Optical Stylus Pressure Sensing via RF Transmission
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Solution Overview
Problem
Conventional touch panels require separate touch panels and display devices, limiting flexibility and convenience in user input, especially in designs that do not integrate both functions effectively.
Innovation Solution
A touch input system comprising an optical stylus with a pressure-sensitive mechanism, a transducer module, an RF transmitting module, and a battery module, which emits a light signal when pressed, and a display device with a RF receiving module and light sensor array to detect the stylus position and pressure, allowing for integrated touch input and output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional touch panels use separate touch panel and display device, then the display function is achieved, but the input flexibility and user convenience are limited
Solution Approach 1:
The patent combines the display device and touch panel into a single integrated unit. The touch panel is formed by arranging transparent conductive film patterns on the display device, allowing the same device to serve both display and touch input functions simultaneously, thereby improving user convenience while maintaining a unified device structure
Solution Approach 2:
The display device is designed to perform multiple functions: it serves as both the display screen and the touch-sensitive input surface. The transparent conductive film patterns enable the display device to detect touch inputs directly, making it a multi-functional device that eliminates the need for separate touch panels
2Measurement precision
If optical stylus emits light continuously, then the touch position detection is improved, but the energy consumption increases
Solution Approach 1:
The optical stylus emits light in periodic pulses rather than continuously. The light emitting unit is controlled to emit light at specific intervals, which allows the display device to detect touch position accurately during the emission periods while significantly reducing overall energy consumption compared to continuous light emission
Solution Approach 2:
The pulsed light emission is synchronized with the detection cycles of the display device, ensuring that light is emitted continuously during the periods when detection is needed, while remaining off during non-detection periods. This maintains measurement precision while optimizing energy usage
3Loss of information
If the stylus includes pressure sensing mechanism, transducer module, RF transmitting module, and battery module, then the pressure information transmission is achieved, but the stylus structure becomes more complex
Solution Approach 1:
The patent replaces complex mechanical pressure transmission mechanisms with a combination of simple pressure-sensitive material and RF wireless transmission. The pressure-sensitive material detects pressure changes, and the RF transmitting module wirelessly transmits this information to the display device, eliminating the need for complex mechanical linkages and reducing stylus structural complexity
Solution Approach 2:
The RF transmitting module acts as an intermediary between the pressure-sensitive material and the display device. Instead of directly transmitting mechanical pressure information through complex mechanical means, the RF module converts pressure data into wireless signals, simplifying the overall system architecture while maintaining accurate pressure information transmission
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
Enables flexible and convenient user input by transmitting pressure information wirelessly, allowing for variable line widths and improved interaction with display devices, enhancing the user experience.
Implementation Method 1
the stylus is suitable for sensing the depressing force by its pressure sensitive mechanism disposed in the tip of the stylus
Implementation Method 2
an RF transmitting module, and a battery module
Implementation Method 3
the built-in antenna receives the electrical signal within a predetermined frequency range
Implementation Method 4
a display device with a RF receiving module and light sensor array to detect the stylus position and pressure
Data Source
AI summary
A touch input system including a stylus and a display device is provided. The stylus includes a battery module, a touch portion, a transducer module and a RF transmitting module. When a contact pressure is acted on the touch portion, the touch portion is electrically connected to the battery module by the contact pressure and emits a light signal. The display region receives and reacts to the light signal, and the contact pressure is transformed into an electrical signal by the transducer module. The RF transmitting module is electrically connected to the transducer module and transmitting the electrical signal. The display device includes a display region and a RF receiving module.