Reflective Polarizer Hinge for Electro-Optical Mode Switching
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Solution Overview
Problem
Liquid crystal display devices with a polarizer on the display surface face challenges in switching between viewing and mirror modes without display light, as existing solutions either block display light or fail to provide adequate visibility in mirror mode.
Innovation Solution
An electro-optical device with a biaxial hinge mechanism that allows the reflective polarizer module to pivot, adjusting the polarization axes relative to the polarizer, enabling seamless switching between viewing and mirror modes by changing the module's position between closed positions, ensuring efficient display light transmission or blocking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the polarization axis of the polarizer is disposed parallel to the polarization axis of the reflective polarizer, then the device can function as a mirror in mirror mode, but display light is transmitted through the reflective polarizer to cancel the reflected light, preventing proper display
Solution Approach 1:
The patent applies the dynamics principle by making the polarizer rotatable relative to the reflective polarizer. The polarizer can be rotated to change the angle between its polarization axis and the reflective polarizer's polarization axis, allowing the device to switch between viewing mode (parallel alignment) and mirror mode (perpendicular alignment). This dynamic adjustment resolves the contradiction by enabling both modes without fixed constraints.
Solution Approach 2:
The patent changes the angular parameter of the polarizer's polarization axis relative to the reflective polarizer. By adjusting this angle between 0 degrees (parallel) and 90 degrees (perpendicular), the device controls the transmission and reflection characteristics of light, enabling switching between viewing and mirror modes while managing display light cancellation.
2Adaptability or versatility
If the polarization axis of the polarizer is disposed perpendicular to the polarization axis of the reflective polarizer, then mirror mode is always realized, but display light cannot be transmitted through the reflective polarizer, preventing display functionality
Solution Approach 1:
The rotatable polarizer mechanism allows dynamic switching between perpendicular alignment (mirror mode) and parallel alignment (viewing mode). This resolves the contradiction by enabling the system to adapt its optical characteristics based on operational requirements, maintaining both mirror functionality and display capability without permanent compromise.
Solution Approach 2:
By changing the angular parameter of the polarizer from perpendicular (90 degrees) to parallel (0 degrees) alignment with the reflective polarizer, the system transitions between mirror mode and viewing mode. This parameter adjustment allows the display light to be transmitted when needed while maintaining mirror functionality when required.
3Adaptability or versatility
If display light is blocked to achieve mirror mode, then reflected light from ambient light is visible, but the auxiliary light source must be turned off, reducing operational flexibility
Solution Approach 1:
The patent extracts the light source control requirement from the mirror mode operation. By using the polarizer's angular alignment to block display light and enable mirror mode, the system eliminates the need to turn off the auxiliary light source. This resolves the contradiction by achieving mirror functionality through optical alignment rather than light source manipulation.
Solution Approach 2:
The rotatable polarizer acts as an intermediary element that controls light transmission and reflection. By adjusting the polarizer's angle, it mediates between display light and ambient light, enabling mirror mode without requiring auxiliary light source manipulation. This intermediary mechanism simplifies the overall device control.
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 easy switching between viewing and mirror modes irrespective of display light presence, optimizing visibility in both modes by adjusting the relative angles of the polarization axes, thus enhancing usability and visibility.
Implementation Method 1
The polarization axis of the polarizer and the polarization axis of the reflective polarizer each are set in a direction that is not parallel and perpendicular to the first axis
Data Source
AI summary
An electro-optical device that includes a first module, a plate-like second module, and a hinge portion. The first module is provided with an electro-optical panel having a polarizer. The electro-optical panel is disposed on a side of a display surface of the first module, on which surface an image is displayed. The second module is provided with a reflective polarizer and has at least a translucent portion in area that overlaps with the reflective polarizer in a direction perpendicular to the reflective polarizer. The hinge portion couples the first module to the second module. The hinge portion supports the second module so that the second module, when pivoted about a first axis parallel to the display surface, is allowed to be switched between a closed position in which the display surface is covered and an opened position in which the display surface is exposed to an outside, while the hinge portion pivotally supports the second module about a second axis perpendicular to the first axis and parallel to the reflective polarizer. The polarization axis of the polarizer and the polarization axis of the reflective polarizer each are set in a direction that is not parallel and perpendicular to the first axis.