Light Detection Device Dynamic Pixel Grouping
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Solution Overview
Problem
The existing light detection devices with a two-dimensional array of pixels connected through wirings have a limited output data amount, balancing detection speed and position accuracy, where increasing pixel reading number improves accuracy but decreases speed, and reducing it enhances speed but compromises accuracy.
Innovation Solution
A light detection device with a reading pixel setting unit that selects a suitable pixel group for signal data reading in subsequent frames based on initial frame data, using first and second reading units connected through first and second wirings, allowing for reduced pixel reading while maintaining accuracy through binning reading and dynamic grouping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of pixels performing reading is increased, then position detection accuracy is improved, but reading speed decreases
Solution Approach 1:
The patent divides the pixel array into multiple regions and performs reading operation by operation on different regions, rather than reading all pixels simultaneously. This segmentation allows the system to process pixels in manageable chunks, improving reading speed while maintaining the ability to achieve high position detection accuracy when needed.
Solution Approach 2:
The patent dynamically adjusts the reading strategy based on the detected position of the light spot. When the light spot is stationary or moves slowly, fewer pixels are read to maintain speed. When the light spot moves rapidly or requires high precision, more pixels are engaged for reading. This dynamic adaptation resolves the contradiction between speed and accuracy.
2Speed
If the number of pixels performing reading is reduced, then reading speed is improved, but position detection accuracy deteriorates
Solution Approach 1:
The patent applies partial action by reading only the necessary subset of pixels required for adequate position detection, rather than reading all pixels. By identifying the region containing the light spot and reading only pixels in or near that region, the system achieves sufficient detection accuracy with fewer pixels, thereby improving reading speed without sacrificing necessary precision.
Solution Approach 2:
The patent changes the parameter of pixel selection based on light spot position and movement characteristics. By adjusting which pixels are activated for reading based on real-time conditions, the system optimizes the balance between reading speed and position detection accuracy, avoiding the need to always use all pixels.
3Speed
If dynamic pixel grouping is implemented, then detection speed is improved, but device complexity increases
Solution Approach 1:
The patent performs preliminary identification of the light spot position before the reading operation. By detecting and marking the region containing the light spot in advance, the system prepares the data for subsequent selective reading, simplifying the control logic while enabling speed improvements through targeted pixel selection.
Solution Approach 2:
The patent uses feedback from light spot position detection to control which pixels are read. The detected position information feeds back into the reading control mechanism, dynamically determining the set of pixels to be read. This feedback loop enables automated optimization of reading speed without requiring complex manual control.
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
This approach improves detection speed while ensuring position detection accuracy by dynamically adjusting the pixel group for reading, reducing the frequency of grouping and enhancing processing speed.
Implementation Method 1
Each of the plurality of pixels individually includes a first photosensitive portion and a second photosensitive portion
Data Source
AI summary
A plurality of pixels are arranged two-dimensionally in a matrix and individually include a first photosensitive portion and a second photosensitive portion. A plurality of first wirings connect a plurality of first photosensitive portions to each other for every row. A plurality of second wirings connect a plurality of second photosensitive portions to each other for every column. A first reading unit 21 is arranged to read signal data through at least some of the plurality of first wirings. A second reading unit 31 is arranged to read signal data through at least some of the plurality of second wirings. The first reading unit 21 has a reading pixel setting unit 26 arranged to set, based on signal data read in the first frame, a pixel group for reading signal data in a second frame subsequent to a first frame from the plurality of pixels.