OLED device with improved power consumption

• US 20070164664A1
• Filed: 01/19/2006
• Published: 07/19/2007
• Est. Priority Date: 01/19/2006
• Status: Active Grant

• Current Assignee: Global OLED Technology LLC (LG Display Co., Ltd.)
• Original Assignee: Eastman Kodak Company
• Inventors: Ludwicki, John, Spindler, Jeffrey, Boroson, Michael
• Granted Patent: US 7,510,454 B2
• Time in Patent Office: Days
• US Class Current: 313/504
• 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 2330/021 Power management, e.g. power saving
• CPC Class Codes: G09G 3/2003 Display of colours specific for liquid crystal displays G09G3/3607
• CPC Class Codes: G09G 3/3208 organic, e.g. using organic light-emitting diodes [OLED]
• CPC Class Codes: H10K 59/351 comprising more than three subpixels, e.g. red-green-blue-white [RGBW]

Abstract

A method for making an OLED device, comprising: providing a plurality of subpixels of different colors, including at least three gamut-defining subpixels, each subpixel requiring an operating voltage which is based on the maximum current density required by that subpixel; selecting the display operating voltage to be equal to or greater than the maximum required subpixel operating voltage; and selecting the area of the subpixels to reduce the maximum required subpixel operating voltage, thereby reducing the display operating voltage so as to reduce power consumption in the device.

Claims

1. A method for making an OLED device, comprising:

(a) providing a plurality of subpixels of different colors, including at least three gamut-defining subpixels, each subpixel requiring an operating voltage which is based on the maximum current density required by that subpixel;

(b) selecting the display operating voltage to be equal to or greater than the maximum required subpixel operating voltage; and

(c) selecting the area of the subpixels to reduce the maximum required subpixel operating voltage, thereby reducing the display operating voltage so as to reduce power consumption in the device.

2. A method for making an OLED device, comprising:

(a) providing a plurality of subpixels of different colors, including at least three gamut-defining subpixels and one within-gamut subpixel, each subpixel requiring an operating voltage which is based on the maximum current density required by that subpixel;

(b) selecting the display operating voltage to be equal to or greater than the maximum required subpixel operating voltage; and

(c) selecting the area of the subpixels to reduce the maximum required subpixel operating voltage, thereby reducing the display operating voltage so as to reduce power consumption in the device.

3. The method of claim 2 wherein the gamut-defining subpixels emit red, green and blue light.

4. The method of claim 3 wherein the within-gamut subpixel emits white light.

5. The method of claim 4 wherein the OLED device is a white-light-emitting OLED device and the gamut-defining subpixels each include a color filter so as to provide the red, green, and blue light.

6. The method of claim 2 wherein the areas of the subpixels are further selected to improve lifetime.

7. The method of claim 6 wherein the gamut-defining subpixels emit red, green and blue light.

8. The method of claim 7 wherein the within-gamut subpixel emits white light.

9. The method of claim 8 wherein the OLED device is a white-light-emitting OLED device and the gamut-defining subpixels each include a color filter so as to provide the red, green, and blue light.

10. An OLED device comprising,

(a) a plurality of gamut-defining subpixels of different colors and at least one within-gamut subpixel;

and

(b) the areas of the gamut-defining subpixels being selected so that they have similar lifetimes, and the within-gamut subpixel having an area selected to reduce the maximum required subpixel operating voltage, thereby reducing the display operating voltage so as to reduce power consumption in the device.

11. The OLED device of claim 10 wherein the gamut-defining subpixels emit red, green and blue light.

12. The OLED device of claim 11 wherein the within-gamut subpixel emits white light.

13. The method of claim 12 wherein the OLED device is a white-light-emitting OLED device and the gamut-defining subpixels each include a color filter so as to provide the red, green, and blue light.