Electrical – voltage levels for lcd display


i intend to use WF101FSYAPLNGO display model of winstar, in its data sheet AVDD, VGH,VGL VDD, VDDT voltages are given, can some one help to find the difference between AVDD and VDD, is AVDD meant for back light control? i am using conga ma-5 n4200 processor for my project, its design guide specifies that back light can be controlled by PWM or analog voltage via a i2c DAC. in the said display's datasheet they don't specify about back light control method.
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Best Answer

Typically AVDD is the power supply for the analog part of the circuit. They are external so that you can add filters to reduce noise.