Power reduction driving controller, organic light emitting display including the same, and associated methods

• US 20080204475A1
• Filed: 02/21/2008
• Published: 08/28/2008
• Est. Priority Date: 02/23/2007
• Status: Abandoned Application

• Current Assignee: Samsung Mobile Display Company Limited (Samsung Electronics Co. Ltd.)
• Original Assignee: Samsung Mobile Display Company Limited (Samsung Electronics Co. Ltd.)
• Inventors: Song, June-young, Kim, Jong-soo
• Application Number:
  US12/071,437
• Publication Number:
  US 20080204475A1
• Time in Patent Office: Days
• US Class Current: 345/660
• CPC Class Codes: G06F 1/3218 of display devices
• CPC Class Codes: G06F 1/3265 Power saving in display device
• CPC Class Codes: G09G 2320/0271 Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping
• CPC Class Codes: G09G 2320/0626 for control of overall brightness
• 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 2340/16 Determination of a pixel data signal depending on the signal applied in the previous frame
• CPC Class Codes: G09G 2360/16 Calculation or use of calculated indices related to luminance levels in display data
• CPC Class Codes: G09G 3/3208 organic, e.g. using organic light-emitting diodes [OLED]
• CPC Class Codes: G09G 5/10 Intensity circuits
• CPC Class Codes: Y02D 10/00 Energy efficient computing, e.g. low power processors, power management or thermal management
• CPC Class Codes: Y02D 30/50 in wire-line communication networks, e.g. low power modes or reduced link rate

Abstract

A power reduction driving controller includes an image analyzer adapted to analyze input image data, a scaling factor calculator adapted to generate a scaling factor with respect to the analyzed input image data, and to apply the scaling factor to the input image data to generate a scaled-down image data, and an intensity resealing unit adapted to reduce an overall intensity level of the input image data.

Claims

1. A power reduction driving controller, comprising:

an image analyzer adapted to analyze input image data;

a scaling factor calculator adapted to generate a scaling factor with respect to the analyzed input image data, and to apply the scaling factor to the input image data to generate a scaled-down image data; and

an intensity rescaling unit adapted to reduce an overall intensity level of the input image data.

2. The power reduction driving controller as claimed in claim 1, wherein the scaling factor calculator includes a parameter table having a plurality of conversion parameters.

3. The power reduction driving controller as claimed in claim 1, further comprising a selector, the selector adapted to determine transmittance of an output of the intensity rescaling unit to an output of the power reduction driving controller.

4. The power reduction driving controller as claimed in claim 3, wherein the image analyzer is adapted to control the selector.

5. The power reduction driving controller as claimed in claim 1, wherein the image analyzer is adapted to analyze the input image data to generate a luminance histogram.

6. The power reduction driving controller as claimed in claim 5, wherein the intensity rescaling unit is adapted to receive the luminance histogram and to rescale a total intensity of the input image data based on a distribution pattern of the luminance histogram.

7. The power reduction driving controller as claimed in claim 5, wherein the scaling factor calculator is adapted to receive the luminance histogram and to calculate conversion attenuation factors in accordance with the luminance histogram.

8. The power reduction driving controller as claimed in claim 7, wherein the conversion attenuation factors include one or more of a local attenuation factor, a zonal attenuation factor, a temporal attenuation factor, and/or a luminance attenuation factor.

9. The power reduction driving controller as claimed in claim 8, wherein the scaling factor calculator is adapted to obtain one or more of gradient magnitudes of pixels in the input image data, spatial locations of the pixels in the input image data, speed between frames of the pixels in the input image data, and/or luminance level of the pixels in the input image data to calculate the local attenuation factor, zonal attenuation factor, temporal attenuation factor, and luminance attenuation factor, respectively.

10. The power reduction driving controller as claimed in claim 8, wherein the scaling factor is a product of the local attenuation factor, zonal attenuation factor, temporal attenuation factor, and luminance attenuation factor.

11. The power reduction driving controller as claimed in claim 8, wherein the scaling factor calculator is adapted to obtain the gradient magnitudes of pixels in the input image data, the gradient magnitudes including high frequency components of the analyzed input image data.

12. The power reduction driving controller as claimed in claim 10, wherein the scaling factor calculator is adapted to obtain the spatial location of the pixels, the spatial location including coordinate values of x and y for each pixel.

13. The power reduction driving controller as claimed in claim 10, wherein the scaling factor calculator is adapted to obtain the speed between frames of pixels, the speed between frames including compared values of two moving continuous frames.

14. An organic electroluminescent (EL) display, comprising:

a display panel including a plurality of intersecting scan and data lines;

a scan driver adapted to generate and apply selection signals to the scan lines;

a data driver adapted to generate and apply data signals to the data lines; and

a power reduction driving controller adapted to scale-down image data signals applied to the data driver, the power reduction driver including,

an image analyzer adapted to analyze input image data;

a scaling factor calculator adapted to generate a scaling factor with respect to the analyzed input image data, and to apply the scaling factor to the input image data to generate a scaled-down image data; and

an intensity rescaling unit adapted to reduce an overall intensity level of the input image data.

15. The organic EL display as claimed in claim 14, wherein the scaling factor calculator includes a parameter table with a plurality of conversion parameters.

16. The organic EL display as claimed in claim 14, further comprising a selector adapted to determine transmittance of an output of the intensity rescaling unit to an output of the power reduction driving controller.

17. The organic EL display as claimed in claim 14, wherein the image analyzer is adapted to extract luminance components from the input image data to generate a histogram.

18. The organic EL display as claimed in claim 17, wherein the power reduction driving controller is adapted to transmit the histogram from the image analyzer to the intensity scaling unit and to the scaling factor calculator.

19. The organic EL display as claimed in claim 18, wherein the intensity rescaling unit is adapted to rescale a total intensity of the input image data based on a distribution pattern of the histogram, and the scaling factor calculator is adapted to calculate the scaling factor based on the histogram.

20. A method of scaling down image data input into a data driver of an organic electroluminescent (EL) display, comprising:

analyzing input image data via an image analyzer;

generating a scaling factor with respect to the analyzed input image data;

applying the scaling factor to the input image data to generate a scaled-down image data; and

reducing an overall intensity level of the input image data.