Display Device Color Conversion Layer Barrier and Low Refractive Structure
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Solution Overview
Problem
Current display devices face challenges in enhancing display quality due to unreliable color conversion layers, which affect the overall luminance and reliability of the display.
Innovation Solution
A display device structure incorporating a color conversion layer with a barrier layer made of silicon oxide (SiOx) having cured polysilazane, a low refractive layer, and a capping layer, all sequentially disposed to improve the reliability and luminance by compensating for height differences and enhancing light emission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional color conversion layer is used in display devices, then the device structure remains simple, but the display quality and reliability deteriorate due to degradation of the color conversion layer
Solution Approach 1:
The patent divides the protective structure into multiple functional layers: a barrier layer (silicon oxide) for chemical stability, a low refractive index layer for light recycling, and a capping layer for mechanical protection. This segmentation allows each layer to address specific degradation mechanisms independently, improving overall reliability without requiring a single complex solution.
Solution Approach 2:
The patent employs a composite multi-layer structure combining different materials with complementary properties: silicon oxide for barrier functionality, low refractive index materials for optical enhancement, and protective capping materials. This composite approach enables simultaneous achievement of chemical stability, optical performance, and mechanical durability.
2Reliability
If the color conversion layer is made more robust to prevent degradation, then reliability improves, but manufacturing complexity and process difficulty increase
Solution Approach 1:
The barrier layer is formed prior to the color conversion layer deposition, creating a pre-established protective environment. This preliminary action prevents contamination and degradation during subsequent manufacturing steps, ensuring color conversion layer stability without requiring complex in-situ protection mechanisms.
Solution Approach 2:
The patent utilizes thermal energy (heat treatment) to cure the polysilazane and form the silicon oxide barrier layer. This parameter-based approach (temperature control) enables reliable barrier layer formation through a well-established thermal processing technique, maintaining ease of manufacture while achieving superior reliability.
3Reliability
If a barrier layer is added to protect the color conversion layer, then reliability improves, but light emission efficiency may worsen due to additional layer interference
Solution Approach 1:
The low refractive index layer acts as an optical intermediary between the high refractive index silicon oxide barrier layer and the air above. This intermediary layer with intermediate refractive index reduces optical impedance mismatch, enabling efficient light extraction while maintaining the barrier layer's protective function. The barrier layer thus becomes transparent to the emitted light.
4Reliability
If multiple layers are added to stabilize the color conversion layer, then reliability and luminance improve, but device complexity increases
Solution Approach 1:
The silicon oxide barrier layer serves multiple functions simultaneously: it provides chemical stability to prevent color conversion layer degradation, acts as an adhesion promoter for subsequent layers, and functions as part of the optical management system. This multi-functionality reduces the need for separate dedicated layers, managing complexity while improving reliability.
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 proposed structure improves the reliability and display quality by stabilizing the color conversion layer, preventing degradation, and increasing luminance through efficient light recycling and adhesion, thereby enhancing the overall performance of the display device.
Implementation Method 1
The barrier layer may include silicon oxide (SiOx) having cured polysilazane
Implementation Method 2
a low refractive layer disposed on the barrier layer... The low refractive layer may compensate for a height difference between the bank and the color conversion layer
Implementation Method 3
the color conversion layer including color conversion particles
Data Source
AI summary
A display device may include a substrate including a display area and a non-display area; and a plurality of pixels disposed in the display area, the plurality of pixels each including an emission area and a non-emission area. Each of the plurality of pixels may include at least one light emitting element in the emission area; a first pixel electrode and a second pixel electrode electrically connected to the at least one light emitting element; a bank including a first opening corresponding to the emission area; a color conversion layer disposed in the emission area to correspond to the at least one light emitting element; a barrier layer disposed on the bank and the color conversion layer; and a low refractive layer disposed on the barrier layer. The barrier layer may include silicon oxide (SiOx) having cured polysilazane.