CN105954937B - Display panel and preparation method thereof, display device - Google Patents
Display panel and preparation method thereof, display device Download PDFInfo
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- CN105954937B CN105954937B CN201610550951.5A CN201610550951A CN105954937B CN 105954937 B CN105954937 B CN 105954937B CN 201610550951 A CN201610550951 A CN 201610550951A CN 105954937 B CN105954937 B CN 105954937B
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- 238000002360 preparation method Methods 0.000 title claims 2
- 239000004973 liquid crystal related substance Substances 0.000 claims abstract description 104
- 239000000758 substrate Substances 0.000 claims abstract description 70
- 239000004988 Nematic liquid crystal Substances 0.000 claims abstract description 34
- 229920000642 polymer Polymers 0.000 claims abstract description 19
- 239000000178 monomer Substances 0.000 claims abstract description 16
- 238000004519 manufacturing process Methods 0.000 claims abstract description 9
- 239000000203 mixture Substances 0.000 claims description 11
- 125000006850 spacer group Chemical group 0.000 claims description 10
- 239000004642 Polyimide Substances 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 6
- 229920001721 polyimide Polymers 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 4
- NBVXSUQYWXRMNV-UHFFFAOYSA-N fluoromethane Chemical group FC NBVXSUQYWXRMNV-UHFFFAOYSA-N 0.000 claims description 3
- 125000001183 hydrocarbyl group Chemical group 0.000 claims description 3
- 230000005684 electric field Effects 0.000 description 8
- 238000010586 diagram Methods 0.000 description 6
- 230000005540 biological transmission Effects 0.000 description 4
- 238000002834 transmittance Methods 0.000 description 4
- 230000007423 decrease Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- AMGQUBHHOARCQH-UHFFFAOYSA-N indium;oxotin Chemical compound [In].[Sn]=O AMGQUBHHOARCQH-UHFFFAOYSA-N 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 1
Classifications
-
- 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
-
- 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
- G02F1/133753—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers with different alignment orientations or pretilt angles on a same surface, e.g. for grey scale or improved viewing angle
-
- 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
- G02F1/133753—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers with different alignment orientations or pretilt angles on a same surface, e.g. for grey scale or improved viewing angle
- G02F1/133757—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers with different alignment orientations or pretilt angles on a same surface, e.g. for grey scale or improved viewing angle with different alignment orientations
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- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- Mathematical Physics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Liquid Crystal (AREA)
Abstract
The present invention provides a kind of display panel, comprising: array substrate, to box substrate and positioned at the array substrate and the liquid crystal layer between box substrate；The liquid crystal layer includes: nematic liquid crystal and the polymer network that is formed by polymerisable liquid crystal monomer；One of end face of the liquid crystal layer is incidence surface；Oriented layer is provided on the array substrate and the opposite face to box substrate；The oriented layer includes multiple first orientation areas, and multiple first orientation areas are along the direction arrangement for being gradually distance from the incidence surface；Angle between the differently- oriented directivity and default differently- oriented directivity in the first orientation area of at least one oriented layer increases with the first orientation area to the increase of the incidence surface distance.Correspondingly, the present invention also provides a kind of production methods of display panel and a kind of display device.The present invention can be improved the uniformity of display.
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 development of technology, transparent displays gradually step into people's lives and attract the attention of consumers. However, the transmittance of the conventional transparent display device (e.g., liquid crystal display device, organic electroluminescent diode display device) is low, and the response speed is slow. Moreover, most transparent displays only exhibit a transparent state when a voltage is applied, and are normally opaque.
