CN112748610A - Backlight module, display device and backlight color temperature adjusting method - Google Patents
Backlight module, display device and backlight color temperature adjusting method Download PDFInfo
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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
- G02F1/133605—Direct backlight including specially adapted reflectors
-
- 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
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- Nonlinear Science (AREA)
- Mathematical Physics (AREA)
- Chemical & Material Sciences (AREA)
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- Optics & Photonics (AREA)
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Abstract
The invention discloses a backlight module, a display device and a backlight color temperature adjusting method, wherein the backlight module comprises: the backlight source is arranged on the reflector plate and used for adjusting the color temperature value and the brightness value; the backlight source and the reflector plate are arranged on the light incident side of the diffusion plate, and the optical film is arranged on the light emergent side of the diffusion plate so as to provide incident light for the display screen. According to the invention, the backlight source used for adjusting the color temperature value and the brightness value is arranged, so that the current value proportion of the LED in the backlight source can be adjusted when the color temperature value of the display device is adjusted, and the brightness of the display device is unchanged.
Description
Technical Field
The invention relates to the field of display device application, in particular to a backlight module, a display device and a backlight color temperature adjusting method.
Background
Color temperature is an important indicator of a display device, and determines a first subjective feeling of a person watching the display device; and global consumers have different preferences for color temperature, such as: asians mostly like color temperature around 9000K, and americans mostly like color temperature of D65 (6500K); in addition, when the display device is in the environments of supermarkets, large-scale stores and the like, the display device is easily influenced by various lights, and the color temperature of the display device needs to be increased so as to achieve the display effect according with the environments of supermarkets, large-scale stores and the like; when the display device is in a household use environment, the color temperature needs to be adjusted to achieve the effect of protecting eyes.
In the conventional display device, although the function of adjusting the color temperature is basically satisfied, at the beginning of the development of the display device, the display device can be designed only by referring to one color temperature value (e.g., 6500K), and if the designed color temperature value needs to be switched to another color temperature value, the white balance of the display device needs to be adjusted, so that the displayed brightness is reduced, and the display effect is also reduced.
Accordingly, the prior art is yet to be improved and developed.
Disclosure of Invention
The present invention provides a backlight module, a display device and a method for adjusting color temperature of backlight, so as to solve the technical problem of display brightness reduction when adjusting the color temperature value.
The technical scheme adopted by the invention for solving the technical problem is as follows:
in a first aspect, the present invention provides a backlight module, including: the backlight source is arranged on the reflector plate and used for adjusting the color temperature value and the brightness value; the backlight source and the reflector plate are arranged on the light incident side of the diffusion plate, and the optical film is arranged on the light emergent side of the diffusion plate so as to provide incident light for the display screen.
In a second aspect, the present invention further provides a display device, which includes a front frame, a back plate and the backlight module according to the first aspect.
The backlight module includes: the backlight source is arranged on the reflector plate and used for adjusting the color temperature value and the brightness value; the backlight source and the reflector plate are arranged on the light incident side of the diffusion plate, and the optical film is arranged on the light emergent side of the diffusion plate so as to provide incident light for the display screen.
In a third aspect, the present invention also provides a backlight color temperature adjusting method for adjusting the backlight color temperature of the display device according to the second aspect, the method comprising:
acquiring a target color temperature value, and determining corresponding adjusting parameters according to the target color temperature value;
and adjusting the color temperature value and the brightness value of the display device according to the adjusting parameters.
The invention adopts the technical scheme and has the following effects:
according to the invention, the backlight source used for adjusting the color temperature value and the brightness value is arranged, and the current value proportion of the LED in the backlight source can be adjusted when the color temperature value of the display device is adjusted, so that the brightness of the display device is unchanged, and the technical problem of reduction of the display brightness when the color temperature value is adjusted is solved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a backlight module in an implementation manner of the invention.
Fig. 2 is a schematic diagram (one) of the distribution of LEDs in a backlight according to an implementation of the present invention.
Fig. 3 is a schematic diagram (two) of the distribution of LEDs in the backlight according to an implementation manner of the present invention.
Fig. 4 is a schematic structural diagram of a display device in an implementation manner of the invention.
Fig. 5 is a flowchart illustrating a method for adjusting color temperature of a backlight according to an embodiment of the invention.
In the figure: 100. a diffusion plate; 200. an optical film; 300. a reflective sheet; 400. a backlight source; 10. a front frame; 20. a back plate; 30. a backlight module is provided.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer and clearer, the present invention is further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example one
As shown in FIGS. 1 to 3, a backlight module is provided.
As shown in fig. 1, in one implementation, a backlight module is provided, which includes: a diffusion plate 100, an optical film 200, a reflective sheet 300, and a backlight 400 disposed on the reflective sheet 300 and used for adjusting a color temperature value and a brightness value; the backlight source 400 and the reflective sheet 300 are disposed on the light incident side of the diffuser 100, and the optical film 200 is disposed on the light emitting side of the diffuser 100 to provide incident light to the display panel.
Specifically, the reflective sheet 300 includes a central light reflection region and a plurality of side light reflection regions; wherein the plurality of side light reflecting regions surround the central light reflecting region; the central light reflecting region is used for arranging the backlight 400, a plurality of side light reflecting regions are arranged around the central light reflecting region, and a certain included angle is formed between the plurality of side light reflecting regions and the central light reflecting region, so that light around the backlight 400 is reflected into the diffusion plate 100, and the display brightness of the display screen is increased.
