IPS Array Substrate Comb Electrode Crosstalk Reduction
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Solution Overview
Problem
The array substrate with a comb-like electrode structure in IPS liquid crystal display devices experiences low light transmittance due to incomplete separation of pixel and common electrodes, leading to signal crosstalk and disordered liquid crystal alignment, which is exacerbated by the need for a gap of at least 6 μm between them.
Innovation Solution
The method involves forming the first and second electrodes in separate patterning processes, allowing for a smaller gap between them while ensuring complete separation, using a sequence of forming a conductive thin film and insulation film, and etching to create patterns, which reduces residual electrode material and signal crosstalk, and includes forming a gate insulation layer to improve electrical insulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a gap of at least 6 μm is maintained between pixel and common electrodes to ensure complete separation, then signal crosstalk is prevented, but light transmittance decreases
Solution Approach 1:
The patent introduces a vertical dimension by forming the common electrode on a separate lower substrate with an insulation layer, allowing horizontal overlap of electrodes while maintaining vertical electrical separation. This dimensional change enables the electrodes to occupy the same planar space without direct contact, preventing crosstalk while maximizing light transmittance area
Solution Approach 2:
An insulation layer is introduced as an intermediary between the pixel electrode and common electrode. This insulation layer, formed on the lower substrate before depositing the common electrode material, acts as a mediator that provides electrical isolation while allowing the electrodes to be positioned closer together or overlap in the planar view, thereby maintaining signal separation while improving light transmittance
2Manufacturing precision
If electrodes are formed in separate patterning processes, then manufacturing complexity increases, but manufacturing precision improves
Solution Approach 1:
The insulation layer is formed on the lower substrate before the common electrode is deposited. This preliminary action of creating the insulation layer first establishes a defined interface and electrical isolation barrier, enabling subsequent precise patterning of the common electrode with better alignment and separation control
Solution Approach 2:
The electrode formation process is segmented into distinct stages: forming the insulation layer first, then depositing and patterning the common electrode separately from the pixel electrode. This segmentation of the manufacturing process into independent patterning steps allows each electrode to be precisely controlled without interference from the other
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 approach increases light transmittance by allowing a smaller gap between electrodes without signal crosstalk, improving liquid crystal alignment and efficiency, and maintains the same number of patterning processes as existing methods.
Implementation Method 1
each of the first and second electrodes is a comb-like electrode, and the first and second electrodes are configured to generate an electric field therebetween when being applied with a voltage
Data Source
AI summary
Embodiments of the disclosure provide an array substrate and a method for manufacturing the array substrate. The array substrate includes a substrate, a first electrode disposed on the base substrate and a second electrode disposed on the base substrate and located in a different layer from the first electrode with an insulation layer being disposed therebetween, wherein each of the first and second electrodes is a comb-like electrode, and the first and second electrodes are configured to generate an electric field therebetween when being applied with a voltage.