CN111240073A - Display panel, manufacturing method thereof and display device - Google Patents
Display panel, manufacturing method thereof and display device Download PDFInfo
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- CN111240073A CN111240073A CN202010090807.4A CN202010090807A CN111240073A CN 111240073 A CN111240073 A CN 111240073A CN 202010090807 A CN202010090807 A CN 202010090807A CN 111240073 A CN111240073 A CN 111240073A
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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
- G02F1/1334—Constructional arrangements; Manufacturing methods based on polymer dispersed liquid crystals, e.g. microencapsulated liquid crystals
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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
- G02F1/13306—Circuit arrangements or driving methods for the control of single liquid crystal cells
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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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Abstract
The invention discloses a display panel, a manufacturing method thereof and a display device, comprising the following steps: a display substrate having a plurality of sub-pixel units, a light regulating structure located above each sub-pixel unit; wherein, light regulation and control structure includes: a first polymer dispersed liquid crystal layer and a driving unit; a first polymer dispersed liquid crystal layer comprising: a polymer network having a first mesh, and liquid crystal molecules dispersed in the polymer network; the diameter of the first mesh which is overlapped with each sub-pixel unit in the direction vertical to the display substrate is in a negative correlation with the luminous efficiency attenuation amplitude of the sub-pixel unit; the driving unit is configured to adjust a voltage applied to the first polymer dispersed liquid crystal layer according to a temperature. By arranging the light regulation and control structure, the difference of the luminous efficiency of each sub-pixel unit generated along with the temperature change is compensated, and the consistent trend of the brightness change of each sub-pixel unit along with the temperature change is ensured, so that the phenomena of low-temperature bluing and high-temperature powdering are improved.
Description
Technical Field
The invention relates to the technical field of display, in particular to a display panel, a manufacturing method thereof and a display device.
Background
With the popularization of the internet and the continuous development of display technology, high-quality display panels have become an important feature of many electronic consumer products. Compared with a liquid crystal molecular display panel, the organic electroluminescent display panel has the advantages of self luminescence, low energy consumption, low production cost, wide viewing angle, high contrast, high response speed, more vivid color display, easier realization of lightness, thinness, flexibility and the like. At present, in the display fields of mobile phones, digital cameras, computers, personal digital assistants and the like, organic electroluminescent display panels have begun to replace the traditional liquid crystal molecular display panels, and are expected to become the mainstream choice of next generation display panels.
With the change of temperature, the change range of monochromatic light emitted by the red, green and blue sub-pixel units in the organic electroluminescent display panel is different, so that white light at room temperature is green under the condition of being lower than the room temperature, and is powdered under the condition of being higher than the room temperature.
Disclosure of Invention
In view of the above, embodiments of the present invention provide a display panel, a manufacturing method thereof and a display device, so as to improve the phenomena of low-temperature bluing and high-temperature powdering of an organic electroluminescent display panel.
Therefore, an embodiment of the present invention provides a display panel, including: the display device comprises a display substrate with a plurality of sub-pixel units, and a light regulation structure positioned on each sub-pixel unit;
wherein, light regulation and control structure includes: a first polymer dispersed liquid crystal layer and a driving unit;
the first polymer dispersed liquid crystal layer includes: a polymer network having a first mesh, and liquid crystal molecules dispersed in the polymer network;
in the direction vertical to the display substrate, the diameter of the first mesh which is mutually overlapped with each sub-pixel unit is in a negative correlation with the luminous efficiency attenuation amplitude of the sub-pixel unit;
the driving unit is configured to adjust a voltage applied to the first polymer dispersed liquid crystal layer according to a temperature.
In a possible implementation manner, in the display panel provided in an embodiment of the present invention, the sub-pixel unit includes: the pixel structure comprises a red sub-pixel unit, a green sub-pixel unit and a blue sub-pixel unit;
the first mesh overlapping the green sub-pixel unit, the first mesh overlapping the red sub-pixel unit, and the first mesh overlapping the blue sub-pixel unit decrease in order.
