Display apparatus and control method thereof
Disclosed are a display apparatus and a control method thereof, the display apparatus including: a display unit which includes a plurality of pixels with an organic light emitting diode (OLED); a power supply which supplies power to the display unit; an image processor which processes an image signal in accordance with the plurality of pixels; and a controller which divides the frame into a plurality of sub-frames, assigns bit weights to each of the divided sub-frames, and controls the power supply to supply a voltage which is adjusted by the assigned bit weights in accordance with the sub-frames to the display unit.
1. A display apparatus comprising:
a display configured to comprise a plurality of pixels with an organic light emitting diode (OLED), each of the plurality of pixels comprising red (R), green (G), and blue (B) pixels;
a power supply configured to supply power to the display;
an image processor configured to process an image signal to be displayed on the display in accordance with the plurality of pixels; and
a controller configured:
to assign a plurality of sub-frames divided from a frame of the image signal to the each of the plurality of pixels,
to drive a pixel so that a sum of output values of the pixel at the plurality of sub-frames corresponds to a brightness of the pixel at the frame, wherein the output values of the pixel at the plurality of sub-frames are predetermined and different from one other, and
to control the power supply to supply a voltage to the pixel at each of the plurality of sub-frames so that a magnitude of the voltage changes according to the output value of the pixel at the each of the plurality of sub-frames,
wherein the controller is further configured to control the power supply to supply a voltage having a same magnitude to the pixel at a last sub-frame of a first frame and at a first sub-frame of a second frame, the last sub-frame of the first frame and the first sub-frame of the second frame being successive.
2. The display apparatus according to claim 1 , wherein the number of sub-frames constituting one frame corresponds to the number of driving bits for the image signal.
3. The display apparatus according to claim 1 , wherein the output values of the pixel at the plurality of sub-frames are determined according to a gray scale of the pixel of a corresponding frame.
4. The display apparatus according to claim 3 , further comprising a storage configured to store a lookup table in which a voltage magnitude or a current magnitude corresponding to the output values of the pixel at the plurality of sub-frames determined in accordance with the gray scale of the pixel is set up.
5. The display apparatus according to claim 1 , wherein the controller drives the pixel so that a sub-frame has a maximum voltage in a most significant bit section of the sub-frame and a minimum voltage in a least significant bit section of the sub-frame.
6. The display apparatus according to claim 5 , wherein the controller drives the pixel so that a voltage of the sub-frame corresponds to half a voltage of a previous sub-frame.
7. The display apparatus according to claim 1 , wherein the controller drives the pixel so that a sub-frame has a maximum voltage in a least significant bit section of the sub-frame and a minimum voltage in a most significant bit section of the sub-frame.
8. The display apparatus according to claim 1 , wherein the controller drives the pixel so that the number of changes for a voltage of the sub-frame with respect to a voltage of a previous sub-frame is minimized.
9. The display apparatus according to claim 1 , wherein the controller drives the pixel so that a difference in voltage between a previous sub-frame and the sub-frame is minimized.
10. The display apparatus according to claim 1 , wherein the sub-frame comprises an address section where a voltage is changed and a light section where a pixel emits light.
11. The display apparatus according to claim 1 , wherein the sub-frame comprises a voltage build section where a voltage is changed, an address section where the changed voltage is stabilized, and a light section where a pixel emits light.
12. The display apparatus according to claim 1 , wherein the controller controls the power supply to readjust voltage by adding a predetermined setup value to a magnitude of the adjusted voltage.
13. The display apparatus according to claim 1 , wherein the controller is configured to control the power supply to supply to the R, G, B pixels a common voltage during each of the plurality of the sub-frames, and
wherein a magnitude of the common voltage is constant within each of the plurality of the sub-frames.
14. A control method for a display apparatus comprising a display with an organic light emitting diode (OLED), the method comprising:
assigning a plurality of sub-frames divided from a frame of an image signal to each of a plurality of pixels, the each of the plurality of pixels comprising red (R), green (G), and blue (B) pixels;
driving a pixel so that a sum of output values of the pixel at the plurality of sub-frames corresponds to a brightness of the pixel at the frame, wherein the output values of the pixel at the plurality of sub-frames are predetermined and different from one other;
supplying a voltage to the pixel at each of the plurality of sub-frames so that a magnitude of the voltage changes according to the output value of the pixel at the each of the plurality of sub-frames,
wherein the supplying a voltage comprises supplying a voltage having a same magnitude to the pixel at a last sub-frame of a first frame and at a first sub-frame of a second frame, the last sub-frame of the first frame and the first sub-frame of the second frame being successive.
