Electronic enthusiasts : As the size of capacitive touch screens increases, the most common advanced feature requirement is the stylus. The fine pen stylus function with built-in anti-palm touch function on the big screen is in line with the user's intuitive needs, because it has a high similarity to ordinary paper and pen. It provides consumers with a natural user interface that combines the ease of use of paper and pen with the flexibility of a PC. As the screen size of touch devices increases, the main test for engineers is to achieve a satisfactory experience on a small-sized mobile phone on a larger touch screen. This means scanning more sensor nodes and larger screen surfaces in the same amount of time. For the stylus, the touch screen controller is required to dynamically switch back and forth between the stylus and the multi-finger touch input. In addition, advanced algorithms and sensing methods are needed to detect very small signals from the stylus while also eliminating unwanted large signals from the user's palm. Therefore, the processor must be able to recognize smaller signals with more noise while maintaining speed, accuracy, and quick response, which are necessary for a good user interface experience.
Jagadish Kumaran, senior marketing manager for Cypress Semiconductor's TrueTouch, said that one of the main trends in the market is that vendors are striving to differentiate through larger sizes and more advanced features.
How does the touch controller achieve unparalleled resistance to charger noise?
Currently, for touch screen devices, charging (noise) noise is the most realistic and common problem it faces. How to solve the problems of false triggering, sensitivity, precision, etc. when using the touch screen device in the charging process is an issue that engineers must consider in the design process.
In this regard, Jagadish Kumaran takes the TMA568 touch controller as an example, from the performance of the TMA568 in the use of wireless charging / third-party mobile phone charger, the patented technology - the excellent features of ChargerArmorTM, and the flexible PSoC architecture to elaborate on the game How does Plath differentiate?
Jagadish Kumaran emphasized that when using wireless charging/third-party mobile phone chargers, the TMA568 uses a range of tools to mitigate the effects of noise on the touch screen controller. We have several exclusive tips to eliminate false positive or missing points, positional jitter, false lifts, and signal attenuation.
The successful ChargerArmor noise cancellation technology – the ChargeTouchArmorTM feature of the TrueTouch Gen5 series features an unprecedented 40V peak-to-peak (Vpp) anti-charger noise capability from 1 to 500kHz, ultra-thin 0.5mm cladding and a maximum 22mm finger size. This is the most demanding touch screen controller test parameter. At present, no competitors can achieve anti-noise performance above 15Vpp under the same test conditions.
Comparison of the anti-noise ability of Figure Cypress TMA568 and other competitors
Tx-Boost technology - TrueTouch also features ultra-high Tx voltage multi-phase Tx technology, which we call Tx-BoostTM. This technology can drive the screen with 10V Tx and up to 37 multi-phase Tx (equivalent to 28V Tx), which is significantly better than the competition. The architecture of the narrowband Rx channel and single correlation scan protects the TMA568 from broadband noise sources.
Hardware DSP Filters - The TMA568 also includes an advanced hardware DSP filter that reduces the effects of charger noise by effectively filtering out noise samples.
The maximum transmission frequency is 500kHz - the TMA568 supports a maximum transmission frequency of 500kHz and has built-in adaptive frequency hopping capability. This capability allows it to be selected over a wider range of frequencies for optimal performance.
Flexible PSoC Architecture - Cypress's entire touchscreen solution leverages PSoC's flexible architecture for leading performance. The digital and analog modules within the TMA568 can be configured for specific designs for optimal performance.
Light and thin touch screen device noise interference upgrade How does the TMA568 achieve superior touch performance?
Nowadays, it is light and stylish. The appearance of touch screen devices has become thinner and thinner, especially for touch screen phones, and the noise of chargers and displays has become larger and larger. At the same time, the environment in which consumers use equipment is getting worse, so providing superior touch performance requires a more durable touch screen controller.
Jagadish Kumaran said that because the anti-noise performance of TrueTouch is already very advanced, the TMA568 is fully capable of handling the touch performance of ultra-thin touch devices. At the same time ensure a high quality user experience. The TMA568 also supports Cypress's patented single-layer independent multi-touch (SLIM) sensor, making it unnecessary to worry about performance degradation when designing ultra-thin touch devices. Jagadish Kumaran said, "We are also working with several display suppliers for on-cell and in-cell design. The excellent noise immunity of the TMA568 makes it an ideal choice for these bonded structures."
In summary, the touch screen is a complex system. Users want to use touch devices reliably under a variety of harsh environmental conditions (such as high and low temperature, humidity, condensation, sweat on the screen, etc.) and when using third-party chargers, wireless charging and car charging. Cypress's TMA568 is designed to meet these challenges while providing a rich set of advanced features for a great user experience such as passive stylus, glove touch and hover. In addition, TMA568 works perfectly with oleophobic coatings and protective films in terms of oil resistance. The TMA568 supports dynamic baseline recalibration, which automatically adjusts to changes in screen characteristics for reliable touch sensing.
——This article is selected from the electronic enthusiast website October “Touch Technology Special Issue†“Change The World Columnâ€, please indicate the source, please do it!
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