Liquid crystal module (LCM) simply refers to the LCD screen and backlight assembly. For example, the LCD TV’s display component is the LCD module, whose low temperature is equivalent to that of the picture tube in a CRT. Other parts include the power circuit, the signal processing circuit, and of course the case.

LCD module is mainly divided into screen and backlight module. The two parts are assembled together, but work independently of each other. The principle of liquid crystal display is that the backlight components emit light, and the light is displayed through the LCD screen. The function of the LCD screen is to manipulate this light by pixel to display the image.

What is the difference between LCD module LCM and LCD panel?

LCD panel specification grade division

The so-called bad point is the LCD panel, can not normally display pixel collectively. The LCD panel is composed of many pixels, and the liquid crystal substance on each display point changes the light transmission state under the control of electrical signals. At 1024*768 resolution, the LCD has a total of 786,432 display points, so many points are difficult to fully guarantee individual problems. At present, the technology can not completely overcome the absence of bad points, so the level of the panel is judged according to the number of bad points. Manufacturers will generally avoid bad point segmentation LCD panel, no bad point or very little bad point LCD panel sold at a high price, and the number of bad points is more low price treatment.

At present, the main classification standards of panels are:

Korean manufacturers, below 3 for A grade

Japanese manufacturers, below 5 for A class

Taiwan manufacturers, below 8 for A class

Mainstream LCD brand key indicators:

AA: The LCD monitor without any bad spots is AA.

Level A: Less than 3 bad spots, of which no more than one bright spot, and the bright spot is not in the center area of the screen.

Level B: less than 3 bad spots, among which no more than 2 bright spots, and bright spots are not in the center area of the screen.

In addition, the quality of LCD panel and LCD panel resolution, brightness, response time, visibility, contrast and so on. LCD panel manufacturing selection of control IC, filter and directional film accessories and panel contrast is closely related, for the general user, the contrast can reach 35:1 is enough, but in the professional field such a contrast flat can not meet the needs of users.

Brightness is also a relatively important indicator, the brighter the liquid crystal gives a person a long look, it stands out from a row of liquid crystal wall, LCD display brightness principle is to rely on the brightness of the backlight tube behind the panel to achieve. Response time refers to the reaction speed of the LCD to the input signal, that is, the reaction time of the LCD from dark to bright or from light to dark, usually in milliseconds (ms). The shorter the response time, the better.