CN202747156U - Backlight module and liquid crystal display device - Google Patents
Backlight module and liquid crystal display device Download PDFInfo
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- CN202747156U CN202747156U CN201220436116.6U CN201220436116U CN202747156U CN 202747156 U CN202747156 U CN 202747156U CN 201220436116 U CN201220436116 U CN 201220436116U CN 202747156 U CN202747156 U CN 202747156U
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- polarized light
- quarter
- reflection
- backlight module
- lgp
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Abstract
The utility model discloses a backlight module and a liquid crystal display device, relates to the field of liquid crystal display manufacturing, and can improve the utilization rate of light of backlights. The backlight module comprises a reflective polarizing brightening sheet and a reflecting plate, and a quarter-wave plate is arranged between the reflective polarizing brightening sheet and the reflecting plate. The backlight module is mainly applied to the liquid crystal display device.
Description
Technical field
The utility model relates to liquid crystal indicator and makes the field, relates in particular to a kind of backlight module and liquid crystal indicator.
Background technology
At present, liquid crystal indicator comprises liquid crystal panel and backlight module, wherein backlight module provides light source for liquid crystal panel, backlight module comprises LGP, the below of LGP is provided with reflecting plate, be provided with backlight between the both sides of LGP or LGP and the reflecting plate, the top of LGP is disposed with diffusion sheet, prismatic lens and reflection-type polarisation blast sheet.The natural daylight that backlight sends passes through LGP, diffusion sheet, prismatic lens arrives reflection-type polarisation blast sheet, reflection-type polarisation blast sheet propagates the x direction linearly polarized light in the natural daylight to the lower polaroid in the liquid crystal panel, the y direction linearly polarized light that the direction of vibration with x direction linearly polarized light in the natural daylight is vertical is reflected back reflecting plate, because the direction of vibration of y direction linearly polarized light is identical with the direction of the absorption axes of lower polaroid, so x direction linearly polarized light can pass through lower polaroid, the light that reflecting plate reflects reflection-type polarisation blast sheet again reflects to reflection-type polarisation blast sheet, in twice reflection process, y direction linearly polarized light is during by diffusion sheet and prismatic lens, because diffusion sheet and prismatic lens have depolarized property, so that part y direction linearly polarized light is converted into x direction linearly polarized light, thus the light utilization efficiency of raising backlight.
In the process that realizes the utility model embodiment, the inventor finds that there are the following problems at least in the prior art: because the depolarized effect of diffusion sheet, prismatic lens is very little, only have the linearly polarized light of the y direction of few part to be become the natural daylight of the linearly polarized light that comprises x direction linearly polarized light and y direction after depolarized right, thereby cause the light utilization efficiency of backlight not high.
The utility model content
In view of this, embodiment of the present utility model provides a kind of backlight module and liquid crystal indicator, to solve the not high problem of light utilization efficiency of backlight in the prior art.
For achieving the above object, embodiment of the present utility model adopts following technical scheme:
On the one hand, the utility model embodiment provides a kind of backlight module, comprises reflection-type polarisation blast sheet and reflecting plate, is provided with quarter-wave plate between described reflection-type polarisation blast sheet and the reflecting plate.
Concrete, described backlight module also comprises LGP, and described LGP is arranged between described reflecting plate and the described reflection-type polarisation blast sheet, and described quarter-wave plate is arranged between described reflecting plate and the described LGP.
Optionally, described backlight module also comprises LGP and diffusion sheet, and described LGP and described diffusion sheet are arranged between described reflecting plate and the described reflection-type polarisation blast sheet, and described quarter-wave plate is arranged between described LGP and the described diffusion sheet.
Optionally, described backlight module also comprises diffusion sheet and prismatic lens, and described diffusion sheet and prismatic lens are arranged between described reflecting plate and the described reflection-type polarisation blast sheet, and described quarter-wave plate is arranged between described diffusion sheet and the described prismatic lens.
Optionally, described backlight module also comprises prismatic lens, and described prismatic lens is arranged between described reflecting plate and the described reflection-type polarisation blast sheet, and described quarter-wave plate is arranged between described prismatic lens and the described reflection-type polarisation brightness enhancement film.
