CN108333833B - Color film substrate and manufacturing method thereof, display panel and display device - Google Patents
Color film substrate and manufacturing method thereof, display panel and display device Download PDFInfo
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- G—PHYSICS
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- 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
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- 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
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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
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- G02F1/133509—Filters, e.g. light shielding masks
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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
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- G02F1/1336—Illuminating devices
- G02F1/133624—Illuminating devices characterised by their spectral emissions
Abstract
The invention discloses a color film substrate, a manufacturing method thereof, a display panel and a display device, and belongs to the technical field of display. This various membrane base plate includes: a substrate base plate; the black matrix is arranged on the substrate base plate, the black matrix surrounds a plurality of sub-pixel areas distributed in an array mode on the substrate base plate, and the plurality of sub-pixel areas comprise: a plurality of red sub-pixel regions, a plurality of green sub-pixel regions, and a plurality of blue sub-pixel regions; and a target quantum dot material is arranged in each blue sub-pixel region and used for converting initial blue light emitted by the backlight source into mixed blue light, and the spectrogram of the mixed blue light has two wave peaks, wherein the initial blue light is the blue light with the peak wavelength in the range of 440-460 nanometers. By arranging the target quantum dot material, the blue primary color coordinates in the finally formed color gamut are closer to the blue primary color coordinates in the BT2020 color gamut. The invention is used in a display device.
Description
Technical Field
The invention relates to the technical field of display, in particular to a color film substrate, a manufacturing method of the color film substrate, a display panel and a display device.
Background
With the development of the display technology field, various products with display functions, such as mobile phones, tablet computers, televisions, notebook computers, digital photo frames, navigators and the like, are present in daily life, and the products are all required to be equipped with displays without exception.
Liquid Crystal Displays (LCDs) are the mainstream displays on the market, and the LCDs may generally include: the liquid crystal display panel comprises a backlight source, an array substrate, a color film substrate and a liquid crystal layer positioned between the array substrate and the color film substrate, wherein the color film substrate can comprise: the color resistance layer comprises a plurality of color filters, each color filter can only allow light of one waveband to exit, and then white light emitted by the backlight source can be converted into red light, green light or blue light, so that the LCD can display colored images. In order to improve the light extraction efficiency of the LCD, the color filter in the LCD can be manufactured by using quantum dots, so that a quantum dot display can be manufactured, and the light extraction efficiency of the quantum dot display is far higher than that of the LCD.
The color film substrate in the quantum dot display can be divided into a plurality of pixels, and each pixel can comprise: the red sub-pixel is provided with a red quantum dot material, the green sub-pixel is provided with a green quantum dot material, the blue sub-pixel is not provided with the quantum dot material, and light emitted by a backlight source in the quantum dot display is blue light. In order to improve the conversion efficiency of light, the peak wavelength range of blue light emitted by a backlight source in a quantum dot display is 440-460 nanometers (nm), and if the blue light emitted by the backlight source directly passes through a blue sub-pixel, the color gamut formed by the quantum dot display is seriously deviated from the standard BT2020 color gamut, so that the accuracy of the final displayed color of the quantum dot display is low.
Disclosure of Invention
The application provides a color film substrate, a manufacturing method thereof, a display panel and a display device, and can solve the problem that the accuracy of the final displayed color of the conventional quantum dot display is low. The technical scheme is as follows:
in a first aspect, a color filter substrate is provided, including:
a substrate base plate;
the black matrix is arranged on the substrate base plate, the black matrix surrounds a plurality of sub-pixel regions distributed in an array mode on the substrate base plate, and the plurality of sub-pixel regions comprise: a plurality of red sub-pixel regions, a plurality of green sub-pixel regions, and a plurality of blue sub-pixel regions;
a target quantum dot material is arranged in each blue sub-pixel region, the target quantum dot material is used for converting initial blue light emitted by a backlight source into mixed blue light, and a spectrogram of the mixed blue light has two wave peaks;
a red quantum dot material is arranged in each red sub-pixel region and used for converting the initial blue light into red light;
a green quantum dot material is arranged in each green sub-pixel region and used for converting the initial blue light into green light;
wherein the initial blue light is blue light with a peak wavelength in the range of 440-460 nanometers.
Optionally, in each blue sub-pixel region, a part of the initial blue light is converted into first target blue light after passing through the target quantum dot material, another part of the initial blue light can be directly transmitted from the target quantum dot material to obtain second target blue light, the first target blue light and the second target blue light can be mixed to form the mixed blue light, and the two peaks in the mixed blue light are formed by the peak structure of the first target blue light and the peak structure of the second target blue light;
wherein a peak wavelength of the second target blue light is the same as a peak wavelength of the initial blue light.
Optionally, in each blue sub-pixel region, the target quantum dot material is a blue quantum dot material, and the peak wavelength of the first target blue light is in a range of 470-490 nm;
the ratio k1 of the peak of the second target blue light to the peak of the first target blue light in the spectrogram of the mixed blue light satisfies: k1 is more than or equal to 1 and less than or equal to 2.
