Touchscreen Display Pen Touch Sensing Circuit Noise Reduction
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Solution Overview
Problem
Existing touchscreen display devices face challenges in simultaneously providing efficient finger touch and pen touch functions due to panel interior noise, which affects touch sensitivity and accuracy during display driving.
Innovation Solution
A touchscreen display device with a touch driving circuit that drives common electrodes during pen touch sensing, performs sensing processing differently based on overlapping gate lines, and generates sensing data, while also reducing panel interior noise by skipping or modifying sensing processing during voltage changes in display driving.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If pen touch sensing is performed simultaneously with display driving, then touch detection capability is improved, but panel interior noise increases affecting sensing accuracy
Solution Approach 1:
The patent segments the sensing processing into different types based on gate line overlap conditions. When a gate line overlaps with the target common electrode, the system performs a different sensing processing (skipping or modifying) compared to when no gate line overlaps. This segmentation allows the system to handle noise-prone periods differently, improving overall sensing accuracy while maintaining simultaneous operation capability.
Solution Approach 2:
The patent changes the sensing processing parameters dynamically based on the gate line voltage state. When the gate line voltage is variable (indicating potential noise interference), the system modifies or skips sensing processing for that period. This parameter change approach allows the system to adapt to noise conditions while maintaining continuous operation, resolving the contradiction between versatility and precision.
2Measurement precision
If sensing processing is performed on all signal segments, then touch detection accuracy is improved, but power consumption and processing complexity increase
Solution Approach 1:
The patent applies partial action by performing sensing processing selectively on only those signal segments where gate lines do not overlap with target common electrodes. Instead of processing all signal segments uniformly, the system identifies and processes only the relevant segments, reducing overall processing complexity while maintaining detection accuracy for non-noisy periods.
Solution Approach 2:
The patent divides the signal processing into distinct segments based on gate line overlap conditions. By segmenting the processing tasks and applying different strategies to different segments (full processing for non-overlapping periods, skipped/modifying for overlapping periods), the system reduces overall complexity while preserving necessary accuracy.
3Illumination intensity
If gate lines with variable voltage are applied during display driving, then display performance is improved, but panel interior noise increases affecting touch sensing
Solution Approach 1:
The patent employs skipping by deliberately skipping sensing processing during periods when gate lines with variable voltage are applied and overlap with target common electrodes. By skipping the sensing operation during these noisy periods, the system allows display driving to proceed with full performance while avoiding the degradation of touch sensing accuracy caused by panel interior noise.
Solution Approach 2:
The patent extracts or removes the sensing processing step from periods where gate line voltage changes occur and overlap with target electrodes. By taking out the sensing operation during these problematic periods, the system prevents noise from affecting measurement accuracy while maintaining continuous display performance.
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 enables high pen touch sensitivity and accurate detection even during display driving, while reducing panel interior noise, ensuring proper image display without interference from touch sensing.
Implementation Method 1
receives a pen signal output from a pen through a target common electrode selected as a sensing target
Implementation Method 2
drives all or some of the plurality of common electrodes
Data Source
AI summary
Provided are a touchscreen display device, a touch driving circuit, and a pen touch sensing method. Sensing processing on a pen signal is performed in a different manner, depending on whether or not a gate line, through which a gate signal having a variable voltage is applied, overlaps with a common electrode selected as a sensing target. Even in the case in which an abnormal noise voltage is induced in the common electrode by panel interior noise while pen touch sensing is being performed during display driving, pen touch sensitivity is prevented from being reduced.