance) at the crossing portions30aof the second traces30improves. According to the configuration, the ion migration is less likely to occur at the crossing portions29aand30aof the traces29and30and thus the operation reliability of the row control circuit28further improves.

According to the modification as described above, the transparent electrode films23and24includes the first transparent electrode film23that is provided in the lower layer and the second transparent electrode film24that is provided in the upper layer. Furthermore, the second interlayer insulating film41that is provided between the first transparent electrode film23and the second transparent electrode film24and formed in the area that overlaps at least the holes31. The crossing portions29aand30aof the second traces30which cross the first traces29are covered with the first transparent electrode film23, the second interlayer insulating film41, and the second transparent electrode film24in addition to the first interlayer insulating film39. Therefore, the waterproof performance at the crossing portions29aand30afurther improves. According to the configuration, the ion migration is further less likely to occur at the crossing portions29aand30aof the traces29and30and thus the operation reliability of the row control circuit28further improves.

Third Modification of the First Embodiment

A third modification of the first embodiment will be described with reference toFIG. 14. As illustrated inFIG. 14, in the third modification, the first transparent electrode film23is provided between the first interlayer insulating film39and the second interlayer insulating film41that are layered over the crossing portions30aof the second traces30which cross the first traces29and the second transparent electrode film24is layered over the second interlayer insulating film41. Namely, the crossing portions30aof the second traces30are covered with the first transparent electrode film23and the second transparent electrode film24in addition to the first interlayer insulating film39and the second interlayer insulating film41. The first transparent electrode film23and the second transparent electrode film24are solid fills formed in the areas that overlap the holes31and in the areas that do not overlap the holes31. Therefore, the waterproof performance (moisture resistance) at the crossing portions30aof the second traces30improves. According to the configuration, the ion migration is less likely to occur at the crossing portions29aand30aof the traces29and30and thus the operation reliability of the row control circuit28further improves.

Fourth Modification of the First Embodiment

A fourth modification of the first embodiment will be described with reference toFIG. 15. As illustrated inFIG. 15, in the fourth modification, the semiconductor film36is provided between the gate insulating film35and the protective film37that are provided between the crossing portions29aand30aof the traces29and30. Namely, the semiconductor film36is provided between the crossing portions29aof the first traces29and the crossing portions30aof the second traces30in addition to the gate insulating film35and the protective film37. According to the configuration, short circuits are less likely to be caused by metal ions due to the ion migration among the crossing portions29aand30aand thus the operation reliability of the row control circuit28further improves. The semiconductor film36is formed in the areas that overlap the holes31and in the areas that do not overlap the holes31.

Fifth Modification of the First Embodiment

A fifth modification of the first embodiment will be described with reference toFIG. 16. As illustrated inFIG. 16, in the fifth modification, the semiconductor film36is provided between the gate insulating film35and the protective film37that are provided between the crossing portions29aand30aof the traces29and30. Furthermore, the second transparent electrode film24is layered over the first interlayer insulating film39and the second interlayer insulating film41that are layered over the crossing portions30aof the second traces30which cross the first trace29. Namely, the semiconductor film36is provided between the crossing portions29aof the first traces29and the crossing portions30aof the second traces30in addition to the gate insulating film35and the protective film37. Furthermore, the crossing portions30aof the second traces30are covered with the second transparent electrode film24in addition to the first insulating film39and the second interlayer insulating film41. With the semiconductor film36, short circuits due to metal ions produced by the ion migration are less likely to occur between the crossing portions29aand30aand thus the operation reliability of the row control circuit28further improves. The semiconductor film36is a solid fill that is arranged over the areas that overlap the holes31and the areas that do not overlap the holes31. Therefore, the waterproof performance (moisture resistance) at the crossing portions30aof the second traces30improves. According to the configuration, the ion migration is less likely to occur at the crossing portions29aand30aof the traces29and30and thus the operation reliability of the row control circuit28further improves.

