Ferroelectric Display Capacitor for Non-Volatile Image Retention

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Solution Overview

Problem

Existing display technologies rely on volatile storage capacitors that require continuous refreshing, leading to high power consumption and loss of image information when power is disconnected.

Innovation Solution

Integration of a non-volatile ferroelectric capacitor into display driving circuits, utilizing a ferroelectric thin film material that retains polarization state after an electric field is removed, allowing for reduced power consumption and maintaining image display without continuous refreshing.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If volatile storage capacitors are used in display driving circuits, then the display can be continuously refreshed, but power consumption increases and image information is lost when power is disconnected

Engineering Contradiction:

Improveimage information retentionVSAvoidpower consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The patent changes the fundamental parameter of capacitor volatility by using ferroelectric materials with non-volatile properties. The ferroelectric capacitor maintains its polarization state and stored charge without continuous power supply, fundamentally altering the volatility parameter from volatile to non-volatile, thereby retaining image information while reducing power consumption.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent employs composite material structure combining ferroelectric thin film with traditional capacitor electrodes and display driving circuit components. This composite approach integrates the non-volatile特性 of ferroelectric materials into the existing volatile display system, achieving both information retention and reduced power consumption.

Inventive Principle:

Principle #40Composite materials

2Duration of action of stationary object

If volatile storage capacitors are used, then the display circuit can operate continuously, but constant refreshing is needed to maintain image display

Engineering Contradiction:

Improvecharge retention timeVSAvoidrefresh power consumption

Core Design Contradiction:

Duration of action of stationary objectVSUse of energy by stationary object

Solution Approach 1:

The patent fundamentally changes the charge retention time parameter from milliseconds (1-2 ms for volatile capacitors) to indefinite retention for non-volatile ferroelectric capacitors. This parameter change eliminates the need for continuous refreshing operations, thereby reducing refresh power consumption while extending charge retention duration.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The ferroelectric capacitor performs preliminary action by storing charge and maintaining polarization state in advance without requiring continuous power supply. This preliminary charge storage action eliminates the need for subsequent continuous refreshing operations, reducing overall energy consumption while extending effective display duration.

Inventive Principle:

Principle #10Preliminary action

3Loss of energy

If voltage is removed from volatile capacitors, then power consumption decreases, but image information is lost and must be rewritten

Engineering Contradiction:

Improvepower loss during refreshVSAvoidimage information loss

Core Design Contradiction:

Loss of energyVSLoss of information

Solution Approach 1:

The patent changes the information retention parameter by using ferroelectric materials that maintain their polarization state even when voltage is removed. This parameter change prevents image information loss during power interruption, eliminating the need for continuous rewriting operations and reducing associated energy losses.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent replaces the disposable nature of volatile capacitor charge storage with non-disposable ferroelectric polarization state retention. Instead of continuously rewriting lost information in volatile capacitors, the ferroelectric capacitor maintains information persistently, eliminating repeated write operations and their associated energy consumption.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

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 non-volatile ferroelectric capacitor reduces power consumption and maintains image display by preserving polarization charge, enabling efficient and low-power operation of electronic displays.

Implementation Method 1

utilizing a ferroelectric thin film material that retains polarization state after an electric field is removed

Methodology Applied

Scientific EffectFerroelectricity:

Data Source

PatentUS12412544B2Non-volatile ferroelectric capacitor and display driving circuit

Publication Date: 2025.09.09 XIDIAN UNIV

AI summary

There is provided a non-volatile ferroelectric capacitor and a display driving circuit. The non-volatile ferroelectric capacitor comprises: a ferroelectric capacitor, which is formed on the surface of a substrate; and a first channel layer and a second channel layer, which are respectively formed on the surface of the substrate. The ferroelectric capacitor comprises a bottom electrode, a ferroelectric thin film and a top electrode, which are sequentially arranged in a stacked manner; the first channel layer is in contact with the bottom electrode; a dielectric material is formed on the surfaces of the ferroelectric capacitor, the first channel layer and the second channel layer; and a first gate electrode and a second gate electrode are formed on the surface of the dielectric material, such that the structure of the ferroelectric capacitor is obtained.