Electro-Optical Device Mirror Mode Switching
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Solution Overview
Problem
Large liquid crystal televisions with screens over 80 inches display a black screen when turned off, which can be intimidating and do not harmonize with other home appliances or furniture, and existing solutions for alternative uses of display screens when not displaying images are limited.
Innovation Solution
An electro-optical device with a transmission polarization axis conversion unit, absorption polarization unit, and reflective polarization unit that can switch between mirror and transparent modes by controlling the polarization direction of light, allowing the screen to function as a mirror or display images even when not actively showing content.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the liquid crystal television screen is turned off to save energy, then energy consumption is reduced, but the screen appears as a large black rectangle which is intimidating and does not harmonize with home interiors
Solution Approach 1:
The display device is designed to perform multiple functions: it can display images when needed and function as a mirror when not displaying images. This multi-functionality allows the screen to adapt to different usage scenarios and interior designs, transforming from a single-function display into a versatile component that serves both entertainment and decorative purposes
Solution Approach 2:
The device dynamically switches between two distinct states: a display state where images are shown and a mirror state where the screen reflects surrounding scenery. This dynamic transformation is controlled by adjusting the optical properties of the liquid crystal layer, allowing the screen to change its appearance and function based on operational requirements
2Adaptability or versatility
If the screen is designed to function as a mirror when off, then aesthetic adaptability to interior is improved, but device complexity increases due to additional optical components
Solution Approach 1:
The patent combines multiple optical components (liquid crystal layer, polarization units, reflective layer) into an integrated structure where the liquid crystal television screen itself serves as the mirror when not displaying images. This merging eliminates the need for separate mirror components and reduces overall system complexity while achieving the dual functionality
Solution Approach 2:
The display panel serves dual purposes: as an active display when images are shown and as a reflective mirror when not in use. This universal design allows the same physical structure to fulfill multiple functions, reducing the need for additional components and simplifying the overall device architecture
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 liquid crystal television screen to be used as a mirror or display images when not in use, providing design flexibility and reducing the intimidating black appearance, while maintaining image quality and compatibility with surroundings.
Implementation Method 1
a liquid crystal layer disposed between the first transparent electrode and the second transparent electrode, the transmission polarization axis conversion unit can switch between a first state and a second state
Implementation Method 2
an absorption polarization unit having transmission polarization axis in a first direction and having absorption polarization axis in a second direction orthogonal to the first direction
Implementation Method 3
a reflective polarization unit including a region having a transmission polarization axis in the first direction and a reflective polarization axis in the second direction
Data Source
AI summary
An electro-optical device includes a transmission polarization axis conversion unit having a first surface and a second surface, an absorption polarization unit having transmission polarization axis in a first direction and having absorption polarization axis in a second direction, and a reflective polarization unit including a region having a transmission polarization axis in the first direction and a reflective polarization axis in the second direction, and an opening. The transmission polarization axis conversion unit can switch a first/second state, the first state is an incident light entering the first surface from the absorption polarization unit is converted into a first outgoing light of linearly polarized light in the second direction, and the first outgoing light is emitted from the second surface, the second state is the incident light converted into a second outgoing light of linearly polarized light in the first direction and emitted from the second surface.