CN111077699A - Backlight module and display device - Google Patents
Backlight module and display device Download PDFInfo
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- CN111077699A CN111077699A CN201911320433.4A CN201911320433A CN111077699A CN 111077699 A CN111077699 A CN 111077699A CN 201911320433 A CN201911320433 A CN 201911320433A CN 111077699 A CN111077699 A CN 111077699A
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- backlight
- guide plate
- light guide
- blue light
- backlight source
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Images
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
- G02F1/133615—Edge-illuminating devices, i.e. illuminating from the side
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
- G02B6/0023—Means for improving the coupling-in of light from the light source into the light guide provided by one optical element, or plurality thereof, placed between the light guide and the light source, or around the light source
- G02B6/0026—Wavelength selective element, sheet or layer, e.g. filter or grating
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
- G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
- G02B6/0081—Mechanical or electrical aspects of the light guide and light source in the lighting device peculiar to the adaptation to planar light guides, e.g. concerning packaging
- G02B6/0083—Details of electrical connections of light sources to drivers, circuit boards, or the like
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/3406—Control of illumination source
- G09G3/3413—Details of control of colour illumination sources
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Nonlinear Science (AREA)
- Engineering & Computer Science (AREA)
- Mathematical Physics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Computer Hardware Design (AREA)
- Theoretical Computer Science (AREA)
- Planar Illumination Modules (AREA)
Abstract
The invention discloses a backlight source module and a display device, wherein the backlight source module comprises: a back plate; the light guide plate is fixed on the back plate; the printed circuit board substrate is arranged on two sides of the light guide plate in parallel; the first backlight source is arranged on the printed circuit board substrate on one side of the light guide plate; the second backlight source is arranged on the printed circuit board substrate on the other side of the light guide plate; the first backlight source and the second backlight source are arranged asymmetrically, and a blue light filter film is arranged between the second backlight source and the light guide plate. According to the invention, the blue light filter film is added between the second backlight source and the light guide plate, and the independent drive control circuit is adopted for different backlight sources, so that the average proportion and the brightness of blue light components can be greatly reduced on the premise of ensuring the brightness, part of blue light is filtered, and the purposes of energy conservation, cost reduction and healthy display are achieved on the premise of ensuring the display effect.
Description
Technical Field
The invention relates to the technical field of display, in particular to a backlight source module and a display device.
Background
In recent years, the rapid improvement of the Display effect of a Liquid Crystal Display (LCD) is attributed to the rapid innovation of the backlight technology, and the LCD backlight has been developed from a Cold Cathode Fluorescent Lamp (CCFL) backlight to a Light Emitting Diode (LED) backlight which is the mainstream at present and then to a quantum dot backlight technology. With the development of backlight technology, the LCD display realizes qualitative leap from contrast to color, but while the backlight technology is rapidly developed, the blue light problem of the backlight gradually draws attention of people, and for the LED chip for the backlight, a blue light chip plus yellow light fluorescent powder is mostly adopted to obtain white light, or white light is obtained by mixing red, green and blue LEDs, so the proportion of blue light components is very large, and the following problems exist:
(1) if exposed to blue light for a long period of time, macular degeneration and other irreversible eye diseases of the human eye are likely to occur.
(2) The mode of traditional anti blue light is mostly through the drive mode of turning down the blue light proportion, perhaps increases the mode of blue light filter membrane outside the display screen, and these two kinds of modes can all make to show that the color distortion or luminance are dark even make bad display effects such as contrast decline.
To sum up, the existing backlight module has the defect that the proportion of blue light components is too high, and the blue light resisting mode adopted aiming at the defect has the technical problems of poor display effects such as color distortion or dark brightness of the display device, even contrast reduction and the like.
Disclosure of Invention
The embodiment of the invention provides a display panel and a display device, and aims to solve the technical problems of poor display effects of color distortion, dark brightness, even contrast reduction and the like of the display device in the existing blue light resisting mode.
In order to solve the above problem, in a first aspect, the present invention provides a backlight module, including:
a back plate;
the light guide plate is fixed on the back plate;
the printed circuit board substrate is arranged on two sides of the light guide plate in parallel;
the first backlight source is arranged on the printed circuit board substrate on one side of the light guide plate; and
the second backlight source is arranged on the printed circuit board substrate on the other side of the light guide plate;
the first backlight source and the second backlight source are arranged asymmetrically, and a blue light filter film is arranged between the second backlight source and the light guide plate.
