CN116149099B - Backlight module and display device - Google Patents
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- CN116149099B CN116149099B CN202310427848.1A CN202310427848A CN116149099B CN 116149099 B CN116149099 B CN 116149099B CN 202310427848 A CN202310427848 A CN 202310427848A CN 116149099 B CN116149099 B CN 116149099B
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Classifications
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133621—Illuminating devices providing coloured light
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133609—Direct backlight including means for improving the color mixing, e.g. white
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133612—Electrical details
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- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- Mathematical Physics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Planar Illumination Modules (AREA)
Abstract
The application provides a backlight unit, backlight unit include the backplate, the backplate include backplate main part and curb plate subassembly, the curb plate subassembly connect in the periphery department of backplate main part to enclose into the accommodation space with the backplate main part. The backlight module further comprises a light emitting assembly, the light emitting assembly comprises a plurality of light emitting units, each light emitting unit comprises a first light emitting element, a second light emitting element, a third light emitting element and a fourth light emitting element, the first light emitting element is used for emitting first color light, the second light emitting element is used for emitting second color light, the third light emitting element is used for emitting third color light, and the fourth light emitting element is used for emitting fourth color light, so that the light emitting assembly emits colorful backlight. Therefore, the light-emitting component provides color backlight for the display panel, the color gamut and dynamic contrast of the picture displayed by the display panel are improved, and the visual effect is further improved. The application also provides a display device with the backlight module.
Description
Technical Field
The present disclosure relates to the field of display technologies, and particularly to a backlight module and a display device having the backlight module.
Background
In recent years, liquid crystal display devices are increasingly used in various fields, and among them, electronic products having a display function such as notebook computers, mobile phones, televisions, and tablet computers are indispensable in life.
The liquid crystal display device generally includes a display panel and a backlight module, wherein the backlight module provides backlight to the display panel. At present, the backlight provided by the backlight module is white, and the display panel converts the white backlight into color light. However, the color light formed only by the display panel has a low color gamut range and is difficult to promote.
Therefore, how to solve the problem that the color gamut of the display device in the prior art is low and difficult to be improved is a urgent need for those skilled in the art.
Disclosure of Invention
In view of the above-mentioned shortcomings of the prior art, an objective of the present application is to provide a backlight module and a display device having the same, which are aimed at solving the problems of the prior art that the color gamut of the display device is low and difficult to be lifted.
In order to solve the technical problem, the embodiment of the application provides a backlight module, the backlight module includes a backboard, the backboard includes a backboard main body and a side board assembly, the side board assembly is connected to the periphery of the backboard main body, and the side board assembly and the backboard main body enclose into a containing space. The backlight module further comprises a light emitting assembly, the light emitting assembly comprises a driving plate and a plurality of light emitting units, the driving plate is arranged in the accommodating space and connected with the backboard main body, each light emitting unit comprises a first light emitting element, a second light emitting element, a third light emitting element and a fourth light emitting element, the first light emitting element, the second light emitting element, the third light emitting element and the fourth light emitting element are arranged on one side, opposite to the backboard main body, of the driving plate and electrically connected with the driving plate, and the driving plate is used for driving the first light emitting element, the second light emitting element, the third light emitting element and the fourth light emitting element to emit light. The first light-emitting element is used for emitting first color light, the second light-emitting element is used for emitting second color light, the third light-emitting element is used for emitting third color light, and the fourth light-emitting element is used for emitting fourth color light, so that the light-emitting assembly emits colored backlight.
In summary, the backlight module provided by the embodiment of the application provides a color backlight for the display panel through the light emitting component of the backlight module, rather than forming a color light through the display panel, so that the color gamut and dynamic contrast of the picture displayed by the display panel are improved, and the visual effect is further improved.
In an exemplary embodiment, the first light emitting element is disposed opposite to the fourth light emitting element, the second light emitting element is disposed opposite to the third light emitting element, and a line connecting the first light emitting element and the fourth light emitting element intersects a line connecting the second light emitting element and the third light emitting element.
In an exemplary embodiment, the light emitting unit further includes a light guide element covering the first, second, third, and fourth light emitting elements. The light guide element is used for mixing the first color light, the second color light, the third color light and the fourth color light to form the colored backlight, and the fourth color light is used for adjusting the brightness of the backlight and harmonizing the color vividness of the backlight.
In an exemplary embodiment, the light guiding element includes a light reflecting surface, a light emitting surface, and a peripheral side surface. The light reflecting surface is arranged among the first light emitting element, the second light emitting element, the third light emitting element and the fourth light emitting element, the light emitting surface is arranged on one side of the light reflecting surface opposite to the driving plate and is arranged at intervals with the light reflecting surface, and the peripheral side surface is connected between the light reflecting surface and the light emitting surface and covers the first light emitting element, the second light emitting element, the third light emitting element and the fourth light emitting element. The peripheral side surface is used for refracting the first color light, the second color light, the third color light and the fourth color light to the reflecting surface to form the colored backlight, and the reflecting surface is used for reflecting the colored backlight to the light emitting surface.
In an exemplary embodiment, the angle between the peripheral side surface and the normal to the light-reflecting surface is 40 degrees to 65 degrees.
In an exemplary embodiment, the light emitting unit further includes a plurality of reflective elements, wherein the reflective elements are disposed on sides of the first, second, third, and fourth light emitting elements facing away from the driving plate, and one ends of the reflective elements facing away from the driving plate are inclined inward, and the reflective elements are respectively configured to reflect the first, second, third, and fourth color lights to the peripheral side surfaces.
