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LED with high dispersion angle and surface light source

A technology of large divergence, surface light source, applied in the field of LED and surface light source using the LED, can solve the problems of high cost, complicated processing technology of light guide plate, application limitation, etc., and achieve the effect of increasing the divergence angle

Inactive Publication Date: 2008-05-28
TIANJIN UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the well-known LED itself is a point light source with a small divergence angle. In occasions such as solid-state lighting and signal lights, the application will be limited due to reasons such as small irradiation range and glare; Surface light source has also become a difficulty in backlight technology
The usual "LED + light guide plate" mode side-lit backlight, with the increase of the size of the display screen, the brightness of a single LED is required to be higher and higher, the processing technology of the light guide plate is becoming more and more complicated, and the cost is also increasing. High, unable to compete with plasma display in terms of large-size display; and direct-type backlight, due to problems such as light uniformity, is rarely used in current liquid crystal display products

Method used

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  • LED with high dispersion angle and surface light source

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Effect test

Embodiment 1

[0016] See Figure 1. Fig. 1 shows a longitudinal sectional view of the large divergence angle LED of the present invention. The packaging structure of the large divergence angle LED of the present invention includes a reflective cup 11, an LED chip 12, electrode leads 13, an epoxy resin curing glue 14 for the chip, and a diverging lens 15 formed of commercial low-refractive-index silicone resin. The reflective cup 11 reflects the radiated light below the chip 12 to the outside of the LED. For the light emitted by the chip 12 , the refractive index of the material of the diverging lens 15 is smaller than that of the chip curing glue 14 . Thus for the light emitted by the chip 12, the area 15 is an equivalent diverging lens. The light emitted by the chip 12 passing through the diverging lens is evenly refracted toward the light-emitting surface. No fluorescent material may be added to the lens layer, or fluorescent material may be added as required. For example, the emission...

Embodiment 2

[0018] See Figure 2. FIG. 2 shows a vertical cross-sectional structure diagram of an LED of a surface light source with a concave reflector according to the present invention. The LED surface light source of the concave reflector of the present invention includes at least one LED 21 with a large divergence angle as described in Embodiment 1 of the present invention, and a concave reflector 22 . The reflective surface 22 can be designed as a paraboloid, a hyperboloid, an ellipsoid, an inner conical surface or any similar reflective surface. The divergence effect of the reflector makes the distribution of the emitted light of the diode uniform, so that the radiation intensity in the irradiation range of the light source device on this surface is more uniform and reduces the generation of glare, especially suitable for lighting places that require high uniformity of illumination in the irradiation range.

Embodiment 3

[0020] See Figure 3. Fig. 3 shows a vertical cross-sectional view of the arrayed surface light source constructed with large emission angle LEDs according to the present invention. The array type LED surface light source of the present invention has repeating units similar in structure to that of Embodiment 1 of the present invention. It includes a substrate 31, a reflective cup 32, a chip 33, a chip curing glue 34, a diverging lens 35, a reflector 36 on the side of the surface light source, and a diffusion sheet 37. The substrate 31 is in close contact with the reflective cup 32, which has the function of heat conduction; the reflective cup 32 reflects the light emitted by the chip 33 to the light-emitting surface; 34 is the curing glue near the chip, and commercial epoxy resin with a high refractive index can be used. The refractive index is about 1.7; the divergent lens 35 is made of commercial silicone resin with a low refractive index, and the refractive index is about 1...

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Abstract

The invention relates to a light emitting diode (LED) with large divergence angle and a surface light source composed of the LED, and belongs to the technical field of photoelectron. The LED with large divergence angle comprises a reflecting cup, an LED chip which is arranged in the reflecting cup and a divergence lens above the LED chip, and the components are encapsulated with resin. The divergent light with uniform distribution is formed when the divergent light of the LED chip and the reflected light out of the reflecting cup pass through the divergence lens. In the invention, the LED light source is arranged in a concave reflector, and the LED surface light source with large divergence angle and light uniformity is formed. Otherwise, the LED with large divergence angle is arrayed to form the surface light source. The reflecting cup with a plurality of light units and the chip are directly connected with the surface light source substrate. The whole divergence lens is covered above the chip, and the emission of the plane light with light uniformity is realized in virtue of the diffusion chip. The large angle LED and the surface light source of the invention can be applied to the backlight field of a lighting and liquid crystal display.

Description

【Technical field】 [0001] The invention relates to lighting and a liquid crystal display backlight source, in particular to a LED with a large divergence angle and a surface light source using the LED. 【Background technique】 [0002] Light-emitting diodes (LEDs), with their remarkable advantages such as long service life, high lumen efficiency, and low driving voltage, are gradually becoming the most powerful competitors in solid-state lighting and liquid crystal display backlight. However, the well-known LED itself is a point light source with a small divergence angle. In occasions such as solid-state lighting and signal lights, the application will be limited due to reasons such as small irradiation range and glare; Surface light source has also become a difficulty in backlight technology. The usual "LED + light guide plate" mode side-lit backlight, with the increase of the size of the display screen, the brightness of a single LED is required to be higher and higher, the ...

Claims

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Application Information

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IPC IPC(8): H01L33/00H01L25/075F21V13/00G02F1/13357F21Y105/00G02F1/1335H01L33/52
Inventor 王达健顾铁成李雪征张红梅马亮
Owner TIANJIN UNIVERSITY OF TECHNOLOGY
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