JP4632127B2 - Display device - Google Patents

Description

  The present invention relates to a display device, and more particularly to a liquid crystal display device including a plurality of display pixels and peripheral circuits on a display panel.

  In recent years, with the spread of portable electronic devices such as mobile phones and digital cameras, the demand for liquid crystal display devices is increasing. Next, an outline of a liquid crystal display device according to a conventional example will be described with reference to the drawings. FIG. 4 is an equivalent circuit diagram of the liquid crystal display device. In FIG. 4, only one display pixel 10 is shown from among a plurality of display pixels formed in a matrix in a display area on one display panel.

  As shown in FIG. 4, on a display panel 1P made of a glass substrate or the like, a thin film transistor (TFT) is provided in the vicinity of the intersection of the scanning line 11 extending in the row direction and the data line 12 extending in the column direction. For example, an N-channel type pixel selection TFT 13 is arranged. The gate of the pixel selection TFT 13 is connected to the scanning line 11, and the source thereof is connected to the data line 12. A pixel selection signal G output from the vertical drive circuit 21 is applied to the scanning line 11, and the on / off state of the pixel selection TFT 13 is controlled accordingly. A display signal D is output from the horizontal drive circuit 22 to the data line 12.

  The drain of the pixel selection TFT 13 is connected to a pixel electrode among pixel electrodes and common electrodes (not shown) that sandwich the liquid crystal layer LC. The liquid crystal layer LC is expressed as a capacitor because it functions as a dielectric. The drain of the pixel selecting TFT 13 is connected to a holding capacitor Cs for holding the display signal D applied to the pixel electrode for one horizontal period.

  In the above configuration, the data line 12 is connected to the source of the pixel selection TFT 13 and the pixel electrode is connected to the drain thereof, but the pixel electrode is connected to the source and the data line 12 is connected to the drain. Good.

  Next, the operation of the liquid crystal display device will be described. When the high-level pixel selection signal G is applied to the scanning line 11 over one horizontal period, the pixel selection TFT 13 is turned on. Then, the display signal D output from the data line 12 is held by the holding capacitor Cs through the pixel selection TFT 13 and applied to the pixel electrode. Then, the electric field of the liquid crystal layer is controlled over one horizontal period according to the display signal D, and the alignment of the liquid crystal molecules is controlled according to the electric field. Thereby, black or white liquid crystal display is performed. By performing this operation on the display pixels 10 in all rows over one field period, a desired image can be displayed on the entire display region.

  The display panel 1P has a layout as shown below, for example. That is, as shown in FIG. 5, a display area 10A in which a plurality of display pixels 10 having scanning lines and data lines is arranged on the display panel 1P.

  Around the display area 10, a vertical drive circuit 21 is disposed along the first side E1 of the display panel 1P. In addition, a horizontal drive circuit 22 is disposed along the second side E2 of the display panel 1P orthogonal to the first side E1. A control circuit 30 is disposed along the second side E2 on the side closer to the second side E2 than the horizontal drive circuit 22. This control circuit supplies a control signal such as a synchronization signal and other necessary voltage signals to the vertical drive circuit 21 and the horizontal drive circuit 22.

  A first input circuit connected to the vertical drive circuit 21 and the control circuit 30 is provided on both sides of the control circuit 30 along the first side E1 of the display panel 1P and the third side E3 opposite to the first side E1. 141 and a second input circuit 142 connected to the vertical drive circuit 22 and the control circuit 30 are arranged. The connection is performed through the first and second wirings 151 and 152, respectively.

  These first and second input circuits 141 and 142 perform predetermined processing on signals (control signals and the like) output from the control circuit 30 and input to the vertical drive circuit 22 and the control circuit 30. It is. For example, although not shown, the first and second input circuits 141 and 142 include an electrostatic protection circuit such as a diode circuit and / or a booster circuit that boosts a voltage such as a control signal.

In addition, the following patent documents are mentioned as technical documents relevant to the present application.
Japanese Patent Laid-Open No. 2002-140015

  In areas on both sides of the control circuit 30 along the first side E1 of the display panel 1P and the third side E3 opposite to the first side E1, first and second input circuits 141 and 142 are arranged. For this reason, the areas on both sides of the control circuit 30 are expanded, and there is a problem that the frame of the display panel 1P, that is, an area other than the display area is expanded. As a result, the size of the display panel is increased, and the ratio of the area occupied by the display area to the entire display panel is reduced.

