Array Substrate Viewing Angle Stability via Electrode Inversion
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Solution Overview
Problem
Single-domain Advanced-Super Dimensional Switching (AD-SDS) Liquid Crystal Displays (LCDs) experience displaying discomfort due to the shifting of the preferable viewing angle region caused by the angled orientation of liquid crystals, which affects the alignment of the alignment films on the array and color filter substrates.
Innovation Solution
The array substrate design includes data and gate lines defining pixel units with overlapping first and second electrodes, where the second electrode is positioned above the first and forms a predetermined angle with the substrate, and the alignment film's rubbing direction is parallel to the substrate, ensuring the original orientation of liquid crystals is consistent with the substrate's side, thereby maintaining the viewing angle region's alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the rubbing direction of the alignment film forms an angle of about 7 degrees with the reference line to avoid driving disorder, then the liquid crystal orientation is correct, but the preferable viewing angle region shifts about 7 degrees from the reference line, causing displaying discomfort
Solution Approach 1:
Instead of angling the rubbing direction relative to the reference line, the patent inverts the approach by making the rubbing direction parallel to the reference line (0 degrees) and angling the pixel electrode direction relative to the rubbing direction. This reverses the reference frame and eliminates the viewing angle shift while maintaining proper liquid crystal orientation.
Solution Approach 2:
The patent changes the angular parameter from 7 degrees (rubbing direction relative to reference line) to 0 degrees (rubbing direction parallel to reference line), and compensates by adjusting the pixel electrode angle. This parameter change resolves the contradiction by eliminating the viewing angle shift.
2Ease of operation
If the rubbing direction is parallel to the reference line to prevent viewing angle region shifting, then the viewing angle alignment is improved, but the liquid crystal original orientation may not form the required angle with the reference line, potentially causing driving disorder
Solution Approach 1:
The patent inverts the angular relationship by making the rubbing direction parallel to the reference line and allowing the pixel electrode to form an angle with the rubbing direction. This ensures both viewing angle alignment and proper liquid crystal orientation without contradiction.
Solution Approach 2:
The patent creates an asymmetric angular relationship where the rubbing direction is symmetrically aligned with the reference line (0 degrees), but the pixel electrode direction is asymmetrically angled relative to the rubbing direction. This asymmetric configuration resolves the contradiction between viewing angle alignment and driving order.
3Reliability
If different rubbing directions are used for alignment films on array substrate and color filter substrate to achieve proper liquid crystal orientation, then the driving order is maintained, but the manufacturing process becomes more complex and production efficiency decreases
Solution Approach 1:
The patent makes the rubbing direction universal by setting it parallel to the reference line for both the array substrate and the color filter substrate. This single rubbing direction (parallel to reference line) serves both substrates, simplifying the manufacturing process while maintaining proper liquid crystal orientation and driving order through the angled pixel electrode configuration.
Solution Approach 2:
The patent changes the rubbing direction parameter from angled (7 degrees) to parallel (0 degrees) for both substrates, and compensates for the orientation requirement through the pixel electrode angle. This parameter change simplifies manufacturing and improves production efficiency while maintaining driving order.
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 prevents the shifting of the viewing angle region, ensuring normal displaying and improving the production efficiency by allowing identical rubbing directions for alignment films on both substrates, thus enhancing the displaying quality and manufacturing capacity.
Implementation Method 1
a rubbing direction of the alignment film is parallel to the one side of the array substrate
Implementation Method 2
a parallel electric field generated through the fringes of pixel electrodes or common electrodes positioned in the same plane and a vertical electric field generated between the pixel electrode and the common electrode on different levers can constitute a multi-dimensional electric field, and thus, liquid crystal molecules can be rotated
Data Source
AI summary
An embodiment of the present disclosure provides an array substrate, and the array substrate including: at least a data line and at least a gate line; and a plurality of pixel units defined by the data line and the gate line. Each of the plurality of pixel units includes a thin film transistor, a first electrode and a second electrode, and the first electrode and the second electrode overlap each other and are insulated from each other and the second electrode is positioned above the first electrode. An alignment film is formed on a surface of the array substrate, a direction of the second electrode and one side of the array substrate form a predetermined angle and a rubbing direction of the alignment film is parallel to the one side of the array substrate.