Method of driving display panel and drive for carrying out same

A drive of a display panel for driving (n×m) pieces of display elements each disposed at respective crossover points of a matrix, formed of n rows of scanning lines and m columns of data lines, having an anode thereof, connected to the respective data lines and a cathode thereof, connected to the respective scanning lines, said drive comprising:

• first switching means for changing over between connection of the respective data lines to the side of respective variable current sources and connection thereof to a grounding side;
• second switching means for changing over a potential of the respective scanning lines between a power supply potential and a grounding potential;
• driving means for controlling the first switching means and second switching means correspondingly to input data;
• comparison means provided in each of the data lines, for outputting a control signal by comparing a reference voltage from reference voltage generation means with a potential of the respective data lines, and
• current control means for controlling a current of the variable current source provided in each of the data lines based on results of comparison executed by the respective comparison means.

A drive of a display panel for driving (n×m) pieces of display elements each disposed at respective crossover points of a matrix, formed of n rows of scanning lines and m columns of data lines, having an anode thereof, connected to the respective data lines and a cathode thereof, connected to the respective scanning lines, said drive comprising:

• first switching means for changing over between connection of the respective data lines to the side of respective variable current sources and connection thereof to a grounding side;
• second switching means for changing over a potential of the respective scanning lines between a power supply potential and a grounding potential;
• driving means for controlling the first switching means and second switching means correspondingly to input data;
• detection means for detecting the number of the display elements for each of the scanning lines in a succeeding display period on the basis of the input data;
• assumption means for assuming a voltage of the data line for each of the data lines on the basis of the input data and the number of the display elements;
• and
• current correction means for correcting a current value of the respective variable current sources on the basis of results of respective comparison means for comparing the voltage of the respective data lines as assumed with a predetermined reference voltage.

A drive of a display panel for driving (n×m) pieces of display elements each disposed at respective crossover points of a matrix, formed of n rows of scanning lines and m columns of data lines, having an anode thereof, connected to the respective data lines and a cathode thereof, connected to the respective scanning lines, said drive comprising:

• first switching means for changing over between connection of the respective data lines to the side of respective variable current sources and connection thereof to a grounding side;
• second switching means for changing over a potential of the respective scanning lines between a power supply potential and a grounding potential;
• a drive control circuit for controlling the first switching means and second switching means correspondingly to input data;
• a comparator provided in each of the data lines for outputting a control signal by comparing a reference voltage from a voltage regulator with a potential of the respective data lines;
• and
• a current control circuit for controlling a current of the variable current source provided in each of the data lines on the basis of results of comparison by the respective comparators.

A drive of a display panel for driving (n×m) pieces of display elements each disposed at respective crossover points of a matrix, formed of n rows of scanning lines and m columns of data lines, having an anode thereof, connected to the respective data lines and a cathode thereof, connected to the respective scanning lines, said drive comprising:

• first switching means for changing over between connection of the respective data lines to the side of respective variable current sources and connection thereof to a grounding side;
• second switching means for changing over a potential of the respective scanning lines between a power supply potential and a grounding potential;
• a drive control circuit for controlling the first switching means and second switching means correspondingly to input data;
• a light-emitting bit number detection circuit for detecting the number of the display elements for each of the scanning lines, in a succeeding display period on the basis of the input data;
• a VO detection circuit for assuming a voltage of the data line, for each of the data lines, in the succeeding display period on the basis of the input data and the number of the display elements;
• and
• a current correction circuit for correcting a current value of the respective variable current sources on the basis of results of a digital comparator for comparing the voltage of the respective data lines as assumed with a predetermined reference voltage.