Signal drive circuit, display device, electro-optical device, and signal drive method

A display device comprising:

• a display panel including a plurality of pixels defined by a plurality of scan lines and a plurality of signal lines crossing each other;
• a scan drive circuit for scanning and driving the scan lines;
• and
• a signal drive circuit for driving the signal lines based on image data,
• wherein the signal drive circuit includes:
• a line latch for latching the image data for a horizontal scan period;
• a drive voltage generating section for generating drive voltages of the signal lines based on the image data latched by the line latch;
• a signal line drive section for driving the signal lines based on the drive voltages generated by the drive voltage generating section;
• and
• a partial display data holding section for holding partial display data which indicates propriety of output of the drive voltages to the signal lines on a block basis, each block constituting a predetermined number of signal lines, and
• wherein the signal line drive section includes:
• an impedance conversion section for subjecting drive voltages generated by the drive voltage generating section to impedance conversion to output the impedance-converted drive voltages to the signal lines;
• and
• a non-display level voltage supplying section for generating predetermined non-display level voltages on the signal lines, and
• wherein each of the signal lines is driven by one of the impedance conversion section and the non-display level voltage supplying section on a block basis based on the partial display data.

An electro-optical device comprising:

• a plurality of pixels defined by a plurality of scan lines and a plurality of signal lines crossing each other;
• a scan drive circuit for scanning and driving the scan lines;
• and
• a signal drive circuit for driving the signal lines based on image data,
• wherein the signal drive circuit includes:
• a line latch for latching the image data for a horizontal scan period;
• a drive voltage generating section for generating drive voltages of the signal lines based on the image data latched by the line latch;
• a signal line drive section for driving the signal lines based on the drive voltages generated by the drive voltage generating section;
• and
• a partial display data holding section for holding partial display data which indicates propriety of output of the drive voltages to the signal lines on a block basis, each block constituting a predetermined number of signal lines, and
• wherein the signal line drive section includes:
• an impedance conversion section for subjecting drive voltages generated by the drive voltage generating section to impedance conversion to output the impedance-converted drive voltages to the signal lines;
• and
• a non-display level voltage supplying section for generating predetermined non-display level voltages on the signal lines, and
• wherein each of the signal lines is driven by one of the impedance conversion section and the non-display level voltage supplying section on a block basis based on the partial display data.

A signal drive method for a signal drive circuit driving a plurality of signal lines of an electro-optical device including pixels which are defined by a plurality of scan lines and the signal lines crossing each other, comprising the steps of:

• latching the image data for a horizontal scan period;
• generating drive voltages for each of the signal lines based on the latched image data;
• holding partial display data which indicates propriety of output of the drive voltages to the signal lines on a block basis, each block constituting a predetermined number of signal lines;
• subjecting drive voltages generated by the drive voltage generating section to impedance conversion to output the impedance-converted drive voltages to the signal lines on a block basis, when one of the blocks is set to a display area based on the partial display data;
• and
• outputting non-display level voltages from a non-display level voltage supplying section to the signal lines on a block basis, when one of the blocks is set to a non-display area based on the partial display data.