CN114924442A - Alignment method of display panel and display panel - Google Patents
Alignment method of display panel and display panel Download PDFInfo
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- CN114924442A CN114924442A CN202210537710.2A CN202210537710A CN114924442A CN 114924442 A CN114924442 A CN 114924442A CN 202210537710 A CN202210537710 A CN 202210537710A CN 114924442 A CN114924442 A CN 114924442A
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- 238000000034 method Methods 0.000 title claims abstract description 51
- 239000004973 liquid crystal related substance Substances 0.000 claims abstract description 113
- 239000000203 mixture Substances 0.000 claims abstract description 44
- 239000000178 monomer Substances 0.000 claims abstract description 33
- 238000006116 polymerization reaction Methods 0.000 claims abstract description 16
- 239000000758 substrate Substances 0.000 claims description 54
- 230000005611 electricity Effects 0.000 claims description 10
- 230000003068 static effect Effects 0.000 claims description 10
- 238000004873 anchoring Methods 0.000 abstract description 17
- 229920000642 polymer Polymers 0.000 abstract description 15
- 230000000694 effects Effects 0.000 abstract description 4
- 230000005684 electric field Effects 0.000 description 5
- 239000004642 Polyimide Substances 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 4
- 229920001721 polyimide Polymers 0.000 description 4
- 239000000565 sealant Substances 0.000 description 4
- 239000010408 film Substances 0.000 description 3
- 229920002120 photoresistant polymer Polymers 0.000 description 3
- 238000002834 transmittance Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000005286 illumination Methods 0.000 description 2
- 238000009828 non-uniform distribution Methods 0.000 description 2
- NIXOWILDQLNWCW-UHFFFAOYSA-M Acrylate Chemical compound [O-]C(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000007641 inkjet printing Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000379 polymerizing effect Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1337—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers
- G02F1/13378—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers by treatment of the surface, e.g. embossing, rubbing or light irradiation
- G02F1/133788—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers by treatment of the surface, e.g. embossing, rubbing or light irradiation by light irradiation, e.g. linearly polarised light photo-polymerisation
-
- 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
- G02F1/1337—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers
- G02F1/133711—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers by organic films, e.g. polymeric films
- G02F1/133723—Polyimide, polyamide-imide
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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
- G02F1/1337—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers
- G02F1/133738—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers for homogeneous alignment
Abstract
The application provides an alignment method of a display panel and the display panel, before a first preset voltage is loaded on a liquid crystal composition to enable part of liquid crystal molecules to form a preset pretilt angle, the display panel to be aligned is subjected to first light irradiation, part of photoreactive monomers are subjected to polymerization reaction under the first light irradiation to obtain polymers, the polymers have an anchoring effect on the liquid crystal molecules, the difference of anchoring forces on the liquid crystal molecules caused by the thickness difference of a first alignment layer and a second alignment layer close to respective edges is compensated, the pretilt angle difference generated under the action of the first preset voltage due to the difference of the anchoring forces on a plurality of liquid crystal molecules is improved, and the problem of uneven brightness caused by the fact that the pretilt angle difference of the liquid crystal molecules exists in a display area due to the narrow frame is further improved.
Description
Technical Field
The present application relates to the field of display technologies, and in particular, to an alignment method for a display panel and a display panel.
Background
With the rapid development of liquid crystal display devices, liquid crystal display devices are not only rapidly developed in industries such as smart mobile terminals and television screens, but also increasingly put forward demands on liquid crystal display devices in other industries, such as the increasingly vigorous electronic competition display industry. With the increasing demand of the market for liquid crystal display devices, narrow-frame liquid crystal display devices have come into play.
However, the narrow frame causes the display area of the liquid crystal display device to have a problem of uneven brightness display.
Disclosure of Invention
The present disclosure is directed to a display panel and an alignment method thereof, so as to solve the problem of uneven brightness display in a display area of the display panel due to an excessively narrow frame.