In the present embodiment, the backlights 400 are distributed in an array in the central reflective area, and the backlights 400 distributed in the array are disposed opposite to the diffuser 100. It is understood that, in the embodiment, the central light reflecting area is located behind the diffusion plate 100, and the light on the rear side of the backlight 400 can be reflected into the diffusion plate 100 by the reflection sheet 300 of the central light reflecting area; the plurality of side light reflecting regions are respectively located around the diffusion plate 100, and light around the backlight 400 can be reflected into the diffusion plate 100 by the reflectors 300 of the plurality of side light reflecting regions, so as to improve the display brightness of the display screen.
Specifically, as shown in fig. 2, the backlight 400 distributed in an array includes: a pure color light train and a mixed light train; wherein, the pure color light columns and the mixed light columns are arranged alternately; in a solid color light train, there is only one color of LED light, for example: a white light LED lamp; in a mixed light train, at least two LED lights of different colors are used, for example: the mixed light array is formed by combining a blue light LED lamp and a white light LED lamp. By setting the alternate arrangement mode of the pure color light columns and the mixed light columns, the color gamut displayed can not be changed, and the adjustment requirement of the color temperature value can be met.
Specifically, when the mixed light columns are arranged, the white light LEDs and the blue light LEDs can be alternately arranged, and the arrangement sequence of the white light LEDs and the arrangement sequence of the blue light LEDs in two adjacent mixed light columns are different, that is, the light colors of two LED lamps in the same row in two adjacent mixed light columns are different from each other; by arranging the mixed light columns, the current value proportion of the white light LED and the current value proportion of the blue light LED can be adjusted when the displayed color temperature value is adjusted, so that the display brightness after the color temperature is adjusted is unchanged.
In this embodiment, the distribution scheme of the white LEDs and the blue LEDs of the backlight 400 is applied to a direct-type backlight module; of course, in another implementation manner, the distribution scheme of the white LEDs and the blue LEDs of the backlight 400 may also be applied to a side-in type backlight module.
In this embodiment, according to the display requirements of different color gamuts, different phosphor materials may be used as the material of the white LED, wherein in the white LED light train or the mixed light train, the white LED includes: one or more of yttrium aluminum garnet phosphor LED (YAG phosphor LED), red green phosphor LED (RG phosphor LED), red phosphor LED and quantum dot phosphor LED; and aiming at different color gamuts, the common blue light LED is adopted.
Specifically, in a backlight scheme with a common color gamut (i.e., a display color gamut greater than or equal to 63% DCI-P3), a yttrium aluminum garnet phosphor LED (i.e., YAG phosphor LED) may be selected as the white LED.
In a backlight scheme with a common high color gamut (i.e., a display color gamut greater than or equal to 80% DCI-P3), red-green phosphor LEDs (i.e., RG phosphors) may be used as the white LEDs for primary display, and YAG phosphors LEDs may be used as the white LEDs for secondary adjustment.
In a high gamut (i.e., a display gamut greater than or equal to 90% DCI-P3) backlight scheme, a new red phosphor LED may be used as the primary display white LED, and a YAG phosphor LED or an RG phosphor LED may be used as the secondary regulation white LED.
In the backlight scheme of quantum dot high color gamut (i.e., display color gamut greater than or equal to 95% DCI-P3), blue LEDs are used as the primary light source for exciting the quantum dot material.
In this embodiment, as shown in fig. 3, when the pure color light columns are blue LED light columns, the diffuser plate 100 is a diffuser plate made of quantum dot material, or the optical film 200 is an optical film made of quantum dot material, or the diffuser plate 100 is a composite quantum dot diffuser plate; the blue LED is used as a backlight light source for main display and is used for exciting the quantum dot material to generate mixed white light; in the composite type quantum dot diffusion plate, the product is a composite product of the diffusion plate and the optical film, and the quantum dot material can be located in the diffusion plate or the optical film.
In this embodiment, the quantum dot material may be an inorganic quantum dot, a perovskite quantum dot, an organic-inorganic hybrid quantum dot, or the like. Among them, inorganic quantum dots are mainly group II-VI, group III-V system quantum dots, such as CdE (E ═ S/Se/Te) quantum dots, indium phosphide quantum dots, indium arsenide quantum dots, gallium arsenide quantum dots, and the like; in addition, there are other systems of quantum dots, such as: zinc sulfide quantum dots, zinc selenide quantum dots, and the like.
A novel hybrid perovskite quantum dot material is characterized in that an inner core is formed by R1NH3AB3 or (R2NH3)2AB4, R1 is methyl, R2 is an organic molecular group, A is one or more selected from Ge, Sn, Pb, Sb, Bi, Cu or Mn, B is one or more selected from Cl, Br and I, A and B form a coordination octahedral structure, R1NH3 or R2NH3 is filled in gaps of the coordination octahedral structure, and a surface ligand is organic acid or organic amine.
