CN103728774B - Mura removing method and LCD product for direct LED backlight - Google Patents
Mura removing method and LCD product for direct LED backlight Download PDFInfo
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- CN103728774B CN103728774B CN201310748194.9A CN201310748194A CN103728774B CN 103728774 B CN103728774 B CN 103728774B CN 201310748194 A CN201310748194 A CN 201310748194A CN 103728774 B CN103728774 B CN 103728774B
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Abstract
The invention discloses a kind of Mura removing method for direct LED backlight and LCD product, utilize LED light source to irradiate diffuser plate；Utilize reflector plate that LED light source shines directly into the disperse light beyond diffuser plate to reflect；Described disperse light forms hot spot on reflector plate, and site set up by the reflector plate in spot area, reduces the reflector plate reflectance in spot area by site.The present invention uses the method that reflector plate reflection characteristic is revised in local, reduce the reflectance of the spot area that LED is formed, strengthen the scattered power in this region, light intensity received by the region of LED is just weakened by diffuser plate, then the light intensity homogenization exported by whole diffuser plate is made, and by revising area and the Density Distribution of dot area on reflector plate, the uniform light degree realizing diffuser plate output maximizes, thus eliminate the Mura problem of liquid crystal panel, improve the display effect of liquid crystal panel.
Description
Technical field
The invention belongs to liquid crystal display product technical field, specifically, relate to a kind of liquid crystal display product using direct-light type LED backlight lighting engineering to design.
Background technology
Present liquid crystal display product, liquid crystal panel is illuminated, to realize the display of picture by main employing direct LED backlight technology or side entering-type LED backlight source technology.At present, direct LED backlight technology mainly uses LED attachment lens (lens) as core component, lens are utilized to expand the dispersion angle of LED light, utilize the air groove formed between LED and diffuser plate, light mixing distance is provided for LED light, and then after making LED light mix homogeneously, arrive diffuser plate again, LED light done further after DIFFUSION TREATMENT by diffuser plate, be evenly radiated on whole liquid crystal panel.
Using the LCD product of this direct LED backlight Technology design, the most and LED the spacing of the LED quantity of use are the least, and the mixed effect of light is the best；Meanwhile, light mixing distance is the biggest, and the mixed effect of light is the best.Therefore, current main employing increases the quantity of LED or increases light mixing distance two ways, improves the mixed effect of light, enables LED light to illuminate equably on liquid crystal panel, improves display effect.
But, when increasing LED quantity, owing to LED and lens are expensive, the significantly rising of complete machine cost therefore can be caused；Use the mode increasing light mixing distance then can cause the increase of product thickness, and then affect the aesthetics of machine product profile.If in order to 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 most likely can cause occurring that the LED Mura(Mura of display brightness inequality refers to that display brightness is uneven at the middle section of diffuser plate, cause the phenomenon of various vestige), there is " lantern " Mura that display brightness is uneven in four edge regions, thus have a strong impact on the display effect of LCD product.
Summary of the invention
The present invention is directed to the LCD product using direct-light type LED backlight lighting engineering to design at present, propose a kind of method for eliminating Mura phenomenon, can be on the premise of reducing LED usage quantity and not increasing light mixing distance (or suitably reducing light mixing distance), it is achieved the homogenization of illuminating ray.
For solving above-mentioned technical problem, the present invention is achieved by the following technical solutions:
A kind of Mura removing method for direct LED backlight, utilizes LED light source to irradiate diffuser plate；Utilize reflector plate that LED light source shines directly into the disperse light beyond diffuser plate to reflect；Described disperse light forms hot spot on reflector plate, and site set up by the reflector plate in spot area, reduces the reflector plate reflectance in spot area by site.
Preferably, it is preferred to use print or spray the mode of ink in the spot area of reflector plate, form described site.
In order to the reflectance of different parts in spot area is regulated further, so that the light intensity after Fan She is more uniform, when setting up site on the reflector plate in described spot area, the layout density of site is gradual change trend, and follow that light intensity is the highest, dot density is the biggest, the rule that light intensity is the most weak, dot density is the least.
Preferably, during regulating described dot density, can use in the unit are of described spot area, lay the site that quantity is identical, by the area of each site in the unit are of the described spot area of regulation, change dot density；Or the site laying area equation in the unit are of described spot area can be used, by the quantity of site in the unit are of the described spot area of regulation, change dot density.
