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Charge transport device, touch induction device and method

A charge transfer and charge technology, applied in the field of touch sensing and touch sensing devices, can solve the problems of complex circuit structure, unable to reflect unknown capacitance size and change, etc.

Active Publication Date: 2007-10-24
TIANJIN SIGMA MICROELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] 1. Poor stability, because when the unknown capacitor is disturbed by the outside world, the amount of charge will change significantly, and the amount of charge often cannot reflect the size of the unknown capacitor
[0004] 2. High cost, high-precision ADC is required to measure the charge, the circuit structure is complex, and the cost is increased

Method used

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  • Charge transport device, touch induction device and method
  • Charge transport device, touch induction device and method
  • Charge transport device, touch induction device and method

Examples

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Effect test

Embodiment 1

[0061] FIG. 1 is a schematic diagram of a touch sensing device of the present invention. As shown in the figure, it includes: a sensing point 1, a charge transfer device 2, a comparator 3, a counter 4, a processor 5, and a third switch S3.

[0062]The sensing point 1 is used to sense the capacitance between different environments and the ground (gnd), thereby generating a sensing capacitance Cs. The sensing point 1 can be formed by PCB traces, and the PCB traces can be made into the shape shown in attached drawing 3, or can be made into the shape shown in attached drawing 4, so as to form the correct sensing capacitance and ensure the smoothness of the sensing action. reliability.

[0063] Since the capacitance Cs generated on the sensing point 1 is very small, and the amount of charge transferred each time is also very small, it is difficult to measure. The present invention provides a charge transfer device 2 capable of accumulating charge, which converts the sensing point...

Embodiment 2

[0082] Since the sensing capacitance Cs generated by the sensing point 1 may change with the temperature and humidity of the external environment, the charging time of the sensing point 1 will also change with the temperature and humidity of the environment where it is located. In this way, as the environment changes, the actual non-touch charging count value T nkn It will change slowly, and when the change difference is greater than the specified standard deviation value, it will also be mistaken for a touch action. In the same way, in the touch state, the environment is still affecting the value of the counter, which may change the value of the counter to a value without touch.

[0083] Therefore, in order to ensure accurate triggering and high sensitivity, it is necessary to evaluate the change of the sensing capacitance Cs generated by sensing point 1. In this way, it is necessary to continuously adjust the non-touch charging count value, and set the standard deviation val...

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Abstract

The disclosed touch sensing method comprises: 1. a counter runs, charges periodically the induction points to transfer electric charges to a second capacitor, compares voltage of the second capacitor with the reference value, and stops working to store the current value if the capacitor voltage over the reference; and 2 deciding whether the pressing is touch state or not, discharging the second capacitor, resetting the counter, and back to step 1. This invention has well precision.

Description

technical field [0001] The present invention relates to a charge transfer device and method, and further relates to a touch sensing device and a touch sensing method using the charge transfer device for touch sensing. The method and device can be applied to various integrated touch switches. Background technique [0002] At this stage, most of the implementation schemes of tact switches adopt the method of capacitance measurement. In the current capacitance sensing touch switch, the basic principle is to measure the amount of charge on the unknown capacitance, so as to determine the size of the unknown capacitance. This method has the following disadvantages: [0003] 1. Poor stability. When the unknown capacitor is disturbed by the outside world, the charge will change significantly, and the charge often cannot reflect the size of the unknown capacitor. [0004] 2. High cost, high-precision ADC is required to measure the charge, the circuit structure is complicated, and t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03K17/96H03K17/687H03K17/60H03K17/78
Inventor 李志谦
Owner TIANJIN SIGMA MICROELECTRONICS CO LTD
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