The quantum yield of the hybrid quantum dot material is very high, the half-peak width is narrower, and the luminescent color purity is higher; the organic-inorganic hybrid perovskite material combines the advantages of organic and inorganic materials, so that the organic-inorganic hybrid perovskite material has the advantages of good thermal stability, mechanical property and electromagnetic property of inorganic components, easy processing and film formation of organic components and the like, and the preparation process is relatively simple; therefore, the perovskite material has great advantages when being applied to backlight, not only can high color gamut be realized, but also the backlight cost can be greatly reduced; similar perovskite materials are also inorganic perovskite and inorganic-organic hybrid perovskite materials, which have chemical formulas mainly of inorganic perovskite CsPbX3(x ═ Cl/Br/I) and organic-inorganic hybrid perovskite materials CH3NH3PbX3(x ═ Cl/Br/I), CH3NH3PbX3(x ═ Cl/Br/I).
In this embodiment, when the displayed color temperature value needs to be adjusted, the displayed color temperature value is adjusted by controlling the current values of the white light LED and the blue light LED, so as to meet the requirement of the color temperature value; and when the reduction of the display brightness is detected, the current value proportion of the white light LED and the current value proportion of the blue light LED are adjusted, so that the display brightness value is kept unchanged.
In this embodiment, when the distribution scheme of the white LEDs and the blue LEDs of the backlight 400 is applied to a backlight module with a common color gamut (i.e. a backlight module using YAG phosphor LEDs), the color temperature value and the brightness value are adjusted as follows:
as shown in fig. 2, the backlight source adopts a mixed light source of a blue LED and a white LED, wherein the white LED adopts a YAG phosphor white LED; the blue light LED and the YAG fluorescent powder white light LED are independently controlled; the YAG phosphor white light LED can be used for realizing the color temperature value of a low color temperature region by controlling, for example: 6500K; and by controlling the blue light LED and the YAG phosphor white light LED, the color temperature value of a high color temperature area can be realized, for example: 10000K.
When a backlight light source is set, determining the parameter specifications of the YAG fluorescent powder white light LED and the blue light LED, such as the brightness value, the chromatic value and the current value of a lamp bead, according to the requirement of initial brightness; specifically, the displayed color temperature value is adjusted to 6500K, and when the displayed color temperature value is 6500K, the current of all the blue LEDs is set to 0A, so that the brightness value, the chromaticity value and the current value of the YAG phosphor white LED at 6500K can be determined sequentially.
When the color temperature value needs to be adjusted, for example, the color temperature value is adjusted from 6500K to 8000K; lightening a YAG fluorescent powder white light LED and a blue light LED, and simultaneously adjusting the current of the blue light LED to enable the displayed color temperature value to reach 8000K; in the process of adjusting the color temperature value, if the brightness value is detected to be reduced, the current value proportion of the blue light LED and the current value proportion of the YAG fluorescent powder white light LED are adjusted at the same time, so that the color temperature value of the liquid crystal display screen is 8000K, and the displayed brightness value is unchanged; when the color temperature value is adjusted to 10000K, the adjustment mode is the same as the adjustment mode of 8000K.
In this embodiment, when the distribution scheme of the white LEDs and the blue LEDs of the backlight 400 is applied to a common high color gamut backlight module (i.e., a backlight module using RG phosphor LEDs) or a high color gamut backlight module (i.e., a backlight module using new red phosphor LEDs), the adjustment modes of the color temperature value and the brightness value are as follows:
adopting a new red powder LED/RG fluorescent powder LED as a white light LED for main display; meanwhile, a white light LED provided with a YAG fluorescent powder material and a blue light LED are additionally arranged, and the blue light LED and the YAG fluorescent powder white light LED are additionally arranged for auxiliary adjustment; the layout mode of the new red powder LED/RG fluorescent powder white light LED, YAG fluorescent powder white light LED and blue light LED can adopt the distribution mode; specifically, according to the requirement of the initial color temperature value (for example, the initial color temperature value is 6500K), the brightness value, the chromatic value and the current value of the new red LED/RG phosphor white LED are determined, and the new red LED/RG phosphor white LED is lighted.
When the color temperature value needs to be adjusted, for example, the color temperature value is adjusted from 6500K to 8000K; on the premise of lighting the new red powder LED/RG fluorescent powder LED, lighting the YAG fluorescent powder white LED and the blue LED to enable the displayed color temperature value to reach 8000K; in the process of adjusting the color temperature value, if the brightness value is detected to be reduced, the current value proportion of the blue light LED and the current value proportion of the YAG fluorescent powder white light LED are adjusted at the same time, so that the color temperature value of the liquid crystal display screen is 8000K, and the displayed brightness value is unchanged; at this time, the current value of the new red LED/RG phosphor white LED is unchanged compared to the initial color temperature value.
In this embodiment, when the distribution scheme of the white light LEDs and the blue light LEDs of the backlight 400 is applied to a backlight module with a high quantum dot color gamut, the adjustment modes of the color temperature value and the brightness value are as follows:
aiming at the backlight module with ultrahigh color gamut (namely the backlight module adopting quantum dots), a blue light LED is mainly adopted for adjustment, and a white light LED made of quantum dot fluorescent powder material is used for auxiliary adjustment; as shown in fig. 3, the backlight light sources are arranged in a layout manner in which the pure color light columns and the mixed light columns are alternately arranged; it is understood that fig. 3 is a white LED obtained by replacing the white LED in fig. 2 with a blue LED, and replacing the blue LED in fig. 2 with a quantum dot phosphor material.