In an exemplary embodiment, the light emitting unit further includes a first light transmitting sheet, a second light transmitting sheet, a third light transmitting sheet and a fourth light transmitting sheet disposed on the peripheral side surface, wherein the first light transmitting sheet is configured to transmit the first color light, the third color light and the fourth color light, the third light transmitting sheet is configured to transmit the third color light, the fourth color light and the fourth color light, and the third light transmitting sheet is configured to transmit the first color light, the third color light and the fourth color light, and the fourth light transmitting sheet is configured to transmit the third color light, the fourth color light and the fourth color light, and the first light transmitting sheet is configured to transmit the first color light, the second color light and the fourth color light.
In an exemplary embodiment, the backlight module further includes a light shielding layer disposed between adjacent light emitting units, the light shielding layer being for shielding light.
In an exemplary embodiment, the driving board includes a plurality of control units electrically connected with at least one of the light emitting units. The control unit is used for receiving the color signal and the brightness signal, controlling the light-emitting unit to emit the backlight with corresponding color according to the color signal and controlling the light-emitting unit to emit the backlight with corresponding brightness according to the brightness signal.
Based on the same inventive concept, the embodiment of the application also provides a display device, which comprises a display panel and the backlight module, wherein the display panel is arranged on the light emitting side of the backlight module.
In summary, the display device provided in the embodiments of the present application includes a display panel and a backlight module, where the backlight module provides a color backlight for the display panel through a light emitting component of the backlight module, rather than forming a color light through the display panel, so that a color gamut and a dynamic contrast of a picture displayed by the display panel are improved, and a visual effect is further improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic layer structure of a display device according to a first embodiment of the present disclosure;
fig. 2 is a schematic layer structure of a backlight module according to a second embodiment of the present disclosure;
FIG. 3 is an enlarged schematic view of a structure III in the backlight module shown in FIG. 2;
FIG. 4 is a schematic top view of the driving board and the light emitting device shown in FIG. 3;
FIG. 5 is a schematic diagram of a layer structure of the light emitting unit and the driving board shown in FIG. 2;
FIG. 6 is a schematic diagram of the light guiding principle of the light guiding element;
fig. 7 is a schematic bottom view of the light guiding element shown in fig. 3.
Reference numerals illustrate:
1-a display device; 10-a display panel; 30-a backlight module; 31-a back plate; 33-a light emitting assembly; 36-a light shielding layer; 37-an optical film assembly; 38-a rubber frame assembly; 39-a support element; 301-accommodating space; 311-a backplate body; 312-side plate assembly; 312 a-a mounting surface; 330-a drive plate; 340-a light emitting unit; 341-a first light emitting element; 342-a second light-emitting element; 343-a third light emitting element; 344-fourth light emitting elements; 346-a light guiding element; 346 a-a reflective surface; 346 b-light exit face; 346 c-peripheral side; 347-a light reflecting layer; 348—a reflective element; 349 a-first light-transmitting sheet; 349 b-second light transmitting sheet; 349 c-third light transmitting sheet; 349 d-fourth light transmitting sheet; 381-first glue frame; 382-second glue frame.
Detailed Description
In order to facilitate an understanding of the present application, a more complete description of the present application will now be provided with reference to the relevant figures. Preferred embodiments of the present application are shown in the accompanying drawings. This application may, however, be embodied in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
The following description of the embodiments refers to the accompanying drawings, which illustrate specific embodiments that can be used to practice the present application. The numbering of the components itself, e.g. "first", "second", etc., is used herein merely to distinguish between the described objects and does not have any sequential or technical meaning. The terms "coupled" and "connected," as used herein, are intended to encompass both direct and indirect coupling (coupling), unless otherwise indicated. Directional terms referred to in this application, such as "upper", "lower", "front", "rear", "left", "right", "inner", "outer", "side", etc., are merely directions referring to the attached drawings, and thus, directional terms are used for better, more clear description and understanding of the present application, rather than indicating or implying that the apparatus or element being referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present application.
In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; may be a mechanical connection; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art in a specific context. It should be noted that the terms "first," "second," and the like in the description and claims of the present application and in the drawings are used for distinguishing between different objects and not for describing a particular sequential order. Furthermore, the terms "comprises," "comprising," "includes," "including," "may be" or "including" as used in this application mean the presence of the corresponding function, operation, element, etc. disclosed, but not limited to other one or more additional functions, operations, elements, etc. Furthermore, the terms "comprises" or "comprising" mean that there is a corresponding feature, number, step, operation, element, component, or combination thereof disclosed in the specification, and that there is no intention to exclude the presence or addition of one or more other features, numbers, steps, operations, elements, components, or combinations thereof. It will also be understood that the meaning of "at least one" as described herein is one and more, such as one, two or three, etc., and the meaning of "a plurality" is at least two, such as two or three, etc., unless specifically defined otherwise.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.
Referring to fig. 1, fig. 1 is a schematic layer structure of a display device according to a first embodiment of the present disclosure. In this embodiment, the display device 1 may include a display panel 10 and a backlight module 30 that are stacked, where the display panel 10 is disposed on a light emitting side of the backlight module 30, and the display panel 10 is configured to display an image under a backlight provided by the backlight module 30.
In the embodiment of the present application, the display panel 10 may be a Twisted Nematic (TN) display panel, a vertical alignment (Vertical Alignment, VA) display panel, an In-Plane Switching (IPS) display panel, or a fringe field Switching (Fringe Field Switching, FFS) display panel, which is not particularly limited herein.