In a possible implementation manner, in the display panel provided in the embodiment of the present invention, the display panel further includes: a second polymer dispersed liquid crystal layer located over a region where the gap between the sub-pixel units is located;
the second polymer dispersed liquid crystal layer includes: the polymer network having a second mesh, and the liquid crystal molecules dispersed in the polymer network.
In a possible implementation manner, in the display panel provided by the embodiment of the present invention, the first polymer dispersed liquid crystal layer and the second polymer dispersed liquid crystal layer are an integral structure.
In a possible implementation manner, in the display panel provided in an embodiment of the present invention, the driving unit includes: the driving chip, the negative temperature coefficient temperature control resistor, and the first transparent electrode and the second transparent electrode which are positioned at two sides of the first polymer dispersed liquid crystal layer;
the second transparent electrode, the driving chip, the negative temperature coefficient temperature control resistor and the first transparent electrode are electrically connected in sequence.
Based on the same inventive concept, the embodiment of the invention also provides a display device, which comprises the display panel.
Based on the same inventive concept, the embodiment of the invention also provides a manufacturing method of the display panel, which comprises the following steps:
providing a display substrate with a plurality of sub-pixel units;
forming a light regulation structure which is overlapped with each sub-pixel unit on the display substrate; the light ray regulation and control structure includes: a first polymer dispersed liquid crystal layer and a driving unit;
the first polymer dispersed liquid crystal layer includes: a polymer network having a first mesh, and liquid crystal molecules dispersed in the polymer network;
in the direction vertical to the display substrate, the diameter of the first mesh which is mutually overlapped with each sub-pixel unit is in a negative correlation with the luminous efficiency attenuation amplitude of the sub-pixel unit;
the driving unit is configured to adjust a voltage applied to the first polymer dispersed liquid crystal layer according to a temperature.
In a possible implementation manner, in the manufacturing method provided by the embodiment of the present invention, the sub-pixel unit includes: the red sub-pixel unit, the green sub-pixel unit and the blue sub-pixel unit form a first polymer dispersed liquid crystal layer, and the method specifically comprises the following steps:
using 1mW/cm2The ultraviolet area light source and the evaporation mask plate of the green sub-pixel process the liquid crystal mixture above the green sub-pixel for 5 min;
using 0.8mW/cm2The ultraviolet area light source and the evaporation mask plate of the red sub-pixel process the liquid crystal mixture above the red sub-pixel for 4 min;
using 0.6mW/cm2The ultraviolet area light source and the evaporation mask plate of the blue sub-pixel process the liquid crystal mixture above the blue sub-pixel for 3 min;
the liquid crystal mixture comprises: more than 70% and less than 100% of negative dielectric anisotropy liquid crystal molecules, more than 0 and less than 10% of polyethylene glycol methyl ether methacrylate, more than 0 and less than 10% of 1, 3-butanediol diacrylate, more than 0 and less than 10% of neopentyl glycol diacrylate, more than 0 and less than 10% of trimethylolpropane triacrylate, more than 0 and less than 1% of 2,4, 6-trimethylformylphenyl ethyl phosphate and more than 0 and less than 1% of 2-hydroxy-2-methyl propiophenone;
the first mesh diameter of the polymer network overlapping the green sub-pixel is 1 μm to 3 μm, the first mesh diameter of the polymer network overlapping the red sub-pixel is 3 μm to 5 μm, and the first mesh diameter of the polymer network overlapping the blue sub-pixel is 5 μm to 8 μm.
In a possible implementation manner, in the above manufacturing method provided by the embodiment of the present invention, the liquid crystal mixture includes: 79.6 mass percent of negative dielectric anisotropy liquid crystal molecules, 5.3 mass percent of polyethylene glycol methyl ether methacrylate, 6.7 mass percent of 1, 3-butanediol diacrylate, 4.7 mass percent of neopentyl glycol diacrylate, 3.9 mass percent of trimethylolpropane triacrylate, 0.2 mass percent of 2,4, 6-trimethylformylphenyl ethyl phosphate and 0.2 mass percent of 2-hydroxy-2-methyl propiophenone.
