Display device

A display device includes a display substrate comprising a plurality of pixels electrically connected to select lines and data lines; first connection pads disposed on an upper surface of the display substrate and electrically connected to the pixels; and second connection pads disposed on a surface of the display substrate that is different from the upper surface and electrically connected to the pixels, wherein the second connection pads are electrically separated from the first connection pads. This allows the area of a surface of a display substrate that can be occupied by a flexible printed circuit board attached thereto to be increased. As a result, the risk of an open-circuit of the wiring can be reduced, and the operational reliability of the device can be improved.

CROSS REFERENCE TO RELATED APPLICATION

This application claims priority from and the benefit of Korean Patent Application No. 10-2018-0069458, filed on Jun. 18, 2018, which is incorporated by reference for all purposes as if fully set forth herein.

BACKGROUND

Field

Exemplary embodiments/implementations of the invention relate generally to a display device and, more specifically, to the present disclosure relates to a display device including connection pads for connecting flexible printed circuit boards on its upper surface and another surface.

Discussion of the Background

Display devices become more and more important as multimedia technology evolves. Accordingly, a variety of display devices such as liquid-crystal display (LCD) devices and organic light-emitting diode display (OLED) devices are currently being developed.

As the resolution of the display device increases, more and more pixels are required in a panel having a limited area. The number of wirings for driving such pixels also increases. As a result, the width of the wirings becomes narrower. If the number of such narrow wirings is increased, the operation reliability of the display device may be affected even by minute impacts or defects. Therefore, what is required is research for improving reliability.

SUMMARY

Devices constructed according to exemplary embodiments of the invention provide a display device with improved operational reliability.

An embodiment of a display device includes a display substrate comprising a plurality of pixels electrically connected to select lines and data lines; first connection pads disposed on an upper surface of the display substrate and electrically connected to the pixels; and second connection pads disposed on a surface of the display substrate that is different from the upper surface and electrically connected to the pixels, wherein the second connection pads are electrically separated from the first connection pads.

An embodiment of a display device includes a display substrate comprising: a plurality of pixels electrically connected to select lines and data lines, wherein first connection pads receiving a first signal for driving the pixels are disposed on a upper surface of the display substrate, and second connection pads receiving a second signal for driving the pixels area disposed on a surface of the display substrate different from the upper surface; a first flexible printed circuit board electrically connected to the first connection pads; and a second flexible printed circuit board electrically connected to the second connection pads, wherein the second flexible printed circuit board is different from the first flexible printed circuit board.

DETAILED DESCRIPTION OF THE EMBODIMENTS

In the following description, a display device refers to a device for providing light, such as a liquid-crystal display device, an organic light-emitting display device, an inorganic light-emitting display device, a plasma display device, etc. for displaying images on a screen using a lighting device or light.

FIG. 1is an exploded, perspective view of a display device according to some exemplary embodiments of the present disclosure.

In the following description, the inventive concepts will be described with an example in which the display device is a liquid-crystal display device including a liquid crystal layer. It is, however, to be understood that the present disclosure is not limited thereto. For example, a display device other than a liquid-crystal display device (for example, an organic light-emitting display device) may be employed, in which case some elements to be described below may be eliminated, or other elements may be added.

The display device according to exemplary embodiments of the present disclosure may be used in a large electronic device such as a television and an electric board, as well as in a small and medium electronic device such as a personal computer, a laptop computer, a vehicle navigation device and a camera, etc. In addition, the display device may be used in a tablet PC, a smart phone, a personal digital assistant (PDA), a portable multimedia player (PMP), a game device, a wristwatch type electronic device, etc. It is to be noted that the above-listed applications are merely examples, and the display device according to exemplary embodiments of the present disclosure may be employed in many other electronic devices.

Referring toFIG. 1, the display device1may include a first display substrate100, a liquid-crystal layer200, and a second display substrate300. In some exemplary embodiments, the display device1may further include a first flexible printed circuit board SFPC1, a second flexible printed circuit board SFPC2, a driving printed circuit board SPCB1, and a backlight unit BLU.

The first display substrate100, the second display substrate300and the backlight unit BLU may have a rectangular shape that has longer sides in a first direction DR1and shorter sides in a second direction DR2perpendicular to the disposed direction DR1. It is, however, to be understood that the shapes of the first display substrate100, the second display substrate300and the backlight unit BLU are not limited thereto. Some portion of the first display substrate100, the second display substrate300and the backlight unit BLU may have curved portions as desired.

