JP4541734B2 - Display device - Google Patents

Description

  The present invention relates to a display device.

  As image display devices for personal computers, mobile phones, and other various monitors, liquid crystal display devices have been widely used. One typical liquid crystal display device includes a liquid crystal display panel and a backlight unit disposed on the back surface thereof. The liquid crystal display panel displays an image by controlling the transmitted light from the backlight unit. The liquid crystal display panel has a plurality of image signal lines (source lines) and a plurality of scanning lines (gate lines) arranged in a matrix. In the liquid crystal display panel, a plurality of pixels are formed corresponding to each intersection of an image signal line and a scanning line. The image signal lines are driven by an image signal line driving circuit (source driver IC), and the scanning lines are driven by a scanning line driving circuit (gate driver IC). The image signal line driving circuit and the scanning line driving circuit drive the liquid crystal panel according to the display signal and the control signal from the display control circuit.

  Usually, the scanning line driving circuit and the image signal line driving circuit are connected to the edge of the substrate on two adjacent sides of the liquid crystal display panel. That is, the scanning line driving circuit and the image signal line driving circuit are provided on different sides of the liquid crystal panel.

  In recent years, there has been an increasing demand for liquid crystal display devices with high definition and a narrow frame. Therefore, in the liquid crystal display device, the number of wirings increases and the space for forming the lead wiring from the drive circuit is reduced. As a result, the wiring width of the routing wiring from the drive circuit to the display area is reduced. When the wiring width is narrowed, a difference in wiring resistance is likely to occur due to a difference in wiring length. Due to the difference in wiring resistance, there is a problem in that the amount of distortion in the output waveform from the drive circuit differs for each wiring, resulting in display unevenness. In order to solve the problem of such display unevenness, a liquid crystal display element is disclosed in which the wiring width is corrected outside the seal portion and the wiring resistance due to the difference in wiring length is made uniform (Patent Document 1).

  By the way, the space for arranging the drive circuit may be limited due to the demand for narrowing the frame. That is, since the display area is made larger than the outer shape of the display panel, the width of the frame area becomes narrow, and the space for providing the drive circuit may be limited. This space limitation is particularly severe for small liquid crystal display devices such as mobile phones. For example, in a mobile phone, the width of the frame region in the horizontal direction is severely limited, and the width of the frame region in the vertical direction may not be severe. In this case, there is a possibility that the drive circuit cannot be arranged beside the liquid crystal panel. When the horizontal or vertical space in the display area is limited, there is a possibility that the drive circuit cannot be arranged on two adjacent sides of the liquid crystal panel.

  In order to solve this problem, a liquid crystal display device in which a gate driver IC and a source driver IC are arranged along one side of a liquid crystal panel is disclosed (Patent Document 2). However, in this liquid crystal display device, the drive circuit is arranged at the end of the liquid crystal panel. Therefore, it is necessary to route the wiring from the end on the drive circuit side to the end on the opposite side. There is a problem that the width of the frame region becomes wide and narrowing of the frame is limited.

  In addition, the transmission distance is different for each gate wiring, and the difference in the wiring length of the gate wiring becomes large. A difference in wiring resistance is caused by a difference in wiring length. Therefore, in the conventional liquid crystal display device, the amount of distortion differs in the output waveform from the drive circuit for each wiring, and display unevenness may occur. Therefore, in a narrow frame liquid crystal display panel with a narrow non-display area, there is a problem that display unevenness occurs due to a difference in wiring resistance and display quality is deteriorated.

JP-A-7-101214 JP 2003-202586 A

  As described above, the conventional liquid crystal display device has a problem in that the display quality of the liquid crystal panel with a narrow frame deteriorates.

The present invention has been made in view of such problems, and an object thereof is to provide a display device having a narrow frame area.
Another object of the present invention is to provide a display device having a narrow frame and excellent display quality.

  The display device according to the first aspect of the present invention includes a display area (for example, the display area 10 according to the embodiment of the present invention) and a frame area (for example, implementation of the present invention) arranged around the display area. A display panel (for example, the liquid crystal panel 1 according to the embodiment of the present invention) and a plurality of scanning lines (for example, of the present invention) provided in the display area. A gate line 140) according to the embodiment, a plurality of signal lines (for example, the source line 130 according to the embodiment of the present invention) intersecting the scanning line in the display region, and a scanning voltage applied to the scanning line. For example, a gate driver IC 14 according to an embodiment of the present invention, and a signal line driver circuit for supplying an image voltage to the signal line (for example, a gate according to an embodiment of the present invention). The scanning line driving circuit and the signal line driving circuit are arranged on the same side of the display panel (for example, the lower side of the liquid crystal panel 1 according to the embodiment of the present invention). In the display device, the display region corresponds to a first scanning line group (for example, the gate wiring 140a according to the embodiment of the present invention) that is a part of the plurality of scanning lines. A region (for example, a first region 10a according to an embodiment of the present invention) and a second scanning line group (for example, a part of the plurality of scanning lines and different from the first scanning line group (for example, Corresponding to the gate wiring 140b according to the embodiment of the present invention, a second region (for example, a second region according to the embodiment of the present invention) disposed closer to the scanning line driving circuit than the first region. 2 region 10b) and the display panel A first line that is provided at an end of a side where the signal line driving circuit is disposed and an adjacent side (left side of the liquid crystal panel 1) and connects the scanning line driving circuit and the first scanning line group. A routing wiring group (for example, the routing wiring 141a according to the embodiment of the present invention) and a side facing the side where the first routing wiring group of the display panel is provided (for example, implementation of the present invention) A second routing wiring group (for example, implementation of the present invention) provided at the end of the liquid crystal panel 1 according to the embodiment of the present invention and connecting the scanning line driving circuit and the second scanning line group. And the routing wiring 141b) according to the embodiment. Thereby, a narrow frame can be achieved.

