CN111123581A - Direct type backlight device and display equipment - Google Patents
Direct type backlight device and display equipment Download PDFInfo
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- CN111123581A CN111123581A CN201911372592.9A CN201911372592A CN111123581A CN 111123581 A CN111123581 A CN 111123581A CN 201911372592 A CN201911372592 A CN 201911372592A CN 111123581 A CN111123581 A CN 111123581A
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- quantum dot
- diffusion film
- backlight device
- dot diffusion
- direct type
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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
- G02F1/133603—Direct backlight with LEDs
-
- 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
- G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
-
- 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
- G02F1/133614—Illuminating devices using photoluminescence, e.g. phosphors illuminated by UV or blue light
Abstract
The invention discloses a direct type backlight device which comprises a plurality of blue light LED light sources, a PCB (printed Circuit Board) driving board, a reflector plate and a quantum dot diffusion film. Electrically mounting a plurality of blue LED light sources on the PCB driving board; the reflector plate is arranged on the PCB driving board; the quantum dot diffusion film is arranged above the blue LED light source. The quantum dot diffusion film comprises a high-diffusivity structure which is arranged on the light incident surface of the quantum dot diffusion film. The invention provides a backlight device for improving uniform light emission of a surface light source, which improves the utilization efficiency of light and simultaneously provides a display device which is ultrathin, wide in color gamut and high in dynamic contrast.
Description
Technical Field
The present disclosure relates to display devices, and particularly to a direct-type backlight device and a display apparatus.
Background
The liquid crystal panel of the liquid crystal display device does not emit light by itself. Therefore, the liquid crystal display device is provided with a backlight device as a surface light source device as a light source for illuminating the liquid crystal panel on the back side of the liquid crystal panel.
As a configuration of such a backlight device, a direct type backlight device in which a plurality of Light emitting diodes (hereinafter, referred to as "LED elements") are arranged is known.
In recent years, a small-sized LED element having high efficiency and high output has been developed. Therefore, even if the number of LED elements or LED BARs used in the backlight device is reduced, theoretically the same luminance as that of the conventional one can be obtained. In addition, the LED BAR is formed by arranging a plurality of LED elements to form 1 electronic component.
For example, patent documents 1 and 2 disclose the following techniques: in order to constitute a backlight device which is inexpensive and can obtain uniform luminance, light emitted from LED elements is diffused by cylindrical lenses.
Prior art patent document 1: japanese patent laid-open publication No. 2006-286608 patent document 2: however, in the techniques described in patent documents 1 and 2, when light is transmitted from a medium of a cylindrical lens into the air, reflected light is generated inside the cylindrical lens which is a boundary surface of the cylindrical lens. Further, the more the divergence angle of light from the LED element is enlarged, the more the reflected light increases. Therefore, it is difficult to improve uniformity of light irradiated in a planar manner. In particular, it is difficult to suppress a decrease in the light amount around the irradiation region.
On the other hand, with the development of ultra-thin liquid crystal display electronic products and the realization of High-Dynamic contrast (HDR), higher requirements are also put forward on the thickness of the backlight module of the liquid crystal display. In each optical film of the backlight module, the diffusion sheet is a main film which determines the thickness of the backlight module, and on one hand, the phenomena of film arching and wrinkling can occur when the thickness of the diffusion sheet is too thin, so that the display effect is influenced; on the other hand, if the diffusion film is not provided, the LED is a point light source, and problems such as halation, glare, and eye may occur at the base of the lamp, and thus uniform display cannot be performed.
Disclosure of Invention
The invention mainly solves the technical problem of providing a backlight device for improving the uniform light emission of a surface light source, improving the utilization efficiency of light, and simultaneously providing a display device which is ultrathin, wide in color gamut and high in dynamic contrast.
In order to solve the above technical problems, one technical solution adopted by the present invention is to provide a direct type backlight device, which includes a plurality of blue LED light sources, a PCB driving board, a reflective sheet, and a quantum dot diffusion film. Electrically mounting a plurality of blue LED light sources on the PCB driving board; the reflector plate is arranged on the PCB driving board; the quantum dot diffusion film is arranged above the blue LED light source. The quantum dot diffusion film comprises a high-diffusivity structure which is arranged on the light incident surface of the quantum dot diffusion film.
According to the backlight device, a diffusion sheet does not need to be independently arranged, and the quantum dot diffusion film replaces the light emitting uniformity of a surface light source of the backlight module, so that the ultra-thin backlight module and the display equipment are realized, and the display picture with the high HDR contrast value and the wide color gamut of the terminal equipment is obtained. In addition, the production, assembly process and structure of the whole backlight module are simpler, and the structural stability is high. The quantum dot diffusion film comprises at least two quantum dots of red fluorescent quantum dots, green fluorescent quantum dots and yellow fluorescent quantum dots. The narrow light-emitting peak and high quantum efficiency of the quantum dots greatly improve the picture color quality and energy efficiency of the display equipment. The quantum dot diffusion film comprises at least one quantum dot of CdSe, CdS, CuInS, CdZnSe/ZnS, CdSe/CdS, InP/ZnS, CuInS/ZnS, InP/ZnSe/ZnS and perovskite quantum dots.
In a preferred embodiment, the high diffusivity structure is integrally formed on the quantum dot diffusion film; or the high-diffusivity structure is connected with the quantum dot diffusion film in a split mode.
In a preferred embodiment, the high diffusivity structures radiate outwardly from each blue LED light source.
In a preferred embodiment, the high diffusivity structure is a concave lens structure or a convex lens structure, which is a hemispherical structure, a tetrahedral structure, a polyhedral structure, a cylindrical structure or a near-conical structure.
In a preferred embodiment, the quantum dot diffusion film further includes a high-reflectivity structure disposed on the light-emitting surface of the quantum dot diffusion film, and the high-reflectivity structure is radially distributed, and the density of the high-reflectivity structure is gradually decreased from each blue LED light source to the outside.
In a preferred embodiment, the quantum dot diffusion film further includes visible light diffusion particles including at least one of particles of SiO2, TiO2, Au, Ag, Al, Cu, Zn, Pt, Co, Ni, Cu2O, CuO, CdO, ZnO, glass fiber.
In a preferred embodiment, the reflector plate has a plurality of openings, each opening corresponds to a corresponding blue LED light source, light emitted by the blue LED light source passes through the opening on the reflector plate to irradiate the quantum dot diffusion film, and the light reflected or scattered by the quantum dot diffusion film is reflected to the quantum dot diffusion film after returning to the reflector plate; the blue LED light source comprises at least one of a mini LED, a Micro LED, an OLED or a conventional LED chip.
According to the embodiment of the present invention, the direct type backlight device of the present invention is integrated with the LCD panel and the glass cover plate into an electronic apparatus, which can be applied to an LCD display.
Drawings
The invention and its advantages will be better understood by studying the following detailed description of specific embodiments, given by way of non-limiting example, and illustrated in the accompanying drawings, in which:
fig. 1 is an exploded view of a backlight device of embodiment 1 of the present invention.
Fig. 2 is a schematic structural view of a quantum dot diffusion film of embodiment 1 of the present invention.
Fig. 3 is a schematic structural view of a quantum dot diffusion film of embodiment 2 of the present invention.
Detailed Description
Referring to the drawings, wherein like reference numbers refer to like elements throughout, the principles of the present invention are illustrated in an appropriate environment. The following description is based on illustrated embodiments of the invention and should not be taken as limiting the invention with regard to other embodiments that are not detailed herein.
The word "embodiment" is used herein to mean serving as an example, instance, or illustration. In addition, the articles "a" and "an" as used in this specification and the appended claims may generally be construed to mean "one or more" unless specified otherwise or clear from context to be directed to a singular form.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Further, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact of the first and second features, or may comprise direct contact of the first and second features through another feature in between. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or meaning that the first feature is at a lesser elevation than the second feature.
The following disclosure provides many different embodiments or examples for implementing different features of the invention. To simplify the disclosure of the present invention, the components and arrangements of specific examples are described below. Of course, they are merely examples and are not intended to limit the present invention. Furthermore, the present invention may repeat reference numerals and/or letters in the various examples, such repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. In addition, the present invention provides examples of various specific processes and materials, but one of ordinary skill in the art may recognize applications of other processes and/or uses of other materials.
Example 1
First, a direct type backlight device according to embodiment 1 of the present invention will be described with reference to fig. 1. One technical solution adopted in this embodiment is to provide a direct type backlight device, which includes a PCB driving board 10, a plurality of blue LED light sources 11, a reflective sheet 12, and a quantum dot diffusion film 13. Electrically mounting a plurality of the blue LED light sources 11 on the PCB driving board 10; the reflector plate is arranged on the PCB driving board; a quantum dot diffusion film 13 is disposed above the blue LED light source 11. The quantum dot diffusion film 13 includes a high diffusivity structure 131, which is disposed on the light incident surface of the quantum dot diffusion film 13, that is, the surface close to the blue LED light source 11.
The backlight device of the embodiment does not need to be separately provided with a diffusion sheet, and the quantum dot diffusion film 13 replaces the light emitting uniformity of a surface light source of the backlight module, so that the ultra-thin backlight module and the ultra-thin display equipment are realized, and the display picture with high HDR contrast value and wide color gamut of the terminal equipment is obtained. In addition, the production, assembly process and structure of the whole backlight module are simpler, and the structural stability is high. The quantum dot diffusion film 13 includes at least two kinds of quantum dots among red fluorescent quantum dots, green fluorescent quantum dots, and yellow fluorescent quantum dots. The narrow light-emitting peak and high quantum efficiency of the quantum dots greatly improve the picture color quality and energy efficiency of the display equipment. The quantum dot diffusion film 13 includes at least one quantum dot of CdSe, CdS, CuInS, CdZnSe/ZnS, CdSe/CdS, InP/ZnS, CuInS/ZnS, InP/ZnSe/ZnS, and perovskite quantum dots.
