CN114280843A - Backlight module and display module - Google Patents
Backlight module and display module Download PDFInfo
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- CN114280843A CN114280843A CN202111590127.XA CN202111590127A CN114280843A CN 114280843 A CN114280843 A CN 114280843A CN 202111590127 A CN202111590127 A CN 202111590127A CN 114280843 A CN114280843 A CN 114280843A
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Abstract
The application discloses backlight unit and display module assembly, backlight unit includes: a backlight source; the light guide plate comprises a side light incoming surface, a light outgoing surface, a bottom reflecting surface and a side reflecting surface, wherein the side light incoming surface is arranged corresponding to the backlight source; the side reflecting surface is provided with an ink layer, the ink layer comprises a white ink layer and a black ink layer, and the black ink layer is arranged on one side, away from the side reflecting surface, of the white ink layer. The white ink layer can enable light rays from the light guide plate to be reflected back to the light guide plate at the side reflecting surface, and the utilization rate of the light rays by the light guide plate is improved; the black ink layer 132 can absorb light, reduce light leakage from the edge of the light guide plate, and improve the problem of poor optics of edge bright lines, so as to achieve good visual effect and product quality.
Description
Technical Field
The application relates to the technical field of display, in particular to a backlight module and a display module comprising the backlight module.
Background
In the current stage, the development trend of large-size liquid crystal display screens is still the requirements of narrow frames, lightness and thinness, high brightness, low power consumption and the like, aiming at the trend of narrow frames, the traditional liquid crystal display mainly takes a side-in type backlight module structure as a main part at present, and the side edge of a light guide plate adopts a common white reflection structure or silver reflection structure, so that light leakage is easy, the brightness loss is large, the main reason is that the reflectivity of a side reflection material is not high enough, meanwhile, the reflection layer can have a light transmission condition, and the reflection material can generate light loss due to light transmission, so that the display brightness of the whole display screen can be reduced, and meanwhile, the risk of light leakage exists.
On the other hand, the display frame of the traditional liquid crystal display pursues to be narrower and narrower, and the frame distance covering the edge part of the light guide plate is narrower and narrower, so that the existing backlight module side reflection structure cannot completely meet the requirement, the narrower the frame distance is, the easier the light reflected by the backlight module side reflection structure is to be emitted from the inner side of the frame, namely, the greater the risk of light leakage of bright lines is.
Therefore, improvement is urgently needed to overcome the defects in the prior art.
Disclosure of Invention
An object of the application is to provide a backlight module and a display module to solve the bad optical problem of marginal bright line.
The embodiment of the application provides a backlight unit, backlight unit includes: a backlight source; the light guide plate comprises a side light incoming surface, a light outgoing surface, a bottom reflecting surface and a side reflecting surface, wherein the side light incoming surface is arranged corresponding to the backlight source; the side reflecting surface is provided with an ink layer, the ink layer comprises a white ink layer and a black ink layer, and the black ink layer is arranged on one side, away from the side reflecting surface, of the white ink layer.
Optionally, in some embodiments of the present application, the side reflective surface is a polished surface, and the ink layer is applied to the side reflective surface by printing or painting.
Optionally, in some embodiments of the present application, the light guide plate has an edge region, and at least the black ink layer in the ink layers covers the light-ejecting surface located in the edge region.
Optionally, in some embodiments of the present application, a material particle diameter of the white ink layer is smaller than a material particle diameter of the black ink layer.
Optionally, in some embodiments of the present application, a reflective film is disposed on the bottom reflective surface, and the reflective film includes: at least one of an enhanced specular reflection film, a metal reflection film, and a white plastic reflection film.
Optionally, in some embodiments of the present application, the inner side of the bottom reflection surface and/or the side reflection surface of the light guide plate is provided with a mesh point.
Optionally, in some embodiments of the present application, the density of the dots on the side close to the backlight is greater than the density of the dots on the side far from the backlight.
Optionally, in some embodiments of the present application, the backlight module further includes a back plate and a frame, where the back plate and the frame form an accommodating cavity for accommodating the backlight source and the light guide plate; the backlight source is arranged on at least one inner side face of the frame; the light guide plate is arranged on the back plate and is positioned in the accommodating cavity.
Optionally, in some embodiments of the present application, the backlight module further includes: the diffusion film is correspondingly arranged on the light ejecting surface of the light guide plate; and the brightness enhancement film is arranged on one side of the diffusion film, which is far away from the light guide plate.
