CN102338297A - LED (Light-emitting Diode) backlight module and display equipment with same - Google Patents
LED (Light-emitting Diode) backlight module and display equipment with same Download PDFInfo
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- CN102338297A CN102338297A CN2010102338103A CN201010233810A CN102338297A CN 102338297 A CN102338297 A CN 102338297A CN 2010102338103 A CN2010102338103 A CN 2010102338103A CN 201010233810 A CN201010233810 A CN 201010233810A CN 102338297 A CN102338297 A CN 102338297A
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Abstract
The invention provides an LED (Light-emitting Diode) backlight module and display equipment with the same. The LED backlight module comprises a light guide panel and at least one LED light source arranged at one side of the light guide panel, wherein an adhesive tape is arranged between the LED light source and the light guide panel, and contains diffusate with light diffusing effect, and in addition, corrosion or frosting processing can be carried out to the light-emitting surface of the adhesive tape. In the invention, under the premise that the dimension and the cost of the LED backlight module are not increased, the phenomenon of Hot Sport in the existing backlight LED module can be effectively overcome; and in the LED backlight module disclosed by the invention, no air layer is produced between the LED light source and the light guide panel, so that the light loss which is caused by the air layer in the traditional structure is reduced, and simultaneously, the energy is saved.
Description
Technical field
The present invention relates to the LED applied technical field, specifically, the display device that relates to a kind of LED-backlit module and use this LED-backlit module.
Background technology
In recent years; LED (Light Emitting Diode; Light emitting diode) pollution-free because of it, color rendering good, advantage such as energy-conservation is widely used in lighting field, under the application of display devices such as LCD TV, laptop computer displays, LED has also replaced CCFL (Cold Cathode FluorescentLamp gradually; The cold cathode fluorescent lamp pipe), become the back light of main flow.But different with CCFL is, for the LED-backlit source of light inlet from the side, the lamp bar that a plurality of LED form is when luminous, because the luminous characteristics of LED self can form dark portion between two LED illuminating sources, and forms speck in the dead ahead of LED illuminating source.This phenomenon is called Hot Spot (focal point) or firefly phenomenon.This phenomenon can cause the edge brightness uniformity of display devices such as LCD TV to reduce, thereby influences the whole image quality.
Represented that as Fig. 1 is simple and easy the schematic diagram of Hot Spot phenomenon appears in a LED-backlit module; As shown in Figure 1; A plurality of LED illuminating sources 1 see through air layer 2 and shine LGP 3; The scope of luminous range of exposures shown in arrow of each LED illuminating source 1 will form HotSpot zone 4 and dark portion regional 5 at the LGP light in part like this.
For this problem, general improvement mode has following several kinds at present:
Arrange in the site of 1, improving the LGP light in part;
2, under the constant situation of the picture dimension that guarantees display device, delay the firefly phenomenon through the size that adds length/width LGP (incident side);
3, when the LGP size constancy, the shell that increases display device is covered up the firefly phenomenon to the extension of picture;
4, reflective adhesive tape of increase or extinction adhesive tape suppress the firefly phenomenon on the LGP exiting surface above the LGP light in part, below the diffusion sheet.
Yet; Present technology trends is that the thickness of the various display devices of requirement is more and more thinner; Therefore require corresponding module thickness backlight also more and more thinner, especially when the light guide plate of module backlight during less than 1mm, Hot Spot phenomenon has been difficult to 1 solution by the way.Above-mentioned improvement mode 2 delays the firefly phenomenon through the size that increases LGP (incident side) length/width; Be not only LGP but this mode increases; Corresponding with it; Also need increase a series of size of devices such as metal backing, reflector plate, prismatic lens, brightening piece, plastic cement frame, metal crimp component and housing, thereby increase the cost of module backlight.3 of improvement modes have directly reduced the picture dimension that the consumer buys, and influence the attractive in appearance of display device.In improvement mode 4, no matter above the LGP light in part, increasing reflective adhesive tape still is the extinction adhesive tape, all can reduce the size that the consumer buys picture, increases module thickness backlight.
