Dual Liquid Crystal Panels for Wearable Display Power Reduction
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Solution Overview
Problem
Wearable devices like smartwatches face challenges in displaying both small and large amounts of information while minimizing power consumption due to the high energy requirements of transmissive color liquid crystal displays and organic EL displays.
Innovation Solution
A liquid crystal display configuration comprising a first panel for character and graphic displays using a polymer dispersed or network liquid crystal, and a second panel for information displays with a color filter, both laminated with a transparent air layer to reduce power consumption and enhance visibility, along with a tilt detecting unit to manage display modes based on user interaction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If transmissive color liquid crystal display or organic EL display is used for the watch, then display with large amount of information is enabled, but power consumption increases
Solution Approach 1:
The display system is segmented into two distinct panels: a first liquid crystal panel for character display and a second liquid crystal panel for information display. This segmentation allows the device to use only the appropriate panel for each display task, reducing overall power consumption while maintaining full information display capability when needed.
Solution Approach 2:
The system dynamically switches between different display modes and panels based on the amount of information that needs to be displayed. The control unit activates only the necessary panel (first or second) depending on whether character display or information display is required, creating a dynamic power management strategy.
2Loss of information
If transmissive color liquid crystal display is used, then display with large amount of information is enabled, but battery capacity requirement increases
Solution Approach 1:
By segmenting the display into two specialized panels, the system can operate in low-power mode using only the first panel for basic character display, thereby reducing the overall battery capacity needed while still providing full information display capability through the second panel when required.
3Use of energy by moving object
If reflective or semi-transmissive liquid crystal display is used, then power consumption is reduced, but display with large amount of information is limited
Solution Approach 1:
The system dynamically adapts its display capability by switching between the first liquid crystal panel for power-efficient character display and the second liquid crystal panel for comprehensive information display, providing dynamic adjustment of information display capability based on actual needs.
Solution Approach 2:
The display system achieves multi-functionality by combining two liquid crystal panels that can operate independently or together, allowing the same device to perform both power-efficient character display and comprehensive information display based on different operational requirements.
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
Enables efficient display of both small and large information amounts with reduced power consumption, extending battery life and improving display brightness and visibility, especially in wearable devices.
Implementation Method 1
a liquid crystal layer 22 having a polymer dispersed liquid crystal or a polymer network liquid crystal
Implementation Method 2
a transparent member 13 which contacts the lower, second substrate 20 of the first liquid crystal panel 12. The transparent member 13 has a refractive index different from that of the lower, second substrate 20
Data Source
Figure 1
Figure 2A~2B
Figure 3~4
AI summary
A liquid crystal display (50) includes a first liquid crystal panel (12), a second liquid crystal panel (14), and a transparent member (13) sandwiched between the first and second liquid crystal panels (12), (14). The first liquid crystal panel (12) comprises substrates (20), (21) which are disposed opposite each other, and a liquid crystal layer (22) of a polymer dispersed type sandwiched between the substrates (20), (21). The second liquid crystal panel (14) comprises substrates (30), (31) which are disposed opposite each other, a liquid crystal layer (32) sandwiched between the substrates (30), (31), a color filter (38) provided on the substrate (31), and polarizing plates (42), (44) provided on the substrates (30), (31), respectively. The transparent member (13) is in contact with the substrate (20), and has a refractive index different from a refractive index of the substrate (20).