Display Substrate Data Line Layout for Crosstalk Cancellation
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Solution Overview
Problem
In liquid crystal displays, parasitic capacitors formed between data lines and pixel electrodes lead to unequal capacitance values, causing crosstalk and affecting the display effect due to unequal voltage differences between pixel and common electrodes.
Innovation Solution
The display substrate design includes data lines arranged in a different layer than pixel electrodes, with branch lines overlapping pixel electrodes, and storage electrodes forming capacitors to equalize capacitance values and reduce crosstalk, using a reflective metal material and specific geometries to minimize parasitic capacitance effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If data lines are arranged in the same layer as pixel electrodes, then manufacturing process is simpler, but parasitic capacitance increases causing crosstalk
Solution Approach 1:
The data line is moved from the same layer as pixel electrodes to a different layer (typically below the pixel electrode layer), utilizing the vertical dimension to separate conductors that would otherwise be coplanar. This spatial reconfiguration reduces parasitic capacitance between data lines and pixel electrodes while maintaining electrical connectivity through via holes, effectively eliminating crosstalk without significantly complicating the manufacturing process.
Solution Approach 2:
The data line is divided into multiple segments: a first branch line portion, a second branch line portion, and a trunk line portion. These segmented portions are strategically positioned to overlap with different pixel electrodes in the vertical projection, allowing the data line to serve multiple pixels while minimizing parasitic capacitance effects through distributed capacitance cancellation.
2Object-affected harmful factors
If data line branch lines overlap pixel electrodes, then parasitic capacitance is reduced, but data line structure becomes more complex
Solution Approach 1:
The data line structure serves multiple functions simultaneously: the first and second branch line portions provide electrical connections to different pixel electrodes, the trunk line portion provides a common connection path, and the overlapping portions with pixel electrodes create parasitic capacitances that cancel each other out. This multi-functional design achieves both signal distribution and parasitic capacitance reduction.
Solution Approach 2:
The data line employs asymmetric configuration where the first branch line and second branch line are positioned on opposite sides of the trunk line, with their orthographic projections overlapping different pixel electrodes. This asymmetric arrangement creates unequal parasitic capacitances that, when combined with opposite polarity voltages, achieve cancellation of crosstalk effects.
3Ease of operation
If adjacent data lines have same polarity, then voltage distribution is simpler, but crosstalk increases between adjacent lines
Solution Approach 1:
Adjacent data lines are assigned opposite polarity voltages (e.g., +V and -V), creating counterbalancing electric fields that cancel each other's crosstalk effects. This voltage inversion strategy ensures that the parasitic capacitance effects from adjacent data lines with opposite polarities counterbalance each other, reducing net crosstalk while maintaining simple voltage distribution through alternating polarity patterns.
Data Source
AI summary
A display substrate is provided, including: a base (1); and a plurality of pixel units (10) located on the base (1) and arranged in an array, where the display substrate further includes a plurality of data lines (25), and for each of the plurality of data lines (25), the data line (25) extends along a column direction and is located between adjacent first pixel unit (10A) and second pixel unit (10B) in a row direction, the data line (25) is arranged in a different layer from a first pixel electrode (40A) of the first pixel unit (10A) and a second pixel electrode (40B) of the second pixel unit (10B), and the data line (25) includes a first branch line (252) and a second branch line (253) that are connected in parallel and extend in the column direction; an orthographic projection of the first branch line (252) on the base (1) at least partially overlaps with an orthographic projection of the first pixel electrode (40A) on the base (1); an orthographic projection of the second branch line (253) on the base (1) at least partially overlaps with an orthographic projection of the second pixel electrode (40B) on the base (1). A display panel and a method of manufacturing a display substrate are further provided.