Edge Column Differential Sensing for Odd-Count Display Panels
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Solution Overview
Problem
Electronic display panels with odd numbers of electrically similar columns face challenges in performing differential sensing due to the inability to pair every sense line, leading to residual noise and reduced signal quality.
Innovation Solution
Implementing 'dancing channels' that dynamically route sense lines to sense amplifiers at different points in time, allowing differential sensing across non-adjacent columns and accommodating odd numbers of electrically similar columns by using dummy columns or dedicated sensing channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If differential sensing is implemented on display panels with odd numbers of electrically similar columns, then common-mode noise can be cancelled out, but one sense line remains unpaired leading to residual noise
Solution Approach 1:
The patent implements dynamic routing of sense lines to sense amplifiers, where the routing configuration changes over time. This allows the system to adaptively pair sense lines for differential sensing and dynamically include or exclude particular sense lines from differential pairs based on the odd-numbered column configuration, thereby minimizing residual noise while maintaining noise cancellation benefits.
Solution Approach 2:
The patent segments the sense lines into different groups: some are paired for differential sensing while others are handled separately through dynamic routing. This segmentation allows the system to process odd-numbered columns by creating differential pairs where possible and managing the remaining unpaired sense line through alternative routing strategies.
2Device complexity
If single-ended display panel sensing is used, then the sensing system is simpler to implement, but a substantial amount of noise is detected on smaller displays with greater pixel density
Solution Approach 1:
The patent employs dynamic routing that switches between single-ended and differential sensing modes. During periods when noise cancellation is prioritized, the system configures differential pairs; during other periods, it uses simpler single-ended sensing. This dynamic approach balances the trade-off between system complexity and noise performance.
Solution Approach 2:
The patent implements periodic switching between different sensing configurations. The system alternates between single-ended sensing and differential sensing with dynamic routing, allowing it to periodically benefit from noise cancellation while maintaining operational simplicity during single-ended phases.
Data Source
AI summary
Electronic displays, systems, and methods that perform display panel sensing are provided. An electronic device may include processing circuitry that generates image data based at least in part on display panel sensing feedback and an electronic display. The electronic display may display the image data on pixels coupled to one of several sense lines. There may be an odd number of sense lines with common electrical characteristics. The electronic display may obtain display panel sense feedback at least in part by differentially sensing each one of the sense lines with sense lines with common electrical characteristics with another one of the sense lines the common electrical characteristics.