CN1601353A - Backlight modular of Two-D display - Google Patents
Backlight modular of Two-D display Download PDFInfo
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- CN1601353A CN1601353A CN 03159710 CN03159710A CN1601353A CN 1601353 A CN1601353 A CN 1601353A CN 03159710 CN03159710 CN 03159710 CN 03159710 A CN03159710 A CN 03159710A CN 1601353 A CN1601353 A CN 1601353A
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- light
- backlight module
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- guide plate
- panel screens
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Abstract
The invention is characterized by that a light diffusion element is placed between light incident surface of light-conducting plate and light source, so that it can make the designer use smaller number of light sources to still can reduce firefly phenomenon. Said invented light diffusion element can be obtained by desingning light incident surface of light-conducting plate, it not only can obtain the above-mentioned goal, but also can not increase the cost for making plane display, and can make the light ray provided by backlight module be more uniform, and can make the plane display obtain high-quality image.
Description
Technical field
The present invention relates to a kind of backlight module of flat-panel screens, particularly relate to and a kind ofly between light source and light guide plate, set up light diffusion element, with the backlight module of the flat-panel screens of the firefly phenomenon that solves flat-panel screens.
Background technology
LCD (liquid crystal display, LCD) be a kind of flat-panel screens that is widely used most at present, have features such as low consumption electric power, slim light weight and low voltage drive, its displaying principle is to utilize the material behavior of liquid crystal molecule, the ordered state of liquid crystal molecule is changed, cause liquid crystal material to produce various photoelectric effect.But it is not luminous that the shortcoming of existing LCD is a liquid crystal material itself, so LCD often needs the light source module that provides extra, make when external environment does not have light still can video picture on screen.
(light emitting diode LED), is a kind of low power consumption and light emitting element with high brightness has light stability to light emitting diode, and therefore the advantage of long service life etc. also is particularly suitable for using the light source that becomes LCD.Shown in Figure 1A, it has shown existing with the structure of light emitting diode 31 as the light source of liquid crystal display backlight module 3.After light was penetrated by light emitting diode 31, (light guide plate after LGP) 30 plane of light incidence 300 is injected, dispersed to beam projecting face 301 via reflector plate (reflector sheet) 32 more uniformly via light guide plate.Wherein, the material of light guide plate 30 is generally acryl (polymethylmethacrylate PMMA) or optical plastic (Plastic Division is commonly called as PC material or plastic rubber material), includes 50～80% titania (TiO therein
2) diffusion grain 303, its role is to when the light penetration of being launched from light emitting diode 31 and during towards beam projecting face 301 ejaculations of light guide plate 30, run into titania (TiO
2) diffusion grain 303 can be by scattering more equably.Reflector plate 32 places the below of light guide plate 30, and in order to light is partly reflected back towards beam projecting face 301 directions of light guide plate 30, to improve the brightness of backlight module 3, above-mentioned opticpath 310 as shown in FIG..
In addition, first diffusion sheet (diffuser sheet), 34, one rhombus lens (prism sheet), 35 and 1 second diffusion sheet 36 is arranged above the light guide plate 30 in regular turn, can allow the homogeneity of the light that the beam projecting face 301 of light guide plate 30 sent further improve.Light is imported in the display panels 2 more at last, wherein the number of light emitting diode 31 can differently because of the demand of the illumination (Illumination) of LCD change to some extent, and the number of diffusion sheet and prismatic lens also can be different because of the demand of backlight module 3.
Yet, the still old shortcoming of such light source.Please refer to Figure 1B, this figure is the top view of existing backlight module 3, because the deviser can be based on the consideration of cost, the light source of display panels 2 is used as at plane of light incidence 300 places that arrange several light emitting diodes 31 to be evenly distributed in light guide plate 30, but will then be that the deviser need take in as the light source of display panels 2 with the quantity of what light emitting diodes 31.If the deviser arranges too many light emitting diode 31 can directly increase the cost of making, if but arrangement light emitting diode 31 very little, be to arrange 3 light emitting diodes 31 among the embodiment shown in Figure 1B, then the light owing to light emitting diode 31 is not sufficiently spread at directions X, cause the insufficient light between per two light emitting diodes 31, generation is just like the shadow shown in Figure 1B 302, be commonly called as " firefly phenomenon ", so influenced user's visual experience, how can use less light emitting diode 31 and can obtain the most uniform display quality has become the important problem of LCD deviser.