Sixth Modification of the First Embodiment

A sixth modification of the first embodiment will be described with reference toFIG. 17. As illustrated inFIG. 17, in the sixth embodiment, the semiconductor film36is provided between the gate insulating film35and the protective film37that are provided between the crossing portions29aand30aof the traces29and30. Furthermore, the first transparent electrode film23is provided between the first interlayer insulating film39and the second interlayer insulating film41that are layered over the crossing portions30aof the second traces30which cross the first traces29. Namely, the semiconductor film36is provided between the crossing portions29aof the first traces29and the crossing portions30aof the second traces30in addition to the gate insulating film35and the protective film37. The crossing portions30aof the second traces30are covered with the first transparent electrode film23in addition to the first interlayer insulating film39and the second interlayer insulating film41. With the semiconductor film36, short circuits due to metal ions produced by the ion migration are less likely to occur between the crossing portions29aand30aand thus the operation reliability of the row control circuit28further improves. The semiconductor film36is arranged over the areas that overlap the holes31and the areas that do not overlap the holes31. The first transparent electrode film23is a solid fill that is arranged over the areas that overlap the holes31and the areas that do not overlap the holes31. Therefore, the waterproof performance (moisture resistance) at the crossing portions30aof the second traces30improves. According to the configuration, the ion migration is less likely to occur at the crossing portions29aand30aof the traces29and30and thus the operation reliability of the row control circuit28further improves.

Seventh Modification of the First Embodiment

A seventh modification of the first embodiment will be described with reference toFIG. 18. As illustrated inFIG. 18, in the seventh embodiment, the semiconductor film36is provided between the gate insulating film35and the protective film37that are provided between the crossing portions29aand30aof the traces29and30. Furthermore, the first transparent electrode film23is provided between the first interlayer insulating film39and the second interlayer insulating film41that are layered over the crossing portions30aof the second traces30which cross the first traces29and the second transparent electrode film24is layered over the second interlayer insulating film41. Namely, the semiconductor film36is provided between the crossing portions29aof the first traces29and the crossing portions30aof the second traces30in addition to the gate insulating film35and the protective film37. Furthermore, the crossing portions30aof the second traces30are covered with the first transparent electrode film23and the second transparent electrode film24in addition to the first interlayer insulating film39and the second interlayer insulating film41. With the semiconductor film36, short circuits due to metal ions produced by the ion migration are less likely to occur between the crossing portions29aand30aand thus the operation reliability of the row control circuit28further improves. The semiconductor film36is arranged over the areas that overlap the holes31and the areas that do not overlap the holes31. The first transparent electrode film23and the second electrode film24are solid fills that are arranged over the areas that overlap the holes31and the areas that do not overlap the holes31. Therefore, the waterproof performance (moisture resistance) at the crossing portions30aof the second traces30improves. According to the configuration, the ion migration is less likely to occur at the crossing portions29aand30aof the traces29and30and thus the operation reliability of the row control circuit28further improves.

A second embodiment of the present invention will be described with reference toFIGS. 19 to 21. The second embodiment does not include the protective film37included in the first embodiment. Configurations, functions, and effects similar to those of the first embodiment will not be described.

As illustrated inFIG. 19, an array substrate111baccording to this embodiment does not include the protective film included in the first embodiment (seeFIG. 8) between a semiconductor film136and a second metal film138. In a portion of the array substrate111bin the display area AA, ends of source electrodes117bformed from a second metal film138and included in display area TFTs117and ends of drain electrodes117cformed from the second metal film138and included in the display area TFTs117are directly layered over (without the protective film37) ends of channels117dformed from the semiconductor film136and connected with one another. As illustrated inFIGS. 20 and 21, in portions of the array substrate111bin the non-display areas NAA, only a gate insulating film135is provided between crossing portions129aand130aof first traces129formed from a first metal film134and included in a row control circuit128and second traces130formed from the second metal film138and included in the row control circuit128.

According to the embodiment, a process of patterning of the protective film37by the photolithography method is not required. Therefore, the tact time can be reduced and the production cost can be reduced through simplification of a production facility.FIGS. 19 to 21illustrate wiring configurations in portions of the row control circuit128.

In the above description of the second embodiment, the wiring configurations in portions of the row control circuit128are illustrated as an example. Different wire configurations exist in other portions of the row control circuit128. The wiring configurations in the other portions of the row control circuit128will be described in descriptions of first to seventh modifications below. Components of the modifications similar to those of the second embodiment will be indicated by the symbols same as those of the second embodiment and will not be illustrated or described.