In a possible implementation manner, in the manufacturing method provided by the embodiment of the present invention, after the forming the first polymer dispersed liquid crystal layer, the method further includes:
using 0.6mW/cm2The liquid crystal mixture is processed for 5min to obtain a second polymer dispersed liquid crystal layer having second meshes over a region where a gap between the sub-pixel units is located.
The invention has the following beneficial effects:
the display panel, the manufacturing method thereof and the display device provided by the embodiment of the invention comprise the following steps: a display substrate having a plurality of sub-pixel units, a light regulating structure located above each sub-pixel unit; wherein, light regulation and control structure includes: a first polymer dispersed liquid crystal layer and a driving unit; a first polymer dispersed liquid crystal layer comprising: a polymer network having a first mesh, and liquid crystal molecules dispersed in the polymer network; the diameter of the first mesh which is overlapped with each sub-pixel unit in the direction vertical to the display substrate is in a negative correlation with the luminous efficiency attenuation amplitude of the sub-pixel unit; the driving unit is configured to adjust a voltage applied to the first polymer dispersed liquid crystal layer according to a temperature. The smaller the first mesh of the polymer network is, the stronger the constraint effect on the liquid crystal molecules is, and the less the liquid crystal molecules are deflected under the same electric field condition; on the contrary, the larger the first mesh of the polymer network is, the weaker the binding effect on the liquid crystal molecules is, and the liquid crystal molecules are easier to deflect under the same electric field condition; therefore, under the condition that the diameter of the first mesh which is mutually overlapped with each sub-pixel unit and the luminous efficiency attenuation amplitude of the sub-pixel unit are in a negative correlation relation, the driving unit adjusts the voltage loaded on the first polymer dispersed liquid crystal layer by responding to the temperature change, so that the light transmittance of liquid crystal molecules above each sub-pixel unit is changed, specifically, the smaller the diameter of the first mesh is, the more the liquid crystal molecules transmit the emitted light of the sub-pixel unit overlapped with the first mesh, the difference of the luminous efficiency of each sub-pixel unit along with the temperature change is compensated, the consistent brightness change trend of each sub-pixel unit along with the temperature change is ensured, and the phenomena of low-temperature bluing and high-temperature powdering are improved.
Drawings
Fig. 1 is a schematic structural diagram of a light ray regulation structure according to an embodiment of the present invention;
FIG. 2 is a graph showing the luminous efficiency of each sub-pixel unit at different temperatures in the related art;
FIG. 3 is an electron micrograph of a polymer network overlapping a green sub-pixel element in an embodiment of the invention;
FIG. 4 is an electron micrograph of a polymer network overlapping a red subpixel unit in an embodiment of the present invention;
FIG. 5 is an electron micrograph of a polymer network overlapping a blue subpixel unit in an embodiment of the present invention;
FIG. 6 is a graph of transmittance of the first polymer dispersed liquid crystal layer with each sub-pixel unit overlapped under different voltages in the embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the drawings of the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the invention without any inventive step, are within the scope of protection of the invention.
Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs. The use of "first," "second," and similar terms in the description and in the claims does not indicate any order, quantity, or importance, but rather is used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items. "inner", "outer", "upper", "lower", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships may also be changed accordingly.
An embodiment of the present invention provides a display panel, as shown in fig. 1, including: a display substrate (not shown) having a plurality of sub-pixel units, a light modulating structure 001 located above each sub-pixel unit;
wherein, light regulation and control structure 001 includes: a first polymer dispersed liquid crystal layer 101 and a driving unit 102;
a first polymer dispersed liquid crystal layer 101 including: a polymer network having a first mesh, and liquid crystal molecules dispersed in the polymer network;
the diameter of the first mesh which is overlapped with each sub-pixel unit in the direction vertical to the display substrate is in a negative correlation with the luminous efficiency attenuation amplitude of the sub-pixel unit;
the driving unit 102 is configured to adjust a voltage applied to the first polymer dispersed liquid crystal layer 101 according to a temperature.
