Retractable Electronic Paper Display for Power Management
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Solution Overview
Problem
Existing electronic displays face challenges in balancing power consumption and the ability to show both static text and motion pictures, with electronic paper displays being inefficient for motion pictures due to slow response times and LCDs consuming excessive power for static content.
Innovation Solution
A multi-displays electronic book with a retractable display architecture that combines a flexible electronic paper display with an LCD, allowing users to define static and dynamic display areas, using a control unit to manage display data and optimize power usage by switching between the two based on user needs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If an LCD is used to display static text contents, then the display response time is fast enough for motion pictures, but the power consumption is much higher than that of the electronic paper display
Solution Approach 1:
The display system is segmented into two independent display devices: an electronic paper display for static text content and an LCD for motion pictures. Each display handles specific types of content, allowing the system to optimize power consumption by using the low-power electronic paper display for text while maintaining fast response for videos on the LCD.
Solution Approach 2:
The electronic paper display is made retractable and can be dynamically adjusted in size through a reel device. The display area can be expanded or contracted based on whether motion picture playback is needed, allowing the system to adapt between power-saving mode (text only on e-paper) and performance mode (e-paper expanded for video reference).
2Use of energy by moving object
If an electronic paper display is used to display content, then the power consumption is low, but the display response time is slow and cannot show motion pictures
Solution Approach 1:
The display system is segmented into two independent display devices: an electronic paper display for static text content and an LCD for motion pictures. Each display handles specific types of content, allowing the system to optimize power consumption by using the low-power electronic paper display for text while maintaining fast response for videos on the LCD.
Solution Approach 2:
The patent combines two different display technologies (electronic paper display and LCD) into a single integrated system. The electronic paper display and LCD are physically connected and can work together, with the e-paper display being retractable over the LCD, creating a unified device that leverages the strengths of both display types.
3Area of stationary object
If the flexible electronic paper display is spread out to provide a larger display area, then users can refer to motion pictures while reading text, but the device complexity increases with the reel mechanism
Solution Approach 1:
The electronic paper display is rolled up and stored within the LCD device itself, creating a nested structure where one display device is contained within another. The reel device is integrated into the LCD housing, allowing the e-paper display to be compactly stored when not in use and easily deployed when needed.
Solution Approach 2:
The electronic paper display uses a flexible substrate that allows it to be rolled up and stored in a compact form. The flexibility of the display enables it to be wound around the reel axle and stored within the LCD device, reducing the overall device volume when the display is not in use.
Data Source
AI summary
A multi-displays electronic book having a retractable display, including a first display; a reel device, installed at one side of the first display, having a rotatable axle; and a flexible second display, having a first side and a second side opposing to each other, the first side being fixed at the rotatable axle, and the second side providing a force application end for spreading the flexible second display on the first display.