IPS LCD Light Blocking Line for Viewing Angle Cross Talk
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Solution Overview
Problem
In-plane switching mode liquid crystal display devices suffer from Viewing Angle Cross Talk (VAC) deficiency due to misalignment between electrodes and substrates, leading to light leakage at specific viewing angles, which degrades image quality.
Innovation Solution
A light blocking line is formed between the data line and the common electrode to prevent light leakage, and at least one of the common or pixel electrodes is made of transparent conductive material to improve the aperture ratio and generate an in-plane electric field.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a light blocking line is formed between the data line and common electrode, then light leakage is prevented and VAC deficiency is reduced, but device complexity and manufacturing steps increase
Solution Approach 1:
The patent divides the electrode structure into separate components: the common electrode, the data line, and an additional light blocking line. This segmentation allows each component to perform its specific function - the common electrode for electrical function, the data line for signal transmission, and the light blocking line for preventing light leakage, thereby resolving the contradiction between reliability and complexity.
Solution Approach 2:
The light blocking line acts as an intermediary element between the data line and common electrode. It mediates the light leakage problem by blocking stray light in the gap between these two components, preventing VAC deficiency without requiring fundamental changes to the electrode structure, thus improving reliability with minimal increase in complexity.
2Area of stationary object
If transparent conductive material is used for common or pixel electrodes, then aperture ratio is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent applies different material properties to different parts of the electrode system. Transparent conductive material is used specifically for the common electrode and/or pixel electrode where light transmission is critical, while other components may use traditional materials. This local optimization improves aperture ratio without requiring all components to meet stringent manufacturing precision requirements.
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 light blocking line effectively reduces VAC deficiency by blocking light leakage at specific viewing angles, while the use of transparent conductive materials enhances image quality and aperture ratio, improving the display's overall performance.
Implementation Method 1
a light blocking line formed to cover space between the data line and the common electrode adjacent to the data line
Implementation Method 2
at least one pair of a pixel electrode and a common electrode arranged toward the first direction and generating an in plane electric field in the pixel
Implementation Method 3
When an electric field is applied between the pixel electrode and the common electrode, the liquid crystal material rotates due to dielectric anisotropy
Data Source
AI summary
An in-plane switching mode liquid crystal display device includes a first substrate and a second substrate, a gate line and a data line crossing each other on the first substrate to define a pixel region, a switching device at a crossing of the gate line and the data line, a pixel electrode and a common electrode on the first substrate for generating an in-plane electric field in the pixel region, a black matrix, a light blocking line, the light blocking line being below the black matrix and above the data line, the light blocking line covering a gap between the data line and the common electrode adjacent to the data line, and a liquid crystal layer formed between the first and second substrates.