Do not increase size and cost so the needs design is a kind of, and do not influence the attractive in appearance of display device, but can be good at solving the module backlight of Hot Spot phenomenon.
Summary of the invention
The present invention be directed to the Hot Spot phenomenon that exists in the LED-backlit module in the prior art proposes; Its purpose is to provide a kind of size and cost of not increasing; And do not influence the attractive in appearance of display device, but can solve the LED-backlit module of Hot Spot phenomenon and the display device of using this LED-backlit module well.
LED-backlit module provided by the invention comprises LGP and at least one the LED illuminating source that is arranged on said LGP one side; Wherein between LED illuminating source and said LGP, also be provided with adhesive tape, said adhesive tape contains the diffusion matter with light diffusion effect.
In addition, preferred construction is, is being provided with reflective adhesive tape on the side away from said LED illuminating source on the one side of said adhesive tape and the said LGP; Be provided with reflector plate in said adhesive tape and the relative another side of said reflective adhesive tape; And said LGP is carried by said reflector plate.
In addition; The present invention also provides other a kind of LED-backlit module, comprises LGP and at least one the LED illuminating source that is arranged on said LGP one side, wherein; Between said LED illuminating source and said LGP, also be provided with adhesive tape, the exiting surface of said adhesive tape is handled through excessive erosion or frosted.
On the other hand, the present invention also provides a kind of display device of LED-backlit module, comprising:
Aforesaid LED-backlit module; And
The diffusion sheet, prismatic lens and the two-way brightening piece that set gradually from inside to outside in a side of LGP bright dipping;
Light from the outgoing of LGP upper surface; Form uniform surface light source via diffusion sheet diffusion back; Again by prismatic lens with the direction of ray-collecting to outgoing, will be adjusted into the light of the needed polarization direction of polaroid under the liquid crystal panel that meets display device by the light that prismatic lens is collected by having the two two-way brightening pieces that utilize of P, S light again.
In addition; Preferred construction is; Display device also comprises plastic cement frame, metal bead, metallic support and the chassis of fixing said LED-backlit module and said diffusion sheet, prismatic lens, two-way brightening piece; Wherein said metal bead is used for fixing the whole liquid crystal panel of said LED-backlit module, and said metal bead and said plastic cement frame are fixed on the said metallic support, and said metallic support is fixed on the chassis.
After adopting above-mentioned technical scheme; Can under the prerequisite that does not increase LED-backlit module size and cost, overcome the Hot Spot phenomenon in the existing LED-backlit module effectively; And in the LED-backlit module of this structure; Do not have air layer between LED illuminating source and the LGP, reduced in the traditional structure light loss consumption that the existence because of air layer causes, practiced thrift the energy simultaneously.
Description of drawings
Through below in conjunction with accompanying drawing embodiment being described, above-mentioned characteristic of the present invention and technological merit will become apparent and understand easily.
Fig. 1 is the luminous sketch map of the LED-backlit module of expression conventional art.
Fig. 2 is the luminous sketch map of the embodiment of the invention one LED-backlit module;
Fig. 3 is distribution of light figure in the embodiment of the invention one LED-backlit module adhesive tape;
Fig. 4 is a kind of concrete structure sketch map of the embodiment of the invention one LED-backlit module;
Fig. 5 is a concrete structure sketch map of using a kind of display device of the embodiment of the invention one LED-backlit module;
Fig. 6 is the embodiment of the invention two LED-backlit module adhesive tape exiting surface distribution of light figure.
The specific embodiment
In order to make the object of the invention, technical scheme and beneficial effect more cheer and bright, the present invention is done further detailed description below in conjunction with accompanying drawing and specific embodiment.
Embodiment one
Fig. 2 is the luminous sketch map of the expression embodiment of the invention one LED-backlit module, and Fig. 3 is distribution of light figure in the embodiment of the invention one LED-backlit module adhesive tape.
