Liquid Crystal Display Dummy Pixel Voltage Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Liquid crystal display devices suffer from defective indications and light leakage due to the generation of reverse twisted domains in the dummy pixel region, which can propagate to the display pixel region, affecting display quality.
Innovation Solution
Applying an optimum voltage to the dummy pixel region that is lower than the upper-limit voltage for reverse twisted domain generation and higher than the lower-limit voltage for light leakage, within a specific range determined by voltage drop and video signal voltage considerations, to prevent reverse twisted domains and light leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the maximum value of video signal voltage is applied to the dummy pixel electrode, then light leakage in the boundary area is prevented, but reverse twisted domains are generated in the dummy pixel region which propagate to the display pixel region causing defective indication
Solution Approach 1:
The patent applies a voltage to the dummy pixel electrode that is carefully controlled within a specific range: not exceeding the maximum video signal voltage (to prevent reverse twisted domains) but sufficiently high to maintain optical properties at the boundary. This parameter optimization resolves the contradiction by finding the precise voltage level that prevents both light leakage and reverse twisted domain generation.
2Object-affected harmful factors
If a high voltage is applied to the liquid crystal layer in the dummy pixel region, then the liquid crystal molecules rise up prominently which prevents light leakage, but reverse twisted domains are more likely to be generated
Solution Approach 1:
The patent optimizes the voltage parameter applied to the dummy pixel electrode, setting it to a specific level that achieves sufficient liquid crystal molecule alignment to prevent light leakage, while remaining below the threshold that would cause reverse twisted domains. This precise parameter control maintains display quality while preventing optical defects.
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 improves picture quality by preventing defective indications and optical property dispersion between the display and dummy pixel regions, enhancing the overall performance of liquid crystal display devices.
Implementation Method 1
a transverse electric field is generated in the liquid crystal layer 33 in a boundary area 35 between the dummy pixel region 2 and the display pixel region 1
Implementation Method 2
liquid crystal molecules are in a laid position (that is, facing the sideways)
Data Source
AI summary
An object is to prevent a defective indication caused by a reverse twisted domain generated from the dummy pixel region which is provided in the periphery of a display pixel region. By setting a signal voltage to be applied to the pixels of the dummy pixel region to be lower than the maximum value of a video signal voltage which is applied to the display pixel region and also setting it to be in a level by which a defective indication is not caused due to a traverse electric field between the neighboring dummy pixel region and the display pixel region, generation of the reverse twisted domain within the dummy pixel region can be suppressed. Thereby, the defective indication caused by the reverse twist can be prevented.