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LED indicating pen o f gallium nitride base

A light-emitting diode, gallium nitride-based technology, applied in the field of stylus, can solve the problems of large divergence and short transmission distance, and achieve the effects of low cost, high beam collimation and monochromaticity, and uniform brightness

Inactive Publication Date: 2008-01-02
SHANGHAI INST OF TECHNICAL PHYSICS - CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the biggest disadvantage of GaN-based light-emitting diodes is large divergence and short transmission distance. If the disadvantages can be overcome by adding some optical components through a simple method, it will have great market prospects.

Method used

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  • LED indicating pen o f gallium nitride base

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Embodiment Construction

[0017] Below combined with the accompanying drawings, the central wavelength λ 0 Taking a 550nm green light-emitting diode as an example, the specific implementation of the present invention will be described in detail. The GaN-based light-emitting diode 1 of the present invention is formed by sequentially growing an n-GaN lower electrode layer 102, an In x Ga 1-x The light-emitting layer 103 of the N / GaN quantum well structure and the p-GaN upper electrode layer 104 are formed, and the light-emitting diodes of different wavelength bands can be obtained by adjusting the composition x value of In, and the x value in this embodiment is 0.2.

[0018] Then on the upper electrode layer 104, a narrow-band filter film layer 2 is generated by vacuum coating, and the structure of the filter film layer is:

[0019] α[(LH) 12 1.6L (HL) 12 ]β[(HL) 12 2.1H(LH) 12 ],

[0020] where L is low refractive index SiO 2 film layer, H is high refractive index Ta 2 o 5 film layer, the opti...

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Abstract

The invention discloses a gallium nitride based emitting diode stylus that includes GaN based emitting diode, narrowband filtering film, and lens located at front of the filtering film. The advantage of the invention is that the light has good monochromaticity, small light spot and it could take place of laser stylus.

Description

technical field [0001] The invention relates to a stylus, in particular to a stylus using a gallium nitride-based light-emitting diode as a light source. Background technique [0002] With the advancement of science and technology and the development of society, many high-tech products have gradually entered people's daily life. The popularity of computers and projectors has made laser pointers, which are small, portable and fashionable, more and more replace traditional The pointer has a wide range of application prospects in multimedia display and other aspects. [0003] However, due to the complex structure of the laser pointer, a pump laser diode driver and a laser diode module are required, and materials such as KTP frequency-doubling crystals are also required in the laser diode module, and the cost is relatively high. In addition, limited by the technology and principle of the device, the color of the laser pointer is single. Currently, there are only two types of re...

Claims

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Application Information

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IPC IPC(8): G02B27/20G09B17/02
Inventor 陆卫王少伟夏长生李宁李志锋张波陈平平陈效双陈明法
Owner SHANGHAI INST OF TECHNICAL PHYSICS - CHINESE ACAD OF SCI