Light-emitting device and method for adjusting light intensity of light-emitting device

A technology for a light-emitting device and a light-emitting unit, which is applied to lighting devices, fixed lighting devices, components of lighting devices, etc., can solve problems such as inconvenience in use and changing the luminous intensity of LEDs.

Inactive Publication Date: 2011-11-16
HONG FU JIN PRECISION IND (SHENZHEN) CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In the prior art, when the LED is used as a backlight source, it is driven by the output current of the constant current source to emit light. Therefore, the LED luminous intensity is basically constant, and the LED luminous intensity cannot be changed in a timely and spontaneous manner according to changes in the surrounding visual conditions. inconvenient to use

Method used

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  • Light-emitting device and method for adjusting light intensity of light-emitting device
  • Light-emitting device and method for adjusting light intensity of light-emitting device
  • Light-emitting device and method for adjusting light intensity of light-emitting device

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Embodiment Construction

[0035] see figure 1 , which is a functional block diagram of the light emitting device 100 in a preferred embodiment. The light emitting device 100 includes a power supply unit 10 , a constant current unit 20 , a sensing unit 30 , a pulse width modulation unit 40 and a light emitting unit 50 . The light-emitting device 100 can be used as a backlight module in electronic equipment such as televisions, mobile phones, and e-books, so that it can change the luminous intensity according to the intensity of the external light source.

[0036] The power supply unit 10 is used for providing working voltage to the constant current unit 20 , the sensing unit 30 and the pulse width modulation unit 40 .

[0037] The constant current unit 20 is used for receiving the voltage of the power supply unit 10 and generating a constant current.

[0038] The sensing unit 30 is used for sensing the surrounding environment to detect the light intensity of the external environment and thereby genera...

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Abstract

The invention discloses a light-emitting device, which comprises a power unit, a constant current unit for providing constant current, and a light-emitting unit. The light-emitting device also comprises a sensing unit and a pulse width modulation unit. The sensing unit is connected with the power unit, is used or sensing the light intensity of the external environment, and generates the corresponding sensing signal. The pulse width modulation unit is connected with the sensing unit, and is used for outputting the pulse voltage with different duty ratio according to the difference of the sensing signals. The light-emitting unit is connected with the power unit through the constant current unit, and is used for emitting the light with different intensities according to the pulse voltage with different duty ratio and the current of the constant current unit. The invention also provides a method for adjusting the light intensity of the light-emitting device.

Description

technical field [0001] The invention relates to a light emitting device and a method for adjusting light intensity thereof. Background technique [0002] At present, high-power light-emitting diodes (LEDs) have been applied to more and more fields, such as general lighting and backlight sources, due to their energy-saving, environmental protection, and high-efficiency characteristics. [0003] In the prior art, when the LED is used as a backlight source, it is driven by the output current of the constant current source to emit light. Therefore, the LED luminous intensity is basically constant, and the LED luminous intensity cannot be changed in a timely and spontaneous manner according to changes in the surrounding visual conditions. It is inconvenient to use. Contents of the invention [0004] In view of this, it is necessary to provide a lighting device that can automatically adjust the lighting intensity. [0005] In addition, it is also necessary to provide a method ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F21S8/00F21V23/00G09G3/34
CPCG09G3/3406G09G2320/064G09G2310/0237G09G2360/144
Inventor 戴龙张绍林
Owner HONG FU JIN PRECISION IND (SHENZHEN) CO LTD
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