Backside Illumination Imaging Device Voltage-Controlled Filters
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Solution Overview
Problem
Conventional solid-state imaging devices have low resolution for narrowband light images due to limited detection capability at red and green color filter pixels, which affects the color resolution of images when exposed to narrowband light.
Innovation Solution
A backside illumination type solid-state imaging device with a semiconductor layer, electrode, wiring layer, and color filters, where a first voltage and a second voltage are selectively applied to enhance sensitivity to wavelengths of 450 nm or less, and the color filters have peak transmittance at blue and 450 nm or more, allowing for improved detection of narrowband light without compromising color image resolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If red and green color filters are made transparent to narrowband light wavelength (410 nm), then narrowband light detection resolution is improved, but color resolution of images deteriorates due to detection of red, green, and narrowband light at pixels
Solution Approach 1:
The patent applies dynamics by making the filter properties changeable through voltage control. The second filter's transmittance characteristics are dynamically adjusted by applying different voltages to the electrode, allowing the filter to switch between blocking and transmitting narrowband light based on operational requirements, thus resolving the contradiction between narrowband detection resolution and color resolution
Solution Approach 2:
The patent changes the physical parameter of the second filter's transmittance characteristics by applying different voltages. By adjusting the voltage applied to the electrode, the filter's peak transmittance wavelength and bandwidth are modified, enabling it to selectively transmit or block narrowband light while maintaining color image quality, thereby resolving the contradiction
2Device complexity
If a single filter structure is used for both color imaging and narrowband light detection, then device complexity is reduced, but detection precision for narrowband light is insufficient
Solution Approach 1:
The patent achieves multi-functionality by designing a single filter system with multiple filters where the second filter can perform dual functions: blocking narrowband light during color imaging mode and transmitting narrowband light during narrowband detection mode through voltage-controlled transmittance changes, thus reducing device complexity while maintaining high detection precision
Solution Approach 2:
The dynamic voltage control capability allows the second filter to adapt its transmittance characteristics for different operational modes, enabling a single filter structure to achieve both color imaging and narrowband light detection with high precision, resolving the contradiction between device complexity and detection precision
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
The device achieves high resolution for both narrowband light and color images by selectively applying voltages to the electrode, ensuring sensitivity to wavelengths below 450 nm and maintaining color image quality.
Implementation Method 1
a plurality of photoelectric conversion elements; Light incident on the semiconductor layer is incident on the photoelectric conversion elements
Implementation Method 2
The plurality of filters include a first filter and a second filter. The light transmittance of the first filter has a peak in a wavelength range corresponding to blue. The light transmittance of the second filter has a peak at a wavelength of 450 nm or more
Data Source
AI summary
The solid-state imaging device includes a semiconductor layer, an electrode, a wiring layer, a plurality of filters, an input terminal, and a voltage generation circuit. The voltage generation circuit generates a first voltage and a second voltage. The plurality of filters include a first filter and a second filter. The light transmittance of the first filter has a peak in a wavelength range corresponding to blue. The light transmittance of the second filter has a peak at a wavelength of 450 nm or more, and in the second filter, the transmittance of light having a wavelength of 450 nm or less is greater than the minimum value of the transmission of light having a wavelength longer than 450 nm. The first voltage and the second voltage are selectively applied to the electrode.