In the display panel provided by the embodiment of the invention, the smaller the first mesh of the polymer network is, the stronger the constraint effect on the liquid crystal molecules is, and the less the liquid crystal molecules are deflected under the same electric field condition; on the contrary, the larger the first mesh of the polymer network is, the weaker the binding effect on the liquid crystal molecules is, and the liquid crystal molecules are easier to deflect under the same electric field condition; therefore, under the condition that the diameter of the first mesh overlapping each sub-pixel unit is in a negative correlation with the attenuation amplitude of the luminous efficiency of the sub-pixel unit, the driving unit 102 adjusts the voltage applied to the first polymer dispersed liquid crystal layer 101 in response to the temperature change, so that the light transmittance of the liquid crystal molecules above each sub-pixel unit is changed, specifically, the smaller the diameter of the first mesh is, the more the light emitted by the liquid crystal molecules through the sub-pixel unit overlapped with the first mesh is, thereby compensating the difference of the luminous efficiency of each sub-pixel unit caused by the temperature change, ensuring the consistent trend of the brightness change of each sub-pixel unit caused by the temperature change, improving the phenomena of low-temperature bluing and high-temperature powdering, and providing the display effect.
In the related art, the difference of the luminous efficiency of the organic electroluminescent device (OLED) at different temperatures is large, especially the luminous efficiency of the green OLED decreases very obviously with the increase of the temperature, the luminous efficiency changes by more than 20% from-20 ℃ to 80 ℃, the luminous efficiency of the blue OLED and the red OLED also changes to a certain extent, but the change amplitude of the red OLED is smaller than that of the green OLED, and the blue OLED is smaller, as shown in fig. 2. And the green OLED contributes most to the brightness (60% -75%), the variation of the luminous efficiency of the green OLED seriously affects the color at different temperatures.
In view of this, in the display panel provided in the embodiment of the present invention, the sub-pixel unit includes: in the case of the red, green and blue sub-pixel units R, G and B, in order to effectively compensate for the difference in luminous efficiency of the sub-pixel units with temperature variation, the first mesh overlapping the green sub-pixel unit G (as shown in fig. 3), the first mesh overlapping the red sub-pixel unit R (as shown in fig. 4), and the first mesh overlapping the blue sub-pixel unit B (as shown in fig. 5) may be sequentially decreased.
The first mesh in the polymer network may anchor the liquid crystal molecules. The larger the polymer mesh is, the weaker the anchoring effect on liquid crystal molecules is, the easier the liquid crystal molecules are to deflect and the less easy the liquid crystal molecules are to transmit light; the smaller the polymer mesh, the stronger the anchoring effect on the liquid crystal molecules, and the less the liquid crystal molecules are deflected and the more light is transmitted. Therefore, when the first mesh overlapping the green sub-pixel unit G, the first mesh overlapping the red sub-pixel unit R, and the first mesh overlapping the blue sub-pixel unit B are sequentially decreased, the decrease width of the light transmittance of the light emitted from the green sub-pixel unit G, the red sub-pixel unit R, and the blue sub-pixel unit B by the first polymer dispersed liquid crystal layer 101 is sequentially decreased (as shown in fig. 6), thereby canceling the difference in the light emission efficiency attenuation of the green sub-pixel unit G, the red sub-pixel unit R, and the blue sub-pixel unit B caused by the temperature increase. The luminous efficiency attenuation balance of the green sub-pixel unit G, the red sub-pixel unit R and the blue sub-pixel unit B along with the temperature rise is realized, and the green and powder emitting conditions at low temperature and high temperature are improved.
Optionally, in the display panel provided in the embodiment of the present invention, as shown in fig. 1, the display panel may further include: a second polymer dispersed liquid crystal layer 103 on a region where the gap between the sub-pixel units is located;
a second polymer dispersed liquid crystal layer 103 including: a polymer network having a second mesh, and liquid crystal molecules dispersed in the polymer network.
In the related art, the display substrate includes a Pixel Definition Layer (PDL) having a plurality of openings, each of which is provided with a sub-pixel unit. Therefore, the region where the gap between the sub-pixel units is located is the region above the Pixel Definition Layer (PDL). By providing the second polymer dispersed liquid crystal layer 103 having the second mesh in the region where the gap between the sub-pixel units is located, it is possible to effectively restrict the polymer network overlapping with the sub-pixel units from greatly moving.
