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Light emitting device

A technology of light-emitting device and light-emitting element, which is applied to lighting devices, light sources, components of lighting devices, etc., can solve the problems of high production cost and design complexity

Active Publication Date: 2009-09-02
EPISTAR CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method still needs to form many different LEDs and the corresponding circuit and mechanism design, and its manufacturing cost and design complexity are still high.

Method used

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Embodiment Construction

[0029] The present invention provides a light-emitting device that can adjust the color temperature, mainly by unevenly covering the phosphor layer on the light-emitting element, and adjusting the current input to the light-emitting element and the operation of the control unit electrically connected to the light-emitting element. Periodically modulates the color temperature of the emitted light.

[0030] Figure 1A A cross-sectional view of a light emitting device according to an embodiment of the present invention is shown. In order to simplify the drawings, some traditional packaging structures are omitted and not shown in the figure, such as the encapsulant of the light-emitting element, or the wires used to connect the light-emitting element and the external circuit. like Figure 1A As shown, a substrate 100 is included in the light emitting device 10 . The light emitting element 102 is formed on the substrate 100 . The light-emitting element 102 includes any light-emit...

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Abstract

The invention provides a light emitting device, which comprises the following components: a light emitting unit, which comprises a light emitting element and a powder layer, the light emitting element leads the light emitting unit to generate lights through the fluorescent powder layer, wherein the fluorescent powder layer unevenly covers the light emitting element; and a control unit which is electrically connected with the light emitting element and used for adjusting the input electric current intensity and the working period of the light emitting element, thus modulating the relative color temperature of the lights, wherein difference value between the largest value and the smallest value of the relative light color temperature is not smaller than 1500 K.

Description

technical field [0001] The present invention relates to a light emitting device, and in particular to a light emitting device capable of modulating color temperature. Background technique [0002] Light emitting diodes (light emitting diodes, LEDs) have many advantages such as high brightness, power saving, long service life, and low temperature. With the maturity of light-emitting diode manufacturing technology, more and more light source modules use light-emitting diodes to achieve lighting purposes, such as backlight modules for liquid crystal displays, household lights, various indicator signs, or lights for automotive lighting, etc. . [0003] In automotive lighting applications where safety is the first consideration, it is very important to timely adjust the relative color temperature of the lights to match the lighting in different environments. According to the Economic Commission of Europe (ECE) regulation R019, the color coordinates (CIE) of the white light emit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F21S2/00F21V9/08F21V23/00H05B37/02F21Y101/02F21K9/20F21Y115/10
Inventor 许嘉良刘邦彦
Owner EPISTAR CORP