Electrochemical Color Changing Blocks for Display Decay Compensation

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Solution Overview

Problem

Liquid crystal display devices face adverse display effects due to color decay in red, green, and blue color filter blocks over time, which existing technologies fail to adequately address.

Innovation Solution

A color changing device with color control circuitry and gold nanoparticles, where silver ions on electrode sheets undergo electrochemical reactions to change color, allowing each color changing block to match subpixel colors and prevent decay-related issues through controlled voltage application.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If traditional color filter blocks are used in liquid crystal display devices, then the display device can show colors, but the color filter blocks will decay over time causing adverse display effects

Engineering Contradiction:

Improvedisplay effect stabilityVSAvoidcolor filter block lifespan

Core Design Contradiction:

ReliabilityVSDuration of action of stationary object

Solution Approach 1:

The patent changes the fundamental mechanism from passive color filtering to active electrochemical color generation. By applying voltage, silver ions are reduced to silver nanoparticles that change color over time, allowing dynamic color adjustment and compensation for decay, thus improving reliability while extending effective display duration

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent replaces the mechanical/optical color filter system with an electrochemical system. Instead of using fixed color filter blocks that physically decay, the invention uses electrochemical reactions to generate color dynamically, substituting a degrading mechanical system with a controllable chemical system that can be replenished through voltage application

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Reliability

If color changing blocks with electrochemical reactions are used, then color decay can be prevented, but the device complexity increases due to additional circuitry and materials

Engineering Contradiction:

Improvecolor stabilityVSAvoidcolor control circuit complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The transparent electrode serves multiple functions: it acts as both the substrate for the color changing blocks and the control electrode for electrochemical reactions. The color control circuit integrates multiple functions including voltage generation, timing control, and color coordination, reducing overall system complexity through functional integration

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The patent uses intrinsic color changes of silver nanoparticles during electrochemical reactions to achieve color display without requiring separate color filtering components. This natural color transformation simplifies the optical path and reduces the number of additional components needed, offsetting the added circuit complexity

Inventive Principle:

Principle #32Color changes

3Adaptability or versatility

If gold nanoparticles are used in the color changing blocks, then color can be changed through electrochemical reactions, but the manufacturing precision requirements increase

Engineering Contradiction:

Improvecolor changing capabilityVSAvoidgold nanoparticle positioning precision

Core Design Contradiction:

Adaptability or versatilityVSManufacturing precision

Solution Approach 1:

The gold nanoparticles automatically reduce to silver nanoparticles through electrochemical reactions when voltage is applied, eliminating the need for precise manual positioning or complex assembly processes. The chemical reaction self-organizes the color-changing material in place, reducing manufacturing precision requirements while maintaining color changing versatility

Inventive Principle:

Principle #25Self-service

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 enables each color changing block to exhibit colors identical to subpixels, improving brightness and preventing display degradation by controlling the power-on time of electrochemical reactions, thus enhancing the display effect.

Implementation Method 1

gold nanoparticles filled in the groove and electrically connected to the transparent electrode, and a plurality of electrode sheets coated with silver ions and covering the groove... apply a predetermined voltage between the electrode sheet and the transparent electrode within a corresponding power-on time period

Methodology Applied

Scientific EffectElectrochemical reaction: Redox Reactions

Data Source

PatentUS10330964B2Color changing device, display module, manufacturing method thereof and display control method

Publication Date: 2019.06.25 BOE TECHNOLOGY GROUP CO LTD

AI summary

The present disclosure provides a color changing device, a display module, a manufacturing method thereof, and a display control method. The color changing device includes a plurality of color changing blocks and a color control circuit connected to the plurality of color changing blocks and configured to control each color changing block to exhibit a corresponding color. Each color changing block includes a transparent electrode, a transparent insulation layer arranged on the transparent electrode and provided with a groove, gold nanoparticles filled in the groove and electrically connected to the transparent electrode, and a plurality of electrode sheets coated with silver ions and covering the groove. The electrode sheets of different color changing blocks are insulated from each other.