Auxiliary Layer Refractive Index for Display Panel Cross-Color Reduction
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Solution Overview
Problem
The existing display panels with a large distance between the light-emitting layer and the color conversion layer suffer from cross-color issues due to light emission from one sub-pixel incident on adjacent sub-pixels, leading to reduced color gamut and display brightness.
Innovation Solution
A display panel design featuring a light-emitting layer, an insulating material structure with alternating organic and inorganic layers, a color conversion layer, and an auxiliary layer with a refractive index lower than both organic and inorganic layers, which reduces light leakage by totally reflecting light emitted at larger angles, thereby minimizing cross-color and enhancing color gamut.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the distance between the light-emitting layer and the color conversion layer is increased, then the display panel achieves high resolution and high color gamut, but light emitted by one sub-pixel incidents on adjacent sub-pixels causing cross-color and reducing color gamut
Solution Approach 1:
An auxiliary layer with low refractive index (1.3-1.6) is introduced between the light-emitting layer and color conversion layer as an intermediary structure. This auxiliary layer, positioned adjacent to the shading portion, acts as a mediator to totally reflect oblique light at the interface, preventing cross-color while maintaining display brightness through optimized light management
Solution Approach 2:
The refractive index parameter of the auxiliary layer is specifically optimized to be lower than both the organic layer (1.7-1.9) and inorganic layer (1.8-2.0) to enable total internal reflection. By changing the refractive index parameter of the intervening layer, the system achieves effective light reflection at oblique angles without compromising overall light transmission
2Device complexity
If the distance between the light-emitting layer and the color conversion layer is increased, then the display panel structure allows for better light emission, but light leakage occurs reducing display brightness
Solution Approach 1:
The auxiliary layer converts the potentially harmful oblique light that would cause cross-color and light leakage into beneficial reflected light that is redirected toward the correct color conversion portion. By utilizing total internal reflection at the low-refractive-index interface, the structure transforms wasted light into useful light contribution
Solution Approach 2:
The display panel employs a composite multi-layer structure including organic layers (1.7-1.9), inorganic layers (1.8-2.0), and an auxiliary layer (1.3-1.6) with different refractive indices. This composite material approach creates optimized optical pathways through refractive index engineering, reducing light leakage while maintaining structural integrity
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 solution effectively reduces cross-color between adjacent sub-pixels, improves display brightness, and increases the color gamut by ensuring that less light is incident on adjacent sub-pixels, thereby enhancing the overall display performance.
Implementation Method 1
the auxiliary layer having a refractive index that is less than a refractive index of the organic layer in direct contact with the auxiliary layer and less than a refractive index of the inorganic layer in direct contact with the auxiliary layer
Data Source
AI summary
Disclosed are display panels and display apparatuses. A display panel includes a base substrate, a light-emitting layer located on the base substrate, an insulating material structure, a color conversion layer, and an auxiliary layer. The light-emitting layer includes a plurality of light-emitting structures arranged at intervals. The insulating material structure is located on a side of the light-emitting layer facing away from the base substrate, and includes organic and inorganic layers arranged alternately. The color conversion layer is located on a side of the insulating material structure facing away from the base substrate, and includes a plurality of color conversion portions with a shading portion located between adjacent color conversion portions. The auxiliary layer has an orthographic projection on the base substrate covering an orthographic projection of the shading portion on the base substrate, the auxiliary layer is in direct contact with adjacent organic and inorganic layers in the insulating material structure, respectively, and the auxiliary layer has a refractive index that is less than a refractive index of the organic layer in direct contact with the auxiliary layer and less than a refractive index of the inorganic layer in direct contact with the auxiliary layer.