CN203658711U - Direct type LED backlight module group capable of eliminating lamp shadow and liquid crystal product - Google Patents
Direct type LED backlight module group capable of eliminating lamp shadow and liquid crystal product Download PDFInfo
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- CN203658711U CN203658711U CN201320886807.0U CN201320886807U CN203658711U CN 203658711 U CN203658711 U CN 203658711U CN 201320886807 U CN201320886807 U CN 201320886807U CN 203658711 U CN203658711 U CN 203658711U
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- 238000002310 reflectometry Methods 0.000 claims description 33
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- 230000011514 reflex Effects 0.000 description 6
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- 239000007921 spray Substances 0.000 description 3
- 238000009792 diffusion process Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 230000003313 weakening effect Effects 0.000 description 2
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Abstract
The utility model discloses a direct type LED backlight module group capable of eliminating lamp shadow and a liquid crystal product. The direct type LED backlight module group includes a backboard, an LED light source, a diffuser plate, and a reflection sheet performing reflection processing on diffused light, irradiating out of the diffuser plate, of the LED light source, and on the reflection sheet, the reflection rate of the area for diffused light irradiated by the LED light source to form light spots is less than that of other areas. The reflection brightness of the light spot area formed by an LED is reduced by a method of locally modifying the reflective characteristics of the reflection sheet, so that the intensity of light received by a whole liquid crystal panel is uniformized, the lamp shadow problem of the liquid crystal panel is eliminated, and the display effect of the liquid crystal panel is improved. Through the adoption of the direct type LED backlight technology into the liquid crystal product, a certain amount of LEDs can be saved or the light mixing distance from the LED to the diffuser plate can be properly shortened, so that the cost of the whole machine is reduced, and the appearance beauty of the whole machine is improved.
Description
Technical field
The utility model belongs to liquid crystal display product technical field, specifically, relates to a kind of liquid crystal display product that adopts the design of direct-light type LED backlight lighting engineering.
Background technology
Present liquid crystal display product, mainly adopts direct LED backlight technology or side entering-type LED backlight source technology to throw light on to liquid crystal panel, to realize the demonstration of picture.At present, direct LED backlight technology mainly adopts LED to mount lens (lens) as core component, utilize lens to expand the dispersion angle of LED light, utilize the air groove forming between LED and diffuser plate, for LED light provides light mixing distance, and then arrive again diffuser plate after LED light is mixed, and by diffuser plate, LED light is done further after DIFFUSION TREATMENT, be irradiated to equably on whole liquid crystal panel.
Adopt the LCD product of this direct LED backlight technical design, the LED quantity spacing more and LED of use are less, and the mixed effect of light is just better; Meanwhile, light mixing distance is larger, and the mixed effect of light is also better.Therefore, current main employing increases the quantity of LED or increases two kinds of modes of light mixing distance, improves the mixed effect of light, and LED light can be thrown light on liquid crystal panel equably, improves display effect.
But, in the time increasing LED quantity, due to LED and lens costliness, therefore can cause the significantly rising of complete machine cost; Adopt the mode that increases light mixing distance can cause the increase of product thickness, and then affect the aesthetics of machine product profile.If reduce complete machine cost or realize the ultrathin design of machine product, and reduce the usage quantity of LED or shorten light mixing distance, the light that likely can cause being irradiated to liquid crystal panel is inhomogeneous, thereby occurs lamp shadow phenomenon, has a strong impact on the display effect of LCD product.
Summary of the invention
The purpose of this utility model is to provide a kind of direct-light type LED backlight module of eliminating lamp shadow problem, can reduce LED usage quantity and not increase under the prerequisite of light mixing distance (or suitably reducing light mixing distance), realizes the uniform irradiation to liquid crystal panel.
For solving the problems of the technologies described above, the utility model is achieved by the following technical solutions:
Eliminate a direct-light type LED backlight module for lamp shadow, comprise that backboard, LED light source, diffuser plate and the disperse light that LED light source is shone directly into beyond diffuser plate reflect the reflector plate of processing; The reflectivity in the region of the disperse light formation hot spot of wherein, launching for LED light source on described reflector plate is lower than the reflectivity in other regions.
