Pixel Drive Circuit Layout for Low-Interference Signal Crossovers
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Solution Overview
Problem
Existing display technologies face interference issues due to a large number of crossovers in signal lines, leading to increased parasitic capacitance and signal interference in pixel drive circuits.
Innovation Solution
A pixel drive circuit design with cascaded scan, emission, compensation, and reset drive circuits arranged sequentially, with the scan drive circuit positioned farthest from the pixels, and cutouts at overlapping signal line portions to reduce interference and capacitance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If signal lines are arranged in a conventional layout, then the pixel drive circuit can be implemented, but parasitic capacitance and signal interference increase due to crossovers
Solution Approach 1:
The patent extracts and removes overlapping portions of signal lines by introducing cutouts in the gate line at locations where it crosses with emission control lines, compensation lines, and reset lines. This extraction of the harmful overlapping portions directly reduces parasitic capacitance between crossed signal lines while maintaining the necessary electrical connections and circuit functionality.
Solution Approach 2:
The patent applies local quality by selectively introducing cutouts only at specific overlapping locations of signal lines rather than uniformly across the entire circuit. The gate line is modified locally at crossover points with emission control lines, compensation lines, and reset lines, while maintaining its continuous structure in non-overlapping regions, thus reducing parasitic capacitance only where necessary.
2Ease of manufacture
If multiple signal lines cross each other, then the pixel drive circuit can be implemented with necessary connections, but signal interference increases
Solution Approach 1:
The patent extracts the harmful overlapping portions of signal lines by introducing cutouts in the gate line at crossover locations with emission control lines, compensation lines, and reset lines. This removal of overlapping sections directly reduces signal interference while preserving the necessary electrical connections through alternative routing paths.
Solution Approach 2:
The patent introduces cutouts as intermediary structural modifications to the gate line, which act as mediators to reduce direct electromagnetic coupling between crossed signal lines. These cutouts serve as intermediate solutions that maintain circuit connectivity while reducing parasitic capacitance and signal interference between adjacent signal lines.
3Speed
If scan drive circuit is positioned closest to pixels, then signal transmission is shorter, but interference with pixel emission increases
Solution Approach 1:
The patent applies asymmetry by positioning the scan drive circuit at a specific location in the pixel column direction and introducing cutouts at asymmetric locations where the gate line crosses with emission control lines. The cutouts are strategically placed to reduce interference with the pixel emission region while maintaining efficient signal transmission to the pixels.
Solution Approach 2:
The patent modifies the gate line locally at specific crossover points with emission control lines by introducing cutouts. These local modifications reduce electromagnetic interference with the pixel emission region while maintaining the overall signal transmission path and speed from the scan drive circuit to the pixels.
Data Source
AI summary
Provided is a pixel drive circuit. The pixel drive circuit includes a plurality of scan drive circuits transmitting gate drive signals to pixels, a plurality of emission drive circuits transmitting emission control signals to the pixels, a plurality of compensation drive circuits transmitting compensation signals to the pixels, and a plurality of reset drive circuits transmitting reset signals to the pixels, which are all cascaded in a pixel column direction. In addition, in the pixel row direction, a length of the scan drive circuit is greater than a length of the emission drive circuit and greater than a length of the compensation drive circuit, and the length of the compensation drive circuit is greater than the length of the emission drive circuit.