Electrochromic Display Yttrium Oxide Crosstalk Suppression
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Solution Overview
Problem
Conventional electrochromic display devices suffer from crosstalk between pixels and inter-layer color mixing, leading to blurring and resolution degradation, and the use of nickel oxide layers reduces color vividness and brightness due to its black color.
Innovation Solution
Incorporating a yttrium-containing metal oxide layer between the electrochromic layer and the electrode, which suppresses crosstalk and enhances light resistance without the negative optical effects of nickel oxide.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a nickel oxide layer is provided between the display electrode and the electrochromic layer to suppress crosstalk between pixels, then crosstalk is suppressed, but color vividness and brightness are reduced due to the black color of nickel oxide
Solution Approach 1:
The patent introduces a tungsten oxide layer as an intermediary substance between the display electrode and the electrochromic layer. This tungsten oxide layer serves as the mediating component that suppresses crosstalk between pixels while maintaining optical transparency, thereby resolving the contradiction between crosstalk suppression and brightness/color vividness preservation
Solution Approach 2:
The patent changes the material parameter from nickel oxide to tungsten oxide, and controls the oxygen partial pressure during heating treatment to adjust the oxidation state of tungsten. By controlling the oxygen partial pressure to be 10^-3 Pa or lower, the tungsten oxide is reduced to a state that provides both crosstalk suppression and maintains optical transparency, thus resolving the contradiction
2Adaptability or versatility
If multiple display electrode layers and electrochromic color development layers are stacked to achieve full-color display, then color display capability is improved, but crosstalk between layers occurs leading to color mixing and display image retention problems
Solution Approach 1:
The patent divides the display structure into multiple independent layers (multiple display electrode layers and multiple electrochromic layers) that can be independently controlled. Each layer is separated by tungsten oxide layers that prevent inter-layer crosstalk, enabling full-color display while maintaining display image retention property
Solution Approach 2:
The patent introduces tungsten oxide layers as intermediary components between adjacent display electrode layers and electrochromic layers. These intermediary layers prevent electrical and ionic crosstalk between layers, thereby preventing color mixing while maintaining the multi-layer structure needed for full-color display
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 electrochromic display device achieves improved image retention and light resistance while maintaining vivid color display and brightness, effectively addressing the issues of crosstalk and color mixing.
Implementation Method 1
An electrochromism phenomenon is a phenomenon that a specific substance causes a reversible oxidation-reduction reaction upon application of a voltage and changes to various colors
Implementation Method 2
An electrochromic display device is a display device utilizing color development and color fading (hereinafter, referred to as color development and fading) of an electrochromic compound that causes such an electrochromism phenomenon
Data Source
AI summary
Provided is an electrochromic display device, including: a pair of electrodes facing each other; an electrochromic layer provided to one of the pair of electrodes: and an electrolytic solution layer provided between the electrodes facing each other, wherein the electrochromic display device includes an yttrium-containing metal oxide layer between the electrochromic layer and the electrode to which the electrochromic layer is provided.