Recently, it has been found that when a Polymer Stabilized Liquid Crystal (PSLC) is used for transparent display, advantages in transparency, response speed, energy saving, etc. are significant. The display panel of such a display device can be used as an optical waveguide plate and can also perform display, which is called waveguide display. The structure of the polymer stabilized liquid crystal based display device is shown in fig. 1a and 1b, a liquid crystal layer 30 is arranged between an array substrate 10 and a pair of cell substrates 20, and the liquid crystal layer 30 comprises nematic liquid crystals 31 and a polymer network 32 formed by polymerizable liquid crystal monomers. The light source 70 emits light to the liquid crystal layer 30 from one side of the display panel, when display is not needed, no voltage is applied to the display panel, the light is horizontally transmitted in the liquid crystal layer 30 (as shown in fig. 1 a), and the display panel is in a transparent state, wherein the transparency can reach more than 90%; when a display is required, a voltage is applied to the display panel to deflect the nematic liquid crystal 31, and the nematic liquid crystal 31 is disoriented by the polymer network 32, so that light is scattered and the display is realized (as shown in fig. 1 b). Compared with the traditional transparent display device, the display device based on the polymer stabilized liquid crystal has higher transmittance and response speed.
However, in the display device with such a structure, as the distance from the pixel region to the light source 70 increases, as shown in fig. 1b, the light introduced into the display panel gradually decreases, and the light scattered by the pixel region also decreases, resulting in poor brightness uniformity of the display panel.
Disclosure of Invention
The present invention is directed to at least one of the technical problems in the prior art, and provides a display panel, a manufacturing method thereof, and a display device, so as to improve the uniformity of the brightness of the display panel.
In order to solve one of the above technical problems, the present invention provides a display panel, including: the liquid crystal display panel comprises an array substrate, a box aligning substrate and a liquid crystal layer positioned between the array substrate and the box aligning substrate; the liquid crystal layer includes: nematic liquid crystals and a polymer network formed from polymerizable liquid crystal monomers; one end face of the liquid crystal layer is a light incident face; the opposite surfaces of the array substrate and the box-aligning substrate are provided with orientation layers; the orientation layer comprises a plurality of first orientation regions which are arranged along the direction gradually far away from the light incident surface; an included angle between the orientation direction of the first orientation region of the at least one orientation layer and the preset orientation direction is increased along with the increase of the distance from the first orientation region to the light incident surface.
Preferably, an included angle between the orientation direction of the first orientation region of each orientation layer and the preset orientation direction increases with the distance from the first orientation region to the light incident surface.
Preferably, the array substrate includes a plurality of pixel regions, the pixel regions are arranged in a plurality of rows and a plurality of columns, each row of pixel regions extends along a direction gradually far away from the light incident surface, and the first alignment regions of the alignment layer correspond to the pixel regions of the plurality of columns of the array substrate one to one.
Preferably, a spacer region is formed between any two adjacent columns of pixel regions of the array substrate, the alignment layer further includes a second alignment region corresponding to the spacer region one by one,
in each alignment layer, the alignment directions of the plurality of second alignment regions are the same; or,
in at least one alignment layer, an included angle between the alignment direction of any one second alignment region and the preset alignment direction is between the alignment directions of the two first alignment regions at two sides of the second alignment region and the preset alignment direction.
Preferably, the orientation directions of the same positions in the two orientation layers are the same.
Preferably, the preset orientation direction is parallel to the display surface of the display panel, or the preset orientation direction is perpendicular to the display surface of the display panel.
Preferably, when the preset orientation direction is parallel to the display surface of the display panel, the light incident surface is an end surface of the liquid crystal layer, which is parallel to the preset orientation direction; when the preset orientation direction is perpendicular to the display surface of the display panel, the light incident surface is any one end surface of the liquid crystal layer.
Preferably, the material from which the alignment layer is made comprises polyimide; when the preset orientation direction is perpendicular to the display surface of the display panel, the main chain of the polyimide is provided with a hydrocarbon side chain or a fluorocarbon side chain.
Preferably, the difference between the orientation direction of any two first orientation zones and the angle between the preset orientation direction is less than 30 °.
Preferably, the mass percentage of the polymer network in the liquid crystal layer is between 2% and 6%.
Preferably, the thickness of the liquid crystal layer is between 3 and 5 μm.
