Light guide member, planar light source device provided with the light guide member, and display apparatus using the planar light source device

A technology of light guide components and display equipment, which is applied to the parts, light sources, electric light sources and other directions of lighting devices, can solve the problems of increased backlight thickness and high brightness, and achieve uniform brightness distribution, high brightness, and improved light utilization. Effect

Inactive Publication Date: 2011-04-06
SHOWA DENKO KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, even in this case, the above-mentioned means are not enough to solve the problem: the area directly above the LED lamp 206 is brighter
However, this approach results in an increased thickness of the backlight, which is not preferred for flat panel displays

Method used

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  • Light guide member, planar light source device provided with the light guide member, and display apparatus using the planar light source device
  • Light guide member, planar light source device provided with the light guide member, and display apparatus using the planar light source device
  • Light guide member, planar light source device provided with the light guide member, and display apparatus using the planar light source device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0221] Unit light-emitting devices such as figure 2 It is shown that the light emitting device mounting substrate 12 is placed in an array pattern with a width of 115 mm x a length of 135 mm, in which 1W red, green, and blue LED chips are combined to form the light emitting device 14.

[0222] A transparent plate made of acrylic resin with a width of 115 mm x a length of 135 mm and a thickness of 3 mm is used as the light guide member 16.

[0223] A hemispherical recess 20 for a light emitting device with a radius of 2.5 mm is formed on the bottom surface 18 of the light guide member 16 directly above the center of each light emitting device 14.

[0224] A white paint made of acrylic resin containing 50% of titanium dioxide (solid matter only) was coated on the bottom surface 18 of the light guide member 16 by spray coating so that the film thickness was 100 m, thereby forming the light reflecting portion 22.

[0225] In this case, the light-reflecting portion 22 is formed in a region...

Embodiment 2

[0232] According to the invention such as Figure 19 The illustrated surface light source device 10 is obtained in a manner similar to Embodiment 1, except for the following aspects.

[0233] More specifically, such as Picture 8 with Picture 9 As shown, at a position corresponding to the light emitting device 14 on the upper surface of the light guide member 16, that is, at a position directly above the light emitting device 14, a circular semi-transmissive portion 32 is further formed.

[0234] A white paint made of acrylic resin containing 50% of titanium dioxide (solid matter only) is spray-coated on the upper surface area of ​​the light guide member so that the film thickness is 20 μm, thereby forming a semi-transmissive portion 32, wherein The distance d2 from the light emitting device 14 to the outer peripheral edge of the semi-transmissive portion 32 is 5 mm.

[0235] Thus, next, similarly to Example 1, the relative brightness was measured at a distance of 0.5 mm from the po...

Embodiment 3

[0238] According to the invention such as Figure 20 The illustrated surface light source device 10 is obtained in a manner similar to Embodiment 1, except for the following aspects.

[0239] More specifically, the semi-transmissive portion 11 is formed on the concave surface of the concave portion 20 for the light emitting device.

[0240] A white paint made of acrylic resin containing 50% of titanium dioxide was applied by spraying so that the film thickness was 20 μm, thereby forming the semi-transmissive portion 11.

[0241] The range in which the translucent portion 11 is formed, that is, the projection distance d3 from the center of the light emitting device 14 to the outer peripheral edge of the translucent portion 11 is about 1.8 mm, such that Figure 20 The red, green and blue LED chips shown are basically covered.

[0242] Almost the entire surface of the bottom surface 18 of the light guide member 16 is coated with a white paint made of acrylic resin containing 50% of titani...

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Abstract

A light guide member laminated on the upper face of a luminous device mounting substrate on which a luminous device is mounted and which is for diffusing and guiding upward light emitted from the luminous device. The light guide member includes a light reflecting portion formed on the bottom face of the light guide member in an area other than an area near the luminous device, a section in which a light reflecting portion is not formed on the bottom face of the light guide member at a position near the luminous device, a concave for the luminous device in the light guide member at the position corresponding to the luminous device, and a light semi-permeable portion on a part of a surface on the concave of the concave for the luminous device and areas near around the luminous device, keeping an equal distance from the luminous device; a distance d3 from the luminous device to a peripheral edge of the light semi-permeable portion is smaller than a distance d1 from the center of the luminous device to a peripheral edge of the area near around the luminous device.

Description

[0001] This application is a Chinese patent application with the application date of November 27, 2006, the application number of 200680045124.5, and the invention titled "light guide member, surface light source device with this light guide member and display device using this surface light source device" Divisional application. [0002] Cross reference of related applications [0003] This application is an application filed under 35U.SC§111(a), which was filed on December 8, 2005 in accordance with 35U.SC§119(e)(1) in accordance with 35U.SC§111(b) Provisional application 60 / 748,191 and the provisional application 60 / 789,128 filed on April 5, 2006 are entitled to the application date. Technical field [0004] The invention relates to a light guide component, a surface light source device, and a display device using the surface light source device. Specifically, the present invention relates to: a light guide member; a surface light source device with the light guide member, the s...

Claims

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Application Information

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IPC IPC(8): F21V8/00F21V19/00F21S8/00G02F1/13357F21Y101/02
CPCG02B6/0021G02B6/0055G02B6/0068G02F1/133603G02F1/133605G02F1/133611H01L33/60
Inventor 时田孝二渡边岳男内条秀一五味秀二
Owner SHOWA DENKO KK
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