CN203707182U - Backlight module and light source thereof - Google Patents
Backlight module and light source thereof Download PDFInfo
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- CN203707182U CN203707182U CN201320539530.4U CN201320539530U CN203707182U CN 203707182 U CN203707182 U CN 203707182U CN 201320539530 U CN201320539530 U CN 201320539530U CN 203707182 U CN203707182 U CN 203707182U
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- light
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Abstract
The utility model provides a backlight module and a light source thereof. The light source and the backlight module are applied to a vehicle-mounted display device. The light source comprises an LED chip, and mixed phosphor which contains red phosphor and green phosphor and is located on a light-exiting surface of the LED chip. Because the red phosphor contains materials generating red light, and the green phosphor contains materials generating red light, the emergent light comprises red light and green light under the excitation of light generated by the LED chip. Therefore, the colors of a displayed image of the vehicle-mounted display device comprises more red and green light when the light source provided by the utility model serves as the light source of the backlight module in the vehicle-mounted display device, thereby enabling the red light of the displayed image to be redder, enabling the green light to be greener, enabling the color purity of the imaged displayed by the vehicle-mounted display device, and enabling the color gamut to be wider.
Description
Technical field
The utility model relates to flat panel display field, relates in particular a kind of backlight source module and light source thereof.
Background technology
Light-emitting diode (Light Emitting Diode, be called for short LED) be a kind of energy conversion device that converts electrical energy into luminous energy, there is the advantages such as operating voltage is low, power consumption is few, stable performance, life-span length, shock resistance, vibration resistance is strong, lightweight, volume is little, cost is low, luminescence response is fast.Therefore aspect the light source of display unit, be widely used, particularly developing rapidly of blue, purple and ultraviolet LED in recent years, makes LED replace incandescent lamp and fluorescent lamp becomes possibility at lighting field.
Blueness, purple and ultraviolet LED generally can not directly be applied in lighting field, and especially, in display device, its backlight must be white light.The generation of white light has two kinds of approach: first method is exactly that LED rubescent, green, blue three-color light is used in combination to generation white light; Second method is mixed to form white light with sending out other luminescent material of LED deexcitation monochromatic exactly, excites yellow fluorescent material with blue-ray LED, or forms white lights with purple or three kinds of fluorescent material of ultraviolet LED deexcitation red, green, blue.
From current development trend, at aspects such as feasibility, practicality and commercializations, second method is all far superior to first method.And at present in second method, adopt blue led to excite the technology of yellow fluorescent powder generation white light own through relatively ripe, but when blue led excites light source that yellow fluorescent powder produces white light as the light source of display device for mounting on vehicle, the colour gamut of the image that display device for mounting on vehicle demonstrates is narrower.
Utility model content
In view of this, the utility model provides a kind of backlight source module and light source thereof, while exciting to solve the LED of the coloured light that turns blue in prior art light source that yellow fluorescent powder produces white light as the light source of display device for mounting on vehicle, the narrower problem of colour gamut of the image that display device for mounting on vehicle demonstrates, the not high enough problem of colorimetric purity of the image also demonstrating.
For achieving the above object, the utility model provides following technical scheme:
A kind of light source, comprises red green fluorescence powder, light-emitting diode chip for backlight unit, and described light source applications is in display device for mounting on vehicle, and the red green fluorescence powder of described light source is positioned at described light-emitting diode chip for backlight unit exiting surface side;
Wherein, the mixed fluorescent powder that described red green fluorescence powder is red fluorescence powder and green emitting phosphor.
Preferably, described light-emitting diode chip for backlight unit is the light-emitting diode chip for backlight unit of transmitting blue light.
The utility model also provides a kind of backlight source module simultaneously, the backlight source module that described backlight source module is display device for mounting on vehicle, and described backlight source module comprises:
Light guide plate;
The light source that is positioned at described light guide plate outside, described light source is light source recited above.
Preferably, described light guide plate comprises exiting surface, the end face vertical with described exiting surface and the relative bottom surface with described exiting surface; Described light source is positioned at the end face outside of described light guide plate.
Preferably, also comprise the diffusion barrier that is positioned at described light guide plate exiting surface and the multilayer bright enhancement film that is positioned at described diffusion barrier surface.
Preferably, also comprise the reflector plate that is positioned at described bottom surface of light guide plate.