The backlight unit BLU may generate light and may provide the generated light to the first display substrate100, the liquid-crystal layer200, and the second display substrate300. The display panel including the first display substrate100, the liquid-crystal layer200and the second display substrate300may generate an image using the light provided from the backlight unit BLU, and may provide it to the outside.

Although not shown in the drawings, a display area in which an image is displayed and a non-display area in which no image is displayed may be defined in the display panel. The non-display area may surround the display area. Although not shown in the drawings, the display device1may further include a window member on the second display substrate300, which covers the display panel and transmits an image to the outside.

The backlight unit BLU may be, for example, an edge-lit backlight unit or a direct-lit backlight unit, but the exemplary embodiments of the present disclosure are not limited thereto.

The first display substrate100may include a plurality of pixels SPX. The plurality of pixels SPX may be defined by, for example, a plurality of gate lines SGL1to SGLm, and a plurality of data lines SDL1to SDLn, where m and n are natural numbers. Specifically, each of the pixels SPX may be defined at the respective intersections of the gate lines SGL1to SGLm and the data lines SDL1to SDLn.

It is, however, to be understood that the exemplary embodiments of the present disclosure are not limited thereto. The plurality of pixels SPX may be electrically connected to the plurality of gate lines SGL1to SGLm and the plurality of data lines SDL1to SDLn, and may be formed at positions other than the intersections of the plurality of gate lines SGL1to SGLm and the plurality of data lines SDL1to SDLn. In some exemplary embodiments, the plurality of gate lines SGL1to SGLm may be select lines for selecting a plurality of pixels SPX.

Although only one pixel SPX is depicted inFIG. 1for convenience of illustration, it is to be understood that a plurality of pixels SPX may be defined on the first display substrate100in practice. In each of the pixels SPX, a pixel electrode defining the pixel may be disposed.

The gate lines SGL1to SGLm and the data lines SDL1to SDLn may be insulated from one another and intersect with one another. The gate lines SGL1to SGLm may be extended in the first direction DR1and may be electrically connected to a gate driver SGD. The data lines SDL1to SDLn may be extended in the second direction DR2and may be connected to a data driver SDD.

The pixels SPX may be electrically connected to the gate lines SGL1to SGLm and the data lines SDL1to SDLn intersecting with each other. The pixels SPX may be arranged, but is not limited to being, in a matrix.

The gate driver SGD may be disposed at a predetermined location adjacent to at least one of the shorter sides of the first display substrate100, for example. It is, however, to be understood that the location of the gate driver SGD is not limited thereto.

For example, the gate driver SGD may be formed during a process of fabricating transistors for driving the pixels SPX and may be mounted on the first display substrate100in the form of an amorphous silicon TFT gate driver circuit (ASG) or an oxide silicon TFT gate driver (OSG).

It is, however, to be understood that the present disclosure is not limited thereto. The gate driver SGD may be formed of a plurality of driving chips, may be mounted on a flexible driving printed circuit board, and may be mounted on the first display substrate100by using tape carrier package (TCP) technique. The gate driver SGD may be formed of a plurality of driving chips and may be mounted on the first display substrate100by using chip-on-glass (COG) technique.

The data driver SDD may include a plurality of first source driver chips SDIC1and a plurality of second source driver chips (e.g., SDIC2ofFIG. 6). The first source driver chips SDIC1may be mounted on the first flexible printed circuit board SFPC1and electrically connected to a predetermined location (for example, an upper surface) adjacent to a longer side of the first display substrate100. In addition, the second source driver chips (e.g., SDIC2ofFIG. 6) may be mounted on the second flexible printed circuit board SFPC2and electrically connected to a predetermined location (for example, a lower surface) adjacent to a longer side of the first display substrate100. Detailed descriptions on this will be given later.

Although the first flexible printed circuit board SFPC1and the second flexible printed circuit board SFPC2are depicted as being connected adjacent to the longer side of the first display substrate100in theFIG. 1, exemplary embodiments of the present disclosure are not limited thereto. The locations at which the first flexible printed circuit board SFPC1and the second flexible printed circuit board SFPC2are connected to the first display substrate100may be modified as desired.

