Why can only white light be seen on the LCD after removing the polarizer?

The polarizer acts as an optical switch, and the liquid crystal display must rely on polarized light to be able to image. The LCD backlight is responsible for providing the most basic light source for the display of the LCD screen, but the direction of the light sent out is inconsistent and radial. If such light passes through the twisting of the liquid crystal molecules, what we see on the screen may be a blank piece of light. , Or colorful patches of color. The lower polarizer is responsible for the work of regulating the direction of light to be consistent before sending it to the liquid crystal layer. The liquid crystal molecules are twisted after being energized, and the original direction of the light is inconsistent after passing through the twisting of the liquid crystal layer. Therefore, if the diffused light is not re-regulated, the screen will still be white in front of the screen. , The light that has been twisted by the liquid crystal is not reflected, so the diffused light must be regularized here, and a polarizer that is orthogonal to the polarization direction of the lower polarizer is used to re-deflect the light center that has been twisted by the liquid crystal, and the light at different angles The brightness of the upper polarizer is different, so we can see the alternating light and dark pictures on the screen, because the deflected light is the colored light after the color filter, so we can see the image we need in front of the screen