Reflecting plate and liquid crystal display apparatus

A technology of liquid crystal display devices and reflectors, which is applied in optics, instruments, nonlinear optics, etc., can solve the problems of reduced reflectivity and achieve the effect of improving reflectivity

Inactive Publication Date: 2008-04-23
ALPS ALPINE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, although this method increases the peak reflectivity, the scattering range shrinks around the normal reflection angle
Therefore, there is a problem that the reflectance at angles mainly used by observers (users of small portable devices, etc.) decreases, and only limited incident light can be used for illumination.

Method used

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  • Reflecting plate and liquid crystal display apparatus
  • Reflecting plate and liquid crystal display apparatus
  • Reflecting plate and liquid crystal display apparatus

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Embodiment Construction

[0022] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

[0023] If the scattering range is expanded around the regular reflection angle, the overall reflectivity will be improved to a certain extent. Therefore, although the reflectance at the observation angle (the angle deviated from the regular reflection angle by about 0° to 20°) increases to a certain extent, the reflectance near the regular reflection angle also increases to a certain extent. As a result, reflections (ぎ らつき) and mirror images (扬り込み) are generated near the regular reflection angle, reducing the visibility of the observer.

[0024] The inventors of the present invention aimed at reducing the visibility caused by the reflection and mirror image caused by the relatively high reflectance near the regular reflection angle, and increased the reflectance at the viewing angle by reducing the reflectance near the regular reflection angle, that is, by Th...

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Abstract

A reflecting plate and a liquid crystal display device using the reflecting plate are provided capable of diffusing an incident light beam coming from a wide range of angles in a uniform manner while increasing the reflectivity at a main viewing angle. The concave portion has a substantially oval shape in plan view. Namely length L2 is set longer than L1. In addition, the concave portion is at the section of L1 side, the minimum tilt angle of the bottom surface of the concave portion with respect to the level plane is in the range from greater about 0 to about 7.5 degrees, perferred about 5 degree. The minimum tilt angle of the bottom surface of the concave portion of L2 side of with respect to the level plane is 0 degree.

Description

technical field [0001] The present invention relates to a reflective plate used in reflective or semi-projective liquid crystal display devices. Background technique [0002] Conventionally, liquid crystal display devices have generally been used as display components for small portable devices such as mobile phones, PDAs (Personal Digital Assistants), electronic dictionaries, and notebook computers (see, for example, Patent Document 1). Among them, a reflection type or semi-projection type liquid crystal display device is provided with a reflection plate (referred to as a "reflector" in Patent Document 1) for displaying by reflecting light incident from the display surface side. The reflector makes the light scattered symmetrically around the center of the regular reflection angle (the liquid crystal display panel is arranged in the front viewing direction, and the reflection angle when the light enters the liquid crystal display panel, the incident angle of the light sourc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/10G02F1/1335
CPCG02B5/0215G02F1/133553G02B5/0284G02B5/0257
Inventor 吉井克昌千喜良知惠
Owner ALPS ALPINE CO LTD
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