LIGHT EMITTING DIODE PIXEL UNIT CIRCUIT AND DISPLAY PANEL

摘要

A LED pixel unit circuit and a display panel. The LED pixel unit circuit comprises a driving module (31), the driving module (31) includes a driving TFT (DTFT), a first switching element (T1), a first capacitor (C1), a second capacitor (C2) and a driving control unit (311), wherein the driving control unit (311) comprises a matching TFT (T3) whose threshold voltage (Vth3) is matched with the threshold voltage (Vth) of the driving TFT (DTFT), is located between the positive voltage (VDD) output terminal of the power source and the first node (P1), and is configured to control charging and discharging of the second capacitor (C2) so as to hold the threshold voltage (Vth3) of the matching TFT (T3) and thereby compensate for the threshold voltage (Vth) of the driving TFT (DTFT). The LED pixel unit circuit can solve the problem of brightness non-uniformity of the display panel due to different threshold voltages of the TFTs, and also integrate a touch screen circuit (32) into the pixel unit circuit to realize a touch function of the display panel

主权项

1. A LED pixel unit circuit comprising a driving module and a LED, the driving module comprising a driving TFT, a first switching element, a first capacitor, a second capacitor and a driving control unit, wherein
the gate of the driving TFT is connected to a first node, the source of the driving TFT is connected to a positive voltage output terminal of a power source, and the drain of the driving TFT is connected to the anode of the LED; the cathode of the LED is connected to a negative voltage output terminal of the power source; the first capacitor is located between the first node and the first switching element; the second capacitor is located between the positive voltage output terminal of the power source and the first node; the first switching element is connected between the first capacitor and a data line in series; and the driving control unit comprises a matching TFT whose threshold voltage is matched with the threshold voltage of the driving TFT, is located between the positive voltage output terminal of the power source and the first node, and is configured to control charging and discharging of the second capacitor so as to hold the threshold voltage of the matching TFT and thereby compensate for the threshold voltage of the driving TFT.