Advantages and disadvantages of the electromagnetic touch technology oled module

Electromagnetic: the use of coil generates a magnetic field change through the current changes arising from the receiving antenna.lcd module
This is the technology used by the early tablet or drawing board, Tablet PC was also mostly used this technique, the next teaching touch screen, the digital podium on the screen, are also using the technology, the only drawback is that certain want to use a charged pen (Wacom exclusive sensing technology can be induced from the antenna end raw power, no battery), the early electromagnetic interference capability is not strong, will not be able to use a lot of tablet on the metal table on the table, now not have this problem.
The manner in which they are judged very simple, must have its own pen, and the middle of the pen there will be a coil to generate a magnetic field a lot of interactive whiteboard (non-image scanning) are also using this technology.
Points of light emitting point: Through the Camera (CMOS / CCD) observations.
The early part of this technology is integrated in the rear projection TV is used as an interactive whiteboard, later integrated projector for making presentations with many interactive whiteboard using the technology, the drawback is less accurate, there will be jitter the phenomenon (relationship because of the distance), and must be issued spot of the pen, its advantage is to reach a long-distance manipulation, very convenient for large presentations, currently the most famous Wii console is to use this technique (Note: that put expensive long sold under the TV receiver in fact, which is just two infrared LED, the real Camera on the handlebars, so it would only handle value is much larger than the bird "receiver", although a sold more than 700, a sell more than a thousand, sell that really pay any "receiver" ah ~ Oh, clever Nintendo).
Determination is very simple, there must be a small box inside hidden Camera in the distance, just as the image recognition, but he is determined to spot it (a bit like Jeff Han hand contact with the acrylic light guide light points).
At present, this technology can be divided into the visible or non-visible light, single light point / multi-spot, red / green light flash signal / Guang Shan signal, various combinations can develop different application surface (Wii used to do a similar light gun position discrimination whiteboard is the same as the remote control light flash to pass button signal, as well as to reflect whether or not to press the red or green light, and so on).Lcd display modules