OLED Encapsulation Substrate Warping via Segmented Reflecting Member

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Solution Overview

Problem

Conventional organic light emitting diode (OLED) displays face issues with warping of the encapsulation substrate due to differences in thermal expansion coefficients between metal reflecting members and glass substrates, leading to distortion and deterioration of the reflecting function, especially after heat treatment processes.

Innovation Solution

The implementation of an auxiliary opening in the main reflecting member, which divides it into sub-reflecting members, and an auxiliary reflecting member positioned to correspond with these openings, helps prevent warping and maintains the reflecting function by minimizing thermal expansion-related issues and allowing for improved alignment and functionality.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Illumination intensity

If a metal reflecting member is used on the encapsulation substrate, then the reflecting function is improved, but the encapsulation substrate warps due to thermal expansion differences

Engineering Contradiction:

Improvereflecting functionVSAvoidsubstrate warping

Core Design Contradiction:

Illumination intensityVSStability of the object's composition

Solution Approach 1:

The main reflecting member is divided into multiple sub-reflecting members by introducing auxiliary openings. This segmentation reduces the continuous metal area, thereby reducing thermal expansion stress and preventing substrate warping while maintaining the reflecting function through the distributed sub-reflecting members.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Auxiliary reflecting members are strategically positioned at specific locations (such as corners or edges) to provide localized reflection support. This allows the main reflecting function to be maintained through segmentation while auxiliary members compensate for any potential light loss and provide structural stability.

Inventive Principle:

Principle #3Local quality

2Stability of the object's composition

If the main reflecting member is divided into sub-reflecting members, then warping is prevented, but the reflecting function may be compromised

Engineering Contradiction:

Improvesubstrate stabilityVSAvoidreflecting function

Core Design Contradiction:

Stability of the object's compositionVSIllumination intensity

Solution Approach 1:

Auxiliary reflecting members are positioned at strategic locations to provide localized reflection support where needed. This ensures that even though the main reflecting member is segmented, the overall reflecting function is maintained through complementary localized reflection from the auxiliary members.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The main reflecting member and auxiliary reflecting members work together as an integrated reflection system. The auxiliary members supplement the segmented main member, ensuring that the combined reflection capability maintains or enhances the overall reflecting function while the segmented structure prevents warping.

Inventive Principle:

Principle #5Merging (Combining)

3Stability of the object's composition

If auxiliary openings are introduced to divide the reflecting member, then thermal expansion issues are reduced, but the structural complexity increases

Engineering Contradiction:

Improvethermal expansion compatibilityVSAvoidreflecting member structure

Core Design Contradiction:

Stability of the object's compositionVSDevice complexity

Solution Approach 1:

The reflecting member is segmented into sub-reflecting members through auxiliary openings, which reduces thermal expansion stress. While this increases structural complexity, the segmentation pattern can be designed to follow simple geometric rules (such as grid patterns or regular intervals) to minimize manufacturing complexity.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Auxiliary reflecting members are added only at specific critical locations rather than uniformly across the entire structure. This localized approach provides the necessary structural and optical compensation while minimizing the overall increase in device complexity compared to a fully distributed auxiliary system.

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 configuration effectively prevents the encapsulation substrate from warping and maintains the reflecting function's integrity, ensuring efficient light emission and reducing the risk of distortion caused by thermal expansion differences.

Implementation Method 1

an encapsulation substrate encapsulating the display substrate and including a main reflecting member to perform a mirror function while the OLED does not emit light

Methodology Applied

Scientific EffectReflection: Reflection

Implementation Method 2

an auxiliary reflecting member which is formed at a position corresponding to the auxiliary opening

Methodology Applied

Scientific EffectReflection: Reflection

Data Source

PatentUS9466815B2Organic light emitting diode display

Publication Date: 2016.10.11 SAMSUNG DISPLAY CO LTD

AI summary

An organic light emitting diode display includes a display substrate including a first substrate and a plurality of pixel light emitting units on the first substrate, and an encapsulation substrate including a second substrate facing the display substrate, and a main reflecting member on the second substrate, the main reflecting member including a light emitting opening at a position corresponding to at least one of the pixel light emitting units, and an auxiliary opening dividing the main reflecting member into a plurality of sub-reflecting members.