Display Substrate Hole Injection Layer Segmentation for Transmittance

Solution Overview

Problem

Current display substrates face challenges in achieving high transmittance while maintaining display quality, particularly in organic light emitting display devices, where the presence of certain layers can decrease transmittance due to their refractive indices and thicknesses.

Innovation Solution

The display substrate design includes a base substrate with pixel areas divided into emission and transmission areas, where the hole injection layer is only present in the emission area, and the refractive indices of adjacent layers in the transmission area are optimized to prevent transmittance reduction, with specific thicknesses and layer configurations to enhance transmittance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Illumination intensity

If a hole injection layer with high refractive index is disposed in the transmission area, then the display quality is maintained, but the transmittance is reduced

Engineering Contradiction:

ImprovetransmittanceVSAvoiddisplay quality

Core Design Contradiction:

Illumination intensityVSReliability

Solution Approach 1:

The display device is divided into two distinct areas: an emission area where the hole injection layer is present to maintain display quality, and a transmission area where the hole injection layer is absent to maximize transmittance. This spatial segmentation allows each area to have optimized properties for its specific function.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different structural configurations are applied to different regions of the display device. The emission area contains the hole injection layer with high refractive index for optimal display performance, while the transmission area excludes this layer to achieve high transmittance, giving each local region the quality it needs for its purpose.

Inventive Principle:

Principle #3Local quality

2Reliability

If the thickness of the hole injection layer is increased, then the display quality is improved, but the transmittance of the transmission area is reduced

Engineering Contradiction:

Improvedisplay qualityVSAvoidtransmittance

Core Design Contradiction:

ReliabilityVSIllumination intensity

Solution Approach 1:

The display device is divided into two distinct areas: an emission area where the hole injection layer is present to maintain display quality, and a transmission area where the hole injection layer is absent to maximize transmittance. This spatial segmentation allows each area to have optimized properties for its specific function.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different structural configurations are applied to different regions of the display device. The emission area contains the hole injection layer with high refractive index for optimal display performance, while the transmission area excludes this layer to achieve high transmittance, giving each local region the quality it needs for its purpose.

Inventive Principle:

Principle #3Local quality

3Reliability

If high refractive index layers are used in the emission area, then the display quality is maintained, but the overall transmittance of the display substrate is reduced

Engineering Contradiction:

Improvedisplay qualityVSAvoidtransmittance

Core Design Contradiction:

ReliabilityVSIllumination intensity

Solution Approach 1:

The display device is divided into two distinct areas: an emission area where the hole injection layer is present to maintain display quality, and a transmission area where the hole injection layer is absent to maximize transmittance. This spatial segmentation allows each area to have optimized properties for its specific function.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different structural configurations are applied to different regions of the display device. The emission area contains the hole injection layer with high refractive index for optimal display performance, while the transmission area excludes this layer to achieve high transmittance, giving each local region the quality it needs for its purpose.

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

This configuration improves the transmittance of the transmission area without compromising the display quality, by avoiding the negative impact of high refractive index layers typically found in the emission area, thus enhancing the overall performance of the display substrate.

Implementation Method 1

the refractive indices of adjacent layers in the transmission area are optimized to prevent transmittance reduction

Methodology Applied

Scientific EffectRefraction: Refraction

Data Source

PatentUS11024826B2Display substrate

Publication Date: 2021.06.01 SAMSUNG DISPLAY CO LTD

AI summary

A display substrate including a base substrate including a plurality of pixel areas, each of the plurality of pixel areas including an emission area and a transmission area, a pixel circuit layer disposed in the emission area and including at least one transistor, a pixel electrode disposed on the pixel circuit layer and connected to the pixel circuit layer, a hole injection layer selectively disposed on the pixel electrode in the emission area, an emission layer disposed on the hole injection layer of the emission area, an electron injection layer disposed on the base substrate on which the emission layer is disposed; and a common electrode disposed on the base substrate on which the electron injection layer is disposed.