Correspondingly, the invention also provides a manufacturing method of the display panel, which comprises the following steps:
providing an array substrate and a box aligning substrate;
respectively arranging a film layer to be oriented on the array substrate and the box aligning substrate, wherein the film layer to be oriented comprises a plurality of first orientation areas;
respectively orienting the two film layers to be oriented to form two orientation layers;
the array substrate and the opposite-box substrate which are formed with the orientation layers are opposite to each other in a box mode, and a liquid crystal mixture is filled between the array substrate and the opposite-box substrate and comprises nematic liquid crystals and polymerizable liquid crystal monomers;
curing the liquid crystal mixture to form a polymer network of the polymerizable liquid crystal monomer; the cured liquid crystal mixture forms a liquid crystal layer, and one end face of the liquid crystal layer is a light incident face;
the first orientation regions are arranged along the direction gradually far away from the light incident surface, and when at least one film layer to be oriented is oriented, the included angle between the orientation direction of the first orientation regions and the preset orientation direction is increased along with the increase of the distance from the first orientation regions to the light incident surface.
Preferably, in the step of orienting the two film layers to be oriented, a photo-orientation method is used for orientation.
Correspondingly, the invention also provides a display device which comprises a light source and the display panel provided by the invention, wherein the light source is arranged opposite to the light incident surface of the liquid crystal layer so as to emit light rays from the light incident surface to the liquid crystal layer.
In the invention, the included angles between the orientation directions of different regions on the orientation layer and the preset orientation direction are different, the farther the distance from the light source is, the larger the included angle between the orientation direction and the preset orientation direction is, so that the larger the pre-tilt angle of the nematic liquid crystal in the corresponding region is, therefore, when the same electric field is applied to different regions in the display panel, the inclination angle of the nematic liquid crystal at a position close to the light incident surface is smaller, and the amount of light which can be scattered is smaller; the inclination angle of the nematic liquid crystal farther from the light incident surface is larger, and under the voltage driving, the inclination angle is further increased, and the quantity of light rays at the scattering position is increased accordingly. Compared with the prior art, the light rays emitted from the area which is closer to the light incident surface are less, so that the light ray loss is less; the area far away from the light incident surface has more available light and more scattered light rays, so that the display brightness of the area near or far away from the light incident surface is close, and the uniformity of the display brightness of the display panel is improved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
FIG. 1a is a schematic diagram of a display device in a transparent state according to the prior art;
FIG. 1b is a schematic view of the display device of FIG. 1a in a state of displaying;
FIG. 2 is a schematic diagram of a first structure of a display panel according to the present invention;
fig. 3 is a schematic view of a state in which a display device including the display panel of fig. 2 is in a transparent state;
fig. 4 is a schematic view of a state when a display device including the display panel of fig. 2 is used for display;
FIG. 5 is a schematic diagram of a second structure of a display panel according to the present invention;
FIG. 6 is a schematic diagram of a third structure of a display panel according to the present invention;
FIG. 7 is a schematic diagram of a fourth structure of a display panel according to the present invention;
FIG. 8 is a schematic diagram of a fifth structure of a display panel according to the present invention;
fig. 9 is a flowchart of a method for manufacturing a display panel according to the present invention.
Wherein the reference numerals are:
10. an array substrate; 11. a pixel region; 12. a spacer region; 20. a box aligning substrate; 30. a liquid crystal layer; 31. nematic phase liquid crystal; 32. a polymer network; 40. an alignment layer; 41. a first orientation zone; 42. a second orientation zone; 50. a pixel electrode; 60. a common electrode; 70. a light source.
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.
As an aspect of the present invention, there is provided a display panel, a first structure of which is shown in fig. 2 to 4, including: the liquid crystal display device comprises an array substrate 10, an opposite box substrate 20 and a liquid crystal layer 30 positioned between the array substrate 10 and the opposite box substrate 20. The liquid crystal layer 30 includes: nematic liquid crystal 31 and polymer network 32 formed from polymerizable liquid crystal monomers. The polymerizable liquid crystal monomer may specifically be a photopolymerizable liquid crystal monomer, for example, a vinyl group-containing liquid crystal monomer. One of the end surfaces of the liquid crystal layer 30 is a light incident surface. The alignment layer 40 is provided on each of the opposing surfaces of the array substrate 10 and the opposing-cassette substrate 20. The alignment layer 40 includes a plurality of first alignment regions 41, and the first alignment regions 41 are arranged along a direction gradually away from the light incident surface. The included angle between the orientation direction of the first orientation region 41 of the at least one orientation layer 40 and the preset orientation direction increases with the distance from the first orientation region 41 to the light incident surface. That is, the farther from the light incident surface, the larger the angle between the orientation direction on the first orientation region 41 and the preset orientation direction is; the closer the first alignment region 41 is to the light incident surface, the smaller the angle between the alignment direction and the predetermined alignment direction is.