Because, the backlight module is a quantum dot backlight scheme; therefore, a quantum dot optical film needs to be arranged in the optical film 200, or the diffusion plate 100 needs to be arranged as a quantum dot diffusion plate, or a composite type quantum dot diffusion plate is adopted, and a quantum dot material is excited by a blue light LED to generate three colors of red, green and blue, so that white light is generated by mixing; when the quantum dots are used as materials, white light is generated through excitation of a blue LED; therefore, the blue light LED is a main adjusting point, and the white light LED made of the quantum dot fluorescent powder material is an auxiliary adjusting point.
According to the requirement of an initial color temperature value (for example, the initial color temperature value is 6500K), the blue LED is lightened, the current of the white LED of the quantum dot fluorescent powder material is set to be 0A, and the current value of the blue LED is determined according to the displayed brightness value and the color temperature value requirement.
When the color temperature value needs to be adjusted, for example, the color temperature value is adjusted from 6500K to 8000K; under the condition of lightening the blue LED, lightening the white LED of the quantum dot fluorescent powder material, and adjusting the current value proportion of the blue LED and the current value proportion of the white LED of the quantum dot fluorescent powder material to enable the color temperature value of the white LED passing through the liquid crystal display screen to be 8000K and the displayed brightness value to be unchanged.
In the embodiment, by changing the layout mode of the blue light LED and the white light LED in the backlight light source, the display device can perform auxiliary adjustment by using the blue light LED and the white light LED when adjusting the display color temperature value, so as to meet the required color temperature value requirement; and the brightness value of the display can be kept unchanged by adjusting the current value proportion of the blue light LED and the current value proportion of the white light LED.
Example two
As shown in fig. 1 to 4, a display device is provided according to the above embodiments.
As shown in fig. 4, a display device is provided, which includes a front frame 10, a back plate 20 and a backlight module 30 according to a first embodiment;
as shown in fig. 1 to 3, a backlight module 30 is provided, which includes: a diffusion plate 100, an optical film 200, a reflective sheet 300, and a backlight 400 disposed on the reflective sheet 300 and used for adjusting a color temperature value and a brightness value; the backlight source 400 and the reflective sheet 300 are disposed on the light incident side of the diffuser plate 100, and the optical film 200 is disposed on the light emitting side of the diffuser plate 100 to provide incident light to the display screen; as described above.
The display device in the embodiment comprises the backlight module in the embodiment; therefore, the display device in this embodiment has all the features and corresponding effects in the above embodiments, and the effects of the display device in this embodiment are not described herein again.
EXAMPLE III
As shown in fig. 5, based on the above embodiments, a method for adjusting color temperature of backlight is provided.
As shown in fig. 5, in an implementation manner of the embodiment of the present invention, a method for adjusting a color temperature of a backlight includes:
and S100, acquiring a target color temperature value, and determining a corresponding adjusting parameter according to the target color temperature value.
In the embodiment, the display devices with different color gamuts can be adjusted by the backlight color temperature adjusting method to achieve the required color temperature value and keep the displayed brightness value unchanged; therefore, before adjusting the color temperature value of the display device, the display color gamut of the display device needs to be determined; wherein a display gamut is understood to be a spatial range of colors that the display device is capable of displaying.
In general, the display Standards of the display color gamut include Standards such as sRGB (standard Red Green Blue), NTSC (National Television Standards Committee), a standard color space customized by the american Television Standards Committee), Adobe RGB (a standard color space commonly developed by hewlett packard and microsoft in the united states), and DCI-P3 (a standard color space applied to digital cinema), and when the display color gamut of the display device is determined, the display color gamut of the display device needs to be compared with Standards such as sRGB, NTSC, Adobe RGB, and DCI-P3, for example, 100% sRGB, 72% NTSC, and 90% DCI-P3; in determining the display color gamut of the display device, the present embodiment takes the DCI-P3 standard as the standard of the display color gamut.
In this embodiment, the display color gamut of DCI-P3 with a color threshold greater than or equal to 65% is defined as a common color gamut, and in the common color gamut, the LED used as the light emitting source is a YAG phosphor LED (i.e., rare earth yttrium aluminum garnet series phosphor, phosphor used for making white light LEDs); defining the display color gamut of which the color threshold is greater than or equal to 80% of DCI-P3 as a common high color gamut, wherein under the common high color gamut, the LEDs adopted by the light emitting source are red and green fluorescent powder LEDs; and defining the display color gamut of which the color threshold is greater than or equal to 90% of DCI-P3 as a high color gamut, wherein the light-emitting source adopts a new red phosphor LED under the high color gamut; and defining the display color gamut with the color threshold value larger than or equal to 95% DCI-P3 as an ultrahigh color gamut, wherein a blue LED and a reflector plate or a diffusion plate made of quantum dot materials are adopted, or a composite type quantum dot diffusion plate is adopted, and the composite type quantum dot diffusion plate is a composite product of the diffusion plate and an optical membrane, wherein the quantum dot materials can be positioned in the diffusion plate or the optical membrane.
In this embodiment, the quantum dot material may be an inorganic quantum dot, a perovskite quantum dot, an organic-inorganic hybrid quantum dot, or the like. Among them, inorganic quantum dots are mainly group II-VI, group III-V system quantum dots, such as CdE (E ═ S/Se/Te) quantum dots, indium phosphide quantum dots, indium arsenide quantum dots, gallium arsenide quantum dots, and the like; in addition, there are other systems of quantum dots, such as: zinc sulfide quantum dots, zinc selenide quantum dots, and the like.
