CN109669302B - Liquid crystal display panel, liquid crystal display device and optical alignment method - Google Patents
Liquid crystal display panel, liquid crystal display device and optical alignment method Download PDFInfo
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1337—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers
- G02F1/13378—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers by treatment of the surface, e.g. embossing, rubbing or light irradiation
- G02F1/133788—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers by treatment of the surface, e.g. embossing, rubbing or light irradiation by light irradiation, e.g. linearly polarised light photo-polymerisation
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Abstract
The invention provides a liquid crystal display panel, a liquid crystal display device and a photo-alignment method, wherein the liquid crystal display panel comprises: the liquid crystal display panel comprises a first substrate, a second substrate and a liquid crystal molecular layer, wherein the first substrate and the second substrate are arranged oppositely to each other, the liquid crystal molecular layer is clamped between the first substrate and the second substrate, a first alignment layer and a second alignment layer are respectively formed on the inner surfaces of the first substrate and the second substrate, the first alignment layer and the second alignment layer drive a plurality of liquid crystal molecules of the liquid crystal molecular layer to form alignment of a pretilt angle under the irradiation of alignment light with a preset incident angle, and the pretilt angle ranges from 88.9 degrees to 89.5 degrees. Through making first alignment layer and second alignment layer under the alignment light irradiation that has preset incident angle, order about the liquid crystal molecule in the liquid crystal layer and form 88.9 to 89.5 pretilt angles, can effectual improvement transmissivity, promote liquid crystal display panel's contrast, and it is less to the width distribution influence of dark line, apparent promotion display effect and display quality.
Description
Technical Field
The invention relates to the technical field of display, in particular to a liquid crystal display panel, a liquid crystal display device and a photo-alignment method.
Background
A Liquid Crystal Display (LCD) panel, as a flat panel Display, has advantages of low power consumption, small size, and low radiation. The liquid crystal is placed between two pieces of conductive materials, and the electric field drive of two electrodes is utilized to cause the electric field effect of liquid crystal molecules twisted nematic so as to control the projection or shielding of a light source, thereby achieving the purpose of displaying images.
In the liquid crystal display panel, the photo-alignment utilizes ultraviolet irradiation to control the alignment of liquid crystal molecules, and compared with the process of rubbing alignment, the surface pollution of a glass substrate or the scratch to an alignment film can be reduced. Currently, commonly used photo-Alignment methods include UV2A (Ultra violet vertical Alignment) and psva (polymer substrate vertical Alignment), in which UV2A exposes the display panel covered with the Alignment film liquid, thereby making the Alignment film have a specific pretilt angle. The PSVA irradiates a high molecular polymer alignment film by utilizing linear polarized ultraviolet light, so that the high molecular polymer has alignment capability, the subsequent optical characteristics of the panel can be directly influenced by the size of a pretilt angle formed by liquid crystal, and the response time of the panel is too slow when the pretilt angle is too small; when the pretilt angle is too large, the panel contrast is too low.
However, the pre-tilt angle of the alignment film formed by the current alignment method is high, and the light transmittance of the display panel cannot be improved.
Disclosure of Invention
In order to solve at least one of the problems mentioned in the background art, the present invention provides a liquid crystal display panel, a liquid crystal display device and a photo-alignment method, which can make liquid crystal molecules have a lower pretilt angle to improve the transmittance of the liquid crystal display panel and improve the display effect of the display panel.
In order to achieve the above object, a first aspect of the present invention provides a liquid crystal display panel comprising:
the liquid crystal display device comprises a first substrate, a second substrate and a liquid crystal molecular layer, wherein the first substrate and the second substrate are arranged opposite to each other, and the liquid crystal molecular layer is clamped between the first substrate and the second substrate;
the first alignment layer and the second alignment layer are respectively formed on the inner surfaces of the first substrate and the second substrate, and under the irradiation of alignment light with a preset incident angle, the first alignment layer and the second alignment layer drive the liquid crystal molecules of the liquid crystal molecule layer to form alignment of a pretilt angle, wherein the pretilt angle ranges from 88.9 degrees to 89.5 degrees.
