CN113671755A - Alignment method of liquid crystal panel, liquid crystal panel and display device - Google Patents
Alignment method of liquid crystal panel, liquid crystal panel and display device Download PDFInfo
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- G—PHYSICS
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- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- 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
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- G—PHYSICS
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- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1337—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers
- G02F1/133707—Structures for producing distorted electric fields, e.g. bumps, protrusions, recesses, slits in pixel electrodes
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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
- G02F1/1341—Filling or closing of cells
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Abstract
The invention provides an alignment method of a liquid crystal panel, the liquid crystal panel and a display device. The alignment method of the liquid crystal panel comprises the following steps: forming a first electrode having a slit and a first alignment film covering the first electrode on a first substrate; forming a second electrode and a second alignment film covering the second electrode on a second substrate; irradiating the first alignment film or the second alignment film by using ultraviolet light to form alignment force; liquid crystal is dropped and attached to the first substrate and the second substrate to form a liquid crystal layer between the first substrate and the second substrate. The alignment method of the liquid crystal panel provided by the invention can reduce the exposure dark line at the division position of the pixel so as to improve the transmittance.
Description
Technical Field
The invention relates to the technical field of manufacturing of display equipment, in particular to an alignment method of a liquid crystal panel, the liquid crystal panel and a display device.
Background
Liquid Crystal Displays (LCDs) have many advantages such as thin body, power saving, and no radiation, and are widely used, such as Liquid Crystal televisions, mobile phones, personal digital assistants, digital cameras, computer screens, or notebook computer screens. Currently, TFT-LCD liquid crystal panels can be classified into three major types, namely twisted nematic/super twisted nematic (TN/STN) type, in-plane switching (IPS) type, and Vertical Alignment (VA) type. And UV induced multi-domain vertical alignment (UV)2A) The title of the optical alignment technology for VA-type liquid crystal panel is derived from multiplication of Ultraviolet (UV) and VA mode of liquid crystal panel, and the principle is to use UV light to realize precise alignment control of liquid crystal molecules2The a technique can realize the state that all liquid crystal molecules are tilted to the design direction through the alignment film, so that the liquid crystal molecules can be simultaneously tilted to the same direction when an electric field is applied, the response speed is increased to 2 times of the original speed, and since it does not use protrusionsAnd slits can be divided into a plurality of regions, so that the aperture ratio is remarkably improved compared with the conventional method of forming a plurality of regions by using projections, and the method has the advantages of reducing power consumption, saving cost and the like.
Existing UV2The a alignment is to divide the substrate into a plurality of regions to partially change the alignment direction. As shown in fig. 1, in the alignment mode of one pixel 4 region, the opening region of the mask for ultraviolet alignment is the distance of the long side 1/4 of the pixel, and is matched with the WG spliced polarizer structure (i.e. a polarizer for obtaining 45-degree polarized light), the ultraviolet alignment forms a 45 ° alignment direction in the first exposure (wherein, the arrow is horizontal and points to the right side of fig. 1 as 0 ° direction, the alignment force angle is recorded clockwise), the 135 ° alignment direction in the second exposure, and the 225 ° alignment direction in the third exposure. The fourth exposure forms a 315 ° alignment direction. Thereby forming a UV2A exposure pattern in a shape of a Chinese character mu.
However, the above-described UV2A exposure system in the form of a "mu" pattern causes dark exposure lines to be formed at the pixel division, which reduces the transmittance.
Disclosure of Invention
The invention provides an alignment method of a liquid crystal panel, the liquid crystal panel and a display device, which can reduce exposure dark lines at the division positions of pixels so as to improve the transmittance.
In a first aspect, the present invention provides an alignment method for a liquid crystal panel, including the steps of:
forming a first electrode having a slit and a first alignment film covering the first electrode on a first substrate;
forming a second electrode and a second alignment film covering the second electrode on a second substrate;
irradiating the first alignment film or the second alignment film by using ultraviolet light to form alignment force;
liquid crystal is dropped and attached to the first substrate and the second substrate to form a liquid crystal layer between the first substrate and the second substrate.
