Cover Window Edge Structure for Impact-Resistant Display Panels

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Existing display devices face challenges in enhancing impact resistance and surface quality of the cover window, particularly at the edge portion, while minimizing defects in the polarizer and light blocking portions due to environmental factors.

Innovation Solution

The display device design includes a cover window with a central portion thicker than the edge portion, a chamfered edge, and a light blocking film attached to the rear surface of the edge portion, with an adhesive layer between the light blocking film and polarizer, ensuring the sum of their thicknesses equals the central portion's thickness.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Length of moving object

If the cover window is made thinner to meet design requirements, then the display panel can be thinner, but the impact resistance of the edge portion deteriorates

Engineering Contradiction:

Improvethickness of display panelVSAvoidimpact resistance of edge portion

Core Design Contradiction:

Length of moving objectVSStrength

Solution Approach 1:

The cover window is designed with different thicknesses in different regions: the central portion has a first thickness while the edge portion has a second thickness greater than the first. This local quality differentiation allows the edge portion to provide enhanced impact resistance while the central portion remains thin for overall display panel thinness.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

A light blocking film is attached to the rear surface of the edge portion before the product is put into service. This film acts as a cushioning layer that absorbs and distributes impact forces, providing beforehand protection against impacts that would otherwise damage the thin edge portion.

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

2Strength

If adhesive is applied extensively to bond the light blocking film, then bonding strength improves, but defects in the polarizer and light blocking portions increase

Engineering Contradiction:

Improvebonding strength of light blocking filmVSAvoiddefect rate in polarizer and light blocking portions

Core Design Contradiction:

StrengthVSReliability

Solution Approach 1:

The adhesive layer is applied selectively only in regions where the light blocking film and polarizer overlap each other, rather than uniformly across the entire surface. This localized adhesive application provides sufficient bonding strength at the interface while minimizing the total amount of adhesive that could cause defects.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

Instead of applying adhesive over the entire surface area, the invention uses partial action by limiting adhesive application to only the overlapping regions between the light blocking film and polarizer. This reduces the risk of adhesive-related defects while maintaining adequate bonding where it is most needed.

Inventive Principle:

Principle #16Partial or excessive action

Data Source

PatentUS20250386710A1Display device and manufacturing method of display device

Publication Date: 2025.12.18 SAMSUNG DISPLAY CO LTD

AI summary

A display device is disclosed. The display device may include a display panel including a plurality of pixels, a polarizer on the display panel, a cover window on the polarizer, a light blocking film on a rear surface of the cover window, and an adhesive layer between the light blocking film and the polarizer, wherein the adhesive layer is only between the light blocking film and the polarizer that overlap each other.