Correspondingly, the embodiment of the application also provides a display module, which comprises the backlight module and a display panel arranged on the backlight module; wherein the display panel includes: the array substrate is arranged on the backlight module; the color film substrate is arranged opposite to the array substrate and is positioned on one side of the array substrate, which is far away from the backlight module; and the liquid crystal layer is arranged between the array substrate and the color film substrate.
To sum up, the embodiment of the present application provides a backlight module, the backlight module includes: a backlight source; the light guide plate comprises a side light incoming surface, a light outgoing surface, a bottom reflecting surface and a side reflecting surface, wherein the side light incoming surface is arranged corresponding to the backlight source; the side reflecting surface is provided with an ink layer, the ink layer comprises a white ink layer and a black ink layer, and the black ink layer is arranged on one side, away from the side reflecting surface, of the white ink layer. The side reflecting surface is polished, so that the adhesion between the white ink layer and the side reflecting surface can be enhanced, the white ink layer can enable light rays from the light guide plate to be reflected back into the light guide plate at the side reflecting surface, and the utilization rate of the light rays by the light guide plate is improved; the black ink layer can absorb light, reduce light leakage from the edge of the light guide plate and improve the problem of poor optics of edge bright lines so as to achieve good visual effect and product quality.
Furthermore, dots are arranged on the inner side of the bottom reflecting surface and/or the inner side of the side reflecting surface of the light guide plate, and the density of the dots close to the backlight source side is greater than that of the dots far away from the backlight source side. The arrangement can enable the screen dots far away from the backlight source to reflect more light, and further increase the luminous intensity reflected from the side far away from the backlight source, so that the overall brightness uniformity of the backlight module is ensured.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic plan view of a backlight module according to an embodiment of the present application;
FIG. 2 is a schematic perspective view of a light guide plate according to an embodiment of the present disclosure;
FIG. 3 is a first schematic cross-sectional view illustrating a backlight module according to an embodiment of the present disclosure;
FIG. 4 is a schematic cross-sectional view of a second exemplary embodiment of a backlight module;
FIG. 5 is a schematic cross-sectional view illustrating a third exemplary embodiment of a backlight module;
FIG. 6 is a schematic diagram of a light guide plate for guiding incident light according to an embodiment of the present disclosure;
fig. 7 is a schematic cross-sectional structure diagram of the display module in the embodiment of the present application.
Description of the main reference numerals:
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application. Furthermore, it should be understood that the detailed description and specific examples, while indicating exemplary embodiments of the invention, are given by way of illustration and explanation only, and are not intended to limit the scope of the invention. In the present application, unless otherwise stated, the use of directional terms such as "upper", "lower", "left" and "right" may refer to the actual use or operation of the device, may refer to the drawing direction in the drawings, and may refer to two opposite directions; while "inner" and "outer" are with respect to the outline of the device.
Referring to fig. 1 to fig. 7, in particular, an embodiment of the present invention provides a backlight module 100, where the backlight module 100 includes: a backlight 110; a light guide plate 120, including a light incident side surface 121, a light exiting surface 122, a bottom reflection surface 123 and a light reflecting side surface 124, where the light incident side surface 121 is disposed corresponding to the backlight 110; the side reflective surface 124 is provided with an ink layer 130, the ink layer 130 includes a white ink layer 131 and a black ink layer 132, and the black ink layer 132 is disposed on a side of the white ink layer 131 away from the side reflective surface 124. Preferably, the light guide plate 120 is a flat light guide plate, the light guide plate 120 has six surfaces, and for a side-in type backlight, a side light distribution is usually adopted to reduce the number of light sources, so as to obtain a smaller space occupation, which is beneficial to reducing the power consumption of the backlight 120, that is, at this time, the light guide plate 120 has one side light incident surface 121, one light exit surface 122, one bottom reflection surface 123, and three side reflection surfaces 124, and the ink layers 130 are disposed on all three side reflection surfaces 124. Further, when the backlight sources 110 are added, that is, the backlight sources 110 are arranged on two sides or even three sides, that is, one side incident surface 121 is not added, one side reflecting surface 124 is correspondingly decreased.
