Inclined Light Emitting Layer Structure for Head-Mounted Displays

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Solution Overview

Problem

Head-mounted displays require high-resolution display devices to effectively implement virtual or augmented reality, but existing technologies struggle to suppress lateral leakage currents between adjacent light emitting layers, leading to image quality deterioration due to color mixture between pixels.

Innovation Solution

A display device structure is designed with a substrate, a first electrode, a light emitting layer, a pixel defining layer, and a second electrode, where the light emitting layer's sides are inclined at specific angles with respect to the pixel defining layer, and functional layers are strategically placed to minimize lateral leakage currents.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Volume of moving object

If the light emitting layer is positioned close to the pixel defining layer to reduce device size, then the resolution and compactness are improved, but lateral leakage current occurs between adjacent light emitting layers causing image quality deterioration

Engineering Contradiction:

Improvedevice sizeVSAvoidlateral leakage current suppression

Core Design Contradiction:

Volume of moving objectVSReliability

Solution Approach 1:

A buffer layer is introduced as an intermediary between the light emitting layer and the pixel defining layer. This buffer layer acts as a mediator that prevents direct contact and potential lateral leakage current paths while allowing the light emitting layer to be positioned close to the pixel defining layer for compact device design. The buffer layer specifically blocks harmful lateral current flow without interfering with the intended light emission function.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Measurement precision

If the light emitting layer is positioned close to the pixel defining layer to achieve high resolution, then the pixel density is improved, but color mixture between adjacent pixels occurs due to lateral leakage current

Engineering Contradiction:

ImproveresolutionVSAvoidcolor mixture between pixels

Core Design Contradiction:

Measurement precisionVSObject-generated harmful factors

Solution Approach 1:

The buffer layer serves as a protective intermediary that prevents lateral leakage current from spreading to adjacent pixels. By blocking this harmful current path, the buffer layer eliminates the cause of color mixture between pixels, thereby preserving the high resolution and color accuracy achieved through close pixel positioning.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The buffer layer is positioned in advance between the light emitting layer and the pixel defining layer to prevent lateral leakage current from reaching adjacent pixels before it can cause color mixture. This preliminary protective action stops the harmful effect at its source, ensuring that high-resolution displays maintain their pixel boundaries even when pixels are closely spaced.

Inventive Principle:

Principle #9Preliminary anti-action

Data Source

PatentUS20250133909A1Display device and method for fabricating the same

Publication Date: 2025.04.24 SAMSUNG DISPLAY CO LTD

AI summary

A display device includes: a substrate; a first electrode on the substrate; a light emitting layer on the first electrode; a pixel defining layer on the light emitting layer; and a second electrode on the light emitting layer. First and second opposite sides of the light emitting layer are located on the pixel defining layer, and have straight line shapes that are inclined at an angle with respect to an upper surface of the pixel defining layer.