Liquid crystal display panel and liquid crystal display device

Patent metadata

Field	Value
Publication number	US-12572045-B2
Application number	US-202318038999-A
Country	US
Kind code	B2
Filing date	Mar 31, 2023
Priority date	Mar 29, 2023
Publication date	Mar 10, 2026
Grant date	Mar 10, 2026

Abstract

The present application provides a liquid crystal display panel and a liquid crystal display device. The liquid crystal display panel makes the second capacitor of the first sub-pixel greater than the second capacitor of the second sub-pixel and connects a drain electrode to a pixel electrode such that a ratio of the first capacitor of the first sub-pixel in a capacitor formed by and connected to the pixel electrode is similar to or even the same as a ratio of the first capacitor of the second sub-pixel in the capacitor formed by and connected to the pixel electrode, which avoids issues of display crosstalk and afterimage.

First claim

What is claimed is:

1 . A liquid crystal display panel, comprising:
a base substrate; a first metal layer disposed on a side of the base substrate, wherein the first metal layer comprises a gate electrode; a second metal layer disposed on a side of the first metal layer, wherein the second metal layer comprises a drain electrode; and a pixel electrode layer disposed on a side of the second metal layer away from the base substrate, wherein the pixel electrode layer comprises a pixel electrode, and the pixel electrode is electrically connected to the drain electrode; wherein the pixel electrode and the gate electrode form a first capacitor; the drain electrode and the gate electrode form a second capacitor; the liquid crystal display panel comprises a plurality of pixel units disposed in an array, each of the pixel units comprises a first sub-pixel and a second sub-pixel displaying different colors; the first capacitor of the first sub-pixel is less than the first capacitor of the second sub-pixel, and the second capacitor of the first sub-pixel is greater than the second capacitor of the second sub-pixel.

2 . The liquid crystal display panel according to claim 1 , further comprising a common electrode layer, wherein the pixel electrode and the common electrode layer form a third capacitor; a ratio of the first capacitor of the first sub-pixel to a sum of the first capacitor, the second capacitor, and the third capacitor of the first sub-pixel, is equal to a ratio of the first capacitor of the second sub-pixel to a sum of the first capacitor, the second capacitor, and the third capacitor of the second sub-pixel.

3 . The liquid crystal display panel according to claim 1 , wherein a directly opposite area of the drain electrode of the first sub-pixel and the gate electrode of the first sub-pixel, is greater than a directly opposite area of the drain electrode of the second sub-pixel and the gate electrode of the second sub-pixel.

4 . The liquid crystal display panel according to claim 3 , wherein in a region of the drain electrode directly facing the gate electrode, a width of the gate electrode of the first sub-pixel is equal to a width of the gate electrode of the second sub-pixel, and a width of at least one portion of the drain electrode of the first sub-pixel is greater than a width of the drain electrode of the second sub-pixel.

5 . The liquid crystal display panel according to claim 4 , wherein in the region of the drain electrode directly facing the gate electrode, the drain electrode of the first sub-pixel comprises a first portion and a second portion, and a width of the first portion is greater than a width of the second portion.

6 . The liquid crystal display panel according to claim 4 , wherein in the region of the drain electrode directly facing the gate electrode, and a width of each portion of the drain electrode of the first sub-pixel is consistent.

7 . The liquid crystal display panel according to claim 1 , wherein an interval of the drain electrode of the first sub-pixel and the gate electrode of the first sub-pixel, is less than an interval of the drain electrode of the second sub-pixel and the gate electrode of the second sub-pixel.

8 . The liquid crystal display panel according to claim 1 , wherein the liquid crystal display panel further comprises a color resist layer, the color resist layer is disposed between the first metal layer and the pixel electrode layer, the color resist layer comprises a first color resist corresponding to the first sub-pixel and a second color resist corresponding to the second sub-pixel, and a thickness of the first color resist is greater than a thickness of the second color resist.

9 . The liquid crystal display panel according to claim 8 , wherein the color resist layer further comprises a third color resist, and a thickness of the third color resist is equal to a thickness of the second color resist.

10 . The liquid crystal display panel according to claim 8 , wherein the first color resist comprises a blue color resist, and the second color resist comprises one of a red color resist and a green color resist.

11 . A liquid crystal display device, comprising a liquid crystal display panel and a backlight module, wherein the liquid crystal display panel is disposed in a light exiting direction of the backlight module, and the liquid crystal display panel comprises:
a base substrate; a first metal layer disposed on a side of the base substrate, wherein the first metal layer comprises a gate electrode; a second metal layer disposed on a side of the first metal layer, wherein the second metal layer comprises a drain electrode; and a pixel electrode layer disposed on a side of the second metal layer away from the base substrate, wherein the pixel electrode layer comprises a pixel electrode, and the pixel electrode is electrically connected to the drain electrode; wherein the pixel electrode and the gate electrode form a first capacitor, the drain electrode and the gate electrode form a second capacitor, the liquid crystal display panel comprises a plurality of pixel units disposed in an array, each of the pixel units comprises a first sub-pixel and a second sub-pixel displaying different colors; the first capacitor of the first sub-pixel is less than the first capacitor of the second sub-pixel, and the second capacitor of the first sub-pixel is greater than the second capacitor of the second sub-pixel.

12 . The liquid crystal display device according to claim 11 , wherein the liquid crystal display panel further comprises a common electrode layer, the pixel electrode and the common electrode layer form a third capacitor, a ratio of the first capacitor of the first sub-pixel to a sum of the first capacitor, the second capacitor, and the third capacitor of the first sub-pixel, is equal to a ratio of the first capacitor of the second sub-pixel to a sum of the first capacitor, the second capacitor, and the third capacitor of the second sub-pixel.

13 . The liquid crystal display device according to claim 11 , wherein a directly opposite area of the drain electrode of the first sub-pixel and the gate electrode of the first sub-pixel, is greater than a directly opposite area of the drain electrode of the second sub-pixel and the gate electrode of the second sub-pixel.

14 . The liquid crystal display device according to claim 13 , wherein in a region of the drain electrode directly facing the gate electrode, a width of the gate electrode of the first sub-pixel is equal to a width of the gate electrode of the second sub-pixel, and a width of at least one portion of the drain electrode of the first sub-pixel is greater than a width of the drain electrode of the second sub-pixel.

15 . The liquid crystal display device according to claim 14 , wherein in the region of the drain electrode directly facing the gate electrode, the drain electrode of the first sub-pixel comprises a first portion and a second portion, and a width of the first portion is greater than a width of the second portion.

16 . The liquid crystal display device according to claim 14 , wherein in the region of the drain electrode directly facing the gate electrode, and a width of each portion of the drain electrode of the first sub-pixel is consistent.

17 . The liquid crystal display device according to claim 11 , wherein an interval of the drain electrode of the first sub-pixel and the gate electrode of the first sub-pixel, is less than an interval of the drain electrode of the second sub-pixel and the gate electrode of the second sub-pixel.

Assignees

• Huizhou China Star Optoelectronics Display Co Ltd
• Tcl China Star Optoelectronics Tech Co Ltd

Inventors

• Yong Weina
• Du Peng

Classifications

• G02F1/136213 Primary

  Storage capacitors associated with the pixel electrode · CPC title

• G02F1/133514

  Colour filters · CPC title

• G02F1/136222

  Colour filters incorporated in the active matrix substrate · CPC title

• G02F1/1368 Primary

  in which the switching element is a three-electrode device {(G02F1/136277 takes precedence)} · CPC title

• G02F1/136227

  Through-hole connection of the pixel electrode to the active element through an insulation layer · CPC title