Light Extraction Layer for Display Panel Front-Side Efficiency
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Quantum dot display devices face inefficiencies in light output due to light loss beyond a certain viewing angle, leading to reduced brightness and uneven light mixing at the front side of the display.
Innovation Solution
Incorporating a light extraction layer between the light emitting element layer and the color film layer to redirect light with a large viewing angle, converging blue, red, and green light to improve front-side light output efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a conventional display structure without light extraction layer is used, then the device structure is simpler, but light output efficiency at the front side is reduced due to light loss beyond viewing angle
Solution Approach 1:
A light extraction layer is introduced as an intermediary component between the quantum dot layer and the color filter layer. This layer contains light extraction structures (micro-prisms, convex structures, or reflective structures) that mediate the light path, redirecting oblique light rays toward the front side to improve light output efficiency without requiring fundamental changes to the overall display structure
Solution Approach 2:
The light extraction layer utilizes three-dimensional structural features (micro-prisms, convex structures with varying heights) to manipulate light in multiple dimensions. By creating depth and angular variation in the light path through these structured elements, the system redirects light that would otherwise be lost at oblique angles back toward the front viewing direction
2Illumination intensity
If light is allowed to emit in all directions, then viewing angle is wider, but brightness uniformity deteriorates due to uneven light mixing at the front side
Solution Approach 1:
The light extraction layer applies different structural characteristics to different regions or orientations of light paths. The micro-prism or convex structures are designed with specific geometries that selectively redirect light from particular angles, creating localized optimization of light distribution to achieve uniform brightness at the front side while preserving acceptable viewing angles
3Productivity
If a light extraction layer is added to converge light, then light output efficiency improves, but manufacturing complexity increases
Solution Approach 1:
The patent provides specific parameter ranges for the light extraction structures (e.g., height ratios between 0.1-1.0 times the layer thickness, specific geometric configurations) that can be adjusted to optimize light extraction efficiency while considering manufacturing capabilities. These parameter specifications enable balancing performance improvement with manufacturing 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
Enhances light emitting efficiency at the front side of the display by redirecting and converging light, reducing losses and improving brightness uniformity.
Implementation Method 1
a light extraction layer is provided between the color conversion layer and the color film layer to gather the light incident into the light extraction layer
Implementation Method 2
configured to converge at least one of the light of the first color and the light of the second color
Data Source
AI summary
Embodiments of the present disclosure provide a display panel and a display device. The display panel includes a first base substrate; a light emitting element layer, arranged on the first base substrate and configured to provide light of a first color; a color film layer, arranged at a side of the light emitting element layer away from the first base substrate; a color conversion layer, arranged between the light emitting element layer and the color film layer and configured to receive the light of the first color and convert at least part of the light of the first color into light of a second color; and a light extraction layer, arranged between the color conversion layer and the color film layer, and configured to converge at least one of the light of the first color and the light of the second color.