  In the display device according to the second aspect of the present invention, in the above-described display device, the second routing wiring crosses a boundary line between the first region and the second region, and enters the first region. It extends to the corresponding position and is connected to the first scanning line group via a folded portion (for example, the folded portion 19 according to the embodiment of the present invention) formed at a position corresponding to the first region. It is what. Thereby, the wiring resistance difference of the scanning line can be reduced, and the display quality can be improved.

  The display device according to a third aspect of the present invention is the display device described above, wherein the first routing line corresponding to the scanning line adjacent to the boundary line in the first scanning line group, and the second wiring line. In the scanning line group, the second routing wiring corresponding to the scanning line adjacent to the boundary line is formed with substantially the same length. Thereby, the wiring resistance difference of the scanning line can be reduced, and the display quality can be improved.

  The display device according to a fourth aspect of the present invention is the display device described above, wherein the first lead-out wiring corresponding to the scanning line adjacent to the boundary line in the first scanning line group and the second wiring line. The second routing wiring corresponding to the scanning line adjacent to the boundary line in the scanning line group is formed with substantially the same width. Thereby, fluctuations in the wiring resistance of the scanning lines due to fluctuations in side etching can be reduced, and display quality can be improved.

  A display device according to a fifth aspect of the present invention includes a display panel provided with a display area, a frame area arranged around the display area, and a plurality of scanning lines provided in the display area. A plurality of signal lines intersecting with the scanning lines in the display region; a scanning line driving circuit for supplying a scanning voltage to the scanning lines; and a signal line driving circuit for supplying an image voltage to the signal lines. The scanning line driving circuit and the signal line driving circuit are arranged on the same side of the display panel, and the display area is a part of the plurality of signal lines. A first region corresponding to a signal line group and a part of the plurality of signal lines, corresponding to a second signal line group different from the first signal line group, and more than the first region; A second region disposed near the signal line driver circuit, and the table A first routing wiring group that is provided at an end of a side adjacent to the side where the signal line driving circuit of the panel is disposed, and connects the signal line driving circuit and the first signal line group; A second routing wiring group provided at an end of the side opposite to the side where the first routing wiring is provided on the display panel and connecting the signal line driving circuit and the second signal line group. Are provided. Thereby, a narrow frame can be achieved.

  A display device according to a sixth aspect of the present invention is the display device described above, wherein the second routing wiring extends beyond the boundary line between the first region and the second region and enters the first region. It extends to a corresponding position and is connected to the first signal line group via a folded portion formed at a position corresponding to the first region. Thereby, the wiring resistance difference of a signal line can be reduced and display quality can be improved.

  The display device according to a seventh aspect of the present invention is the display device described above, wherein the first routing line corresponding to the signal line adjacent to the boundary line in the first signal line group and the second The second routing wiring corresponding to the signal line adjacent to the boundary line in the signal line group is formed with substantially the same length. Thereby, the wiring resistance difference of a signal line can be reduced and display quality can be improved.

  The display device according to an eighth aspect of the present invention is the display device described above, wherein the first routing wiring corresponding to the signal line adjacent to the boundary line in the first signal line group and the second wiring line are provided. The second routing wiring corresponding to the signal line adjacent to the boundary line in the signal line group is formed with substantially the same width. As a result, variation in wiring resistance of the signal line due to variation in side etching can be reduced, and display quality can be improved.

