Liquid crystal display panel and display apparatus using the same

Patent metadata

Field	Value
Publication number	US-9720276-B2
Application number	US-201514723464-A
Country	US
Kind code	B2
Filing date	May 28, 2015
Priority date	May 24, 2012
Publication date	Aug 1, 2017
Grant date	Aug 1, 2017

Abstract

The present invention provides a liquid crystal display (LCD) panel and a display apparatus using the same. The LCD panel comprises a first substrate, a second substrate, a liquid crystal layer and a half wave (λ/2) retarder film, The liquid crystal layer is formed between the first substrate and the second substrate. The second substrate comprises a second electrode, wherein the second electrode comprises a trunk portion and plurality of branch portions, and there is a predetermined angle between the trunk portion and the branch portions, and the predetermined angle is less than or greater than 45 degrees. The λ/2 retarder film is bonded to an outer surface of the first substrate or the second substrate. The present invention can improve the color shift problem and the transmittance of the LCD panel.

First claim

The invention claimed is:

1. A liquid crystal display panel comprising:
a first substrate comprising a first electrode;
a second substrate comprising a second electrode, wherein the second electrode has a pixel electrode structure, and the pixel electrode structure comprises a trunk portion and plurality of branch portions, and there is a predetermined angle between the trunk portion and the branch portions, and the predetermined angle is in the range of 5 degrees to 85 degrees except 45 degrees;
a liquid crystal layer formed between the first substrate and the second substrate;
a first polarizer disposed at an outer side of the first substrate;
a second polarizer disposed at an outer side of the second substrate; and
a half wave (λ/2) retarder film positioned between the second substrate and the second polarizer;
wherein, when the predetermined angle (θ) is less than 45 degrees, and there is an angle (Ψ 2 ) between a slow axis of the half wave retarder film and an absorption axis of the second polarizer, and the predetermined angle (θ) and the angle (Ψ 2 ) satisfy the following equation:
Ψ 2 +θ=45°;

wherein, when the predetermined angle (θ) is greater than 45 degrees, and there is an angle (Ψ 4 ) between a slow axis of the half wave retarder film and an absorption axis of the second polarizer, and the predetermined angle (θ) and the angle (Ψ 4 ) satisfy the following equation:
θΨ 4 =45°.

2. The liquid crystal display panel according to claim 1 , wherein the predetermined angle is in the range of 5 degrees to 42.5 degrees.

3. The liquid crystal display panel according to claim 1 , wherein the predetermined angle is in the range of 47.5 degrees to 85 degrees.

4. A liquid crystal display panel comprising:
a first substrate comprising a first electrode;
a second substrate comprising a second electrode, wherein the second electrode has a pixel electrode structure, and the pixel electrode structure comprises a trunk portion and plurality of branch portions, and there is a predetermined angle between the trunk portion and the branch portions, and the predetermined angle is less than or greater than 45 degrees;
a liquid crystal layer formed between the first substrate and the second substrate;
a first polarizer disposed at an outer side of the first substrate;
a second polarizer disposed at an outer side of the second substrate; and
a half wave retarder film positioned between the second substrate and the second polarizer;
wherein, when the predetermined angle (θ) is less than 45 degrees, and there is an angle (Ψ 2 ) between a slow axis of the half wave retarder film and an absorption axis of the second polarizer, and the predetermined angle (θ) and the angle (Ψ 2 ) satisfy the following equation:
Ψ 2 +θ=45°;

wherein, when the predetermined angle (θ) is greater than 45 degrees, and there is an angle (Ψ 4 ) between a slow axis of the half wave retarder film and an absorption axis of the second polarizer, and the predetermined angle (θ) and the angle (Ψ 4 ) satisfy the following equation:
θ−Ψ 4 =45°.

5. The liquid crystal display panel according to claim 4 , wherein the predetermined angle is in the range of 5 degrees to 42.5 degrees.

6. The liquid crystal display panel according to claim 4 , wherein the predetermined angle is in the range of 47.5 degrees to 86 degrees.

7. A display apparatus comprising:
a backlight module; and
a liquid crystal display panel comprising:
a first substrate comprising a first electrode;
a second substrate comprising a second electrode, wherein the second electrode has a pixel electrode structure, and the pixel electrode structure comprises a trunk portion and plurality of branch portions, and there is a predetermined angle between the trunk portion and the branch portions, and the predetermined angle is less than or greater than 45 degrees;
a liquid crystal layer formed between the first substrate and the second substrate;
a first polarizer disposed at an outer side of the first substrate;
a second polarizer disposed at an outer side of the second substrate; and
a half wave retarder film positioned between the second substrate and the second polarizer;

wherein, when the predetermined angle (θ) is less than 45 degrees, and there is an angle (Ψ 2 ) between a slow axis of the half wave retarder film and an absorption axis of the second polarizer, and the predetermined angle (θ) and the angle (Ψ 2 ) satisfy the following equation:
Ψ 2 +θ=45°;

wherein, when the predetermined angle (θ) is greater than 45 degrees, and there is an angle (Ψ 4 ) between a slow axis of the half wave retarder film and an absorption axis of the second polarizer, and the predetermined angle (θ) and the angle (Ψ 4 ) satisfy the following equation:
θ−Ψ 4 =45°.

Assignees

• Shenzhen China Star Optoelect
• Shenzhen China Star Optoelect

Inventors

• Kang Chihtsung

Classifications

• G02F1/133528 Primary

  Polarisers · CPC title

• G02F1/133753 Primary

  with different alignment orientations or pretilt angles on a same surface, e.g. for grey scale or improved viewing angle · CPC title

• G02F1/134309

  characterised by their geometrical arrangement · CPC title

• G02F2413/01

  Number of plates being 1 · CPC title

• G02F2001/133638

  Physics · mapped topic