Abstract:
A liquid crystal display includes: a display with an array substrate having scanning and data lines and an IC chip driving liquid crystal, and a color filter substrate; a light-detector having an optical sensor integrated in the display detecting external light; a detection circuit connected via sensor laid-around lines connecting to light-detector lines; an illuminator illuminating the display panel; and a controller controlling the illuminator based on the detection circuit&#39;s output. The data lines are distributed to the chip-mounting area and have terminals at an end for connecting to IC chip bump terminals. Leader lines distribute from the terminals toward the chip-mounting area and have inspection terminals at their ends. Sensor inspection lines connect at one end to the sensor laid-around lines and extend at the other end to the chip-mounting area. Sensor detection terminals are formed at the other end of the sensor inspection lines.

Description:
BACKGROUND 
       [0001]    1. Technical Field 
         [0002]    The present invention relates to a liquid crystal display apparatus. More specifically, the invention relates to a liquid crystal display apparatus which includes a light-detecting unit that senses an environmental light, controls the brightness of an illuminating unit automatically according to the intensity of the environmental light detected by the light-detecting unit, and achieves an easy inspection of optical-sensor characteristics. 
         [0003]    2. Related Art 
         [0004]    Application of liquid crystal display apparatuses is rapidly spread not only in recent information communication apparatuses, but also in general electric apparatuses. Since a liquid crystal display panel does not emit light by itself, a transmissive liquid crystal display apparatus having a backlight as an illuminating unit combined thereto is used in most cases. However, in the liquid crystal display apparatuses as described above, specifically, in the case of the liquid crystal display apparatuses that are used in compact mobile information terminals represented by mobile phones or the like, reflective liquid crystal display apparatuses which do not require the backlight are used in most cases in order to reduce power consumption. However, since an environmental light is used as the illuminating unit in the reflective liquid crystal display apparatus, visibility is deteriorated in a dark room or the like. Therefore, reflective liquid crystal display apparatuses using a front light as the illuminating unit and transflective liquid crystal display apparatuses which have both transmissivity and reflexivity are being developed. 
         [0005]    The transflective liquid crystal display apparatus is able to display an image using a transmissive portion of a pixel area by illuminating the backlight as the illuminating unit in a dark place and display the image using the environmental light by a reflective portion without illuminating the backlight or the like in a bright place. Therefore, in the transflective liquid crystal display apparatus, constant illumination of the illuminating unit such as the backlight is not necessary, and hence an advantage of significant reduction of the power consumption is achieved. 
         [0006]    The transmissive liquid crystal display apparatus is characterized in that the image can be recognized clearly even when the brightness of the backlight is reduced in the dark place, while the image cannot be viewed easily unless the brightness of the backlight is increased in the bright place. 
         [0007]    As described above, the liquid crystal displays of the liquid crystal display apparatuses have different visibilities depending on the intensity of the environmental light. Therefore, the invention in which a light detector is provided in the liquid crystal display apparatus to detect the brightness of the environmental light thereby, and control the brightness of the illuminating unit on the basis of a result detected by the light detectors is known (see JP-A-2005-203783). 
         [0008]    According to the display apparatus disclosed in JP-A-2005-203783, by the provision of optical sensors in the display apparatus, control of the illuminating unit on the basis of outputs from the optical sensors is achieved. In the display apparatus described above, the optical sensors are formed on, for example, a peripheral area on a liquid crystal display panel assembly (array substrate). Lines used for the optical sensors arranged in the peripheral area are laid around in different areas since input/output signals are completely different from lines provided for driving the liquid crystal. However, the lines laid around the different area from the lines for driving the liquid crystal also have a possibility of defective wirings such as a disconnection or a short-circuit with other lines which are present in the vicinity thereof as in the case of the lines for driving the liquid crystal, an inspection is needed in the course of manufacture. 
         [0009]    The applicant of the invention proposes a liquid crystal display panel which is disclosed in JP-A-2006-215302 in order to improve the workability of the inspection of the lines in the course of manufacture, that is, an intermediate functional inspection. The liquid crystal display panel in this disclosure is adapted to allow the intermediate functional inspection to be carried out by extending leader lines from various lines connected to an IC chip, for example, from ends of data lines, forming terminals for inspection at ends of the leader lines, and forming the terminals for inspection at a predetermined matrix, thereby bringing inspection probes formed of a pin or conductive rubber into contact with the terminals for inspection. However, in the liquid crystal display panel in which the workability is improved, when the optical sensor provided in the display apparatus disclosed in JP-A-2005-203783 is provided, the various lines for driving the liquid crystal and the lines connected to the optical sensors are laid at different positions, and hence such the intermediate functional inspection for these lines must be carried out in different processes. Therefore, there arises a problem of increase in inspection time and the cost thereof for the intermediate functional inspection. 
