CN112083598A - Backlight module, driving method thereof and display device - Google Patents
Backlight module, driving method thereof and display device Download PDFInfo
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- CN112083598A CN112083598A CN201910510349.2A CN201910510349A CN112083598A CN 112083598 A CN112083598 A CN 112083598A CN 201910510349 A CN201910510349 A CN 201910510349A CN 112083598 A CN112083598 A CN 112083598A
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- 238000000034 method Methods 0.000 title claims abstract description 27
- 239000012788 optical film Substances 0.000 claims abstract description 17
- 238000005192 partition Methods 0.000 claims description 60
- 239000002096 quantum dot Substances 0.000 claims description 40
- 239000010408 film Substances 0.000 claims description 28
- 230000005284 excitation Effects 0.000 claims description 7
- 238000001228 spectrum Methods 0.000 abstract description 5
- 239000000463 material Substances 0.000 description 13
- 239000004973 liquid crystal related substance Substances 0.000 description 7
- 238000012986 modification Methods 0.000 description 5
- 230000004048 modification Effects 0.000 description 5
- 239000000758 substrate Substances 0.000 description 4
- 238000009792 diffusion process Methods 0.000 description 3
- 238000002834 transmittance Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000003086 colorant Substances 0.000 description 2
- 238000000638 solvent extraction Methods 0.000 description 2
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- 230000000694 effects Effects 0.000 description 1
- 238000002310 reflectometry Methods 0.000 description 1
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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
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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
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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
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Abstract
The invention discloses a backlight module, a driving method thereof and a display device, comprising the following steps: the backlight module comprises a yellow backlight unit, a blue backlight unit and an optical film, wherein the blue backlight unit is positioned at the light-emitting side of the yellow backlight unit, and the optical film is positioned at the light-emitting side of the blue backlight unit; the yellow backlight unit emits yellow backlight; the blue backlight unit emits blue backlight. The blue backlight unit and the yellow backlight unit can be driven independently, when a display picture is a blue picture, the yellow backlight unit is closed, only the blue backlight unit is driven independently, at the moment, the backlight spectrum only has a blue light waveband, a green light waveband does not exist, and light rays in the green light waveband cannot exist even if the blue light is filtered by the blue color resistor, so that the color purity of blue-based light is higher. Similarly, when the display picture is a green picture and/or a red picture, the blue backlight unit is turned off, and only the yellow backlight unit is driven alone, so that high-purity green primary light can be obtained. Thereby, a higher color gamut display can be realized even under the condition that the color-blocking filter performance is limited.
Description
Technical Field
The invention relates to the technical field of display, in particular to a backlight module, a driving method thereof and a display device.
Background
The liquid crystal display panel used in the present stage is composed of an array substrate and a color film substrate, the backlight module needs to provide white backlight, the white light is filtered by a color resistor on the color film substrate to form three primary colors, and then data signals of each sub-pixel unit are controlled according to the array substrate so that each sub-pixel unit displays different gray scale brightness, and a display picture is formed by combining the colors of the sub-pixels.
However, the color resistance used at the present stage is limited by the characteristics of the color resistance material, and the thickness of the color resistance cannot be set too thick to improve the transmittance, so that the blue color resistance still has a higher transmittance in the green light band, and the blue color resistance filters out blue light and simultaneously has a part of light in the green light band to transmit, which affects the color purity of the blue light; similarly, the green color resistor also has a certain transmittance in the blue light band, and the green color resistor filters out green light and simultaneously has a part of light of the blue light band to transmit, which also affects the color purity of the green light. Then, the display panel cannot achieve a higher gamut range in view of the current-stage color resistance limitation.
Disclosure of Invention
The invention provides a backlight module, a driving method thereof and a display device, which are used for improving the display color gamut.
In a first aspect, the present invention provides a backlight module, including: the backlight module comprises a yellow backlight unit, a blue backlight unit and an optical film, wherein the blue backlight unit is positioned at the light-emitting side of the yellow backlight unit, and the optical film is positioned at the light-emitting side of the blue backlight unit;
the yellow backlight unit is used for emitting yellow backlight;
the blue backlight unit is used for emitting blue backlight.