A novel hybrid perovskite quantum dot material is characterized in that an inner core is formed by R1NH3AB3 or (R2NH3)2AB4, R1 is methyl, R2 is an organic molecular group, A is one or more selected from Ge, Sn, Pb, Sb, Bi, Cu or Mn, B is one or more selected from Cl, Br and I, A and B form a coordination octahedral structure, R1NH3 or R2NH3 is filled in gaps of the coordination octahedral structure, and a surface ligand is organic acid or organic amine.
The quantum yield of the hybrid quantum dot material is very high, the half-peak width is narrower, and the luminescent color purity is higher; the organic-inorganic hybrid perovskite material combines the advantages of organic and inorganic materials, so that the organic-inorganic hybrid perovskite material has the advantages of good thermal stability, mechanical property and electromagnetic property of inorganic components, easy processing and film formation of organic components and the like, and the preparation process is relatively simple; therefore, the perovskite material has great advantages when being applied to backlight, not only can high color gamut be realized, but also the backlight cost can be greatly reduced; similar perovskite materials are also inorganic perovskite and inorganic-organic hybrid perovskite materials, which have chemical formulas mainly of inorganic perovskite CsPbX3(x ═ Cl/Br/I) and organic-inorganic hybrid perovskite materials CH3NH3PbX3(x ═ Cl/Br/I), CH3NH3PbX3(x ═ Cl/Br/I).
In this embodiment, according to the determined display color gamut, a target color temperature value input by a user may be obtained, and then a corresponding adjustment parameter is determined according to the display color gamut and the target color temperature value; the target color temperature value may be a fixed value in the color temperature value region, for example: the color temperature value area is 6500K-10000K, and the target color temperature value input by the user can be 6500K, 8000K, 10000K, etc. Since the display color gamut of each display device is different, the corresponding adjustment parameters are also different when the user inputs different color temperature values.
It should be noted that the color temperature adjusting method and the adjusting parameters in the embodiment can be applied to both the lateral backlight light source scheme and the direct backlight light source scheme; the side-in type backlight light source scheme refers to a scheme in which light emitting sources are disposed at side surfaces (e.g., upper and lower sides) of a light guide plate; the direct-type backlight light source scheme is a scheme in which the light emitting source is disposed behind the diffusion plate.
Taking the direct type backlight light source scheme as an example, the manner of acquiring the color temperature adjustment parameters of the different display color gamuts is described as follows:
in the direct type backlight light source scheme, the number and the arrangement scheme of the LED lamps are determined, the adjustable range of the color temperature of the display device is 6500K-10000K, and the color temperature value options of A, B, C are provided as three color temperature values A (6500K), B (8000K) and C (10000K) are selectable; the initial color temperature value of the display device is 6500K, and the initial brightness value is 400 nits.
In this embodiment, when the display color gamut of the display device is greater than or equal to 65% DCI-P3, the corresponding adjustment parameter is obtained by:
firstly, obtaining an initial brightness value of a display device, and then determining the specifications of a white light LED and a blue light LED according to the initial brightness value, wherein the white light LED adopts a YAG fluorescent powder white light LED; parameters such as LED-PKG, single crystal and double crystal of YAG phosphor white light LED and blue light LED are determined, and mainly drive parameters required for driving the YAG phosphor white light LED and the blue light LED are determined, such as: a luminance bin value (i.e., a luminance level value), a chrominance bin value (i.e., a chrominance level value), and a current specification (i.e., a current value and a voltage value), etc.
Because the common color gamut adopts a mixed light source of a blue light LED and a YAG fluorescent powder white light LED; therefore, the blue LED and the YAG phosphor white LED can be arranged in an independent control mode; when the color temperature value needs to be adjusted, the target current value of the blue LED can be calculated according to the target color temperature value.
For example: assuming that the initial color temperature value of the display device is 6500K, when the input color temperature value is 6500K, setting the current of all the blue LEDs to be 0A, at the moment, the color temperature value displayed after the light emitted by the YAG fluorescent powder white LED passes through the liquid crystal screen is 6500K, and the brightness value, the chromatic value and the current value of the YAG fluorescent powder white LED can be obtained through calculation; after the brightness value, the chromatic value and the current value of the YAG phosphor white light LED are obtained, if the color temperature value needs to be adjusted to 8000K, the current value of the blue light LED required when the target color temperature value is reached is calculated (namely the target current value of the blue light LED is calculated) based on the brightness value, the chromatic value and the current value of the YAG phosphor white light LED.
That is, in an implementation manner of this embodiment, the step 100 specifically includes the following steps:
step 110, obtaining a target color temperature value;
and step 120, calculating a target current value of the blue LED according to the target color temperature value.
In another implementation manner, when the display color gamut of the display device is greater than or equal to 80% DCI-P3, or when the display color gamut of the display device is greater than or equal to 90% DCI-P3, the corresponding adjustment parameters are acquired by:
firstly, acquiring an initial brightness value of a display device, and then determining the specification of an RG fluorescent powder white light LED or a new red fluorescent powder white light LED according to the initial brightness value; the specification of the RG phosphor white light LED or the new red phosphor white light LED to be determined is a driving parameter required for driving the RG phosphor white light LED or the new red phosphor white light LED, for example: a luminance bin value (luminance gradation value), a chrominance bin value (chrominance gradation value), and a current specification (current value and voltage value); and then, calculating target current values of the blue LED and the YAG fluorescent powder white LED based on the driving parameters required by the RG fluorescent powder white LED or the new red fluorescent powder white LED.
