Transparent Voltage-Dividing Common Electrodes for Display Aperture Ratio

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Solution Overview

Problem

Display devices face challenges in maintaining a high aperture ratio while controlling liquid crystal elements, as traditional voltage-dividing methods often require metal layers that interfere with luminous zones and lead to electromagnetic interference and color washout phenomena.

Innovation Solution

The implementation of transparent voltage-dividing common electrodes that are electrically isolated and do not overlap with pixel electrodes, allowing for voltage division without reducing the aperture ratio and minimizing electromagnetic interference by using materials like indium tin oxide, thus avoiding the need for metal layers in luminous zones.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If traditional metal layers are used for voltage division, then voltage control is achieved, but electromagnetic interference and color washout occur

Engineering Contradiction:

Improvevoltage controlVSAvoidelectromagnetic interference

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent changes the material parameter of the common electrode from metal to transparent conductive material (such as ITO), which fundamentally alters the electrical and optical properties. This material substitution eliminates electromagnetic interference while maintaining voltage division functionality, directly resolving the contradiction between reliable voltage control and electromagnetic interference reduction.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent employs transparent conductive materials that, while having higher resistance than metal, provide sufficient voltage division capability without the harmful electromagnetic effects. These materials serve the voltage division function adequately without the long-term reliability issues of metal layers in luminous zones.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

2Reliability

If metal layers are used for voltage division, then voltage control is achieved, but aperture ratio is reduced

Engineering Contradiction:

Improvevoltage controlVSAvoidaperture ratio

Core Design Contradiction:

ReliabilityVSArea of stationary object

Solution Approach 1:

By changing the material from metal to transparent conductive material, the patent achieves voltage division with materials that can be made transparent. This allows the common electrode to occupy minimal space in the luminous zone, thereby maintaining a high aperture ratio while still providing effective voltage control for liquid crystal manipulation.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent uses transparent conductive materials that enable voltage division without requiring large面积的 metal layers. These materials can be applied in thin, transparent forms that do not significantly block light, thus preserving the aperture ratio while achieving the necessary voltage control functionality.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

3Area of stationary object

If transparent conductive materials are used, then aperture ratio is improved, but electromagnetic interference is minimized

Engineering Contradiction:

Improveaperture ratioVSAvoidelectromagnetic interference

Core Design Contradiction:

Area of stationary objectVSObject-affected harmful factors

Solution Approach 1:

The patent fundamentally changes the material parameter from metal to transparent conductive material (such as ITO, IZO, or IGZO). This parameter change simultaneously achieves two benefits: the transparent nature improves aperture ratio by allowing light passage, and the non-metallic nature minimizes electromagnetic interference, thus resolving both aspects of the contradiction.

Inventive Principle:

Principle #35Parameter changes

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 solution enhances the aperture ratio of display devices by effectively controlling liquid crystal elements while reducing electromagnetic interference and preventing color washout, without compromising the display's brightness or clarity.

Implementation Method 1

The voltage-dividing switch is configured to divide the data voltage on the second pixel electrode to one of the transparent voltage-dividing common electrodes

Methodology Applied

Scientific EffectElectrical conduction: Conduction (electrical)

Implementation Method 2

minimizing electromagnetic interference by using materials like indium tin oxide

Methodology Applied

Scientific EffectElectromagnetic shielding: Faraday Cage

Implementation Method 3

The display device may control a liquid crystal element to perform deflection by using an electrical field that is formed between the pixel electrode and the array side common electrode

Methodology Applied

Scientific EffectDielectric response: Dielectric

Data Source

PatentUS11520189B2Display device

Publication Date: 2022.12.06 AU OPTRONICS CORP

AI summary

A display device includes a plurality of transparent voltage-dividing common electrodes and a plurality of pixel units. The transparent voltage-dividing common electrodes are electrically isolated from each other in a first direction. Each of the pixel units includes a first pixel electrode, a second pixel electrode, and a voltage-dividing switch. The first pixel electrode is configured to receive a data voltage. The second pixel electrode is configured to receive the data voltage. The voltage-dividing switch is configured to divide the data voltage on the second pixel electrode to one of the transparent voltage-dividing common electrodes.