Summary of the invention
In above-mentioned background of invention, the visual angle of the led light source of available liquid crystal display pannel is less, so that causes tangible firefly phenomenon, the invention provides a kind of backlight module of flat-panel screens, can improve above-mentioned problem.
The object of the present invention is to provide a kind of backlight module of flat-panel screens, by between light guide plate and light emitting diode, inserting a light diffusion element, in the time of can reaching with the lesser amt light emitting diode as the light source of backlight module, still can reduce the firefly phenomenon.
Another object of the present invention is to provide a kind of backlight module of flat-panel screens, to design be a light diffusion element by the plane of light incidence of light guide plate being done one, in the time of not only can reaching with the lesser amt light emitting diode as the light source of backlight module, still can reduce the firefly phenomenon; Can not increase simultaneously the cost of making flat-panel screens.
According to above-described purpose, the invention provides a kind of backlight module of flat-panel screens, comprising: a light guide plate, have a plane of light incidence and a beam projecting face, wherein the beam projecting face is corresponding to a display panel; One light source is positioned at the plane of light incidence place, wherein has a light diffusion element between light source and the beam projecting face.
According to above-mentioned conception, wherein light guide plate also comprises a reflector plate, is positioned at the opposing face of beam projecting face, is to penetrate after light is reflexed to the beam projecting face.
According to above-mentioned conception, wherein light guide plate also comprises 50～80% diffusion particle; Wherein diffusion particle is by titania (TiO
2) form.
According to above-mentioned conception, wherein light source is a pointolite.
According to above-mentioned conception, wherein pointolite is made up of light emitting diode (LED).
According to above-mentioned conception, wherein the width of light diffusion element is slightly larger than the width of light source approximately.
According to above-mentioned conception, wherein the width of light diffusion element equates with the width of plane of light incidence.
According to above-mentioned conception, wherein light diffusion element is made up of diffusion sheet.
According to above-mentioned conception, wherein light diffusion element is this plane of light incidence side of this light guide plate to be made a plurality of shrinkage pools form.
According to above-mentioned conception, wherein the shape of shrinkage pool is to be selected from following group: semicircle sphere, circle, circular arc, the parabolic bodily form, polyhedron shape.
According to above-mentioned conception, wherein light diffusion element is this plane of light incidence side of this light guide plate to be made many grooves form.
According to above-mentioned conception, wherein many grooves are parallel to each other.
According to above-mentioned conception, also comprise the backlight module of flat-panel screens, also comprise: one first diffusion sheet is positioned at this light guide plate top; One rhombus lens is positioned at this first diffusion sheet top; And one second diffusion sheet, be positioned at this rhombus lens top.
Description of drawings
Figure 1A is a kind of side-looking diagrammatic cross-section of existing flat-panel screens;
Figure 1B is a kind of backlight module of existing flat-panel screens, looks synoptic diagram on the backlight module;
Fig. 2 A be first embodiment of the invention flat-panel screens backlight module on look synoptic diagram;
Fig. 2 B is the front elevational schematic of light guide plate of the backlight module of first embodiment of the invention;
Fig. 2 C be second embodiment of the invention flat-panel screens backlight module on look synoptic diagram;
Fig. 3 A be third embodiment of the invention flat-panel screens backlight module on look synoptic diagram;
Fig. 3 B is the front elevational schematic of light guide plate of the backlight module of third embodiment of the invention;
Fig. 3 C is in the third embodiment of the invention, and light diffusion element is the diagrammatic cross-section of the spherical shrinkage pool of semicircle;
Fig. 4 A be fourth embodiment of the invention flat-panel screens backlight module on look synoptic diagram;
Fig. 4 B is the front elevational schematic of light guide plate of the backlight module of fourth embodiment of the invention.
Embodiment
Some embodiments of the present invention can be described in detail as follows.Yet except describing in detail, the present invention can also be widely implements at other embodiment, and scope of the present invention do not limited, its with after claim be as the criterion.
The first embodiment of the present invention please also refer to Fig. 2 A and Fig. 2 B, wherein Fig. 2 A be first embodiment of the invention flat-panel screens backlight module on look synoptic diagram; And Fig. 2 B is the front elevational schematic of light guide plate of the backlight module of first embodiment of the invention; In order to solve the firefly phenomenon shown in existing Figure 1B, present embodiment increases by a light diffusion element between the plane of light incidence 400 of the emission side of each light emitting diode 41 and light guide plate 401, in the present embodiment, light diffusion element is a diffusion sheet 43, wherein, the quantity of diffusion sheet 43 just equals the quantity of light emitting diode 41, and the width of each diffusion sheet 43 is slightly larger than the width of light emitting diode 41 approximately, and the light that light emitting diode 41 is sent all can get final product by diffusion sheet 43.Owing to enter light guide plate 40 by the plane of light incidence 400 of light guide plate 40 again after the light diffusion that this diffusion sheet 43 can be sent light emitting diode 41, make the light angle that enters light guide plate 40 comparatively spread, seem average after the light obfuscation, and make original firefly phenomenon comparatively not obvious, even solve fully.