Optionally, in each blue sub-pixel region, the target quantum dot material is a green quantum dot material, and the peak wavelength of the first target blue light is 490 to 525 nanometers;
the ratio k2 of the peak of the second target blue light to the peak of the first target blue light in the spectrogram of the mixed blue light satisfies: k2 is more than or equal to 5 and less than or equal to 15.
Optionally, in each red sub-pixel region, the red quantum dot material is used for converting the initial blue light into red light with a peak wavelength in a range of 645 nm to 660 nm;
in each green sub-pixel region, the green quantum dot material is used for converting the initial blue light into green light with a peak wavelength in a range of 525-535 nanometers.
In a second aspect, a method for manufacturing a color filter substrate is provided, where the method includes:
forming a black matrix on a substrate, wherein the black matrix surrounds a plurality of sub-pixel regions distributed in an array on the substrate, and the plurality of sub-pixel regions comprise: a plurality of red sub-pixel regions, a plurality of green sub-pixel regions, and a plurality of blue sub-pixel regions;
forming a target quantum dot material in each blue sub-pixel region, wherein the target quantum dot material is used for converting initial blue light emitted by a backlight source into mixed blue light, and a spectrogram of the mixed blue light has two peaks;
forming red quantum dot material in each of the red sub-pixel regions, the red quantum dot material for converting the initial blue light to red light;
forming green quantum dot material in each of the green sub-pixel regions, the green quantum dot material for converting the primary blue light to green light;
wherein the initial blue light is blue light with a peak wavelength in the range of 440-460 nanometers.
In a third aspect, a display panel is provided, including: the liquid crystal display panel comprises an array substrate, a color film substrate and a liquid crystal layer positioned between the array substrate and the color film substrate, wherein the color film substrate is the color film substrate in the first aspect.
In a fourth aspect, there is provided a display device comprising: the display panel is the display panel of the third aspect, the backlight is used for emitting initial blue light with a peak wavelength range of 440-460 nanometers, and light emitted by the backlight sequentially passes through the array substrate, the liquid crystal layer and the color film substrate in the display panel and then is emitted.
Optionally, the effective coverage of the display device in a color gamut formed in a color space is greater than 90%, where the effective coverage is: in the color space, the display device forms a ratio of an overlapping area of a color gamut with a BT2020 color gamut and an area of the BT2020 color gamut.
Optionally, the peak wavelength of the blue light emitted by the backlight source is 450nm,
in each blue sub-pixel region, one part of the blue light emitted by the backlight source is converted into blue light with a peak wavelength of 470nm after passing through the target quantum dot material, the other part of the blue light emitted by the backlight source can be directly transmitted from the target quantum dot material to obtain blue light with a peak wavelength of 450nm, the blue light with a peak wavelength of 450nm and the blue light with a peak wavelength of 470nm are mixed into the mixed blue light, the peak ratio of the blue light with a peak wavelength of 450nm to the blue light with a peak wavelength of 470nm in a spectrogram of the mixed blue light is 1.3: 1,
in each red sub-pixel region, blue light emitted by the backlight source is converted into red light with the peak wavelength of 653 nanometers by the red quantum dot material,
in each green sub-pixel area, the blue light emitted by the backlight source is converted into green light with the peak wavelength of 530 nanometers by the green quantum dot material,
coordinates of red primary color of the display device in a color space are (0.5576, 0.5162), coordinates of green primary color are (0.0613, 0.5820), and coordinates of blue primary color are (0.1645, 0.1385);
or the peak wavelength of the blue light emitted by the backlight source is 450 nanometers,
in each blue sub-pixel region, one part of the blue light emitted by the backlight source is converted into the blue light with the peak wavelength of 500 nanometers after passing through the target quantum dot material, the other part of the blue light emitted by the backlight source can be directly transmitted from the target quantum dot material to obtain the blue light with the peak wavelength of 450 nanometers, the blue light with the peak wavelength of 450 nanometers and the blue light with the peak wavelength of 500 nanometers are mixed into the mixed blue light, the peak ratio of the blue light with the peak wavelength of 450 nanometers to the blue light with the peak wavelength of 500 nanometers in a spectrogram of the mixed blue light is 7.3: 1,
in each red sub-pixel region, blue light emitted by the backlight source is converted into red light with the peak wavelength of 653 nanometers by the red quantum dot material,
in each green sub-pixel area, the blue light emitted by the backlight source is converted into green light with the peak wavelength of 530 nanometers by the green quantum dot material,
the display device has coordinates of (0.5576, 0.5162) of the red primary color, coordinates of (0.0613, 0.5820) of the green primary color, and coordinates of (0.1735, 0.1485) of the blue primary color in a color space.
