Semi-Transmissive Color Filter for Display Diffraction Control
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Solution Overview
Problem
It is challenging to suppress color mixture caused by diffraction of light in full-color displays, especially when the size of light emitting elements is small, as existing methods struggle to effectively manage diffraction grating effects from black matrices.
Innovation Solution
A display design incorporating a color filter with a transmission color region and a semi-transmissive region at its part, where light passing through the adjacent transmission color region experiences a phase difference as it passes through the semi-transmissive region, thereby canceling out diffraction-induced color mixture.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a light-shielding black matrix is provided at the boundaries of the color filter to improve contrast, then contrast is improved, but diffraction occurs causing color mixture
Solution Approach 1:
The black matrix is divided into a first black matrix region and a second black matrix region with different optical properties. The first region has high light-shielding performance for contrast, while the second region has optimized light-shielding characteristics to reduce diffraction. This segmentation allows each region to perform its specialized function without compromising the other.
Solution Approach 2:
Different regions of the black matrix are assigned different optical characteristics. The first black matrix region prioritizes light shielding for contrast enhancement, while the second black matrix region is designed with specific optical properties to minimize diffraction effects. This local differentiation resolves the contradiction between contrast and diffraction suppression.
2Area of stationary object
If the size of light emitting elements is reduced to increase pixel density, then display resolution is improved, but diffraction-induced color mixture becomes more significant
Solution Approach 1:
The black matrix is segmented into two functional regions: the first region provides strong light shielding to maintain contrast in small pixel configurations, while the second region optimizes diffraction characteristics. This segmentation enables effective color mixture suppression even when light emitting elements are miniaturized for higher pixel density.
Solution Approach 2:
Different portions of the black matrix structure are optimized for different functions. The first black matrix region focuses on light absorption for contrast, while the second region is engineered with specific optical properties to reduce diffraction. This local optimization allows small light emitting elements to maintain color purity despite reduced size.
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 design effectively reduces color mixture and improves color purity, even with small light emitting elements, by managing diffraction and enhancing the color reproduction range.
Implementation Method 1
the black matrix serves as a diffraction grating, and light passing through the adjacent color filter diffracts, causing color mixture
Implementation Method 2
the part of the light entering the adjacent transmission color region passes through the semi-transmissive region. Therefore, there occurs a phase difference between the light passing through the adjacent transmission color region and the light passing through the adjacent transmission color region as well as the semi-transmissive region, which cancel out each other
Data Source
AI summary
A display capable of suppressing color mixture caused by the diffraction of the light passing through the adjacent transmission color region of the color filter, even when a size of a light emitting element is small, and an electronic device including the display are provided. The display includes a plurality of light emitting elements, and a color filter having a transmission color region facing the plurality of light emitting elements, and a semi-transmissive region provided at a part of the transmission color region.