Assembled uniform area light source

A surface light source and light source technology, applied in optics, optical components, nonlinear optics, etc., can solve problems such as unfavorable practicality, difficulty in uniform light emission, and reduced system efficiency

Inactive Publication Date: 2006-10-11
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
[0005] 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%
[0006] U.S. Patent US20050013131A1 and Chinese Utility Model Patent 03264908.8 respectively mention the purpose of covering the reflector directly above the light source to achieve uniform light output, but from the simulation results disclosed by the former, the uniformity has been improved, but still not less than 40%
At the same time, the light in this method is mainly concentrated in the direction with a relatively large angle with the normal of the light exit plane after exiting, which is not conducive to practical use.
[0007] To sum up, the existing surface light source is difficult to solve the contradiction between uniformity and efficiency, especially for the direct coupling method applied to large-area surface light source, the uniformity can only be obtained by sacrificing efficiency

Method used

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Experimental program
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Effect test

Embodiment 1

[0050] 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.

[0051] 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

[0055] 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.

[0056] 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

[0058] Figure 8 It is a cross-sectional view and an optical path diagram of the surface light source module of Embodiment 3.

[0059] 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.

[0060] The collimating mechanism is a collimating panel 24, the upper surface of whi...

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Abstract

The invention discloses an assembled uniform surface light source, belonging to the packing technique of light-emitting diode. It is characterized in that: it is a surface light source formed by assembling several surface light source modules that based on light-emitting diode. Wherein, each surface light source module comprises light-emitting diode light source, and a light-average collimate optical device which can make the light of light-emitting diode light source, via reflect and / or refract to generate uniform luminance on the emit plane while the emit direction is parallel with the middle axis of light. The invention can attain better light uniformity with high efficiency, while it can be used as a back light source in the personal computer, vehicle navigation system, etc.

Description

technical field [0001] 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 [0002] 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. [0003] The side wall coupling mode refers to using some mechanism to couple the light emitted by the light emitting diode into the light guide plate from the side, so as to form a uniform surface light source. During the transmission of light in the light guide plate, it will gradually weaken due to the exit and material loss, so th...

Claims

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Application Information

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IPC IPC(8): G02F1/13357H01L33/00G02B27/00G02F1/1335H01L33/58
Inventor 罗毅钱可元杨毅韩彦军
Owner TSINGHUA UNIV
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