It is understood that the alignment layer 40 enables the adjacent nematic liquid crystal 31 to maintain a specific alignment in the absence of an electric field, thereby forming a pretilt angle. The angle between the alignment direction of the alignment layer 40 and the thickness direction of the display panel, i.e. the angle between the long axis direction of the nematic liquid crystal 31 and the thickness direction of the display panel in the absence of an electric field.
The display panel provided by the invention is particularly suitable for a transparent display device so as to achieve higher transmittance. In addition, the present invention is not limited to the type of the display panel, and the display panel may be, for example, an Electrically Controlled Birefringence (ECB) type display panel or a Vertical Alignment (VA) type display panel. Specifically, as shown in fig. 2 to 4, a pixel electrode 50 is disposed on the array substrate 10, a common electrode 60 is disposed on the cartridge substrate 20, and an electric field is formed between the pixel electrode 50 and the common electrode 60 when a voltage is applied to the two electrodes. Of course, the display panel may also be an In Plane Switching (IPS) display panel or a Fringe Field Switching (FFS) display panel, and In this case, the pixel electrode 50 and the common electrode 60 are disposed on the array substrate 10. The above types of display panels are all common in the art, and the specific structure is not described in detail here. The preset alignment direction may be determined according to a specific type of the display panel, for example, for an electric birefringence type display panel, a coplanar switch type display panel, or a fringe field switching type display panel, it is required to make the liquid crystal in the liquid crystal layer 30 be in a horizontal alignment mode as a whole, and in this case, the preset alignment direction is a horizontal direction parallel to the display surface of the display panel, such as the X direction or the Y direction in fig. 2; in the vertical alignment type display panel, it is necessary to set the entire liquid crystal in the liquid crystal layer 30 to be in a vertical alignment mode, and in this case, as shown in fig. 6 to 8, the preset alignment direction is perpendicular to the display surface (i.e., Z direction) of the display panel.
The light incident surface of the liquid crystal layer 30 is an end surface of the liquid crystal layer 30 facing the light source 70 in the display device including the display panel. As shown in fig. 3, the light source 70 emits light into the liquid crystal layer 30 from the incident surface, and the light is horizontally transmitted in the liquid crystal layer 30. The "distance to the light incident surface" may be regarded as the distance to the light source 70, and is far from the light incident surface, that is, far from the light source 70.
In the prior art, the alignment directions at different positions on the alignment layer 40 are consistent, so that the pretilt angles of the nematic liquid crystal 31 at different positions in the liquid crystal layer are the same, and therefore, when the same amount of incident light enters the nematic liquid crystal 31 in different areas under the condition that an electric field is generated in the display panel, the amount of the light scattered is also the same; since the amount of incident light is reduced in the region farther from the light incident surface, the amount of scattered light is reduced in the region farther from the light incident surface, which causes display luminance non-uniformity. In the invention, the included angle between the alignment direction and the preset alignment direction is larger in the first alignment region 41 on the alignment layer 40 which is farther from the light incident surface, so that the pretilt angle of the nematic liquid crystal 31 which is farther from the light incident surface is larger, therefore, when the same electric field is applied to different regions in the display panel, the inclination angle of the nematic liquid crystal 31 which is closer to the light incident surface is smaller, and the amount of light which can be scattered is smaller; the inclination angle of the nematic liquid crystal 31 farther from the light incident surface is larger, and the inclination angle is further increased under voltage driving, and the amount of light at the scattering position is increased accordingly. Compared with the prior art, the light rays emitted from the area which is closer to the light incident surface are less, so that the light ray loss is less; the regions farther from the light incident surface have more available light and more light rays can be scattered out, so that the display brightness of the regions closer to or farther from the light incident surface is similar (as shown in fig. 4), and the display panel based on the polymer stabilized liquid crystal achieves higher transmittance and improves the uniformity of the display brightness.
