Whats the differences between analog LCD and digital LCD?

 

In the respective of LCD panels, analog LCD has no differences with digital LCD----a voltage signal and timing signal.

The signals connecting to pixel dots must be digital either for digital LCD or for analog LCD.

In the edge of the LCD panel, there are many row driver (IC) and column driver (IC) surrounding there. They are called driver IC. And there is a main controller on the PCB located on the back of the LCD panel. The controller will convert the signals received into the required drive signals with right timing order and pass them onto driver IC, and light up the pixel dots ultimately.

Though they are the same in the above mentioned respective, they have some huge differences.

 

Their differences lie mainly in the different circuitries.

For digital LCD, the signal is running in the digital chain; It inputs digital signals directly, which means the RGB(red /green/blue) signals have been converted into digital ones by video processor, and then they were sent to driver IC (from main controller) on the edge of LCD panel. The analog/digital conversion has completed before the nod of driver IC.

 

For analog LCD, the input signals to main controller are analog, then another analog/digital conversion is required and processed in the A/D circuitry of the inner circuit on the LCD panel.

 

Now we can see the signal of digital LCD is more secure to avoid disturbance as it has less an A/D conversion compared with the counterpart of analog LCD. Digital LCD can restore better quality of the original images. For analog LCD, the digital signal is converted to an analogue one by video processor, and then it's converted again from analogue to digital by the circuit of LCD panel. The image quality will then be less comparatively (due to signal loss during the conversions).