In addition, it is understood that the smaller the second mesh in the second polymer dispersed liquid crystal layer 103, the better the definition effect of the polymer network overlapping each sub-pixel unit, and specifically, the size of the second mesh in the second polymer dispersed liquid crystal layer 103 can be flexibly set according to the definition effect of the polymer network overlapping each sub-pixel unit in the actual product, and is not limited herein.
Optionally, in the display panel provided in the embodiment of the present invention, the first polymer dispersed liquid crystal layer 101 and the second polymer dispersed liquid crystal layer 103 are an integral structure. That is, the polymer dispersed liquid crystal layer is a whole layer, and no additional Pattern (Pattern) is needed, thereby reducing the process and the cost.
Optionally, in the display panel provided in the embodiment of the present invention, as shown in fig. 1, the driving unit 102 includes: a driving chip 1021, a negative temperature coefficient temperature control resistor 1022, and a first transparent electrode 1023 and a second transparent electrode 1024 located at two sides of the first polymer dispersed liquid crystal layer 101;
second transparent electrode 1024, driving chip 1021, negative temperature coefficient temperature-controlled resistor 1022, and first transparent electrode 1023 are electrically connected in sequence.
Since the voltage applied to the polymer dispersed liquid crystal layer is directly controlled by the additional driving chip (IC), the back panel circuit of the display substrate does not need to be redesigned.
In addition, as the temperature rises, the smaller the resistance of the negative temperature coefficient temperature control resistor 1022, the larger the temperature and voltage difference between the first transparent electrode 1023 and the second transparent electrode 1024, the lower the light transmittance of the liquid crystal molecules above the blue sub-pixel unit B, the red sub-pixel unit R and the green sub-pixel unit G, and the lower the light transmittance in sequence, thereby compensating the light-emitting efficiency attenuation difference of the blue sub-pixel unit B, the red sub-pixel unit R and the green sub-pixel unit G caused by the temperature rise, ensuring the light-emitting efficiency attenuation balance of the blue sub-pixel unit B, the red sub-pixel unit R and the green sub-pixel unit G caused by the temperature rise, and improving the green and high-temperature powder emission conditions.
Based on the same inventive concept, embodiments of the present invention provide a method for manufacturing a display panel, and since a principle of the method for solving the problem is similar to a principle of the method for solving the problem of the display panel, the implementation of the method for manufacturing the display panel provided by embodiments of the present invention can refer to the implementation of the display panel provided by embodiments of the present invention, and repeated details are not repeated.
Specifically, an embodiment of the present invention further provides a method for manufacturing a display panel, including:
providing a display substrate with a plurality of sub-pixel units;
forming a light regulation structure which is overlapped with each sub-pixel unit on the display substrate; light regulation and control structure includes: a first polymer dispersed liquid crystal layer and a driving unit;
a first polymer dispersed liquid crystal layer comprising: a polymer network having a first mesh, and liquid crystal molecules dispersed in the polymer network;
the diameter of the first mesh which is overlapped with each sub-pixel unit in the direction vertical to the display substrate is in a negative correlation with the luminous efficiency attenuation amplitude of the sub-pixel unit;
the driving unit is configured to adjust a voltage applied to the first polymer dispersed liquid crystal layer according to a temperature.
Optionally, in the manufacturing method provided in the embodiment of the present invention, the sub-pixel unit includes: the red sub-pixel unit, the green sub-pixel unit and the blue sub-pixel unit form a first polymer dispersed liquid crystal layer, and the method specifically comprises the following steps:
using 1mW/cm2The ultraviolet area light source and the evaporation mask plate of the green sub-pixel are used for processing the liquid crystal mixture above the green sub-pixel for 5 min;
using 0.8mW/cm2The ultraviolet surface light source and the vapor plating mask plate of the red sub-pixel process the liquid crystal mixture above the red sub-pixel for 4 min;
using 0.6mW/cm2The ultraviolet area light source and the evaporation mask plate of the blue sub-pixel process the liquid crystal mixture above the blue sub-pixel for 3 min;
a liquid crystal mixture comprising: the liquid crystal display comprises more than 70% and less than 100% of negative dielectric anisotropy liquid crystal molecules, more than 0 and less than 10% of polyethylene glycol methyl ether methacrylate, more than 0 and less than 10% of 1, 3-butanediol diacrylate, more than 0 and less than 10% of neopentyl glycol diacrylate, more than 0 and less than 10% of trimethylolpropane triacrylate, more than 0 and less than 1% of 2,4, 6-trimethylformylphenyl ethyl phosphate and more than 0 and less than 1% of 2-hydroxy-2-methyl propiophenone.
