Assembled uniform surface light source

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...

AI Technical Summary

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 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.

[0008] 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

Images