Assembled uniform surface light source

A surface light source and light source technology, applied in the direction of plane light source, light source, point light source, etc., can solve the problems of reduced system efficiency, unfavorable practicality, and difficulty in uniform lighting

Inactive Publication Date: 2009-05-13
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But this will cause the scattering and absorption of light, which will reduce the efficiency of the whole system; this phenomenon is more serious when using multi-layer diffuser film
[0006] In response to this situation, US Patent US 20040080938 A1 proposes to use the reflective cup and the product BEF film of 3M Company of the United States to form a system to achieve uniform light emission in the form of direct coupling. However, this solution will form a virtual image of the LED light source on the light exit plane, which is still difficult. Uniform light emission is achieved under the premise of high efficiency; at the same time, according to our experimental results, the use of BEF film in this case will reduce the system efficiency to 60%
[0007] U.S. Patent US200

Method used

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Experimental program
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Effect test

Embodiment 1

[0051] In the surface light source assembled based on light-emitting diodes in Embodiment 1, its surface light source module includes a light uniformity-collimation mechanism, that is, a light uniformity-collimation lens 91, such as figure 2 shown. In this embodiment, the light uniformity mechanism and the collimation mechanism are integrated, that is, the light uniformity-collimation lens 91 is used to replace the functions of the light uniformity mechanism and the collimation mechanism.

[0052] figure 2 It is the cross-sectional view and light path diagram of this surface light source module. The LED light source 93 is packaged with a lens 92 . The light emitted from the LED light source 93 is refracted by the lens 92 once, and then enters the homogenizing-collimating lens 91 . The curved surface 94 makes the light with a relatively small angle with the central axis 90 evenly distributed on the spherical surface 95, and collimates and exits through the spherical surfac...

Embodiment 2

[0056] In the surface light source assembled based on light-emitting diodes in Embodiment 2, the surface light source module is another uniform light-collimation mechanism, that is, light uniform-collimator lens groups 120 and 122, such as Figure 6 shown. Here, the homogenizing-collimating lens groups 120 and 122 replace the functions of the homogenizing mechanism and the collimating mechanism. The light emitted from the LED light source 121 is uniformly and substantially collimated to the light exit plane 123 through a series of refraction and reflection on the surfaces of the lens groups 120 and 122 . This homogenization-collimation mechanism has a different form from that of Embodiment 1, but its working principle is similar, so it will not be repeated here.

[0057] The surface light source assembled from surface light source modules based on light-emitting diodes in Embodiment 2, its top view is as follows Figure 7 shown. 9 is a surface light source module, and its t...

Embodiment 3

[0059] Figure 8 It is a cross-sectional view and an optical path diagram of the surface light source module of Embodiment 3.

[0060] The dodging mechanism uses a dodging lens 23 to realize. The function of the spherical lens 22 is to encapsulate the LED light source 20 . The function of the homogenizing lens 23 is to refract the light emitted by the LED light source 20 through the ball lens 22, and then reorient it, and then undergo refraction or a series of refraction and total reflection in the homogenizing lens 23, so that it is in the surface light source module. An approximately uniform illuminance is generated on the light exit plane 12 , that is, the light is evenly distributed on the light exit plane 12 . In this embodiment, only one LED light source 20 is used, which is just for convenience of illustration, and does not limit the possibility of using multiple LED light sources.

[0061] The collimating mechanism is a collimating panel 24, the upper surface of whi...

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Abstract

A uniform surface light source which is formed by assembly belongs to the technical field of packaging and application of light-emitting diodes. The uniform surface light source is characterized in that the uniform surface light source is formed by horizontally assembling a plurality of light-emitting diode-based surface light source modules, and each surface light source module comprises a light-emitting diode light source and a uniform light-collimation optical mechanism which leads light emitted by the light-emitting diode light source to generate similar uniform illumination on an emergent plane after the refraction and/or reflection and leads the emergent direction to be parallel to the central axis of the light. The collimation mechanism is a collimation panel, the center thereof is a convex lens, the periphery is a group of prisms with cross sections which are congruent triangles, and the projections of the prisms on an orthogonal plane of the central axis are a group of concentric circles. The uniform surface light source can obtain good uniformity of emergent light under the premise of ensuring high efficiency, thereby having broad prospects in backlight sources of liquid crystal display devices which are arranged in personal computers, vehicle navigation systems, handheld telephones and other devices, lamps for ordinary indoor lighting and other application aspects.

Description

[0001] This application is a divisional application, the application number of the original application is 200610002143.1, the application date is January 19, 2006, and the title of the invention is "an assembled uniform surface light source". technical field [0002] The invention relates to an assembled light-emitting diode-based uniform surface light source, which belongs to the technical field of light-emitting diode packaging and application. The present invention is applicable to backlight sources of liquid crystal display devices installed in equipment such as personal computers, vehicle navigation systems, and hand-held phones, and is also applicable to ordinary indoor lighting lamps. Background technique [0003] At present, there are mainly two types of surface light sources based on light-emitting diodes (LEDs) that are widely used: side-light-type and directly-under-light. [0004] The side wall coupling mode refers to using some mechanism to couple the light emi...

Claims

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Application Information

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IPC IPC(8): F21V13/00F21V5/00F21V7/00F21Y101/02F21Y105/00F21Y115/10
Inventor 罗毅钱可元杨毅韩彦军
Owner TSINGHUA UNIV
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