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Backlight and display

A technology of a backlight device and a spatial light modulator, which is applied to lighting devices, instruments, optics, etc., can solve the problem that the output light is not enough to be used directly with the panel 1, and achieves good viewing angle performance, thickness and cost reduction, and low cost. Effect

Inactive Publication Date: 2009-09-23
SHARP KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The problem with large variations in feature size is that the features must be individually cut differently during the manufacturing process
The feature 10 is usually arranged to provide a fairly uniform light output from the front surface, but the uniformity of the output light in the proper direction is usually not sufficient for use directly with the panel 1, so that a diffuser 7 and enhancement films 8 and 9 are necessary

Method used

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  • Backlight and display
  • Backlight and display
  • Backlight and display

Examples

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Embodiment Construction

[0066] image 3 Shows a display which is connected to figure 1 The main difference in the display shown is that the display is not flat. Specifically, in this embodiment, the display is bent around a single axis perpendicular to the plane of the drawing. Therefore, the LCD 1 has a cylindrically curved output surface and has a substantially constant thickness. The input and output polarizers 2 and 3 are bent accordingly, as are the light guide 4, reflector 6, diffusion device 7, and enhancement film 8. image 3 Another difference of the display is that the diffuser 7 is more figure 1 The diffusing device required in this is a weak diffusing device, and only a single-piece enhancement film 8 is required. In addition, image 3 The structure of the light guide 4 and figure 1 The structure shown is different. The display is concave because the image plane is concave when viewed from the viewing area in front of the display.

[0067] Such as image 3 As shown in an enlarged scale, t...

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PUM

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Abstract

A backlight is provided for a transmissive spatial light modulator such as a liquid crystal device (1). The backlight comprises a light source (5), which supplies light through an input edge surface (12) of a non-flat light guide (4) having a front surface (4a) and a rear surface (4b). The rear surface (4b) comprises a plurality of concave features (10), each of which has a surface (11) which faces the input surface (12) and which is oriented so as to direct light towards and out of the front surface (4a). The surfaces (11) have slope angles with respect to a tangent plane to the rear surface (4b) at the feature (10) which vary with distance from the input surface (12) so as to concentrate output light from the light guide (4) into a desired angular output range.

Description

Technical field [0001] The invention relates to a backlight device for at least partially transmissive spatial light modulators. The present invention also relates to a display including the backlight device. Background technique [0002] US4616295 (Hewlett Packard) describes a basic light guide for display lighting ( figure 1 ). It includes a flat light guide with two fluorescent tubes installed, one at each end. The light guide has a "frosting" through which light is coupled to the outside. The document does not disclose the nature of the "frosted surface". [0003] US6904225 (Nichia) describes a pattern of features that prevent total internal reflection in a light guide. This pattern is dedicated to point light sources that are not uniformly illuminated along the edges, such as LEDs. This pattern increases the feature density between the LEDs and reduces the feature density near the LEDs to improve uniformity. [0004] JP2006 / 066282 (Sharp) describes a flat light guide with f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F21V8/00G02F1/13357F21Y101/02
CPCG02B6/0018G02B6/0038
Inventor 大卫·詹姆斯·蒙哥马利弗洛里安·吉勒斯·皮埃尔·罗卡尔
Owner SHARP KK