AC drive circuit for OLED, drive method and display apparatus

摘要

An AC drive circuit for OLED comprises a light emitting control unit, a charging control unit, a drive unit, a storage unit, a first voltage signal input terminal, a second voltage signal input terminal and a third voltage signal input terminal. The AC drive circuit enables that the current flowing in an OLED is independent of the internal resistance of the circuit, thus the brightness of the OLED will not be influenced by the internal resistance of the circuit. Meanwhile, the AC drive circuit compensates the threshold voltage of the drive transistor, thus the influence of the threshold voltage of the drive transistor on the current of the OLED for emitting light is eliminated. In addition, the AC drive circuit reversely biases the OLED, thereby the un-recombined carriers accumulated at the light emitting interface inside the OLED and the built-in electrical field formed by these carriers are eliminated.

主权项

1. An AC drive circuit for OLED, comprising:
a storage unit and a drive unit; a first signal input terminal, a second signal input terminal, and a third signal input terminal; a light emitting control unit including:
a light emitting control signal input terminal for inputting a light emitting control signal,a first transistor having a gate electrode thereof connected to the light emitting control signal input terminal, a source electrode thereof connected to the first signal input terminal, and a drain electrode thereof connected to the drive unit, anda fourth transistor having a gate electrode thereof connected to the light emitting control signal input terminal, a source electrode thereof transistor connected to the drive unit, and a drain electrode thereof connected to an anode of the OLED; and a charging control unit including:
a scanning signal input terminal for inputting a scanning signal,a data signal input terminal for inputting a data signal,a second transistor having a gate electrode thereof connected to the scanning signal input terminal, a source electrode thereof connected to the data signal input terminal, and a drain electrode thereof connected to the drain electrode of the first transistor,a third transistor having a gate electrode thereof connected to the scanning signal input terminal, a source electrode thereof connected to the storage unit, and a drain electrode thereof connected to the drive unit, anda fifth transistor having a gate electrode thereof connected to the scanning signal input terminal, a source electrode thereof direct connected to the drain electrode of the fourth transistor, and a drain electrode thereof directly connected to the third signal input terminal, wherein the charging control unit is used for controlling the AC drive circuit to charge the storage unit, wherein the light emitting control unit is used for controlling the AC drive circuit so that the storage unit controls the drive unit to drive an OLED to emit light, and wherein the first signal input terminal is connected with the light emitting control unit and the storage unit, the second signal input terminal is connected with a cathode of the OLED, and the third signal input terminal is connected with the charging control unit.