Color Sequential Display Device with PNLC and Quantum Materials
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Solution Overview
Problem
Current liquid crystal display (LCD) technologies suffer from low optical efficiency, resulting in inadequate brightness and contrast due to inefficient light transmission through the LCD stack.
Innovation Solution
A color sequential display device structure incorporating a polymer networked liquid crystal (PNLC) or polymer dispersed liquid crystal (PDLC) layer with quantum materials and a specific electrode configuration, along with a blue light source, to enhance light transmission and control alignment of liquid crystal molecules for improved optical efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional LCD stack structure with color filters is used, then device complexity is maintained at acceptable level, but optical efficiency deteriorates to only 3-5%
Solution Approach 1:
The invention divides the display into multiple sub-pixels (first sub-pixel with blue color filter, second sub-pixel with yellow color filter) within each pixel. By segmenting the pixel structure and using sequential coloring with PNLC/PDLC layer control, the system achieves high optical efficiency (45%) while maintaining manageable device complexity through modular sub-pixel design.
Solution Approach 2:
The invention employs periodic action by alternating the optical state of the PNLC/PDLC layer between different half-frames. In odd half-frames, the first sub-pixel is activated; in even half-frames, the second sub-pixel is activated. This temporal segmentation with periodic switching enables high optical efficiency while avoiding the need for complex simultaneous multi-color filtering structures.
2Illumination intensity
If optical efficiency is improved to 45% for high brightness and contrast, then brightness and contrast are enhanced, but device structure becomes more complex with additional layers
Solution Approach 1:
The invention merges the functions of color filtering and light modulation into a unified structure. The PNLC/PDLC layer serves dual purposes: controlling light transmission for brightness enhancement and enabling sequential color display by alternating sub-pixel activation. This merging eliminates the need for separate complex color generation mechanisms, achieving 45% optical efficiency with relatively simple added structure.
Solution Approach 2:
The PNLC/PDLC layer acts as a universal component that performs multiple functions: it controls light transmission intensity for brightness enhancement, enables sequential color switching by alternating sub-pixel activation, and works with both blue and yellow color filters. This multi-functionality achieves high brightness and contrast without proportionally increasing device complexity.
3Loss of energy
If sequential color display with PNLC/PDLC layer is implemented, then optical efficiency reaches 45%, but manufacturing precision requirements increase
Solution Approach 1:
The invention extracts the color generation function from simultaneous multi-color filters and relocates it to sequential temporal display through the PNLC/PDLC layer. By taking out the need for precise spatial alignment of multiple color filters and replacing it with temporal switching, the manufacturing precision requirement is reduced while maintaining 45% optical efficiency through simpler alignment tolerances for sub-pixels.
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 achieves an optical efficiency of about 45% for blue, red, and green lights, significantly improving brightness and contrast in LCD displays.
Implementation Method 1
a quantum material layer disposed between the third substrate and the at least one first transparent electrode, wherein the quantum material layer includes a red quantum material (R-quantum material) and a green quantum material (G-quantum material)
Implementation Method 2
the first transparent electrode and the second transparent electrode corresponding to each G-quantum material are provided with a voltage difference to form an electric field to control alignment of PNLC or PDLC molecules of the PNLC or PDLC layer
Implementation Method 3
the PNLC or PDLC molecules aligned to the G-quantum material are configured to be turned on to switch to a transparent state, and the PNLC or PDLC molecules aligned to the R-quantum material are randomly arranged to scatter and diffuse the blue light emitted by the blue light source
Data Source
AI summary
A display cell structure includes a first structure and a second structure disposed on the first structure. In the first structure, a liquid crystal layer is disposed between a first substrate and a second substrate, defining multiple pixels. A color filter layer is disposed on the first substrate. In each pixel, the color filter layer includes a blue (B) color filter in a first sub-pixel and a yellow (Y) color filter in a second sub-pixel. In the second structure, a polymer networked liquid crystal (PNLC) or polymer dispersed liquid crystal (PDLC) layer is disposed between a third substrate and a fourth substrate. Multiple first and second transparent electrodes are correspondingly disposed on the third and fourth substrates. A quantum material layer is disposed between the third substrate and the first transparent electrodes. The quantum material layer includes a red quantum material (R-quantum material) and a green quantum material (G-quantum material).