Pen Touch Electrode Timing for Fast and Accurate Display Sensing
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Solution Overview
Problem
Existing display devices struggle to accurately and rapidly detect touch inputs, especially with electronic pens, due to limitations in distinguishing between charging and sensing periods.
Innovation Solution
A display device with a touch sensing system that includes first and second pen touch electrodes arranged in parallel directions, a touch sensing circuit that supplies driving signals to these electrodes, and signal analysis units to detect variations in electromagnetic charges, allowing for rapid and accurate detection of electronic pen touches by distinguishing between charging and sensing periods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the touch sensing unit continuously monitors touch inputs, then the response speed is improved, but the accuracy in distinguishing charging and sensing periods deteriorates
Solution Approach 1:
The touch sensing circuit operates in periodic cycles, alternating between a charging period where electromagnetic charge is accumulated on the touch electrode and a sensing period where the charged state is measured to detect touch inputs. This periodic operation allows the system to distinguish between charging and sensing phases, enabling both rapid response and accurate period differentiation.
Solution Approach 2:
During the charging period, electromagnetic charge is preliminarily accumulated on the touch electrode before the sensing period begins. This preliminary charging action enables the subsequent sensing period to accurately detect touch inputs by measuring the charged state, thus improving both response speed and measurement precision.
2Measurement precision
If the touch sensing circuit distinguishes between charging and sensing periods, then the measurement precision is improved, but the device complexity increases
Solution Approach 1:
The touch sensing circuit merges the charging and sensing functions into a single integrated circuit that operates in alternating periods. By combining these functions in one circuit rather than using separate circuits for charging and sensing, the patent achieves precise period differentiation while minimizing the increase in device complexity.
Solution Approach 2:
The integrated touch sensing circuit uses periodic switching between charging and sensing modes to achieve precise measurement. The periodic operation allows the same circuit to perform both charging and sensing functions sequentially, avoiding the need for multiple separate circuits and thus limiting the increase in device complexity.
3Reliability
If the pen touch electrodes are driven to electromagnetically charge the electronic pen, then the reliability of touch detection is improved, but the energy consumption increases
Solution Approach 1:
The pen touch electrodes are driven in periodic cycles, alternating between charging periods when electromagnetic charge is accumulated and sensing periods when the charged state is measured. This periodic operation improves the reliability of touch detection by ensuring sufficient charge accumulation while limiting energy consumption through brief charging intervals rather than continuous driving.
Solution Approach 2:
Electromagnetic charge is preliminarily accumulated on the touch electrode during the charging period before the sensing period begins. This preliminary charging action ensures reliable touch detection by establishing sufficient charge state while consuming energy only during the brief charging interval, not continuously.
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 continuous and rapid detection of electronic pen touches by sensing charge and discharge amounts, improving the accuracy and speed of touch input recognition.
Implementation Method 1
the touch sensing circuit is configured to drive pen touch electrodes so that the electronic pen is electromagnetically charged
Data Source
AI summary
A display device including: a display panel in which a plurality of pixels are arranged in an image display area; a touch sensing unit disposed on a surface of the display panel, wherein the touch sensing unit is configured to sense a touch of an electronic pen; a display driving circuit configured to drive the pixels; and a touch sensing circuit configured to generate touch coordinate data by detecting a touch position of the electronic pen, wherein the touch sensing circuit is configured to drive pen touch electrodes so that the electronic pen is electromagnetically charged, and to recognize a touch and a touch position of the electronic pen by detecting a variation of a pen touch sensing signal of the pen touch electrodes.