Patent ID: 7598776
Filing Date: 2009-10-06
Classification: G09G

Abstract:
1. A programming circuit, comprising: an input terminal configured for receiving an external high voltage signal; a driving circuit comprising an electric source input terminal; a switch circuit connected between the input terminal and the electric source input terminal of the driving circuit; and a feedback circuit comprising a control circuit and a comparing circuit comprising a first input terminal, a second input terminal, and an output terminal; wherein the control circuit is connected between the switch circuit and the output terminal of the comparing circuit, the first input terminal of the comparing circuit is connected to the electric source input terminal of the driving circuit, and the second input terminal is connected to a reference voltage source; the comparing circuit compares a voltage of the first input terminal and the reference voltage of the second input terminal, and outputs a signal to the control circuit; the control circuit correspondingly outputs a control signal to turn on or turn off the switch circuit; when the voltage of the first input terminal of the comparing circuit is equal to the reference voltage, the switch circuit is turned on; when the voltage of the first input terminal of the comparing circuit is larger than the reference voltage, the switch circuit is turned off; and when the voltage of the first input terminal of comparing circuit is less than the reference voltage, the switch circuit is turned off.