Patent ID: 8068078

Claim:
An electro-luminescence display, comprising: a plurality of drive voltage supply lines; a plurality of compensation voltage supply lines; EL cells at each crossing of a plurality of data lines and a plurality of gate lines in a matrix, wherein the EL cells emit light in response to currents applied from the drive voltage supply lines; driving thin film transistors (TFTs) connected between the EL cells and compensation voltage supply lines that control the current applied to the EL cells; and a bias switch, connected between a N−1th compensation voltage supply line of the plurality of compensation voltage supply lines and a control terminal of a Nth driving TFT connected to a Nth compensation voltage supply line of the plurality of compensation voltage supply lines to apply a negative bias voltage to the Nth driving TFT connected to the Nth compensation voltage supply line, thereby compensating for a change of threshold voltage of the Nth driving TFT when a scan pulse is supplied to a N−1th gate line of the plurality of gate lines, wherein the bias switch is controlled by the scan pulse supplied to the N−1th gate line, and wherein the bias switch includes: a control terminal connected to the N−1th gate line; a first input terminal connected to the N−1th compensation voltage supply line; and a second input terminal connected to the control terminal of the Nth driving TFT that is connected to the Nth compensation voltage supply line.