Multi-Composition Liquid Crystal Pixel for Wide Temperature Operation
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Solution Overview
Problem
Liquid crystal display devices face challenges in maintaining stable display quality across varying temperature environments due to the temperature-dependent properties of liquid crystals, leading to degraded contrast and increased power consumption from constant heater use in low-temperature conditions.
Innovation Solution
A liquid crystal display element with at least two types of liquid crystal compositions, each exhibiting a liquid crystal phase in different temperature ranges, are sealed and isolated within each pixel, and a temperature sensor-driven liquid crystal drive circuit controls the compositions based on environmental temperature to maintain optimal performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single liquid crystal composition is used in the display element, then the device structure is simple, but the display quality is degraded in low-temperature environments due to increased viscosity and reduced response speed
Solution Approach 1:
The liquid crystal composition is segmented into multiple distinct compositions (first and second liquid crystal compositions) with different liquid crystal phases at the same temperature. Each composition is sealed in separate sealed areas within the same pixel, allowing independent operation at different temperature ranges. This segmentation enables the display element to maintain reliable display quality across wide temperature variations without requiring complex heating systems.
2Temperature
If at least two types of liquid crystal compositions are mixed together to increase temperature range, then the temperature range is extended, but the temperature characteristics of each liquid crystal composition are not maintained
Solution Approach 1:
Instead of mixing liquid crystal compositions, the patent segments them into separate sealed areas within each pixel. This physical separation preserves the unique temperature characteristics of each composition while still achieving a wide overall temperature range. The first liquid crystal composition operates in its liquid crystal phase at lower temperatures, while the second composition operates at higher temperatures, maintaining stable display quality across the combined temperature range without compositional interference.
Solution Approach 2:
Different sealed areas within the same pixel have different local qualities (different liquid crystal compositions with different phase transition temperatures). This allows each local region to be optimized for specific temperature conditions, with the first composition optimized for lower temperatures and the second for higher temperatures, thereby maintaining stable temperature characteristics across the entire temperature range.
3Reliability
If a heater is incorporated in the liquid crystal display element to control temperature, then display quality is maintained in low-temperature environments, but power consumption increases due to constant energization
Solution Approach 1:
The display element uses itself to solve the temperature control problem by incorporating multiple liquid crystal compositions with different phase transition temperatures. The system automatically adapts to ambient temperature changes without requiring external heating, as the appropriate composition naturally operates in its liquid crystal phase at each temperature range. This eliminates the need for continuous heater energization and significantly reduces power consumption.
Solution Approach 2:
The patent changes the physical parameter (liquid crystal phase state) of different compositions based on temperature. At lower temperatures, the first composition remains in liquid crystal phase while the second becomes isotropic. At higher temperatures, the first becomes isotropic while the second remains in liquid crystal phase. This automatic parameter change based on temperature eliminates the need for active heating control.
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 solution allows for stable display quality across a wide temperature range without constant heating, reducing power consumption and ensuring reliable operation in diverse environments.
Implementation Method 1
at least two types of liquid crystal compositions which exhibit liquid crystal phase in different temperature ranges are contained within each one pixel
Data Source
AI summary
A liquid crystal display element includes a liquid crystal composition sandwiched between substrates, wherein at least two types of liquid crystal compositions which exhibit liquid crystal phase in different temperature ranges are contained within each one pixel, and each of the at least two types of liquid crystal compositions is sealed and isolated within each pixel.