Movable Lens Camera Module for Bayer Sub-Pixel Resolution
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Solution Overview
Problem
Existing camera modules face limitations in improving imaging resolution due to fixed pixel sizes, leading to reduced photosensitivity and image quality issues from single-frame interpolation and pixel displacement in multi-frame synthesis.
Innovation Solution
A camera module design featuring a lens that switches between multiple positions relative to a Bayer array sensor, allowing formation of images with the same content but different colors in different sub-pixel areas, enhancing image resolution through increased real photosensitive pixels by synthesizing these images with a preset algorithm.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the quantity of pixels is increased to improve imaging resolution, then the resolution is improved, but photosensitivity is reduced and image quality deteriorates
Solution Approach 1:
The lens is made movable relative to the photosensitive chip through a driving mechanism, allowing dynamic switching between different imaging positions. This enables the system to capture multiple images at different pixel locations and synthesize them, achieving high resolution without increasing pixel density, thus maintaining photosensitivity.
Solution Approach 2:
Instead of increasing resolution by adding more pixels in the same plane (2D density increase), the invention introduces a third dimension by moving the lens along the optical axis to different positions. This allows capturing the same scene from multiple focal depths and synthesizing a high-resolution image, effectively adding dimensional freedom to the imaging process.
2Measurement precision
If single-frame interpolation is used to improve resolution, then resolution is improved, but interpolation errors occur and image quality deteriorates in some scenes
Solution Approach 1:
The system captures multiple real copies of the same scene by moving the lens to different positions and synthesizing them. These are actual optical copies captured at different moments and positions, not algorithmic interpolations. This provides genuine multiple samples of the scene that can be reliably combined to achieve high resolution without interpolation errors.
3Measurement precision
If multi-frame synthesis is used to improve resolution, then resolution is improved, but pixel displacement control is difficult and image quality after synthesis is poor
Solution Approach 1:
The system incorporates a driving mechanism that precisely controls lens movement and a control unit that coordinates the multi-frame synthesis process. The feedback control ensures accurate pixel displacement between frames, making the complex multi-frame synthesis process automated and precise, thereby improving image quality after synthesis.
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 solution improves image resolution by increasing real photosensitive pixels, resulting in better image quality and user experience, with potential tripled resolution for R and B images and doubled resolution for G images.
Implementation Method 1
the lens can switch between a first position and a second position relative to the photosensitive chip. In a case that the lens is at the first position, light incident from the lens forms a first image in a first sub pixel area of the photosensitive chip. In a case that the lens is at the second position, the light incident from the lens form a second image in a second sub pixel area of the photosensitive chip
Data Source
AI summary
Electronic device and camera module thereof are provided. Camera module includes lens, driving member, and photosensitive chip which is Bayer array sensor and includes pixel areas in rows and columns, and each pixel area includes four sub pixel areas. Lens is connected to driving member that can drive lens to switch between first position and second position relative to photosensitive chip. If lens is at first position, light incident from lens forms first image in first sub pixel area of photosensitive chip. If lens is at second position, light incident from lens forms second image in second sub pixel area of photosensitive chip. Content of first image is same as that of second image. Equivalent sub pixel areas of first and second sub pixel areas in one pixel area are any two sub pixel areas in the pixel area.