Touch Control Display Synchronous Driving Noise Reduction
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Solution Overview
Problem
The existing time division driving method for capacitive touch screens limits touch control signal detection time, leading to high detection frequency and increased noise, which affects the display quality of touch control display devices.
Innovation Solution
A touch control display device and method that synchronizes display driving and touch control detection, using a substrate with a touch control driving electrode block matrix and signal transmission lines to extend detection time and reduce signal frequency, thereby reducing noise and improving display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If time division driving method is used to separate display driving and touch control detection, then display quality is maintained, but touch control detection time is limited and noise increases
Solution Approach 1:
The patent merges display driving and touch control detection into a synchronous driving mode where both operations are performed simultaneously within the same time period. The display driving unit and touch control detection unit share the same time resources, allowing touch control detection to be performed during the display driving time period rather than requiring separate time slots. This eliminates the time limitation and reduces noise by lowering the detection frequency.
2Productivity
If time division driving method is used, then display driving and touch control detection are separated, but touch control detection frequency increases and noise is amplified
Solution Approach 1:
The patent implements periodic action by performing touch control detection at extended intervals through synchronous driving. Instead of continuous high-frequency detection in time division mode, the system performs detection periodically at lower frequency while maintaining display continuity. The touch control detection unit operates periodically within the display driving time period, reducing the detection frequency and consequently reducing noise.
3Duration of action of moving object
If synchronous driving is implemented, then touch control detection time is extended and noise is reduced, but additional electrode blocks and signal transmission lines are required
Solution Approach 1:
The patent applies segmentation by dividing the touch control driving electrodes into distinct blocks (first touch control driving electrode blocks and second touch control driving electrode blocks) that are selectively activated. The touch control driving electrode block matrix is segmented into multiple columns with specific blocks designated for synchronous detection during display driving. This segmented approach allows extended detection time without requiring a complete redesign of the entire electrode structure, only specific blocks and their associated signal transmission lines.
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 allows for extended touch control detection time and reduced signal transmission frequency, resulting in improved display quality and reduced noise in touch control display devices.
Implementation Method 1
The basic principle of the mutual capacitive touch screen is: applying voltage in a driving line side and detecting signal changes in a detection line side
Data Source
AI summary
Each column of a touch control driving electrode block matrix in a first substrate of the touch control display device includes first and second touch control driving electrode blocks. A first touch control driving signal is transmitted in turns to the first touch control driving electrode blocks in corresponding matrix columns of the touch control driving electrode block matrix. Gate lines corresponding to the first touch control driving electrode blocks which receive the first touch control driving signal are in a off state; when one gate line corresponding to the first touch control driving electrode block in one matrix column is in the off state, one gate line corresponding to the second touch control driving electrode block in the matrix column is in an on state. A second touch control driving signal is transmitted to the second touch control driving electrode blocks between adjacent display time periods.