JPH04324826A - Liquid crystal display device with built-in driver - Google Patents

Abstract

PURPOSE:To reduce the width of the part not contributing to displaying, by overlapping the built-in driver zone on a glass base board and the seal of a liquid crystal panel. CONSTITUTION:A seal 6 does not include glass fiber as a spacer. Therefore, a spacer 8 is provided in the middle part between the driver zone and the picture element region or the opaque part therein so as to determine the gap between two base boards. The spacer 8 is fabricated by applying photo-sensitive polyimide to either of glass base boards in an amount corresponding to the thickness of the gap, followed by the photolithographic process to leave spacer, or by applying upon including plastic ball in a dia. the same as the thickness of polyimide gap followed by photolithography to form spacer. Therein the built-in driver zone on the glass base board is overlapped on the seal of the liquid crystal panel.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seal structure for a liquid crystal display device with a built-in driver, and more particularly to miniaturization of a liquid crystal display device.

0002

[Prior Art] Active matrix type liquid crystal display devices have made remarkable progress in recent years, and their applications are expanding to include small liquid crystal TVs, laptop computers, liquid crystal projectors, viewfinders for video cameras, and aircraft cockpit displays. This contributes to the miniaturization of equipment. Among these, active matrix liquid crystal display devices using polycrystalline silicon take advantage of their high mobility.
It is possible to form peripheral driver circuits for display devices on the same substrate, and it is currently being put into practical use as viewfinders for video cameras and light valves for liquid crystal projectors. Driver built-in liquid crystal display devices form peripheral driver circuits on the same substrate, so they are smaller and require less mounting process than the conventional method of attaching external driver ICs to the periphery of the panel using TAB mounting. It had the advantage of saving processing costs.

3 and 4 are a plan view and a sectional view of a conventional liquid crystal display device with a built-in driver, in which 1 is a TFT substrate, 2 is a color filter substrate, 3 is a pixel area, 4 is a gate line driver, and 5 is a lease wire driver, 6 is a seal, and 7 is an input pad. As can be seen from FIGS. 3 and 4, the driver 4 and the seal 6 are arranged offset. This is a spacer (used to create a certain gap between two glass substrates) in the adhesive used as a seal.
Usually, it is mixed with a few micrometers in diameter.
This is because there was a risk that the spacer would destroy the driver element if they were overlapped.

0004

SUMMARY OF THE INVENTION As described above, driver-built-in liquid crystal display devices contribute to miniaturization of video viewfinders, light valves of liquid crystal projectors, and the like. However, in recent years there has been a strong demand for miniaturization of devices such as video cameras and liquid crystal projectors, and as a result, there has been a strong demand for miniaturization of liquid crystal display devices as well. In particular, the screens that users see are large, and there is a strong demand for the surrounding areas that do not contribute to the display to be as small as possible, and the widths of the driver area and seal area of LCD devices are being reduced rapidly. Currently, we have reached the limit where it is no longer possible to form a seal or ensure the reliability of the seal.

[0005] Accordingly, an object of the present invention is to reduce the width of the portion that does not contribute to display by providing a means for overlapping a seal in the driver area.

[0006]

[Means for Solving the Problems] A liquid crystal display device with a built-in driver according to the present invention is a liquid crystal display device with a built-in driver in which at least one of the driving circuits of a gate line or a source line is formed on a glass substrate. The built-in driver area and the LCD panel sticker overlap.

[0007] Furthermore, the driver-incorporated liquid crystal display according to the present invention is characterized in that it does not include a spacer for maintaining a constant gap between two opposing glass substrates.

[0008] Furthermore, in the driver-built-in liquid crystal display device of the present invention, an opaque portion within the pixel region or a spacer is formed to maintain a constant gap between the two glass substrates facing each other at the intermediate portion between the pixel region and the driver region. It is characterized by what it did.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A plan view and a sectional view of an embodiment of the present invention are shown in FIGS. 1 and 2. 1 is a TFT substrate, 2 is a color filter substrate, 3 is a pixel region 4 is a gate line driver, 5 is a source line driver, 6 is a seal, 7 is an input pad, and 8 is a spacer. The seal 6 of this embodiment does not include glass fiber as a spacer. Therefore, in order to determine the gap between the two substrates, a spacer 8 is provided in the opaque area within the pixel area or in the intermediate area between the pixel area and the driver area. FIG. 5 is an enlarged plan view of the pixel portion of the liquid crystal display device of this embodiment, where 8 is a spacer, 9 is an opening of the pixel, and 10 is an opaque portion within the pixel area. The opaque area within the 10 pixel area is generally called a black matrix.

Although various methods can be considered for creating the spacer 8, two typical methods are listed below. The first method is to apply photosensitive polyimide to one side of a glass substrate to the thickness of the gap (5 to 10 μm) and then leave spacers by photolithography. The second method is to mix and coat photosensitive polyimide with plastic balls having a diameter equal to the thickness of the gap, and also to form spacers using photolithography. In any case, any method that can selectively form spacers is applicable.

Furthermore, since the seal 6 does not contain glass fiber, even if it is overlapped with a driver, there is no fear of disconnection of the wiring or destruction of the transistor.

0012

[Effects of the Invention] As described above, according to the present invention, the glass fiber as a spacer is removed from the seal, and instead, polyimide is formed in the opaque part in the pixel area or in the intermediate part between the pixel area and the driver area. By providing a spacer, the driver and the seal can be overlapped, and the width of the portion that does not contribute to display can be reduced. Specifically, the width of the driver area is about 0.9 mm, the width of the seal area is about 1.3 mm, and if the present invention is not applied, the width of the part that does not contribute to display needs to be at least 2.2 mm. However, by applying the present invention, the width of the driver area can be reduced by 0.9 mm.

[Brief explanation of drawings]

FIG. 1 is a plan view of a driver-built-in liquid crystal display device of this embodiment.

FIG. 2 is a cross-sectional view of the driver-built-in liquid crystal display device of this embodiment.

FIG. 3 is a plan view of a conventional driver-built-in liquid crystal display device.

FIG. 4 is a sectional view of a conventional driver built-in liquid crystal display device.

FIG. 5 is an enlarged plan view of a pixel portion of the driver-built-in liquid crystal display device of this embodiment.

[Explanation of symbols]

1 TFT substrate 2 Color filter substrate 3 Pixel area 4 Gate line driver 5 Source line driver 6 Seal 7 Input pad 8 Spacer 9 Pixel aperture 10 Opaque area in pixel area

Claims (3)

[Claims] 1. A driver built-in liquid crystal display device in which at least one of a gate line or a source line drive circuit is formed on a glass substrate, characterized in that a built-in driver area on the glass substrate and a seal on the liquid crystal panel overlap. LCD display device with built-in driver. 2. The built-in driver type according to claim 1, wherein a spacer for maintaining a constant gap between the two glass substrates is not mixed into the seal for bonding the two opposing glass substrates together. LCD display device. 3. A spacer as claimed in claim 1, wherein a spacer is formed in an opaque portion within a pixel region or in an intermediate portion between the pixel region and the driver region to maintain a constant gap between the two glass substrates facing each other. 3. The driver built-in liquid crystal display device according to claim 2.