In a possible implementation manner, in the backlight module provided in the present invention, the yellow backlight unit includes: the light source comprises a first light source, a first light guide plate and a quantum dot film; the first light source is positioned on one side of the light incident surface of the first light guide plate, and the quantum dot film is positioned on one side of the light emergent surface of the first light guide plate; the quantum dot film is used for generating yellow light under excitation of emergent light of the first light source.
In a possible implementation manner, in the backlight module provided by the present invention, the backlight module further includes: and the reflector plate is positioned on one side of the first light guide plate, which deviates from the quantum dot film.
In a possible implementation manner, in the backlight module provided in the present invention, the yellow backlight unit includes: the array light source, be located the diffuser plate of light source light-emitting side, and be located the diffuser plate deviates from the quantum dot diaphragm of light source one side.
In a possible implementation manner, in the backlight module provided in the present invention, the blue backlight unit includes: a second light source and a second light guide plate; the second light source is located on one side of the light incident surface of the second light guide plate, and the optical film is located on one side of the light emergent surface of the second light guide plate.
In a possible implementation manner, in the backlight module provided by the present invention, the backlight module further includes: a blue light reflecting sheet positioned between the yellow backlight unit and the blue backlight unit;
the blue light reflecting sheet is used for reflecting blue light and transmitting light with wavelength larger than that of other wave bands of the blue light.
In a second aspect, the present invention provides a display device, including any one of the above backlight modules.
In a third aspect, the present invention provides a driving method for any one of the above backlight modules, where a yellow backlight unit and a blue backlight unit in the backlight module are both divided into a plurality of partitions, the driving method including:
receiving an image data signal; the image data signal includes: a data signal of a blue sub-pixel, a data signal of a green sub-pixel and a data signal of a red sub-pixel;
determining backlight values of the partitions of the blue backlight unit according to the data signals of the blue sub-pixels; determining backlight values of all partitions of the yellow backlight unit according to the data signals of the green sub-pixels and the data signals of the red sub-pixels;
and respectively controlling the brightness of the corresponding subarea according to the determined backlight value of each subarea of the blue backlight unit and the determined backlight value of each subarea of the yellow backlight unit.
In a possible implementation manner, in the above driving method provided by the present invention, the determining backlight values of the partitions of the blue backlight unit according to the data signals of the blue sub-pixels includes:
respectively determining the gray-scale values of the blue sub-pixels in each partition of the blue backlight unit according to the data signals of the blue sub-pixels;
respectively determining the backlight value of each subarea according to the gray-scale value of the blue sub-pixel in each subarea and a set rule;
determining the gain backlight value of each subarea according to the backlight value of each subarea and a gain curve preset by the blue backlight unit;
the determining the backlight value of each partition of the yellow backlight unit according to the data signal of the green sub-pixel and the data signal of the red sub-pixel comprises:
respectively determining the gray-scale values of the green sub-pixel and the red sub-pixel in each partition of the yellow backlight unit according to the data signal of the green sub-pixel and the data signal of the red sub-pixel;
respectively determining the backlight value of each subarea according to the gray-scale values of the green sub-pixels and the red sub-pixels in each subarea and a set rule;
and determining the gain backlight value of each subarea according to the backlight value of each subarea and a gain curve preset by the yellow backlight unit.
In a possible implementation manner, in the driving method provided by the present invention, the setting rule is to take a weighted average of the maximum gray-scale value and the average gray-scale value of the sub-pixels in the partition.
In a possible implementation manner, in the driving method provided by the present invention, the controlling the brightness of the corresponding partition according to the determined backlight value of each partition of the blue backlight unit and the determined backlight value of each partition of the yellow backlight unit includes:
and respectively controlling the driving current or the duty ratio of a pulse width modulation signal of the corresponding subarea according to the determined gain backlight value of each subarea of the blue backlight unit and the yellow backlight unit so as to control the brightness of each subarea.