Preferably, the included angle between the alignment direction of the first alignment region 41 of each alignment layer 40 and the predetermined alignment direction increases with the distance from the first alignment region 41 to the light incident surface, so that more nematic liquid crystals 31 obtain a larger pretilt angle in the region where the first alignment region 41 is located farther from the light incident surface, so as to ensure that more light rays can be scattered in the farther region.
In the present invention, as shown in fig. 2 to 8, the array substrate 10 includes a plurality of pixel regions 11, the plurality of pixel regions are arranged in a plurality of rows and a plurality of columns, each row of pixel regions 11 extends along a direction gradually away from the light incident surface, i.e., a direction parallel to the light incident surface is a column direction, and a direction perpendicular to the light incident surface is a row direction. The pixel region 11 is a region capable of independently displaying a specific color, such as a red pixel region, a green pixel region, and a blue pixel region. The array substrate 10 further includes a plurality of gate lines and a plurality of data lines, which cross each other to define a plurality of pixel regions 11. The area size of the first alignment region 41 is not particularly limited in the present invention, and the first alignment region 41 may correspond to one or more columns of the pixel regions 11. In order to make the light scattered by the display panel more uniform, it is preferable that, as shown in fig. 2 to 8, the plurality of first alignment regions 41 of the alignment layer 40 correspond to the plurality of rows of pixel regions 11 of the array substrate 10 one to one.
Further, as shown in fig. 2 to 8, a spacer 12 is formed between any two adjacent columns of pixel regions 11 of the array substrate 10, and the alignment layer 40 includes a second alignment region 42 corresponding to the spacer 12, the present invention does not limit the alignment direction of the second alignment region 42, the first arrangement of the alignment direction of the second alignment region 42 is as shown in fig. 2 and 6, in each alignment layer 40, the alignment direction of the plurality of second alignment regions 42 is the same, the alignment direction of the second alignment region 42 may also be set according to the second arrangement that, as shown in fig. 5, 7 and 8, in at least one alignment layer 40, the included angle between the alignment direction of any one second alignment region 42 and the preset alignment direction is between the alignment direction of two first alignment regions 41 on both sides of the second alignment region 42 and the preset alignment direction, for example, the pretilt angle of nematic liquid crystal 31 corresponding to one spacer 12 is α, the pretilt angle of the nematic liquid crystal 31 corresponding to the adjacent column of the spacer 12 and the adjacent column of the pixel regions is equal to the preset alignment direction, or opposite to the pretilt angle of the first alignment region 367, which is equal to the adjacent nematic liquid crystal 31, or opposite to the pretilt angle of the first alignment region 12, which is 367, or 3, which is equal to the pretilt angle of the first alignment region 3, which is smaller than that shown in the first alignment region 12, 367, which is smaller than that is 367, which is shown in the first alignment region 12, or smaller than that in the first alignment region 3, which is shown in fig. 3, 367, which the pretilt 7, which the pretilt angle is needed.
Further, the alignment directions of the same positions in the two alignment layers 40 are the same, so that the alignment of the nematic liquid crystal 31 corresponding to the same column of pixel regions 11 is the same, and the alignment of the nematic liquid crystal 31 corresponding to the same spacer region 12 is the same, thereby facilitating the transmission and scattering of light in the liquid crystal layer.
