CN203643721U - Direct type LED backlight module capable of eliminating Mura and liquid crystal product - Google Patents
Direct type LED backlight module capable of eliminating Mura and liquid crystal product Download PDFInfo
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- CN203643721U CN203643721U CN201320887004.7U CN201320887004U CN203643721U CN 203643721 U CN203643721 U CN 203643721U CN 201320887004 U CN201320887004 U CN 201320887004U CN 203643721 U CN203643721 U CN 203643721U
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- 230000000694 effects Effects 0.000 abstract description 11
- 238000002310 reflectometry Methods 0.000 abstract description 11
- 238000009792 diffusion process Methods 0.000 abstract description 7
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Abstract
The utility model discloses a direct type LED backlight module capable of eliminating Mura and a liquid crystal product. The direct type LED backlight module comprises a back plate, an LED light source, a diffusion plate and a reflector plate, wherein the reflector plate is used for reflecting scattered light directly irradiated out of the diffusion plate by the LED light source. The area, where the scattered light forms light spots, on the reflector plate is additionally provided with lattice points. According to the direct type LED backlight module, the method for locally modifying the reflection characteristics of the reflector plate is used for lowering the reflectivity of a light spot area formed by an LED and enhancing the diffusivity of the area, so that the strength of light received by the area, directly facing the LED, of the diffusion plate is weakened, and therefore the strength of light output by the whole diffusion plate is homogenized. The area and the density distribution of the lattice point area on the reflector plate are modified, so that the uniformity coefficient of the light output by the diffusion plate is maximized, therefore, the Mura problem of the liquid crystal panel is eliminated, and the display effect 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, likely can cause occurring that at the middle section of diffuser plate the LED Mura(Mura of display brightness inequality refers to that display brightness is inhomogeneous, cause the phenomenon of various vestiges), there is display brightness inequality " lantern " Mura in four edge regions, thereby has a strong impact on the display effect of LCD product.
Summary of the invention
The purpose of this utility model is to provide the direct-light type LED backlight module of a kind of Mura of elimination, can, reducing LED usage quantity and not increasing under the prerequisite of light mixing distance (or suitably reducing light mixing distance), realize the homogenising of illuminating ray.
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 of Mura, 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; Wherein, on described reflector plate, have additional site for the region of described disperse light formation hot spot.
Preferably, described site preferably adopts the mode of printing or spraying ink to be formed in the spot area of reflector plate., described site is the ink dot that ink forms.
Do to regulate further for the reflectivity to different parts in spot area, so that the light intensity after reflection is more even, in the spot area of described reflector plate, the layout density of described site is gradual change trend, and the strong region of light intensity, and dot density is large.
Preferably realize means as two kinds that change zones of different dot density, described dot density adopts lays the site that quantity is identical in the unit area of described spot area, regulates by the area that regulates each site in the unit area of described spot area; Or adopt and in the unit area of described spot area, lay the site that area is equal, regulate by the quantity that regulates site in the unit area of described spot area.
Further, described reflector plate comprises bottom reflection sheet and surrounding offside reflection sheet, and described LED light source is positioned at the dead ahead of bottom reflection sheet; In the spot area being formed, set up described site on bottom reflection sheet, and the shape of the dot area forming is consistent with shape and the area of this spot area with area centered by every LEDs light source.
Preferably, described dot area is preferably arranged to annular, and the interior ring diameter that annular dot area is set is greater than the diameter of LED light source, and outer ring diameter is less than 80mm; Described LED light source is laid on backboard and is positioned at the region that annular dot area is encircled.
Further again, on described surrounding offside reflection sheet, be positioned at disperse light that two adjacent LED light sources of position, edge the send spot area forming that crosses and have additional described site, and the shape of the dot area forming is consistent with shape and the area of this spot area with area.
Further, described surrounding offside reflection sheet tilts to lay, and the reflecting surface of its reflecting surface and bottom reflection sheet forms obtuse angle, the dot density being formed on surrounding offside reflection sheet increases away from described bottom reflection sheet one side direction gradually from the side direction in abutting connection with described bottom reflection sheet.
Preferably, be laid in network point distribution on the described surrounding offside reflection sheet positions between adjacent two row's LED light sources.
Based on the above-mentioned direct-light type LED backlight module of eliminating Mura, 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 Mura, 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; Wherein, on described reflector plate, have additional site for the region of described disperse light formation hot spot.
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 reflectivity of the spot area that LED forms, strengthen the scattered power in this region, diffuser plate is just weakened the received light intensity in the region of LED, then make the light intensity homogenising of exporting by whole diffuser plate, and by area and the Density Distribution of dot area on amendment reflector plate, the light degree of uniformity of diffuser plate output is maximized, thereby eliminate the Mura 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 Uniform Illumination 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 partial enlarged drawing that in Fig. 2, a kind of embodiment of mode is laid in the interior site of low beam reflector space;
Fig. 4 is the partial enlarged drawing that in Fig. 2, a kind of embodiment of mode is laid in reflector space interior site in edge.