In order to realize the purpose, the technical scheme is as follows:
a method for aligning a display panel, the method comprising:
providing a display panel to be aligned, wherein the display panel to be aligned comprises a first substrate, a second substrate, a liquid crystal composition, a first alignment layer and a second alignment layer which are oppositely arranged, the first alignment layer is arranged on the surface of the first substrate close to the second substrate, the second alignment layer is arranged on the surface of the second substrate close to the first substrate, the liquid crystal composition is arranged between the first alignment layer and the second alignment layer, and the liquid crystal composition comprises a plurality of liquid crystal molecules and a plurality of photoreactive monomers;
carrying out first light irradiation on the display panel to be aligned, and carrying out polymerization reaction on part of the photoreactive monomer under the first light irradiation;
and carrying out second light irradiation on the display panel to be aligned while loading a first preset voltage on the liquid crystal composition, deflecting a plurality of liquid crystal molecules under the action of the first preset voltage, deflecting the liquid crystal molecules close to the first alignment layer and the second alignment layer to have preset pretilt angles, and carrying out polymerization reaction on at least part of the residual photoreactive monomers under the second light irradiation.
In some embodiments, the alignment method of the display panel, the first light irradiation and the second light irradiation use the same wavelength of light, and a time period of the first light irradiation is shorter than a time period of the second light irradiation.
In some embodiments, before the first light irradiation is performed on the display panel to be aligned, the method further includes:
and performing static electricity removal treatment on the display panel to be aligned.
In some embodiments, the alignment method of a display panel, the performing static electricity removal processing on the display panel to be aligned includes:
and applying a second preset voltage to the liquid crystal composition in the display panel to be matched.
In some embodiments, after the display panel to be aligned is loaded with a second preset voltage and before the display panel to be aligned is irradiated with the first light, the method further includes:
and loading a third preset voltage to the liquid crystal composition in the display panel to be aligned, wherein the third preset voltage is greater than the first preset voltage.
In some example display panel alignment methods, applying a second preset voltage to the liquid crystal composition in the display panel to be aligned and applying a third preset voltage to the liquid crystal composition in the display panel to be aligned are sequentially alternated at least twice.
In some embodiment alignment methods of a display panel, after the second light irradiation is performed on the display panel to be aligned, the method further includes:
and carrying out third light irradiation on the display panel to be aligned after the second light irradiation treatment, wherein the residual photoreactive monomer is subjected to polymerization reaction under the action of the third light irradiation.
In some embodiments, the alignment method for a display panel further includes a filter layer disposed between the first substrate and the first alignment layer, and light used for the first light irradiation and the second light irradiation is incident from a side of the second substrate away from the first substrate.
In some example display panel alignment methods, the first alignment layer and the second alignment layer have a thickness greater than or equal to 70 microns and less than or equal to 100 microns.
A display panel is manufactured by the alignment method of the display panel.
Has the advantages that: the application provides an alignment method of a display panel and the display panel, before a first preset voltage is loaded on a liquid crystal composition to enable part of liquid crystal molecules to form a preset pretilt angle, the display panel to be aligned is subjected to first light irradiation, part of photoreactive monomers are subjected to polymerization reaction under the first light irradiation to obtain polymers, the polymers have an anchoring effect on the liquid crystal molecules, the difference of anchoring forces on the liquid crystal molecules caused by the thickness difference of a first alignment layer and a second alignment layer close to respective edges is compensated, the pretilt angle difference generated under the action of the first preset voltage due to the difference of the anchoring forces on a plurality of liquid crystal molecules is improved, and the problem of uneven brightness caused by the fact that the pretilt angle difference of the liquid crystal molecules exists in a display area due to the narrow frame is further improved.
Drawings
Fig. 1 is a schematic flow chart illustrating an alignment method of a display panel according to an embodiment of the present disclosure;
FIG. 2A-FIG. 2C are schematic process diagrams illustrating an alignment method for a display panel according to an embodiment of the present disclosure;
FIG. 3 is a graph showing voltage (V) -transmittance (T) curves of a display panel under different conditions;
FIG. 4 is a schematic flow chart illustrating an alignment method for a display panel according to another embodiment of the present disclosure;
fig. 5 is a flowchart illustrating an alignment method of a display panel according to another embodiment of the present disclosure.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Please refer to fig. 1, which is a flowchart illustrating an alignment method of a display panel according to an embodiment of the present disclosure. The alignment method of the display panel comprises the following steps:
s101: the display panel to be aligned is provided and comprises a first substrate, a second substrate, a liquid crystal composition, a first alignment layer and a second alignment layer, wherein the first substrate and the second substrate are oppositely arranged, the first alignment layer is arranged on the surface, close to the second substrate, of the first substrate, the second alignment layer is arranged on the surface, close to the first substrate, of the second substrate, the liquid crystal composition is arranged between the first alignment layer and the second alignment layer, and the liquid crystal composition comprises a plurality of liquid crystal molecules and a plurality of photoreaction monomers.
