Electroluminescent Display Device with Charge Generating Layer
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Solution Overview
Problem
Conventional electroluminescent display devices require improvement in their application across various types of display devices, particularly in terms of efficiency and color representation, as they rely on light-emitting diodes that emit light based on organic or inorganic materials but lack optimal configurations for diverse color output.
Innovation Solution
The electroluminescent display device incorporates a structure with a lower substrate and insulating layer, featuring subpixels with two light-emitting layers that emit different colors, where one subpixel emits light from only one layer and another subpixel emits light from both layers, utilizing a color filter layer to convert white light into specific colors, thereby enhancing color representation and reducing material and process costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional light emitting diodes with single light emitting layer are used, then the device structure is simple, but the color representation capability is limited
Solution Approach 1:
The light emitting diode is segmented into multiple light emitting layers (first light emitting layer and second light emitting layer) that emit different colors. Each layer can be independently controlled to emit light, enabling diverse color representation while maintaining a manageable layered structure.
Solution Approach 2:
Multiple light emitting layers emitting different colors are merged into a single light emitting diode structure. The first light emitting layer and second light emitting layer are combined with shared electrodes and charge generating layer, achieving multi-color output without proportionally increasing overall device complexity.
2Adaptability or versatility
If multiple light emitting layers are used in each subpixel, then color representation is improved, but driving voltage increases
Solution Approach 1:
A charge generating layer is introduced as an intermediary between the first and second light emitting layers. This charge generating layer efficiently generates and distributes charge carriers to both light emitting layers, reducing the overall driving voltage requirement compared to direct connection methods while maintaining effective excitation of both layers.
3Adaptability or versatility
If multiple light emitting layers are used, then color output is enhanced, but power consumption increases
Solution Approach 1:
The charge generating layer serves as an efficient intermediary that minimizes energy loss in charge distribution to multiple light emitting layers. By optimizing charge carrier generation and transport between layers, power consumption is reduced while maintaining enhanced color output capability.
Solution Approach 2:
The invention optimizes material parameters and layer thickness of the charge generating layer to improve charge carrier mobility and reduce resistive losses. By adjusting these parameters, power consumption is minimized while maintaining effective excitation of both light emitting layers for enhanced color output.
4Illumination intensity
If conventional single-layer structure is used, then manufacturing is simple, but luminance is limited
Solution Approach 1:
The single light emitting layer is segmented into multiple specialized light emitting layers, each optimized for specific color emission. This segmentation enables each layer to contribute to overall luminance, achieving higher total luminance output while the modular layered structure remains manufacturable using standard deposition techniques.
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 allows for efficient color representation, reduces driving voltage, lowers power consumption, and increases luminance, while also simplifying the manufacturing process by using a two-color subpixel structure that can emit blue and white colors, thus addressing the limitations of conventional electroluminescent display devices.
Implementation Method 1
subpixels with two light-emitting layers that emit different colors
Implementation Method 2
utilizing a color filter layer to convert white light into specific colors
Data Source
AI summary
The present disclosure provides an electroluminescent display device comprising a lower substrate, an insulating layer and subpixels. The insulating layer is positioned on the lower substrate subpixels. The subpixels are positioned on the insulating layer and include light emitting diodes comprising at least two light emitting layers emitting different colors. The subpixels includes a first subpixel in which only one light emitting layer of the at least two light emitting layers emits light and a second subpixel in which both of two light emitting layers of the at least two light emitting layers emit light.