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Liquid crystal display device

A technology of liquid crystal display device and liquid crystal layer, which is applied in the direction of static indicators, nonlinear optics, instruments, etc., and can solve the problems of large thickness deviation of columnar spacers, deviation of resin film thickness, and degradation of display quality of liquid crystal display devices, etc. , to achieve the effects of less gap unevenness, reduced film thickness deviation, and superior display quality

Inactive Publication Date: 2008-01-02
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Variations in gaps in the transmissive display area can be recognized with the naked eye as display unevenness in the transmissive display mode, but the display quality of liquid crystal display devices has a problem that the transmissive display mode is important
[0009] In addition, in the case where a columnar spacer is formed on a protrusion on the same substrate, there is a problem that when spin coating is used to coat the resin film constituting the columnar spacer, the thickness of the resin film on the protrusion will be reduced. The film thickness is not only dependent on the physical properties such as the viscosity of the resin film, but also is affected by the step difference or the area of ​​the protrusions. Therefore, the film thickness of the resin film tends to vary compared to a flat substrate on which no protrusions are formed.
As a result, the film thickness variation of the columnar spacers in the reflective display area becomes large, and gap unevenness occurs not only in the transmissive display area but also in the reflective display area. The display quality of the liquid crystal display device is significantly reduced
[0010] On the other hand, when the protrusion and the columnar spacer are formed on different substrates, the film thickness of the columnar spacer is not affected by the protrusion. The alignment accuracy of the protrusion and the column spacer sometimes becomes a problem if the end of the part is close

Method used

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Examples

Experimental program
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Effect test

no. 1 approach

[0044] FIG. 1 is a plan view showing the outline of the liquid crystal display device in the first embodiment of the present invention. 2 is a plan view showing a pixel of the liquid crystal display device in the first embodiment, and FIG. 3 is a cross-sectional view of the pixel in FIG. 2 taken along the II-II section. In addition, in the following drawings, the same reference numerals denote the same or equivalent parts.

[0045] In FIG. 1, a liquid crystal panel 50 is composed of a color filter substrate 1 as a first substrate and an array substrate 10 as a second substrate that sandwich a liquid crystal layer 5. The display unit 30 is composed of a plurality of pixels 40 arranged in a matrix. A display portion peripheral light shielding film 70 is formed on the outer periphery of the display portion 30, and a sealing portion 35 in which a sealing material for sealing the liquid crystal layer 5 is formed is provided in the display portion peripheral light shielding film 70 area...

no. 2 approach

[0080] In the first embodiment, the case where the columnar spacer 6 is formed on the colored layer 2 where the protrusion 3 is not formed is described. However, as shown in FIG. The area where the colored layer 2 is formed forms a columnar spacer 6. Here, the colored layers 2R, 2G are not partially formed in the regions where the light-shielding films 7R, 7G are formed in the boundary portions of the left and right adjacent pixels 40R, 40G. In addition, the regions where the colored layers 2R, 2G, and 2B are not formed extend in stripes up and down. The columnar spacer 6 is formed in the area where the colored layers 2R and 2G are not formed. In addition, the columnar spacer 6 is arranged substantially in the center between the ends of the protrusions 3 of the pixels 40R and 40G adjacent to each other in the vertical direction.

[0081]In this embodiment, the columnar spacer 6 is arranged at the boundary between the pixels 40R and 40G adjacent to the left and right. However, the ...

no. 3 approach

[0083] In the first and second embodiments, as shown in FIGS. 2 and 5, the protrusions 3 formed on the color filter substrate 1 are formed as island-shaped isolated patterns in each pixel 40, but as As shown in FIG. 6, it may be formed in a stripe shape continuous through a plurality of pixels 40R, 40G, and 40B. Here, the transmissive display area T where the protrusion 3 is not formed at the boundary of the left and right adjacent pixels 40R and 40G, and the columnar spacer 6 is formed in the area where the light-shielding films 7R and 7G are formed. In addition, the columnar spacer 6 is arranged substantially in the center between the ends of the protrusions 3 of the pixels 40R and 40G adjacent to each other in the vertical direction.

[0084] In this embodiment, since the columnar spacer 6 is formed in the transparent display area T where the protrusion 3 is not formed, the gap dt of the transparent display area T is not affected by the step difference of the protrusion 3 or th...

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Abstract

A liquid crystal display device includes: a liquid crystal layer interposed between a first substrate and a second substrate; a columnar spacer holding the liquid crystal layer; and a plurality of pixels arranged in matrix which constitutes a display unit, wherein: each of the pixels has a first display region and a second display region; the first display region has the liquid crystal layer thinner than the second display region; a protrusion portion is formed in the first display region of the first substrate; and the columnar spacer is formed only in the second display region in which the protrusion portion is not formed.

Description

Technical field [0001] The present invention relates to a liquid crystal display device, which can be suitably used, for example, in a semi-transmissive liquid crystal display device. Background technique [0002] Liquid crystal display devices have the characteristics of thinness, light weight, and low power consumption, and are used in display devices of many devices. In particular, portable information devices such as mobile phones use semi-transmissive liquid crystal display devices, which can realize two modes, a reflective display mode using external light and a transmissive display mode using backlight. It can be displayed well in the dark outside light and in the dark room. [0003] The semi-transmissive liquid crystal display device is composed of a liquid crystal panel, a backlight, and the like that sandwich liquid crystal between a pair of substrates. The display area of ​​the pixels arranged in a matrix forming the display portion is composed of a reflective display ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/1339G02F1/133
CPCG02F1/133371G02F1/13394G02F1/133555G02F1/1339G02F1/1345
Inventor 小山均
Owner MITSUBISHI ELECTRIC CORP
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