Electrochromic Image Sensor Stack for Adaptive Exposure Control
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Solution Overview
Problem
CMOS image sensors face challenges in optimizing exposure intensity due to changing levels of illuminance, leading to overexposure or underexposure, resulting in loss of image detail.
Innovation Solution
Incorporating an electrochromic layer stack that adjusts the intensity of incident light based on environmental illuminance levels, using an electrochromic layer with a transparent electrode, ion-storage layer, electrolyte layer, and electrochromic layer to modify optical transmittance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If no light intensity adjustment mechanism is used, then the device structure remains simple, but overexposure or underexposure occurs resulting in loss of image detail
Solution Approach 1:
An electrochromic layer is introduced as an intermediary component between the incident light and the photodiode. This layer dynamically adjusts its optical transmittance in response to control signals, mediating the light intensity that reaches the sensor to prevent overexposure and underexposure while maintaining relatively simple overall device architecture
Solution Approach 2:
The electrochromic layer provides dynamic adaptability by changing its optical properties in real-time based on environmental illuminance conditions. This dynamic adjustment capability allows the device to maintain optimal image quality across varying lighting conditions without requiring complex mechanical or optical switching mechanisms
2Adaptability or versatility
If electrochromic layer stack is added to adjust light intensity, then image quality is maintained across varying illuminance, but device complexity increases
Solution Approach 1:
The electrochromic layer serves multiple functions simultaneously: it acts as a variable optical attenuator, a protective element for the photodiode, and an adaptive filter that responds to environmental conditions. This multi-functionality reduces the need for separate components and mechanisms, thereby limiting the increase in device complexity while achieving broad adaptability to different illuminance levels
Solution Approach 2:
The electrochromic layer changes its optical transmittance parameter in response to applied voltage or environmental stimuli, enabling continuous adaptation to varying illuminance conditions. This parameter-based control mechanism provides versatile adaptability without requiring complex mechanical or optical systems
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
Enables dynamic adjustment of light intensity to match environmental conditions, preventing overexposure or underexposure and maintaining image quality across varying illuminance levels.
Implementation Method 1
an electrochromic layer with a transparent electrode, ion-storage layer, electrolyte layer, and electrochromic layer to modify optical transmittance
Data Source
AI summary
An image sensor device includes a pixel sensor array and an electrochromic layer stack over the pixel sensor array. An electrical input may be applied to the electrochromic layer stack to adjust the intensity of incident light received at the pixel sensors of the pixel sensor array. In this way, the electrochromic layer stack enables the intensity of incident light received at the pixel sensors of the pixel sensor array to be adjusted to a suitable level for the level of illuminance in the surrounding environment, and enables the intensity of incident light received at the pixel sensors of the pixel sensor array to be adapted to changes in the level of illuminance in the surrounding environment.