What does LCD display mean

LCD LCD display is the abbreviation of liquid Crystal display, LCD structure is in two parallel glass in the liquid crystal, the middle of the two pieces of glass there are many vertical and horizontal small wire, through the power or not to control the rod crystal molecules change direction, the light refraction out of the picture. Much better than CRT, but the price is more expensive. Now LCD has replaced CRT as the mainstream, prices have dropped a lot, and has been fully popularized.

The main technical parameters of LCD

Contrast degree

LCD manufacturing control IC, filter and directional film accessories, and the contrast of the panel, for the general user, the contrast can reach 350:1 is enough, but in the professional field such a contrast level can not meet the needs of users. Compared with CRT monitors that are easily up to 500:1 or higher, only high-end LCD monitors can achieve this level. Samsung, Asus, LG and other brands in the market today's LCD display can reach the level of 1000:1 contrast, but because the contrast is difficult to accurately measure through the instrument, so pick the time or to own to see the line.

Contrast is very important, it can be said to choose a liquid crystal more important than the bright indicator, when you understand that your customers buy LCD is used for entertainment to watch the DVD, you can emphasize that contrast is more important than no bad point, we look at streaming media, the general film source brightness is small, but to see the character scene of the contrast, Hair gray to black texture changes, it is necessary to rely on the level of contrast to show that the test software in the 256 level of gray test in the head can see more small gray lattice that is good contrast!

Brightness

LCD is a substance between the solid and the liquid, itself is not luminous, need to rely on additional light source to do. Therefore, the number of tubes is related to the brightness of the liquid crystal display. The first liquid crystal display only up and down two lamps, developed to now, the lowest universal type is also four lights, high-end is the six lights. Four lamp design is divided into three kinds of display forms: one is four sides have a lamp, but the disadvantage is that the middle will appear in the shadow, the solution is from up to the next four lamp flat arrangement of the way, the last one is "U" type of placement, in fact, the two lights disguised as a result of the two lamp. Six lamp design is actually used is three lamp, the manufacturer will bend three lamps to "U" type, and then placed parallel to achieve the effect of six lamp.

Signal response Time

Response time refers to the reaction speed of the liquid crystal display to the input signal, i.e. the reaction time of the liquid crystal from Damin to light or dark, usually in milliseconds (ms). To make this clear, we also need to talk about the perception of the dynamic image from the human eye. There is a phenomenon of "visual residue" in human eyes, and the image of high-speed motion will form a brief impression in the human brain. Cartoons, movies and so on until now the latest game is the application of the principle of visual residue, so that a series of gradient images in front of the human eye rapid continuous display, it will form a dynamic image. People can accept the screen display speed is generally 24 per second, which is also the film 24 frames per second speed of the origin, if the display speed below this standard, people will obviously feel the picture of the pause and discomfort. According to this index calculation, each picture display time need less than 40ms. In this way, for the liquid crystal display, the response time of 40ms has become a hurdle, less than 40ms of the display will appear obvious phenomenon of the screen flicker, people feel dizzy. If you want the image to achieve the level of not flashing, it is best to achieve 60 frames per second speed.

Visual angle

LCD visual angle is a headache, when the backlight through the polar plate, liquid crystal and orientation layer, the output of light has a directional. In other words, most of the light is shot vertically from the screen, so from a large angle to view the LCD, you can not see the original color, or even only see the whole white or black. To solve this problem, manufacturers have also started to develop wide-angle technology, so far there are three more popular technologies, respectively: Tn+film, IPS (in-plane-switching) and MVA (multi-domain VERTICAL alignment).