Stretchable Display Light-Transmitting Unit for Lattice Pattern Suppression

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Solution Overview

Problem

Stretchable display devices experience a reduction in image quality and visibility of lattice patterns when stretched due to non-uniform stretching, leading to increased distance between display elements and reduced emission zone density.

Innovation Solution

A stretchable display device design featuring a lower flexible substrate, island substrates with display elements, and a light-transmitting unit that includes partition walls and sub-light-transmitting layers to guide and transmit light between island substrates, preventing color mixture and maintaining luminance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If the stretchable display device is stretched, then the flexibility and shape adaptability are improved, but the distance between display elements increases and emission zone density decreases, leading to image quality deterioration

Engineering Contradiction:

Improveshape adaptabilityVSAvoidemission zone density

Core Design Contradiction:

Adaptability or versatilityVSManufacturing precision

Solution Approach 1:

The display device is divided into multiple rigid regions containing display elements and flexible regions that can be stretched. This segmentation allows different parts of the device to have different mechanical properties, enabling the rigid regions to maintain their structural integrity and emission zone density while the flexible regions accommodate stretching and shape changes.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different regions of the display device are assigned different functional qualities: rigid regions are designed to maintain structural stability and high emission zone density for optimal image quality, while flexible regions are designed to accommodate stretching and deformation. This local differentiation resolves the contradiction by allowing the device to be stretched without compromising the emission zone density in the rigid regions.

Inventive Principle:

Principle #3Local quality

2Adaptability or versatility

If the flexible region is stretched, then the flexibility is improved, but the distance between rigid regions increases, causing larger flexible region area and reduced emission zone density

Engineering Contradiction:

ImproveflexibilityVSAvoidemission zone area

Core Design Contradiction:

Adaptability or versatilityVSArea of stationary object

Solution Approach 1:

The display area is segmented into multiple rigid regions separated by flexible regions. When the device is stretched, the flexible regions expand while the rigid regions maintain their internal structure and emission zone density. This segmentation prevents the uniform expansion that would otherwise reduce emission zone density across the entire display area.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The device structure transitions from a uniform two-dimensional display to a three-dimensional configuration with rigid regions elevated on the substrate. This dimensional change allows the rigid regions to maintain their relative positions and emission zone density even when the flexible substrate is stretched in the plane.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

3Adaptability or versatility

If display elements are spaced further apart during stretching, then the flexibility is improved, but the image quality deteriorates and lattice patterns become more visible

Engineering Contradiction:

ImprovestretchabilityVSAvoidlattice pattern visibility

Core Design Contradiction:

Adaptability or versatilityVSObject-affected harmful factors

Solution Approach 1:

The display is segmented into discrete rigid regions that contain display elements. The flexible regions between these rigid segments can be stretched without affecting the internal structure of the rigid regions. This segmentation prevents the formation of visible lattice patterns by maintaining consistent spacing and structural integrity within each rigid region while allowing overall device stretchability.

Inventive Principle:

Principle #1Segmentation

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 enhances image quality by ensuring uniform luminance and preventing lattice patterns when the device is stretched, improving color purity and preventing color mixture through strategic light transmission and emission zone management.

Implementation Method 1

a light-transmitting unit disposed on the island substrates and the lower substrate and transmitting light from the plurality of display elements

Methodology Applied

Scientific EffectLight transmission: Light

Implementation Method 2

guiding light emitted from a plurality of display elements to regions between a plurality of island substrates

Methodology Applied

Scientific EffectTotal internal reflection: Total Internal Reflection

Data Source

PatentUS10928859B2Stretchable display device

Publication Date: 2021.02.23 LG DISPLAY CO LTD

AI summary

A display device comprises a plurality of island substrates spaced apart from one another and having a plurality of display elements disposed thereon; a lower substrate supporting the plurality of island substrates and the lower substrate being more flexible than the plurality of island substrates; a plurality of connection lines electrically connecting between the island substrates; and a light-transmitting unit disposed on the island substrates and the lower substrate and transmitting light from the plurality of display elements.