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

摘要

The present invention relates to a technique for outputting threshold voltages by properly changing the threshold voltages such that the threshold voltages can protect low-voltage driving elements within an analog to digital converter when the threshold voltages of an OLED display panel are sensed and outputted to the analog to digital converter. The present invention comprises: a sampling capacitor which samples threshold voltages sensed and inputted from an organic light-emitting diode on a display panel; a charge-sharing capacitor which charges and shares the threshold voltages sampled from the sampling capacitor, or solely charges the threshold voltages to bypass the threshold voltages; and a sample-and-hold unit which has a plurality of switches for performing switching operations for the sampling operation of the sampling capacitor and the charging and the sharing of the charge-sharing capacitor, and scales the threshold voltages to threshold voltage areas having a certain value or less.

主权项

1. A threshold voltage sensing circuit of an organic light emitting diode (OLED) display device including an OLED, comprising:
a sampling capacitor configured to sample a threshold voltage of the OLED; a charge-share capacitor configured to charge-share the voltage sampled in the sampling capacitor; and a comparator configured to compare the variation range of the threshold voltage to a reference value, wherein when the variation range of the threshold voltage is larger than the reference value, the threshold voltage is stored in the sampling capacitor and the charge-share capacitor to make the variation range of the threshold voltage smaller than the reference value.