Display Panel Reference Voltage Lines Reduce Parasitic Capacitance
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Solution Overview
Problem
In organic light emitting display devices, the addition of sensing circuits to compensate for variations in driving characteristics between pixels reduces the aperture ratio and charging rate due to increased parasitic capacitance of data lines, affecting image quality.
Innovation Solution
The implementation of reference voltage lines overlapping pixel driving voltage lines with an insulating layer in between, and the use of a data driver and gate driver to supply appropriate voltages, minimizes the crossing of wires and reduces parasitic capacitance, thereby improving the aperture ratio and charging rate of pixels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sensing circuits are added to pixels to compensate for variations in driving characteristics, then pixel driving uniformity is improved, but aperture ratio decreases due to added elements and wires
Solution Approach 1:
The patent implements reference voltage lines in a different spatial dimension (overlapping the pixel driving voltage lines vertically) to provide voltage reference without adding horizontal wires that would reduce aperture ratio. This dimensional arrangement allows sensing circuit functionality while preserving pixel aperture area.
Solution Approach 2:
The reference voltage lines serve multiple functions: they provide voltage reference for sensing circuits, maintain pixel driving uniformity, and do not interfere with data line signal transmission. This multi-functionality allows the system to achieve reliable pixel driving without sacrificing aperture ratio.
2Area of stationary object
If multiple pixel circuits are connected to reduce the number of wires, then aperture ratio is maintained, but parasitic capacitance of data lines increases
Solution Approach 1:
The patent segments the voltage supply function by introducing separate reference voltage lines that are electrically isolated from data lines through insulating layers. This segmentation prevents capacitive coupling between data lines and voltage references, reducing parasitic capacitance while maintaining aperture ratio.
Solution Approach 2:
The insulating layer acts as an intermediary between the reference voltage lines and data lines, blocking capacitive coupling while allowing voltage reference to be transmitted to sensing circuits. This intermediary structure reduces parasitic capacitance without compromising electrical functionality.
3Speed
If parasitic capacitance of data lines is reduced, then charging rate of pixels is improved, but device structure becomes more complex
Solution Approach 1:
The reference voltage lines are nested within the existing pixel circuit structure by overlapping the pixel driving voltage lines vertically. This nested arrangement reduces parasitic capacitance and improves charging rate without requiring separate external reference voltage lines, thus avoiding increased device complexity.
Solution Approach 2:
By arranging reference voltage lines in the vertical dimension (overlapping pixel driving voltage lines) rather than horizontally, the patent achieves reduced parasitic capacitance and improved charging rate while maintaining a compact device structure. This dimensional approach avoids adding complex external wiring.
Data Source
AI summary
The present disclosure relates to a display panel and a display device using the same. The display panel includes: a plurality of data lines to which a data voltage is applied; a plurality of pixel driving voltage lines arranged parallel to the data lines, and to which a pixel driving voltage is applied; and a plurality of reference voltage lines overlapping the pixel driving voltage lines with an insulating layer disposed therebetween, arranged in parallel with the data lines, and to which a reference voltage lower than the pixel driving voltage is applied.