       SUMMARY 
       [0010]    An advantage of some aspects of the invention is that there is provided a liquid crystal display apparatus having a light-detecting unit which allows an intermediate functional inspection of not only lines for driving liquid crystal, but also lines connected to the light-detecting unit to be carried out easily. 
         [0011]    A liquid crystal display apparatus in the invention includes: a liquid crystal display panel having an array substrate having a plurality of scanning lines and data lines arranged in a matrix pattern and a chip-mounting area on which an IC chip for driving liquid crystal is provided and a color filter substrate having a color filter layer provided thereon; a light-detecting unit having an optical sensor integrated in the liquid crystal display panel for detecting external light; a detection circuit connected via sensor laid-around lines connected respectively to a plurality of lines of the light-detecting unit; an illuminating unit that illuminates the liquid crystal display panel; and a control unit that controls the brightness of the illuminating unit on the basis of an output from the detection circuit; in which at least the plurality of data lines on the array substrate are distributed to the chip-mounting area and are formed with terminals for bump terminals to be connected to bump terminals of the IC chip at an end thereof, leader lines are further distributed from the plurality of terminals to be connected to the bump terminals toward the chip-mounting area and are formed with inspection terminals at ends thereof, a plurality of sensor inspection lines each connected at one end thereof to each of the plurality of sensor laid-around lines and extended at the other end thereof to the chip-mounting area are formed, and the sensor inspection lines are each formed at the other end thereof with a sensor detection terminal. 
         [0012]    In this configuration, since the sensor laid-around lines connected to the light-detecting unit are extended by the sensor inspection lines to the chip-mounting area, and the sensor inspection terminals are provided at distal ends of the sensor inspection lines, the inspection terminals for the respective lines for driving the liquid crystal and the sensor inspection terminals are provided together at one place, so that the intermediate functional inspection is easily carried out. Therefore, inspection of both the lines for driving the liquid crystal and the lines of the light-detecting unit is achieved in less number of processes by the intermediate functional inspection, and hence an event such that the expensive IC chip is mounted to a defective product is avoided, so that the liquid crystal display apparatus is provided at a high yielding percentage. 
         [0013]    Preferably, the color filter layer formed on the color filter substrate includes a plurality of colors which are provided separately along the data lines, and the plurality of inspection terminals are arranged in a plurality of columns so as to be positioned in different columns by colors corresponding thereto, and the sensor inspection terminals formed at the other ends of the plurality of sensor inspection lines are disposed in the separate columns respectively. 
         [0014]    In this configuration, by disposing the inspection terminals in different columns different by colors, and disposing the sensor inspection lines in different columns, different voltages can be applied easily to the sensor inspection lines in the intermediate functional inspection, so that the liquid crystal display apparatus having a high workability in the intermediate functional inspection is provided. 
         [0015]    Preferably, the optical sensor in the light-detecting unit is a TFT optical sensor formed of a thin film transistor. 
         [0016]    In this configuration, by forming the optical sensor of the light-detecting unit with the TFT, it can be formed simultaneously in the same manufacturing process as that for the TFT used in general as a switch element in the liquid crystal display apparatus, so that reduction of the number of processes is achieved. 
         [0017]    Preferably, a plurality of the TFT optical sensors are provided and include first and second TFT optical sensors which detect lights in different systems. 
         [0018]    In this configuration, by providing the plurality of TFT optical sensors and driving the plurality of TFT as the first and second optical sensors which detect the lights in different systems respectively, accurate detection of an environmental light is achieved and control depending on the visibility of a user is enabled. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0019]    The invention will be described with reference to the accompanying drawings, wherein like numbers reference like elements. 
           [0020]      FIG. 1  is a plan view schematically showing an array substrate viewed through a color filter substrate of a liquid crystal display apparatus according to an embodiment of the invention. 
           [0021]      FIG. 2  is a schematic cross-sectional view taken along the line II-II in  FIG. 1 . 
           [0022]      FIG. 3  is an enlarged cross-sectional view showing a portion III in  FIG. 2  in an enlarged scale. 
           [0023]      FIG. 4  is an equivalent circuit diagram of a light-detecting unit. 
           [0024]      FIG. 5  is an enlarged view of a portion V in a state in which a driver is removed in  FIG. 1 . 
