Color Filter Blocking Structure for Low-Reflection Displays
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Solution Overview
Problem
Existing display devices face challenges in reducing external light reflection, which affects display efficiency and image quality, especially in thin and flexible display configurations.
Innovation Solution
A display device design that includes a display panel divided into light emitting and non-light emitting regions, with a color filter layer featuring filter parts overlapping light emitting regions and a blocking part overlapping the non-light emitting region. The blocking part is formed by stacking portions of different color filters and has an optical density of 3.0 to 5.0, reducing external light reflection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If a single-layer color filter is used to maintain thin display structure, then device thickness is reduced, but external light reflection increases
Solution Approach 1:
The patent transitions from a single-layer color filter to a multi-layer stacked structure, adding the dimension of layer stacking. The blocking part is formed by stacking a first color filter layer and a second color filter layer, which increases the optical path length and light absorption capacity without significantly increasing the overall device thickness, thereby reducing external light reflection effectively.
Solution Approach 2:
The patent employs composite material structure by combining different color filter layers (first color filter and second color filter) to form the blocking part. This composite structure enhances the optical density and light blocking capability, achieving superior reflection reduction compared to single-material filters while maintaining thin profile.
2Object-affected harmful factors
If multiple color filters are stacked to reduce light reflection, then optical density increases, but manufacturing complexity increases
Solution Approach 1:
The patent divides the blocking part into multiple segmented color filter layers (first color filter layer and second color filter layer). Each layer can be manufactured and optimized independently, allowing for better control of optical properties and easier integration into the existing display manufacturing process, thus managing complexity through modular design.
Solution Approach 2:
The stacked color filter structure serves multiple functions: it acts as both the color filtering layer for light emission regions and the blocking layer for non-light emitting regions. This multi-functionality reduces the need for separate blocking structures, simplifying the overall device architecture despite the layered construction.
3Object-affected harmful factors
If blocking part thickness is increased to reduce reflection, then optical density improves, but display device thickness increases
Solution Approach 1:
The patent applies different quality characteristics to different regions: the blocking part (composed of stacked color filters) has higher optical density and greater thickness specifically at the non-light emitting regions, while the light emitting regions maintain thinner single-layer color filters. This localized optimization reduces reflection where needed without compromising overall device thinness.
Solution Approach 2:
Instead of uniformly increasing blocking part thickness, the patent utilizes the stacking dimension to achieve higher optical density. By stacking color filter layers vertically, the patent increases the effective light-blocking path length without proportionally increasing the horizontal footprint or overall device thickness, thus managing the thickness-reflection trade-off effectively.
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 proposed solution effectively reduces external light reflection, enhancing display efficiency and image quality while maintaining a thin and flexible display form factor.
Implementation Method 1
The blocking part has an optical density of about 3.0 to about 5.0, and a reflectance to external light of about 0.1 or less
Data Source
AI summary
Provided is a display device including a display panel divided into a plurality of light emitting regions in which a plurality of light emitting elements are disposed and a non-light emitting region adjacent to the light emitting regions, and a color filter layer disposed on the display panel. The color filter layer includes a plurality of filter parts which overlap the light emitting regions, respectively, and in which a single type of color filters is disposed, respectively, and a blocking part which overlaps the non-light emitting region and in which at least two color filters overlap. The blocking part has a thickness of about 3.0 μm to about 10.0 μm, and an optical density of about 3.0 or more.