For example: when the input color temperature value is 6500K, the color temperature value displayed by the RG fluorescent powder white light LED or the new red fluorescent powder white light LED after passing through the liquid crystal screen is 6500K, and the target brightness value, the target chromaticity value and the target current value of the RG fluorescent powder white light LED or the new red fluorescent powder white light LED can be obtained through calculation; when the color temperature value is switched from 6500K to 10000K, the target current values of the blue LED and the YAG fluorescent powder white LED can be calculated based on the driving parameters required by the RG fluorescent powder white LED or the new red fluorescent powder white LED.
In another implementation manner, when the display color gamut of the display device is greater than or equal to 95% DCI-P3, the corresponding adjustment parameter is obtained by:
firstly, obtaining an initial brightness value of a display device, and then determining the specification of a blue LED according to the initial brightness value; the specification of the blue light LED to be determined is a target brightness value, a target chromaticity value and a target current value which are required for driving the blue light LED; and then, calculating a target current value of the quantum dot fluorescent powder white light LED based on the driving parameters of the blue light LED.
For example: when the input color temperature value is 6500K, the current of the quantum dot fluorescent powder white light LED is 0A, the color temperature value displayed after the light emitted by the blue light LED passes through the liquid crystal screen is 6500K, and the target brightness value, the target chromaticity value and the target current value of the blue light LED lamp bead can be obtained through calculation; when the color temperature value is switched from 6500K to 10000K, the target current value of the quantum dot fluorescent powder white light LED can be calculated based on the driving parameters required by the blue light LED.
When a display scheme with a display color gamut larger than or equal to 95% DCI-P3 is set, the white light LED in FIG. 2 needs to be replaced by a blue light LED, and the blue light LED in FIG. 2 needs to be replaced by a quantum dot phosphor white light LED; a quantum dot optical membrane or a diffusion plate is required to be arranged in the optical membrane group; the blue light LED is used for exciting the quantum dot material to generate three colors of red, green and blue, and the three colors are mixed to generate white light.
When the quantum dots are used as a backlight source, the red, green and blue colors are excited by the blue light LED, so that the backlight source scheme mainly uses the blue light LED, the quantum dot fluorescent powder white light LED plays a role in auxiliary adjustment, the current of the quantum dot fluorescent powder white light LED is 0A at the beginning of the design, and the current of the blue light LED is adjusted according to the initial brightness value and the initial color temperature specification of a product.
According to the invention, the required color temperature values can be adjusted according to different display color gamuts by acquiring the adjusting parameters of the different display color gamuts; on the premise of not reducing the display brightness, the color temperature values of various color gamut schemes can be adjusted at will.
As shown in fig. 1, in an implementation manner of the embodiment of the present invention, the method for adjusting color temperature of backlight further includes the following steps:
and S200, adjusting the color temperature value and the brightness value of the display device according to the adjusting parameters.
In this embodiment, after the adjustment parameter is obtained, the color temperature value and the brightness value of the display device may be adjusted according to the adjustment parameter, and the adjustment of the color temperature value is realized on the premise of not reducing the display brightness.
It should be noted that, in this embodiment, the blue LED and the white LED are used for auxiliary adjustment, and the display brightness value is adjusted by adjusting the current value ratio of the blue LED and the current value ratio of the white LED, so that when the display color temperature value is adjusted to the required color temperature value, the display brightness value is ensured to be unchanged.
In this embodiment, when the display color gamut of the display device is greater than or equal to 65% DCI-P3, the color temperature value and the brightness value are adjusted in the following manner:
firstly, driving a YAG fluorescent powder white light LED according to the initial current value of the YAG fluorescent powder white light LED; and then, the blue LED is lightened according to the target current value of the blue LED, and the purpose of lightening the blue LED is to ensure that light emitted by the blue LED and the YAG fluorescent powder white LED can reach a required color temperature value after passing through the liquid crystal screen.
Then, detecting the current brightness value of the display device, and judging whether the current brightness value of the display device is the same as the initial brightness value; when the brightness values of the displays are different, the brightness value of the display is the same as the initial brightness value (namely 400nits) by adjusting the current value ratio of the blue LED and the current value ratio of the YAG fluorescent powder white LED.
For example, when the color temperature value is switched from 6500K to 8000K, the YAG phosphor white LED and the blue LED are simultaneously turned on, and the displayed color temperature value reaches 8000K by adjusting the current value of the blue LED; if the brightness value is detected to be reduced, acquiring a first preset proportion and a second preset proportion, adjusting the current value proportion of the blue LED according to the first preset proportion, and adjusting the current value proportion of the YAG fluorescent powder white light LED according to the second preset proportion, so that the color temperature value of the YAG fluorescent powder white light LED is 8000K after the YAG fluorescent powder white light LED passes through the liquid crystal screen, and the brightness is kept unchanged; wherein, the first preset proportion can be set as 1: 0.05, the second preset ratio may be set to 0.08: 1.
Specifically, the first preset proportion can be set according to the number of the YAG phosphor white LEDs and the distance between the YAG phosphor white LEDs; likewise, the second predetermined ratio may be set according to the number of blue LEDs and the pitch of the blue LEDs.
