Optical Path Control Member Sealing Layout to Prevent Leakage and Moire

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Existing switchable light blocking films suffer from issues such as dispersion liquid leakage, impurity penetration, and moire phenomenon when integrated with display panels, leading to reduced visibility and reliability.

Innovation Solution

An optical path control member with cutting portions and sealing portions on the second substrate to contain the optical conversion material, along with inclined accommodating portions to prevent leakage and impurities, and minimize bezel regions for improved reliability and visibility.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the dispersion liquid is filled inside the accommodating portions to enable viewing angle control, then the light blocking function is achieved, but the dispersion liquid leaks out and impurities penetrate in, deteriorating driving characteristics and reliability

Engineering Contradiction:

Improvedriving characteristics and reliabilityVSAvoiddispersion liquid leakage

Core Design Contradiction:

ReliabilityVSLoss of substance

Solution Approach 1:

The accommodating portions are divided into multiple sealed regions by cutting portions that extend from the front surface to the rear surface of the substrate. These cutting portions create isolated compartments that prevent dispersion liquid from leaking between regions while maintaining the light blocking function in each compartment.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The cutting portions and sealing structures are formed in advance during the substrate manufacturing process, before the dispersion liquid is filled. This preliminary creation of sealed compartments ensures that the dispersion liquid remains contained throughout the product lifecycle, preventing both leakage and impurity penetration.

Inventive Principle:

Principle #10Preliminary action

2Area of stationary object

If the pattern of the switchable light blocking film overlaps with the pattern of the display panel, then the display device is compact, but a moire phenomenon occurs, deteriorating visibility

Engineering Contradiction:

Improvebezel region sizeVSAvoidmoire phenomenon

Core Design Contradiction:

Area of stationary objectVSObject-affected harmful factors

Solution Approach 1:

The cutting portions are strategically positioned at the edges and corners of the substrate, extracting the pattern overlap issue from the active display area. By concentrating the structural features at the periphery rather than distributing them across the entire surface, the patent eliminates moire phenomena in the visible display region while maintaining compact bezel dimensions.

Inventive Principle:

Principle #2Taking out (Extraction)

3Reliability

If the cutting portions pass through the entire substrate to seal the accommodating portions, then the sealing effect is improved, but the bezel regions increase in size

Engineering Contradiction:

Improvesealing effectVSAvoidbezel region size

Core Design Contradiction:

ReliabilityVSArea of stationary object

Solution Approach 1:

The cutting portions are concentrated at specific locations (edges and corners) rather than being distributed uniformly across the entire substrate. This localized approach provides effective sealing where most needed while minimizing the impact on bezel region size in the active display area, achieving a balance between sealing effectiveness and display area maximization.

Inventive Principle:

Principle #3Local quality

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 solution effectively inhibits dispersion liquid leakage and impurity penetration, reduces bezel size, and prevents moire phenomena, enhancing the reliability and visibility of the optical path control member when integrated with display devices.

Implementation Method 1

an optical conversion unit disposed between the first electrode and the second electrode

Methodology Applied

Scientific EffectLight conversion:

Implementation Method 2

a dispersion liquid for dispersing the particles and by dispersing and aggregating the particles

Methodology Applied

Scientific EffectDispersion: Dispersion (of waves)

Implementation Method 3

filling the inside of the accommodating portion with particles that may move when a voltage is applied and a dispersion liquid for dispersing the particles

Methodology Applied

Scientific EffectElectrophoresis: Electrophoresis

Data Source

PatentUS12523859B2Optical path control member and display device including same

Publication Date: 2026.01.13 LG INNOTEK CO LTD

AI summary

An optical path control member according an embodiment comprises: a first substrate for which a first direction and a second direction are defined; a first electrode arranged on the first substrate; a second substrate which is arranged on the first substrate, and for which the first direction and the second direction are defined; a second electrode arranged under the second substrate; and an optical conversion unit arranged between the first electrode and the second electrode, wherein: the second substrate and the second electrode include a cutting portion that passes through the second substrate and the second electrode; the cutting portion comprises a 1-1 cutting portion and a 1-2 cutting portion that are arranged in the second direction while facing each other, and a 2-1 cutting portion and a 2-2 cutting portion that are arranged in the first direction while facing each other; and a first sealing portion is arranged on the 1-1 cutting portion and the 1-2 cutting portion, and a second sealing portion is arranged inside the 2-1 cutting portion and the 2-2 cutting portion.