The technical scheme provided by the embodiment of the invention has the following beneficial effects:
according to the color film substrate and the manufacturing method thereof, the display panel and the display device provided by the embodiment of the invention, the target quantum dot material is arranged in the blue sub-pixel region, so that the phenomenon that the finally formed color gamut can be seriously deviated from the standard BT2020 color gamut because the initial blue light is directly emitted from the blue sub-pixel region is avoided, the target quantum dot material can convert the initial blue light into the mixed blue light, and the spectrogram of the mixed blue light has two peaks, so that the blue primary color coordinate in the finally formed color gamut is closer to the blue primary color coordinate in the BT2020 color gamut. And because the range of the peak wavelength of the initial blue light is 440-460 nm, the matching degree of the color gamut formed after the initial blue light passes through the color film substrate and the BT2020 color gamut can be improved under the condition of ensuring higher light conversion efficiency of the quantum dot material, and the accuracy of the final displayed color of the display device is effectively improved after the display device is formed on the color film substrate.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a quantum dot display provided in the related art;
fig. 2 is a graph comparing a color gamut formed by a quantum dot display in the related art with a BT2020 color gamut;
FIG. 3 is a graph of the effect of blue light with different peak wavelengths on the excitation efficiency of quantum dot materials provided by the related art;
fig. 4 is a schematic structural diagram of a color film substrate according to an embodiment of the present invention;
fig. 5 is a flowchart of a method for manufacturing a color filter substrate according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of a display panel according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of a display device according to an embodiment of the present invention;
FIG. 8A is a graph showing the spectra of 450nm blue light and 470nm blue light in accordance with an embodiment of the present invention;
FIG. 8B is a spectrum of a mixed blue light provided by an embodiment of the present invention;
fig. 8C is a graph comparing the color gamut formed by a display device according to an embodiment of the present invention with the BT2020 color gamut;
FIG. 9A is a spectrum of 450nm blue light and 500nm blue light according to an embodiment of the present invention;
FIG. 9B is a spectrum of another mixed blue light provided by embodiments of the present invention;
fig. 9C is a comparison graph of the color gamut formed by another display device according to the embodiment of the present invention and the BT2020 color gamut.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a quantum dot display provided in the related art, where the quantum dot display may include: the liquid crystal display panel comprises a backlight source 01, an array substrate 02, a liquid crystal layer 03 and a color film substrate 04 which are sequentially stacked, wherein the color film substrate 04 can be divided into a plurality of pixels, and each pixel can comprise: red sub-pixel 001, green sub-pixel 002 and blue sub-pixel 003, and the light emitted from the backlight 01 in the typical quantum dot display is blue light. A red quantum dot material is arranged in the red sub-pixel 001, and blue light is excited into red light by the red quantum dot material after passing through the red sub-pixel 001; a green quantum dot material is arranged in the green sub-pixel 002, and blue light is excited into green light by the green quantum dot material after passing through the green sub-pixel 002; the blue sub-pixel 003 is not provided with quantum dot material, and blue light can directly pass through the blue sub-pixel 003. When the peak wavelength of blue light emitted by the backlight source 01 is in the range of 440-460 nm, the color gamut formed by the quantum dot display can be seriously deviated from the standard BT2020 color gamut.
For example, referring to fig. 2, fig. 2 is a comparison graph of a color gamut formed by a quantum dot display in the related art and a BT2020 color gamut, and fig. 2 shows a distribution range of the BT2020 color gamut in the CIE1976 color space and a color gamut range formed by the quantum dot display in the CIE1976 color space, wherein a solid line triangle in fig. 2 represents the BT2020 color gamut, and a dotted line triangle represents the color gamut formed by the quantum dot display, in fig. 2, a color can be defined by coordinates U and V, when blue light with a peak wavelength in a range of 440 to 460nm is directly emitted from a blue subpixel, a blue color coordinate a1 formed by the quantum dot display is severely shifted from a blue primary color coordinate a2 of the BT2020, so that the color gamut formed by the quantum dot display cannot fit the BT2020, and the accuracy of the color finally displayed by the quantum dot display is low.
In the related art, in order to improve the matching degree between the color gamut formed by the quantum dot display and the BT2020 color gamut, it is required to ensure that the peak wavelength range of the blue light emitted by the backlight is 460 to 470nm, and the excitation efficiency of the blue light with the peak wavelength range of 460 to 470nm on the red quantum dot material and the green quantum dot material is lower, for example, please refer to fig. 3, fig. 3 is an effect graph of the influence of the blue light with different peak wavelengths on the excitation efficiency of the quantum dot material provided by the related art, where an abscissa in fig. 3 represents the peak wavelength of the blue light, and an ordinate represents the absorption value of the quantum dot material, and when the peak wavelength range of the blue light is 460 to 470nm, the absorption value of the quantum dot material on the blue light is smaller, which results in lower excitation efficiency of the quantum dot material, and thus results in lower conversion efficiency of the quantum dot material on the light.
