TFT Array Substrate Slit Angles and Absent Regions
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Solution Overview
Problem
In Advanced Super Dimension Switch (ADSDS) technology, reverse rotation domains and disclination lines occur at the corners of slit electrodes in TFT-LCDs, leading to low light transmittance due to the electric field, which existing designs fail to effectively prevent or improve.
Innovation Solution
A TFT array substrate with upper layer electrodes having slits featuring angles of ≤90° and corresponding absent regions on the lower layer electrode, which weakens the electric field at these regions, preventing reverse rotation domains and disclination lines, thereby enhancing light transmittance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If sharp angle processing is performed on the slits of the upper layer electrode to eliminate reverse rotation domains, then the manufacturing precision is improved, but the light transmittance in the corner region remains low due to persistent disclination lines
Solution Approach 1:
The patent applies local quality by creating absent regions in the lower layer electrode specifically at the corner positions where the upper layer electrode has angles ≤90°. This localized modification targets only the problematic corner regions while leaving the rest of the electrode structure intact, thereby improving light transmittance where needed without affecting the overall electrode functionality.
Solution Approach 2:
The patent transitions from modifying only the upper layer electrode (single dimension) to coordinating modifications across both upper and lower layer electrodes (multiple dimensions). By adding absent regions in the lower layer electrode that correspond to the corner regions of the upper layer electrode, the solution addresses the problem in a multi-dimensional electrode configuration.
2Reliability
If the upper layer electrode is designed with slits having angles ≤90° to improve display quality, then the ADS technology benefits, but reverse rotation domains and disclination lines occur at the corner regions causing low light transmittance
Solution Approach 1:
The patent applies local quality by creating absent regions in the lower layer electrode specifically at the corner positions where the upper layer electrode has angles ≤90°. This localized modification targets only the problematic corner regions while leaving the rest of the electrode structure intact, thereby improving light transmittance where needed without affecting the overall electrode functionality.
Solution Approach 2:
The patent converts the harmful effect of corner regions (which cause reverse rotation domains) into a beneficial structure by intentionally designing absent regions in the lower layer electrode at these same corner positions. This transforms the problematic corner areas into zones that actively prevent reverse rotation domains while maintaining the overall ADS technology benefits.
3Illumination intensity
If absent regions are added to the lower layer electrode to prevent reverse rotation domains, then the light transmittance is improved, but the device complexity increases due to additional patterning requirements
Solution Approach 1:
The patent applies segmentation by dividing the lower layer electrode into regions with and without absent portions. The absent regions are strategically segmented to coincide with the corner positions of the upper layer electrode, creating a segmented electrode structure that addresses specific local problems without requiring complete redesign of the entire electrode system.
Solution Approach 2:
The patent applies local quality by creating absent regions in the lower layer electrode specifically at the corner positions where the upper layer electrode has angles ≤90°. This localized modification targets only the problematic corner regions while leaving the rest of the electrode structure intact, thereby improving light transmittance where needed without affecting the overall electrode functionality.
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 proposed solution effectively reduces the occurrence of reverse rotation domains and disclination lines, improving light transmittance at the corners of the slit electrodes, resulting in enhanced display quality.
Implementation Method 1
a electric field generated by fringes of slit electrodes in the same plane and a electric field generated between the slit electrode layer and the plate electrode layer can constitute a multi-dimension electric field
Implementation Method 2
a electric field generated by fringes of slit electrodes in the same plane and a electric field generated between the slit electrode layer and the plate electrode layer can constitute a multi-dimension electric field, so as to make liquid crystal molecules oriented in all directions
Data Source
AI summary
Embodiments of the present invention provide a TFT array substrate and a manufacturing method thereof, and a display apparatus. The TFT array substrate comprises upper and lower layer electrodes insulating from each other, wherein the upper layer electrode has slits, the slits comprising at least one pair of angles of less than or equal to 90°; the lower layer electrode is a whole-plane electrode. The lower layer electrode has absent regions, and each of the absent regions corresponds to the corresponding angle of less than or equal to 90° of the slits of the upper layer electrode.