As the wherein a kind of design that spot area is reduced to reflectivity processing, the material of the reflector plate in described spot area is different from the material of the reflector plate in other regions, by selecting the low reflective medium of reflectivity to be laid in spot area, to reduce the reflectivity of spot area.
Further, the described reflector plate of two kinds of materials is stitched together, is laid on backboard and is covered with the whole inner face of backboard, form full wafer echo area, with spread reflection area.
Be annular situation for spot area, preferably the reflector plate in described spot area be designed to annular, the interior ring diameter of annular reflection sheet should be greater than the diameter of LED light source, and outer ring diameter is preferably less than 80mm; And described LED light source is laid in and on backboard, is positioned at the region that annular reflection sheet encircles.
Preferably, the reflector plate in described spot area preferably adopts sub-finish matter.
As another design that spot area is reduced to reflectivity processing, the position that is positioned at spot area on described reflector plate has additional ink layer, reduces the reflectivity of spot area internal reflection sheet by ink layer.
Preferably, described ink layer can adopt on reflector plate the mode of printing or spraying ink to form; Described reflector plate and LED light source are laid on backboard, and described reflector plate is preferably covered with whole backboard inner face, and only, in the installed position perforate of LED light source, the installation for LED light source on backboard is fixed.
Be annular situation for spot area, preferably described ink layer be designed to annular, and the interior ring diameter of annular ink layer should be slightly larger than the diameter of LED, outer ring diameter is preferably less than 80mm; Described LED is laid in and on backboard, is positioned at the region that ink layer encircles.
As the third design that spot area is reduced to reflectivity processing, the position that is positioned at spot area on described reflector plate offers breach, reduce the area of spot area internal reflection sheet by offering breach, and then reach the purpose of design that reduces spot area reflectivity.
Preferably, described breach is preferably designed to striped breach, and described striped breach preferably arranges many, and by the described parallel laying of many stripe breach.
In order to reduce the impact on backlight center brightness, for the plurality of LEDs light source being laid on backboard, the reflectivity of the spot area internal reflection sheet that the reflectivity of the reflector plate of the spot area that the LED light source that preferred setting is positioned at position, central area forms forms higher than other LED light sources, to ensure the center brightness of liquid crystal panel.
Based on the above-mentioned direct-light type LED backlight module of eliminating lamp shadow, the utility model has also proposed a kind of LCD product that adopts the described direct-light type LED backlight module design that can eliminate lamp shadow, comprise liquid crystal panel and backlight module, in described backlight module, be provided with backboard, LED light source, diffuser plate and LED light source is shone directly into diffuser plate disperse light in addition and reflect the reflector plate of processing; The reflectivity in the region of the disperse light formation hot spot of wherein, launching for LED light source on described reflector plate is lower than the reflectivity in other regions.
Compared with prior art, advantage of the present utility model and good effect are: the utility model adopts the method for local amendment reflector plate reflection characteristic, reduce the reflecting brightness of the spot area that LED forms, liquid crystal panel is just weakened the received light intensity in the region of LED, then the light intensity homogenising that makes whole liquid crystal panel receive, eliminate the lamp shadow problem of liquid crystal panel, improve the display effect of liquid crystal panel.This technology is applied in the LCD product that adopts the design of direct-light type LED backlight lighting engineering, not only can saves the LED of some, to realize the obvious reduction of complete machine cost; And, can also suitably shorten the light mixing distance of LED to diffuser plate, to reduce the thickness of backlight module, improve the aesthetics of LCD product machine shape, and then in ensureing illuminating effect, realize the ultrathin design of LCD product.
Read by reference to the accompanying drawings after the detailed description of the utility model embodiment, other features of the present utility model and advantage will become clearer.
Brief description of the drawings
Fig. 1 is the package assembly schematic diagram of backlight module and liquid crystal panel in LCD product;
Fig. 2 is the structural representation of a kind of embodiment of the local alter mode of reflector space in the backlight module that proposes of the utility model;
Fig. 3 is the structural representation of another embodiment of the local alter mode of reflector space in the backlight module that proposes of the utility model;
Fig. 4 is the partial enlarged drawing of reflection characteristic modifier area in Fig. 3.
