Method of driving display panel and panel display apparatus

A panel display apparatus equipped with a display panel having plural cells that carry out discharge for light emission selectively, wherein:

• a display luminance is determined by a number of times discharge for light emission is performed;
• a display frame of a screen is comprised of plural subframes each of which is assigned a number of times discharge for light emission is performed according to a specified luminance relation;
• and a representation with gray scale is performed by combining the subframes that display according to an intensity of an input image signal for each cell, comprising a gain control circuit that controls a gain of the input image signal, a data converter that loads display data for each said display frame of the input image signal on a frame memory equipped with a display plane corresponding to the plural subframes, and reads from each said display plane in synchronization with a display of the display panel, a driver controller to control a driver that applies drive signals to each electrode of the display panel, and a power control circuit to control power consumption by both a control of a total number of times discharge for light emission is performed in the display frame and a control of the gain of the input image signal,
• wherein the power control circuit first reduces the total number of times discharge for light emission is performed with the gain being set to a constant value, and then reduces the gain after the total number of times discharge for light emission is performed is reduced to a threshold value, with the total number of times discharge for light emission is performed being fixed to the threshold value.

A method of driving a display panel defined by plural discharge cells to provide light emission by selective discharges of the plural discharge cells in plural subframes, a display frame of a screen comprising the plural subframes, a display is presented by combining the plural subframes according to an intensity of an input image signal for each of the plural discharge cells in the display frame, comprising:

• controlling a power consumption of the display panel by coordinated controlling in the display frame of both a total number of discharges of the plural discharge cells and a gain of the input image signal, wherein the power consumption of the display panel is controlled to less than or equal to a first power consumption level, said controlling comprises,
• when a display load ratio is at or below a first value corresponding to the power consumption of the display panel at or below a first power consumption level, operating, in the display frame, the total number of discharges of the plural discharge cells at a first level and the gain of the input image signal at a first gain value, and
• when a display load ratio is above the first value corresponding to the power consumption of the display panel being above the first power consumption level when the total number of discharges of the plural discharge cells is set to the first level and the gain of the input image signal is set to the first gain value, operating, in the display frame, at one of the total number of discharges of the plural discharge cells ranging between the first level and a second level, the second level being less than the first level, and the gain of the input image signal being set at the first gain value and the total number of discharges of the plural discharge cells being set at the second level and the gain of the input image signal being set at less than the first gain value, thereby ensuring the power consumption of the display panel is less than or equal to the first power consumption level.

A panel display apparatus with a display panel having plural discharge cells to provide light emission by selective discharge of the plural discharge cells in plural subframes, a display frame of a screen comprising the plural subframes, each of the plural subframes being assigned a number of discharges of the plural discharge cells to be performed according to a specified luminance relation;

• a representation defined by gray scale levels is performed by combining the plural subframes such that a display is presented according to an intensity of an input image signal for each of the plural discharge cells in the display, comprising:
• a frame memory with a display plane corresponding to the plural subframes;
• a gain control circuit to control a gain of the input image signal;
• a data converter to load display data of the input image signal for each said display frame on the frame memory and to read from each said display plane in synchronization with the display of the display panel;
• a driver controller to control a driver that applies drive signals to each electrode of the display panel;
• and
• a power control circuit to control power consumption by coordinated control, in the display frame, of both a total number of discharges of the plural discharge cells and the gain of the input image signal, wherein the power control circuit first reduces the total number of discharges of the plural discharge cells with the gain being set to a constant value, and then reduces the gain after the total number of discharges of the plural discharge cells is reduced to a threshold value, with the total number of discharges of the plural discharge cells being fixed to the threshold value.

A method of driving a display panel equipped with plural cells that perform discharge for light emission selectively, the display panel having a display luminance thereof determined by a number of times the discharge for light emission is performed, a display frame comprising plural subframes, each of the subframes being assigned a portion of the number of times the discharge for light emission is performed by combining the subframes in which a display is presented according to an intensity of an input image signal for each of the plural cells, and a control of power consumption performed by both a control of a total number of times the discharge for light emission is performed, and a control of a gain of the input image signal, comprising controlling of the power consumption by:

• controlling the total number of times discharge for light emission is performed according to a display load ratio with the gain being set to a constant value;
• and
• controlling the gain of the input image signal according to a display load ratio with the total number of times the discharge for light emission is performed being set to a constant value, the controlling of the total number of times discharge for light emission is performed when the display load ratio is less than a predetermined value and the controlling of the gain of the input image signal is performed when the display load ratio is larger than the predetermined value.

A method of driving a display panel having plural discharge cells to provide light emission by selective discharge of the plural discharge cells in plural subframes, a display frame of a screen comprising the plural subframes, each of the plural subframes being assigned a number of discharges of the plural discharge cells, the display panel having a display luminance thereof determined by the number of discharges of the plural discharge cells and by a combination of the plural subframes in which a display is presented according to an intensity of an input image signal for each of the plural discharge cells, and having a control of power consumption performed by both a control of a total number of discharges of the plural discharge cells, and a control of a gain of the input image signal, comprising:

• controlling the total number of discharges of the plural discharge cells according to a display load ratio with the gain being set to a constant value;
• and
• controlling the gain of the input image signal according to a display load ratio with the total number of discharges of the plural discharge cells being set to a constant value, the controlling of the total number of discharges of the plural discharge cells being performed when the display load ratio is less than a predetermined value and the controlling of the gain of the input image signal being performed when the display load ratio is larger than the predetermined value.