CN111338130B

CN111338130B - Display panel

Info

Publication number: CN111338130B
Application number: CN202010283540.0A
Authority: CN
Inventors: 邵源; 陈孝贤; 闫春秋
Original assignee: TCL Huaxing Photoelectric Technology Co Ltd
Current assignee: TCL Huaxing Photoelectric Technology Co Ltd
Priority date: 2020-04-13
Filing date: 2020-04-13
Publication date: 2023-03-17
Anticipated expiration: 2040-04-13
Also published as: CN111338130A

Abstract

The application discloses display panel, display panel includes: a first substrate, a second substrate and a liquid crystal layer; a spacing column is arranged between the first substrate and the second substrate, the spacing column is divided into a main spacing column and a sub-spacing column, the main spacing column is divided into a first section of main spacing column and a second section of main spacing column, one side of the first section of main spacing column is arranged on one side of the first substrate, a first groove is formed around the lower end face of the first section of main spacing column, and a convex part is formed in the middle of the first groove; the first groove at the lower end of the first section of main spacing column surrounds the upper end surface of the second section of main spacing column and is matched with the second section of main spacing column; has the advantages that: the structure of space post is different from general space post structure among the display panel for display panel is when receiving the exogenic action, and the convex part can exert a reaction force to main space post, and it is thick to readjust the liquid crystal cell, eliminates Mura, and then makes display panel can normally show.

Description

Display panel

Technical Field

The application relates to the technical field of communication, especially relates to the display field, concretely relates to display panel.

Background

In a conventional Liquid Crystal Display (LCD), a column-shaped spacer (PS) is generally disposed to support an upper substrate and a lower substrate, so as to ensure uniformity of a cell thickness of the LCD. In practical application, ring-shaped or horizontal black-and-white banded Mura is often found in the process of carrying out oscillation test or transportation on a display panel, and further detection finds that spacing columns corresponding to Mura regions are sunken to different degrees, namely the height of the spacing columns in the Mura regions is lower than that of a normal region, so that the box thickness (cell gap) is abnormal to form the Mura, and the reason is that local spacing columns are excessively stressed due to the problems of mechanisms and design in the process of transportation or test, the compression time is longer, the spacing columns cannot be restored to the original state after external force is removed, and the quality of the display panel is influenced; if the spacer column material is set too hard to cope with shocks in transport or testing, the low temperature bubbles of the whole panel in the low temperature state perform poorly.

Therefore, in the existing display panel technology, when the spacer pillars in the display panel are under the action of external force, the spacer pillars are sunken to different degrees, so that Mura appears on the display panel and the display effect of the display panel is affected, and improvement is urgently needed.

Disclosure of Invention

The embodiment of the application provides a display panel for when the spacer that solves in the display panel that exists among the prior art receives the exogenic action, the different degree sunken appears in the spacer, makes display panel Mura appear, influences display panel's display effect's problem.

The embodiment of the present application provides a display panel, display panel includes: a first substrate, a second substrate and a liquid crystal layer;

a spacing column is arranged between the first substrate and the second substrate, the spacing column is divided into a main spacing column and a sub spacing column, the main spacing column is divided into a first section of main spacing column and a second section of main spacing column, one side of the first section of main spacing column is arranged on one side of the first substrate, first grooves are formed in the periphery of the lower end face of the first section of main spacing column, and a convex portion is formed in the middle of each first groove;

the first groove at the lower end of the first section of main spacing column surrounds the upper end face of the second section of main spacing column and is matched with the second section of main spacing column.

In some embodiments provided herein, an inner diameter of the first groove is larger than an outer diameter of the upper end face of the second section of main spacer, that is, a gap exists between an inner wall of the first groove and an outer wall of the upper end face of the second section of main spacer.

In some embodiments provided by the present application, the height of the convex portion is smaller than the height of the first groove, that is, the highest point of the convex portion is lower than the edge around the first groove.

In some embodiments provided herein, the upper end surface of the second section of main spacing post is provided with a second groove, and the second groove is matched with the convex part on the first section of main spacing post.

In some embodiments provided herein, the depth of the second groove is less than the depth of the first groove, and the depth of the second groove is also less than the height of the protrusion.

In some embodiments provided herein, the spacer posts are made of an elastic material.

