High-Resistivity Alignment Film Reduces Flicker in LCDs
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Solution Overview
Problem
Liquid crystal display devices face challenges in reducing power consumption while minimizing flicker, especially when using low-frequency driving, due to impedance mismatch between the alignment film and liquid crystal layer, which is exacerbated by high-temperature and high-humidity conditions and continuous illumination.
Innovation Solution
A liquid crystal display device with an alignment film having a resistivity of 5×10^14 Ω·cm or more and a liquid crystal layer with a resistivity of 1×10^13 Ω·cm or more, both formed of materials that do not produce conductive carriers under light exposure, is used to maintain voltage stability and reduce flicker during low-frequency driving.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by stationary object
If low-frequency driving is used to reduce circuit power consumption, then power consumption is reduced, but flicker occurs due to impedance mismatch between alignment film and liquid crystal layer
Solution Approach 1:
The patent changes the resistivity parameter of the alignment film to 5×10^14 Ω·cm or more, which is higher than conventional values. This parameter change creates better impedance matching with the liquid crystal layer, reducing voltage decay and flicker during low-frequency driving while maintaining reduced power consumption
Solution Approach 2:
The patent uses composite material structures including the alignment film with specific resistivity properties combined with the liquid crystal layer having resistivity of 1×10^13 Ω·cm or more. This composite approach optimizes the interaction between layers to minimize impedance mismatch effects during low-frequency operation
2Use of energy by stationary object
If low-frequency driving is used to reduce circuit power consumption, then power consumption is reduced, but display quality deteriorates due to voltage decay
Solution Approach 1:
By increasing the alignment film resistivity to 5×10^14 Ω·cm or more, the voltage decay during the longer refresh intervals of low-frequency driving is significantly reduced. This maintains display quality with uniform brightness while achieving reduced power consumption
3Ease of manufacture
If conventional alignment film resistivity is used, then manufacturing is easier, but impedance mismatch is exacerbated by high-temperature and high-humidity conditions
Solution Approach 1:
The patent specifies an alignment film resistivity of 5×10^14 Ω·cm or more, which provides better impedance matching stability under high-temperature and high-humidity conditions. This parameter specification ensures reliable operation across different environmental conditions while remaining compatible with conventional manufacturing processes
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 effectively reduces flicker and maintains display quality even under high-temperature and high-humidity conditions, ensuring stable voltage holding and uniform brightness during low-frequency operation.
Implementation Method 1
both formed of materials that do not produce conductive carriers under light exposure
Data Source
AI summary
According to one embodiment, a liquid crystal display device includes a liquid crystal display panel which includes a pixel electrode, a liquid crystal layer and an alignment film, and a driver. The driver drives the pixel electrode at a drive frequency of 1 to 20 Hz. The alignment film has a resistivity of 5×1014 Ω·cm or more.