As an alternative mode, in the alignment method of a liquid crystal panel according to an embodiment of the present invention, dropping a liquid crystal and attaching a first substrate and a second substrate to form a liquid crystal layer between the first substrate and the second substrate includes:
dripping liquid crystal on a first alignment film of a first substrate, and attaching the first substrate and a second substrate, wherein the first substrate is an array substrate, and liquid crystal molecules with a chiral layered structure are arranged in the liquid crystal;
the liquid crystal molecules form a liquid crystal layer which rotates layer by layer under the action of a twisting force generated by the alignment force and the viscosity between the liquid crystal molecules.
As an alternative mode, in the alignment method of a liquid crystal panel provided in an embodiment of the present invention, the step of forming a liquid crystal layer that rotates layer by layer under the action of a twisting force generated by an alignment force and a viscosity between liquid crystal molecules includes:
under the action of the alignment force and the twisting force generated by the viscosity between the liquid crystal molecules, the liquid crystal molecules form a liquid crystal layer which obliquely spirally turns upwards layer by layer;
the long axes of the liquid crystal molecules in the same layer in the liquid crystal layer are arranged in the same direction, and the liquid crystal molecules in the same layer in the liquid crystal layer rotate for a preset angle relative to the long axes of the liquid crystal molecules in the next layer, so that the long axes of the liquid crystal molecules in the liquid crystal layer are sequentially spirally upward at the preset angle.
As an alternative, in the alignment method of the liquid crystal panel provided in the embodiment of the present invention, the direction of the deflection of the liquid crystal molecules is opposite to the direction of the alignment force.
As an alternative mode, in the alignment method of the liquid crystal panel provided in the embodiment of the present invention, the pitch of the liquid crystal molecules is 9.6 μm to 40 μm.
As an optional mode, in the alignment method of the liquid crystal panel provided in the embodiment of the present invention, the thickness of the liquid crystal layer is in a range from 3.2 μm to 4.0 μm.
As an alternative, in the alignment method of a liquid crystal panel provided in the embodiment of the present invention, the number of the slits is at least two, a distance between two adjacent slits is in a range from 6.0 μm to 8.0 μm, and a width of the slit is in a range from 3.0 μm to 4.0 μm.
As an alternative, in the alignment method of a liquid crystal panel provided in the embodiment of the present invention, the extending direction of the slit is parallel to the direction of the alignment force.
In a second aspect, the present invention provides a liquid crystal panel, which is aligned by the above-mentioned alignment method of the liquid crystal panel.
In a third aspect, the present invention provides a display device, including the above liquid crystal panel.
The invention provides an alignment method of a liquid crystal panel, the liquid crystal panel and a display device, wherein the alignment method of the liquid crystal panel is characterized in that at least one slit is arranged on a first electrode of a first substrate, the slit can limit liquid crystal molecule arrangement from space so as to strengthen alignment force, and therefore exposure dark lines at the division positions of pixels are reduced, and transmittance is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic plan view of a prior art alignment of 4 regions of a pixel;
fig. 2 is a flowchart of an alignment method of a liquid crystal panel according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a liquid crystal panel aligned by an alignment method of a liquid crystal panel according to an embodiment of the invention;
FIG. 4 is a side view of the liquid crystal molecules in the alignment process of FIG. 2;
FIG. 5 is a bottom view of the liquid crystal molecules in the alignment process of FIG. 2;
FIG. 6 is a structural diagram of a liquid crystal molecule in the alignment method of FIG. 2;
fig. 7 is a schematic plan view of a pixel in a first substrate in an alignment method of a liquid crystal panel according to an embodiment of the invention;
fig. 8 is a diagram illustrating a position of a first uv light irradiation in an alignment method of a liquid crystal panel according to an embodiment of the invention;
FIG. 9 is a schematic diagram of FIG. 8 using chiral liquid crystal molecule rotation;
FIG. 10 is a schematic view of FIG. 8 using the rotation of nematic liquid crystal molecules;
FIG. 11 is a diagram illustrating an effect of a pixel in the alignment method of FIG. 8;
FIG. 12 is a graph showing thickness and transmittance of a liquid crystal layer using the alignment method of FIG. 8;
fig. 13 is a diagram illustrating a second uv irradiation position in an alignment method of a liquid crystal panel according to an embodiment of the invention;
FIG. 14 is a schematic representation of FIG. 13 using chiral liquid crystal molecule rotation;
FIG. 15 is a graph showing thickness and transmittance of a liquid crystal layer using the alignment method of FIG. 13;
fig. 16 is a diagram illustrating an effect of one pixel in the alignment method of fig. 13.
