TFT Array Substrate With Overlapping Pixel Electrode Slits
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Solution Overview
Problem
Position errors between the color filter (CF) and thin film transistor (TFT) array substrates in liquid crystal displays (LCDs) lead to performance issues such as narrowed viewing angles, unstable liquid crystal molecule alignment, and image retention, affecting display quality and light transmittance.
Innovation Solution
The TFT array substrate is designed with first and second pixel electrodes that induce a multi-domain electric field by overlapping and non-overlapping slit structures, allowing for broader viewing angles without precise alignment with the CF substrate, thereby preventing position errors and enhancing display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If patterned CF and TFT array substrates are assembled, then viewing angle is broadened through multi-domain electric field, but position error occurs between substrates affecting display quality and light transmittance
Solution Approach 1:
The patent applies preliminary action by forming alignment marks and alignment layers on the TFT array substrate before assembly. The alignment marks are positioned at predetermined locations to serve as reference points for accurate alignment during the assembly process, preventing position errors between the CF and TFT array substrates.
Solution Approach 2:
The patent uses an alignment layer as an intermediary element that facilitates precise alignment between the CF substrate and TFT array substrate. This alignment layer includes alignment marks that act as mediators to ensure accurate positioning during assembly, eliminating the need for complex alignment procedures.
2Manufacturing precision
If precise alignment between CF and TFT array substrates is achieved, then position error is prevented, but manufacturing complexity increases
Solution Approach 1:
The alignment marks are formed in advance on the TFT array substrate before assembly operations. This preliminary formation of alignment references simplifies the subsequent alignment process during assembly, as the marks are already in place to guide precise positioning without requiring complex real-time alignment procedures.
Solution Approach 2:
The alignment layer with alignment marks serves as a simple intermediary mechanism that enables precise substrate alignment. This intermediary structure provides straightforward alignment references that reduce manufacturing complexity compared to complex active alignment systems.
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 design achieves a wider viewing angle and reduces color shift, improving display quality and light transmittance by creating a multi-domain electric field that stabilizes liquid crystal alignment without requiring precise substrate orientation.
Implementation Method 1
The different electrode regions may induce a multi-domain electric field to align LC molecules on multi-domains and thereby achieve a broadened view angle
Implementation Method 2
Many LCDs utilize liquid crystal (LC) molecule alignments to control ray transmissions
Data Source
AI summary
In one embodiment of an invention concerning liquid crystal display devices, a first pixel electrode of a thin film transistor (TFT) array substrate may overlap a slit of a second pixel electrode of the TFT array substrate but not overlap another slit of the second pixel electrode. This may help induce a multi-domain electric field without having to precisely position a common electrode of a color filter substrate and the TFT array substrate. This may prevent position errors, enhance display quality, produce a wider viewing angle, and lower color shift sometimes associated with conventional liquid crystal display devices and methods.