Programmable Gamma Circuit of Liquid Crystal Display Driving System

A programmable gamma circuit of liquid crystal display driving system, comprising:

• a first digital-to-analog converter to a n-th digital-to-analog converter, which receive a data used to generate a reference voltage of a pixel grayscale from a timing controller of the liquid crystal display driving system and convert the data to an analog signal;
• a first operational amplifier to a n-th operational amplifier, each operational amplifier being connected to a corresponding digital-to-analog converter within the first digital-to-analog converter to the n-th digital-to-analog converter, the analog signal converted by the first operational amplifier converter to the n-th operational amplifier converter being the reference voltage of the pixel grayscale Vout1 to Voutn, wherein, n is even;
• a first resistor to a fifth resistor, which are connected in series with each other, the operating voltage VAA obtained by a voltage converter of the liquid crystal display driving system converting the reference voltage being input to one end of the first resistor, and one end of the fifth resistor being grounded;
• wherein, the voltage VAA1 between the first resistor and the second resistor is input respectively to the power supply terminals of the first n/2 operational amplifiers, the voltage VAA2 between the second resistor and the third resistor is input respectively to the ground terminals of the first n/2 operational amplifiers, the voltage VAA3 between the third resistor and the fourth resistor is input respectively to the power supply terminals of the last n/2 operational amplifier, and the voltage VAA4 between the fourth resistor and the fifth resistor is input respectively to the ground terminals of the last n/2 operational amplifier.