Alternating Drive Electrode States for Electromagnetic Touch Sensitivity
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Solution Overview
Problem
Electromagnetic induction touch panels face reduced detection sensitivity due to insufficient charge in the pen's capacitance, leading to longer detection periods.
Innovation Solution
The input detection device employs a configuration with drive electrodes that alternate between two drive states, reversing the direction of the magnetic field generated, to improve detection sensitivity by ensuring continuous strong magnetic field generation and efficient charging of the pen's capacitance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional electromagnetic induction touch panel uses a single drive state for the drive electrode, then the structure is simple, but the detection sensitivity is reduced due to insufficient charge in the pen's capacitance
Solution Approach 1:
The drive electrode alternates between a first drive state and a second drive state periodically. In the first drive state, a first drive voltage is supplied to one end and a second drive voltage to the other end. In the second drive state, the voltages are reversed. This periodic alternation ensures continuous strong magnetic field generation, which improves the charging of the pen's capacitance and enhances detection sensitivity.
Solution Approach 2:
The drive electrode transitions dynamically between two distinct drive states rather than maintaining a static state. This dynamic switching allows the magnetic field generation to be continuous and strong, ensuring efficient charging of the pen's capacitance during both states, thereby improving detection sensitivity without requiring additional hardware.
2Measurement precision
If the detection period is extended to compensate for reduced detection sensitivity, then more charge can be accumulated in the pen's capacitance, but the overall detection efficiency decreases
Solution Approach 1:
The alternating drive states ensure that the magnetic field generation is continuous rather than intermittent. By switching between two drive states that both generate strong magnetic fields, the system maintains continuous charging of the pen's capacitance throughout the detection period, maximizing the utilization of the available time and improving detection efficiency.
Solution Approach 2:
The periodic alternation between drive states creates a continuous cycle of strong magnetic field generation and capacitance charging. This ensures that throughout the entire detection period, the pen's capacitance is being charged efficiently, allowing for shorter detection periods while maintaining high detection sensitivity.
3Measurement precision
If the charge quantity in the pen's capacitance is increased to improve detection sensitivity, then the detection precision improves, but the detection period becomes longer
Solution Approach 1:
The continuous alternation between drive states ensures that the magnetic field generation and capacitance charging occur continuously throughout the detection period. This maximizes the charging efficiency per unit time, allowing for rapid accumulation of charge in the pen's capacitance without extending the detection period.
Solution Approach 2:
The system changes the drive voltage parameters dynamically by switching between two distinct drive states with reversed voltage configurations. This parameter change ensures that strong magnetic fields are generated in both states, maintaining high charging efficiency and enabling rapid accumulation of charge in the pen's capacitance within a short detection period.
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 approach enhances detection sensitivity and reduces the time required for touch detection, allowing for larger display regions and improved display definition.
Implementation Method 1
a coil which generates a magnetic field (hereinafter also referred to as a magnetic field generation coil) and a coil which detects a magnetic field (hereinafter also referred to as a magnetic field detection coil). In addition, a pen, which is an external object, incorporates a coil and a capacitive element which constitute a resonance circuit. When the pen is in proximity to the input detection device, the magnetic field generation coil and the coil inside the pen are magnetically coupled to each other. In this case, when a current flowing through the magnetic field generation coil changes, an induction voltage is generated at the coil inside the pen due to electromagnetic induction
Implementation Method 2
when a current flowing through the magnetic field generation coil changes, an induction voltage is generated at the coil inside the pen due to electromagnetic induction, and the capacitive element inside the pen is charged
Implementation Method 3
a pen, which is an external object, incorporates a coil and a capacitive element which constitute a resonance circuit. According to the electric charge quantity charged in the capacitive element inside the pen, the coil inside the pen generates a magnetic field
Data Source
AI summary
An input detection device includes a plurality of drive electrodes which are arranged in parallel to each other in plan view, and each of which has a pair of ends. At least one drive electrode among the plurality of drive electrodes is driven such that a first drive state where a first drive voltage is supplied to one end of the drive electrode and a second drive voltage different from the first drive voltage is supplied to the other end of the drive electrode and a second drive state where the second drive voltage is supplied to the one end and the first drive voltage is supplied to the other end temporally alternately occur.