CN1996122A - Back light module - Google Patents
Back light module Download PDFInfo
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- CN1996122A CN1996122A CN 200610171479 CN200610171479A CN1996122A CN 1996122 A CN1996122 A CN 1996122A CN 200610171479 CN200610171479 CN 200610171479 CN 200610171479 A CN200610171479 A CN 200610171479A CN 1996122 A CN1996122 A CN 1996122A
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- light
- guide plate
- backlight module
- light source
- light guide
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Abstract
The aphototropic module comprises at least a light conductive plate, a light source at one side of the light conductive plate, a diffusion plate above the light conductive plate without touching the light conductive plate and the said light source, a mixed light space between the light conductive plate and diffusing plate to let the lights mixing adequately and diffused out by the diffusing plate. It can provide ideal light distribution and mixed and even white light source.
Description
Technical field
The invention provides a kind of backlight module, refer to especially a kind ofly have the mixed light space and be located at backlight module between light guide plate and the diffuser plate.
Background technology
Along with today electronic product flourish, the display device that is used as one of man-machine interface is also more and more strict for the requirement of quality.Wherein liquid crystal indicator is owing to have excellent speciality such as radiationless property, light-duty thinning, low-energy-consumption, therefore become the main flow in market gradually, be widely used in mobile computer (notebook), personal digital assistant (personal digital assistant, PDA), on the portable electronic information products such as digital camera and mobile phone.Because display panels is passive luminous flat display apparatus, therefore a backlight need be set at the display panels back side usually shows required light so that picture to be provided.
The backlight module of tradition liquid crystal indicator is to be light source with the cold cathode fluorescent lamp pipe.With general direct type backlight module is example, a plurality of cold cathode fluorescent lamp pipes are to be set in parallel in the backlight module bottom side by side, so that a plurality of linear light sources to be provided, cold cathode fluorescent lamp pipe top then is provided with a diffuser plate or plural pieces blooming piece, provides the even brightness area source with diffusion light.Owing to the backlight module that with the cold cathode fluorescent lamp pipe is light source has developed for a good while, no matter therefore be diffuser plate or all existing very ripe design of blooming piece, make backlight module can provide the display panels illumination effect good backlight at the linear light source design.Yet the volume of cold cathode fluorescent lamp pipe is big, luminous temperature height, and can limit the improvement of LCD color specification, so the light source of cold cathode fluorescent lamp pipe can't be met customer need gradually.In addition, the cold cathode fluorescent lamp pipe itself contains mercury, does not meet the requirement as green product.So in recent years, light emitting diode (light emitting diode with advantages such as the fast and volume of color saturation height, reaction rate are little, LED) be widely used in using as light source in the backlight module, make in the liquid crystal indicator of small-medium size very popularly, and industry is is also constantly researched and developed in the backlight module of large scale liquid crystal display device and to be used LED to replace traditional cold cathodouminescence fluorescent tube.Yet, because white light emitting diode sends the also prematurity still of saturated white light technology, so be in backlight module, to use ruddiness, green glow and blue light-emitting diode as light source simultaneously in many products.In the case, in order to make ruddiness, green glow and the abundant mixed light of blue light light, the mixed light design of good just must be arranged, so the price that the backlight module of LED-type needs the complicated mechanical structure and is higher than cold cathode fluorescent lamp pipe backlight module.
