Because of different LCD quality and R&D technology, color screens are different. Generally speaking, the more colors that can be displayed, the more complex the image that can be displayed, and the richer the level of the picture.
The technical indicators of the screen also include the screen resolution. We divide the number of LCD units (dots) by the screen area to get the screen resolution, which is the biggest factor that determines the picture quality.
IPS panel is more stable.
IPS (in-plane switching) technology is a LCD panel technology introduced by Hitachi at 200 1, commonly known as "super TFT". The IPS camp headed by Hitachi has gathered a number of manufacturers such as LG- Philips, Hanyu Caijing, IDTech (a joint venture between Chi Mei Electronics and IBM in Japan), but there are not many models that can be seen in the market. The biggest feature of IPS panel is that its two poles are on the same plane, unlike other liquid crystal mode electrodes which are arranged vertically. Because the electrodes are on the same plane, liquid crystal molecules are parallel to the screen in any state, which will reduce the aperture ratio and light transmittance, so IPS applications in LCD TVs will need more backlights. In addition, there is also an S-IPS panel, which belongs to the improved IPS.
The advantages of IPS panel are high viewing angle, fast response, accurate color reproduction and low price. However, the disadvantage is that the light leakage problem is serious, and the purity of black is not enough, which is slightly worse than PVA. It is necessary to rely on the compensation of optical film to achieve better black. At present, IPS panels are mainly produced by LG- Philips. Compared with other types of panels, the screen of IPS panel is more "hard", and it is not easy to be deformed by water lines when swiping by hand, so it is also called hard screen. When you look at the screen carefully, if you see a fish-scale pixel to the left, plus a hard screen, then you can be sure that it is an IPS panel.
TFT screen TFT thin film transistor is a kind of active matrix liquid crystal display (am-LCD). TFT is equipped with a special lamp on the back of LCD, which can "actively" control a single pixel on the screen. This is the origin of the so-called active matrix TFT(activematrixTFT), which can greatly improve the reaction time. Generally, the reaction time of TFT is relatively fast, about 80ms, while that of STN is 200 ms If and because TFT is an active matrix LCD, the arrangement of liquid crystals can be memorized, and it will not recover immediately after the current disappears. TFT also improves the phenomenon of STN flicker (water ripple)-blur, and effectively improves the playback ability of dynamic pictures. Compared with STN, TFT has excellent color saturation, reduction ability and higher contrast, but its disadvantages are higher power consumption and higher cost.
TFD screen TFD is the abbreviation of thin film diode. Because of the high power consumption and high cost of TFT, it undoubtedly increases the usability and cost of mobile phones. TFD technology was developed by Seiko Epson, a mobile phone screen giant, and was specially used for mobile phone screens. It is a compromise between TFT and STN. The brightness and color saturation are better than STN, but it also saves more power than TFT. TFD is characterized by "high image quality, ultra-low power consumption, miniaturization, dynamic image display ability and fast response time". The display principle of TFD is to equip each pixel on the LCD with a separate diode as the control source. Because of this separate control design, each pixel will not affect each other, so dynamic pictures and bright colors can be displayed on the TFD screen without afterimage. Like TFT, TFD is also driven by active matrix.
Initially developed TFD can only display 4096 colors, but if image processing technology is adopted, it can display images equivalent to 260,000 colors. But compared with TFT, it is still inferior in color display.
Organic light-emitting diode screen Organic light-emitting diode organic light-emitting display is a new category, which is called "dream display". Organic light emitting diode display technology is different from the traditional liquid crystal display mode. It does not need backlight, and uses very thin organic material coating and glass substrate. These organic materials will emit light when current passes through them. In addition, the organic light-emitting diode display screen can be made lighter and thinner, with a larger viewing angle, and can significantly save electricity.
At present, among the two major technical systems of organic light-emitting diodes, the low-molecular-weight organic light-emitting diode technology is mastered by Japan, and the so-called OEL of polymer PLEDLG mobile phone is this system, and the technology and patents are mastered by British technology company CDT. Compared with PLED products, colorization is still difficult. While low molecular organic light emitting diodes are easily colored.
However, although organic light-emitting diodes with better technology will replace LCD such as TFT in the future, organic light-emitting display technology still has shortcomings such as short service life and difficult screen enlargement.
Other types In addition to the above kinds of LCDs, we can also see other LCDs on some mobile phones, such as GF screen of Sharp in Japan and CG continuous crystal silicon LCD. Compared with the two, they belong to completely different species. GF as an improvement of STN can improve the brightness of LCD, while CG is a high-precision and high-quality LCD.