JPH05119344A - Liquid crystal display device - Google Patents

Abstract

PURPOSE:To enable display with high fineness while decreasing display abnormality by dividing one picture element to 4 pieces of picture elements. CONSTITUTION:Four pieces of thin-film transistors(TFTs) disposed on the one unit picture element are connected independently to a scanning line 1 and 4 pieces of accumulation capacitors 8a to 8d disposed in the one picture element are also connected independently to an accumulation wiring 7. As a result, the high-fineness display is obtd. while the display abnormality of the picture element units is decreased.

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, and more particularly to a structure of a pixel electrode, a storage capacitor and a thin film transistor in the same pixel.

[0002]

2. Description of the Related Art Conventionally, the structure of a pixel unit of an active matrix type liquid crystal display device comprises one thin film transistor (TFT) as shown in FIG. However, the signal wiring 22 is provided as the supply source of the signal voltage. Further, one storage capacitor 28 for holding the voltage applied to the liquid crystal and the storage capacitor wiring 27 accompanying it are provided. It should be noted that D represents the width of one pixel and E represents the length of one pixel.

[0003]

When a short circuit of one thin film transistor or a short circuit of one storage capacitor occurs in one pixel of a conventional liquid crystal display device, the area of one pixel is large and the display point is large. There was a problem that it was easily recognized as a defect.

[0004]

The liquid crystal display device of the present invention has four pixel electrodes controlled by one thin film transistor in one pixel, and four pixel electrodes in one pixel.
Each thin film transistor has a structure in which it is independently connected to the scan wiring. The distance between the scanning wiring and the thin film transistor on the amorphous silicon film deposited on the scanning line serving as the gate electrode is 10 μm which can be corrected by laser.
In addition, the distance between the storage capacitor and the storage capacitor wiring is 10 μm or more that can be corrected by a laser.

[0005]

The present invention will be described below with reference to the drawings. FIG. 1 shows one pixel on the TFT substrate side which is a part of the liquid crystal display device of the present invention. The present invention has a structure in which one pixel is divided into four. After the storage capacitors 8a, 8b, 8c, 8d and the storage capacitor wiring 7 are provided on the substrate and further the scanning wiring 1 is provided and the gate insulating film is deposited,
Amorphous silicon films 3a, 3b, 3c, 3d are patterned on a part of the scanning wiring 1 serving as a gate electrode, and source electrodes 5a, 5b, 5c, 5d and drain electrodes 4a, 4b, 4c, 4d are provided thereon. To form a TFT. The above-mentioned TFT and storage capacitor are
The divided pixel electrode 6a, pixel electrode 6b, and pixel electrode 6
One is provided for each of c and the pixel electrode 6d and has an independent function.

The space between the storage capacitor 8 and the storage capacitor wiring 7 and the space between the scanning wiring 1 and the end face of the amorphous silicon film of each TFT are 10 μm or more.
This is so that the wiring can be cut by the laser when a short circuit or the like occurs in the TFT or the storage capacitor and a display abnormality occurs. As described above, according to the present invention, one unit pixel can be made small and high-definition display is possible.

[0007]

As described above, according to the present invention, one pixel electrode is divided into four pixel electrodes and a TFT and a storage capacitor are arranged in each unit pixel in order to obtain a high-definition display. Pixels can be miniaturized, and one unit pixel has an independent function, and even if a point defect occurs in one or two of the four pixels, it is difficult to recognize it as a defect. There is.

Further, in order to reduce the display abnormality, the TFT
Alternatively, the wiring connected to the electrode at the location short-circuited by the storage capacitor can be cut with a laser, which has the effect of reducing bright spots and defects.

[Brief description of drawings]

FIG. 1 is a plan view of a unit pixel region of a TFT substrate according to a first embodiment of the present invention.

FIG. 2 is a plan view of a unit pixel area of a conventional TFT substrate.

[Explanation of symbols]

1, 21 Scan line 2, 22 Signal line 3a, 3b, 3c, 3d, 23 Amorphous silicon film 4a, 4b, 4c, 4d, 24 Drain electrode 5a, 5b, 5c, 5d, 25 Source electrode 6a, 6b, 6c, 6d, 26 Pixel electrode 7, 27 Storage capacitance wiring 8a, 8b, 8c, 8d, 28 Storage capacitance

Claims (2)

[Claims] 1. A pixel has four pixel electrodes controlled by one thin film transistor, and four pixel electrodes within this pixel are provided.
A liquid crystal display device characterized in that each of the thin film transistors is independently connected to the scanning wiring, and further has four storage capacitors in one pixel. 2. The distance between the scanning wiring connected to the thin film transistor in the same pixel and the end face of the amorphous silicon film and the distance between the storage capacitor and the storage capacitor wiring are 10 μm.
The liquid crystal display device according to claim 1, wherein the liquid crystal display device is provided above.