Transflective LCD with Opposite Twist LC Layers
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Solution Overview
Problem
Transmissive LCDs consume high power and generate excessive heat, while reflective LCDs are limited by ambient light conditions, making them unsuitable for outdoor applications where high brightness and readability are required.
Innovation Solution
A transflective liquid crystal display with twisted nematic liquid crystal layers having opposite twist directions, a reflector for the reflective region, and a double cell structure to optimize light efficiency and contrast in both reflective and transmissive modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If transmissive LCD uses backlight to provide illumination, then illumination intensity is improved, but use of energy increases and heat generation increases
Solution Approach 1:
The pixel is divided into reflective and transmissive sub-pixels. The transmissive sub-pixel uses backlight for illumination, while the reflective sub-pixel uses ambient light. This segmentation allows the display to use backlight only where necessary, reducing overall power consumption while maintaining brightness where needed.
Solution Approach 2:
The display combines both transmissive and reflective modes in a single device, allowing it to function effectively in various lighting conditions. The transflective LCD can operate in transmission mode using backlight, in reflection mode using ambient light, or in a combined mode, providing universal adaptability to different environments.
2Use of energy by moving object
If reflective LCD uses ambient light for imaging, then use of energy is reduced, but illumination intensity decreases and adaptability worsens
Solution Approach 1:
The display combines both transmissive and reflective modes in a single device, allowing it to function effectively in various lighting conditions. The transflective LCD can operate in transmission mode using backlight, in reflection mode using ambient light, or in a combined mode, providing universal adaptability to different environments.
Solution Approach 2:
The pixel is divided into reflective and transmissive sub-pixels. The reflective sub-pixel uses ambient light to save power, while the transmissive sub-pixel provides backlight support. This segmentation enables the display to adapt to different ambient light conditions while maintaining energy efficiency.
3Illumination intensity
If high brightness LCD uses high power backlight, then illumination intensity is improved, but use of energy increases and temperature increases
Solution Approach 1:
The pixel is divided into reflective and transmissive sub-pixels. The transmissive sub-pixel uses backlight for illumination, while the reflective sub-pixel uses ambient light. This segmentation allows the display to use backlight only where necessary, reducing overall power consumption and heat generation while maintaining brightness where needed.
4Illumination intensity
If transmissive sub-pixel allows light from backlight to pass through, then illumination intensity is improved, but use of energy increases
Solution Approach 1:
Different parts of the pixel have different optical properties. The transmissive sub-pixel is designed to transmit backlight efficiently, while the reflective sub-pixel is designed to reflect ambient light. This local differentiation optimizes light usage in each region, reducing overall energy loss.
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 provides improved contrast, wide viewing angles, and efficient light usage in various ambient light conditions, enabling effective outdoor use with reduced power consumption and heat generation.
Implementation Method 1
two twisted nematic liquid crystal layers between said first and second polarizers wherein said twisted nematic liquid crystal layers have opposite twist directions to each other
Implementation Method 2
a first polarizer; a second polarizer opposing the first polarizer
Implementation Method 3
a reflector for reflecting light passing through the reflective region of the display
Data Source
AI summary
A transflective liquid crystal display having at least one reflective region 122 and at least one transmissive region 121. The display comprises a first polarizer 5, a second polarizer 100 opposing the first polarizer 5, two twisted nematic liquid crystal layers 30, 60 between said first and second polarizers 5, 100 and a reflector 110 for reflecting light passing though the reflective region 122 of the display. The twisted nematic liquid crystal layers 30, 60 have opposite twist directions to each other. The second twisted nematic liquid crystal layer 60 improves the contrast of the display. The display may have a double cell arrangement, in which case there may be a single cell gap or a double cell gap. Alternatively, the display may have a single cell arrangement in which case the second twisted nematic liquid crystal layer is a temperature dependent retardation film 65.