Referring to fig. 4, fig. 4 is a schematic structural diagram of a color film substrate 10 according to an embodiment of the present invention, where the color film substrate 10 may include:
a substrate 11.
A black matrix 12 is disposed on the substrate 11, the black matrix 12 surrounds a plurality of sub-pixel regions distributed in an array on the substrate 11, and the plurality of sub-pixel regions may include: a plurality of red sub-pixel regions 13, a plurality of green sub-pixel regions 14, and a plurality of blue sub-pixel regions 15.
A target quantum dot material 151 is disposed in each blue sub-pixel region 15, and the target quantum dot material 151 is configured to convert the initial blue light S emitted by the backlight into a mixed blue light, where a spectrogram of the mixed blue light has two peaks, and a ratio of the peaks of the two peaks is within a preset range.
A red quantum dot material 131 is disposed in each red sub-pixel region 13, and the red quantum dot material 131 is used to convert the initial blue light S into red light.
A green quantum dot material 141 is disposed in each green sub-pixel region 14, and the green quantum dot material 141 is used to convert the original blue light S into green light.
Wherein the initial blue light S is blue light with a peak wavelength range of 440-460 nm.
In summary, in the color film substrate provided in the embodiment of the present invention, the target quantum dot material is disposed in the blue sub-pixel region, so that it is avoided that the initial blue light is directly emitted from the blue sub-pixel region, which causes the color gamut formed finally to deviate from the standard BT2020 color gamut, and the target quantum dot material can convert the initial blue light into the mixed blue light, and the spectrogram of the mixed blue light has two peaks, so that the blue-primary coordinate in the color gamut formed finally is closer to the blue-primary coordinate in the BT2020 color gamut. And because the range of the peak wavelength of the initial blue light is 440-460 nm, the matching degree of the color gamut formed after the initial blue light passes through the color film substrate and the BT2020 color gamut can be improved under the condition of ensuring higher light conversion efficiency of the quantum dot material, and the accuracy of the final displayed color of the display device is effectively improved after the display device is formed on the color film substrate.
Optionally, as shown in fig. 4, in each blue sub-pixel region 15, a part of the initial blue light S passes through the target quantum dot material 151 and then is converted into a first target blue light, another part of the initial blue light S can be directly transmitted from the target quantum dot material 151 to obtain a second target blue light, the first target blue light and the second target blue light can be mixed to form a mixed blue light, and two peaks of the mixed blue light are formed by a peak of the first target blue light and a peak of the second target blue light. In the embodiment of the present invention, the concentration of the target quantum dot material 151 disposed in each blue sub-pixel region 15 in the color film substrate 10 is low, so that only a part of the initial blue light S can be excited by the target quantum dot material 151, the excited initial blue light S is converted into the first target blue light, and the other part of the initial blue light S cannot be excited by the target quantum dot material 151, so that the second target blue light can be directly obtained by transmitting from the target quantum dot material 151. Since the second target blue light is not excited by the target quantum dot material 151, the peak wavelength of the second target blue light is the same as the peak wavelength of the initial blue light.
In practical application, because target quantum dot materials of different materials can convert initial blue light into mixed blue light, there are various realizable ways to convert initial blue light into mixed blue light in the embodiment of the present invention, and the following embodiments are schematically illustrated by taking two realizable ways as examples:
in a first implementation manner, when the target quantum dot material is a blue quantum dot material, in each blue sub-pixel region, the peak wavelength of the first target blue light is in a range of 470-490 nm; the ratio k1 of the peak of the second target blue light to the peak of the first target blue light (i.e. the ratio of the peak of the second target blue light to the peak of the first target blue light) in the spectrogram of the mixed blue light satisfies: k1 is more than or equal to 1 and less than or equal to 2.
In a second implementation manner, when the target quantum dot material is a green quantum dot material, in each blue sub-pixel region, the peak wavelength of the first target blue light is in a range of 490-525 nm; k2 of the ratio of the peak of the second target blue light to the peak of the first target blue light in the spectrogram of the mixed blue light satisfies: k2 is more than or equal to 5 and less than or equal to 15.
In the two implementation modes, after the initial blue light passes through the color film substrate, the blue primary color coordinate in the formed color gamut can be ensured to be closer to the blue primary color coordinate in the BT2020 color gamut.
In the embodiment of the invention, in order to ensure that a red base color coordinate in a color gamut formed after the original blue light passes through a color film substrate is closer to a red base color coordinate in a BT2020 color gamut, in each red sub-pixel region, a red quantum dot material is used for converting the original blue light into red light with a peak wavelength range of 645-660 nm; in order to ensure that a green primary color coordinate in a color gamut formed after the original blue light passes through the color film substrate is closer to a red primary color coordinate in the BT2020 color gamut, a green quantum dot material is used for converting the original blue light into green light with a peak wavelength range of 525-535 nm in each green sub-pixel region.
