What is parameters of LCD module

Posted by sere on February 10th, 2020

As we all know, LCD module has green environmental protection, energy consumption is small, will not produce noise, calorific low advantages, it is also the most important computer accessories, master the parameters of the LCD module can effectively help us correctly understand the performance of the LCD, so as to provide a basis for future use and maintenance.

The most important parameters of the LCD module include:

1.1 Resolution of LCD module

Resolution is a very important performance indicator. It refers to the number of points that can be displayed horizontally and vertically on the screen (the lines and surfaces displayed on the screen are made up of points). The higher the resolution, the more information can be contained in the same screen. For a CRT capable of supporting 1280x1024 resolution, either the 320x240 or 1280x1024 resolution can be perfectly represented (because the electron beam can be flexibly adjusted). However, its maximum resolution may not be the most appropriate resolution, because if the 17-inch display goes to 1280x1024, the WINDOWS font will be small and the eyes will tire over time, so the best resolution for a 17-inch display should be 1024x768.

1.2 Contrast of LCD module

The control IC that liquid crystal panel chooses when manufacturing, filter and directional film wait for fittings, concern with the contrast of panel, to average user character, contrast ratio can achieve 350:1 enough, but in professional domain such contrast level still cannot satisfy the demand of user. CRT displays can easily achieve 500:1 or higher contrast. Only high-end LCD display can achieve such a degree, because the contrast is difficult to accurately measure through the instrument, so choose or to see it in person.

1.3 Brightness of LCD module

A liquid crystal is a substance between a solid and a liquid that does not emit light on its own, requiring the use of additional light sources. Thus, the number of tubes is related to the brightness of the LCD. The earliest liquid crystal display has only the upper and lower two lamp tubes, developed to the present, the lowest universal is also four lights, the high-end is six lights. 4 lamp tube design is divided into 3 kinds of put a form: a kind is 4 sides have a lamp tube each, but the drawback is the meeting appears in the middle black shadow, the method that solves is the way that from top to bottom 4 lamp tubes arrange flat, the last kind is "U" put a form, it is two lamp tubes that two lamps produce in disguise actually. The six-tube design actually USES three tubes, which are bent into a "U" shape and placed in parallel to achieve the effect of six tubes.

1.4 Visual Angle of LCD module

The viewing Angle of a liquid crystal is a headache. When the backlight passes through the polaroid, the liquid crystal and the orientation layer, the output light becomes directional. That means most of the light is emitted vertically from the screen, so if you look at the LCD from a larger Angle, you won't be able to see the original color, or even all white or black. IN order to solve this problem, manufacturers have also started to develop wide-angle technology. So far, there are three popular technologies: TN+FILM, IPS (in-plane-switching) and MVA (multi-domain VERTICAL alignMENT).

1.5 Signal response time of LCD module

Response time refers to the response time of the LCD to the input signal, that is, the reaction time of the LCD from dark to bright or from bright to dark, usually in milliseconds (ms). To make this clear, we need to start with the human eye's perception of moving images. The human eye has the phenomenon of "visual residue", in which high-speed images form a temporary impression in the human brain. Animation, 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 rapid continuous display, the formation of a dynamic image. Generally, the display speed that people can accept is 24 frames per second, which is also the reason for the 24 frames per second broadcast speed of the movie. If the display speed is lower than this standard, people will obviously feel the pause and discomfort of the picture. According to this index, the display time of each picture needs to be less than 40ms. In this way, the response time of 40ms becomes a barrier for the LCD, and the display with the response time lower than 40ms will show obvious "tail dragging" or "residual shadow" phenomenon, giving people a sense of chaos. If you want your images to be fluid, you need to be at 60 frames per second.