Method and device for controlling power of active matrix organic light-emitting diode

• US 9,514,675 B2
• Filed: 05/16/2014
• Issued: 12/06/2016
• Est. Priority Date: 12/30/2008
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Kim, Jong Hwan
• Primary Examiner(s): SIMPSON, LIXI CHOW
• Application Number:
  US14/279,813
• Publication Number:
  US 20140247294A1
• Time in Patent Office: 935 Days
• US Class Current: 1/1
• CPC Class Codes: G09G 2320/0646 Modulation of illumination source brightness and image signal correlated to each other
• CPC Class Codes: G09G 2320/103 Detection of image changes, e.g. determination of an index representative of the image change
• CPC Class Codes: G09G 2330/021 Power management, e.g. power saving
• CPC Class Codes: G09G 2360/16 Calculation or use of calculated indices related to luminance levels in display data
• CPC Class Codes: G09G 3/3225 using an active matrix
• CPC Class Codes: G09G 5/10 Intensity circuits

Abstract

A method and device for controlling power of an active matrix organic light-emitting diode are provided. The method for controlling power of an active matrix organic light-emitting diode includes: calculating a frame data rate, which is a ratio of a light emitting pixel quantity representing a specific color in an image data to be displayed; determining a luminance reducing amount mapped to the frame data rate; and controlling and displaying an entire luminance of an image according to the luminance reducing amount.

Claims

1. A method comprising:

obtaining RGB color information of a plurality of pixels forming an image to be displayed via a display operatively coupled with an electronic device;

checking, based at least in part on a subset of the RGB color information of the plurality of pixels, whether a color of each pixel of the plurality of pixels falls within a specified range of colors;

calculating an amount of the image having the color corresponding to the specified range of colors;

determining a luminance to be used for the image based at least in part on the amount; and

displaying the image according to the determined luminance via the display, the displaying including adjusting a voltage to be supplied to one or more pixels of the plurality of pixels according to the determined luminance.

2. The method of claim 1, wherein the display comprises an active matrix organic light emitting diode (AMOLED).

3. The method of claim 1, wherein the obtaining comprises:

obtaining the RGB color information representing at least one of red, green, or blue from at least one portion of the image.

4. The method of claim 1, wherein the calculating comprises:

analyzing one or more specified binary digits from a plurality of binary digits associated with the RGB color information.

5. The method of claim 4, wherein the analyzing comprises:

determining whether one or more upper level binary digits among the plurality of binary digits are 1.

6. The method of claim 1, wherein the calculating comprises:

periodically calculating the amount based at least in part on a determination that the image corresponds to a moving picture.

7. The method of claim 1, wherein the specified range of colors comprise white, and wherein the determining comprises:

determining the luminance as having a reduced level as compared a level of an original luminance of the image, based at least in part on a determination that the amount of the image corresponding to white is above a specified value.

8. The method of claim 1, wherein the determining comprises:

determining the luminance based on at least one of a size or driving voltage of the display.

9. An apparatus comprising:

a display; and

a processor-implemented controller operatively coupled with the display, the processor-implemented controller configured to;

obtain RGB color information of a plurality of pixels forming an image to be displayed via the display;

check, based at least in part on the RGB color information, whether a color of each pixel of the plurality of pixels falls within a specified range of colors;

calculate a ratio of the image having the color corresponding to the specific range of colors;

determine a luminance corresponding to the image based at least in part on the ratio; and

display the image according to the determined luminance via the display, the displaying including adjusting a voltage to be supplied to one or more pixels of the plurality of pixels according to the determined luminance.

10. The apparatus of claim 9, wherein the display comprises an active matrix organic light emitting diode (AMOLED).

11. The apparatus of claim 9, wherein the processor-implemented controller is configured to:

obtain the RGB color information representing at least one of red, green, or blue from at least one portion of the image.

12. The apparatus of claim 9, wherein the processor-implemented controller is configured to:

analyze one or more specified binary digits from a plurality of binary digits associated with the RGB color information.

13. The apparatus of claim 9, wherein the processor-implemented controller is configured to:

periodically calculate the ratio based at least in part on a determination that the image corresponds to a moving picture.

14. The apparatus of claim 9, wherein the specified range of colors comprises white and wherein the processor-implemented controller is configured to:

determine the luminance as having a reduced level as compared a level of an original luminance of the image, based at least in part on a determination that the ratio of the image corresponding to white is above a specified value.

15. The apparatus of claim 9, wherein the processor-implemented controller is configured to:

determine the luminance based on at least one of a size or driving voltage of the display.

16. A non-transitory machine-readable storage device storing instructions that, when executed by one or more processors, cause the one or more processors to perform operations comprising:

obtaining RGB color information of a plurality of pixels forming an image to be displayed via a display operatively coupled with an electronic device;

checking, based at least in part on a subset of the RGB color information of each of the plurality of pixels, whether a color of each of the plurality of pixels falls within a specified range of colors;

calculating a ratio of the image having the color corresponding to the specific range of colors;

determining a luminance corresponding to the image based at least in part on the ratio; and

displaying the image according to the determined luminance via the display, the displaying including adjusting a voltage to be supplied to one or more pixels of the plurality of pixels according to the determined luminance.

17. The non-transitory machine-readable storage device of claim 16, wherein the specified range of colors comprise black.