A display device according to a ninth aspect of the present invention includes a display panel provided with a display area, a frame area arranged around the display area, and a plurality of scanning lines provided in the display area. A plurality of signal lines intersecting with the scanning lines in the display region; a scanning line driving circuit for supplying a scanning voltage to the scanning lines; and a signal line driving circuit for supplying an image voltage to the signal lines. The scanning line driving circuit and the signal line driving circuit are arranged on the same side of the display panel, and the display area is a part of the plurality of scanning lines. A first region corresponding to a scanning line group; and a second region corresponding to a second scanning line group which is a part of the plurality of scanning lines and is different from the first scanning line group. The signal line driving circuit is extended to the side of the display panel where the signal line driving circuit is arranged and the side adjacent thereto. A first routing wiring group connecting the scanning line driving circuit and the first scanning line group; and an end of a side of the display panel opposite to a side where the first routing wiring is provided. A second routing wiring group provided between the scanning line driving circuit and the second scanning line group, intersecting the second routing wiring group via an insulating film, and The crossing electrode (for example, the crossing electrode 15c according to the embodiment of the present invention) that reduces the difference in wiring capacitance between the routing wiring group and the second routing wiring group is provided. As a result, a difference in wiring capacity between scanning lines can be reduced, and a display device with a narrow frame and high display quality can be provided.
In the display device according to the ninth aspect, the first routing wiring group may intersect the signal line in a frame region of the side of the display panel where the signal line driving circuit is disposed.

A display device according to a tenth aspect of the present invention is the display device described above, wherein a display panel provided with a display region and a frame region arranged around the display region is provided in the display region. A plurality of scanning lines, a plurality of signal lines intersecting the scanning lines via an insulating film in the display region, a scanning line driving circuit for supplying a scanning voltage to the scanning lines, and an image on the signal lines. A signal line driving circuit for supplying a voltage, wherein the scanning line driving circuit and the signal line driving circuit are arranged on the same side of the display panel, and the display region includes the plurality of display areas. A first region corresponding to a first signal line group that is a part of the first signal line group, and a second signal line group that is a part of the plurality of signal lines and is different from the first scanning line group. And a second region corresponding to the scanning line driving circuit. A first routing line group extending to the side of the display panel adjacent to the side and connecting the signal line driving circuit and the first signal line group; and the first routing line of the display panel. A second routing wiring group that is provided at an end of the side opposite to the side where the rotating wiring is provided and connects the signal line driving circuit and the second signal line group; and the second routing A crossing electrode is provided which crosses the wiring group via an insulating film and reduces a difference in wiring capacitance between the first routing wiring group and the second routing wiring group. As a result, a difference in wiring capacity between signal lines can be reduced, and a display device with a narrow frame and high display quality can be provided.
In the display device according to the tenth aspect described above, the first routing wiring group may intersect the scanning line in a frame region of the side of the display panel where the scanning line driving circuit is disposed. .

  The display device according to an eleventh aspect of the present invention is the display device described above, wherein the crossing electrode extends a part of a lead wiring connecting a plurality of common wirings arranged between the scanning lines. Is formed. Thereby, the wiring capacitance difference can be easily reduced.

  A display device according to a twelfth aspect of the present invention is the display device described above, wherein the crossing electrode extends a ground wiring for driving the power source of the scanning line driving circuit or the signal line driving circuit. Is formed. Thereby, the wiring capacitance difference can be easily reduced.

  According to the present invention, it is possible to provide a display device having a narrow frame area. Further, according to the present invention, it is possible to provide a display device having a narrow frame and excellent display quality.

  Hereinafter, embodiments to which the present invention can be applied will be described. The following description is to describe the embodiment of the present invention, and the present invention is not limited to the following embodiment. For clarity of explanation, the following description and drawings are omitted and simplified as appropriate. Moreover, those skilled in the art can easily change, add, and convert each element of the following embodiments within the scope of the present invention.

Embodiment 1 of the Invention
A liquid crystal display device according to this embodiment will be described with reference to FIG. FIG. 1 is a diagram schematically showing a liquid crystal panel used in the liquid crystal display device according to the present embodiment. In FIG. 1, 1 is a liquid crystal panel, 8 is an array substrate, 9 is a frame area of the liquid crystal panel, 10 is a display area of the liquid crystal panel, 11 is a control circuit, 13 is a source driver IC, 14 is a gate driver IC, and 16 is a boundary. Reference numeral 17 denotes a substrate end on the source driver IC 13 side, 18 denotes a substrate end on the gate driver IC 14 side, 130 denotes a source wiring, 140 denotes a gate wiring, and 141 denotes a routing wiring.

  The liquid crystal panel 1 typically has a display area 10 composed of a plurality of pixels arranged in a matrix, and a frame area 9 that is an outer peripheral area thereof. That is, the non-display area surrounding the outer periphery of the display area 10 is the frame area 9. The liquid crystal panel 1 has an array substrate 8 on which an array circuit is formed and a counter substrate, and liquid crystal is sealed between the two substrates. In FIG. 1, the counter substrate is not shown. In an active matrix type liquid crystal panel, each pixel includes a switching element for controlling input / output of a display signal. A typical switching element is a TFT (Thin Film Transistor).

  The color liquid crystal display device has an RGB color filter layer on a counter substrate. Each pixel in the display area of the liquid crystal panel 1 displays one of RGB colors. Of course, a black and white display displays either white or black. The array substrate 8 and the counter substrate are formed by forming a predetermined pattern on the transparent glass substrate. A backlight unit is disposed on the back surface of the liquid crystal panel 1.