The first flexible printed circuit board SFPC1may be electrically connected to the driving printed circuit board SPCB1, and the second flexible printed circuit board SFPC2may be electrically connected to the driving printed circuit board SPCB1. Accordingly, the first source driver chips SDIC1and the second source driver chips (e.g., SDIC2ofFIG. 6) may also be electrically connected to the driving printed circuit board SPCB1.

In some exemplary embodiments, each of the first flexible printed circuit board SFPC1and the second flexible printed circuit board SFPC2may be provided in the form of a flexible printed circuit board. Specifically, the first flexible printed circuit board SFPC1and the second flexible printed circuit board SFPC2may be implemented in the form of a chip-on-film (COF). Accordingly, the data driver SDD may be connected to the first display substrate100and the driving printed circuit board SPCB1by using tape carrier package (TCP) technology.

The driving printed circuit board SPCB1may include, for example, a timing controller (not shown). The timing controller may be mounted on the driving printed circuit board SPCB1in the form of an integrated circuit chip and electrically connected to the gate driver SGD and the data driver SDD. The timing controller may output a gate control signal, a data control signal, and image data.

The gate driver SGD may receive the gate control signal from the timing controller. The gate driver SGD may generate gate signals in response to the gate control signal and sequentially output the generated gate signals. The gate signals may be applied to the pixels via gate lines SGL1to SGLm row by row. As a result, the pixels SPX can be driven row by row.

The data driver SDD may receive image data and the data control signal from the timing controller. The data driver SDD may generate analog data voltages corresponding to the image data in response to the data control signal, to output them. The data voltages may be provided to the pixels SPX through the data lines SDL1to SDLn.

The pixels SPX may receive data voltages through the data lines SDL1to SDLn in response to the gate signals provided through the gate lines SGL1to SGLm. The pixels SPX may display grayscale corresponding to the data voltages, thereby controlling the transmittance of the region in which each pixel SPX is disposed.

The second display substrate300may be disposed above the first display substrate100. Specifically, the second display substrate300may be spaced apart from the first display substrate100in the third direction DR3. The liquid-crystal layer200may be interposed between the second display substrate300and the first display substrate100. A common electrode for applying an electric field to the liquid-crystal layer200together with the pixel electrode of the first display substrate100may be disposed on the second display substrate300. In addition, color filters for producing the colors corresponding to the pixels SPX described above may be disposed.

In some exemplary embodiments, the second display substrate300may expose a portion of the first display substrate100. Specifically, the second display substrate300may expose a portion of a longer side of the first display substrate100to which the first flexible printed circuit board SFPC1and the second flexible printed circuit board SFPC2are connected. First connection wirings115(seeFIG. 3) and first connection pads110(seeFIG. 3) for electrical connection with the first flexible printed circuit board SFPC1may be disposed on the upper surface of the first display substrate100exposed by the second display substrate300. In addition, second connection pads120(seeFIG. 3) for electrical connection with the second flexible printed circuit board SFPC2may be disposed on the lower surface of the first display substrate100. The second connection wirings125(seeFIG. 3) may be extended from the upper surface to the lower surface of the first display substrate100along the side surface, and may be connected to the second connection pads120(seeFIG. 3). Detailed descriptions on this will be given later.

Although not shown in the drawings, an optical sheet (not shown) including a polarizing sheet may be disposed between the backlight unit BLU and the first display substrate100. Such an optical sheet may control the characteristics of light provided from the backlight unit BLU so that the transmittance of light passing through the display panel is effectively controlled. In addition, although not shown in the drawings, the display device1may further include a housing member (not shown) for accommodating the backlight unit BLU and the display panel.

FIG. 2is an enlarged, perspective view of area A shown inFIG. 1.FIG. 3is a view showing the first display substrate ofFIG. 2.FIG. 4is a development view of the first display substrate ofFIG. 2.FIG. 5is a cross-sectional view taken along line V-V′ ofFIG. 2.FIG. 6is a view showing a display device according to some exemplary embodiments of the present disclosure with elements connected.

Referring toFIGS. 2 to 6, in the first display substrate100, first connection wirings115, first connection pads110, second connection wirings125and second connection pads120may be disposed in regions where the first flexible printed circuit board SFPC1and the second flexible printed circuit board SFPC2are fixed.

The first connection pads110and the first connection wirings115may be disposed on the upper surface UPS of the first display substrate100, as shown in the drawings. Specifically, the first connection wirings115may be electrically connected to some data lines SDLr, SDL(r+2) and SDL(r+4) among the plurality of data lines SDLr to SDL(r+4), where r is a natural number. The gate line SGLr is disposed such that it intersects the plurality of data lines SDLr to SDL(r+4), and the plurality of pixels CPXr to CPX(r+4) may be electrically connected to the gate line SGLr.