Known via above-mentioned technical scheme, the light source applications that the utility model provides is in display device for mounting on vehicle, and described light source comprises LED chip, is positioned at red fluorescence powder on described LED chip exiting surface and the mixed fluorescent powder of green emitting phosphor.Because described red fluorescence powder comprises the material that produces red light, and green emitting phosphor comprises the material that produces green light, thereby under the exciting of the light producing at LED chip, in the light of outgoing, comprise red light and green light, and then the light source providing at the utility model is during as light source in the backlight source module of display device for mounting on vehicle, display device for mounting on vehicle shows in the color of image, comprise red light and green light is more, thereby make to show that in image, redness is redder, green is greener, also make the colorimetric purity of the image that display device for mounting on vehicle demonstrates higher, colour gamut is wider.
Same, the backlight source module that the backlight source module providing in this case is display device for mounting on vehicle, comprises the above-mentioned light source of having applied red fluorescence powder and green emitting phosphor, makes the colorimetric purity of the image that display device for mounting on vehicle demonstrates higher, and colour gamut is wider.
Brief description of the drawings
In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is only embodiment of the present utility model, for those of ordinary skill in the art, do not paying under the prerequisite of creative work, other accompanying drawing can also be provided according to the accompanying drawing providing.
The encapsulating structure figure of a kind of vehicle LED light source that Fig. 1 provides for the utility model;
The encapsulating structure figure of the another kind of vehicle LED light source that Fig. 2 provides for the utility model;
The structural representation of a kind of vehicle-mounted backlight source module that Fig. 3 provides for the utility model;
Fig. 4 is the CIE two-dimensional chromaticity figure in color science.
Embodiment
Just as described in the background section, the colour gamut of the image that in prior art, display device for mounting on vehicle demonstrates is narrower, inventor finds, the reason that occurs above-mentioned phenomenon is, light source in the backlight using in existing display device for mounting on vehicle is the blue led chip that is coated with yellow fluorescent powder, the optical excitation yellow fluorescent powder sending by blue led chip produces white light, because described white light is the white light being mixed to form by blue light and sodium yellow, in display device for mounting on vehicle, also do not produce the vehicle-mounted light source of wide colour gamut, existing vehicle-mounted light source is applied in after display device for mounting on vehicle, in the image forming, red colorimetric purity and green colorimetric purity are not high enough, also be that described display device for mounting on vehicle shows that the colour gamut of image is narrower.
Based on this, inventor finds through research, and a kind of light source is provided, and is applied in display device for mounting on vehicle, comprising:
Light-emitting diode chip for backlight unit and be positioned at the fluorescent material on described light-emitting diode chip for backlight unit exiting surface;
Wherein, described fluorescent material is the mixed fluorescent powder of red fluorescence powder and green emitting phosphor, is called red green fluorescence powder.
From above-mentioned technical scheme, the light source of the display device for mounting on vehicle that the utility model provides comprises LED chip and is coated in the red fluorescence powder on described LED chip surface and the red green fluorescence powder of green emitting phosphor, although the light of the final outgoing of the light source that the utility model provides is at human eye or white light, but in described white light, the composition of red light and green light increases, in the image showing after display unit, can improve red and green colorimetric purity, thereby broadening show the colour gamut of image, make the display effect of display device for mounting on vehicle better.
It is more than the application's core concept, below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the utility model embodiment is clearly and completely described, obviously, described embodiment is only a part of embodiment of the present utility model, instead of whole embodiment.Based on the embodiment in the utility model, those of ordinary skill in the art are not making the every other embodiment obtaining under creative work prerequisite, all belong to the scope of the utility model protection.
A lot of details are set forth in the following description so that fully understand the utility model, but the utility model can also adopt other to be different from mode described here and implement, those skilled in the art can do similar popularization without prejudice to the utility model intension in the situation that, and therefore the utility model is not subject to the restriction of following public specific embodiment.
Secondly, the utility model is described in detail in conjunction with schematic diagram, in the time that the utility model embodiment is described in detail in detail; for ease of explanation; represent that the profile of device architecture can disobey general ratio and do local amplification, and described schematic diagram is example, it should not limit the scope of the utility model protection at this.In addition in actual fabrication, should comprise, the three-dimensional space of length, width and the degree of depth.
Specifically describe and in the utility model, be applied in backlight source module and the light source thereof in car-mounted device below by several embodiment.
