Curved display panel and curved display device

Abstract

A curved display panel and a curved display device are provided. The curved display panel comprises a curved thin film transistor array substrate, a liquid crystal layer, a curved color filter substrate, and a spacer assembly. The spacer assembly is used to maintain a predetermined distance between the curved thin film transistor array substrate and the curved color filter substrate. A display defect caused by an uneven cell thickness of the curved display panel is avoided.

1 . A curved display panel, comprising:
 a curved thin film transistor array substrate;   a liquid crystal layer;   a curved color filter substrate; and   a spacer assembly disposed on the curved color filter substrate, wherein the spacer assembly is used to maintain a predetermined distance between the curved thin film transistor array substrate and the curved color filter substrate;   wherein the curved display panel comprises:
 at least one first area positioned in the middle of the curved display panel; and 
 at least two second areas positioned at two sides of the first area along a curve of the curved display panel; 
 wherein the curved color filter substrate and the curved thin film transistor array substrate are assembled into one piece; and the liquid crystal layer is disposed between the curved color filter substrate and the curved thin film transistor array substrate; 
 wherein in the first area a first interval is formed between the curved color filter substrate and the curved thin film transistor array substrate; and in the second area, a second interval is formed between the curved color filter substrate and the curved thin film transistor array substrate; and the first interval is equal to the second interval; 
   wherein the curved display panel is formed by bending a flat display panel which is composed of a flat color filter substrate and a flat thin film transistor array substrate;   wherein the curved color filter substrate is a flat color filter substrate when it is in a flat position; and the curved thin film transistor array substrate is a flat thin film transistor array substrate when it is in a flat position;   wherein a third interval is formed between the flat color filter substrate and the flat thin film transistor array substrate of the flat display panel;   wherein the spacer assembly is used to form the first interval in the first area when the flat display panel has been bent, and is used to form the second interval in the second area when the flat display panel has been bent; and   wherein the curved display panel is further provided with a sealant.   
     
     
         2 . The curved display panel according to  claim 1 , wherein the spacer assembly comprises:
 at least one first spacer, wherein the first spacer is disposed in the first area; and before the flat color filter substrate is bent into the curved color filter substrate, corresponding to the plane of the flat color filter substrate, the first spacer has a first height in a first direction; wherein the first direction is a direction which is perpendicular to the flat color filter substrate; and   at least two second spacers, wherein the second spacer is disposed in the second area; and before the flat color filter substrate is bent into the curved color filter substrate, corresponding to the plane of the flat color filter substrate, the second spacer has a second height in the first direction;   wherein the first height is greater than the second height.   
     
     
         3 . The curved display panel according to  claim 2 , wherein after the flat color filter substrate has been bent into the curved color filter substrate, the first spacer has a third height, and the second spacer has a fourth height;
 the third height is equal to the predetermined distance, and the fourth height is equal to the predetermined distance;   the first spacer is used to be shrunken from the first height to the third height by a compression of the curved color filter substrate and the curved thin film transistor array substrate;   the second spacer is used to be shrunken from the second height to the fourth height by the compression of the curved color filter substrate and the curved thin film transistor array substrate.   
     
     
         4 . The curved display panel according to  claim 3 , wherein in the first area, the sum of a first deformation amount of the curved color filter substrate and a second deformation amount of the curved thin film transistor array substrate is equal to or greater than a first compression amount of the first spacer, wherein the first compression amount is a deformation amount of the first spacer which is compressed by the curved color filter substrate and the curved thin film transistor array substrate;
 in the second area, the sum of a third deformation amount of the curved color filter substrate and a fourth deformation amount of the curved thin film transistor array substrate is equal to or greater than a second compression amount of the second spacer, wherein the second compression amount is a deformation amount of the second spacer which is compressed by the curved color filter substrate and the curved thin film transistor array substrate; the second compression amount is the difference of the second height and the fourth height;   the first deformation amount is an amount which projects on the first surface of the curved color filter substrate in the first area along the first curvature radius and toward the curved thin film transistor array substrate; and the first curvature radius is a curvature radius in the first area of the curved color filter substrate, and the first surface is a surface of the curved color filter substrate which faces the liquid crystal layer;   the second deformation amount is an amount which projects or recesses on the second surface of the curved thin film transistor array substrate in the first area along the first curvature radius and toward the curved color filter substrate; and the second surface is a surface of the thin film transistor array substrate which faces the liquid crystal layer;   the third deformation amount is an amount which projects on the first surface of the curved color filter substrate in the second area along a second curvature radius and toward the curved thin film transistor array substrate; the second curvature radius is a curvature radius in the second area of the curved color filter substrate; and   the fourth deformation amount is an amount which projects on the second surface of the curved thin film transistor array substrate in the second area along a second curvature radius and toward the curved color filter substrate.   
     