           [0025]      FIG. 6  is a perspective view showing an inspection jig which is to be brought into contact with respective inspection terminals. 
       
    
    
     DESCRIPTION OF EXEMPLARY EMBODIMENTS 
       [0026]    Referring now to the drawings, best mode of the invention will be described. However, the embodiments shown below are intended only to illustrate a liquid crystal display apparatus for embodying a technical idea of the invention, and are not intended to limit the invention to the liquid crystal display apparatus described here, and other modes included in claims are also applicable. 
         [0027]      FIG. 1  is a plan view schematically showing an array substrate viewed through a color filter substrate of a liquid crystal display apparatus according to an embodiment of the invention.  FIG. 2  is a schematic cross-sectional view taken along the line II-II in  FIG. 1 .  FIG. 3  is an enlarged cross-sectional view showing a portion III in  FIG. 2  in an enlarged scale.  FIG. 4  is an equivalent circuit diagram of a light-detecting unit.  FIG. 5  is an enlarged view of a portion V in a state in which a driver is removed in  FIG. 1 .  FIG. 6  is a perspective view showing an inspection jig which is to be brought into contact with respective inspection terminals. 
         [0028]    A liquid crystal display apparatus  1  in an embodiment is, as shown in  FIG. 1 , a transmissive or a transflective liquid crystal display apparatus driven in a TN (Twisted Nematic) mode or a VA (Vertical Alignment) mode, including an array substrate AR having various lines arranged on a transparent plate  10  formed of a rectangular transparent insulating material, for example, a glass plate, and a color filter substrate CF having various lines arranged on a transparent substrate  20  formed of a rectangular transparent insulating material arranged so as to oppose the transparent substrate of the array substrate AR. The transparent plate  10  of the array substrate AR is larger in size than the transparent substrate  20  of the color filter substrate CF so as to form a protruded portion  10 A having a predetermined space when being arranged so as to oppose the transparent substrate  20  of the color filter substrate CF, and a seal member  2  is adhered to outer peripheries of the array substrate AR and the color filter substrate CF, so that liquid crystal LC and a spacer (not shown) for adjusting a cell gap are encapsulated. On outer surfaces of the array substrate AR and the color filter substrate CF, there are provided polarizing plates  3  respectively (see  FIG. 3 ). 
         [0029]    The array substrate AR includes short sides  10   a  and  10   b  and long sides  10   c  and  10   d  respectively opposed to each other, and on the side of one of the short sides  10   b  corresponds to the protruded portion  10 A, and a chip-mounting area CA provided on the protruded portion  10 A (see  FIG. 5 ) is provided with an IC chip Dr for a source driver and a gate driver, and the other short side  10   a  side includes a light-detecting unit LD 1 . On the back side of the array substrate AR, there is provided a backlight (not shown) as an illuminating unit. The backlight is controlled by an eternal control circuit (control unit), not shown, on the basis of an output from the light-detecting unit LD 1 . 
         [0030]    An opposed surface of the array substrate AR, that is, the surface which comes into contact with a liquid crystal LC is provided with a plurality of scanning lines GW extending in the row direction of (lateral direction in  FIG. 1 ) and being arranged at a predetermined distance from each other and a plurality of data lines SW extending in the column direction (vertical direction in  FIG. 1 ) so as to be insulated from the scanning lines GW and being arranged at a predetermined distance from each other. The data lines SW and the scanning lines GW are wired in a matrix pattern, and a switch element which is turned ON by scanning signals from the scanning lines GW and a pixel electrode which receives a supply of video signals from the data lines SW via the switch element are formed in each area surrounded by the scanning lines GW and the data lines SW intersecting to each other. In  FIG. 2 , the scanning lines GW, the data lines SW, the switch element, and the pixel electrode are illustrated collectively as a first structure  11 . 
         [0031]    The areas surrounded by the scanning lines GW and the data lines SW constitute pixels and an area in which the pixels are formed corresponds to a display area DA. A thin film transistor (TFT), for example, is used as the switch element. 
         [0032]    The respective scanning lines GW and the respective data lines SW are extended respectively to the outside of the display area DA, that is, are extended to a frame area, and are connected to gate laid-around lines GL and source laid-around lines SL, respectively. Then, the gate laid-around lines GL and the source laid-around lines SL are laid around a peripheral area out of the display area DA and are connected to the IC chip Dr. In addition, on the outside of the gate laid-around lines GL, a common line Vcom is arranged so as to surround the display area DA. An end of the common line Vcom is connected to the IC chip Dr like the gate laid-around lines GL and the source laid-around lines SL, and the common line Vcom is electrically connected to a common line (not shown) provided on the color filter substrate CF via transfer electrodes Tr provided at corners of the array substrate AR. 