In an exemplary embodiment, the display panel 10 includes a color film substrate, a liquid crystal layer, and an array substrate that are sequentially stacked, that is, the liquid crystal layer is located between the color film substrate and the array substrate, the color film substrate and the array substrate form a corresponding preset electric field according to an image signal, and the preset electric field drives liquid crystal molecules in the liquid crystal layer to deflect so as to change the transmittance of the liquid crystal layer, so that the display panel 10 displays different gray scale brightness.
In an exemplary embodiment, the display panel 10 further includes an upper polarizer and a lower polarizer, where the upper polarizer is disposed on a side of the color film substrate opposite to the array substrate, the lower polarizer is disposed on a side of the array substrate opposite to the color film substrate, and the upper polarizer and the lower polarizer are used for converting a backlight of natural light into a backlight of polarized light. The backlight provided by the backlight module 30 sequentially passes through the lower polarizer, the array substrate, the liquid crystal layer, the color film substrate and the upper polarizer.
It will be appreciated that the display device 1 may be used in electronic devices including, but not limited to, televisions, tablet computers, notebook computers, desktop computers, mobile phones, car displays, smart watches, smart bracelets, smart glasses, etc. According to the embodiment of the present application, the specific type of the display device 1 is not particularly limited, and a person skilled in the art may perform a corresponding design according to the specific use requirement of the display device 1, which is not described herein.
In an exemplary embodiment, the display device 1 may further include other necessary components and constituent parts such as a power panel, a high-voltage board, and a key control board, which can be correspondingly supplemented by those skilled in the art according to the specific type and actual function of the display device 1, and will not be described herein.
Referring to fig. 2, fig. 2 is a schematic layer structure of a backlight module according to a second embodiment of the disclosure. The backlight module 30 includes a back plate 31, the back plate 31 includes a back plate main body 311 and a side plate assembly 312, the back plate main body 311 is opposite to the display panel 10 and is disposed at intervals, and the side plate assembly 312 is connected to the periphery of the back plate main body 311 and is located at a side of the back plate main body 311 facing the display panel 10. The backlight module 30 further includes a light emitting component 33, where the light emitting component 33 is located at a side of the back plate body 311 where the side plate component 312 is disposed, and is disposed at an inner side of the side plate component 312. That is, the back plate body 311 and the side plate assembly 312 define a receiving space 301, and the light emitting assembly 33 is disposed in the receiving space 301 and disposed at a side of the back plate body 311 facing the display panel 10. The light emitting assembly 33 is used for providing a color backlight according to a picture to be displayed by the display panel 10.
It can be understood that the screen currently displayed on the display panel 10 is red, and the light emitting component 33 can emit red backlight; the current picture displayed on the display panel 10 is green, and the light emitting component 33 can emit a green backlight; the current picture displayed on the display panel 10 is blue, and the light emitting component 33 can emit blue backlight; the display panel 10 may display a white screen, and the light emitting assembly 33 may emit a white backlight. In the prior art, only converting a white backlight into a color light with a lower color gamut range through a display panel results in a lower visual effect. The color backlight emitted by the light emitting component 33 is matched with the color filter (color resistance) of the display panel 10, so that the color gamut, dynamic contrast and vividness of the picture displayed by the display panel 10 can be improved, and the visual effect is further improved.
In an exemplary embodiment, the backlight module 30 may be a direct type backlight module, and the light emitting component 33 may be a direct type backlight.
In an exemplary embodiment, the back plate body 311 may be a rectangular plate-like structure. The side plate assembly 312 may be a hollow frame structure, and has four side plates, and the four side plates are sequentially connected end to end and respectively disposed at the periphery of the back plate main body 311, so as to define the accommodating space 301.
In an exemplary embodiment, the back plate body 311 and the side plate assembly 312 may be manufactured by integral molding.
In the embodiment of the present application, please refer to fig. 3, fig. 3 is an enlarged schematic diagram of a structure III in the backlight module shown in fig. 2. The light emitting assembly 33 includes a driving plate 330 and a plurality of light emitting units 340, the driving plate 330 is disposed in the accommodating space 301 and connected to the back plate main body 311, the light emitting units 340 are disposed on a side of the driving plate 330 opposite to the back plate main body 311, and the light emitting units 340 are arrayed and spaced from each other. The light emitting units 340 are electrically connected to the driving board 330, the driving board 330 is configured to drive the light emitting units 340 to emit light, and the light emitting units 340 are configured to emit the backlight of a corresponding color or not according to a picture to be displayed on the display panel 10.
It can be understood that the display panel 10 displays red color corresponding to the display area of the light emitting unit 340, and the light emitting unit 340 may emit red backlight; the display panel 10 displays green color corresponding to the display area of the light emitting unit 340, and the light emitting unit 340 may emit green backlight; the display panel 10 displays blue color corresponding to the display area of the light emitting unit 340, and the light emitting unit 340 may emit blue backlight; the display panel 10 displays white color corresponding to the display area of the light emitting unit 340, and the light emitting unit 340 may emit white backlight; the display panel 10 displays black corresponding to the display area of the light emitting unit 340, and the light emitting unit 340 may not emit light. In the prior art, only a display panel is used for converting a white backlight into colored light with a lower color gamut range, which easily results in lower visual effect. The light emitting unit 340 is configured to emit backlight of a corresponding color or not according to a picture to be displayed by the display panel 10, so that the color gamut and dynamic contrast of the picture displayed by the display panel 10 are improved, and further, the visual effect is improved.