As shown in fig. 3, the side reflective surface 124 is a polished surface, and the ink layer 130 is applied to the side reflective surface 124 by printing or painting. That is, when the ink layer 130 is printed or painted on the side reflective surface 124, the side reflective surface 124 is polished to form a polished surface, and then the white ink layer 131 is coated, and the black ink layer 132 is coated to form the ink layer 130. The side reflective surface 124 is polished to enhance adhesion between the white ink layer 131 and the side reflective surface 124. The white ink layer 131 can enable the light from the light guide plate 120 to be reflected back into the light guide plate 120 at the side reflection surface 124, so that the utilization rate of the light by the light guide plate 120 is improved. The black ink layer 132 can absorb light, reduce light leakage from the edge of the light guide plate 120, and improve the problem of poor optics of edge bright lines, so as to achieve good visual effect and product quality. Preferably, the diameter of the material particles of the white ink layer 131 is smaller than that of the material particles of the black ink layer 132. The diameter of the material particles of the white ink layer 131 is relatively small, so that the adhesion force with the side reflecting surface 124 can be enhanced; the particle diameter of the black ink layer 132 is relatively large, so that the light absorption effect of the black ink layer 132 can be enhanced.
As shown in fig. 4, in an embodiment, the light guide plate 120 has an edge region 126, and at least the black ink layer 132 in the ink layer 130 covers the light-emitting surface 122 located in the edge region 126. That is, the black ink layer 132 is coated on the light-emitting surface 122 located in the edge region 126 in addition to the side reflective surface 124, so as to prevent light from leaking from the edge of the light-emitting surface 122 of the light guide plate 120, further improve the optical defect problem of edge bright lines, increase the brightness difference between the edge region 126 and other regions, and improve the light leakage problem of the backlight module 100, thereby achieving good visual effect and product quality.
In one embodiment, a reflective film 140 is disposed on the bottom reflective surface, the reflective film comprising: at least one of an enhanced specular reflection film, a metal reflection film, and a white plastic reflection film. The reflective film 140 can reflect light emitted thereto and emit the reflected light again, thereby increasing the utilization rate of the light. Enhanced specular reflection film (ESR film) is a film that integrates 1000 layers of thin film in a thickness of 100 microns or more, using multilayer film technology. The ESR film does not contain a little metal, is a multilayer film structure made of PET resin as a raw material, is a green environment-friendly reflecting material, utilizes the birefringence characteristic of polymers and precisely controls the thickness of the film, and can uniformly reflect optical fibers in visible light wavelength, so that the ESR film has high reflectivity and no dry color or light and shade color cast. As a high efficiency reflective film, ESR film has a reflectance of 98% or more over the entire visible spectrum, which is higher than other types of reflective films. The metal reflecting film has relatively large extinction coefficient, when light beam is incident to the metal surface from air, the light amplitude entering the metal is quickly attenuated, so that the light energy entering the metal is correspondingly reduced, and the reflected light energy is increased. For a white plastic reflective film, light rays are scattered on the surface, and meanwhile, a part of light rays are refracted to enter a film medium, and due to a large amount of fillers and/or micro bubbles in the film, the light rays can be reflected, refracted and re-reflected when encountering the foreign matters, particularly the light rays with the refractive index of 1.0 of the medium in the micro bubbles can be reflected on the inner surface of the micro bubbles and refracted at a larger angle.
Preferably, ESR film is used as the reflective film 140 in this application. The ESR film has a metal total reflection effect, is not made of any metal material, has high reflection surfaces on both surfaces, is provided with a plastic protective film on both surfaces to protect the mirror surface from being polluted, is a very uniform smooth surface with extremely high reflectivity, has no damage such as tube folding marks or folds on the reflection surface, and can greatly improve the backlight brightness of the backlight module 100.
As shown in fig. 5 and 6, in an embodiment, dots 125 are disposed on the inner side of the bottom reflection surface 123 and/or the side reflection surface 124 of the light guide plate 120. The light guide plate 120 is a printed light guide plate, and the dots 125 are printed on the bottom reflection surface 123 and/or the side reflection surface 124 in a printing manner, so that the printing speed is high, and the production efficiency is high. The light guide plate 120 functions inside the backlight module 100 to convert the side human light provided by the backlight 110 into a surface light source by the internal reflection principle. Incident light entering the light guide plate 120 from the light incident side surface 121 and hitting the dots 125 of the bottom reflection surface 123 and/or the side reflection surface 124 are subjected to diffuse reflection and then emitted to the light emitting surface 122; the light not contacting the dots 125 is totally reflected inside the light guide plate 120 continuously by the ink layer 130 disposed on the side reflective surface 124 and the reflective film 140 disposed on the bottom reflective surface 123, and finally emitted to the light-emitting surface 122 after being diffusely reflected by the dots 125. The light guide plate 120 is preferably made of polymethyl methacrylate, which can provide the light guide plate 120 with heat shrinkage, high transmittance, temperature and humidity stability, and scratch resistance.
