Mobile Phone LCD Screen Quality Control Expert

LCD Monitor Overview

by:Kimeery     2023-03-27
Overview Display (LCD) is called in English. It is a display that uses liquid crystal to control light transmittance technology to achieve color. Compared with CRT monitors, the advantages of LCD are obvious. Because the brightness and darkness are controlled by controlling whether the light is transmitted, when the color remains unchanged, the liquid crystal remains unchanged, so there is no need to consider the refresh rate. For a LCD screenwith a stable picture and no flicker, the refresh rate is not high but the image is also very stable. The LCD screen also uses the technical principle of liquid crystal to control the light transmittance to make the bottom plate emit light as a whole, so it achieves a truly completely flat surface. Some high-end digital LCD monitors use digital elements to transmit data and display images, so that there will be no color deviation or loss caused by the graphics card. There is no advantage of radiation at all, even if you watch the LCD monitor screen for a long time, it will not cause great damage to your eyes. Small size and low energy consumption are also unmatched by CRT monitors. Generally, the power consumption of a 15-inch LCD monitor is equivalent to one-third of that of a 17-inch flat-screen CRT monitor. At present, compared with CRT monitors, the image quality of LCD monitors is still not perfect. The color performance and saturation of LCD monitors are lost to CRT monitors to varying degrees, and the response time of LCD monitors is also longer than that of CRT monitors. When the picture is still, it is okay. Once it is used for playing games and watching DVDs, the picture update speed When the display is blocky and sharp, the weakness of the liquid crystal display is exposed, and the picture delay will cause ghosting, tailing and other phenomena, which will seriously affect the display quality. The working principle of the LCD display: From the perspective of the structure of the LCD display, whether it is a notebook computer or a desktop system, the LCD display used is a layered structure composed of different parts. The LCD consists of two glass plates, approximately 1 mm thick, separated by uniform intervals of 5 μm containing liquid crystal material. Because the liquid crystal material itself does not emit light, there are lamp tubes as light sources on both sides of the display screen, and there is a backlight plate (or uniform light plate) and reflective film on the back of the mobile LCD screen display screen. The backlight plate is composed of fluorescent substances. It can emit light, and its main function is to provide a uniform background light source. Light from the backlight enters the liquid crystal layer containing thousands of liquid crystal droplets after passing through the first polarizing filter layer. The droplets in the liquid crystal layer are all contained in tiny cell structures, and one or more cells make up a pixel on the screen. There is a transparent electrode between the glass plate and the liquid crystal material. The electrodes are divided into rows and columns. At the intersection of the rows and columns, the optical rotation state of the liquid crystal is changed by changing the voltage. The role of the mobile LCD screen material is similar to a small light valve. Around the liquid crystal material are the control circuit part and the driving circuit part. When the electrodes in the mobile phone LCD generate an electric field, the mobile LCD screen molecules will be twisted, so that the light passing through it will be refracted regularly, and then filtered by the second filter layer and displayed on the screen. technology also has weaknesses and technical bottlenecks. Compared with CRT displays, there are obvious gaps in brightness, picture uniformity, viewing angle and response time. Among them, the response time and viewing angle depend on the quality of the liquid crystal panel, and the uniformity of the picture has a great relationship with the auxiliary optical module. For liquid crystal displays, the brightness is often related to his back panel light source. The brighter the backplane light source, the brightness of the entire LCD will also increase accordingly. However, in the early liquid crystal displays, because only two cold light source lamps were used, uneven brightness and other phenomena were often caused, and the brightness was not satisfactory at the same time. It was not until the launch of products using 4 cold light source lamps that there was a great improvement. The signal response time is the response delay of the liquid crystal unit of the liquid crystal display. In fact, it refers to the time required for the liquid crystal unit to change from one molecular arrangement state to another molecular arrangement state. The smaller the response time, the better. It reflects the speed at which each pixel of the LCD screenreacts to the input signal, that is, the screen The speed from dark to light or from light to dark. The shorter the response time, the less the user will feel the tail dragging when watching a moving picture. Some manufacturers will reduce the concentration of conductive ions in the liquid crystal to achieve a fast response to the signal, but the color saturation, brightness, and contrast will be reduced accordingly, and even color cast will occur. In this way, the signal response time is increased, but the display effect of the liquid crystal display is sacrificed. Some manufacturers use a method of adding an IC image output control chip to the display circuit to process the display signal. The IC chip can adjust the signal response time according to the VGA output video card signal frequency. Since the physical properties of the liquid crystal are not changed, its brightness, contrast, and color saturation are not affected, and the manufacturing cost of this method is relatively high. It can be seen from the above that the quality of the LCD panel does not fully represent the quality of the LCD. Without an excellent display circuit, no matter how good the panel is, it cannot make a liquid crystal display with excellent performance. With the increase in the output of LCD products and the decline in cost, liquid crystal displays will become popular in large numbers.

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