In an exemplary embodiment, the colors of the backlights emitted by the adjacent light emitting units 340 may be the same or different according to the picture to be displayed by the display panel 10, and the adjacent light emitting units 340 may emit light or not, respectively, which is not particularly limited in this application.
In an exemplary embodiment, the driving plate 330 and the back plate body 311 may be adhered by a double sided tape.
In an exemplary embodiment, one of the light emitting units 340 may correspond to 1 to 10 pixel groups of the display panel 10, for example, 1, 3, 5, 6, 8, 10, or other numbers, which are not particularly limited in this application. That is, one of the light emitting units 340 may provide the backlight to 1 to 10 of the pixel groups. It can be understood that the fewer the number of the pixel groups corresponding to the light emitting units 340, the finer the color of the backlight provided by the light emitting units, and the finer the image display of the display panel 10, but the higher the cost of the backlight module 30. One of the pixel groups comprises three sub-pixels, and the three sub-pixels respectively emit red light, green light and blue light.
It should be noted that, the backlight module 30 shown in fig. 2 is only a schematic diagram, and the number of the light emitting units 340 may be determined by the size of the backlight module 30 and the size of the light emitting units 340, which is not particularly limited in this application.
In the embodiment of the application, please refer to fig. 3 and fig. 4 together, fig. 4 is a schematic top view of the driving board and the light emitting device shown in fig. 3. Each of the light emitting units 340 includes a first light emitting element 341, a second light emitting element 342, a third light emitting element 343, and a fourth light emitting element 344. The first light emitting element 341, the second light emitting element 342, the third light emitting element 343, and the fourth light emitting element 344 are disposed on a side of the driving board 330 opposite to the back board main body 311, and are electrically connected to the driving board 330. The first light emitting element 341 is configured to emit light of a first color, the second light emitting element 342 is configured to emit light of a second color, the third light emitting element 343 is configured to emit light of a third color, and the fourth light emitting element 344 is configured to emit light of a fourth color.
In an exemplary embodiment, the first, second, third, and fourth Light Emitting elements 341, 342, 343, and 344 may be sub-millimeter Light Emitting diodes (Mini LEDs). The first color light may be red light, the second color light may be green light, the third color light may be blue light, and the fourth color light may be white light. That is, the four light emitting elements of one light emitting unit 340 can emit red light, green light, blue light and white light, respectively.
It is understood that the backlight in which the light emitting unit 340 emits color can be realized by adjusting the brightness of red light, green light, and blue light, respectively, and the white light emitted from the light emitting element is used to adjust the overall light emitting brightness of the light emitting unit 340.
In summary, the backlight module 30 provided in this embodiment of the disclosure includes the back plate 31, the back plate 31 includes the back plate main body 311 and the side plate assembly 312, the side plate assembly 312 is connected to the periphery of the back plate main body 311 and encloses the accommodation space 301 with the back plate main body 311, the backlight module 30 further includes the light emitting assembly 33, the light emitting assembly 33 includes the driving plate 330 and the plurality of light emitting units 340, the driving plate 330 is disposed in the accommodation space 301 and is connected to the back plate main body 311, each light emitting unit 340 includes a first light emitting element 341, a second light emitting element 342, a third light emitting element 343 and a fourth light emitting element 344, the first light emitting element 341, the second light emitting element 342, the third light emitting element 343 and the fourth light emitting element 344 are disposed on a side of the driving plate 330 opposite to the back plate main body 311 and are electrically connected to the driving plate 330, and the driving plate 330 is configured to drive the first light emitting element 341, the second light emitting element 342, the third light emitting element 343 and the fourth light emitting element 343 are configured to emit light of the first color light, and the fourth light emitting element 342 is configured to emit light of the fourth color light of the first color light of the light emitting element 341. Therefore, in the display device 1 of the present application, the light emitting component 33 is used for providing a colored backlight for the display panel 10, and not just forming colored light through the display panel 10, so that the color gamut and dynamic contrast of the picture displayed by the display panel 10 are improved, and further, the visual effect is improved.
In this embodiment, the first light emitting element 341 is disposed opposite to the fourth light emitting element 344, the second light emitting element 342 is disposed opposite to the third light emitting element 343, and a line between the first light emitting element 341 and the fourth light emitting element 344 intersects a line between the second light emitting element 342 and the third light emitting element 343.
It is understood that the overall shape of the first light emitting element 341, the second light emitting element 342, the third light emitting element 343, and the fourth light emitting element 344 formed on the driving board 330 may be a hollow quadrangle, that is, the centers of the orthographic projections of the first light emitting element 341, the second light emitting element 342, the fourth light emitting element 344, and the third light emitting element 343 on the driving board 330 are sequentially connected to form a quadrangle. The first light emitting element 341 may be spaced apart from the adjacent second light emitting element 342 and the adjacent third light emitting element 343, and the fourth light emitting element 344 may be spaced apart from the adjacent second light emitting element 342 and the adjacent third light emitting element 343, respectively.
It may be further appreciated that, by the overall arrangement of the first light emitting element 341, the second light emitting element 342, the third light emitting element 343, and the fourth light emitting element 344 being hollow quadrangle, the size of the light emitting unit 340 is reduced, and the layout space of the light emitting assembly 33 is saved, that is, more light emitting units 340 may be formed on the driving board 330 with the same size, so that the backlight provided by the backlight module 30 is finer and milder.
Further, a line between the first light emitting element 341 and the fourth light emitting element 344 is perpendicular to a line between the second light emitting element 342 and the third light emitting element 343. That is, the first light emitting element 341, the second light emitting element 342, the third light emitting element 343, and the fourth light emitting element 344 are sequentially connected to form a rectangle at the center of the orthographic projection on the driving board 330.