As described above, the preset direction may be parallel to the display surface of the display panel or perpendicular to the display surface of the display panel. Since the amount of light scattered is large when an electric field is generated in the display panel under the condition that the alignment direction of the liquid crystal is perpendicular to the transmission direction of the light, it is preferable that the preset alignment direction is parallel to the light incident surface, so that when the light of the light source 70 is incident into the liquid crystal layer 30 from the light incident surface, the transmission direction of the light in the liquid crystal layer 30 is perpendicular to the alignment direction of the liquid crystal. Specifically, when the preset direction is parallel to the display surface of the display panel, the light incident surface is an end surface of the liquid crystal layer 30, which is parallel to the preset alignment direction; when the preset orientation direction is perpendicular to the display surface of the display panel, the light incident surface is any one end surface of the liquid crystal layer 30. And the end face parallel to the preset direction is formed into the light incident face. For example, when the predetermined direction is the X direction as shown in fig. 2 to 5, the light incident surface is an end surface on the left side or the right side of the liquid crystal layer 30; when the preset alignment direction is a Z direction as shown in fig. 6 to 8, the light incident surface is any one end surface of the liquid crystal layer 30.
In the present invention, the material of which the alignment layer 40 is made includes polyimide. Wherein, when the preset orientation direction is perpendicular to the display surface of the display panel, i.e. vertical orientation, in order to better orient the orientation layer 40, it is preferable that the polyimide has a main chain with a hydrocarbon side chain or a fluorocarbon side chain.
It is considered that when the difference between the pretilt angle of the nematic liquid crystal 31 farther from the light incident surface and the pretilt angle of the nematic liquid crystal 31 closer to the light incident surface is too large, the uniformity of the emitted light is also affected. To prevent this, the difference between the orientation directions of any two first orientation regions 41 and the preset orientation direction is less than 30 °. That is, the difference between the pretilt angles of the nematic liquid crystal 31 in the pixel region 11 in the row closest to the light incident surface and the pretilt angle of the nematic liquid crystal 31 in the pixel region 11 in the row farthest from the light incident surface is less than 30 °.
When the proportion of the polymer network 32 in the liquid crystal layer 30 is too small, the scattering of light is not significant; when the proportion of the polymer network 32 in the liquid crystal layer 30 is large, the influence on the deflection of the nematic liquid crystal 31 is large, resulting in excessively high driving voltage and large power consumption. In view of the above, it is preferable that the mass percentage of the polymer network 32 in the liquid crystal layer 30 is between 2% and 6% (when filling liquid crystal, the mass percentage of the polymerizable liquid crystal monomer in the liquid crystal layer 30 is in a range of 2% to 6%), so as to ensure that the display panel has a good scattering effect and effectively reduce the driving voltage.
It should be noted that, in order to ensure that the light can be transmitted forward in the liquid crystal layer 30 and the light output amount is large when the light is scattered, it is preferable that two kinds of liquid crystals in the liquid crystal layer 30 are made of materials with similar properties and good compatibility, and the difference of dielectric constant of each kind of liquid crystal is large. In addition, the substrates of the array substrate 10 and the opposing substrate 20 are usually glass, and in this case, the refractive index of the pixel electrode 50 and the common electrode 60 should be greater than that of glass, for example, the pixel electrode 50 and the common electrode 60 are made to include Indium Tin Oxide (ITO), so that light is totally reflected on the opposite surfaces of the array substrate 10 and the opposing substrate 20 as much as possible, and is prevented from exiting the display panel.
In addition, when the thickness of the liquid crystal layer 30 of the display panel is large, the driving voltage is caused to be large; when the thickness of the liquid crystal layer 30 is small, the transmission effect of light in the liquid crystal layer 30 is poor; therefore, the thickness of the liquid crystal layer 30 of the display panel can be selected to be 3-10 μm, so that the display panel can play a good light guide role, and meanwhile, the driving voltage can be reduced.
As another aspect of the present invention, there is provided a manufacturing method of the display panel, as shown in fig. 9, the manufacturing method including:
and S1, providing an array substrate and a box aligning substrate.
S2, arranging film layers to be oriented on the array substrate and the box aligning substrate respectively, wherein the film layers to be oriented comprise first orientation areas corresponding to the pixel areas one to one.
And S3, respectively orienting the two film layers to be oriented to form two orientation layers.