In some embodiments of the present invention, the first backlight source is composed of an array of red LED chips and an array of green LED chips alternately, and the second backlight source is composed of an array of a plurality of blue LED chips.
In some embodiments of the present invention, the display device further includes a first driver and a second driver, the first driver is electrically connected to the first backlight, and the second driver is electrically connected to the second backlight.
In some embodiments of the present invention, the substrate of the blue light filter is polyethylene terephthalate with a thickness of 200um to 400 um.
In some embodiments of the present invention, the display device further comprises a blue light compensation brightness enhancement film disposed between the blue light filter film and the light guide plate, wherein a substrate of the blue light compensation brightness enhancement film is polyethylene terephthalate or polycarbonate, and the thickness of the blue light compensation brightness enhancement film is 200um to 300 um.
In some embodiments of the present invention, the blue light compensating brightness enhancement film is a thin film provided with microstructures having a triangular or semicircular cross-sectional shape.
In some embodiments of the present invention, a diffusion film and a brightness enhancement film are further included and disposed above the light guide plate.
In some embodiments of the present invention, the printed circuit board further includes an aluminum substrate and a thermal grease layer, the printed circuit board substrate is fixed on the aluminum substrate, and the thermal grease layer is bonded between the printed circuit board and the aluminum substrate.
In some embodiments of the present invention, the substrate of the light guide plate is polymethyl methacrylate, and the back plate is a diffuse reflection back plate.
In a second aspect, the present invention further provides a display device, including the backlight module described above.
Compared with the existing backlight module, the invention has the advantages that the blue light filter film is added between the second backlight and the light guide plate, and the independent drive control circuit is adopted for different backlights, so that the average proportion and the brightness of blue light components can be greatly reduced on the premise of ensuring the brightness, part of blue light is filtered, and the purposes of saving energy, reducing cost and realizing healthy display on the premise of ensuring the display effect are achieved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, 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 structural diagram of a backlight module according to an embodiment of the disclosure;
fig. 2 is a schematic structural diagram of a first backlight and a second backlight according to an embodiment of the invention.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. 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 invention.
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. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
The existing backlight module has the defect that the proportion of blue light components is too high, and the blue light resisting mode adopted aiming at the defect has the technical problems of poor display effects such as color distortion or dark brightness of the display device, even contrast reduction and the like.
Accordingly, the embodiment of the invention provides a backlight module and a display device. The following are detailed below.
First, an embodiment of the invention provides a backlight module, as shown in fig. 1, which is a schematic structural diagram of the backlight module in an embodiment of the invention. The backlight module includes: a back plate 109; a light guide plate 110 fixed on the back plate 109; a printed circuit board substrate 104 disposed in parallel on both sides of the light guide plate 110; a first backlight source disposed on the printed circuit board substrate on one side of the light guide plate 110; a second backlight source disposed on the printed circuit board substrate 104 on the other side of the light guide plate 110; the first backlight source and the second backlight source are arranged asymmetrically, and a blue light filter 102 is arranged between the second backlight source and the light guide plate 110.
Compared with the existing backlight module, the invention can filter part of blue light by adding the blue light filter film 102 between the second backlight and the light guide plate 110, so as to achieve the purpose of healthy display; compared with the currently common full-screen filter film, the filter film is only arranged between the second backlight source and the light guide plate 110 in the embodiment, so that the area of the used filter film is smaller, and the purpose of reducing the cost can be achieved; the blue light filter 102 in this embodiment does not affect the green light intensity and the red light intensity, so that the purpose of saving energy can be achieved.
In the above embodiment, in order to filter a part of the blue light for healthy display, and the display device may have color shift, in another embodiment of the invention, the backlight module further includes a blue light compensation brightness enhancement film 101 disposed between the blue light filter 102 and the light guide plate 110. The blue light compensating brightness enhancement film 101 may be used to mitigate the problem of brightness degradation caused by filtering.
Preferably, the blue light filter 102 is a thin film structure in which blue light filtering particles are mixed in or coated on a substrate, the blue light filtering particles are one of perylene, perylene derivatives, porphyrin derivatives, coumarin derivatives, acridine or acridine derivatives, and the substrate is Polyethylene terephthalate (PET) and has a thickness of 200-400 um.
