Display Substrate Hydrogen Barrier Layout for OLED Sensor Reliability
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Solution Overview
Problem
Existing OLED display technologies face issues with hydrogen penetration during the preparation process, which affects the electrical properties of transistors due to hydrogen interacting with the oxide active layer, leading to high current states and impaired electrical performance.
Innovation Solution
A display substrate design incorporating a top emission structure with inorganic hydrogen barrier layers on the optical sensing elements to block hydrogen penetration, ensuring normal transistor operation and improving yield and display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If optical sensing elements are prepared using conventional methods without hydrogen barrier layers, then the preparation process is simple, but hydrogen penetrates into the oxide active layer of transistors causing high current states and electrical performance degradation
Solution Approach 1:
An inorganic hydrogen barrier layer is introduced as an intermediary between the optical sensing element and the transistor oxide active layer. This barrier layer specifically blocks hydrogen penetration while allowing the optical sensing function to operate normally, thereby protecting the transistor from hydrogen-induced electrical performance degradation without fundamentally changing the optical sensing mechanism.
Solution Approach 2:
The patent employs composite material structure by combining inorganic barrier layer materials with the existing OLED display substrate and optical sensing element materials. This composite approach creates a multi-functional structure that simultaneously provides hydrogen blocking capability, optical sensing functionality, and structural integrity, resolving the contradiction between reliability improvement and device complexity.
2Reliability
If inorganic hydrogen barrier layers are added to block hydrogen penetration, then transistor electrical performance is maintained, but the device structure and manufacturing process become more complex
Solution Approach 1:
The inorganic hydrogen barrier layer is formed preliminarily during the manufacturing process, specifically after forming the optical sensing element and before completing the transistor fabrication. This preliminary action prevents hydrogen penetration from occurring in the first place, maintaining transistor electrical performance while integrating the barrier function into the existing manufacturing workflow with minimal additional steps.
3Adaptability or versatility
If the optical sensing element is positioned to overlap with the light emitting element for detection, then light emission detection is enabled, but hydrogen penetration risk to the transistor increases
Solution Approach 1:
The inorganic hydrogen barrier layer serves as a protective intermediary positioned between the optical sensing element and the transistor oxide active layer. This barrier allows the optical sensing element to maintain its overlapping position with the light emitting element for effective light detection, while simultaneously blocking hydrogen penetration pathways to the transistor, thus resolving the contradiction between sensing capability and hydrogen protection.
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 inorganic hydrogen barrier layers effectively prevent hydrogen ingress, maintaining transistor functionality and enhancing the display substrate's performance and efficiency.
Implementation Method 1
at least one inorganic hydrogen barrier layer is arranged on a side of the optical sensing element close to the substrate
Implementation Method 2
an optical sensing element and a light emitting detecting circuit connected to the optical sensing element
Data Source
AI summary
Provided is a display substrate including a substrate and a plurality of light emitting units and a plurality of light detection units located on the substrate, At least one light emitting unit includes a light emitting element and a pixel circuit connected to the light emitting element, and at least one light detection unit includes an optical sensing element and a light emitting detecting circuit connected to the optical sensing element. At least one inorganic hydrogen barrier layer is arranged on one side of the optical sensing element close to the substrate. The light emitting element has a first light emitting region and a second light emitting region, the first light emitting region of the light emitting element emits light from a side away from the substrate, and the second light emitting region of the light emitting element emits light from a side close to the substrate.