When the color temperature value is switched from 8000K to 10000K, the adjustment scheme is the same as that of 8000K (switching the color temperature value from 6500K to 8000K).
That is, in an implementation manner of this embodiment, the step S200 specifically includes the following steps:
step S210, adjusting the current value of the blue light LED to a target current value according to the target current value of the blue light LED;
step S220, obtaining the adjusted brightness value, and judging whether the adjusted brightness value is the same as the brightness value before adjustment;
step S230, if not, acquiring a first preset proportion and a second preset proportion;
step S240, adjusting the current value proportion of the blue light LED according to a first preset proportion, and adjusting the current value proportion of the white light LED according to a second preset proportion.
In another implementation, when the display color gamut of the display device is greater than or equal to 80% DCI-P3, or when the display color gamut of the display device is greater than or equal to 90% DCI-P3, the color temperature values and the brightness values are adjusted by:
firstly, driving the RG fluorescent powder white light LED or the new red fluorescent powder white light LED according to the initial current value of the RG fluorescent powder white light LED or the new red fluorescent powder white light LED.
Then, the YAG phosphor white LED is lit up according to a target current value of the YAG phosphor white LED, and the blue LED is lit up according to a target luminance value of the blue LED.
And finally, detecting the current brightness value of the display device, judging whether the current brightness value of the display device is the same as the initial brightness value, and when the displayed brightness values are different, adjusting the current value proportion of the blue LED and the current value proportion of the YAG fluorescent powder white LED to enable the displayed brightness value to be the same as the initial brightness value (namely 400 nits).
It should be noted that, here, the blue LED and the YAG phosphor white LED are used for auxiliary adjustment, that is, the display color temperature value and the brightness value are adjusted in an auxiliary manner.
For example: when the color temperature value is switched from 6500K to 8000K, the blue LED and the YAG fluorescent powder white LED are lightened, and the current value proportion of the blue LED and the current value proportion of the YAG fluorescent powder white LED are simultaneously adjusted, so that the color temperature value is 8000K after the blue LED passes through the liquid crystal screen, and the brightness is kept unchanged, wherein the current value proportion of the blue LED and the current value proportion of the YAG fluorescent powder white LED can respectively adopt the current value proportions; at this time, the current of the RG phosphor white LED or the new red phosphor white LED is unchanged.
Compared with an RG phosphor white light LED or a new red phosphor white light LED, the YAG phosphor white light LED has low cost, and the YAG phosphor white light LED and the RG phosphor white light LED or the new red phosphor white light LED are simultaneously lightened to meet the specification requirements of an initial product brightness value and an initial color temperature value in view of the cost problem; the color gamut size needs to be noticed here because the display color gamut is affected when the brightness of the YAG phosphor white LED is too high.
In this embodiment, when the display color gamut of the display device is greater than or equal to 95% DCI-P3, the color temperature value and the brightness value are adjusted by:
firstly, driving a blue LED lamp bead according to the initial current value of the blue LED;
then, driving the quantum dot fluorescent powder white light LED according to the target brightness value of the quantum dot fluorescent powder white light LED so as to assist in adjusting the displayed color temperature value and the brightness value;
finally, detecting the current brightness value of the display device, and determining whether the current brightness value of the display device is the same as the initial brightness value; if the current value of the blue LED is different from the current value of the quantum dot fluorescent powder white LED, the current value ratio of the blue LED and the current value ratio of the quantum dot fluorescent powder white LED are adjusted, so that the displayed brightness value is the same as the initial brightness value (namely 400 nits).
It should be noted that, the quantum dot phosphor white LED is used herein for auxiliary adjustment, that is, auxiliary adjustment of the display color temperature value and the display brightness value.
For example: when the color temperature value is switched from 6500K to 8000K, the blue light LED and the quantum dot fluorescent powder white light LED are lightened, and the current value proportion of the blue light LED and the current value proportion of the quantum dot fluorescent powder white light LED are simultaneously adjusted, so that the color temperature value is 8000K after the blue light LED and the quantum dot fluorescent powder white light LED pass through the liquid crystal screen, and the brightness is kept unchanged, wherein the current value proportion of the blue light LED and the current value proportion of the quantum dot fluorescent powder white light LED can respectively adopt the current value proportions.
The magnitude of the color gamut value needs to be noticed here because the luminance of the quantum dot phosphor white LED is too high, which has an influence on the color gamut value.
It is worth mentioning that, in an implementation manner of this embodiment, the quantum dot phosphor white light LED may select a product with a color temperature value of 6500K, because the initial specification of the color temperature of the product is 6500K, it is convenient to use it as a reference for fast adjustment; because of the compensation effect of the blue light LED on the blue light, the quantum dot material which only excites to generate red and green colors can be placed in the quantum dot film.
In addition, because the YAG phosphor white light LED, the new red phosphor white light LED and the RG phosphor white light LED have low cost, in order to achieve high cost performance, the backlight source can adopt a blue light LED, a YAG phosphor white light LED and a new red phosphor white light LED/RG phosphor white light LED; the brightness value of the display can be rapidly improved by improving the current value of the YAG fluorescent powder white light LED; meanwhile, the problem of reduced display color gamut caused by the increase of white light can be solved by adding a new red phosphor white light LED/RG phosphor white light LED.