In a specific embodiment of the invention, the pretilt is greater than or equal to 89.0 °.
In an embodiment of the present invention, the preset incident angle of the alignment light is in a range of 0 ° to 60 °, and the preset incident angle of the alignment light is an included angle between an incident direction of the alignment light and a normal direction of the first alignment layer or the second alignment layer.
In a specific embodiment of the present invention, the preset incident angle of the alignment light is less than or equal to 40 °.
In a specific embodiment of the present invention, the first alignment layer and the second alignment layer each include a first film layer and a second film layer stacked on each other;
the first film layers of the first alignment layer and the second alignment layer are respectively covered on the inner surfaces of the first substrate and the second substrate, and the first film layers are used for connecting the second film layers with the first substrate and the second substrate.
In a specific embodiment of the present invention, the first substrate is an array substrate, and the second substrate is a color filter substrate.
In an embodiment of the present invention, a first polarizer and a second polarizer are further disposed on the first substrate and the second substrate, respectively, and transmission axes of the first polarizer and the second polarizer are perpendicular to each other.
In a specific embodiment of the present invention, the first alignment layer and the second alignment layer are both polyimide film layers.
A second aspect of the invention provides a liquid crystal display device, which includes the liquid crystal display panel.
A third aspect of the present invention provides a photo-alignment method, comprising:
providing a first substrate and a second substrate disposed to the cassette;
forming a liquid crystal molecular layer between the first substrate and the second substrate;
forming a first alignment layer and a second alignment layer on the inner surfaces of the first substrate and the second substrate, respectively, wherein the first alignment layer and the second alignment layer drive the liquid crystal molecules of the liquid crystal molecule layer to form alignment of a pretilt angle under alignment light irradiation with a preset incident angle, and the pretilt angle ranges from 88.9 degrees to 89.5 degrees.
According to the liquid crystal display panel, the liquid crystal display device and the optical alignment method, the first alignment layer and the second alignment layer drive liquid crystal molecules in the liquid crystal layer to form the pre-tilt angle under alignment light irradiation with the preset incident angle, the pre-tilt angle ranges from 88.9 degrees to 89.5 degrees, the transmittance of the liquid crystal molecules can be effectively improved, the contrast of the liquid crystal display panel is improved, the influence on the width distribution of dark stripes is small, and the display effect and the display quality of the display panel can be remarkably 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 structural diagram of a liquid crystal display panel according to an embodiment of the invention;
fig. 2a is a graph illustrating a relationship between a pretilt angle and a transmittance of an alignment layer of an lcd panel according to an embodiment of the present invention;
FIG. 2b is a diagram illustrating a relationship between a pretilt angle formed by an alignment layer of an LCD panel and a contrast ratio of the LCD panel according to an embodiment of the present invention;
FIG. 3 is a diagram illustrating a relationship between a pretilt angle of an LCD panel and a contrast ratio of the LCD panel according to an embodiment of the present invention;
FIG. 4 is a diagram illustrating a relationship between pre-tilt angles and dark fringe distribution positions in an LCD panel according to an embodiment of the present invention;
fig. 5 is a schematic diagram illustrating a liquid crystal display panel according to an embodiment of the invention driving liquid crystal molecules to form a pre-tilt angle in different alignment modes;
fig. 6 is a schematic structural diagram of an alignment layer of a liquid crystal display panel according to an embodiment of the invention;
fig. 7 is a schematic flow chart of a photo-alignment method according to a third embodiment of the present invention.
