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The crop marks on the surface indicate the active area, which measures 14.7×9.2 cm or 5.8×3.6 in. An active pen (also referred to as active stylus) is an input device that includes electronic components and allows users to write directly onto the display of a computing device such as a smartphone, tablet computer or ultrabook. [1]
Active (also called digital [2]) styluses include digital components or circuitry inside the pen that communicates with a digitizer on the touch device. This communication allows for advanced features such as pressure sensitivity, tilt, programmable buttons, palm detection, eraser tips, memorizing settings, and writing data transmission.
Many new phones have a built-in stylus which tucks in behind the back cover. Some styluses may extend and contract into small, pen-like cylinders, which are easy to put away. Styluses come in both passive and active versions. A passive or capacitive stylus is a stylus that acts just like a finger when touching a device screen.
A smart pen has the same basic characteristics as a digital pen, but also has other features like voice recording or a text scanner. A smart pen is generally larger and has more features than an active pen. Digital pens typically contain internal electronics and have features such as touch sensitivity, input buttons, memory for storing ...
Capacitive sensors are constructed from many different media, such as copper, indium tin oxide (ITO) and printed ink. Copper capacitive sensors can be implemented on standard FR4 PCBs as well as on flexible material. ITO allows the capacitive sensor to be up to 90% transparent (for one layer solutions, such as touch phone screens).
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