Therefore, the present invention provides a display device in which the area of a frame in which no display area is arranged is minimized.

The display device of the present invention has been made in view of the above problems, and in the display panel, a display area in which a plurality of display pixels including scanning lines and data lines are arranged, and a first side of the display panel disposed on the display panel along a vertical driving circuit for supplying a pixel selection signal to the scanning lines, disposed on the display panel along a second side of the display panel which is perpendicular to the first side, the data line A horizontal driving circuit for supplying a display signal to the display panel , a control circuit disposed on the display panel along the second side, for supplying a control signal to the vertical driving circuit and the horizontal driving circuit, and the first and second A first input circuit arranged in a region on the display panel along any side of the display region among regions along the side of the display panel other than the side, and a third facing the first side. sides, and displayed along the fourth side facing the second side Disposed on panel, the vertical drive circuit, control circuit, and the first wiring for connecting the first input circuit to each other, a second disposed on the region on the display panel along a first side And an input circuit and a second wiring which is disposed on the display panel and connects the horizontal drive circuit, the control circuit, and the second input circuit.

  According to the present invention, the frame of the display panel, that is, the area other than the display area can be made as narrow as possible. As a result, the size of the display panel can be kept as small as possible, and the ratio of the area occupied by the display area to the entire display panel can be maximized.

  Next, a liquid crystal display device according to a first embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a plan view showing a liquid crystal display device according to the present embodiment. In FIG. 1, the same components as those of the liquid crystal display device shown in FIGS. 4 and 5 are denoted by the same reference numerals and described.

  As shown in FIG. 1, a plurality of display pixels 10 similar to those shown in the equivalent circuit diagram of FIG. 4 are arranged in a matrix in a display area 10A of a display panel 1P that is a liquid crystal display device. The scanning line 11 and the data line 12 of each display pixel 10 are connected to a vertical driving circuit 21 and a horizontal driving circuit 22, respectively.

  Here, the vertical drive circuit 21 is disposed close to the display region 10A along the first side S1 of the display panel 1P. Further, the horizontal drive circuit 22 is disposed close to the display region 10A along the second side S2 orthogonal to the first side S1 of the display panel 1P.

  Further, a control circuit 30 similar to that shown in FIG. 5 is disposed along the second side S2 of the display panel 1P in a region closer to the second side S2 than the horizontal drive circuit 22. In this region, instead of the control circuit 30, an FPC (Flexible Printed Circuit) for a user to mount the control circuit later may be formed.

  The first input circuit 41 is arranged in a region along the side of the display region 10A among regions along the third side S3 facing the first side S1 of the display panel 1P. The first input circuit 41 is the same as the first input circuit 141 shown in FIG. 5 except for the arrangement position and the shape of the formation region.

  The first wiring 51 that connects the vertical drive circuit 21 and the first input circuit 41 and connects the control circuit 30 and the first input circuit 41 is opposed to the first side of the display panel 1P. The third side S3 and the fourth side S4 facing the second side S2 are disposed so as to extend. The number of the first wirings 51 corresponds to the number of input / output signals of the first input circuit 41. FIG. 1 shows a case where there are two first wirings 51.

  Further, in the region along the first side S1 of the display panel 1P, the region adjacent to the control circuit 30 has a second input circuit similar to the second input circuit 142 of the conventional example shown in FIG. 42 is formed. In the region, a second wiring 52 for connecting the horizontal drive circuit 21, the control circuit 30, and the second input circuit 42 is disposed.

  As described above, according to the arrangement of the first input circuit 41 and the first wiring 51 of the present embodiment, among the regions along the third side S3 facing the first side S1 of the display panel 1P. An area adjacent to the control circuit 30 can be an empty area. The empty area is an area where the display area 10A is not formed, that is, an area corresponding to a frame. Therefore, the frame area of the display panel 1P can be minimized as compared with the case where the first input circuit 141 as in the conventional example is disposed. As a result, the size of the display panel 1P can be kept as small as possible, and the ratio of the area occupied by the display region 10A to the entire display panel 1P can be maximized.

  Note that, as another example having the same effect as the first embodiment, the first input circuit 41 and the first wiring 51 may be arranged as follows. Next, a liquid crystal display device according to a second embodiment of the present invention will be described with reference to the drawings. FIG. 2 is a plan view showing the liquid crystal display device according to the present embodiment. As shown in FIG. 2, as in the first embodiment, the display area 10A, the vertical drive circuit 21, the horizontal drive circuit 22, the control circuit 30, the second input circuit 42, and the second display area are displayed on the display panel 1P. A wiring 52 is arranged.