Description of reference numerals:
100-a liquid crystal display panel;
10 — a first substrate;
20 — a second substrate;
30-a layer of liquid crystal molecules;
31-liquid crystal molecules;
40 — a first alignment layer;
50 — a second alignment layer;
60-a first film layer;
70-a second film layer;
l1 — direction of normal to the second film layer;
l2 — direction of incidence of alignment light.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be described in more detail below with reference to the accompanying drawings in the preferred embodiments of the present invention. In the drawings, the same or similar reference numerals denote the same or similar components or components having the same or similar functions throughout. The described embodiments are only some, but not all embodiments of the invention. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention. 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. Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
In the description of the present invention, it should be noted that unless otherwise specifically stated or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning a fixed connection, an indirect connection through intervening media, a connection between two elements, or an interaction between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Example one
Fig. 1 is a schematic structural diagram of a liquid crystal display panel according to a first embodiment of the present invention, fig. 2a is a graph illustrating a relationship between a pretilt angle formed by an alignment layer of the liquid crystal display panel according to the first embodiment of the present invention and a transmittance, FIG. 2b is a graph showing the relationship between the pretilt angle formed by the alignment layer of another LCD panel and the contrast ratio of the LCD panel according to an embodiment of the present invention, FIG. 3 is a diagram illustrating the relationship between the pretilt angle of the LCD panel and the contrast ratio of the LCD panel according to one embodiment of the present invention, FIG. 4 is a diagram illustrating the relationship between the pre-tilt angle and the dark fringe distribution position in an LCD panel according to an embodiment of the present invention, FIG. 5 is a schematic diagram of an embodiment of a liquid crystal display panel driving liquid crystal molecules to form a pre-tilt angle in different alignment modes, fig. 6 is a schematic structural diagram of an alignment layer of a liquid crystal display panel according to an embodiment of the invention.
The inventor of the present invention found in the actual research process that, in the current liquid crystal display panel, during the preparation process, the alignment of the liquid crystal molecules is controlled by ultraviolet irradiation during the optical alignment process, and the formed alignment film enables the liquid crystal molecules to have a specific pretilt angle.
Based on the above findings and the existing technical problems, the embodiments of the present invention provide the following solutions:
referring to fig. 1 to 6, an embodiment of the invention provides a liquid crystal display panel 100, including:
a first substrate 10 and a second substrate 20 provided to the cell, and a liquid crystal molecule layer 30 interposed between the first substrate 10 and the second substrate 20.
The first alignment layer 40 and the second alignment layer 50 are formed on the inner surfaces of the first substrate 10 and the second substrate 20, respectively, and the first alignment layer 40 and the second alignment layer 50 can drive the plurality of liquid crystal molecules 31 of the liquid crystal molecule layer 30 to form a pre-tilt angle alignment under the irradiation of alignment light with a preset incident angle, where the pre-tilt angle is in a range from 88.9 ° to 89.5 °. In the present embodiment, the inner surfaces of the first substrate 10 and the second substrate 20 refer to the sides of the first substrate 10 and the second substrate 20 facing the liquid crystal molecule layer 30, and in order to further improve the display effect of the display panel, when adjusting the pretilt angle of the liquid crystal molecules, it is necessary to consider the influence of the change of the pretilt angle on the transmittance, the display contrast, and the distribution position of the dark stripes, so as to effectively improve the display quality. In the embodiment, the liquid crystal molecules 31 are aligned with a pretilt angle of 88.9 ° to 89.5 °, so that the formed display panel has better transmittance and contrast, and has less influence on the dark fringe width distribution, thereby having better display effect. Specifically, in the present embodiment, the influence of the numerical value of the pretilt angle on the transmittance, the display contrast, and the distribution position of dark stripes in the display area is studied, wherein the influence of the pretilt angles of different degrees on the light transmittance of the liquid crystal molecules is shown in fig. 2a and 2b, and as can be seen from fig. 2a and 2b, in the two alignment agents AL418NK and PPA-2108-R1, the transmittance thereof is gradually increased as the pretilt angle of the liquid crystal molecules is increased, but when the transmittance of the liquid crystal molecules is 90 °, the transmittance is the smallest, so that, on the premise of ensuring the transmittance, the liquid crystal molecules can be aligned at the pretilt angle of 88.9 ° to 89.5 °, i.e., the liquid crystal molecules can have a higher transmittance.