The invention has the following beneficial effects:
the invention provides a backlight module, a driving method thereof and a display device, comprising the following steps: the backlight module comprises a yellow backlight unit, a blue backlight unit and an optical film, wherein the blue backlight unit is positioned at the light-emitting side of the yellow backlight unit, and the optical film is positioned at the light-emitting side of the blue backlight unit; a yellow backlight unit for emitting yellow backlight; and a blue backlight unit for emitting a blue backlight. The blue backlight and the yellow backlight are respectively provided with the backlight units, the two backlight units can be independently driven, when a display picture is a blue picture, the yellow backlight unit is closed, only the blue backlight unit is independently driven, the backlight spectrum only has a blue light waveband at the moment, a green light waveband does not exist, and light rays in the green light waveband cannot exist even if the blue light is filtered by a blue color resistor, so that the color purity of blue-base light is higher. Similarly, when the display picture is a green picture and/or a red picture, the blue backlight unit is turned off, and only the yellow backlight unit is driven alone, so that high-purity green primary light can be obtained. Thereby, a higher color gamut display can be realized even under the condition that the color-blocking filter performance is limited.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments of the present invention will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic cross-sectional view of a backlight module according to an embodiment of the invention;
fig. 2 is a second schematic cross-sectional view illustrating a backlight module according to an embodiment of the invention;
fig. 3 is a third schematic cross-sectional view illustrating a backlight module according to an embodiment of the invention;
FIG. 4 is a fourth schematic cross-sectional view of a backlight module according to an embodiment of the present invention;
FIG. 5 is a fifth schematic cross-sectional view illustrating a backlight module according to an embodiment of the present invention;
FIG. 6 is a sixth schematic cross-sectional view of a backlight module according to an embodiment of the present invention;
FIG. 7 is a seventh schematic cross-sectional view illustrating a backlight module according to an embodiment of the present invention;
FIG. 8 is a graph illustrating the reflectivity of a blue reflector according to an embodiment of the present invention;
fig. 9 is a schematic cross-sectional view of a display device according to an embodiment of the invention;
fig. 10 is a second schematic cross-sectional view illustrating a display device according to an embodiment of the invention;
fig. 11 is a flowchart of a driving method of a backlight module according to an embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings, and it is apparent that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The backlight module, the control method thereof and the display device provided by the embodiments of the invention are described in detail below with reference to the accompanying drawings.
In a first aspect of the embodiments of the present invention, a backlight module is provided, as shown in fig. 1, the backlight module provided in the embodiments of the present invention includes: a yellow backlight unit 100, a blue backlight unit 200 positioned at the light-emitting side of the yellow backlight unit 100, and an optical film 300 positioned at the light-emitting side of the blue backlight unit 200; the yellow backlight unit 100 is configured to emit yellow backlight; and a blue backlight unit 200 for emitting a blue backlight.
In the backlight module provided by the embodiment of the invention, the blue backlight and the yellow backlight are respectively provided with the backlight units, and the two backlight units can be independently driven, so that when the display picture is a blue picture, the yellow backlight unit is closed, only the blue backlight unit is independently driven, the backlight spectrum only has a blue light waveband at the moment, a green light waveband does not exist, and light rays in the green light waveband cannot exist even if the blue light is filtered by the blue color resistor, so that the color purity of blue basic light is higher. Similarly, when the display picture is a green picture and/or a red picture, the blue backlight unit is turned off, and only the yellow backlight unit is driven alone, so that high-purity green primary light can be obtained. Thereby, a higher color gamut display can be realized even under the condition that the color-blocking filter performance is limited.
In a specific implementation, each of the blue backlight unit and the yellow backlight unit may be divided into a plurality of partitions, and each partition may be independently controlled. The image data signals of the image to be displayed in each partition can be used for respectively and independently controlling each partition of the blue backlight unit and the yellow backlight unit. When displaying a white picture, simultaneously starting a blue backlight unit and a yellow backlight unit; when the mixed color picture is displayed, the image data signal can be divided into a data signal of a blue sub-pixel and a data signal of a red sub-pixel and a green sub-pixel, each subarea of the blue backlight unit is driven according to the data signal of the blue sub-pixel corresponding to each subarea, and each subarea of the yellow backlight unit is driven according to the data signal of the red sub-pixel and the green sub-pixel corresponding to each subarea. When the display picture is changed, the backlight brightness of each subarea of the blue backlight unit and the yellow backlight unit is correspondingly and dynamically controlled, so that the color gradation of the picture display is improved. By adopting the backlight module provided by the embodiment of the invention, the color gamut coverage of 100% BT.2020 can be realized.