  In the present embodiment, unlike the first embodiment, the first input circuit 41 includes the display area 10A in the area along the fourth side S4 facing the second side S2 of the display panel 1P. It is arranged in a region along the side. The first wiring 51 that connects the vertical drive circuit 21 and the first input circuit 41 and connects the control circuit 30 and the first input circuit 41 is connected to the first side S1 of the display panel 1P. It arrange | positions so that it may extend along 3rd edge | side S3 which opposes, and 4th edge | side S4 which opposes 2nd edge | side S2. Also according to the present embodiment, the area of the frame can be minimized as in the first embodiment.

  The first input circuit 41 may be formed at a plurality of locations. Next, a liquid crystal display device according to a third embodiment of the present invention will be described with reference to the drawings. FIG. 3 is a plan view showing the liquid crystal display device according to the present embodiment. As shown in FIG. 3, as in the first embodiment, on the display panel 1P, the display area 10A, the vertical drive circuit 21, the horizontal drive circuit 22, the control circuit 30, the second input circuit 42 and the second input circuit 42 are displayed. A wiring 52 is arranged.

  In the present embodiment, unlike the first and second embodiments, a plurality of, for example, two first input circuits 41A and 41B are arranged on the display panel 1P. One first input circuit 41A is arranged in a region along the side of the display region 10A among regions along the third side S3 facing the first side S1 of the display panel 1P. The other first input circuit 41B is arranged in a region along the side of the display region 10A among the regions along the fourth side S4 facing the second side S2 of the display panel 1P. .

  The first wiring 51 is opposed to the first side S1 of the display panel 1P so as to connect the vertical drive circuit 21, the control circuit 30, and the plurality of first input circuits 41A and 41B to each other. The third side S3 is disposed along the fourth side S4 facing the second side S2. Also according to the present embodiment, the area of the frame of the display panel 1P can be suppressed as small as possible as in the first embodiment.

1 is a plan view showing a liquid crystal display device according to a first embodiment of the present invention. It is a top view which shows the liquid crystal display device which concerns on the 2nd Embodiment of this invention. It is a top view which shows the liquid crystal display device which concerns on the 3rd Embodiment of this invention. It is an equivalent circuit schematic of the display pixel of the liquid crystal display device which concerns on a prior art example. It is a top view which shows the liquid crystal display device concerning a prior art example.

Explanation of symbols

1P Display Panel 10 Display Pixel 10A Display Area 11 Scan Line 12 Data Line 13 Pixel Selection TFT
DESCRIPTION OF SYMBOLS 21 Vertical drive circuit 22 Horizontal drive circuit 30 Control circuit 41,141 1st input circuit 42,142 2nd input circuit 51,151 1st wiring 52,152 2nd wiring Cs Retention capacity LC Liquid crystal layer

Claims (6)

In the display panel, a display area in which a plurality of display pixels having scanning lines and data lines are arranged;
A vertical driving circuit disposed on the display panel along a first side of the display panel and supplying a pixel selection signal to the scanning line;
A horizontal drive circuit disposed on the display panel along a second side of the display panel orthogonal to the first side and supplying a display signal to the data line;
A control circuit disposed on the display panel along the second side and supplying a control signal to the vertical driving circuit and the horizontal driving circuit;
A first input circuit disposed in a region on the display panel along one of the sides of the display region among regions along the side of the display panel other than the first and second sides;
The vertical drive circuit, the control circuit, and the first circuit are disposed on the display panel along a third side that faces the first side and a fourth side that faces the second side. A first wiring for connecting the input circuits of each other;
A second input circuit disposed in a region on the display panel along the first side;
A display device comprising: a second wiring arranged on the display panel and connecting the horizontal driving circuit, the control circuit, and the second input circuit . The display device according to claim 1, wherein the first input circuit is disposed on the display panel along the third side. The display device according to claim 1, wherein the first input circuit is disposed on the display panel along the fourth side. A plurality of the first input circuits are provided, and each first input circuit is disposed on the display panel along the third side or along the fourth side. The display device according to claim 1.   The display device according to claim 1, wherein the first input circuit includes a booster circuit that boosts a voltage of a control signal supplied from the control circuit.   The display device according to claim 1, wherein the first input circuit includes an electrostatic protection circuit.

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