The disclosed a kind of light source of the utility model embodiment, described light source applications is in display device for mounting on vehicle, and described light source as shown in Figure 1, comprising: light-emitting diode chip for backlight unit 21 and be positioned at the fluorescent material 22 of described light-emitting diode chip for backlight unit exiting surface side; Wherein, described fluorescent material 22 is the red green fluorescence powder of red fluorescence powder and green emitting phosphor.
Described display device for mounting on vehicle comprises the demonstration product that can use on automobile or similar tool movement, conveniently in motor racing, use, modal display device for mounting on vehicle is the display unit such as vehicle mounted MP 3, MP4, GPS, vehicle-carrying DVD, vehicle-mounted computer and in-car TV.Due to the application circumstances of display device for mounting on vehicle, require display device for mounting on vehicle to show that the colour gamut of image is wider, color is more bright-coloured, and color is truer.
It should be noted that, the LED chip of white is non-existent, seen in reality to the LED light source emitting white light be generally to cover yellow fluorescent powder on the LED chip of blue light-emitting, utilize blue light to excite yellow fluorescent powder luminous, then obtain white light with described blue light.The blue light of different wave length need to coordinate the yellow fluorescent powder of different wave length can obtain maximized white light, in the manufacturing process of LED light source, need to according to aim colour district (region in chromaticity coordinates) and adopt be the blue light of what wave band, could correspondingly choose corresponding yellow fluorescent powder, make LED light source finally launch the white light needing.
Be covered with yellow fluorescent powder and form white light because the LED chip for the coloured light that turns blue in prior art is coated with, in the time that the bulk concentration of yellow fluorescent powder is lower, the ratio of blue penetrating light is more, and entirety will be the white light of blue keynote; If when the bulk concentration of relative yellow fluorescent powder is higher, the ratio of yellow conversion light is more, and entirety is chloroaniline and adjusts to white light.In any case but regulate, can only make the light display of outgoing show partially blue or partially yellow, and can not be corresponding red the and green colorimetric purity of increase, the colour gamut that is the LED light source of the display device for mounting on vehicle of available technology adopting yellow fluorescent powder itself has limitation, can not meet the demonstration requirement of vehicle-mounted client to display device for mounting on vehicle, its display effect is poor.
And the light sending with LED chip again after adopting red fluorescence powder and green emitting phosphor to mix in the present embodiment excites, obtain white light.Because described red fluorescence powder and green emitting phosphor itself can be inspired ruddiness and green glow, then after the light sending with LED chip mixes, demonstrate corresponding white light.Regulate red fluorescence powder and green emitting phosphor consumption number, can control ruddiness and green glow proportion in the white light of described LED light source outgoing, thereby regulate redness while showing image in display device for mounting on vehicle and green colorimetric purity.
It should be noted that, red fluorescence powder described in the present embodiment and described green emitting phosphor can be red fluorescence powder and the green emitting phosphor in other backlights, and existing red fluorescence powder and green emitting phosphor can be realized the object that improves the display effect of display device for mounting on vehicle in the present embodiment.In composition the present embodiment of concrete red fluorescence powder and green emitting phosphor, do not limit, red fluorescence powder mainly contains: Ca
1-xsr
xs:Eu
2+, M
2si
5n
8: Eu
2+(M=Ca, Sr, Ba), Eu
3+and YVO
4: Bi
3+deng; Green emitting phosphor mainly contains: MSi
2n
2o
2: Eu
2+(M=Ca, Sr, Ba), M
2siO
4: Eu
2+(M=Ca, Sr, Ba) and SrGa
2s
4: Eu
2+deng.
In addition, because described red fluorescence powder and described green emitting phosphor are applied in car-mounted device, due to particular job environment of described car-mounted device, red fluorescence powder described in the present embodiment and green emitting phosphor are preferably has resistant to elevated temperatures red fluorescence powder and resistant to elevated temperatures green emitting phosphor, can be more high temperature resistant after car-mounted device thereby be applied in, improve the reliability of described light source, made described vehicle-mounted backlight source module there is higher temperature reliability, its longer service life.
Preferred in the present embodiment, described LED chip is the LED chip of transmitting blue light, colour mixture ejecting white light after excitated red fluorescent powder and green emitting phosphor.It should be noted that, described LED chip can also be purple LED chip or ultraviolet LED chip, does not limit, as long as can all can with the LED chip of red fluorescence powder and green emitting phosphor generation white light in the present embodiment, in addition, can also increase the fluorescent material of other colors.
