Patent Application
20220291553
The present application claims the benefit of Chinese Patent Application No. 202110277805.0 filed on Mar. 15, 2021, the entire disclosure of which is incorporated herein by reference.
The present disclosure relates to the field of display technologies, especially to a display panel and a display device.
In a large-sized advanced super dimension switch (ADS) TV liquid crystal display panel, the direction of the liquid crystal is parallel to the panel. In the L0 state (dark state), the display panel has a low contrast ratio under a high brightness. Therefore, it is desired to propose a solution enhancing the contrast ratio of the large-sized ADS TV liquid crystal display panel.
As a first aspect of the embodiments of the present disclosure, an embodiment of the present disclosure provides a display panel comprising: a first substrate; a second substrate arranged opposite to the first substrate; a liquid crystal layer between the first substrate and the second substrate; a first alignment layer on a side of the first substrate facing the second substrate; and a second alignment layer on a side of the second substrate facing the first substrate; a rotation angle of an alignment direction of the second alignment layer with respect to an alignment direction of the first alignment layer is greater than 0 degree.
In some implementations, a long axis direction of liquid crystal molecules in the liquid crystal layer is parallel to at least one of a surface of the first substrate and a surface of the second substrate.
In some implementations, a direction in which the alignment direction of the second alignment layer is rotated with respect to the alignment direction of the first alignment layer is an alignment rotation direction; for a rotation angle of 0 degree and an L0 state, a direction in which liquid crystal molecules in the liquid crystal layer in contact with the second alignment layer are twisted with respect to liquid crystal molecules in the liquid crystal layer in contact with the first alignment layer is a liquid crystal twist direction; the alignment rotation direction is opposite to the liquid crystal twist direction.
In some implementations, the rotation angle is a sum of a theoretical compensation angle and a correction angle, for a rotation angle of 0 degree and an L0 state, an angle at which liquid crystal molecules in the liquid crystal layer in contact with the second alignment layer are twisted with respect to liquid crystal molecules in the liquid crystal layer in contact with the first alignment layer is a liquid crystal twist angle, and the theoretical compensation angle is equal to the liquid crystal twist angle.
In some implementations, a value of the correction angle is in a range of 0° to 0.3°.
In some implementations, the value of the correction angle is 0.16°.
In some implementations, the display panel is an advanced super dimension switch liquid crystal display panel.
As a second aspect of embodiments of the present disclosure, an embodiment of the present disclosure provides a display device comprising the display panel according to according to any one of the foregoing embodiments.
The above summary is only for illustrative purposes and is not intended to be limiting in any way. In addition to the exemplary aspects, embodiments and features described above, by referring to the accompanying drawings and the following detailed description, further aspects, embodiments and features of the present disclosure will be easy to appreciate.
In the drawings, unless otherwise specified, the same reference numerals denote the same or similar portions or elements throughout the multiple drawings. The drawings are not necessarily drawn to scale. It should be understood that these drawings only depict some embodiments according to the present disclosure, and should not be regarded as limiting the scope of the present disclosure.
Only some exemplary embodiments are briefly described below. As those skilled in the art can realize, the described embodiments may be modified in various different ways without departing from the spirit or scope of the present disclosure. Therefore, the drawings and description are regarded to be illustrative essentially but not restrictive.
As shown in
As shown in
There are many factors affecting the L0 brightness of the display panel, such as materials, designs, etc., and the product specifications need to be comprehensively considered for product development. In the case that designs and materials are basically unchanged, improving the process for the product is crucial to the enhancement of the contrast ratio.
Therefore, in the context of the present disclosure, the “liquid crystal twist direction” and “liquid crystal twist angle” refer to a twist direction and a twist angle related to the properties of liquid crystal molecules exhibited by the liquid crystal molecules in the technical solution shown in
In the display panel according to an embodiment of the present disclosure, the rotation angle β of the second alignment direction 62 with respect to the first alignment direction 61 is greater than 0°, that is, the second alignment direction 62 is not parallel to the first alignment direction 61. Therefore, in the L0 state, the second alignment direction 62 can adjust the liquid crystal twist angle (i.e., reducing the twist angle of the liquid crystal molecules close to the second alignment layer 22 with respect to the liquid crystal molecules close to the first alignment layer 12). As a result, light leakage of the display panel in the L0 state is reduced, the brightness of the display panel in the L0 state is decreased, and the contrast ratio of the display panel is enhanced.
In an embodiment, as shown in
In an embodiment, as shown in
In an embodiment, one of the first substrate 11 and the second substrate 21 may be an array substrate, and the other may be a color filter substrate. The material of the first alignment layer and the second alignment layer may include polyimide (PI).
As shown in
In the expression of the rotation angle β, “−” indicates that the direction of β is opposite to the direction of θ, that is, the alignment rotation direction (the direction in which the alignment direction of the second alignment layer 22 is rotated with respect to the alignment direction of the first alignment layer 12) is opposite to the liquid crystal twist direction (the direction in which the liquid crystal molecules close to the second alignment layer 22 are twisted with respect to the liquid crystal molecules close to the first alignment layer 12).
