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Liquid crystal display having a black matrix layer

a liquid crystal display and matrix layer technology, applied in the direction of identification means, instruments, optics, etc., can solve the problems of narrow material selection range, unwanted deterioration of display quality, and disturbance of electric field in the lateral direction, and achieve the effect of large resistance value, large margin, and no noticeable rise in luminance at displaying black

Inactive Publication Date: 2005-06-23
NEC LCD TECH CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This solution effectively suppresses the development of unwanted vertical electric fields, maintaining low luminance at black display and enhancing contrast, while providing a larger tolerance for the specific resistance of the black matrix layer and color layers, thus improving display quality and material selection margins.

Problems solved by technology

Consequently, a charge distribution within the color filter is changed by an electric field applied to the liquid crystal, and an electric field is developed in the vertical direction, which disturbs the electric field in the lateral direction.
Such disturbance of the electric field causes unwanted deterioration of the display quality, such as cross talks or image persistence.
Also, there is a problem that a range of material selection is narrowed if the specific resistance is increased.

Method used

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  • Liquid crystal display having a black matrix layer
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  • Liquid crystal display having a black matrix layer

Examples

Experimental program
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first embodiment

[0043] In the first place, a manufacturing method of an IPS mode liquid crystal display in accordance with the first embodiment will be explained.

[0044] After a metal layer, which will be made into gate lines 6, common electrodes 2, and common electrode lines 2a, is deposited over a transparent substrate 1 for a TFT substrate 21, the metal layer is patterned into a predetermined shape. Then, a gate insulation film 7 is deposited on the metal layer, and an amorphous silicon film and an n+ amorphous silicon film are deposited in succession. Then, the amorphous silicon film and n+ amorphous silicon film are patterned into an island shape, thereby forming a TFT 4 region. Then, a contact region (not shown), in which a metal layer connected to the gate line 6 and common electrode line 2a is buried, is formed in a predetermined region in the gate insulation film 7. Then, a metal layer, which will be made into the drain line 5- and pixel electrode 3, is deposited and patterned into a predet...

second embodiment

[0065] The second embodiment includes a structure suitable to such a driving method by dot inversion (pixel inversion). In the present embodiment, because the color layer 12 is formed above the drain line 5, the charges may be injected into the color layer 12 by a voltage applied to the drain line 5. On the other hand, by applying the voltages of opposite polarities to the odd-numbered drain lines 5 and even-numbered drain lines 5, respectively, while applying the voltages of opposite polarities 25 to the odd-numbered gate lines 6 and even-numbered gate lines 6, respectively, charges of opposite polarities are injected into each adjacent pair of the color layers 12, respectively. In the present embodiment, because the color layers 12 are formed so that each adjacent pair of the color layers 12 overlap at their respective end portions, the color layers 12 respectively injected with the charges of opposite polarities are connected to each other, and therefore, the charges injected to ...

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Abstract

A first substrate, a second substrate opposing to the first substrate, and liquid crystal provided in a space between the first substrate and second substrate are provided to an IPS mode liquid crystal display. A plurality of gate lines and a plurality of drain lines, thin film transistors, pixel electrodes, and common electrodes are formed on a transparent substrate in a first substrate. Each of the thin film transistors is provided in a vicinity of the intersection of the gate line and drain line. Each of the pixel electrodes is formed within a pixel region enclosed with an adjacent pair of the gate lines and an adjacent pair of the drain lines. Each of the common electrodes develops an electric field within each of the pixel regions between the pixel electrode and itself. The second substrate includes color layers provided for each of the pixel regions. The color layers are spaced apart from the gate lines and drain lines when seen on a plane.

Description

BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention relates to an IPS (In-Plane Switching) mode liquid crystal display which rotates liquid crystal in a plane substantially parallel to a TFT substrate by applying a voltage across a pixel electrode and a common electrode formed in the TFT substrate, and more particularly to a liquid crystal display achieving enhanced contrast. [0003] 2. Description of the Related Art [0004] In an active matrix type liquid crystal display, for example, thin film transistors (TFTs) are employed as pixel switching elements. Also, the active matrix type liquid crystal display attains a satisfactory image quality. For this reason, the active matrix type liquid crystal display is employed extensively as a monitor of a space-saving type desktop computer or the like. Generally, a liquid crystal display includes two operating modes: the twisted nematic (TN) mode, by which directors of aligned liquid crystal molecules are ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): G02F1/133G02F1/1335G02F1/1343G02F1/1345G02F1/136G02F1/1368G09F9/30G09G3/20G09G3/36
CPCG02F1/133512G02F1/1345G02F1/134363G02F1/133514G02F1/1343
Inventor SHIBAHARA, HIDEOMATSUMOTO, KIMIKAZU
Owner NEC LCD TECH CORP
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