Protection Layer for Display Wavelength Conversion Integrity
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Solution Overview
Problem
Display devices face challenges in maintaining the integrity of wavelength conversion layers due to damage from light energy and thermal energy emitted by light emitting elements, leading to reduced display quality.
Innovation Solution
A protection layer is strategically placed between the light emitting elements and the wavelength conversion layers to mitigate damage from light and thermal energy, and a method is developed to efficiently form this protection layer using an inkjet process that reduces fabrication time by spatially connecting emission areas and spraying ink only to specific areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a protection layer is disposed between the light emitting element and the wavelength conversion layer, then the wavelength conversion layer is protected from damage by light energy and thermal energy, but the device complexity increases due to the additional layer
Solution Approach 1:
A protection layer is introduced as an intermediary component between the light emitting element and the wavelength conversion layer. This protection layer specifically blocks light energy and thermal energy from reaching the wavelength conversion layer, preventing damage and improving reliability without fundamentally changing the overall device architecture
2Manufacturing precision
If the inkjet process is applied to form the protection layer, then the manufacturing precision is improved, but the productivity decreases due to the additional process time
Solution Approach 1:
The formation of the protection layer is merged with the existing inkjet printing process used for forming other layers in the display device. By utilizing the same inkjet printing apparatus and process conditions, the protection layer is formed simultaneously with other structural layers, eliminating the need for separate processing steps and maintaining productivity
3Productivity
If the passage is formed to connect emission areas, then the productivity is improved by reducing inkjet process time, but the manufacturing precision may be affected by the additional pattern formation and removal steps
Solution Approach 1:
Patterns for forming passages are created in advance during the same inkjet printing process used for forming the protection layer. These patterns are pre-positioned in non-emission areas and are removed along with alignment lines in a subsequent single etching step, ensuring precise alignment without requiring additional positioning operations that could compromise manufacturing precision
Data Source
AI summary
A display device includes a pixel including a first sub-pixel configured to emit a first color light and a second sub-pixel configured to emit a second color light that is different from the first color light. The display includes a substrate including an emission area and a non-emission area surrounding the emission area, a bank in the non-emission area on the substrate, a first electrode and a second electrode in each of the first sub-pixel and the second sub-pixel on the substrate, a light emitting element between the first electrode and the second electrode in the emission area, a wavelength conversion layer on the light emitting element in the emission area, and a protection layer on the substrate. The protection layer includes a first area in the emission area and located between the wavelength conversion layer and the light emitting element, and a second area in the non-emission area.