         [0033]    Sensor laid-around lines L 1  to L 3  distributed from first and second TFT optical sensors LS 1  and LS 2  of the light-detecting unit LD 1 , described later, are laid around on the side of one of the long sides  10   d  of the array substrate AR and are connected to terminals T 1  to T 3 . The external control circuit is connected to the respective terminals T 1  to T 3 , and a reference voltage is supplied from the external control circuit to the light-detecting unit LD 1 , so that the output from the light-detecting unit LD 1  is delivered. A configuration of the light-detecting unit LD 1  will be described later in detail. 
         [0034]    An opposed surface of the color filter substrate CF, that is, the surface thereof which comes into contact with the liquid crystal LC is formed with a light-shielding layer  22  (see  FIG. 3 ) so as to cover the scanning lines GW, the data lines SW, the switch element, and the frame area, and the area in the display area DA which is surrounded by the light-shielding layer  22  is formed with a color filter layer  23  (see  FIG. 3 ) of a plurality of colors, that is, R(red), G(green), and B(blue), and a protection film  25  (see  FIG. 3 ) formed of a transparent material so as to cover the color filter layer  23  and other members. A surface of the protection film  25  in the display area DA is provided with a common line (not shown) connected to the common line Vcom via the transfer electrodes Tr. The respective components are collectively illustrated as a second structure  21  in  FIG. 2 . The color filter layer  23  described above is formed into a stripe pattern along the direction of extension of the data lines SW on the array substrate AR by colors. 
         [0035]    Subsequently, referring to  FIG. 3  and  FIG. 4 , the configuration of the light-detecting unit LD 1  will be described. In  FIG. 4 , total six of optical sensors  30   1  to  30   6  are illustrated. However, the number of the optical sensors  30   1  to  30   6  is not limited to six, and may be changed as long as it is two or more. 
         [0036]    The light-detecting unit LD 1  includes the first TFT optical sensor LS 1  and the second TFT optical sensor LS 2  as shown in  FIG. 1  and  FIG. 4 . The first and second TFT optical sensors LS 1  and LS 2  include the plurality of (three in  FIG. 4 ) optical sensors  30   1  to  30   3  and optical sensors  30   4  to  30   6 , respectively. Then the optical sensors  30   1  to  30   3  which constitute the first TFT optical sensor LS 1  and the optical sensors  30   4  to  30   6  which constitute the second TFT optical sensor LS 2  are each arranged in a line adjacently to each other, and the first TFT optical sensor LS 1  and the second TFT optical sensor LS 2  are arranged in parallel to each other. 
         [0037]    A circuit configuration of the plurality of optical sensors  30   1  to  30   6  which constitute the first and second TFT optical sensors LS 1  and LS 2  is such that capacitors C 1  to C 6  are connected in parallel between drain electrodes D P1  to D P6  and the source electrodes S P1  to S P6  respectively, the terminals of the source electrodes S P1  to S P6  and the capacitors C 1  to C 6  on one side are connected to the terminals T 1  and T 2  via the laid-around lines L 1  and L 2 , and the terminals T 1  and T 2  are connected to a first reference voltage Vs (for example, +2V) via switch elements SW 1  and SW 2  as shown in  FIG. 4 . Furthermore, The drain electrodes D P1  to D P6  of the optical sensors  30   1  to  30   6  and the other terminals of the capacitors C 1  to C 6  are connected to the terminal T 3  via the single laid-around line L 3 , and a second reference voltage Vref which supplies a predetermined direct voltage is connected to the terminal T 3 . Output liens are connected to the terminals T 1  and T 2 , and predetermined output voltages S 1  and S 2  are outputted to the output liens. Still further, gate electrodes G P1  to G P6  of the optical sensors  30   1  to  30   6  are connected to a predetermined voltage supply source, not shown, via the laid-around lines, so that a predetermined voltage GV (for example, −10V) is supplied thereto. The terminal T 3  here is connected to the second reference voltage Vref, the invention is not limited thereto, and the terminal T 3  may be grounded, for example. In  FIG. 4 , the configuration in which the optical sensors  30   1  to  30   6  are provided for the respective capacitors C 1  to C 6  has been described. However, the invention is not limited thereto and, for example, a single capacitor of a relatively large capacity may be provided for the first and second TFT optical sensors LS 1  and LS 2 , respectively. 
