Chiral Liquid Crystal OLEDs for Cost-Effective Large Screen Displays
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The manufacturing process of active matrix OLED displays with photonic crystal structures is costly due to the need for multiple vacuum-deposited layers, despite the reduced number of manufacturing steps from using single-color OLEDs.
Innovation Solution
Replacing vacuum-deposited layered structures with a chiral liquid crystalline structure built by solvent casting and photopolymerization, using chiral liquid crystalline band edge emission enhanced OLEDs (C-OLEDs) with a helical structure that induces stimulated light emission, reducing the number of layers and manufacturing complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If vacuum-deposited layered structures are used to build photonic crystal structures, then the required photonic crystal structures can be formed, but the manufacturing cost increases due to the need for around sixteen layers
Solution Approach 1:
The patent replaces the mechanical vacuum deposition process with a chemical self-assembly process using chiral liquid crystalline materials. The chiral liquid crystal molecules spontaneously form the required photonic crystal structure through their inherent helical arrangement, eliminating the need for layer-by-layer vacuum deposition and reducing manufacturing complexity while maintaining structural precision.
Solution Approach 2:
The patent changes the fundamental approach from physical layer stacking to chemical structure formation. By using chiral liquid crystalline materials with specific molecular configurations, the photonic crystal structure emerges from the material's intrinsic properties rather than being constructed through multiple deposition layers, thereby simplifying the manufacturing process.
2Manufacturing precision
If around sixteen layers of transparent insulating layer are vacuum deposited to build photonic crystal structures, then the required structure is achieved, but the manufacturing process becomes costly
Solution Approach 1:
The patent replaces the costly and time-consuming vacuum deposition process with a simpler chemical coating and photopolymerization process. The chiral liquid crystalline material is applied as a coating and then cured to form the photonic crystal structure, significantly reducing manufacturing cost and complexity while achieving the required structural precision.
Solution Approach 2:
The chiral liquid crystalline material performs the dual function of both the structural building block and the photonic crystal formation agent. The material's inherent chiral structure automatically generates the required photonic crystal pattern upon photopolymerization, eliminating the need for complex multi-layer construction and reducing manufacturing costs.
3Productivity
If single-color OLEDs are used, then the number of manufacturing process steps is reduced, but the manufacturing cost increases due to multiple vacuum-deposited layers
Solution Approach 1:
The patent replaces the mechanical vacuum deposition process with a chemical self-assembly process using chiral liquid crystalline materials. This substitution maintains the productivity benefit of using single-color OLEDs while eliminating the complexity of depositing around sixteen layers, as the chiral liquid crystal structure forms the photonic crystal pattern in a single coating and curing step.
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 approach reduces manufacturing costs and maintains energy efficiency while enabling the production of high-power, well-collimated light emission for display devices, allowing for the creation of efficient and cost-effective RGB color pixels.
Implementation Method 1
a chiral liquid crystalline structure built by solvent casting and photopolymerization
Implementation Method 2
chiral liquid crystalline band edge emission enhanced OLEDs (C-OLEDs) with a helical structure that induces stimulated light emission
Implementation Method 3
photoluminescent overlays that are energized into light emission by absorption of light entitled by the OLEDs
Data Source
AI summary
A light emitting photonic crystal composed of chiral liquid crystalline material and having an organic light emitting diode and methods of making the same are disclosed. An organic light emitting diode disposed within a photonic structure having a band-gap, or stop-band, allows the photonic structure to emit light at wavelengths occurring at the edges of the band-gap.