Multi-Layer Liquid Crystal Display with High Extinction Polarizers
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Solution Overview
Problem
Conventional liquid-crystal display devices have limitations in achieving optimal contrast and luminance due to inadequate polarization control, leading to subpar performance in certain applications.
Innovation Solution
The display device incorporates a backlight structure, two liquid-crystal layers, and multiple polarized layers with specific extinction ratios to control light polarization, allowing for improved contrast and luminance by adjusting the orientation of liquid-crystal molecules and strategically placing polarized layers between the backlight and liquid-crystal layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional liquid-crystal display devices use standard polarization control, then the device structure remains simple, but the contrast and luminance performance are insufficient
Solution Approach 1:
The display device is divided into multiple functional layers including first and second liquid-crystal layers, multiple polarized layers (first, second, third, fourth), color filters, and electrode structures. Each layer performs a specific function in the polarization control chain, allowing independent optimization of luminance and contrast without requiring complete redesign of the entire system.
Solution Approach 2:
The patent introduces multiple polarized layers arranged in different orientations and positions within the display structure. The first and second polarized layers are disposed at different positions with their polarization axes extending in different directions, creating a multi-dimensional polarization control system that enhances contrast ratio while maintaining luminance through strategic layer placement.
2Manufacturing precision
If multiple polarized layers with high extinction ratios are added to improve contrast, then contrast ratio improves, but manufacturing complexity and cost increase
Solution Approach 1:
The patent specifies that the extinction ratio of the polarized layers is in a range from about 500 to 5000, optimizing the balance between contrast performance and manufacturability. The thicknesses of the liquid-crystal layers and polarized layers are carefully controlled within specific ranges to achieve the desired optical performance without requiring excessively tight manufacturing tolerances that would drive up costs.
Solution Approach 2:
The display device employs a composite structure combining multiple types of layers: liquid-crystal materials, polarized layers, color filters, and electrode structures. This composite approach allows each material to be optimized for its specific function while working together to achieve high contrast ratio, with the first and second liquid-crystal layers having different molecular orientations to enhance overall performance.
3Manufacturing precision
If liquid-crystal molecule orientation is adjusted to control light transmission, then contrast improves, but the response time and viewing angle may be affected
Solution Approach 1:
The patent employs two liquid-crystal layers with different molecular orientations that can be independently controlled by respective electrode structures. This dynamic configuration allows the display to adjust light transmission characteristics in real-time, optimizing contrast ratio while maintaining fast response times through the coordinated action of multiple liquid-crystal layers with different response characteristics.
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
This configuration enhances the display device's luminance and contrast by optimizing light transmission and blocking unwanted polarized components, meeting design requirements while reducing manufacturing costs.
Implementation Method 1
The polarized layers are located between the backlight structure and the first liquid-crystal layer, between the first liquid-crystal layer and the second liquid-crystal layer, and located on the second liquid-crystal layer. The extinction ratio of the polarizers is in a range from about 5000 to 50000.
Implementation Method 2
Applying voltage to a liquid-crystal layer changes the orientation or tilt angle of the liquid-crystal molecules in the liquid-crystal layer, which changes the amount of light that can penetrate the picture displayed by the liquid-crystal display device.
Data Source
AI summary
A display device includes a backlight structure, a first liquid-crystal layer, a second liquid-crystal layer, and polarized layers. The first liquid-crystal layer is disposed on the backlight structure. The second liquid-crystal layer is disposed on the first liquid-crystal layer. The polarized layers are located between the backlight structure and the first liquid-crystal layer, between the first liquid-crystal layer and the second liquid-crystal layer, and located on the second liquid-crystal layer. The extinction ratio of the polarized layers is in a range from about 5000 to 50000.