SYSTEMS AND METHODS OF DISPLAY BRIGHTNESS ADJUSTMENT

• US 20160293102A1
• Filed: 03/31/2016
• Published: 10/06/2016
• Est. Priority Date: 04/01/2015
• Status: Active Grant

• Current Assignee: IGNIS Innovation Incorporated
• Original Assignee: IGNIS Innovation Incorporated
• Inventors: Chaji, Gholamreza
• Granted Patent: US 10,152,915 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: G09G 2320/0233 Improving the luminance or brightness uniformity across the screen
• CPC Class Codes: G09G 2320/041 Temperature compensation
• CPC Class Codes: G09G 2320/043 Preventing or counteracting the effects of ageing
• CPC Class Codes: G09G 2320/046 Dealing with screen burn-in prevention or compensation of the effects thereof
• CPC Class Codes: G09G 2320/0626 for control of overall brightness
• CPC Class Codes: G09G 2330/045 Protection against panel overheating
• 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 3/32 semiconductive, e.g. using light-emitting diodes [LED]
• CPC Class Codes: G09G 3/3208 organic, e.g. using organic light-emitting diodes [OLED]
• CPC Class Codes: G09G 3/3225 using an active matrix

Abstract

Systems and methods for adjusting a brightness of a display panel by periodically measuring at least one physical property in at least one area of a display panel, generating measurement data, and adjusting the brightness of the display panel with use of the measurement data. The brightness can be adjusted to control temperature and aging, in response to measurements of physical properties measured in at least one area of the display panel.

Claims

1. A method of adjusting a brightness of an emissive display system:

periodically measuring at least one physical property in at least one area of a display panel generating measurement data; and

adjusting the brightness of the display panel with use of the measurement data.

2. The method of claim 1, wherein the measurement data comprises measurements of each at least one physical property, the method further comprising:

comparing each measurement of each at least one physical property with at least one threshold generating a respective at least one comparison,

wherein adjusting the brightness of the display panel is performed with use of the at least one comparison.

3. The method of claim 1 further comprising:

predicting the future state of at least one physical property with use of the measurement data generating at least one predicted physical property value; and

comparing the at least one predicted physical property value with at least one threshold generating a respective at least one comparison,

wherein adjusting the brightness of the display panel is performed with use of the at least one comparison.

4. The method of claim 2, wherein adjusting the brightness of the display panel comprises determining a target brightness for the display panel with use of the measurement data, wherein the target brightness falls within at least one acceptable range of brightness.

5. The method of claim 3, wherein adjusting the brightness of the display panel comprises determining a target brightness for the display panel with use of the measurement data, wherein the target brightness falls within at least one acceptable range of brightness.

6. The method of claim 4, wherein the at least one physical property comprises a rate of temperature change and the at least one threshold comprises a first threshold rate of temperature change and a second threshold rate of temperature change, wherein adjusting the brightness of the display panel comprises:

determining the target brightness to be lower than a current brightness when the at least one comparison indicates that the rate of temperature change is greater than the first threshold rate of temperature change and when the current brightness is greater than a minimum acceptable brightness of said at least one acceptable range of brightness; and

determining the target brightness to be higher than the current brightness when the at least one comparison indicates that the rate of temperature change is less than the second threshold rate of temperature change, and when the current brightness is less than a maximum acceptable brightness of said at least one acceptable range of brightness.

7. The method of claim 4, wherein the least one physical property comprises a temperature and the at least one threshold comprises a first threshold temperature and a second threshold temperature, wherein adjusting the brightness of the display panel comprises:

determining the target brightness to be lower than a current brightness when the at least one comparison indicates that the temperature is greater than the first threshold temperature and when the current brightness is greater than a minimum acceptable brightness of said at least one acceptable range of brightness; and

determining the target brightness to be higher than the current brightness when the at least one comparison indicates that the temperature is less than the second threshold temperature, and when the current brightness is less than a maximum acceptable brightness of said at least one acceptable range of brightness.

8. The method of claim 4, wherein the at least one physical property comprises a rate of temperature change and a temperature and the at least one threshold comprises a threshold rate of temperature change a threshold temperature, wherein adjusting the brightness of the display panel comprises:

determining the target brightness to be lower than a current brightness when the at least one comparison indicates that the rate of temperature change is greater than the threshold rate of temperature change and the temperature is greater than the threshold temperature and when the current brightness is greater than a minimum acceptable brightness of said at least one acceptable range of brightness; and

determining the target brightness to be higher than the current brightness when the at least one comparison indicates that at least one of the rate of temperature change is not greater than the threshold rate of temperature change and the temperature is not greater than the threshold temperature, and when the current brightness is less than a maximum acceptable brightness of said at least one acceptable range of brightness.

