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Liquid crystal display

A liquid crystal display device and liquid crystal layer technology, applied in the direction of instruments, polarizing elements, optics, etc., can solve the problems of rising manufacturing costs and coloring of reflective displays, and achieve the effects of simplification and reduction of manufacturing engineering, reduction of coloring, and reduction of manufacturing costs

Inactive Publication Date: 2010-12-08
SHARP KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

That is, (1) the in-cell retardation layer provided only in the in-cell reflective display area is usually made of a liquid crystal material, and therefore is affected by the wavelength dispersion of the birefringence that the liquid crystal material has, and linearly polarized light The function of converting to circularly polarized light also has wavelength dispersion, and as a result, the reflective display will be colored
As a countermeasure against this, a technique of patterning an in-cell retardation layer having an optimal retardation for each color (RGB) of the color filter substrate has been disclosed (for example, refer to Patent Documents 5 and 6). Among them, complex patterning of the embedded retardation layer is required, and the manufacturing cost increases
In addition, (2) In general, a retardation layer is also required in the transmissive display area to widen the viewing angle, and the retardation layer for the transmissive display is also embedded (in-cell ) will increase the manufacturing cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0077] figure 1 (a) is a schematic cross-sectional view showing the structure of the liquid crystal display device according to Embodiment 1 of the present invention, and (b) is a schematic perspective view.

[0078] The liquid crystal display device of the present embodiment is a transflective type (in this specification, simply referred to as a transflective type) liquid crystal display device 100 including a transmissive display region T and a reflective display region R.

[0079] Hereinafter, the transmissive display region T and the reflective display region R will be described in detail respectively.

[0080] In the transmissive display region T, a transparent electrode 7 made of a material with a high transmittance such as indium tin oxide (ITO) is provided on an insulating substrate 1 such as a glass substrate. In addition, on an insulating substrate 2 such as a glass substrate, a first retardation layer 3 formed of a material such as a polymer liquid crystal substan...

Embodiment 1

[0084] figure 2 (a) is a schematic cross-sectional view showing the structure of Embodiment 1 of the present invention, and (b) is a schematic perspective view showing the arrangement relationship of various structural components.

[0085] (Fabrication of TFT substrate)

[0086] On a transparent and non-birefringent glass substrate 1a, a plurality of gate lines and source lines are provided so as to extend mutually in two directions perpendicular to each other, and TFT elements are provided at intersections thereof. Next, a transparent electrode 7a for transmissive display and a reflective electrode 5a for reflective display are provided, each connected to the drain of the TFT element, and finally a vertical alignment film is applied on the entire surface to complete the TFT substrate. In addition, since the TFT substrate was fabricated using a conventionally known method, detailed description thereof will be omitted. In addition, illustration is omitted except for the glas...

Embodiment 2

[0111] image 3 It is a schematic cross-sectional view showing the structure of the liquid crystal display device according to Embodiment 2 of the present invention, and (b) is a schematic perspective view showing the arrangement relationship of various structural components.

[0112] A liquid crystal display device similar to that of Example 1 was fabricated as a liquid crystal display device 100b of Example 2 except that the azimuth angle of the in-plane slow axis s of the second retardation layer 6b was changed to -30°.

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Abstract

A semi-transmission type liquid crystal display capable of performing both high-definition reflection display and transmission display while minimizing elevated manufacturing cost in a simple manufacturing process is provided. The semi-transmission type liquid crystal display which is in a vertical orientation mode comprises a liquid crystal cell having a rear polarizer, a pair of substrates, and a liquid crystal layer interposed between the pair of substrates and an observation polarizer whose absorption axis crosses at right angles to the absorption axis of the rear polarizer and performs the transmission display and the reflection display. The transmission display area and the reflection display area have a first retardation layer which satisfies 1.5 = Nz = 9.0, the in-plane slow axis of which crosses at right angles to the absorption axis of the observation polarizer, and which satisfies 20 nm = Re(550) = 80 nm between the liquid crystal layer and the observation polarizer. The transmission display area has a second retardation layer for converting the linearly polarized light entering from the observation polarizer when no voltage is applied into circularly polarized light together with the first retardation layer between the first retardation layer and the observation polarizer.

Description

technical field [0001] The present invention relates to a liquid crystal display device. More specifically, it relates to a transflective liquid crystal display device suitable for mobile devices such as mobile phones. Background technique [0002] Liquid crystal display devices are widely used as display devices for various electronic devices including mobile phones, computers, and televisions. In particular, TFT liquid crystal display devices (hereinafter also referred to as "TFT-LCD") are widespread, and further expansion of the market and further improvement in image quality are expected. In addition, in recent years, demand for mobile devices such as mobile phones has rapidly increased, and reflective liquid crystal display devices that can achieve lower power consumption than transmissive liquid crystal display devices have attracted attention. [0003] This reflective liquid crystal display device reflects the incident light from the outside on the reflective plate ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/1335G02B5/30G02F1/13363
CPCG02B27/286G02F2413/09G02F2413/02G02F1/133555G02B5/3083G02F1/13363G02F2001/133565G02F1/133565G02F1/133631
Inventor 坂井彰津田和彦
Owner SHARP KK