The present disclosure relates to the field of display technologies, and particularly to a liquid crystal display panel and a curved display device.
Liquid crystal display (LCD) devices, with their advantages such as a thin body, power efficiency, radiation-free, etc., have been widely used and have a dominant position in the field of flat panel displays.
In recent years, with development of LCD technology, major manufacturers have successively introduced curved LCD devices. Ordinary LCD devices have been relatively unsatisfactory in terms of edges of screens, and they have problems such as color shifts, while a curved design of the curved LCD devices provides a wide, panoramic imaging effect. Regardless of whether it is at a center of a screen or around its edges, it can bring good visual enjoyment, and it also reduces distortion of off-axis viewing when viewing at close range. Therefore, on the whole, curved LCD devices can provide the best viewing effect from the center of the screen to the edges of the screen. In addition, curved LCD devices will increase viewing distance of users to achieve a better viewing experience. Therefore, compared to ordinary LCD devices, curved LCD devices have great advantages.
A method of manufacturing a curved LCD device in prior art is to directly apply stress to a flat LCD panel to make the LCD panel present in a curved state. During bending of the LCD panel, due to difference in curvatures of two substrates of the LCD panel, relative positions of the two substrates perpendicular to a light-emitting surface will be displaced, causing misalignment of optical axes of anchored liquid crystal molecules to become larger, and even phenomenon of “fight” of the liquid crystal molecules occurs, which then produces dark clusters, thereby seriously affecting quality of the panels.
Therefore, the prior art has shortcomings which need to be solved urgently.
The present disclosure provides an LCD panel and a curved display device to relieve undesirable phenomena such as dark clusters caused by the misalignment of the optical axes of liquid crystal molecules after the LCD panel is bent in the prior art.
To solve the above problems, technical solutions provided by the present disclosure are as follows:
The present disclosure provides an LCD panel, including:
In the LCD panel of the present disclosure, a difference between the first pretilt angle and the second pretilt angle ranges from 0.5° to 30°; alternatively, the difference between the first pretilt angle and the second pretilt angle ranges from 0.5° to 2° .
In the LCD panel of the present disclosure, one of the first pretilt angle or the second pretilt angle ranges from 60° to 89.5°, and the other one of the first pretilt angle or the second pretilt angle is equal to 90°.
In the LCD panel of the present disclosure, the LCD panel further includes a first alignment film and a second alignment film, the first alignment film is disposed on a side surface of the first substrate adjacent to the first liquid crystal layer, and the second alignment film is disposed on a side surface of the second substrate adjacent to the second liquid crystal layer and is disposed opposite to the first alignment film.
In the LCD panel of the present disclosure, one of the first alignment film or the second alignment film is defined with grooves on a side surface adjacent to the liquid crystal layer, and the pretilt angle of the liquid crystal molecules in one of the first liquid crystal layer or the second liquid crystal layer closer to the grooves is greater than the pretilt angle of the liquid crystal molecules in the other one of the first liquid crystal layer or the second liquid crystal layer.
In the LCD panel of the present disclosure, a depth of each of the grooves is less than or equal to a thickness of the first alignment film or a thickness of the second alignment film.
In the LCD panel of the present disclosure, one of the first substrate or the second substrate is provided with pixel electrodes, an extending direction of each of the grooves is same as an extending direction of each of the pixel electrodes.
In the LCD panel of the present disclosure, one of the first substrate or the second substrate is provided with protrusions on a side surface adjacent to the liquid crystal layer, and the pretilt angle of the liquid crystal molecules in one of the first liquid crystal layer or the second liquid crystal layer closer to the protrusions is greater than the pretilt angle of the liquid crystal molecules in the other one of the first liquid crystal layer or the second liquid crystal layer.
In the LCD panel of the present disclosure, each of the protrusions extends in a strip shape, and a shape of a cross section of each of the protrusions perpendicular to an extending direction of the protrusions is one of a trapezoid, a triangle, or a semicircle.
In the LCD panel of the present disclosure, one of the first substrate or the second substrate is provided with a pixel electrode, the extending direction of the protrusions is same as an extending direction of the pixel electrode.
The present disclosure further provides a curved display device, including a backlight source and an LCD panel, the backlight source connected to the LCD panel to provide backlight for the LCD panel; and
In the curved display device of the present disclosure, a difference between the first pretilt angle and the second pretilt angle ranges from 0.5° to 30°; alternatively, the difference between the first pretilt angle and the second pretilt angle ranges from 0.5° to 2°.
In the curved display device of the present disclosure, one of the first pretilt angle or the second pretilt angle ranges from 60° to 89.5°, and the other one of the first pretilt angle or the second pretilt angle is equal to 90°.
