Touch Display Pen Tilt Sensing via Dual Signal Media
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional pen touch technologies inaccurately sense pen coordinates when used at a tilted angle, leading to erroneous operations due to coordinate errors, particularly affecting right- and left-handed users.
Innovation Solution
A touch display device and pen system utilizing two signal transmission media, a tip and a ring, with a touch circuit that receives downlink signals from both to accurately sense pen tilt and coordinates by correcting signal strength differences and phase differences between the tip and ring signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single signal transmission medium (tip only) is used in conventional pen touch technology, then the device complexity is low, but the measurement precision of pen coordinates deteriorates when the pen is tilted
Solution Approach 1:
The pen's signal transmission function is segmented into two independent media: the tip and the ring. Each medium transmits signals independently to the touch panel, allowing the system to distinguish between the positions of tip and ring. This segmentation enables accurate coordinate detection even when the pen is tilted, as the differential positioning of tip and ring provides tilt information.
Solution Approach 2:
The invention adds a spatial dimension to pen signaling by introducing the ring as a second transmission medium positioned differently from the tip. This creates a three-dimensional signal structure where the relative positions of tip and ring signals provide both two-dimensional coordinates and tilt angle information, transforming a 2D coordinate problem into a 3D spatial problem.
2Measurement precision
If two signal transmission media (tip and ring) are used to accurately sense pen tilt, then the measurement precision improves, but the device complexity increases
Solution Approach 1:
The touch panel receives signals from both tip and ring, calculates their positional relationship, and uses this feedback to determine pen tilt angle and coordinates. The system continuously monitors the signal strength and position of both media, providing real-time feedback for accurate tilt detection and coordinate correction.
Solution Approach 2:
The dual-media pen structure serves multiple functions simultaneously: it provides basic touch coordinates, detects pen tilt angle, and enables both time-division and simultaneous driving modes. The same tip and ring structure can operate in different modes depending on system requirements, making the design universally applicable for various sensing needs.
3Productivity
If two signal transmission media are driven simultaneously, then the productivity of pen sensing is improved, but the device complexity increases
Solution Approach 1:
The system dynamically switches between time-division driving mode and simultaneous driving mode based on operational requirements. The driving circuit can adaptively select the appropriate mode, providing flexibility in performance and complexity management. This dynamic capability allows the system to optimize between speed and power consumption as needed.
Solution Approach 2:
In time-division driving mode, the tip and ring are driven alternately in periodic cycles rather than simultaneously. This periodic action reduces the instantaneous complexity of the driving circuit while maintaining the ability to detect both signals. The systematic alternation allows simple circuit design to handle complex dual-media signaling requirements.
Data Source
AI summary
The aspects of the present disclosure relate to a touch display device, a touch system, a touch driving circuit, a pen, and a pen sensing method, and more particularly, to a touch display device, a touch system, a touch driving circuit, a pen, and a pen sensing method, which may receive a first downlink signal and a second downlink signal output from a pen through all or some of a plurality of touch electrodes and may sense the pen based on received signal strength for each touch electrode for the first downlink signal and received signal strength for each touch electrode for the second downlink signal. According to the aspects of the present disclosure, the pen may be accurately sensed even when a user uses the pen in a tilted manner.