Photoelectric Conversion Device Equipotential Peripheral Region
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Solution Overview
Problem
Conventional imaging devices face image quality degradation and potential breakdown due to charge leakage from the peripheral region into the pixel region, especially when defects in the photoelectric conversion film cause short circuits between wiring and electrodes.
Innovation Solution
A photoelectric conversion device design where the conductive layer is disposed between the wiring layer and the photoelectric conversion film in the peripheral region, ensuring the upper electrode and conductive layer are at the same potential, preventing charge leakage and reducing the risk of overheating and breakdown.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If wiring is connected at a potential higher than that of the upper electrode to prevent charge leakage into the pixel region, then image quality is improved, but the risk of heat generation and device breakdown due to short circuits increases
Solution Approach 1:
The conductive layer is configured to be at the same potential as the upper electrode (both connected to ground potential), eliminating potential differences that would cause charge leakage while preventing excessive voltage differences that could lead to heat generation and breakdown. This equipotential configuration resolves the contradiction by maintaining both image quality and device reliability.
2Reliability
If the photoelectric conversion film extends over the peripheral region with wiring at higher potential to attract charges, then charges are prevented from entering the pixel region, but overcurrent may cause heat generation and breakdown
Solution Approach 1:
By making the conductive layer equipotential with the upper electrode (both at ground potential), the invention eliminates the voltage difference that would drive excessive current flow. Charges are still contained in the peripheral region through the conductive layer's structure, but without the risk of overheating caused by large potential differences.
3Measurement precision
If wiring is disposed at higher voltage to create an electric field for charge attraction, then charge leakage into pixels is prevented, but short circuits through defects cause overcurrent and heat
Solution Approach 1:
The conductive layer is maintained at the same potential as the upper electrode (ground potential), creating an equipotential region that prevents charge leakage into pixel regions through proper field configuration without generating excessive currents. This eliminates the harmful heat effect while maintaining pixel signal accuracy.
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 effectively prevents image quality degradation and reduces the likelihood of device breakdown by maintaining zero potential between the conductive layer and the photoelectric conversion film, even when defects occur, thereby enhancing the reliability of the imaging device.
Implementation Method 1
when incident light is converted to charges in the photoelectric conversion film
Data Source
AI summary
A photoelectric conversion device including an effective pixel region including a plurality of effective pixels and a peripheral region provided outside the effective pixel region, the photoelectric conversion device comprising: a wiring layer; an upper electrode; and a photoelectric conversion film provided extensively over the effective pixel region and the peripheral region, wherein each of the plurality of effective pixels includes a pixel electrode disposed between the wiring layer and the photoelectric conversion film in a depth direction, the peripheral region includes a conductive layer disposed between the wiring layer and the photoelectric conversion film in the depth direction, and the upper electrode and the conductive layer are at a same potential.