Preferably, the substrate of the blue light compensation brightness enhancement film 101 is polyethylene terephthalate or Polycarbonate (PC), and the thickness is 200um to 300 um. The blue light compensation brightness enhancement film 101 is a thin film provided with a microstructure, and the cross section of the microstructure is triangular or semicircular. The plurality of microstructures are disposed on a side of the blue light compensation brightness enhancement film 101 facing the second backlight, and have a light condensing and collimating effect, so as to condense and guide the partially filtered residual blue light into the light guide plate 110, thereby achieving a purpose of increasing brightness.
In another embodiment of the present invention, the backlight module further includes a diffusion film 111 and a brightness enhancement film 112 disposed above the light guide plate 110. The base material of the diffusion film 111 is polyethylene terephthalate, light emitted by the light source assembly penetrates through the diffusion film 111, so that the light radiation area is increased, but the light intensity of a unit area is reduced, the light source assembly can be changed into a light source with larger area, good uniformity and stable brightness, and the brightness enhancement film 112 refers to the blue light compensation brightness enhancement film 101 in the same way, and is not described herein again.
In another embodiment, the backlight module further includes an aluminum substrate 105 and a heat conductive silicone layer, the printed circuit board substrate 104 is fixed on the aluminum substrate 105, and the heat conductive silicone layer is bonded between the printed circuit board 104 and the aluminum substrate 105. There are many fixing manners between the printed circuit board substrate 104 and the aluminum substrate 105, in this embodiment, one side surface of the printed circuit board 104, which is far away from the second backlight source, is bonded to one side surface of the heat-conducting silicone layer, and the other side surface of the heat-conducting silicone layer is bonded to the aluminum substrate 105, so as to achieve the purposes of fixing, reducing thermal resistance and increasing heat dissipation.
In another embodiment, the substrate of the light guide plate 110 is polymethyl methacrylate (PMMA), and the back plate 109 is a diffuse reflection back plate. The diffuse reflection backboard is beneficial to improving the diffuse reflection efficiency, so that the light is more uniform, and a larger light emitting area is obtained. The optical elements are fixed together through a fixing frame 8 to form the backlight module.
Fig. 2 is a schematic structural diagram of a first backlight and a second backlight according to an embodiment of the present invention. The first backlight source is arranged on one side of the light guide plate 110, for example, on the printed circuit board substrate on the left side, and the LED chips in the first backlight source are the green LED chips 106 and the red LED chips 107 which are alternately arranged; the second backlight source is disposed on the other side of the light guide plate 110 opposite to the light guide plate, for example, on the printed circuit board substrate 104 on the right side, and the LED chips in the second backlight source are the blue LED chips 103 arranged in an array. As can be seen from fig. 1, the light guide plate 110 is disposed between the first backlight and the second backlight, and the light guide plate 110 receives light from two sides, couples and transmits the light, and then mixes the light to obtain uniform white light.
The backlight module further comprises a first driver and a second driver, the first driver is electrically connected with the first backlight, and the second driver is electrically connected with the second backlight. In other words, the green LED chip 106 and the red LED chip 107 are controlled by the first driver, and the blue LED chip 103 is controlled by the second driver, so that in the process of adjusting the intensity of the blue light emitted by the blue LED chip 103, the intensity of the green light emitted by the green LED chip 106 and the intensity of the red light emitted by the red LED chip 107 can be kept unchanged or adjusted in different amplitudes and directions, and as can be seen from the same principle, in the process of adjusting the intensity of the green light emitted by the green LED chip 106 and the intensity of the red light emitted by the red LED chip 107, the intensity of the blue light emitted by the blue LED chip 103 can be kept unchanged or adjusted in different amplitudes and directions.
The asymmetric arrangement of the first backlight source and the second backlight source is embodied in different arrangement modes of the LED chips and different driving power supplies.
In actual use, the mode of independent control of the first backlight source and the second backlight source can be flexibly regulated according to the actual requirements of viewers, and the blue light intensity can also be regulated according to the chromaticity information of actual display pictures. When the actual display picture is mainly red and green light, on the premise of ensuring the display brightness, the first driver controls the intensity of green light emitted by the green light LED chip 106 and the intensity of red light emitted by the red light LED chip 107 to be greatly increased, or the second driver controls the intensity of blue light emitted by the LED blue light chip 103 to be greatly reduced, or the two measures are carried out simultaneously, so that the purpose of reducing the proportion and the intensity of the blue light in the mixed light is achieved. When the actual display picture is mainly blue light, the first driver controls the intensity of green light emitted by the green light LED chip 106 and the intensity of red light emitted by the red light LED chip 107 to be properly reduced, or the second driver controls the intensity of blue light emitted by the LED blue light chip 103 to be properly increased, or the two measures are carried out simultaneously, so that the purpose of properly improving the proportion and the intensity of blue light in mixed light is achieved. This can result in a substantial reduction in the average amount of blue light that an observer will contact over the entire observation period.
