Driving method of light emitting diodes

摘要

A driving method is applied to a driving switch having a first terminal, a second terminal coupled to a first light emitting diode (LED), and a control terminal. First, supply a reset voltage to the control terminal. When the second terminal electrically connects with the control terminal and the first terminal receives a precompensation voltage, the difference between the voltage at the control terminal and the preset voltage is equal to the threshold voltage of the driving switch. When the second terminal electrically connects with the control terminal and the first terminal receives a data voltage, the difference between the voltage at the control terminal and the data voltage is equal to the threshold voltage of the driving switch. When the first terminal receives a power voltage, a driving current is generated according to the voltage at the control terminal and the power voltage to drive the LED.

主权项

1. A driving method applied to a first driving switch which has a first terminal, a second terminal, and a control terminal, the second terminal of the first driving being coupled with a first light emitting diode (LED), the driving method comprising:
supplying a reset voltage to the control terminal of the first driving switch during a first time period in a precompensation stage; during a second time period in the precompensation stage, selectively and electrically connecting the second terminal of the first driving switch to the control terminal of the first driving switch and supplying a precompensation voltage to the first terminal of the first driving switch, to make a difference between a voltage at the control terminal of the first driving switch and the precompensation voltage be equal to a first threshold voltage of the first driving switch; during a third time period in an execution stage, selectively and electrically connecting the second terminal of the first driving switch with the control terminal of the first driving switch and supplying a data voltage to the first terminal of the first driving switch, to make a difference between the voltage at the control terminal of the first driving switch and the data voltage be equal to the first threshold voltage of the first driving switch; and after the third time period, supplying a power voltage to the first terminal of the first driving switch and electrically connecting the second terminal of the first driving switch to the first LED, to make the first driving switch output a driving current to drive the first LED according to the voltage at the control terminal of the first driving switch and the power voltage.