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 backlight light and shade Mura, a kind of technology that can effectively eliminate direct LED backlight Mura 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 make the gap of the light intensity of spot area reflection and the light intensity of non-spot area reflection reduce or reach basic identical, then the light intensity that makes whole diffuser plate 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 eliminated Mura 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 the effect of supporting and protecting internal components; generally include bottom surface 5-1 and surrounding side 5-2, and the outward-dipping expansion of surrounding side 5-2 (being to form obtuse angle alpha between the inner face of surrounding side 5-2 and the inner face of bottom surface 5-1), 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 light source 1: 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.
Due on reflector plate 2, the light that the nearer echo area (being echo area, low beam place) of distance L ED light source 1 is reflected is mainly radiated on the diffuser plate 3 directly over LED light source 1, reflection characteristic is better, and the light that this place's diffuser plate 3 receives is stronger, more easily occurs picture LED Mura; Mainly be radiated at the marginal position of diffuser plate 3 by the light of reflector plate 2 edge reflector space reflections, reflection characteristic is better, the light that this place's diffuser plate 3 receives is stronger, more easily occurs picture " lantern " Mura, thereby is having a strong impact on the display effect of LCD product.
In order to solve Mura problem, the spot area 7 that the present embodiment forms on reflector plate 2 LED light source 1, the region that the macroscopic brightness of 8(is stronger) reflection characteristic carry out part amendment, by reducing spot area 7, the reflectivity of 8 internal reflection sheets 2, reduce by spot area 7, 8 and the light intensity of non-spot area reflection between gap, 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.
In the process of processing in the reflection characteristic of spot area 7, the 8 internal reflection sheets 2 that LED light source 1 is formed, the present embodiment preferably adopts the mode of setting up site 6 on the reflector plate 2 in spot area 7,8, reduce the reflectivity of spot area 7,8 internal reflection sheets 2, strengthen scattering.
Specifically, referring to shown in Fig. 2-Fig. 4, described site 6 preferably adopts ink or other reflectivity lower than the material of reflector plate 2, is formed on reflector plate 2 in the mode spraying or print.The shape of site 6 can be circular, as shown in Figure 3, Figure 4, can be also square or other arbitrary shapes.Consider in reflector space, the light intensity of diverse location is also not quite similar, in order further to improve the homogenising of reflection ray, the present embodiment preferably carries out gradual change adjustment to the distribution density of spot area 7,8 interior sites, and it is larger to follow region, dot density that light intensity is higher, the less rule of region, dot density that light intensity is more weak, and then make in spot area 7,8, the region that light intensity is higher, reflectivity is lower; The region that light intensity is more weak, reflectivity is higher.Thus one, can make the light intensity reflecting by the reflector plate 2 in spot area 7,8 become even, in addition the reflectivity of spot area 7,8 internal reflection sheets 2 is lower than the reflectivity of the reflector plate 2 of non-spot area, thereby can make the light entirety reflecting by whole reflector plate 2 be irradiated to equably on diffuser plate 3, realize the light that diffuser plate 3 exports and evenly maximize, improve the picture disply quality of direct LED backlight LCD product.
The dot density here specifically refers to the accounting of the interior spraying of unit area or Dot Area.The area that in unit area, site occupies is more, and dot density is larger; Otherwise the area that in unit area, site occupies is fewer, the density of site is less.The distribution density of spot area 7,8 interior sites 6 is carried out in the process of gradual change processing, can adopt in two ways: a kind of is the site of laying equal number in unit area in spot area 7,8, by regulating the area of each site in the unit area in spot area 7,8, change dot density; Another is to lay the site that area is equal in the unit area in spot area 7,8, by regulating the quantity of site in the unit area in spot area 7,8, changes dot density.
Describe as an example of circular shaped lattice point 6 example, shown in Fig. 3, Fig. 4, be positioned at spot area 7, the 8 higher positions of light intensity, the diameter of the site 6 of equal number is larger, or the quantity that lay the site 6 of same diameter is more; Otherwise, being positioned at spot area 7, the 8 more weak positions of light intensity, the diameter of the site 6 of equal number is less, or the quantity that lay the site 6 of same diameter is fewer.