Please refer to Fig. 1, Fig. 1 is the existing diagrammatic cross-section of using light emitting diode as the backlight module of light source.Existing backlight module 10 is a bottom-lighting type back light module, and it is to be applied in the large scale liquid crystal display device, for example flat-surface television.Backlight module 10 includes a framework 12, a diffuser plate 20 is located at framework 12 tops and a plurality of top emission type led light source 14 is located among the framework 12, and be welded on the printed circuit board (PCB) 18, wherein led light source 14 includes red-light LED, blue-ray LED and green light LED and is uniformly distributed within the framework 12, offers display panels so that form white light source behind ruddiness, green glow and the blue light mixed light.In addition, existing backlight module 10 can comprise a reflector plate 16 or reflecting material is arranged on the printed circuit board (PCB) 18 in addition.Because the backlight module thickness of general closed planar TV approximately has only 2 centimetres, therefore in order to make backlight illumination even, backlight module 10 must usage quantity more but led light source 14 that electric current is less (for example 20 milliamperes) be arranged in the backlight module 10.In this design, the light that led light source 14 is produced can be directly luminous towards the light-emitting area of backlight module 10, so luminescence efficiency is higher, and equally distributed led light source 14 can have better radiating effect.Yet a fairly large number of led light source 14 can increase the cost of whole backlight module 10 in this structure.And, according to the structural design of backlight module 10, can produce the uneven problem of mixed light, this external led light source 14 the aspect is set, must use red-light LED, blue-ray LED and the green light LED of specific light source wavelength coverage or power to arrange in pairs or groups, cause managerial difficulty as light source.
Moreover, existing backlight module has research and development to be located at the high-capacity LED surface with the prism of the high-capacity LED (for example 350 milliamperes) of negligible amounts and the particular design of arranging in pairs or groups in addition provides light source, yet this kind design must increase the thickness of whole backlight module, and be difficult in addition radiating modules such as heat pipe or fan being set because of dispelling the heat, increase material cost.In addition, the prism of particular design has patent protection usually, also can improve the manufacturing cost of whole backlight module.
In sum, for display or backlight module industry, design that to have LED-backlit module with low cost and that mixed light is respond well still be an important problem.
Summary of the invention
Fundamental purpose of the present invention is to provide a kind of backlight module with mixed light space and light guide plate, to solve the problem of above-mentioned existing backlight module.
According to claim of the present invention, be to disclose a kind of backlight modular structure, this backlight module comprises at least one light guide plate, at least one light source and is located at a side, of light guide plate and is located at the diffuser plate and a mixed light space of light guide plate top and is located between light guide plate and the diffuser plate.Wherein, light guide plate comprises an incidence surface and an exiting surface, and the light that light source produced is to be entered in the light guide plate by incidence surface, and diffuser plate does not directly contact light guide plate and light source.In addition, the mixed light space is between diffuser plate and this light guide plate, this light source, makes that the light that penetrates from the light guide plate exiting surface can be in the mixed light space fully behind the mixed light, penetrates backlight module by diffuser plate again.
Because backlight module of the present invention comprises a light guide plate, and light source is a side of being located at light guide plate, so light can provide desirable distribution of light via the light guide plate effect.Moreover this case backlight module comprises the mixed light space of being located between light guide plate and the diffuser plate in addition, makes the light that is penetrated by light guide plate to enter in the diffuser plate by abundant mixed light in the mixed light space, so even light mixing and the preferable white light source of colour gamut can be provided again.
Description of drawings
Fig. 1 is the existing diagrammatic cross-section of using light emitting diode as the backlight module of light source.
Fig. 2 is the diagrammatic cross-section of first embodiment of backlight module of the present invention.
Fig. 3 is the vertical view of backlight module shown in Figure 2.
Fig. 4 is the diagrammatic cross-section of second embodiment of backlight module of the present invention.
Fig. 5 is the diagrammatic cross-section of the 3rd embodiment of backlight module of the present invention.
Fig. 6 is the diagrammatic cross-section of the 4th embodiment of backlight module of the present invention.
