CN1693962A - LED backlight system of packing LED using three primary colors (RGB) - Google Patents
LED backlight system of packing LED using three primary colors (RGB) Download PDFInfo
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- CN1693962A CN1693962A CNA2005100346299A CN200510034629A CN1693962A CN 1693962 A CN1693962 A CN 1693962A CN A2005100346299 A CNA2005100346299 A CN A2005100346299A CN 200510034629 A CN200510034629 A CN 200510034629A CN 1693962 A CN1693962 A CN 1693962A
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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
The present invention relates to a kind of back light system of semiconductor light sources, be specifically related to the LCD back light that uses three primary colours unit package LED and use light uniforming device, Preparation Method And The Use.
Technical background
Along with the technology of ultra-bright LED is ripe gradually, price constantly descends, and because of it adopts three-color light-emitting, color reductibility is good, power consumption is low, adds advantages such as long and short little frivolous, environmental protection of life-span, it replaces the CCFL backlight gradually, 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.
LED is that a kind of noticeable LCD backlight is selected, and especially when constituting white with red, green, blue LED, can improve display screen preceding color and brightness characteristics.If as the LCD backlight, can obtain three spectrum compositions around its predominant wavelength by design with primitive colours LED; And can shield inferior pixel by LCD and eliminate its all spectrum outside peak value spectrum, thereby when enlarging the color reproduction rate, can also realize high brightness, thus more superior than CCFL in this respect.
Because it is different that the colour temperature that dialogue fields such as multimedia, TV and graphical arts show requires, this just need regulate white colour temperature according to circumstances; But the LCD that with CCFL is backlight is difficult to control the spectral distribution of its backlight, and in order to obtain the good control to white colour temperature, must sacrifice the color reproduction gray scale dynamic range of LCD.But LED can control white colour temperature by the brightness of every kind of color LED of darkening respectively, thereby will win CCFL one undoubtedly in this respect and raise.
Be generally the serviceable life of large-scale LCD screen 5～60,000 hours, and the life-span of CCFL backlight generally has only 20,000 hours at present.The theoretical life-span of LED product is 100,000 hours, considers other factors, and be 5～60,000 hours actual life, and this just is complementary with the requirement of LCD display.
Up to the present, it is very few to do the enterprise that large scale liquid crystal shows with the LED-backlit source in the world.And the large scale liquid crystal demonstration aspect, LED-backlit source or the blank out of China.
As backlight, LED can roughly be divided three classes: white, monochrome and polychrome.
When using White LED backlight, circuit is simple relatively.But because 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.The color range of display screen is restricted, and white colour temperature fixes, and is identical with CCFL.
Use that the RGB of monochromatic LED is backlight also to have shown special shortcoming: 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 emission angle.For the module that has light guide plate, the surface of light guide plate must increase; And for the reflective box structure, then thickness must increase.
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.
On the whole, among the three class LED, multi-colored led is the optimal selection of colored display backlight.
Because LED is a pointolite, radiation pattern is conical, so the key of LED-backlit is to obtain a surface of evenly illuminating.The main flow of LED-backlit system is the side light type LED back light source of adopting monochromatic LED light source+light guide plate at present.
Light guide plate is to improve the effective ways of color homogeneity, but owing in the process that light is propagated loss is arranged in plate, it is lower to the utilization factor of light.If target is a televisor, its brightness should reach 400～500cd/m at least
2Thereby, be better than using the scheme of light guide plate with LED scheme of direct illumination after lcd screen in order to obtain high brightness.
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, and does not propose to use multi-colored led as light source.Also have CN1558284, CN1383501 and JP8-211361, the LED that these backlight assemblies or system use arranges monochromatic chip according to certain rule, carry out mixed light then and obtain white light.The shortcoming of this method is to need the distance of certain size to come mixed light, otherwise can not obtain the comparison uniform white light.In other words, in the back light system of prior art, neither one uses the device of three-primary color LED in a unit; Do not make the refraction of using up and the light uniforming device of diffraction simultaneously yet.
Summary of the invention
The object of the present invention is to provide the LCD back light system of a kind of use three primary colours (RGB) packaged LED.Back light system of the present invention comprises, comprise light source module, reflective box and light uniforming device, wherein said light source module comprises a plurality of light source devices, each light source device is made of the led chip of three primary colours, the led chip of three primary colours is encapsulated in the unit component, this unit component is arranged formed light source then.