On the other hand, the utility model also provides a kind of liquid crystal indicator, comprises above-mentioned backlight module.
Further, described liquid crystal indicator also comprises liquid crystal panel, described liquid crystal panel comprises lower polaroid and upper polaroid, angle between the absorption axes direction of the optical axis direction of the quarter-wave plate in the described backlight module and described lower polaroid greater than 0 the degree and less than 180 the degree, and be not equal to 90 the degree.
Preferably, the angle between the absorption axes direction of the optical axis direction of described quarter-wave plate and described lower polaroid is 45 degree or 135 degree.
The backlight module that the utility model embodiment provides and liquid crystal indicator, by between the reflection-type polarisation blast sheet in backlight module and the reflecting plate quarter-wave plate being set, the linearly polarized light of the y direction of part is become after depolarized comprise x direction linearly polarized light by the depolarized effect that utilizes diffusion sheet in the backlight module and prismatic lens with prior art and so compare with the natural daylight of the linearly polarized light of y direction, quarter-wave plate can change y direction linear polarization polarized state of light, twice of the linearly polarized light of y direction is converted into x direction linearly polarized light by more y direction linearly polarized light behind the quarter-wave plate, thereby improves the utilization rate of the light of backlight.
Description of drawings
In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, the below will do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art, apparently, accompanying drawing in the following describes only is embodiment more of the present utility model, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is a kind of backlight modular structure schematic diagram of the utility model embodiment one correspondence;
Fig. 2 is a kind of backlight modular structure schematic diagram of the utility model embodiment two correspondences;
Fig. 3 is a kind of backlight modular structure schematic diagram of the utility model embodiment three correspondences;
Fig. 4 is a kind of backlight modular structure schematic diagram of the utility model embodiment four correspondences.
Reference numeral:
The 10-quarter-wave plate; The 11-reflecting plate; The 12-LGP; The 13-diffusion sheet; The 14-prismatic lens; 15-reflection-type polarisation blast sheet;
1-x direction linearly polarized light; 2-y direction linearly polarized light; The 3-natural daylight; The 4-circularly polarized light; The circularly polarized light that 5-is opposite with circularly polarized light 4 direction of rotation.
The specific embodiment
Below in conjunction with the accompanying drawing among the utility model embodiment, the technical scheme among the utility model embodiment is clearly and completely described, obviously, described embodiment only is the utility model part embodiment, rather than whole embodiment.
The utility model embodiment provides a kind of backlight module, such as Fig. 1-shown in Figure 4, this backlight module comprises: quarter-wave plate 10, reflecting plate 11, LGP 12, diffusion sheet 13, prismatic lens 14 and reflection-type polarisation blast sheet 15 to embodiment four for specific embodiment one.
Wherein, reflecting plate 11 is arranged under the LGP 12, sets gradually diffusion sheet 13, prismatic lens 14 and reflection-type polarisation blast sheet 15 on LGP 12.Be understandable that, in backlight module, also be provided with backlight, backlight generally can be arranged between the periphery or LGP and reflecting plate of LGP, and the natural daylight 3 that comprises x direction linearly polarized light 1 and y direction linearly polarized light 2 is provided.Described quarter-wave plate 10 can be arranged between described reflection-type polarisation blast sheet 15 and the described reflecting plate 11, the concrete facilities of quarter-wave plate 10 between reflection-type polarisation blast sheet 15 and reflecting plate 11 can be such as any situation among Fig. 1-Fig. 4.