Drawing reference numeral:
10 backlight modules, 12 frameworks
14 light sources, 16 reflector plates
18 printed circuit board (PCB)s, 20 diffuser plates
50 backlight modules, 52 frameworks
54 light sources, 56 light guide plate
58 reflector plates, 60 diffuser plates
62 mixed light spaces, 64 accommodation spaces
66 leaded light patterns, 68 incidence surfaces
70 exiting surfaces, 72,74 class linear light sources
100 backlight modules, 102 frameworks
104 light sources, 106 light guide plate
108 reflector plates, 110 diffuser plates
112 mixed light spaces, 114 accommodation spaces
118 incidence surfaces, 120 exiting surfaces
122 reflectings surface, 124 supporting constructions
126 depressions
Embodiment
Backlight module of the present invention needs in the display device of light source applicable to liquid crystal indicator or other.Please refer to Fig. 2 and Fig. 3, Fig. 2 is the diagrammatic cross-section of first embodiment of backlight module of the present invention, and Fig. 3 is the vertical view of backlight module shown in Figure 2.Backlight module 50 of the present invention is a bottom-lighting type back light module, can be applicable to small size in addition in, in the large scale liquid crystal display device.Backlight module 50 comprises that a framework 52, a plurality of light guide plate 56 are arranged side by side in the bottom of backlight module 50, a plurality of light source 54, a diffuser plate 60 and a mixed light space 62.Wherein, framework 52 comprises at least four sidewalls and forms an accommodation space 64, is used for holding light source 54, light guide plate 56 and diffuser plate 60.
Each light guide plate 56 includes an incidence surface 68 and 70 perpendicular joining an of exiting surface, and light guide plate 56 surfaces include a plurality of leaded light patterns 66, is used for adjusting the direct of travel of light, and light is advanced to exiting surface 70.Diffuser plate 60 is located at light guide plate 56 tops and is not contacted light guide plate 56 and light source 54.Light source 54 is a point-like light source or a directive property light source, for example is 100 milliamperes led light source, and a contiguous side of being located at light guide plate 56 makes light source 54 light that produces directly to be entered in the light guide plate 56 by incidence surface 68, via being penetrated by exiting surface 70 after the scattering again.In the present embodiment, light source 54 comprises red-light LED 54a, green light LED 54b and blue-ray LED 54c, staggered incidence surface 68 sides that are parallel to light guide plate 54.Yet in other embodiments, light source 54 also can be white light source.
In addition, in the accommodation space 64 of mixed light space 70 between diffuser plate 60 and light guide plate 56, light source 54, make that the light that penetrates from this exiting surface 70 can be mixed light space 62 in fully behind the mixed light, again by diffuser plate 60 ejaculation backlight modules 50.Backlight module 50 can comprise the below that a reflector plate 58 is located at light source 54 and light guide plate 56 in addition, in order to the upwards reflection of light that will march to backlight module 50 bottoms, to improve light utilization.In other embodiments, can be provided with a plurality of blooming pieces (figure do not show) on the diffuser plate 60 in addition, for example prismatic lens or brightness enhancement film (brightness enhancement film, BEF) etc., to improve the brightness of backlight that backlight module is provided.
As shown in Figure 2, leaded light pattern 66 can be V-groove or U type groove, is arranged at the bottom surface of light guide plate 56, so that light penetrates to exiting surface 70 light harvestings, and then replaces the use of BEF and reduces cost.Yet in different embodiment, leaded light pattern 66 also can be printing-ink pattern, sand blasting pattern or site ejection formation, is used for destroying the total reflection of light and makes its exiting surface 70 of light directive in the light guide plate 56.And, but also local distribution is on the different surfaces of light guide plate 56 for leaded light pattern 66, and the Luminance Distribution of the light of light guide plate 56 is left on exiting surface 70 surfaces for example with adjustment.It should be noted that, demonstrate the main course of light in light guide plate 56 that penetrates by light source 54 with arrow among the figure, by the design of leaded light pattern 66, the specific part that can make most of light concentrate on exiting surface 70 leaves light guide plate 56, as the part that is represented by dotted lines among Fig. 3.Because light all concentrates on the specific part of exiting surface 70 and penetrates, therefore the light that is penetrated by light guide plate 56 can form a plurality of class linear light sources (line-like line source) 72,74, make light source speciality that backlight module 50 provided as existing with the situation of cold cathode fluorescent lamp pipe as light source.Yet the quantity that forms class linear light sources 72,74 on light guide plate 56 surface determines according to the physical size of product and design.Moreover in different embodiment, the light guide plate 56 of backlight module 50 of the present invention also can be the strip light guide plate, so the end face exiting surface 70 of light guide plate 56 also has the strip shape, makes the light that penetrates light guide plate 56 form the class linear light source naturally.Because the class line source that backlight module 50 of the present invention can provide similar lamp tube light source to produce, therefore the design of the diffuser plate 60 in the backlight module 50 or other optical thin film can be continued to use the very design of ripe traditional cold cathodouminescence light tube backlight module of development, to reach the effect of saving exploitation and material cost.