Although only three first connection wirings115and two second connection wirings125are shown inFIGS. 2 and 3, this is for the sake of easy understanding. In practice, the number of the first and second connection wirings115and125electrically connected to the plurality of data lines SDLr to SDL(r+4) may be less or more than three.

The data lines SDLr, SDL(r+2) and SDL(r+4) may be electrically connected to the pixels CPXr, CPX(r+2) and CPX(r+4). Accordingly, the first connection wirings115may be electrically connected to the pixels CPXr, CPX(r+2), and CPX(r+4).

The first connection pads110may be extended from the first connection wirings115may be disposed on the upper surface UPS of the first display substrate100. Accordingly, the first connection pads110may be electrically connected to the pixels CPXr, CPX(r+2) and CPX(r+4) through the first connection wirings115.

Although the first connection pads110are shown as being electrically connected to the pixels CPXr, CPX(r+2) and CPX(r+4) through the first connection wirings115in the drawings, the first connection wirings115may be eliminated as desired. Then, the first connection pads110may be electrically connected directly to the data lines SDLr, SDL(r+2) and SDL(r+4) without passing through the first connection wirings115.

As illustrated inFIG. 4, the width W1of the first connection pads110may be greater than the width W2of the first connection wirings115. As such, by enlarging the first connection pads110, connection reliability with the first flexible printed circuit board SFPC1can be improved.

The first connection pads110may be electrically connected to contact pads CP1of the first flexible printed circuit board SFPC1. Specifically, referring toFIG. 5, the first connection pads110may be electrically connected to the contact pads CP1of the first flexible printed circuit board SFPC1by outer lead bonding (OLB) using a first adhesive film PF1.

In some exemplary embodiments, the first adhesive film PF1may include an anisotropic conductive film (ACF). When the first adhesive film PF1is an anisotropic conductive film, the first adhesive film PF1may have conductivity only in a region where the first connection pads110and the contact pads CP1of the first flexible printed circuit board SFPC1are in contact with each other, thereby electrically connecting the first connection pads110with the contact pads CP1of the first flexible printed circuit board SFPC1.

The first source driver chips SDIC1mounted on the first flexible printed circuit board SFPC1, respectively, may generate data voltages for driving the pixels CPXr, CPX(r+2) and CPX(r+4) electrically connected thereto through the first connection pads110. The data voltages thus generated may be transferred to the data lines SDLr, SDL(r+2) and SDL(r+4) through the first connection pads110, respectively.

The second connection wirings125may be extended from the upper surface UPS to the side surface SIS of the first display substrate100as shown in the drawings. In some exemplary embodiments, the second connection wirings125may be extended from the upper surface UPS of the first display substrate100to the lower surface UDS of the first display substrate100along the side surface SIS.

Each of the second connection wirings125may pass between the first connection pads110, as shown in the drawings. Specifically, on the upper surface UPS of the first display substrate100, the second connection wirings125may be extended in parallel to the first connection wirings115and may be extended to the side surface SIS of the first display substrate100by passing between the first connection pads110.

The width W4of the second connection wirings125may be less than the width W1of the first connection pads110.

The second connection wirings125may be electrically connected to some data lines SDL(r+1) and SDL(r+3) among the data lines SDLr to SDL(r+4). The data lines SDL(r+1) and SDL(r+3) may be electrically connected to the pixels CPX(r+1) and CPX(r+3). Accordingly, the second connection wirings125may be electrically connected to the pixels CPX(r+1) and CPX(r+3).

The second connection pads120may be disposed on the lower surface UDS of the first display substrate100. Specifically, the second connection pads120may be extended from the second connection wirings125and may be disposed on the lower surface UDS of the first display substrate100. Accordingly, the second connection pads120may be electrically connected to the pixels CPX(r+1) and CPX(r+3) through the second connection wirings125.

As illustrated inFIG. 4, the width W3of the second connection pads120may be greater than the width W4of the second connection wirings125. As such, by enlarging the second connection pads120, connection reliability with the second flexible printed circuit board SFPC2can be improved.

