What is LCD Contrast Ratio？

Contrast is one of the main factors that affect the display effect of LCD screens. The so-called contrast refers to the ratio of the bright area to the dark area in the display screen of the LCD screen. For a monochrome display, the higher the contrast, the clearer the display, while for a color display, the higher the contrast, the more vivid and vivid the image. There are two main contrast parameters of LCD screens, one is the typical value, and the other is the maximum value. The maximum value is often an instantaneous value, which is not representative, and the typical value has reference value. At present, the contrast ratio of mainstream LCD screens is generally at the level of 400:1 to 600:1, and the best ones can reach 1000:1 or even higher. If the contrast ratio of the LCD screen is too low, it will be difficult to see the displayed content.

Different application fields have different requirements for the contrast ratio of the display screen. The contrast ratio of ordinary displays is: 300:1~400:1, and the requirements for medical equipment LCDs are higher, mainly: 600:1~1000:1. The display screens used for medical equipment do not have many requirements for color display, mainly to express gray Step image between black and white. The contrast of the LCD screen directly affects the gray level and color level performance in the image. The improvement of the contrast will make the picture layered stronger and the light and dark areas obvious, which means that the user can more easily see the picture under the dark condition of the scene. . How to improve the LCD screen? There are several ways.

Optimizing Voltage for LCD Displays

This solution is the most economical. For LCD screens, different viewing angles require different driving voltages. If the voltage is too low, the LCD screen will be dim. When the voltage is too high, the LCD screen will display non-selected segments (ghost images). Therefore, when discussing the best contrast ratio, we must first determine the voltage and improve it by optimizing the voltage. LCD contrast.

Improving LCD Panel Technology

The contrast of the LCD can be improved by improving the panel technology of the LCD. The contrast of the display using the TN panel is relatively low, and the IPS and VA technology can be used, that is, the LCD using the IPS panel and the VA panel. The LCD contrast ratio of the two panels is much higher than that of the TN.

Use better polarizers

The higher the polarization efficiency of the polarizer, the better the contrast of the LCD display, and the effect is most obvious for the negative display. If the polarization degree of the polarizer is changed from 98% to 99%, the contrast of the negative LCD display can be changed from 45 increases to over 1000, while positive contrast can be increased from 7 to 10. For ambient light, the more reflective the polarizer, the better the contrast; with backlighting, the more transmissive the polarizer, the better the contrast.

Apply a premium orientation layer

The initial alignment of liquid crystal molecules in a liquid crystal display determines the performance of the display, such as contrast, response time, and viewing angle, and the alignment layer material can induce uniform alignment of liquid crystal molecules. A new type of soluble polyimide, using high-quality rubbing fibers and high-quality rubbing equipment to make the liquid crystal molecules uniformly arranged, thereby improving the contrast of the LCD screen.

Many LCD liquid crystal displays produced by Tuopuwei have built-in PWM function, and users can adjust the LCD contrast according to specific needs, which is simple and convenient.

Shenzhen Youritech Technology Co.,Ltd. focuses on the research and development ,design ,customization and production of LCD,OLED,touch screen and other products.

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