15. The method according to claim 14 , wherein the number of sub-frames constituting one frame corresponds to the number of driving bits for the image signal.
16. The method according to claim 14 , wherein the output values of the pixel at the plurality of sub-frames are determined according to a gray scale of the pixel of a corresponding frame.
17. The method according to claim 16 , wherein the supplying the voltage comprises referring to a lookup table in which a voltage magnitude or a current magnitude corresponding to the output values of the pixel at the plurality of sub-frames determined in accordance with the gray scale of the pixel is set up.
18. The method according to claim 14 , wherein the driving the pixel comprises driving the pixel so that a sub-frame has a maximum voltage in a most significant bit section of the sub-frame and a minimum voltage in a least significant bit section of the sub-frame.
19. The method according to claim 14 , wherein the driving the pixel comprises driving the pixel so that a voltage of the sub-frame corresponds to half a voltage of a previous sub-frame.
20. The method according to claim 14 , wherein the driving the pixel comprises driving the pixel so that the sub-frame has a maximum voltage in a least significant bit section of the sub-frame and a minimum voltage in a most significant bit section of the sub-frame.
21. The method according to claim 14 , wherein the driving the pixel comprises driving the pixel so that the number of changes for a voltage of the sub-frame with respect to a voltage of a previous sub-frame is minimized.
22. The method according to claim 14 , wherein the driving the pixel comprises driving the pixel so that a difference in voltage between a previous sub-frame and the sub-frame is minimized.
23. The method according to claim 14 , wherein the sub-frame comprises an address section where a voltage is changed and a light section where a pixel emits light.
24. The method according to claim 14 , wherein the sub-frame comprises a voltage build section where a voltage is changed, an address section where the changed voltage is stabilized, and a light section where a pixel emits light.
25. The method according to claim 14 , further comprising readjusting voltage by adding a predetermined setup value to a magnitude of the adjusted voltage.
26. A non-transitory computer readable medium having instructions recorded thereon to perform the control method of claim 14 .
27. A circuit for a display apparatus having a plurality of pixels, each of the plurality of pixels comprising red (R), green (G), and blue (B) pixels, the circuit comprising:
an image processor configured to process an image signal in accordance with the plurality of pixels; and
a controller configured:
to assign a plurality of sub-frames divided from a frame of the image signal to the each of the plurality of pixels,
to drive a pixel so that a sum of output values of the pixel at the plurality of sub-frames corresponds to a brightness of the pixel at the frame, wherein the output values of the pixel at the plurality of sub-frames are predetermined and different from one other, and
to supply a voltage to the pixel at each of the plurality of sub-frames so that a magnitude of the voltage changes according to the output value of the pixel at the each of the plurality of sub-frames,
wherein the controller is further configured to control the power supply to supply a voltage having a same magnitude to the pixel at a last sub-frame of a first frame and at a first sub-frame of a second frame, the last sub-frame of the first frame and the first sub-frame of the second frame being successive.
28. The circuit for the display apparatus according to claim 27 , wherein the number of sub-frames constituting one frame corresponds to the number of driving bits for the image signal.
29. The circuit for the display apparatus according to claim 27 , wherein the output values of the pixel at the plurality of sub-frames are determined according to a gray scale of the pixel of a corresponding frame.
30. The circuit for the display apparatus according to claim 27 , wherein the controller drives the pixel so that the number of changes for a voltage of the sub-frame with respect to a voltage of a previous sub-frame is minimized.
31. The circuit for the display apparatus according to claim 27 , wherein the controller drives the pixel so that a difference in voltage between a previous sub-frame and the sub-frame is minimized.
32. The circuit for the display apparatus according to claim 27 , wherein the controller readjusts voltage by adding a predetermined setup value to a magnitude of the adjusted voltage.