Specifically, referring to fig. 2A, the display panel 100 to be aligned has a display area 100a and a frame area 100b, and the frame area 100b is located at the periphery of the display area 100 a. The display panel 100 to be aligned includes a first substrate 110 and a second substrate 120, a filter layer 119, a pixel electrode 112, a common electrode 122, a first alignment layer 114, a second alignment layer 124, a liquid crystal composition, and a sealant 117 disposed opposite to each other.
The first alignment layer 114 and the second alignment layer 124 are located in the display region 100a and the frame region 100 b. The first alignment layer 114 is disposed on a surface of the first substrate 110 close to the second substrate 120, and the second alignment layer 124 is disposed on a surface of the second substrate 120 close to the first substrate 110.
The first alignment layer 114 and the second alignment layer 124 are vertical alignment films, each vertical alignment film includes polyimide, the polyimide includes a polyimide main chain and a first branch 1141 connected to the polyimide main chain, and the first branch 1141 extends along the thickness direction of the display panel 100 to be aligned.
The thickness of the first alignment layer 114 and the second alignment layer 124 is greater than or equal to 70 microns and less than or equal to 100 microns, such as 80 microns, 90 microns, or 100 microns.
The first alignment layer 114 and the second alignment layer 124 are obtained by coating an alignment solution by inkjet printing, polymerizing the alignment solution at a high temperature, and performing a vertical alignment process. Due to the action of the surface tension, the portions of the first alignment layer 114 and the second alignment layer 124, which are formed after the alignment solution is shaped, near the respective edges have a problem of uneven thickness, and the first branches 1141 are densely distributed at the positions with thicker thickness and the first branches 1141 are sparsely distributed at the positions with thinner thickness. The frame area 100b to be aligned to the display panel 100 is narrow, and the portions of the first alignment layer 114 and the second alignment layer 124 having non-uniform thicknesses near the respective edges exist in the display area 100a, resulting in non-uniform distribution of the first branches 1141 of the display area 100a near the frame area 100 b.
The sealant 117 is located in the frame area 100 b. The sealant 117 is disposed between the first substrate 110 and the second substrate 120, and connects the first substrate 110 and the second substrate 120.
The liquid crystal composition is disposed in a space surrounded by the sealant 117, the first substrate 110 and the second substrate 120, and the liquid crystal composition is disposed between the first alignment layer 114 and the second alignment layer 124. The liquid crystal composition includes a plurality of liquid crystal molecules 118, a plurality of photoreactive monomers 116, and a photoinitiator. The liquid crystal molecules 118 are negative liquid crystal molecules, the photoreactive monomer 116 is an acrylate monomer, and the photoinitiator is an ultraviolet photoinitiator.
When no electric field is applied to the liquid crystal molecules 118, the long axes of the liquid crystal molecules 118 are parallel to the thickness direction of the display panel 100 to be aligned, and at this time, the first branches 1141, which are unevenly distributed in the display area 100a close to the frame area 100b, also have a problem that the alignment force provided to the liquid crystal molecules 118 along the thickness direction of the display panel 100 to be aligned is unevenly distributed.
The pixel electrode 112 is disposed between the first substrate 110 and the first alignment layer 114, and the plurality of pixel electrodes 112 are disposed at intervals. The pixel electrode 112 is made of a transparent conductive material.
The common electrode 122 is disposed between the second substrate 120 and the second alignment layer 124. The common electrode 122 is a whole transparent conductive layer.
The filter layer 119 is disposed between the first substrate 110 and the first alignment layer 114, the pixel electrode 112 is disposed between the filter layer 119 and the first alignment layer 114, and a thin film transistor array layer is disposed between the filter layer 119 and the first substrate 110. The filter layer 119 includes a red photoresist, a blue photoresist and a green photoresist.
The filter layer 119 may be disposed between the second substrate 120 and the common electrode 122.