Another object of the present invention provides the back light system of a kind of three primary colours unit package LED, wherein RGB three color chips of each led light source can drive be controlled, so that three coloured light lines meet the requirements of colour temperature behind the preliminary mixed light in the structure of unit package and brightness is transmitted into back light system again, thereby realize the demonstration colour gamut on a large scale and the high brightness of LCD back light system.And red, green, blue three color chips that encapsulate in each led light source are when rated operational current, and the scope that predominant wavelength can be selected is respectively: 580～630nm, 500～540nm, 450～485nm.Also can and use needs to determine coupling between the optics/electrical specification (as predominant wavelength, luminous flux, light intensity and drive current, voltage etc.) of RGB three color chips according to different design proposals; The encapsulating structure of led light source (comprising electrical structure, optical texture, physical construction) is also determined according to different design proposals and use needs.
Further object of the present invention provides a kind of back light system, wherein uses light uniforming device, comprises rolling over the mixed light guide plate of spreading out, and is placed in the one side of reflective box opening, thereby obtains uniform light on the ejaculation surface of light.Described folding spreads out, and to pull matrix itself be photorefractive element to mixed leaded light, and there is small ladder array structure on its surface, thereby constitutes the micro optical array that obtains optical diffraction.
Present carry out the back light source system of mixed light, need the strict coupling of performances such as luminous flux of each LED, and mixed light, light-conducting system are required high, be easy to occur defectives such as mixed light is inhomogeneous, colour temperature deviation by a plurality of RGB monochromatic LEDs.
Using the LCD back light system of three primary colours unit package led light source is the direct backlight structure, after promptly the led light source of three primary colours unit package is arranged, makes the rear surface of light direct irradiation liquid crystal panel.The structure of back light system comprises light source module 1, reflective box 2 and light uniforming device 3.Light source module by several above-mentioned three primary colours unit package led light sources 11 according to certain rules, certain spacing arrangement on same plane, these led light sources form the luminous dot matrix that optical axis direction is parallel to each other.Described certain rule and spacing be meant according to customer requirements and select, and being actually does not have strict restriction.In a preferred embodiment, place light source module and make luminous dot matrix be positioned at reflective box 2, the light that dot matrix sends is mixed in the reflective box internal reflection.LED dot matrix by the spacing rule is arranged and reflective box with respective depth realizes even illumination on the display surface.The degree of depth of reflective box depends primarily on spacing and the emission angle of LED.Obtain further homogenising light, available different scattering layer or special brightness enhancement film (BEF), these all are market products on sale, also are well-known to those skilled in the art.If to the suitable in addition combination of different films, can reduce the degree of depth of reflective box.Direct backlight needing to be mainly used in high brightness (＞500cd/m
2), in the system in medium size and limited space.
Adopt direct LED-backlit scheme, the homogeneity of color remains key issue.Usually, LED arranges and closely is beneficial to colour mixture, and that still arranges is tight more, and thermal source is just concentrated more, needs complicated radiator structure.If the LED spacing is big, just favourable many to heat radiation, but the even problem that becomes again of irregular colour.Between color and heat, reach a balance by suitable design.The present invention adopts the three-primary color LED unit package and adopts light uniforming device just to solve this problem well.Unit package makes and significantly reduces light mixing distance by mixed light as early as possible.Prior art only is that monochromatic LED is arranged according to rule, is a kind of whole mixed light, and then light mixing distance is very big.With regard to light mixing distance, compare with prior art, under the identical situation of light-mixing structure, the present invention can shorten 3.5 times; If the prior art mixed light needs 28mm, the present invention only needs 8mm.This is significant to the thickness that reduces the finished product instrument.In addition, owing to used light uniforming device, not only obtain light more uniformly, and guaranteed colour temperature.Moreover the led chip of each color can be controlled separately, makes color undistorted.
Light uniforming device of the present invention is a kind of binary optical elements (Binary Optical Elements writes a Chinese character in simplified form BOE), and it is a kind of diffraction optical element of phase-type; With the diffraction of light effect is basic functional principle, adopts the element that the analysis of optical wave-front is designed diffraction position phase profile.The ultimate principle of binary optical, from the viewpoint of wave optics, require to be designed to a micro-embossment structure of binary with computing machine according to optical wave-front exactly, its dimension of picture is less than light wavelength, and then utilize microfabrication branch art, on medium or metallic substrates, be etched into device.The method of making binary optical elements mainly contains etching method, the coating method in the microelectronic technique, high precision diamond lathe programmed control cutting method etc. at present.Wherein the etching method in the microelectronic process engineering is the main means that adopt at present.Because the position phase profile that goes out of actual fabrication is serve as to quantize multiple with 2, with desirable continuous mutually the step shape of profile be similar to, so be called as " binary optical elements ".About the principle of light uniforming device and another patented claim of the visible inventor of structure, on May 20th, 1 submitted to, and title is " a kind of led light source that uses light uniforming device ", and its content this paper is in conjunction with quoting.
