Display Panel Signal Line Overlap Segmentation for Crosstalk Control
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Solution Overview
Problem
Denser wiring in display panels leads to signal crosstalk due to parasitic capacitance at overlaps between power supply and data signal lines, degrading display quality.
Innovation Solution
A display panel design where the power supply signal line overlaps the data signal line with strategically placed through holes, reducing the effective overlap area and parasitic capacitance, and incorporating a second data signal line that does not overlap the power supply signal line, along with optimized layer structures and material thicknesses to minimize impedance and resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the wiring density is increased to achieve higher resolution and more pixel circuit elements, then the display panel can support higher resolution and more complex pixel drive circuits, but parasitic capacitance increases at line overlaps causing signal crosstalk and degraded display quality
Solution Approach 1:
The overlapping region between power supply signal line and data signal line is segmented by introducing through holes that divide the continuous overlap into discrete segments. This reduces the effective overlapping area and consequently decreases the parasitic capacitance while maintaining the necessary wiring density for high resolution displays
Solution Approach 2:
The through holes are strategically positioned only in the overlapping regions between signal lines, creating a localized modification. This allows the wiring density to remain high in non-overlapping areas while reducing parasitic capacitance specifically where overlaps occur, thus maintaining display resolution without suffering from signal crosstalk
2Reliability
If the power supply signal line width is increased to reduce resistance and maintain signal stability, then voltage drops are reduced, but the parasitic capacitance at overlaps with data signal lines increases causing more signal crosstalk
Solution Approach 1:
By segmenting the overlapping region with through holes, the effective overlapping area is reduced proportionally to the area occupied by through holes. This allows the power supply signal line to maintain its width for low resistance while the segmented overlap reduces parasitic capacitance and signal crosstalk
Solution Approach 2:
The geometry parameters of the overlapping region are modified by introducing through holes, changing the effective overlapping area from a continuous region to a fragmented region. This parameter change reduces the parasitic capacitance value while allowing the power supply line width to remain sufficient for maintaining signal stability
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 design reduces signal crosstalk and improves display quality by minimizing parasitic capacitance and maintaining signal stability, as evidenced by reduced signal fluctuations from 95 mV to 65 mV in verification results.
Implementation Method 1
there are overlaps between lines of different potentials in a thickness direction of the display panel, and large parasitic capacitances are generated at the overlaps
Data Source
AI summary
A display panel includes pixel circuitry disposed on a substrate. The pixel circuitry includes a plurality of transistor groups and a plurality of signal line groups. The plurality of transistor groups are divided into a plurality of transistor group columns by the signal line groups. Each transistor group is disposed between two adjacent signal line groups. Each signal line group includes a power supply signal line and a first data signal line. The power supply signal line at least partially overlaps the first data signal line in a thickness direction of the display panel. The power supply signal line is provided with at least one through hole. The first data signal line overlaps the through hole in the thickness direction.