Because the hot spot forming on reflector plate 2 is a lot, the present embodiment is preferably arranged on the reflector plate on backboard 5 bottom surface 5-1 at bottom reflection sheet 2-1() on, in the spot area 7 being formed, set up described site 6 centered by every LEDs light source 1, and the shape of the dot area forming is preferably consistent with shape and the area of this spot area 7 with area, dot density is reduced laterally gradually by center, as shown in Figure 2,, the closer to the site 6 at center, area is larger; More deep site 6, area is less, and the gradual change that forms thus site 6 sizes is arranged.In the time that LED light source 1 is circle, the spot area 7 that the disperse light of sending by LED light source 1 is formed centered by LED light source 1 at bottom reflection sheet 2 is annular, as shown in Figure 3.Now, the shape that described dot area is preferably set is also annular, and interior ring diameter should be greater than the diameter of LED light source 1, the outer shroud equal diameters of outer ring diameter and spot area 7, but conventionally should be less than 80mm, to avoid weakening the volume reflection of the disperse light beyond spot area 7.
Be formed on surrounding offside reflection sheet 2-2(and be arranged on the reflector plate of backboard 5 side 5-2 for disperse light) on hot spot, preferably set up described site in the cross spot area 8 that forms of the disperse light of being sent by two adjacent LED light sources 1 that are positioned at position, edge, and the shape of the dot area forming is preferably consistent with shape and the area of this spot area 8 with area, to reduce the volume reflection of light in this spot area.
When LED light source 1 is in the time that backboard 5 bottom surface 5-1 arrange in matrix array mode, as shown in Figure 2, the preferably position between adjacent two row's LED light sources on surrounding offside reflection sheet 2-2, selective light spot region 8 is laid described site 6.Owing to being positioned at the outward-dipping laying of reflector plate 2-2 of surrounding side, and the reflecting surface of its reflecting surface and bottom reflection sheet 2-1 formation obtuse angle alpha, shown in Fig. 1, thereby in this spot area 8, the light intensity in outside can be greater than the light intensity of inner side.Based on this, the present embodiment is in the time of the interior laying of described spot area 8 site 6, its dot density should be increased away from described bottom reflection sheet 2-1 mono-side direction in abutting connection with a side direction of described bottom reflection sheet 2-1 gradually by reflector plate 2-2, as shown in Figure 4, in the situation that quantity is identical, the closer to the site 6 of bottom reflection sheet 2-1 direction, area is less; More, away from the site 6 of bottom reflection sheet 2-1 direction, area is larger, and the gradual change that forms thus site 6 sizes is arranged.
In LCD product, adopt after the light and shade Mura 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, contribute 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 of Mura, 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: on described reflector plate, have additional site for the region of described disperse light formation hot spot.
2. the direct-light type LED backlight module of eliminating Mura according to claim 1, is characterized in that: described site adopts the mode of printing or spraying ink to be formed in the spot area of reflector plate.
3. the direct-light type LED backlight module of eliminating Mura according to claim 1 and 2, is characterized in that: in the spot area of described reflector plate, the layout density of described site is gradual change trend, and the strong region of light intensity, and dot density is large.
4. the direct-light type LED backlight module of eliminating Mura according to claim 3, it is characterized in that: described dot density adopts lays the site that quantity is identical in the unit area of described spot area, regulate by the area that regulates each site in the unit area of described spot area; Or adopt and in the unit area of described spot area, lay the site that area is equal, regulate by the quantity that regulates site in the unit area of described spot area.
5. the direct-light type LED backlight module of eliminating Mura according to claim 3, is characterized in that: described reflector plate comprises bottom reflection sheet and surrounding offside reflection sheet, and described LED light source is positioned at the dead ahead of bottom reflection sheet; In the spot area being formed, set up described site on bottom reflection sheet, and the shape of the dot area forming is consistent with shape and the area of this spot area with area centered by every LEDs light source.
6. the direct-light type LED backlight module of eliminating Mura according to claim 5, is characterized in that: described dot area is annular, and the interior ring diameter of annular dot area is greater than the diameter of LED light source, and outer ring diameter is less than 80mm; Described LED light source is laid on backboard and is positioned at the region of annular dot area ring.
7. the direct-light type LED backlight module of eliminating Mura according to claim 5, it is characterized in that: on described surrounding offside reflection sheet, be positioned at disperse light that two adjacent LED light sources of position, edge the send spot area forming that crosses and have additional described site, and the shape of the dot area forming is consistent with shape and the area of this spot area with area.
8. the direct-light type LED backlight module of eliminating Mura according to claim 7, it is characterized in that: described surrounding offside reflection sheet tilts to lay, and the reflecting surface of its reflecting surface and bottom reflection sheet forms obtuse angle, the dot density being formed on surrounding offside reflection sheet increases away from described bottom reflection sheet one side direction gradually from the side direction in abutting connection with described bottom reflection sheet.
9. the direct-light type LED backlight module of eliminating Mura according to claim 7, is characterized in that: be laid in network point distribution on the described surrounding offside reflection sheet positions between adjacent two row's 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 eliminated Mura as described in any one claim in claim 1 to 9.
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