     
         5 . A curved display panel, comprising:
 a curved thin film transistor array substrate;   a liquid crystal layer;   a curved color filter substrate; and   a spacer assembly disposed on the curved color filter substrate, wherein the spacer assembly is used to maintain a predetermined distance between the curved thin film transistor array substrate and the curved color filter substrate;   wherein the curved display panel comprises:   at least one first area positioned in the middle of the curved display panel; and   at least two second areas positioned at two sides of the first area along a curve of the curved display panel;   wherein the curved color filter substrate and the curved thin film transistor array substrate are assembled into one piece; and the liquid crystal layer is disposed between the curved color filter substrate and the curved thin film transistor array substrate;   wherein, in the first area, a first interval is formed between the curved color filter substrate and the curved thin film transistor array substrate; and in the second area, a second interval is formed between the curved color filter substrate and the curved thin film transistor array substrate; and the first interval is equal to the second interval.   
     
     
         6 . The curved display panel according to  claim 5 , wherein the curved display panel is formed by bending a flat display panel which is composed of a flat color filter substrate and a flat thin film transistor array substrate;
 wherein the curved color filter substrate is a flat color filter substrate when it is in a flat position, and the curved thin film transistor array substrate is a flat thin film transistor array substrate when it is in a flat position;   wherein a third interval is formed between the flat color filter substrate and the flat thin film transistor array substrate of the flat display panel; and   wherein the spacer assembly is used to form the first interval in the first area when the flat display panel has been bent, and is used to form the second interval in the second area when the flat display panel has been bent.   
     
     
         7 . The curved display panel according to  claim 6 , wherein the spacer assembly comprises:
 at least one first spacer, wherein the first spacer is disposed in the first area; and before the flat color filter substrate is bent into the curved color filter substrate, corresponding to the plane of the flat color filter substrate, the first spacer has a first height in a first direction; wherein the first direction is a direction which is perpendicular to the flat color filter substrate; and   at least two second spacers, wherein the second spacer is disposed in the second area; and before the flat color filter substrate is bent into the curved color filter substrate, corresponding to the plane of the flat color filter substrate, the second spacer has a second height in the first direction;   wherein the first height is greater than the second height.   
     
     
         8 . The curved display panel according to  claim 7 , wherein after the flat color filter substrate has been bent into the curved color filter substrate, the first spacer has a third height, and the second spacer has a fourth height;
 the third height is equal to the predetermined distance, and the fourth height is equal to the predetermined distance;   the first spacer is used to be shrunken from the first height to the third height by a compression of the curved color filter substrate and the curved thin film transistor array substrate;   the second spacer is used to be shrunken from the second height to the fourth height by the compression of the curved color filter substrate and the curved thin film transistor array substrate.   
     
     
         9 . The curved display panel according to  claim 8 , wherein in the first area, the sum of a first deformation amount of the curved color filter substrate and a second deformation amount of the curved thin film transistor array substrate is equal to or greater than a first compression amount of the first spacer, wherein the first compression amount is a deformation amount of the first spacer which is compressed by the curved color filter substrate and the curved thin film transistor array substrate;
 in the second area, the sum of a third deformation amount of the curved color filter substrate and a fourth deformation amount of the curved thin film transistor array substrate is equal to or greater than a second compression amount of the second spacer, wherein the second compression amount is a deformation amount of the second spacer which is compressed by the curved color filter substrate and the curved thin film transistor array substrate; the second compression amount is the difference of the second height and the fourth height;   the first deformation amount is an amount which projects on the first surface of the curved color filter substrate, in the first area along the first curvature radius and toward the curved thin film transistor array substrate; and the first curvature radius is a curvature radius in the first area of the curved color filter substrate, and the first surface is a surface of the curved color filter substrate which faces the liquid crystal layer;   the second deformation amount is an amount which projects or recesses on the second surface of the curved thin film transistor array substrate in the first area along the first curvature radius and toward the curved color filter substrate; and the second surface is a surface of the thin film transistor array substrate which faces the liquid crystal layer;   the third deformation amount is an amount which projects on the first surface of the curved color filter substrate, in the second area along a second curvature radius and toward the curved thin film transistor array substrate; the second curvature radius is a curvature radius in the second area of the curved color filter substrate; and   the fourth deformation amount is an amount which projects on the second surface of the curved thin film transistor array substrate, in the second area along a second curvature radius and toward the curved color filter substrate.   
     
