TFT Display

In normal reinforcement, one layer of glass or shielding will be bonded in the front of the LCD screen, so there are three reflected surfaces between glass and LCD:air-glass,glass-air, and air-polaroid.

Without any special treatments, the reflectivity of each reflective surface will be 4.5% for external light; three surfaces will be 13.5% total.

When the useful light from the screen, the backlight is 1000 lumens, less than the reflected light of 1350 lumens, reflected light reduces the contrast ratio, so the sunlight readability is not good.

In optical bonding reinforcement, bonding the layer of glass or shielding with a polaroid of LCD screen front, the refractive index of the optical adhesive is almost the same as glass, it is 1.5, contrasting with normal reinforcement, it eliminates two reflecting surfaces. At the same time, the AR anti-reflection film, which is plated on the outer surface of the shielding or protective glass, could reduce the total external reflective light to only 0.4%.

The minimum external contrast of the HMI screen should be greater than three after optical bonding. Its external contrast is increased from 1.74 to 26, making the pictures more clearly visible. Not only to increase its readability under strong light but also to improve its readability in harsh environments.

There is rapidly increasing demand for wide viewing angle TFT display modules, at present, wide viewing angle TFT display modules include MVA(Multi-domain Vertical Alignment) and IPS(In-Plane Switching), and O-Film TFT.

Most of the TFT-LCD are used in the industrial market. However, TN-LCD disadvantage is an obvious grayscale reverse phenomenon, which means the display should be the higher the gray level, the brighter in theory, from zero grayscale (black) to 256 grayscale (white) when the liquid crystal display is at a certain angle, it is possible to see the low gray level is brighter than the high gray level. This phenomenon is called grayscale reverse.

O Film TFT module can increase the viewing angle and improve the grayscale reverse. The image is a comparison of normal TFT and O Film TFT. Left is a normal TFT module, when viewed over 6 o'clock, the optimal viewing angle, normal TFT will show the problem of grayscale reverse. However, when O Film TFT also exceeds the optimal viewing angle, the problem has been improved. Therefore, O Film TFT is one of the best choices for wide viewing angles in the industrial field.