Color Filter Array Clearance Variation for Shading Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Color shading, or color unevenness, occurs in multi-color filter arrays due to differences in white balance across image areas, affecting the quality of captured or displayed images.
Innovation Solution
A method for forming a color filter array involving the use of two or more color filter films with different clearances and widths, where the second color filter film is positioned between the first pair of color filters, and the thickness and positioning of these filters are adjusted to minimize differences in transmittance and sensitivity across the array.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If color filters are arranged in a multi-color filter array with uniform structure, then manufacturing is simplified, but color shading occurs due to white balance differences across areas
Solution Approach 1:
The patent applies local quality by making the clearances between color filters vary across different regions of the array. Specifically, clearances are designed to be larger in certain areas and smaller in others, which compensates for the white balance differences that occur in different regions. This spatial variation in clearance design allows each region to have optimized optical characteristics for its specific position in the array, thereby reducing color shading while maintaining manufacturability through a systematic design approach.
2Illumination intensity
If color filter clearances are made larger to improve light transmission, then transmittance increases, but sensitivity differences between pixels increase causing color shading
Solution Approach 1:
The patent applies parameter changes by systematically varying the clearance width parameter across different regions of the color filter array. Instead of using a uniform clearance throughout, the design incorporates different clearance widths in different areas to optimize the balance between light transmission and pixel sensitivity uniformity. This parameter variation allows each region to achieve optimal optical characteristics, improving overall transmittance while maintaining consistent pixel sensitivity and reducing color shading effects.
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 reduces color shading by minimizing differences in transmittance and sensitivity between pixels, leading to improved image quality by maintaining consistent color balance across the image area.
Implementation Method 1
The patterning of the first color filter film is performed by photolithography using a photomask
Data Source
AI summary
A display device includes a light emitting layer and color filter arrays. The color filter arrays comprise a first color filter array of a first color, and a second color filter array of a second color. The first color filter array comprises a first pair of color filters adjacent to each other with a first clearance therebetween and a second pair of color filters adjacent to each other with a second clearance therebetween. The second color filter array comprises a first color filter positioned between the first pair of color filters and a second color filter positioned between the second pair of color filters. A width of the first clearance is larger than a width of the second clearance. A width of the first color filter is larger than a width of the second color filter. The second color filter partially overlaps with the second pair of color filters.