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Low-power extremely-high-brightness LED (light emitting diode) backlight source used for liquid crystal projection display system

A technology of display system and liquid crystal projection, applied in the field of lighting light source and optics, can solve the problems of low power and brightness, complex configuration, high power, etc., and achieve the effects of improving uniformity, short design cycle and long life.

Inactive Publication Date: 2012-07-04
NO 55 INST CHINA ELECTRONIC SCI & TECHNOLOGYGROUP CO LTD
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  • Abstract
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  • Application Information

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Problems solved by technology

[0004] The present invention proposes a low-power, extremely high-brightness LED backlight source for liquid crystal projection display systems. Its purpose is to overcome the defects of complex configuration, high power, and high cost in the prior art, and to meet the requirements of projection display systems. It can replace the traditional high-brightness pixel tube, and has the characteristics of low power and high brightness

Method used

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  • Low-power extremely-high-brightness LED (light emitting diode) backlight source used for liquid crystal projection display system
  • Low-power extremely-high-brightness LED (light emitting diode) backlight source used for liquid crystal projection display system
  • Low-power extremely-high-brightness LED (light emitting diode) backlight source used for liquid crystal projection display system

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Embodiment Construction

[0025] control figure 2 , the light energy (shaded part) outside the range of spherical angle ±30° accounts for about 70% of the total luminous flux. It can be calculated by formula (1), in Φ In the case of constant luminous flux, if the LED light with approximate Lambertian distribution (equivalent to θ is 120°) is focused to within ±30° (equivalent to θ is 60°), the light intensity at the frontal angle of 0° I theoretically can be increased to 3.73 times the original brightness. Therefore, adding a reflective bowl can greatly increase the brightness of the backlight; or to achieve the same brightness of the backlight, the power can be reduced to less than 30% of the original;

[0026]

[0027] In formula (1), Φ is the luminous flux (unit Lm), and I is the light intensity at 0 degree angle (unit cd). θ is 2θ1 / 2 angle, which is commonly referred to as LED half-brightness angle.

[0028] control image 3 , Figure 4 , LED power (power = current × voltage) is not propo...

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Abstract

The invention provides a low-power extremely-high-brightness LED backlight source used for a liquid crystal projection display system. The low-power extremely-high-brightness LED backlight source comprises the following configuration methods: (1) a high-efficiency LED array and condensing-reflection bowl array arrangement manner is adopted; (b) the LED may be an LED light emitting unit consisting of one to three LEDs or LED chips with different colors of red, green and blue and at least having one green LED or LED chip; (c) a high-efficiency LED chip is adopted; (d) an aluminum-based, copper-based or thermally conductive ceramic substrate backlight circuit board is adopted; (e) the single LED chip has a rated power of 0.5 W or above, and the low-power operation manner can fully improve the LED luminous efficiency; and (f) an optical brightness enhancement membrane between a liquid crystal display screen and the LED light emitting unit is tightly attached to the liquid crystal display screen. The low-power extremely-high-brightness LED backlight source has the advantages of short design period, low manufacture cost of a key optical element (namely reflector), long service life, and high convenience in installation and maintenance, and can be used for manufacturing the backlight source of various kinds of liquid crystal projection heads-up display system.

Description

technical field [0001] The invention relates to a very high-brightness LED backlight light source for a liquid crystal projection display system. The invention belongs to the field of light source for illumination and optical technology. Background technique [0002] At present, traditional projection display systems use high-brightness pixel tubes as high-brightness display image sources. See figure 1 The high-brightness pixel tube is a cathode ray tube (CRT). Since color display systems such as CRT TVs and monitors have been replaced by flat-panel display systems such as liquid crystals and plasma displays, PDPs, CRT-related industries have gradually disappeared today. , so high-brightness pixel tubes will also be gradually replaced by extremely high-brightness liquid crystal display image sources; the projection display optical system will display the image source display screen through the projection system to enlarge the field of view, and reflect it to the observer's ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F21S8/00F21V19/00F21V7/22F21V29/00G03B21/14G02F1/13357F21Y101/02F21V29/507F21V29/508F21Y115/10
Inventor 吴金华张小芸陈建军洪乙又杨洪宝
Owner NO 55 INST CHINA ELECTRONIC SCI & TECHNOLOGYGROUP CO LTD
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