Color Filter and Light-Blocking Layout for Low-Reflection Displays
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Solution Overview
Problem
Existing display devices, particularly emissive displays, suffer from undesirable reflection and reflection diffraction patterns due to the reflection of external light, which is not mitigated by the absence of a polarizer.
Innovation Solution
The display device incorporates a first and second light blocking layer with specific horizontal distances and thicknesses, along with a color filter, to reduce reflection and diffraction patterns by covering overlapping color filter areas and eliminating the need for a polarizer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a polarizer is used in a liquid crystal display to block light, then light blocking performance is improved, but the display structure becomes more complex and cannot be applied to emissive displays
Solution Approach 1:
The patent applies different properties to different regions: the pixel defining layer has light-blocking properties in non-emitting regions, while the color filter layer provides selective light transmission in emitting regions. This local differentiation achieves polarizer-like light control without requiring a polarizer film throughout the display.
Solution Approach 2:
The patent divides the light control function into separate layers: the pixel defining layer handles light blocking at the pixel level, while the color filter layer handles wavelength selection. This segmentation allows each layer to specialize in one function, achieving effective light control without a polarizer.
2Productivity
If color filters are positioned close together to increase display area, then productivity is improved, but reflection and diffraction patterns increase due to overlapping portions
Solution Approach 1:
The pixel defining layer acts as an intermediary structure between adjacent color filters. It provides physical separation and defines clear boundaries between pixels, preventing the overlapping that causes reflection and diffraction patterns while maintaining high display area utilization.
Solution Approach 2:
The pixel defining layer uses a black or dark-colored material that absorbs light rather than reflecting it. This color choice eliminates the reflection and diffraction issues that would occur at the boundaries between adjacent color filters of different colors.
3Object-generated harmful factors
If the horizontal distance between pixel defining layer and light blocking layer is increased to reduce reflection, then reflection diffraction pattern is minimized, but manufacturing precision requirements increase
Solution Approach 1:
The patent combines the pixel defining layer and the light blocking layer into an integrated structure where the pixel defining layer itself serves as the primary light blocking element. The color filter is positioned relative to this integrated structure, simplifying the positioning requirements compared to separating multiple independent layers.
Solution Approach 2:
The pixel defining layer is formed first as the foundation structure, establishing the horizontal distance reference. Subsequent layers are then positioned relative to this pre-established structure, which simplifies manufacturing precision requirements compared to positioning multiple layers independently.
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 configuration effectively reduces external light reflection and diffraction patterns, enhancing the display quality by minimizing scattering and reflection at overlapping color filter areas.
Implementation Method 1
an upper light blocking layer that has an upper opening corresponding to the color filter, wherein the upper light blocking layer overlaps an overlapping portion where adjacent color filters overlap each other in a plan view
Implementation Method 2
positioning the light blocking layer between adjacent color filters to prevent overlapping, thereby minimizing the reflection diffraction pattern
Implementation Method 3
a color filter disposed on the encapsulation layer
Data Source
AI summary
A display device includes a first electrode disposed on a substrate; a pixel defining layer that has an opening exposing the first electrode; a second electrode disposed on the pixel defining layer and the first electrode; an encapsulation layer that covers the second electrode; a color filter disposed on the encapsulation layer; and an upper light blocking layer that has an upper opening corresponding to the color filter, wherein the upper light blocking layer overlaps an overlapping portion where adjacent color filters overlap each other in a plan view.