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Backlight device

A technology of backlight device and light emitting device, which is applied in lighting devices, fixed lighting devices, optics, etc. It can solve the problems of overheating of liquid crystal panels, shortening of LED life, color mixing, etc., and achieve the effect of increasing brightness and good heat dissipation effect

Active Publication Date: 2012-04-04
BOE TECH GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result, the total power consumption of the entire LED backlight device increases sharply, resulting in an increase in the operating temperature inside the backlight device.
When the temperature of the LED chip exceeds a certain critical temperature, its luminous efficiency will be greatly reduced, which will lead to a vicious circle and will inevitably shorten the life of the LED; Thermal stress deformation or yellowing of the board, color mixing; too high internal temperature of the backlight device will also cause the LCD panel to overheat and shorten the display life of the LCD panel

Method used

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Embodiment Construction

[0026] Such as figure 2 As shown, it is a structural schematic diagram of Embodiment 1 of the present invention. The backlight device of this embodiment includes a plurality of light emitting devices, that is, light-emitting diodes 41, a reflector 42, and an optical module 43; the reflector 42 is used to reflect light, and the bottom reflector 421 and side reflectors 422. The side reflectors 422 are respectively located around the bottom reflector 421 and extend vertically from the bottom reflector 421 to form a box-shaped opening on one side. The side reflectors 422 are respectively provided with at least one cooling hole. 4221, the opened heat dissipation holes 4221 can be rectangular, circular or elliptical; the bottom reflector 421 is provided with a number of openings 4211, and the openings 4211 are set as round holes or square holes according to the different arrangements of the light emitting diodes 41, and the light emitting diodes 41 is set at the opening 4211; the o...

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Abstract

The invention discloses a backlight device which comprises a bottom reflecting plate, a light-emitting device, side reflecting plates and an optical module, wherein the bottom reflecting plate is used for reflecting light; the side reflecting plates are positioned on the circumference of the bottom reflecting plate, and is used for reflecting light; the optical module is positioned on one side ofthe side reflecting plate; the side reflecting plate is provided with radiating holes used for radiating; and the radiating hole is provided with a hem, and light shined to the radiating hole is reflected to the inner part of the backlight device by the hem. The invention increases the brightness of the backlight device, achieves good radiation and can effectively avoid light leakage through the arrangement of the radiating holes in the backlight device.

Description

[0001] This application is a divisional application of the invention application with the application number 200710175488.1 submitted on September 29, 2007. technical field [0002] The invention relates to a backlight device, in particular to a direct-down backlight device with a heat dissipation device in a liquid crystal display. Background technique [0003] The liquid crystal panel in the liquid crystal display does not emit light, but relies on the backlight device behind the liquid crystal panel to emit light as a light source, thereby completing the display function. Currently, the most widely used backlight source is mainly a light emitting diode (Light Emitting Diode, LED for short). LEDs have good color reproduction, good brightness uniformity, long service life and good shock resistance, and have been widely used in backlight devices of liquid crystal panels. [0004] Such as figure 1 As shown, it is a schematic structural view of a direct-lit LED backlight dev...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02F1/13357F21S8/00F21V29/00F21Y101/02F21V29/83F21Y115/10
Inventor 王庆江万丽芳张丽蕾刘敬伟
Owner BOE TECH GRP CO LTD