First Modification of the Second Embodiment

A first modification of the second embodiment will be described with reference toFIG. 22. As illustrated inFIG. 22, in the first modification, a second transparent electrode film124is layered over a first interlayer insulating film139and a second interlayer insulating film141that are layered over the crossing portions130aof the second traces130which cross the first traces129. Namely, the crossing portions130aof the second traces130are covered with the second transparent electrode film124in addition to the first interlayer insulating film139and the second interlayer insulating film141. The second transparent electrode film124is a solid fill that is arranged over areas that overlap holes131and areas that do not overlap the holes131. Therefore, the waterproof performance (moisture resistance) at the crossing portions130aof the second traces130improves. According to the configuration, the ion migration is less likely to occur at the crossing portions129aand130aof the traces129and130and thus the operation reliability of the row control circuit128further improves.

Second Modification of the Second Embodiment

A second modification of the second embodiment will be described with reference toFIG. 23. As illustrated inFIG. 23, the first transparent electrode film123is provided between the first interlayer insulating film139and the second interlayer insulating film141that are layered over the crossing portions130aof the second traces130which cross the first traces129. Namely, the crossing portions130aof the second traces130are covered with the first transparent electrode film123in addition to the first interlayer insulating film139and the second interlayer insulating film141. The first transparent electrode film123is a solid fill that is arranged over the areas that overlap the holes131and the areas that do not overlap the holes131. Therefore, the waterproof performance (moisture resistance) at the crossing portions130aof the second traces130improves. According to the configuration, the ion migration is less likely to occur at the crossing portions129aand130aof the traces129and130and thus the operation reliability of the row control circuit128further improves.

Third Modification of the Second Embodiment

A third modification of the second embodiment will be described with reference toFIG. 24. As illustrated inFIG. 24, in the third modification, the first transparent electrode film123is provided between the first interlayer insulating film139and the second interlayer insulating film141that are layered over the crossing portions130aof the second traces130which cross the first traces129. Furthermore, the second transparent electrode film124is layered over the second interlayer insulating film141. Namely, the crossing portions130aof the second traces130are covered with the first transparent electrode film123and the second transparent electrode film124in addition to the first interlayer insulating film139and the second interlayer insulating film141. The first transparent electrode film123and the second transparent electrode film124are solid fills that are arranged over the areas that overlap the holes131and the areas that do not overlap the holes131. Therefore, the waterproof performance (moisture resistance) at the crossing portions130aof the second traces130improves. According to the configuration, the ion migration is less likely to occur at the crossing portions129aand130aof the traces129and130and thus the operation reliability of the row control circuit128further improves.

Fourth Modification of the Second Embodiment

A fourth modification of the second embodiment will be described with reference toFIG. 25. As illustrated inFIG. 25, in the fourth modification, the semiconductor film136is layered over the gate insulating film135that is provided between the crossing portions129aand130aof the traces129and130. Namely, the semiconductor film136is provided between the crossing portions129aof the first traces129and the crossing portions130aof the second traces130in addition to the gate insulating film135. Therefore, short circuits due to metal ions produced by the ion migration are less likely to occur between the crossing portions129aand130aand thus the operation reliability of the row control circuit128further improves. The semiconductor film136is arranged over the areas that overlap the holes131and the areas that do not overlap the holes131.

Fifth Modification of the Second Embodiment

A fifth modification of the second embodiment will be described with reference toFIG. 26. As illustrated inFIG. 26, in the fifth modification, the semiconductor film136is layered over the gate insulating film135that is provided between the crossing portions129aand130aof the traces129and130. Furthermore, the second transparent electrode film124is layered over the first interlayer insulating film139and the second interlayer insulating film141that are layered over the crossing portions130aof the second traces130which cross the first traces129. Namely, the semiconductor film136is provided between the crossing portions129aof the first traces129and the crossing portions130aof the second traces130in addition to the gate insulating film135. Furthermore, the crossing portions130aof the second traces130are covered with the second transparent electrode film124in addition to the first interlayer insulating film139and the second interlayer insulating film141. With the semiconductor film136, short circuits due to metal ions produced by the ion migration are less likely to occur between the crossing portions129aand130aand thus the operation reliability of the row control circuit128further improves. The semiconductor film136is a solid fill that is arranged over the areas that overlap the holes131and the areas that do not overlap the holes131. The second transparent electrode film124is a solid fill that is arranged over the areas that overlap the holes131and the areas that do not overlap the holes131. Therefore, the waterproof performance (moisture resistance) at the crossing portions130aof the second traces130improves. According to the configuration, the ion migration is less likely to occur at the crossing portions129aand130aof the traces129and130and thus the operation reliability of the row control circuit128further improves.

