Color filter substrate and liquid crystal display device

Abstract

The present invention provides a color filter substrate and a liquid crystal display device, belongs to the field of liquid crystal display technology, and can overcome the color shift problems in existing liquid crystal display device. The color filter substrate of the present invention comprises: a first substrate, a black matrix and a color film layer provided on the first substrate, wherein the color film layer comprises a plurality of pixel units arranged periodically and repeatedly in a matrix, each pixel unit includes at least two sub-pixels of different colors, each sub-pixel comprises a color filter film, a first common electrode disposed on the color filter film, and a dielectric layer disposed on the first common electrode, wherein the thicknesses of the dielectric layer at at least two locations within each pixel unit are different.

1 . A color filter substrate, comprising: a first substrate, a black matrix and a color film layer provided on the first substrate, wherein the color film layer comprises a plurality of pixel units arranged periodically and repeatedly in a matrix, each pixel unit comprises at least two sub-pixels of different colors, each sub-pixel comprises a color filter film, a first common electrode disposed on the color filter film, and a dielectric layer disposed on the first common electrode, wherein the thicknesses of the dielectric layer at at least two locations within each pixel unit are different,
 wherein the thicknesses of the dielectric layer at at least two locations are different in at least one sub-pixel of each pixel unit,   wherein in each sub-pixel of each pixel unit, the dielectric layer is divided into two regions, a central region and a peripheral region surrounding the central region, which respectively have two different thicknesses, a first thickness at the peripheral region and a second thickness at the central region, and the first thickness is larger than the second thickness.   
     
     
         2 . The color filter substrate according to  claim 1 , wherein the dielectric layer is symmetry with respect to a central axis of the sub-pixel in each sub-pixel of each pixel unit. 
     
     
         3 . The color filter substrate according to  claim 2 , wherein the first thicknesses of the at least two sub-pixels of each pixel unit are the same to each other, and the second thicknesses of the at least two sub-pixels of each pixel unit are the same to each other. 
     
     
         4 . The color filter substrate according to  claim 1 , wherein the dielectric constant of the dielectric layer ranges from 2 to 5. 
     
     
         5 . The color filter substrate according to  claim 1 , wherein the thickness of the dielectric layer ranges from 1.5 to 6.5 μm. 
     
     
         6 . A color filter substrate, comprising: a first substrate, a black matrix and a color film layer provided on the first substrate, wherein the color film layer comprises a plurality of pixel units arranged periodically and repeatedly in a matrix, each pixel unit comprises at least two sub-pixels of different colors, each sub-pixel comprises a color filter film, a first common electrode disposed on the color filter film, and a dielectric layer disposed on the first common electrode, wherein the thicknesses of the dielectric layer at at least two locations within each pixel unit are different,
 wherein the thicknesses of the dielectric layer at at least two locations are different in at least one sub-pixel of each pixel unit, and   wherein in each sub-pixel of each pixel unit, a thickness of the dielectric layer changes gradually from one side of the sub-pixel to an opposite side of the sub-pixel.   
     
     
         7 . The color filter substrate according to  claim 6 , wherein the dielectric layers of every two adjacent sub-pixels are connected at a position corresponding to the black matrix. 
     
     
         8 . The color filter substrate according to  claim 6 , wherein an angle between a surface of the dielectric layer away from the first common electrode and the plane where the first substrate is located is α in at least one sub-pixel of each pixel unit, and a ranges from 5 to 10 degrees. 
     
     
         9 . The color filter substrate according to  claim 8 , wherein the pixel unit comprises a red sub-pixel, a green sub-pixel and a blue sub-pixel, the angle between a surface of the dielectric layer away from the first common electrode and the plane where the first substrate is located is αR at the red sub pixel, the angle between a surface of the dielectric layer away from the first common electrode and the plane where the first substrate is located is αG at the green sub pixel, and the angle between a surface of the dielectric layer away from the first common electrode and the plane where the first substrate is located is αB at the blue sub pixel, wherein αR=αG=αB. 
     