Exemplarily, in the case that the alignment direction 62 of the second alignment layer 22 is parallel to the alignment direction 61 of the first alignment layer 12, in the L0 state (dark state) of the display panel, the angle at which the liquid crystal molecules close to the second alignment layer 22 (i.e., liquid crystal molecules in contact with the second alignment layer 22) are twisted with respect to the liquid crystal molecules close to the first alignment layer 12 (i.e., liquid crystal molecules in contact with the first alignment layer 12) is a liquid crystal twist angle. In this case, the theoretical compensation angle is equal to the liquid crystal twist angle.
It can be understood that, in practical production, a product sample may be first fabricated, the alignment direction of the second alignment layer is set to be parallel to the alignment direction of the first alignment layer, and the liquid crystal twist angle is obtained by testing in the L0 state of the display panel. The theoretical compensation angle is obtained based on the liquid crystal twist angle, and the specific value and direction of the rotation angle β are further calculated. In subsequent production, the alignment direction of the second alignment layer is set according to the specific value and direction of the rotation angle β.
In an embodiment, the correction angle λ is in the range of 0° to 0.3°. The value of the correction angle λ may be any value greater than 0° and less than 0.3°. Optionally, the value of the correction angle λ is 0.16°.
Table 1 is a table of the relations between the contrast ratio enhancement rate of the display panel, the theoretical compensation angle and the rotation angle.
Based on the inventive concept of the foregoing embodiments, an embodiment of the present disclosure further provides a display device comprising the display panel according to the foregoing embodiments. The display device may be any product or component with a display function, such as a mobile phone, a tablet computer, a television, a monitor, a notebook computer, a digital photo frame, a navigator, and so on.
According to the technical solutions of embodiments of the present disclosure, the rotation angle β of the second alignment direction with respect to the first alignment direction is greater than 0°, that is, the second alignment direction 62 is not parallel to the first alignment direction 61. Therefore, in the L0 state, the second alignment direction 62 can adjust the liquid crystal twist angle (i.e., reducing the twist angle of the liquid crystal molecules close to the second alignment layer with respect to the liquid crystal molecules close to the first alignment layer). As a result, light leakage of the display panel in the L0 state is reduced, the brightness of the display panel in the L0 state is decreased, and the contrast ratio of the display panel is enhanced.
In the description of this specification, it should be understood that the orientations or positional relations indicated by the terms such as “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “upper”, “lower”, “front”, “rear”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inner”, “outer”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, and the like are based on the orientations or positional relations shown in the drawings, which are only for the convenience of describing the present disclosure and simplifying the description, and do not indicate or imply an indicated device or element must have a specific orientation, or be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation to the present disclosure.
In addition, the terms “first” and “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. Thus, the features defined with “first” and “second” may explicitly or implicitly include one or more of these features. In the description of the present disclosure, “plurality” means two or more, unless specifically defined otherwise.
In the present disclosure, unless expressly specified and defined otherwise, the terms such as “installation”, “connected”, “connection”, “fixation”, etc. should be understood broadly, for example, they can be fixed connection, detachable connection or integral connection; they can be mechanical connection, electrical connection or communication; they can be direct connection or indirect connection via an intermediate medium, or communication between two elements or interaction between two elements. Those ordinarily skilled in the art may understand the specific meanings of the above terms in the present disclosure based on specific situations.
In the present disclosure, unless expressly specified and defined otherwise, the first feature being “on” or “under” the second feature may include the first feature being in direct contact with the second feature, and may also include the first feature and the second feature being not in direct contact but in contact with each other via another feature therebetween. Moreover, the first feature being “on”, “above” and “over” includes the first feature being directly above and diagonally above the second feature, or it simply means that the level height of the first feature is larger than that of the second feature. The first feature being “under”, “below” and “beneath” the second feature includes the first feature being directly below and diagonally below the second feature, or it simply means that the level height of the first feature is smaller than that of the second feature.
The above disclosure provides many different embodiments or examples for implementing different structures of the present disclosure. In order to simplify the present disclosure, components and settings of specific examples are described above. Of course, they are only examples, and are not intended to limit the present disclosure. In addition, the present disclosure may repeat reference numerals and/or reference letters in different examples, and this repetition is for the purpose of simplification and clarity and does not itself indicate the relationships between the various embodiments and/or settings discussed.
What have been described are only specific embodiments of the present disclosure, but the protection scope of the present disclosure is not so limited. Any variations or substitutions that can be easily conceived by a skilled person familiar with this technical field shall be encompassed within the protection scope of the present disclosure. Thus, the protection scope of the present disclosure shall be based on that of the claims.
| Number | Date | Country | Kind |
|---|---|---|---|
| 202110277805.0 | Mar 2021 | CN | national |
