Liquid Crystal Display Additive for Residual Image Prevention
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Solution Overview
Problem
Residual images and deteriorated picture quality in LCD devices due to reactions between liquid crystal molecules and impurities, such as intermediate products and components of the device, which alter the properties of the liquid crystal molecules.
Innovation Solution
Incorporating an additive into the liquid crystal layer that reacts with impurities before affecting the liquid crystal molecules, thereby preventing changes in their properties and reducing residual images, with the additive being preferably between 50 ppm and 2000 ppm.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If liquid crystal layer is used without additive, then device complexity is reduced, but residual images occur due to reactions between liquid crystal molecules and impurities
Solution Approach 1:
An additive is introduced as an intermediary substance in the liquid crystal layer that preferentially reacts with impurities (such as intermediate products and device components) before they can react with liquid crystal molecules. This mediator approach prevents harmful reactions while maintaining overall system simplicity
Solution Approach 2:
The additive performs preliminary action by reacting with impurities before they affect the liquid crystal molecules. This preemptive reaction prevents property changes in liquid crystal molecules that would lead to residual images and picture quality deterioration
2Reliability
If additive concentration is increased, then residual images are reduced, but liquid crystal layer properties may be altered
Solution Approach 1:
The additive concentration is optimized within a specific range (50-2000 ppm) to achieve effective impurity reaction while maintaining liquid crystal layer properties. This parameter optimization balances residual image prevention with composition stability
Solution Approach 2:
The additive is designed to replicate the protective function needed without disrupting the overall liquid crystal structure. It copies the desirable property of impurity reaction while avoiding the harmful effect of property alteration in the main liquid crystal molecules
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 additive effectively minimizes residual images and edge stains, improving the overall picture quality of the LCD device while ensuring the liquid crystal layer remains functional at extreme temperatures.
Implementation Method 1
an additive for preventing a reaction between the liquid crystal molecules and impurities
Implementation Method 2
According to whether or not an electric field is applied, light transmittance is controlled by alignment of the liquid crystal layer
Data Source
AI summary
Disclosed is a liquid crystal display device having an improved picture quality by overcoming a problem of residual images through the use of a liquid crystal layer including an additive therein. The liquid crystal display device may include a first substrate, a second substrate facing the first substrate, and the liquid crystal layer between the first and second substrates, wherein the liquid crystal layer includes liquid crystal molecules, and the additive for preventing a reaction between the liquid crystal molecules and impurities.