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Optical member and display device

A technology for optical components and display devices, applied in optical components, optics, lighting devices, etc., can solve the problems of deterioration of backlight brightness and chromaticity, and reduction of phosphor color conversion efficiency, and achieves suppression of light loss and suppression of brightness reduction. , reduce the effect of light reflection

Active Publication Date: 2013-01-02
DEXERIALS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the color conversion efficiency of the phosphor is lowered, and the brightness and chromaticity of the backlight are deteriorated

Method used

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  • Optical member and display device
  • Optical member and display device
  • Optical member and display device

Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0027] (1) First embodiment: Example in which a phosphor layer is directly provided on the light exit surface of a diffuser plate

[0028] (2) Modification 1: An example in which a phosphor layer is directly provided on the light incident surface of a diffuser plate

[0029] (3) Modification 2: An example in which a phosphor layer is directly provided on the light exit surface of a light guide plate

[0030] (4) Modification 3: Example in which a phosphor layer is directly provided on the bottom of the light guide plate

[0031] (5) Modification 4: An example of directly providing a phosphor layer on the light incident surface (side surface) of the light guide plate

no. 2 example

[0032] (6) Second embodiment: Example of adhering a phosphor plate to the light exit surface of a diffuser plate

[0033] (7) Modification 5: Example of adhering a phosphor plate to the light incident surface of a diffuser plate

[0034] (8) Modification 6: Example of adhering a phosphor plate to the light exit surface of a light guide plate

[0035] first embodiment

[0036] 1. Structure of the display device 1

[0037] figure 1 The cross-sectional configuration of the display device 1 according to the first embodiment of the present invention is briefly shown. For example, the display device 1 is a liquid crystal display or the like, and has a display panel 20 and a light source 12 as a backlight for illuminating the display panel 20 . Between the display panel 20 and the light source 12, the diffuser plate 13 (base member), the phosphor layer 14, the protective layer 15, the diffuser film 16, the lens film 17, and the reflective polarizing film 18 are stacked in order f...

example 1

[0055] After that, as an example (Example 1) of the first embodiment described above, an experiment of degradation in phosphor layer 14 was conducted. Specifically, using a blue light-emitting diode and a diffusion plate 13 on which the phosphor layer 14 is not directly formed, the luminance efficiency was measured with respect to the water vapor transmission rate (g / m 2 / day) changes. Figure 4 The results are shown graphically. Relative values ​​in the case where a phosphor for red conversion is used as the phosphor layer 14, the initial luminous efficiency is set to 1, and the phosphor layer stays for 500 hours in an environment of 85° C. and 90% RH are illustrated, Among them, phosphors used for red conversion generally suffer from greater degradation in high temperature and high humidity environments. From Figure 4 It can be recognized that the higher the water vapor transmission rate in the diffuser plate 13 , that is, the lower the water vapor barrier property, the ...

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Abstract

An optical member realizing suppressed occurrence of a light loss between a phosphor layer performing color conversion and itself, and a display device using the same is provided. The optical member includes a base member having two opposed surfaces, and a phosphor layer provided integrally with one surface of the base member and containing a phosphor that converts a color light to another color light.

Description

technical field [0001] The present invention relates to optical components and display devices used in liquid crystal displays and the like. Background technique [0002] A liquid crystal display (LCD) is used as a thin display device. In liquid crystal displays, a backlight for illuminating the entire liquid crystal panel plane from the back is used. Liquid crystal displays are roughly classified into two types, direct emission type and edge emission type, according to the structure of the backlight. The edge light type uses a light guide plate in which light emitting elements are placed on the side. Light entering from the sides of the light guide plate is allowed to propagate in the light guide plate and is emitted from the top surface of the light guide plate. On the other hand, the direct emission type performs planar emission by, for example, disposing a plurality of fluorescent tube lamps such as CCFL (cold cathode fluorescent lamps) on a substrate (for example, se...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02F1/13357G02F1/1335F21V9/00F21Y101/02F21V9/40
CPCG02F1/133603G02B6/0038G02F2001/133614G02F1/133606G02F1/133614G02F1/1336G02B1/14
Inventor 塚原翼加濑川亮伊藤靖名田直司
Owner DEXERIALS CORP
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