It should be noted that, described light source also comprises the encapsulating shell for carrying described LED chip, and as shown in fig. 1, LED chip is positioned at described encapsulating shell 23, and fluorescent material 22 is also positioned at described encapsulating shell 23.In addition, the packaged type of light source described in the present embodiment is not defined as the packaged type of the direct coating fluorescent material shown in Fig. 1.Described light source can also be for as shown in Figure 2, comprise encapsulating shell 23, be positioned at the LED chip 21 of encapsulating shell 23 bottoms, be positioned at the fluorescent material 22 on the exiting surface of described LED chip 21, between described fluorescent material 22 and LED chip, also comprise silica gel 24, silica gel 24 is isolated fluorescent material 22 and LED chip completely, forms the encapsulating structure of overlay film heat isolation.Described light source can also be other structure, in the present embodiment, this is not limited.
In another embodiment of the utility model, provide a kind of backlight source module, the backlight source module that described backlight source module is display device for mounting on vehicle, described backlight source module as shown in Figure 3, comprising: light guide plate 31; The light source 32 that is positioned at described light guide plate outside, described light source 32 is the light source described in a upper embodiment.
Described light guide plate 31 comprises exiting surface, the end face vertical with described exiting surface and the relative bottom surface with described exiting surface; The outside that described light source can be positioned at the bottom surface of described light guide plate also can be positioned at the outside of one or more end faces of described light guide plate, in order to reduce the thickness of backlight source module, preferred in the present embodiment, as shown in Figure 3, described light source 32 is positioned at the end face outside of described light guide plate 31.
Described backlight source module, also comprises and is positioned at the diffusion barrier 33 of described light guide plate 31 exiting surfaces and is positioned at the surperficial multilayer bright enhancement film 35 that described diffusion barrier 33 deviates from described light guide plate 31.Wherein, described diffusion barrier 33 is plane or the cloudy surface with frosted particle towards the surface of light guide plate 31, the surface that deviates from light guide plate 31 is the cloudy surface with frosted particle, and light occurs when the diffusion barrier 33 repeatedly to reflect, reflection and scattering, is diffused film 33 and is converted to uniform area source.Bright enhancement film 35, for revising radiation direction, gathers light, by the light line of vision direction that leads, strengthens the brightness of backlight, or for reflecting the polarised light that can not be utilized, thereby re-used by light guide plate, to strengthen the brightness of backlight emergent light.In order to improve the efficiency of light energy utilization of described light guide plate 31, described backlight source module also comprises the reflector plate 34 of the bottom surface that is positioned at described light guide plate 31, reflector plate 34 is for reflexing to light guide plate by the light exposing from bottom surface of light guide plate, prevent light loss of energy, thereby improve the efficiency of light energy utilization of light guide plate, increase back light source brightness.
For vehicle-mounted backlight source module in the utility model and light source thereof the benefit with respect to vehicle-mounted backlight source module of the prior art and light source is described, inventor proves that the backlight source module providing in the present embodiment is applied in display device for mounting on vehicle by experiment, can improve the effect that display device for mounting on vehicle shows image, improve the colorimetric purity of its image.Concrete comparing result is as shown in the table:
The LED light source of table 1 coated red fluorescent material and green emitting phosphor shows image result contrast table with the LED light source that applies yellow fluorescent powder in display device for mounting on vehicle
| Contrast | Apply the LED of yellow fluorescent powder | The LED of coated red and green emitting phosphor |
| NTSC value | Can only accomplish 70% left and right | Can accomplish 80% left and right |
| Red wavelength | Can only accomplish below 610nm | Can accomplish 620nm left and right |
| Green purity | Can only accomplish below 80% | Can accomplish 80% left and right |
| Overall merit | Colour gamut is narrow, and display effect is general | Colour gamut is wider, and display effect is better |
Wherein, described NTSC value is: in CIE two dimension colo(u)r-mixture diagram, use by the triangle area red, green, blue three primary colors form and the ratio of a standard value and represent NTSC value, the larger expression device of NTSC value color is more bright-coloured.