In the Alignment mode of Polymer Sustained Alignment (PSA) and the Alignment mode of UV2A, the effect of different pretilt angles on the contrast ratio of the display panel is shown in fig. 3, as can be seen from fig. 3, when the first alignment layer 40 and the second alignment layer 50 drive the liquid crystal molecules in the liquid crystal molecule layer 30 to form the pretilt angle of 85 ° to 90 ° by adjusting the incident angle of the alignment light in the PSA alignment mode and the UV2A alignment mode, as the pretilt angle increases, the contrast ratio is gradually increased, when the pretilt angle is larger than 88.9 degrees, the contrast ratio basically tends to be smooth, that is, when the pretilt angle of the liquid crystal molecules is larger than 88.9 degrees, the liquid crystal display panel has a better contrast ratio, which is helpful for improving the display effect, and in addition, in the UV2A alignment mode, the contrast ratio of the liquid crystal display panel is generally higher than that obtained in the PSA alignment mode.
In the alignment mode of UV2A, the dark fringe distribution positions of the display area are affected by the pretilt angles with different values as shown in fig. 4, and when the formed dark fringe distribution positions are farther from the edge of the pixel electrode, the width of the dark line is increased, so that the aperture ratio is affected, and the display effect of the display panel is reduced, as shown in fig. 4, as the pretilt angle values are increased, the farther the dark fringe distribution positions are from the edge of the pixel electrode (25mm is the edge of the electrode), the greater the effect on the aperture ratio is.
Therefore, in combination with fig. 2a, 2b, fig. 3 and fig. 4, considering the pretilt angle versus transmittance, the display contrast and the distribution position of the formed dark lines, when the liquid crystal molecules in the liquid crystal molecule layer are driven to form the pretilt angle of 88.9 ° to 89.5 °, the obtained display panel has better display quality and display effect, even if the first alignment layer 40 and the second alignment layer 50 are irradiated by the alignment light with the preset incident angle, the plurality of liquid crystal molecules 31 of the liquid crystal molecule layer 30 are driven to form the alignment of the pretilt angle, and the pretilt angle ranges from 88.9 ° to 89.5 °, which can effectively improve the transmittance, improve the display contrast, have less influence on the width distribution of the dark stripes, and can significantly improve the display effect and the display quality of the display panel.
Further, in the present embodiment, the pretilt is greater than or equal to 89.0 °. It should be noted that, in order to improve the display effect of the display panel, while adjusting the pretilt angle of the liquid crystal molecules to adjust the transmittance, the influence of the pretilt angle of the liquid crystal molecules on the dark line distribution, the contrast ratio, and the like should be considered, and in combination with these parameters, based on the above description, when the pretilt angle of the liquid crystal molecules is 89.0 °, the display panel has better transmittance, higher contrast ratio, and smaller dark fringe influence, so that in this embodiment, the pretilt angle is within the range of 88.9 ° to 89.5 °, and may be further limited, and the pretilt angle is greater than or equal to 89.0 °.
Further, in the present embodiment, the preset incident angle of the alignment light is in the range of 0 ° to 60 °, as shown in fig. 5 and 6, the preset incident angle of the alignment light is the angle between the incident direction L2 of the alignment light and the normal direction L1 of the first alignment layer or the second alignment layer, and under the alignment light irradiation of the first alignment layer 40 and the second alignment layer 50 at the preset incident angle between 0 ° and 60 °, the liquid crystal molecules 31 are aligned by the first alignment layer 40 and the second alignment layer 50, and the alignment with the pretilt angle between 88.9 ° and 89.5 ° can be formed.
Further, in the present embodiment, the predetermined incident angle of the alignment light is less than or equal to 40 °, in the present embodiment, table 1 shows the pretilt angle of the liquid crystal molecules under the irradiation of the predetermined incident angles of the different alignment lights, and the pretilt angle formed by the liquid crystal molecules driven by the two alignment agents AL418NK and PPA-2108-R1 is shown in table 1, as the predetermined incident angle increases, the pretilt angle formed by the liquid crystal molecules decreases, and as can be seen from the above discussion, as the pretilt angle decreases, the transmittance and contrast thereof decreases, the dark fringe width thereof increases, which is not favorable for the display effect, therefore, in the present embodiment, the predetermined incident angle of the alignment light is further limited to be less than or equal to 40 °, so that the display panel has a better display effect.
