Sensor Chip Control Layout for Faster Pixel Array Driving
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Solution Overview
Problem
High-speed control of sensor elements in sensor chips is hindered by signal delays and slew rates due to the distance of driving elements from the sensor elements.
Innovation Solution
A sensor chip design featuring a pixel array unit with sensor elements arranged in an array pattern and a global control circuit where driving elements are aligned in one direction along the long side of the pixel array unit, connected to control lines for each column, reducing signal delays and improving slew rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If driving elements are arranged away from sensor elements, then device complexity is reduced, but control speed deteriorates due to signal delays and slew rates
Solution Approach 1:
The patent transitions from a two-dimensional planar arrangement to a three-dimensional stacked architecture, placing driving elements vertically above sensor elements in different layers. This dimensional change enables simultaneous reduction of horizontal distance and device complexity while maintaining fast control speed through short vertical signal paths.
Solution Approach 2:
The patent implements a layered stacked structure where driving elements and sensor elements are nested in vertical layers, with driving elements positioned in upper layers and sensor elements in lower layers. This nesting approach compactly integrates both elements in a small vertical space, reducing signal path length while maintaining functional separation.
2Speed
If driving elements are placed close to sensor elements, then control speed is improved, but device complexity increases
Solution Approach 1:
The patent resolves the complexity issue by moving the arrangement to the vertical dimension through stacking, rather than increasing horizontal density. This allows close proximity for fast control while maintaining simplified lateral interconnections and regular pixel array structures.
Solution Approach 2:
The patent segments the sensor chip into distinct functional layers: sensor element layers and driving element layers. This segmentation allows each layer to be optimized independently for its specific function while maintaining fast control through vertical proximity, reducing overall device complexity through modular design.
3Area of stationary object
If control lines are extended to reach distant sensor elements, then coverage is improved, but signal delay increases
Solution Approach 1:
The patent shortens signal paths by transitioning from horizontal routing to vertical routing through stacked layers. Control lines connect driving elements to sensor elements primarily in the vertical dimension, dramatically reducing signal delay while maintaining full coverage through the layered architecture.
Solution Approach 2:
The stacked layer structure nests driving elements and sensor elements in vertical proximity, allowing control lines to connect them through short vertical paths rather than extended horizontal routes. This nesting maintains comprehensive coverage while minimizing signal transmission distance and delay.
Data Source
AI summary
A sensor chip includes: a pixel array unit that has a rectangular-shaped area in which a plurality of sensor elements are arranged in an array pattern; and a global control circuit, in which driving elements simultaneously driving the sensor elements are arranged in one direction, and each of the driving elements is connected to a control line disposed for each one column of the sensor elements, that is arranged to have a longitudinal direction to be along a long side of the pixel array unit. For example, the present technology can be applied to ToF sensor.