Specifically, as shown in fig. 2, the yellow backlight unit 100 may include: a first light source 11, a first light guide plate 12, and a quantum dot film 13; the first light source 11 is located on one side of the light incident surface of the first light guide plate 12, and the quantum dot film 13 is located on one side of the light emergent surface of the first light guide plate 12. And the quantum dot film 13 is used for generating yellow light under excitation of light emitted by the first light source 11.
The yellow backlight unit 100 provided in the embodiment of the present invention may adopt a side-in type backlight structure, wherein a light bar formed by a plurality of first light sources 11 is disposed on one side of the light incident surface of the first light guide plate 12, the light emitting surface of the first light sources 11 faces the light incident surface of the first light guide plate 12, and the light is diffused into a surface light source by the first light guide plate 12 and then enters the quantum dot film 13. The quantum dot film 13 may contain a red quantum dot material and a green quantum dot material at the same time, the red quantum dot material generates red light under the excitation of the emergent light of the first light source 11, the green quantum dot material generates green light under the excitation of the emergent light of the first light source 11, and the red light and the green light are mixed to generate yellow light. The wavelength of the light emitted from the first light source 11 is smaller than the wavelength range corresponding to the red light and the green light, and the quantum dot material in the quantum dot film can be excited to generate the red light and the green light.
In order to improve the utilization efficiency of light, as shown in fig. 3, a reflective sheet 400 may be disposed on a side of the first light guide plate 12 of the backlight module, which is away from the quantum dot film 13. The red light and the green light excited and emitted by the quantum dot material in the quantum dot film have no directionality, and the reflector 400 is disposed on the side opposite to the light-emitting surface of the first light guide plate 12, so that the red light and the green light incident to the bottom of the light guide plate can be reflected to the light-emitting surface of the first light guide plate 12, thereby improving the utilization efficiency of the yellow backlight.
In another implementation manner, as shown in fig. 4, the yellow backlight unit 100 provided in the embodiment of the present invention may include: the array of light sources 11 ', the diffuser plate 12' on the light emitting side of the light sources, and the quantum dot film 13 on the side of the diffuser plate 12 'away from the light sources 11'.
The yellow backlight unit 100 provided by the embodiment of the present invention may also adopt a direct type backlight structure, the light sources 11 ' are distributed in an array on the back plate, and the diffusion plate 12 ' is disposed on the light emitting side of the light sources 11 ' to homogenize the emergent light of the light sources and then to enter the quantum dot film 13. The quantum dot film 13 may contain a red quantum dot material and a green quantum dot material at the same time, the red quantum dot material generates red light under the excitation of the emergent light of the light source 11 ', the green quantum dot material generates green light under the excitation of the emergent light of the light source 11', and the red light and the green light are mixed to generate yellow light. The wavelength of the light emitted from the light source 11' is smaller than the wavelength range corresponding to the red light and the green light, and the quantum dot material in the quantum dot film can be excited to generate the red light and the green light.
The yellow backlight unit 100 may be of a side-in type or a direct-out type, and may be selected according to the requirement in practical application. When the yellow backlight unit 100 adopts a side-in type backlight structure, the yellow backlight unit 100 may be divided into a plurality of bar-shaped partitions perpendicular to the extending direction of the light bars; or, the light bars may be disposed on two adjacent light incident surfaces of the first light guide plate 12, so as to realize block partitioning of the yellow backlight unit. When the yellow backlight unit 100 employs the direct type backlight structure, the yellow backlight unit 100 may be divided into array block partitions. The number of the light sources corresponding to each partition can be set according to actual needs, and is not limited herein.