Need to prove, be provided with liquid crystal panel on the reflection-type polarisation blast sheet 15 of described backlight module, liquid crystal panel comprises polaroid and lower polaroid, lower polaroid is adjacent with described reflection-type polarisation increment sheet 15, the absorption axes direction of lower polaroid is identical with the direction of vibration of the linearly polarized light of y direction, so that the x direction linear polarization luminous energy by reflection-type polarisation increment sheet enters liquid crystal panel through lower polaroid, y direction linearly polarized light can not see through lower polaroid and enter liquid crystal panel, wherein, the direction of vibration of the linearly polarized light of x direction is mutually vertical with the direction of vibration of y direction linearly polarized light.When the angle between the optical axis direction of quarter-wave plate 10 and the absorption axes of lower polaroid (being the direction of vibration of the linearly polarized light of y direction) greater than 0 degree less than 180 degree and be not equal to 90 when spending, y direction linearly polarized light is converted into elliptically polarized light after by quarter-wave plate 10, when the optical axis direction of quarter-wave plate 10 and the angle between the lower polaroid absorption axes (being the direction of vibration of the linearly polarized light of y direction) are that 45 degree or 135 are when spending, y direction linearly polarized light is converted into circularly polarized light after by quarter-wave plate 10, circularly polarized light is through behind the baffle reflection, again by can all being converted into x direction linearly polarized light behind the quarter-wave plate 10, all by reflection-type polarisation increment sheet and enter liquid crystal panel, but elliptically polarized light through behind the baffle reflection again by being converted into the linearly polarized light of non-x direction and non-y direction behind the quarter-wave plate 10, the linearly polarized light of non-x and non-y direction has part by reflection-type polarisation increment sheet and enters liquid crystal panel, angle between the absorption axes of the optical axis direction of quarter-wave plate 10 and lower polaroid (being the direction of vibration of the linearly polarized light of y direction) is more near 45 degree or 135 degree, non-x direction and non-y direction linearly polarized light are just more in the amount of the x direction linearly polarized light that the x direction provides, can be also just more by reflection-type polarisation increment sheet and the light that enters liquid crystal panel, angle between the absorption axes of the optical axis direction of quarter-wave plate 10 and lower polaroid (being the direction of vibration of the linearly polarized light of y direction) is more near 0 degree, 90 degree or 180 degree, non-x direction and non-y direction linearly polarized light are fewer in the amount of the x direction linearly polarized light that x direction line provides, can be also just fewer by reflection-type polarisation increment sheet and the light that enters liquid crystal panel.Therefore when the absorption axes angle of the optical axis direction of quarter-wave plate 10 and lower polaroid be 45 to spend or 135 when spending, the utilization rate of light is the highest.
Embodiment of the present utility model take the optical axis direction of quarter-wave plate 10 and the angle between the lower polaroid absorption axes (being the direction of vibration of the linearly polarized light of y direction) as 45 degree or 135 degree describe as example.Specific as follows:
The backlight modular structure of embodiment one as shown in Figure 1, quarter-wave plate 10 can be arranged between reflecting plate 11 and the LGP 12.
Concrete, the natural daylight that comprises x direction linearly polarized light 1 and y direction linearly polarized light 23 that backlight sends arrives reflection-type polarisation blast sheets 15 by LGP 12, diffusion sheet 13, prismatic lens 14.Reflection-type polarisation blast sheet 15 is to be circulated up and down by two kinds of different thin-film materials to stack the blast sheet with reflection polarized light property that obtains, a kind of is isotropic thin-film material, another kind is anisotropic thin-film material, refractive index at two kinds of thin-film materials of x direction (being x direction linearly polarized light direction of vibration) is identical, so when x direction linearly polarized light 1 process reflection-type polarisation blast sheet 15, not not reflecting at the interface of two kinds of different thin-film materials, x direction linearly polarized light 1 can directly pass through reflection-type polarisation blast sheet 15, refractive index at two kinds of thin-film materials of y direction (being y direction linearly polarized light direction of vibration) is different, so when y direction linearly polarized light 2 this reflection-type polarisation blast sheet 15 of process, pass through successively prismatic lens 14 in the at the interface generation reflection of bi-material, diffusion sheet 13 rear arrival quarter-wave plates 10.Y direction linearly polarized light 2 becomes circularly polarized light 4 after by quarter-wave plate 10, circularly polarized light 4 becomes the circularly polarized light 5 opposite with circularly polarized light 4 direction of rotation after reflecting through reflecting plate 11, circularly polarized light 5 all changes into x direction linearly polarized light 1 through quarter-wave plate 10 again, and x direction linearly polarized light is successively by passing through smoothly again reflection-type polarisation blast sheet 15 behind LGP 12, diffusion sheet 13, the prismatic lens 14.
