Stacked Polymer Dispersed Liquid Crystal Layers for Low Voltage Display
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Solution Overview
Problem
Display devices using polymer dispersed liquid crystal layers require high voltage for operation, which necessitates the use of high-voltage drivers, and reducing the thickness of these layers to lower the voltage risks decreasing scattering brightness.
Innovation Solution
The implementation of a display device configuration with two stacked display panels, each having a polymer dispersed liquid crystal layer, where the thickness of these layers is maintained at 2 μm or less, allowing for lower voltage operation while minimizing the decrease in scattering brightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If the thickness of the polymer dispersed liquid crystal layer is reduced to lower the operating voltage, then the voltage requirement decreases, but the scattering brightness decreases
Solution Approach 1:
The invention divides a single thick liquid crystal layer into multiple thin layers (first, second, and third polymer dispersed liquid crystal layers) stacked in the thickness direction. Each layer has a thickness of 2 μm or less, allowing low-voltage operation. The segmented structure maintains sufficient scattering brightness through the cumulative effect of multiple layers while enabling operation at reduced voltage levels without requiring high-voltage drivers.
2Illumination intensity
If multiple display panels are stacked to maintain scattering brightness with thin layers, then the scattering brightness is maintained, but the device complexity increases
Solution Approach 1:
The invention merges multiple polymer dispersed liquid crystal layers (first, second, and third layers) into a single integrated display panel structure. The layers are stacked in the thickness direction with alignment films and substrates, creating a unified multi-layer configuration. This merging approach maintains scattering brightness equivalent to thicker single layers while avoiding the complexity of stacking separate display panels, as all layers function within one integrated panel architecture.
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 enables the display device to operate at lower voltages without the need for high-voltage drivers while maintaining sufficient scattering brightness, effectively addressing the trade-off between voltage and brightness.
Implementation Method 1
a display device using a polymer dispersed liquid crystal that can switch between a scattering state, in which incident light is scattered, and a transmission state, in which incident light is transmitted
Data Source
AI summary
According to one embodiment, a display device includes a first display panel, a second display panel, and a first light source, and the first display panel and the second display panel are disposed in contact with each other, the first polymer dispersed liquid crystal layer is provided between the first alignment film and the second alignment film, the second polymer dispersed liquid crystal layer is provided between the third alignment film and the fourth alignment film, a first thickness between the first alignment film and the second alignment film, and a second thickness between the third alignment film and the fourth alignment film are each 2 μm or less.