In this embodiment, referring to fig. 3, the light emitting unit 340 further includes a light guiding element 346, where the light guiding element 346 is disposed on a side of the driving board 330 opposite to the back board main body 311, and covers the first light emitting element 341, the second light emitting element 342, the third light emitting element 343, and the fourth light emitting element 344, that is, orthographic projections of the first light emitting element 341, the second light emitting element 342, the third light emitting element 343, and the fourth light emitting element 344 on the driving board 330 are located in orthographic projections of the light guiding element 346 on the driving board 330. The light guide element 346 is configured to mix the first color light, the second color light, the third color light, and the fourth color light together to form the colored backlight, wherein the fourth color light is configured to adjust brightness of the colored backlight and to harmonize color vividness of the colored backlight.
In an exemplary embodiment, referring to fig. 5, fig. 5 is a schematic layer structure of the light emitting unit and the driving board shown in fig. 2. The light guide element 346 includes a light reflecting surface 346a, a light emitting surface 346b, and a peripheral surface 346c. The reflective surface 346a is disposed between the first light emitting element 341, the second light emitting element 342, the third light emitting element 343, and the fourth light emitting element 344, and is located at a side of the driving plate 330 opposite to the back plate main body 311. That is, the first, second, third, and fourth light emitting elements 341, 342, 343, 344 are provided on the peripheral side of the light reflecting surface 346 a. The light-emitting surface 346b is disposed on a side of the light-reflecting surface 346a opposite to the driving plate 330, and is spaced from the light-reflecting surface 346 a. The peripheral surface 346c is connected between the light reflecting surface 346a and the light emitting surface 346b, and covers the first light emitting element 341, the second light emitting element 342, the third light emitting element 343, and the fourth light emitting element 344. Wherein the light reflecting surface 346a, the light emitting surface 346b, and the peripheral surface 346c constitute an outer surface of the light guiding element 346.
Referring to fig. 6, fig. 6 is a schematic diagram of a light guiding principle of the light guiding element. The first light emitting element 341 emits the first color light to the peripheral side surface 346c, the second light emitting element 342 emits the second color light to the peripheral side surface 346c, the third light emitting element 343 emits the third color light to the peripheral side surface 346c, and the fourth light emitting element 344 emits the fourth color light to the peripheral side surface 346c. The peripheral side surface 346c is configured to refract the first color light, the second color light, the third color light, and the fourth color light to the light reflection surface 346a to form the colored backlight. The light reflecting surface 346a is used for reflecting the colored backlight to the light emitting surface 346b.
In this embodiment, referring to fig. 6, the light emitting unit 340 further includes a plurality of reflecting elements 348, wherein the reflecting elements 348 are respectively disposed on a side of the first, second, third and fourth light emitting elements 341, 342, 343 and 344 opposite to the driving plate 330, and the reflecting elements 348 are connected to the peripheral side surface 346c. The reflecting elements 348 are configured to reflect the first color light, the second color light, the third color light, and the fourth color light to the peripheral side surface 346c, respectively, so as to prevent the first color light, the second color light, the third color light, and the fourth color light from being directly emitted from the peripheral side surface 346c to the light-emitting surface 346b.
In an exemplary embodiment, an end of the plurality of reflective elements 348 facing away from the driving plate 330 is inclined toward the direction in which the reflective surface 346a is located, that is, an end of the plurality of reflective elements 348 facing away from the driving plate 330 is inclined toward the inside, and the reflective elements 348 may be prisms. Wherein an end of the reflecting element 348 opposite to the driving plate 330 means: the reflective element 348 faces away from an end of the light emitting element.
As shown in fig. 5, in an exemplary embodiment, the included angle α between the peripheral side surface 346c and the normal line of the light reflecting surface 346a is 40 degrees to 65 degrees, for example, 40 degrees, 45 degrees, 47 degrees, 50 degrees, 54 degrees, 55 degrees, 60 degrees, 65 degrees, or other values, which are not particularly limited in this application. The included angle β between the reflecting element 348 and the light emitting element is greater than or equal to 30 degrees and less than 90 degrees, for example, 30 degrees, 40 degrees, 45 degrees, 60 degrees, 67 degrees, 81 degrees, 89 degrees, or other values, which are not particularly limited in this application.
It will be appreciated that if the angle α between the peripheral side surface 346c and the normal line of the light reflecting surface 346a is smaller than 40 degrees, the peripheral side surface 346c refracts the first color light, the second color light, the third color light and the fourth color light to the edge of the light reflecting surface 346a, which is unfavorable for the mixing of the first color light, the second color light, the third color light and the fourth color light; if the angle α between the peripheral side surface 346c and the normal line of the light reflecting surface 346a is greater than 65 degrees, the peripheral side surface 346c cannot refract the first color light, the second color light, the third color light and the fourth color light to the light reflecting surface 346a. For example, the first color light may enter the light guide member 346 from one side of the peripheral side surface 346c, and may be emitted from the other side opposite to the peripheral side surface 346c without being directed toward the light reflecting surface 346a. Therefore, the included angle α between the peripheral side surface 346c and the normal line of the light reflecting surface 346a is set to be 40 to 65 degrees, which is advantageous for the sufficient mixing of the first color light, the second color light, the third color light and the fourth color light, and the light loss is small.
In an exemplary embodiment, the material of the light guide member 346 may be a resin.
