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LED backlight system of packing LED using three primary colors (RGB)

A technology of LED light source and backlight system, applied in the field of backlight system, can solve the problems of uniform white light, inability to obtain, not using light diffuser at the same time, etc.

Active Publication Date: 2007-05-16
CHANGZHI HONGYUAN PHOTOELECTRIC TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] RGB backlighting using single-color LEDs also presents a particular disadvantage: Since the colors are arranged alternately, additional space required for color mixing is required to produce a uniformly mixed light
The disadvantage of this method is that a certain distance is required to mix the light, otherwise a more uniform white light cannot be obtained
That is to say, in the backlight system of the prior art, there is no device that uses three primary color LEDs in one unit; there is no homogenizer that uses light refraction and diffraction at the same time

Method used

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  • LED backlight system of packing LED using three primary colors (RGB)
  • LED backlight system of packing LED using three primary colors (RGB)
  • LED backlight system of packing LED using three primary colors (RGB)

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Please refer to FIG. 1 , the structure of the backlight system from bottom to top is: a light source module 1 , a reflection box 2 and a scattering layer 31 .

[0035] Please refer to Fig. 2 and Fig. 3, the LED light source 11 packaged in three primary color units, the red, green and blue three-color chips 111, 112 and 113 packaged in each LED, when the rated operating current is 20mA, the dominant wavelengths are respectively: 615~ 625nm, 520~535nm, 460~475nm, the light intensity is: 180~450mcd, 450~1120mcd, 71~180mcd respectively; the LED adopts the form of chip mounting (SMT), which is a package structure of 6 leads, and each 2 leads are independent control a chip. The outgoing angle (FWMH) of the light is 120°.

[0036] Please refer to Fig. 4, several LED light sources packaged with the above-mentioned three primary color units are soldered to an aluminum-based PCB 12 by SMT mounting process. The aluminum-based PCB has designed corresponding circuits according to t...

Embodiment 2

[0046] Please refer to FIG. 6 , the composition structure of the backlight system from bottom to top is: light source module 1 , reflection box 2 and refraction-diffraction mixing light guide plate 32 .

[0047] The light source module of the LCD backlight system is the same as the first embodiment.

[0048] On one side of the opening of the reflection box, a refraction-diffraction mixing light guide plate 32 is installed. The function of the light guide plate is to mix and diffuse the light irradiated on the incident surface 321 , so as to obtain relatively uniform light on the light emitting surface 322 .

[0049] The refraction-diffraction hybrid system is composed of a diffractive optical device and a traditional refractive optical device, that is, the surface of the substrate is made into a diffractive optical device 32a, and the substrate itself is made into a refractive optical element 32b. Specifically, the light guide plate itself is a refractive element, and some mi...

Embodiment 3

[0053] It basically follows the same structure as the second embodiment, except that there are several grooves 3211 on the incident surface 321 of the refraction-diffraction mixing light guide plate 32 , as shown in FIG. 8 . The position and shape of the groove correspond to the position and shape of the LED light source on the aluminum-based PCB in the light source module, and the function is to collect the light emitted by the LED.

[0054] After installation, the LED light source on the light source module is directly embedded in the groove 3211 on the incident surface 321 of the refraction-diffraction mixing light guide plate, the light emitted by the LED directly enters the light guide plate through the groove, is mixed and diffused in the light guide plate, and then flows out The emitting surface 322 can obtain uniform light with a suitable color temperature.

[0055] Since the LED light source is directly embedded in the groove on the incident surface of the light guide...

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Abstract

The invention discloses a LCD weakening light system of three basic colors(RGB) unit sealed LED and includes a light source module, a reflecting box and a light blender. The light source module contains several light source parts composed of RGB LED chips. One LED chip is sealed in one unit parts and then the part is arranged to form a light source. Moreover, The RGB chip of every LED light source can be driven independently to guarantee that the three color lights have the temperature and brightness required when it arrives at the weakening light system. The lights can be mixed in a unit sealed. The light blender is a light transmission plank of refraction and diffraction admixture. The plank is a light refraction component and its surface has tiny stair array structure. To gain more uniform light, use different dispersion layers or brightness increasing films.

Description

technical field [0001] The invention relates to a backlight system of a semiconductor light source, in particular to an LCD backlight light source using an LED light source packaged with three primary color units and a homogenizer, its preparation method and application. technical background [0002] With the gradual maturity of ultra-bright LED technology, the price continues to drop. Because of its use of three primary colors, good color reproduction, low power consumption, and long life, short and thin, and environmental protection, it has gradually replaced CCFL. Backlight has shown great potential in the field of liquid crystal display. [0003] Due to the low brightness, the use of LEDs as backlight sources in the past can only be limited to small displays. With the rapid development of semiconductor technology and the new concept of packaging design, the brightness and efficiency of LEDs have been significantly improved, and the application range of LED backlights ha...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02F1/13357F21Y101/02G02B5/18G02F1/1335F21Y115/10
Inventor 李明远陈迎春肖俊陈皓明
Owner CHANGZHI HONGYUAN PHOTOELECTRIC TECH
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