Electronic – TFT RGB LCD construction and

brightnesslcdpixelsrgbtft

I am trying to understand the construction of an RGB TFT LCD that has brightness control in it.

I could not understand how does the TFT color LCD pixels glow? Does each of the pixel has its own light that it emits just like an LED or is it that there is a backlight bulb behind the TFT LCD screen and that bulb gives out the light that is passed through the transparent pixels while blocked by the opaque pixels?

If this is the case then how does the colors come on the TFT LCD? Are the colors due to the backlight bulb or the colors are in each of the individual pixels?

Edit:
For example this LCD:
https://www.alibaba.com/product-detail/High-brightness-1000cd-m2-5-inch_60312509314.html

Is there a single backlight bulb behind its screen?

Best Answer

An LCD doesn't emit light. It either has a reflector behind it, or a separate light source (backlight). The backlight may be controllable on any scale from a monolithic whole to a pixel.

The LCD selectively blocks light. In a color LCD, each pixel will have 3 segments which correspond to red, blue, and green filters. Color is achieved by blocking these filters to varying degrees with the corresponding element of the LCD matrix.

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