     
         10 . The curved display panel according to  claim 9 , wherein a formula for calculating an m-th deformation amount ΔHm of the curved color filter substrate is:
   Δ Hm=εm*Dm;  
 
 the εm is a strain in an m-th area of the first surface of the curved color filter substrate; the Dm is a thickness in the m-th area of the first surface of the curved color filter substrate; a formula for calculating the εm is:
   ε m =ln {[(η m+ym )* am ]/(η m*am )}=ln [1+( ym/ηm )]≅ ym/ηm;  
 
 
 the ηm is a curvature radius in the m-th area of a middle layer of the curved color filter substrate; the ym is a distance from a deforming point to the middle layer of the curved color filter substrate; the am is a corresponding angle in the m-th area of the middle layer of the first surface of the curved color filter substrate; m is a positive integer; 
 a formula for calculating an n-th deformation amount ΔHn of the curved thin film transistor array substrate is:
   Δ Hn=εn*Dn;  
 
 
 the εn is a strain in an n-th area of the second surface of the curved thin film transistor array substrate; the Dn is a thickness in the n-th area of the first surface of the curved thin film transistor array substrate; a formula for calculating the εn is:
   ε n =ln {[(η n+yn )* an ]/(η n*an )}=ln [1+( yn/ηn )]≅ yn/ηn;  
 
 
 the ηn is a curvature radius in the n-th area of a middle layer of the curved thin film transistor array substrate; the yn is a distance from a deforming point to the middle layer of the curved thin film transistor array substrate; the an is a corresponding angle in the n-th area of the middle layer of the first surface of the curved thin film transistor array substrate; n is a positive integer. 
 
     
     
         11 . The curved display panel according to  claim 10 , wherein the m-th deformation amount ΔHm comprises: a first deformation amount and a third deformation amount; and
 the n-th deformation amount ΔHn comprises: a second deformation amount and a fourth deformation amount. 
 
     
     
         12 . The curved display panel according to  claim 7 , wherein the first spacer with the first height and the second spacer with the second height are formed by different predetermined exposure amounts. 
     
     
         13 . A curved display device, comprising:
 a curved backlight module; and   a curved display panel, wherein the curved display panel and the curved backlight module are stacked and combined into one piece, and the curved display panel comprises:
 a curved thin film transistor array substrate; 
 a liquid crystal layer; 
 a curved color filter substrate; and 
 a spacer assembly disposed on the curved color filter substrate, wherein the spacer assembly is used to maintain a predetermined distance between the curved thin film transistor array substrate and the curved color filter substrate; 
 wherein the curved display panel comprises: 
 at least one first area positioned in the middle of the curved display panel; and 
 at least two second areas positioned at two sides of the first area along a curve of the curved display panel; 
 wherein the curved color filter substrate and the curved thin film transistor array substrate are assembled into one piece; and the liquid crystal layer is disposed between the curved color filter substrate and the curved thin film transistor array substrate; 
 wherein, in the first area, a first interval is formed between the curved color filter substrate and the curved thin film transistor array substrate; and in the second area, a second interval is formed between the curved color filter substrate and the curved thin film transistor array substrate; and the first interval is equal to the second interval. 
   
     
     
         14 . The curved display device according to  claim 13 , wherein the curved display panel is formed by bending a flat display panel which is composed of a flat color filter substrate and a flat thin film transistor array substrate;
 wherein the curved color filter substrate is a flat color filter substrate when it is in a flat position, and the curved thin film transistor array substrate is a flat thin film transistor array substrate when it is in a flat position;   wherein a third interval is formed between the flat color filter substrate and the flat thin film transistor array substrate of the flat display panel; and   wherein the spacer assembly is used to form the first interval in the first area when the flat display panel has been bent, and is used to form the second interval in the second area when the flat display panel has been bent.   
     
     
         15 . The curved display device according to  claim 14 , wherein the spacer assembly comprises:
 at least one first spacer, wherein the first spacer is disposed in the first area; and before the flat color filter substrate is bent into the curved color filter substrate, corresponding to the plane of the flat color filter substrate, the first spacer has a first height in a first direction; wherein the first direction is a direction which is perpendicular to the flat color filter substrate; and   at least two second spacers, wherein the second spacer is disposed in the second area; and before the flat color filter substrate is bent into the curved color filter substrate, corresponding to the plane of the flat color filter substrate, the second spacer has a second height in the first direction;   wherein the first height is greater than the second height.   
     