Description of drawings
Fig. 1 is the structural representation of an embodiment of LCD back light system of the present invention.
Fig. 2 is the structural representation of the led light source of three primary colours unit package of the present invention.
Fig. 3 is the plan view from above of the led light source of three primary colours unit package of the present invention.
Fig. 4 is the synoptic diagram of the light source module of LCD back light system.
Fig. 5 is the synoptic diagram of the reflective box of LCD back light system.
Fig. 6 is the structural representation of another embodiment of LCD back light system of the present invention.
Fig. 7 is the principle schematic of rolling over the mixed light guide plate of spreading out in the LCD back light system of the present invention.
Fig. 8 is the spread out synoptic diagram of mixed light guide plate of the folding that has some grooves.
Fig. 9,10, the 11st, LCD back light system of the present invention is the structural representation of several embodiment in addition.
Embodiment
Be described in further detail the present invention with reference to the accompanying drawings in conjunction with the embodiments.
Embodiment one
See also Fig. 1, back light system composition structure from top to bottom is: light source module 1, reflective box 2 and scattering layer 31.
See also Fig. 2 and Fig. 3, the led light source 11 of three primary colours unit package, red, green, blue three color chips 111,112 and 113 that encapsulate in each LED are when rated operational current 20mA, predominant wavelength is respectively: 615～625nm, 520～535nm, 460～475nm, light intensity is respectively: 180～450mcd, 450～1120mcd, 71～180mcd; LED adopts paster that the form of (SMT) is installed, and is the encapsulating structure of 6 lead-in wires, chip of the independent control of per 2 lead-in wires.The shooting angle of light (FWMH) is 120 °.
See also Fig. 4, the LED of the three primary colours unit package that several are above-mentioned is welded on the aluminum base PCB 12 with the paster mounting process, this aluminum base PCB has been got well corresponding circuit according to the arrangement design of LED, and the output of the input of responsible led light source driving power and feedback signal (temperature, color etc.).Select for use aluminum base PCB to be because its heat conductivity is better than general PCB, help the heat radiation of LED more.Size and optics needs according to lcd screen are set suitable arrangement mode and the spacing of LED.To consider that simultaneously the balance color needs uniformly and the needs of heat radiation.
For example, lcd screen for 15 inches, screen diagonal length is 381mm, aspect ratio is 3: 4, its height, wide 229mm and the 306mm of being respectively set LED and are arranged in parallel, and row, column is 10mm at interval, luminous lattice dimensions is 230mm * 310mm, and led light source quantity is 24 * 32=768; For 17 inches lcd screen, screen diagonal length is 443mm, and aspect ratio is 3: 4, its height, wide 271mm and the 338mm of being respectively set LED and are arranged in parallel, and row, column is 10mm at interval, luminous lattice dimensions is 270mm * 340mm, and led light source quantity is 28 * 35=980;
In this example, LED is arranged in parallel on aluminum base PCB, and row, column is spaced apart 10mm.In order to strengthen heat radiation, the aluminum base PCB back side can connect heating radiator.
More than finished the light source module 1 of LCD back light system.
In the one side of reflective box opening, a scattering layer 31 is installed.The effect of this scattering layer is that the light that will shine on the incidence surface 311 spreads, thereby obtains light comparatively uniformly on the ejaculation surface 312 of light.
When above-described back light system is worked, the led array of three primary colours unit package need provide suitable current by driving circuit by showing in the light source module, the mixed light that sends enters reflective box, in reflective box, reflect and further mixed, shine then on the incidence surface of scattering layer, through diffusion, obtain the suitable light of uniform colour temperature from outgoing plane, thereby provide desirable back lighting to lcd screen.
In the above-mentioned back light system, because that light source uses is the LED of three primary colours unit package, colour mixture is to occur in its encapsulating structure, mixed through the reflection of reflective box again, through the scattering layer diffusion, can satisfy LCD needs backlight after the emission characteristics of light compensated, and no longer need to utilize light guide plate to carry out mixed light, reduced light loss, and the structure of LCD back light system is greatly simplified, cost reduces greatly.
Obtain further homogenising light, available different scattering layer or special brightness enhancement film (BEF).If to the suitable in addition combination of different films, can reduce the degree of depth of reflective box.To in following embodiment, illustrate.
