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big size touch screen display
May 18, 2018

Beijing time on August 28 news, China's touch screen network news, with the current medium and large touch screen applications, in the Apple camp, desktop computers, notebook computers, there is still no large number of imported touch application design. Currently, only iPhone, iPod Touch, iPad mini, iPad and some iPod products use touchscreen man-machine interface design. The touch-based human-machine interface used in Apple applications is still mostly small and medium-sized screen applications.


 On the other hand, in the non-Apple camp, almost the mainstream laptops and desktops have already begun to introduce touch-based man-machine interfaces, and even some desktop computers with more than 20 inches already have touch man-machine interfaces. The trend of application of touch human-machine interface has been adopted in large numbers by mobile devices of small and medium screens. It has gradually spread to the field of notebook computers and desktop computer applications. Even computer peripheral manufacturers have begun to produce large-size touches. Control screen products.


    Resistive touch development early screen application support good


    However, for the touch HMI products, the resistive touch sensing technology used in the early days can provide excellent advantages in terms of materials and technology costs, and can also respond to touch technologies from small screens to medium/large screens. Integration requirements, but in fact, resistive touch technology in the actual surface, there are still constrains in materials, structures and technologies, for example, touch sensing the film structure will cause the screen to be affected by light transmittance, but also because of the film The pressure-sensing mechanical structure makes the service life greatly affected by the large number of touches, and it is easy to expose the technical application defects on the frequently used type of device.


    In order to improve the operating experience of mobile devices, Apple has invested in the development of a touch screen man-machine interface based on capacitive touch technology, and a capacitive touch screen with G/G (Glass to Glass Structure) structure to develop iPhone products. Due to the integrated structure of the G/G touch glass and the LCD screen, there will be no application restrictions such as the resistive touch film significantly affecting the transparency of the light and the display, making the iPhone product unprecedented success in the market and allowing capacitive touch. Technology has begun to be taken seriously by related technology companies, and they are turning to more sophisticated capacitive touch technologies.


    The iPhone was originally designed with a G/G touch screen. Newer, thinner, in-cell touch panels.


    However, in the early days of capacitive touch technology, the technical principle was to sense the slight change in the electrical status of the entire sensing layer by sensing the screen contact of the operator's finger, and then to analyze the contact position through the touch IC, and initially develop a small screen. The touch design is still able to cope with product development needs. However, if you switch over to the integration of touch devices that exceed the screen size, the large-screen protection glass of the G/G structure will be difficult to bond, and the yield will affect the end product. The price will affect the cost of introducing middle-size touch screens into the capacitive touch technology. In order to keep up with the boom in touch applications, the demand for large-screen touch man-machine interfaces will be explored by early adopters. Optical sensing or acoustic sensing touch technology for product development.


     

Illustration: For 10.1 inch or less touchpads or notebooks, pay more attention to touchscreen display and contact tracking accuracy.


    It is also because the Apple iPhone/iPad redefines the experience of touch-based human-machine interface. As a result, users are increasingly demanding more man-machine interaction operations for touch-based products, such as the multi-touch touch common to mobile devices. Contact tracking, high-efficiency human-to-machine interface contact detection and system response requirements increase, leading to even the sensor-based, acoustic-sensing touch technology technology, contacts in the technical architecture via sensing, feedback, and analysis. In the process of computer interface feedback, due to the multiple conversion of the sensing signal by the technical side, the feedback time of the contact information of the system integration feedback signal is too long, which affects the user's touch experience on the large screen, and the non-Apple computer equipment. Most of them are equipped with Windows operating system. Microsoft began to implement system integration after Vista's Windows operating system. The recently released Windows 8 system has better integration of the touch human-machine interface, and it also allows medium/large screen products to have a touch. The demand for control screen design is warming up.


    Large screen with optical or sonic sensing touch integration is better


    For G/G capacitive touch panels, the development of large screens is not only an increase in difficulty in the protection of glass, but also due to structural problems in G/G, which results in large-scale designs being affected by panel strength even when G The issue of thickness of the G/G will not affect the design requirements of medium/large screen products, but in fact, G/G touch panels still have their limits to develop large screens.


    In the capacitive touch technology, Fang Zhen is facing development bottleneck in the development of large-size, originally used in whiteboards, public display touch applications, is also part of the brand computer design. For example, in all-in-one products that have more than 20 inches, optical touch-sensitive products are used, and in larger-size designs, some use acoustic-sensitive touch-sensitive products. Prosecution. Whether it is an optical or acoustic sensing touch design method, the accuracy of the tracking contact has a certain degree of error, that is, the contact accuracy can not be as accurate as a resistive or capacitive type, in addition to the human-machine interface. Touch and interface feedback procedures take longer than resistive or capacitive touches. The accuracy and system feedback speed are limited, and the benefits of large screen applications are also affected.


    In addition to accuracy and system feedback speed issues, most users are familiar with multi-touch applications on small screens. In the case of medium/large-screen touch products, optical or acoustic sensing touches are used in multi-touch applications. The application support will also be unable to obtain a better multi-touch experience due to technical bottlenecks. However, it is undeniable that optical and acoustic sensing touch technology can be applied to large-screen and large-screen applications. The use of plug-in assistants to amplify the advantages of screen-touch application flexibility and easily expand the convenience of touch applications is a technical condition that cannot be achieved by resistive and capacitive touch technology.


    Industry is actively investing in capacitive touch development


    Capacitive touch technology in the development / large-screen applications, the most priority must be resolved is the G / G structure complex problems, the first premise in the middle / large touch screen design, the touch screen module thickness optimization It is not the most necessary issue to consider. On the contrary, how to simplify the structure of the protective glass and touch-sensing glass, and at the same time achieve the surface strength of the enhanced medium/large screen, is the key point that must be considered by the relevant designer.


    In the case of common touch screen integration, the common method is to operate in front of the front screen of the LCD or AMOLED panel. The resistive and capacitive touch solutions are generally designed in this form, with transparent film or The glass material creates a touch-sensing layer that allows the screen to display and track the contact coordinates as well. For a capacitive touch screen with a 10.1 inch cut-off point and a medium-to-large screen larger than 10.1 inches, the in-cell and out-cell technologies can be used to integrate capacitive touch screens.




Illustration: The advantage of in-cell touch-side cookers is excellent thinning, but there is still room for large-scale production costs.


    In-cell technology is still difficult to use mainly small-screen applications out-cell corresponding to the middle / large size with cost advantages


    In the case of in-cells, touch screens with a size of more than 10 inches can be used. Currently, there are various types of LCD screens for VA/IPS/TN and so on. The design of in-cell cover glass for large screens is now available. Fang Hao can obtain excellent screen effects in products with a large display range, and at the same time, it can also maintain the thinness of the screen parts, which is more suitable for high-end Ultrabook or deformation notebook products that emphasize thinning design.


    In out-cell applications, for large touch screen applications, G/G and OGS (One glass solution) are better for products larger than 10 inches, although many 10.1 inch touch panels, The touch-sensitive notebooks also use GFF (Glass Film Film Structure) for mass production. However, G/G and OGS are currently more efficient than 10.1, especially G/G and OGS. , While paying attention to the image quality of large-screen design, G/G still has inherent limitations on the thickness, and it is slightly disadvantageous to pay attention to the introduction of thin and light type products. Instead, OGS has the advantages of simple structure and convenient integration. In the meantime, there are quite a lot of products introduced into mass production, and thinning advantages also make OGS touch screen technology more profitable for medium/large size applications.


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