Preferably, the density of the dots 125 on the side close to the backlight 110 is greater than the density of the dots 125 on the side away from the backlight 110. In other words, the dots 125 are more and more dense in a direction away from the backlight 110. Because the backlight brightness near the backlight source 110 is relatively high, the dots 125 far from the backlight source 110 can reflect more light, and the luminous intensity reflected by the side far from the backlight source 110 is further increased, so that the overall brightness uniformity of the backlight module 100 is ensured.
As shown in fig. 3 to fig. 5, in an embodiment of the present invention, the backlight module 100 further includes a back plate 150 and a frame 160, wherein the back plate 150 and the frame 160 form an accommodating cavity 170 for accommodating the backlight source 110 and the light guide plate 120; wherein the backlight source 110 is disposed on at least one inner side surface of the frame 160; the light guide plate 120 is disposed on the back plate 150 and located in the receiving cavity 170. In addition, the backlight module 100 further includes: a diffusion film 180 correspondingly disposed on the light-emitting surface 122 of the light guide plate 120; a brightness enhancement film 190 disposed on a side of the diffusion film 180 away from the light guide plate 120. The diffusion plate 180 and the brightness enhancement film 190 are fixed to the frame 160 by sealant 161. In this embodiment, the diffusion film 180 mainly plays a role of correcting a diffusion angle in the backlight structure, so that a light radiation area is increased. After the light emitted from the backlight source 110 is diffused by the diffusion film 180, the light can become a secondary light source with a larger area, better uniformity and stable chromaticity. The diffusion film 180 has a function of diffusing light, that is, light is scattered on the surface thereof, so that light is diffused softly and uniformly, the directivity of light emitted from the light guide plate 120 is reduced, and defects of optical quality such as scratch and black spot of an optical film, which may exist on the display surface, are blurred. The brightness enhancement film 190 achieves light re-control and brightness enhancement. Preferably, the brightness enhancement film 190 comprises a Multi-Functional Prism Sheet (Multi-Functional Prism Sheet).
Referring to fig. 7, in particular, the present embodiment further provides a display module 10, including the backlight module 100 in the above embodiment and a display panel 200 disposed on the backlight module 100; the display panel 200 includes: an array substrate 210 disposed on a light emitting side of the backlight module 100; the color film substrate 220 is arranged opposite to the array substrate 210 and is located on one side of the array substrate 210 away from the backlight module 100; the liquid crystal layer 230 is disposed between the array substrate 210 and the color film substrate 220. The array substrate 210, the color filter substrate 220, and the liquid crystal layer 230 may be conventional structures in the art, and the present application is not limited thereto. The display module 10 can be applied to any product or component with a display function, such as a mobile phone, a tablet personal computer, a television, a display, a notebook computer, a digital photo frame, a navigator and the like. Other essential components of the display module 10 should be understood by those skilled in the art, and are not described herein nor should they be considered as limiting the present application. The implementation of the display module 10 can refer to the above-mentioned embodiment of the backlight module 100, and repeated descriptions are omitted.
To sum up, the embodiment of the present application provides a backlight module 100, the backlight module 100 includes: a backlight 110; a light guide plate 120, including a light incident side surface 121, a light exiting surface 122, a bottom reflection surface 123 and a light reflecting side surface 124, where the light incident side surface 121 is disposed corresponding to the backlight 110; the side reflective surface 124 is provided with an ink layer 130, the ink layer 130 includes a white ink layer 131 and a black ink layer 132, and the black ink layer 132 is disposed on a side of the white ink layer 131 away from the side reflective surface 124. The white ink layer 131 can enable the light from the light guide plate 120 to be reflected back into the light guide plate 120 at the side reflection surface 124, so that the utilization rate of the light by the light guide plate 120 is improved. The black ink layer 132 can absorb light, reduce light leakage from the edge of the light guide plate 120, and improve the problem of poor optics of edge bright lines, so as to achieve good visual effect and product quality.
Further, dots 125 are disposed on the inner side of the bottom reflection surface 123 and/or the side reflection surface 124 of the light guide plate 120, and the density of the dots 125 on the side close to the backlight 110 is greater than the density of the dots 125 on the side far from the backlight 110. The arrangement enables the dots 125 far away from the backlight source 110 to reflect more light, and further increases the luminous intensity reflected from the side far away from the backlight source 110, so as to ensure the overall brightness uniformity of the backlight module 100.