The second embodiment of the present invention is please directly with reference to Fig. 2 C, the enforcement principle of present embodiment is identical with first embodiment, but the width of the diffusion sheet 44 among the embodiment equates so on manufacturing course, the advantage of easy contraposition is arranged with the width of the plane of light incidence 400 of light guide plate 401; The preferably, if the width of diffusion sheet 44 can make light that all light emitting diodes 41 are sent by, do not need the width of the plane of light incidence 400 of certain and light guide plate 40 to equate.
The third embodiment of the present invention please be simultaneously with reference to Fig. 3 A and Fig. 3 B, present embodiment increases by a light diffusion element 53 in the emission side of each light emitting diode 51 and 500 of the planes of light incidence of light guide plate 50, this light diffusion element 53 is to form increasing a plurality of shrinkage pools 530 on the surface of plane of light incidence 500 sides of light guide plate 50, each shrinkage pool 530 is to be depressed within the plane of light incidence 500, its shrinkage pool be shaped as the semicircle sphere; The light that light emitting diode 51 is sent is through a plurality of shrinkage pool 530 of light diffusion element 53 time, light can produce the phenomenon of diffusion because of the shape of shrinkage pool 530, shown in Fig. 3 C, make the light angle that enters light guide plate 50 comparatively spread, seem average after the light obfuscation, and make original firefly phenomenon comparatively not obvious, even solve fully; Wherein, the shape of shrinkage pool 530 also can be designed to circle, circular arc, the parabolic bodily form or polyhedron shape, also can produce similar effect.
The fourth embodiment of the present invention please be simultaneously with reference to Fig. 4 A and Fig. 4 B, present embodiment increases by a light diffusion element 63 in the emission side of each light emitting diode 61 and 600 of the planes of light incidence of light guide plate 60 equally, this light diffusion element 63 is plane of light incidence 600 sides of light guide plate 60 to be increased many grooves 630 form, and every groove 630 can be designed to be parallel to each other; The light that is sent when light emitting diode 61 is through many grooves 630 of light diffusion element 63 time, light can produce the phenomenon of diffusion because of groove 630 equally, make the light angle that enters light guide plate 60 comparatively spread, seem average after the light obfuscation, and make original firefly phenomenon comparatively not obvious, even solve fully.
The technical characterictic of the invention described above, can make the light that light source produced of light emitting diode, before entering light guide plate, just pass through a light diffusion element earlier, make light in advance by obfuscation, when light enters display panel via the light guide plate ejaculation, can as existing, not produce the firefly phenomenon, and make light more even, make that the image that flat-panel screens produced is more even.
Though the specific embodiment of before enumerating and narrating, apparently, other does not break away under the disclosed spirit, and the equivalence of being finished changes or modifies, and all should be included in the claim of the present invention.In addition, all other do not break away under the disclosed spirit, and other that finished are similar and approximate to be changed or modification, also includes in claim of the present invention.Should explain scope of the present invention with the widest definition simultaneously, comprise all modifications and similar structures thus.
Claims (10)
1. the backlight module of a flat-panel screens comprises:
One light guide plate has a plane of light incidence, and a beam projecting face, and wherein this beam projecting face is corresponding to a display panel;
One light source is positioned at this plane of light incidence place, wherein has a light diffusion element between this light source and this beam projecting face.
2. the backlight module of flat-panel screens as claimed in claim 1, wherein this light guide plate also comprises a reflector plate, is positioned at the opposing face of this beam projecting face, is to penetrate after light being reflexed to this beam projecting face.
3. the backlight module of flat-panel screens as claimed in claim 1 wherein also comprises 50～80% diffusion particle in this light guide plate, and wherein this diffusion particle is by titania (TiO
2) form.
4. the backlight module of flat-panel screens as claimed in claim 1, wherein this light source is a pointolite, wherein this pointolite can be made up of light emitting diode (LED).
5. the backlight module of flat-panel screens as claimed in claim 1, wherein the width of this light diffusion element is slightly larger than the width of this light source approximately.