The second connection pads120may be electrically connected to contact pads CP2of the second flexible printed circuit board SFPC2. Specifically, referring toFIG. 5, the second connection pads120may be electrically connected to the contact pads CP2of the second flexible printed circuit board SFPC2by outer lead bonding (OLB) using a second adhesive film PF2.

In some exemplary embodiments, the second adhesive film PF2may include an anisotropic conductive film (ACF). When the second adhesive film PF2is an anisotropic conductive film, the second adhesive film PF2may have conductivity only in regions where the second connection pads120and the contact pads CP2of the first flexible printed circuit board SFPC2are in contact with each other, thereby electrically connecting the second connection pads120with the contact pads CP2of the first flexible printed circuit board SFPC2.

In some exemplary embodiments, the first flexible printed circuit board SFPC1and the second flexible printed circuit board SFPC2may be substantially the same flexible printed circuit board except their different orientations. In other words, the second flexible printed circuit board SFPC2may be implemented by turning over the first flexible printed circuit board SFPC1.

The second source driver chips SDIC2mounted on the second flexible printed circuit board SFPC2, respectively, may generate data voltages for driving the pixels CPX(r+1) and CPX(r+3) electrically connected thereto through the second connection pads120. The data voltages thus generated may be transferred to the data lines SDL(r+1) and SDL(r+3) through the second connection pads120.

The driving printed circuit board SPCB1may be electrically connected to the first flexible printed circuit board SFPC1and the second flexible printed circuit board SFPC2.

For example, as shown inFIG. 6, the driving printed circuit board SPCB1may be accommodated below the first display substrate100as the first flexible printed circuit board SFPC1and the second flexible printed circuit board SFPC2are bent.

Then, contact pads CP3disposed on the first surface SF1of the driving printed circuit boards SPCB1may be electrically connected to the second flexible printed circuit board SFPC2, and contact pads CP4disposed on the second surface SF2of the driving printed circuit boards SPCB1may be connected to the first flexible printed circuit board SFPC1. In other words, the driving printed circuit board SPCB1may be electrically connected to the first and second flexible printed circuit board SFPC1and SFPC2using the contact pads CP3and CP4disposed on opposite surfaces of the driving printed circuit board SPCB1.

As shown inFIG. 6, in the course of bending the first flexible printed circuit board SFPC1and the second flexible printed circuit board SFPC2, the first source driver chip SDIC1mounted on the first flexible printed circuit board SFPC1may face the second source driver chip SDIC2mounted on the second flexible printed circuit board SFPC2.

Although the first and second connection wirings115and125are electrically connected to the data lines SDLr to SDL(r+4) in the foregoing description, this is merely illustrative. In other implementations, the first and second connection wirings115and125and the first and second connection pads110and120may be arranged in similar shapes so that they may be electrically connected to the plurality of gate lines SGL1to SGLm ofFIG. 1or the other wirings of the first display substrate100.

FIGS. 7 and 8are views for illustrating effects achieved by the display device according to some exemplary embodiments of the present disclosure.

First,FIG. 7shows a comparative display device99which is different from the above-described display device in the layout of connection wirings and connection pads.

Specifically, referring toFIG. 7, first connection pads910and second connection pads920of the display device99are all disposed on the upper surface UPS of a first display substrate900. Accordingly, the space occupied by a first flexible printed circuit board (not shown) electrically connected to the first connection pads910is limited to a first area S2, and the space occupied by a second flexible printed circuit board (not shown) electrically connected to the second connection pads920is limited to a second area S1.

That is to say, the limited area of the upper surface UPS of the first display substrate900is shared by the first flexible printed circuit board (not shown) and the second flexible printed circuit board attached to the first display substrate900. Accordingly, when the first flexible printed circuit board (not shown) is attached to the first connection pads910or the second flexible printed circuit board (not shown) is attached to the second connection pads920, the flexible printed circuit boards may fail to be properly seated on the connection pads910and920. If the flexible printed circuit boards are not properly seated on the connection pads910and920, there may be an open-circuit in the wirings, such that driving signals to be transmitted from the source driving chip to the data lines may not be properly transmitted. That is to say, the operational reliability of the display device may be deteriorated. In this comparative embodiment, the areas of side surface SIS and the lower surface UDS of the first display substrate are not used for the electrical connections.

In contrast, referring toFIG. 8, in the display device1according to the inventive concepts, the first connection pads110are disposed on the upper surface UPS of the first display substrate100while the second connection pads120are disposed on the lower surface UDS of the first display substrate100, thereby increasing the area that can be occupied by the flexible printed circuit boards (not shown).