Further, described reflector plate includes bottom reflection sheet and surrounding offside reflection sheet, and described LED light source is positioned at the dead ahead of bottom reflection sheet；Set up described site in the spot area formed centered by every LEDs light source on bottom reflection sheet, and the shape of the dot area formed is consistent with the shape of this spot area and area with area.
Preferably, described dot area is preferably provided with circularizing, and arranges the annular diameters diameter more than LED light source of annular dot area, and outer annular diameter is less than 80mm；Described LED light source is laid on backboard and is positioned at the region of annular dot area internal ring.
Further, on described surrounding offside reflection sheet, the disperse light sent by two the adjacent LED light sources being positioned at position, the edge spot area formed that crosses sets up described site, and the shape of the dot area formed is consistent with the shape of this spot area and 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 is laterally away from direction, described bottom reflection sheet side from the one of adjacent described bottom reflection sheet and is gradually increased.
Preferably, the network point distribution being laid on described surrounding offside reflection sheet position between adjacent two row's LED light sources.
Based on the above-mentioned Mura removing method for direct LED backlight, the invention allows for a kind of LCD product using the described Mura removing method for direct LED backlight to design, including liquid crystal panel and backlight module, described backlight module is provided with backboard, LED light source and reflector plate；LED light source is utilized to irradiate diffuser plate；Utilize reflector plate that LED light source shines directly into the disperse light beyond diffuser plate to reflect；Described disperse light forms hot spot on reflector plate, and site set up by the reflector plate in spot area, reduces the reflector plate reflectance in spot area by site.
Compared with prior art, advantages of the present invention and good effect be: the present invention uses the method that reflector plate reflection characteristic is revised in local, reduce the reflectance of the spot area that LED is formed, strengthen the scattered power in this region, light intensity received by the region of LED is just weakened by diffuser plate, then the light intensity homogenization exported by whole diffuser plate is made, and by revising area and the Density Distribution of dot area on reflector plate, the uniform light degree making diffuser plate export maximizes, thus eliminate the Mura problem of liquid crystal panel, improve the display effect of liquid crystal panel.It is applied to this technology use in the LCD product that direct-light type LED backlight lighting engineering designs, is possible not only to save a number of LED, to realize the obvious reduction of complete machine cost；Moreover, it is also possible to suitably shorten the LED light mixing distance to diffuser plate, to reduce the thickness of backlight module, improve the aesthetics of LCD product machine shape, and then while ensureing Uniform Illumination effect, it is achieved the ultrathin design of LCD product.
After reading in conjunction with the accompanying the detailed description of embodiment of the present invention, the other features and advantages of the invention will become clearer from.
Accompanying drawing explanation
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 reflector space local amendment mode in LCD product proposed by the invention；
Fig. 3 is that in Fig. 2, in low beam reflector space, the partial enlarged drawing of a kind of embodiment of mode is laid in site；
Fig. 4 is that in Fig. 2, in the reflector space of edge, the partial enlarged drawing of a kind of embodiment of mode is laid in site.
Detailed description of the invention
Below in conjunction with the accompanying drawings the detailed description of the invention of the present invention is described in more detail.
The present embodiment is for the LCD product using the design of direct-light type LED backlight lighting engineering, LED quantity used in product is few or LED to diffuser plate light mixing distance in short-term, the problem that backlight light and shade Mura easily occurs, propose a kind of method that can effectively eliminate direct LED backlight Mura phenomenon, by to the amendment carrying out local reflex characteristic in backlight module for reflecting the reflector plate of LED light line, the reflectance of the spot area formed on reflector plate is projected with reduction LED light source, and then the gap of light intensity that the light intensity making spot area reflect reflects with non-spot area reduces or reaches essentially identical, then the light intensity making whole diffuser plate receive is uniform, realize the LED backlight uniform irradiation to liquid crystal panel.
Below in conjunction with Fig. 1 to Fig. 4, the Mura removing method for direct LED backlight being proposed the present embodiment is set forth in.
Shown in Figure 1, LCD product is provided with liquid crystal panel 4 and for illuminating the backlight module of liquid crystal panel 4.The parts such as backboard 5, reflector plate 2, LED light source 1 and diffuser plate 3 it are mainly provided with in described backlight module.Wherein, backboard 5 plays and supports and the effect of protection internal components; generally including bottom surface 5-1 and surrounding side 5-2, and the surrounding side outward-dipping expansion of 5-2 (i.e. forming obtuse angle alpha between inner face and the inner face of bottom surface 5-1 of surrounding side 5-2), end face is used for installing diffuser plate 3 and liquid crystal panel 4.The bottom surface 5-1 of backboard 5 installs LED light source 1, by the light-emitting area of LED light source 1 forward, just to diffuser plate 3 and liquid crystal panel 4, diffuser plate 3 and liquid crystal panel 4 is carried out direct irradiation.The bottom surface 5-1 and surrounding side 5-2 of backboard 5 are respectively mounted reflector plate 2, and the reflector plate 2 being arranged on the 5-1 of bottom surface is positioned at the rear of LED light source 1, for 1 point of disperse light being mapped to rear and surrounding of LED light source is fully reflected, to improve light emission rate.
