OLED Display Panel Layout for Uniform Ink-Jet Emission Layers

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Solution Overview

Problem

The challenge of achieving uniformity in the organic light-emitting layer of OLED display panels with high resolution using ink-jet printing, leading to poor display effects due to uneven distribution of the organic solution in small pixel openings.

Innovation Solution

The implementation of a display panel design with auxiliary dummy openings in the non-display region, where the organic solution is initially printed into these openings to stabilize before being applied to effective pixel openings, ensuring uniformity and stability of the organic light-emitting layer, while the auxiliary dummy portions do not emit light and do not expand the non-display region.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If ink-jet printing is used to form the organic light-emitting layer in high resolution, then the display resolution is improved, but the uniformity of the organic light-emitting layer deteriorates due to uneven distribution in small pixel openings

Engineering Contradiction:

Improvedisplay resolutionVSAvoiduniformity of organic light-emitting layer

Core Design Contradiction:

Measurement precisionVSManufacturing precision

Solution Approach 1:

The patent introduces auxiliary dummy openings in the non-display region where ink-jet printing is performed first to stabilize the printing process. This preliminary action allows the printing system to achieve stable droplet ejection and distribution patterns before printing the effective pixel openings, thereby ensuring uniform organic light-emitting layer formation in the display region while maintaining high resolution

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The auxiliary dummy openings serve as an intermediary region that mediates between the printing system and the effective pixel openings. By providing a transition zone for printing stabilization, these dummy openings enable the system to achieve both high resolution and uniformity in the final display region

Inventive Principle:

Principle #24Intermediary (Mediator)

2Manufacturing precision

If auxiliary dummy openings are added in the non-display region, then the uniformity of organic light-emitting layer is improved, but the area of non-display region increases

Engineering Contradiction:

Improveuniformity of organic light-emitting layerVSAvoidarea of non-display region

Core Design Contradiction:

Manufacturing precisionVSArea of stationary object

Solution Approach 1:

The auxiliary dummy openings are strategically placed only in the non-display region with specific local density and distribution patterns. This local quality approach allows the printing stabilization to occur in non-critical areas while preserving display quality, minimizing the impact on overall display area

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent uses partial action by implementing auxiliary dummy openings only in the non-display region rather than across the entire panel. This selective approach provides sufficient printing stabilization for achieving uniformity in the display region while minimizing the area occupied by auxiliary structures

Inventive Principle:

Principle #16Partial or excessive action

3Length of moving object

If the non-display region is minimized for narrow frame design, then the device thickness and frame size are reduced, but the uniformity of organic light-emitting layer deteriorates due to insufficient space for printing stabilization

Engineering Contradiction:

Improveframe sizeVSAvoiduniformity of organic light-emitting layer

Core Design Contradiction:

Length of moving objectVSManufacturing precision

Solution Approach 1:

The patent resolves the space conflict by utilizing the non-display region dimensionally - placing auxiliary dummy openings in the peripheral non-display area rather than expanding the overall device dimensions. This allows printing stabilization without increasing frame size, enabling narrow frame design while maintaining uniformity

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

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 approach enhances the uniformity of the organic light-emitting layer, improves display quality, and allows for a narrow frame design by minimizing the non-display region without affecting the display effect.

Implementation Method 1

The challenge of achieving uniformity in the organic light-emitting layer of OLED display panels with high resolution using ink-jet printing

Methodology Applied

Scientific EffectInk-jet printing:

Data Source

PatentUS12514073B2Display panel and display apparatus

Publication Date: 2025.12.30 BEIJING BOE TECH DEV CO LTD

AI summary

Disclosed is a display panel. The display panel includes a substrate, a first electrode layer, a pixel defining layer, a light-emitting layer, a second electrode layer, and a peripheral conductive structure. When the light-emitting layer is formed through an ink-jet printing process, an organic solution may be printed into auxiliary dummy openings in an initial printing phase, and then printed into effective pixel openings after printing becomes stable.