How to solve the input problem of the touch all-in-one computer
With the growing demand for new technologies, in the development process of touch products, the size of capacitive touch screens has become larger and larger, and the use of writing devices similar to paper and pen has become more intuitive and convenient. The most common way for manufacturers to support stylus functionality is with an active or passive stylus. Active styluses employ electronic components that require a power source and transmit a signal to the host device. Using an active stylus can support advanced features such as hovering on the display, pressure sensing, key support, and erasing. Passive styluses use conductive materials, which are equivalent to an extension of the user's body. The capacitive coupling of the user's hand supports the passive stylus to send a signal when it touches the screen. There is no active communication between the stylus and the host platform, so how to distinguish between a finger and a passive stylus is a difficult problem.
In many cases, there is no need to add extra cost to the system if both active and passive styluses can achieve the same characteristics. The additional components and power requirements of active styluses make it difficult to sell, while passive styluses with poor performance and/or large and bulky heads create an unnatural handwriting experience. Therefore, if the tip of a passive stylus is 1 to 2 mm, the user's palm can rest on the screen when handwriting, while maintaining sufficient speed and accuracy, and ensuring that the point of contact is exactly "where the ink" "inks", Then the user experience of the passive stylus can be improved.
To create a practical implementation that supports both finger and passive stylus operation, a number of different use cases must be considered. For example, developers should consider how fast the system needs to switch between detecting finger and stylus input. Likewise, they define how the system reacts when the stylus touches the screen before, after, or at the same time as the finger/palm. Other important factors include configuring how close the stylus is to the hand so that the stylus signal is no longer detected.
The most simple and direct method is to use the current originally carried by the human being, and perform human-computer interaction with the touch all-in-one machine through the finger, so as to realize practical and convenient screen operation.