Sixth Modification of the Second Embodiment

A sixth modification of the second embodiment will be described with reference toFIG. 27. As illustrated inFIG. 27, in the sixth modification, the semiconductor film136is layered over the gate insulating film135that is provided between the crossing portions129aand130aof the traces129and130. Furthermore, the first transparent electrode film123is provided between the first interlayer insulating film139and the second interlayer insulating film141that are layered over the crossing portions130aof the second traces130which cross the first traces129. Namely, the semiconductor film136is provided between the crossing portions129aof the first traces129and the crossing portions130aof the second traces130in addition to the gate insulating film135. Furthermore, the crossing portions130aof the second traces130are covered with the first transparent electrode film123in addition to the first interlayer insulating film139and the second interlayer insulating film141. With the semiconductor film136, short circuits due to metal ions produced by the ion migration are less likely to occur between the crossing portions129aand130aand thus the operation reliability of the row control circuit128further improves. The semiconductor film136is a solid fill that is arranged over the areas that overlap the holes131and the areas that do not overlap the holes131. The first transparent electrode film123is a solid fill that is arranged over the areas that overlap the holes131and the areas that do not overlap the holes131. Therefore, the waterproof performance (moisture resistance) at the crossing portions130aof the second traces130improves. According to the configuration, the ion migration is less likely to occur at the crossing portions129aand130aof the traces129and130and thus the operation reliability of the row control circuit128further improves.

Seventh Modification of the Second Embodiment

A seventh modification of the second embodiment will be described with reference toFIG. 28. As illustrated inFIG. 28, in the seventh modification of the second embodiment, the semiconductor film136is layered over the gate insulating film135that is provided between the crossing portions129aand130aof the traces129and130. Furthermore, the first transparent electrode film123is provided between the first interlayer insulating film139and the second interlayer insulating film141that are layered over the crossing portions130aof the second traces130which cross the first traces129and the second transparent electrode film124is layered over the second interlayer insulating film141. Namely, the semiconductor film136is provided between the crossing portions129aof the first traces129and the crossing portions130aof the second traces130in addition to the gate insulating film135. Furthermore, the crossing portions130aof the second traces130are covered with the first transparent electrode film123and the second transparent electrode film124in addition to the first interlayer insulating film139and the second interlayer insulating film141. With the semiconductor film136, short circuits due to metal ions produced by the ion migration are less likely to occur between the crossing portions129aand130aand thus the operation reliability of the row control circuit128further improves. The semiconductor film136is a solid fill that is arranged over the areas that overlap the holes131and the areas that do not overlap the holes131. The first transparent electrode film123and the second transparent electrode film124are solid fills that are arranged over the areas that overlap the holes131and the areas that do not overlap the holes131. Therefore, the waterproof performance (moisture resistance) at the crossing portions130aof the second traces130improves. According to the configuration, the ion migration is less likely to occur at the crossing portions129aand130aof the traces129and130and thus the operation reliability of the row control circuit128further improves.

Third Embodiment

A third embodiment of the present invention will be described with reference toFIG. 29. This embodiment includes holes231formed in areas different from the first embodiment when viewed in plan. Configurations, functions, and effects similar to those of the first embodiment will not be described.

As illustrated inFIG. 29, the areas in which the holes231according to this embodiment are formed are smaller than the areas in which the holes31of the first embodiment are formed when viewed in plan. Specifically, a first hole231A included in the holes231is formed such that opening edges thereof are on outer edges of crossing portions229aand230aincluded in a first crossing portion group CG1when viewed in plan. Namely, the first hole231A is formed in an area that covers multiple (four) crossing portions229aand230aincluded in the first crossing portion group CG1, that is, the opening edges collectively surround the crossing portions229aand230abut the area in which the first hole231A is formed does not extend over areas outside the first crossing portion group CG1. A second hole231B is formed such that opening edges are on outer edges of the crossing portions229aand230aincluded in a second crossing portion group CG2when viewed in plan. Namely, the second hole231G is formed in an area that covers multiple (four) crossing portions229aand230aincluded in the second crossing portion group CG2, that is, the opening edges collectively surround the crossing portions229aand230abut the area in which the second hole231B is formed does not extend over areas outside the second crossing portion group CG2. According to the configuration, the ion migration is properly reduced and thus short circuits are less likely to occur between the crossing portion229aof first traces229and the crossing portions230aof second traces230.