Description of reference numerals:
10-a liquid crystal panel;
20-a first substrate; 201-a first alignment film; 202-a first electrode; 2021-slit; 203-pixels;
30-a second substrate; 301 — a second alignment film; 302-a second electrode;
40-a liquid crystal layer; 401-liquid crystal molecules;
a-first exposure; b-second exposure; c-third exposure; d-fourth exposure; e-a first orientation zone; f-a second orientation region; g-a third orientation zone; h-a fourth orientation zone; i-alignment force; m-distance; n-width; j-pitch.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "between" and the like indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplification of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.
The existing TFT-LCD liquid crystal panels can be classified into three major types, namely, twisted nematic/super twisted nematic (TN/STN) type, in-plane switching (IPS) type, and Vertical Alignment (VA) type. And UV induced multi-domain vertical alignment (UV)2A) The title of the optical alignment technology for VA-type liquid crystal panel is derived from multiplication of Ultraviolet (UV) and VA mode of liquid crystal panel, and the principle is to use UV light to realize precise alignment control of liquid crystal molecules2The a technique can realize a state in which all liquid crystal molecules are tilted in a design direction by the alignment film, so that the liquid crystal molecules can be tilted in the same direction at the same time when an electric field is applied, the response speed is increased by 2 times, and the aperture ratio is equal to the original aperture ratio because the liquid crystal molecules can be divided into a plurality of regions without using projections and slitsCompared with the method of forming multiple areas by using the protrusions, the method has the advantages of reducing power consumption, saving cost and the like.
Fig. 1 is a schematic plan view of the alignment of 4 regions of a pixel in the prior art. As shown in fig. 1, in the alignment mode of one pixel 4 region, the opening region of the mask for ultraviolet alignment is the distance of the long side 1/4 of the pixel, and is matched with the WG spliced polarizer structure (i.e. a polarizer for obtaining 45-degree polarized light), the first exposure a of ultraviolet alignment forms a 45 ° alignment direction (where the arrow is horizontal and the direction pointing to the right side of fig. 1 is 0 ° direction, and the angle of the alignment force i is recorded clockwise), the second exposure b forms a 135 ° alignment direction, and the third exposure c forms a 225 ° alignment direction. The fourth exposure d forms a 315 ° alignment direction. Thereby forming a UV2A exposure pattern in a shape of a Chinese character mu. However, the above-described UV2A exposure system in the form of a "mu" pattern causes dark exposure lines to be formed at the pixel division, which reduces the transmittance.
Accordingly, the embodiments of the present invention provide an alignment method for a liquid crystal panel, which can reduce the exposure dark line at the division of the pixel to improve the transmittance.
First embodiment
Fig. 2 is a flowchart of an alignment method of a liquid crystal panel according to an embodiment of the present invention; fig. 3 is a schematic structural diagram of a liquid crystal panel aligned by an alignment method of a liquid crystal panel according to an embodiment of the invention. Referring to fig. 2 and 3, an embodiment of the present invention provides an alignment method for a liquid crystal panel, including the following steps:
s101, forming a first electrode with a slit on a first substrate and a first alignment film covering the first electrode.