In the process of forming the first polymer dispersed liquid crystal layer, the evaporation mask (such as an FMM mask) is multiplexed into an Ultraviolet (UV) polymerization mask, so that the UV polymerization mask does not need to be customized again, and the cost is reduced. In addition, the order of performing the ultraviolet polymerization on the liquid crystal mixture above the red sub-pixel unit R, the green sub-pixel unit G and the blue sub-pixel unit B is not limited to the above description, as long as the ultraviolet polymerization on the liquid crystal mixture above the red sub-pixel unit R, the green sub-pixel unit G and the blue sub-pixel unit B is achieved step by step.
Optionally, in the above manufacturing method provided by the embodiment of the present invention, the liquid crystal mixture includes: 79.6 mass percent of negative dielectric anisotropy liquid crystal molecules, 5.3 mass percent of polyethylene glycol methyl ether methacrylate, 6.7 mass percent of 1, 3-butanediol diacrylate, 4.7 mass percent of neopentyl glycol diacrylate, 3.9 mass percent of trimethylolpropane triacrylate, 0.2 mass percent of 2,4, 6-trimethylformylphenyl ethyl phosphate and 0.2 mass percent of 2-hydroxy-2-methyl propiophenone;
the first mesh diameter of the polymer network overlapping the green sub-pixel is 1 μm to 3 μm, the first mesh diameter of the polymer network overlapping the red sub-pixel is 3 μm to 5 μm, and the first mesh diameter of the polymer network overlapping the blue sub-pixel is 5 μm to 8 μm.
Optionally, in the manufacturing method provided in the embodiment of the present invention, after the first polymer dispersed liquid crystal layer is formed, the following steps may be further performed:
using 0.6mW/cm2The liquid crystal mixture is treated for 5min to obtain a second polymer dispersion having second meshes over the region where the gap between the sub-pixel units is locatedA seed layer.
In order to better understand the above-mentioned manufacturing method provided by the embodiment of the present invention, the following description is made in conjunction with the manufacturing of the light-regulating structure shown in fig. 1.
Depositing transparent Indium Tin Oxide (ITO) or aluminum-doped zinc oxide (AZO) as a first transparent electrode 1023 on the display substrate (specifically, on the uppermost layer of the display substrate, the thin film encapsulation TFE layer) by Physical Vapor Deposition (PVD); a compounded liquid crystal mixture is then coated on first transparent electrode 1023, the liquid crystal mixture including: 79.6 mass percent of negative dielectric anisotropy liquid crystal molecules, 5.3 mass percent of polyethylene glycol methyl ether methacrylate, 6.7 mass percent of 1, 3-butanediol diacrylate, 4.7 mass percent of neopentyl glycol diacrylate, 3.9 mass percent of trimethylolpropane triacrylate, 0.2 mass percent of 2,4, 6-trimethylformylphenyl ethyl phosphate and 0.2 mass percent of 2-hydroxy-2-methyl propiophenone; transparent ITO or AZO is then deposited as the second transparent electrode 1024 by PVD. First transparent electrode 1023 is connected with driving chip 1024 through series negative temperature coefficient temperature control resistor 1022, and second transparent electrode 1024 is directly connected with driving chip 1024. The liquid crystal mixture is then polymerized by the following four steps: (1) using 1mW/cm2The ultraviolet area light source and the evaporation mask plate of the green sub-pixel are used for processing the liquid crystal mixture above the green sub-pixel for 5min to obtain a polymer network with the diameter of a first mesh opening of 1-3 mu m; (2) using 0.8mW/cm2The ultraviolet surface light source and the vapor plating mask plate of the red sub-pixel are used for processing the liquid crystal mixture above the red sub-pixel for 4min to obtain a polymer network with the diameter of a first mesh being 3-5 mu m; (3) using 0.6mW/cm2The ultraviolet area light source and the evaporation mask plate of the blue sub-pixel are used for processing the liquid crystal mixture above the blue sub-pixel for 3min to obtain a polymer network with the diameter of a first mesh of 5-8 mu m; (4) using 0.6mW/cm2The ultraviolet surface light source of (2) processes the liquid crystal mixture over the region where the gap between the sub-pixel units is located for 5 min.