In the curved display device of the present disclosure, the LCD panel further includes a first alignment film and a second alignment film, the first alignment film is disposed on a side surface of the first substrate adjacent to the first liquid crystal layer, and the second alignment film is disposed on a side surface of the second substrate adjacent to the second liquid crystal layer and is disposed opposite to the first alignment film.
In the curved display device of the present disclosure, one of the first alignment film or the second alignment film is defined with grooves on a side surface adjacent to the liquid crystal layer, and the pretilt angle of the liquid crystal molecules in one of the first liquid crystal layer or the second liquid crystal layer closer to the grooves is greater than the pretilt angle of the liquid crystal molecules in the other one of the first liquid crystal layer or the second liquid crystal layer.
In the curved display device of the present disclosure, a depth of each of the grooves is less than or equal to a thickness of the first alignment film or a thickness of the second alignment film.
In the curved display device of the present disclosure, one of the first substrate or the second substrate is provided with pixel electrodes, an extending direction of each of the grooves is same as an extending direction of each of the pixel electrodes.
In the curved display device of the present disclosure, one of the first substrate or the second substrate is provided with protrusions on a side surface adjacent to the liquid crystal layer, and the pretilt angle of the liquid crystal molecules in one of the first liquid crystal layer or the second liquid crystal layer closer to the protrusions is greater than the pretilt angle of the liquid crystal molecules in the other one of the first liquid crystal layer or the second liquid crystal layer.
In the curved display device of the present disclosure, each of the protrusions extends in a strip shape, and a shape of a cross section of each of the protrusions perpendicular to an extending direction of the protrusions is one of a trapezoid, a triangle, or a semicircle.
In the curved display device of the present disclosure, one of the first substrate or the second substrate is provided with a pixel electrode, the extending direction of the protrusions is same as an extending direction of the pixel electrode.
Beneficial effects of the present disclosure are: in the LCD panel and the curved display device provided by the present disclosure, the pretilt angles of the liquid crystal molecules in the first liquid crystal layer close to the first substrate and the second liquid crystal layer close to the second substrate are designed, and there is a difference between the two pretilt angles, so after the LCD panel is bent, the optical axes of the liquid crystal molecules will not produce undesirable phenomena such as dark clusters due to misalignment.
Following describes specific implementations of the present disclosure in detail with reference to accompanying drawings, which will make the technical solutions and other beneficial effects of the present disclosure obvious.
The technical solutions in the embodiments of the present disclosure will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present disclosure. Obviously, the described embodiments are only a part of the embodiments of the present disclosure, but not all the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by those skilled in the art without creative work fall into protection scope of the present disclosure.
In the description of the present disclosure, it should be understood that the terms “longitudinal”, “lateral”, “length”, “width”, “upper”, “lower”, “front”, “rear”, “left” “,” “right”, “vertical”, “horizontal”, etc. indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, and are only for convenience of describing the present disclosure and simplifying the description, rather than indicating or implying the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present disclosure. Additionally, the terms “first”, “second” are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Therefore, the features defined with “first” and “second” may explicitly or implicitly include one or more of the features. In the description of the present disclosure, “plurality” means two or more than two, unless specifically defined otherwise.
The present disclosure may repeat reference numbers and/or reference letters in different examples, and this repetition is for a purpose of simplification and clarity, and does not indicate the relationship between the various embodiments and/or settings discussed.
As shown in
However, when manufacturing a curved LCD panel, the first substrate 10 and the second substrate 20 are in a curved state, as shown in
In order to solve the technical problem that when manufacturing curved liquid crystal display panels in the prior art, a difference in curvatures of two substrates of the LCD panel would cause relative positions of the two substrates perpendicular to a light-emitting surface to be displaced, causing misalignment of optical axes of anchored liquid crystal molecules to become larger, thereby causing technical problems such as dark clusters, this embodiment of the present disclosure provides a liquid crystal display panel. For details, refer to the following embodiment.
As an embodiment, the first substrate 10 is an array substrate. The first substrate 10 is provided with crisscrossing scan lines and data lines and pixel units defined by intersections of scan lines and data lines. The second substrate 20 is a color filter substrate. The second substrate 20 is provided with grid-shaped black matrixes and an RGB color resist layer located between the black matrixes. The RGB color resist layer corresponds to the pixel units. Wherein, at least one of the first substrate 10 or the second substrate 20 is provided with an alignment film on a side close to the liquid crystal layer 30. As another embodiment, the first substrate 10 is a color filter substrate, and the second substrate 20 is an array substrate.