     
         16 . The curved display device according to  claim 15 , wherein after the flat color filter substrate has been bent into the curved color filter substrate, the first spacer has a third height, and the second spacer has a fourth height;
 the third height is equal to the predetermined distance, and the fourth height is equal to the predetermined distance;   the first spacer is used to be shrunken from the first height to the third height by a compression of the curved color filter substrate and the curved thin film transistor array substrate;   the second spacer is used to be shrunken from the second height to the fourth height by the compression of the curved color filter substrate and the curved thin film transistor array substrate.   
     
     
         17 . The curved display device according to  claim 16 , wherein in the first area, the sum of a first deformation amount of the curved color filter substrate and a second deformation amount of the curved thin film transistor array substrate is equal to or greater than a first compression amount of the first spacer, wherein the first compression amount is a deformation amount of the first spacer which is compressed by the curved color filter substrate and the curved thin film transistor array substrate;
 in the second area, the sum of a third deformation amount of the curved color filter substrate and a fourth deformation amount of the curved thin film transistor array substrate is equal to or greater than a second compression amount of the second spacer, wherein the second compression amount is a deformation amount of the second spacer which is compressed by the curved color filter substrate and the curved thin film transistor array substrate; the second compression amount is the difference of the second height and the fourth height;   the first deformation amount is an amount which projects on the first surface of the curved color filter substrate, in the first area along the first curvature radius and toward the curved thin film transistor array substrate; and the first curvature radius is a curvature radius in the first area of the curved color filter substrate, and the first surface is a surface of the curved color filter substrate which faces the liquid crystal layer;   the second deformation amount is an amount which projects or recesses on the second surface of the curved thin film transistor array substrate in the first area along the first curvature radius and toward the curved color filter substrate; and the second surface is a surface of the thin film transistor array substrate which faces the liquid crystal layer;   the third deformation amount is an amount which projects on the first surface of the curved color filter substrate, in the second area along a second curvature radius and toward the curved thin film transistor array substrate; the second curvature radius is a curvature radius in the second area of the curved color filter substrate; and   the fourth deformation amount is an amount which projects on the second surface of the curved thin film transistor array substrate, in the second area along a second curvature radius and toward the curved color filter substrate.   
     
     
         18 . The curved display device according to  claim 17 , wherein a formula for calculating an m-th deformation amount ΔHm of the curved color filter substrate is:
   Δ Hm=εm*Dm;  
 
 the εm is a strain in an m-th area of the first surface of the curved color filter substrate; the Dm is a thickness in the m-th area of the first surface of the curved color filter substrate; a formula for calculating the εm is:
   ε m =ln {[(η m+ym )* am ]/(η m*am )}=ln [1+( ym/ηm )]≅ ym/ηm;  
 
 
 the ηm is a curvature radius in the m-th area of a middle layer of the curved color filter substrate; the ym is a distance from a deforming point to the middle layer of the curved color filter substrate; the am is a corresponding angle in the m-th area of the middle layer of the first surface of the curved color filter substrate; m is a positive integer; 
 a formula for calculating an n-th deformation amount ΔHn of the curved thin film transistor array substrate is:
   Δ Hn=εn*Dn;  
 
 
 the εn is a strain in an n-th area of the second surface of the curved thin film transistor array substrate; the Dn is a thickness in the n-th area of the first surface of the curved thin film transistor array substrate; a formula for calculating the εn is:
   ε n =ln {[(η n+yn )* an ]/(η n*an )}=ln [1+( yn/ηn )]≅ yn/ηn;  
 
 
 the ηn is a curvature radius in the n-th area of a middle layer of the curved thin film transistor array substrate; the yn is a distance from a deforming point to the middle layer of the curved thin film transistor array substrate; the an is a corresponding angle in the n-th area of the middle layer of the first surface of the curved thin film transistor array substrate; n is a positive integer. 
 
     
     
         19 . The curved display device according to  claim 18 , wherein the m-th deformation amount ΔHm comprises: a first deformation amount and a third deformation amount; and
 the n-th deformation amount ΔHn comprises: a second deformation amount and a fourth deformation amount. 
 
     
     
         20 . The curved display panel according to  claim 15 , wherein the first spacer with the first height and the second spacer with the second height are formed by different predetermined exposure amounts.