IPS LCD Auxiliary Electrodes Reduce Crosstalk
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Solution Overview
Problem
In-plane switching (IPS) mode LCDs suffer from signal interference between data lines and pixel electrodes, leading to crosstalk, light leakage, and distortion of the electric field, which degrades picture quality and viewing angle.
Innovation Solution
The solution involves orienting the rubbing direction of the alignment film perpendicular to the data line and bending both ends of the pixel and common electrodes, with the addition of an auxiliary pixel electrode to minimize signal interference and prevent disclination phenomena, thereby maintaining the initial alignment of liquid crystal molecules and enhancing the aperture ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the data line and pixel electrode are arranged adjacent and parallel to each other, then the device structure is simplified, but signal interference and crosstalk occur
Solution Approach 1:
The harmful electric field generated by the data line is extracted and redirected to act on the common electrode rather than the pixel electrode. This is achieved by extending the common electrode to overlap with the data line, causing the data line's electric field to terminate on the common electrode instead of interfering with the pixel electrode.
Solution Approach 2:
The common electrode serves as an intermediary that receives and absorbs the harmful electric field from the data line. By positioning the common electrode to overlap with the data line, it acts as a mediator that prevents the data line's electric field from directly interfering with the pixel electrode, thus eliminating crosstalk.
2Object-affected harmful factors
If an outermost common electrode with larger width is disposed near the data line, then signal interference is reduced, but aperture ratio deteriorates
Solution Approach 1:
The common electrode performs multiple functions: it serves as the standard common electrode for generating the in-plane electric field, and simultaneously acts as a shield against the data line's electric field by overlapping with it. This multi-functionality eliminates the need for a separate outermost common electrode, maintaining aperture ratio while preventing signal interference.
Solution Approach 2:
The shielding function against data line interference is merged into the existing common electrode structure. By extending the common electrode to overlap with the data line, the same electrode structure serves both as the functional common electrode and as the interference shield, eliminating the need for additional electrodes that would reduce aperture ratio.
3Ease of manufacture
If the rubbing direction is parallel to the data line, then manufacturing is easier, but electric field distortion occurs
Solution Approach 1:
The rubbing direction is set at an asymmetric angle of 45 degrees relative to the data line, rather than being parallel or perpendicular. This asymmetric orientation, combined with the symmetric extension of the common electrode on both sides of the pixel electrode, creates a balanced configuration that prevents electric field distortion while maintaining manufacturing feasibility.
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 effectively reduces signal interference, prevents light leakage, and maintains the initial alignment of liquid crystal molecules, enhancing picture quality and aperture ratio by minimizing electric field distortion and disclination.
Implementation Method 1
an alignment film rubbed in a direction substantially perpendicular to the data line
Implementation Method 2
a pixel electrode and a common electrode alternately arranged in parallel in an extended direction of the gate line and generating an in-plane field of a first direction
Implementation Method 3
the LCD displays an image by controlling the light transmittance of a liquid crystal layer with the electric field formed between the pixel electrode 3 and the common electrode 5 according to the data signal supplied to each pixel region
Data Source
AI summary
An in-plane switching (IPS) liquid crystal mode liquid crystal display device that prevents signal interference of a data line and disclination is disclosed. The in-plane switching (IPS) mode liquid crystal display (LCD) device includes first and second substrates; a gate line on the first substrate; a data line crossing the gate line to form a pixel region; a thin film transistor at the crossing of the gate line and the data line; a plurality of pixel electrodes and common electrodes alternately arranged in parallel in an extended direction of the gate line and generating an in-plane field of a first direction; an alignment film rubbed in a direction substantially perpendicular to the data line; and a liquid crystal layer between the first and second substrates, wherein the pixel electrode and the common electrode are bent at both ends thereof and the in-plane field in the first direction is generated from both ends of the pixel electrode and the common electrode.