Display panel having a color filter and a protective layer of heat melted material and method of manufacturing the display panel

• US 7,014,521 B1
• Filed: 08/03/2000
• Issued: 03/21/2006
• Est. Priority Date: 08/05/1999
• Status: Expired due to Fees

• Current Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Original Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Inventors: Iwata, Kenichi, Fujiike, Hiroshi, Sato, Hiroshi, Kashiwazaki, Akio, Nishi, Akio
• Primary Examiner(s): Williams, Joseph
• Application Number:
  US09/631,951
• Time in Patent Office: 2,056 Days
• Field of Search: 445/24, 427/165, 427/168, 347/19
• US Class Current: 445/24
• CPC Class Codes: B41J 2202/09 Ink jet technology used for manufacturing optical filters
• CPC Class Codes: B41M 3/003 on optical devices, e.g. lens elements; for the production of optical devices production by thermal imaging means B41M5/265
• CPC Class Codes: G02B 5/201 in the form of arrays

Abstract

A display apparatus includes a color filter with a color portion formed in at least one recess portion surrounded by partition walls on a substrate and a protective layer formed on the color portion and the partition walls. A thickness of the color portion is 20% to 80% of a thickness of the partition walls, and a thickness of a first protective layer formed on the partition walls is smaller than a thickness of a second protective layer formed on the color portion. In addition, a counter substrate faces the color filter, a liquid crystal layer exists between the color filter and the counter substrate, and a spacer is arranged on the first protective layer formed on the partition walls.

Claims

1. A display panel comprising:

a color filter having a color portion formed in at least one recess portion surrounded by partition walls on a substrate and protective layers formed on said color portion and said partition walls, wherein a thickness of said color portion is 20% to 80% of a thickness of said partition walls, and a thickness of a protective layer formed on said partition walls is smaller than a thickness of a protective layer formed on said color portion;

a counter substrate which faces said color filter; and

a liquid crystal layer disposed between said color filter and said counter substrate,

wherein the protective layers are formed of a heat-melted material.

2. A display panel according to claim 1, further comprising a spacer is arranged on said protective layer formed on said partition walls and on said protective layer formed on said color portion.

3. A display panel according to claim 1, wherein the thickness of said color portion is 40% to 60% of the thickness of said partition walls.

4. A display panel according to claim 1, wherein the thickness of said color portion is about 50% of the thickness of said partition walls.

5. A display panel according to claim 1, wherein an average value of the thickness of said partition wall is larger than 1 μ

m.

6. A display panel according to claim 1, wherein an average value of the thickness of said partition wall is 2 μ

m to 3 μ

m.

7. A display panel according to claim 1, wherein an average value of the thickness of said color portion is larger than 0.6 μ

m.

8. A display panel according to claim 1, wherein the thickness of said protective layer formed on said partition walls is equal to or greater than 0.1 μ

m and less than 0.5 μ

m, and the thickness of said protective layer formed on said color portion is equal to or more than 0.5 μ

m and less than 3 μ

m.

9. A display panel according to claim 1, wherein said partition walls are black matrixes that shade light.

10. A display panel, comprising:

a display portion formed in at least one recess portion surrounded by partition walls on a substrate, said display portion having a thickness smaller than a thickness of said partition walls; and

protective layers formed on said display portion and said partition walls,

wherein a thickness of a protective layer formed on said partition walls is smaller than a thickness of a protective layer formed on said display portion, and wherein the protective layers are formed of a heat-melted material.

11. A display panel according to claim 10, wherein said display panel is an electroluminescence element and said display portion is a light-emitting portion.

12. A display panel according to claim 10, wherein said display panel includes a color filter and said display portion is a color portion.

13. A method of manufacturing a display panel comprising the steps of:

providing a color filter which has a color portion formed in at least one recess portion surrounded by partition walls on a substrate and protective layers formed on the color portion and the partition walls, wherein a thickness of the color portion is 20% to 80% of a thickness of the partition walls, and a thickness of a protective layer formed on the partition walls is smaller than a thickness of a protective layer formed on the color portion;

providing a counter substrate which faces the color filter; and

disposing a liquid crystal layer between the color filter and the counter substrate,

wherein the protective layers are formed of a heat-melted material.

14. A method according to claim 13, further comprising the step of arranging the spacer on the protective layer formed on the partition walls and also on the protective layer formed on the color portion.

15. A method according to claim 13, further comprising the step of determining an amount of an ink to be injected into one recess portion for forming the color portion, said determining step comprising:

(A) a first step of measuring at least a first average thickness of the color portion formed by injecting a first amount of ink to a first recess portion and a second average thickness of the color portion formed by injecting a second amount of ink to a second recess portion;

(B) a second step of generating data representing a relationship between an average thickness of the color portion and ink amount based on at least first and second average thicknesses and corresponding ink amounts; and

(C) a third step of determining an ink amount to be injected into the one recess portion based on the data so that the average thickness of the color portion becomes 20% to 80% of the thickness of the partition walls.

16. A method according to claim 13, further comprising the step of determining an amount of ink to be injected into one recess portion for forming the color portion, said determining step comprising:

(A) a first step of measuring an average thickness of the color portion formed by injecting a predetermined amount of ink into a first recess portion;

(B) a second step of generating data representing a relationship between an average thickness of the color portion and ink amount based on the average thickness and corresponding ink amount; and

(C) a third step of determining an ink amount to be injected into the one recess portion based on the data so that the average thickness of the color portion becomes 20% to 80% of the thickness of the partition walls.

17. A method according to claim 13, further comprising the step of inspecting whether or not the average thickness of the color portion is 20% to 80% of the thickness of the partition walls.

18. A method according to claim 17, wherein said inspecting step is performed every time a predetermined number of color filters are manufactured.

19. A method according to claim 17, wherein the average thickness of at least one color portion is inspected in said inspecting step.

20. A method according to claim 17, further comprising the step of adjusting the ink amount so that the average thickness of the color portion becomes 20% to 80% of the thickness of the partition walls in the case that the average thickness of the color portion is judged as not to be 20% to 80% of the thickness of the partition walls in said inspecting step.

21. A method according to claim 13, wherein the color portion is formed by injecting ink into the recess portion, and the injecting operation is performed by an ink-jet head.

22. A method of manufacturing a color filter comprising the steps of:

forming a color portion by injecting ink into at least one recess portion surrounded by partition walls on a substrate so that a thickness of the color portion becomes 20% to 80% of a thickness of the partition walls; and

forming protective layers on the color portion and the partition walls so that a thickness of a first protective layer formed on the partition walls becomes smaller than a thickness of a second protective layer formed on the color portion,

wherein the protective layers are formed of a heat-melted material.

23. A color filter having colored portions formed by filling at least one recess portion surrounded by partition walls on a substrate with ink, comprising:

a colored portion formed in the recess portion, with a mean distance from a bottom surface to a top surface of said colored portion being 20% to 80% of a distance from a bottom portion to a top portion of the partition wall; and

a protective portion formed on the top surface of said colored portion and the top portion of the partition wall,

wherein a distance from a bottom surface to a top surface of said protective portion formed on the top portion of the partition wall is smaller than a distance from a bottom surface to a top surface of said protective portion formed on the top surface of said colored portion, and

said protective portion is formed of a heat-melted material.