         [0038]    The output voltage detected in this manner is used in a detection circuit, not shown, for detecting the intensity of an environmental light and, on the basis of the intensity of the detected environmental light, the backlight is controlled by the external control circuit. The detection circuit in this case is configured to convert the voltage into an analogue output voltage by a known sampling hold circuit synchronized with ON and OFF of the switch elements SW 1  and SW 2 , convert the analogue output voltage into a digital voltage by an A/D converter, and calculate in digital. 
         [0039]    A wiring configuration of the optical sensor  30   1  and the optical sensor  30   4  from among the optical sensors  30   1  to  30   6  which constitute the first and second TFT optical sensors LS 1  and LS 2  having the circuit configuration as described above will be described. 
         [0040]    The optical sensor  30   1  which constitutes the first TFT optical sensor LS 1  is formed by forming the gate electrode G P1  first, and forming a gate insulating film  12  formed of a transparent insulating material so as to cover on the gate electrode G P1  as shown in  FIG. 3 . Then, a semiconductor layer  13  which is formed of amorphous silicon or polycrystal silicon and serves as a light-receiving device for the environmental light is formed on the gate insulating film  12 . On the semiconductor layer  13 , the source electrode S P1  is formed so as to be partly superimposed on the semiconductor layer  13  from one side of the semiconductor layer  13 . Simultaneously, the drain electrode D P1  is formed so as to partly be partly superimposed on the semiconductor layer  13  from the other side of the semiconductor layer  13 . Then, a protection insulating film  14  is formed further on the source electrode S P1  and the drain electrode D P1 . Then, an area of the semiconductor layer  13  of the optical sensor  30   1  configured described above where the source electrode S P1  and the drain electrode D P1  are not superimposed forms a channel area  15  which is a light-receiving portion. 
         [0041]    In the optical sensor  30   1 , the light-shielding layer  22  of an area of the color filter substrate CF which opposes the channel area  15  is removed and, instead, only a flattening film  25  is disposed, so that a window portion  24  is formed. Then, since the window portion  24  transmits the environmental light therethrough, light-receiving by the channel area  15  is achieved. Since the periphery of the window portion  24  is light-shielded by the light-shielding layer  22 , the channel area  15  is rarely irradiated with the reflective light from the backlight, so that only the environmental light is received accurately. 
         [0042]    The optical sensor  30   4  which constitutes the second TFT optical sensor LS 2  is formed by forming the gate insulating film  12  formed of the transparent insulating material so as to cover on the gate electrode G P4  as shown in  FIG. 3 . Then, the semiconductor layer  13  which is formed of amorphous silicon or polycrystal silicon and serves as the light-receiving device for the environmental light is formed on the gate insulating film  12 . On the semiconductor layer  13 , the source electrode S P4  is formed so as to be partly superimposed on the semiconductor layer  13  from one side of the semiconductor layer  13 . Simultaneously, the drain electrode D P1  is formed so as to be partly superimposed on the semiconductor layer  13  from the other side of the semiconductor layer  13 . Then, the protection insulating film  14  is formed further on the source electrode S P4  and the drain electrode D P4 . Then, an area of the semiconductor layer  13  of the optical sensor  30   4  configured described above where the source electrode S P4  and the drain electrode D P4  are not superimposed forms the channel area  15  which is the light-receiving portion. 
         [0043]    In the optical sensor  30   4 , a light-shielding layer  22  of an area of the color filter substrate CF which opposes the channel area  15  is removed and, instead, for example, the color filter layer  23  of G(green) and the flattening film  25  are disposed. Then, when the channel area  15  is irradiated with the environmental light via the color filter layer  23 , an output different from the first TFT optical sensor LS 1  is obtained in the second TFT optical sensor LS 2 . The reason why G(green) color is used as the color filter layer  23  as described above is because the visibility of the green is higher than other colors, and the environmental light detected via the color filter layer  23  of G (green) is a result of detection which is close to the visibility of the user. 
         [0044]    The light-detecting unit LD 1  having the configuration as described above applies the constant inverted bias voltage GV (for example, −10V) from a voltage source to the gate electrodes G P1  to G P6  of the optical sensors  30   1  to  30   6  of the first and second TFT optical sensors LS 1  and LS 2  via a terminal T 4  and a laid-around line L 4  to achieve a gate off area. Then, The first reference voltage Vs is connected to one ends of the drain electrodes D P1  to D P6  and the capacitors C 1  to C 6  via the switch elements SW 1  and SW 2 , and, one of the switch element SW 1  and SW 2  is turned ON and a predetermined voltage (for example, +2V) is applied to both ends of the capacitors C 1  to C 3  or the capacitors C 4  to C 6 , and then the switch element SW 1  or SW 2  is turned OFF. Subsequently, when a predetermined time is elapsed, charged voltages of the capacitors C 1  to C 3  or C 4  to C 6  are outputted to output lines to supply the charged voltages to the detection circuit, so that the intensity of the environmental light is detected. 
