LCD liquid crystal display knowledge part four

The LCD display contains some things that have not been used in CRT technology. The light source for the screen is the fluorescent tube coiled behind it. Sometimes, you will find unusually bright lines on a certain part of the screen. There may also be some indecent stripes, a special light or dark image will affect the adjacent display area. In addition, some fairly precise patterns (such as dither processed images) may appear unsightly moire or interference patterns on the LCD screen.

Now, almost all LCDs used in notebook or desktop systems use thin film transistors (TFT) to activate cells in the liquid crystal layer. TFT LCD technology can display clearer and brighter images. The early LCDs were non-active light-emitting devices with low speed, poor efficiency, and low contrast. Although they could display clear text, they often produced shadows when displaying images quickly, which affected the display effect of videos. Therefore, they are now only used when needed. Black and white display in handheld computers, pagers or mobile phones.

As technology changes with each passing day, LCD technology is constantly evolving. In recent years, major LCD display manufacturers have increased their research and development costs for LCDs, striving to break through the technical bottlenecks of LCDs, further accelerating the industrialization process of LCD displays and reducing production costs. Nowadays, LCD monitors have been basically popularized, and the prices are acceptable to ordinary consumers. Even the high-tech mid-to-high-end LCD monitors produced by manufacturers such as Samsung, Asus, and LG are not "unattainable." With the rapid development of LCD technology, many drawbacks have made considerable progress. LCD displays have gradually begun to replace CRTs as the most important display device in people's daily lives.

The LED display is also a kind of liquid crystal display. LED liquid crystal technology is an advanced liquid crystal solution, which replaces the traditional liquid crystal backlight module with LED. High brightness, and can achieve stable brightness and color performance within the life span. Wider color gamut (more than NTSC and EBU color gamut) to achieve more brilliant colors. It is easy to achieve LED power control, unlike the minimum brightness of CCFL there is a threshold. Therefore, it is easy for users to adjust the brightness of the display device to the most eye-catching state, whether in a bright outdoor or a completely dark indoor. In the LCD with CCLF cold cathode fluorescent lamp as the backlight, one of the main elements that cannot be missing is mercury, which is also known as mercury, and this element is undoubtedly harmful to the human body. Therefore, many dot matrix LCD display module manufacturers have invested a lot of energy in the production of mercury-free panels. For example, the mercury-free LED backlight technology adopted by Taiwan’s famous IT manufacturer ASUS has passed the ROHS certification, making MS series products more energy-efficient than traditional CCFL displays. More than 40%, the mercury-free process not only makes it non-toxic and healthy, but also more environmentally friendly and energy-saving than other products.

Because of the use of solid-state light-emitting devices, the LED backlight has no squeamish components and is very adaptable to the environment, so LEDs have a wide operating temperature range, low voltage, and impact resistance. Moreover, the LED light source does not produce any rays, low electromagnetic radiation, and no mercury can be described as a green and environmentally friendly light source.