The smartphone screen evolutionary history

With the continuous improvement of the development of the smartphone, as well as the needs of the human visual experience. Phone screen in the past 10 years as a terminal display interface has also undergone a dramatic change. A variety of new technologies is endless. To share with you today is some knowledge about the smartphone screen.
As we all know, smart phones available soon, touch screen smartphone officially boarded the stage of history. In fact, in the early development of mobile phones, the screen is not very obvious at the time are mainly monochrome LCD screen (usually called blue & white display). With the continuous development of the phone functions, especially the popularity of photo storage and viewing technology on the phone, a growing number of mobile phone manufacturers have taken note of the importance of the screen, color STN, CSTN and TFT screen on this. The phone has entered the era of the first phase of the color screen.
STN (Super Twisted Nematic), we contacted the LCD display. STN grayscale screen phone we used in the past are. STN-LCD is a passive-matrix LCD devices, its advantage is low power consumption, the maximum advantage of the power-saving. The color STN principle of display is a in traditional monochrome STN liquid crystal display plus a color filter, and the monochrome display in the matrix of each pixel is divided into three sub-pixels display red, green, and blue, respectively, through the color filter, can display a color screen. It is different from TFT screen, STN belongs Passive-type LCD, and generally can show up to 65,536 colors. This color screen applications in daily reading photo is clearly not enough. Nevertheless, it is available to the industry a clear idea, mobile phones as a terminal, it can do more.
STN screen divided into CSTN and DSTN. The CSTN ColorSTN, generally use transmissive lighting the way transfer screen to use external light source lighting, called the backlight (backlight, not only because it 's a buzzing) illumination light source mounted behind the LCD. In normal light and dark light, transmissive LCD display is very good, the outdoors, especially in daylight, it is difficult to discern display content while the backlit power generated illumination light to electric power consumption. Because the light emitting diode is laid in the lower layer of the LCD panel, this is not a secure screen. And used for a long time that heat is likely to cause the screen spontaneous combustion. At the time, this type of screen resolution shaping sexual display color gamut wider. All things are pros and cons.
TFT (Thin Film Transistor) that is a thin film field-effect transistor, belonging to one of the active matrix liquid crystal display. It can "take the initiative" of each individual pixel on the screen control, which can greatly improve the response time. Usually a TFT is relatively fast reaction time, about 80 milliseconds. And large, generally up to about 130 degrees viewing angle TFT screen is mainly used in high-end products. However, with the improvement of production technology, the screen has been very popular, it can be said, in the mobile space, it completely replace STN screen.
Although the above three screen material let the phone to enter the era of the color screen, these screens there are some defects in design, for example, the color performance of the screen, the screen in the energy-saving aspects of the design, so we put all classified as first class color screen, but the smartphone touch screen become a trend, operating systems and software applications on the phone screen has a higher demand.
IPS (In-Plane Switching, Plane Switching) technology is Hitachi LCD panel technology introduced in 2001, commonly known as "Super TFT. IPS panel is the greatest feature of its poles are in the same plane, unlike the other of the electrode of the liquid crystal mode is arranged in the upper and lower surfaces, three-dimensional. Since the electrodes on the same plane, regardless of the state in which the liquid crystal molecules is always parallel with the screen, causes the screen opening ratio is reduced. Such benefits is to reduce the transmission rate, the IPS applications will need more backlight LCD TV. The advantage of the IPS panel is a high viewing angle, fast response, accurate color reproduction, high-end products in the LCD panel. The panel technology enhances LCD dynamic display, watch sporting events, action movies and sports such as faster program can get better picture quality. And compared to other types of panel, IPS panel gently draw is not easy water patterns deformation appears, therefore known and hard screen. Applications in multimedia smart phones, IPS is undoubtedly the best choice.
AMOLED (full name: Active Matrix / Organic Light Emitting Diode) active-matrix organic light-emitting diode panels (AMOLED) is known as the next generation display technology, including Samsung Electronics, LG moviles chinos , Philips attaches great importance to this new display technology. Because the AMOLED regardless of quality, performance and cost, congenital performance superior to TFT, the LCD. Although yields have been stagnant, many international companies still do not give up the development of AMOLED. Faster reaction speed AMOLED display performance, higher contrast, viewing angle is also wider, these AMOLED born overcomes TFT LCD place; AMOLED with self-luminous features, without the use of the backlight, so more than TFT can be made thinner, and more power; there is a more important feature, without the use of the backlight board AMOLED, you can save a backlight module cost share of TFT, LCD 3 ~ 4% of the proportion.
AMOLED display is not perfect, exposed AMOLED screen on this phone Samsung I9100 "screen burn". screen burn is a unique phenomenon AMOLED display, the screen is displayed for a long time on the same screen, after switching the screen, in the corresponding position is still before the show blur. This shows the problem is not a software layer blur, but the display hardware characteristics. Uneven heating due to the self-luminous screen, thermal expansion and contraction resulting in local matrix misplaced causing this phenomenon. But I believe that this problem can be resolved soon.
The development of the smart phone will not stop, will not stop the development of the mobile phone screen.AMOLED is not the end of the phone screen development, on the contrary, it is only another beginning.