Phase Compensation Layer for Display Device Light Transmittance

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Solution Overview

Problem

Display devices face challenges in expanding their display area while maintaining image display functionality and preventing performance deterioration of electronic components, especially when components are integrated into the display area.

Innovation Solution

The display device incorporates a substrate with distinct display areas and a peripheral area, featuring a pixel circuit, display elements, connection wiring, conductive layers, and protective layers, along with a phase compensation layer to manage refractive indices and reduce light diffraction, allowing for image display even in areas with electronic components and enhancing light transmittance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If electronic components are integrated into the display area to expand functionality, then device functionality is improved, but image display quality deteriorates due to light diffraction and refractive index variations

Engineering Contradiction:

Improvedevice functionalityVSAvoidimage display quality

Core Design Contradiction:

Adaptability or versatilityVSManufacturing precision

Solution Approach 1:

A phase compensation layer is introduced as an intermediary between the electronic components and the display area. This layer compensates for phase differences caused by refractive index variations, thereby maintaining image display quality while allowing electronic components to be integrated into the display area.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The phase compensation layer is selectively applied only in regions where electronic components are integrated into the display area, rather than uniformly across the entire display. This localized approach compensates for optical disturbances only where needed, preserving image quality in component-integrated zones without affecting other display regions.

Inventive Principle:

Principle #3Local quality

2Reliability

If connection wiring is arranged between substrate and display elements, then electrical connectivity is improved, but light transmittance deteriorates due to wiring obstruction

Engineering Contradiction:

Improveelectrical connectivityVSAvoidlight transmittance

Core Design Contradiction:

ReliabilityVSIllumination intensity

Solution Approach 1:

Connection wiring is routed through the thickness dimension of the display structure rather than across the visual plane. The wiring passes through openings in the substrate or along the edges, utilizing the Z-axis dimension to maintain electrical connectivity while minimizing obstruction of light transmission in the X-Y display plane.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

3Area of stationary object

If display area is expanded to include component regions, then functional area is improved, but performance of electronic components deteriorates due to thermal and electrical interference

Engineering Contradiction:

Improvedisplay areaVSAvoidperformance of electronic components

Core Design Contradiction:

Area of stationary objectVSReliability

Solution Approach 1:

The display area is segmented into distinct functional zones: regions with pixel circuits for image display, regions with electronic components for functionality, and transition zones with phase compensation layers. This segmentation allows each zone to be optimized for its specific function while minimizing interference between adjacent zones.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Phase compensation layers serve as intermediary structures between electronic component regions and display regions. These layers not only correct optical phase differences but also provide thermal management and electrical isolation, thereby protecting electronic component performance while enabling their integration into the expanded display area.

Inventive Principle:

Principle #24Intermediary (Mediator)

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

This configuration enables effective image display in areas with integrated electronic components, reduces performance deterioration, and improves light transmittance by compensating for phase differences caused by refractive index variations, thus enhancing the functionality and efficiency of the display device.

Implementation Method 1

a phase compensation layer arranged below the connection wiring, wherein a refractive index of the phase compensation layer may be less than a refractive index of the organic insulating layer

Methodology Applied

Scientific EffectRefraction: Refraction

Implementation Method 2

reduces light diffraction

Methodology Applied

Scientific EffectDiffraction: Diffraction

Data Source

PatentUS20230074124A1Display device and electronic device including the same

Publication Date: 2023.03.09 SAMSUNG DISPLAY CO LTD

AI summary

A display device includes: a substrate including a first area, a second area, and a third area; a first pixel circuit in the first area, and a first display element connected to the first pixel circuit; a second display element in the second area; a second pixel circuit in the third area; a connection wiring between the substrate and the second display element and connecting the second display element to the second pixel circuit; a first conductive layer in the first area; and a first protective layer including a same material as the connection wiring and on the first conductive layer.