Fourth Embodiment

A fourth embodiment of the present invention will be described with reference toFIG. 30. The fourth embodiment includes holes331formed in areas different from the first embodiment when viewed in plan. Configurations, functions, and effects similar to those of the first embodiment will not be described.

As illustrated inFIG. 30, the areas in which the holes331are formed are larger than the areas in which the holes31of the first embodiment are formed. Specifically, each of the holes331is formed in the area that covers crossing portions329aand330aincluded in a first crossing portion group CG1and crossing portions329aand330aincluded in a second crossing portion group CG2. Opening edges of the hole331collectively surround the crossing portions329aand330aincluded in the first crossing portion group CG1and the crossing portions329aand330aincluded in the second crossing portion group CG2. An interval between the first crossing portion group CG1and the second crossing portion group CG2with respect to the X-axis direction is smaller than the interval P2between the first crossing portion group CG1and the second crossing portion group CG2with respect to the X-axis direction in the first embodiment (seeFIG. 9). According to the configuration, if the organic insulating film remains between the first crossing portion group CG1and the second crossing portion group CG2with respect to the X-axis direction as in the first embodiment (seeFIG. 9), an amount of the remaining organic insulating film is small. Therefore, not only a flattening function and a protecting function of the organic insulating film may not be exerted at proper levels but also moisture from the remaining organic insulating film may be transmitted to the crossing portions329aand330a. Because the hole331is formed in the area that covers the first crossing portion group CG1and the second crossing portion group CG2, the transmission of the moisture from the organic insulating film to the crossing portions329aand330ais properly reduced. According to the configuration, occurrence of the ion migration can be properly reduced and thus short circuits are less likely to occur between the crossing portions329aof first traces329and the crossing portions330aof second traces330.

Fifth Embodiment

A fifth embodiment of the present invention will be described with reference toFIG. 31. This embodiment includes holes431formed in areas different from the first embodiment when viewed in plan. Configurations, functions, and effects similar to those of the first embodiment will not be described.

As illustrated inFIG. 31, the holes431according to this embodiment are provided for every two crossing portions429aand430athat are arranged along the X-axis direction. Specifically, each of the holes431is formed in the area that covers multiple (two) crossing portions429aand430aarranged along the Y-axis direction and the hole431is larger than the crossing portions429aand430a. The hole431at the rightmost inFIG. 31is larger than one crossing portion429aand one crossing portion430a. An organic insulating film includes separating portions SP that separate the holes431adjacent to one another with respect to the X-axis direction. The separating portions SP are arranged among the crossing portions429aand430athat are arranged in the X-axis direction. A relatively small interval P5between the crossing portions429aand430ain the X-axis direction is larger than the relatively small interval P1between the crossing portions29aand30ain the X-axis direction in the first embodiment described earlier (seeFIG. 9). Each hole31of the first embodiment is formed in the area that covers multiple crossing portions29aand30athat are arranged along the X-axis direction. If this embodiment is configured as such, the organic insulating film is excessively removed and thus the flattening function and the protecting function may be degraded. With the separating portions SP, which are portions of the organic insulating film, remaining among the crossing portions429aand430aarranged in the X-axis direction, the flattening function and the protecting function are maintained at proper levels.

Sixth Embodiment

A sixth embodiment of the present invention will be described with reference toFIG. 32. This embodiment includes holes531formed in areas different from the first embodiment when viewed in plan. Configurations, functions, and effects similar to those of the first embodiment will not be described.

As illustrated inFIG. 32, crossing portions529aand530aare arranged along the Y-axis direction and first holes531A and second holes531B of the holes531according to this embodiment are formed every crossing portions529aand530a. Specifically, each first hole531A and each second hole531B are formed in the area that covers multiple (two or three) crossing portions529aand530aarranged along the X-axis direction and are larger than the crossing portions529aand530a. An organic insulating film includes separating portions SP that separate the first holes531A adjacent to one another and the second holes531B adjacent to one another with respect to the Y-axis direction when viewed in plan. The separating portions SP are arranged among the crossing portions529aand530athat are arranged in the Y-axis direction. An interval P6between the crossing portions529aand530ain the Y-axis direction is larger than the interval P3between the crossing portions29aand30ain the Y-axis direction in the first embodiment described earlier (seeFIG. 9). Each hole31of the first embodiment is formed in the area that covers multiple crossing portions29aand30athat are arranged along the Y-axis direction. If this embodiment is configured as such, the organic insulating film is excessively removed and thus the flattening function and the protecting function may be degraded. With the separating portions SP, which are portions of the organic insulating film, remaining among the crossing portions529aand530aarranged in the Y-axis direction, the flattening function and the protecting function are maintained at proper levels.

