Rear-Emission Display Stack With Single-Substrate Light Reflection
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Solution Overview
Problem
Existing display devices face challenges in efficiently manufacturing rear emission type light emitting display devices with improved manufacturing process efficiency and effective light emission through a single substrate configuration.
Innovation Solution
A display device design featuring a first substrate with sub-pixels, color filter layers, a bank layer, color control structures, and a reflective layer, where light emitting elements emit light that is reflected and emitted to the substrate's bottom surface, allowing for continuous layer stacking on a single substrate and enhancing manufacturing efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If multiple substrates are used for layer stacking in rear emission type display devices, then light emission efficiency is improved, but manufacturing complexity and process time increase due to substrate bonding requirements
Solution Approach 1:
The patent combines multiple functional layers (light emitting element layer, color control structure, reflective layer, bank layer, and color filter layer) onto a single substrate, eliminating the need for substrate bonding while maintaining rear emission light emission efficiency. This merging approach resolves the contradiction by achieving high light emission efficiency without the manufacturing complexity of multiple substrate assembly.
2Productivity
If continuous layer stacking is performed on a single substrate, then manufacturing efficiency is improved, but light emission performance may deteriorate due to substrate limitations
Solution Approach 1:
The patent employs a vertical stacking arrangement of multiple functional layers on a single substrate, utilizing the thickness dimension to organize components. This dimensional approach allows continuous layer stacking for improved manufacturing efficiency while maintaining optimal optical pathways and layer interactions for reliable light emission performance in rear emission type display devices.
3Illumination intensity
If a reflective layer is added to enable rear emission, then light emission effectiveness is improved, but device structure complexity increases
Solution Approach 1:
The reflective layer in the patent serves multiple functions: it reflects light for rear emission effectiveness, provides a structural boundary for layer stacking, and contributes to the overall device architecture. This multi-functionality approach resolves the contradiction by improving light emission effectiveness while minimizing the increase in device structure complexity through the integration of the reflective layer into the unified substrate structure.
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 enables a rear emission type display device with improved manufacturing efficiency and effective light emission through a single substrate configuration, reducing the need for additional substrate bonding processes.
Implementation Method 1
Light emitted from the first light emitting element layer may be reflected from the reflective layer while passing through the light transmitting layer and may be emitted to a bottom surface of the first substrate through the first color filter layer
Data Source
AI summary
A display device including: a first substrate on which a plurality of sub-pixels are located; a plurality of color filter layers on the first substrate; a bank layer including a first bank at a boundary between the plurality of sub-pixels and located on the color filter layers; a color control structure including a plurality of light transmitting layers and wavelength conversion layers in a region surrounded by the first bank on the color filter layer; a light emitting element layer between the color filter layer and the color control structure; a reflective layer on the color control structure; and a first electrode and a second electrode on the color filter layer and at least partially located at the same plane, wherein the light emitting element layer includes a plurality of light emitting elements, each of the light emitting elements having respective ends on the first and second electrodes.