Embodiment
Below in conjunction with accompanying drawing, embodiment of the present utility model is described in more detail.
The present embodiment is for the LCD product that adopts the design of direct-light type LED backlight lighting engineering, when the LED quantity using in product is few or LED to the light mixing distance of diffuser plate in short-term, easily there is the problem of liquid crystal panel uneven illumination even (being lamp shadow phenomenon), a kind of technology that can effectively eliminate direct LED backlight lamp shadow phenomenon has been proposed, by to carrying out the amendment of local reflex characteristic for the reflector plate that reflects LED light in backlight module, to reduce the reflectivity of the spot area that LED light source projects on reflector plate to be formed, and then the gap of the light intensity of spot area reflection and the light intensity of non-spot area reflection is reduced, then the light intensity that makes whole liquid crystal panel receive is even, realize the uniform irradiation of LED-backlit source to liquid crystal panel.
Below in conjunction with Fig. 1 to Fig. 4, concrete assembling structure and the principle of work thereof of the direct-light type LED backlight module of the lamp shadow eliminated that the present embodiment is proposed are at length set forth.
Shown in Figure 1, in LCD product, be provided with liquid crystal panel 4 and for illuminating the backlight module of liquid crystal panel 4.In described backlight module, be mainly provided with the parts such as backboard 5, reflector plate 2, LED light source 1 and diffuser plate 3.Wherein, backboard 5 plays and supports and the effect of protection internal components, generally include bottom surface 5-1 and surrounding side 5-2, and surrounding side 5-2 extends out, and end face is used for installing diffuser plate 3 and liquid crystal panel 4.On the 5-1 of the bottom surface of backboard 5, LED light source 1 is installed,, just to diffuser plate 3 and liquid crystal panel 4, diffuser plate 3 and liquid crystal panel 4 is carried out to direct irradiation by the light-emitting area of LED light source 1 forward.On the bottom surface of backboard 5 5-1 and surrounding side 5-2, reflector plate 2 is installed respectively, and is arranged on reflector plate 2 on the 5-1 of bottom surface and is positioned at the rear of LED light source 1, for 1 point of disperse light that is mapped to rear and surrounding of LED light source is fully reflected, to improve light emission rate.
In order to improve illumination intensity, on the 5-1 of the bottom surface of backboard 5, need to lay plurality of LEDs light source 1, plurality of LEDs light source 1 is arranged in to matrix array form, and be substantially covered with the bottom surface 5-1 of whole backboard 5, as shown in Figure 1 and Figure 2, so that the light that can be enough to meet liquid crystal panel brightness of illumination demand to be provided.
The characteristics of luminescence according to LED: the center of distance L ED light source 1 is nearer, the intensity of light is larger; The center of distance L ED light source 1 is far away, and the intensity of light is more weak.In the time of the negligible amounts of the LED light source 1 of laying in backlight module, the spacing between two LEDs light sources 1 will become large.The light of launching by LED light source 1, owing to there is the problem of lighting angle, a part of light shines directly on diffuser plate 3, and a part of ray cast is to the reflector plate 2 of rear and surrounding side, carry out once or after multiple reflections the diffuser plate 3 described in final directive via reflector plate 2.
In practical work process, project the light at rear by LED light source 1, can on the reflector plate 2 being arranged on backboard 5 bottom surface 5-1, form hot spot (region that macroscopic brightness is stronger), reflector space 6 as shown in Figure 2.Because the light intensity in spot area 6 is high, the light intensity that therefore reflexes to diffuser plate 3 is also high, causes the brightness in this region high; And project light outside spot area 6 due to weak strength, thereby after reflector plate 2 reflection, the intensity that projects diffuser plate 3 also a little less than, on liquid crystal panel 4, form thus bright dark inhomogeneous " lantern " phenomenon, be lamp shadow problem, having a strong impact on the display effect of LCD product.
In order to solve lamp shadow problem, the present embodiment is processed the reflector plate 2 that is positioned at LED light source 1 rear, adopt the mode of amendment reflector plate 2 local reflex characteristics to reduce the reflectivity in spot area 6, to reduce by the gap between spot area 6 and the light intensity of non-spot area reflection, after the air groove forming between LED light source 1 and diffuser plate 3 mixes, be irradiated to equably on diffuser plate 3, through the diffusion sheet in diffuser plate 3 and prismatic lens respectively the light of incident is spread and incremental processing after, realize the uniform irradiation to liquid crystal panel 4.