Embodiment two
See also Fig. 6, back light system composition structure from top to bottom is: light source module 1, reflective box 2 and folding spread out and mix light guide plate 32.
The light source module of LCD back light system is identical with embodiment one.
In the one side of reflective box opening, a folding mixed light guide plate 32 of spreading out is installed.The effect of this light guide plate is to mix and spread shining light on the incidence surface 321, thereby obtains light comparatively uniformly on the ejaculation surface 322 of light.
The folding hybrid system of spreading out is to be combined by diffraction optical device and traditional diffractive optical devices, and promptly the sheet primary surface is made diffraction optical device 32a, and the basic body of sheet is made refraction optical element 32b.Specifically, light guide plate itself is a refracting element, in the more well-designed micro optical array structures of the light exit surface of light guide plate, as shown in Figure 7.The aperture, unit is of a size of micron dimension, thereby has had diffraction element on the light guide plate surface, utilizes the refraction and the opposite effect (Abbe number negative sense) of two kinds of optical effects of diffraction in chromatic dispersion, and color difference eliminating is widened colour gamut effectively, improves color reproduction.
Roll over the hybrid system of spreading out and utilized the refraction and diffraction two specific characters of light simultaneously; Have unique chromatic dispersion character, good thermal behavior and monochromatic aberration calibration capability; In optical design, increase the degree of freedom of design; Multi-functional integrated, reduce volume and reduce cost; The dispersion characteristics of diffraction optical lens uniqueness can be used for achromatism.
In the above-mentioned back light system, roll over the mixed light guide plate of spreading out, the mixed effect of light is strengthened, reduced the mixed required space of light, therefore can reduce the degree of depth of reflective box, thereby the thickness of LCD back light system is reduced owing to used.
Embodiment three
Substantially according to the structure identical, have some grooves 3211 on the incidence surface 321 of folding spreads out mixed light guide plate 32 that different is, as shown in Figure 8 with embodiment two.The position and the shape of the led light source in the position of groove and shape and the light source module on the aluminum base PCB are corresponding, and effect is to collect the light that LED sends.
After the installation, LED on the light source module directly embeds the groove of rolling on the mixed light guide plate incidence surface 321 that spreads out 3211, the light that LED sends enters light guide plate by groove, mixes in light guide plate and spreads, and the outgoing plane 322 from light guide plate obtains the suitable light of uniform colour temperature then.
Because LED directly embeds the groove on the incidence surface of light guide plate, the light that LED is sent all enters light guide plate, has avoided light loss to greatest extent.
The emission characteristics that this structure need not reserved above light source module light compensates required space, directly carries out mixed light by the folding mixed light guide plate of spreading out, and has further reduced the thickness of LCD back light system.
Embodiment four
Substantially according to the structure identical, also has the special brightness enhancement film of one deck (BEF) 33 on the outgoing plane 322 of folding spreads out mixed light guide plate 32 that different is, as shown in Figure 9 with embodiment two.This brightness enhancement film can increase irradiant brightness and improve its homogeneity, thereby makes the light that shines lcd screen desirable more.
Embodiment five
Substantially according to the structure identical, also has the special brightness enhancement film of one deck (BEF) 33 on the outgoing plane 312 of different is scattering layer 31, as shown in figure 10 with embodiment one.This brightness enhancement film can increase irradiant brightness and improve its homogeneity, thereby makes the light that shines lcd screen desirable more.
Embodiment six
Consult Figure 11, substantially according to the structure identical with embodiment one, the bottom of reflective box that different is is opening not, and light source module is positioned on the base plane of reflective box, the top of light source module adds a dividing plate 4 in addition, have some apertures on this dividing plate, corresponding with the position of led light source on the aluminum base PCB.The ganoid reflecting surface of dividing plate reduces the loss of light reflection.The advantage of this structure is to reduce the leakage of light.
Embodiment seven
Substantially according to the structure identical with embodiment one, all there are lens (light uniforming device) that utilize the binary optical system principle top of different the is led light source of each three primary colours unit package in the light source module, design the optical texture of these lens according to actual needs, can obtain specific more uniform radiation pattern, follow-up optical design is simplified greatly.
More than be described in detail light source of the present invention and backing structure, obviously, those skilled in the art can do many improvement and conversion and not deviate from spiritual scope of the present invention.For example, can be rectangle with alteration of form, circle, ellipse etc.