On the other hand, as shown in fig. 5, the blue backlight unit 200 provided by the embodiment of the present invention may include: a second light source 21 and a second light guide plate 22; the second light source 21 is located on the light incident surface side of the second light guide plate 22, and the optical film 300 is located on the light emitting surface side of the second light guide plate 22.
Since the blue backlight unit 200 needs to transmit the light emitted from the yellow backlight unit 100, the blue backlight unit 200 may be implemented as a side-in type backlight structure. The plurality of second light sources 21 form a light bar, and are disposed on one side of the light incident surface of the second light guide plate 22, and the light emergent surface of the second light sources 21 faces the light incident surface of the second light guide plate 22. Since the second light source 21 emits blue light, a light source such as a blue light emitting diode may be used in practical applications, and the light emitted from the second light source 21 is diffused into a surface light source through the second light guide plate 22 and then emitted to the optical film 300.
In an implementation, the light sources in the yellow backlight unit 100 and the blue backlight unit 200 may both adopt blue light sources (e.g., blue light emitting diodes), and in this case, as shown in fig. 6 and 7, a blue light reflecting sheet 500 may be further disposed between the yellow backlight unit 100 and the blue backlight unit 200. As shown in fig. 6, when the yellow backlight unit 100 adopts a side-in type backlight structure, the blue light reflecting sheet 500 is located between the first light guide plate 12 and the second light guide plate 22, the quantum dot film 13 is close to the first light guide plate 12, and the blue light reflecting sheet 500 is close to the second light guide plate 22. As shown in fig. 7, when the yellow backlight unit 100 adopts the direct-type backlight structure, the blue-light reflecting sheet 500 is located between the diffusion plate 12 'and the second light guide plate 22, the quantum dot film 13 is close to the diffusion plate 12', and the blue-light reflecting sheet 500 is close to the second light guide plate 22.
The blue reflecting sheet 500 reflects blue light and transmits light having a wavelength longer than that of the blue light. The reflectance curve of the blue reflector 500 is shown in fig. 8, and the blue reflector can reflect all the light rays with the wavelength range below 490nm, and the light rays with the wavelength range above 490nm can pass through. Therefore, a part of the blue light emitted from the first light source 11 in the yellow backlight unit is used to excite the quantum dot film 13, and a part of the blue light directly penetrates through the quantum dot film 13 and is emitted to the blue light reflector 500, the blue light is reflected by the blue light reflector 500 back into the yellow backlight unit 100, the quantum dot material in the quantum dot film 13 is excited again to generate yellow light, and all the yellow light emitted from the quantum dot film 13 directly penetrates through the blue light reflector and is emitted to the blue backlight unit 200. In the blue light backlight unit 200, a part of the blue light emitted from the second light source 21 directly exits from the light-emitting surface of the second light guide plate 22 to the optical film 300, and a part of the blue light reaches the side opposite to the light-emitting surface of the second light guide plate 22, and after being reflected by the blue light reflecting sheet 500, the blue light can also exit to the optical film 300. Thereby improving the utilization efficiency of the light source.
In a second aspect of the embodiments of the present invention, a display device is provided, as shown in fig. 9 and fig. 10, the display device includes any one of the backlight modules provided in the embodiments of the present invention and a display panel P located at a light emitting side of the backlight module; when the yellow backlight unit 100 adopts a side-in type backlight structure, the display device structure is as shown in fig. 9; when the yellow backlight unit 100 adopts the direct type backlight structure, the display device structure is as shown in fig. 10. The display device can be a display device such as a liquid crystal panel, a liquid crystal display, a liquid crystal television and the like, and can also be a mobile device such as a mobile phone, a tablet personal computer, an electronic photo album and the like. Because the principle of the display device for solving the problems is similar to that of the backlight module, the implementation of the display device can be referred to that of the backlight module, and repeated details are not repeated.