Specifically, the first substrate 20 may be an array substrate (may also be referred to as a TFT substrate). The first substrate 20 is covered with a first electrode 202, and the first electrode 202 is covered with a first alignment film 201. In a specific implementation, the first electrode 202 is a transparent electrode, and an ITO thin film may be used as the transparent electrode. ITO (indium tin oxide) is a semiconductor transparent film. The ITO film has good transparency and conductivity, and also has good chemical stability, thermal stability and good pattern processing characteristics. The ITO thin film may be prepared by evaporation, sputtering, reactive ion plating, chemical vapor deposition, thermal spray coating, and the like.
A slit 2021 is provided on the first electrode 202. Among them, the number of the slits 2021 may be one or at least two. The slit 2021 can spatially restrict the arrangement of liquid crystal molecules, thereby enhancing the alignment. In a specific implementation, the first electrode 202 is formed on the first substrate 20, and then the slit 2021 is formed on the first electrode 202 by a photolithography process.
And S102, forming a second electrode on the second substrate and a second alignment film covering the second electrode.
Specifically, the second substrate 30 may be a color film substrate. Wherein the second electrode 302 is formed on the second substrate 30, the second alignment film 301 is formed on the second electrode 302, and the second electrode 302 may be a transparent electrode. The material of the second electrode 302 may be the same as the material of the first electrode 202.
It should be noted that S101 and S102 are only descriptions of different operation steps, and there is no order, and S102 may be executed first, and S101 is executed.
S103, irradiating the first alignment film or the second alignment film with ultraviolet light to form an alignment force.
Specifically, ultraviolet light is emitted by the light source, and the ultraviolet light passes through the first alignment film 201 or the second alignment film 301, so as to align the first substrate 20 or the second substrate 30, thereby forming an alignment force.
Wherein the wavelength of the ultraviolet light can be 100-400nm, and the exposure of the ultraviolet light (also called the radiation illumination of the ultraviolet light) can be 10-1000mJ/cm2The irradiation time of the ultraviolet light may be 10 to 200 seconds.
S104, liquid crystal is dropped and the first substrate 20 and the second substrate 30 are attached to form the liquid crystal layer 40 between the first substrate 20 and the second substrate 30.
Specifically, the first substrate 20 and the second substrate 30 are bonded in pair by One Drop Filling (ODF) under vacuum. The liquid crystal dropping vacuum pairing and gluing can comprise the processes of liquid crystal dropping, frame glue coating, vacuum gluing, frame glue curing and the like. The liquid crystal dripping vacuum pair-assembling and attaching is not limited by factors such as box thickness, orientation film properties, panel size and the like, automation can be realized, the liquid crystal injection time is shortened, meanwhile, the process steps are reduced, the box forming process is simplified, and the utilization rate of liquid crystal materials can be increased.
Wherein the thickness of the liquid crystal layer 40 ranges from 3.2 μm to 4.0. mu.m.
In the alignment method of the liquid crystal panel provided by the embodiment of the invention, by arranging the at least one slit 2021 on the first electrode 202, the slit 2021 can spatially limit the arrangement of liquid crystal molecules to enhance the alignment force, so that the exposure dark lines at the division positions of the pixels are reduced, and the transmittance is improved.
FIG. 4 is a side view of the liquid crystal molecules in the alignment process of FIG. 2; FIG. 5 is a bottom view of the liquid crystal molecules in the alignment process of FIG. 2; FIG. 6 is a structural diagram of a liquid crystal molecule in the alignment method of FIG. 2. Referring to fig. 2 to 4, dropping and attaching the liquid crystal to the first substrate and the second substrate to form the liquid crystal layer between the first substrate and the second substrate may include: liquid crystal is dropped on the first alignment film 201 of the first substrate 20, and the first substrate 20 and the second substrate 30 are bonded. The liquid crystal molecules 401 form a liquid crystal layer 40 that rotates layer by layer under the action of a twisting force generated by an alignment force and viscosity between the liquid crystal molecules 401, wherein the liquid crystal molecules 401 have a chiral layered structure in the liquid crystal.
