Shielded Micro-LED Transistor Channel for Light Leakage

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Solution Overview

Problem

In micro-LED display devices with large viewing angles, light leakage currents occur due to light being directed towards the back of the display, reducing luminance as it reflects on pixel circuits, particularly affecting transistors and impacting display quality.

Innovation Solution

A display device configuration with a first shield positioned between the insulating base and the gate electrode, overlapping channel regions of transistors to block light leakage, ensuring high luminance and improved display quality by shielding the pixel circuit from backside light reflections.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Illumination intensity

If a micro-LED display device uses a large viewing angle design, then the display quality and image clarity are improved, but light leakage currents are generated in the pixel circuits due to backside light reflections, reducing luminance

Engineering Contradiction:

Improvedisplay qualityVSAvoidlight leakage current

Core Design Contradiction:

Illumination intensityVSObject-generated harmful factors

Solution Approach 1:

A shield structure is introduced as an intermediary element positioned between the micro-LED and the pixel circuit. This shield blocks the harmful backside light reflections from reaching the transistor channel regions, preventing light leakage currents while allowing the display to maintain its wide viewing angle and high image quality

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The display device is segmented into distinct functional zones: a light-emitting region (micro-LED), a shielding region (shield structure), and a circuit region (pixel circuit). This spatial segmentation isolates the harmful light reflections from the sensitive transistor channels, resolving the contradiction between wide viewing angle and light leakage prevention

Inventive Principle:

Principle #1Segmentation

2Adaptability or versatility

If the viewing angle is increased to improve display performance, then more light is directed toward the back of the display, but this causes reflected light to irradiate pixel circuits and reduce luminance

Engineering Contradiction:

Improveviewing angleVSAvoidluminance

Core Design Contradiction:

Adaptability or versatilityVSLoss of energy

Solution Approach 1:

The shield acts as a mediator that allows the display to maintain wide viewing angles by blocking only the harmful backside-reflected light from reaching the pixel circuits, while not affecting the forward light emission that provides the display's luminance and viewing angle performance

Inventive Principle:

Principle #24Intermediary (Mediator)

3Ease of manufacture

If no shielding structure is used to maintain device simplicity, then manufacturing is easier, but light leakage currents occur in transistors reducing display performance

Engineering Contradiction:

Improvedevice simplicityVSAvoiddisplay performance

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

A shield structure is introduced as an intermediary element positioned between the micro-LED and the pixel circuit. This shield blocks the harmful backside light reflections from reaching the transistor channel regions, preventing light leakage currents while maintaining the display's wide viewing angle and high image quality

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

Inventive Principle:

Principle #1Segmentation

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 effectively suppresses light leakage currents, maintaining high luminance and display quality even with wide viewing angles by using a first shield to block reflected light, thereby enhancing the operational efficiency of transistors and overall display performance.

Implementation Method 1

a first shield that shields a part of the pixel circuit from light... The first shield is disposed between the insulating base and the first gate electrode in the thickness direction and overlaps a channel region where the first semiconductor layer and the first gate electrode intersect

Methodology Applied

Scientific EffectLight blocking: Absorption (EM radiation)

Data Source

PatentUS20230157075A1Display device

Publication Date: 2023.05.18 MAGNOLIA WHITE CORP

AI summary

According to one embodiment, a display device comprises an insulating base, a light-emitting element, a pixel circuit including a first transistor, and a first shield that shields a part of the pixel circuit from light. The first transistor includes a first semiconductor layer, and a first gate electrode between the insulating base and the first semiconductor layer. The first shield is disposed between the insulating base and the first gate electrode in the thickness direction and overlaps a channel region where the first semiconductor layer and the first gate electrode intersect.