Grayscale voltage generation device, display panel driver and display

A grayscale voltage generation device which has first and second modes, comprising:

• a first line;
• a second line;
• a first selector for receiving a first reference voltage having a first voltage value, a second reference voltage having a second voltage value, a third reference voltage having a third voltage value and a fourth reference voltage having a fourth voltage value, supplying the first reference voltage to the first line and the second reference voltage to the second line in the first mode, and supplying the third reference voltage to the first line and the fourth reference voltage to the second line;
• and
• a plurality of serial digital analog converters (DACs), each of which receives grayscale information representing a grayscale level and generates a grayscale voltage having a voltage value corresponding to the grayscale information using the reference voltages supplied to the first and second lines,
• wherein
• the first reference voltage has negative polarity with respect to the second reference voltage, and
• the third reference voltage has negative polarity with respect to the fourth reference voltage.

A grayscale voltage generation device comprising:

• a first line to which a first reference voltage having a first voltage value is supplied;
• a second line to which a second reference voltage having a second voltage value is supplied;
• a third line to which a third reference voltage having a third reference value is supplied;
• and
• a plurality of serial digital analog converters (DACs),
• wherein the plurality of serial DACs include first and second serial DACs,
• the first serial DAC receives first grayscale information representing a first grayscale level and generates a first grayscale voltage having a voltage value corresponding to the first grayscale information using the reference voltages supplied to the first and second lines,
• the second serial DAC receives second grayscale information representing a second grayscale level and generates a second grayscale voltage having a voltage value corresponding to the second grayscale information using the reference voltages supplied to the second and third lines,
• the first reference voltage has negative polarity with respect to the second reference voltage, and
• the third reference voltage has positive polarity with respect to the second reference voltage.

A grayscale voltage generation device comprising:

• a first line to which a first reference voltage having a first voltage value is supplied;
• a second line to which a second reference voltage having a second voltage value is supplied;
• a third line to which a third reference voltage having a third reference value is supplied;
• a fourth line to which a fourth reference voltage having a fourth reference value is supplied;
• and
• a plurality of serial digital analog converters (DACs),
• wherein the plurality of serial DACs include first and second serial DACs,
• the first serial DAC receives first grayscale information representing a first grayscale level and generates a first grayscale voltage having a voltage value corresponding to the first grayscale information using the reference voltages supplied to the first and second lines,
• the second serial DAC receives second grayscale information representing a second grayscale level and generates a second grayscale voltage having a voltage value corresponding to the second grayscale information using the reference voltages supplied to the third and fourth lines,
• the first reference voltage has negative polarity with respect to the second reference voltage, and
• the third reference voltage has negative polarity with respect to the fourth reference voltage.

A grayscale voltage generation device comprising:

• a first line to which a first reference voltage having a first voltage value is supplied;
• a second line to which a second reference voltage having a second voltage value is supplied;
• and
• a plurality of serial digital analog converters (DACs),
• wherein each of the plurality of serial DACs receives grayscale information representing a grayscale level and generates a grayscale voltage having a voltage value corresponding to the grayscale information using the reference voltages supplied to the first and second lines, and
• each of the plurality of serial DACs includes
• a first input terminal for receiving the first reference voltage;
• a second input terminal for receiving the second reference voltage;
• a first switch for connecting the first input terminal with a first node or connecting the second input terminal with the first node;
• a first capacitor connected between the first node and the second input terminal;
• a second switch for connecting/disconnecting the first node with/from a second node;
• and
• a second capacitor connected between the second node and the second input terminal.

A display panel driver for driving a display panel comprising:

• a first line;
• a second line;
• a selector for receiving a first reference voltage having a first voltage value, a second reference voltage having a second voltage value and a third reference voltage having a third voltage value, supplying the first reference voltage to the first line and the second reference voltage to the second line in a first mode, and supplying the third reference voltage to the first line and the second reference voltage to the second line in a second mode;
• a plurality of serial digital analog converters (DACs);
• and
• a plurality of output terminals,
• wherein each of the plurality of serial DACs receives grayscale information representing a grayscale level and generates a grayscale voltage having a voltage value corresponding to the grayscale information using the reference voltages supplied to the first and second lines, and
• each of the plurality of output terminals outputs either one of the grayscale voltages generated by the plurality of serial DACs.

A display comprising:

• a first line;
• a second line;
• a selector for receiving a first reference voltage having a first voltage value, a second reference voltage having a second voltage value and a third reference voltage having a third voltage value, supplying the first reference voltage to the first line and the second reference voltage to the second line in a first mode, and supplying the third reference voltage to the first line and the second reference voltage to the second line in a second mode;
• a plurality of serial digital analog converters (DACs);
• and
• a display panel,
• wherein each of the plurality of serial DACs receives grayscale information representing a grayscale level and generates a grayscale voltage having a voltage value corresponding to the grayscale information using the reference voltages supplied to the first and second lines, and
• the display panel receives the grayscale voltages generated by the plurality of serial DACs.