Micro-Lens Shift Layout for Shading Compensation in Light Sensors
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Solution Overview
Problem
Existing light sensors with circular shifts between micro-lenses and pixels are inefficient in compensating shading effects, particularly with the reduction in pixel size and the adoption of asymmetric pixel shapes.
Innovation Solution
A method for manufacturing a light sensor that involves determining customized shifts between micro-lenses and pixels based on the distance from the optical center and the shape of the pixels, using simulation or measurement to optimize the light incident angle for improved response values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If circular shift is applied to compensate shading effect, then shading compensation is achieved for symmetric pixels, but compensation becomes inefficient for asymmetric pixel shapes and reduced pixel sizes
Solution Approach 1:
The patent applies asymmetry by determining different shift values for micro-lenses along different axes (first axis versus second axis) passing through the optical center. Instead of using a uniform circular shift pattern, the invention introduces asymmetric shift compensation that adapts to the asymmetric shape of pixels, thereby resolving the contradiction between maintaining shading compensation reliability and adapting to asymmetric pixel geometries
Solution Approach 2:
The patent implements local quality by assigning different shift values to micro-lenses based on their specific position and orientation relative to the optical center. Each micro-lens receives a customized shift value determined by its local geometric context and the incident light angle, rather than applying a global uniform shift. This localized approach enables effective shading compensation for asymmetric pixels while maintaining overall system performance
2Measurement precision
If pixel size is reduced to increase resolution, then image detail is improved, but shading compensation efficiency deteriorates with conventional circular shift methods
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the shift value parameter based on the incident light angle and pixel position. Instead of using a fixed circular shift pattern, the invention modifies the shift parameter according to the specific geometric conditions, enabling effective shading compensation even when pixel sizes are reduced. This parameter adaptation allows the system to maintain compensation efficiency despite smaller pixel dimensions
3Ease of manufacture
If uniform shift value is applied to all pixels at the same distance from optical center, then manufacturing is simplified, but shading compensation accuracy is reduced for asymmetric pixels
Solution Approach 1:
The patent implements local quality by determining shift values based on local geometric conditions (incident light angle, pixel position, and orientation) rather than applying a uniform shift pattern. This approach maintains manufacturing feasibility while significantly improving shading compensation accuracy for asymmetric pixels, as each micro-lens receives a shift value tailored to its specific local context
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 approach enhances the compensation of shading effects by considering the shape and orientation of pixels, leading to improved light response and reduced shading artifacts in light sensors.
Implementation Method 1
each micro-lens then focusing the incident light in its associated pixel
Implementation Method 2
Light sensor comprises a matrix of pixels each associated to a micro-lens
Data Source
AI summary
The present disclosure relates to a method of manufacturing a light sensor comprising a matrix of pixels each associated to a micro-lens having a shift with respect to the pixel. For each axis of a plurality of axes passing by the optical center of the matric, for each pixel on the axis, and for each of a plurality light incident angles, a response value of the pixel is obtained. Based on the response values, for each axis and each pixel on the axis, a first function providing the light incident angle for which the pixel has the best response value is determined. For each axis and each pixel on the axis, a second value of the shift for bringing closer the first function to a target function is determined. The sensor is manufactured using the second values of shift.