Dual-Mode Display Panel Using Reflective Polarizer for Zero-Power Image
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Solution Overview
Problem
Conventional image display apparatuses, such as televisions and computer monitors, face challenges in maintaining a visually appealing appearance when turned off, as a black screen can detract from the installation space, and keeping them in an ON state to avoid this issue results in significant power consumption.
Innovation Solution
A display panel that operates in both external light transmission and reflection modes, using a liquid crystal layer and polarizing films to display a specific image using external light, allowing for power-saving or zero-power operation when not in use by reflecting or transmitting light, depending on the configuration of the electrode layers and polarizing films.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the image display apparatus is kept in an ON state to avoid displaying a black screen, then the aesthetic appeal of the installation space is improved, but power consumption increases significantly
Solution Approach 1:
The display panel utilizes external light sources (natural or artificial) to illuminate the displayed image, eliminating the need for internal backlighting during operation. The panel passively reflects or transmits external light to create the visual display, allowing the system to serve itself by using ambient environmental light rather than consuming additional power for illumination.
Solution Approach 2:
The display panel dynamically adjusts its optical parameters (transmission vs. reflection mode) based on environmental lighting conditions. By changing the polarization state and optical configuration in response to external light availability, the panel maintains aesthetic appeal while adapting to different lighting scenarios without requiring continuous high power consumption.
2Use of energy by moving object
If a conventional display panel is used in OFF state, then power consumption is minimized, but the black screen spoils the beauty of the installation space
Solution Approach 1:
The display panel utilizes external light sources (natural or artificial) to illuminate the displayed image, eliminating the need for internal backlighting during operation. The panel passively reflects or transmits external light to create the visual display, allowing the system to serve itself by using ambient environmental light rather than consuming additional power for illumination.
Solution Approach 2:
The display panel serves dual functions: it acts as a conventional display when power is supplied, and as an aesthetically pleasing light-modulating element even in low-power or OFF states. The same structural components (polarizing films, liquid crystal layer, electrode patterns) enable both active display functionality and passive aesthetic contribution, making the panel universally useful across different power states.
3Use of energy by moving object
If a display panel uses external light transmission mode, then power consumption is reduced, but the display visibility and image contrast are limited
Solution Approach 1:
The display panel dynamically switches between transmission mode and reflection mode based on environmental lighting conditions and viewing requirements. The liquid crystal layer and polarizing films are configured to enable flexible optical path changes, allowing the system to adapt its operating mode in real-time to maintain optimal image contrast and visibility while minimizing power consumption.
Solution Approach 2:
The display panel employs a composite structure combining transparent substrates, liquid crystal materials, and polarizing films with specific optical properties. This composite construction enables the panel to effectively modulate external light in both transmission and reflection modes, maintaining good image contrast and visibility while using minimal power by leveraging the optical properties of the combined materials.
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 the display of a specific image with minimal or zero power consumption in the OFF state, enhancing the aesthetic appeal of the installation space without the need for continuous power usage.
Implementation Method 1
a liquid crystal layer between the first plate and the second plate, which has a first molecular arrangement in which a polarization direction of incident light is changed by a preset angle in an entire region of the liquid crystal layer when a liquid crystal driving voltage is not applied
Implementation Method 2
a first polarizing film formed on an outer surface of the first substrate and having a first polarization axis; a second polarizing film formed on an outer surface of the second substrate and having a second polarization axis
Data Source
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AI summary
A display panel is driven in any one mode of an external light transmission mode and an external light reflection mode. The display panel includes an upper plate including a first substrate, at least one first electrode layer formed on an inner surface of the first substrate, and a first polarizing film formed on an outer surface of the first substrate and having a first polarization axis, a lower plate including a second substrate, at least one second electrode layer formed on an inner surface of the second substrate, and a second polarizing film formed on an outer surface of the second substrate and having a second polarization axis perpendicular or parallel to the first polarization axis, an LC layer filled between the upper plate and the lower plate, and an LC driving power supply connected between the first electrode layer and the second electrode layer and configured to selectively provide an LC driving voltage to the LC layer. The LC layer has a first arrangement in which a polarization direction of incident light is changed by a preset angle in an entire region of the LC layer when the LC driving voltage is not applied, or a second arrangement in which the polarization direction of the incident light is maintained in at least partial region of the LC layer, to which the LC driving voltage is applied, when the LC driving voltage is applied. The first polarizing film includes an absorptive polarizing film, and the second polarizing film includes a reflective polarizing film.