Method of power conservation for organic light-emitting display according to light emitting area ratio

• US 8,299,985 B2
• Filed: 06/19/2006
• Issued: 10/30/2012
• Est. Priority Date: 06/17/2005
• Status: Active Grant

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Display Co., Ltd.
• Inventors: Shin, Seung Rok, Hwang, Hyun Ha
• Primary Examiner(s): Mengistu, Amare
• Assistant Examiner(s): Lee, Gene W
• Application Number:
  US11/917,849
• Publication Number:
  US 20080198105A1
• Time in Patent Office: 2,325 Days
• Field of Search: 345 76- 83, 345/204, 345211-214, 315/169.3
• US Class Current: 345/77
• CPC Class Codes: G09G 2320/0285 using tables for spatial correction of display data
• 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 3/3208 organic, e.g. using organic light-emitting diodes [OLED]

Abstract

Provided is an organic light-emitting display device. The organic light-emitting display device includes a light-emitting unit having a plurality of OLEDs to emit light, a light-emitting level setting unit setting a light-emitting level depending on a light-emitting area and/or change in a light-emitting degree of the light-emitting unit, a look-up table in which data for the light-emitting degree of the light-emitting unit that corresponds to each light-emitting area for each light-emitting level is set and stored, a light-emitting control unit controlling the light-emitting area of the light-emitting unit and/or the light-emitting degree depending on a light-emitting level with reference to the data set on the look-up table.

Claims

1. An organic light-emitting display device comprising:

a light-emitting unit having a plurality of OLEDs (organic light-emitting diodes) to emit light;

a light-emitting level setting unit, wherein the light-emitting level setting unit sets a light-emitting level depending on a light-emitting area and/or a change in a light-emitting degree of the light-emitting unit;

a look-up table in which data for the light-emitting degree of the light-emitting unit that corresponds to each light-emitting area for each light-emitting level is set and stored; and

a light-emitting control unit capable of controlling the light-emitting area and the light-emitting degree of the light-emitting unit depending on a light-emitting level with reference to the data set on the look-up table when displaying an image contained in a next frame,

wherein a power consumption of the light-emitting unit at a light-emitting area ratio less than 20% increases in proportion to the light-emitting area,

wherein a power consumption of the light emitting unit at a light-emitting area ratio more than 20% remains at a constant value less than a predetermined value regardless of the light-emitting area,

wherein the data for the light-emitting degree stored in the look-up table contains a maximum light-emitting time and/or maximum amount of light-emitting according to them light-emitting area of the light-emitting unit, and

wherein the data for the light-emitting degree stored in the look-up table is set such that the maximum light-emitting time and/or maximum amount of light-emitting of the light-emitting unit decreases as the light-emitting area of the light-emitting unit increases for the same light-emitting level.

2. The organic light-emitting display device according to claim 1, wherein the light-emitting control unit drives the OLEDs of the light-emitting unit using a emitting degree value less than the light-emitting degree value stored in the look-up table for a selected light-emitting level.

3. The organic light-emitting display device according to claim 1, wherein the light-emitting level setting unit extracts data from an entire image display region of an input frame to set the light-emitting level.

4. The organic light-emitting display device according to claim 1, wherein the light-emitting level setting unit extracts data from a partial image display region of an input frame to set the light-emitting level.

5. The organic light-emitting display device according to claim 1, wherein the light-emitting level setting unit classifies and sets light-emitting levels according to power consumption of the light-emitting unit when setting the light-emitting levels.

6. The organic light-emitting display device according to claim 1, wherein the light-emitting control unit controls an input current value to the light-emitting unit together with the light-emitting area and/or light-emitting degree of the light-emitting unit according to the light-emitting level when controlling the light-emitting unit.

7. A method of driving an organic light-emitting display device, wherein the method comprises:

extracting data from an input frame and setting a light-emitting level according to a light-emitting area and a change in a light-emitting degree of a light-emitting unit having a plurality of OLEDs; and

controlling the light-emitting area and/or light-emitting degree of the light-emitting unit according to the set light-emitting level and displaying an image when displaying an image contained in a next frame,

wherein a power consumption of the light-emitting unit at a light-emitting area ratio less than 20% increases in proportion to the light-emitting area,

wherein a power consumption of the light emitting unit at a light-emitting area ratio more than 20% remains at a constant value less than a predetermined value regardless of the light-emitting area,

wherein the controlling of the light-emitting area and/or light-emitting degree of the light-emitting unit according to the set light-emitting level to display the image comprises driving the OLEDs of the light-emitting unit with reference to a look-up table in which data for the light-emitting degree of the light-emitting unit that corresponds to each light-emitting area for each light-emitting level is set and stored,

wherein the data for the light-emitting degree stored in the look-up table contains a maximum light-emitting time and/or maximum amount of light-emitting depending on the light-emitting area of the light-emitting unit, and

wherein the data for the light-emitting degree stored in the look-up table is set such that the maximum light-emitting time and/or maximum amount of light-emitting of the light-emitting unit decreases as the light-emitting area of the light-emitting unit increases for the same light-emitting level.

8. The method according to claim 7, wherein the setting of the light-emitting level comprises extracting data from an entire image display region of an input frame to set the light-emitting level.

9. The method according to claim 7, wherein the setting of the light-emitting level comprises extracting data from a partial image display region of an input frame to set the light-emitting level.

10. The method according to claim 7, wherein the controlling of the light-emitting area and/or light-emitting degree of the light-emitting unit according to the set light-emitting level to display the image comprises driving the OLEDs of the light-emitting unit using a light-emitting degree value less than the light-emitting degree value stored in the look-up table for a selected light-emitting level.