Reduce in the process of reflectivity processing in the spot area 6 that LED light source 1 is formed, the present embodiment proposes following three kinds of design proposals, below three kinds of design proposals is specifically described respectively.
Scheme one, shown in Figure 2, in order to reduce the reflectivity of spot area 6 interior reflective mediums, this programme adopts the mode of local replacing reflective medium, originally the reflector plate 2 being laid on backboard 5 is carried out to part amendment, use reflectivity to be laid in described spot area 6, to reduce the reflection characteristic of spot area 6 lower than the reflective medium of former reflector plate 2.
Specifically, can select the sub-finish matter of air spots cunning as described reflective medium, be laid in described spot area 6; Or select any surface finish but reflectivity lower than the light material of reflector plate 2 as described reflective medium, be laid in described spot area 6, still lay original reflector plate 2 and spot area 6 is outer.Because the reflectivity of the reflective medium in spot area 6 is lower than the light reflectance of the reflector plate 2 outside spot area 6, even if thereby it is large to be irradiated to light intensity in spot area 6, but the light intensity that reflexes to expansion board 3 by reflective medium can't be too high, by dwindling the gap that reflexes to the light intensity of diffuser plate 3 by reflective medium and reflector plate 2, thereby weaken bright dark contrast, realize the even mixing of reflection ray, and then avoid forming the lamp shadow phenomenon of light and shade inequality on liquid crystal panel 4.
As a kind of decision design mode of this programme, for shape and the area of described reflective medium, the shape that is preferably designed to the hot spot forming with LED light source 1 is identical with area or basic identical.For example: for circular LED light source 1, its hot spot being formed on backboard 5 bottom surface 5-1 reflector plates 2 is roughly annular, as shown in Figure 2.Now, when reflective medium, preferably reflective medium is also designed to annular in design, and the interior ring d diameter of annular reflective medium should be slightly larger than the diameter d o of LED, shown in Fig. 4, so that the laying of LED light source 1 on backboard 5; The outer ring diameter D of reflective medium is preferably suitable with the outer ring diameter of hot spot, but conventionally should be less than 80mm, to avoid weakening the volume reflection of the disperse light beyond spot area 6.Be formed on the hot spot being positioned on backboard 5 side 5-2 reflector plates 2 for disperse light, can be according to shape and the size of the true form of hot spot and the definite reflective medium that will change of size, to reduce the volume reflection of light in spot area.
For fear of backlight center brightness is produced to excessive impact, carry out the process of its spot area 6-1 reflection characteristic amendment at the LED light source 1-1 to being arranged in position, central area, preferably the reflection characteristic of this spot area 6-1 internal reflection medium is not made to excessive change, select reflectivity lower than reflector plate 2 but higher than the material of other reflective mediums, be laid in and be positioned at the spot area 6-1 that disperse light that the LED light source 1-1 of position, central area sends forms; The spot area 6 that the disperse light of sending for the LED light source 1 of non-central regional location forms, can select the material that reflectivity is lower to be laid in wherein, further to reduce volume reflection.
Scheme two, still in conjunction with shown in Fig. 2, this programme adopts the mode that increases ink layer on former reflector plate 2, revises the reflection characteristic in reflector plate 2 spot area 6, to reduce the volume reflection of spot area 6 interior light.
Specifically, the interior spraying of spot area 6 or printing-ink that can on reflector plate 2, each LED light source 1 forms, form the shape of shape and area and spot area 6 and area is identical or substantially suitable ink layer, reduced the reflectivity of these region 6 reflector plates 2 by ink layer.