After the alignment of the first substrate 20 or the second substrate 30 is completed, a pretilt angle of the alignment film is formed on the surface of the first alignment film 201 or the surface of the second alignment film 301, liquid crystals on the surface of the first substrate 20 or the second substrate 30 are arranged depending on the pretilt angle after the liquid crystals are dripped, long axes of liquid crystal molecules 401 in the same layer in the liquid crystal layer are arranged in the same direction, and the liquid crystal molecules 401 in the same layer in the liquid crystal layer rotate by a preset angle relative to the long axes of the liquid crystal molecules 401 in the next layer, so that the long axes of the liquid crystal molecules in the liquid crystal layer are sequentially spirally upward at the preset angle. Wherein the direction of the deflection of the liquid crystal molecules 401 is opposite to the direction of the alignment force. Therefore, under the action of the alignment force, the photosensitive molecules in the first alignment film 201 or the second alignment film 301 tilt in the direction opposite to the alignment force to form a pre-tilt angle.
As can be seen from fig. 4 to 6, the liquid crystal molecules 401 in the same layer rotate in two directions, and the rotation in the first direction gradually increases the angle between the surface of the first alignment film 201 or the surface of the second alignment film 301 (i.e. the angle between the long axis of the liquid crystal molecules 401 and the plane where XY is located in fig. 6) under the driving of the alignment force. The rotation in the second direction is gradually increased with respect to an angle between planes perpendicular to the surface of the first alignment film 201 or the surface of the second alignment film 301 (i.e., an angle between the long axis of the liquid crystal molecules 401 and a plane in which YZ is present in fig. 6) by a twisting force generated by the viscosity between the liquid crystal molecules 401. Alternatively, the pitch j of the liquid crystal molecules 401 is 9.6 μm to 40 μm. After the long axis of the liquid crystal molecules 401 of the liquid crystal layer 40 rotates 360 degrees along the XY plane direction, the distance between the first layer of liquid crystal molecules 401 and the last layer of liquid crystal molecules 401 is the rotation pitch j.
The material of the liquid crystal molecules 401 is similar to the reverse TN mode, combining the TN mode liquid crystal formula:
where Δ nd is the effective propagation distance of the liquid crystal and λ is the backlight wavelength. The larger the Delta nd is, the higher the transmission efficiency, the comprehensive consideration of the visual angle and the taste influence, and the better effect of the Delta nd between 420nm and 430 nm.
Fig. 7 is a schematic plan view of a pixel in the first substrate in the alignment method of the liquid crystal panel according to the embodiment of the invention. Referring to fig. 7, in the present embodiment, the number of the slits 2021 may be at least two, the distance m between two adjacent slits 2021 ranges from 6.0 μm to 8.0 μm, and the width n of the slits 2021 ranges from 3.0 μm to 4.0 μm. By adopting the arrangement of the width of the slit 2021 and the distance between two adjacent slits 2021, the effect of limiting the arrangement of liquid crystal molecules is better, and the alignment force is more uniform.
In the present embodiment, the inclination angle of the slit 2021 may be 45 ° or 135 °, as long as the inclination direction of the slit 2021 is parallel to the alignment force i. In a conventional UV2A exposure mode in a shape like a Chinese character 'mu', a pixel is divided into four regions by a polarizing plate and a mask, specifically, the first substrate 20 includes the pixel 203, the pixel 203 has a first alignment region e, a second alignment region f, a third alignment region g and a fourth alignment region h which are sequentially arranged along a long side direction of the pixel 203, the first alignment region e, the second alignment region f, the third alignment region g and the fourth alignment region h are sequentially exposed, and directions i of alignment forces of the first alignment region e, the second alignment region f, the third alignment region g and the fourth alignment region h are different;
the slit 2021 located in the first and fourth alignment regions e and h makes an angle of 135 ° with the short side of the pixel 203, and the slit 2021 located in the second and third alignment regions f and g makes an angle of 45 ° with the short side of the pixel 203.
In the present embodiment, the alignment force at the time of ultraviolet irradiation is enhanced by setting the extending direction (oblique direction) of the slit 2021 to be parallel to the direction of the alignment force i.
The following describes the alignment method of the liquid crystal panel provided in this embodiment according to different positions of the ultraviolet light irradiation.
