Multi-channel contact sensing apparatus
First Claim
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1. A sensing apparatus, comprising:
- a sensing loop that comprises a plurality of loops, wherein each of the plurality of loops receives an electromagnetic field from a pen and outputs a single-ended reception signal;
a converter that converts the single-ended reception signal into two differential signals that are inverted to each other;
a rectifier that comprises two input ends each receiving each of the two differential signals and two output ends, rectifies the each of the two differential signals, and outputs two rectified signals; and
a controller that determines an input point of the pen based on a voltage difference between the two rectified signals.
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Abstract
A multi-channel contact sensing apparatus includes a ground contact part, a loop unit including a transmitting sub-loop unit and a receiving sub-loop unit, a controller that controls by applying a transmission signal to the transmitting sub-loop unit, and receiving a reception signal from the receiving sub-loop unit, and a switch unit that prevents each of at least one loop of the transmitting sub-loop unit and at least one loop of the receiving sub-loop unit from being connected to the ground contact part during a first period. The multi-channel contact sensing apparatus simultaneously measures a finger touch input and a pen input.
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Citations
18 Claims
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1. A sensing apparatus, comprising:
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a sensing loop that comprises a plurality of loops, wherein each of the plurality of loops receives an electromagnetic field from a pen and outputs a single-ended reception signal; a converter that converts the single-ended reception signal into two differential signals that are inverted to each other; a rectifier that comprises two input ends each receiving each of the two differential signals and two output ends, rectifies the each of the two differential signals, and outputs two rectified signals; and a controller that determines an input point of the pen based on a voltage difference between the two rectified signals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for controlling a sensing apparatus comprising a plurality of loops, wherein each of the plurality of loops receives an electromagnetic field from a pen and outputs a single-ended reception signal, the method comprising:
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receiving the electromagnetic field from the pen and outputting the single-ended reception signal; converting the single-ended reception signal into two differential signals that are inverted to each other; rectifying each of the two differential signals and outputting two rectified signals; and determining an input point of the pen based on a voltage difference between the two rectified signals. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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Specification