11. The method according to claim 7, wherein the setting of the light-emitting level comprises classifying and setting light-emitting levels according to power consumption of the light-emitting unit.

12. A method of driving an organic light-emitting display device, wherein the method comprises:

extracting data from an input frame and setting a light-emitting level according to a light-emitting area and a change in a light-emitting degree of a light-emitting unit having a plurality of OLEDs; and

controlling the light-emitting area and/or light-emitting degree of the light-emitting unit according to the set light-emitting level, and controlling an input current value to the light-emitting unit to display an image when displaying an image contained in a next frame,

wherein a power consumption of the light-emitting unit at a light-emitting area ratio less than 20% increases in proportion to the light-emitting area,

wherein a power consumption of the light emitting unit at a light-emitting area ratio more than 20% remains at a constant value less than a predetermined value regardless of the light-emitting area,

wherein the controlling of the light-emitting area and/or light-emitting degree of the light-emitting unit according to the set light-emitting level to display the image comprises driving the OLEDs of the light-emitting unit with reference to a look-up table in which data for the light-emitting degree and an input current of the light-emitting unit that corresponds to each light-emitting area for each light-emitting level is set and stored,

wherein the data for the light-emitting degree stored in the look-up table contains a maximum light-emitting time and/or maximum amount of light-emitting according to the light-emitting area of the light-emitting unit, and

wherein the data for the light-emitting degree stored in the look-up table is set such that the maximum light-emitting time and/or maximum amount of light-emitting of the light-emitting unit decreases as the light-emitting area of the light-emitting unit increases for the same light-emitting level.

13. The method according to claim 12, wherein the setting of the light-emitting level comprises extracting data from an entire image display region of an input frame to set the light-emitting level.

14. The method according to claim 12, wherein the setting of the light-emitting level comprises extracting data from a partial image display region of an input frame to set the light-emitting level.

15. The method according to claim 12, wherein the data for the input current stored in the look-up table is set such that a maximum input current to the light-emitting unit decreases as the light-emitting area of the light-emitting unit increases for the same light-emitting level.

16. The method according to claim 12, wherein the controlling of the light-emitting area and/or light-emitting degree of the light-emitting unit according to the set light-emitting level to display the image comprises driving the OLEDs of the light-emitting unit using a value for the light-emitting degree and a value for the input current that is less than the light-emitting degree and input current values stored in the look-up table for a selected light-emitting level.

17. The method according to claim 12, wherein the setting of the light-emitting level comprises classifying and setting light-emitting levels according to power consumption of the light-emitting unit when setting the light-emitting levels.

18. A mobile communication terminal comprising:

an organic light-emitting display device including a light-emitting unit having a plurality of OLEDs to emit light, a light-emitting level setting unit, wherein the light-emitting level setting unit sets a light-emitting level according to a light-emitting area and/or a change in a light-emitting degree of the light-emitting unit, a look-up table in which data for the light-emitting degree of the light-emitting unit that corresponds to each light-emitting area for each light-emitting level is set and stored according to the light-emitting level set by the light-emitting level setting unit, and a light-emitting control unit capable of controlling the light-emitting area and the light-emitting degree of the light-emitting unit depending on a light-emitting level with reference to the data set on the look-up table when displaying an image contained in a next frame;

a communication element to perform communication with the outside; and

a controller to control the communication element and the organic light-emitting display device,

wherein a power consumption of the light-emitting unit at a light-emitting area ratio less than 20% increases in proportion to the light-emitting area,

wherein a power consumption of the light emitting unit at a light-emitting area ratio more than 20% remains at a constant value less than a predetermined value regardless of the light-emitting area,

wherein the data for the light-emitting degree stored in the look-up table contains a maximum light-emitting time and/or maximum amount of light-emitting according to the light-emitting area of the light-emitting unit, and

wherein the data for the light-emitting degree stored in the look-up table is set such that the maximum light-emitting time and/or maximum amount of light-emitting of the light-emitting unit decreases as the light-emitting area of the light-emitting unit increases for the same light-emitting level.

19. A mobile communication terminal comprising:

an organic light-emitting display device including;

a light-emitting unit having a plurality of OLEDs to emit light, a light-emitting level setting unit, wherein the light-emitting level setting unit sets a light-emitting level depending on a light-emitting area and/or a change in a light-emitting degree of the light-emitting unit, a look-up table in which data for the light-emitting degree of the light-emitting unit that corresponds to each light-emitting area for each light-emitting level is set and stored according to the light-emitting level set by the light-emitting level setting unit, and a light-emitting control unit capable of controlling the light-emitting area and the light-emitting degree of the light-emitting unit according to a light-emitting level with reference to the data set on the look-up table when displaying an image contained in a next frame; and

a controller capable of transmitting image signals to the organic light-emitting display device,

wherein a power consumption of the light-emitting unit at a light-emitting area ratio less than 20% increases in proportion to the light-emitting area,

wherein a power consumption of the light emitting unit at a light-emitting area ratio more than 20% remains at a constant value less than a predetermined value regardless of the light-emitting area,

wherein the data for the light-emitting degree stored in the look-up table contains a maximum light-emitting time and/or maximum amount of light-emitting according to the light-emitting area of the light-emitting unit, and

wherein the data for the light-emitting degree stored in the look-up table is set such that the maximum light-emitting time and/or maximum amount of light-emitting of the light-emitting unit decreases as the light-emitting area of the light-emitting unit increases for the same light-emitting level.