Technical parameters of LCD
1. The size of the visible area LCD is the same as the actual screen range. For example, a 15.1-inch LCD display is approximately equal to the viewing range of a 17-inch CRT screen.
2. Viewing angle The viewing angle of the LCD monitor 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 polarizing plate, liquid crystal, and alignment film, the output light has specific directional characteristics, that is, most light emitted from the screen has a vertical direction. If we look at a completely white screen from a very oblique angle, we may see black or distorted colors. Generally speaking, the up-down angle should be less than or equal to the left-right angle. If the viewing angle is 80 degrees to the left and right, it means that the screen image can be clearly seen when the position starts at 80 degrees from the screen normal. However, due to different human vision ranges, if you do not stand within the best viewing angle, the color and brightness you see will have errors. Now some manufacturers have developed various wide viewing angle technologies in an attempt to improve the viewing angle characteristics of liquid crystal displays, such as: IPS (In Plane Switching), MVA (MulTIdomain VerTIcal Alignment), TN + FILM. These technologies can increase the viewing angle of the LCD display to 160 degrees or more.
3. Dot pitch We often ask how big is the dot pitch of the LCD display, but most people don't know how to get this value. Now let's understand how it is obtained. For example, the general viewable area of ​​a 14-inch LCD is 285.7mm × 214.3mm, and its maximum resolution is 1024 × 768, then the dot pitch is equal to: visible width / horizontal pixels (or visible height / vertical pixels), That is 285.7mm / 1024 = 0.279mm (or 214.3mm / 768 = 0.279mm).
4. Color
The most important thing about LCD is color expression. We know that any color in nature is composed of three basic colors of red, green and blue. The LCD panel 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 liquid crystal displays produced by most manufacturers have each basic color (R, G, B) reaching 6 bits, that is, 64 expression levels, then each individual pixel has 64 × 64 × 64 = 262144 colors. Many manufacturers also use the so-called FRC (Frame Rate Control) technology to simulate the full-color display, that is, each basic color (R, G, B) can reach 8 bits, that is, 256 kinds of expression , Then each individual pixel has up to 256 × 256 × 256 = 16777216 colors.
5. Contrast value Contrast value is the ratio that defines the maximum brightness value (full white) divided by the minimum brightness value (full black). The contrast value of a CRT monitor is usually as high as 500: 1, so that it is easy to present a truly black screen on the CRT monitor. However, it is not easy for LCD. The backlight composed of cold cathode ray tube is difficult to switch quickly, so the backlight is always on. In order to get a completely black screen, the liquid crystal module must completely block the light from the backlight, but in terms of physical characteristics, these components cannot fully meet such requirements, and some light leakage will always occur. In general, the acceptable contrast value for the human eye is about 250: 1.
6. Brightness value The maximum brightness of a liquid crystal display is usually determined by a cold cathode ray tube (backlight). The brightness value is generally between 200 and 250 cd / m2. The brightness of the LCD monitor is slightly lower, and the screen will feel dark. Although it is technically possible to achieve higher brightness, this does not mean that the higher the brightness value, the better, because a display with too high brightness may damage the viewer's eyes.
7. Response time Response time refers to the speed at which each pixel of the liquid crystal display reacts to the input signal. Of course, the smaller the value, the better. If the response time is too long, it may make the LCD display have the feeling of trailing tail when displaying dynamic images. The response time of a general LCD is between 20 and 30ms.
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