Sensing Circuit Dynamic Merging for Stylus Position Accuracy
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Solution Overview
Problem
The existing touch panel sensing systems experience signal intensity drops when a stylus moves across the boundaries of merged sensor pads, leading to errors in determining the stylus position due to inconsistent signal reception.
Innovation Solution
A sensing circuit with dynamically adjustable merging patterns for sensor pads, controlled by a control circuit that switches between different merging configurations based on the stylus's movement to maintain consistent signal intensity across boundaries.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If multiple adjacent sensor pads are merged to receive sensing signals through the same channel, then the number of channels is reduced and device complexity is lowered, but signal intensity drops at the boundaries of the groups causing errors in stylus position determination
Solution Approach 1:
The patent implements dynamic switching between different merging patterns using switches (first switch, second switch, third switch, fourth switch, fifth switch, sixth switch) that can reconfigure which sensor pads are coupled to which front-end circuits based on detected stylus movement, making the merging configuration adaptive rather than static
Solution Approach 2:
The system changes the merging parameter by switching between a first merging pattern and a second merging pattern, where in the first pattern sensor pads are merged in one configuration and in the second pattern they are merged in a different configuration, thereby optimizing signal reception based on stylus position
2Device complexity
If sensor pads are merged into groups for stylus sensing, then the sensing circuit structure is simplified, but signal intensity drops occur at the boundaries of the groups leading to sensing errors
Solution Approach 1:
The patent employs dynamic reconfiguration of sensor pad grouping through multiple switches that can change the merging pattern based on detected stylus movement, transitioning between a first merging pattern and a second merging pattern to maintain signal consistency across boundary regions
Solution Approach 2:
The control circuit acts as an intermediary that detects stylus movement and dynamically adjusts the merging pattern by controlling the switches, mediating between the fixed hardware structure and the variable sensing requirements to prevent signal drops at boundaries
Data Source
AI summary
A sensing circuit, which is to be coupled to a plurality of sensor pads, includes a plurality of front-end circuits and a plurality of switches. The plurality of switches include first to sixth switches. The first switch is coupled between a first sensor pad and a first front-end circuit. The second switch is coupled between the first sensor pad and the first front-end circuit. The third switch is coupled between a second sensor pad and the first front-end circuit. The fourth switch is coupled between the second sensor pad and a second front-end circuit. The fifth switch is coupled between a third sensor pad and the second front-end circuit. The sixth switch is coupled between the third sensor pad and the second front-end circuit. Wherein, the first sensor pad, the second sensor pad, and the third sensor pad are deployed along a first direction.