Pixel Array Shield-Line Layout for High-Density Image Readout
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Solution Overview
Problem
The structure of existing solid-state imaging devices faces challenges in increasing pixel density, leading to lower frame rates and increased cross-talk due to reduced pixel pitch, which necessitates a reduction in frame rate to maintain signal integrity.
Innovation Solution
The implementation of a pixel array with two signal lines per column, where the signal lines and a shield line are arranged along the row direction, allowing simultaneous readout of pixel signals and minimizing cross-talk, thereby preventing a decrease in frame rate even with increased pixel density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If pixel pitch is reduced to increase the number of pixels, then pixel density is improved, but frame rate decreases due to increased readout time
Solution Approach 1:
The pixel array is divided into multiple banks, with each bank having its own independent readout circuitry. This segmentation allows parallel readout of multiple pixel groups simultaneously, thereby maintaining frame rate despite increased total pixel count achieved through reduced pixel pitch
Solution Approach 2:
Signal lines are arranged in both row and column directions, creating a two-dimensional readout architecture. This dimensional expansion allows signals from multiple pixels to be read out concurrently through different pathways, increasing overall readout throughput and maintaining frame rate
2Quantity of substance
If pixel pitch is reduced to increase the number of pixels, then pixel density is improved, but cross-talk increases due to shortened distances between signal lines
Solution Approach 1:
Shield lines are introduced as intermediary elements positioned between adjacent signal lines. These shield lines act as electromagnetic barriers that block interference between neighboring signal lines, thereby preventing cross-talk even when pixel pitch is reduced and signal lines are placed closer together
Solution Approach 2:
The shield lines are strategically positioned only in specific locations where cross-talk is most problematic, such as between adjacent column signal lines. This localized approach to interference mitigation provides effective cross-talk prevention without adding excessive structural complexity throughout the entire pixel array
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 configuration enables the solid-state imaging device to maintain or increase frame rates while preventing cross-talk, allowing for higher pixel density without compromising signal integrity.
Implementation Method 1
light collected by a lens 502 passes through a color filter 503 that is transmissive to specific wavelengths, and produces holes in the photoelectric conversion film 505
Data Source
AI summary
An imaging device incudes a pixel array including pixels arranged in columns and rows, one of the columns including a first pixel in a first row and a second pixel in a second row; a first signal line, to which the first pixel is coupled, and a second signal line, to which the second pixel is coupled, extending in a column direction of the pixels; and a first shield line, to which the first pixel is coupled, extending in the column direction. The first signal line, the first shield line, and the second signal line are arranged along a row direction of the pixels in that order.