Technical parameters of LCD display
Brightness
The maximum brightness of the liquid crystal display is usually determined by the backlight source, and technically it can achieve high brightness, but this does not mean that the higher the brightness value, the better, because a display with too high brightness may hurt the eyes of the viewer. LCD is a substance between solid state and liquid state. It cannot emit light by itself, and it needs an additional light source. Therefore, the number of lamps is related to the brightness of the liquid crystal display.
Resolution
Resolution refers to the number of display pixels per unit area. The physical resolution of the liquid crystal display is fixed, for the CRT display, as long as the deflection voltage of the electron beam is adjusted, different resolutions can be changed. However, it is much more complicated to implement in a liquid crystal display. It is necessary to simulate the display effect through calculation, and the actual resolution has not changed. Since not all pixels are zoomed in at the same time, there is a scaling error. When the LCD display is used at a non-standard resolution, the text display effect will be poor, and the edges of the text will be blurred.
Chromaticity
LCD is of course important is the color performance. We know that any color in nature is composed of three basic colors: red, green and blue. For example, an LCD panel with a resolution of 1024 × 768 is composed of 1024 × 768 pixels, and the color of each independent pixel is controlled by three basic colors of red, green, and blue (R, G, B). Most of the liquid crystal displays produced by manufacturers have 6 bits for each basic color (R, G, B), that is, 64 expressive degrees, so each independent pixel has 64×64×64=262144 colors. There are also many manufacturers using the so-called FRC (Frame Rate Control) technology to simulate full-color images, that is, each basic color (R, G, B) can reach 8 bits, that is, 256 kinds of expressiveness. , then each independent pixel has up to 256×256×256=16777216 colors.
Contrast
Contrast is defined as the ratio of the maximum brightness value (full white) divided by the minimum brightness value (full black). Accessories such as control ICs, filters, and orientation films used in LCD manufacturing are related to the contrast ratio of the panel.
Response time
The response time refers to the response speed of the liquid crystal display to the input signal, that is, the response time of the liquid crystal from dark to bright or from bright to dark, usually in milliseconds. Of course, the smaller the value, the better. If the response time is too long, it may cause the LCD monitor to have a trailing trailing feeling when displaying dynamic images.
Viewing angle
The viewing angle of the liquid crystal display is symmetrical from left to right, but not necessarily from top to bottom. For example, when the incident light of the backlight passes through the polarizer, liquid crystal and alignment film, the output light has specific directional characteristics, that is to say, most of the light emitted from the screen has a vertical direction. If viewing an all-white image from a very oblique angle, we may see blacks or color distortions. Generally speaking, the up and down angle should be less than or equal to the left and right angles. If the viewing angle is 80 degrees left and right, it means that the screen image can be clearly seen when starting from a position of 80 degrees from the screen normal. However, due to the different range of human vision, if you do not stand within the best viewing angle, there will be errors in the color and brightness you see.
Visible area
The size indicated on the LCD is the same as the actual screen range that can be used. For example, a 15.1-inch LCD monitor is approximately equal to the viewing area of a 17-inch CRT screen.