Based on the same inventive concept, an embodiment of the present invention further provides a display device, including the display panel provided in the embodiment of the present invention, where the display device may be: any product or component with a display function, such as a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, a navigator, an intelligent watch, a fitness wrist strap, and a personal digital assistant. Other essential components of the display device should be understood by those skilled in the art, and are not described herein nor should they be construed as limiting the present invention. In addition, because the principle of the display device to solve the problem is similar to that of the display panel, the display device can be implemented according to the embodiment of the display panel, and repeated descriptions are omitted.
The display panel, the manufacturing method thereof and the display device provided by the embodiment of the invention comprise the following steps: a display substrate having a plurality of sub-pixel units, a light regulating structure located above each sub-pixel unit; wherein, light regulation and control structure includes: a first polymer dispersed liquid crystal layer and a driving unit; a first polymer dispersed liquid crystal layer comprising: a polymer network having a first mesh, and liquid crystal molecules dispersed in the polymer network; the diameter of the first mesh which is overlapped with each sub-pixel unit in the direction vertical to the display substrate is in a negative correlation with the luminous efficiency attenuation amplitude of the sub-pixel unit; the driving unit is configured to adjust a voltage applied to the first polymer dispersed liquid crystal layer according to a temperature. The smaller the first mesh of the polymer network is, the stronger the constraint effect on the liquid crystal molecules is, and the less the liquid crystal molecules are deflected under the same electric field condition; on the contrary, the larger the first mesh of the polymer network is, the weaker the binding effect on the liquid crystal molecules is, and the liquid crystal molecules are easier to deflect under the same electric field condition; therefore, under the condition that the diameter of the first mesh which is mutually overlapped with each sub-pixel unit and the luminous efficiency attenuation amplitude of the sub-pixel unit are in a negative correlation relation, the driving unit adjusts the voltage loaded on the first polymer dispersed liquid crystal layer by responding to the temperature change, so that the light transmittance of liquid crystal molecules above each sub-pixel unit is changed, specifically, the smaller the diameter of the first mesh is, the more the liquid crystal molecules transmit the emitted light of the sub-pixel unit overlapped with the first mesh, the difference of the luminous efficiency of each sub-pixel unit along with the temperature change is compensated, the consistent brightness change trend of each sub-pixel unit along with the temperature change is ensured, and the phenomena of low-temperature bluing and high-temperature powdering are improved.
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 display panel, comprising: the display device comprises a display substrate with a plurality of sub-pixel units, and a light regulation structure positioned on each sub-pixel unit;
wherein, light regulation and control structure includes: a first polymer dispersed liquid crystal layer and a driving unit;
the first polymer dispersed liquid crystal layer includes: a polymer network having a first mesh, and liquid crystal molecules dispersed in the polymer network;
in the direction vertical to the display substrate, the diameter of the first mesh which is mutually overlapped with each sub-pixel unit is in a negative correlation with the luminous efficiency attenuation amplitude of the sub-pixel unit;
the driving unit is configured to adjust a voltage applied to the first polymer dispersed liquid crystal layer according to a temperature.
2. The display panel of claim 1, wherein the sub-pixel unit comprises: the pixel structure comprises a red sub-pixel unit, a green sub-pixel unit and a blue sub-pixel unit;
the first mesh overlapping the green sub-pixel unit, the first mesh overlapping the red sub-pixel unit, and the first mesh overlapping the blue sub-pixel unit decrease in order.
3. The display panel according to claim 1 or 2, further comprising: a second polymer dispersed liquid crystal layer located over a region where the gap between the sub-pixel units is located;
the second polymer dispersed liquid crystal layer includes: the polymer network having a second mesh, and the liquid crystal molecules dispersed in the polymer network.