On the other hand, because the light source 54 of present embodiment be the directive property light source, light can and enter in the light guide plate 56 by its side generation, so the top of light source 54 can't produce light, and forms blanking bar easily.Yet being provided with of mixed light of the present invention space 62 can make light after penetrating light guide plate 56, abundant mixed light and also provide uniform light, last light to enter again in the diffuser plate 60 in light source 54 tops, and evenly the diffusion back forms the average area source of brightness.
Because the power of the backlight module of 20 milliamperes of led light sources of the existing use of led light source 54 used herein is bigger, the light source 54 that therefore negligible amounts can be set just can reach same luminous efficacy, and then the reduction packaging cost, and its radiating effect is good in the existing backlight module that uses high-power LED light source.Moreover, light guide plate 56 is arranged at the mixed light effect that led light source 54 1 sides can be improved light, scopes such as the wavelength of the light source 54 that make to be suitable for, brightness are bigger, are convenient to design management, and can select cheap according to need and meet the light source 54 of design.
Please refer to Fig. 4, Fig. 4 is the synoptic diagram of second embodiment of backlight module of the present invention, and for ease of explanation, the device of present embodiment backlight module is an element numbers of continuing to use Fig. 3.In the present embodiment, light source 54 is the double-side light source, is located among adjacent two light guide plate 56.Therefore the incidence surface 68 of light guide plate 56 then is located at the both sides of light source 54 relatively, and the light that is produced by the light source 54 of double-side can be injected in the light guide plate 56 by the incidence surface 68 of left and right sides light guide plate 56 respectively.The advantage of present embodiment is to use the light source 54 of double-side can reduce the quantity of light source 54, with the dimensional space of economy system and reduce power consumption, and concentrates the light source 54 that is provided with to help the design of dispelling the heat.
On the other hand, in other embodiments, also can design a light guide plate 56 and have two sides incidence surface 68 simultaneously, a plurality of light sources 54 then can be arranged at the both sides of light guide plate 56, are injected in the light guide plate 56 by different incidence surfaces 68, with further raising brightness.
Please refer to Fig. 5, Fig. 5 is the synoptic diagram of the 3rd embodiment of backlight module of the present invention.Backlight module 100 shown in Figure 5 includes a framework 102 and forms that a side, a reflector plate 108 that an accommodation space 114, at least two light guide plate 106, a plurality of light sources 104 be located at each light guide plate 106 are located at light source 104 and light guide plate 106 belows, a diffuser plate 110 are located on light source 104 and the light guide plate 106 and a mixed light space 112 is located between light source 104, light guide plate 106 and the diffuser plate 110.It should be noted that, the light source 104 of present embodiment is preferably point source of light, be more preferred from top emission type LED, be located on the printed circuit board (PCB), therefore light guide plate 106 is provided with the position a little more than light source 104, and its incidence surface 118 is located at a side bottom surface of light guide plate 106, and is parallel with respect to exiting surface 120, and therefore the light that is sent by light source 104 end faces can directly be entered in the light guide plate 106 by incidence surface 118.Each light guide plate 106 can comprise a reflecting surface 122 in addition, and the light that enters light guide plate 106 is laterally reflexed in whole the light guide plate 106, shown in arrow among the figure.Yet light guide plate 106 can be designed so that also small part light can upwards be penetrated by reflecting surface 122, to adjust the mixed light effect or to improve the blanking bar situation.In the present embodiment, each light guide plate 106 surface can be provided with a plurality of leaded light patterns to adjust light going direction.For example, the leaded light pattern can comprise a plurality of U type grooves or V-groove, maybe can use printing-ink, sandblast mode or site ejection formation to be made in the upper surface or the lower surface of light guide plate 106, so that light guide plate 106 produces bright dipping, also can make the concentrated class linear light source that forms of bright dipping of light guide plate 106 by the design of part printing or local sandblast.Light guide plate 106 interior arrows are represented the light course among Fig. 5, promptly demonstrate main light and all concentrate on the several sections bright dipping of light guide plate 106 and form the class linear light source.