In a third aspect of the embodiments of the present invention, a driving method based on any one of the above backlight modules is provided, as shown in fig. 11, the driving method of the backlight module may include:
s10, receiving an image data signal;
wherein the image data signal includes: a data signal of a blue sub-pixel, a data signal of a green sub-pixel and a data signal of a red sub-pixel;
s20, determining the backlight value of each partition of the blue backlight unit according to the data signal of the blue sub-pixel; determining backlight values of all partitions of the yellow backlight unit according to the data signals of the green sub-pixels and the data signals of the red sub-pixels;
and S30, controlling the brightness of the corresponding subarea according to the determined backlight value of each subarea of the blue backlight unit and the determined backlight value of each subarea of the yellow backlight unit.
The driving method of the backlight module provided by the embodiment of the invention can be suitable for dynamic backlight modulation scenes for partitioning the backlight, and the backlight module can independently control each backlight partition according to the display image, thereby being beneficial to improving the brightness level and the contrast of the image and optimizing the image display effect. The backlight module is generally used in combination with a liquid crystal display panel to form a liquid crystal display device, and the liquid crystal display device has a data processing function, and can receive an externally input image data signal and process the received image data signal, wherein the image data signal comprises a data signal of a red sub-pixel, a data signal of a green sub-pixel and a data signal of a blue sub-pixel. In general, the image data signal reflects the gray-scale values of the red, green and blue sub-pixels in the display panel, and the larger the gray-scale value is, the larger the display luminance of the sub-pixel is; the smaller the gray scale value, the smaller the display brightness of the sub-pixel. In order to better improve the contrast and the image gradation of the displayed image, the two backlight units can also be subjected to the partition dimming control according to the gray-scale value of the blue sub-pixel and the gray-scale value of the red sub-pixel and the green sub-pixel, so that the backlight brightness corresponding to the darker area of the image is smaller, and the backlight brightness corresponding to the brighter area of the image is larger.
In addition, the backlight module provided by the embodiment of the invention separately sets the blue backlight and the yellow backlight, so that when the display picture is a blue picture, the yellow backlight unit is closed, only the blue backlight unit is driven independently, the backlight spectrum only has a blue light waveband, a green light waveband does not exist, and light rays in the green light waveband cannot exist even if the blue light is filtered by the blue color resistor, so that the color purity of the blue-based light is higher. Similarly, when the display picture is a green picture and/or a red picture, the blue backlight unit is turned off, and only the yellow backlight unit is driven alone, so that high-purity green primary light can be obtained. Thereby, a higher color gamut display can be realized even under the condition that the color-blocking filter performance is limited.
Specifically, in the above step S20, determining the backlight value of each partition of the blue backlight unit according to the data signal of the blue sub-pixel includes:
respectively determining the gray-scale value of the blue sub-pixel in each subarea of the blue backlight unit according to the data signal of the blue sub-pixel;
respectively determining the backlight value of each subarea according to the gray-scale value of the blue sub-pixel in each subarea and a set rule;
and determining the gain backlight value of each subarea according to the backlight value of each subarea and a gain curve preset by the blue backlight unit.
Likewise, in the above step S20, determining the backlight value of each partition of the yellow backlight unit according to the data signal of the green sub-pixel and the data signal of the red sub-pixel includes:
respectively determining the gray-scale values of the green sub-pixel and the red sub-pixel in each partition of the yellow backlight unit according to the data signal of the green sub-pixel and the data signal of the red sub-pixel;
respectively determining the backlight value of each subarea according to the gray-scale values of the green sub-pixels and the red sub-pixels in each subarea and a set rule;
and determining the gain backlight value of each subarea according to the backlight value of each subarea and a gain curve preset by the yellow backlight unit.
The driving method of the backlight module provided by the embodiment of the invention separates the data signal of the blue sub-pixel and the data signal of the red sub-pixel and the green sub-pixel to perform data processing. For the blue backlight unit, it is necessary to extract data signals of all blue sub-pixels in the display screen, and determine a gray scale value corresponding to each blue sub-pixel according to the extracted data signals; since how much luminance each partition is driven for each partition of the blue backlight unit depends on the gray-scale level of each blue sub-pixel in the partition, the gray-scale values of each blue sub-pixel in the partition can be processed according to a certain set rule to obtain the backlight value corresponding to the partition. In practical application, the backlight values corresponding to the consecutive partitions may not differ significantly, and in order to reasonably express the different luminance levels in the display screen more clearly, the backlight value obtained through the above steps is not taken as the final value for driving the partition luminance, but a gain coefficient is respectively set for the backlight value of each partition according to the backlight value and a gain curve preset by the blue backlight unit, so as to obtain the gain backlight value of each partition, and the luminance of each partition is driven by the gain backlight value of each partition.
