Liquid crystal display device

Patent metadata

Field	Value
Publication number	US-9798182-B2
Application number	US-201514637268-A
Country	US
Kind code	B2
Filing date	Mar 3, 2015
Priority date	Sep 4, 2014
Publication date	Oct 24, 2017
Grant date	Oct 24, 2017

Abstract

A liquid crystal display (LCD) device, including a lower polarizing plate configured to have a transmission axis in a first direction, a liquid crystal layer on the lower polarizing plate, an upper polarizing plate on the liquid crystal layer, the upper polarizing plate including a first polarizing plate and a second polarizing plate, the first polarizing plate having a transmission axis in the first direction, the second polarizing plate having a transmission axis in a second direction perpendicular to the first direction, and color filters including a white filter and a colored filter, the white filter overlapping with the first polarizing plate, and the color filter overlapping with the second polarizing plate.

First claim

What is claimed is:

1. A liquid crystal display (LCD) device, comprising:
a lower polarizing plate configured to have a transmission axis in a first direction;
a liquid crystal layer on the lower polarizing plate;
an upper polarizing plate on the liquid crystal layer, the upper polarizing plate comprising a first polarizing plate and a second polarizing plate, the first polarizing plate having a transmission axis in the first direction, the second polarizing plate having a transmission axis in a second direction perpendicular to the first direction, the first and the second polarizing plates being at a same layer; and
a plurality of filters comprising a white filter and a colored filter, the white filter overlapping with the first polarizing plate having the transmission axis in the first direction, and the colored filter overlapping with the second polarizing plate having the transmission axis in a second direction,
wherein the liquid crystal layer is configured to align liquid crystal molecules overlapping with the first polarizing plate to be in the second direction to not permit backlight-emitted light to transmit through the first polarizing plate in response to a voltage being applied to the liquid crystal layer, and to realign the liquid crystal molecules to permit backlight-emitted light to transmit through the first polarizing plate and the white filter in response to no voltage being applied to the liquid crystal layer.

2. The LCD device of claim 1 , further comprising:
an array substrate below the liquid crystal layer, the array substrate comprising a plurality of pixels arranged in a matrix; and
an encapsulation substrate above the liquid crystal layer and encapsulating the liquid crystal layer.

3. The LCD device of claim 2 , wherein the lower polarizing plate is above or below the array substrate, and the upper polarizing plate is above or below the encapsulation substrate.

4. The LCD device of claim 2 , wherein each of the pixels overlaps with the white filter or the colored filter.

5. The LCD device of claim 2 , wherein each of the pixels comprises a plurality of sub-pixels, and each of the sub-pixels overlaps with the white filter or the colored filter.

6. The LCD device of claim 2 , wherein the white filter and the colored filter are alternately arranged in a row direction or in a column direction.

7. The LCD device of claim 2 , wherein the white filter and the colored filter are alternately arranged in a row direction and a column direction.

8. The LCD device of claim 1 , wherein the liquid crystal layer comprises a plurality of liquid crystal molecules aligned in the first direction.

9. The LCD device of claim 8 , wherein at least a portion of the plurality of liquid crystal molecules in a region overlapping with the first polarizing plate are configured to remain aligned in the second direction while a voltage is applied to the liquid crystal layer.

10. The LCD device of claim 8 , wherein the liquid crystal molecules are configured to change their alignment according to a voltage applied to the liquid crystal layer.

11. An LCD display device, comprising:
an array substrate comprising a first area and a second area, the first area overlapping with a white filter, and the second area overlapping with a colored filter;
a liquid crystal layer on the array substrate; and
an upper polarizing plate and a lower polarizing plate facing each other with the array substrate interposed therebetween,
wherein the lower polarizing plate is configured to have a transmission axis in a first direction, the upper polarizing plate comprises a first polarizing plate having a transmission axis in the first direction, and a second polarizing plate having a transmission axis in a second direction that is perpendicular to the first direction, the first area overlaps with the first polarizing plate, and the second area overlaps with the second polarizing plate, the first and the second polarizing plates being at a same layer, and
wherein the liquid crystal layer is configured to align liquid crystal molecules overlapping with the first polarizing plate to be in the second direction to not permit backlight-emitted light to transmit through the first polarizing plate in response to a voltage being applied to the liquid crystal layer, and to realign the liquid crystal molecules to permit backlight-emitted light to transmit through the first polarizing plate and the white filter in response to no voltage being applied to the liquid crystal layer.

12. The LCD display device of claim 11 , further comprising:
an encapsulation substrate facing the array substrate and seal the array substrate; and
a liquid crystal layer between the encapsulation substrate and the array substrate.

13. The LCD display device of claim 12 , wherein the lower polarizing plate is located above or below the array substrate and the upper polarizing plate is located above or below the encapsulation substrate.

14. The LCD display device of claim 11 , wherein the liquid crystal layer comprises a plurality of liquid crystal molecules aligned in the first direction.

15. The LCD device of claim 14 , wherein at least a portion of the plurality of liquid crystal molecules in the first area are configured to remain aligned in the first direction while a voltage is applied to the liquid crystal layer.

16. The LCD device of claim 14 , wherein the liquid crystal molecules are configured to change their alignment according to a voltage applied to the liquid crystal layer.

17. The LCD device of claim 11 , wherein the first area and the second area are defined by an imaginary line that vertically or horizontally extends across the array substrate.

18. An LCD device, comprising:
an array substrate comprising a colored pixel and a white pixel;
a liquid crystal layer on the array substrate; and
an upper polarizing plate and a lower polarizing plate facing each other with the array substrate interposed therebetween,
wherein a first part of the upper polarizing plate overlapping with the white pixel has a transmission axis in the same direction as a transmission axis of the lower polarizing plate, and a second part of the upper polarizing plate overlapping with the colored pixel has a transmission axis in a direction perpendicular to the transmission axis of the lower polarizing plate, the first and second parts of the upper polarizing plate overlapping with the white pixel and the colored pixel being at a same layer, and
wherein the liquid crystal layer is configured to align liquid crystal molecules overlapping with the first part of the upper polarizing plate to be in the direction perpendicular to the transmission axis of the lower polarizing plate to not permit backlight-emitted light to transmit through the first part of the upper polarizing plate in response to a voltage being applied to the liquid crystal layer, and to realign the liquid crystal molecules to permit backlight-emitted light to transmit through the first part of the upper polarizing plate in response to no voltage being applied to the liquid crystal layer.

19. The LCD device of claim 18 , the array substrate is further configured to maintain an alignment of liquid crystal molecules comprised in the white pixel in the direction perpendicular to the transmission axis of the lower polarizing plate, while the LCD device is displaying an image.

20. The LCD device of claim 18 , wherein the colored pixel and the white pixel are defined by an imaginary line that vertically or horizontally extends ac

Assignees

• Samsung Display Co Ltd

Inventors

• Im Wan Soon
• Roh Nam Seok
• Song Young Goo
• Lee Hyoung Cheol
• Hyung Yong Woo
• Kim Hyung June
• Chong Joong Gun
• Hwang Jong Hak

Classifications

• G02F2201/52

  RGB geometrical arrangements · CPC title

• G02F1/133514 Primary

  Colour filters · CPC title

• G02F1/133528

  Polarisers · CPC title

• G02F2001/133538

  Physics · mapped topic

• G02F1/133538

  with spatial distribution of the polarisation direction · CPC title