Coil Stylus Touch Input for Precise Position Sensing Without Digitizers
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Solution Overview
Problem
Existing display devices face challenges in accurately detecting touch positions, particularly when using electronic pens, due to inefficiencies in touch signal transmission and reception, which can complicate the device structure and increase manufacturing costs.
Innovation Solution
A touch input device with a first signal transceiver of a pencil lead type, a second signal transceiver of a coil type, and a third signal transceiver of a ring type, along with a touch sensing unit, enhances touch signal transmission and reception efficiency, allowing precise detection of touch positions without a sensor layer or digitizer layer, thereby simplifying the device structure and reducing thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a sensor layer or digitizer layer is added to improve touch detection accuracy, then touch position detection precision is improved, but device structure complexity increases and manufacturing cost increases
Solution Approach 1:
The patent extracts the touch signal transmission and reception function from the traditional sensor layer/digitizer layer structure and integrates it into the existing display panel structure. The touch input device uses the display panel's own electrodes and circuits to detect touch positions, eliminating the need for separate sensor layers or digitizer layers while maintaining detection precision.
Solution Approach 2:
The patent merges the touch detection function with the display panel structure. The display panel's electrodes serve dual purposes: displaying images and detecting touch positions. This integration combines multiple functions into a single structure, reducing overall device complexity while improving touch detection accuracy.
2Measurement precision
If a sensor layer or digitizer layer is added to improve touch detection accuracy, then touch position detection precision is improved, but manufacturing cost increases
Solution Approach 1:
The patent removes the need for expensive sensor layers and digitizer layers by extracting the touch detection function and implementing it through the display panel's existing structure. This eliminates additional manufacturing steps and material costs while maintaining touch detection precision.
Solution Approach 2:
The patent makes the display panel electrodes multi-functional, serving both display and touch detection purposes. This universality eliminates the need for separate dedicated touch sensing components, thereby reducing manufacturing costs while maintaining detection accuracy.
3Productivity
If multiple signal transceivers are added to enhance touch signal transmission efficiency, then touch signal transmission efficiency is improved, but device complexity increases
Solution Approach 1:
The patent segments the signal transmission function into multiple specialized transceivers: a first signal transceiver for receiving touch driving signals, a second signal transceiver for transmitting touch data signals, and a third signal transceiver for receiving sensing signals. This segmentation allows each transceiver to be optimized for its specific function, improving overall transmission efficiency while managing complexity through functional specialization.
Solution Approach 2:
The patent implements periodic action through the touch input controller, which sequentially and repeatedly controls the operation of multiple signal transceivers. The controller alternates between having the first signal transceiver receive touch driving signals and having the second and third signal transceivers transmit and receive data/sensing signals, optimizing signal transmission efficiency through time-division multiplexing.
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
The solution increases touch accuracy and efficiency while reducing manufacturing costs by eliminating the need for additional layers, enabling precise detection of touch positions and generating pressure and tilt data through enhanced signal transceivers.
Implementation Method 1
the touch input device wirelessly receives the touch driving signals through the touch electrodes
Implementation Method 2
transmits the touch data signal to the touch electrodes during a preset touch data signal transmission period
Data Source
AI summary
A touch input device includes: a first signal transceiver including one end forming a pen tip and formed as a pen lead type; an insulating member which covers an outer surface of a main body of the first signal transceiver in a circular or polygonal cylindrical shape; a second signal transceiver which covers the insulating member in a coil shape; and a touch input controller setting a touch driving signal reception period of the first signal transceiver and a touch data signal transmission period of the first and second signal transceivers and sequentially and repeatedly controlling a touch driving signal reception operation of the first signal transceiver and a touch data signal transmission operation of the first and second signal transceivers.