CN201166314Y - LCD backlight system using colour blending LED light source to combine with green LED light source - Google Patents

LCD backlight system using colour blending LED light source to combine with green LED light source Download PDF

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Publication number
CN201166314Y
CN201166314Y CNU2008200921868U CN200820092186U CN201166314Y CN 201166314 Y CN201166314 Y CN 201166314Y CN U2008200921868 U CNU2008200921868 U CN U2008200921868U CN 200820092186 U CN200820092186 U CN 200820092186U CN 201166314 Y CN201166314 Y CN 201166314Y
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China
Prior art keywords
led light
light source
green
light
red
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Expired - Lifetime
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CNU2008200921868U
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Chinese (zh)
Inventor
李明远
陈盈君
肖俊
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CHANGZHI HI-TECH INDUSTRIAL INVESTMENT CO., LTD.
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SHENZHEN ZHONGDIAN MIAOHAO SOLID LIGHT SOURCE CO Ltd
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Abstract

The utility model provides an LCD backlight system which uses a mixed color LED light source to combine with a green LED light source. The backlight system uses two LED light sources of the mixed color LED light source and the green LED light source, wherein the mixed color LED light source is that a blue LED chip excites red fluorescent powder to send out red lights, and blue and red lights are mixed into mixed color lights, and the green LED light source is that a single green LED chip sends out green lights. Fluorescent powder used by a white LED light source comprises red fluorescent powder, therefore the components of an emission spectrum comprise blue and red peak values, and a red emission spectrum component is increased than a white LED light source which is formed by common mixed color. The scheme of the utility model makes up and improves the emission spectrum components of the LED light source of the backlight system, increases the components of red and green lights, and can increase the color gamut range of display devices.

