Kunlun Tongtai touch screen - four technologies of touch screen introduction

1. Embedded touch screen structure

At present, the touch screen basically adopts the external structure, the display module and the touch module of this structure are two relatively independent devices, and then the two devices are integrated through the back-end lamination process, but this relatively independent external structure will affect the thickness of the product, which does not conform to the development trend of increasingly thin and light touch display products. This gives rise to the concept of an in-line touch screen, in which the touch module is embedded in the display module, so that the two modules become one, rather than two phases

for stand-alone devices. Compared with the traditional plug-in structure, the advantages of the embedded structure are: only 2 layers of T○ glass, reduced material cost, improved light transmittance, and thinner: there is no need for the back-end lamination of the touch screen module and the TFT module, which improves the yield rate; The touch screen group is produced at the same time as the TFT module, which reduces the transportation cost of the module. There are two types of embedded touch screens: ln-cell technology and On-ce technology.

LN-cell technology

The definitions of the two technologies are slightly different, but the principles are similar, both are embedded in the touch screen in the LCD module. -CEL technology integrates the touch screen under the color filter, and because the touch sensor is placed inside the LCD panel, it occupies a part of the display area, so part of the display effect is sacrificed, and the process is complicated, and high yield is difficult to achieve.

On-cel technology

O-ce technology integrates a touch screen on the color filter, instead of embedding a touch sensor inside the LCD panel, only a simple transparent electrode needs to be formed between the color filter base plate and the polarizer, which reduces the technical difficulty. The main challenge for O-C is the amount of noise that the display couples to the sensing layer, and the touch screen elements must use sophisticated algorithms to handle this noise. O-C ‖technology offers all the benefits of integrating a touchscreen into a display, such as thinner and lighter touch panels and significant cost reductions, but the overall system cost reduction is still far less than that of LCEL‖ technology. The concept of inline was first proposed by TMD in 2003, followed by Sharp, . Samsung, AUO, LG and other companies have proposed this concept and published some research results, but due to technical problems, none of them have been able to achieve commercialization.

The embedded touch screen has been developed for nearly 10 years, and there is still a certain distance from the commercialization, but the embedded touch screen represents the future development direction of the touch screen, and the manufacturers who actively reserve the embedded technology will be in a relatively advantageous position in the future market competition.

2. Multi-touch technology

In 2007, Apple implemented the multi-touch function through projected capacitive technology, which provided an unprecedented user experience, reflecting the difference from other touch technologies at the time, making multi-touch technology a trend in the market. At present, multi-touch technology has developed from only two-finger zoom, three-finger scrolling and four-finger dialing to support more than 5-point touch recognition and multiple input methods.

3. Hybrid touch technology

Although there are many types of touch technology, each has its own pros and cons, and no one is perfect. In recent years, some people have begun to put forward the concept of hybrid touch technology, that is, two or more touch recognition technologies are used on a touch surface to achieve the purpose of complementing the advantages and disadvantages of multiple touch technologies. At present, a hybrid touch screen based on capacitive and resistive has been developed, which can be operated by a stylus and fingers, and supports multi-touch, etc., which significantly improves the recognition efficiency of the touch screen. With the continuous improvement of users' requirements for touch technology, a single touch technology will definitely not meet people's needs, so hybrid touch technology will surely become one of the development directions of touch technology in the future.

4. Haptic feedback technology

The continuous development of touch display technology brings people convenient operation methods and good visual effects, but neglects to give users a haptic feedback when touching operation. At present, there is not much research on haptic feedback technology, and Immersion in United States has launched a haptic feedback technology called "Forcefeedback", which uses a mechanical motor to produce vibration or motion, which can simulate tactile effects such as jumping, object falling and damping motion, and is also the most used haptic feedback technology. Senseg's "E-sense" technology uses the principle of a bioelectric field to generate a haptic feedback. The development of more realistic haptic feedback technology can bring users a new touch experience, so haptic feedback technology is also a direction for the development of touch technology in the future.

Kunlun Tongtai touch screen - four technologies of touch screen introduction

Kunlun Tongtai touch screen - four technologies of touch screen introduction

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