At this time, the effective coverage of the color gamut formed after the initial blue light passes through the color film substrate can be ensured to be more than 90%, and the effective coverage is the ratio of the overlapping area of the color gamut formed after the initial blue light passes through the color film substrate and the BT2020 color gamut to the area of the BT2020 color gamut.
In summary, in the color film substrate provided in the embodiment of the present invention, the target quantum dot material is disposed in the blue sub-pixel region, so that it is avoided that the initial blue light is directly emitted from the blue sub-pixel region, which causes the color gamut formed finally to deviate from the standard BT2020 color gamut, and the target quantum dot material can convert the initial blue light into the mixed blue light, and the spectrogram of the mixed blue light has two peaks, so that the blue-primary coordinate in the color gamut formed finally is closer to the blue-primary coordinate in the BT2020 color gamut. And because the range of the peak wavelength of the initial blue light is 440-460 nm, the matching degree of the color gamut formed after the initial blue light passes through the color film substrate and the BT2020 color gamut can be improved under the condition of ensuring higher light conversion efficiency of the quantum dot material, and the accuracy of the final displayed color of the display device is effectively improved after the display device is formed on the color film substrate.
An embodiment of the present invention provides a method for manufacturing a color filter substrate, as shown in fig. 5, fig. 5 is a flowchart of a method for manufacturing a color filter substrate according to an embodiment of the present invention, where the method is used for manufacturing the color filter substrate 10 shown in fig. 4, and the method may include:
The black matrix is surrounded into a plurality of sub-pixel regions of array distribution on the substrate base plate, and the plurality of sub-pixel regions comprise: a plurality of red sub-pixel regions, a plurality of green sub-pixel regions, and a plurality of blue sub-pixel regions.
Alternatively, the black matrix may be made of a light-shielding resin material, a metal material, an alloy material, or the like having a light-shielding property.
For example, a black matrix thin film may be formed on a substrate by any one of a plurality of methods such as deposition, coating, sputtering, and the like, and then a black matrix may be formed by performing a single patterning process on the black matrix thin film, and the single patterning process may include: photoresist coating, exposure, development, etching and photoresist stripping.
The target quantum dot material is used for converting initial blue light into mixed blue light, the spectrogram of the mixed blue light has two peaks, and the ratio of the peaks of the two peaks is within a preset range. The initial blue light is blue light with the peak wavelength ranging from 440 nm to 460 nm.
Optionally, the target quantum dot material may be a blue quantum dot material or a green quantum dot material, and the principle may refer to the corresponding content in the above embodiments, which is not described herein again.
For example, the target quantum dot material, the alkali-soluble resin, the solvent, the dispersant and the additive may be uniformly mixed according to a preset ratio to obtain a quantum dot resin mixture; coating the quantum dot resin mixture on a substrate formed with a black matrix to form a quantum dot resin mixture layer; pre-baking the quantum dot resin mixture layer; performing a one-time patterning process on the pre-baked resin mixture layer, the one-time patterning process may include: coating, exposing, developing, etching and stripping photoresist; and finally, carrying out post-baking treatment, so that a target quantum dot material can be formed in each blue sub-pixel region.
The red quantum dot material is used to convert the original blue light into red light.
For example, a red quantum dot material, an alkali-soluble resin, a solvent, a dispersant and an additive may be uniformly mixed according to a preset ratio to obtain a quantum dot resin mixture; coating the quantum dot resin mixture on a substrate formed with a black matrix to form a quantum dot resin mixture layer; pre-baking the quantum dot resin mixture layer; performing a one-time patterning process on the pre-baked resin mixture layer, the one-time patterning process may include: coating, exposing, developing, etching and stripping photoresist; and finally, performing post-baking treatment, so that red quantum dot materials can be formed in each red sub-pixel region.
Step 504 forms green quantum dot material in each green sub-pixel region.
The green quantum dot material is used to convert the primary blue light into green light.
For example, a green quantum dot material, an alkali-soluble resin, a solvent, a dispersant and an additive may be uniformly mixed according to a preset ratio to obtain a quantum dot resin mixture; coating the quantum dot resin mixture on a substrate formed with a black matrix to form a quantum dot resin mixture layer; pre-baking the quantum dot resin mixture layer; performing a one-time patterning process on the pre-baked resin mixture layer, the one-time patterning process may include: coating, exposing, developing, etching and stripping photoresist; and finally, carrying out post-baking treatment, so that a green quantum dot material can be formed in each green sub-pixel area.