  A plurality of source lines 130 and a plurality of gate lines 140 are arranged in a matrix on the array substrate 8 in the display area 10. In the display area 10, each of the source lines 130 is formed along the Y direction. A plurality of source wirings 130 formed in the Y direction are arranged side by side in the X direction. In the display area 10, source lines 130 having the same width are formed at the same interval. On the other hand, in the display area 10, each of the gate lines 140 is formed in the X direction. A plurality of gate wirings 140 formed in the Y direction are arranged side by side in the X direction. In the display area 10, gate lines 140 having the same width are formed at the same interval.

  The source wiring 130 and the gate wiring 140 are disposed so as to be substantially perpendicular to each other via an insulating film, and a TFT is disposed in the vicinity of the intersection. Each pixel selected by the gate voltage input from the gate driver IC 14 applies an electric field to the liquid crystal based on the image display signal voltage input from the source driver IC 13. A source driver IC 13 that supplies an image display signal voltage to the source line 130 and a gate driver IC 14 that supplies a gate voltage to the gate line 140 are connected to the frame area 9 of the array substrate 8 provided on the outer periphery of the display area.

  Image data / control signals are input to the control circuit 11 from an external device such as a mobile phone. The control circuit 11 transfers the image data to a frame memory (not shown). A frame memory composed of DRAM, SDRAM, DDR, etc. temporarily stores the transferred image data. The control circuit 11 processes the current image data using the past image data temporarily stored in the frame memory. The processed image data is transmitted to the liquid crystal panel 1.

  In order to operate the source driver IC 13 and the gate driver IC 14, the control circuit 11 outputs image data / control signals to the source driver IC 13 and outputs control signals to the gate driver IC 14. The control circuit 11 is connected to the liquid crystal panel 1 via, for example, an FPC (Flexible Printed Circuit). The gate driver IC 14 converts the control signal into a scanning voltage and outputs it to the gate wiring 140 on the liquid crystal panel 1. Then, the pixel line to which the gradation voltage is applied is selected. The source driver IC 13 converts the image data transferred for the pixels for one horizontal line into a gradation voltage, and outputs it to the source wiring 130 on the liquid crystal panel 1 based on the control signal. By sequentially performing the above operation for each line, a gradation voltage corresponding to the image data for one frame is applied to each pixel of the liquid crystal panel 1, and an image is displayed on the screen of the liquid crystal panel 1. The present invention can also be applied to various types of liquid crystal display devices other than those described above, or other display devices such as organic EL display devices and inorganic EL display devices.

  In the present invention, the gate driver IC 14 and the source driver IC 13 are arranged at the end of the same side of the array substrate 8. That is, the source driver IC 13 and the gate driver IC 14 are arranged in parallel so as to face one side in the X direction of the rectangular display area 10. In other words, the source driver IC 13 and the gate driver IC 14 are concentrated on one side of the array substrate 8. The source driver IC 13 and the gate driver IC 14 are arranged along the X direction and connected at a position facing the display region 10. Output terminals of the source driver IC 13 and the gate driver IC 14 are disposed on the display area 10 side.

  This eliminates the need to place driver ICs on the side adjacent to the side where the source driver IC 13 and the gate driver IC 14 are arranged. That is, it is not necessary to connect the driver IC to the substrate end 17 on the source driver IC 13 side and the substrate end 18 on the gate driver IC 14 side. For this reason, the frame area in the X direction can be narrowed. In the figure, a COG (Chip On Glass) type liquid crystal display device in which the source driver IC 13 and the gate driver IC 14 are mounted on the array substrate 8 is shown. In the case of the COG type, it is directly connected to the end of the array substrate 8 through the ACF. Of course, a liquid crystal display device other than the COG type may be used. For example, when TCP is used, TCP mounted with the source driver IC 13 and TCP mounted with the gate driver IC 14 are connected to one side of the array substrate 8. The source driver IC 13 and the gate driver IC 14 are arranged inside a position corresponding to the display area 10. Thereby, the driver IC is arranged inside the width of the display area 10, and the width of the frame area 9 in the X direction can be narrowed.

  In the following description, the Y direction is the vertical direction, and the X direction is the horizontal direction. In the vertical direction, the substrate end side on which the source driver IC 13 and the gate driver IC 14 are provided is referred to as the lower side, and the side opposite to the substrate end portion on which the source driver IC 13 and the gate driver IC 14 are provided is referred to as the upper side. In the left-right direction, the substrate end 17 side on the source driver IC 13 side is the left side, and the substrate end 18 side on the gate driver IC 14 side is the right side.

  Here, the display area 10 will be described by being divided into a first area 10a and a second area 10b divided by a boundary line 16 indicated by a one-dot chain line. The boundary line 16 is provided in a direction parallel to the X direction. The second area 10b is an area in the vicinity of the gate driver IC 14 and the source driver IC 13 in the display area 10. The first region 10a is a region farther from the gate driver IC 14 and the source driver IC 13 than the second region 10b. In the display area 10, the area above the boundary line 16 is the first area 10 a, and the area below the boundary line 16 is the second area 10 b.

