What are the commonly used materials for mobile phone screen production?

If the mobile phone screen wants to display the text and image we see, it needs the three primary colors of R (red), G (green) and B (blue). Each pixel in the screen is arranged with three complete RGB sub pixels, and each color on the screen can be recorded and expressed by a set of RGB values, and the RGB component of each pixel is within the range of 0-255 intensity value. Only by mixing the three colors of red, green and blue in different proportions, we can show all the colors we see.

Mainstream smartphone screens can be divided into two categories: LCD (liquid crystal display) and OLED (organic light emitting diode).

LCD display needs the support of backlight, and the light needs to pass through two layers of glass and substrate, various optical diaphragms, alignment films and color filters to produce polarized light, which will inevitably lose brightness and color. What we call TFT is the abbreviation of thin-film transistor. In LCD, TFT deposits a layer of film on the glass substrate as the channel area to improve the image quality through thin-film transistor technology.

TFT

In short, TFT is to configure a semiconductor switching device for each pixel, which can directly control each pixel through point pulse. Moreover, because each node is relatively independent, it can also be controlled continuously. TFT can control each independent pixel on the screen, so as to display screen information with high speed, high brightness and high contrast. Generally, TFT has a reaction time of about 80 milliseconds and a visual angle of about 130 degrees. It is widely used in the mobile phone industry.

The advantage of TFT is that it can achieve visual satisfaction in terms of color saturation and reduction, and the reaction speed when rowing is also commendable. But its disadvantage is also more fatal, which is the white phenomenon, and the power consumption is also more power consuming compared with other screens.

IPS

The full name of IPS is in plane switching. The advantage of iPS technology is that it changes the arrangement of liquid crystal molecular particles, adopts horizontal conversion technology, speeds up the deflection speed of liquid crystal molecules, ensures the picture clarity and strong expressiveness when shaking, and eliminates the blurring and water ripple diffusion of traditional liquid crystal display when receiving external pressure and shaking.

In addition, due to the rotation of liquid crystal molecules in the plane, the "IPS screen" has a very good visual angle performance. In the four axial aspects of up, down, left and right, it can achieve a visual angle close to 180 degrees, which is better than the traditional TFT visual angle and better color display. However, you can't have both fish and bear's paw. The response speed is average, and in the face of the era of increasingly lightweight mobile phone appearance, it is a little difficult to control the module thickness.

OLED

OLED is the abbreviation of organic light emitting diode. Different from the TFT-LCD mentioned above, OLED does not need backlight support and has self luminescence. At the same time, it has the advantages of wide viewing angle, high contrast, low power consumption, high reaction rate, full-color and simple process. According to the driving mode, OLEDs can be divided into passive OLED (PMOLED) and active OLED (AMOLED).

The OLED screens we are now exposed to are basically AMOLED screens, and AMOLED itself is also a kind of OLED, just as we say that IPS is also TFT-LCD. AMOLED is not limited to products such as smart phones. AMOLED screens will also be used in TV products of Samsung and LG. Therefore, there is no saying that OLED is applied to TV and AMOLED is applied to small and medium-sized screens.

AMOLED adopts the mode of pentile pixel arrangement, which leads to a stronger sense of granularity compared with the same resolution. And because of the loss of backlight support. Therefore, the brightness of the screen can only be supported by self luminous pixels. Therefore, the performance of AMOLED screen is general in outdoor environment.

At present, AMOLED screens have roughly developed to three generations: AMOLED, super AMOLED and super AMOLED plus. Compared with traditional AMOLED, super AMOLED cancels the architectural design of touch sensing layer and display layer, and is directly the original touch panel, which can bring more sensitive operation, and the response speed is one thousandth of that of other materials. In addition, there is no glass covering layer, which also brings better display effect in the sun and brighter color expression. It can be said that it makes up for all the shortcomings of the previous two screen materials. First, the optional AMOLED on the mobile phone is still super AMOLED in essence, but it has been further adjusted.

Super AMOLED plus has further improved the pixel arrangement of the previous super AMOLED screen pentale, and the RGB arrangement is more delicate, which solves the problems of large display particles criticized by the majority of users. After that, HD super AMOLED, HD super AMOLED plus, full HD super AMOLED and quarter HD super AMOLED, in addition to improving the resolution, the display effect is also developing in a finer direction.