Electrochromic PDLC Hybrid Display for Low-Power Still and Moving Images
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Solution Overview
Problem
Electrochromic devices struggle to achieve both still and moving images due to slow response speed and lack of memory properties, while LCDs require continuous power to maintain images, limiting their use in applications like electronic paper and advertising boards.
Innovation Solution
A display device incorporating a polymer dispersed liquid crystal (PDLC) layer with electrochromic layers and an electrolyte layer, where specific electrode configurations and voltage applications allow for both still and moving images to be realized, leveraging the memory characteristics of electrochromic materials to maintain image states without continuous power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If electrochromic devices are used, then memory characteristics are achieved, but response speed decreases
Solution Approach 1:
The patent combines electrochromic layers with PDLC layers in a single display device structure. The electrochromic layers provide memory characteristics for still images, while the PDLC layer provides fast response for moving images. This merging allows the device to achieve both slow-response memory functionality and fast-response dynamic display capabilities simultaneously.
2Speed
If LCD is used, then acceptable moving images are realized, but memory properties are lost
Solution Approach 1:
The patent merges LCD technology with electrochromic technology in a multi-layer structure. The LCD/PDLC layer handles fast moving image display, while the electrochromic layers maintain memory properties for still images. This combination allows the device to retain memory functionality while achieving acceptable moving image quality.
3Speed
If continuous power supply is provided to LCD, then moving images are maintained, but energy consumption increases
Solution Approach 1:
The patent uses periodic voltage application to the electrochromic layers. Voltage is applied only when image state changes are needed, and the electrochromic materials maintain their state without continuous power due to their memory characteristics. This periodic action significantly reduces energy consumption compared to continuous power supply requirements of conventional LCDs.
Solution Approach 2:
The electrochromic layers serve themselves by maintaining their color state without external power input. Once voltage is applied to change the state, the material retains that state autonomously, eliminating the need for continuous energy input to maintain the display state.
4Stability of the object's composition
If electrochromic layers are used, then still images are maintained without power, but moving image capability is reduced
Solution Approach 1:
The patent combines electrochromic layers with PDLC layers where each layer type handles different display requirements. The electrochromic layers maintain still images without power, while the PDLC layer provides fast response for moving images. This merging creates a unified display system that achieves both still image stability and moving image responsiveness.
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 the display device to effectively display both still and moving images using the memory properties of electrochromic layers, maintaining image states without continuous power supply, thus addressing the limitations of existing technologies.
Implementation Method 1
An electrochromic device includes an electrochromic material that changes color in response to received charges (e.g., electrons and/or holes)
Implementation Method 2
A display device including a plurality of first electrodes and a plurality of second electrodes; a polymer dispersed liquid crystal (PDLC) layer between the first electrodes and the second electrodes
Data Source
AI summary
Provided are display devices using electrochromism and PDLC and methods of driving the display devices. A display device may include a plurality of first electrodes and a plurality of second electrodes; a polymer dispersed liquid crystal (PDLC) layer between the first electrodes and the second electrodes; a plurality of third electrodes and a plurality of fourth electrodes; a plurality of electrochromic layers between the third electrodes and the fourth electrodes; and an electrolyte layer between the third electrodes and the fourth electrodes.