And S4, aligning the array substrate with the alignment layer and the aligning substrate with the box, and filling a liquid crystal mixture between the array substrate and the aligning substrate, wherein the liquid crystal mixture comprises nematic liquid crystal and polymerizable liquid crystal monomer. Wherein the mass percentage of the polymerizable liquid crystal monomer in the liquid crystal mixture is preferably between 2% and 6%.
S5, curing the liquid crystal mixture to enable the polymerizable liquid crystal monomer to form a polymer network; the cured liquid crystal mixture forms a liquid crystal layer, and one end face of the liquid crystal layer is a light incident face.
The first orientation regions are arranged along the direction gradually far away from the light incident surface; when at least one film layer to be oriented is oriented in step S3, an included angle between the orientation direction of the first orientation region and the preset orientation direction increases with an increase in the distance from the first orientation region to the light incident surface.
When the width of the first alignment region is small, the alignment accuracy is required to be high, and in order to improve the alignment accuracy, in step S3, alignment is performed by a photo-alignment method.
As a third aspect of the present invention, there is provided a display device including a light source and the above-described display panel, as shown in fig. 3 and 4, the light source 70 is disposed opposite to the incident surface of the liquid crystal layer 30 to emit light into the liquid crystal layer 30 from the incident surface.
As can be seen from the above description, in the present invention, the included angles between the alignment directions of the different regions on the alignment layer and the preset alignment direction are also different, and the farther away from the light source, the larger the included angle between the alignment direction and the preset alignment direction, so that the larger the pre-tilt angle of the nematic liquid crystal in the corresponding region is, therefore, when the same electric field is applied to the different regions in the display panel, the smaller the tilt angle of the nematic liquid crystal at the position closer to the light incident surface, and the smaller the amount of light that can be scattered; the inclination angle of the nematic liquid crystal farther from the light incident surface is larger, and under the voltage driving, the inclination angle is further increased, and the quantity of light rays at the scattering position is increased accordingly. Compared with the prior art, the light rays emitted from the area which is closer to the light incident surface are less, so that the light ray loss is less; the area far away from the light incident surface has more available light and more scattered light rays, so that the display brightness of the area near or far away from the light incident surface is close, and the uniformity of the display brightness of the display panel is improved.
It will be understood that the above embodiments are merely exemplary embodiments taken to illustrate the principles of the present invention, which is not limited thereto. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit and substance of the invention, and these modifications and improvements are also considered to be within the scope of the invention.
Claims (14)
1. A display panel, comprising: the liquid crystal display panel comprises an array substrate, a box aligning substrate and a liquid crystal layer positioned between the array substrate and the box aligning substrate; the liquid crystal layer includes: nematic liquid crystals and a polymer network formed from polymerizable liquid crystal monomers; one end face of the liquid crystal layer is a light incident face; the opposite surfaces of the array substrate and the box-aligning substrate are provided with orientation layers; it is characterized in that the preparation method is characterized in that,
the orientation layer comprises a plurality of first orientation regions which are arranged along the direction gradually far away from the light incident surface; an included angle between the orientation direction of the first orientation region of the at least one orientation layer and the preset orientation direction is increased along with the increase of the distance from the first orientation region to the light incident surface.
2. The display panel according to claim 1, wherein an included angle between the alignment direction of the first alignment region of each alignment layer and the preset alignment direction increases with the distance from the first alignment region to the light incident surface.
3. The display panel of claim 1, wherein the array substrate includes a plurality of pixel regions, the plurality of pixel regions are arranged in a plurality of rows and a plurality of columns, each row of pixel regions extends in a direction gradually away from the light incident surface, and the plurality of first alignment regions of the alignment layer correspond to the plurality of columns of pixel regions of the array substrate one to one.
4. The display panel according to claim 3, wherein a spacer region is formed between any two adjacent columns of pixel regions of the array substrate, the alignment layer further comprises a second alignment region corresponding to the spacer region one by one,
in each alignment layer, the alignment directions of the plurality of second alignment regions are the same; or,
in at least one alignment layer, an included angle between the alignment direction of any one second alignment region and the preset alignment direction is between the alignment directions of the two first alignment regions at two sides of the second alignment region and the preset alignment direction.