Like Fig. 2, shown in Figure 3, the LED-backlit module comprises a plurality of LED illuminating sources 1 and LGP 3, and a plurality of LED illuminating sources 1 are arranged at the side of LGP 3; Between LED illuminating source 1 and LGP 3, be provided with adhesive tape 7, and adhesive tape 7 contains the diffusion matter 8 with light diffusion effect.After getting into adhesive tape 7 from the light of LED illuminating source 1 outgoing, a part of light directly sees through adhesive tape 7 and after the another side outgoing of adhesive tape 7, gets into LGP 3, gets into LGP 3 from the adhesive tape another side again after the diffusion of a part of light through diffusion matter 8 in the adhesive tape 7.
For reaching optimum optical effect; In a preferred implementation of the present invention; The width that is arranged on the adhesive tape 7 between LED illuminating source 1 and the LGP 3 is generally less than 2mm, and maximum is no more than the width that plastic cement frame (with reference to Fig. 5) that the LED-backlit module installed stretches into picture.In a specific embodiment of the present invention, adhesive tape 7 selects for use refractive index and LGP refractive index basically identical (being generally refractive index about 1.48), light transmittance in the silica gel more than 90% or other glue classes.
In a specific embodiment of the present invention, adopt the technology that spreads will spread matter 8 and insert in the adhesive tape 7, and can be according to the diffusion effect of needs adjustment diffusion matter 8 in adhesive tape 7 of specific product.The diffusion effect that diffuses into diffusion matter 8 in the adhesive tape 7 can have at least following three kinds of modes to adjust:
1) adds S in liquid (optical ink or the pure colloid) lining of glue
iO
2Powder.Because S
iO
2Have the light diffusion effect, so S
iO
2Addition is many more, and diffusion effect is obvious more.
At this, the glue viscosity generally about 5000cps, after evenly stirring, through using IR (infrared ray) baking oven, made glue solidify in 30-60 minute 50 ℃-100 ℃ bakings; Perhaps through using the exposure of UV (ultraviolet ray) exposure machine that glue is solidified, using the time of UV exposure machine exposure is about 30 minutes.
Before colloid solidified, the glue viscosity generally about 5000cps, can come if shorten hardening time through the use amount that reduces the solvent of regulating the glue viscosity, and the solvent of regulating the glue viscosity can vapor away in the glue solidification process.
2) under the situation of optical ink components unchanged, increase adhesive tape thickness.Owing to contain S in the optical ink
iO
2Deng the light diffusate, therefore increasing adhesive tape thickness is equivalent to increase S
iO
2Use amount, thus diffusion effect increased.
In addition; For the light that LED illuminating source 1 is sent is obtained diffusion effect preferably through adhesive tape 7 time; In a preferred implementation of the present invention, the nanometer that diffusion matter 8 is preferably at least a material among SiO2, TiO2, SnO2, CaCO2, Nb2O5, ZnO2, MgF2, CeO2, Al2O3, HfO2, Na3LaF6, the LaF6 is to micron powder.
Fig. 4 is a kind of concrete structure sketch map of the embodiment of the invention one LED-backlit module.As shown in Figure 4; LED illuminating source 1 is installed on the aluminium base 10; Adhesive tape 7 is arranged between LED illuminating source 1 and the LGP 3, and the LED illuminating source can utilize aluminium base 10 heat radiations with better radiating effect, and light is injected LGP 3 through adhesive tape 7.Diffuse into diffusion matter 8 in the adhesive tape 7, and the one side of adhesive tape 7 is adhesive with the reflective adhesive tape 13 of one deck, is provided with reflector plate 15 with reflective adhesive tape 13 relative another sides on the adhesive tape 7 with light diffusion effect.And also carry on the reflector plate 15 and adhesive tape 7 tight adjacent LGPs 3; That is to say; Reflector plate 15 carries adjacent adhesive tape 7 and LGP 3 simultaneously; Thereby be respectively the light cremasteric reflex face of injecting adhesive tape 7 and LGP 3 lower surfaces, with the exitance of increase light, thus the utilization rate of raising light.
In order not increase the thickness of LED-backlit module and display device, and dwindle the vertical lighting angle of LED, make more light be transferred to picture central authorities, the cumulative thickness of adhesive tape 7 and reflective adhesive tape 13 is no more than the thickness of LGP 3.The accumulation direction that vertically is adhesive tape 7 and reflective adhesive tape 13 among Fig. 4.
