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Liquid crystal display

By optimizing the characteristic values ​​of the components of the liquid crystal display device, the deficiencies in the display characteristics and process margin of the reflective liquid crystal display device are solved, the display effect of high reflectivity and high contrast is achieved, and the process margin is improved.

Inactive Publication Date: 2010-02-17
HYDIS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] 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
[0015] In addition, because the existing reflective liquid crystal display device is designed to have a very small gap 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

[0062] The characteristic values ​​of the components according to the first embodiment of the present invention constituting the preferred cartridge are as follows.

example 1

[0064] 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.

[0065] At this time, the alignment angle of the lower alignment film constituting the preferred cell is -10 to -20° with respect to the horizontal line, the alignment angle of the upper alignment film is 40 to 55° with respect 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°.

[0066] figure 2 An axis arrangement diagram of each constituent element is shown. Reference numerals indicate the rubbing axis of the lower substrate, that is, the orientation angle of the lower alignment film; b indicates the rubing axis of the upper substrate, that is, the orientation angle of the upper alignment fi...

example 2

[0068] The liquid crystal layer was 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.

[0069] At this time, the alignment angle of the lower alignment film constituting the optimized cell is 0 to 10° with respect to the horizontal line, the alignment angle of the upper alignment film is 55 to 65° with respect to the horizontal line, and the optical axis of the λ / 4 film is 160 to 168° , and the absorption axis of the polarizer is 117 to 127.5°.

[0070] image 3 An axis arrangement diagram of each constituent element is shown. Reference symbol a denotes the rubbing axis of the lower substrate, that is, the orientation angle of the lower alignment film; b denotes the rubbing axis of the lower substrate, that is, the orientation angle of the upper a...

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PUM

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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. Accordingto 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 toimprove process margin.

Description

[0001] This application is a divisional application of Chinese Patent Application No. 03132781.8 with the filing date of August 1, 2003 and the invention title "Liquid Crystal Display Device". technical field [0002] The present invention relates to a liquid crystal display device, and more particularly, the present invention relates to a liquid crystal display device that improves display characteristics by optimizing characteristic parameters, thereby improving process margins. Background technique [0003] Liquid crystal display devices are classified into a transmissive liquid crystal display device that uses a light source as a backlight, a reflective liquid crystal display device that does not use a backlight, a reflective liquid crystal display device that uses natural light, and a transmissive liquid crystal display device that selects backlight and natural light as needed. [0004] Among them, the reflective liquid crystal display device without backlight has low po...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02F1/1337G02F1/13363G02F1/1333
CPCG02F1/133636G02F2203/02G02F1/133541G02F1/133638
Owner HYDIS TECH CO LTD