In some embodiments provided herein, the main spacer is masked with a negative photoresist, and the sub-spacers are masked with a positive photoresist or a negative photoresist.

In some embodiments provided herein, the second section of the main spacer uses two masks, the first section of the main spacer uses three masks, and the light transmittance of each mask is different.

In some embodiments provided herein, the transmittance of the first mask of the second section of the main spacer is 90%, and the transmittance of the second mask of the second section of the main spacer is 100%; the light transmittance of the first light shield of the first section of main spacer is 100%, the light transmittance of the second light shield of the first section of main spacer is 60%, and the light transmittance of the third light shield of the first section of main spacer is 90%.

In some embodiments provided in the present application, the first substrate is a color filter substrate, the second substrate is an array substrate, or the first substrate is an array substrate, and the second substrate is a color filter substrate; and a black matrix is arranged between the spacer and the color film substrate.

Compared with the prior art, the display panel provided by the application has the beneficial effects that:

1. according to the display panel provided by the application, the structure of the spacing column in the display panel is different from a common spacing column structure, the first groove is formed in one side, close to the second section of the main spacing column, of the first section of the main spacing column, and the convex part is arranged in the middle of the first groove, namely, two sides of the lower end face of the first section of the main spacing column are high, and the middle of the first section of the main spacing column is low; the first groove at the lower end of the first section of main spacing column surrounds the upper end face of the second section of main spacing column and is matched with the second section of main spacing column; when the display panel is under the action of external force, the convex part can apply a reaction force to the main spacing column, the thickness of the liquid crystal box is readjusted, mura is eliminated, and the display panel can normally display;

2. furthermore, the second groove is formed in the upper end face of the second section of main spacing column, the second groove is arranged right opposite to the convex portion on the first section of main spacing column and matched with the convex portion, and when the display panel is acted by external force, the convex portion can be better positioned with the second groove, so that the display panel can be quickly restored to deform, and the influence on the display quality of the display panel is reduced.

Drawings

The technical solution and other advantages of the present application will become apparent from the detailed description of the embodiments of the present application with reference to the accompanying drawings.

Fig. 1 is a schematic view of a first structure of a display panel according to an embodiment of the present disclosure.

Fig. 2 is a schematic structural diagram of a second main spacer mask of a display panel according to an embodiment of the present disclosure.

Fig. 3 is a schematic structural diagram of a first segment of main spacer mask of a display panel according to an embodiment of the present disclosure.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It is to be understood that the embodiments described are only a few embodiments of the present application and not all 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 application.

In the description of the present application, 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," "clockwise," "counterclockwise," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present application and for simplicity in description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated in a particular manner, and are not to be construed as limiting the present application. 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, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.

The following disclosure provides many different embodiments or examples for implementing different features of the application. In order to simplify the disclosure of the present application, specific example components and arrangements are described below. Of course, they are merely examples and are not intended to limit the present application. Further, the present application may repeat reference numerals and/or reference letters in the various examples for simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or arrangements discussed. In addition, examples of various specific processes and materials are provided herein, but one of ordinary skill in the art may recognize applications of other processes and/or use of other materials.

In the process of carrying out oscillation test or transportation on the existing display panel, the display panel is easy to have ring-shaped or horizontal black-white banded Mura, and the spacing columns corresponding to Mura regions are sunken to different degrees, namely the height of the spacing columns in the Mura regions is lower than that of normal regions, so that the thickness of a display panel box is abnormal to form Mura. And after the external force is removed, the spacer column cannot be restored to the original state, the quality of the display panel is influenced, and if the material of the spacer column is set to be too hard to deal with the vibration in transportation or test, the low-temperature bubble performance of the whole panel in a low-temperature state is poor. Therefore, the present application discloses a display panel to solve the above problems, and particularly, please refer to fig. 1 to fig. 3.

Referring to fig. 1, a first structural diagram 100 of a display panel provided by the present application is defined as a display area 10 and a non-display area 20.

