Transmissive LCD with Scattering and Reflective Polarizers
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Solution Overview
Problem
Semi-reflecting and semi-transmitting liquid crystal displays have complex manufacturing processes, high developing costs, and long cycles, with reduced transmittance and reflectivity, limiting their brightness and outdoor application efficiency.
Innovation Solution
A display screen comprising a transmissive liquid crystal panel with polarizers, a scattering layer, and a reflective polarizer, allowing for automatic switching between transmissive and reflective modes based on ambient light, using a microcontroller unit and light detection system to optimize backlight usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If semi-reflecting and semi-transmitting liquid crystal display is used, then the display can be applied in outdoor scenarios, but the manufacturing process becomes complicated and the developing cost increases
Solution Approach 1:
The patent divides the display into distinct functional regions: a first polarizer layer, a liquid crystal layer, a scattering layer, and a second polarizer layer. Each layer performs a specific optical function, allowing the system to achieve both transmissive and reflective modes through layered segmentation rather than complex integrated structures.
Solution Approach 2:
The scattering layer acts as an intermediary between the liquid crystal layer and the second polarizer, enabling the conversion of transmitted light into reflected light by scattering. This intermediary component simplifies the overall structure by using a straightforward light scattering mechanism instead of complex semi-reflecting and semi-transmitting electrode patterns.
2Adaptability or versatility
If semi-reflecting and semi-transmitting liquid crystal display is used, then the display can be applied in outdoor scenarios, but the transmittance and reflectivity are significantly reduced
Solution Approach 1:
The patent changes the optical parameters of the display system by using a scattering layer with specific scattering properties and polarizers with optimized transmission axes. This allows the system to maintain high transmittance in transmissive mode and high reflectivity in reflective mode, thereby preserving display brightness across different operating conditions.
Solution Approach 2:
The display structure combines multiple optical materials with complementary properties: the liquid crystal material for polarization control, the scattering layer for light direction control, and the polarizer materials for polarization filtering. This composite structure achieves superior optical performance compared to single-material approaches.
3Adaptability or versatility
If semi-reflecting and semi-transmitting liquid crystal display is used, then the display can be applied in outdoor scenarios, but the developing cycle becomes long
Solution Approach 1:
The patent employs commercially available off-the-shelf components such as standard liquid crystal panels, conventional polarizers, and readily manufacturable scattering layers. This approach avoids the need for custom-developed semi-reflecting and semi-transmitting technologies, significantly shortening the development cycle and reducing technical risks.
4Use of energy by moving object
If backlight is turned off and ambient light is used as light source, then energy consumption is reduced and service life is elongated, but the display brightness is limited
Solution Approach 1:
The patent creates a dynamic display system that can switch between transmissive mode (backlight on) and reflective mode (backlight off) based on ambient lighting conditions. This dynamic adaptability allows the display to optimize energy consumption during daytime when ambient light is abundant, while maintaining brightness through the scattering layer's ability to efficiently redirect ambient light.
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 solution improves brightness and manufacturing simplicity, enabling energy-saving and emission reduction while maintaining high transmittance and reflectivity, suitable for various outdoor illuminations and reducing the complexity of the manufacturing process.
Implementation Method 1
a scattering layer, arranged between the first polarizer and the transmissive liquid crystal panel, and/or arranged between the second polarizer and the transmissive liquid crystal panel
Implementation Method 2
a reflective polarizer, the reflective polarizer being arranged between the transmissive liquid crystal panel and the second polarizer
Implementation Method 3
a first polarizer, arranged at a displaying side of the transmissive liquid crystal panel; a second polarizer, arranged at the non-displaying side of the transmissive liquid crystal panel
Data Source
AI summary
Disclosed are a display screen and a display apparatus, comprising: a transmissive liquid crystal panel comprising a displaying side and a non-displaying side arranged opposite to each other; a first polarizer arranged at the displaying side of the transmissive liquid crystal panel; a second polarizer arranged at the non-displaying side of the transmissive liquid crystal panel, a direction of a transmission axis of the first polarizer is perpendicular to that of the second polarizer; a scattering layer arranged between the transmissive liquid crystal panel and at least one of the first polarizer the second polarizer; a reflective polarizer arranged between the transmissive liquid crystal panel and the second polarizer. The disclosed display screen and the display apparatus have a relatively high transmittance and reflectivity, and can be used under different outdoor illuminations so as to realize environmentally friendly effects such as energy saving and emission reduction.