Need to prove, in embodiment one, diffusion sheet 13 and prismatic lens 14 can be integrated bloomings, and diffusion sheet 13 can be integrated on the LGP 15 with prismatic lens 14, also can not comprise diffusion sheet 13 and prismatic lens 14.
The backlight modular structure of embodiment two as shown in Figure 2, quarter-wave plate 10 can be arranged between LGP 12 and the diffusion sheet 13.
Concrete, the natural daylight that comprises x direction linearly polarized light 1 and y direction linearly polarized light 23 that backlight sends arrives reflection-type polarisation blast sheets 15 by LGP 12, quarter-wave plate 10, diffusion sheet 13, prismatic lens 14.X direction linearly polarized light 1 can pass through reflection-type polarisation blast sheet 15, y direction linearly polarized light 2 is reflected successively by prismatic lens 14, diffusion sheet 13 rear arrival quarter-wave plates 10, y direction linearly polarized light 2 changes into circularly polarized light 4 after by quarter-wave plate 10, circularly polarized light 4 arrives reflecting plate 11 by LGP 12 and becomes the circularly polarized light 5 opposite with circularly polarized light 4 direction of rotation by reflecting plate 11 reflections, circularly polarized light 5 arrives quarter-wave plate 10 by LGP 12, circularly polarized light 5 is again by the quarter-wave plate 10 rear x direction linearly polarized lights 1 that all are converted into, and x direction linearly polarized light 1 is successively by diffusion sheet 13, prismatic lens 14 is rear smoothly by reflection-type polarisation blast sheet 15.
Need to prove, in embodiment two, diffusion sheet 13 and prismatic lens 14 can be integrated bloomings, and prismatic lens 14 can become one with LGP 12, reflecting plate 11 and LGP 12 can be integrated integrative-structures, also can not comprise prismatic lens 14.
The backlight modular structure of embodiment three as shown in Figure 3, quarter-wave plate 10 can be arranged between diffusion sheet 13 and the prismatic lens 14.
Concrete, the natural daylight that comprises x direction linearly polarized light 1 and y direction linearly polarized light 23 that backlight sends arrives reflection-type polarisation blast sheets 15 by LGP 12, diffusion sheet 13, quarter-wave plate 10, prismatic lens 14.X direction linearly polarized light 1 can pass through reflection-type polarisation blast sheet 15, y direction linearly polarized light 2 is reflected by arriving quarter-wave plate 10 behind the prismatic lens, y direction linearly polarized light 2 changes into circularly polarized light 4 after by quarter-wave plate 10, circularly polarized light 4 is successively by diffusion sheet 13, LGP 12 arrives reflecting plate 11 through reflecting plate 11 reflections, become the circularly polarized light 5 opposite with circularly polarized light 4 direction of rotation, circularly polarized light 5 is successively by LGP 12, diffusion sheet 13 arrives quarter-wave plate 10, circularly polarized light 5 is again by the quarter-wave plate 10 rear x direction linearly polarized lights 1 that all are converted into, and x direction linearly polarized light 1 is rear smoothly by reflection-type polarisation blast sheet 15 by prismatic lens 14.
Need to prove, in embodiment three, diffusion sheet 13 can become one with LGP 12, and perhaps prismatic lens 14 becomes one with LGP 12, and reflecting plate 11 and LGP 12 can be integrated integrative-structures, also can not comprise LGP 12.
The backlight modular structure of embodiment four as shown in Figure 4, quarter-wave plate 10 can be arranged between prismatic lens 14 and the reflection-type polarisation blast sheet 15.
