JP2893433B2 - Liquid crystal display - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device having a driver circuit provided on a liquid crystal display panel.

[0002]

2. Description of the Related Art Since liquid crystal display devices can be made small and thin, they are widely used as display devices such as word processors, personal computers, and liquid crystal televisions instead of display devices such as CRT displays. A liquid crystal display device used for such a purpose usually has a driver circuit for driving a thin film transistor connected to each display element (pixel) in the liquid crystal display panel on a circuit board separate from the liquid crystal display panel of the device. Is provided. However, a liquid crystal display device in which the above driver circuit is provided in a liquid crystal display panel has been devised due to a recent demand for miniaturization of the device.

FIG. 3 is a schematic plan view of a liquid crystal display device in which a driver circuit is provided on a liquid crystal display panel, and FIG. 4 is a sectional view thereof. Both figures show an active matrix type liquid crystal display device. In both figures, the liquid crystal display device is configured as follows. That is, one of the glass substrates 4, the gate lines G ₁ ~G _m and the drain line D ₁ to D _n of the thin film transistor 2 and the transistor 2 for driving the transparent electrode 1 of the transparent electrode 1 Toko becomes a pixel electrode
Are formed, and an alignment film 3 is formed on these pixels and each element. On the other glass substrate 7, a transparent common electrode 5 and an alignment film 6 are formed on the common electrode 5. The one glass substrate 4 and the other glass substrate 7
Are opposed to each other and are adhesively polymerized by the seal member 8. Liquid crystal 9 is injected between the two glass substrates 4 and 7, and the liquid crystal 9 is sealed with a sealing member 10. Also, a gate line driving circuit 1 for driving the thin film transistor 2
The first and drain line driving circuits 12 are formed on one of the glass substrates 4 at a peripheral portion of the substrate outside the sealing member 8.

In this active matrix type liquid crystal display device, _one of the gate lines G _{1 to} G _m is sequentially selected by a timing signal output from the gate line driving circuit 11, and the selected gate lines G _{1 to} G _m are selected. Is applied to the transparent electrode 1 to operate the liquid crystal interposed between the opposing electrodes. In this way, a driving voltage is applied to the pixel electrode corresponding to the transparent electrode 1,
An image is displayed by the plurality of pixel electrodes. Further, image data and control signals for operating the gate line driving circuit 11 and the drain line driving circuit 12 are transmitted from a terminal 14 connected to an image data output device (not shown) to a control signal line 1.
3 is provided.

[0005]

In the conventional liquid crystal display device described above, in the range of several mm near the inside of the seal member 8, unevenness in the substrate gap and poor alignment occur, so that a plurality of transparent electrodes 1 are required. The seal member 8 is formed outside the display area (the area within the rectangular frame S in FIG. 3) in which the seal member 8 is provided, and the gate line driving circuit is further provided on the outer periphery of the substrate. 11 and the drain line drive circuit 12 were arranged.

For this reason, the substrate of the liquid crystal panel has a larger peripheral substrate area than the display area, and the outer shape of the liquid crystal display panel becomes large, which hinders miniaturization of the device. .

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and an object of the present invention is to provide a liquid crystal display device capable of miniaturizing the device.

[0008]

According to the liquid crystal display device of the present invention, a pair of transparent substrates are bonded via a frame-shaped sealing member, and a liquid crystal is sealed between the pair of substrates inside the sealing member. In a liquid crystal display device in which a display region having a plurality of pixel electrodes is formed on one substrate side and a counter electrode is formed inside the other substrate, a driver circuit including a thin film transistor is partially covered with the seal member. The remaining portion is formed so as to be covered with the liquid crystal, and the portion covered with the liquid crystal is formed within a range of several mm from a boundary surface between the seal member and the liquid crystal. It is. By doing so, the non-display area, which is wasted due to poor alignment of the liquid crystal and non-uniform substrate spacing, is effectively used, so that the liquid crystal display panel itself is configured to be small and the liquid crystal display device is downsized. Can be.

[0009]

According to the liquid crystal display device of the present invention, a driver circuit including a gate line driving circuit and a drain line driving circuit for operating a thin film transistor is provided in the vicinity of a seal member in which unevenness is likely to occur in a substrate gap and alignment unevenness is likely to occur. It was arranged near the inside of the area surrounded by the seal member formed of the member.

