Display Edge Light Blocking with Differential Curing for Crack Prevention

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Solution Overview

Problem

Display devices suffer from light leakage to edge portions, which can lead to stress-related damage, and existing solutions do not effectively address this issue.

Innovation Solution

A display device design incorporating a light blocking member with regions of varying curing rates, including a first region with high curing, a second region with lower curing, and optionally a third region with even lower curing, to prevent cracks in anti-reflection layers due to shrinkage.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-generated harmful factors

If a light blocking member is applied to block light leakage at edge portions, then light leakage is reduced, but stress concentration occurs causing cracks in the anti-reflection layer

Engineering Contradiction:

Improvelight leakageVSAvoidcrack resistance of anti-reflection layer

Core Design Contradiction:

Object-generated harmful factorsVSStrength

Solution Approach 1:

The light blocking member is designed with different curing rates in different regions: a first region with a first curing rate and a second region with a second curing rate that is lower than the first curing rate. This local differentiation allows the light blocking member to have varying mechanical properties across its structure, reducing stress concentration at specific locations while maintaining light blocking effectiveness.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The invention changes the curing rate parameter of the light blocking member across different regions. By controlling the curing process to create regions with different curing rates (e.g., 85%-100% in the first region and 25%-55% in the second region), the material's physical properties are modified locally to balance light blocking performance and stress management.

Inventive Principle:

Principle #35Parameter changes

2Strength

If the light blocking member has high curing rate throughout, then structural strength is improved, but stress-induced cracks occur in the anti-reflection layer

Engineering Contradiction:

Improvestructural strength of light blocking memberVSAvoidcrack-free operation

Core Design Contradiction:

StrengthVSReliability

Solution Approach 1:

Different regions of the light blocking member are assigned different curing rates to achieve different local properties. The first region (outer side) has high curing rate (85%-100%) for structural strength, while the second region (inner side) has lower curing rate (25%-55%) for stress relief, creating a gradient structure that balances strength and reliability.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The light blocking member is segmented into multiple regions with distinct curing characteristics. The first region and second region are clearly differentiated in terms of curing rate, allowing each segment to fulfill its specific function: structural support and stress management respectively.

Inventive Principle:

Principle #1Segmentation

3Ease of manufacture

If the light blocking member is made with uniform curing, then manufacturing is simplified, but stress concentration causes damage to display device

Engineering Contradiction:

Improvemanufacturing simplicityVSAvoidstress-related damage

Core Design Contradiction:

Ease of manufactureVSObject-affected harmful factors

Solution Approach 1:

The manufacturing process is designed to create local quality variations in the light blocking member through controlled curing. By applying UV irradiation in a controlled manner, different regions achieve different curing rates, with the first region curing more than the second region, thereby preventing stress-related damage while maintaining manufacturing feasibility.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The curing process is designed to create the desired curing rate distribution before final assembly. By pre-establishing the differential curing structure in the light blocking member, subsequent assembly and operation proceed without stress-related issues, preventing problems before they occur.

Inventive Principle:

Principle #10Preliminary action

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

The design effectively reduces light leakage and prevents cracks in anti-reflection layers, enhancing the durability and reliability of display devices.

Implementation Method 1

a light blocking member between the cover window and the display panel and on a side surface of the anti-reflection layer

Methodology Applied

Scientific EffectLight absorption: Absorption (EM radiation)

Implementation Method 2

an anti-reflection layer on the display panel and including at least one polarizer layer

Methodology Applied

Scientific EffectOptical interference: Interference

Data Source

PatentUS20260029559A1Display device and electronic device including the same

Publication Date: 2026.01.29 SAMSUNG DISPLAY CO LTD

AI summary

A display device includes: a display panel; an anti-reflection layer on the display panel and including at least one polarizer layer; a cover window on the anti-reflection layer; and a light blocking member between the cover window and the display panel and on a side surface of the anti-reflection layer, wherein the light blocking member includes a first region and a second region having different curing rates, and at least one of the first region or the second region is in contact with the anti-reflection layer.