Display Edge Light Blocking with Gradient Curing Against AR Layer Cracks
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Solution Overview
Problem
Display devices experience light leakage to edge portions, leading to potential damage due to stress, 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 by managing stress through controlled shrinkage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a light blocking member is added to prevent light leakage, then light leakage is reduced, but stress concentration occurs causing cracks in the anti-reflection layer
Solution Approach 1:
The light blocking member is designed with non-uniform curing rates across different regions. The first region (outer side) has a higher curing rate (85-100%) providing strong structural support and light blocking, while the second region (inner side) has a lower curing rate (25-55%) providing flexibility to accommodate stress without cracking the anti-reflection layer. This spatial variation in material properties resolves the contradiction between light blocking effectiveness and stress management.
Solution Approach 2:
The curing rate parameter of the light blocking member is deliberately varied across different regions. By controlling the curing rate to be higher at the outer region and lower at the inner region, the material transitions from a rigid light-blocking structure to a more compliant stress-absorbing interface, preventing crack propagation into the anti-reflection layer while maintaining light blocking functionality.
2Strength
If the light blocking member is fully cured for strong bonding, then bonding strength increases, but stress-induced cracks occur in the anti-reflection layer
Solution Approach 1:
Different regions of the light blocking member exhibit different curing states: the first region (outer side) achieves high curing (85-100%) for strong bonding to the cover window and display panel, while the second region (inner side) maintains lower curing (25-55%) for stress compliance. This localized differentiation allows the structure to simultaneously achieve strong bonding where needed and stress absorption where critical.
Solution Approach 2:
The partially cured second region acts as a pre-designed stress buffer zone that absorbs thermal and mechanical stresses before they can propagate to the anti-reflection layer. This beforehand cushioning through controlled under-curing prevents reliability issues while maintaining overall structural integrity.
3Strength
If the light blocking member has high curing rate for structural integrity, then structural strength improves, but stress management capability decreases
Solution Approach 1:
The light blocking member implements spatially varying curing rates: the outer first region (85-100% curing) provides structural integrity and rigid support, while the inner second region (25-55% curing) provides stress management flexibility. This gradient structure allows simultaneous optimization of both structural strength and stress accommodation capabilities.
Solution Approach 2:
The light blocking member effectively functions as a composite structure with two distinct material states within a single component. The highly cured outer region behaves like a rigid structural material, while the partially cured inner region behaves like a compliant damping material, together providing both structural integrity and stress management in one integrated element.
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 under stress conditions.
Implementation Method 1
the light blocking member includes a first region and a second region having different curing rates
Data Source
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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.