Liquid crystal display

• US 9,298,044 B2
• Filed: 10/08/2010
• Issued: 03/29/2016
• Est. Priority Date: 03/10/2010
• Status: Active Grant

• Current Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Original Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Inventors: Kim, Gwan-Soo, Huh, Chul, Kim, Jin-Seuk, Lee, Sang-Hun, Lee, Yui-Ku
• Primary Examiner(s): NGUYEN, DUNG T
• Application Number:
  US12/900,797
• Publication Number:
  US 20110222014A1
• Time in Patent Office: 1,999 Days
• Field of Search: 349155-156
• US Class Current: 1/1
• CPC Class Codes: G02F 1/133707 Structures for producing distorted electric fields, e.g. bumps, protrusions, recesses, slits in pixel electrodes
• CPC Class Codes: G02F 1/13394 spacers regularly patterned on the cell subtrate, e.g. walls, pillars G02F1/133377 takes precedence
• CPC Class Codes: G02F 1/13396 Spacers having different sizes
• CPC Class Codes: G02F 1/13398 Spacer materials; Spacer properties
• CPC Class Codes: G02F 1/134345 Subdivided pixels, e.g. for grey scale or redundancy
• CPC Class Codes: G02F 1/136222 Colour filters incorporated in the active matrix substrate
• CPC Class Codes: G02F 1/13624 having more than one switching element per pixel
• CPC Class Codes: G09G 2300/0426 Layout of electrodes and connections
• CPC Class Codes: G09G 2300/0447 for multi-domain technique to improve the viewing angle in a liquid crystal display, such as multi-vertical alignment [MVA]
• CPC Class Codes: G09G 3/3659 the addressing of the pixel involving the control of two or more scan electrodes or two or more data electrodes, e.g. pixel voltage dependant on signal of two data electrodes

Abstract

A liquid crystal display includes a first substrate and a second substrate facing each other, a first spacer and a second spacer on the first substrate and have different heights, and a liquid crystal layer between the first substrate and the second substrate and including a plurality of a liquid crystal molecule. The first spacer and the second spacer include a photosensitive material defining a maximum height of a spacer with respect to a predetermined a cross-section width dimension of the spacer, and heights less than the maximum height with respect to cross-section width dimensions larger than the predetermined cross-section width dimension. The first spacer and the second spacer can include a black pigment.

Claims

1. A method of forming a liquid crystal display, the method including:

disposing a first substrate and a second substrate facing each other;

forming each of a first spacer and a second spacer on the first substrate and from a photosensitive material to have different heights; and

disposing a liquid crystal layer between the first and second substrates;

wherein for predetermined cross-section widths of the first and second spacers, the forming the first and second spacers from the photosensitive material to have the different heights comprises;

forming a layer of the photosensitive material to include photosensitive material layer portions having the predetermined cross-section widths on the first substrate; and

exposing the photosensitive material layer portions having the predetermined cross-section widths to a single amount of light,

wherein when the predetermined cross-section widths of the first and second spacers are different, the exposing the photosensitive material layer portions having the predetermined cross-section widths to the same single amount of light forms the different height first and second spacers.

2. A liquid crystal display formed by the method of claim 1, and comprising:

the first substrate and the second substrate facing each other;

the first spacer and the second spacer on the first substrate, and having the different heights; and

the liquid crystal layer between the first substrate and the second substrate, and including a plurality of a liquid crystal molecule.

3. The liquid crystal display of claim 2, wherein:

the first spacer and the second spacer include a black pigment.

4. The liquid crystal display of claim 3, wherein:

a difference between the heights of the first spacer and the second spacer is about 0.4 micrometer or more.

5. The liquid crystal display of claim 4, further comprising:

a light blocking member on the first substrate,

wherein the first spacer and the second spacer include a same material as the light blocking member.

6. The liquid crystal display of claim 5, wherein:

the spacer which has a larger height of the first spacer and the second spacer, has a cross-section width dimension of about 30 micrometers to about 35 micrometers.

7. The liquid crystal display of claim 6, further comprising:

a third spacer on the first substrate and having a height which is different from the height of the first spacer and the second spacer,

wherein the third spacer includes the photosensitive material.

8. The liquid crystal display of claim 7, wherein:

the photosensitive material has a positive photosensitivity.

9. The liquid crystal display of claim 2, wherein:

a difference between the heights of the first spacer and the second spacer is about 0.4 micrometer or more.

10. The liquid crystal display of claim 9, further comprising:

a light blocking member on the first substrate,

wherein the first spacer and the second spacer include a same material as the light blocking member.

11. The liquid crystal display of claim 10, wherein:

the spacer which has a larger height of the first spacer and the second spacer, has a cross-section width dimension of about 30 micrometers to about 35 micrometers.

12. The liquid crystal display of claim 11, further comprising:

a third spacer on the first substrate and having a height which is different from the height of the first spacer and the second spacer,

wherein the third spacer includes the photosensitive material.

13. The liquid crystal display of claim 12, wherein:

the photosensitive material has a positive photosensitivity.

14. The liquid crystal display of claim 9, wherein:

the spacer which has a larger height of the first spacer and the second spacer, has a cross-section width dimension of about 30 micrometers to about 35 micrometers.

15. The liquid crystal display of claim 14, further comprising:

a third spacer on the first substrate and having a height which is different from the height of the first spacer and the second spacer,

wherein the third spacer includes the photosensitive material.

16. The liquid crystal display of claim 15, wherein:

the photosensitive material has a positive photosensitivity.

17. The liquid crystal display of claim 2, wherein:

a difference between the heights of the first spacer and the second spacer is about 0.4 micrometer or more.

18. The liquid crystal display of claim 17, wherein:

the spacer which has a larger height of the first spacer and the second spacer, has a cross-section width dimension of about 30 micrometers to about 35 micrometers.

19. The liquid crystal display of claim 18, further comprising:

a third spacer on the first substrate and having a height which is different from the height of the first spacer and the second spacer,

wherein the third spacer includes the photosensitive material.

20. The liquid crystal display of claim 19, wherein:

the photosensitive material has a positive photosensitivity.

21. The liquid crystal display of claim 2, further comprising:

a light blocking member on the first substrate,

wherein the first spacer and the second spacer include a same material as the light blocking member.

22. The liquid crystal display of claim 21, wherein:

the spacer which has a larger height of the first spacer and the second spacer, has a cross-section width dimension of about 30 micrometers to about 35 micrometers.

23. The liquid crystal display of claim 22, further comprising:

a third spacer on the first substrate and having a height which is different from the height of the first spacer and the second spacer,

wherein the third spacer includes the photosensitive material.

24. The liquid crystal display of claim 22, wherein:

the photosensitive material has a positive photosensitivity.

25. The liquid crystal display of claim 2, further comprising:

a third spacer on the first substrate and having a height which is different from the height of the first spacer and the second spacer,

wherein the third spacer includes the photosensitive material.

26. The liquid crystal display of claim 25, wherein:

the photosensitive material has a positive photosensitivity.

27. The liquid crystal display of claim 2, wherein:

the photosensitive material has a positive photosensitivity.

28. The method of claim 1, wherein when the predetermined cross-section widths of the first and second spacers are the same, the exposing the photosensitive material layer portions having the predetermined cross-section widths to single amounts of light different from each other forms the different height first and second spacers.

29. The method of claim 1, wherein the forming the first and second spacers having different heights further comprises using a same mask.