Touch Display Device Dynamic Amplification Gain Adjustment
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Solution Overview
Problem
Conventional multi-touch methods in touch display devices often misinterpret multi-touch inputs as single touches due to overlapping touch sensing output signals when the distance between touch detection regions is narrow, resulting in low resolution and accuracy.
Innovation Solution
A touch display device and method that dynamically adjust the amplification gain of touch sensing signals based on the distance between adjacent touch peak values, using a touch controller to process digital touch sensing data and compare distances to a reference, thereby increasing amplification when distances are within a certain threshold and maintaining or adjusting it based on filter types for noise reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional multi-touch method is used with fixed amplification gain, then device complexity is reduced, but measurement precision deteriorates when touch regions are close
Solution Approach 1:
The patent applies dynamics by making the amplification gain variable rather than fixed. The touch sensing circuit dynamically adjusts the amplification gain based on the distance between touch peak values, allowing the system to adapt to different touch scenarios and improve measurement precision without requiring overly complex fixed-structure designs.
Solution Approach 2:
The patent changes the parameter of amplification gain from a constant value to a variable parameter that depends on touch peak distance. By adjusting this parameter based on detected touch conditions, the system achieves higher measurement precision for close touches while maintaining manageable complexity through a systematic adjustment approach.
2Measurement precision
If amplification gain is increased for close touches, then measurement precision improves, but noise sensitivity increases
Solution Approach 1:
The patent applies local quality by applying different amplification gain levels to different touch scenarios. Instead of uniformly increasing gain for all touches, the system selectively applies higher gain only when touch peak distance indicates close touches, while using lower gain for distant touches, thus improving precision where needed without universally increasing noise sensitivity.
Solution Approach 2:
The system uses feedback by continuously monitoring touch peak distances and adjusting amplification gain accordingly. This closed-loop approach allows the system to respond to actual touch conditions in real-time, increasing gain only when necessary for close touches and reducing it when touches are distant, thereby managing noise interference dynamically.
3Measurement precision
If dynamic amplification gain adjustment is implemented, then multi-touch resolution improves, but device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the touch detection process into distinct stages: initial touch detection, distance calculation between peak values, and conditional amplification gain adjustment. This segmented approach breaks down the complex dynamic adjustment process into manageable steps, improving adjacent touch detection capability while keeping each stage's complexity controllable.
Solution Approach 2:
The system performs preliminary action by first detecting touch peak positions and calculating their distances before adjusting amplification gain. This preliminary analysis allows the system to prepare appropriate gain settings in advance based on detected touch patterns, improving resolution for adjacent touches while avoiding unnecessary complex real-time adjustments.
Data Source
AI summary
A touch display device comprises a display panel including a plurality of touch electrodes, and a plurality of touch lines; a touch sensing circuit configured to generate a digital touch sensing output signal by accumulating touch sensing signals transmitted from the plurality of touch electrodes through the plurality of touch lines; and a touch controller configured to control a amplification gain of the touch sensing circuit by extracting a plurality of single touch sensing data having touch peak values from the digital touch sensing output signal and by comparing a distance of touch peak values between adjacent single touch sensing data to a predetermined reference distance.