Pixel Unit Edge Electrode Design for Liquid Crystal Alignment
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Solution Overview
Problem
Conventional pixel units experience light leakage or dark lines in the edge region due to misalignment of substrates, which affects dark state luminance and transmittance.
Innovation Solution
A pixel unit design featuring a thin film transistor and pixel electrodes with strategically positioned strip edge electrodes that extend perpendicularly to the edges, aligning liquid crystals and preventing misalignment-induced issues, thereby enhancing control over liquid crystal arrangement and preventing light leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If an opening design is used in the edge region of the pixel electrode to facilitate liquid crystal arrangement, then liquid crystal alignment is improved, but substrate misalignment causes light leakage or dark lines in the edge region
Solution Approach 1:
The pixel electrode is divided into different regions with different structures: the edge region has a protruding structure that extends toward the edge of the pixel unit, while the central region has a different configuration. This local structural differentiation allows the edge region to provide better liquid crystal alignment control through the protruding structure, while the overall design maintains stability against substrate misalignment effects.
2Area of stationary object
If the pixel electrode extends to the edge of the pixel unit, then the light-transmission region is maximized, but misalignment between substrates causes dark lines in the edge region
Solution Approach 1:
The protruding structure at the edge of the pixel electrode is designed in advance to counteract the potential negative effects of substrate misalignment. By extending this structure toward the edge region before assembly, it pre-establishes a configuration that compensates for alignment errors, preventing dark lines from forming when the substrates are assembled with slight misalignment.
3Ease of manufacture
If conventional pixel electrode design is used, then manufacturing is simple, but light leakage occurs in the edge region affecting transmittance
Solution Approach 1:
The pixel electrode incorporates a localized protruding structure at the edge region while maintaining a conventional design in the central region. This selective modification improves transmittance by preventing light leakage at the edges through better liquid crystal control, while the majority of the electrode retains the simple conventional structure for ease of manufacturing.
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 design effectively suppresses dark lines and light leakage, improving transmittance and contrast by ensuring proper alignment of liquid crystals and forming a stable dark area at the edges.
Implementation Method 1
the pixel electrode electrically connected to the drain of the thin film transistor... controlling whether to transmit the data signal to a pixel electrode
Data Source
AI summary
A pixel unit is provided. The pixel unit includes a first strip main electrode extending to a first edge of the pixel unit. A first strip edge electrode of the first strip main electrode extends perpendicularly to the first edge. The present invention improves light leakage or dark lines occurring in the edge region of the pixel unit due to misalignment between an upper substrate and a lower substrate which are assembled.