         [0045]    Referring now to  FIG. 1  to  FIG. 5 , the respective lines wired on the chip-mounting area CA will be described. As shown in  FIG. 1  and  FIG. 5 , the gate laid-around lines GL, the source laid-around lines SL, and the end of the common line Vcom are laid around on one of the long sides of the chip-mounting area CA. Then, the ends of laid-around lines for a flexible printed board (FPC) FL, which are to be connected to the FPC, not shown, are laid around on the other long side opposing the long side on which these lines are laid around. The ends of the lines laid around the respective long sides of the chip-mounting area CA are formed with terminals GB, SB, VB and FB to be connected to bump terminals (not shown) of the IC chip Dr respectively, and the terminals to be connected to the bump terminals are formed so as to be exposed on the surface, thereby being electrically connected to the bump terminals of the IC chip Dr via an anisotropic conductive adhesive agent or the like when the IC chip Dr is mounted on the chip-mounting area CA. In  FIG. 5 , the terminals GB, SB, VB and FB to be connected to the bump terminals are illustrated to be aligned in line along the long side of the chip-mounting area CA. However, they may be disposed in two columns alternately in such a manner that the adjacent terminals to be connected to the bump terminals are positioned on the different columns. 
         [0046]    As described above, the respective lines laid around on the one long side of the chip-mounting area CA are laid around toward preset areas, respectively. More specifically, the source laid-around lines SL are laid around so as to be collected to a source laid-around area SA provided at a center portion on the one long side portion of the chip-mounting area CA, the gate laid-around lines GL are laid around so as to be collected to a gate laid-around area GA provided on both sides of the source laid-around area SA from the left and right, and the common line Vcom is laid around to a common laid-around area VA provided on further outside of the gate laid-around area GA. 
         [0047]    Then, further leader lines are distributed from the terminals for the bump terminal GB, SB, and VB formed at the ends of the lines on the output side, that is, the gate laid-around lines GL, the source laid-around lines SL, and the common line Vcom, and the ends of the leader lines are formed with inspection terminals at a predetermined regularity. Structures of arrangement of the leader lines and the inspection terminals will be described below. 
         [0048]    Source leader lines  40 R,  40 G, and  40 B extend from the terminals SB to be connected to the bump terminals formed respectively at the ends of the plurality of source laid-around lines SL toward the inner side of the chip-mounting area CA. Ends of the source leader lines  40 R,  40 G, and  40 B are formed with source inspection terminals  41 R,  41 G, and  41 B. The lengths of the plurality of source leader lines  40 R,  40 G, and  40 B are different. More specifically, from among the source leader lines  40 R,  40 G, and  40 B, the source leader lines  40 R connected to the data lines SW which send signals to pixels which display R(red) in the display area DA are the longest in comparison with the source leader lines  40 G and  40 B, and the source leader lines  40 B connected to the data lines SW which send signals to pixels which display B(blue) in the display area DA are the shortest in comparison with the source leader lines  40 R and  40 G, and the remaining source leader lines  40 G are formed to be shorter than the source leader lines  40 R and longer than the source leader lines  40 B. In this manner, by varying the lengths of the source leader lines  40 R,  40 G, and  40 B, the source inspection terminals  41 R,  41 G, and  41 B connected to the source leader lines  40 R,  40 G, and  40 B are arranged in three columns in total by the data lines SW which display the pixels of the same color. 
         [0049]    Gate leader lines  45 P and  45 S extend from the terminals GB to be connected to the bump terminals formed respectively at the ends of the plurality of gate laid-around lines GL toward the inner side of the chip-mounting area CA. Ends of the gate leader lines  45 P and  45 S are formed with gate inspection terminals  46 P and  46 S. The lengths of the plurality of gate leader lines  45 P and  45 S are different. More specifically, from among the gate leader lines  45 P and  45 S, the gate leader lines  45 P connected to the odd ordinal numbered scanning lines GW are longer than the gate leader lines  45 S, and in contrast, the gate leader lines  45 S connected to the even ordinal numbered scanning lines GW are formed to be shorter than other gate leader lines  45 P. In this manner, by varying the lengths of the gate leader lines  45 P and  45 S, the gate inspection terminals  46 P and  46 S connected to the gate leader lines  45 P and  45 S are arranged in two columns in total alternately between the odd ordinal numbered lines and the even ordinal numbered lines. 