4. The display panel according to claim 3, wherein the first polymer dispersed liquid crystal layer and the second polymer dispersed liquid crystal layer are of an integral structure.
5. The display panel according to claim 4, wherein the driving unit includes: the driving chip, the negative temperature coefficient temperature control resistor, and the first transparent electrode and the second transparent electrode which are positioned at two sides of the first polymer dispersed liquid crystal layer;
the second transparent electrode, the driving chip, the negative temperature coefficient temperature control resistor and the first transparent electrode are electrically connected in sequence.
6. A display device, comprising: the display panel of any one of claims 1-5.
7. A method for manufacturing a display panel is characterized by comprising the following steps:
providing a display substrate with a plurality of sub-pixel units;
forming a light regulation structure which is overlapped with each sub-pixel unit on the display substrate; the light ray regulation and control structure includes: a first polymer dispersed liquid crystal layer and a driving unit;
the first polymer dispersed liquid crystal layer includes: a polymer network having a first mesh, and liquid crystal molecules dispersed in the polymer network;
in the direction vertical to the display substrate, the diameter of the first mesh which is mutually overlapped with each sub-pixel unit is in a negative correlation with the luminous efficiency attenuation amplitude of the sub-pixel unit;
the driving unit is configured to adjust a voltage applied to the first polymer dispersed liquid crystal layer according to a temperature.
8. The method of claim 7, wherein the sub-pixel unit comprises: the red sub-pixel unit, the green sub-pixel unit and the blue sub-pixel unit form a first polymer dispersed liquid crystal layer, and the method specifically comprises the following steps:
using 1mW/cm2The ultraviolet area light source and the evaporation mask plate of the green sub-pixel process the liquid crystal mixture above the green sub-pixel for 5 min;
using 0.8mW/cm2The ultraviolet area light source and the evaporation mask plate of the red sub-pixel process the liquid crystal mixture above the red sub-pixel for 4 min;
using 0.6mW/cm2The ultraviolet area light source and the evaporation mask plate of the blue sub-pixel process the liquid crystal mixture above the blue sub-pixel for 3 min;
the liquid crystal mixture comprises: the liquid crystal display comprises more than 70% and less than 100% of negative dielectric anisotropy liquid crystal molecules, more than 0 and less than 10% of polyethylene glycol methyl ether methacrylate, more than 0 and less than 10% of 1, 3-butanediol diacrylate, more than 0 and less than 10% of neopentyl glycol diacrylate, more than 0 and less than 10% of trimethylolpropane triacrylate, more than 0 and less than 1% of 2,4, 6-trimethylformylphenyl ethyl phosphate and more than 0 and less than 1% of 2-hydroxy-2-methyl propiophenone.
9. The method of claim 8, wherein the liquid crystal mixture comprises: 79.6 mass percent of negative dielectric anisotropy liquid crystal molecules, 5.3 mass percent of polyethylene glycol methyl ether methacrylate, 6.7 mass percent of 1, 3-butanediol diacrylate, 4.7 mass percent of neopentyl glycol diacrylate, 3.9 mass percent of trimethylolpropane triacrylate, 0.2 mass percent of 2,4, 6-trimethylformylphenyl ethyl phosphate and 0.2 mass percent of 2-hydroxy-2-methyl propiophenone;
the first mesh diameter of the polymer network overlapping the green sub-pixel is 1 μm to 3 μm, the first mesh diameter of the polymer network overlapping the red sub-pixel is 3 μm to 5 μm, and the first mesh diameter of the polymer network overlapping the blue sub-pixel is 5 μm to 8 μm.
10. The manufacturing method according to claim 8 or 9, further comprising, after forming the first polymer dispersed liquid crystal layer:
using 0.6mW/cm2The liquid crystal mixture is processed for 5min to obtain a second polymer dispersed liquid crystal layer having second meshes over a region where a gap between the sub-pixel units is located.
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| CN114078437A (en) * | 2021-11-23 | 2022-02-22 | 京东方科技集团股份有限公司 | Brightness compensation method, display panel and display device |
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