Second embodiment
Fig. 8 is a diagram illustrating a position of a first uv light irradiation in an alignment method of a liquid crystal panel according to an embodiment of the invention; fig. 9 is a schematic view of fig. 8 using rotation of chiral liquid crystal molecules, and fig. 12 is a schematic view of fig. 8 using rotation of nematic liquid crystal molecules. Referring to fig. 8, the first alignment method may include,
s201, a first electrode 202 having a slit 2021 and a first alignment film 201 covering the first electrode 202 are formed on the first substrate 20. The width of the slit 2021 is 3.0 μm, and the distance between two adjacent slits 2021 is 6.5 μm.
S202, forming a second electrode 302 on the second substrate 30 and a second alignment film 301 covering the second electrode 302.
S303, the first substrate 20 is irradiated with ultraviolet light.
S304, liquid crystal is dropped and the first substrate 20 and the second substrate 30 are attached to form the liquid crystal layer 40 between the first substrate 20 and the second substrate 30.
In fig. 7, one surface of the first electrode 202 of the first substrate 20 and one surface of the second electrode 302 of the second substrate 30 face the observer, and the right-side view in fig. 7 is a schematic view of the pair bonding of the first substrate 20 and the second substrate 30, and the second substrate 301 is removed to present the first substrate 20 and the second electrode 302 to the observer. In the first alignment method, the liquid crystal molecules 401 on the first substrate 20 side are more stable under the dual action of the alignment force i and the space of the slit 2021. Δ nd on the first substrate 20 side is large, and the propagation efficiency is high. The second substrate 30 side is not aligned, and the second electrode 202 on the second substrate 30 has no slit design, so that Δ nd is small and the propagation efficiency is not high.
Fig. 11 is a diagram illustrating an effect of one pixel in the alignment method of fig. 8. Referring to fig. 9 and 11, fig. 9 is a schematic view illustrating the rotation of liquid crystal molecules aligned for the liquid crystal layer 40 using liquid crystal molecules 401 having a chiral layered structure in the first alignment mode. In the first alignment mode, the liquid crystal molecules 401 are in a reverse TN mode, and dark lines at the spliced portion after the liquid crystal molecules 401 are spirally wound are eliminated. The thickness (Cell Gap) of the liquid crystal layer 40 in fig. 9 is 4.0 μm.
FIG. 10 is a schematic view of the rotation of the nematic liquid crystal molecules in FIG. 8. Fig. 10 is a schematic view showing the rotation of liquid crystal molecules in the first alignment mode, in which the liquid crystal layer 40 is aligned using Nematic liquid crystal (Nematic) molecules. In the first alignment mode, the nematic liquid crystal is in an ECB alignment mode (electronically controlled birefringence mode).
FIG. 12 is a graph showing thickness and transmittance of a liquid crystal layer using the alignment method of FIG. 8. Fig. 12 is a graph showing transmittance of the first alignment method using nematic liquid crystal molecules and liquid crystal molecules 401 having a chiral layered structure, respectively. In fig. 12, the abscissa represents the thickness (in μm) of the liquid crystal layer 40. The ordinate represents the luminance value (in units%), the rotational pitch of liquid crystal molecules in Chiral-1 is 9.6 μm, the rotational pitch of liquid crystal molecules in Chiral-2 is 12.8 μm, the rotational pitch of liquid crystal molecules in Chiral-3 is 40 μm, and Nematic liquid crystal molecules in Chiral-1. As can be seen from FIG. 12, the brightness of the nematic liquid crystal molecules is highest at a cell thickness of 3.4 μm; when the thickness of the Chiral-1 box is 3.6 mu m, the brightness is highest; when the thickness of the Chiral-2 box is 4.0 mu m, the brightness is highest; chiral-3 has the highest brightness at a cell thickness of 3.6 μm.
It should be noted that the brightness test data is based on the same backlight device, and the brightness of the center position of the sample is measured.
