All of you must have heard of LCD and OLED displays, which are used by most modern day televisions and monitors. In case of an LCD display, the mechanism is driven by thousands of small RGB (Red, Green and Blue) dots; three of these dots together form what is known as a pixel. On further splitting up a pixel, you will see a backlight, three color filters, liquid crystals and polarizers. Light travels through all these filters and goes through a complex set of filtering process before you finally get the output.
Moving on, OLED displays are an augmented television display technology and are superior to LCD. As compared to LCD, OLEDs use the same concept of RGB colors but without the backlight. In OLED displays, light is generated by an organic compound that glows when a current is applied. OLED displays are mainly more vibrant because of the absence of Backlights. Other than that, OLED screens can be made very thin in comparison to other display technologies.
Here is a video by Cnet that demonstrates how LCD and OLED displays work and how they are different from each other:
