Transparent Display Phase Delay Film Low Power Operation
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Solution Overview
Problem
Transparent displays with IPS/FFS and multi-domain VA modes have high power consumption due to their normally black display mode, limiting their application fields.
Innovation Solution
A transparent display configuration featuring a backlight module, lower and upper polarizers, and phase delay thin films with alternating phase delays of λ/2 in transparent and display regions, allowing for low power consumption by maintaining transparency without power supply.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the transparent display uses IPS/FFS or multi-domain VA modes with normally black display mode, then the display quality (wide view angle, high contrast) is improved, but the power consumption increases significantly
Solution Approach 1:
The patent inverts the traditional display mode by making the transparent regions the default state (bright) rather than the opaque regions being the default state (black). By using phase delay thin films with λ/2 retardation in transparent regions and 0 retardation in display regions, the display achieves normally bright operation, eliminating the need for continuous power supply to maintain transparency while preserving high display quality when powered.
2Stability of the object's composition
If voltages are continuously applied to maintain transparent condition, then the transparency is preserved, but the power consumption becomes large
Solution Approach 1:
The phase delay thin film is pre-configured with specific retardation characteristics (λ/2 in transparent regions, 0 in display regions) before operation. This preliminary configuration allows the transparent regions to maintain their transparency without requiring continuous voltage application, as the optical path difference is already optimized to preserve the bright state by default.
3Manufacturing precision
If the transparent display is designed for high display quality with wide view angle and high contrast, then the display performance is improved, but the application field is restricted due to high power consumption
Solution Approach 1:
The patent changes the critical parameter of phase delay retardation to achieve the desired balance. By setting the phase delay thin film to provide λ/2 retardation in transparent regions and 0 retardation in display regions, the system achieves normally bright operation with high display quality, thereby expanding application fields to include scenarios where low power consumption is critical.
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 configuration reduces power consumption by maintaining transparent regions in a bright state without power, while enabling high display quality with wide view angles and high contrast when powered.
Implementation Method 1
the phase delay thin film comprises a plurality of first phase delay thin films located in the plurality of transparent regions and a plurality of second phase delay thin films located in the plurality of display regions, and the plurality of first phase delay thin films provide a first phase delay, and the plurality of second phase delay thin films provide a second phase delay, and a difference of the first phase delay and the second phase delay is λ/2
Implementation Method 2
a polarization axis of the upper polarizer is perpendicular with a polarization axis of the lower polarizer
Implementation Method 3
the liquid crystal layer does not change a vibration direction of a linear polarization light in condition of no power supply
Data Source
AI summary
The present invention discloses a transparent display, comprising a backlight module, a lower polarizer, a phase delay thin film, a liquid crystal layer and an upper polarizer, which are sequentially stacked up in an image display direction, and the transparent display alternately comprises a plurality of transparent regions and a plurality of display regions in a first direction perpendicular with the image display direction, and the phase delay thin film comprises a plurality of first phase delay thin films located in the plurality of transparent regions and a plurality of second phase delay thin films located in the plurality of display regions, and the plurality of first phase delay thin films provide a first phase delay, and the plurality of second phase delay thin films provide a second phase delay, and a difference of the first phase delay and the second phase delay is λ/2.