Liquid Crystal Display Expanding Transmissive Area via Shielding Electrodes
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Solution Overview
Problem
Existing liquid crystal display devices using lateral electric fields face challenges in achieving high transmissivity and controlling electric field leakage, which affects display quality and viewing angle, due to issues with electric field shielding and alignment disorder near gate lines and source lines.
Innovation Solution
The liquid crystal display device incorporates a sub-common electrode that overlaps with the gate line to shield undesirable electric fields and uses multiple common electrodes with the same potential to create an equipotential surface, reducing electric field leakage and improving transmissivity by forming a horizontal electric field that aligns liquid crystal molecules effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a common electrode is formed to shield electric field from source line, then electric field leakage is reduced, but device complexity increases due to additional electrode structures
Solution Approach 1:
The patent combines the shielding function with the common electrode itself by forming the common electrode to extend along the source line, merging the shielding function with the existing common electrode structure rather than adding separate shielding electrodes
Solution Approach 2:
The common electrode serves multiple functions: it provides the common potential for liquid crystal switching and simultaneously acts as a shield against electric field leakage from the source line, making the electrode structure multi-functional
2Illumination intensity
If transmissive area is increased to improve display quality, then viewing angle and brightness improve, but electric field shielding becomes more difficult due to larger electrode coverage
Solution Approach 1:
The patent applies local quality by making the common electrode extend specifically along the source line region where electric field leakage occurs, providing enhanced shielding precisely where needed rather than uniformly across the entire electrode structure
Solution Approach 2:
The patent addresses the shielding problem in a different dimensional approach by extending the common electrode along the length of the source line, creating a three-dimensional electrode configuration that provides shielding coverage without reducing the transmissive area in the pixel region
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 enhances transmissivity and reduces display degradation by shielding electric fields, improving viewing angle and maintaining display quality across various orientations.
Implementation Method 1
a sub-common electrode extending in a first direction so as to face the gate line and crossing the source line on the third insulating film, a first main-common electrode connected with the sub-common electrode and extending along the source line in the second direction on the third insulating film
Implementation Method 2
Liquid crystal molecules are switched by the lateral electric field substantially in parallel with the principal surface of the array substrate
Implementation Method 3
Liquid crystal molecules are switched using the lateral electric field or an oblique electric field between the pixel electrode formed in the array substrate and the common electrode formed in a counter substrate
Data Source
AI summary
An array substrate includes a semiconductor layer, a first insulating film covering the semiconductor layer, a gate line extending in a first direction on the first insulating film, a second insulating film covering the gate line, a source line extending in a second direction orthogonally crossing the first direction on the second insulating film. A contact portion is formed on the second insulating film. The contact portion contacts with the semiconductor layer. A third insulating film covers the source line and exposing the contact portion and the second insulating film in a circumference of the contact portion.