Concrete, the natural daylight that comprises x direction linearly polarized light 1 and y direction linearly polarized light 23 that backlight sends arrives reflection-type polarisation blast sheets 15 by LGP 12, diffusion sheet 13, prismatic lens 14, quarter-wave plate 10.X direction linearly polarized light 1 can pass through reflection-type polarisation blast sheet 15, y direction linearly polarized light 2 is reflected rear arrival quarter-wave plate 10, y direction linearly polarized light 2 changes into circularly polarized light 4 after by quarter-wave plate 10, circularly polarized light 4 is successively by prismatic lens 14, diffusion sheet 13, LGP 12 arrives reflecting plate 11 by reflecting plate 11 reflections, become the circularly polarized light 5 opposite with circularly polarized light 4 direction of rotation, circularly polarized light 5 is successively by LGP 12, diffusion sheet 13, prismatic lens 14 arrives quarter-wave plate 10, circularly polarized light 5 is again by the quarter-wave plate 10 rear x direction linearly polarized lights 1 that all are converted into, and x direction linearly polarized light 1 is smoothly by reflection-type polarisation blast sheet 15.
Need to prove, in embodiment four, diffusion sheet 13 and prismatic lens 14 can be integrated bloomings, prismatic lens 14 can become one with LGP 10, diffusion sheet 13 also can become one with LGP, reflecting plate 11 and LGP 12 can be integrated integrative-structures, also can not comprise LGP 12 and diffusion sheet 13.
The utility model embodiment also provides a kind of liquid crystal indicator that comprises above-described embodiment one to four described backlight module.
The backlight module that the utility model embodiment provides and liquid crystal indicator, by between the reflection-type polarisation blast sheet in backlight module and the reflecting plate quarter-wave plate being set, that the linearly polarized light of the y direction of part is become after depolarized and comprises x direction linearly polarized light and so compare with the natural daylight of the linearly polarized light of y direction with prior art by the depolarized effect that utilizes diffusion sheet in the backlight module and prismatic lens, twice of y direction linearly polarized light be by all being converted into x direction linearly polarized light behind the quarter-wave plate, thereby improve the utilization rate of the light of backlight.
The backlight module that the utility model embodiment provides can be applied in the liquid crystal indicator.
The above; it only is the specific embodiment of the present utility model; but protection domain of the present utility model is not limited to this; anyly be familiar with those skilled in the art in the technical scope that the utility model discloses; can expect easily changing or replacing, all should be encompassed within the protection domain of the present utility model.Therefore, protection domain of the present utility model should be as the criterion with the protection domain of described claim.
Claims (8)
1. a backlight module comprises reflection-type polarisation blast sheet and reflecting plate, it is characterized in that, is provided with quarter-wave plate between described reflection-type polarisation blast sheet and the reflecting plate.
2. backlight module according to claim 1 is characterized in that, also comprises LGP, and described LGP is arranged between described reflecting plate and the described reflection-type polarisation blast sheet, and described quarter-wave plate is arranged between described reflecting plate and the described LGP.
3. backlight module according to claim 1, it is characterized in that, also comprise LGP and diffusion sheet, described LGP and described diffusion sheet are arranged between described reflecting plate and the described reflection-type polarisation blast sheet, and described quarter-wave plate is arranged between described LGP and the described diffusion sheet.
4. backlight module according to claim 1, it is characterized in that, also comprise diffusion sheet and prismatic lens, described diffusion sheet and prismatic lens are arranged between described reflecting plate and the described reflection-type polarisation blast sheet, and described quarter-wave plate is arranged between described diffusion sheet and the described prismatic lens.
5. backlight module according to claim 1, it is characterized in that, also comprise prismatic lens, described prismatic lens is arranged between described reflecting plate and the described reflection-type polarisation blast sheet, and described quarter-wave plate is arranged between described prismatic lens and the described reflection-type polarisation brightness enhancement film.
6. a liquid crystal indicator is characterized in that, comprises each described backlight module of claim 1-5.
7. liquid crystal indicator according to claim 6, also comprise liquid crystal panel, described liquid crystal panel comprises lower polaroid and upper polaroid, it is characterized in that, angle between the absorption axes direction of the optical axis direction of the quarter-wave plate in the described backlight module and described lower polaroid greater than 0 the degree and less than 180 the degree, and be not equal to 90 the degree.
