Dual Display System with Reflective Polariser for Power and Readability
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Solution Overview
Problem
Mobile display devices, such as smartphones, consume significant power due to high-resolution image displays, necessitating frequent recharging, and existing reflective bistable LCDs are not optimized for low power consumption in varying ambient lighting conditions.
Innovation Solution
A display system comprising a first image display, an optical diffuser, and a reflective polariser, along with a second image display that uses a Zenithal Bistable Liquid Crystal Display (ZBD) without opaque Thin Film Transistors, enabling multiple display modes including low power consumption and excellent sunlight readability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a high-resolution full colour image display mode is used, then image quality is improved, but power consumption increases
Solution Approach 1:
The display system is segmented into two distinct image displays: a first image display optimized for high-resolution full colour images, and a second image display optimized for low power consumption. This segmentation allows the system to use only the second display for simple information like text and basic graphics, thereby reducing overall power consumption while maintaining the option for high-quality imaging when needed.
Solution Approach 2:
The display system achieves multi-functionality by combining two image displays with different characteristics. The system can operate in multiple modes: using only the low-power second display for basic information, using only the high-quality first display for images, or combining both displays simultaneously to show different types of content on different surfaces, thus adapting to various usage scenarios.
2Illumination intensity
If a reflective display mode is used, then sunlight readability is improved, but power consumption increases due to lack of backlight optimization
Solution Approach 1:
The second image display is specifically optimized for reflective mode operation with local quality enhancements including transparent TFTs that allow light transmission, and optical layers configured to maximize reflection of ambient light. This localized optimization for reflective viewing enables excellent sunlight readability while maintaining low power consumption, as the display only activates pixels when needed rather than requiring continuous backlight illumination.
3Adaptability or versatility
If two image displays are combined, then display functionality is improved, but device complexity increases
Solution Approach 1:
The two image displays are nested within a single display system housing, with the second image display positioned behind or adjacent to the first image display. This nesting arrangement allows both displays to be integrated into a compact form factor, managing the complexity of having dual displays while maintaining adaptability and versatility in display modes.
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 system reduces power consumption, enhances sunlight readability, and minimizes Moiré artefacts while maintaining high image clarity, allowing for extended battery life and effective information conveyance in various lighting conditions.
Implementation Method 1
A second image display which is a Zenithal Bistable Liquid Crystal Display (ZBD)
Implementation Method 2
a specular reflective polariser
Implementation Method 3
a specular reflective polariser disposed between the first image display and the second image display
Implementation Method 4
an optical diffuser layer disposed between the first image display and the reflective polariser
Data Source
AI summary
A display system includes a first image display, a second image display, a specular reflective polariser disposed between the first image display and the second image display, and an optical diffuser layer disposed between the first image display and reflective polariser. The reflective polariser and optical diffuser may be combined into a single film with the reflective polariser disposed on a viewing side of the display system, and the optical diffuser disposed between the first image display and reflective polariser. A controller is configured to address image data to the first image display and the second image display. The controller, the first image display and second image display are configured to selectively operate to pass light through the specular reflective polariser and the optical diffuser layer in accordance with multiple display functions in which the first image display and the second image display have different viewing properties to a viewer.