The liquid crystal layer 30 includes a first liquid crystal layer 301 adjacent to the first substrate 10 and a second liquid crystal layer 302 adjacent to the second substrate 20. Liquid crystal molecules in the first liquid crystal layer 301 have a first pretilt angle α1 relative to the first substrate 10, and liquid crystal molecules in the second liquid crystal layer 20 have a second pretilt angle α2 relative to the second substrate 20, wherein the first pretilt angle α1 and the second pretilt angle α2 are different, i.e., they are not equal.
Furthermore, a difference between the first pretilt angle α1 and the second pretilt angle α2 ranges from 0.5° to 30°.
Furthermore, the difference between the first pretilt angle al and the second pretilt angle α2 ranges from 0.5° to 2°. If the angle difference between the first pretilt angle al and the second pretilt angle α2 is within this range, the phenomenon of “fight” between the liquid crystal molecules in the first liquid crystal layer 301 and the second liquid crystal layer 302 can be avoided.
In order to improve the display effect at large viewing angles, the LCD panel in the prior art usually adopts a multi-domain pixel unit structure, such as a four-domain pixel structure, an eight-domain pixel structure, etc., and there are different liquid crystal alignment areas corresponding to different domains. Specifically,
As shown in
In the present disclosure, the first pretilt angle is the angle between a long axis direction of the liquid crystal molecules in the first liquid crystal layer 301 and a plane where the first substrate 10 is located, and the second pretilt angle is the angle between a long axis direction of the liquid crystal molecules in the second liquid crystal layer 302 and a plane where the second substrate 20 is located.
As shown in
In the prior art, pretilt angles of liquid crystal layers in the LCD panel can be differentiated in the following ways: The first is to form different types of alignment films on the first substrate and the second substrate to generate different pretilt angles, but liquid needs to be changed when preparing the alignment films, which would greatly compromise production capacity. The second is to coat an alignment film on one side of the substrate and not to coat the other side with alignment film. Different pretilt angles can also be formed on both sides; however, this method has poor reliability and high material costs. In the present disclosure, grooves or protrusions are formed on a single-sided substrate to create a difference in pretilt angles of the liquid crystal layer, thereby relieving dark clusters of the curved surface.
Specifically, as shown in
In this embodiment, the first alignment film 40 and the second alignment film 50 are made of a same material, and the material may be, but is not limited to, a polyimide material.
As shown in
Furthermore, a difference between the pretilt angle of the liquid crystal molecules in the first liquid crystal layer 301 and the pretilt angle of the liquid crystal molecules in the second liquid crystal layer 302 ranges from 0.5° to 30°.
When the LCD panel in
In an embodiment, a depth of the grooves 100 may be less than a thickness of the first alignment film 40.
In another embodiment, the depth of the grooves 100 may be set equal to the thickness of the first alignment film 40, i.e., the grooves 100 divide the first alignment film 40 into a plurality of stripes, and each of the grooves 100 is formed between two adjacent strip-shaped alignment films.
In a process of preparing the LCD panel, after the first alignment film 40 is formed on the first substrate 10, the first alignment film 40 is cured, and after curing the first alignment film 40, a rubbing cloth is used to perform a rubbing process on a surface of the first alignment film 40 to form grooves 100 on the surface of the first alignment film 40. A second alignment film 50 is prepared on a side surface of the second substrate 20 close to the first substrate 10, a sealant is prepared on the side of the second substrate 20 close to the first substrate 10, and then, a liquid crystal material is prepared on the first alignment film 40. Then, the first substrate 10 and the second substrate 20 are bonded together, and the sealant is cured to form the LCD panel. The LCD panel is sent into an ultraviolet light cavity, a voltage is applied first, and then ultraviolet light is irradiated to align the liquid crystal molecules in the first liquid crystal layer 301 and the second liquid crystal layer 302 to form the first pretilt angle and the second pretilt angle respectively. Finally, the LCD panel is sent into an unpowered ultraviolet light cavity to be irradiated, so that the reactive monomers in the alignment films are completely reacted, and an entire manufacturing process of the LCD panel is completed.
It can be understood that in another embodiment, grooves 100 may be provided on a side surface of the second alignment film 50 close to the second liquid crystal layer 302. The pretilt angle of the liquid crystal molecules in the second liquid crystal layer 302 is greater than the pretilt angle of the liquid crystal molecules in the first liquid crystal layer 301.
Structures and formation of the grooves 100 provided on the second alignment film 50 are the same as structures and formation of the grooves 100 provided on the first alignment film 40. Please refer to the above-mentioned description, which will not be repeated herein.
