Achieving multi-touch and maintaining good sensitivity and precision on larger displays and more demanding applications is a challenge for capacitive touch design. Semiconductor manufacturers improve touch and user interface design performance by improving their immunity to electromagnetic interference and system integration.
For touch panels, big is beautiful. However, it is a challenge to achieve multi-touch and maintain good sensitivity and accuracy on a larger display and more demanding environments.
The "Global Touch Screen Market 2015" report of the business research company found that since 2009, projected capacitive touch (PCAP) technology has been widely used in a variety of touch phones and tablets. This successful model stems from an impressive product offering that includes unrestricted life from tempered glass, full-plane design capability and a high level of sensitivity. PCAP manufacturers are using this technology on large screens up to 85 inches in size, focusing on speed, accuracy, immunity to electromagnetic interference (EMI) and system integration in four directions to improve touch and user interface. Design performance.
Fast, accurate and multi-touch with a better interactive experience
On a typical consumer phone (approximately 4.5-inch diagonal screen), only one or two touch points can be recorded, while on a 47-inch diagonal commercial touch panel, ten to forty precisions are recorded. The situation of 1 mm touch points has become commonplace. When the diagonal length is doubled, the screen area of ​​the 16:9 format is four times that of the original. To maintain the same touch detection performance, the touch processor on the 47-inch screen has to handle more input signals than the 4.5-inch phone. At the same time, anti-missing, gesture recognition and other functions also increase the demand for touch processors.
Touch panel sizes continue to increase, however, in multi-player casino gaming tables, museum interactive exhibits, multi-user design workstations/construction workstations, retail store catalogs and EPOS tablets, car showrooms and bank branches, 55 Screens that are up to 85 inches in size are becoming popular. Providing a touch experience on a screen of this size means increasing the number of touch detection electrodes.
The latest in-body touch detection algorithm can double the number of touch detection electrodes, which supports 256, compared to 128 standard multi-touch controllers (for no more than The 47-inch screen) has doubled in number. The capacitive sensing matrix in the touch panel can achieve higher density, which enables it to be simultaneously touched even on the largest 85-inch touch panel based on multi-touch projected capacitive technology (MPCT). The identification of controlled events achieves greater precision.
This allows the touch controller to support forty simultaneous simultaneous touch events with a touch distance of less than 10 mm from each other and to do so in MPCT touch panels of all sizes available today.
To transfer data to a personal computer (PC) host without delay, the touch controller must have a lot of processing power. As a processor, the touch panel often becomes as important as the system itself. Due to the careful design of the firmware, additional information that must be captured on the large screen to achieve this level of performance can still be collected, processed and output to the host PC in less than 5 milliseconds.
4K screen touch delay problem has a solution
Ultra high resolution (UHD), the 4K screen, is becoming more popular and successfully integrates touch panels. However, some of the observed delays or delays are actually due to performance issues with earlier 4K screens, rather than performance issues with touch controllers.
Typical high-definition (HD) displays used today for touch panels have an update rate of approximately 120 Hertz (Hz). The data processing requirements necessary to control a very large amount of graphics data refer to the latest 4K display to operate at 60 or lower Hertz. This makes it challenging to handle instant touch events such as cursors on dragged screens, because the background image that displays processing power is consumed by the updated background image.
Therefore, the mobile touch event on the UHD display is like drawing a line, and the ability to track the finger is more obvious than tracking the HD display. Even the PCAP screen that reports touch events in milliseconds is overwritten by this delay. This problem will be reduced as 4K displays with higher update rates enter the market. But before that, you must carefully consider the touch application running on UHD and its impact on the user experience.
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