8. liquid crystal indicator according to claim 7 is characterized in that, the angle between the absorption axes direction of the optical axis direction of described quarter-wave plate and described lower polaroid is 45 degree or 135 degree.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201220436116.6U CN202747156U (en) | 2012-08-29 | 2012-08-29 | Backlight module and liquid crystal display device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201220436116.6U CN202747156U (en) | 2012-08-29 | 2012-08-29 | Backlight module and liquid crystal display device |
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| CN202747156U true CN202747156U (en) | 2013-02-20 |
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| CN201220436116.6U Expired - Lifetime CN202747156U (en) | 2012-08-29 | 2012-08-29 | Backlight module and liquid crystal display device |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103411160A (en) * | 2013-07-26 | 2013-11-27 | 京东方科技集团股份有限公司 | Backlight module and display device |
| CN103698939A (en) * | 2013-12-20 | 2014-04-02 | 京东方科技集团股份有限公司 | Backlight module and transparent display device |
| WO2016008142A1 (en) * | 2014-07-15 | 2016-01-21 | 深圳市华星光电技术有限公司 | Circular polarizer, liquid crystal display panel and liquid crystal display device |
| CN106094341A (en) * | 2016-08-19 | 2016-11-09 | 京东方科技集团股份有限公司 | A kind of backlight module and display device |
| CN109212817A (en) * | 2018-07-25 | 2019-01-15 | 友达光电股份有限公司 | wide viewing angle display device |
| CN109491144A (en) * | 2018-12-24 | 2019-03-19 | 武汉华星光电技术有限公司 | Liquid crystal display device |
| CN111679485A (en) * | 2020-06-10 | 2020-09-18 | Tcl华星光电技术有限公司 | Reflective display device and manufacturing method thereof |
| CN114280842A (en) * | 2021-12-21 | 2022-04-05 | Tcl华星光电技术有限公司 | Backlight module, display device and electronic equipment |
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2012
- 2012-08-29 CN CN201220436116.6U patent/CN202747156U/en not_active Expired - Lifetime
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103411160B (en) * | 2013-07-26 | 2016-01-20 | 京东方科技集团股份有限公司 | Backlight module and display unit |
| US9618684B2 (en) | 2013-07-26 | 2017-04-11 | Boe Technology Group Co., Ltd. | Backlight module and display device |
| CN103411160A (en) * | 2013-07-26 | 2013-11-27 | 京东方科技集团股份有限公司 | Backlight module and display device |
| CN103698939A (en) * | 2013-12-20 | 2014-04-02 | 京东方科技集团股份有限公司 | Backlight module and transparent display device |
| WO2016008142A1 (en) * | 2014-07-15 | 2016-01-21 | 深圳市华星光电技术有限公司 | Circular polarizer, liquid crystal display panel and liquid crystal display device |
| CN106094341B (en) * | 2016-08-19 | 2019-05-10 | 京东方科技集团股份有限公司 | A kind of backlight module and display device |
| CN106094341A (en) * | 2016-08-19 | 2016-11-09 | 京东方科技集团股份有限公司 | A kind of backlight module and display device |
| CN109212817A (en) * | 2018-07-25 | 2019-01-15 | 友达光电股份有限公司 | wide viewing angle display device |
| US11099423B2 (en) | 2018-07-25 | 2021-08-24 | Au Optronics Corporation | Wide viewing angle display device |
| CN109491144A (en) * | 2018-12-24 | 2019-03-19 | 武汉华星光电技术有限公司 | Liquid crystal display device |
| WO2020133806A1 (en) * | 2018-12-24 | 2020-07-02 | 武汉华星光电技术有限公司 | Liquid crystal display apparatus |
| CN111679485A (en) * | 2020-06-10 | 2020-09-18 | Tcl华星光电技术有限公司 | Reflective display device and manufacturing method thereof |
| CN114280842A (en) * | 2021-12-21 | 2022-04-05 | Tcl华星光电技术有限公司 | Backlight module, display device and electronic equipment |
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