Seventh Embodiment

A seventh embodiment of the present invention will be described with reference toFIG. 33. This embodiment includes holes631formed in areas different from the first embodiment when viewed in plan. Configurations, functions, and effects similar to those of the first embodiment will not be described.

As illustrated inFIG. 33, crossing portions629aand630aare arranged along the Y-axis direction and the holes631according to this embodiment are formed every crossing portions629aand630a. Furthermore, each of the holes631is formed in the area that covers the crossing portions629aand630aincluded in the first crossing portion group CG1and the crossing portions629aand630aincluded in the second crossing portion group CG2with respect to the X-axis direction. Opening edges of each hole631collectively surround the crossing portions629aand630aincluded in the first crossing portion group CG1and the crossing portions629aand630aincluded in the second crossing portion group CG2. The interval P4between the first crossing portion group CG1and the second crossing portion group CG2with respect to the X-axis direction is equal to the interval P4in the fourth embodiment described earlier (seeFIG. 30). According to the configuration, if the organic insulating film remains between the first crossing portion group CG1and the second crossing portion group CG2with respect to the X-axis direction as in the first embodiment (seeFIG. 9), an amount of the remaining organic insulating film is small. Therefore, not only the flattening function and the protecting function of the organic insulating film may not be exerted at proper levels but also moisture from the remaining organic insulating film may be transmitted to the crossing portions629aand630a. Because the hole631is formed in the area that covers the first crossing portion group CG1and the second crossing portion group CG2, the transmission of the moisture from the organic insulating film to the crossing portions629aand630ais properly reduced. According to the configuration, occurrence of the ion migration can be properly reduced and thus short circuits are less likely to occur between the crossing portions629aof first traces629and the crossing portions630aof second traces630.

Eighth Embodiment

An Eighth embodiment of the present invention will be described with reference toFIG. 34. This embodiment includes holes731formed in areas different from the first embodiment when viewed in plan. Configurations, functions, and effects similar to those of the first embodiment will not be described.

As illustrated inFIG. 34, the holes731according to this embodiment are formed for every crossing portions729aand730athat are arranged along the X-axis direction and Y-axis direction. Specifically, each hole731is larger than an area that overlap the crossing portions729aand730a. Namely, the hole731does not cross over between multiple crossing portions729aand730a. An organic insulating film includes separating portions SP that separate the adjacent holes731from one another with respect to the X-axis direction and the Y-axis direction when viewed in plan. The separating portions SP are arranged among the crossing portions729aand730athat are arranged in the X-axis direction and the Y-axis direction. A relatively small interval P5between the crossing portions729aand730ain the X-axis direction is equal to the interval P5in the fifth embodiment described earlier (seeFIG. 31). An interval P6between the crossing portions729aand730ais equal to the interval P6in the sixth embodiment described earlier (seeFIG. 32). Each hole31of the first embodiment is formed in the area that covers multiple crossing portions29aand30athat are arranged along the X-axis direction and the Y-axis direction. If this embodiment is configured as such, the organic insulating film is excessively removed and thus the flattening function and the protecting function may be degraded. With the separating portions SP, which are portions of the organic insulating film, remaining among the crossing portions729aand730aarranged in the X-axis direction and the Y-axis direction, the flattening function and the protecting function are maintained at proper levels.

Other Embodiments

The present invention is not limited to the embodiments, which have been described using the foregoing descriptions and the drawings. For example, embodiments as described below are also included in the technical scope of the present invention.

(1) The number of the first traces and the second traces and the intervals of the crossing portions (or the first traces or the second traces) with respect to the X-axis direction and the Y-axis direction may be altered from the embodiments described above as appropriate. For example, three or more of the first traces may be arranged along the Y-axis direction or six or more of the second traces or four or less of the second traces may be arranged along the X-axis direction. Furthermore, multiple first traces and only one second trace may be provided or only one first traces and multiple second traces may be provided.

