Flexible Display Cover Bonding via Pressurized Gas and Stretching

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Solution Overview

Problem

Current flexible OLED and flexible micro-LED displays face limitations in achieving true three-dimensional curved surfaces due to the constraints of existing molding processes, which are not suitable for the micron-scale transistors and metal circuits in these displays.

Innovation Solution

A method for attaching a display cover using an attaching device that involves fixing the cover to the bottom of an accommodating cavity, sealing the display panel within the cavity, heating the panel, filling the sealed space with pressurized gas, and using a stretching mechanism to bond the display panel and cover together under controlled pressure and temperature.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Shape

If traditional molding processes (injection molding, extrusion, stamping) are used to form three-dimensional curved surfaces, then the curved surface shape can be obtained, but the process cannot be used because the flexible display panel with micron-scale transistors and metal circuits has limited tolerance to molding temperature and pressure

Engineering Contradiction:

Improvethree-dimensional curved surfaceVSAvoiddamage to micron-scale transistors and metal circuits

Core Design Contradiction:

ShapeVSReliability

Solution Approach 1:

The patent changes the physical parameters of the display panel by controlling temperature and pressure during the bonding process. The temperature is maintained below 100°C and pressure is kept under 5kgf/cm², which are parameter adjustments that enable three-dimensional curved surface formation without damaging the sensitive electronic components.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent replaces traditional high-temperature and high-pressure molding processes with a low-temperature, low-pressure bonding process. Instead of using injection molding or extrusion that require extreme conditions, the patent uses controlled thermal and pressure bonding that substitutes the harsh mechanical molding system with a gentler process suitable for flexible displays.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Shape

If the display panel is attached to a protective cover in a curved surface along a linear axis, then a curved shape can be presented, but this is not a true three-dimensional curved surface as the display needs to be stretched at least biaxially to form a spatial three-dimensional curved surface

Engineering Contradiction:

Improvecurved shape along linear axisVSAvoidtrue three-dimensional curved surface

Core Design Contradiction:

ShapeVSManufacturing precision

Solution Approach 1:

The patent transitions from one-dimensional linear axis curvature to two-dimensional biaxial stretching to achieve true three-dimensional curved surfaces. The display panel is stretched in multiple directions simultaneously, adding dimensional complexity that transforms the simple arc shape into a genuine spatial curved surface.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

3Strength

If heating is applied to the display panel during the bonding process, then bonding effectiveness is improved, but the temperature must be controlled below 100°C to avoid damaging the organic light emitting diodes

Engineering Contradiction:

Improvebonding strengthVSAvoidtemperature control below 100°C

Core Design Contradiction:

StrengthVSTemperature

Solution Approach 1:

The patent optimizes the temperature parameter to a specific range (below 100°C) that balances bonding effectiveness with component safety. This parameter adjustment enables sufficient adhesion between the display panel and protective cover while preventing thermal damage to the organic light emitting diodes.

Inventive Principle:

Principle #35Parameter changes

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 approach integrates molding and bonding, avoiding issues like poor fit and wrinkles, and allows for precise control of the bonding process to achieve a true three-dimensional curved surface without damaging the display panel.

Implementation Method 1

heating the sealed space of the sealing mechanism and the display panel at a preset temperature by a heating mechanism fixed in the sealing mechanism

Methodology Applied

Scientific EffectHeating: Heating

Implementation Method 2

filling the sealed space of the sealing mechanism with a pressurized gas, pushing a stretching mechanism movably connected with the sealing mechanism to move to the display panel

Methodology Applied

Scientific EffectGas pressure: Pressure Increase

Implementation Method 3

bonding the display panel and the cover under a pushing force of the stretching mechanism and a pressure of the pressurized gas

Methodology Applied

Scientific EffectPressure bonding: Compression

Data Source

PatentUS20250165031A1Method for attaching display cover and attaching device

Publication Date: 2025.05.22 WUHAN CHINA STAR OPTOELECTRONICS SEMICONDUCTOR DISPLAY TECHNOLOGY CO LTD

AI summary

A method and device for attaching a display cover are provided. In an attaching method, a display panel is fixed to a sealing mechanism, and a cover is fixed to a bottom of an accommodating cavity of a housing. By filling a sealed space of the sealing mechanism with a pressurized gas, while a stretching mechanism pushes the display panel to deform, the display panel and the cover are bonded together under an action of the stretching mechanism and the pressurized gas. This alleviates an issue of a limited molding process in realization of three-dimensional curved surface of current flexible OLED and flexible micro-LED displays.