Cover Window Metal Layer Enclosure for Display Reflection Control

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Solution Overview

Problem

Typical cover windows for display devices often exhibit cosmetic defects due to exposed metal layer patterns at the boundaries between light-transmitting and light-blocking areas, which can lead to unwanted reflections and aesthetic issues.

Innovation Solution

A cover window design where a metal layer pattern is enclosed by forming a first light-blocking layer pattern on the metal layer's surface, followed by a second light-blocking layer that covers the inner side surfaces of both the metal and first light-blocking layers, ensuring the metal layer is completely hidden and preventing exposure.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If a metal layer pattern is used in the cover window, then the structural integrity and conductivity are improved, but cosmetic defects and unwanted reflections occur at the boundaries between light-transmitting and light-blocking areas

Engineering Contradiction:

Improvestructural integrityVSAvoidcosmetic defects and reflections

Core Design Contradiction:

StrengthVSObject-affected harmful factors

Solution Approach 1:

The harmful metal layer pattern is extracted and removed from the boundary regions where it causes cosmetic defects and reflections. The patent specifically removes the metal layer from areas adjacent to the light-transmitting area, retaining it only in regions where it provides structural benefit without causing visual harm.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The metal layer pattern is applied non-uniformly across the cover window substrate. It is present in certain regions for structural support and conductivity, but deliberately absent from boundary regions near the light-transmitting area to prevent cosmetic defects, creating local variations in material properties.

Inventive Principle:

Principle #3Local quality

2Object-affected harmful factors

If the metal layer pattern is completely removed to eliminate cosmetic defects, then reflections and aesthetic issues are reduced, but structural integrity and conductivity are compromised

Engineering Contradiction:

Improvecosmetic defects and reflectionsVSAvoidstructural integrity

Core Design Contradiction:

Object-affected harmful factorsVSStrength

Solution Approach 1:

The metal layer pattern is segmented into distinct regions: retained in areas where structural support is needed, and removed from areas where cosmetic appearance is critical. This segmentation allows the design to simultaneously achieve both structural integrity and aesthetic quality.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different regions of the cover window have different metal layer configurations - full metal coverage in structural zones, partial or no coverage in cosmetic zones - optimizing both strength and appearance locally rather than applying a uniform solution.

Inventive Principle:

Principle #3Local quality

3Object-affected harmful factors

If multiple light-blocking layer patterns are added to fully enclose the metal layer pattern, then cosmetic defects are eliminated, but device complexity and manufacturing steps increase

Engineering Contradiction:

Improvecosmetic defectsVSAvoidstructure complexity

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

Instead of adding multiple light-blocking layers to enclose the metal pattern, the solution extracts and removes the metal layer pattern from problematic boundary regions, simplifying the overall structure while eliminating cosmetic defects.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

Rather than adding layers to cover the metal pattern (additive approach), the invention removes the metal pattern from visible areas (subtractive approach), achieving the same cosmetic effect with reduced structural complexity.

Inventive Principle:

Principle #13The other way round (Inversion)

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 design eliminates cosmetic defects by ensuring the metal layer is fully enclosed, reducing reflections and enhancing the aesthetic appeal of the display device by maintaining a uniform appearance.

Implementation Method 1

a metal layer pattern which is formed on a surface of a periphery of the light-transmitting substrate

Methodology Applied

Scientific EffectPhysical vapor deposition: Physical Vapour Deposition

Implementation Method 2

a light-blocking area which surrounds the light-transmitting area

Methodology Applied

Scientific EffectLight absorption: Absorption (EM radiation)

Data Source

PatentUS9832890B2Cover window, method of manufacturing the cover window, and display device including the cover window

Publication Date: 2017.11.28 SAMSUNG DISPLAY CO LTD

AI summary

A cover window includes a light-transmitting substrate, a metal layer pattern on the light-transmitting substrate, the metal layer pattern being in a peripheral region of the light-transmitting substrate, a first light-blocking layer pattern on the metal layer pattern, a second light-blocking layer pattern extending from the light-transmitting substrate to the first light-blocking layer pattern, the second light-blocking layer pattern covering inner side surfaces of the metal layer pattern and the first light-blocking layer pattern, and a light-transmitting area on the light-transmitting substrate, the light-transmitting area being surrounded by the second light-blocking layer pattern.