Metal Substrate as Storage Capacitor Electrode in Display Devices

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Solution Overview

Problem

Metal substrates in display devices cause parasitic capacitance, which distorts data voltage due to their conductive nature, limiting the thin profile and flexibility of the display and affecting the performance of active matrix type flat panel displays.

Innovation Solution

A display device with a metal substrate where the metal substrate is used as an electrode for the storage capacitor, and a method involving a plurality of storage lines and a voltage source to generate and supply a storage voltage, connected to the metal substrate through a conductive path, thereby preventing parasitic capacitance by utilizing the metal substrate as part of the storage capacitor.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Length of moving object

If a metal substrate is used to achieve thin profile and flexibility, then the thinness and flexibility of the display device is improved, but parasitic capacitance is generated that distorts data voltage

Engineering Contradiction:

ImprovethicknessVSAvoidparasitic capacitance

Core Design Contradiction:

Length of moving objectVSObject-generated harmful factors

Solution Approach 1:

The patent converts the harmful parasitic capacitance effect into a beneficial feature by intentionally using the metal substrate's capacitance as the storage capacitor. The metal substrate, which was previously a source of harmful parasitic capacitance, is now utilized as a functional component (storage capacitor electrode) that serves both structural and electrical storage purposes, thereby eliminating the need for separate storage capacitor structures and preventing voltage distortion.

Inventive Principle:

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

Solution Approach 2:

The metal substrate performs multiple functions simultaneously: it serves as the structural support base, provides the thin profile and flexibility, and functions as one of the electrodes for the storage capacitor. This multi-functionality eliminates the need for additional insulating layers and separate capacitor structures, resolving the contradiction between thinness and parasitic capacitance.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Reliability

If a substrate insulation film is formed on the metal substrate to prevent parasitic capacitance, then the insulation is improved, but the thin profile is compromised

Engineering Contradiction:

ImproveinsulationVSAvoidthickness

Core Design Contradiction:

ReliabilityVSLength of moving object

Solution Approach 1:

The patent extracts the insulation function from a separate physical layer and instead achieves insulation through electrical connection management. By connecting the metal substrate to the storage capacitor electrode, the need for a physical insulation film is eliminated, as the electrical potential difference provides the necessary isolation.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The substrate and storage capacitor electrode functions are merged into a single component. The metal substrate simultaneously serves as the structural support and as one electrode of the storage capacitor, eliminating the need for separate insulation layers and maintaining the thin profile while providing necessary electrical isolation.

Inventive Principle:

Principle #5Merging (Combining)

3Reliability

If glass substrate is used to maintain insulation, then the insulation is improved, but the durability and thinness are limited

Engineering Contradiction:

ImproveinsulationVSAvoiddurability

Core Design Contradiction:

ReliabilityVSStrength

Solution Approach 1:

The patent changes the material parameter from glass to metal, and simultaneously changes the electrical configuration parameter by connecting the metal substrate to the storage capacitor. This parameter change transforms the metal substrate from a harmful parasitic capacitance source into a beneficial functional component, achieving both durability and thinness while maintaining effective insulation through electrical potential management.

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 configuration effectively prevents parasitic capacitance, maintaining data voltage integrity and enabling flexible, thin-profile displays by using the metal substrate as an electrode for the storage capacitor, thus enhancing the performance and durability of active matrix type flat panel displays.

Implementation Method 1

a metal substrate used as an electrode for a storage capacitor

Methodology Applied

Scientific EffectCapacitance: Capacitance

Data Source

PatentUS7864286B2Display device and method with metal substrate including a pixel array and storage capacitor in combination in which plural storage lines connected thereto are connected to the metal substrate

Publication Date: 2011.01.04 LG PHILIPS LCD CO LTD

AI summary

A display device and a method of manufacturing the same is disclosed, to prevent a parasitic capacitance caused by a metal substrate. The display device comprises a metal substrate including a pixel array provided with a plurality of storage lines to supply a storage voltage, and a supplying line connected to the storage lines; and a voltage source, connected to the supplying line, which generates the storage voltage, wherein the metal substrate is connected to any one of an output terminal of the voltage source, the supplying line and the storage lines.