| 摘要 |
<p>Disclosed is a programmable Gamma circuit for a drive system of a liquid crystal display. The circuit comprises: first to nth digital-to-analogue converters for receiving data from a time-sequence controller of the liquid crystal display and converting same into an analogue signal; first to nth operation amplifiers, each operation amplifier being connected to a corresponding digital-to-analogue converter and used for amplifying the analogue signal to serve as a pixel grey scale reference voltage; and first (R1) to fifth resistors (R5) which are connected to each other in series, wherein the operating voltage (VAA) obtained by converting the reference voltage by a voltage converter of the liquid crystal display is input to one end of the first resistor (R1), one end of the fifth resistor (R5) is connected to the ground (GND), the voltage (VAA1) between the first resistor (R1) and the second resistor (R2) is respectively input to the power supply terminals of the former n/2 operation amplifiers, the voltage (VAA2) between the second resistor (R2) and the third resistor (R3) is respectively input to the ground terminals of the former n/2operation amplifiers, the voltage (VAA3) between the third resistor (R3) and the fourth resistor (R4) is respectively input to the power supply terminals of the latter n/2operation amplifiers, and the voltage (VAA4) between the fourth resistor (R4) and the fifth resistor (R5) is respectively input to the ground terminals of the latter n/2operation amplifiers.</p> |