TABLE 1 pretilt angle of liquid crystal molecules irradiated at different preset incident angles of alignment light
In the embodiment, when the predetermined incident angle of the alignment light is 40 °, as shown in fig. 5, the first alignment layer and the second alignment layer formed under different exposure alignment modes can drive the liquid crystal molecules to form an alignment with a pretilt angle of 88.9 ° to 89.5 °.
In this embodiment, the first substrate 10 may be a color filter substrate, and the second substrate 20 may be an array substrate.
In this embodiment, the first substrate 10 and the second substrate 20 may further have a first polarizer and a second polarizer respectively disposed thereon, and the transmission axes of the first polarizer and the second polarizer are perpendicular to each other.
In the present embodiment, the first alignment layer 40 and the second alignment layer 50 each include a first film layer 60 and a second film layer 70 stacked together. As shown in fig. 6, the first film layers 60 of the first and second alignment layers 40 and 50 are respectively coated on the inner surfaces of the first and second substrates 10 and 20. The first film 60 is used to connect the second film 70 to the first substrate 10 and the second substrate 20, respectively, that is, the first alignment layer 40 is connected to the first substrate 10, and the second alignment layer 70 is connected to the second substrate 20. Specifically, in the embodiment, the predetermined incident angle of the alignment light is an included angle between the incident direction L2 of the alignment light and the normal direction L1 of the second film, the first film 60 may be a base layer, the second film 70 may be a photoreaction layer, the base layer mainly functions to connect the photoreaction layer with the first substrate 10 or the second substrate 20, and the photoreaction layer may have an alignment capability under the irradiation of ultraviolet light, so as to drive the liquid crystal molecules to form a pre-tilt angle.
It should be noted that, referring to fig. 1, in the liquid crystal display panel 100 provided in this embodiment, the first substrate 10 may be an array substrate, and the second substrate 20 may be a color film substrate, where the color film substrate may include a transparent substrate, a color film layer and a common electrode, where the color film layer includes black matrices arranged at intervals and a pixel array located between the black matrices, and the pixel array includes a plurality of pixel units.
The array substrate may include a thin-film transistor layer and a pixel electrode. The first substrate 10 and the second substrate 20 are disposed opposite to each other, that is, the surfaces of the two are opposite to each other, so as to form a certain accommodating space therebetween. A liquid crystal molecule layer 30 may be further disposed in the space, the liquid crystal molecule layer 30 includes a plurality of liquid crystal molecules 31 aligned, and the liquid crystal molecules 31 are deflected by an electric field or ultraviolet light.
The first alignment layer 40 and the second alignment layer 50 are respectively disposed on the inner surfaces (i.e., the surfaces near the accommodating space) of the first substrate 10 and the second substrate 20, and in the preparation process of the liquid crystal display panel 100, photo-alignment is required, and the alignment capability of the first alignment layer 40 and the second alignment layer 50 can guide the liquid crystal molecules 31 to deflect. A first polarizer and a second polarizer (not shown) are disposed on outer surfaces (i.e., surfaces on a side away from the accommodating space) of the first substrate 10 and the second substrate 20, respectively.
When the liquid crystal display panel 100 works, the backlight module emits light, and light of the backlight module may first pass through the first polarizer, so as to form polarized light having a first polarization direction, where the first polarization direction of the polarized light is the same as the transmission axis direction of the first polarizer. The polarized light enters the liquid crystal molecule layer 30 through the thin film transistor layer, the pixel electrode and the base layer in sequence.
The liquid crystal molecular layer 30 deflects under the action of an electric field between the common electrode and the pixel electrode, and light is continuously refracted when passing through the liquid crystal molecular layer 30, so that the first polarization direction of the light is changed into a second polarization direction which is the same as the transmission axis direction of the second polarizer, and therefore, the polarized light can be sequentially emitted through the pixel array of the color film substrate and the second polarizer, and color light is formed.
In the present embodiment, the first alignment layer 40 and the second alignment layer 50 may be polyimide film layers. In addition, in this embodiment, the liquid crystal display panel may be a component for displaying in products such as electronic paper, a tablet computer, a liquid crystal display, a liquid crystal television, a digital photo frame, and a mobile phone.
According to the liquid crystal display panel provided by the embodiment of the invention, under the irradiation of the alignment light with the preset incident angle, the first alignment layer 40 and the second alignment layer 50 drive the liquid crystal molecules 31 in the liquid crystal layer 30 to form the pre-tilt angle, and the pre-tilt angle ranges from 88.9 degrees to 89.5 degrees, so that the transmittance of the liquid crystal molecules is effectively improved, the contrast of the liquid crystal display panel is improved, the distribution and the width of dark stripes in a display area are reduced, and the display effect and the display quality of the display panel are remarkably improved.
Example two
On the basis of the first embodiment, the second embodiment of the invention also provides a liquid crystal display device.
Specifically, the lcd device may include the lcd panel 100, the backlight module and the driving and controlling circuit in the first embodiment, wherein the backlight module (not shown in the figure) may include a housing, a backlight lamp, a reflective plate, a light guide plate and a light diffusion plate, which are stacked layer by layer, and can be detached and replaced. When the liquid crystal display device is used, the driving and control circuit controls the background illuminating lamp in the backlight module to emit light, the light is guided into the liquid crystal display panel 100 by the reflecting plate, the light guide plate and the light diffusion plate, and the light sequentially passes through the first polarizer, the thin film transistor layer, the pixel electrode, the first alignment layer 40, the liquid crystal molecular layer 30, the second alignment layer 50, the common electrode, the color film layer and the second polarizer of the liquid crystal display panel 100 to form color light to be emitted out of the liquid crystal display device.
In this embodiment, the display device may further include other components, specifically, refer to a liquid crystal display device in the prior art, which is not described in detail in this embodiment, where in this embodiment, the display device may specifically be any product or component having a display function, such as a liquid crystal display device, electronic paper, a mobile phone, a tablet computer, a television, a notebook computer, a digital photo frame, and a navigator.
Other technical features are the same as those of the first embodiment and can achieve the same technical effects, and are not described in detail herein.
The liquid crystal display device provided by the second embodiment of the invention comprises a liquid crystal display panel, and under the irradiation of alignment light with a preset incident angle, the first alignment layer and the second alignment layer in the liquid crystal display panel enable liquid crystal molecules in a liquid crystal molecule layer to form pre-tilt angle alignment of 88.9-89.5 degrees, so that the transmittance of the liquid crystal molecules is effectively improved, the contrast of the liquid crystal display panel is improved, the distribution and the width of a display area under dark stripes are reduced, the display effect and the display quality of the display panel are improved, and the liquid crystal display device has a good display effect.
EXAMPLE III
Fig. 7 is a schematic flow chart of a photo-alignment method according to a third embodiment of the present invention. Referring to fig. 7, on the basis of the first embodiment, a third embodiment of the present invention further provides a photo-alignment method, which includes the following specific steps:
s1: first and second substrates are provided for the cartridge. And carrying out cell pair processing on the first substrate and the second substrate to form a liquid crystal cell.
The first substrate may be an array substrate, and the array substrate may include a thin film transistor layer and a pixel electrode. The second substrate may be a color film substrate and the color film substrate may include a transparent substrate, a color film layer and a common electrode, wherein the color film layer includes black matrixes arranged at intervals and a pixel array located between the black matrixes, and the pixel array includes a plurality of pixel units.
S2: a liquid crystal molecular layer is formed between the first substrate and the second substrate.
A liquid crystal molecular layer is formed between the first substrate and the second substrate, and the liquid crystal molecular layer comprises a plurality of liquid crystal molecules arranged according to an array.
S3: a first alignment layer and a second alignment layer are formed on inner surfaces of the first substrate and the second substrate, respectively.
The inner surfaces of the first substrate and the second substrate refer to surfaces of the first substrate and the second substrate facing the liquid crystal molecular layer, and the first alignment layer and the second alignment layer may be formed by coating or deposition, respectively.
S4: the first alignment layer and the second alignment layer are irradiated by alignment light with a preset incident angle, so that the plurality of liquid crystal molecules of the liquid crystal molecule layer form alignment with a pretilt angle, and the pretilt angle ranges from 88.9 degrees to 89.5 degrees.
