Liquid crystal display

A liquid crystal display, technology of liquid crystal molecules, used in static indicators, instruments, nonlinear optics, etc.

Active Publication Date: 2012-03-14
SHANTOU GOWORLD DISPLAY (PLANT II) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] There are many working modes for liquid crystal display, among which super twisted nematic liquid crystal display (Super Twist Nematic Liquid Crystal Display, referred to as STN-LCD) mainly utilizes liquid crystal molecules The super-twisted birefringence effect is used to realize the display. This mode has serious dispersion phenomenon. When used as a negative display in a normally black state, it is impossible to obtain a background color without color cast, and there are disadvantages such as slow response speed and insufficient viewing angle; distortion Nematic liquid crystal display (that is, Twist Nematic Liquid Crystal Display, referred to as TN-LCD) mainly uses the optical rotation effect of liquid crystal molecules to realize display. When this mode is used as a negative display with black background and white characters, there is relatively large black state light leakage. , which has a low contrast

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0038] This liquid crystal display can be driven actively or passively. The display area of ​​the liquid crystal display includes several pixels or segments, which are the smallest unit for controlling light in the liquid crystal display, and the area in the pixels or segments that can control the on-off of light on the plane of the liquid crystal display is called the active area. The section of the active area has the above-mentioned upper polarizer 8, upper transparent substrate 1, upper electrode 4, upper alignment layer 5, negative liquid crystal layer 3, lower alignment layer 7, lower electrode 6, lower transparent substrate 2 and The layered structure formed by the lower polarizer 9.

[0039] Both the upper electrode 4 and the lower electrode 6 are thin films made of a light-transmitting conductive material (such as ITO), and are respectively attached to the inner surfaces of the upper transparent substrate 1 and the lower transparent substrate 2 .

[0040] The upper p...

Embodiment 2

[0051] Example 3

[0052] This embodiment is further improved on the basis of the liquid crystal display of embodiment 1, 2, and the liquid crystal display adopts the following drive mode (this drive mode is called the jitter drive mode, refer to image 3 ): by controlling the periodic change of the driving signal, the inclination angle of the liquid crystal molecules 31 in the negative liquid crystal layer 3 is periodically changed within a certain range (ie Δα), that is, the liquid crystal molecules 31 are within a certain angle range (ie Δα ) oscillates periodically.

Embodiment 3

[0054] Assuming that the tilt angle of the liquid crystal molecules 31 is at α 1 、α 2 between changes (that is, liquid crystal molecules 31 at a tilt angle of α 1 、α 2 oscillating constantly), and there is α 1 >α 2 , swing amplitude Δα=α 1 -α 2 , then the characteristics of the driving signal waveform of the jitter drive are: periodic waveform, each cycle (called the jitter cycle) contains T 1 , T 2 Two paragraphs, where T 1 The effective value of the driving voltage of the segment is V eff1 ,T 2 The effective value of the driving voltage of the segment is V eff2 , with V eff2 eff1 , V eff2 The optimal value can be taken as zero; T 1 for the V eff1 Under the action of liquid crystal molecules 31 by α 1 change inverted alpha 2 time, T 2 for the V eff2 Under the action of liquid crystal molecules 31 by α 2 revert to alpha 1 time. So T 1 , T 2 By the coefficients of elasticity and viscosity of the negative liquid crystal layer 3, and the voltage V eff1 , T...

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Abstract

The invention relates to a liquid crystal display which comprises an upper transparent substrate, a lower transparent substrate and a negative liquid crystal layer, wherein the internal side surface of the upper transparent substrate is provided with an upper electrode, and the internal side surface of the upper electrode is provided with an upper alignment layer; the internal side surface of thelower transparent substrate is provided with a lower electrode, and the internal side surface of the lower electrode is provided with a lower alignment layer; the negative liquid crystal layer is arranged between the upper alignment layer and the lower alignment layer; and pretilt angles of liquid crystal molecules in the negative liquid crystal layer range from 70 degrees to 89 degrees. When an electric field is instantaneously added to the liquid crystal display, the tilt directions of all liquid crystal molecules keep consistent, therefore, the liquid crystal molecules are quite stable in the tilting process and high in response speed. A preferable scheme is as follows: the contrast of the liquid crystal display can be improved through the arrangement of compensation membranes. A jitter-driven mode is preferably adopted, thereby dispersing and weakening blind areas. In the preferable scheme, active areas of the liquid crystal display are divided into a plurality of orienting areas,at least two orienting areas of the liquid crystal molecules exist in the active areas, and the orienting directions of the orienting areas are different from each other so that the visual angle uniformity of the liquid crystal display is further improved.

Description

technical field [0001] The invention relates to a liquid crystal display. Background technique [0002] There are many working modes for liquid crystal displays, among which super twisted nematic liquid crystal display (Super Twist Nematic Liquid Crystal Display, referred to as STN-LCD) mainly uses the super twisted birefringence effect of liquid crystal molecules to realize the display, this mode has serious problems Dispersion phenomenon, when used as a negative display in a normally black state, it is impossible to obtain a background color without color cast, and there are disadvantages such as slow response speed and insufficient viewing angle; twisted nematic liquid crystal display (ie Twist Nematic Liquid Crystal Display, referred to as TN -LCD) mainly uses the optical rotation effect of liquid crystal molecules to realize the display. When this mode is used as a negative display with black background and white characters, there is relatively large black state light ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02F1/1333G02F1/13363G02F1/133
Inventor 李永忠吕岳敏黄晓炀吴永俊纪伟丰沈奕黄琛
Owner SHANTOU GOWORLD DISPLAY (PLANT II) CO LTD
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