Specifically, the space that can be occupied by the first flexible printed circuit board (not shown) electrically connected to the first connection pads110is increased up to a third area S2awhich is greater than the first area S2(seeFIG. 7), and the space that can be occupied by the second flexible printed circuit board (not shown) electrically connected to the second connection pads120is increased up to a fourth area S1awhich is greater than the second area S1(seeFIG. 7). As a result, in the process of attaching the flexible printed circuit boards (not shown) to the first display substrate100, the risk of open-circuit of the wirings can be reduced, so that the operational reliability of the display device can be improved.

FIG. 9is a view showing a first display substrate of a display device according to another exemplary embodiment of the present disclosure. In the following descriptions, differences from the above exemplary embodiments will be described, and the redundant description will be omitted.

Referring toFIG. 9, second connection pads520of a display device2according to this exemplary embodiment may be disposed on a side surface SIS rather than a lower surface UDS of a first display substrate500. Specifically, first connection pads510of the display device2may be extended from first connection wirings515and disposed on the upper surface UPS of the first display substrate500, while the second connection pads520may be extended from the second connection wirings525and disposed on the side surface SIS of the first display substrate500. The second connection wirings525may be extended from the upper surface UPS of the first display substrate500to the side surface SIS and may pass between the first connection pads510disposed on the upper surface UPS of the first display substrate500.

As the arrangement of the second connection pads520is changed as described above, the flexible printed circuit boards may be electrically connected to the first and second connection pads510and520differently, and the driving printed circuit board may be electrically connected to the flexible printed circuit boards differently. Such differences will be described below with reference toFIGS. 10 and 11.

FIG. 10is a view showing a way of coupling a first display substrate with flexible printed circuit boards of a display device according to some other exemplary embodiments of the present disclosure.FIG. 11is a view showing a display device according to some other exemplary embodiments of the present disclosure when it is assembled.

Referring toFIGS. 10 and 11, the first flexible printed circuit board SFPC3may be extended in the second direction DR2and may be electrically connected to the first connection pads510, and the second flexible printed circuit board SFPC4may be extended in the third direction DR3and may be electrically connected to the second connection pads520.

For example, as shown inFIG. 11, the driving printed circuit board SPCB2may be accommodated below the first display substrate500as the first flexible printed circuit board SFPC3and the second flexible printed circuit board SFPC4are bent.

It is to be noted that contact pads CP5and CP6used for electrically connecting the driving printed circuit board SPCB2with the first and second flexible printed circuit boards SFPC3and SFPC4may be disposed on the same surface of the driving printed circuit board SPCB2, unlike the above-described exemplary embodiment.

Then, a first contact pad CP5disposed on the lower surface of the driving printed circuit boards SPCB2may be electrically connected to the second flexible printed circuit boards SFPC4, and a second contact pad CP6disposed on the lower surface of the driving printed circuit boards SPCB2may be connected to the first flexible printed circuit boards SFPC3. In other words, the driving printed circuit board SPCB2may be electrically connected to the first and second flexible printed circuit boards SFPC1and SFPC2using the contact pads CP5and CP6disposed on same surface of the driving printed circuit board SPCB2.

According to this exemplary embodiment, the first flexible printed circuit board SFPC3and the second flexible printed circuit board SFPC4may have different shapes. Specifically, the first flexible printed circuit board SFPC3and the second flexible printed circuit board SFPC4may be different kinds of flexible printed circuit boards having different lengths. More specifically, the length L1of the first flexible printed circuit board SFPC3electrically connecting the first connection pads510with the driving printed circuit board SPCB2may be greater than the length L2of the second flexible printed circuit board SFPC4electrically connecting the second connection pads520with the driving printed circuit board SPCB2.

Additionally, as shown inFIG. 11, in the course of bending the first flexible printed circuit board SFPC3and the second flexible printed circuit board SFPC4, the first source driver chip SDIC1mounted on the first flexible printed circuit board SFPC3may not face the second source driver chip SDIC2mounted on the second flexible printed circuit board SFPC4but may face in the same direction.

Some of the advantages that may be achieved by exemplary implementations and embodiments of the invention include allowing the area of a surface of a display substrate that can be occupied by a flexible printed circuit board attached thereto to be increased. As a result, the risk of an open-circuit of the wiring can be reduced, and the operational reliability of the device can be improved.