9. The method of claim 5, wherein the at least one physical property comprises a rate of temperature change and a temperature, the at least one predicted physical property value comprises a predicted temperature value, and the at least one threshold comprises a first threshold temperature and a second threshold temperature, wherein adjusting the brightness of the display panel comprises:

determining the target brightness to be lower than a current brightness when the at least one comparison indicates that the predicted temperature value is greater than the first threshold temperature and when the current brightness is greater than a minimum acceptable brightness of said at least one acceptable range of brightness; and

determining the target brightness to be higher than the current brightness when the at least one comparison indicates that the predicted temperature value is less than the second threshold temperature, and when the current brightness is less than a maximum acceptable brightness of said at least one acceptable range of brightness.

10. The method of claim 4, wherein the at least one physical property comprises a rate of aging and the at least one threshold comprises a first threshold rate of aging and a second threshold rate of aging, wherein adjusting the brightness of the display panel comprises:

determining the target brightness to be lower than a current brightness when the at least one comparison indicates that the rate of aging is greater than the first threshold rate of aging and when the current brightness is greater than a minimum acceptable brightness of said at least one acceptable range of brightness; and

determining the target brightness to be higher than the current brightness when the at least one comparison indicates that the rate of aging is less than the second threshold rate of aging, and when the current brightness is less than a maximum acceptable brightness of said at least one acceptable range of brightness.

11. The method of claim 4, wherein the at least one physical property comprises aging and the at least one threshold comprises a first threshold aging and a second threshold aging, wherein adjusting the brightness of the display panel comprises:

determining the target brightness to be lower than a current brightness when the at least one comparison indicates that the aging is greater than the first threshold aging and when the current brightness is greater than a minimum acceptable brightness of said at least one acceptable range of brightness; and

determining the target brightness to be higher than the current brightness when the at least one comparison indicates that the aging is greater than the second threshold aging, and when the current brightness is less than a maximum acceptable brightness of said at least one acceptable range of brightness.

12. The method of claim 4, wherein the at least one physical property comprises aging and a rate of aging the at least one threshold comprises a plurality of aging thresholds and a corresponding plurality of threshold aging rates, wherein adjusting the brightness of the display panel comprises:

determining the target brightness when the at least one comparison indicates that the aging is greater than the one of the plurality of aging threshold and the rate of aging is greater than the corresponding one of the plurality of threshold aging rates.

13. A display system comprising:

a display panel having an array of pixels that each include a drive transistor and a light emitting device, multiple select lines coupled to said array for delivering signals that select when each pixel is to be driven, multiple data lines for delivering drive signals to the selected pixels, and multiple monitor lines for conveying signals from each pixel; and

a monitor system for periodically measuring at least one physical property in at least one area of the display with use of signals over the monitor lines to pixels of the at least one area generating measurement data;

a memory store for storing the measurement data; and

a controller adapted to adjust the brightness of the display panel with use of the measurement data.

14. The display system of claim 13, wherein the measurement data comprises measurements of each at least one physical property, the controller further adapted to:

compare each measurement of each at least one physical property with at least one threshold generating a respective at least one comparison,

wherein the controller is adapted to adjust the brightness of the display panel with use of the at least one comparison.

15. The display system of claim 13, wherein the controller is further adapted to:

predict the future state of at least one physical property with use of the measurement data generating at least one predicted physical property value; and

compare the at least one predicted physical property value with at least one threshold generating a respective at least one comparison,

wherein the controller is adapted to adjust the brightness of the display panel with use of the at least one comparison.

16. The display system of claim 14, wherein the controller is adapted to adjust the brightness of the display panel by determining a target brightness for the display panel with use of the measurement data, wherein the target brightness falls within at least one acceptable range of brightness.

17. The display system of claim 15, wherein the controller is adapted to adjust the brightness of the display panel by determining a target brightness for the display panel with use of the measurement data, wherein the target brightness falls within at least one acceptable range of brightness.