S102: and carrying out first light irradiation on the display panel to be aligned, and carrying out polymerization reaction on part of the photoreaction monomer under the first light irradiation.
Specifically, referring to fig. 2B, the first ultraviolet light L1 is incident on the display panel 100 to be aligned from the side of the second substrate 120 away from the first substrate 110, the first ultraviolet light L1 passes through the second substrate 120 and irradiates the liquid crystal composition, the photoinitiator in the liquid crystal composition is activated by the first ultraviolet light L1, the activated photoinitiator initiates part of the photoreactive monomer 116 to polymerize, so as to obtain a first polymer 1161, the first polymer 1161 is formed on the surfaces of the first alignment layer 114 and the second alignment layer 124, the first polymer 1161 includes a second branch 1162 extending along a first direction, and the first direction is parallel to the thickness direction of the display panel 100 to be aligned.
The wavelength of the first ultraviolet light L1 is greater than or equal to 300 nm and less than or equal to 330 nm, for example, 315 nm and 320 nm. The illuminance of the first ultraviolet light L1 during the first light irradiation is greater than or equal to 0.4mW/cm 2 And less than or equal to 0.6mW/cm 2 For example, 0.45mW/cm 2 . And the first ultraviolet light L1 is irradiated for the first time for a time period greater than or equal to 25s and less than or equal to 35s, for example, for a time period of 32 s.
It should be noted that the second branch chain 1162 provides an alignment force in the thickness direction of the display panel 100 to the liquid crystal molecules 118, so that the overall alignment force applied to the liquid crystal molecules 118 in the thickness direction of the display panel 100 increases, the degree of order of the liquid crystal molecules 118 is increased without being affected by an external electric field, and the effect of the difference of the alignment forces of the first alignment layer 114 and the second alignment layer 124 on the liquid crystal molecules 118 in the display area 100a close to the frame area 100b on the liquid crystal molecules 118 is relatively reduced.
S103: and (2) carrying out second light irradiation on the display panel to be aligned while loading a first preset voltage on the liquid crystal composition, deflecting a plurality of liquid crystal molecules under the action of the first preset voltage, deflecting the liquid crystal molecules close to the first alignment layer and the second alignment layer to have a preset pretilt angle, and carrying out polymerization reaction on at least part of the rest of the photoreactive monomers under the second light irradiation to obtain the display panel.
Specifically, referring to fig. 2C, voltages are respectively applied to the pixel electrode 112 and the common electrode 122, a difference between the voltages applied to the pixel electrode 112 and the common electrode 122 is a first preset voltage V1, the liquid crystal molecules 118 close to the first alignment layer 114 and the second alignment layer 124 are simultaneously deflected to have a preset pretilt angle by an electric field force corresponding to the first preset voltage V1, an alignment force of the second branch 1162 and the first branch 1141, and the liquid crystal molecules 118 far away from the first alignment layer 114 and the second alignment layer 124 are deflected to be perpendicular to the thickness direction of the display panel 100 to be aligned only by an electric field force corresponding to the first preset voltage V1; meanwhile, the second ultraviolet light L2 is incident on the display panel 100 to be aligned from the side of the second substrate 120 away from the first substrate 110, the second ultraviolet light L2 irradiates the liquid crystal composition through the second substrate 120, etc., the photoinitiator in the liquid crystal composition is activated by the first ultraviolet light L1, the activated photoinitiator initiates polymerization of the remaining at least part of the photoreactive monomer 116 to obtain a second polymer 1163, the second polymer 1163 is formed on the surfaces of the first alignment layer 114 and the second alignment layer 124, and the second polymer 1163 includes a third branch 1164 extending along the second direction.
Wherein, the included angle between the second direction and the first direction is more than 0 degree and less than 90 degrees or more than 90 degrees and less than 180 degrees. The second direction is related to the pre-set pretilt angle of the liquid crystal molecules 118 near the first alignment layer 114 and the second alignment layer 124.
The first preset voltage V1 is a saturation voltage, which is a critical voltage at which the long axes of the liquid crystal molecules 118 deflect from being parallel to the thickness direction of the display panel 100 to be aligned to be perpendicular to the thickness direction of the display panel 100. The first predetermined voltage V1 is greater than or equal to 12V and less than or equal to 15V, for example, the first predetermined voltage V1 is 13V, 14V.