In order to improve intensity of illumination, the bottom surface 5-1 of backboard 5 needs lay plurality of LEDs light source 1, plurality of LEDs light source 1 is arranged in matrix array form, and is substantially covered with the bottom surface 5-1 of whole backboard 5, as shown in Figure 1 and Figure 2, to provide the light that can be sufficient for liquid crystal panel brightness of illumination demand.
The characteristics of luminescence according to LED light source 1: the center of distance LED light source 1 is the nearest, and the intensity of light is the biggest；The center of distance LED light source 1 is the most remote, and the intensity of light is the most weak.When the negligible amounts of the LED light source 1 laid in backlight module, the spacing between two LEDs light sources 1 will become big.The light launched 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 light projects on the reflector plate 2 of rear and surrounding side, carry out once or after multiple reflections via reflector plate 2, the diffuser plate 3 described in final directive.
Due on reflector plate 2, the light reflected apart from the echo area (i.e. echo area at low beam) that LED light source 1 is nearer is mainly radiated on the diffuser plate 3 directly over LED light source 1, reflection characteristic is the best, and the light that at this, diffuser plate 3 receives is the strongest, picture LED Mura the most easily occurs；The marginal position of diffuser plate 3 mainly it is radiated at by the light of reflector plate 2 edge reflector space reflection, reflection characteristic is the best, the light that at this, diffuser plate 3 receives is the strongest, picture " lantern " Mura the most easily occurs, thus drastically influence the display effect of LCD product.
In order to solve Mura problem, the spot area 7 that LED light source 1 is formed on reflector plate 2 by the present embodiment, the region that the macroscopic brightness of 8(is stronger) reflection characteristic carry out local revise, by reducing spot area 7, the reflectance of 8 internal reflection sheets 2, reduce by spot area 7, gap between 8 and the light intensity of non-spot area reflection, after air groove through being formed between LED light source 1 with diffuser plate 3 mixes, it is evenly radiated on diffuser plate 3, incident light is diffused and after incremental processing by diffusion sheet and prismatic lens in diffuser plate 3 respectively, realize the uniform irradiation to liquid crystal panel 4.
During the reflection characteristic of spot area 7, the 8 internal reflection sheet 2 being formed LED light source 1 processes, the present embodiment preferably employs the mode setting up site 6 on the reflector plate 2 in spot area 7,8, reduce the reflectance of spot area 7,8 internal reflection sheet 2, strengthen scattering.
Referring specifically to shown in Fig. 2-Fig. 4, described site 6 preferably employs ink or other reflectance material less than reflector plate 2, is formed on reflector plate 2 in the way of spraying or printing.The shape of site 6 can be circular, as shown in Figure 3, Figure 4, it is also possible to be square or other arbitrary shapes.In view of in reflector space, the light intensity of diverse location is also not quite similar, in order to improve the homogenization of reflection light further, the present embodiment preferably carries out gradual change adjustment to the distribution density of site in spot area 7,8, and it is the biggest to follow the highest region of light intensity, dot density, the most weak region of light intensity, the rule that dot density is the least, and then in making spot area 7,8, the region that light intensity is the highest, reflectance is the lowest；The region that light intensity is the most weak, reflectance is the highest.Thus one, so that become uniform by the light intensity of reflector plate 2 reflection in spot area 7,8, in addition the reflectance of spot area 7,8 internal reflection sheet 2 is less than the reflectance of the reflector plate 2 of non-spot area, thus so that be evenly radiated on diffuser plate 3 by the light entirety of whole reflector plate 2 reflection, the light realizing diffuser plate 3 output uniformly maximizes, and improves the image display quality of direct LED backlight LCD product.
