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

A signal drive circuit which drives signal lines of an electro-optical device having pixels specified by a plurality of scan lines and a plurality of signal lines which intersect each other, based on image data, the signal drive circuit comprising:

• a line latch which latches the image data in a horizontal scanning cycle;
• drive voltage generation circuit which generates a drive voltage for each signal line based on the image data latched in the line latch;
• signal line drive circuit which drives each signal line based on the drive voltage generated by the drive voltage generation circuit;
• shift register which temporarily holds image data necessary for one horizontal scan to be latched by the line latch, and includes flip-flops connected to each other and corresponding to the signal lines;
• data transfer circuit provided in units of blocks to receive and transfer image data to flip-flops in an adjacent block when high impedance control is performed on a block in which the data transfer circuit is provided, each block including a given plural number of the signal lines;
• and
• control instruction data holding circuit which holds control instruction data in units of blocks,
• wherein high impedance control is performed for an output of the signal line drive circuit in units of blocks, based on the control instruction data.

A signal drive circuit which drives signal lines of an electro-optical device having pixels specified by a plurality of scan lines and a plurality of signal lines which intersect each other, based on image data, the signal drive circuit comprising:

• a line latch which latches the image data in a horizontal scanning cycle;
• a drive voltage generation circuit which generates a drive voltage for each signal line based on the image data latched in the line latch;
• a signal line drive circuit which drives each signal line based on the drive voltage generated by the drive voltage generation circuit;
• a control instruction data holding circuit which holds control instruction data in units of blocks;
• and
• a partial display data holding circuit which holds partial display data indicating permission for or prohibition against output to the signal lines on the basis of image data in units of blocks, each block including a given plural number of the signal lines;
• wherein the signal line drive circuit includes:
• an impedance conversion circuit which performs impedance conversion for the drive voltage generated by the drive voltage generation circuit to output the converted drive voltage to each of the signal lines;
• and
• a non-display-level voltage supply circuit which supplies a non-display-level voltage to the signal lines;
• wherein high impedance control is performed for an output of the signal line drive circuit in units of blocks, based on the control instruction data;
• wherein the impedance conversion circuit in one or more blocks in which no high impedance control is performed for the output of the signal line drive circuit, performs impedance conversion for the drive voltage and output the converted drive voltage to the signal lines in a block in which output is permitted by the partial display data, and
• puts the signal lines in a block in which output is prohibited by the partial display data, into a high impedance state;
• and
• wherein the non-display-level voltage supply circuit in one or more blocks in which no high impedance control is performed for the output of the signal line drive circuit, puts the signal lines in a block in which output is permitted by the partial display data, into a high impedance state, and
• supplies a non-display-level voltage to the signal lines in a block in which output is prohibited by the partial display data.

A display device comprising:

• an electro-optical device having pixels specified by a plurality of scan lines and a plurality of signal lines which intersect each other;
• a scanning drive circuit which drives the scan lines;
• and
• a signal drive circuit which drives the signal lines based on image data,
• wherein the signal drive circuit comprises;
• a line latch which latches the image data in a horizontal scanning cycle;
• a drive voltage generation circuit which generates a drive voltage for each signal line based on the image data latched in the line latch;
• and
• a signal line drive circuit which drives each signal line based on the drive voltage generated by the drive voltage generation circuit,
• wherein the signal line drive circuit determines whether to perform high impedance control for an output of the signal line drive circuit in units of blocks, each block including a given plural number of the signal lines, and
• wherein a block in which high impedance control is performed for an output of the signal line drive circuit in the signal drive circuit is changed depending on the relationship between disposition of the signal lines in the electro-optical device and disposition of the signal line drive circuit in the signal drive circuit.

An electro-optical device comprising:

• pixels specified by a plurality of scan lines and a plurality of signal lines which intersect each other;
• a scanning drive circuit which drives the scan lines;
• and
• a signal drive circuit which drives the signal lines based on image data,
• wherein the signal drive circuit comprises;
• a line latch which latches the image data in a horizontal scanning cycle;
• a drive voltage generation circuit which generates a drive voltage for each signal line based on the image data latched in the line latch;
• and
• a signal line drive circuit which drives each signal line based on the drive voltage generated by the drive voltage generation circuit,
• wherein the signal line drive circuit determines whether to perform high impedance control for an output of the signal line drive circuit in units of blocks, each block including a given plural number of the signal lines, and
• wherein a block in which high impedance control is performed for an output of the signal line drive circuit in the signal drive circuit is changed depending on the relationship between disposition of the signal lines and disposition of the signal line drive circuit in the signal drive circuit.