The wavelength of the second ultraviolet light L2 is the same as that of the first ultraviolet light L1, and the illuminance of the first light irradiation is equal to that of the second light irradiation, so that the second light irradiation and the first light irradiation can be completed by the same ultraviolet lamp irradiation.
The included angle between the tilt direction of the liquid crystal molecules 118 with the predetermined pretilt angle and the direction perpendicular to the thickness of the display panel 100 to be aligned is greater than or equal to 1 degree and less than or equal to 1.5 degrees, such as 1.2 degrees and 1.3 degrees.
The duration of the first light irradiation is less than the duration of the second light irradiation, so that the amount of the photoreactive monomer 116 reacted in the first light irradiation is less than the amount of the second light irradiation. The ratio of the time period of the second light irradiation to the time period of the first light irradiation is greater than or equal to 2 and less than or equal to 3. Specifically, the duration of the second light irradiation is greater than or equal to 60s and less than or equal to 80 s.
It should be noted that, for the liquid crystal molecules 118 close to the first alignment layer 114 and the second alignment layer 124, the alignment force applied by the second branch 1162 and the first branch 1141 is simultaneously applied, the alignment force applied to the liquid crystal molecules 118 in the display area 100a close to the frame area 100b is less affected by the non-uniform distribution of the alignment force applied by the first branch 1141, and after the electric field force corresponding to the first preset voltage V1 is applied to the plurality of liquid crystal molecules 118, the difference between the pre-tilt angles formed by the liquid crystal molecules 118 close to the first alignment layer 114 and the second alignment layer 124 in the display area 100a close to the frame area 100b and other positions of the display area 100a is smaller, which is beneficial to improving the display non-uniformity problem of the display panel caused by the difference between the pre-tilt angles.
In addition, in the conventional technology, when a voltage is applied to the liquid crystal mixture to form a preset pretilt angle, the photoreactive monomer in the liquid crystal mixture is polymerized by first illumination, and then the liquid crystal mixture is illuminated for the second time under the condition that the liquid crystal mixture is not electrified, although the reaction amount of the photoreactive monomer is increased and the anchoring force on the liquid crystal molecules is further increased, when the preset pretilt angle is formed by the liquid crystal molecules under the action of a saturation voltage, the difference of the alignment force applied by the alignment film in the display area close to the frame area is not improved, so that the difference of the pretilt angles formed by the liquid crystal molecules cannot be improved.
In this embodiment, in the alignment method of the display panel, before the liquid crystal composition is loaded with the first preset voltage to form the preset pretilt angle on part of the liquid crystal molecules, the first light irradiation is performed on the display panel to be aligned, part of the photoreactive monomer undergoes a polymerization reaction under the first light irradiation to obtain the polymer, and the polymer performs an anchoring effect on the liquid crystal molecules to compensate for the difference in thickness of the first alignment layer and the second alignment layer near the respective edges to cause the difference in anchoring force on the liquid crystal molecules, so as to improve the pretilt angle difference generated under the action of the first preset voltage due to the difference in anchoring force between the plurality of liquid crystal molecules, and further improve the problem of uneven brightness caused by the pretilt angle difference of the liquid crystal molecules existing in the display region due to the narrow frame.
Please refer to fig. 3, which is a diagram illustrating voltage (V) -transmittance (T) curves of a display panel under different conditions. The curve 1 is the VT curve corresponding to the display panel to be aligned before the processing in step S102, the curve 2 is the VT curve corresponding to the display panel to be aligned after the processing in step S103 without the processing in step S102, and the curve 3 is the VT curve corresponding to the display panel to be aligned after the processing in step S102 and step S103.
