Input Device Voltage Divider Circuit Eliminates Discharge Delay
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Solution Overview
Problem
Existing input devices with charge accumulation units require a discharging period, leading to lengthy measurement times due to the need for charge discharge after accumulation, which prolongs each measurement operation.
Innovation Solution
The input device employs a voltage divider circuit with a resistive sensor and capacitors, where alternate driving voltages are supplied at specific intervals, eliminating the need for a discharging period by detecting charge changes during voltage transitions, thereby shortening the measurement period.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a charge accumulation unit is used to measure pressure, then measurement capability is achieved, but measurement time becomes long due to required discharging period
Solution Approach 1:
The patent applies periodic action by alternately supplying first and second driving voltages to the voltage divider circuit at certain time intervals. This periodic voltage switching enables the capacitor to charge and discharge automatically during each cycle, eliminating the need for a separate discharging period and allowing measurement to be completed during the charging phase only, thus reducing overall measurement time while maintaining pressure measurement capability
2Reliability
If a discharging period is provided for the capacitor, then charge is properly reset, but measurement period becomes longer
Solution Approach 1:
The patent merges the discharging function with the periodic voltage switching operation. By alternately applying first and second driving voltages, the capacitor naturally charges during one voltage state and discharges during the other voltage state within the same periodic cycle. This combines what were previously separate charging and discharging operations into a single integrated periodic process, eliminating the need for an additional discharging period while ensuring proper charge reset
Solution Approach 2:
The patent achieves continuity of useful action by ensuring that during each periodic cycle, the capacitor is continuously utilized - charging during the first driving voltage phase and discharging during the second driving voltage phase. This continuous utilization eliminates idle discharging periods separate from measurement, as the discharging occurs concurrently with the periodic operation rather than as a separate reset step, thereby reducing total measurement period while maintaining reliable charge management
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration allows for more prompt measurement completion by eliminating the need for a discharging period, reducing overall measurement time and enhancing operational efficiency.
Implementation Method 1
a sensing device whose resistance changes in accordance with changes in pressure
Implementation Method 2
A capacitor in the input device has a charge that changes in accordance with a change in the divider voltage
Data Source
AI summary
An input device includes a voltage divider circuit that includes a resistive sensor whose resistance changes in accordance with a change in pressure of a pressing operation and at least one resistor device and that, upon receiving driving voltage, generates a divider voltage according to the resistance of the resistive sensor device, a first driving circuit that alternately supplies, to the voltage divider circuit at certain time intervals, a first driving voltage and a second driving voltage for generating different divider voltages, a capacitor whose charge changes in accordance with a change in the divider voltage, and a first charge detection circuit that detects an amount of change in the charge of the capacitor at a time when the driving voltage changes from the first driving voltage to the second driving voltage and when the driving voltage changes from the second driving voltage to the first driving voltage.