As shown in
Wherein, since the grooves 100 are defined on the surface of the first alignment film 40, the first pretilt angle of the first liquid crystal layer 301 is greater than the second pretilt angle of the second liquid crystal layer 302, thereby realizing differentiation of pretilt angles of the liquid crystal layer in the LCD panel. In this embodiment, since materials of the first alignment film 40 and the second alignment film 50 are same, the liquid crystal display panel of the embodiment takes up less capacity and has a lower cost.
As shown in
In this embodiment, the first alignment film 40 and the second alignment film 50 are made of a same material, which may be, but is not limited to, a polyimide material.
In this embodiment, the protrusions 200 are provided on the second substrate 20. Specifically, in the process of preparing the LCD panel, a process of vapor deposition of convex patterns is added after the black matrixes and RGB color resist layer are prepared on the second substrate 20 and before the electrode layer is evaporated onto the second substrate 20. Then, patterning is performed to form a plurality of protrusions 200 on the second substrate 20. Then, an electrode layer is evaporated onto the second substrate 20, and the electrode layer is patterned to form a plurality of electrodes. The electrodes may be pixel electrodes or common electrodes. Each of the protrusions 200 extends in a strip shape, and a shape of a cross section of each of the protrusions 200 perpendicular to an extending direction of the protrusions 200 is, but is not limited to, one of a trapezoid, a triangle, or a semicircle.
The first alignment film 40 and the second alignment film 50 are respectively prepared on the first substrate 10 and the second substrate 20 and the first alignment film 40 and the second alignment film 50 are cured. A sealant is prepared on the side of the second substrate 20 close to the first substrate 10, and then, a liquid crystal material is prepared on the first alignment film 40. The first substrate 10 and the second substrate 20 are bonded together, and the sealant is cured to form an LCD panel. The LCD panel is sent into an ultraviolet light cavity, wherein a voltage is applied first, and then ultraviolet light is irradiated to align the liquid crystal molecules in the first liquid crystal layer 301 and the second liquid crystal layer 302 to form the first pretilt angle and the second pretilt angle respectively. Finally, the LCD panel is sent into an unpowered ultraviolet light cavity to be irradiated, so that the reactive monomers in the alignment films are completely reacted, and an entire manufacturing process of the LCD panel is completed. As shown in
Since the protrusions 200 are provided on a side of the second substrate 20, a trench-like structure is formed between two adjacent protrusions 200, thereby realizing differentiation of the pretilt angles of the liquid crystal layer in the LCD panel. In this embodiment, since the materials of the first alignment film 40 and the second alignment film 50 are same, the liquid crystal display panel of this embodiment takes up less capacity and has a lower cost.
In another embodiment, the first substrate 10 is provided with the protrusions 200, wherein, a structure and a formation method of the protrusions 200 provided on the first substrate 10 are same as a structure and a formation method of the protrusions 200 provided on the second substrate 20. Please refer to the above-mentioned description, which will not be repeated herein.
The liquid crystal display panel of the present disclosure may be, but is not limited to, a vertical alignment-type (VA) liquid crystal display panel.
The present disclosure further provides a curved display device, which includes a backlight source and the liquid crystal display panel in any of the above-mentioned embodiments, and the backlight source is connected to the liquid crystal display panel to provide backlight to the liquid crystal display panel.
In the liquid crystal display panel and the curved display device provided by the present disclosure, the pretilt angle of the liquid crystal molecules in the first liquid crystal layer close to the first substrate and the pretilt angle of the liquid crystal molecules in the second liquid crystal layer close to the second substrate are designed to be different, so that after the liquid crystal display panel is bent, the optical axes of the liquid crystal molecules would not have problems such as dark clusters due to misalignment.
In addition, the LCD panel and the curved display device provided by the present disclosure realize differentiation of the pretilt angle of the liquid crystal molecules in the first liquid crystal layer close to the first substrate and the pretilt angle of the liquid crystal molecules in the second liquid crystal layer close to the second substrate by forming grooves or protrusions on the single-sided substrate of the LCD panel. The process is simple and the cost is low.
In summary, although the present disclosure has been disclosed as above in preferred embodiments, the above-mentioned preferred embodiments are not intended to limit the present disclosure. Those of ordinary skills in the art, without departing from the spirit and scope of the present disclosure, various changes and modifications can be made, so the protection scope of the present disclosure is subject to the scope defined by the claims.
Number | Date | Country | Kind |
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202011604649.6 | Dec 2020 | CN | national |
Filing Document | Filing Date | Country | Kind |
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PCT/CN2020/142442 | 12/31/2020 | WO |