OLED Display Substrate Encapsulation Without Masking

Solution Overview

Problem

The existing thin film encapsulation processes for OLED display devices require the use of a mask during chemical vapor deposition, increasing production costs and complexity due to the need for precise masking to form inorganic encapsulation layers, which is not efficient for the bonding pad areas.

Innovation Solution

A manufacturing method for a display substrate that forms a first inorganic encapsulation layer on the entire surface, followed by an organic encapsulation layer, and a second inorganic encapsulation layer, with the inorganic encapsulation layer in the bonding pad area being removed, allowing for cost-effective formation without the need for masking, and incorporating touch metal layers and capping layers for enhanced protection and functionality.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If a mask is used during chemical vapor deposition to form the inorganic encapsulation layer in a local area, then the encapsulation precision is improved, but the device complexity and production cost increase

Engineering Contradiction:

Improveencapsulation precisionVSAvoidproduction process complexity

Core Design Contradiction:

Manufacturing precisionVSDevice complexity

Solution Approach 1:

The substrate is divided into display area and bonding area, with different encapsulation strategies applied to each region. The display area receives full encapsulation while the bonding area remains exposed, eliminating the need for masking during deposition.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different regions of the substrate are given different encapsulation properties: the display area is fully encapsulated with inorganic and organic layers for protection, while the bonding area is left unencapsulated to allow external connection, achieving local optimization of encapsulation quality.

Inventive Principle:

Principle #3Local quality

2Manufacturing precision

If a mask is used during chemical vapor deposition to form the inorganic encapsulation layer in a local area, then the encapsulation precision is improved, but the production cost increases

Engineering Contradiction:

Improveencapsulation precisionVSAvoidproduction cost

Core Design Contradiction:

Manufacturing precisionVSEase of manufacture

Solution Approach 1:

The substrate is divided into display area and bonding area, with different encapsulation strategies applied to each region. The display area receives full encapsulation while the bonding area remains exposed, eliminating the need for masking during deposition.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different regions of the substrate are given different encapsulation properties: the display area is fully encapsulated with inorganic and organic layers for protection, while the bonding area is left unencapsulated to allow external connection, achieving local optimization of encapsulation quality.

Inventive Principle:

Principle #3Local quality

3Productivity

If the inorganic encapsulation layer is formed on the entire surface, then the productivity is improved, but the bonding pad area becomes inaccessible for external connection

Engineering Contradiction:

Improvemanufacturing efficiencyVSAvoidbonding accessibility

Core Design Contradiction:

ProductivityVSEase of operation

Solution Approach 1:

The substrate is divided into display area and bonding area, with different encapsulation strategies applied to each region. The display area receives full encapsulation while the bonding area remains exposed, eliminating the need for masking during deposition.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different regions of the substrate are given different encapsulation properties: the display area is fully encapsulated with inorganic and organic layers for protection, while the bonding area is left unencapsulated to allow external connection, achieving local optimization of encapsulation quality.

Inventive Principle:

Principle #3Local quality

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 method reduces production costs by eliminating the need for masking during inorganic encapsulation layer formation, while ensuring effective encapsulation and protection of the OLED elements, enhancing the reliability and efficiency of the display substrate manufacturing process.

Implementation Method 1

The inorganic encapsulation layer is formed by chemical vapor deposition in the manufacturing process

Methodology Applied

Scientific EffectChemical vapor deposition: Chemical Vapour Deposition

Data Source

PatentUS11723257B2Organic light emitting diode display substrate, manufacturing method therefor, and organic light emitting diode display device

Publication Date: 2023.08.08 CHENGDU BOE OPTOELECTRONICS TECH CO LTD

AI summary

A manufacturing method for a display substrate, a display substrate and a display device are provided. The display substrate includes a display area and a bonding area at one side of the display area. The bonding area includes an isolation area disposed close to the display area and a bonding pad area disposed at one side of the isolation area far away from the display area. The manufacturing method of the display substrate includes forming a driving structure layer in the display area of a substrate and a bonding structure layer in the bonding area of the substrate, forming a light emitting structure layer on the driving structure layer of the display area, forming an isolation dam on the bonding structure layer of the isolation area, forming an encapsulation structure layer in the display area.