Electrochromic Display Charge Recovery and Multicolor Control
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Solution Overview
Problem
Conventional electrochromic display devices face challenges in reducing power consumption during pattern rewriting, as they require significant electric charges for color forming and erasing, which limits their efficiency, especially in applications like video reproduction.
Innovation Solution
The electrochromic display device incorporates a switching element and an electric storage element, allowing stored charges to be used for driving the display, reducing the reliance on external power sources and minimizing charge consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If an electrochromic display device uses conventional oxidation-reduction reaction for color forming and erasing, then color change functionality is achieved, but response speed is slow (approximately 10 seconds)
Solution Approach 1:
The patent applies preliminary action by pre-fixing electrochromic compounds near the electrode surface before operation. This positioning allows the compounds to be immediately available for rapid electrochemical reactions when voltage is applied, eliminating the need for diffusion processes and achieving response speeds of approximately one second for both color forming and erasing operations
2Adaptability or versatility
If a color filter is provided to perform multicolor display, then color variety is improved, but white reflection ratio and contrast ratio decrease
Solution Approach 1:
The patent applies local quality by using different electrochromic compounds with specific voltage thresholds in different regions or layers of the display device. Each compound responds to specific voltage ranges to produce different colors (blue, green, red), enabling multicolor display without absorbing light like traditional color filters. This localized functional differentiation achieves full-color display while maintaining high white reflection ratio and contrast ratio
Solution Approach 2:
The patent applies parameter changes by utilizing electrochromic compounds with different threshold voltages to produce different colors. By controlling the applied voltage parameters, the device can selectively activate specific electrochromic compounds to form desired colors. This voltage-based control mechanism enables multicolor display without the light absorption inherent in conventional color filter approaches
3Ease of operation
If electric charges are supplied from power source for color forming and erasing, then display functionality is achieved, but power consumption is high during pattern rewriting
Solution Approach 1:
The patent applies discarding and recovering by collecting and storing the electric charges generated during color erasing operations in a power storage element. These recovered charges are then reused for subsequent color forming operations, creating a cyclic energy recovery system that significantly reduces the amount of external power needed for pattern rewriting operations
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 significantly reduces the amount of electric charges needed from the power source during color forming and erasing, enhancing the device's efficiency and extending its usage in applications like electronic paper and photochromic glass.
Implementation Method 1
A phenomenon in which voltage is applied to cause a reversible oxidation-reduction reaction and to reversibly change the color is referred to as electrochromism
Implementation Method 2
voltage is applied to cause a reversible oxidation-reduction reaction and to reversibly change the color
Data Source
AI summary
An electrochromic display device includes an electrochromic display element including a display electrode, an electrochromic layer provided on the display electrode, an opposing electrode facing the display electrode, and an electrolyte layer sandwiched between the display electrode and the opposing electrode. The electrochromic display device further includes a switching element, and a electric storage element. The display electrode is connected with the opposing electrode by a power source or the electric storage element via the switching element, and when performing driving, part of electric charges, which are stored in the electrochromic display element, are applied for charging the electric storage element, or electric charges in the electric storage element that has been charged are used for driving the electrochromic display element.