Low Power Consumption OLED Display

• US 20150349032A1
• Filed: 01/26/2015
• Published: 12/03/2015
• Est. Priority Date: 05/27/2014
• Status: Active Grant

• Current Assignee: Universal Display Corporation
• Original Assignee: Universal Display Corporation
• Inventors: HACK, Michael, BROWN, Julia J., WEAVER, Michael Stuart, SO, Woo-Young
• Granted Patent: US 10,700,134 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H10K 59/12 Active-matrix OLED [AMOLED] displays
• CPC Class Codes: H10K 59/35 comprising red-green-blue [RGB] subpixels
• CPC Class Codes: H10K 59/351 comprising more than three subpixels, e.g. red-green-blue-white [RGBW]
• CPC Class Codes: H10K 59/38 comprising colour filters or colour changing media [CCM]
• CPC Class Codes: H10K 59/60 OLEDs integrated with inorganic light-sensitive elements, e.g. with inorganic solar cells or inorganic photodiodes
• CPC Class Codes: Y02E 10/549 Organic PV cells

Abstract

This disclosure relates to reduced power consumption OLED displays at reduced cost for reduced information content applications, such as wearable displays. Image quality for wearable displays can be different than for high information content smart phone displays and TVs, where the wearable display has an architecture that in includes, for example, an all phosphorescent device and/or material system that may be fabricated at reduced cost. The reduced power consumption can facilitate wireless and solar charging.

Claims

1. A device comprising:

an active-matrix driven display including a plurality of OLED pixels, each OLED pixel comprising;

a first sub-pixel configured to emit light in the light blue range of the visible spectrum,

wherein each pixel comprises no other sub-pixels that emit light in a blue range of the visible spectrum.

2. The device of claim 1, wherein each of the plurality of OLED pixels further comprises a second sub-pixel configured to emit red light and a third sub-pixel configured to emit green light.

3. The device of claim 2, wherein when the device is to provide luminances above a predetermined threshold level, and any increase in luminance uses at least a greater proportion of green light to the light in the light blue range than used for a corresponding luminance increase below the predetermined threshold level.

4. The device of claim 1, wherein the plurality of OLED sub-pixels further comprises a second sub-pixel configured to emit yellow light.

5. The device of claim 4, wherein when the device is to provide luminances above a predetermined threshold level, and any increase in luminance uses at least a greater proportion of yellow light to the light in the light blue range than used for a corresponding luminance increase below the predetermined threshold level.

6. The device of claim 4, further comprising at least one color change layer disposed over the second sub-pixel, the color change layer selected from the group consisting of:

a color filter and a color conversion layer.

7. The device of claim 1, wherein the device comprises a wearable device, a watch, a computer, a health monitor, a head mounted display, virtual reality glasses, smart glasses, or a communication device.

8. The device of claim 1, wherein a selected white point is within a 7-step, 3-step, or 1-step MacAdam ellipse of a Planckian Black Body Locus.

9. The device of claim 1, wherein the plurality of sub-pixels is configured to emit light having a white point color temperature selected from the group consisting of:

less than 3000K, less than 4000K, and 5000K.

12. The device of claim 1, wherein the power consumed by the active-matrix driven display including the plurality of OLED pixels is less than 6 mW/cm² when the display is operated at a luminance of at least 700 cd/m², excluding driving circuity external to the active-matrix display.

13. The device of claim 1, wherein the power consumed by the active-matrix driven display including the plurality of OLED pixels is divided by the luminance in cd/m² is less than 0.08 W/cd, excluding driving circuitry external to the active-matrix display.

14. The device of claim 1, wherein the light emitted in the light blue range has a y-coordinate selected from the group consisting of:

greater than 0.15 in CIE 1931 XYZ color space chromaticity, greater than 0.2 in CIE 1931 XYZ color space chromaticity, greater than 0.25 in CIE 1931 XYZ color space chromaticity, and greater than 0.3 in CIE 1931 XYZ color space chromaticity.

18. The device of claim 1, wherein when the device is to provide luminances above a predetermined threshold level, and any increase in luminance uses at least a greater proportion of red light to the light in the light blue range than used for a corresponding luminance increase below the predetermined threshold level.

19. The device of claim 1, wherein each of the plurality of pixels includes a solar cell configured to power at least a portion of the plurality of OLED pixels of the device.

20. The device of claim 1, further comprising a plurality of solar cells, wherein the area of solar cells is less than 50% of an active area of the active-matrix driven display including the plurality of OLED pixels.

21. The device of claim 1, wherein the active-matrix driven display including the plurality of OLED pixels is disposed adjacent to a plurality of solar cells.

27. The device of claim 1, wherein each of the plurality of OLED pixels further comprises:

a second sub-pixel configured to emit yellow light; and

at least one color filter disposed over the second sub-pixel.

29. The device of claim 1, wherein the active-matrix driven display including the plurality of OLED pixels comprises a three-dimensional (3D) display.

10-11. -11. (canceled)

15-17. -17. (canceled)

22-26. -26. (canceled)

28. (canceled)

30-33. -33. (canceled)

34. A device comprising:

an active-matrix driven display including a plurality of OLED pixels, wherein the power consumed by the display is less than 6 mW/cm² when the display is operated at a luminance of at least 700 cd/m², excluding driving circuity external to the active-matrix display.

35. A device comprising:

an active-matrix driven display including a plurality of OLED pixels, wherein the power consumed by the display is divided by the luminance in cd/m² is less than 0.08 W/cd, excluding driving circuitry external to the active-matrix display.