Image Sensor Panel Spatially Separated OPDs Crosstalk
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Solution Overview
Problem
Current image sensor panels with organic photodiodes (OPDs) face issues of crosstalk and mechanical instability due to physical connections between neighboring pixels, which hinder the passage of backlight and affect performance.
Innovation Solution
A method of fabricating image sensor panels with spatially separated OPDs, involving slit coating of photosensitive material in a well structure, followed by exposure to varying air pressures to ensure proper placement and separation of photopixels, and forming a light block layer to prevent unwanted light interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If photosensitive pixels are physically connected to each other, then manufacturing is easier, but crosstalk occurs and mechanical stability deteriorates
Solution Approach 1:
The patent divides the photosensitive layer into discrete, spatially separated photopixels using a slit coating process. Each photopixel is formed in a separate well structure, physically isolating neighboring pixels to prevent crosstalk while maintaining manufacturing efficiency through the continuous coating process.
Solution Approach 2:
The patent introduces an insulating layer and well structure as intermediary elements between adjacent photopixels. These intermediaries provide physical separation and electrical isolation, preventing crosstalk while allowing the overall array to be manufactured in a single process batch.
2Reliability
If photosensitive pixels are spatially separated, then crosstalk is reduced and mechanical stability is improved, but backlight passage is hindered
Solution Approach 1:
The patent applies local quality by making the photosensitive layer transparent in non-pixel regions and opaque only within the well structures. This allows backlight to pass through the transparent areas between pixels while the localized photosensitive regions maintain their light-absorbing function, thus resolving the contradiction between separation and backlight transmission.
Solution Approach 2:
The patent utilizes optical property changes by making the photosensitive material transparent to backlight wavelengths in the separation regions while maintaining photosensitivity in the pixel regions. This selective optical transparency allows backlight passage through transparent areas while preserving pixel functionality.
3Ease of manufacture
If photosensitive material is coated over the entire surface, then coating process is simpler, but pixel separation and precision are compromised
Solution Approach 1:
The patent performs preliminary action by pre-forming well structures and insulating layers before coating the photosensitive material. This preliminary structuring guides the photosensitive material into precise pixel locations during the subsequent simple coating process, achieving both ease of manufacture and high precision through the pre-prepared template structures.
Solution Approach 2:
The patent employs self-service by designing the coating process where the photosensitive material automatically fills the pre-formed well structures through capillary action or gravity, eliminating the need for complex masking or alignment steps. The material self-organizes into precise pixel patterns based on the underlying well geometry.
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 reduces crosstalk, enhances mechanical stability, and allows for transparent areas in the image sensor panel, enabling effective backlight passage and improved performance.
Implementation Method 1
forming a photosensitive layer in the well
Data Source
AI summary
The present disclosure provides an image sensor panel (ISP) and a method for fabricating the image sensor panel (ISP). In one aspect, the method includes forming a well in an assembly, forming a bottom electrode in the well, forming a photosensitive layer in the well, and forming a top electrode over the photosensitive layer.