  Of the gate wirings 140 formed in the display area 10, the gate wiring provided in the first area 10a is referred to as a gate wiring 140a. On the other hand, among the gate wirings 140 formed in the display region 10, the gate wiring provided in the second region is referred to as a gate wiring 140b. That is, among the plurality of gate wirings 140, each of the wiring groups disposed below the boundary line 16 is referred to as a gate wiring 140b, and each of the wiring groups disposed above the boundary line 16 is referred to as a gate wiring. 140a. The first region 10a corresponding to the gate wiring 140a and the second region 10b corresponding to the gate wiring 140b are arranged adjacent to each other in the vertical direction and are separated by a boundary line 16. The first region 10a is composed of pixels corresponding to all the gate lines 140a, and the second region 10b is composed of pixels corresponding to the gate lines 140b. Each of the source lines 130 is formed in the first region 10 a and the second region 10 b across the boundary line 16. The gate wiring 140a and the gate wiring 140b are different from each other in the plurality of gate wirings 140.

  In addition, it is desirable to provide the boundary line 16 in the center of the display area 10 so that the first area 10a and the second area 10b have the same area. Thereby, the number of gate wirings formed in the first region 10a and the second region 10b becomes the same. The number of gate wirings formed in the first region 10a and the second region 10b is half of the total number of gate wirings. As a result, the left and right frame regions 9 can have substantially the same width, and a narrow frame can be achieved. This is suitable when the frame area 9 in the X direction is limited.

  In the frame region 9, a routing wiring 141 a that connects the gate wiring 140 a and the gate driver IC 14 and a routing wiring 141 b that connects the gate wiring 140 b and the gate driver IC 14 are formed. A signal from the gate driver IC 14 is input to the gate wiring 140a through the routing wiring 141a, and a signal from the gate driver IC 14 is input to the gate wiring 140b through the routing wiring 141b. A plurality of routing wirings 141a are provided, and are respectively connected to the plurality of gate wirings 140a. A plurality of routing wirings 141b are provided, and are respectively connected to the plurality of gate wirings 140b.

  Here, the routing wiring 141a for the gate wiring 140a is formed at the substrate end 17 on the source driver IC side (left side). On the other hand, the routing wiring 141b for the gate wiring 140b is formed at the substrate end 18 on the gate driver IC 14 side (right side). That is, the routing wiring 141 a is formed on the left side of the display area 10, and the routing wiring 141 b is formed on the right side of the display area 10. The lead wiring 141 a and the lead wiring 141 b are formed so as to sandwich the display area 10. The gate wiring 140a is supplied with a signal from the substrate end 17 on the source driver IC 13 side, and the gate wiring 140b is supplied with a signal from the substrate end 18 on the gate driver IC 14 side. The lead wiring 141a and the lead wiring 141b are formed of, for example, a metal film in the same layer as the gate wiring 140a. Therefore, although the gate wiring 140 and the routing wiring 141 are described as separate wirings, they are actually formed as one wiring.

  Here, since the first region 10a is disposed above the boundary line 16, the routing wiring 141a has a longer signal transmission distance than the routing wiring 141b. That is, since the distance from the gate driver IC 14 differs between the first region 10a and the second region 10b, a difference occurs in the transmission distance. In the present embodiment, the folded portion 19 is formed in the lead wiring 141b in order to prevent the wiring delay difference of each gate wiring due to the difference in transmission distance. That is, the routing wiring 141b for connecting to the gate wiring 140b whose distance from the gate driver IC 14 is shorter than the gate wiring 140a is extended beyond the boundary line 16 to a position corresponding to the first region 10a. Yes. Then, a folded portion 19 is provided in the routing wiring 141b so as to be connected to a predetermined gate wiring 140b arranged in the second region 10b from the extended position. The folded portion 19 is disposed at a position corresponding to the first region 10 a above the boundary line 16. The routing wiring 141b extended to a position corresponding to the first region 10a has a folded shape and is folded back to a position corresponding to the second region below the boundary line 16. The folded portion is provided at the substrate end 18 on the gate driver IC 14 side.

  By routing the routing wiring 141b connected to the gate wiring 140b arranged in the second region 10b to a position corresponding to the first region (above the boundary line 16), the wiring length can be increased. . Therefore, the wiring resistance difference between the gate wiring 140a and the gate wiring 140b can be reduced, and the wiring delay difference can be reduced. In FIG. 1, the folded portion 10 is provided in the vicinity of the upper substrate end, but may be located at a position corresponding to the first region 10 a (above the boundary line 16).