18. The display system of claim 16, wherein the at least one physical property comprises a rate of temperature change and the at least one threshold comprises a first threshold rate of temperature change and a second threshold rate of temperature change, wherein the controller is adapted to adjust the brightness of the display panel by:

determining the target brightness to be lower than a current brightness when the at least one comparison indicates that the rate of temperature change is greater than the first threshold rate of temperature change and when the current brightness is greater than a minimum acceptable brightness of said at least one acceptable range of brightness; and

determining the target brightness to be higher than the current brightness when the at least one comparison indicates that the rate of temperature change is greater than the second threshold rate of temperature change, and when the current brightness is less than a maximum acceptable brightness of said at least one acceptable range of brightness.

19. The display system of claim 16, wherein the at least one physical property comprises a temperature and the at least one threshold comprises a first threshold temperature and a second threshold temperature, wherein the controller is adapted to adjust the brightness of the display panel by:

determining the target brightness to be lower than a current brightness when the at least one comparison indicates that the temperature is greater than the first threshold temperature and when the current brightness is greater than a minimum acceptable brightness of said at least one acceptable range of brightness; and

determining the target brightness to be higher than the current brightness when the at least one comparison indicates that the temperature is greater than the second threshold temperature, and when the current brightness is less than a maximum acceptable brightness of said at least one acceptable range of brightness.

20. The display system of claim 16, wherein the at least one physical property comprises a rate of temperature change and a temperature and the at least one threshold comprises a threshold rate of temperature change a threshold temperature, wherein the controller is adapted to adjust the brightness of the display panel by:

determining the target brightness to be lower than a current brightness when the at least one comparison indicates that the rate of temperature change is greater than the threshold rate of temperature change and the temperature is greater than the first threshold temperature and when the current brightness is greater than a minimum acceptable brightness of said at least one acceptable range of brightness; and

determining the target brightness to be higher than the current brightness when the at least one comparison indicates that at least one of the rate of temperature change is not greater than the threshold rate of temperature change and the temperature is not greater than the second threshold temperature, and when the current brightness is less than a maximum acceptable brightness of said at least one acceptable range of brightness.

21. The display system of claim 17, wherein the at least one physical property comprises a rate of temperature change and a temperature, the at least one predicted physical property value comprises a predicted temperature value, and the at least one threshold comprises a first threshold temperature and a second threshold temperature, wherein the controller is adapted to adjust the brightness of the display panel by:

determining the target brightness to be lower than a current brightness when the at least one comparison indicates that the predicted temperature value is greater than the first threshold temperature and when the current brightness is greater than a minimum acceptable brightness of said at least one acceptable range of brightness; and

determining the target brightness to be higher than the current brightness when the at least one comparison indicates that the predicted temperature value is not greater than the second threshold temperature, and when the current brightness is less than a maximum acceptable brightness of said at least one acceptable range of brightness.

22. The display system of claim 16, wherein the at least one physical property comprises a rate of aging and the at least one threshold comprises a first threshold rate of aging and a second threshold rate of aging, wherein the controller is adapted to adjust the brightness of the display panel by:

determining the target brightness to be lower than a current brightness when the at least one comparison indicates that the rate of aging is greater than the first threshold rate of aging and when the current brightness is greater than a minimum acceptable brightness of said at least one acceptable range of brightness; and

determining the target brightness to be higher than the current brightness when the at least one comparison indicates that the rate of aging is greater than the second threshold rate of aging, and when the current brightness is less than a maximum acceptable brightness of said at least one acceptable range of brightness.

23. The display system of claim 16, wherein the at least one physical property comprises aging and the at least one threshold comprises a first threshold aging and a second threshold aging, wherein the controller is adapted to adjust the brightness of the display panel by:

determining the target brightness to be lower than a current brightness when the at least one comparison indicates that the aging is greater than the first threshold aging and when the current brightness is greater than a minimum acceptable brightness of said at least one acceptable range of brightness; and

determining the target brightness to be higher than the current brightness when the at least one comparison indicates that the aging is greater than the second threshold aging, and when the current brightness is less than a maximum acceptable brightness of said at least one acceptable range of brightness.

24. The display system of claim 16, wherein the at least one physical property comprises aging and a rate of aging the at least one threshold comprises a plurality of aging thresholds and a corresponding plurality of threshold aging rates, wherein the controller is adapted to adjust the brightness of the display panel by determining the target brightness when the at least one comparison indicates that the aging is greater than the one of the plurality of aging threshold and the rate of aging is greater than the corresponding one of the plurality of threshold aging rates.