Thin Film Transistor Array Substrate Crosstalk Reduction
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Solution Overview
Problem
The challenge in organic light-emitting display apparatuses is to reduce crosstalk due to coupling between data lines and capacitors while maintaining high definition, which is hindered by the limited space for pixel circuits and the requirement for a mesh structure in driving voltage lines.
Innovation Solution
A thin film transistor array substrate with a mesh structured driving voltage line, where the second line of the driving voltage line completely covers the capacitor, and interlayer insulating layers are used to stack and position the components effectively, reducing crosstalk and allowing for high definition displays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the data line is positioned above the capacitor to save space, then the available space for pixel circuits is increased, but crosstalk due to coupling between the data line and capacitor increases
Solution Approach 1:
A driving voltage line is introduced as an intermediary element positioned between the capacitor and the data line. This driving voltage line acts as a shield that reduces the electromagnetic coupling between the data line and capacitor, thereby minimizing crosstalk while allowing the data line to be positioned above the capacitor for space efficiency.
Solution Approach 2:
The driving voltage line is configured with a mesh structure having first lines extending in a first direction and second lines extending in a second direction substantially perpendicular to the first direction. This three-dimensional mesh configuration provides shielding effectiveness while occupying minimal planar space, resolving the contradiction between space utilization and crosstalk reduction.
2Reliability
If the driving voltage line is designed with a mesh structure to reduce voltage drop, then the display performance is improved, but the device complexity increases
Solution Approach 1:
The driving voltage line is segmented into a mesh structure consisting of first lines extending in a first direction and second lines extending in a second direction substantially perpendicular to the first direction. This segmentation creates multiple parallel conduction paths that reduce voltage drop through distributed current flow, while the regular mesh pattern maintains manufacturing simplicity.
Solution Approach 2:
The mesh-shaped driving voltage line simultaneously serves multiple functions: it provides voltage supply to the pixel circuit, acts as a shield against crosstalk between the data line and capacitor, and maintains voltage stability across the display panel. This multi-functionality reduces the need for additional separate components.
3Object-generated harmful factors
If the second line of the driving voltage line completely covers the capacitor, then the shielding effect against crosstalk is maximized, but the area occupied by the driving voltage line increases
Solution Approach 1:
The driving voltage line utilizes a mesh configuration with lines extending in substantially perpendicular directions, allowing the second line to completely cover the capacitor area in planar projection while maintaining minimal actual material usage. The perpendicular orientation of the mesh lines provides comprehensive shielding without requiring a solid continuous layer.
Data Source
AI summary
A thin film transistor array substrate includes a plurality of pixels, each of the pixels including a capacitor comprising a first electrode, and a second electrode located above the first electrode, a data line extending in a first direction, configured to provide a data signal, located above the capacitor, and overlapping a part of the capacitor, and a driving voltage line configured to supply a driving voltage, located between the capacitor and the data line, and comprising a first line extending in the first direction, and a second line extending in a second direction substantially perpendicular to the first direction.