In summary, in the manufacturing method of the color filter substrate provided in the embodiment of the present invention, the target quantum dot material is formed in the blue sub-pixel region, so that it is avoided that the initial blue light is directly emitted from the blue sub-pixel region, which causes the color gamut formed finally to deviate from the standard BT2020 color gamut, and the target quantum dot material can convert the initial blue light into the mixed blue light, and the spectrogram of the mixed blue light has two peaks, so that the blue primary color coordinate in the color gamut formed finally is closer to the blue primary color coordinate in the BT2020 color gamut. And because the range of the peak wavelength of the initial blue light is 440-460 nm, the matching degree of the color gamut formed after the initial blue light passes through the color film substrate and the BT2020 color gamut can be improved under the condition of ensuring higher light conversion efficiency of the quantum dot material, and the accuracy of the final displayed color of the display device is effectively improved after the display device is formed on the color film substrate.
Referring to fig. 6, fig. 6 is a schematic structural diagram of a display panel 00 according to an embodiment of the present invention, where the display panel 00 may include: the liquid crystal display panel includes an array substrate 20, a color filter substrate 10, and a liquid crystal layer 30 located between the array substrate 20 and the color filter substrate 10, where the color filter substrate 20 may be the color filter substrate 20 shown in fig. 4.
Referring to fig. 7, fig. 7 is a schematic structural diagram of a display device according to an embodiment of the present invention, where the display device includes: the display panel 00 can be the display panel 00 shown in fig. 6, the backlight 40 is configured to emit initial blue light with a peak wavelength in a range of 440-460 nm, and light emitted by the backlight 40 sequentially passes through the array substrate 20, the liquid crystal layer 30 and the color film substrate 10 in the display panel 00 and then is emitted.
Optionally, the effective coverage of the display device in the color gamut formed in the color space is above 90%. In practical applications, since the target quantum dot material in the blue sub-pixel region in the display device may be a blue quantum dot material or a green quantum dot material, the following embodiments respectively exemplify two implementation manners to ensure that the effective coverage of the color gamut formed by the display device provided by the embodiments of the present invention reaches 90% or more.
In a first implementation, the peak wavelength of the blue light emitted by the backlight may be 450 nm.
When the target quantum dot material can be a blue quantum dot material, in each blue sub-pixel region, a part of blue light emitted by the backlight source is converted into blue light with a peak wavelength of 470nm after passing through the target quantum dot material, and the other part of the blue light emitted by the backlight source can be directly transmitted from the target quantum dot material to obtain blue light with a wavelength of 450 nm. For example, referring to fig. 8A and 8B, fig. 8A is a spectrum diagram of blue light at 450nm and blue light at 470nm according to an embodiment of the present invention, fig. 8B is a spectrum diagram of mixed blue light according to an embodiment of the present invention, the blue light at 450nm and the blue light at 470nm in fig. 8A can be mixed into the mixed blue light in fig. 8B, the mixed blue light has two peaks in the spectrum diagram, and the peak ratio of the blue light at 450nm to the blue light at 470nm in the spectrum diagram of the mixed blue light is 1.3: 1.
In each red sub-pixel region, blue light emitted by the backlight is converted into red light with the peak wavelength of 653nm by the red quantum dot material.
In each green sub-pixel region, blue light emitted by the backlight is converted into green light with a peak wavelength of 530nm by the green quantum dot material.
At this time, the display device has coordinates of the red primary color of (0.5576, 0.5162), coordinates of the green primary color of (0.0613, 0.5820), and coordinates of the blue primary color of (0.1645, 0.1385) in the color space.
The color space may be a CIE1976 color space, for example, please refer to fig. 8C, fig. 8C is a comparison graph of a color gamut formed by a display device according to an embodiment of the present invention and a BT2020 color gamut, wherein a solid line triangle in fig. 8C represents the BT2020 color gamut, a dotted line triangle represents the color gamut formed by the display device, and for the BT2020 color gamut, coordinates of red primaries in the color space are (0.5570, 0.5170), coordinates of green primaries are (0.0560, 0.5870), coordinates of blue primaries are (0.1590, 0.1260), coordinates of three primaries of the color gamut formed by the display device are relatively close to coordinates of three primaries of the BT2020 color gamut, and at this time, an effective coverage rate of the color gamut formed by the display device is 95.1%.
In a second implementation, the peak wavelength of the blue light emitted by the backlight may be 450 nm.
When the target quantum dot material can be a green quantum dot material, in each blue sub-pixel region, one part of blue light emitted by the backlight source is converted into blue light with the peak wavelength of 500nm after passing through the target quantum dot material, and the other part of the blue light emitted by the backlight source can be directly transmitted from the target quantum dot material to obtain the blue light with the wavelength of 450 nm. For example, referring to fig. 9A and 9B, fig. 9A is a spectrum diagram of blue light of 450nm and blue light of 500nm provided by an embodiment of the present invention, fig. 9B is a spectrum diagram of another mixed blue light provided by an embodiment of the present invention, the blue light of 450nm and the blue light of 500nm in fig. 9A can be mixed into the mixed blue light in fig. 9B, the mixed blue light has two peaks in the spectrum diagram, and the peak ratio of the blue light of 450nm to the blue light of 500nm in the spectrum diagram of the mixed blue light is 7.3: 1.