As a kind of decision design mode of this programme, preferably reflector plate 2 is covered with to the inner face of whole backboard 5, comprise bottom surface 5-1 and surrounding side 5-2, only the position perforate of LED light source 1 need to be installed, so that the installation of LED light source 1 on backboard 5 fixed.In the time that LED light source 1 is circle, its hot spot being formed on backboard 5 bottom surface 5-1 reflector plates 2 is roughly annular, as shown in Figure 2.Now, can on reflector plate 2, print or spray annular ink layer, and the interior ring d diameter of annular ink layer should be slightly larger than the diameter d o of LED, shown in Fig. 4, so that the laying of LED light source 1 on backboard 5; The outer ring diameter D of ink layer is preferably suitable with the outer ring diameter of hot spot, but conventionally should be less than 80mm, to avoid weakening the volume reflection of the disperse light beyond spot area 6.Be formed on the hot spot on the reflector plate 2 that is positioned at backboard 5 side 5-2 for disperse light, can be according to shape and the size of the true form of hot spot and the definite ink layer that will spray or print of size, to reduce the volume reflection of light in spot area.
Same, in the time that the LED light source 1-1 to being positioned at position, central area carries out the amendment of its spot area 6-1 reflection characteristic, the thickness that sprays or be printed on the ink layer in this spot area 6-1 should be less than the thickness of the ink layer of other spot area 6 interior formation, thereby make the reflectivity of the spot area 6-1 that is positioned at center higher than the reflectivity of other position spot area 6, to avoid that backlight center brightness is produced to excessive impact.
Scheme three, shown in Figure 3, this programme is in order to reduce the reflection characteristic of spot area 6, adopt the mode of offering breach 7 on reflector plate 2 in the spot area 6 forming at every LEDs light source 1, reduce the area of this regional reflex sheet 2, and then reach the purpose of design that reduces spot area 6 reflectivity.
Specifically, can, according to the concrete adjustment demand of reflectivity, offer one or more breach 7 in each spot area 6, described breach 7 is preferably advisable with bar v notch v, shown in Fig. 3, Fig. 4.In the time that needs are offered multiple v notch vs 7, preferably by the described parallel laying of multiple v notch vs 7, to improve manufacturability and aesthetics.
Same, in order to reduce the impact on backlight center brightness, carry out the process of its spot area 6-1 reflection characteristic amendment at the LED light source 1-1 to being arranged in position, central area, the number that is opened in the striped breach 7 in this spot area 6-1 should be less than and is opened in the number of other spot area 6 intra-striate breach or region that each striped breach 7 surrounds is less than spot area 6-1, be positioned at the reflectivity of the spot area 6 of non-central location so that be positioned at the reflectivity of the spot area 6-1 of center higher than other, and then ensure the center brightness of liquid crystal panel 4.
In LCD product, adopt after the lamp shadow removing method of the present embodiment, realize the homogenising processing to reflection ray, and then the light intensity that whole liquid crystal panel is received is even, under ensureing the prerequisite of liquid crystal panel uniform irradiation, can suitably reduce the usage quantity of LED light source or shorten the light mixing distance of LED light source to diffuser plate, significantly reducing on the basis of LCD product complete machine cost, contributing to realize the ultrathin design of product, the taste that improves direct-light type LED backlight product.
Certainly; above-mentioned explanation is not to restriction of the present utility model; the utility model is also not limited in above-mentioned giving an example, and variation, remodeling, interpolation or replacement that those skilled in the art make in essential scope of the present utility model, also should belong to protection domain of the present utility model.
Claims (10)
1. can eliminate a direct-light type LED backlight module for lamp shadow, comprise that backboard, LED light source, diffuser plate and the disperse light that LED light source is shone directly into beyond diffuser plate reflect the reflector plate of processing; It is characterized in that: the reflectivity in the region of the disperse light formation hot spot of launching for LED light source on described reflector plate is lower than the reflectivity in other regions.
2. the direct-light type LED backlight module of eliminating lamp shadow according to claim 1, is characterized in that: the material of the reflector plate in described spot area is different from the material of the reflector plate in other regions.
3. the direct-light type LED backlight module of eliminating lamp shadow according to claim 2, is characterized in that: the described reflector plate of two kinds of materials is stitched together, and is laid on backboard and is covered with the whole inner face of backboard, forms full wafer echo area.
4. the direct-light type LED backlight module of eliminating lamp shadow according to claim 2, is characterized in that: the reflector plate in described spot area is annular, and the interior ring diameter of annular reflection sheet is greater than the diameter of LED light source, and outer ring diameter is less than 80mm; Described LED light source is laid in the region that is positioned at annular reflection sheet ring on backboard.