Third embodiment
Fig. 13 is a diagram illustrating a second uv irradiation position in an alignment method of a liquid crystal panel according to an embodiment of the invention; FIG. 14 is a schematic representation of FIG. 13 using chiral liquid crystal molecule rotation; fig. 16 is a diagram illustrating an effect of one pixel in the alignment method of fig. 13. Referring to fig. 13 and 16, in the second alignment mode, a step may be,
s301, a first electrode 202 having a slit 2021 and a first alignment film 201 covering the first electrode 202 are formed on the first substrate 20. The width of the slit 2021 is 3.0 μm, and the distance between two adjacent slits 2021 is 6.5 μm.
S302, a second electrode 302 and a second alignment film 301 covering the second electrode 302 are formed on the second substrate 30.
S303, the second substrate 30 is irradiated with ultraviolet light.
S304, liquid crystal is dropped and the first substrate 20 and the second substrate 30 are attached to form the liquid crystal layer 40 between the first substrate 20 and the second substrate 30.
In the present embodiment, although the first substrate 20 is not irradiated with ultraviolet light, since the first substrate 20 has the slit 2021 thereon, the electric field force provided by the first electrode 202 at the slit 2021 defines the rotation direction of the liquid crystal molecules 401. The liquid crystal molecules 401 are arranged according to the direction of the slit 2021, and no obvious disorder phenomenon exists on the whole, and the liquid crystal molecules 401 on the second substrate 30 side are arranged under the action of the alignment force i, so that the effect of weakening the dark line of the pixel under the condition of low cell thickness can be realized.
As can be seen from fig. 14, in the second alignment mode, the alignment force is generated by the exposure of the liquid crystal molecules 401 on the second substrate 30 side, and the transmittance is better and the propagation efficiency is higher when the thickness (Cell Gap) of the liquid crystal layer 40 is 3.2 μm under the dual driving of the electric field force of the first substrate 20.
Fig. 15 is a graph showing thickness and transmittance of a liquid crystal layer using the alignment method of fig. 13. In fig. 15, the abscissa represents the thickness (in μm) of the liquid crystal layer 40. The ordinate represents the luminance value (in units%), the rotational pitch of liquid crystal molecules in Chiral-1 is 9.6 μm, the rotational pitch of liquid crystal molecules in Chiral-2 is 12.8 μm, the rotational pitch of liquid crystal molecules in Chiral-3 is 40 μm, and Nematic liquid crystal molecules in Chiral-1. As can be seen from FIG. 15, the brightness of the nematic liquid crystal molecules is highest at a cell thickness of 3.2 μm; when the thickness of the Chiral-1 box is 3.2 mu m, the brightness is highest; when the thickness of the Chiral-2 box is 3.2 mu m, the brightness is highest; chiral-3 has the highest brightness at a cell thickness of 3.2 μm.
Fourth embodiment
Referring to fig. 3, an embodiment of the invention provides a liquid crystal panel, and the liquid crystal panel is aligned by using the alignment method of the liquid crystal panel provided by the embodiment.
The liquid crystal panel 10 includes a first substrate 20, a second substrate 30, and a liquid crystal layer 40 between the first and second substrates 20 and 30.
The first substrate 20 may be an array substrate (may also be referred to as a TFT substrate). The first substrate 20 is covered with a first electrode 202, and the first electrode 202 is covered with a first alignment film 201. A slit 2021 is provided on the first electrode 202, wherein one or at least two slits 2021 may be provided. The distance between two adjacent slits 2021 ranges from 6.0 μm to 8.0 μm, and the width of the slit 2021 ranges from 3.0 μm to 4.0 μm. By adopting the arrangement of the width of the slit 2021 and the distance between two adjacent slits 2021, the effect of limiting the arrangement of liquid crystal molecules is better, and the alignment force is more uniform.
The second substrate 30 may be a color film substrate. Wherein the second electrode 302 is formed on the second substrate 30, the second alignment film 301 is formed on the second electrode 302, and the second electrode 302 may be a transparent electrode. In the liquid crystal panel 10 provided in this embodiment, by providing at least one slit 2021 on the first electrode 202 of the first substrate 20, the slit 2021 can spatially limit the arrangement of liquid crystal molecules to enhance the alignment force, so as to reduce the exposure dark lines at the division of the pixels to improve the transmittance.
