Interpretation of key parameters of LCD screen

1,TFT-LCD

For the screens we generally use, TFT-LCD is usually written in the first item in the specification book.

TFT (Thin Film Transistor) is a thin film field effect transistor. The so-called thin film transistor means that each liquid crystal pixel on the liquid crystal display is driven by a thin film transistor integrated behind it. This enables high-speed, high-brightness, and high-contrast display of screen information.

TFT is an active matrix liquid crystal display, and TFT-LCD liquid crystal display is a "true color" (TFT).

2,brightness 

Brightness refers to how bright the picture is. LCD has a backlight, which is formed by light-emitting diodes connected in series and parallel. 

The brightness of a light-emitting diode is generally expressed in terms of luminous intensity (Luminous Intensity), and the unit is candela cd, 

1000ucd (microcandela) = 1 mcd (millicandela).

The higher the brightness, the better. Higher brightness often makes people feel uncomfortable. 

On the one hand, it easily causes visual fatigue. It also reduces the contrast between pure white and pure black, 

affecting the performance of color and gray scales. Therefore, while increasing the brightness, the contrast must also be increased, 

otherwise the entire display will appear white.

3,pixel 

The image we see is made up of many small dots, which we call pixels, also called pixels.

Under the same physical area, the more pixels, the clearer the displayed image, and the fewer pixels, the blurry the displayed image. For example, if a portrait photo has 20 million pixels, even the pores may be clearly visible. If there are only 1 million pixels, the nose and eyes may be blurry. This is how the number of pixels is used to describe the clarity of the picture. degree.

The more pixels per unit physical area, the higher the definition.

4,Pixels H x V 

The resolution is generally described as M

For example, a picture with a resolution of 1920 To put it bluntly, resolution still describes the total number of pixels in an image, 

it's just a different description method.

5,Color depth

Color depth is color depth. Color depth does not refer to how many colors it covers, but how many grayscales (which can be simply understood as different brightnesses of a color) the same color has. In the world of color depth, "every color" All colors are not just one color." Because each color has multiple grayscales, the unit is bit.

For example, if an 8-bit display screen has a single channel, then each color light channel is represented by 8 bits. That is, multiplying three 2 to the 8th power equals 2 to the 24th power, which is what we often say. The "true color depth" has a total color number of 16.7M colors. This standard is almost adopted by current mainstream monitors.