With this configuration, it is not necessary to provide a peripheral region for forming a driver circuit outside the seal member of the substrate, so that the size of the liquid crystal display device can be reduced.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic plan view of a liquid crystal display device according to one embodiment of the present invention, and FIG. 2 is a sectional view of FIG. In the figure, a glass substrate 17 is made of glass, quartz or the like, and gate lines G _{1 to} G _m are provided on the glass substrate 17.
Pixel electrode 19, thin film transistor 20, drain line D ₁
To D _n display area arranged in a matrix (area in the rectangular frame S in FIG. 1) is provided on the outside of the display area, the connected gate line drive to the gate lines G ₁ ~G _m Circuit (driver circuit) 21 and the drain lines D _{1 to} D ₁
Drain line drive circuit (driver circuit) 2 connected to _n
2 are formed. The drain line driving circuit 22 and the gate line driving circuit 21
And the like are formed at the same time when they are formed on the glass substrate 17, and are disposed inside a region surrounded by a seal member described later. The pixel electrode 19, the thin film transistor 20, the gate line driving circuit 21,
On the drain line driving circuit 22, an alignment film 23 is further formed.

As in the case of the glass substrate 17, the surface of a glass substrate 18 made of glass, quartz, etc.
The common electrode 24 is formed, as shown by, and an alignment film 25 is further formed on the common electrode 24.

The alignment films 23 and 25 formed on the glass substrates 17 and 18 are oriented so that the glass substrates 17 and 18 are opposed to each other with the alignment films 23 and 25 facing each other. Are joined at a predetermined interval by a frame-shaped seal member 26 formed at a predetermined distance. The opening 2 of the sealing member is provided between the glass substrates 17 and 18.
Liquid crystal 28 is injected from 7, and the opening 27 is sealed by a sealing member 29. At this time, the gate line drive circuit 21 and the drain line drive circuit 22, the end portion of the inner side is exposed from the sealing member 26 on the inside, Ru covered by the liquid crystal 28. It is to be noted that supply of image data and control signals to the gate line drive circuit 21 and the drain line drive circuit 22 is performed by an image data output device (not shown) via the control signal line 30 and the terminal 31. The same is true.

As described above, the gate line drive circuit and the drain line drive circuit 22 are connected to the inside of the seal member 26, which is a portion where poor alignment of the liquid crystal 28 and unevenness of the substrate interval are likely to occur .
That is, a range of several mm from the boundary surface between the seal member and the liquid crystal.
Since the liquid crystal display panel is formed inside , the size of the liquid crystal display panel can be reduced as compared with the related art.

Further, since the gate line driving circuit 21 is housed inside the seal member 26, the gate line driving circuit 2
It is not necessary to extend the gate line between the drain line driving circuit and the display region in the same manner as in the prior art. The line can be formed shorter than before, and the resistance of the gate line and the drain line can be reduced.

[0016]

According to the present invention, a driver circuit including a thin film transistor is formed so that a part thereof is covered with the sealing member and the remaining part is covered with the liquid crystal. Since it was formed within a range of several mm from the boundary surface between the member and the liquid crystal, the non-display area, which wasted due to poor alignment of the liquid crystal and non-uniform substrate spacing, was effectively used, and the liquid crystal display panel itself was reduced in size. With this configuration, the size of the liquid crystal display device can be reduced.

Further, since the gate line and the drain line can be shortened, a voltage drop due to the gate line and the drain line can be prevented, and generation of noise can be prevented.

[Brief description of the drawings]

FIG. 1 is a schematic plan view of a liquid crystal display device according to one embodiment.

FIG. 2 is a sectional view of FIG.

FIG. 3 is a schematic plan view of a conventional liquid crystal display device.

FIG. 4 is a sectional view of FIG. 3;

[Explanation of symbols]

 17, 18 Glass substrate 19 Pixel electrode 20 Thin film transistor 21 Gate line driving circuit (driver circuit) 22 Drain line driving circuit (driver circuit) 23, 25 Alignment film 24 Common electrode 26 Sealing member 27 Opening 28 Liquid crystal 29 Sealing member

Claims (1)

(57) [Claims] 1. A pair of transparent substrates are bonded via a frame-shaped sealing member, a liquid crystal is sealed inside the sealing member between the pair of substrates, and one of the substrates has a plurality of pixel electrodes. In a liquid crystal display device in which a display region is formed and a counter electrode is formed inside the other substrate, a driver circuit including a thin film transistor is formed such that a part thereof is covered by the seal member and the remaining part is covered by liquid crystal. A liquid crystal display device, wherein a portion covered with the liquid crystal is formed within a range of several mm from a boundary surface between the seal member and the liquid crystal.