Flat display device and method of driving the same
AssigneeToshiba Matsushita Display Technology Co., Ltd.
InventorKouhei Kinoshita
Life of this patent
Estimating the term…
Abstract
An object of the present invention is to provide a flat display device which achieves an excellent and stable display even when the periodicity of voltage polarity is switched at the beginning of a frame at the time of driving a signal line while providing a periodicity of every M scanning lines to the voltage polarity of signal lines in each frame. A control circuit 22 controls so as to provide a voltage polarity of the final line in the periodicity of every four scanning lines to a signal line prior to driving a signal line corresponding to the first scanning line Y(1) at the beginning of a frame.
Claims4
A flat display device, characterized by comprising:
- a pixel display part in which a pixel is disposed at each intersection between multiple rows of scanning lines and multiple columns of signal lines;
- a driver circuit which provides a video signal through a video signal line;
- an analog switch circuit that connects a signal line selected from N signal lines (N is an integer equal to or greater than 2) to the video signal line for each of groups in which each of the video signal lines from the driver circuit corresponds to N signal lines;
- and
- a control circuit which controls to drive the scanning lines and controls the driver circuit and the analog switch circuit,
- wherein the control circuit further controls to drive a signal line while providing a periodicity of every M scanning lines (M is an even number) of a voltage polarity of signal lines in each frame, and
- performs a preliminary drive of signal lines prior to providing a video signal to the signal line selected by the analog switch circuit corresponding to the first scanning line at the beginning of a frame, and the preliminary drive provides a polarity signal from the driver circuit to the video signal line and connects the signal line selected by the analog switch circuit to the video signal line sequentially to provide a voltage polarity of a final scanning line with the periodicity of every M lines in a condition that a drive of the scanning lines is stopped, and
- the voltage polarity of the polarity signal of the preliminary drive is set the same as the voltage polarity of the polarity signal of the final scanning line with the periodicity of every M lines.
A method of driving a flat display device of a multi-selection drive method, the flat display device including a pixel display part in which a pixel is disposed at each intersection between multiple rows of scanning lines and multiple columns of signal lines, the flat display device being adapted to provide a video signal to a plurality of video signal lines and to selectively switch and connect the signal line by an analog switch, N signal lines (N is an integer equal to or greater than 2) corresponding to the each of video signal lines, the method comprising:
- driving a signal while providing a periodicity of every M scanning lines (M is an even number) of a voltage polarity of the signal lines in each frame;
- performing a preliminary drive of signal lines prior to providing a video signal to the signal lines selected by the analog switch circuit corresponding to the first scanning line at the beginning of a frame, the preliminary drive providing a polarity signal from the driver circuit to the video signal line and connecting the signal line selected by the analog switch circuit to the video signal line sequentially to provide a voltage polarity of a final scanning line with the periodicity of every M lines in a condition that a drive of the scanning lines is stopped;
- and
- the voltage polarity of the polarity signal of the preliminary drive is set the same as the voltage polarity of the polarity signal of the final scanning line with the periodicity of every M lines.
Dependencies are inferred from the claim text.