Description

Use the LCD back light system of mixed color LED light source combining with green LED light source
Technical field
The utility model relates to a kind of back light system that uses semiconductor light sources, is specifically related to use LCD (Liquid Crystal Display, the liquid crystal display) back light of LED (Light-Emitting Diode, light emitting diode) light source.
Background technology
Along with the technology of ultra-bright LED is ripe gradually, price constantly descends, because of its have life-span length, vibration resistance, luminous efficiency height, noiseless, be not afraid of advantages such as low temperature, no mercury pollution problem and cost performance height, LED has obtained very big expansion in various signals demonstrations and lighting source Application for Field, especially in the application facet of backlight of LCD, it replaces CCFL (Cold-CathodeFlorescent Lamps gradually, cold cathode fluorescent tube) backlight has demonstrated great potential in field of liquid crystal display.
Because brightness is low, LED in the past can only be limited on the miniscope as the use of backlight.Along with the fast development of semiconductor technology, add the new ideas of package design, brightness and the efficient of LED are significantly improved, and the range of application in LED-backlit source is more extensive.
As backlight, LED can roughly be divided three classes: white, monochrome and polychrome.When using White LED backlight, circuit is simple relatively, and its principle of sending white light is: the blue light part that chip sends changes gold-tinted into by media; Blue light and gold-tinted are mixed just to have produced white light, and chromaticity coordinates (white point) depends on the ratio of blue light and gold-tinted, and white colour temperature is fixed, and colour gamut is less.When constituting white with red, green, blue LED, can improve LCD display preceding color and brightness characteristics, when enlarging colour gamut, can also realize high brightness, thereby more superior than CCFL in this respect.Use the RGB of monochromatic LED backlight, because each color is arranged alternately, just need the required space of additive color mixing, produce uniformly mixed light, the size in this colour mixture district depends on two distances between the homochromy LED and their angle of departure.By contrast, multi-colored led and colour mixture White LED is to occur in its encapsulating structure, and therefore, it is just much smaller that the emission characteristics of light is compensated required space, but the back light system of this scheme drives and the control circuit more complicated.
In order further to enlarge color expression range, be not limited to R (red) in the past, green (G), B (indigo plant) three primary colors, can realize multicolor by appending new color, make lcd screen have broader colour gamut.
Because LED is a spot light, radiation pattern is conical, so the key of LED-backlit is to obtain a surface of evenly illuminating.LGP is the effective ways that improve color homogeneity.In order to obtain high brightness, be better than using the scheme in sidelight source with LED scheme of direct illumination after lcd screen.
Chinese patent 200410048713.3 provides a kind of backlight combination and has the LCD of this backlight assembly, is side-light type back light, and does not specify employed light source; Patent 03106671.2 described backlight is arranged on the rear side of irradiated body, and its light source is made of the light emitting diode of any color in green, blue-green, blueness, orange, red, the yellow green, and its liquid crystal indicator is the white and black displays type; Chinese patent 02152111.5 described backlight is to use the side-light type back light of a plurality of light emitting diodes.
In the back light system of existing patent, all do not mention light source mixing monochromatic LED light source that blue led adds red fluorescence powder as backlight, to improve the color representation power and the gamut range of display device.
Summary of the invention
The purpose of this utility model is to provide a kind of LCD back light system that uses mixed color LED light source combining with green LED light source.Back light system of the present utility model uses two kinds of led light sources: mixed color LED light source and green LED light source.
Described mixed color LED light source is to send ruddiness by the blue-light LED chip excitated red fluorescent powder, indigo plant, ruddiness is mixed form mixed light.
Described green LED light source is that monochromatic green light LED chip sends green glow.
The above-mentioned employed fluorescent material of mixed color LED light source comprises red fluorescence powder, thus in the composition of its emission spectrum indigo plant is arranged, the peak value of red two colors, the White LED light source that forms than common colour mixture has increased the red spectrum composition.About the proportioning of finished product, manufacturing and the fluorescent material of the fluorescent material of redness, to mix be prior art and technology, and Related product can be bought or customize.
The chromaticity coordinates of lcd screen (white point) depends on the ratio of several color of light, needs according to display screen, the optional scope of the colour temperature of mixed color LED light source generally is: 3500K~12000K, wherein the optional scope of the dominant wavelength of blue-light LED chip generally is: 380nm~480nm, and the optional scope of the peak wavelength of the red light that excites generally is: 580nm~645nm; The optional scope of the dominant wavelength of green LED light source generally is: 490nm~540nm.
In the light component of backlight, the shared ratio of versicolor light is decided according to the demonstration needs of screen color.In two kinds of led light sources, green glow generally occupies greater than one of percentage ratio in total light intensity or total light flux, specifically according to using needs to decide, accounts for 5%~20% as green glow, or 30%~40%, or other arbitrary proportions.
As shown in Figure 1 and Figure 2, in described back light system, a plurality of mixed color LED light sources (11) and a plurality of green LED light source (12) are installed simultaneously on printed substrate (PCB) (2), two kinds of led light sources are intermeshing evenly distributed.The light direction of all led light sources is in the face of LGP, according to certain rules, a determining deviation arranges, and forms a luminous dot matrix that optical axis direction is parallel to each other.
At the light direction of led light source, be arranged in order LGP (3) and a series of blooming (4).
During work, the light that mixed color LED light source and green LED light source are sent all enters LGP (3), through fully reflection mixing, again by blooming devices such as (4), shines the rear surface of liquid crystal panel, forms back lighting.
In said structure, certain rule that described led light source is arranged and spacing do not have strict restriction, are evenly to be distributed as final goal with the brightness on the LCD screen, color.
Can regulate the brightness of two kinds of led light sources in the described back light system respectively,, obtain suitable screen color to change the spectral component of whole light source.
The selection of led light source is according to using needs to decide in the back light system, and the encapsulating structure of led light source (comprising electrical structure, optical texture, frame for movement) is also determined according to different designs and use needs.
The beneficial effects of the utility model are: ordinary white led light source spectral component only concentrates on indigo plant, yellow dichromatism, scheme of the present utility model remedies the spectral component of the led light source of back light system and improves, increase composition red, green glow, can improve the gamut range of display device; And the back light system drive circuit complexity of RGB three primary colors LED light source, the shortcoming that cost is high have been avoided using.
Be described in further detail the utility model with reference to the accompanying drawings in conjunction with the embodiments.
Description of drawings
Fig. 1 is the generalized section of the utility model LCD back light system;
Fig. 2 is the vertical view that the PCB of two cover light sources has been installed in the utility model LCD back light system.
The specific embodiment
Embodiment one
See also Fig. 1 and Fig. 2, a plurality of mixed color LED light sources (11) and a plurality of green LED light source (12) are installed on the PCB (2) simultaneously, and two kinds of led light sources are intermeshing evenly distributed respectively.The proportioning required according to the light component of backlight determined the quantity of mixed color LED light source (11) and green LED light source (12).
Wherein the colour temperature of mixed color LED light source is selected 6500K~7500K, and the dominant wavelength of green LED light source is selected 525nm~535nm.
Led light source adopts paster that the form of (SMT) is installed, and the shooting angle of light (FWMH) is 120 °.The equal selection work electric current of used mixed color LED light source and green LED light source is 150mA, the high-power and high-luminance LED of power 0.5W.
PCB has made corresponding circuit on (2), and two kinds of led light sources can operate as normal also be controlled respectively.
As shown in Figure 1, at the light direction of led light source, be arranged in order LGP (3) and a series of blooming (4).
During work, the light that mixed color LED light source and green LED light source are sent all enters LGP (3), and through fully reflection mixing, by blooming (4), its effect is that the direction of light is put in order again.Last light shines the rear surface of liquid crystal panel, forms back lighting.
Embodiment two
Basic identical with embodiment one, different is that wherein mixed color LED light source (11) selection work electric current is 150mA, the high-power and high-luminance LED of power 0.5W, and green LED light source (12) selection work electric current is the low-power LED of 20mA, compares intensive arrangement.
Embodiment three
Basic identical with embodiment one, different is wherein mixed color LED light source (11) and the equal selection work electric current of green LED light source (12) be the low-power LED of 20mA, compare intensive arrangement.
More than be that preferred implementation of the present utility model is described, those skilled in the art is in the scheme scope of the utility model technology, and common variation and the replacement carried out all should be included in the protection domain of the present utility model.

