Display Device Light-Focusing Layer for Color Purity
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Solution Overview
Problem
Existing display devices face challenges in achieving high color purity and reproducibility while minimizing energy loss, especially in large-scale manufacturing processes.
Innovation Solution
A display device configuration that includes an organic emission layer with defined pixel areas, a color filter layer with quantum dots, a first optical filter layer that transmits specific lights and blocks others, and a light-focusing layer to control light paths, thereby enhancing color accuracy and reducing energy loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If pixels are formed with different materials having different characteristics to individually emit primary color lights, then high color purity and high image quality are achieved, but manufacturing difficulty in large scale increases
Solution Approach 1:
The invention segments the color filter layer into multiple pixel areas (first pixel area, second pixel area, third pixel area) with distinct color filters (first color filter, second color filter, third color filter) for red, green, and blue light emission respectively. This segmentation allows each pixel to emit its primary color with high purity while maintaining a standardized layered structure that simplifies large-scale manufacturing processes.
Solution Approach 2:
The invention applies local quality by assigning different color filter characteristics to different pixel areas based on their specific emission requirements. Each pixel area has color filters optimized for its specific color (red, green, or blue), enabling high color purity for each individual pixel while the overall structure remains suitable for mass production.
2Productivity
If light from the light source passes through color filters to express colors, then manufacturing in large scale is effectively achieved, but luminance and color purity are deteriorated due to wide FWHM and energy loss
Solution Approach 1:
The color filter layer is segmented into multiple pixel areas with different color filters (first color filter for red, second color filter for green, third color filter for blue). This segmentation enables high color purity for each pixel while maintaining a standardized structure suitable for large-scale manufacturing.
Solution Approach 2:
The invention optimizes the parameters of the color filters by controlling their full width at half maximum (FWHM) to be 50 nm or less. This parameter optimization reduces energy loss and improves color purity while maintaining compatibility with large-scale manufacturing processes.
3Loss of energy
If a color filter layer is disposed close to the organic emission layer to minimize energy loss, then energy efficiency is improved, but manufacturing precision and alignment difficulty worsen
Solution Approach 1:
The invention introduces a light-focusing layer as an intermediary between the organic emission layer and the color filter layer. This light-focusing layer contains light-focusing parts that concentrate emitted light onto the corresponding color filters, reducing energy loss while the gap between layers provides manufacturing tolerance for alignment.
Solution Approach 2:
The invention adds a vertical dimension solution by introducing a light-focusing layer with optical elements (such as micro-lenses or prisms) that redirect light at different angles. This dimensional approach allows light from the organic emission layer to be focused onto the color filter layer even when a gap exists, reducing energy loss while maintaining alignment feasibility.
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 minimizes energy loss, improves color purity and reproducibility, and facilitates large-scale manufacturing processes by optimizing the display device's structural components.
Implementation Method 1
a light-focusing layer disposed between the color filter layer and the organic emission layer, where the light-focusing layer includes first to third light-focusing parts overlapping the first to third pixel areas, respectively
Implementation Method 2
where at least one of the first to third color filters includes quantum dots
Implementation Method 3
a first optical filter layer disposed on the color filter layer, where the first optical filter transmits at least one of the first light and the second light and reflects or absorbs the third light
Implementation Method 4
at least one of the first to third light-focusing parts may include a convex lens
Data Source
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AI summary
A display device (10) includes an organic emission layer (120) in which a first pixel area, a second pixel area and a third pixel area are defined, a color filter layer (130) disposed on the organic emission layer (120) and including first to third color filters overlapping the first to third pixel areas, respectively, where the first to third color filters emit first light to third light, respectively, a first optical filter layer (160) disposed on the color filter layer (130) and which transmits at least one of the first light and the second light and reflects or absorbs the third light, and a light-focusing layer (150) disposed between the color filter layer (130) and the organic emission layer (120) and including first to third light-focusing parts overlapping the first to third pixel areas, respectively, where at least one of the first to third color filters includes quantum dots.