Further, the display panel includes a first substrate 30, a second substrate 40 and a liquid crystal layer, wherein a spacer, a photoresist layer and a functional layer are disposed between the first substrate 30 and the second substrate 40, the main spacer is disposed in the display region 10, and the sub-spacer is disposed in the non-display region 20; the main spacing pillars are further divided into a first section of main spacing pillars 12 and a second section of main spacing pillars 13, the top of the first section of main spacing pillars 12 supports the bottom surface of the first substrate 30, the bottom of the second section of main spacing pillars 13 is arranged on one side of the photoresist layer, wherein the first substrate 30 and the second substrate 40 can both adopt a glass film layer structure. One side of the first section of main spacing column is arranged on one side of the first substrate, the periphery of the lower end face of the first section of main spacing column is provided with a first groove, and the middle of the first groove is provided with a convex part; the first groove at the lower end of the first section of main spacing column surrounds the upper end face of the second section of main spacing column and is matched with the second section of main spacing column.

Furthermore, the inner diameter of the first groove is larger than the outer diameter of the upper end face of the second section of main spacing column, namely, a gap exists between the inner wall of the first groove and the outer wall of the upper end face of the second section of main spacing column.

Further, the height of the convex part is smaller than that of the first groove, namely, the highest point of the convex part is lower than the periphery of the first groove.

Furthermore, a second groove is formed in the upper end face of the second section of main spacing column and matched with the convex portion on the first section of main spacing column.

Further, the depth of the second groove is smaller than the depth of the first groove, and the depth of the second groove is also smaller than the height of the convex part.

Further, the spacing columns are all made of elastic materials. The main spacing column adopts negative photoresist to perform light masking, and the sub-spacing column adopts positive photoresist or negative photoresist to perform light masking.

Furthermore, the second section of main spacing column adopts two photomasks, the first section of main spacing column adopts three photomasks, and the light transmittance of each photomask is different.

Further, the light transmittance of the first light cover of the second section of the main spacer is 90%, and the light transmittance of the second light cover of the second section of the main spacer is 100%; the light transmittance of the first mask of the first segment of the main spacer is 100%, the light transmittance of the second mask of the first segment of the main spacer is 60%, and the light transmittance of the third mask of the first segment of the main spacer is 90%, referring to fig. 2 and 3.

Further, the first substrate 30 is a color filter substrate, the second substrate 40 is an array substrate, or the first substrate 30 is an array substrate, and the second substrate 40 is a color filter substrate; and black matrixes (11, 21) are arranged between the spacing columns and the color film substrate.

Further, the first functional layer 15 is opposed to the first black matrix 11, and the second functional layer 25 is opposed to the second black matrix 21; the sub-spacing pillars and the main spacing pillars are arranged at corresponding positions between the functional layer and the black matrix.

Further, between adjacent spacers, liquid crystal is filled between the first substrate 30 and the second substrate 40.

Further, in the display region 10, the spacer pillars are the main spacer pillars, the photoresist layer is a first photoresist layer 14, and the functional layer is a first functional layer 15; in the non-display area 20, the spacers are the sub-spacers, the photoresist layer is the second photoresist layer 24, the functional layer is the second functional layer 25, and an encapsulation adhesive layer 50 is further disposed between the first substrate 30 and the second substrate 40 in the non-display area. The first functional layer 15 and the second functional layer 25 may be transistor layers, such as thin film transistors or field effect transistors. The spacer pillars are generally formed by a photolithography process, and the composition of the mainstream material is UV-curable acrylic resin.

The stacking height of the first photoresist layer 14 and the main spacer is greater than or equal to the stacking height of the second photoresist layer 24 and the sub spacer, and is equal to the height of the packaging adhesive layer 40, that is, the bottom surface of the first substrate is connected to the main spacer and the packaging adhesive layer 40, or may be connected to the sub spacer.

Further, for an embodiment in which the stacking height of the first photoresist layer 14 and the main spacer is equal to the stacking height of the second photoresist layer 24 and the sub spacer, it may be that the arrangement of the main spacer and the sub spacer is consistent with the prior art, but the stacking height is equal to that of the first photoresist layer 14 and the second photoresist layer 24 by adjusting the heights of the two, but not limited thereto. Further, it is another embodiment that the overlapping height of the first photoresist layer 14 and the main spacers is higher than the overlapping height of the second photoresist layer 24 and the sub spacers.

Similarly, the sub-spacer is also divided into a first sub-spacer 22 and a second sub-spacer 23, the second sub-spacer comprising: the first sub-groove 221 and the sub-protrusion 222; a second sub-groove 231 is further disposed on the second segment of sub-spacer.

