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Liquid crystal display with wide angle of field

A liquid crystal display and display technology, applied in static indicators, instruments, optics, etc., can solve problems such as the narrow viewing angle range of TN or STN liquid crystal displays

Inactive Publication Date: 2004-08-11
CASIO COMPUTER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, TN or STN liquid crystal displays have a narrow range of viewing angles, that is, viewing angles that can be observed with satisfactory display contrast

Method used

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  • Liquid crystal display with wide angle of field
  • Liquid crystal display with wide angle of field
  • Liquid crystal display with wide angle of field

Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0057] Figure 1 to 15 This shows the first embodiment of the present invention. figure 1 It is an exploded perspective view of a liquid crystal display. figure 2 It is a partial cross-sectional view of a liquid crystal display.

[0058] Such as figure 1 with 2 As mentioned, the liquid crystal display of this embodiment has a liquid crystal cell 1 and front and rear polarizing plates 11 and 12 sandwiching the liquid crystal cell 1. The first retardation film 13 is inserted between the liquid crystal cell 1 and the front polarizing plate 11. The second retardation film 14 is inserted between the liquid crystal cell 1 and the rear polarizing plate 12. The third retardation film 19 is interposed between the first retardation film 13 and the adjacent front polarizing plate 11.

[0059] In the liquid crystal cell 1, a nematic liquid crystal layer 9 is formed between a pair of transparent substrates 2 and 3 on the front and rear sides, and the pair of substrates are connected by a f...

no. 2 example

[0207] Figure 17 It is an exploded perspective view of a liquid crystal display according to the second embodiment of the present invention. In this embodiment, the third retardation film 19' is inserted between the second retardation film 14 and the adjacent rear polarizing plate 12. This liquid crystal display is different from the liquid crystal display of the first embodiment only in the insertion position of the third retardation film 19'. The same reference numerals are used for the same parts of the second embodiment as in the first embodiment, and detailed descriptions thereof are omitted.

[0208] In the liquid crystal display of the second embodiment, the collimation processing directions 2a and 3a of the front substrate 2 and the rear substrate 3 of the liquid crystal cell 1, the twist angle of the liquid crystal molecules, the refractive index of the first retardation film 13 and the second retardation film 14 The reduced axial direction N and the directions of the a...

no. 3 example

[0216] Figure 18 Shows an exploded perspective view of a liquid crystal display according to the third embodiment of the present invention. In this embodiment, the third retardation films 19 and 19' are inserted between the first retardation film 13 and the front polarizing plate 11 and between the second retardation film 14 and the rear polarizing plate 12, respectively. This liquid crystal display is different from the liquid crystal display in the first embodiment only in the insertion position of the third retardation film 19'. In this embodiment, the same parts as those in the first embodiment are denoted by the same reference numerals, and detailed descriptions are omitted here.

[0217] In the liquid crystal display of the third embodiment, the collimation processing directions 2a and 3a of the front substrate 2 and the rear substrate 3 of the liquid crystal cell 1, the twist angle of the liquid crystal molecules, the refractive index of the first retardation film 13 and ...

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Abstract

In a liquid crystal display having a wide viewing angle range, first and second retardation films each having negative optical anisotropy in which the refractive index in the axial direction tilted in a predetermined direction with respect to the normal line to the film plane are inserted between a liquid crystal cell including a pair of substrates and a front polarizer and between the liquid crystal cell and a rear polarizer, respectively, such that the direction components along the film planes of the axial directions are set along the aligning treatment directions of the liquid crystal cell. A third retardation film having refractive index anisotropy in the film plane is arranged between the first retardation film and the adjacent front polarizer such that the maximum refractive index direction in the film plane becomes parallel or perpendicular to the absorption axis of the front polarizer. The retardation difference generated by light that becomes incident on the liquid crystal display obliquely with respect to the normal direction is compensated by the third retardation film. Residual retardation in liquid crystal molecules near the substrate of the liquid crystal layer is compensated by the first and second retardation films. Hence, high-contrast display at a wide viewing angle can be obtained independently of the incident angle.

Description

[0001] This application is based on the Japanese patent application JP11-185974 filed on June 30, 1999 and claims the priority of the patent. The content of the application is hereby incorporated by reference. Technical field [0002] The invention relates to a liquid crystal display with a wide viewing angle. Background technique [0003] Traditional liquid crystal displays generally use TN (twisted nematic) or STN (super twisted nematic) devices. [0004] These liquid crystal displays all include a liquid crystal cell with a liquid crystal layer. The liquid crystal molecules in the cell are twisted at a predetermined twist angle between a pair of transparent substrates on the front and rear sides. There are transparent electrodes on the inner surface of each transparent substrate. A pair of front and rear polarizers sandwiched in a liquid crystal cell. [0005] However, TN-type or STN-type liquid crystal displays have a narrow viewing angle range, that is, viewing angles with sa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G09F9/00G02F1/133G02F1/1335G02F1/13363
CPCG02F1/133632G02F1/133634G02F2413/105G02F1/133
Inventor 坂本克仁
Owner CASIO COMPUTER CO LTD