Multilayer Input Output Device with Electrophoretic and Transparent LCD Layers
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Solution Overview
Problem
Current portable computing devices with active matrix liquid crystal displays face significant power consumption issues due to continuous pixel maintenance and backlighting, while electrophoretic displays offer low power usage but are limited by monochrome output and slow refresh rates, making them unsuitable for interactive user interfaces.
Innovation Solution
A multilayer input/output device comprising a low-power electrophoretic display layer, a fast and transparent color display layer, and an input layer, where the additional display layer is activated only when necessary to provide high-frame rate and color output, allowing the electrophoretic display to show through when power is removed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If an active matrix liquid crystal display (LCD) is used, then high frame rate and color display are achieved, but power consumption increases significantly
Solution Approach 1:
The display is segmented into two independent layers: an electrophoretic display layer for low-power static content and a transparent LCD layer for high-frame-rate dynamic content. Each layer operates independently, allowing the system to use only the necessary display technology for each type of content, thereby reducing overall power consumption while maintaining high frame rate capability when needed.
Solution Approach 2:
The transparent LCD layer is activated periodically only when dynamic content requiring high frame rate is to be displayed, rather than operating continuously. This periodic activation significantly reduces power consumption compared to continuous operation, while still providing high frame rate display when needed.
2Use of energy by moving object
If an electrophoretic display is used, then power consumption is reduced, but refresh rate becomes too slow for interactive user interfaces
Solution Approach 1:
The display functionality is segmented between two layers with different characteristics: the electrophoretic layer handles static content with excellent power efficiency, while the transparent LCD layer handles dynamic content requiring fast refresh rates. This segmentation allows each layer to optimize for its intended purpose without compromise.
Solution Approach 2:
The transparent LCD layer acts as an intermediary that provides fast refresh rate capability for interactive content while allowing the electrophoretic display to maintain its low-power operation for static content. The two layers work together, with the transparent LCD mediating between the user's interactive needs and the power-efficient electrophoretic display.
3Ease of manufacture
If a color filter is added to electrophoretic display, then color output is achieved, but contrast and resolution are significantly reduced
Solution Approach 1:
The transparent LCD layer serves as an intermediary that provides color output without degrading the resolution of the underlying electrophoretic display. The LCD layer's pixel structure is designed to be finer than the electrophoretic display pixels, ensuring that the overall resolution is determined by the electrophoretic layer, while the LCD adds color capability.
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
Combines the low-power advantages of electrophoretic displays with the high-frame rate and color capabilities of traditional displays, enabling efficient and responsive user interaction without continuous power consumption.
Implementation Method 1
electrophoretic displays reflect light like ordinary paper and are capable of holding text and images without drawing electricity or using processor power
Implementation Method 2
The second display layer is a fast, transparent display or a color display positioned on top of the electrophoretic display
Data Source
AI summary
A multilayer input/output device with a low power and a high resolution display suitable for use in paper-like computing includes a first display layer, a second display layer, an input layer and control logic. The first display layer is a low power display. The second display layer is a fast, transparent display positioned on top of the first layer. The input layer is a layer for detecting input movements or gestures by the user. The control logic is coupled to the first display layer, the second display layer and the input layer for controlling their operation according the method of the present invention. The method of the present invention selectively operates the second display layer to present movement detected by the input layer. At a predetermined time, the information presented on the second display is transferred to and presented on the first display.