Furthermore, the main spacing pillars and the first photoresist layer are used for supporting the gravity between the first substrate and the second substrate, and the sub spacing pillars and the second photoresist layer are used for supporting the gravity when the first substrate and the second substrate are acted by external force. When the display panel is not acted by external force, the gravity between the first substrate and the second substrate is mainly supported by the main spacing columns, and at the moment, the first grooves on the first section of main spacing columns just wrap the second section of main spacing columns, so that the pressure of the first section of main spacing columns can be supported to a certain extent; the convex part on the first section of main spacing column is suspended or just contacts with the second groove on the second section of main spacing column without acting force; when the display panel is subjected to a small external force, the convex part on the first section of main spacing column is in contact with the second groove on the second section of main spacing column and generates an acting force, the first sub-groove 221 on the first section of sub-spacing column wraps the second sub-groove 221 on the sub-spacing column, but the sub-convex part 222 on the first section of sub-spacing column is suspended or is just in contact with the second section of sub-spacing column 23 without acting force; when the force applied to the outside of the display panel is further increased, the sub-protrusion 222 on the first sub-spacer further contacts the second sub-groove 231 on the second sub-spacer, and generates a contact force and a reaction force to ensure that the display panel displays normally without generating Mura.

Further, under the condition of low temperature, liquid crystal molecules shrink, the pressure in the liquid crystal box becomes small, the external air pressure is greater than the pressure in the liquid crystal box, the first substrate 30 and the second substrate 40 are pressed, the thickness of the liquid crystal box is reduced, the pressure borne by the main spacing column is increased, the deformation is increased, and the height is reduced; when the liquid crystal continues to shrink, the cell thickness continues to decrease, and the convex part 121 starts to abut against the groove of the second groove 131, so that the stress of the sub-spacing column is relieved; and since the protrusion 121 drops into the groove of the second groove 131, the liquid crystal in the groove of the second groove 131 is squeezed out, preventing the liquid crystal from continuing to shrink to generate vacuum bubbles.

After the temperature rises, the liquid crystal molecules expand, the pressure in the liquid crystal box becomes higher, the external air pressure is smaller than the pressure in the liquid crystal box, so that the thickness of the liquid crystal box is increased, when the liquid crystal expands to a certain degree, the convex part 121 of the main spacing column is bounced back to a suspended state from the second groove 131, and the liquid crystal can be filled into the groove of the second groove 131, so that the generation of poor gravity is prevented.

The sub-interval pillars or the main interval pillars are distributed at intervals, so that the sub-interval pillars and the main interval pillars can support proper cell thickness and can realize uniform regulation and control of liquid crystal allowance.

For better control, both the sub-spacers and the main spacers may be generally made of an elastic material.

Specifically, the first photoresist layer 14 and the second photoresist layer 24 may be prepared by using a GTM (gray tone mask) process. When a photoresist layer with a higher height is needed, an exposure mask (mask) can be set to be solid, namely, the photoresist below the mask cannot be exposed and is not etched, and the thickness is reserved and is thicker. If the exposure light cover is set into a slit (slit), ultraviolet light enters the photoresist through the slit, and due to the adoption of the design that the size and the width of the slit are different, the exposure degree of the photoresist arranged below the slit is different, the etched degree is different, and the etched thickness is different. Thus, it is realized that one photomask can obtain different heights of the same photoresist layer in different regions, thereby realizing different heights of the first photoresist layer 14 and the second photoresist layer 24. The specific materials used in the photoresist layer may be those commonly used in the art, such as, but not limited to, resin materials.

Further, the photoresist can be divided into a negative photoresist and a positive photoresist, and for the reason of resolution, the positive photoresist is currently used as the main stream, and the negative photoresist is developed by dissolving the unexposed part after the exposed part is polymerized and hardened. In the present application, the main spacer uses a negative photoresist to perform a photomask, and the sub-spacers use a positive photoresist or a negative photoresist to perform a photomask.