Other technical features are the same as those of the first embodiment and can achieve the same technical effects, and are not described in detail herein.
In the photo-alignment method provided by the third embodiment of the invention, the first alignment layer and the second alignment layer are irradiated by the alignment light with the preset incident angle, so that the liquid crystal molecules in the liquid crystal molecule layer form the pre-tilt angle alignment with the angle range of 88.9 degrees to 89.5 degrees, thereby effectively improving the transmittance of the liquid crystal molecules, improving the contrast of the liquid crystal display panel, reducing the distribution and width of dark fringes in the display area, and remarkably improving the display effect and the display quality of the display panel.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are used merely for convenience of description and for simplicity of description, and do not indicate or imply that the device or element so referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus should not be considered as limiting the present invention.
In the description of the present invention, it is to be understood that the terms "comprises" and "comprising," and any variations thereof, as used herein, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integral to one another; either directly or indirectly through intervening media, may be used in either the internal or the external relationship of the two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations. Furthermore, the terms "first", "second", etc. 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.
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 (7)
1. A liquid crystal display panel, comprising:
the liquid crystal display device comprises a first substrate, a second substrate and a liquid crystal molecular layer, wherein the first substrate and the second substrate are arranged opposite to each other, and the liquid crystal molecular layer is clamped between the first substrate and the second substrate;
a first alignment layer and a second alignment layer are respectively formed on the inner surfaces of the first substrate and the second substrate, the first alignment layer and the second alignment layer drive a plurality of liquid crystal molecules of the liquid crystal molecular layer to form alignment of a pretilt angle under alignment light irradiation with a preset incident angle, the pretilt angle is equal to 89.0 degrees, so that the transmittance of the liquid crystal display panel is greater than 0.3, the contrast is 0.9-1.0, and a dark line of a display area of liquid crystal display is arranged adjacent to the edge of the pixel electrode;
the preset incident angle of the alignment light is equal to 40 degrees.
2. The liquid crystal display panel according to claim 1, wherein the first alignment layer and the second alignment layer each comprise a first film layer and a second film layer stacked;
the first film layers of the first alignment layer and the second alignment layer are respectively covered on the inner surfaces of the first substrate and the second substrate, and the first film layers are used for connecting the second film layers with the first substrate and the second substrate.
3. The liquid crystal display panel according to claim 1 or 2, wherein the first substrate is an array substrate, and the second substrate is a color film substrate.
4. The liquid crystal display panel according to claim 3, wherein the first substrate and the second substrate are further provided with a first polarizer and a second polarizer, respectively, and the transmission axes of the first polarizer and the second polarizer are perpendicular to each other.
5. The liquid crystal display panel of claim 4, wherein the first alignment layer and the second alignment layer are both polyimide film layers.
6. A liquid crystal display device comprising the liquid crystal display panel according to any one of claims 1 to 5.
7. A method of photoalignment, comprising:
providing a first substrate and a second substrate disposed to the cassette;
forming a liquid crystal molecular layer between the first substrate and the second substrate;
forming a first alignment layer and a second alignment layer on the inner surfaces of the first substrate and the second substrate respectively, wherein the first alignment layer and the second alignment layer drive a plurality of liquid crystal molecules of the liquid crystal molecule layer to form alignment of a pretilt angle under alignment light irradiation with a preset incident angle, and the pretilt angle is equal to 89 degrees;
the preset incidence angle of the alignment light is less than or equal to 40 degrees.
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| CN113568200A (en) * | 2021-07-15 | 2021-10-29 | 惠州华星光电显示有限公司 | Dark cluster repairing method and device for curved liquid crystal display panel |
| CN113777837A (en) * | 2021-09-29 | 2021-12-10 | 业成科技（成都）有限公司 | Liquid crystal display panel, preparation method thereof and display screen |
| CN113641027B (en) * | 2021-10-14 | 2022-02-18 | 惠科股份有限公司 | Manufacturing method of liquid crystal panel and display panel |
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