Fifth embodiment
The embodiment of the invention provides a display device which comprises the liquid crystal panel provided by the embodiment.
The structure of the liquid crystal panel has been described in detail in the above embodiments, which are not repeated herein.
The display device provided by the embodiment of the invention can be any product or component with a display function, such as electronic paper, a mobile phone, a tablet computer, a television, a notebook computer, a digital photo frame, a navigator and the like. This embodiment is not limited herein.
The display device provided by the embodiment of the invention comprises a liquid crystal panel which is aligned by an alignment method of the liquid crystal panel, and the slit 2021 can limit the arrangement of liquid crystal molecules from space by arranging at least one slit 2021 on the first electrode 202 of the first substrate 20 so as to enhance the alignment force, thereby reducing the exposure dark line at the division position of the pixel and improving the transmittance.
In the description of the present invention, it is to be understood that the description of the terms "some embodiments" or the like is intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiments or examples is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples described in this specification can be combined and combined by those skilled in the art.
Furthermore, elements, structures, or features illustrated in one drawing or one embodiment of the invention may be combined in any suitable manner with elements, structures, or features illustrated in one or more other drawings or embodiments.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A method for aligning a liquid crystal panel is characterized by comprising the following steps:
forming a first electrode having a slit and a first alignment film covering the first electrode on a first substrate;
forming a second electrode and a second alignment film covering the second electrode on a second substrate;
irradiating the first alignment film or the second alignment film by using ultraviolet light to form alignment force;
and dripping liquid crystal and attaching the first substrate and the second substrate to form a liquid crystal layer between the first substrate and the second substrate.
2. The method according to claim 1, wherein dropping the liquid crystal and attaching the first substrate and the second substrate to form a liquid crystal layer between the first substrate and the second substrate comprises:
dripping liquid crystal on the first alignment film of the first substrate, and attaching the first substrate and the second substrate, wherein the first substrate is an array substrate, and liquid crystal molecules with a chiral layered structure are arranged in the liquid crystal;
the liquid crystal molecules form a liquid crystal layer which rotates layer by layer under the action of the alignment force and the twisting force generated by the viscosity between the liquid crystal molecules.
3. The method according to claim 2, wherein the step of forming the liquid crystal layer to be turned around layer by the liquid crystal molecules under the twisting force generated by the alignment force and the viscosity between the liquid crystal molecules comprises:
the liquid crystal molecules form a liquid crystal layer which obliquely spirals upwards and turns layer by layer under the action of twisting force generated by the alignment force and the viscosity among the liquid crystal molecules;
the liquid crystal molecules in the same layer in the liquid crystal layer are arranged in the same long axis direction, and the liquid crystal molecules in the same layer in the liquid crystal layer rotate for a preset angle relative to the long axes of the liquid crystal molecules in the next layer, so that the long axes of the liquid crystal molecules in the liquid crystal layer are sequentially spirally upward at a preset angle.
4. The method according to claim 3, wherein the direction of the deflection of the liquid crystal molecules is opposite to the direction of the alignment force.
5. The alignment method of claim 3, wherein the liquid crystal molecules have a helical pitch of 9.6 μm to 40 μm.
6. The method according to any one of claims 1 to 5, wherein the thickness of the liquid crystal layer is in a range of 3.2 μm to 4.0 μm.
7. The alignment method of liquid crystal panel according to any of claims 1 to 5, wherein the number of the slits is at least two, the distance between two adjacent slits is in the range of 6.0 μm to 8.0 μm, and the width of the slits is in the range of 3.0 μm to 4.0 μm.
8. The method according to claim 7, wherein the slit has an extension direction parallel to the direction of the alignment force.
9. A liquid crystal panel, characterized in that the alignment method of the liquid crystal panel according to any one of claims 1 to 8 is used for alignment.
10. A display device comprising the liquid crystal panel according to claim 9.
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