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Liquid crystal display

A liquid crystal display device and liquid crystal layer technology, which is applied in nonlinear optics, instruments, optics, etc., can solve the problems of λ/4 phase difference, poor display characteristics, and decreased reflectivity, and achieve good brightness, good color characteristics, The effect of high contrast ratio

Inactive Publication Date: 2008-01-09
HYDIS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] However, in conventional reflective liquid crystal display devices, in order to optimize the cell design, when two λ / 4 films are used, the reflectance decreases; In the area, the function of generating λ / 4 phase difference cannot be provided or realized, so there is a problem of poor display characteristics
[0014] In addition, because the existing reflective liquid crystal display device is designed to have a very small gap between the cells in order to obtain an excellent display screen, it leads to the problem of lower yield in the actual process.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] The characteristic values ​​of the components according to the first embodiment of the present invention constituting the optimal box are as follows.

example 1

[0063] The liquid crystal layer is formed of TN liquid crystal with a twist angle of 60°. When the phase retardation value of the liquid crystal layer is 0.24 to 0.27 μm, a liquid crystal display device having a large cell gap margin and excellent contrast and color characteristics can be obtained.

[0064] At this time, the orientation angle of the lower alignment film constituting the preferred cell is -10 to -20° relative to the horizontal line, the orientation angle of the upper alignment film is 40 to 55° relative to the horizontal line, and the optical axis of the λ / 4 film is 140 to 146°. °, and the absorption axis of the polarizer is 102° to 122.5°.

[0065] FIG. 2 shows an axis arrangement diagram of each constituent element. The reference symbols represent the rubbing axis of the lower substrate, i.e. the orientation angle of the lower alignment film; b represents the rubbing axis of the upper substrate, i.e. the orientation angle of the upper alignment film; c repre...

example 2

[0067] The liquid crystal layer is formed of TN liquid crystal with a twist angle of 76°. When the phase retardation value of the liquid crystal layer is 0.23 to 0.27 μm, a reflective liquid crystal display device having a large cell gap margin and excellent contrast ratio and color characteristics can be obtained.

[0068] At this time, the orientation angle of the lower alignment film constituting the optimized cell is 0-10° relative to the horizontal line, the orientation angle of the upper alignment film is 55-65° relative to the horizontal line, and the optical axis of the λ / 4 film is 160-168° , and the absorption axis of the polarizer is 117-127.5°.

[0069] FIG. 3 shows an axis arrangement diagram of each constituent element. Reference symbol a represents the rubbing axis of the lower substrate, that is, the orientation angle of the lower alignment film; b represents the rubbing axis of the lower substrate, that is, the orientation angle of the upper alignment film; c ...

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Abstract

The present invention relates to a liquid crystal display, which comprises: a lower substrate having a reflective electrode; a lower alignment film formed on the lower substrate; an upper substrate having a color filter and disposed opposite to the lower substrate; an upper alignment film formed on the upper substrate; a liquid crystal layer sandwiched between the lower and upper substrates; a phase compensation film adhered on the outer surface of the upper substrate and serving to convert linearly polarized light into circularly polarized light; and a polarizer adhered on the phase compensation film and serving to convert natural light into linearly polarized light. The lower alignment film has an alignment angle of -10 to 20 DEG with respect to a horizontal line, the upper alignment film has an alignment angle of 40 to 55 DEG with respect to a horizontal line, the liquid crystal layer has a phase delay value (dDeltan) of 0.24-0.27 mum, the phase compensation film has a phase compensation function of lambda / 4 and also has an optical axis making 140-146 DEG with a horizontal line, and the polarizer has a absorption axis making 120 to 122.5 DEG with a horizontal line. According to the present invention, the design of a liquid crystal cell can be optimized to provide a liquid crystal display having excellent display characteristics. Furthermore, cell gap can be increased to improve process margin.

Description

technical field [0001] The present invention relates to a liquid crystal display device, and in more detail, the present invention relates to a liquid crystal display device which improves display characteristics by optimizing characteristic parameters so as to improve process margin. Background technique [0002] Liquid crystal display devices are divided into a transmissive liquid crystal display device that uses a light source as a backlight, a reflective liquid crystal display device that uses natural light without a backlight, and a transmissive liquid crystal display device that selects backlight and natural light as needed. [0003] Among them, the reflective liquid crystal display device without backlight has low power consumption, is thin and light, that is to say, it can be widely used in portable display devices, making the market of mobile phones and portable devices expand and the demand gradually increases. [0004] This reflective liquid crystal display device...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/1337G02F1/1335G02F1/1333G02F1/13363
CPCG02F1/133636G02F2203/02G02F1/133541G02F1/133638
Inventor 徐东瀣朴荣一金熙哲沈桓秀李元键
Owner HYDIS TECH