Display device and driving method thereof

1. A display device, comprising:

a display including a plurality of display elements arranged in lines of a matrix, said plurality of display elements each configured to emit light based on a video signal that is received by said display;

a proportion determiner configured to determine, for each of the lines of the matrix, a proportion of a single frame period during which each of said plurality of display elements of a corresponding line of the lines of the matrix is not to emit the light;

a signal converter configured to convert an amplitude of the video signal for each of the lines of the matrix according to the proportion determined for each of the lines of the matrix by said proportion determiner;

a signal output configured to output the video signal converted by said signal converter to said display as a converted video signal; and

a scanner configured to output a scanning signal to said display for each of the lines of the matrix for inputting the converted video signal to said plurality of display elements of each of the lines of the matrix based on the proportion determined for each of the lines of the matrix by said proportion determiner.

2. The display device according to claim 1 , wherein the proportion of the single frame period of each of the lines of the matrix during which said plurality of display elements of each of the lines of the matrix is not to emit light is independent of the video signal and corresponds to an electric signal for emitting a predetermined gray level being input to said plurality of display elements of each of the lines of the matrix.

3. The display device according to claim 1 , further comprising:

a signal determiner configured to determine, for each of the lines of the matrix, a maximum luminance signal from the video signal before the signal converter converts the video signal,

wherein said proportion determiner is configured to determine, for each of the lines of the matrix, the proportion based on the maximum luminance signal.

4. The display device according to claim 3 , wherein said proportion determiner is configured to increase, for each of the lines of the matrix, the proportion as a luminance level of the maximum luminance signal, determined by said signal determiner, decreases.

5. The display device according to claim 4 , wherein said signal converter is configured to increase, for each of the lines of the matrix, a luminance level of the video signal as the luminance level of the maximum luminance signal, determined by said signal determiner, decreases.

6. The display device according to claim 5 , wherein said signal converter is configured, for each of the lines of the matrix, to convert the maximum luminance signal, determined by said signal determiner, to a signal having a highest gray level in accordance with a conversion rate, and to convert an other video signal in accordance with the conversion rate.

7. The display device according to claim 1 , wherein each of said plurality of display devices comprises an organic electroluminescent element.

8. The display device according to claim 1 , further comprising:

a plurality of gate lines, each provided for one of the lines of the matrix; and

a plurality of data lines arranged orthogonal to the plurality of gate lines,

wherein each of said plurality of display elements is arranged at a crossing point of one of said plurality of gate lines and one of said plurality of data lines,

said signal output is configured to output the converted video signal to each of said plurality of data lines, and

said scanner is configured to output the scanning signal to each of said plurality of gate lines.

9. The display device according to claim 8 ,

wherein said signal output is configured to alternately output the converted video signal and a non-video signal to said display via each of said plurality of data lines, and

said scanner includes:

a first scanner configured to output a first scanning signal to the display for each of the lines of the matrix in a line-sequential order in synchronization with the converted video signal that is output by said signal output to said display; and

a second scanner configured to output a second scanning signal to the display for each of the lines of the matrix in synchronization with the non-video signal output by said signal output, such that the non-video signal is input to said plurality of display elements of each of the lines of the matrix in accordance with the proportion of the single frame period of each of the lines of the matrix.

10. The display device according to claim 9 ,

wherein said display includes a plurality of light-emitting pixels arranged in the matrix,

each of said plurality of light-emitting pixels includes:

one display element of said plurality of display elements; and

a driver electrically connected to said one display element that determines emission of the light by said one display element, and

the non-video signal output by said signal output electrically disconnects said driver and said one display element.

11. The display device according to claim 8 ,

wherein said display includes a plurality of light-emitting pixels arranged in a matrix,

each of said plurality of light-emitting pixels includes:

one display element of said plurality of display elements;

a capacitor having a first electrode and a second electrode;

a driver electrically connected to said one display element that determines emission of the light by said one display element, said driver being a thin-film transistor having a gate electrode electrically connected to said second electrode of said capacitor; and

a control line electrically connected to said scanner that controls an electric potential of said first electrode of said capacitor,

said signal output is configured to output the converted video signal to said display via each of said plurality of data lines, and

said scanner includes:

a first scanner configured to output a first scanning signal in a line-sequential order in synchronization with the converted video signal that is output by said signal output to said display; and

a second scanner configured to output a second scanning signal to each of said plurality of light-emitting pixels for changing an electric potential of said control line to turn OFF said driver via said control line in accordance with the proportion of the single frame period.

12. A method for driving a display device, the display device including a display that includes a plurality of display elements arranged in lines of a matrix, the plurality of display elements each configured to emit light based on a video signal, said method comprising:

determining, for each line of the lines of the matrix, a proportion of a single frame period during which each of the plurality of display elements of a corresponding line of the lines of the matrix is not to emit the light;

converting an amplitude of the video signal for each of the lines of the matrix according to the proportion determined for each of the lines of the matrix;

outputting the video signal converted according to the proportion determined for each of the lines of the matrix to the display as a converted video signal; and

outputting a scanning signal to the display for each of the lines of the matrix for inputting the converted video signal to the plurality of display elements of each of the lines of the matrix based on the proportion determined for each of the lines of the matrix.

13. The method for driving the display device according to claim 12 ,

wherein the converted video signal is output to the display alternately with a non-video signal, and

the scanning signal includes:

a first scanning signal that is output to the display for each of the lines of the matrix in a line-sequential order in synchronization with the converted video signal that is output to the display; and

a second scanning signal that is output to the display for each of the lines of the matrix in synchronization with the non-video signal that is output to the display, such that the non-video signal is input to the plurality of display elements of each of the lines of the matrix in accordance with the proportion of the single frame period of each of the lines of the matrix.

14. The method for driving the display device according to claim 12 ,

wherein the display includes a plurality of light-emitting pixels arranged in the matrix, each of the plurality of light-emitting pixels includes:

one display element of the plurality of display elements;

a capacitor having a first electrode and a second electrode;

a driver having a gate electrode electrically connected to the second electrode of the capacitor, the driver determining emission of the light by the one display element; and

a control line for controlling an electric potential of the first electrode of the capacitor, and

the scanning signal includes:

a first scanning signal that is output in a line-sequential order in synchronization with the converted video signal that is output to the display; and

a second scanning signal that is output to each of the plurality of light-emitting pixels for changing an electric potential of the control line to turn OFF the driver via the control line in accordance with the proportion of the single frame period.