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LED lens capable of being used for direct LCD backlight

A backlight, direct type technology, applied in optics, nonlinear optics, components of lighting devices, etc., can solve the problems of increasing thickness, affecting the lightweight characteristics of backlight sources, and restricting the application and development of LCD direct type LED backlight sources. Achieving the effect of high illumination uniformity

Inactive Publication Date: 2009-10-21
INST OF SEMICONDUCTORS - CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the traditional LED packaging form is used for LCD direct-type LED backlight, in order to improve the light uniformity, the light mixing height of the LED array is usually increased, and the thickness is increased, which affects the lightness of the backlight and restricts the LCD direct-type LED backlight. Application and Development

Method used

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  • LED lens capable of being used for direct LCD backlight
  • LED lens capable of being used for direct LCD backlight
  • LED lens capable of being used for direct LCD backlight

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Embodiment Construction

[0025] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in further detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

[0026] The lens shown in Fig. 4 (a) and Fig. 4 (b) is two embodiments of the present invention, is the rotation body with axisymmetric center that is made of transparent material, used material includes but not limited to cycloolefin copolymer ( COC), polymethyl methacrylate (PMMA), polycarbonate (PC) and polyetherimide (PEI). The lens index of refraction is generally between 1.4 and 1.6, but can vary slightly depending on the specific material application. Lenses can be manufactured by some mature processes, such as diamond cutting, injection molding and so on.

[0027] Figure 4(a) has four basic planes, including incident plane A1, the light beam with approximately Lambertian light intensity distribution emitted from t...

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Abstract

The invention relates to an LED lens capable of being used for a direct LCD backlight. The lens is an axial symmetry entity made of transparent materials and comprises a bottom surface, a side, an upper curved surface and a center curved surface, wherein the bottom surface is a light incident surface; the side is a light refracting interface; the upper curved surface is the light refracting interface; and the center curved surface is the light refracting interface. The lens is arranged on an LED and enables the transmission direction of light rays entering the lens to change so as to obtain good light intensity distribution and realize the uniform illumination of the LED.

Description

technical field [0001] The invention relates to an LED lens, in particular to an LED lens which can be used for a direct type LCD backlight source. Background technique [0002] Traditional cold cathode tube (CCFL) backlights for liquid crystal displays have been gradually replaced by light emitting diode (LED) backlights. However, unlike the line light source cold cathode tube, the LED is a point light source that emits a beam of light at a certain angle. When it is used as a backlight source for a direct-lit liquid crystal display (LCD), hundreds or even thousands of three primary color LEDs are required to be arranged in a certain array to form a surface light source. , and then illuminate the LCD panel. [0003] Converting from point light source to uniform surface light source is the key technology of LED backlight. The uniformity of the surface light source formed by the LED array is closely related to the light intensity distribution of the LED. Before the lens is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/13357F21V5/04G02F1/1335
Inventor 梁萌王国宏范曼宁郭德博
Owner INST OF SEMICONDUCTORS - CHINESE ACAD OF SCI
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