  Furthermore, it is desirable to provide the folded portion 19 so that the gate wiring 140a closest to the boundary line 16 in the first region 10a and the gate wiring 140b closest to the boundary line 16 in the second region 10b have substantially the same wiring resistance. . In FIG. 1, the gate wiring 140a closest to the boundary line 16 in the first region 10a and the gate wiring 140b closest to the boundary line 16 in the second region 10b are indicated by bold lines. The gate line 140a indicated by the thick line closest to the boundary line 16 in the first region 10a is the lowermost gate line in the first region 10a. The gate wiring 140b indicated by the thick line closest to the boundary line 16 in the second region 10b is the uppermost gate wiring in the second region 10b.

  If there is a difference in the wiring resistance of the gate wiring 140 at the boundary between the first region 10a and the second region 10b, display unevenness is likely to be visually recognized. In order to prevent this, the wiring lengths of the routing wiring 141a and the routing wiring 141b in the gate wiring 140a and the gate wiring 140b closest to the boundary line 16 arranged so as to sandwich the boundary line 16 are substantially the same. Thereby, the wiring length including the routing wiring 141 of the gate wiring 140a and the gate wiring 140b on both sides of the boundary line 16 can be made the same length. By adjusting the position of the folded portion 19 according to the size of the liquid crystal panel, the position of the boundary line 16, and the like, the wiring lengths of the gate wiring 140a and the gate wiring 140b closest to the boundary line 16 can be made substantially the same. .

  Further, in order to make the wiring resistances of the gate wiring 140a and the gate wiring 140b closest to the boundary line 16 substantially the same, in the gate wiring 140a and the gate wiring 140a closest to the boundary line 16, the routing wiring 141a and the routing wiring 141b These wiring widths are substantially the same. By making the wiring width the same, it is possible to make the variation of the wiring resistance with respect to the side etching amount at the time of forming the wiring pattern the same.

  In general, when the amount of side etching varies, a wiring with a narrow wiring width has a larger variation in wiring resistance than a wiring with a thick wiring width. For example, if the wiring length is changed to the same wiring resistance for wirings with different wiring widths, even if the wiring width is designed in consideration of side etching, if the side etching amount varies, the difference in wiring width will Based on this, a difference occurs in the wiring resistance. In the present embodiment, by adjusting the position of the folded portion 19, the gate wiring 140 a and the gate wiring 140 b that are closest to the boundary line 16 can have the same wiring length. Further, by making the routing wiring 141 corresponding to the gate wiring 140a and the gate wiring 140b closest to the boundary line 16 have the same wiring width, the wiring resistance difference around the boundary line 16 can be reduced. As a result, a liquid crystal display device with high display quality can be provided even when the side etching amount varies.

With the above-described configuration, even when the gate driver IC 14 and the source driver IC 13 are arranged on one side of the substrate, it is possible to realize a narrow frame and reduce a wiring resistance difference. Moreover, the wiring resistance difference in the boundary region can be reduced. The wiring resistance difference in all the gate wirings 140 including the lead wirings 141 can be made smaller than the wiring resistance of the gate wirings 140 in the display area. That is, the wiring resistance (including the routing wiring 141) of the gate wiring 140 having the highest wiring resistance is R _h , and the wiring resistance of the gate wiring 140 (including the routing wiring 141) having the lowest wiring resistance is R _l . when the wiring resistance of the gate wiring 140 of the wiring resistance (without lead wiring 141) as _{R d,} may be a _{(R h -R l) ≦ R} d. Since the gate line 140 is formed with the same width in the display region 10, the wiring resistance in the display region 10 that does not include the lead-out line 141 is substantially the same in any gate line 140.

  In the above description, the routing wiring 141 of the gate wiring 140 is provided on both the left and right sides of the display area 10, but the routing wiring of the source wiring 130 may be provided on both sides of the display area. In this case, the gate driver IC 14 and the source driver IC 13 are replaced.

Embodiment 2 of the Invention
A liquid crystal display device according to this embodiment will be described with reference to FIG. FIG. 2 is a plan view schematically showing a configuration of a liquid crystal panel used in the liquid crystal display device. The description of the same configuration as that in Embodiment 1 is omitted. Reference numeral 15 denotes a common wiring lead-out line, 15c denotes a crossing electrode formed as a part of the common wiring lead-out wiring, and 20 denotes a crossing portion where the source wiring 130 and the routing wiring 140a cross each other.

  In the present embodiment, unlike the first embodiment, the folded wiring 141b of the liquid crystal panel 1 is not provided with a folded portion. In the present embodiment, the crossing electrode 15c is formed in the gate wiring 140 in order to reduce the wiring capacitance difference based on the difference generated in the crossing capacitance with the source wiring 130. The crossing electrode 15 c extends from the lead-out wiring 15 that is led out from the common wiring provided substantially parallel to the gate wiring 140 in the display region 10. In the present embodiment, in the gate wiring 140, the width of the common wiring is changed on the left and right sides in order to reduce the wiring capacity difference based on the difference generated in the cross capacitance with the source wiring 130. This will be described below.

