Touch screen as the interaction of the smart board interactive whiteboard equipment is commonly used in embedded products, have interactive intuitive, simple programming and other features, this series of articles in a variety of angles will analyze how to choose the right touch screen and common troubleshooting methods.
The actual selection needs to be smart interactive whiteboard addressed in the following two points:
Change the size after commissioning work
Due to feeding situation changes, replacement cost of the screen
For resistive screen, due to the use of processor is inside the ADC module (or an external ADC chip), change the type and size of replacement, as long as there isn't a large difference with the original plan, guarantee the working voltage current can be used. But for complex such as multitouch, gesture recognition, etc., resistive screen obviously can't meet.
For capacitance screen, because smart board whiteboard the I2C, must be through the USB communication interface, such as internal communication protocol designed by the original factory screen, then the whole drive affected point is very broad, mainly manifested in the following aspects:
The kernel version, communication protocol interface, driver USES the kernel of environment, the version of the driver. Kernel version changes, it will cause the kernel API changes, and thus drive shall not apply;
IC hardware upgrade could lead to a part of the interactive digital whiteboard register values change.
Drive once modified, can the problem left to the production process, need to maintain multiple product firmware.
So selec capacitance screen, more need to consider the overall supply chain and production control ability.
Overall, resistive screen is suitable for electronic board for classroom the complex industrial production environment or medical environment, field application to wear gloves or use other tools to press the point contact. And capacitance screen is more applicable to high-end, using partial consumer environment, multi-touch, achieve the function more complex applications.
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