In an exemplary embodiment, the overall shape of the light guiding element 346 may be a prismatic table with a rectangular bottom surface, and the cross-section of the light guiding element 346 along the axial direction may be an inverted trapezoid, that is, the light reflecting surface 346a may be an upper bottom surface of the trapezoid, and the light emitting surface 346b may be a lower bottom surface of the trapezoid, where the area of the lower bottom surface is larger than the area of the upper bottom surface.
In an exemplary embodiment, the orthographic projection of the light reflective surface 346a on the driving plate 330 is located within the orthographic projection of the light exit surface 346b on the driving plate 330.
In an exemplary embodiment, the side length of the light emitting surface 346b may be 1mm to 2mm, for example, 1mm, 1.2mm, 1.3mm, 1.5mm, 1.8mm, 1.9mm, 2mm, or other values, which are not particularly limited in this application.
In an exemplary embodiment, the peripheral side surface 346c includes four side surfaces, i.e., a first side surface, a second side surface, a third side surface, and a fourth side surface, the positions of the four side surfaces respectively correspond to the positions of the first light emitting element 341, the second light emitting element 342, the third light emitting element 343, and the fourth light emitting element 344. That is, the front projection of the first light emitting element 341 on the driving plate 330 is located in the front projection of the first side surface on the driving plate 330, the front projection of the second light emitting element 342 on the driving plate 330 is located in the front projection of the second side surface on the driving plate 330, the front projection of the third light emitting element 343 on the driving plate 330 is located in the front projection of the third side surface on the driving plate 330, and the front projection of the fourth light emitting element 344 on the driving plate 330 is located in the front projection of the fourth side surface on the driving plate 330. The side faces are used for refracting light emitted from the light emitting element corresponding thereto to the light reflecting face 346a.
Referring to fig. 5, in the embodiment of the present application, the light emitting unit 340 further includes a light reflecting layer 347, the light reflecting layer 347 is disposed between the driving plate 330 and the light guiding element 346, that is, the light reflecting layer 347 is disposed between the driving plate 330 and the light reflecting surface 346 a. The light reflecting layer 347 is configured to reflect the colored backlight to the light emitting surface 346b.
It will be appreciated that the light reflecting surface 346a is provided with light reflecting capability by being disposed in the light reflecting layer 347 between the driving plate 330 and the light reflecting surface 346 a.
In an exemplary embodiment, the light reflecting layer 347 may be white paint. That is, by coating paint or particles having reflective ability on the light reflecting surface 346a to form the light reflecting layer 347, an assembling process and material costs are saved. A heat-dissipating and heat-resistant adhesive is applied between the light-reflecting layer 347 and the driving plate 330 to fix the light-guiding element 346 to the driving plate 330, so that the light-guiding element 346 is prevented from being displaced compared with the driving plate 330.
In the embodiment, referring to fig. 3 and 4, the backlight module 30 further includes a light shielding layer 36, and the light shielding layer 36 is disposed between adjacent light emitting units 340 and connected to the driving board 330. The light shielding layer 36 is used for shielding light to avoid color crosstalk between the backlights of the adjacent light emitting units 340.
In an exemplary embodiment, one end of the light shielding layer 36 facing the driving plate 330 is disposed between the first light emitting element 341 of the light emitting unit 340 and the fourth light emitting element 344 of the adjacent light emitting unit 340 and between the second light emitting element 342 of the light emitting unit 340 and the third light emitting element 343 of the adjacent light emitting unit 340. One end of the light shielding layer 36 facing away from the driving plate 330 is disposed between the light emitting surfaces 346b of the adjacent light emitting units 340, and the surface of the light shielding layer 36 facing away from the driving plate 330 is aligned with the light emitting surfaces 346 b.
In an embodiment of the present application, referring to fig. 7, fig. 7 is a schematic bottom view of the light guiding element shown in fig. 3. The light emitting unit 340 further includes a first light transmitting sheet 349a, a second light transmitting sheet 349b, a third light transmitting sheet 349c, and a fourth light transmitting sheet 349d. The first light-transmitting sheet 349a is disposed on a side surface of the peripheral side surface 346c corresponding to the first light-emitting element 341, that is, the first light-transmitting sheet 349a is disposed above the first light-emitting element 341 and connected to the peripheral side surface 346 c. The second light-transmitting sheet 349b is disposed on a side surface of the peripheral side surface 346c corresponding to the second light-emitting element 342, that is, the second light-transmitting sheet 349b is disposed above the second light-emitting element 342 and connected to the peripheral side surface 346 c. The third light-transmitting sheet 349c is disposed on a side surface of the peripheral side surface 346c corresponding to the third light-emitting element 343, that is, the third light-transmitting sheet 349c is disposed above the third light-emitting element 343 and connected to the peripheral side surface 346 c. The fourth light-transmitting sheet 349d is disposed on a side surface of the peripheral side surface 346c corresponding to the fourth light-emitting element 344, that is, the fourth light-transmitting sheet 349d is disposed above the fourth light-emitting element 344 and connected to the peripheral side surface 346 c. That is, the first light-transmitting sheet 349a, the second light-transmitting sheet 349b, the third light-transmitting sheet 349c, and the fourth light-transmitting sheet 349d are provided on the peripheral side surface 346c, the position of the first light-transmitting sheet 349a corresponds to the position of the first light-emitting element 341, the position of the second light-transmitting sheet 349b corresponds to the position of the second light-emitting element 342, the position of the third light-transmitting sheet 349c corresponds to the position of the third light-emitting element 343, and the position of the fourth light-transmitting sheet 349d corresponds to the position of the fourth light-emitting element 344.
