Display device, picture signal processing method, and program
View Patent ↗There is provided a display device including a display unit having pixels, each of which includes a luminescence element that individually becomes luminous depending on a current amount and a pixel circuit for controlling a current applied to the luminescence element according to a voltage signal, where the pixels are arranged in a matrix pattern. The display device includes an average luminance calculator ( 200 ) for calculating average luminance for a predetermined period of the input picture signal, and also includes a luminous time setter ( 202 ) for setting an effective duty depending on the calculated average luminance by the average luminance calculator ( 200 ), the effective duty regulating for each one frame a luminous time for which the luminescence element is luminous. The luminous time setter ( 202 ) sets the effective duty such that a luminescence amount regulated by a preset reference duty and possible maximum luminance of a picture signal.
1. A display method including:
supplying a selection signal for selecting pixels to be luminous in a predetermined scanning cycle, each of the pixels including a luminescence element that individually becomes luminous depending on a current amount and a pixel circuit for controlling a current applied to the luminescence element according to a voltage signal;
supplying to the pixels the voltage signal according to an input picture signal, the pixels, the scan lines, and the data lines arranged in a matrix pattern;
multiplying primary colour signals of the picture signal respectively by adjustment values for the respective primary colour signals based on a voltage-current characteristic;
calculating average luminance for a first area, based on the picture signal multiplied by the adjustment values;
calculating average luminance for a second area, based on the picture signal multiplied by the adjustment values, the second area being smaller than the first area;
selecting, as an average luminance, a larger value out of an average luminance calculated for the first area and an average luminance calculated for the second area; and
setting an effective duty according to the average luminance.
2. The display method of according to claim 1 , wherein setting the effective duty includes setting the effective duty independently of additional images when the additional images are attached to a display image corresponding to the input picture signal to process.
3. The display method according to claim 2 , wherein the additional images are black images.
4. The display method according to claim 1 , wherein the luminescence element is an organic electroluminescence element.
5. The display method according to claim 1 , wherein the effective duty is more than 25%.
6. The display method according to claim 1 , wherein
the first area corresponds to an entire display screen; and
the second area is smaller than the first area in horizontal and vertical directions.
7. The display method according to claim 6 , wherein setting the effective duty includes setting the effective duty independently of additional images when the additional images are attached to a display image corresponding to the input picture signal to process.
8. The display method according to claim 7 , wherein the additional images are black images.
9. The display method according to claim 6 , wherein the luminescence element is an organic electroluminescence element.
10. The display method according to claim 6 , wherein the effective duty is more than 25%.
11. A display device including
processing circuitry;
a display having pixels including a luminescence element and a pixel circuit configured to control a current applied to the luminescence element according to a voltage signal;
scan lines configured to supply a selection signal in a predetermined scanning cycle; and
data lines configured to supply to the pixels the voltage signal according to an input picture signal,
wherein the processing circuitry is configured to:
multiply primary colour signals of the picture signal respectively by adjustment values for the respective primary colour signals based on a voltage-current characteristic;
calculate average luminance for a first area, based on the picture signal multiplied by the adjustment values;
calculate average luminance for a second area, based on the picture signal multiplied by the adjustment values, the second area being smaller than the first area;
select, as an average luminance, a larger value out of an average luminance calculated for the first area and an average luminance calculated for the second area; and
set an effective duty according to the average luminance.
12. The display device according to claim 11 , wherein the effective duty is set independently of additional images when the additional images are attached to a display image corresponding to the input picture signal to process.
13. The display device according to claim 12 , wherein the additional images are black images.
14. The display device according to claim 11 , wherein the luminescence element is an organic electroluminescence element.
15. The display device according to claim 11 , wherein the effective duty is more than 25%.
16. The display device according to claim 11 , wherein
the first area corresponds to an entire display screen; and
the second area is smaller than the first area in horizontal and vertical directions.
17. The display device according to claim 16 , wherein the effective duty is set independently of additional images when the additional images are attached to a display image corresponding to the input picture signal to process.
18. The display device according to claim 17 , wherein the additional images are black images.
19. The display device according to claim 16 , wherein the luminescence element is an organic electroluminescence element.
20. The display device according to claim 16 , wherein the effective duty is more than 25%.