(2) The areas in which the holes are formed when viewed in plan may be altered from the embodiments described above as appropriate. In correspondence with that, the number of the crossing portions inside a single hole (the number of the crossing portions surrounded by the opening edges of the single hole) can be altered as appropriate. For example, each hole may be formed in an area that covers three or more crossing portions arranged in the Y-axis direction or in an area that covers six or more crossing portions arranged in the X-axis direction. The area in which the hole is formed when viewed in plan and the number of the crossing portions within a single hole may be defined with consideration of the intervals of the crossing portions (or the first traces or the second traces).

(3) In each of the above embodiments, the first crossing portion group and the second crossing portion group are adjacent to each other with respect to the X-axis direction. However, the present invention can be applied to a configuration in which three or more first traces are arranged along the Y-axis direction with two different intervals with respect to the Y-axis direction and the first crossing portion group and the second crossing portion group are adjacent to each other with respect to the Y-axis direction. When the configuration of the first embodiment is applied to this configuration, the first hole formed in the area that covers multiple crossing portions included in the first crossing portion group and second hole formed in the area that covers multiple crossing portions included in the second crossing portion group are arranged at a relatively large interval therebetween. Other than that, the configuration in which the first crossing portion group and the second crossing portion group are adjacent to each other with respect to the Y-axis direction may be combined with the configurations of the second to the eighth embodiments as appropriate.

(4) In each of the above embodiments, two crossing portion groups are adjacent to each other with respect to the X-axis direction. The present invention can be applied to a configuration in which three or more first traces and three or more second traces are arranged along the Y-axis direction and the X-axis direction, respectively, with two different intervals with respect to the Y-axis direction and the X-axis direction, two crossing portions are adjacent to each other with respect to the Y-axis direction, two crossing portions are adjacent to each other with respect to the X-axis direction. This configuration may be combined with the configurations of the first to the eighth configurations as appropriate.

(5) In each of the above embodiments, the first interlayer insulating film and the second interlayer insulating film are formed in the areas that overlap at least the holes. However, both or one of the first interlayer insulating film and the second interlayer insulating film may have holes that communicate with the holes in the organic insulating film.

(6) The configurations of the first to the seventh modifications of the first embodiment may be combined with the configurations of the third to the eighth embodiments.

(7) The configurations of the second embodiment and the first to the seventh modifications of the second embodiment may be combined with the configurations of the third to the eighth embodiments.

(8) The configuration of the third embodiment described earlier may be combined with the configurations of the fourth to the eighth embodiments. Especially, when the third embodiment and the eighth embodiment are combined, each hole is formed for every crossing portion and in an area that overlaps each crossing portion.

(9) The wiring structures of the row control circuits arranged on the array substrates in the non-display areas of in the embodiments have been described. Similarly, the present invention can be applied to a wiring structure of the row control circuit arranged on the array substrate in the non-display area. If a circuit other than the row control circuits and the column control circuit is arranged on the array substrate in the non-display area, the present invention can be applied to such a circuit.

(10) The position and the number of the row control circuit(s) on the array substrate may be altered from each of the above embodiments as appropriate. For example, a configuration in which the row control circuit is arranged on the array substrate adjacent to the display area on the right side inFIG. 5and a configuration in which row control circuits are arranged on the array substrate on the right and the left side of the display area may be included in the scope of the present invention.

(11) The materials of the gate insulating film, the protective film, the first interlayer insulating film, the organic insulating film, and the second interlayer insulating film may be altered from the above embodiments as appropriate. The materials of the transparent electrode films may be altered as appropriate. The base material of the array substrate may be altered from the glass substrate to a synthetic resin substrate.

(12) The gate insulating film in each of the above embodiments is a single layered film. However, films made of different materials may be laminated. For example, the gate insulating film may have a laminated structure including a lower gate insulating film made of silicon nitride (SiNx) and an upper gate insulating film made of silicon oxide (SiO2, that is, a laminated structure with a laminating sequence opposite from that of the first interlayer insulating film.

(13) The In—Ga—Zn—O semiconductor is used for the oxide semiconductor to form the semiconductor film in each of the above embodiments. However, other kinds of oxide semiconductors may be used. For example, a Zn—O semiconductor (ZnO), an In—Zn—O semiconductor (IZO (registered trademark)), a Zn—Ti—O semiconductor (ZTO), a Cd—Ge—O semiconductor, a Cd—Pb—O semiconductor, a CdO (cadmium oxide), a Mg—Zn—O semiconductor, an In—Sn—Zn—O semiconductor (e.g., In2O3—SnO2—ZnO), and an In—Ga—Sn—O semiconductor may be included. Amorphous silicon or polysilicon may be used for the semiconductor film as a material thereof other than the oxide semiconductor. When the polysilicon is used, continuous grain silicon (CG silicon) is preferable.