Here dot density refers specifically to spraying or the accounting of Dot Area in unit are.The area that in unit are, site occupies is the most, and dot density is the biggest；Otherwise, the area that in unit are, site occupies is the fewest, and the density of site is the least.During in spot area 7,8, the distribution density of site 6 carries out gradual change process, two ways can be used: a kind of site being to lay in the unit are in spot area 7,8 equal number, by the area of each site in the unit are in regulation spot area 7,8, change dot density；Another is the site laying area equation in the unit are in spot area 7,8, by the quantity of site in the unit are in regulation spot area 7,8, changes dot density.
Illustrating as a example by circular shaped lattice point 6, see shown in Fig. 3, Fig. 4, be positioned at the position that spot area 7,8 light intensity is the highest, the diameter of the site 6 of equal number is the biggest, or the quantity that the site 6 of same diameter is laid is the most；Otherwise, it being positioned at the position that spot area 7,8 light intensity is the most weak, the diameter of the site 6 of equal number is the least, or the quantity that the site 6 of same diameter is laid is the fewest.
Hot spot owing to being formed on reflector plate 2 is a lot, the present embodiment is preferably i.e. arranged on the reflector plate on backboard 5 bottom surface 5-1 at bottom reflection sheet 2-1() on, described site 6 is set up in the spot area 7 formed centered by every LEDs light source 1, and the shape of the dot area formed is the most consistent with the shape of this spot area 7 and area with area, dot density is gradually reduced laterally by center, as in figure 2 it is shown, i.e. the closer to the site 6 at center, area is the biggest；Further away from the site 6 at center, area is the least, is consequently formed the gradual change arrangement of site 6 size.When LED light source 1 is circular, the spot area 7 that the disperse light sent 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 being preferably provided with described dot area is also annular, and annular diameters should be greater than the diameter of LED light source 1, and outer annular diameter is equal with the outer annular diameter of spot area 7, but should be generally less than 80mm, to avoid weakening the volume reflection of the disperse light beyond spot area 7.
Surrounding offside reflection sheet 2-2(is formed at for disperse light and is i.e. arranged on the reflector plate of backboard 5 side 5-2) on hot spot, preferably set up described site in the disperse light sent by two the adjacent LED light sources 1 being positioned at position, the edge spot area 8 formed that crosses, and shape and the area of the dot area formed is the most consistent with the shape of this spot area 8 and area, to reduce the volume reflection of light in this spot area.
When LED light source 1 is arranged in matrix array mode at backboard 5 bottom surface 5-1, as in figure 2 it is shown, preferably position between adjacent two row's LED light sources on surrounding offside reflection sheet 2-2, spot area 8 is selected to lay 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 forms obtuse angle alpha, and shown in Fig. 1, thus in this spot area 8, the light intensity in outside can be more than the light intensity of inner side.Based on this, when the present embodiment lays site 6 in described spot area 8, its dot density should be adjoined the one of described bottom reflection sheet 2-1 by reflector plate 2-2 and be laterally away from direction, described bottom reflection sheet 2-1 side and be gradually increased, as shown in Figure 4, i.e. in the case of quantity is identical, the closer to the site 6 in bottom reflection sheet 2-1 direction, area is the least；Further away from the site 6 in bottom reflection sheet 2-1 direction, area is the biggest, is consequently formed the gradual change arrangement of site 6 size.
After using the light and shade Mura removing method of the present embodiment in LCD product, achieve the Homogenization Treatments to reflection light, and then the light intensity that makes whole liquid crystal panel receive is uniform, on the premise of ensureing liquid crystal panel uniform irradiation, can suitably reduce the usage quantity of LED light source or shorten the LED light source light mixing distance to diffuser plate, on the basis of significantly reducing LCD product complete machine cost, contribute to realizing the ultrathin design of product, improve the taste of direct-light type LED backlight product.
Certainly; described above is not limitation of the present invention; the present invention is also not limited to the example above, change that those skilled in the art are made in the essential scope of the present invention, retrofits, adds or replaces, and also should belong to protection scope of the present invention.
Claims (9)
1. the Mura removing method for direct LED backlight, it is characterised in that: utilize LED light source to irradiate diffuser plate；Utilize reflector plate that LED light source shines directly into the disperse light beyond diffuser plate to reflect；Described disperse light forms hot spot on reflector plate, and site set up by the reflector plate in spot area, reduces the reflector plate reflectance in spot area by site；Described reflector plate includes bottom reflection sheet and surrounding offside reflection sheet, and described LED light source is positioned at the dead ahead of bottom reflection sheet；Set up described site in the spot area formed centered by every LEDs light source on bottom reflection sheet, and the shape of the dot area formed is consistent with the shape of this spot area and area with area.