As can be seen from fig. 3, when the transmittance T is a, the voltage V required by the curve 1 is greater than the voltage V required by the curve 3, and the driving voltage V required by the curve 3 is greater than the voltage V required by the curve 2, mainly because the photoreactive monomer 116 in the display panel to be aligned before the processing in step S102 is not reacted, the anchoring force of the first branch 1141 of the first alignment layer 114 and the second alignment layer 124 on the liquid crystal molecules 118 is strong, and a larger voltage is required to drive the liquid crystal molecules 118 to deflect; in the to-be-aligned display panel processed in step S103 without being processed in step S102, a part of the unreacted photoreactive monomer 116 covers the first branch 1141 of the first alignment layer 114 and the second alignment layer 124, and the branch of the polymer formed after polymerization of the photoreactive monomer 116 also has an anchoring force on the liquid crystal molecules 118, but the anchoring force applied to the whole liquid crystal molecules 118 is relatively weakened; in the to-be-aligned display panel sequentially processed in steps S102 and S103, the reaction amount of the photoreactive monomer 116 increases, the sum of the anchoring force provided by the branched chain of the polymer formed after polymerization of the photoreactive monomer 116 to the liquid crystal molecules 118 and the anchoring force provided by the first branched chain 1141 of the first alignment layer 114 and the second alignment layer 124 to the liquid crystal molecules increases, the controllability of the anchoring force to the liquid crystal molecules 118 is enhanced, and the voltage required for driving the liquid crystal molecules 118 to deflect relatively increases.
Please refer to fig. 4, which is a flowchart illustrating an alignment method of a display panel according to another embodiment of the present application. The alignment method of the display panel shown in fig. 4 is substantially similar to the alignment method of the display panel shown in fig. 1, except that before the first light irradiation is performed on the display panel 100 to be aligned, the method further includes:
s104: and performing static electricity removal treatment on the display panel to be aligned.
Specifically, a second preset voltage is applied to the liquid crystal composition in the display panel 100 to be aligned, where the second preset voltage is a difference between voltages applied to the pixel electrode 112 and the common electrode 122, and the second preset voltage is equal to 0V or close to 0V, so as to form a circuit loop to eliminate static electricity. For example, no voltage is applied to the pixel electrode 112 and the common electrode 122, so that the second preset voltage is 0V.
It should be noted that, because the display panel to be aligned is charged with static electricity during the manufacturing process, the static electricity in the display panel to be aligned is eliminated, which is beneficial to avoiding the problem that liquid crystal molecules are deflected in advance due to static electricity, so that the liquid crystal molecules are poorly aligned.
S105: and applying a third preset voltage to the liquid crystal composition in the display panel to be aligned.
Specifically, the liquid crystal composition in the display panel 100 to be aligned is applied with a third preset voltage, where the third preset voltage is a difference between voltages applied to the pixel electrode 112 and the common electrode 122, and the third preset voltage is greater than the first preset voltage V1. Since the third predetermined voltage is greater than the first predetermined voltage V1, the long axes of the liquid crystal molecules 118 are substantially all arranged along the direction perpendicular to the thickness of the display panel 100 to be aligned, and the degree of order of the arrangement of the liquid crystal molecules 118 increases.
The third preset voltage is greater than or equal to 15V and less than or equal to 18V, for example, 16V or 17V.
Further, the application of the second preset voltage to the liquid crystal composition in the display panel 100 to be aligned and the application of the third preset voltage to the liquid crystal composition in the display panel 100 to be aligned are sequentially alternated at least twice, so as to further eliminate the static electricity and increase the degree of order of the arrangement of the plurality of liquid crystal molecules 118.
Specifically, the application of the second preset voltage to the liquid crystal composition in the display panel 100 to be aligned and the application of the third preset voltage to the liquid crystal composition in the display panel 100 to be aligned alternate twice in sequence.
Please refer to fig. 5, which is a flowchart illustrating an alignment method of a display panel according to another embodiment of the present disclosure. The alignment method of the display panel shown in fig. 5 is substantially similar to the alignment method of the display panel shown in fig. 1, except that after the second light irradiation is performed on the display panel 100 to be aligned, the method further includes:
s106: and carrying out third light irradiation on the display panel to be aligned after the second light irradiation treatment, wherein the residual photoreactive monomer is subjected to polymerization reaction under the action of the third light irradiation.
Specifically, the third ultraviolet light is incident on the display panel 100 to be aligned from the side of the second substrate 120 away from the first substrate 110, the third ultraviolet light passes through the second substrate 120 and irradiates the liquid crystal composition, the remaining photoinitiator in the liquid crystal composition is activated under the action of the third ultraviolet light, and the remaining photoreactive monomer after the second irradiation is polymerized under the irradiation of the third ultraviolet light.