(14) The first metal film and the second metal film in each of the above embodiments are laminated films of titanium (Ti) and copper (Cu). However, instead of titanium, molybdenum (Mo), molybdenum nitride (MoN), titanium nitride (TiN), tungsten (W), niobium (Nb), molybdenum-titanium alloy (MoTi), or molybdenum-tungsten alloy (MoW) may be used. Other than that, a single-layered metal film made of titanium, copper, or aluminum may be used.

(15) In each of the above embodiments, the liquid crystal panel includes the FFS mode as an operation mode. However, a liquid crystal panel including the IPS (in-plane switching) mode or the VA (vertical alignment) mode as an operation mode may be included in the scope of the present invention. If the liquid crystal panel includes the VA mode as an operation mode, a common electrode (a counter electrode) may be formed on the CF substrate rather than the array substrate.

(16) In each of the above embodiments, the display area on the liquid crystal panel is centered with respect to the short-side direction but off-centered with respect to the long-side direction toward one of the ends. However, a liquid crystal panel including a display area that is centered with respect to the long-side direction but off-centered with to the short-side direction toward one of the ends may be included in the scope of the present invention. Furthermore, a liquid crystal panel including a display area that is off-centered with respect to the long-side direction toward one of the ends and off-centered with respect to the short-side direction toward one of the ends may be included in the scope of the present invention. Furthermore, a liquid crystal panel including a display area that is centered with respect to the long-side direction and the short-side direction may be included in the scope of the present invention.

(17) The driver is mounted directly on the array substrate by the COG method in the above embodiments. However, the driver mounted on the flexible printed circuit board connected to the array board through ACF may be included in the scope of the present invention.

(18) In each of the above embodiments, the column control circuit and the row control circuit are arranged on the array board in the non-display area. However, any of the column control circuit and the row control circuit may be omitted and the function thereof may be performed by the driver.

(19) Each of the embodiments includes the liquid crystal panel having a vertically-long rectangular shape. However, the present invention can be applied to a liquid crystal panel having a horizontally-long rectangular shape or a square shape.

(20) A configuration including the liquid crystal panel in each of the above embodiments and a functional panel such as a touch panel or a parallax barrier panel (switch liquid crystal panel) attached to the liquid crystal panel may be included in the scope of the present invention. Furthermore, a configuration including a touch panel pattern directly formed on a liquid crystal panel may be included in the scope of the present invention.

(21) In each of the above embodiments, the backlight device in the liquid crystal display device is the edge-light type. However, a liquid crystal display device including a direct backlight device may be included in the scope of the present invention.

(22) Each of the above embodiments includes the transmissive type liquid crystal display device including the backlight device as an external light source. However, the present invention can be applied to a reflective liquid crystal display device configured to display images using external light. Such a display device does not require a backlight device. Furthermore, the present invention can be applied to a semi-transmissive type liquid crystal display device.

(23) Each of the above embodiments includes the TFTs as switching components of the liquid crystal display device. However, the present invention can be applied to switching components other than the TFTs (e.g., thin film diodes (TFDs)). Furthermore, the present invention can be applied to a liquid crystal display device configured to display black and white images other than the liquid crystal display device configured to display color images.

(24) In each of the above embodiments, the liquid crystal panel is used for the display panel. The present invention can be applied to a display device including other type of display panel (a PDP (plasma display panel) or an organic EL panel). Such a display device may not require the backlight unit.

(25) In each of the above embodiments, the gate electrodes in the display area TFTs branch off from the gate traces and the channels include the extending portions that do not overlap the gate electrodes when viewed in plan. However, the channel may be configured such that entire areas thereof overlap the gate electrodes that branch off from the gate traces.

(26) The above embodiments include the liquid crystal panels that are classified as small sized or small to middle sized panels. Such liquid crystal panels are used in electronic devices including PDAs, mobile phones, laptop computers, digital photo frames, portable video games, and electronic ink papers. However, the present invention can be applied to liquid crystal panels that are classified as middle sized or large sized (or supersized) panels having screen sizes from 20 inches to 90 inches. Such display panels may be used in electronic devices including television devices, electronic signboards (digital signage), and electronic blackboard.

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