Color OLED display having repeated patterns of colored light emitting elements

• US 6,867,549 B2
• Filed: 12/10/2002
• Issued: 03/15/2005
• Est. Priority Date: 12/10/2002
• Status: Expired due to Term

• Current Assignee: Global OLED Technology LLC (LG Display Co., Ltd.)
• Original Assignee: Eastman Kodak Company
• Inventors: Miller, Michael E., Cok, Ronald S., Arnold, Andrew D.
• Primary Examiner(s): TRAN, THUY V
• Application Number:
  US10/315,622
• Publication Number:
  US 20040108818A1
• Time in Patent Office: 826 Days
• Field of Search: 315/169.3, 345/45, 345/55, 345/76, 345/589
• US Class Current: 315/169.3
• CPC Class Codes: G09G 2300/0452 Details of colour pixel setup, e.g. pixel composed of a red, a blue and two green components
• CPC Class Codes: G09G 2320/043 Preventing or counteracting the effects of ageing
• CPC Class Codes: G09G 3/3216 using a passive matrix
• CPC Class Codes: G09G 3/3225 using an active matrix
• CPC Class Codes: H10K 59/35 comprising red-green-blue [RGB] subpixels

Abstract

An OLED display device for displaying a color image includes an array of different colored independently controllable light emitting elements arranged in repeated patterns, a number of light emitting elements of at least one color in each pattern being different than a number of light emitting elements of a different color and the different number of light emitting elements of the different colors being a function of a relative human visual frequency response to the colors, and a relative size of light emitting elements of different colors being a function of a lifetime of the light emitting elements, an efficiency of the light emitting elements, and the number of light emitting elements of the different colors in the pattern, wherein at least one of the lifetime, and the efficiency is different for different colors.

Claims

1. An OLED display device for displaying a color image, comprising an array of different colored independently controllable light emitting elements arranged in repeated patterns, a number of light emitting elements of at least one color in each pattern being different from a number of light emitting elements of a different color and the different number of light emitting elements of the different colors being a function of a relative human visual frequency response to the colors, and a relative size of light emitting elements of different colors being a function of a lifetime of the light emitting elements, an efficiency of the light emitting elements, and the number of light emitting elements of the different colors in the pattern, wherein at least one of the lifetime, and the efficiency is different for different colors such that the relative size of the light emitting elements of different colors is determined in relationship to a proportional factor A/(E.F) wherein A represents a relative rate of aging, E represents a relative amount of light produced at a given power, and F represents a relative number of the light emitting elements in each pattern.

2. The OLED display device claimed in claim 1, wherein the size of a light emitting element is a further function of a relative contribution of the color of the light emitting element to a desired white point of the display.

3. The OLED display device claimed in claim 1, wherein the repeated patterns are aligned with each other.

4. The OLED display device claimed in claim 1, wherein the repeated patterns are offset with respect to each other.

5. The OLED display device claimed in claim 1, wherein the patterns include red, green, and blue light emitting elements and there are more green light emitting elements than red or blue light emitting elements.

6. The OLED display device claimed in claim 5, wherein the blue light emitting elements are largest.

7. The OLED display device claimed in claim 5, wherein the red light emitting elements are smaller than each of the green and blue elements.

8. The OLED display device claimed in claim 5, wherein the green light emitting elements are smaller than each of the red and blue elements.

9. The OLED display device claimed in claim 1, wherein the patterns include four light emitting elements in a series having, in order, a first color light emitting element, a second color light emitting element, another first color light emitting element, and a third color light emitting element.

10. The OLED display device claimed in claim 9, wherein the first color is green, the second color is red and the third color is blue.

11. The OLED display device claimed in claim 10, wherein the blue light emitting element is largest.

12. The OLED display device claimed in claim 10, wherein the green light emitting element is smallest

13. The OLED display device claimed in claim 1, wherein the patterns include four elements that define a rectangular pattern, two first color light emitting elements being located at opposite corners of the rectangular pattern and second and third color light emitting elements being located at the remaining two corners of the rectangular pattern.

14. The OLED display device claimed in claim 13, wherein the first color is green, the second color is red and the third color is blue.

15. The OLED display device claimed in claim 14, wherein the blue light emitting element is largest.

16. The OLED display device claimed in claim 14, wherein the red light emitting element is smallest.

17. The OLED display device claimed in claim 1, wherein the patterns include five light emitting elements that define a rectangular pattern, two first color light emitting elements being located at two diagonally opposite corners of the rectangular pattern, two second color light emitting elements being located at the other two corners, and a third color light emitting element being located in the middle of the rectangular pattern.

18. The OLED display device claimed in claim 17, wherein the first color is green, the second color is red and the third color is blue.

19. The OLED display device claimed in claim 18, wherein the blue light emitting element is largest.

20. The OLED display device claimed in claim 18, wherein the red light emitting element is smaller than each of the green and blue elements.

21. The OLED display device claimed in claim 17, wherein the first color light emitting elements and the second color light emitting elements are L-shaped elements and the third color light emitting element is a rectangular element.

22. The OLED display device claimed in claim 17, wherein the first color light emitting elements and the second color light emitting elements are triangular-shaped elements and the third color light emitting element is a rectangular element.

23. The OLED display device claimed in claim 1, wherein the patterns include seven rectangular light emitting elements that define a rectangular pattern, four first color light emitting elements being located at four corners of the rectangular pattern, two second color light emitting elements being located in the middle of opposite sides of the rectangular pattern, a third color light emitting element being arranged in the middle of the rectangular pattern.

24. The OLED display device claimed in claim 1, wherein the light emitting elements comprise a white light emitting OLED material and a color filter.

25. The OLED display device claimed in claim 1, wherein the size of a light emitting element is a further function of a predetermined relative usage of a color in the display.