The wavelength of the third ultraviolet light is the same as that of the first ultraviolet light L1, and the illumination of the third ultraviolet light is smaller than that of the first ultraviolet light L1, so that the service life of a lamp tube emitting the third ultraviolet light is prolonged while the reaction of the residual photoreaction monomer is ensured.
The time of the third light irradiation is greater than or equal to 60s to ensure that the residual photoreactive monomer is fully reacted. And in the third light irradiation, voltage is not applied to the liquid crystal molecules, and the temperature is 25 ℃ at room temperature.
In this embodiment, compared to the alignment method shown in fig. 1, in the case of ensuring that the pretilt angle difference of the liquid crystal molecules is small, the reaction amount of the photoreactive monomer is further increased, and the anchoring force of the polymer after polymerization of the photoreactive monomer on the liquid crystal molecules is increased.
It is understood that step S106 may also be combined with step S104 and step S105 in fig. 4.
The application also provides a display panel, and the display panel is manufactured by the alignment method of the display panel.
The application also provides a display device, the display device comprises the display panel and the backlight module, and the backlight module is located at the light incident side of the display panel.
The above description of the embodiments is only for assisting understanding of the technical solutions and their core ideas of the present application; those of ordinary skill in the art will understand that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications or substitutions do not depart from the spirit and scope of the present disclosure as defined by the appended claims.
Claims (10)
1. A method for aligning a display panel, the method comprising:
providing a display panel to be aligned, wherein the display panel to be aligned comprises a first substrate, a second substrate, a liquid crystal composition, a first alignment layer and a second alignment layer, the first substrate and the second substrate are oppositely arranged, the first alignment layer is arranged on the surface of the first substrate close to the second substrate, the second alignment layer is arranged on the surface of the second substrate close to the first substrate, the liquid crystal composition is arranged between the first alignment layer and the second alignment layer, and the liquid crystal composition comprises a plurality of liquid crystal molecules and a plurality of photoreaction monomers;
carrying out first light irradiation on the display panel to be aligned, and carrying out polymerization reaction on part of the photoreactive monomer under the first light irradiation;
and carrying out second light irradiation on the display panel to be aligned while loading a first preset voltage on the liquid crystal composition, wherein a plurality of liquid crystal molecules deflect under the action of the first preset voltage, the liquid crystal molecules close to the first alignment layer and the second alignment layer deflect to have preset pretilt angles, and at least part of the rest photoreactive monomers are subjected to polymerization reaction under the second light irradiation.
2. The method according to claim 1, wherein the wavelengths of the light used in the first light irradiation and the second light irradiation are the same, and the duration of the first light irradiation is shorter than the duration of the second light irradiation.
3. The method according to claim 1, wherein before the first light irradiation of the display panel to be aligned, the method further comprises:
and performing static electricity removal treatment on the display panel to be aligned.
4. The alignment method of the display panel according to claim 3, wherein the performing of the static electricity removal treatment on the display panel to be aligned comprises:
and applying a second preset voltage to the liquid crystal composition in the display panel to be matched.
5. The method according to claim 4, wherein after the display panel to be aligned is applied with a second preset voltage and before the first light irradiation is performed on the display panel to be aligned, the method further comprises:
and loading a third preset voltage to the liquid crystal composition in the display panel to be aligned, wherein the third preset voltage is greater than the first preset voltage.
6. The method according to claim 5, wherein the applying of the second preset voltage to the liquid crystal composition in the display panel to be aligned and the applying of the third preset voltage to the liquid crystal composition in the display panel to be aligned are alternated at least twice in sequence.
7. The method for aligning the display panel according to claim 1, wherein after the second light irradiation is performed on the display panel to be aligned, the method further comprises:
and carrying out third light irradiation on the display panel to be aligned after the second light irradiation treatment, wherein the residual photoreactive monomer is subjected to polymerization reaction under the action of the third light irradiation.
8. The method according to claim 1, wherein the display panel to be aligned further comprises a filter layer disposed between the first substrate and the first alignment layer, and wherein the light used for the first light irradiation and the second light irradiation is incident from a side of the second substrate away from the first substrate.
9. The method of claim 1, wherein the first alignment layer and the second alignment layer have a thickness greater than or equal to 70 microns and less than or equal to 100 microns.
10. A display panel produced by the alignment method of the display panel according to any one of claims 1 to 9.
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