DISPLAY DEVICE

• US 20150054805A1
• Filed: 01/24/2014
• Published: 02/26/2015
• Est. Priority Date: 08/21/2013
• Status: Abandoned Application

• Current Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Original Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Inventors: LEE, JA EUN, LEE, SEUNGBAE
• Application Number:
  US14/163,611
• Publication Number:
  US 20150054805A1
• Time in Patent Office: Days
• US Class Current: 345/207
• CPC Class Codes: G09G 2310/066 Waveforms comprising a gently increasing or decreasing portion, e.g. ramp
• CPC Class Codes: G09G 2320/0626 for control of overall brightness
• CPC Class Codes: G09G 2320/0653 Controlling or limiting the speed of brightness adjustment of the illumination source
• CPC Class Codes: G09G 2330/026 Arrangements or methods related to booting a display
• CPC Class Codes: G09G 2360/144 the light being ambient light
• CPC Class Codes: G09G 5/10 Intensity circuits

Abstract

A display device includes: an illumination detection unit which measures an external illumination value and outputs an illumination signal corresponding to the measured external illumination value; a control unit which determines an illumination range corresponding to the measured external illumination value based on the illumination signal and outputs a brightness control signal corresponding to the illumination range; and a display unit which displays an image based on the brightness control signal, where when the measured external illumination value corresponds to a low illumination range, an amount of brightness variation of the image displayed by the display unit is increased over time during a first interval.

Claims

1. A display device comprising:

an illumination detection unit which measures an external illumination value and outputs an illumination signal corresponding to the measured external illumination value;

a control unit which determines an illumination range corresponding to the measured external illumination value based on the illumination signal and outputs a brightness control signal corresponding to the illumination range; and

a display unit which displays an image based on the brightness control signal,

wherein when the measured external illumination value corresponds to a low illumination range, an amount of brightness variation of the image displayed by the display unit is increased over time during a first interval.

2. The display device of claim 1, further comprising:

an input unit which outputs an input signal to the control unit based on an external input signal,

wherein the control unit outputs an operation signal to the illumination detection unit in response to the input signal, and

wherein the illumination detection unit measures the external illumination value in response to the operation signal.

3. The display device of claim 2, wherein

when the measured external illumination value corresponds to the low illumination range, the image displayed by the display unit has a predetermined brightness during a second interval after the first interval.

4. The display device of claim 3, wherein

the predetermined brightness of the image displayed during the second interval is substantially proportional to the measured external illumination value.

5. The display device of claim 3, wherein

when the measured external illumination value corresponds to the low illumination range, the amount of brightness variation of the image displayed by the display unit is decreased over time during a third interval after the first interval and before the second interval.

6. The display device of claim 3, wherein

the first interval comprises a plurality of sub intervals;

and

the plurality of sub intervals comprises;

a first sub interval, during which a brightness of the image is maintained substantially constantly as a first brightness;

a second sub interval, during which the brightness of the image is maintained substantially constantly as a second brightness, after the first sub interval; and

a third sub interval, during which the brightness of the image is maintained substantially constantly as a third brightness, after the second sub interval,

wherein a difference between the second brightness and the third brightness is greater than a difference between the first brightness and the second brightness.

7. A display device comprising:

an illumination detection unit which measures an external illumination value and outputs an illumination signal corresponding to the measured external illumination value;

a control unit which determines an illumination range corresponding to the measured external illumination value, and outputs a brightness control signal corresponding to the illumination range, wherein the illumination range comprises a low illumination range, an intermediate illumination range and a high illumination range; and

a display unit which displays an image based on the brightness control signal,

wherein an amount of brightness variation of the image displayed by the display unit is increased over time during an initial interval when the measured external illumination value corresponds to the low illumination range.

8. The display device of claim 7, further comprising:

an input unit which outputs an input signal to the control unit based on an external input signal,

wherein the control unit outputs an operation signal to the illumination detection unit in response to the input signal, and

wherein the illumination detection unit measures the external illumination value in response to the operation signal.

9. The display device of claim 8, wherein

the image displayed by the display unit has a first convergence brightness during a stabilization interval after the initial interval when the measured external illumination value corresponds to the low illumination range.

10. The display device of claim 9, wherein

the first convergence brightness is substantially proportional to the measured external illumination value.

11. The display device of claim 8, wherein

the amount of brightness variation of the image displayed by the display unit is decreased over time during an interval between the initial interval and the stabilization interval, when the measured external illumination value corresponds to the low illumination range.

12. The display device of claim 8, wherein

the image displayed by the display unit has a peak brightness during the initial interval and has a second convergence brightness lower than the peak brightness during a stabilization interval after the initial interval, when the measured external illumination value corresponds to the high illumination range.

13. The display device of claim 12, wherein

the second convergence brightness is substantially proportional to the measured external illumination value.

14. The display device of claim 12, wherein

the initial interval comprises a plurality of sub intervals, and

the plurality of sub intervals of the initial interval comprises:

a first interval during which a brightness of the image displayed by the display unit is increased to the peak brightness over time; and

a second interval during which the brightness of the image displayed by the display unit is changed to the second convergence brightness from the peak brightness over time.

15. The display device of claim 14, wherein

the amount of brightness variation of the image displayed by the display unit is increased over time during the second interval.

16. The display device of claim 14, wherein

the amount of brightness variation of the image displayed by the display unit is decreased over time during the second interval.

17. The display device of claim 14, wherein

the second interval comprises a plurality of sub intervals;

and

the plurality of sub intervals of the second interval comprises;

a first sub interval, during which the brightness of the image displayed by the display unit is maintained substantially constantly as a first brightness;

a second sub interval, during which the brightness of the image displayed by the display unit is maintained substantially constantly as a second brightness, after the first sub interval; and

a third sub interval, during which the brightness of the image displayed by the display unit is maintained substantially constantly as a third brightness, after the second sub interval,

wherein a difference between the first brightness and the second brightness is greater than a difference between the second brightness and the third brightness.

18. The display device of claim 17, wherein

the brightness of the image displayed by the display unit is maintained substantially constantly as a third convergence brightness when the measured external illumination value corresponds to the intermediate illumination range.

19. The display device of claim 18, wherein the third convergence brightness is substantially proportional to the measured external illumination value.