Bent Display Substrate Alignment Mark Placement

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Solution Overview

Problem

Existing display devices face challenges in accurately perceiving and minimizing distortions of alignment marks during the bonding process, particularly when the display panel is bent, which can lead to inaccurate alignment and increased complexity in manufacturing.

Innovation Solution

The display device features a substrate with bent side members and alignment marks strategically placed at corners to facilitate perception and minimize distortions, allowing for precise alignment and bonding between the display panel and the cover window.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If alignment marks are placed on the display panel for bonding alignment, then alignment between cover window and display panel can be achieved, but the alignment marks become distorted when the display panel is bent

Engineering Contradiction:

Improvealignment mark perception accuracyVSAvoidalignment mark distortion

Core Design Contradiction:

Measurement precisionVSManufacturing precision

Solution Approach 1:

The alignment mark is extracted from the bent display panel area and placed on the cover window instead, which remains flat and does not undergo distortion during the bending process

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

Instead of placing the alignment mark on the display panel that gets bent, the alignment mark is invertedly placed on the cover window that remains unbent, reversing the conventional approach

Inventive Principle:

Principle #13The other way round (Inversion)

2Adaptability or versatility

If the display panel is bent to form side members for diverse device designs, then design versatility is improved, but alignment mark perception becomes difficult and distortion increases

Engineering Contradiction:

Improvedevice design diversityVSAvoidalignment mark perception difficulty

Core Design Contradiction:

Adaptability or versatilityVSDifficulty of detecting and measuring

Solution Approach 1:

The alignment mark function is extracted from the bent display panel structure and relocated to the flat cover window, allowing the display panel to be freely bent for diverse designs without compromising alignment functionality

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The alignment reference is moved from the two-dimensional bent surface of the display panel to the flat surface of the cover window, creating a stable reference plane that maintains perceptibility regardless of the display panel's three-dimensional configuration

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

Data Source

PatentUS12133424B2Display device and method of manufacturing the display device

Publication Date: 2024.10.29 SAMSUNG DISPLAY CO LTD

AI summary

A display device includes a substrate including a front member, first and second side members extended from the front member, and a first corner disposed between the first and second side members, the first side member being bent along a first bending line in a first direction, the second side member being bent along a second bending line in a second direction crossing the first direction, and an alignment mark disposed at the first corner of the substrate.