CIRCUIT FOR SENSING THRESHOLD VOLTAGE OF ORGANIC LIGHT EMITTING DIODE DISPLAY DEVICE

摘要

PURPOSE: A threshold voltage sensing circuit of an organic light emitting diode display device is provided to protect a low voltage driving device within an analog-to-digital converter by scaling and transmitting threshold voltage to low threshold voltage regions less than a specific value through charge sharing. CONSTITUTION: A threshold voltage sensing circuit includes a sample-and-hold unit (200) sampling and holding threshold voltage of pixel of an organic light emitting diode display device. Capacitors for sampling (CS) sample threshold voltage inputted after sensed from the organic light emitting diode. Capacitors for charge sharing (SVT_CS) charge shares the threshold voltage sampled by the capacitor for sampling or independently charges and bypasses the threshold voltage. A plurality of switches switch for sampling operation of the capacitors for sampling and charge sharing of the capacitors for charge sharing.