Integrated Touch Display With Mixed-Frequency Pen Sensing
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Solution Overview
Problem
Current display devices require separate sensor layers or digitizer layers for touch sensing, which complicates their structure and increases manufacturing costs, while also limiting the accuracy and speed of touch sensing for both user body parts and electronic pens.
Innovation Solution
A display device with a touch sensing unit that uses a combination of driving signals of different frequency bands to sense touches from both user body parts and electronic pens, eliminating the need for a separate sensor layer by integrating touch sensing into the display panel, allowing for simultaneous charging and position sensing of the electronic pen during its discharging period.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate sensor layers or digitizer layers are used for touch sensing, then touch sensing functionality is achieved, but device structure becomes complex and manufacturing costs increase
Solution Approach 1:
The patent combines the display panel and touch sensing unit into a single integrated structure. The touch sensing unit is formed on the same substrate as the display panel, with transparent electrodes serving dual purposes as both display elements and touch sensing elements. This merging eliminates the need for separate sensor layers or digitizer layers, thereby reducing device structural complexity while maintaining touch sensing functionality.
Solution Approach 2:
The transparent electrodes in the display panel are designed to serve multiple functions: they act as both the display elements (for showing images) and the touch sensing elements (for detecting touches). By making the display electrodes universal for both display and touch sensing purposes, the patent eliminates the need for dedicated separate sensing layers, thus simplifying the overall device structure.
2Reliability
If separate sensor layers or digitizer layers are used for touch sensing, then touch sensing functionality is achieved, but manufacturing costs increase
Solution Approach 1:
The patent combines the display panel and touch sensing unit into a single integrated structure. The touch sensing unit is formed on the same substrate as the display panel, with transparent electrodes serving dual purposes as both display elements and touch sensing elements. This merging eliminates the need for separate sensor layers or digitizer layers, thereby reducing device structural complexity while maintaining touch sensing functionality.
Solution Approach 2:
The transparent electrodes in the display panel are designed to serve multiple functions: they act as both the display elements (for showing images) and the touch sensing elements (for detecting touches). By making the display electrodes universal for both display and touch sensing purposes, the patent eliminates the need for dedicated separate sensing layers, thus simplifying the overall device structure.
3Device complexity
If a single touch sensing unit is used for both body part and electronic pen touches, then device structure is simplified, but sensing accuracy and speed may be compromised
Solution Approach 1:
The patent employs periodic action by using different frequency bands for sensing different touch types. The touch sensing circuit alternates between sensing body part touches (using one frequency band) and electronic pen touches (using another frequency band) in periodic time slots. This allows a single touch sensing unit to accurately distinguish between different touch types without requiring separate sensing layers, thereby maintaining sensing accuracy while simplifying device structure.
Solution Approach 2:
The patent changes the frequency parameter of the driving signals to differentiate between body part touches and electronic pen touches. By assigning different frequency bands to different touch types and using frequency-selective sensing, the system achieves accurate touch detection with a single integrated sensing unit, resolving the contradiction between structural simplicity and sensing precision.
4Productivity
If mixed frequency band driving signals are used for touch sensing, then touch sensing speed and accuracy are enhanced, but signal processing complexity increases
Solution Approach 1:
The patent implements feedback mechanisms in the touch sensing circuit that automatically detect the frequency band of incoming touch signals and route them to appropriate processing paths. This feedback-based signal routing simplifies the overall signal processing complexity by enabling automatic frequency-based discrimination, allowing the system to achieve high touch sensing speed and accuracy without requiring complex manual signal processing configurations.
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 solution simplifies the display device structure, reduces thickness and manufacturing costs, and enhances touch sensing speed and accuracy for both user body parts and electronic pens by integrating touch sensing directly into the display panel.
Implementation Method 1
The touch sensing circuit senses the touch of the user's body part and allows the electronic pen to be charged during a touch electrode driving period by supplying touch driving signals generated by mixing driving signals of different frequency bands to touch electrodes during the touch electrode driving period
Implementation Method 2
a touch sensing unit disposed on a front surface of the display panel that senses a touch of a user's body part and a touch of an electronic pen
Data Source
AI summary
A display device includes a display panel including a plurality of pixels arranged in an image display area, a touch sensing unit disposed on a front surface of the display panel that senses a touch of a user's body part and a touch of an electronic pen, a display driving circuit that drives the pixels of the image display area, and a touch sensing circuit that generates touch coordinate data by detecting touch positions of the user's body part and the electronic pen. The touch sensing circuit senses the touch of the user's body part and allows the electronic pen to be charged during a touch electrode driving period by supplying touch driving signals generated by mixing driving signals of different frequency bands to touch electrodes during the touch electrode driving period.