Reflective Bank Structure in Displays for Light Loss Reduction
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Solution Overview
Problem
Current display devices face challenges in enhancing light efficiency due to light loss from the light emitting elements, as the light path is not optimized, leading to reduced luminance and durability under poor environmental conditions.
Innovation Solution
The display device incorporates a reflective pattern on the bank to reflect light emitted from the light emitting elements towards a capping layer, minimizing light loss by reducing the light path and integrating a light conversion pattern layer with color conversion particles to convert light into desired colors, while the pixel circuit, display element, and light conversion pattern layers are strategically positioned on the base layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If light emitting elements are used in display devices, then luminance and durability are improved, but light loss occurs due to unoptimized light path
Solution Approach 1:
The patent converts the harmful light loss into a beneficial effect by introducing a reflective pattern that redirects previously lost light toward the capping layer. The reflective pattern transforms the harmful scattered light into useful light that contributes to display luminance, thereby resolving the contradiction between maintaining high luminance and reducing light energy loss.
Solution Approach 2:
The patent addresses light path optimization by adding a dimensional element through the reflective pattern structure. By positioning the reflective pattern at specific locations and orientations within the display device layers, it creates new light propagation pathways in different spatial dimensions, redirecting light that would otherwise be lost toward the capping layer and improving overall light efficiency.
2Loss of energy
If a reflective pattern is added to reflect light towards the capping layer, then light efficiency is enhanced, but device complexity increases
Solution Approach 1:
The reflective pattern is designed to serve multiple functions within the display device: it reflects light toward the capping layer to improve efficiency, maintains compatibility with existing light emitting elements and color conversion layers, and can be integrated into various display device architectures. This multi-functionality allows the single component to address light efficiency enhancement without requiring multiple separate systems, thereby limiting the increase in device complexity.
3Illumination intensity
If light conversion pattern layer with color conversion particles is integrated, then desired colors are achieved, but manufacturing complexity increases
Solution Approach 1:
The patent merges the light conversion pattern layer containing color conversion particles with the existing display device architecture, integrating it into the stack between the light emitting elements and the capping layer. This merging approach allows the color conversion functionality to be added without creating a completely separate manufacturing process, as the layer can be deposited or formed using techniques compatible with standard display manufacturing workflows, thereby managing manufacturing complexity while achieving accurate color reproduction.
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 enhances light efficiency by reflecting light emitted from the light emitting elements towards the capping layer, minimizing light loss and improving the overall luminance and durability of the display device.
Implementation Method 1
a reflective pattern on the bank to reflect light emitted from the light emitting elements towards a capping layer
Implementation Method 2
a light conversion pattern layer with color conversion particles to convert light into desired colors
Data Source
AI summary
A display device includes a base layer including a display area and a non-display area; and pixels disposed in the display area, each of the pixels including sub-pixels. Each of the sub-pixels includes a pixel circuit layer and a display element layer disposed on the pixel circuit layer. The display element layer includes a partition wall disposed in each of the sub-pixels; a bank disposed between adjacent ones of the sub-pixels; a first electrode and a second electrode disposed on the partition wall and spaced apart from each other; a reflective pattern disposed on the bank; and at least one light emitting element disposed between the first electrode and the second electrode.