In each red sub-pixel region, blue light emitted by the backlight is converted into red light with the peak wavelength of 653nm by the red quantum dot material.
In each green sub-pixel region, blue light emitted by the backlight is converted into green light with a peak wavelength of 530nm by the green quantum dot material.
At this time, the display device has coordinates of the red primary color of (0.5576, 0.5162), coordinates of the green primary color of (0.0613, 0.5820), and coordinates of the blue primary color of (0.1735, 0.1485) in the color space.
The color space may be a CIE1976 color space, for example, please refer to fig. 9C, fig. 9C is a comparison graph of a color gamut formed by another display device according to an embodiment of the present invention and a BT2020 color gamut, wherein a solid line triangle in fig. 9C represents the BT2020 color gamut, a dotted line triangle represents the color gamut formed by the display device, and for the BT2020 color gamut, coordinates of red primaries in the color space are (0.5570, 0.5170), coordinates of green primaries are (0.0560, 0.5870), coordinates of blue primaries are (0.1590, 0.1260), coordinates of three primaries of the color gamut formed by the display device are relatively close to coordinates of three primaries of the BT2020 color gamut, and at this time, an effective coverage rate of the color gamut formed by the display device is 93%.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (9)
1. A color film substrate is characterized by comprising:
a substrate base plate;
the black matrix is arranged on the substrate base plate, the black matrix surrounds a plurality of sub-pixel regions distributed in an array mode on the substrate base plate, and the plurality of sub-pixel regions comprise: a plurality of red sub-pixel regions, a plurality of green sub-pixel regions, and a plurality of blue sub-pixel regions;
a target quantum dot material is arranged in each blue sub-pixel region, the target quantum dot material is used for converting one part of initial blue light emitted by a backlight source into first target blue light and transmitting the other part of the initial blue light to obtain second target blue light, the first target blue light and the second target blue light are mixed into mixed blue light, two peaks are arranged in a spectrogram of the mixed blue light, the target quantum dot material is a blue quantum dot material, the range of the peak wavelength of the first target blue light is 470-490 nanometers, and the ratio k1 of the peak of the second target blue light to the peak of the first target blue light in the spectrogram of the mixed blue light meets the following requirements: k1 is more than or equal to 1 and less than or equal to 2;
a red quantum dot material is arranged in each red sub-pixel region and used for converting the initial blue light into red light;
a green quantum dot material is arranged in each green sub-pixel region and used for converting the initial blue light into green light;
wherein the initial blue light is blue light with a peak wavelength in the range of 440-460 nanometers.
2. The color filter substrate of claim 1,
in each of the blue sub-pixel regions, a peak of the first target blue light and a peak of the second target blue light constitute the two peaks in the mixed blue light;
wherein a peak wavelength of the second target blue light is the same as a peak wavelength of the initial blue light.
3. The color filter substrate of claim 2,
in each blue sub-pixel region, the target quantum dot material is a green quantum dot material, and the peak wavelength range of the first target blue light is 490-525 nanometers;
the ratio k2 of the peak of the second target blue light to the peak of the first target blue light in the spectrogram of the mixed blue light satisfies: k2 is more than or equal to 5 and less than or equal to 15.
4. The color filter substrate according to any one of claims 1 to 3,
in each red sub-pixel region, the red quantum dot material is used for converting the initial blue light into red light with a peak wavelength in a range of 645-660 nanometers;
in each green sub-pixel region, the green quantum dot material is used for converting the initial blue light into green light with a peak wavelength in a range of 525-535 nanometers.
5. A manufacturing method of a color film substrate is characterized by comprising the following steps:
forming a black matrix on a substrate, wherein the black matrix surrounds a plurality of sub-pixel regions distributed in an array on the substrate, and the plurality of sub-pixel regions comprise: a plurality of red sub-pixel regions, a plurality of green sub-pixel regions, and a plurality of blue sub-pixel regions;
forming a target quantum dot material in each blue sub-pixel region, wherein the target quantum dot material is used for converting one part of initial blue light emitted by a backlight source into first target blue light and transmitting the other part of the initial blue light to obtain second target blue light, the first target blue light and the second target blue light are mixed into mixed blue light, a spectrogram of the mixed blue light has two peaks, the target quantum dot material is a blue quantum dot material, the range of the peak wavelength of the first target blue light is 470-490 nanometers, and the ratio k1 of the peak of the second target blue light to the peak of the first target blue light in the spectrogram of the mixed blue light meets the following requirements: k1 is more than or equal to 1 and less than or equal to 2;
forming red quantum dot material in each of the red sub-pixel regions, the red quantum dot material for converting the initial blue light to red light;
forming green quantum dot material in each of the green sub-pixel regions, the green quantum dot material for converting the primary blue light to green light;
wherein the initial blue light is blue light with a peak wavelength in the range of 440-460 nanometers.
