Photosensor Charge Transfer Gate Overlap Control
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Solution Overview
Problem
Existing image sensors face challenges in improving time resolution and detection accuracy due to limitations in controlling charge transfer gates, especially when dealing with multiple light receiving parts arranged one-dimensionally or two-dimensionally.
Innovation Solution
A photosensor system that includes a light receiving part, a charge transfer gate, and a signal generation unit. The signal generation unit generates a charge transfer signal to control the charge transfer gate, ensuring it is in a charge transfer state during overlapping time ranges across different frames, thereby improving time resolution and detection accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the charge transfer gate is controlled to transfer electric charge in multiple time ranges across different frames, then the time resolution and detection accuracy are improved, but the device complexity increases
Solution Approach 1:
The charge transfer gate operates dynamically by switching between different time ranges across multiple frames. The control signal adjusts the operational state of the charge transfer gate based on the current frame and time range, enabling flexible control that improves detection accuracy while managing complexity through systematic state transitions.
Solution Approach 2:
The charge transfer gate operates in periodic cycles across different frames, with each frame containing multiple time ranges. This periodic operation allows systematic control of charge transfer timing, improving measurement precision through repeated cycles while maintaining manageable complexity through regular patterns.
2Area of stationary object
If multiple light receiving parts are arranged one-dimensionally or two-dimensionally, then the detection coverage is improved, but the circuit scale becomes enormous
Solution Approach 1:
The detection system is segmented into multiple light receiving parts arranged in one-dimensional or two-dimensional arrays. Each light receiving part can be independently controlled through the charge transfer gate, allowing the system to achieve large detection coverage while managing circuit complexity through modular segmentation.
Solution Approach 2:
The charge transfer gate serves multiple functions by controlling charge transfer across different time ranges and frames for multiple light receiving parts. This multi-functional control mechanism enables a single control structure to manage multiple detection elements, reducing overall circuit scale while maintaining extensive detection coverage.
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 proposed solution enhances the time resolution and detection accuracy of the photosensor system by overlapping charge transfer periods across frames, effectively addressing the limitations of existing technologies.
Implementation Method 1
a light receiving part configured to generate electric charge according to incident light
Data Source
AI summary
Provided is a photosensor including a light receiving part generating electric charge according to incident light, a charge transfer gate configured to transfer the electric charge generated in the light receiving part, and a signal generation unit configured to generate a charge transfer signal applied to the charge transfer gate, in which the signal generation unit generates the charge transfer signal so that the charge transfer gate is brought into a charge transfer state in a first time range of a first period belonging to an n-th (n is an integer of 1 or more) frame and the charge transfer gate is brought into a charge transfer state in a second time range of a second period belonging to an m-th (m is an integer of 1 or more different from n) frame.