Liquid Crystal Pixel Electrode Stack to Suppress Flicker

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Solution Overview

Problem

Existing liquid crystal display devices face issues with charge balance disruption and potential shifts due to electron injection from the common electrode, leading to flicker generation and degraded display quality, especially when using oxide semiconductors in driving transistors with low off currents.

Innovation Solution

Incorporating an inorganic insulating film between the common electrode and the first orientation film to prevent electron injection and suppress recombination, thereby maintaining charge balance and reducing potential shifts.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Loss of energy

If oxide semiconductor transistors with low off currents are used in driving transistors, then power consumption is reduced, but charge balance disruption and potential shifts occur due to electron injection from the common electrode

Engineering Contradiction:

Improvepower consumptionVSAvoidcharge balance stability

Core Design Contradiction:

Loss of energyVSReliability

Solution Approach 1:

An inorganic insulating film is introduced as an intermediary layer between the common electrode and the liquid crystal layer. This film acts as a mediator that prevents direct electron injection from the common electrode into the liquid crystal, thereby maintaining charge balance while allowing the use of low-power oxide semiconductor transistors.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The invention converts the potentially harmful electron injection effect into a beneficial structure by introducing the inorganic insulating film. This film prevents the harmful electron injection that would otherwise occur, while the low off-current特性 of oxide semiconductor transistors continues to provide power consumption benefits.

Inventive Principle:

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

2Device complexity

If the common electrode is in direct contact with the liquid crystal layer, then device structure is simplified, but electron injection occurs causing flicker generation and degraded display quality

Engineering Contradiction:

Improvedevice structureVSAvoidelectron injection and flicker

Core Design Contradiction:

Device complexityVSObject-affected harmful factors

Solution Approach 1:

The inorganic insulating film serves as an intermediary layer between the common electrode and the liquid crystal layer, preventing direct contact and the associated electron injection. This resolves the harmful effect while maintaining a relatively simple overall device structure.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The interface between the common electrode and liquid crystal layer is segmented by introducing the inorganic insulating film. This segmentation separates the electrical function of the common electrode from the optical function of the liquid crystal layer, preventing harmful interactions.

Inventive Principle:

Principle #1Segmentation

3Ease of manufacture

If electron injection from the common electrode is allowed, then device manufacturing is simpler, but recombination occurs leading to potential shifts and image instability

Engineering Contradiction:

Improvedevice manufacturingVSAvoidcharge balance and image stability

Core Design Contradiction:

Ease of manufactureVSStability of the object's composition

Solution Approach 1:

The inorganic insulating film acts as a protective intermediary that prevents electron injection and subsequent recombination processes. This maintains charge balance and image stability while adding only a single film layer to the device structure, minimizing manufacturing complexity.

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

This configuration enhances display quality by suppressing flicker generation and maintaining charge balance, resulting in improved image stability and reduced potential shifts, even with oxide semiconductor transistors having low off currents.

Implementation Method 1

Incorporating an inorganic insulating film between the common electrode and the first orientation film to prevent electron injection and suppress recombination

Methodology Applied

Scientific EffectElectron injection prevention:

Data Source

PatentUS12164204B2Display device

Publication Date: 2024.12.10 MAGNOLIA WHITE CORP

AI summary

Disclosed is a display device including a substrate and a plurality of pixels over the substrate. At least one of the plurality of pixels includes a driving transistor and a liquid crystal element electrically connected to the driving transistor. The liquid crystal element has a pixel electrode, an interelectrode insulating film, a common electrode, an inorganic insulating film, a first orientation film, a liquid crystal layer, and a second orientation film. The interelectrode insulating film is located over the pixel electrode. The common electrode is located over the interelectrode insulating film and has a slit overlapping the pixel electrode. The inorganic insulating film is located over the common electrode. The first orientation film is located over the inorganic insulating film. The liquid crystal layer is located over the first orientation film. The second orientation film is located over the liquid crystal layer.