6. A display panel, comprising: the liquid crystal display panel comprises an array substrate, a color film substrate and a liquid crystal layer positioned between the array substrate and the color film substrate, wherein the color film substrate is the color film substrate in any one of claims 1 to 4.
7. A display device, comprising: the display panel is the display panel as claimed in claim 6, the backlight is used for emitting initial blue light with a peak wavelength ranging from 440 nm to 460nm, and light emitted by the backlight sequentially passes through the array substrate, the liquid crystal layer and the color film substrate in the display panel and then is emitted.
8. The display device according to claim 7,
the display device has an effective coverage rate of 90% or more in a color gamut formed in a color space, the effective coverage rate being: in the color space, the display device forms a ratio of an overlapping area of a color gamut with a BT2020 color gamut and an area of the BT2020 color gamut.
9. The display device according to claim 8,
the peak wavelength of the blue light emitted by the backlight is 450nm,
in each blue sub-pixel region, one part of the blue light emitted by the backlight source is converted into blue light with a peak wavelength of 470nm after passing through the target quantum dot material, the other part of the blue light emitted by the backlight source can be directly transmitted from the target quantum dot material to obtain blue light with a peak wavelength of 450nm, the blue light with a peak wavelength of 450nm and the blue light with a peak wavelength of 470nm are mixed into the mixed blue light, the peak ratio of the blue light with a peak wavelength of 450nm to the blue light with a peak wavelength of 470nm in a spectrogram of the mixed blue light is 1.3: 1,
in each red sub-pixel region, blue light emitted by the backlight source is converted into red light with the peak wavelength of 653 nanometers by the red quantum dot material,
in each green sub-pixel area, the blue light emitted by the backlight source is converted into green light with the peak wavelength of 530 nanometers by the green quantum dot material,
coordinates of red primary color of the display device in a color space are (0.5576, 0.5162), coordinates of green primary color are (0.0613, 0.5820), and coordinates of blue primary color are (0.1645, 0.1385);
or the peak wavelength of the blue light emitted by the backlight source is 450 nanometers,
in each blue sub-pixel region, one part of the blue light emitted by the backlight source is converted into the blue light with the peak wavelength of 500 nanometers after passing through the target quantum dot material, the other part of the blue light emitted by the backlight source can be directly transmitted from the target quantum dot material to obtain the blue light with the peak wavelength of 450 nanometers, the blue light with the peak wavelength of 450 nanometers and the blue light with the peak wavelength of 500 nanometers are mixed into the mixed blue light, the peak ratio of the blue light with the peak wavelength of 450 nanometers to the blue light with the peak wavelength of 500 nanometers in a spectrogram of the mixed blue light is 7.3: 1,
in each red sub-pixel region, blue light emitted by the backlight source is converted into red light with the peak wavelength of 653 nanometers by the red quantum dot material,
in each green sub-pixel area, the blue light emitted by the backlight source is converted into green light with the peak wavelength of 530 nanometers by the green quantum dot material,
the display device has coordinates of (0.5576, 0.5162) of the red primary color, coordinates of (0.0613, 0.5820) of the green primary color, and coordinates of (0.1735, 0.1485) of the blue primary color in a color space.
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| CN201810190600.7A CN108333833B (en) | 2018-03-08 | 2018-03-08 | Color film substrate and manufacturing method thereof, display panel and display device |
| PCT/CN2018/090000 WO2019169773A1 (en) | 2018-03-08 | 2018-06-05 | Color filter substrate and manufacturing method therefor, display panel, and display device |
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| GB201810774D0 (en) * | 2018-06-29 | 2018-08-15 | Barco Nv | Display with quantum dot or quantum platelet converter |
| CN109065740A (en) | 2018-08-10 | 2018-12-21 | 京东方科技集团股份有限公司 | Oled display substrate and preparation method thereof, display device |
| CN109148673A (en) | 2018-08-31 | 2019-01-04 | 京东方科技集团股份有限公司 | Quantum dot film, quantum dot light emitting component and display device |
| CN109509428B (en) | 2019-01-07 | 2021-01-08 | 京东方科技集团股份有限公司 | Pixel driving circuit, pixel driving method and display device |
| CN110211491B (en) * | 2019-06-05 | 2021-05-14 | 京东方科技集团股份有限公司 | Color film substrate, display panel and preparation method of display panel |
| CN114373848B (en) * | 2021-01-27 | 2023-04-07 | 昆山麦沄显示技术有限公司 | LED chip and manufacturing method thereof |
| CN115331638B (en) * | 2021-05-10 | 2023-10-20 | 宏碁股份有限公司 | Display panel, operation method thereof and sub-pixel |
| CN113655658A (en) * | 2021-07-27 | 2021-11-16 | 荣耀终端有限公司 | Backlight source, manufacturing method thereof, display device and electronic equipment |
| CN115275051B (en) * | 2022-07-21 | 2023-11-07 | 武汉华星光电半导体显示技术有限公司 | Display panel and display device |
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