In addition; Reflective adhesive tape 19 also is being installed on away from the side of LED illuminating source 1 on the LGP 3; At work; Be reflected sheet 15 and DOT17 of the light that incides LGP 3 lower surfaces reflexes to the upper surface of LGP 3, is transferred to LGP is reflexed to LGP 3 once more by reflective glue 19 bands away from the light on the side of LED illuminating source 1 upper surface; In addition reflective adhesive tape 13 and reflector plate 15 also will reach adhesive tape 7 from the light of LED illuminating source 1 outgoing for the first time adhesive tape 7 in upper surface and lower surface and angle be less than the whole reflected back adhesive tape 7 of the light of the angle of total reflection, and through being transferred in the LGP 3 after adhesive tape 7 interior the diffusions.Through the synergy of above reflective adhesive tape 13, reflective adhesive tape 19 and reflector plate 15, just can the light from 1 outgoing of LED illuminating source all be conducted, reflex to the upper surface of LGP 3 through adhesive tape 7 and LGP 7, thereby improved the utilization rate of light.
At last, components such as above-mentioned aluminium base 11, adhesive tape 7, LGP 3 and reflector plate 15 further are fixedly mounted on have just constituted a LED-backlit module as shown in Figure 4 above the metal chassis 16.
In a preferred implementation of the present invention; The binder of nanometer to the micron powder that reflective adhesive tape 13 and reflective adhesive tape 19 materials can be SiO2, TiO2, SnO2, CaCO2, Nb2O5, ZnO2, MgF2, CeO2, Al2O3, HfO2, Na3LaF6, LaF6TiO2 at least a materials wherein or the micro-foaming material of other nanometers to micron order high index of refraction knot and high transmission rate; Paste on the film substrate through roll extrusion or compound mode and to form, film substrate generally is made up of one or more synthetic material among PET, PVC, PC, PBT, PE, PP, PMMA, the ABS.
Above-mentioned LED-backlit module provided by the invention is provided with the adhesive tape 7 that diffuses into the diffusion matter with light diffusion effect between LED illuminating source 1 and LGP 3; Can under the prerequisite that does not increase LED-backlit module size and cost, overcome the Hot Spot phenomenon in the existing LED-backlit module effectively; And in the LED-backlit module of this structure; There is not air layer between LED illuminating source and the LGP; Reduce in the traditional structure light loss consumption that the existence because of air layer causes, practiced thrift the energy simultaneously.
Fig. 5 is a concrete structure sketch map of using a kind of display device of the embodiment of the invention one LED-backlit module.As shown in Figure 5; Display device comprises plastic cement frame 23; LED-backlit module shown in Fig. 4 is installed in the plastic cement frame 23; Aluminium base 10 is fixing by plastic cement frame 23 as the outer of LED-backlit module with reflective adhesive tape 19; And the side in LGP 3 bright dippings is equipped with diffusion sheet 20, prismatic lens 21 and two-way brightening piece 22 from inside to outside successively, from the light of LGP upper surface outgoing, forms uniform surface light source via diffusion sheet 20 diffusion backs; Again by prismatic lens 21 with the direction of ray-collecting to outgoing, will be adjusted into the light of the needed polarization direction of polaroid under the liquid crystal panel that meets display device by the light that prismatic lens 21 is collected by having the two two-way brightening pieces 22 that utilize of P, S light again.
Diffusion sheet 20 wherein, prismatic lens 21 can be according to the demand additional quantity or the adjustment orders of actual product, and two-way brightening piece 26 also can be confirmed to have or not according to the actual demand of product.
Liquid crystal panel in the display device comprises the electrode district 25 and middle effective viewing area 26 that is positioned at periphery, in addition, is provided with the polaroid (not shown) in the upper and lower surface sea of liquid crystal panel.Diffusion sheet 20, prismatic lens 21 and two-way brightening piece 22 are fixing by plastic cement frame 23, and liquid crystal panel is fixed in the plastic cement frame 23, and the width of the electrode district 25 of liquid crystal panel stretches into the width of picture greater than plastic cement frame 23, and greater than the width of adhesive tape 7.Whole liquid crystal panel is fixing by metal bead 27, and metal bead 27 is fixed on the metallic support 24 with plastic cement frame 23, and metallic support 24 is fixed on the chassis 16.
