Curved Insulating Layer Layout for Uniform Sub-Pixel Reflection
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Solution Overview
Problem
Display devices face challenges in maintaining uniform optical properties across sub-pixels due to external light reflection, leading to potential color light leakage.
Innovation Solution
The design includes a substrate with a first insulating layer and conductive layers featuring light blocking patterns, a second insulating layer with curved surfaces, and pixel electrodes positioned within these layers to ensure uniform optical properties across sub-pixels, achieved through a manufacturing process involving mask alignment and heat treatment to form grooves with specific widths and depths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional planar insulating layers are used, then manufacturing is simple, but sub-pixels exhibit different optical properties due to external light reflection
Solution Approach 1:
The patent applies curvature to the upper surface of the second insulating layer by forming concave curved surfaces in areas overlapping with pixel electrodes. This curvature design modifies the reflection path of external light, ensuring that light reflected from different sub-pixels converges to the same visual angle, thereby achieving uniform optical properties across all sub-pixels while maintaining a manageable manufacturing process through standard photolithography and etching techniques.
2Object-affected harmful factors
If light blocking patterns are added to conductive layers, then external light reflection is reduced, but manufacturing precision requirements increase
Solution Approach 1:
The patent implements light blocking patterns selectively in specific conductive layers (first, second, and third conductive layers) rather than uniformly across all layers. The patterns are localized to areas where they are most effective at preventing color light leakage, while maintaining transparency in other areas. This selective application reduces the overall manufacturing precision burden compared to complete light blocking, as critical alignment is only required in specific patterned regions.
3Object-affected harmful factors
If multiple conductive layers with light blocking patterns are used, then color light leakage is prevented, but device complexity increases
Solution Approach 1:
The patent divides the light blocking function across multiple conductive layers (first, second, and third conductive layers), with each layer containing specific light blocking patterns tailored to its position and function. This segmentation allows each layer to address specific reflection issues at different depths, preventing color light leakage more effectively than a single layer while maintaining reasonable complexity through modular design and standardized fabrication processes.
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 ensures that each sub-pixel exhibits the same optical properties when exposed to external light, preventing color light leakage by uniform reflection patterns.
Implementation Method 1
disposing a mask including a light transmitting area, a light blocking area, and a semi-light blocking area on the insulating-material layer, and irradiating light onto the insulating-material layer through the mask
Implementation Method 2
defining a groove in an insulating layer by heat-treating the insulating pattern
Data Source
AI summary
A display device includes a substrate, a first insulating layer on the substrate and including a flat upper surface, a first conductive layer on the substrate, the first conductive layer including first to third light blocking patterns separated from one another, a second insulating layer on the first conductive layer, and pixel electrodes on the second insulating layer. The pixel electrodes includes a first pixel electrode in a first color pixel and in the first light blocking pattern in a first direction in a plan view, and a second pixel electrode in a second color pixel and covering the second and third light blocking patterns in the first direction, the second insulating layer includes first and second areas respectively overlapping the first and second pixel electrodes, and each of the upper surfaces of the first and second areas includes a curved surface with a concave central portion.