Therefore, in the display panel provided by the present application, the structure of the spacer in the display panel is different from a general spacer structure, the first groove is arranged on one side of the first section of main spacer close to the second section of main spacer, and the middle of the first groove is provided with the convex portion, that is, two sides of the lower end surface of the first section of main spacer are high, and the middle is low; the first groove at the lower end of the first section of main spacing column surrounds the upper end face of the second section of main spacing column and is matched with the second section of main spacing column; when the display panel is under the action of external force, the convex part can apply a reaction force to the main spacing column, the thickness of the liquid crystal box is readjusted, mura is eliminated, and the display panel can normally display; further, second section main space post up end is provided with the second recess, the second recess just right on the first section main space post the convex part sets up, with the convex part cooperation is worked as display panel receives the exogenic action, the convex part can be better with the second recess is fixed a position, makes display panel can be faster the recovery deformation, and then has reduced the production of the peripheral mura of display area, it is corresponding, also improved display panel's demonstration quality.

The display panel provided by the embodiment of the present application is described in detail above, and a specific example is applied to illustrate the principle and the implementation manner of the present application, and the description of the embodiment is only used to help understanding the technical solution and the core idea of the present application; those of ordinary skill in the art will understand that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications or substitutions do not depart from the spirit and scope of the present disclosure as defined by the appended claims.

Claims

1. A display panel including a display region and a non-display region, the display panel comprising: a first substrate, a second substrate and a liquid crystal layer;

a functional layer, a light resistance layer and a spacing column which are sequentially overlapped from the second substrate to the first substrate are arranged between the first substrate and the second substrate,

the spacing columns are divided into main spacing columns and sub spacing columns, the main spacing columns are further divided into first sections of main spacing columns and second sections of main spacing columns, one sides of the first sections of main spacing columns are arranged on one sides of the first substrates, and the bottoms of the second sections of main spacing columns are arranged on one sides of the light resistance layers;

the periphery of the lower end face of the first section of the main spacing column is provided with a first groove, and the middle of the first groove is provided with a convex part;

the first groove at the lower end of the first section of main spacing column surrounds the upper end face of the second section of main spacing column and is matched with the second section of main spacing column;

the main spacing columns are arranged in the display area, and the sub spacing columns are arranged in the non-display area;

the sub-interval column comprises a first section sub-interval column and a second section sub-interval column, the bottom of the second section sub-interval column is arranged on one side of the photoresist layer, the first section sub-interval column is positioned above the second section sub-interval column, the lower end face of the first section sub-interval column and the upper end face of the second section sub-interval column are in clearance, a first sub-groove is formed in the periphery of the lower end face of the first section sub-interval column, a sub-convex portion is arranged in the middle of the first sub-groove, and the first sub-groove is used for surrounding the upper end face of the second section sub-interval column.

2. The display panel of claim 1, wherein an inner diameter of the first groove is larger than an outer diameter of the upper end surface of the second segment of main spacers, i.e. a gap exists between an inner wall of the first groove and an outer wall of the upper end surface of the second segment of main spacers.

3. The display panel according to claim 1, wherein the height of the convex portion is smaller than that of the first groove, that is, the highest point of the convex portion is lower than the edge around the first groove.

4. The display panel according to claim 1, wherein the upper end surface of the second segment of main spacers is provided with a second groove, and the second groove is disposed opposite to the convex portion of the first segment of main spacers and is engaged with the convex portion.

5. The display panel according to claim 4, wherein the depth of the second groove is smaller than the depth of the first groove, and the depth of the second groove is also smaller than the height of the convex portion.

6. The display panel of claim 1, wherein the spacers are each made of an elastic material.

7. The display panel of claim 1, wherein the main spacer is masked with a negative photoresist and the sub-spacers are masked with a positive photoresist or a negative photoresist.

8. The display panel according to claim 7, wherein the second segment of main spacer pillars uses two masks, the first segment of main spacer pillars uses three masks, and the light transmittance of each mask is different.

9. The display panel according to claim 8, wherein the transmittance of the first light mask of the second main spacer is 90%, and the transmittance of the second light mask of the second main spacer is 100%; the light transmittance of the first light shield of the first section of main spacer is 100%, the light transmittance of the second light shield of the first section of main spacer is 60%, and the light transmittance of the third light shield of the first section of main spacer is 90%.

10. The display panel according to claim 1, wherein the first substrate is a color film substrate, and the second substrate is an array substrate; and a black matrix is arranged between the spacer and the color film substrate.