Embodiment two
Fig. 6 is case study on implementation two LED-backlit module adhesive tape exiting surface distribution of light figure of the present invention.As shown in Figure 6, similar with embodiment one is, the LED-backlit module comprises a plurality of LED illuminating sources 1 and LGP 3, and a plurality of LED illuminating sources 1 are arranged at the side of LGP 3; Between LED illuminating source 1 and LGP 3, be provided with adhesive tape 7.Different with embodiment one is, does not contain diffusion matter in the adhesive tape 7 in the present embodiment two, does corrosion on the exiting surface 28 of LGP 3 one sides or frosted is handled but close in adhesive tape 7.Rely on this structure; After the light entering adhesive tape 7 of LED illuminating source 1 outgoing, diffusion can take place in emergent ray when directive exiting surface 28, thereby makes the area source of the exiting surface formation homogeneous of adhesive tape 7; Reduce Hot Spot, and then improve the uniformity of the brightness of the light that penetrates LGP.
In addition; The present invention also can integrate the characteristics of embodiment one and embodiment two; Spread matter, simultaneously the exiting surface of adhesive tape done corrosion or frosted processing in the adhesive tape set inside; Under high perhaps the less demanding situation of light-source brightness, adopt the adhesive tape of exiting surface corrosion or frosted can better solve Hot Spot phenomenon to the picture center brightness.
LED-backlit module provided by the invention can be applied to various display devices such as LCD TV, notebook display; Can overcome the Hot Spot phenomenon in the display device effectively; And do not increase the size and the production cost of end product, and can improve luminous efficiency, energy savings.
Though described the principle of the present invention and the specific embodiment to this new LED back light module unit structure and the display device of using this LED-backlit module above; But, it will be understood by those skilled in the art that the just better the object of the invention of explaining of above-mentioned specific descriptions; And be not to qualification of the present invention; Under above-mentioned instruction of the present invention, those skilled in the art can carry out various improvement and distortion on the basis of the foregoing description, and these improvement and distortion; All drop in protection scope of the present invention, protection scope of the present invention is limited claim and equivalent thereof.
Claims (10)
1. a LED-backlit module comprises LGP and at least one the LED illuminating source that is arranged on said LGP one side, it is characterized in that,
Between said LED illuminating source and said LGP, also be provided with adhesive tape, said adhesive tape contains the diffusion matter with light diffusion effect.
2. according to the described LED-backlit module of claim 1, it is characterized in that,
The nanometer that said diffusion matter is at least a material among SiO2, TiO2, SnO2, CaCO2, Nb2O5, ZnO2, MgF2, CeO2, Al2O3, HfO2, Na3LaF6, the LaF6 is to micron powder.
3. according to the described LED-backlit module of claim 1, it is characterized in that,
Said adhesive tape is that the refractive index basically identical, light transmittance of refractive index and said LGP is at the silica gel more than 90%.
4. according to the described LED-backlit module of claim 1, it is characterized in that,
Be provided with reflective adhesive tape on the side away from said LED illuminating source on the one side of said adhesive tape and the said LGP;
Be provided with reflector plate in said adhesive tape and the relative another side of said reflective adhesive tape; And
Said LGP is carried by said reflector plate.
5. according to the described LED-backlit module of claim 1, it is characterized in that,
Lower surface at said LGP is provided with the site of light towards the scattering of LGP upper surface.
6. according to the described LED-backlit module of claim 1, it is characterized in that,
Said reflective adhesive tape is pasted on the film substrate through roll extrusion or compound mode by the binder of the micro-foaming material knot of nanometer to the micron powder of at least a material among SiO2, TiO2, SnO2, CaCO2, Nb2O5, ZnO2, MgF2, CeO2, Al2O3, HfO2, Na3LaF6, the LaF6TiO2 or other nanometers to micron order high index of refraction and high transmission rate and is formed.