         [0050]    A common leader line  50  extends from the terminal for the bump terminal VB formed at the end of the common line Vcom toward the inner side of the chip-mounting area CA. An end of the common leader line  50  is formed with a common inspection terminal  51 . The common inspection terminal  51  may be provided at a position which does not hinder the inspection of other terminals. 
         [0051]    In addition to the configuration as described above, the liquid crystal display apparatus  1  in this embodiment is provided with a configuration for performing the intermediate functional inspection of the three laid-around lines L 1  to L 3  extending from the light-detecting unit LD 1  as shown in  FIG. 5 . More specifically, the liquid crystal display apparatus  1  includes three sensor inspection lines  31  to  33  which are connected at one ends thereof to the terminals T 1  to T 3  to which the laid-around lines L 1  to L 3  are connected and are provided respectively at the other ends thereof with sensor inspection terminals  34  to  36 . 
         [0052]    The sensor inspection lines  31  to  33  extend from the terminals T 1  to T 3  toward the chip-mounting area CA, and the ends thereof extend to a sensor inspection line laid-around area PA formed between the source laid-around area SA and the gate laid-around area GA in the chip-mounting area CA. The sensor inspection terminals  34  to  36  provided at the ends of the three sensor inspection lines  31  to  33  are arranged at different positions. In other words, as shown in  FIG. 5 , the sensor inspection terminal  34  which is connected to the source electrodes S P1  to S P3  of the first optical sensor LS 1  via the sensor inspection line  31 , the terminal T 1 , and the laid-around line L 1  is arranged on an extension of the column on which the source inspection terminals  41 R are arranged, the sensor inspection terminal  35  which is connected to the drain electrodes D P1  to D P6  of the first and second optical sensors LS 1  and LS 2  via the sensor inspection line  32 , the terminal T 3 , and the laid-around line L 3  is formed on an extension of the column on which the source inspection terminals  41 G are arranged, and the sensor inspection terminal  36  which is connected to the source electrodes S P4  to S P6  of the second optical sensor LS 2  via the sensor inspection line  33 , the terminal T 2 , and the laid-around line L 2  is arranged on an extension of the column on which the source inspection terminals  41 B are arranged. 
         [0053]    In this manner, by arranging the plurality of sensor inspection terminals  34  to  36  on the same columns as the inspection terminals of other lines (for example, the source leader lines  41 R,  41 G, and  41 B) arranged at different positions, a contact work with an inspection jig  70  (see  FIG. 6 ) can be carried out at the same time during the intermediate functional inspection carried out later. Therefore, the inspection jig  70  used for the intermediate functional inspection of the liquid crystal display apparatus  1  having the configuration as described above and the method of inspection therewith will be described below. In  FIG. 6 , reference numerals of areas which correspond to respective conductive materials are provided so as to make the correspondence of the plurality of conductive materials of the inspection jig  70  to the area in the chip-mounting area CA understandable. 
         [0054]    The inspection jig  70  used in the intermediate functional inspection of the liquid crystal display apparatus  1  in the embodiment is provided with the plurality of conductive materials on an insulative rubber  74  as shown in  FIG. 6 . Then, the intermediate functional inspection is carried out by applying predetermined voltages to the respective inspection terminals via the conductive materials. The conductive materials includes source contact members  71 R,  71 G, and  71 B, gate contact members  72 P and  72 S, and common contact members  73 . 
         [0055]    The source contact members  71 R,  71 G and  71 B are three band-shaped conductive materials arranged in parallel at a predetermined distance from each other. The three source contact members  71 R,  71 G and  71 B are adjusted in position in such a manner that the source contact member  71 R comes into contact with an area  61 R where the source inspection terminals  41 R are arranged in  FIG. 5 , the source contact member  71 G comes into contact with an area  61 G where the source inspection terminals  41 G are arranged in  FIG. 5 , and the source contact member  71 B comes into contact with an area  61 B where the source inspection terminals  41 B are arranged in  FIG. 5 . Then, the longitudinal lengths of the source contact members  71 R,  71 G and  71 B are adjusted so as to cover the sensor inspection line laid-around area PA in addition to the source laid-around area SA, and hence the source contact members  71 R,  71 G and  71 B come into contact also with the sensor inspection terminals  34  to  36 . 
