Display apparatus and control method for saving power thereof

• US 9,035,974 B2
• Filed: 03/13/2013
• Issued: 05/19/2015
• Est. Priority Date: 11/19/2012
• Status: Active Grant

• Current Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Original Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Inventors: Choi, Byeong-Hwa, Lee, Seung-Bae
• Primary Examiner(s): Edun, Muhammad N
• Application Number:
  US13/799,180
• Publication Number:
  US 20140139557A1
• Time in Patent Office: 797 Days
• Field of Search: None
• US Class Current: 345/690
• CPC Class Codes: G09G 2320/0626 for control of overall brightness
• CPC Class Codes: G09G 2330/021 Power management, e.g. power saving
• 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 3/22 using controlled light sources
• CPC Class Codes: G09G 5/00 Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators image data processing or generation, in general G06T

Abstract

In a method and a device for controlling luminance of a display unit to save power of a display device including the display unit for displaying on a screen, the method includes: calculating a second luminance to which the luminance of the display unit is to be changed considering a first luminance that is a current luminance of the display unit and a constant K determined according to Weber'"'"'s law; and changing the luminance of the display unit to the second luminance.

Claims

1. A method of controlling a luminance of a display unit to save power of a display device comprising the display unit for displaying on a screen, the method comprising the steps of:

calculating a second luminance L2 to which the luminance of the display unit is to be changed considering a first luminance L1 that is a current luminance of the display unit and a constant K determined according to Weber'"'"'s law; and

changing the luminance of the display unit to the second luminance L2;

wherein

2. The method of claim 1, the constant K being Weber'"'"'s constant.

3. The method of claim 1, the second luminance being lower than the first luminance.

4. The method of claim 1, the calculating of the second luminance and the changing of the luminance being repeated according to the remaining power of the display device and a time interval.

5. The method of claim 1, further comprising the step of selecting one of a plurality of modes differentiated by a maximal luminance of the display device according to a selection by a user;

the calculating of the second luminance further comprising considering the selected mode to calculate the second luminance.

6. The method of claim 5, the maximal luminance being a luminance of the display unit when remaining power of the display device is about 100%.

7. The method of claim 1, the second luminance being calculated so that the luminance of the display unit periodically alternates.

8. The method of claim 7, further comprising the step of selecting one of a plurality of modes differentiated by a maximal luminance of the display unit according to a selection by a user;

the luminance of the screen periodically alternating within a range not exceeding the maximal luminance corresponding to the selected mode.

9. A computer which is programmed to execute the method of claim 1.

10. A device for controlling a luminance of a display unit to save power of a display device comprising the display unit for displaying on a screen, the device comprising:

a luminance calculation unit configured to calculate a second luminance L2 to which the luminance of the display unit is to be changed considering a first luminance L1 that is a current luminance of the display unit and a constant K determined according to Weber'"'"'s law; and

a luminance control unit configured to change the luminance of the display unit to the second luminance L2;

wherein

11. The device of claim 10, the constant K being Weber'"'"'s constant.

12. The device of claim 10, the second luminance being lower than the first luminance.

13. The device of claim 10, the luminance calculation unit and the luminance control unit repeating the calculating and changing of the luminance according to the remaining power of the display device and a time interval.

14. The device of claim 10, further comprising a mode selection unit configured to select one of a plurality of modes differentiated by a maximal luminance of the display device according to a selection by a user;

the luminance calculation unit further considering the selected mode to calculate the second luminance.

15. The device of claim 14, each of the modes being a luminance of the display unit when remaining power of the display device is about 100%.

16. The device of claim 10, the luminance calculation unit calculating the second luminance so that the luminance of the display unit periodically alternates.

17. The device of claim 16, further comprising a mode selection unit configured to select one of a plurality of modes differentiated by a maximal luminance of the display unit according to a selection by a user;

the luminance of the display unit periodically alternating within a range not exceeding the maximal luminance corresponding to the selected mode.

18. A method of controlling a luminance of a display unit to save power of a display device comprising the display unit for displaying on a screen, the method comprising the steps of:

calculating a second luminance L2 to which the luminance of the display unit is to be changed considering a first luminance L1 that is a current luminance of the display unit and a constant K determined according to Weber'"'"'s law; and

changing the luminance of the display unit to the second luminance L2 so as to obtain a just noticeable difference JND that is a minimal difference noticeable by a user;

wherein

19. The method of claim 18, the constant K being Weber'"'"'s constant.

20. The method of claim 18, the calculating of the second luminance and the changing of the luminance being repeated according to one of a remaining power of the display device and a time interval.