Power control device and method for a display device

Patent metadata

Field	Value
Publication number	US-9257072-B2
Application number	US-201314046724-A
Country	US
Kind code	B2
Filing date	Oct 4, 2013
Priority date	May 27, 2013
Publication date	Feb 9, 2016
Grant date	Feb 9, 2016

Abstract

Disclosed is a power control device for a display device, including: a current scaling factor calculation unit calculating a current scaling factor according to an input data signal and a load of the input data signal; a data scaling unit generating a data scaling factor based on the current scaling factor and scaling a data signal corresponding to light emitting gradation of a pixel; and a gamma scaling unit generating a gamma scaling factor based on the current scaling factor and scaling a gamma value for gamma correction of a data signal.

First claim

What is claimed is:

1. A power control device for a display device, comprising: a current scaling factor calculation unit configured to calculate a current scaling factor according to an input data signal received from a timing controller that controls scan and data driving of the display device and a load of the input data signal; a data scaling unit configured to generate a data scaling factor based on the current scaling factor and configured to scale a data signal corresponding to a light emitting gradation of a pixel of the display device; a gamma scaling unit configured to generate a gamma scaling factor based on the current scaling factor and configured to scale a gamma value for gamma correction of the data signal, and a light emitting duty scaling unit configured to generate a light emitting scaling factor based on the current scaling factor and configured to scale a light emitting duty of the pixel.

2. The power control device for the display device of claim 1 , wherein the current scaling factor calculation unit is configured to calculate the current scaling factor using the following Equation: (I_SF)*(Load)P=NPC Limit wherein, I_SF represents the current scaling factor, Load represents the load of the input data signal, and P represents a load coefficient which satisfies 0<P≦1.

3. The power control device for the display device of claim 1 , further comprising a timing filter configured to generate an over-current scaling factor by recalculating the current scaling factor.

4. The power control device for the display device of claim 3 , wherein the timing filter, when calculating of the over-current scaling factor, is configured to use an over-current load coefficient P_OC different from the load coefficient used to calculate the current scaling factor.

5. The power control device for the display device of claim 4 , wherein the over-current load coefficient is larger than the load coefficient.

6. The power control device for the display device of claim 1 , wherein the current scaling factor, the data scaling factor, the gamma scaling factor, and the light emitting duty scaling factor satisfy the following Equation: (the data scaling factor)*(the gamma scaling factor)*(the light emitting duty scaling factor)=(the current scaling factor).

7. A power control method for a display device, comprising: calculating a current scaling factor according to an input data signal received from a timing controller that controls scan and data driving of the display device and a load of the input data signal; generating a data scaling factor based on the current scaling factor and scaling a data signal corresponding to a light emitting gradation of a pixel of the display device; generating a gamma scaling factor based on the current scaling factor and scaling a gamma value for gamma correction of the data signal, and generating a light emitting scaling factor based on the current scaling factor and scaling a light emitting duty of the pixel.

8. The power control method for the display device of claim 7 , wherein the current scaling factor is calculated using the following Equation:
(1SF)*(Load) P =NPC Limit
wherein, I_SF represents the current scaling factor, Load represents the load of the input data signal, and P represents a load coefficient, which satisfies (0<P≦1).

9. The power control method for the display device of claim 7 , further comprising generating an over-current scaling factor by recalculating the current scaling factor.

10. The power control method for the display device of claim 9 , wherein the over-current scaling factor is calculated using an over-current load coefficient P OC different from the load coefficient used to calculate the current scaling factor wherein P_OC is the over-current load coefficient which satisfies 0<P_OC≦1.

11. The power control method for the display device of claim 10 , wherein the over-current load coefficient is larger than the load coefficient.

12. The power control method for the display device of claim 7 , wherein the current scaling factor, the data scaling factor, the gamma scaling factor, and the light emitting duty scaling factor satisfy the following equation:
(the data scaling factor)*(the gamma scaling factor)*(the light emitting duty scaling factor)=(the current scaling factor).

13. A power control device for a display device, comprising: a current scaling factor calculation unit configure to calculate a current scaling factor using the following Equation: (I_SF)*(Load) P =NPC Limit wherein, I_SF is the current scaling factor, Load is a load of a data signal received from a timing controller that controls scan and data driving of the display device corresponding to a light emitting gradation of a pixel of the display device, and P is a load coefficient which satisfies 0<P≦1; a data scaling unit configured to generate a data scaling factor based on the current scaling factor and configured to scale the data signal; and a gamma scaling unit configured to generate a gamma scaling factor based on the current scaling factor and configured to scale a gamma value for gamma correction of the data signal.

Assignees

• Samsung Display Co Ltd

Inventors

• Han Sang-Myeon

Classifications

• G09G2360/16

  Calculation or use of calculated indices related to luminance levels in display data · CPC title

• G09G2320/0271

  Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping · CPC title

• G09G2320/064

  by time modulation of the brightness of the illumination source · CPC title

• G09G2330/021

  Power management, e.g. power saving · CPC title

• G09G3/3233 Primary

  with pixel circuitry controlling the current through the light-emitting element · CPC title