     
         10 . The color filter substrate according to  claim 9 , wherein the maximum thickness of the dielectric layer at the red sub-pixel is dR, the maximum thickness of the dielectric layer at the green sub-pixel is dG, and the maximum thickness of the dielectric layer at the blue sub-pixel is dB, wherein dR>dG>dB. 
     
     
         11 . The color filter substrate according to  claim 9 , wherein the maximum thickness of the dielectric layer at the red sub-pixel is dR, the maximum thickness of the dielectric layer at the green sub-pixel is dG, and the maximum thickness of the dielectric layer at the blue sub-pixel is dB, wherein dR=dG=dB. 
     
     
         12 . The color filter substrate according to  claim 8 , wherein the pixel unit comprises a red sub-pixel, a green sub-pixel and a blue sub-pixel, the angle between a surface of the dielectric layer away from the common electrode and the plane where the first substrate is located is αR at the red sub pixel, the angle between a surface of the dielectric layer away from the common electrode and the plane where the first substrate is located is αG at the green sub pixel, and the angle between a surface of the dielectric layer away from the common electrode and the plane where the first substrate is located is αB at the blue sub pixel, wherein αR>αG>αB. 
     
     
         13 . The color filter substrate according to  claim 6 , wherein the dielectric constant of the dielectric layer ranges from 2 to 5. 
     
     
         14 . The color filter substrate according to  claim 6 , wherein the thickness of the dielectric layer ranges from 1.5 to 6.5 μm. 
     
     
         15 . The color filter substrate according to  claim 6 , wherein the dielectric layers of at least two adjacent sub-pixels are connected at a position corresponding to a maximum thickness of one sub-pixel and a minimum thickness of the other sub-pixel. 
     
     
         16 . A liquid crystal display device, comprising the color filter substrate of  claim 1  and an opposite substrate. 
     
     
         17 . The liquid crystal display device according to  claim 16 , wherein the opposite substrate comprises a second substrate, pixel electrodes and second common electrodes and the pixel electrodes and the second common electrodes are strip-shaped electrodes disposed with intervals on the second substrate;
 the opposite substrate comprises a second substrate, pixel electrodes, second common electrodes and an insulation layer, the pixel electrodes are plate-shaped electrodes disposed on the second substrate, and the second common electrodes are strip-shaped electrodes disposed above the pixel electrodes, and are separated from the pixel electrodes by a planarization layer; or   the opposite substrate comprises a second substrate, pixel electrodes, second common electrodes and an insulation layer, the second common electrodes are plate-shaped electrodes disposed on the second substrate, and the pixel electrodes are strip-shaped electrodes disposed above the second common electrodes, and are separated from the second common electrode by a planarization layer.   
     
     
         18 . A liquid crystal display device, comprising the color filter substrate of  claim 6  and an opposite substrate. 
     
     
         19 . The liquid crystal display device according to  claim 18 , wherein an angle between a surface of the dielectric layer away from the first common electrode and the plane where the first substrate is located is α in at least one sub-pixel of each pixel unit, and α ranges from 5 to 10 degrees. 
     
     
         20 . The liquid crystal display device according to  claim 18 , wherein the opposite substrate comprises a second substrate, pixel electrodes and second common electrodes and the pixel electrodes and the second common electrodes are strip-shaped electrodes disposed with intervals on the second substrate;
 the opposite substrate comprises a second substrate, pixel electrodes, second common electrodes and an insulation layer, the pixel electrodes are plate-shaped electrodes disposed on the second substrate, and the second common electrodes are strip-shaped electrodes disposed above the pixel electrodes, and are separated from the pixel electrodes by a planarization layer; or   the opposite substrate comprises a second substrate, pixel electrodes, second common electrodes and an insulation layer, the second common electrodes are plate-shaped electrodes disposed on the second substrate, and the pixel electrodes are strip-shaped electrodes disposed above the second common electrodes, and are separated from the second common electrode by a planarization layer.