5. the direct-light type LED backlight module of eliminating lamp shadow according to claim 1, is characterized in that: the position that is positioned at spot area on described reflector plate has additional ink layer.
6. the direct-light type LED backlight module of eliminating lamp shadow according to claim 5, is characterized in that: described reflector plate and LED light source are laid on backboard, and described reflector plate is covered with whole backboard inner face, only in the installed position perforate of LED light source.
7. the direct-light type LED backlight module of eliminating lamp shadow according to claim 1, is characterized in that: the position that is positioned at spot area on described reflector plate offers breach.
8. the direct-light type LED backlight module of eliminating lamp shadow according to claim 7, is characterized in that: described breach is striped breach, described striped breach is provided with many, the parallel laying of many stripe breach.
9. according to the direct-light type LED backlight module of the lamp shadow eliminated described in any one in claim 1 to 8, it is characterized in that: described LED light source is provided with many, be positioned at the reflectivity of the spot area internal reflection sheet that the reflectivity of the reflector plate of the spot area that the LED light source of position, central area forms forms higher than other LED light sources.
10. a LCD product, is characterized in that: the direct-light type LED backlight module that comprises liquid crystal panel and the lamp shadow eliminated as described in any one claim in claim 1 to 9.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201320886807.0U CN203658711U (en) | 2013-12-31 | 2013-12-31 | Direct type LED backlight module group capable of eliminating lamp shadow and liquid crystal product |
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| CN201320886807.0U CN203658711U (en) | 2013-12-31 | 2013-12-31 | Direct type LED backlight module group capable of eliminating lamp shadow and liquid crystal product |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103728775A (en) * | 2013-12-31 | 2014-04-16 | 青岛歌尔声学科技有限公司 | Lampshade elimination method for direct type LED backlight source and liquid crystal product |
| WO2016050067A1 (en) * | 2014-09-30 | 2016-04-07 | 京东方科技集团股份有限公司 | Reflection sheet, backlight module and display device |
| CN105892149A (en) * | 2016-06-07 | 2016-08-24 | 京东方科技集团股份有限公司 | Light-emitting assembly, backlight module and display device |
| CN106019702A (en) * | 2016-06-06 | 2016-10-12 | 广州创维平面显示科技有限公司 | Direct type backlight module and direct type displayer |
| CN113039389A (en) * | 2018-11-15 | 2021-06-25 | Zkw集团有限责任公司 | Vehicle lamp |
-
2013
- 2013-12-31 CN CN201320886807.0U patent/CN203658711U/en not_active Expired - Lifetime
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103728775A (en) * | 2013-12-31 | 2014-04-16 | 青岛歌尔声学科技有限公司 | Lampshade elimination method for direct type LED backlight source and liquid crystal product |
| CN103728775B (en) * | 2013-12-31 | 2016-06-08 | 青岛歌尔声学科技有限公司 | For lamp shadow removing method and the LCD product of direct LED backlight |
| WO2016050067A1 (en) * | 2014-09-30 | 2016-04-07 | 京东方科技集团股份有限公司 | Reflection sheet, backlight module and display device |
| US9709849B2 (en) | 2014-09-30 | 2017-07-18 | Boe Technology Group Co., Ltd. | Reflective sheet with movable vane structure |
| CN106019702A (en) * | 2016-06-06 | 2016-10-12 | 广州创维平面显示科技有限公司 | Direct type backlight module and direct type displayer |
| CN105892149A (en) * | 2016-06-07 | 2016-08-24 | 京东方科技集团股份有限公司 | Light-emitting assembly, backlight module and display device |
| US10330978B2 (en) | 2016-06-07 | 2019-06-25 | Boe Technology Group Co., Ltd. | Light emission assembly of backlight module, backlight module and display device |
| CN113039389A (en) * | 2018-11-15 | 2021-06-25 | Zkw集团有限责任公司 | Vehicle lamp |
| CN113039389B (en) * | 2018-11-15 | 2023-10-24 | Zkw集团有限责任公司 | Vehicle lamp |
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