Similarly, for the yellow backlight unit, it is necessary to extract data signals of all red sub-pixels and all green sub-pixels in the display screen, and determine gray-scale values corresponding to the red sub-pixels and the green sub-pixels according to the extracted data signals; and processing the gray-scale values of the red sub-pixels and the green sub-pixels in the subarea according to a certain set rule to obtain the backlight value corresponding to the subarea. And setting a gain coefficient for the backlight value of each partition according to the backlight value and a gain curve preset by the yellow backlight unit to obtain the gain backlight value of each partition, and driving the brightness of each partition according to the gain backlight value of each partition.
In practical applications, the setting rule for processing the gray scale value may adopt a maximum value method, an average value method, a weighted average value method, an average value weighting method, and the like, which are not limited herein. For example, the setting rule in the embodiment of the present invention may be to take a weighted average of the maximum gray-scale value and the average gray-scale value of the sub-pixels in the partition as the backlight value of the partition. If the weight of the maximum gray level value in a partition is 1, the maximum gray level value is L1, the weight of the average gray level value is 0.5, and the average gray level value is L2, then the backlight value of the partition is (1 × L1+0.5 × L2)/2.
In a specific implementation, in step S30, the controlling the brightness of each partition according to the determined backlight value of each partition of the blue backlight unit and the determined backlight value of each partition of the yellow backlight unit includes:
and respectively controlling the driving current of the corresponding subarea or the duty ratio of the pulse width modulation signal according to the determined gain backlight value of each subarea of the blue backlight unit and the yellow backlight unit so as to control the brightness of each subarea.
When the light sources in the blue backlight unit and the yellow backlight unit both use light emitting diodes, the light emitting diodes are current mode control devices, and thus the light emitting brightness of the light emitting diodes can be adjusted by changing the driving current of the light emitting diodes. The light emitting diodes in each partition of the backlight unit are connected in series, and the light emitting brightness of each partition can be controlled by changing the driving current of each partition. In addition, the light-emitting time of each light-emitting diode in each subarea can be controlled by changing the point-space ratio of the pulse width modulation signal, and the longer the light-emitting time in the period is, the larger the light-emitting brightness is; on the contrary, when the light emitting time in the period is shorter, the light emitting brightness is smaller, so that the partition with the larger light emitting brightness can be controlled to have a larger duty ratio, and the partition with the smaller light emitting brightness can be controlled to have a smaller duty ratio, so as to realize the brightness adjustment of the partition.
The backlight module, the driving method thereof and the display device provided by the embodiment of the invention comprise the following steps: the backlight module comprises a yellow backlight unit, a blue backlight unit and an optical film, wherein the blue backlight unit is positioned at the light-emitting side of the yellow backlight unit, and the optical film is positioned at the light-emitting side of the blue backlight unit; a yellow backlight unit for emitting yellow backlight; and a blue backlight unit for emitting a blue backlight. The blue backlight and the yellow backlight are respectively provided with the backlight units, the two backlight units can be independently driven, when a display picture is a blue picture, the yellow backlight unit is closed, only the blue backlight unit is independently driven, the backlight spectrum only has a blue light waveband at the moment, a green light waveband does not exist, and light rays in the green light waveband cannot exist even if the blue light is filtered by a blue color resistor, so that the color purity of blue-base light is higher. Similarly, when the display picture is a green picture and/or a red picture, the blue backlight unit is turned off, and only the yellow backlight unit is driven alone, so that high-purity green primary light can be obtained. Thereby, a higher color gamut display can be realized even under the condition that the color-blocking filter performance is limited.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. A backlight module, comprising: the backlight module comprises a yellow backlight unit, a blue backlight unit and an optical film, wherein the blue backlight unit is positioned at the light-emitting side of the yellow backlight unit, and the optical film is positioned at the light-emitting side of the blue backlight unit;
the yellow backlight unit is used for emitting yellow backlight;
the blue backlight unit is used for emitting blue backlight.
