Cholesteric Liquid Crystal Display Panel Crosstalk Reduction
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Solution Overview
Problem
Current display technologies, such as Micro-LED and Mini-LED, face significant crosstalk issues due to lateral light emission from LEDs, which affects color accuracy and efficiency, particularly when using blue light with color conversion technology, leading to reduced luminous utilization and increased costs.
Innovation Solution
The implementation of cholesteric liquid crystals with different chiral rotation directions between adjacent pixels, utilizing circular dichroism to selectively reflect or transmit light, allowing one pixel to pass through while blocking light from adjacent pixels, thereby reducing crosstalk through the use of photo-isomerizable chiral compounds and local photoisomerization and thermal polymerization methods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If black glue is applied to reduce crosstalk, then crosstalk is reduced, but luminous utilization rate decreases due to light absorption
Solution Approach 1:
The patent applies different chiral rotation directions to different liquid crystal cells corresponding to adjacent pixels. Each liquid crystal cell is configured with a specific chiral rotation direction that allows it to selectively transmit or reflect light based on its local pixel requirements, thereby reducing crosstalk without broadly absorbing light across the entire display.
Solution Approach 2:
The patent changes the optical parameters of the liquid crystal cells by controlling the chiral rotation direction of the liquid crystals in each cell. By adjusting this parameter, the cells can dynamically control light transmission and reflection properties to reduce crosstalk while maintaining luminous efficiency.
2Object-affected harmful factors
If white glue is applied to reduce crosstalk, then crosstalk is slightly reduced, but blue light absorption is insufficient leading to limited effectiveness
Solution Approach 1:
The patent implements local quality control by assigning specific chiral rotation directions to liquid crystal cells based on their position and function. This localized configuration enables precise control over light interaction at each pixel level, achieving effective crosstalk reduction without relying on uniform glue application.
Solution Approach 2:
The patent replaces the mechanical/chemical approach of using glue (black or white) with an optical field-based solution using liquid crystals. The liquid crystal cells utilize electro-optic effects to control light transmission and reflection, substituting passive material absorption with active optical modulation.
3Ease of manufacture
If blue light source with color conversion technology is used, then cost is reduced and process difficulty is decreased, but lateral light emission causes serious crosstalk between adjacent pixels
Solution Approach 1:
The patent introduces liquid crystal cells as intermediary elements between the blue light source and the color conversion layers. These intermediary cells act as optical modulators that control the direction and polarization of light before it reaches the color conversion layers, preventing lateral light emission from causing crosstalk.
Solution Approach 2:
The patent segments the display into individual liquid crystal cells, each independently controlling light for its corresponding pixel. This segmentation allows each cell to be optimized for its specific function, with chiral rotation directions configured to prevent light from entering adjacent pixel regions.
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 approach effectively reduces crosstalk between adjacent pixels, enhancing color accuracy and luminous efficiency by selectively managing light polarization, thus improving the overall performance and cost-effectiveness of display panels.
Implementation Method 1
utilizes circular dichroism of cholesteric liquid crystals, that is, a principle that light whose polarization direction is the same as a chiral rotation direction of the cholesteric liquid crystals is reflected, and light whose polarization direction is different from the chiral rotation direction of the cholesteric liquid crystals is transmitted
Implementation Method 2
The photo-isomerizable chiral compound includes an ultraviolet light photo-isomerizable chiral compound, and the ultraviolet light photo-isomerizable chiral compound includes a chiral diarylethylene or a chiral spirene monomer
Data Source
AI summary
The present invention discloses a display panel and a manufacturing method thereof. The display panel includes a plurality of liquid crystal cells, each of the plurality of liquid crystal cells includes cholesteric liquid crystals, and a chiral rotation direction of the cholesteric liquid crystals in one of the plurality of liquid crystal cells is opposite to a chiral rotation direction of the cholesteric liquid crystals in its adjacent ones of the liquid crystal cells, so that the cholesteric liquid crystals films with different rotation directions are designed between adjacent pixels, and one of any two adjacent pixels allows light to pass through, and another one of the two adjacent pixels blocks the light from passing through and reflects the light back into the display device, thereby achieving an object of reducing crosstalk.