  The gate driver IC 14 is provided on the left side of the source driver IC 13. Accordingly, the lead wiring 141a passes between the source driver IC 13 and the display area 10 and is led to the left substrate end 17. The gate wiring 140a intersects with the source wiring 130 through the insulating film at the intersecting portion 20. As a result, a cross capacitance occurs in a region where the gate line 140a and the source line 130 intersect.

  On the other hand, since the gate driver IC 14 is provided on the left side of the source driver IC 13, the lead wiring 141 b is routed to the right substrate end without intersecting the source wiring 130. For this reason, there is a difference in wiring capacitance between the lead wiring 141a and the lead wiring 141. That is, the lead-out wiring 141b having a large crossing area with the source wiring 130 in the frame region 9 has a larger wiring capacity than the lead-out wiring 141a. When the wiring capacitance difference is large, there is a risk of causing a wiring delay.

  In the present embodiment, common wiring lead-out lines 15 are formed on both the left and right sides of the display area 10. The common wiring lead-out line 15 connects a common wiring (not shown) formed between the gate wirings 140 in the display area in the frame area 9. The common wiring lead-out line 15 is formed along the Y direction on the substrate end 17 on the source driver IC side and on the substrate end 18 on the gate driver IC side. The common wiring lead-out line 15 is provided adjacent to the display area 10 over the entire vertical direction of the display area 10. The common wiring lead-out line 15a provided at the substrate end 17 on the source driver IC side is provided on the left side of the display area 10 with a certain width. On the other hand, the common wiring lead-out line 15 b provided at the substrate end 18 on the gate driver IC side is provided on the right side of the display area 10. Since the common wiring lead-out line 15 is formed in a different layer from the gate wiring 140, it is insulated from the lead-out wiring 141. The common wiring lead-out line 15 is formed along the Y direction. The common wiring is formed of a metal film in the same layer as the gate wiring 140 and is formed through the contact hole with the lead-out wiring 15.

  A part of the common wiring lead line 15b is extended in the X direction in order to reduce a wiring capacitance difference. This extended portion becomes a cross electrode 15c that crosses the gate wiring 141b. The cross electrode 15c is formed in a region corresponding to the second region 10b. That is, a part of the common wiring lead line 15b is wider than the common wiring lead line 15a. The common wiring lead-out line 15b is formed so that the width thereof changes in the vicinity of the boundary line 16. In most of the areas corresponding to the first area 10a, the common wiring lead-out line 15b has the same width as the common wiring lead-out line 15a. On the other hand, in most regions corresponding to the second region 10b, the lead wiring 15b is formed wider than the lead wiring 15a.

  Since the intersection electrode 15c is formed on a part of the common wiring lead line 15b, the area where the lead wiring line 141b and the common wiring lead line 15b intersect increases. The lead wiring 141a does not intersect with the common lead wiring 15a but intersects with the source wiring 130. The crossing electrode 15c is formed so that the crossing area of the routing wiring 141b and the crossing area of the routing wiring 141a are substantially equal. As a result, the wiring capacity of the routing wiring 141b increases, and the wiring capacity difference with the routing wiring 141a can be reduced. A part of the lead wiring 15b extends in the X direction so that the cross electrode 15c overlaps the lead wiring 141b. That is, the lead wiring 15b is provided wide so that the crossing electrode 15c overlaps the lead wiring 141b.

  The amount of increase in the wiring capacity of the routing wiring 140b is determined based on the amount of increase in the wiring capacity caused by the intersection of the source wiring 130 and the routing wiring 141a. By adjusting the length of the crossing electrode 15c, that is, the length of the wide portion of the lead wiring 15b, the wiring capacity of the lead wiring 140b and the wiring capacity of the lead wiring 141a can be made substantially equal. Thereby, the difference in the wiring delay based on the wiring capacity between the first region 10a and the second region 10b can be reduced.

With the above-described configuration, the wiring capacity difference can be reduced to half or less of the wiring capacity in the display area. That is, the wiring capacity of the gate wiring 140 having the highest wiring capacity (including the routing wiring 141) is C _h , the wiring capacity of the gate wiring 140 having the lowest wiring capacity (including the routing wiring 141) is C _l , and the display area In the case where the wiring capacity of the gate wiring 140 (not including the routing wiring 141) is C _d , (C _h −C _l ) ≦ C _d can be satisfied. Thereby, wiring delay can be reduced and display quality can be improved.

  In the above description, the cross electrode 15c is formed by extending a part of the lead wiring 15b, but may be formed by a part of the ground wiring for driving the power supply. For example, a part of the ground wiring connected to the gate driver IC 14 or the source driver IC 13 with a potential different from that of the common wiring can be extended to provide the cross electrode. The area of the region intersecting with the gate wiring 141b can be increased, and the wiring capacitance difference can be reduced.

  In the above description, the routing wiring 141 of the gate wiring 140 is provided on both the left and right sides of the display area 10, but the routing wiring of the source wiring 130 may be provided on both sides of the display area. In this case, the gate driver IC 14 and the source driver IC 13 are replaced.

