Color Filter Substrate with Scattering Adhesive Layer for OLED Light Extraction

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Solution Overview

Problem

Organic electroluminescent display panels suffer from low light output efficiency due to energy loss in the luminescent process and limited light penetration through multilayer structures, resulting in poor display effects.

Innovation Solution

A color filter substrate with overlapping color filters and increased black matrix thickness, featuring a scattering particle-containing adhesive layer to enhance light uniformity and prevent brightness loss, combined with a cell-aligned array substrate for improved light output efficiency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Illumination intensity

If light is emitted through multilayer structures in organic electroluminescent devices, then light can be generated and displayed, but only about 20% of light can penetrate through due to total reflection and waveguide mode losses

Engineering Contradiction:

Improvelight output efficiencyVSAvoidlight penetration loss

Core Design Contradiction:

Illumination intensityVSLoss of energy

Solution Approach 1:

A scattering layer is introduced as an intermediary component between the organic electroluminescent device and the color filter substrate. This scattering layer contains scattering particles that redirect trapped waveguide modes and total reflected light back into the device, enabling multiple passes through the luminescent layer and increasing overall light extraction efficiency from 20% to significantly higher levels.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The invention converts harmful light loss mechanisms (total reflection at interfaces and waveguide modes) into beneficial multiple light passes. By strategically placing scattering particles, previously lost light is redirected back through the luminescent layer, transforming energy that would have been wasted into useful light output.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

2Illumination intensity

If color filters are arranged adjacent to each other on the color filter substrate, then color display is achieved, but section differences between adjacent color filters cause display non-uniformity

Engineering Contradiction:

Improvedisplay uniformityVSAvoidsection difference between color filters

Core Design Contradiction:

Illumination intensityVSManufacturing precision

Solution Approach 1:

The scattering layer acts as a mediator between adjacent color filters, causing light to scatter and mix at the boundaries between different color regions. This scattering effect smooths out sharp transitions and section differences, resulting in more uniform light output across the display area.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Illumination intensity

If black matrixes are used to isolate color filters, then color purity is improved, but increased black matrix thickness blocks more light and reduces overall light output

Engineering Contradiction:

Improvecolor purityVSAvoidlight blocking by black matrix

Core Design Contradiction:

Illumination intensityVSLoss of energy

Solution Approach 1:

The scattering layer positioned near the black matrixes serves as an intermediary that redirects light attempting to pass through or around the black matrix regions. This scattering mechanism allows light to be redirected into valid color filter areas, reducing the net light blocking effect while preserving the color isolation function of the black matrixes.

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

The solution significantly enhances light output efficiency and display quality by scattering light uniformly and preventing brightness loss, resulting in a better display effect for organic electroluminescent display panels.

Implementation Method 1

The first adhesive layer is provided with scattering particles therein... the scattering particles... may scatter light coming from a display light source

Methodology Applied

Scientific EffectLight scattering: Scattering

Implementation Method 2

each black matrix is at least partially arranged at the overlapped position of the two adjacent color filters... the light corresponding to the sub-pixel may be effectively prevented from being scattered to a sub-pixel adjacent to the sub-pixel

Methodology Applied

Scientific EffectLight absorption: Absorption (EM radiation)

Data Source

PatentUS9575227B2Color filter substrate and manufacturing method thereof, organic electroluminescent display panel and display device

Publication Date: 2017.02.21 BOE TECHNOLOGY GROUP CO LTD

AI summary

The present invention provides a color filter substrate and a manufacturing method thereof, an organic electroluminescent display panel and a display device. The color filter substrate of the present invention comprises a first base, and a plurality of color filters and black matrixes arranged on the first base, wherein two adjacent color filters are at least partially overlapped, and each black matrix is at least partially arranged at the overlapped position of the two adjacent color filters; and the color filter substrate further comprises a first adhesive layer for eliminating section differences between the adjacent color filters or between the color filters and the black matrixes, and the first adhesive layer is provided with scattering particles therein. The color filter substrate can be used in the organic electroluminescent display panel.