Claims (8)

1. a LCD back light system that uses mixed color LED light source combining with green LED light source is characterized in that described mixed color LED light source is to send ruddiness by the blue-light LED chip excitated red fluorescent powder, and blue, ruddiness mixes the formation mixed light; Described green LED light source is that monochromatic green light LED chip sends green glow.
2. according to the back light system of claim 1, it is characterized in that the employed fluorescent material of described mixed color LED light source comprises red fluorescence powder, has the peak value of indigo plant, red two colors in the composition of its emission spectrum.
3. according to the back light system of claim 1, the optional scope of colour temperature that it is characterized in that described mixed color LED light source is: 3500K~12000K, wherein the optional scope of the dominant wavelength of blue-light LED chip is: 380nm~480nm, the optional scope of the peak wavelength of the red light that excites is: 580nm~645nm.
4. according to the back light system of claim 1, it is characterized in that the optional scope of dominant wavelength of described green LED light source is: 490nm~540nm.
5. according to the back light system of claim 1, in described two kinds of led light sources, green glow occupies greater than centesimal ratio in total light intensity or total light flux.
6. according to the back light system of claim 1, it is characterized in that installing simultaneously a plurality of mixed color LED light sources and a plurality of green LED light source on printed substrate, two kinds of led light sources are intermeshing evenly distributed.
7. according to the back light system of claim 6, the light direction that it is characterized in that described all led light sources is arranged and is formed the luminous dot matrix that optical axis direction is parallel to each other in the face of LGP.
8. according to the back light system of claim 1, it is characterized in that light direction, be arranged in order LGP and a series of blooming at led light source.
CNU2008200921868U 2008-02-18 2008-02-18 LCD backlight system using colour blending LED light source to combine with green LED light source Expired - Lifetime CN201166314Y (en)

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CNU2008200921868U CN201166314Y (en) 2008-02-18 2008-02-18 LCD backlight system using colour blending LED light source to combine with green LED light source

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102913815A (en) * 2012-09-26 2013-02-06 苏州佳世达电通有限公司 Light source module and related backlight system thereof
WO2015192413A1 (en) * 2014-06-19 2015-12-23 深圳市华星光电技术有限公司 Led packaging structure and liquid crystal display device
CN107615143A (en) * 2015-06-08 2018-01-19 夏普株式会社 Backlight arrangement and the liquid crystal display device for possessing the backlight arrangement
CN107816665A (en) * 2017-11-02 2018-03-20 安徽唯诗杨信息科技有限公司 A kind of bluish-green LED backlight module of high colour gamut and preparation method thereof
CN109360884A (en) * 2018-11-05 2019-02-19 苏州晶世达光电科技有限公司 A kind of preparation method of LED display module

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102913815A (en) * 2012-09-26 2013-02-06 苏州佳世达电通有限公司 Light source module and related backlight system thereof
WO2015192413A1 (en) * 2014-06-19 2015-12-23 深圳市华星光电技术有限公司 Led packaging structure and liquid crystal display device
CN107615143A (en) * 2015-06-08 2018-01-19 夏普株式会社 Backlight arrangement and the liquid crystal display device for possessing the backlight arrangement
CN107816665A (en) * 2017-11-02 2018-03-20 安徽唯诗杨信息科技有限公司 A kind of bluish-green LED backlight module of high colour gamut and preparation method thereof
CN107816665B (en) * 2017-11-02 2020-01-07 深圳市众铭安科技有限公司 High-color-gamut blue-green LED backlight module and manufacturing method thereof
CN109360884A (en) * 2018-11-05 2019-02-19 苏州晶世达光电科技有限公司 A kind of preparation method of LED display module

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ASS Succession or assignment of patent right

Owner name: CHANGZHI HI-TECH. INDUSTRY INVESTMENT CO., LTD.

Free format text: FORMER OWNER: SHENZHEN ZHONGDIAN MIAOHAO SOLID LIGHT SOURCE CO., LTD.

Effective date: 20110909

C41 Transfer of patent application or patent right or utility model
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Free format text: CORRECT: ADDRESS; FROM: 518102 SHENZHEN, GUANGDONG PROVINCE TO: 046000 CHANGZHI, SHAANXI PROVINCE

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Effective date of registration: 20110909

Address after: 046000 No. 12 Jiefang West Road, Shanxi, Changzhi

Patentee after: CHANGZHI HI-TECH INDUSTRIAL INVESTMENT CO., LTD.

Address before: 518102 R & D center, 1, science and Technology Innovation Park, Baoan the Peach Garden, Shenzhen, Baoan District, Guangdong

Patentee before: Shenzhen Zhongdian Miaohao Solid Light Source Co., Ltd.

CX01 Expiry of patent term

Granted publication date: 20081217

CX01 Expiry of patent term