Driving circuit for display apparatus, and method of driving display apparatus

A driving circuit for a display apparatus having a display panel, which comprises a plurality of scanning electrodes and a plurality of signal electrodes arranged in a matrix shape, and a plurality of EL (Electroluminescence) elements connected to the scanning electrodes and the signal electrodes at intersections thereof, said driving circuit comprising:

• a driving means for supplying a constant current driving signal to said signal electrodes in correspondence with an input signal, to drive said display panel;
• a detection means for detecting a voltage drop in a forward direction of the EL element, and outputting a detection signal which indicates the detected voltage drop;
• a control means for controlling the constant current driving signal, which is supplied from said driving means, to have a predetermined current value for maintaining said EL elements with respect to said EL elements in an initial usage condition and controlling the constant current driving signal to have an increased current value larger than the predetermined current value for keeping the luminance of said EL elements constant by compensating a voltage drop component of said EL elements due to degradation of said EL elements with respect to said EL elements in a used condition, in correspondence with the detection signal from said detection means;
• and
• a temperature detection means for detecting a temperature of said display panel, said control means correcting the detected voltage drop of the detection signal on the basis of the detected temperature.

A method of driving a display apparatus having a display panel, which comprises a plurality of scanning electrodes and a plurality of signal electrodes arranged in a matrix shape, and a plurality of EL (Electroluminescence) elements connected to the scanning electrodes and the signal electrodes at intersections thereof, said method comprising the steps of:

• supplying a constant current driving signal to said signal electrodes in correspondence with an input signal, to drive said display panel by a driving device;
• detecting a voltage drop in a forward direction of the EL element, and outputting a detection signal which indicates the detected voltage drop;
• controlling voltage, which is supplied to said driving device, to have a predetermined voltage value for maintaining said driving device with respect to said EL elements in an initial usage condition and controlling the voltage to have an increased voltage value larger than the predetermined voltage value for compensating a voltage drop component of said EL elements due to degradation of said EL elements with respect to said EL elements in a used condition, in correspondence with the detection signal;
• detecting a temperature of said display panel;
• and
• correcting the detected voltage drop of the detection signal on the basis of the detected temperature.

A method of driving a display apparatus having a display panel, which comprises a plurality of scanning electrodes and a plurality of signal electrodes arranged in a matrix shape, and a plurality of EL (Electroluminescence) elements connected to the scanning electrodes and the signal electrodes at intersections thereof, said method comprising the steps of:

• supplying a constant current driving signal to said signal electrodes in correspondence with an input signal, to drive said display panel;
• detecting a voltage drop in a forward direction of the EL element, and outputting a detection signal which indicates the detected voltage drop;
• controlling the constant current driving signal to have a predetermined current value for maintaining said EL elements with respect to said EL elements in an initial usage condition and controlling the constant current driving signal to have an increased current value larger than the predetermined current value for keeping the luminance of said EL elements constant by compensating a voltage drop component of said EL elements due to degradation of said EL elements with respect to said EL elements in a used condition, in correspondence with the detection signal;
• detecting a temperature of said display panel;
• and
• correcting the detected voltage drop of the detection signal on the basis of the detected temperature.