Liquid Crystal Display Switching Cell Polarization Rotation
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Solution Overview
Problem
Liquid crystal display apparatuses face challenges in achieving high visibility and efficient power consumption across varying brightness environments, as traditional reflective and transmissive displays either suffer from poor brightness in dark environments or increased power consumption in bright environments.
Innovation Solution
A liquid crystal display apparatus is designed with a switching cell and polarizing plates that can switch between transmissive and reflective modes by rotating the plane of polarization, allowing the apparatus to function as a transmissive display in dark environments and a reflective display in bright environments, thereby optimizing visibility and reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If transmissive display is used in dark environment, then visibility is improved, but power consumption increases when surface light source emits light brighter than ambient light
Solution Approach 1:
The patent implements dynamic switching between transmissive and reflective display modes based on ambient light conditions. A light sensor detects ambient brightness and controls a switching mechanism that reconfigures the optical path, allowing the display to adapt its illumination mode in real-time to optimize both visibility and power consumption.
Solution Approach 2:
The patent changes the optical configuration parameters by switching between two distinct display modes. In transmissive mode, the surface light source is activated for dark environments; in reflective mode, the surface light source is deactivated and ambient light is utilized for bright environments, thereby adjusting the system's energy consumption characteristics according to environmental conditions.
2Illumination intensity
If reflective display is used in bright environment, then visibility is improved, but power consumption is reduced, however in dark environment the reflective display suffers shortage in brightness
Solution Approach 1:
The system dynamically adapts its display mode based on ambient light levels detected by a sensor. When ambient light is sufficient, the system switches to reflective mode for energy efficiency. When ambient light is insufficient, the system transitions to transmissive mode to ensure adequate brightness, thus dynamically optimizing the trade-off between brightness and power consumption.
Solution Approach 2:
The patent creates a universal display system that can operate effectively in both bright and dark environments by integrating two display schemes. The display apparatus universally supports both reflective and transmissive modes, eliminating the limitation of dedicated single-mode displays and enabling adaptability across varying environmental conditions.
3Adaptability or versatility
If a reflective/transmissive liquid crystal display apparatus is designed to function as both reflective and transmissive display, then versatility is improved, but display performance deteriorates compared to dedicated reflective or transmissive display
Solution Approach 1:
The patent segments the display functionality into two distinct operational modes with dedicated optical paths. The switching mechanism cleanly separates the reflective and transmissive display functions, allowing each mode to operate with optimized performance characteristics similar to dedicated single-mode displays, thereby resolving the performance degradation issue while maintaining versatility.
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 apparatus achieves high display performance and reduced power consumption by seamlessly switching between modes, ensuring high-quality images in any brightness environment without the limitations of traditional reflective or transmissive displays.
Implementation Method 1
a switching cell arranged on a side of the first reflective polarizing plate opposite to the second polarizing plate, wherein the switching cell is configured to rotate a plane of polarization of light passing through the switching cell
Data Source
AI summary
A liquid crystal display apparatus includes a first polarizing plate, a liquid crystal display cell, a second polarizing plate, a switching cell, a first reflective polarizing plate, and a surface light source, which are arranged in this order. The apparatus further includes a control driving unit to switch the switching cell between a first and second state. In the first state, plane of polarization of polarized light emitted by the surface light source and transmitted through the first reflective polarizing plate and the switching cell is coincident with a transmissive axis of the second polarizing plate. In the second state, a plane of polarization of the polarized light input to the liquid crystal display cell from the side of the first polarizing plate and transmitted through the second polarizing plate and the switching cell is coincident with a reflective axis of the first reflective polarizing plate.