7. according to the described LED-backlit module of claim 1, it is characterized in that,
Said LED illuminating source is installed on the aluminium base.
8. a LED-backlit module comprises LGP and at least one the LED illuminating source that is arranged on said LGP one side, it is characterized in that,
Between said LED illuminating source and said LGP, also be provided with adhesive tape, the exiting surface of said adhesive tape is handled through excessive erosion or frosted.
9. the display device of a LED-backlit module comprises:
Like each described LED-backlit module in the claim 1～8; And
The diffusion sheet, prismatic lens and the two-way brightening piece that set gradually from inside to outside in a side of LGP bright dipping;
Light from the outgoing of LGP upper surface; Form uniform surface light source via diffusion sheet diffusion back; Again by prismatic lens with the direction of ray-collecting to outgoing, will be adjusted into the light of the needed polarization direction of polaroid under the liquid crystal panel that meets display device by the light that prismatic lens is collected by having the two two-way brightening pieces that utilize of P, S light again.
10. according to the described display device of claim 9, also comprise:
Plastic cement frame, metal bead, metallic support and the chassis of fixing said LED-backlit module and said diffusion sheet, prismatic lens, two-way brightening piece; Wherein said metal bead is used for fixing the whole liquid crystal panel of said LED-backlit module; Said metal bead and said plastic cement frame are fixed on the said metallic support, and said metallic support is fixed on the chassis.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010102338103A CN102338297A (en) | 2010-07-22 | 2010-07-22 | LED (Light-emitting Diode) backlight module and display equipment with same |
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| CN2010102338103A CN102338297A (en) | 2010-07-22 | 2010-07-22 | LED (Light-emitting Diode) backlight module and display equipment with same |
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| CN102606947A (en) * | 2012-02-28 | 2012-07-25 | 深圳市华星光电技术有限公司 | Backlight module |
| CN102943985A (en) * | 2012-11-29 | 2013-02-27 | 深圳市华星光电技术有限公司 | Backlight module and display device thereof |
| CN102967896A (en) * | 2012-11-19 | 2013-03-13 | 京东方科技集团股份有限公司 | Light guide plate, backlight module and display device |
| CN103511920A (en) * | 2012-06-18 | 2014-01-15 | 纬创资通股份有限公司 | Backlight module and display device thereof |
| CN103791455A (en) * | 2014-02-14 | 2014-05-14 | 京东方科技集团股份有限公司 | Side edge type backlight module and manufacturing method thereof and display device |
| CN104272016A (en) * | 2012-05-07 | 2015-01-07 | 科技信光控板有限公司 | Light guide plate structure controlling uniformity from central portion to edge, and lighting lamp using same |
| CN110456563A (en) * | 2019-07-30 | 2019-11-15 | 武汉华星光电技术有限公司 | Backlight module and liquid crystal display device |
| CN110969957A (en) * | 2018-09-28 | 2020-04-07 | 深圳光峰科技股份有限公司 | LED display screen |
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| CN102606947B (en) * | 2012-02-28 | 2016-06-01 | 深圳市华星光电技术有限公司 | Backlight module |
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| CN103791455B (en) * | 2014-02-14 | 2017-12-08 | 京东方科技集团股份有限公司 | Side backlight module and preparation method thereof, display device |
| CN103791455A (en) * | 2014-02-14 | 2014-05-14 | 京东方科技集团股份有限公司 | Side edge type backlight module and manufacturing method thereof and display device |
| CN110969957A (en) * | 2018-09-28 | 2020-04-07 | 深圳光峰科技股份有限公司 | LED display screen |
| CN110456563A (en) * | 2019-07-30 | 2019-11-15 | 武汉华星光电技术有限公司 | Backlight module and liquid crystal display device |
| WO2021017249A1 (en) * | 2019-07-30 | 2021-02-04 | 武汉华星光电技术有限公司 | Backlight module and liquid crystal display device |
| US11314126B2 (en) * | 2019-07-30 | 2022-04-26 | Wuhan China Star Optoelectronics Technology Co., Ltd. | Backlight module and liquid crystal display device |
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Application publication date: 20120201 |