In order to better implement the backlight module in the embodiments of the present invention, on the basis of the backlight module, the embodiments of the present invention further provide a display device, where the display device includes the backlight module as described in the embodiments above. By adopting the backlight module described in the above embodiments, the performance of the display device is further improved.
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 above embodiments of the present invention are described in detail, and the principle and the implementation of the present invention are explained by applying specific embodiments, and the description of the above embodiments is only used to help understanding the technical scheme and the core idea of the present invention; those of ordinary skill in the art will understand that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A backlight module, comprising:
a back plate;
the light guide plate is fixed on the back plate;
the printed circuit board substrate is arranged on two sides of the light guide plate in parallel;
the first backlight source is arranged on the printed circuit board substrate on one side of the light guide plate; and
the second backlight source is arranged on the printed circuit board substrate on the other side of the light guide plate;
the first backlight source and the second backlight source are arranged asymmetrically, and a blue light filter film is arranged between the second backlight source and the light guide plate.
2. The backlight module of claim 1, wherein the first backlight source is composed of an array of red LED chips and an array of green LED chips alternately, and the second backlight source is composed of an array of a plurality of blue LED chips.
3. The backlight module of claim 1, further comprising a first driver and a second driver, wherein the first driver is electrically connected to the first backlight and the second driver is electrically connected to the second backlight.
4. The backlight module of claim 1, wherein the substrate of the blue light filter is polyethylene terephthalate with a thickness of 200um to 400 um.
5. The backlight module of claim 2, further comprising a blue light compensation brightness enhancement film disposed between the blue light filter and the light guide plate, wherein the substrate of the blue light compensation brightness enhancement film is polyethylene terephthalate or polycarbonate, and the thickness of the blue light compensation brightness enhancement film is 200-300 um.
6. The backlight module as claimed in claim 2, wherein the blue light compensating brightness enhancement film is a film provided with microstructures, and the microstructures have a triangular or semicircular cross-sectional shape.
7. The backlight module of claim 1, further comprising a diffuser film and a brightness enhancement film disposed over the light guide plate.
8. The backlight module of claim 1, further comprising an aluminum substrate and a thermal grease layer, wherein the printed circuit board is fixed on the aluminum substrate, and the thermal grease layer is bonded between the printed circuit board and the aluminum substrate.
9. The backlight module of claim 1, wherein the substrate of the light guide plate is polymethyl methacrylate, and the back plate is a diffuse reflection back plate.
10. A display device comprising the backlight module according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911320433.4A CN111077699A (en) | 2019-12-19 | 2019-12-19 | Backlight module and display device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911320433.4A CN111077699A (en) | 2019-12-19 | 2019-12-19 | Backlight module and display device |
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| CN111077699A true CN111077699A (en) | 2020-04-28 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113889052A (en) * | 2020-07-01 | 2022-01-04 | 周卓煇 | Display with blue light filtering function |
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| CN104456282A (en) * | 2013-09-16 | 2015-03-25 | 三星显示有限公司 | Backlight assembly and display including the same |
| CN105700235A (en) * | 2016-04-13 | 2016-06-22 | 京东方科技集团股份有限公司 | Backlight module and display device |
| CN106772761A (en) * | 2016-12-27 | 2017-05-31 | 广东晶科电子股份有限公司 | A kind of colour gamut side entering-type LED backlight module high |
| CN207298530U (en) * | 2017-04-20 | 2018-05-01 | 广东小天才科技有限公司 | LED backlight assembly and display device thereof |
| CN110082955A (en) * | 2019-03-18 | 2019-08-02 | 东莞市托普莱斯光电技术有限公司 | Anti-blue-light backlight module |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113889052A (en) * | 2020-07-01 | 2022-01-04 | 周卓煇 | Display with blue light filtering function |
| CN113889052B (en) * | 2020-07-01 | 2023-03-28 | 周卓煇 | Display with blue light filtering function |
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