Mura removing method for direct LED backlight the most according to claim 1, it is characterised in that: use the mode of printing or spraying ink to form described site in the spot area of reflector plate.
Mura removing method for direct LED backlight the most according to claim 1 and 2, it is characterized in that: when setting up site on the reflector plate in described spot area, the layout density of site is gradual change trend, and follow that light intensity is the highest, dot density is the biggest, the rule that light intensity is the most weak, dot density is the least.
Mura removing method for direct LED backlight the most according to claim 3, it is characterized in that: during regulating described dot density, use in the unit are of described spot area, lay the site that quantity is identical, by the area of each site in the unit are of the described spot area of regulation, change dot density；Or use the site laying area equation in the unit are of described spot area, by the quantity of site in the unit are of the described spot area of regulation, change dot density.
Mura removing method for direct LED backlight the most according to claim 1, it is characterised in that: described dot area is annular, and the annular diameters of annular dot area is less than 80mm more than the diameter of LED light source, outer annular diameter；Described LED light source is laid on backboard and is positioned at the region of annular dot area internal ring.
Mura removing method for direct LED backlight the most according to claim 1, it is characterized in that: on described surrounding offside reflection sheet, the disperse light sent by two the adjacent LED light sources being positioned at position, the edge spot area formed that crosses sets up described site, and the shape of the dot area formed is consistent with the shape of this spot area and area with area.
Mura removing method for direct LED backlight the most according to claim 6, 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 is laterally away from direction, described bottom reflection sheet side from the one of adjacent described bottom reflection sheet and is gradually increased.
Mura removing method for direct LED backlight the most according to claim 6, it is characterised in that: the network point distribution being laid on described surrounding offside reflection sheet position between adjacent two row's LED light sources.
9. a LCD product, including liquid crystal panel and backlight module, is provided with backboard, LED light source and reflector plate in described backlight module；It is characterized in that: use the backlight module as described in the Mura removing method design for direct LED backlight as described in claim any one of claim 1 to 8.
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| CN201310748194.9A CN103728774B (en) | 2013-12-31 | 2013-12-31 | Mura removing method and LCD product for direct LED backlight |
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| CN201310748194.9A CN103728774B (en) | 2013-12-31 | 2013-12-31 | Mura removing method and LCD product for direct LED backlight |
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| CN103728774B true CN103728774B (en) | 2016-08-17 |
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| WO2016068590A1 (en) | 2014-10-31 | 2016-05-06 | Lg Electronics Inc. | Backlight unit and display device including backlight unit |
| CN105867013A (en) * | 2015-01-24 | 2016-08-17 | 鸿富锦精密工业（深圳）有限公司 | A display device and a light source module |
| KR102334862B1 (en) * | 2015-07-21 | 2021-12-03 | 엘지디스플레이 주식회사 | Backlight unit and liquid crystal dispaly device including the same |
| CN105068315B (en) * | 2015-09-01 | 2019-05-31 | 深圳Tcl新技术有限公司 | Blue-ray LED down straight aphototropism mode set and liquid crystal display |
| CN106501994B (en) * | 2015-09-08 | 2021-10-29 | 青岛海信电器股份有限公司 | Quantum dot light-emitting device, backlight module and display device |
| CN106681050A (en) * | 2015-11-06 | 2017-05-17 | 苏州璨宇光学有限公司 | Display device and light source module |
| CN105301841A (en) * | 2015-11-23 | 2016-02-03 | 青岛海信电器股份有限公司 | Backlight module and liquid crystal display equipment |
| CN105700230B (en) * | 2016-01-29 | 2018-11-20 | 京东方科技集团股份有限公司 | Backlight, backlight module and display device |
| CN105700051A (en) * | 2016-01-30 | 2016-06-22 | 贵阳海信电子有限公司 | A reflector plate applied to a large-screen LCM, a backlight module group and the large-screen LCM |
| CN107329321A (en) * | 2017-08-15 | 2017-11-07 | 青岛海信电器股份有限公司 | A kind of down straight aphototropism mode set and display device |
| CN109799645B (en) * | 2019-03-15 | 2022-05-31 | 惠州市华星光电技术有限公司 | Backlight module and display device |
| CN112578560B (en) * | 2020-12-30 | 2022-09-16 | 深圳市康冠科技股份有限公司 | Method, system and related equipment for designing distribution of dots on reflector plate |
| CN113253478A (en) * | 2021-05-20 | 2021-08-13 | 武汉华星光电技术有限公司 | Display device |
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