Resolution Test Card With Localized Color Block Angles
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current resolution test cards for camera modules, with a checkerboard layout, result in differing horizontal and vertical components of spatial frequency response (SFR) resolution at corner regions due to uniform deflection direction and angle of color blocks, affecting overall analysis and alignment accuracy.
Innovation Solution
A resolution test card design with a central square region and four corner regions, where color blocks have symmetrical inclination directions and angles, allowing consistent calculation formulas for SFR components, reducing the impact of lens components on SFR resolution and facilitating adaptive alignment compensation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a checkerboard layout with uniform deflection direction and angle is used for all color blocks, then the test card structure is simple and easy to manufacture, but the horizontal and vertical components of SFR resolution at corner regions differ greatly, affecting overall analysis accuracy
Solution Approach 1:
The patent applies local quality by differentiating the deflection angles of color blocks in different regions. Corner region color blocks use a first deflection angle (e.g., 45 degrees), while central region color blocks use a second deflection angle (e.g., 0 degrees). This local differentiation ensures that horizontal and vertical SFR resolution components are consistent across all regions, resolving the measurement precision issue while maintaining manufacturing feasibility.
2Device complexity
If the deflection direction and angle of all color blocks are the same, then the test card design is straightforward, but the SFR resolution analysis in corner regions shows great differences between horizontal and vertical components, impacting overall camera module evaluation
Solution Approach 1:
The patent implements local quality by assigning different deflection angles to color blocks based on their location. Corner region color blocks are configured with a first deflection angle to ensure proper alignment for diagonal SFR measurement, while central region color blocks use a second deflection angle for horizontal/vertical measurement. This localized configuration achieves consistent SFR resolution across all regions without significantly increasing design complexity.
Solution Approach 2:
The patent segments the test card into distinct regions (corner regions and central region) with different color block configurations. This segmentation allows each region to be optimized for its specific measurement requirements, ensuring that SFR resolution can be accurately measured in both corner and central regions without compromising overall measurement consistency.
3Productivity
If a traditional checkerboard layout is used, then testing multiple camera modules efficiently is enabled, but the uniform deflection pattern causes significant differences in SFR resolution between horizontal and vertical directions at corner regions
Solution Approach 1:
The patent maintains the checkerboard layout structure for efficient multi-camera module testing while applying local quality by configuring corner region color blocks with a first deflection angle and central region color blocks with a second deflection angle. This approach preserves the high productivity benefit of simultaneous multi-module testing while eliminating the SFR resolution inconsistency issue that plagued the traditional uniform deflection design.
Data Source
AI summary
A resolution test card for camera module includes a central region and a plurality of corner regions surrounding the central region. Both the central region and each corner region includes color blocks arranged in an array without gap. Each color block includes at least two straight edges. Any adjacent two color blocks sharing one straight edge in both the central region and each corner region have different colors. Any of the at least two straight edges is inclined relative to a first direction and a second direction perpendicular to the first direction; the at least two straight edges includes a first straight edge and a second straight edge perpendicular to each other.