Described CIE two dimension colo(u)r-mixture diagram is " CIE1931x, the y chromatic diagram " established in the 8th meeting of CIE held in Cambridge of Commission Internationale De L'Eclairage's (being called for short CIE) in 1931, is called for short " XYZ chromaticity diagram ", is international chromatic diagram at present.As shown in Figure 4, this horseshoe-shaped CIE two-dimensional chromaticity figure (also claiming chromaticity diagram), the whole colour gamuts that comprised visible ray, but it has only reflected form and aspect and the colorimetric purity of color, there is no luminance factor.CIE1931 chromatic diagram is the XYZ chromaticity diagram representing with nominal value, and x represents red component, and y represents green CIE1931 color space chromatic diagram component.E point represents white light, and its coordinate is (0.33,0.33); The color that is looped around color space edge is spectrum colour, and border represents the maximum saturation of spectrum colour, the wavelength of borderline numeral spectrum colour, and its profile comprises all perception tones.All monochromatic light is all positioned on ligulate curve, and this curve is exactly monochromatic track, and the numeral of the other mark of curve is monochromatic (or claiming spectrum colour) light wavelength value; The various actual colors of occurring in nature are all positioned at this closed curve; The physics three primary colors of selecting in RGB system are on the ligulate curve of chromatic diagram.
For ease of understanding, the CIE figure shown in each numerical value and Fig. 4 in associative list 1 describes comparing result.As shown in chart 1, the LED light source of coated red and green emitting phosphor irradiates after display device for mounting on vehicle, the red wavelength obtaining irradiates after display device for mounting on vehicle with respect to the LED light source that applies yellow fluorescent powder in prior art, the red wavelength obtaining is longer, in the CIE figure from Fig. 4, can find out, red wavelength is longer, its x coordinate figure is larger, just approaches pure red point, and red colorimetric purity is higher.And table in green colorimetric purity value directly provide, without seeing in conjunction with CIE figure.For NTSC value, due to described red wavelength and green colorimetric purity higher, the LED light source of coated red and green emitting phosphor is compared with applying the LED light source of yellow fluorescent powder, because red and green colorimetric purity uprise, also phase strain is large for the triangle area of these two kinds of colors and blue composition, must cause NTSC value to become large.
Comprehensive above-mentioned experimental result contrast is known, the vehicle-mounted backlight that the utility model provides and its light source, the NTSC value that has realized display device for mounting on vehicle is brought up to the object of 80% left and right by 70% left and right, be also that the colour gamut of display device for mounting on vehicle is wider, color of image is more bright-coloured, and display effect is better.
To the above-mentioned explanation of the disclosed embodiments, make professional and technical personnel in the field can realize or use the utility model.To be apparent for those skilled in the art to the multiple amendment of these embodiment, General Principle as defined herein can, in the situation that not departing from spirit or scope of the present utility model, realize in other embodiments.Therefore, the utility model will can not be restricted to these embodiment shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (5)
1. a light source, comprises red green fluorescence powder, light-emitting diode chip for backlight unit, it is characterized in that, described light source applications is in display device for mounting on vehicle, and the red green fluorescence powder of described light source is positioned at described light-emitting diode chip for backlight unit exiting surface side;
Described light-emitting diode chip for backlight unit is the light-emitting diode chip for backlight unit of transmitting blue light.
2. a backlight source module, is characterized in that, the backlight source module that described backlight source module is display device for mounting on vehicle, and described backlight source module comprises:
Light guide plate;
The light source that is positioned at described light guide plate outside, described light source is light source claimed in claim 1.
3. backlight source module according to claim 2, is characterized in that, described light guide plate comprises exiting surface, the end face vertical with described exiting surface and the relative bottom surface with described exiting surface; Described light source is positioned at the end face outside of described light guide plate.
4. backlight source module according to claim 3, is characterized in that, also comprises the diffusion barrier that is positioned at described light guide plate exiting surface and the multilayer bright enhancement film that is positioned at described diffusion barrier surface.
5. backlight source module according to claim 3, is characterized in that, also comprises the reflector plate that is positioned at described bottom surface of light guide plate.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320539530.4U CN203707182U (en) | 2013-08-30 | 2013-08-30 | Backlight module and light source thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320539530.4U CN203707182U (en) | 2013-08-30 | 2013-08-30 | Backlight module and light source thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203707182U true CN203707182U (en) | 2014-07-09 |
Family
ID=51057580
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109256458A (en) * | 2018-11-09 | 2019-01-22 | 深圳市迈森光电科技有限公司 | A kind of LED product encapsulating structure and its packaging method |
-
2013
- 2013-08-30 CN CN201320539530.4U patent/CN203707182U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109256458A (en) * | 2018-11-09 | 2019-01-22 | 深圳市迈森光电科技有限公司 | A kind of LED product encapsulating structure and its packaging method |
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Granted publication date: 20140709 |
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