Moreover backlight module 100 can comprise the supporting construction 124 that is same as light guide plate 106 quantity in addition and be located at light guide plate 106 belows, and the reducible height that is slightly larger than light source 104 of the thickness of supporting construction 124 wherein is to make it a little more than light source 104 light guide plate 106 bed hedgehoppings.In addition, in order to improve light utilization, supporting construction 124 is preferably the reflection subassembly with reflection function, in will be made progress by the light that light guide plate 106 bottoms are penetrated reflected back light guide plate 106 or mixed light space 112.
The 4th embodiment of backlight module of the present invention is shown among Fig. 6, and device major part wherein shown in Figure 6 is all continued to use the element numbers of Fig. 5.The present embodiment place different with the 4th embodiment is that the thickness of its light guide plate 106 is thicker than light source 104, to replace the setting of supporting construction 124 among the 3rd embodiment, and light guide plate 106 has a depression 126 and is positioned at one side bottom, and the size of depression 126 is corresponding to the size of light source 104, to be used for ccontaining light source 104.Therefore light source 104 is to be embedded among the light guide plate 106, and to have the four sides at least be depression 126 surfaces that are adjacent to light guide plate 104.In addition, because no matter the light that top or side produced of light source 104 all can be is directly injected among the light guide plate 106 by depression 126 surfaces, so the light source 104 of present embodiment can be top emission type LED or lateral emitting type LED, the incidence surface 118 of light guide plate 106 then can be arranged at arbitrary surface of corresponding depression 126.
In sum, backlight module of the present invention is incidence surface one side that a plurality of point-like light sources as LED is arranged at one or more pieces light guide plate, can reduce light source quantity is set, and can utilize light guide plate surface leaded light design of patterns to adjust the Luminance Distribution of exiting surface, therefore design of the present invention can be transformed into point source of light the class linear light source, and reach the effect of traditional tube light source with the light source of taking into account environmental requirement with low power consumption, the low heating, can directly use the otpical leaf or the diffuser plate of traditional backlight module, to reduce R﹠D costs.On the other hand, the light guide plate of backlight module of the present invention does not directly contact with diffuser plate, and a mixed light space is set between the two, can allow the emitted light of light guide plate exiting surface abundant mixed light in the mixed light space, enter in the diffuser plate to produce uniform light, and then display device even brightness area source is provided.
The above only is preferred embodiment of the present invention, and all equalizations of doing according to claim of the present invention change and modify, and all should belong to covering scope of the present invention.
Claims (18)
1. a backlight module is characterized in that, described backlight module comprises:
At least one light guide plate, it has an exiting surface and at least one incidence surface;
At least one light source is located at a side of described light guide plate, and the light that this light source produced is to be entered in the described light guide plate by described incidence surface;
One diffuser plate is located at described light guide plate top but is not contacted this light guide plate and described light source; And
One mixed light space between described diffuser plate and described light guide plate, described light source, makes that the light that penetrates from described exiting surface can be in this mixed light space fully behind the mixed light, penetrate described backlight module by described diffuser plate again.
2. backlight module as claimed in claim 1, wherein said light source are a point-like light source.
3. backlight module as claimed in claim 1, wherein said light source are a directive property light source.
4. backlight module as claimed in claim 3, wherein said light source is a two-sided illuminating source, and this backlight module comprises two described light guide plate, be located at the both sides of described light source, the light that makes this double-side light source be produced can be injected in this light guide plate by the described incidence surface of each described light guide plate respectively.
5. backlight module as claimed in claim 1, wherein said backlight module comprise a plurality of described light sources, are parallel to the one or both sides of described light guide plate.