6. the backlight module of flat-panel screens as claimed in claim 1, wherein the width of this light diffusion element equates with the width of this plane of light incidence.
7. the backlight module of flat-panel screens as claimed in claim 1, wherein this light diffusion element is made up of diffusion sheet.
8. the backlight module of flat-panel screens as claimed in claim 1, wherein this light diffusion element is this plane of light incidence side of this light guide plate to be made a plurality of shrinkage pools form, and wherein the shape of this shrinkage pool is to be selected from following group: semicircle sphere, circle, circular arc, the parabolic bodily form, polyhedron shape.
9. the backlight module of flat-panel screens as claimed in claim 1, wherein this light diffusion element is this plane of light incidence side of this light guide plate to be made many grooves form, wherein these many grooves are parallel to each other.
10. the backlight module of flat-panel screens as claimed in claim 1 also comprises:
One first diffusion sheet is positioned at this light guide plate top;
One rhombus lens is positioned at this first diffusion sheet top; And
One second diffusion sheet is positioned at this rhombus lens top.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03159710 CN1601353A (en) | 2003-09-23 | 2003-09-23 | Backlight modular of Two-D display |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03159710 CN1601353A (en) | 2003-09-23 | 2003-09-23 | Backlight modular of Two-D display |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1601353A true CN1601353A (en) | 2005-03-30 |
Family
ID=34660745
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 03159710 Pending CN1601353A (en) | 2003-09-23 | 2003-09-23 | Backlight modular of Two-D display |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7938568B2 (en) | 2007-08-03 | 2011-05-10 | Beijing Boe Optoelectronics Technology Co., Ltd. | LED backlight device |
| US8033709B2 (en) | 2006-03-15 | 2011-10-11 | Au Optronics Corp. | Light guide plate, and backlight module and liquid crystal display incorporating same |
| WO2013033940A1 (en) * | 2011-09-09 | 2013-03-14 | 深圳市华星光电技术有限公司 | Backlight module and liquid crystal display |
| CN103244864A (en) * | 2012-02-13 | 2013-08-14 | 鑫成科技(成都)有限公司 | Backlight module |
| CN103376495A (en) * | 2012-04-18 | 2013-10-30 | 昆山康佳电子有限公司 | Light guide plate and backlight module |
| US8614775B2 (en) | 2011-09-09 | 2013-12-24 | Shenzhen China Star Optoelectronics Technology Co., Ltd. | Backlight module and liquid crystal display |
| CN108205170A (en) * | 2018-02-01 | 2018-06-26 | 广东欧珀移动通信有限公司 | Backlight module, display device and electronic equipment |
| CN109799635A (en) * | 2019-01-16 | 2019-05-24 | 柳州阜民科技有限公司 | A kind of electronic equipment |
| CN112289205A (en) * | 2019-07-12 | 2021-01-29 | 华为技术有限公司 | Dazzle various display subassembly and electronic equipment |
-
2003
- 2003-09-23 CN CN 03159710 patent/CN1601353A/en active Pending
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8033709B2 (en) | 2006-03-15 | 2011-10-11 | Au Optronics Corp. | Light guide plate, and backlight module and liquid crystal display incorporating same |
| US7938568B2 (en) | 2007-08-03 | 2011-05-10 | Beijing Boe Optoelectronics Technology Co., Ltd. | LED backlight device |
| WO2013033940A1 (en) * | 2011-09-09 | 2013-03-14 | 深圳市华星光电技术有限公司 | Backlight module and liquid crystal display |
| US8614775B2 (en) | 2011-09-09 | 2013-12-24 | Shenzhen China Star Optoelectronics Technology Co., Ltd. | Backlight module and liquid crystal display |
| CN103244864A (en) * | 2012-02-13 | 2013-08-14 | 鑫成科技(成都)有限公司 | Backlight module |
| CN103376495A (en) * | 2012-04-18 | 2013-10-30 | 昆山康佳电子有限公司 | Light guide plate and backlight module |
| CN108205170A (en) * | 2018-02-01 | 2018-06-26 | 广东欧珀移动通信有限公司 | Backlight module, display device and electronic equipment |
| CN108205170B (en) * | 2018-02-01 | 2023-10-20 | Oppo广东移动通信有限公司 | Backlight module, display device and electronic equipment |
| CN109799635A (en) * | 2019-01-16 | 2019-05-24 | 柳州阜民科技有限公司 | A kind of electronic equipment |
| CN112289205A (en) * | 2019-07-12 | 2021-01-29 | 华为技术有限公司 | Dazzle various display subassembly and electronic equipment |
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