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Liquid crystal display device

A liquid crystal display device and display area technology, applied in nonlinear optics, instruments, optics, etc., can solve the problems of reduced aperture ratio and transmittance, reduced contrast, insufficient utilization of transmission area, etc. Effect

Active Publication Date: 2014-01-22
JAPAN DISPLAY INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In Patent Document 1, in order to reduce the parasitic capacitance between the wiring and the upper electrode, a protruding organic insulating film is formed. However, only the IPS method in which the pixel electrode and the common electrode are comb-shaped electrodes is used as the Inadequate utilization of the transmissive area
[0009] In addition, in Patent Document 2, in the IPS method using a fringe electric field, a protruding organic insulating film is formed on the wiring in order to reduce parasitic capacitance. However, since the pixel electrode is not formed on the organic insulating film, as the wiring Inadequate utilization of the transmissive area near the end
[0010] Furthermore, in Patent Document 1 and Patent Document 2, the region near the step of the protruding organic insulating film cannot be subjected to good rubbing alignment treatment due to the step, and light leakage due to disorder of liquid crystal alignment occurs.
In order to prevent the reduction of contrast caused by this light leakage, a light shielding part (black matrix, etc.) is provided, so the aperture ratio and transmittance decrease

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0079] figure 1 and figure 2 The liquid crystal display device of Example 1 is shown. figure 2 represents the floor plan of a pixel, figure 1 express figure 2 A-B cross-sectional view of one pixel is shown. figure 2 middle, figure 2 (a) shows a plan view from a drain wiring, a gate wiring to a pixel electrode, figure 2 (b) shows a plan view up to the uppermost common electrode. Example 1 is an example in which most of the organic insulating film in the pixel is removed while leaving the organic insulating film on the drain wiring.

[0080] figure 1 Among them, an insulating film 20 and an insulating film 25 are formed on a TFT substrate 10 made of transparent glass, and a drain wiring 30 and a source electrode 42 of a TFT 40 are formed on the insulating film 25 . In addition, if figure 2 As shown, a gate wiring 35 is formed between the insulating film 20 and the insulating film 25 .

[0081] An inorganic insulating film 50 is formed over the entire surface of ...

Embodiment 2

[0091] image 3 and Figure 4 The liquid crystal display device of Example 2 is shown. Figure 4 represents the floor plan of a pixel, image 3 express Figure 4 The A-B cross-sectional view of a pixel is shown. Figure 4 middle, Figure 4 (a) shows a plan view from the drain line, the gate line to the pixel electrode, Figure 4 (b) shows a plan view up to the uppermost common electrode. Example 2 is an example in which most of the organic insulating film in the pixel is removed while leaving the organic insulating film on the gate wiring.

[0092] In this example, in Figure 4 In this method, the organic insulating film 55 with a film thickness of about 2 μm is patterned on the upper portion of the gate wiring 35 formed in the lateral direction, and the annealing treatment is performed to form the off angle of the end of the organic insulating film to, for example, about 40°. Spend. A transparent pixel electrode (first electrode) 60 is provided thereon so as to be el...

Embodiment 3

[0097] Figure 5 and Image 6 The liquid crystal display device of Example 3 is shown. Image 6 represents the floor plan of a pixel, Figure 5 express Image 6 The A-B cross-sectional view of a pixel is shown. Image 6 middle, Image 6 (a) shows a plan view from the drain wiring, the gate wiring to the common electrode, Image 6 (b) shows a plan view up to the uppermost pixel electrode. Example 3 is an example in which most of the organic insulating film in the pixel is removed while leaving the organic insulating film on the gate wiring.

[0098] In Example 3, such as Image 6 As shown, common electrode wiring 37 is provided in the lateral direction, and is electrically connected to the common electrode through a contact hole. In the same manner as in Example 2, an organic insulating film 55 with a film thickness of about 2 μm is patterned on top of the gate wiring 35 and annealed, whereby the inclination angle θ at the end of the organic insulating film 55 is formed...

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Abstract

A liquid crystal display device in a lateral electric field mode that improves a pixel aperture ratio and a transmittance includes: a metal wiring formed on a transparent substrate; an inorganic insulating film and an organic insulating film formed on the metal wiring; and a first transparent electrode and a second transparent electrode having a stripe slit structure formed on the inorganic insulating film and the organic insulating film so that the first transparent electrode and the second transparent electrode are opposite to each other through an interlayer insulating film, liquid crystals being driven by applying an electric field across the first electrode and the second electrode, wherein: an output from a thin film transistor is electrically connected to the first transparent electrode or the second electrode through a contact hole penetrating through the inorganic insulating film or the organic insulating film; a film thickness of the organic insulating film on the metal wiring is made thicker than a film thickness of the organic insulating film on a pixel display region including the contact hole, and a projecting portion of the organic insulating film is formed on the metal wiring; and a pixel electrode formed of the first electrode or the second electrode is formed on an image display region including a slope portion of the projecting portion.

Description

technical field [0001] The present invention relates to a transverse electric field type liquid crystal display device. Background technique [0002] Among liquid crystal display devices, in order to achieve a wide viewing angle, etc., a liquid crystal display device of the IPS (In-Plane Switching) method that uses a transverse electric field or a fringe electric field to control liquid crystal movement in a plane has been developed. [0003] In an IPS liquid crystal display device, in order to increase the aperture ratio and achieve high definition, a common electrode is formed so as to cover the data lines. However, if the data line is covered with the common electrode, there is a problem that the parasitic capacitance between the common electrode and the data line increases. [0004] Therefore, Patent Document 1 describes a liquid crystal display device including: a first substrate including thin film transistors, data lines, pixel electrodes, and a common electrode; a s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/1333G02F1/1343G02F1/1368
CPCG02F1/134363G02F1/13394G02F1/133371G02F2001/134318G02F2201/124G02F2001/133776G02F2001/13373G02F2201/40G02F2001/134381G02F2001/13606G02F1/13378G02F1/13373G02F1/133776G02F1/134318G02F1/134381G02F1/13606G02F1/1343
Inventor 富冈安松井庆枝国松登园田英博
Owner JAPAN DISPLAY INC
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