Touch Signal Encoding Circuit for Load-Free Driving Compatibility
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Solution Overview
Problem
In-cell touch panels face challenges with capacitive loading, which interferes with touch sensing signals, and existing encoding schemes conflict with load-free driving operations, necessitating an improved signal processing method.
Innovation Solution
A signal processing circuit and method that combines load-free driving signals with an appropriate encoding scheme, utilizing a multiplexer, driver/receiver circuits, and a summation circuit to generate and process touch sensing signals, allowing for simultaneous output of touch driving and load-free driving signals to reduce capacitive loading interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If an encoder/decoder with different phase driving signals is applied to reduce impulse noises, then impulse noise reduction is improved, but compatibility with load-free driving operation deteriorates
Solution Approach 1:
The sensing signals are divided into multiple groups, with different groups assigned different gains. This segmentation allows the system to apply differential gain processing to specific signal groups while maintaining uniform gain for other groups, thereby achieving noise reduction through encoding without conflicting with load-free driving requirements.
Solution Approach 2:
Different gain values are applied to different groups of sensing signals based on their spatial or functional characteristics. This local quality approach enables selective amplification or attenuation of specific signal groups, allowing the system to reduce impulse noise in certain regions while preserving load-free driving compatibility in others.
2Adaptability or versatility
If uniform gain is applied to all sensing signals, then load-free driving compatibility is maintained, but impulse noise reduction capability deteriorates
Solution Approach 1:
The sensing signals are segmented into multiple groups, allowing differential gain application to specific groups while maintaining uniform gain for others. This segmentation enables the system to achieve impulse noise reduction in targeted groups without compromising load-free driving compatibility in the broader system.
Solution Approach 2:
Different gain values are applied locally to specific groups of sensing signals rather than uniformly across all signals. This local quality differentiation allows the system to enhance impulse noise reduction capability in specific regions while preserving overall load-free driving compatibility.
3Object-affected harmful factors
If differential gain encoding is applied to reduce impulse noise, then impulse noise reduction is improved, but device complexity deteriorates
Solution Approach 1:
The encoding process is segmented into discrete gain application stages for different signal groups. This segmentation simplifies the overall encoding circuit by breaking down the complex differential gain process into manageable, modular stages, reducing device complexity while maintaining impulse noise reduction effectiveness.
Solution Approach 2:
The system changes the gain parameter selectively for different groups of sensing signals rather than applying complex transformations to all signals. This parameter-based approach simplifies the encoding circuit by using straightforward gain adjustments instead of complex signal processing operations.
Data Source
AI summary
A signal processing circuit includes a driving signal generator and an encoder. The driving signal generator is configured to generate a driving signal. The encoder includes a multiplexer, a plurality of driver/receiver circuits and a summation circuit. The multiplexer is configured to receive multiple sensing signals in response to the driving signal. Among the driver/receiver circuits, a first driver/receiver circuit is configured to receive at least one first sensing signal, and apply a first gain to the first sensing signal to generate a first encoded signal; and a second driver/receiver circuit is configured to receive at least one second sensing signal other than the first sensing signal, and apply a second gain different from the first gain to the second sensing signal to generate a second encoded signal. The summation circuit is configured to sum up the first encoded signal and the second encoded signal to generate an encoded data.