2. The backlight module as claimed in claim 1, wherein the yellow backlight unit comprises: the light source comprises a first light source, a first light guide plate and a quantum dot film; the first light source is positioned on one side of the light incident surface of the first light guide plate, and the quantum dot film is positioned on one side of the light emergent surface of the first light guide plate; the quantum dot film is used for generating yellow light under excitation of emergent light of the first light source.
3. The backlight module of claim 2, wherein the backlight module further comprises: and the reflector plate is positioned on one side of the first light guide plate, which deviates from the quantum dot film.
4. The backlight module as claimed in claim 1, wherein the yellow backlight unit comprises: the array light source, be located the diffuser plate of light source light-emitting side, and be located the diffuser plate deviates from the quantum dot diaphragm of light source one side.
5. The backlight module according to claim 1, wherein the blue backlight unit comprises: a second light source and a second light guide plate; the second light source is located on one side of the light incident surface of the second light guide plate, and the optical film is located on one side of the light emergent surface of the second light guide plate.
6. The backlight module according to any one of claims 1-5, wherein the backlight module further comprises: a blue light reflecting sheet positioned between the yellow backlight unit and the blue backlight unit;
the blue light reflecting sheet is used for reflecting blue light and transmitting light with wavelength larger than that of other wave bands of the blue light.
7. A display device, comprising the backlight module as claimed in any one of claims 1 to 6 and a display panel disposed at the light exit side of the backlight module.
8. A driving method of a backlight module according to any one of claims 1-6, wherein the yellow backlight unit and the blue backlight unit in the backlight module are divided into a plurality of partitions, the driving method comprising:
receiving an image data signal; the image data signal includes: a data signal of a blue sub-pixel, a data signal of a green sub-pixel and a data signal of a red sub-pixel;
determining backlight values of the partitions of the blue backlight unit according to the data signals of the blue sub-pixels; determining backlight values of all partitions of the yellow backlight unit according to the data signals of the green sub-pixels and the data signals of the red sub-pixels;
and respectively controlling the brightness of the corresponding subarea according to the determined backlight value of each subarea of the blue backlight unit and the determined backlight value of each subarea of the yellow backlight unit.
9. The driving method as claimed in claim 8, wherein the determining the backlight value of each partition of the blue backlight unit according to the data signal of the blue sub-pixel comprises:
respectively determining the gray-scale values of the blue sub-pixels in each partition of the blue backlight unit according to the data signals of the blue sub-pixels;
respectively determining the backlight value of each subarea according to the gray-scale value of the blue sub-pixel in each subarea and a set rule;
determining the gain backlight value of each subarea according to the backlight value of each subarea and a gain curve preset by the blue backlight unit;
the determining the backlight value of each partition of the yellow backlight unit according to the data signal of the green sub-pixel and the data signal of the red sub-pixel comprises:
respectively determining the gray-scale values of the green sub-pixel and the red sub-pixel in each partition of the yellow backlight unit according to the data signal of the green sub-pixel and the data signal of the red sub-pixel;
respectively determining the backlight value of each subarea according to the gray-scale values of the green sub-pixels and the red sub-pixels in each subarea and a set rule;
and determining the gain backlight value of each subarea according to the backlight value of each subarea and a gain curve preset by the yellow backlight unit.
10. The driving method according to claim 8, wherein the controlling the brightness of the corresponding sub-area according to the determined backlight value of the sub-area of the blue backlight unit and the determined backlight value of the sub-area of the yellow backlight unit comprises:
and respectively controlling the driving current or the duty ratio of a pulse width modulation signal of the corresponding subarea according to the determined gain backlight value of each subarea of the blue backlight unit and the yellow backlight unit so as to control the brightness of each subarea.
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