         [0056]    The gate contact members  72 P and  72 S are two each, that is, four band-shaped conductive members in total arranged in parallel at a predetermined distance from each other at positions in the vicinity of the longitudinal both ends of the source contact members  71 R,  71 G, and  71 B. The four gate contact members  72 P and  72 S are adjusted in position in such a manner that the gate contact members  72 P come into contact with an area  62 P where the odd ordinal numbered gate inspection terminals  46 P are arranged in  FIG. 5 , and the gate contact members  72 S come into contact with an area  62 S where the even ordinal numbered gate inspection terminals  46 S are arranged in  FIG. 5 . Furthermore, common contact members  73  are formed of rectangular conductive members disposed at positions in the vicinity of the outer ends of the gate contact members  72 P and  72 S in the longitudinal direction, respectively. 
         [0057]    The intermediate functional inspection of the liquid crystal display apparatus  1  using the inspection jig  70  will be described below. 
         [0058]    The intermediate functional inspection is carried out immediately before mounting the IC chip Dr on the chip-mounting area CA. First of all, the liquid crystal LC is encapsulated between the array substrate AR and the color filter substrate CF which are already formed with the lines and are bonded to each other so as to oppose to each other. Then, the inspection jig  70  is placed on the chip-mounting area CA. When placing the inspection jig  70 , the respective conductive materials of the inspection jig  70  (the source contact members  71 R,  71 G and  71 B, the gate contact members  72 P and  72 S, and the common contact members  73 ) are aligned with the conductive material contact areas ( 61 R,  61 G,  61 B,  61 P,  62 S, and  63 ) in the chip-mounting area CA. By applying the predetermined voltage on the respective conductive materials of the inspection jig  70 , the wiring inspection of the scanning lines GW, the data lines SW, and the common line Vcom is carried out. 
         [0059]    When the inspection is ended, the functional inspection is carried out on the light-detecting unit LD 1 . More specifically, the first and second TFT optical sensors LS 1  and LS 2  are irradiated with a light which is adjusted in advance in a state in which a predetermined voltage, that is, the same voltage as the one supplied from the second reference voltage Vref, for example, is applied to the source contact member  71 G. In this state, first of all, a predetermined voltage, that is, the same voltage as the one supplied from the first reference voltage Vs is applied to the source contact member  71 R for a predetermined period, and the output from the first TFT optical sensor LS 1  after having elapsed the predetermined period is detected. Then, the detected output and a logical value which is obtained in advance are compared, and whether or not the first TFT optical sensor LS 1  is operated as desired is inspected. Subsequently, in the same process as the method of inspection of the first TFT optical sensor LS 1 , the inspection is carried out on the second TFT optical sensor LS 2  by applying a predetermined voltage on the source contact member  71 B and detecting the output from the second TFT optical sensor LS 2 . 
         [0060]    In this manner, in the liquid crystal display apparatus  1  according to the embodiment of the invention, only by changing the voltage to be applied to the source contact members  71 R,  71 G and  71 B, the intermediate functional inspection can be carried out on the light-detecting unit LD 1  without replacing the inspection jig  70  or without changing the position to place during the intermediate functional inspection. Therefore, the process of the intermediate functional inspection can be simplified, and the functional inspection including the light-detecting unit LD 1  can be carried out before mounting the expensive IC chip Dr on the chip-mounting area CA, so that the waste of the IC chip Dr is avoided. 
         [0061]    In the liquid crystal display apparatus  1  according to the embodiment of the invention, the example in which the three laid-around lines L 1  to L 3  are laid around from the light-detecting unit LD 1  has been described. However, the number of the laid-around lines is not limited to three lines, and two or four lines are also applicable. In the embodiment, the three laid-around lines L 1  to L 3  are formed on the same columns as the three types of source inspection terminals  41 R,  41 G, and  41 B respectively. However, when the number of the laid-around lines is changed, they may be formed on the same column as other inspection terminal or, for example, the sensor inspection terminals  34  and  36  may be provided on the same column. In this manner, the positions of arrangement of the sensor inspection terminals may be changed as needed according to the number of the laid-around lines laid around from the light-detecting unit LD 1  and the inspection process. 
         [0062]    In the liquid crystal display apparatus  1  according to the embodiment of the invention, description has been made on the liquid crystal display apparatus  1  driven in the TN mode or the VA mode. However, the invention is not limited thereto, and the invention is also applicable to the liquid crystal display apparatus of an IPS (In-Plane Switching) mode or an FFS (Fringe Field Switching) mode in which the pixel electrodes and the common electrode are both formed on the array substrate AR. The entire disclosure of Japanese Patent Application No. 2008-035955, filed Feb. 18, 2008 is expressly incorporated by reference herein.