  Note that the wiring delay difference can be reduced by combining the first embodiment and the second embodiment described above. That is, in the configuration shown in FIG. 2, a folded portion may be provided in the routing wiring 141 b. In this case, it is desirable to optimize the wiring time constant rather than improving the wiring resistance difference and the wiring capacitance difference separately. That is, it is desirable to design the wiring layout so that the difference in time constant between the first region 10a and the second region 10b is small.

  Although the liquid crystal panel has been described in the first embodiment and the second embodiment, the present invention is also applied to various types of liquid crystal display devices other than the above, or other display devices such as an organic EL display device and an inorganic EL display device. can do.

It is a figure which shows the structure of the liquid crystal display device concerning Embodiment 1 of this invention. It is a figure which shows the structure of the liquid crystal display device concerning Embodiment 2 of this invention.

Explanation of symbols

1 LCD panel, 8 array substrate, 9 frame area, 10 display area,
10a first region, 10b second region, 11, control circuit,
13 source driver IC, 14 gate driver IC,
15 common wiring, 15c crossing electrode, 16 boundary line 17 substrate end on source driver IC side, 18 substrate end on gate driver IC side,
19 Folding part, 20 Intersection part,
130 source wiring, 140 gate wiring, 141 routing wiring

Claims (4)

A display panel provided with a display area and a frame area arranged around the display area;
A plurality of scanning lines provided in the display area;
A plurality of signal lines intersecting the scanning lines in the display area;
A scanning line driving circuit for supplying a scanning voltage to the scanning line;
A signal line driving circuit for supplying an image voltage to the signal line,
The scanning line driving circuit and the signal line driving circuit are display devices arranged on the same side of the display panel,
The display area is
A first region corresponding to a first scanning line group that is a part of the plurality of scanning lines;
A part of the plurality of scanning lines, corresponding to a second scanning line group different from the first scanning line group, and disposed closer to the scanning line driving circuit than the first region. Two regions,
A first routing wiring group provided at an end of the side adjacent to the signal line driving circuit of the display panel and connecting the scanning line driving circuit and the first scanning line group; ,
A second routing which is provided at an end of a side opposite to the side where the first routing wiring group of the display panel is provided, and connects the scanning line driving circuit and the second scanning line group. With wiring group,
The first routing line corresponding to the scanning line adjacent to the boundary line in the first scanning line group and the second corresponding to the scanning line adjacent to the boundary line in the second scanning line group. The lead wiring is formed with approximately the same length,
The first routing line corresponding to the scanning line adjacent to the boundary line in the first scanning line group and the second corresponding to the scanning line adjacent to the boundary line in the second scanning line group. The lead wiring is formed with substantially the same width ,
The second routing wiring extends beyond a boundary line between the first region and the second region to a position corresponding to the first region, and is formed at a position corresponding to the first region. Connected to the second scanning line group via a folded portion,
A display device in which the scanning line driving circuit is disposed closer to the substrate end portion where the second routing wiring is provided than the signal line driving circuit. The display device according to claim 1 , wherein the number of scanning lines included in the first scanning line group is the same as the number of scanning lines included in the second scanning line group. A display panel provided with a display area and a frame area arranged around the display area;
A plurality of scanning lines provided in the display area;
A plurality of signal lines intersecting the scanning lines in the display area;
A scanning line driving circuit for supplying a scanning voltage to the scanning line;
A signal line driving circuit for supplying an image voltage to the signal line,
The scanning line driving circuit and the signal line driving circuit are display devices arranged on the same side of the display panel,
The display area is
A first region corresponding to a first signal line group that is a part of the plurality of signal lines;
The second signal line group is a part of the plurality of signal lines, corresponds to a second signal line group different from the first signal line group, and is disposed closer to the signal line driver circuit than the first region. Two regions,
A first routing wiring group provided at an end of the side adjacent to the signal line driving circuit of the display panel and connecting the signal line driving circuit and the first signal line group; ,
A second lead wiring provided at an end of the side opposite to the side on which the first lead wiring is provided of the display panel and connecting the signal line driving circuit and the second signal line group. With groups ,
The first routing line corresponding to the signal line adjacent to the boundary line in the first signal line group and the second corresponding to the signal line adjacent to the boundary line in the second signal line group. The lead wiring is formed with approximately the same length,
The first routing line corresponding to the signal line adjacent to the boundary line in the first signal line group and the second corresponding to the signal line adjacent to the boundary line in the second signal line group. The lead wiring is formed with substantially the same width,
The second routing wiring extends beyond a boundary line between the first region and the second region to a position corresponding to the first region, and is formed at a position corresponding to the first region. Connected to the second signal line group through the folded portion,
A display device in which the signal line driver circuit is disposed closer to the end of the substrate where the second routing wiring is provided than the scanning line driver circuit . 4. The display device according to claim 3 , wherein the number of signal lines included in the first signal line group is the same as the number of signal lines included in the second signal line group.

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