In an implementation manner of this embodiment, new red phosphor/RG phosphor may be added to the quantum dot film or diffusion plate and mixed with the quantum dots to compensate the color gamut; here, the amount of the new red phosphor/RG phosphor added needs to be determined according to actual specifications.
In an implementation manner of this embodiment, the blue LED and the white LED may be Minioled or Microled, and since the Minioled or Microled has a small size, the influence on the optical picture effect is small during color temperature adjustment, and the color temperature value and the brightness value of the display can be conveniently and better adjusted.
In the embodiment, the displayed color temperature value reaches the target color temperature value by adjusting the current value ratio of the blue light LED and the current value ratio of the YAG phosphor white light LED, and the displayed brightness value is unchanged.
In summary, the present invention provides a backlight module, a display device and a method for adjusting color temperature of backlight, wherein the backlight module includes: the backlight source is arranged on the reflector plate and used for adjusting the color temperature value and the brightness value; the backlight source and the reflector plate are arranged on the light incident side of the diffusion plate, and the optical film is arranged on the light emergent side of the diffusion plate so as to provide incident light for the display screen. According to the invention, the backlight source used for adjusting the color temperature value and the brightness value is arranged, so that the current value proportion of the LED in the backlight source can be adjusted when the color temperature value of the display device is adjusted, and the brightness of the display device is unchanged.
Of course, it will be understood by those skilled in the art that all or part of the processes of the methods of the above embodiments may be implemented by a computer program instructing relevant hardware (such as a processor, a controller, etc.), and the program may be stored in a computer readable storage medium, and when executed, the program may include the processes of the above method embodiments. The storage medium may be a memory, a magnetic disk, an optical disk, etc.
It is to be understood that the invention is not limited to the examples described above, but that modifications and variations may be effected thereto by those of ordinary skill in the art in light of the foregoing description, and that all such modifications and variations are intended to be within the scope of the invention as defined by the appended claims.
Claims (13)
1. A backlight module, comprising: the backlight source is arranged on the reflecting sheet and used for adjusting the color temperature value and the brightness value; the backlight source and the reflector plate are arranged on the light inlet side of the diffusion plate, and the optical film is arranged on the light outlet side of the diffusion plate to provide incident light for the display screen.
2. A backlight module according to claim 1, wherein the reflector sheet comprises a central light-reflecting region and a plurality of side light-reflecting regions surrounding the central light-reflecting region; the backlight source is arranged in the central light reflecting area and distributed in an array manner.
3. The backlight module according to claim 2, wherein the array of distributed backlights comprises: a pure color light train and a mixed light train; the pure color light columns and the mixed light columns are arranged alternately.
4. The backlight module according to claim 3, wherein the pure color light columns comprise white light LED light columns or blue light LED light columns; the mixed light column comprises a mixed light column of white light LEDs and blue light LEDs.
5. The backlight module as claimed in claim 4, wherein the white LEDs and the blue LEDs in the mixed light columns are alternately arranged, and the arrangement order of the white LEDs and the arrangement order of the blue LEDs in two adjacent mixed light columns are different.
6. The backlight module according to claims 1-5, wherein the white LEDs in the white LED light train or the mixed light train comprise: yttrium aluminum garnet phosphor LED, red green phosphor LED, red phosphor LED and quantum dot phosphor LED.
7. The backlight module as claimed in claim 4, wherein when the pure color light string is a blue LED light string, the diffuser is a quantum dot diffuser, or the optical film is a quantum dot optical film, or the diffuser is a composite quantum dot diffuser.
8. A backlight module according to claim 7, wherein the quantum dot diffuser plate or the composite quantum dot diffuser plate comprises: inorganic quantum dot material diffusion plates, perovskite quantum dot material diffusion plates, and organic-inorganic hybrid quantum dot material diffusion plates.
9. The backlight module of claim 7, wherein the quantum dot optical film comprises: inorganic quantum dot material optical diaphragms, perovskite quantum dot material optical diaphragms and organic-inorganic hybrid quantum dot material optical diaphragms.
10. A display device, comprising a front frame, a back plate and the backlight module of any one of claims 1 to 9;
the backlight module includes: the backlight source is arranged on the reflecting sheet and used for adjusting the color temperature value and the brightness value; the backlight source and the reflector plate are arranged on the light inlet side of the diffusion plate, and the optical film is arranged on the light outlet side of the diffusion plate to provide incident light for the display screen.
11. A backlight color temperature adjusting method for adjusting the backlight color temperature of the display device according to claim 10, the method comprising:
acquiring a target color temperature value, and determining corresponding adjusting parameters according to the target color temperature value;
and adjusting the color temperature value and the brightness value of the display device according to the adjusting parameters.
12. The method according to claim 11, wherein the obtaining a target color temperature value and determining a corresponding adjustment parameter according to the target color temperature value comprises:
acquiring the target color temperature value;
and calculating a target current value of the blue LED according to the target color temperature value.
13. The method according to claim 12, wherein the adjusting the color temperature value and the brightness value of the display device according to the adjustment parameter comprises:
adjusting the current value of the blue light LED to the target current value according to the target current value of the blue light LED;
acquiring an adjusted brightness value, and judging whether the adjusted brightness value is the same as the brightness value before adjustment;
if not, acquiring a first preset proportion and a second preset proportion;
and adjusting the current value proportion of the blue light LED according to the first preset proportion, and adjusting the current value proportion of the white light LED according to the second preset proportion.
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