The high diffusivity structure 131 is integrally formed on the quantum dot diffusion film 13. The high diffusivity structures 131 are radially distributed with a density that decreases from each blue LED light source 11. The high diffusivity structure 131 is a concave lens structure, which is a hemispherical structure.
In a preferred embodiment, the quantum dot diffusion film 13 further includes visible light diffusing particles including SiO2 particles having a hollow structure.
The reflector plate is provided with a plurality of openings 121, each opening 121 corresponds to a corresponding blue light LED light source 11, light emitted by the blue light LED light sources 11 passes through the opening 121 on the reflector plate 12 to irradiate the quantum dot diffusion film 13, and the light reflected or scattered by the quantum dot diffusion film 13 returns to the reflector plate 12 and then is reflected to the quantum dot diffusion film 13, so that the light utilization efficiency is further improved, the uniform light emission of a surface light source is improved, and the blue light LED light sources 11 are mini LEDs.
Example 2
Fig. 2 is a schematic structural diagram of a direct type backlight device according to embodiment 2 of the present invention. Only the differences between embodiment 2 and embodiment 1 will be described below, and the descriptions of the similarities will be omitted.
As shown in fig. 2, the quantum dot diffusion film 13 further includes high-reflectivity structures 132 disposed on the light-emitting surface of the quantum dot diffusion film 13, wherein the high-reflectivity structures are radially distributed, and the density of the high-reflectivity structures decreases from each blue LED light source 11 to the outside.
While the invention has been described above with reference to certain embodiments, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. In particular, the various features of the various embodiments of the present disclosure may be used in any combination, provided that there is no structural conflict, and the combination is not exhaustively described in this specification for brevity and resource conservation. Therefore, it is intended that the invention not be limited to the particular embodiments disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.
Claims (10)
1. A direct type backlight device, comprising:
a plurality of blue LED light sources;
the PCB driving board is provided with a plurality of blue LED light sources electrically;
the reflector plate is arranged on the PCB driving board;
a quantum dot diffusion film disposed over the blue LED light source;
the quantum dot diffusion film comprises a high-diffusivity structure and is arranged on the light incident surface of the quantum dot diffusion film.
2. A direct type backlight device according to claim 1, wherein: the high-diffusivity structure is integrally formed on the quantum dot diffusion film; or the high-diffusivity structure is connected with the quantum dot diffusion film in a split mode.
3. A direct type backlight device according to claim 2, wherein: the high diffusivity structures are radially distributed, and the density of the high diffusivity structures is gradually reduced from each blue light LED light source outwards.
4. A direct type backlight device according to claim 3, wherein: the high-diffusivity structure is a concave lens structure or a convex lens structure, and the high-diffusivity structure is a hemispherical structure, a tetrahedral structure, a polyhedral structure, a cylindrical structure or a nearly conical structure.
5. A direct type backlight device according to claim 2, wherein: the quantum dot diffusion film also comprises high-reflectivity structures which are arranged on the light-emitting surface of the quantum dot diffusion film and are distributed in a radial shape, and the density of the high-reflectivity structures is gradually reduced from each blue light LED light source to the outside.
6. A direct type backlight device according to claim 1, wherein: the quantum dot diffusion film comprises at least two quantum dots of red fluorescent quantum dots, green fluorescent quantum dots and yellow fluorescent quantum dots.
7. A direct type backlight device according to claim 6, wherein: the quantum dot diffusion film comprises at least one quantum dot of CdSe, CdS, CuInS, CdZnSe/ZnS, CdSe/CdS, InP/ZnS, CuInS/ZnS, InP/ZnSe/ZnS and perovskite quantum dots.
8. A direct type backlight device according to claim 6, wherein: the quantum dot diffusion film also comprises visible light diffusion particles, and the visible light diffusion particles comprise at least one particle of SiO2, TiO2, Au, Ag, Al, Cu, Zn, Pt, Co, Ni, Cu2O, CuO, CdO, ZnO and glass fiber.
9. A direct type backlight device according to claim 1, wherein: the reflector plate is provided with a plurality of openings, each opening corresponds to a corresponding blue LED light source, light emitted by the blue LED light sources passes through the openings on the reflector plate to irradiate the quantum dot diffusion film, and the light reflected or scattered by the quantum dot diffusion film is reflected to the quantum dot diffusion film after returning to the reflector plate; the blue LED light source comprises at least one of miniLED, Micro LED, OLED or conventional LED chip.
10. A display apparatus, comprising: an LCD panel, a glass cover plate, and a direct type backlight device according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911372592.9A CN111123581A (en) | 2019-12-27 | 2019-12-27 | Direct type backlight device and display equipment |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911372592.9A CN111123581A (en) | 2019-12-27 | 2019-12-27 | Direct type backlight device and display equipment |
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| CN111123581A true CN111123581A (en) | 2020-05-08 |
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| CN201911372592.9A Pending CN111123581A (en) | 2019-12-27 | 2019-12-27 | Direct type backlight device and display equipment |
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Cited By (2)
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| CN112799251A (en) * | 2020-12-28 | 2021-05-14 | 深圳市隆利科技股份有限公司 | Direct type light emitting device |
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Application publication date: 20200508 |