ELECTRONIC DISPLAY HAVING IMPROVED UNIFORMITY

• US 20080158107A1
• Filed: 12/27/2006
• Published: 07/03/2008
• Est. Priority Date: 12/27/2006
• Status: Active Grant

• Current Assignee: Global OLED Technology LLC (LG Display Co., Ltd.)
• Original Assignee: Global OLED Technology LLC (LG Display Co., Ltd.)
• Inventors: Miller, Michael E., Murdoch, Michael J., Kane, Paul J.
• Granted Patent: US 8,013,817 B2
• Time in Patent Office: Days
• US Class Current: 345/76
• 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 2320/0233 Improving the luminance or brightness uniformity across the screen
• CPC Class Codes: G09G 2320/0242 Compensation of deficiencies in the appearance of colours
• CPC Class Codes: G09G 3/20 for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
• CPC Class Codes: G09G 3/22 using controlled light sources
• CPC Class Codes: G09G 3/3208 organic, e.g. using organic light-emitting diodes [OLED]

Abstract

A display with improved visual uniformity, comprised of an array of independently-addressable light-emitting elements, including at least a first independently-addressable light-emitting element for producing a first color of light and a second independently-addressable light-emitting element for producing a second color of light; wherein at least the first independently-addressable light-emitting element is subdivided into at least two spatially separated commonly-addressed light-emitting areas and wherein at least a portion of the second independently-addressable light-emitting element is positioned between the spatially separated commonly-addressed light-emitting areas of the first independently-addressable light-emitting element.

Claims

1. A display with improved visual uniformity, comprised of an array of independently-addressable light-emitting elements, including at least a first independently-addressable light-emitting element for producing a first color of light and a second independently-addressable light-emitting element for producing a second color of light;

wherein at least the first independently-addressable light-emitting element is subdivided into at least two spatially separated commonly-addressed light-emitting areas and wherein at least a portion of the second independently-addressable light-emitting element is positioned between the spatially separated commonly-addressed light-emitting areas of the first independently-addressable light-emitting element.

2. The display of claim 1, wherein the display is an electro-luminescent display.

3. The display of claim 1, wherein the display is comprised of an array of light-emitting elements for emitting at least three different colors of light.

4. The display of claim 3, wherein the light-emitting elements produce at least red, green and blue colors of light.

5. The display of claim 4, wherein the array of light-emitting elements include at least one light-emitting element for emitting a color that is inside the color gamut defined by the chromaticity coordinates of the red, green, and blue colors of light.

6. The display of claim 1, wherein each of the first and second independently-addressable light-emitting elements for emitting different colors of light are subdivided into at least two spatially separated commonly-addressed light-emitting areas.

7. The display of claim 1, wherein the at least first light-emitting element emits a color of light having relatively lower luminance than at least one other light-emitting element of the display.

8. The display of claim 1, wherein the at least first light-emitting element emits a color of light having relatively higher luminance than at least one other light-emitting element of the display.

9. The display of claim 1, wherein the display has different numbers of independently addressable light-emitting elements for emitting different colors of light, and wherein the number of individually-addressable light-emitting elements for emitting the first color of light are fewer in number than the number of individually-addressable light-emitting elements for emitting at least one other color of light.

10. The display of claim 1, wherein the addressability of the display is less than 300 pixels per inch

11. The display of claim 10, wherein the addressability of the display is less than 200 pixels per inch.

12. The display of claim 1, wherein each of the spatially separated commonly-addressed light-emitting areas of the at least first light-emitting element are of substantially the same area.

13. The display of claim 1, wherein the at least first independently-addressable light-emitting element is comprised of:

a) a pair of electrodes, at least one of which is patterned to form electrode segments which spatially define the spatially separated light-emitting areas of the light-emitting elements; and

b) a medium that is in electrical contact with the pair of electrodes and that is stimulated to produce or modulate light;

wherein the electrode segments are electrically connected to each other.

14. The display of claim 13, wherein the display is an active-matrix display further comprised of circuits for providing control signals to each independently addressable light-emitting element, wherein the spatially separated light-emitting areas of the at least first independently addressable light-emitting element are actively controlled by the same circuit.

15. The display of claim 14, wherein the display is an electro-luminescent display employing a top emitting architecture.

16. The display of claim 14, wherein the electrode segments are electrically connected to each other by a connection formed between the electrode segments in the same plane as the electrode segments.

17. The display of claim 13, wherein the display is a passive matrix.

18. The display of claim 13, wherein the independently-addressable light-emitting elements are further comprised of color filters or color change materials that are placed in alignment with the individual electrode segments, said color filters or color change materials being similarly segmented to said electrode segments.

19. The display of claim 13, wherein the segmented electrodes each stimulate a medium specific to the desired color of light emission at said segmented electrode site, said medium being similarly segmented to said electrode segments.

20. The display of claim 1, wherein the spatially separated commonly-addressed light emitting areas of at least one independently-addressable light emitting element lie substantially along a first dimension, and the spatially separated commonly-addressed light emitting areas of at least one other independently-addressable light emitting element lie substantially along a second dimension of the display.