Cover Lens Alignment Marks for Display Panel Bonding

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Solution Overview

Problem

Existing electronic devices face challenges in bonding processes due to tolerances, leading to reduced accuracy and process margin, which affects visual effects and reliability, and limits their application in narrow-frame or curved-edge devices.

Innovation Solution

Incorporation of a cover lens with alignment marks, including a substrate and alignment marks with controlled transmittance, allowing precise alignment and bonding processes, even in devices with complex shapes.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If multiple bonding processes are performed during manufacturing, then different elements, films, and layers can be bonded together, but tolerances occur that reduce accuracy and process margin

Engineering Contradiction:

Improvebonding process capabilityVSAvoidbonding accuracy

Core Design Contradiction:

Ease of manufactureVSManufacturing precision

Solution Approach 1:

Alignment marks are formed on the substrate before the bonding process. These pre-formed marks serve as reference features that enable precise alignment during subsequent bonding operations, compensating for tolerances that occur during manufacturing processes.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

Alignment marks act as intermediary reference features between the substrate and the bonding process. These marks provide a common reference framework that mediates the alignment between different components being bonded, ensuring accuracy despite process tolerances.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Measurement precision

If alignment marks with high transmittance are used, then alignment precision is improved, but visual quality in the active area may be affected

Engineering Contradiction:

Improvealignment precisionVSAvoidvisual quality

Core Design Contradiction:

Measurement precisionVSObject-affected harmful factors

Solution Approach 1:

Alignment marks are positioned in specific locations (such as the peripheral area) rather than uniformly across the entire substrate. This localized placement allows high transmittance marks to be used without affecting the visual quality of the active display area, as the marks are confined to non-critical regions.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

Alignment marks are designed with specific optical properties including controlled transmittance ranges. By adjusting the transmittance characteristics of the alignment marks, they can be optimized for detection during alignment while minimizing their visual impact when the device is in use.

Inventive Principle:

Principle #32Color changes

Data Source

PatentUS20250324841A1Electronic device

Publication Date: 2025.10.16 INNOLUX CORP

AI summary

An electronic device is provided. The electronic device includes a display panel and a cover lens. The display panel has an active area. The cover lens is disposed corresponding to the display panel. The cover lens includes a substrate, a first alignment mark, and a second alignment mark. The first alignment mark is disposed on a surface of the substrate and corresponds to a first position in the active area. The second alignment mark is disposed on the surface of the substrate and corresponds to a second position in the active area. The second position differs from the first position. Wherein, a transmittance of the first alignment mark in a first alignment region is 20% to 99%.