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Understanding VGH, VGL isone of the kinds used on the suply fed to the panel driver ic ic Sorce Gate driver.Coba driver and we remember about the first vertical circuit-outs on CRT TV which has Vcc supply symmetry + / - * .Sirkit serves to "reinforce ideal op amplitude" or "strengthen the level of" pulses from the vertical oscillator. *. pulses from an oscillator originally only had about 5v amplitude * .Then reinforced vertical ic ole-out so that the amplitude becomes about 24v. *. T...hen required symmetry supply Vcc (+) 12v and Vcc (-) 12v so that the pulse vertically-out canswing between (+) 12v with(-) 12v or it can be said pulses have a level 24v peak-to-peak. *. Here the pulse output from the ic-out vertical def yoke coils connected to then direct voltage to 0v or ground
To drive a LCD pixels takessome kind of pulse. These pulses drive also needs to be strengthened"amplitude" it uses some ofthe "Op-amp" (operational amplifier) contained in ic driver. Here how the Op-amp is also almost similar to ic vertical-outs.*. For Vcc (+) Op-amp usedthe term VGH or Von. *. For Vcc (-) Op-amp is used istilahVgl or Voff. *. Each type panel has VGH and VGL voltages are different. VGL generally range between + 20v to + 40v, while VGL around (-) 5v to (-) 15V. And it also depends on large-small size LCD screen. *. Therefore, the voltage is not symmetrical - so here the op-amp output is not connected to ground as well as the vertical ic-out. So that the output voltage of the VGH and VGL may symmetry, then the outputvoltage is connected to theadaditengah midway between voltages VGH andVGL or called Vcom.
Pulses OE, CPV and STV in the mixer (mixed) and then amplified in amplitude by the Op-amp L4, L5 and L6. *. Pulses whose levels are already great and then called CKV, CKVB, STVP
* .Gate / Row driver set the "on-off" pixel which will be lit alternately at high speed * .Colum driverset the "light-dark" it will be lit pixel. *. Examples pixel RGB here - looks are not connected to ground but to the Vcom voltage.
Where did the voltage VGHand VGL? *. The input voltage to the module T.con generally there are 3.3v, 5v or 12v. *. To get voltage VGH, VGL - normally used circuits called LCD driver IC or Dc-Dc Converter, which is acircuit mini works almost similar to the "switching regulator". *. LCD drivers can be used to raise or to lower the input voltage. *. LCD drivers generally use an ic who already are designed for things like this, misalnyaMAX17113, TPS65160 . *. Except for generating voltage VGH, VGL - LCD driver is also used to produce other voltages.
Pictured above is an example of an LCD driver ic, which gets input 12v dandigunakan to generate output voltages: *. Vs 15V* .Vgh 23v * .Vgl (-) 5v *.Vlogic 3.3v