Solid-state imaging device high refractive index layer flare suppression
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Solution Overview
Problem
The existing solid-state imaging devices, particularly in chip scale package (CSP) structures, suffer from flare and coloring issues due to wavelength dependency and require complex and time-consuming wavelength control film formations.
Innovation Solution
A high refractive index layer with a refractive index higher than the protective substrate and surface layer of the solid-state imaging element is formed in the light incident direction to suppress flare and coloring, using materials like silicon nitride, metal oxides, or organic substances, and is integrated with a bonding resin to form a simplified configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a wavelength control film is formed using laminated film such as TiO/SiO, then flare can be suppressed, but a lot of man-hours are required to form the wavelength control film
Solution Approach 1:
The invention extracts and eliminates the need for complex wavelength control films from the package structure. By incorporating flare suppression functionality directly into the sealing glass through high refractive index material selection, the invention removes the separate wavelength control film component and its associated multi-step formation processes, significantly reducing manufacturing time and complexity.
Solution Approach 2:
The invention merges the flare suppression function with the sealing glass itself by selecting materials with refractive index higher than 1.7. This consolidation integrates multiple functions (sealing and optical control) into a single component, eliminating the need for separate wavelength control films and reducing the overall number of manufacturing steps.
2Object-affected harmful factors
If a wavelength control film is formed using laminated film such as TiO/SiO, then flare can be suppressed, but the configuration becomes complex
Solution Approach 1:
The invention extracts and removes the complex laminated wavelength control film structure from the package design. By using high refractive index sealing glass alone or in combination with a simple resin layer, the invention eliminates the multi-layer TiO/SiO film structure, significantly simplifying the overall device configuration while maintaining flare suppression effectiveness.
Solution Approach 2:
The invention merges the optical control function into the sealing glass by selecting high refractive index materials. This integration consolidates multiple components (sealing glass and wavelength control film) into a single functional element, reducing structural complexity and the number of interfaces while achieving the same optical control objectives.
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 reduces flare and associated coloring while simplifying the manufacturing process and reducing costs by eliminating the need for complex wavelength control films, resulting in improved imaging performance and device miniaturization.
Implementation Method 1
a high refractive index layer having a refractive index higher than a refractive index of any one of a transparent protective substrate and a surface layer of an imaging surface of a solid-state imaging element is formed in a prior stage of the solid-state imaging element in a light incident direction
Data Source
AI summary
The present disclosure relates to a solid-state imaging device, an imaging device, and an electronic apparatus that are capable of suppressing generation of flare and also suppressing coloring caused by the flare with a simple configuration. A high refractive index layer is formed between a solid-state imaging element and a transparent protective substrate (glass substrate). When reflected light caused by diffracted light generated from an on-chip lens is reflected at an interface with the high refractive index layer, the reflected light is entirely reflected at a surface layer that is a transparent protective substrate and then the reflected light is sufficiently attenuated before being incident again. Consequently, flare and coloring caused by the flare are suppressed. The present disclosure is adaptable to an imaging device.