Claims (14)
1. a LCD back light system that uses three primary colours (RGB) packaged LED comprises light source module, reflective box and light uniforming device; It is characterized in that described reflective box is a square casing, the top opening of reflective box, the bottom has some apertures, and the position of led light source is corresponding in the described light source module, and the reflective box inwall is smooth reflecting surface; Described light source module comprises a plurality of light source devices, and each light source device is made of the led chip of three primary colours, and the LED of three primary colours is encapsulated in the unit component, this unit component is arranged formed light source then; Described light uniforming device comprises the folding mixed light guide plate of spreading out, and is placed in the one side of reflective box opening, and the folding of light uniforming device spreads out and has some grooves on the incidence surface of mixed light guide plate, and the position and the shape of the led light source on the position of groove and shape and the aluminum base PCB are corresponding.
2. according to the back light system of claim 1, it is characterized in that RGB three color chips of each led light source can drive be controlled, so that three coloured light lines meet the requirements of colour temperature behind the preliminary mixed light in the structure of unit package and brightness is transmitted into back light system again.
3. according to the back light system of claim 1, red, green, blue three color chips that it is characterized in that each light source device encapsulation are when rated operational current, and the scope that predominant wavelength can be selected is respectively: 580～630nm, 500～540nm and 450～485nm.
4. according to the back light system of claim 1, after arranging, the led light source that it is characterized in that three primary colours unit package in the described module makes the rear surface of light direct irradiation liquid crystal panel.
5. according to the back light system of claim 4, it is characterized in that arranging three primary colours unit package led light source in the described module, make these led light sources form the luminous dot matrix that optical axis direction is parallel to each other.
6. according to the back light system of claim 1, it is characterized in that placing described light source module and make luminous dot matrix be positioned at reflective box, the light that dot matrix sends is mixed in the reflective box internal reflection.
7. according to the back light system of claim 6, it is characterized in that the LED of three primary colours unit package is connected on the aluminum base PCB, have corresponding circuit on this aluminum base PCB.
8. according to the LCD back light system of claim 7, it is characterized in that the described PCB back side connects heating radiator.
9. according to the back light system of claim 1, the depth range that it is characterized in that described reflective box is 1.5～2 times of spacing between the described unit package led light source.
10. according to the back light system of claim 9, what it is characterized in that described reflective box opening has scattering layer or brightness enhancement film or scattering layer and a brightness enhancement film.
11. according to the back light system of claim 9, to pull matrix itself be photorefractive element to mixed leaded light to it is characterized in that spreading out described folding, there is small ladder array structure on its surface, thereby constitutes the micro optical array that obtains optical diffraction.
12., it is characterized in that the aperture, unit of described small ladder array structure is of a size of micron dimension according to the back light system of claim 11.
13. back light system according to claim 1, the folding that it is characterized in that light uniforming device spreads out and has some grooves on the incidence surface of mixed light guide plate, the position and the shape of the led light source on the position of groove and shape and the aluminum base PCB are corresponding, thereby the light that LED is sent directly enters light guide plate by groove, mix in light guide plate and spread, the outgoing plane from light guide plate obtains the suitable even light of colour temperature then.
14. back light system according to claim 1, the bottom that it is characterized in that reflective box is opening not, and light source module is positioned on the base plane of reflective box, and the top of light source module adds a dividing plate in addition, have some apertures on this dividing plate, corresponding with the position of led light source on the aluminum base PCB.
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| CNB2005100346299A CN1316303C (en) | 2005-05-20 | 2005-05-20 | LED backlight system of packing LED using three primary colors (RGB) |
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| CNB2005100346299A CN1316303C (en) | 2005-05-20 | 2005-05-20 | LED backlight system of packing LED using three primary colors (RGB) |
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Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100451769C (en) * | 2005-12-28 | 2009-01-14 | 光远科技股份有限公司 | High-homogenized ultra-thin LCD backlight device |
| CN100595480C (en) * | 2008-07-01 | 2010-03-24 | 钟英 | LED seamless illuminating device with no dark space |
| CN102182983A (en) * | 2010-12-10 | 2011-09-14 | 浙江大学 | Light source device and method for tuning light energy spectrum |
| CN101246668B (en) * | 2007-02-12 | 2011-11-30 | 奇晶光电股份有限公司 | Organic LED display and its brightening driving method |
| US8142043B2 (en) | 2008-10-24 | 2012-03-27 | Advanced Optoelectronic Technology, Inc. | Planar light source apparatus having reflective surfaces |
| WO2012129976A3 (en) * | 2011-04-01 | 2012-11-15 | 上海广茂达光艺科技股份有限公司 | Led projection lamp |
| TWI382134B (en) * | 2009-12-31 | 2013-01-11 | Univ Nat Formosa | Multi-color light emitting diodes array structure with uniformity color mixing |
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