In the foregoing embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.
The backlight module 100 and the display module 10 provided in the embodiments of the present application are described in detail above, and specific examples are applied herein to explain the principle and the embodiments of the present application, and the description of the embodiments is only used to help understand the method and the core idea of the present application; meanwhile, for those skilled in the art, according to the idea of the present application, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present application.
Claims (10)
1. A backlight module is characterized in that the backlight module comprises:
a backlight source;
the light guide plate comprises a side light incoming surface, a light outgoing surface, a bottom reflecting surface and a side reflecting surface, wherein the side light incoming surface is arranged corresponding to the backlight source; wherein
The side reflecting surface is provided with an ink layer, the ink layer comprises a white ink layer and a black ink layer, and the black ink layer is arranged on one side, away from the side reflecting surface, of the white ink layer.
2. The backlight module of claim 1, wherein the side reflective surface is a polished surface, and the ink layer is applied to the side reflective surface by printing or painting.
3. The backlight module as claimed in claim 1, wherein the light guide plate has an edge region, and at least the black ink layer in the ink layers covers the light-emitting-out surface at the edge region.
4. The backlight module as claimed in claim 1, wherein the diameter of the particles of the white ink layer is smaller than the diameter of the particles of the black ink layer.
5. The backlight module as claimed in claim 1, wherein a reflective film is disposed on the bottom reflective surface, the reflective film comprising: at least one of an enhanced specular reflection film, a metal reflection film, and a white plastic reflection film.
6. The backlight module according to claim 1, wherein the inner side of the bottom reflective surface and/or the side reflective surface of the light guide plate is provided with dots.
7. The backlight module as set forth in claim 6, wherein the density of the dots on a side close to the backlight source is greater than the density of the dots on a side far from the backlight source.
8. The backlight module as claimed in claim 1, wherein the backlight module further comprises a back plate and a frame, the back plate and the frame forming a receiving cavity for receiving the backlight source and the light guide plate; wherein
The backlight source is arranged on at least one inner side face of the frame; the light guide plate is arranged on the back plate and is positioned in the accommodating cavity.
9. The backlight module of claim 8, wherein the backlight module further comprises:
the diffusion film is correspondingly arranged on the light ejecting surface of the light guide plate;
and the brightness enhancement film is arranged on one side of the diffusion film, which is far away from the light guide plate.
10. A display module comprising the backlight module according to any one of claims 1 to 9 and a display panel disposed on the backlight module; wherein
The display panel includes:
the array substrate is arranged on the backlight module;
the color film substrate is arranged opposite to the array substrate and is positioned on one side of the array substrate, which is far away from the backlight module;
and the liquid crystal layer is arranged between the array substrate and the color film substrate.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111590127.XA CN114280843A (en) | 2021-12-23 | 2021-12-23 | Backlight module and display module |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111590127.XA CN114280843A (en) | 2021-12-23 | 2021-12-23 | Backlight module and display module |
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| CN114280843A true CN114280843A (en) | 2022-04-05 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US11774668B1 (en) | 2023-01-07 | 2023-10-03 | Chicony Power Technology Co., Ltd. | Light-emitting module |
| WO2024020865A1 (en) * | 2022-07-26 | 2024-02-01 | 苏州长风航空电子有限公司 | Backlight dislplay method and apparatus thereof |
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| CN212060820U (en) * | 2020-05-19 | 2020-12-01 | 中强光电股份有限公司 | Light source module and display device |
| CN111766741A (en) * | 2020-06-25 | 2020-10-13 | 博讯光电科技(合肥)有限公司 | Light guide plate black edge structure applied to ultra-narrow display module and setting method thereof |
| CN112415814A (en) * | 2021-01-06 | 2021-02-26 | 广东中强精英电子科技有限公司 | Backlight module with light leakage prevention high-reflection side reflection structure |
| CN214895884U (en) * | 2021-03-30 | 2021-11-26 | 东莞市钜欣电子有限公司 | Light guide module capable of improving brightness and reducing cost |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024020865A1 (en) * | 2022-07-26 | 2024-02-01 | 苏州长风航空电子有限公司 | Backlight dislplay method and apparatus thereof |
| US11774668B1 (en) | 2023-01-07 | 2023-10-03 | Chicony Power Technology Co., Ltd. | Light-emitting module |
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