Optical bonding is also called non-air-gap technology. Comparing with traditional fit method，Optical bonding can clearly show the difference of images from the relected images from the screen.This is the mainstream trend of high level SMT paster processing fitting of smart phones and tablet panels at present.The process and components of touch panel seem simple, but in fact, the process of touch panel is changeable. In technology, the front-end process and the back-end process are very changeable and growing.
Optical bonding technology is to glue the panel directly onto the outer glass (or touch panel). Because of the vacuum in the middle, the problem of light refraction can be avoided. but if it's the traditional frame type bonding , it will be easy to see the phenomenon of overlapping like two pieces of glass. In addition, Opetical bonding can make the screen more realistic with high brightness and high quality. Even in the outdoor strong light, the screen display content of SMT processed mobile phones or tablets can be clearly seen。
Optical bonding will be an unstoppable trend, but the challenge is that it is much more difficult to bond than touch panel glass capacitor bonding, and the larger the size is, the more difficult it is to bond. LCD panel and touch panel are both expensive products. In case of damage in the process of bonding, the loss will be enormous.
What is Optical bonding technology? The competition of smartphones is becoming more and more fierce. Many manufacturers hope to highlight themselves through hardware differentiation. What new terms such as IPS, SLCD, retina, ClearBlack are constantly appearing. Many times, when we do not understand the new technology yet, new technical terms are born. Recently, many mobile phone manufacturers have begun to use the technology of "full fit" to increase the selling point of their mobile phones? Let's take a look at what this is.
Screen structure
Air bonding
From the structure of the screen, we can roughly divide the screen into three parts. From top to bottom, they are protective glass, touch screen and display screen. These three parts need to be fitted. Generally speaking, they need to be fitted twice, once between the protective glass and the touch screen, and the other is between the display screen and the touch screen. According to the way of fit, it can be divided into two kinds: full fit and frame fit.
What is optical bonding Technology?
The so-called air bonding is also called oral glue bonding, that is, simply fixing the four sides of the touch screen and the display screen with double-sided glue. This is also the bonding method adopted by most display screens at present. Its advantages are simple technology and low cost, but there is an air layer between the display screen and the touch screen, which results in the display effect that is greatly discounted after light refraction.And it is the biggest defect of frame pasting.
Optical bonding means that the panel and the touch screen are completely bonded together in a seamless way with water or optical glue. Compared with the air bonding, it can provide better display effect.
Optical bonding technology advantage
Optical bonding technology eliminates the air between the screens, which helps reduce the reflection between the display panel and the glass, makes the screen look more transparent and enhances the display effect of the screen. At present, some mobile phones, such as the 4S, M2, Nexus 7 and Ascend D1 four cores, also adopt full-bonding technology. In addition, Apple's latest iMac also uses full-bonding technology.IMac reflections with optical bonding technology can be reduced by 75%.
Another advantage of optical bonding technology is that the screen will never gray again. Touch control module also improves the intensity because of its close combination with the panel. In addition, optical bonding can effectively reduce the interference caused by the noise of the display panel to the touch signal.
Although the advantages of optical bonding are huge, the yield of good products is relatively low. The consumption and scrap of surface glass and even panels caused by poor yield will inevitably lead to the increase of cost. Therefore, the control of defoaming and bonding yield will become more important than the cost of materials.