5. The display panel according to any one of claims 1 to 4, wherein the alignment directions of the same position in the two alignment layers are the same.
6. The display panel according to any one of claims 1 to 4, wherein the preset orientation direction is parallel to a display surface of the display panel, or wherein the preset orientation direction is perpendicular to the display surface of the display panel.
7. The display panel according to claim 6, wherein when the preset alignment direction is parallel to the display surface of the display panel, the light incident surface is an end surface of the liquid crystal layer parallel to the preset alignment direction; when the preset orientation direction is perpendicular to the display surface of the display panel, the light incident surface is any one end surface of the liquid crystal layer.
8. The display panel according to claim 6, wherein a material of which the alignment layer is made comprises polyimide; when the preset orientation direction is perpendicular to the display surface of the display panel, the main chain of the polyimide is provided with a hydrocarbon side chain or a fluorocarbon side chain.
9. A display panel as claimed in any one of claims 1 to 4 characterized in that the difference between the orientation directions of any two first orientation zones and the preset orientation direction is less than 30 °.
10. A display panel as claimed in any one of claims 1 to 4 characterized in that the mass percentage of the polymer network in the liquid crystal layer is between 2 and 6%.
11. The display panel according to any one of claims 1 to 4, wherein the liquid crystal layer has a thickness of 3 to 5 μm.
12. A method for manufacturing a display panel according to any one of claims 1 to 11, comprising:
providing an array substrate and a box aligning substrate;
respectively arranging a film layer to be oriented on the array substrate and the box aligning substrate, wherein the film layer to be oriented comprises a plurality of first orientation areas;
respectively orienting the two film layers to be oriented to form two orientation layers;
the array substrate and the opposite-box substrate which are formed with the orientation layers are opposite to each other in a box mode, and a liquid crystal mixture is filled between the array substrate and the opposite-box substrate and comprises nematic liquid crystals and polymerizable liquid crystal monomers;
curing the liquid crystal mixture to form a polymer network of the polymerizable liquid crystal monomer; the cured liquid crystal mixture forms a liquid crystal layer, and one end face of the liquid crystal layer is a light incident face;
the first orientation regions are arranged along the direction gradually far away from the light incident surface, and when at least one film layer to be oriented is oriented, the included angle between the orientation direction of the first orientation regions and the preset orientation direction is increased along with the increase of the distance from the first orientation regions to the light incident surface.
13. The method according to claim 12, wherein in the step of orienting the two film layers to be oriented, the orientation is performed by a photo-orientation method.
14. A display device comprising a light source and the display panel of any one of claims 1 to 11, wherein the light source is disposed opposite to a light incident surface of the liquid crystal layer to emit light into the liquid crystal layer from the light incident surface.
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| CN107991814B (en) * | 2017-12-25 | 2021-04-30 | Tcl华星光电技术有限公司 | Liquid crystal display panel and preparation method thereof |
| CN108873457B (en) * | 2018-07-16 | 2021-01-26 | 京东方科技集团股份有限公司 | Reflective liquid crystal display panel, display device and driving method thereof |
| US10824024B2 (en) * | 2018-08-23 | 2020-11-03 | Innolux Corporation | Electronic apparatus |
| CN113238415B (en) * | 2021-05-13 | 2023-05-23 | 北京京东方技术开发有限公司 | Transparent display panel and display device |
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| CN1116722A (en) * | 1993-09-18 | 1996-02-14 | 株式会社金星社 | Method for forming an orientation film of photopolymer in a liquid crystal display |
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| JP2012027150A (en) * | 2010-07-21 | 2012-02-09 | Casio Comput Co Ltd | Method for manufacturing polymer dispersion type liquid crystal display element, and the display element |
| CN104317093A (en) * | 2014-11-20 | 2015-01-28 | 京东方科技集团股份有限公司 | Liquid crystal display device and manufacturing method thereof |
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