In an exemplary embodiment, the first light-transmitting sheet 349a is configured to transmit the first color light and block the second, third, and fourth color light. The second light-transmitting sheet 349b is configured to transmit the second color light and block the first color light, the third color light, and the fourth color light, the third light-transmitting sheet 349c is configured to transmit the third color light and block the first color light, the second color light, and the fourth light-transmitting sheet 349d is configured to transmit the fourth color light and block the first color light, the second color light, and the third color light.
It is understood that the first, second, third, and fourth color lights have different wavelength bands, and the first, second, third, and fourth light-transmitting sheets 349a, 349b, 349c, and 349d may pass light of a specific wavelength band, respectively, and cut off light outside the specific wavelength band. The first, second, third and fourth light-transmitting sheets 349a, 349b, 349c and 349d can prevent the light within the light-guiding element 346 from overflowing, which is beneficial to mixing the first, second, third and fourth color lights and improves the light-emitting brightness of the light-emitting unit 340.
In an exemplary embodiment, the first, second, third and fourth light-transmitting sheets 349a, 349b, 349c and 349d may each be a band-pass filter.
In this embodiment, referring to fig. 3, the backlight module 30 further includes an optical film assembly 37, and the optical film assembly 37 is disposed on a side of the light emitting assembly 33 opposite to the back plate body 311 and is fixed to the side plate assembly 312. That is, the optical film assembly 37 is disposed on a side of the light emitting unit 340 opposite to the driving plate 330, and covers the light emitting units 340 and the light shielding layer 36. The optical film assembly 37 is used to lighten the backlight and make the backlight more uniform.
In an exemplary embodiment, the optical film assembly 37 may include at least one prism sheet for increasing brightness of the backlight and at least one diffusion sheet for making the backlight more uniform, which are stacked.
In an exemplary embodiment, an inner side of the side plate assembly 312 opposite to the end of the back plate body 311 is recessed to form a mounting surface 312a, and the periphery of the optical film assembly 37 is disposed on the mounting surface 312a. That is, the wall thickness of the end of the side plate assembly 312 facing away from the back plate body 311 is smaller than the wall thickness of the end of the side plate assembly 312 adjacent to the back plate body 311, so that the mounting surface 312a is formed on the inner side of the end of the side plate assembly 312 facing away from the back plate body 311. Wherein, the wall thickness refers to: the distance between the inner and outer sides of the side plate assembly 312.
In an exemplary embodiment, the surface of the optical film assembly 37 facing away from the light emitting unit 340 is aligned with the end of the side plate assembly 312 facing away from the back plate body 311.
Referring to fig. 3, in the embodiment of the present application, the backlight module 30 further includes a frame assembly 38, and the frame assembly 38 includes a first frame 381 and a second frame 382. The first adhesive frame 381 is disposed on the outer side of the side plate assembly 312, and the second adhesive frame 382 is disposed on a side of the side plate assembly 312 opposite to the back plate body 311 and a periphery of the optical film assembly 37 opposite to the back plate body 311, so as to fix the periphery of the optical film assembly 37 to the side plate assembly 312.
In an exemplary embodiment, the first rubber frame 381 and the second rubber frame 382 may each be a hollow frame structure.
In an exemplary embodiment, the first rubber frame 381 and the second rubber frame 382 may be formed by integral molding.
As shown in fig. 3, in the embodiment of the present application, the backlight module 30 further includes a support element 39, where the support element 39 is disposed on a side of the second glue frame 382 opposite to the side plate assembly 312. That is, the supporting element 39 is disposed between the display panel 10 and the second frame 382. The supporting element 39 is used for supporting the display panel 10 to realize soft contact of the display panel 10 with the backlight module 30.
In an exemplary embodiment, the support element 39 may be rubber.
In this embodiment, the driving board 330 includes a plurality of control units, where the control units are electrically connected to at least one of the light emitting units 340, and the control units are configured to receive color signals and brightness signals, control the light emitting units 340 to emit backlights with corresponding colors according to the color signals, and control the light emitting units 340 to emit backlights with corresponding brightness according to the brightness signals.
In an exemplary embodiment, the light emitting assembly 33 may further include a plurality of light emitting areas, each of which is provided with at least one light emitting unit 340, and one of the control units may be electrically connected to each of the light emitting units 340 within one light emitting area to achieve area adjustment of the color and brightness of the backlight. Also, the color and brightness of the backlight of each of the light emitting areas may be individually adjusted.
Further, the control unit is electrically connected to the first, second, third and fourth light emitting elements 341, 342, 343, 344 of the light emitting unit 340, respectively. The control unit outputs a first driving signal to the first light emitting element 341 to drive the first light emitting element 341 to emit light, outputs a second driving signal to the second light emitting element 342 to drive the second light emitting element 342 to emit light, and outputs a third driving signal to the third light emitting element 343 to drive the third light emitting element 343 to emit light according to the color signal. The control unit outputs a fourth driving signal according to the brightness signal to drive the fourth light emitting element 344 to emit light.
