Electrochromic Display Panel Sub-Pixel Electrode Patterning
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Solution Overview
Problem
The challenge in electrochromic display technology lies in uniformly patterning three-primary-color electrochromic materials over a large area for pixelation, which is crucial for achieving high-quality, energy-efficient display devices.
Innovation Solution
A method involving electrochemical polymerization on an array substrate with sub-pixel electrode groups, where each group is used as a working electrode to form electrochromic layers of different colors, allowing for uniform thickness and large-area patterning of red, green, and blue layers, facilitated by a driving layer for ON/OFF control and gray scale management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional methods are used to pattern electrochromic materials, then material deposition can be achieved, but uniform pixel-level patterning over large area cannot be realized
Solution Approach 1:
The display area is divided into multiple sub-pixel electrode groups (red, green, blue) that are processed independently through sequential electrochemical polymerization. Each sub-pixel group is treated as a separate working electrode, allowing precise local control of material deposition while maintaining overall large-area coverage.
Solution Approach 2:
The array substrate with patterned sub-pixel electrode groups is prepared in advance before the electrochemical polymerization process. The electrode groups are pre-configured with specific spatial arrangements and electrical connections, enabling direct and accurate patterning of electrochromic materials without requiring additional masking or alignment steps during deposition.
2Manufacturing precision
If electrochemical polymerization is used to form electrochromic layers, then uniform thickness and large-area patterning can be achieved, but sequential processing of multiple colors increases manufacturing time
Solution Approach 1:
The manufacturing process uses periodic sequential electrochemical polymerization cycles for different colors (red, green, blue). Each color layer is deposited in a separate controlled cycle, allowing precise thickness control for each layer while maintaining uniformity across the entire large-area substrate through the electrochemical process.
3Manufacturing precision
If sub-pixel electrode groups are used as working electrodes, then pixel-level control and uniform patterning are achieved, but device complexity increases
Solution Approach 1:
The sub-pixel electrode groups serve multiple functions: they act as working electrodes during electrochemical polymerization, provide electrical connection to the electrochromic layers, and enable independent control of different color regions. This multi-functionality reduces the need for separate components and simplifies the overall device architecture despite the patterned structure.
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 approach enables the production of electrochromic display panels with high pixel density and efficient color display, achieving uniform thickness and large-area patterning of RGB layers, while reducing process steps and enabling effective ON/OFF control and gray scale management.
Implementation Method 1
forming a plurality of electrochromic layers disposed in one-to-one correspondence with the plurality of sub-pixel electrode groups by electrochemical polymerization using each of the plurality of sub-pixel electrode groups as a working electrode in sequence
Implementation Method 2
Electrochromic (EC) refers to the fact that a material or device can change its forbidden band width or energy level under the control of an external electric field to selectively absorb a continuous spectrum, thus producing reversible changes in optical properties
Data Source
AI summary
Disclosed are a method of manufacturing an electrochromic display panel and an electrochromic display panel. The manufacturing method includes; manufacturing an array substrate, wherein the array substrate includes a base substrate, a driving layer, and a pixel electrode layer that are stacked in sequence, wherein the pixel electrode layer includes a plurality of sub-pixel electrode groups electrically connected to the driving layer; sequentially using the plurality of sub-pixel electrode groups as working electrodes, and forming a plurality of electrochromic layers disposed in one-to-one correspondence with the plurality of sub-pixel electrode groups by electrochemical polymerization. Different electrochromic layers have different display colors. When any one of the plurality of sub-pixel electrode groups is used as the working electrode, the working electrode is applied with a preset positive voltage, and any one of the electrochromic layers is formed on the corresponding working electrode.