Touch panel input apparatus performing a sampling operation intermittently
First Claim
1. A touch panel input apparatus comprising:
- a touch panel including two electrode panels one of which has a resistance distribution uniform in an X-direction and the other of which has a resistance distribution uniform in a Y-direction;
a touch panel control circuit for, in a power-off state of the apparatus, applying a first voltage to one end of one of the two electrode panels, and at the same time, applying a second voltage to one end of the other electrode panel via an output resistance, and sampling a voltage which is developed between both terminals of the output resistance when the two electrode panels have been brought into contact with each other; and
wherein the touch panel control circuit includes;
electrode panel control means for, in the power-off state of the apparatus, intermittently applying the first voltage to the one end of the one electrode panel synchronously with a clock signal, and at the same time, intermittently applying the second voltage to the one end of the other electrode panel via the output resistance; and
sampling means for, in the power-off state of the apparatus, performing the sampling of the voltage synchronously with the clock signal and outputting a signal indicating whether or not the sampled voltage is equal to or higher than a predetermined level, wherein when the signal indicates that the sampled voltage is equal to or higher than the predetermined level, the signal is a power-on instruction signal.
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Accused Products
Abstract
A touch panel input apparatus has a touch panel which consists of X- and Y-direction electrode panels. When the apparatus is in a power-off state, one end of the X electrode panel is intermittently connected to a power source and one end of the Y electrode panel is intermittently grounded via an output resistor, in response to control signals outputted from a sampling circuit. In this state, synchronously with a clock signal, the sampling circuit performs sampling of a voltage developed across the output resistor when the two electrode panels are brought into contact. The sampling circuit outputs a power-on instruction signal to make the CPU perform the power-on operation. The sampling circuit stops its sampling operation once power is turned on.
34 Citations
20 Claims
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1. A touch panel input apparatus comprising:
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a touch panel including two electrode panels one of which has a resistance distribution uniform in an X-direction and the other of which has a resistance distribution uniform in a Y-direction; a touch panel control circuit for, in a power-off state of the apparatus, applying a first voltage to one end of one of the two electrode panels, and at the same time, applying a second voltage to one end of the other electrode panel via an output resistance, and sampling a voltage which is developed between both terminals of the output resistance when the two electrode panels have been brought into contact with each other; and wherein the touch panel control circuit includes; electrode panel control means for, in the power-off state of the apparatus, intermittently applying the first voltage to the one end of the one electrode panel synchronously with a clock signal, and at the same time, intermittently applying the second voltage to the one end of the other electrode panel via the output resistance; and sampling means for, in the power-off state of the apparatus, performing the sampling of the voltage synchronously with the clock signal and outputting a signal indicating whether or not the sampled voltage is equal to or higher than a predetermined level, wherein when the signal indicates that the sampled voltage is equal to or higher than the predetermined level, the signal is a power-on instruction signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A touch panel input apparatus comprising:
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a touch panel including two electrode panels one of which has a resistance distribution uniform in an X-direction and the other of which has a resistance distribution uniform in a Y-direction; electrode panel control means for, upon receipt of a control signal, alternately generating a voltage distribution in the two electrode panels, while in a power-off state of the apparatus, intermittently applying a first voltage to one end of one electrode panel synchronously with a clock signal, and at the same time, intermittently applying a second voltage to one end of the other electrode panel via an output resistance; position voltage detecting means for, when the voltage distribution is formed in each of said electrode panels by the electrode panel control means, detecting a position voltage generated in the electrode panel to which the voltage is not applied when the two electrode panels are brought into contact with each other at a point thereof; contact coordinate calculation means for calculating coordinates of a contact position on the touch panel, based on the position voltages detected by the position voltage detecting means and the voltage distributions of the respective electrode panels; sampling means for, synchronously with the clock signal, sampling a voltage which is developed between both terminals of the output resistance when the two electrode panels have been brought into contact with each other, and outputting the control signal to the electrode panel control means when the sampled voltage is equal to or higher than a predetermined level; and power-on means for executing a power-on operation to turn on power. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification