System and method for luminance degradation reduction using consumption rate limits

• US 9,743,492 B2
• Filed: 11/30/2015
• Issued: 08/22/2017
• Est. Priority Date: 11/30/2015
• Status: Active Grant

• Current Assignee: Visteon Global Technologies Incorporated (Visteon Corporation)
• Original Assignee: Visteon Global Technologies Incorporated (Visteon Corporation)
• Inventors: Weindorf, Paul Fredrick Luther
• Primary Examiner(s): VU, JIMMY T
• Application Number:
  US14/954,296
• Publication Number:
  US 20170156191A1
• Time in Patent Office: 631 Days
• Field of Search: 3151691-1693, 315291, 315307, 315308-312
• CPC Class Codes: H05B 45/14 using electrical feedback from LEDs or from LED modules
• CPC Class Codes: H05B 45/60 Circuit arrangements for operating LEDs comprising organic material, e.g. for operating organic light-emitting diodes [OLED] or polymer light-emitting diodes [PLED]
• CPC Class Codes: H05B 47/105 in response to determined parameters
• CPC Class Codes: Y02B 20/30 Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]

Abstract

A system to compensate for luminance degradation of an emissive display is provided. The system employs a combination of a consumption rate limit and temperature to regulate and control display luminance for emissive displays (such as organic light emitting diodes). A consumption rate limit is employed to determine a display luminance ceiling at which to drive the display. By employing the aspects disclosed herein, the display systems may achieve a longer lifetime.

Claims

1. A system to compensate for luminance degradation of a display, the system comprising:

a luminance control system coupled to the display and configured to provide power to the display thereby controlling the display luminance, the luminance control system including an input to receive a consumption rate (CR) limit;

a temperature sensor proximate the display and in electrical communication with a controller,

wherein the luminance control system is configured to vary the display luminance, based on a temperature measured by the temperature sensor and the CR limit.

2. The system according to claim 1, wherein the display luminance is determined by a relationship between the consumption rate, maximum luminance of the display, and temperature of the display.

3. The system according to claim 1, wherein the display luminance is maximized so as to be under CR limit by employing the following relationship:

L_OP=f(CR,K°

)

wherein;

L_op is the display luminance; and

°

K is a temperature in Kelvin of the display.

4. The system according to claim 1, wherein the temperature sensor is a thermistor.

5. The system according to claim 1, wherein the luminance control system retrieves a luminance based on correlating the measured temperature with a value in a predefined lookup table.

6. The system according to claim 2, wherein the luminance control system is implemented with a circuit to perform the relationship.

7. The system according to claim 1, wherein the luminance control system employs a PID control loop.

15. The system according to claim 1, the control system retrieves a luminance based on correlating the measured temperature with a value in a predefined lookup table.

8. A display integrated with a luminance control system, comprising:

a consumption rate (CR) limit;

a temperature sensor proximate the display and in electrical communication with a controller,

wherein;

the luminance control system coupled to the display and configured to provide power to the display thereby controlling the display luminance, and

the luminance control system is configured to vary the display luminance, based on a temperature measured by the temperature sensor and the CR limit.

9. The display according to claim 8, wherein the display luminance is determined by a relationship between the consumption rate, maximum luminance of the display, and temperature of the display.

10. The display according to claim 8, wherein the display luminance is maximized so as to be under CR limit by employing the following relationship:

L_OP=f(CR,K°

)

wherein;

L_op is the display luminance; and

°

K is a temperature in Kelvin of the display.

11. The display according to claim 8, wherein the temperature sensor is a thermistor.

12. The display according to claim 8, wherein the luminance control system retrieves a luminance based on correlating the measured temperature with a value in a predefined lookup table.

13. The display according to claim 8, wherein the luminance control system is implemented with a circuit to perform the relationship.

14. The display according to claim 8, wherein the luminance control system employs a PID control loop.