Inclined Laser Reflector for OLED Packaging

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Solution Overview

Problem

Rigid organic electroluminescent display panels face issues with laser burns and temperature gradients due to uneven laser irradiation, affecting pixel quality and mechanical stability during the packaging process.

Innovation Solution

Incorporating a laser reflector with a top surface inclined towards the packaging adhesive between the pixel array and the adhesive, which reflects the edge portion of the laser to prevent burns and reduce temperature gradients, using materials like MoO3, SiNx, or SiO2, and forming the reflector through processes such as photolithography or coating.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If laser is used to irradiate the glass adhesive in the package area, then the packaging process is completed, but the inner corner receives excessive laser energy causing pixel burns and abnormal light emission

Engineering Contradiction:

Improvepackaging process efficiencyVSAvoidlaser burn damage to pixels

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The patent introduces a laser reflector that converts the harmful excessive laser energy at the inner corner into a beneficial effect by reflecting the laser beam away from the pixel area. The reflector is strategically positioned to intercept and redirect the laser path, transforming what would be damaging concentrated energy into a controlled reflection that protects the pixels while still allowing the packaging process to complete successfully.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Solution Approach 2:

The laser reflector serves as an intermediary element between the laser source and the pixel array. This intermediate component modifies the laser energy distribution by reflecting it, preventing direct harmful interaction between the laser and the pixels at the inner corner, while still enabling the laser to perform its packaging function on the glass adhesive.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Productivity

If large amount of laser energy is used to process the package area, then packaging is achieved, but temperature gradient in the glass adhesive increases causing mechanical stress

Engineering Contradiction:

Improvepackaging process efficiencyVSAvoidtemperature gradient in glass adhesive

Core Design Contradiction:

ProductivityVSTemperature

Solution Approach 1:

The laser reflector converts the excessive laser energy that would create harmful temperature gradients into a beneficial reflection pattern. By redirecting the laser beam, the system maintains sufficient energy for effective packaging while distributing the thermal load more evenly, preventing localized overheating and reducing temperature gradients in the glass adhesive.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

3Strength

If laser energy is concentrated at the inner corner for effective packaging, then packaging adhesion is improved, but pixel quality deteriorates due to burns and abnormal emission

Engineering Contradiction:

Improvepackaging adhesion strengthVSAvoidpixel quality and light emission uniformity

Core Design Contradiction:

StrengthVSManufacturing precision

Solution Approach 1:

The laser reflector acts as an intermediary that decouples the packaging process from the pixel area. It allows the laser to maintain high energy concentration for effective glass adhesive packaging while simultaneously protecting the pixels from direct exposure, thus preserving pixel quality and preventing manufacturing defects.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent segments the laser energy distribution by using the reflector to create distinct zones: one where energy is concentrated for packaging (glass adhesive area) and another where energy is redirected away from (pixel area). This spatial segmentation of energy distribution allows simultaneous achievement of strong packaging adhesion and high pixel quality.

Inventive Principle:

Principle #1Segmentation

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 solution effectively reduces energy loss, improves packaging performance, and enhances the mechanical quality of the display panel by preventing laser burns and minimizing stress on the glass adhesive, resulting in improved display quality and reliability.

Implementation Method 1

a laser reflector located between the pixel array and the packaging adhesive. The laser reflector includes a top surface inclined toward the packaging adhesive

Methodology Applied

Scientific EffectLaser reflection: Reflection

Data Source

PatentUS10651248B2Organic electroluminescent display panel and display device

Publication Date: 2020.05.12 ORDOS YUANSHENG OPTOELECTRONICS

AI summary

An organic electroluminescent display panel and a display device is disclosed. The organic electroluminescent display panel includes: a pixel array; a packaging adhesive surrounding the pixel array; and a laser reflector located between the pixel array and the packaging adhesive. The laser reflector includes a top surface inclined toward the packaging adhesive which reflects the edge portion of the laser to the packaging adhesive.