In summary, the backlight module 30 provided in this embodiment of the disclosure includes the back plate 31, the back plate 31 includes the back plate main body 311 and the side plate assembly 312, the side plate assembly 312 is connected to the periphery of the back plate main body 311 and encloses the accommodation space 301 with the back plate main body 311, the backlight module 30 further includes the light emitting assembly 33, the light emitting assembly 33 includes the driving plate 330 and the plurality of light emitting units 340, the driving plate 330 is disposed in the accommodation space 301 and is connected to the back plate main body 311, each light emitting unit 340 includes a first light emitting element 341, a second light emitting element 342, a third light emitting element 343 and a fourth light emitting element 344, the first light emitting element 341, the second light emitting element 342, the third light emitting element 343 and the fourth light emitting element 344 are disposed on a side of the driving plate 330 opposite to the back plate main body 311 and are electrically connected to the driving plate 330, and the driving plate 330 is configured to drive the first light emitting element 341, the second light emitting element 342, the third light emitting element 343 and the fourth light emitting element 343 are configured to emit light of the first color light, and the fourth light emitting element 342 is configured to emit light of the fourth color light of the first color light of the light emitting element 341. Therefore, in the display device 1 of the present application, the light emitting component 33 is used for providing a colored backlight for the display panel 10, and not just forming colored light through the display panel 10, so that the color gamut and dynamic contrast of the picture displayed by the display panel 10 are improved, and further, the visual effect is improved.
In the description of the present specification, reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
It is to be understood that the application of the present application is not limited to the examples described above, but that modifications and variations can be made by a person skilled in the art from the above description, all of which modifications and variations are intended to fall within the scope of the claims appended hereto. Those skilled in the art will recognize that the implementations of all or part of the procedures described in the embodiments described above and in accordance with the equivalent arrangements of the claims are within the scope of the present application.
Claims (8)
1. The backlight module comprises a back plate, wherein the back plate comprises a back plate main body and a side plate assembly, the side plate assembly is connected to the periphery of the back plate main body and is surrounded by the back plate main body to form a containing space, and the backlight module is characterized by further comprising a light emitting assembly, wherein the light emitting assembly comprises a driving plate and a plurality of light emitting units, the driving plate is arranged in the containing space and is connected with the back plate main body, each light emitting unit comprises a first light emitting element, a second light emitting element, a third light emitting element and a fourth light emitting element, the first light emitting element, the second light emitting element, the third light emitting element and the fourth light emitting element are arranged on one side, opposite to the back plate main body, of the driving plate, and the driving plate is used for driving the first light emitting element, the second light emitting element, the third light emitting element and the fourth light emitting element to emit first color light, the second light emitting element is used for emitting second color light, the third light emitting element and the fourth light emitting element is used for emitting fourth color light;
The light emitting unit further comprises a light guiding element, the light guiding element comprises a light reflecting surface, a light emitting surface and a peripheral side surface, the light reflecting surface is arranged among the first light emitting element, the second light emitting element, the third light emitting element and the fourth light emitting element, the light emitting surface is arranged on one side of the light reflecting surface opposite to the driving plate and is arranged at intervals with the light reflecting surface, the peripheral side surface is connected between the light reflecting surface and the light emitting surface and covers the first light emitting element, the second light emitting element, the third light emitting element and the fourth light emitting element, the peripheral side surface is used for refracting the first color light, the second color light, the third color light and the fourth color light to the light reflecting surface to form colored backlight, and the light reflecting surface is used for reflecting the colored backlight to the light emitting surface.
2. The backlight module according to claim 1, wherein the first light emitting element is disposed opposite to the fourth light emitting element, the second light emitting element is disposed opposite to the third light emitting element, and a line connecting the first light emitting element and the fourth light emitting element intersects a line connecting the second light emitting element and the third light emitting element.
3. The backlight module according to claim 1, wherein an included angle between the peripheral side surface and a normal line of the light reflecting surface is 40 degrees to 65 degrees.
4. The backlight module according to claim 1, wherein the light emitting unit further comprises a plurality of reflective elements, wherein the reflective elements are disposed on a side of the first light emitting element, the second light emitting element, the third light emitting element, and the fourth light emitting element facing away from the driving plate, and an end of the reflective elements facing away from the driving plate is inclined inward, and the reflective elements are respectively configured to reflect the first color light, the second color light, the third color light, and the fourth color light to the peripheral side surface.
5. The backlight module according to claim 1, wherein the light emitting unit further comprises a first light transmitting sheet, a second light transmitting sheet, a third light transmitting sheet and a fourth light transmitting sheet disposed on the peripheral side surface, wherein the first light transmitting sheet is positioned corresponding to the first light emitting element, the second light transmitting sheet is positioned corresponding to the second light emitting element, the third light transmitting sheet is positioned corresponding to the third light emitting element, the fourth light transmitting sheet is positioned corresponding to the fourth light emitting element, the first light transmitting sheet is configured to transmit the first color light, and block the second color light, the third color light and the fourth color light, the second light transmitting sheet is configured to transmit the second color light, and block the first color light, the third color light and the fourth color light, the third light transmitting sheet is configured to transmit the third color light, and block the first color light, the second color light and the fourth color light, and the fourth color light transmitting sheet is configured to block the first color light, the fourth color light and the fourth color light.
6. The backlight module according to any one of claims 1 to 5, further comprising a light shielding layer disposed between adjacent ones of the light emitting units, the light shielding layer being for shielding light.
7. The backlight module according to any one of claims 1 to 5, wherein the driving board comprises a plurality of control units, the control units are electrically connected with at least one of the light emitting units, and the control units are used for receiving color signals and brightness signals, controlling the light emitting units to emit the backlight of the corresponding color according to the color signals, and controlling the light emitting units to emit the backlight of the corresponding brightness according to the brightness signals.
8. A display device, comprising a display panel and a backlight module according to any one of claims 1-7, wherein the display panel is disposed on a light emitting side of the backlight module.
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