Display Panel Optical Auxiliary Layer Resonance Compensation
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Solution Overview
Problem
Wearable electronic devices, such as head-mounted displays, face challenges in eliminating the screen door effect (SDE) and achieving improved display efficiency and lifetime due to the limitations in current display panel designs.
Innovation Solution
A display panel design featuring a circuit layer and a display element layer with specific light-emitting elements and a pixel-defining film arrangement, including an optical auxiliary layer and conductive layer configuration, which generates different colors and compensates for resonance distances to enhance display efficiency and prevent color mixing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional display panel designs are used, then manufacturing simplicity is maintained, but display efficiency and lifetime are insufficient
Solution Approach 1:
The display panel is divided into multiple functional layers including circuit layer, display element layer, pixel-defining film, and multiple light-emitting layers with auxiliary portions. Each layer performs a specific function, allowing optimization of display efficiency while maintaining manufacturing feasibility through modular construction
Solution Approach 2:
Different regions of the light-emitting elements have different structures - specifically, auxiliary portions are added to certain light-emitting layers in specific regions to prevent color mixing, while other regions maintain simpler structures. This localized modification improves display efficiency without requiring complete redesign of the entire panel
2Manufacturing precision
If light-emitting layers are arranged closely to improve resolution, then screen door effect is reduced, but color mixing between adjacent layers increases
Solution Approach 1:
Pixel-defining films are introduced as intermediary structures between adjacent light-emitting elements and layers. These films act as barriers that prevent color mixing while allowing the light-emitting layers to be arranged closely together, thus enabling high resolution without the screen door effect while eliminating color mixing through the intermediary pixel-defining structures
Solution Approach 2:
Instead of only increasing horizontal resolution by placing layers closer, the patent adds vertical dimension control through pixel-defining films and auxiliary portions that extend in the thickness direction. This multi-dimensional approach allows close spacing without color mixing
3Illumination intensity
If more light-emitting layers are added to increase color gamut, then display quality improves, but light efficiency and lifetime are reduced
Solution Approach 1:
The patent optimizes the thickness and material parameters of each light-emitting layer and auxiliary portion to achieve resonance conditions that enhance light extraction efficiency. By carefully controlling the optical parameters (thickness, refractive index) of each layer, the system maintains high color gamut with improved light efficiency, avoiding energy loss
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 design improves display efficiency and extends the display lifetime by reducing color mixing and increasing light efficiency, as demonstrated by increased blue, green, and red light efficiencies and overall white light efficiency.
Implementation Method 1
compensates for resonance distances to enhance display efficiency
Data Source
AI summary
Provided is a display panel including a circuit layer and a display element layer above the circuit layer. The display element layer may include a first light-emitting element, a second light-emitting element, and a pixel-defining film that are spaced apart in a direction perpendicular to the thickness direction. The first light-emitting element may include an optical auxiliary layer and a conductive layer sequentially stacked between the first electrode and the hole transport region, and the second light-emitting element may omit the optical auxiliary layer and the conductive layer. The optical auxiliary layer may be spaced apart from the hole transport region with the conductive layer interposed therebetween.