6. backlight module as claimed in claim 5, wherein said light source comprises red-light source, green-light source, blue light source or white light source.
7. backlight module as claimed in claim 1, wherein said light guide plate has at least one depression, is used for ccontaining described light source.
8. backlight module as claimed in claim 1, wherein said backlight module comprises a supporting construction in addition, is located at described light guide plate below so that this light guide plate the position is set a little more than described light source.
9. backlight module as claimed in claim 8, wherein said supporting construction are a reflection subassembly.
10. backlight module as claimed in claim 1, the incidence surface of wherein said light guide plate and exiting surface are orthogonal to join.
11. backlight module as claimed in claim 1, the incidence surface of wherein said light guide plate is parallel to each other relative with exiting surface.
12. backlight module as claimed in claim 1, wherein said light guide plate are a strip light guide plate, make the light that is penetrated by described light guide plate form the class linear light source.
13. backlight module as claimed in claim 1, wherein said light guide plate comprise a plurality of leaded light patterns, so that light is advanced to described exiting surface.
14. backlight module as claimed in claim 13, wherein said leaded light pattern local distribution are on described light guide plate, so that the light that is penetrated by described exiting surface forms a plurality of class linear light sources.
15. backlight module as claimed in claim 13, wherein said leaded light pattern are V-groove or U type groove.
16. backlight module as claimed in claim 14, wherein said leaded light pattern is printing-ink pattern, sand blasting pattern or site ejection formation, is used for destroying the total reflection of light and makes the described exiting surface of light directive in each described light guide plate.
17. backlight module as claimed in claim 1, wherein said backlight module comprises a reflector plate in addition, is located at described light source and described light guide plate below.
18. backlight module as claimed in claim 1, wherein said backlight module comprises a framework in addition, this framework has an accommodation space and is used for ccontaining described light source, described light guide plate and described diffuser plate, and this accommodation space of part between this diffuser plate and this light guide plate, this light source forms described mixed light space.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200610171479 CN1996122A (en) | 2006-12-28 | 2006-12-28 | Back light module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200610171479 CN1996122A (en) | 2006-12-28 | 2006-12-28 | Back light module |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1996122A true CN1996122A (en) | 2007-07-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200610171479 Pending CN1996122A (en) | 2006-12-28 | 2006-12-28 | Back light module |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1996122A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102109130A (en) * | 2010-11-01 | 2011-06-29 | 友达光电股份有限公司 | Backlight module |
| WO2015000331A1 (en) * | 2013-07-04 | 2015-01-08 | 京东方科技集团股份有限公司 | Led stand, led, and backlight module |
| CN107991805A (en) * | 2017-11-14 | 2018-05-04 | 青岛海信电器股份有限公司 | A kind of side entrance back module and display device |
| CN108878202A (en) * | 2018-07-23 | 2018-11-23 | 苏州达方电子有限公司 | Backlight module and its manufacturing method |
| US20240027672A1 (en) * | 2021-09-23 | 2024-01-25 | Wuhan China Star Optoelectronics Technology Co., Ltd. | Backlight module and display device |
-
2006
- 2006-12-28 CN CN 200610171479 patent/CN1996122A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102109130A (en) * | 2010-11-01 | 2011-06-29 | 友达光电股份有限公司 | Backlight module |
| WO2015000331A1 (en) * | 2013-07-04 | 2015-01-08 | 京东方科技集团股份有限公司 | Led stand, led, and backlight module |
| US9964287B2 (en) | 2013-07-04 | 2018-05-08 | Boe Technology Group Co., Ltd. | LED support, LED and backlight module |
| CN107991805A (en) * | 2017-11-14 | 2018-05-04 | 青岛海信电器股份有限公司 | A kind of side entrance back module and display device |
| CN108878202A (en) * | 2018-07-23 | 2018-11-23 | 苏州达方电子有限公司 | Backlight module and its manufacturing method |
| US20240027672A1 (en) * | 2021-09-23 | 2024-01-25 | Wuhan China Star Optoelectronics Technology Co., Ltd. | Backlight module and display device |
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