Display Panel Control Line Impedance Reduction
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Solution Overview
Problem
Display panels face issues such as line crosstalk, first frame brightness, residual shadow, and high power consumption, which affect their performance.
Innovation Solution
The display panel design includes data lines, sub-pixels, demultiplexers, and control lines, where the sub-pixels are of different colors and the demultiplexers are connected to multiple data lines. The control lines have a first wiring section with a greater line width than the second control lines, and this wiring section includes sub-wirings in different layers connected by vias, reducing impedance and improving voltage writing efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the control line uses a standard line width, then the manufacturing process is simple, but the impedance is high causing line crosstalk and image smear
Solution Approach 1:
The control line is segmented into multiple sub-wirings (first sub-wiring, second sub-wiring, third sub-wiring) arranged in parallel. Each sub-wiring has a smaller individual width but collectively they provide a larger effective width, reducing impedance while maintaining manufacturability across multiple metal layers
Solution Approach 2:
The control line transitions from a single-plane structure to a three-dimensional multi-layer structure. Sub-wirings are distributed across different metal layers (first metal layer, second metal layer, third metal layer) and connected via vias, adding vertical dimensionality to reduce impedance without increasing horizontal footprint
2Manufacturing precision
If the control line uses a wider line width, then the impedance is reduced and voltage writing efficiency is improved, but the manufacturing precision requirement increases
Solution Approach 1:
Different sections of the control line have different line widths optimized for their specific functions. The first wiring section has a greater line width for low-impedance signal transmission, while other sections maintain standard widths, allowing localized optimization without uniformly increasing manufacturing precision requirements across the entire structure
Solution Approach 2:
The control line employs a composite structure combining multiple metal layers with different sub-wirings connected by vias. This composite wiring architecture achieves equivalent or superior electrical performance to a single thick trace while distributing the manufacturing complexity across multiple standard-thickness layers
3Reliability
If the demultiplexer uses more transistors, then the data line coupling to sub-pixels is improved, but the device complexity increases
Solution Approach 1:
The demultiplexer is designed with multiple transistors (first transistors, second transistors, third transistors) that can selectively couple one input terminal to multiple different output terminals. This multi-functional switching capability ensures reliable data transmission to various sub-pixel groups while maintaining a systematic and scalable architecture
Data Source
AI summary
A display panel, driving method for the same and display apparatus. An input terminal and output terminals of a demultiplexer are coupled to a data terminal and at least two data lines, respectively; one transistor is connected to one corresponding data line, the data line connected to a first transistor and the data line connected to a second transistor is coupled to a plurality of first sub-pixels and a plurality of second and/or third sub-pixels, respectively; a control terminal of the first transistor is coupled to a first control line, and a control terminal of the second transistor is coupled to a second control line; the first control line includes a first wiring section, which is greater than the second control line in line width; and/or the first wiring section includes a first and second sub-wiring arranged in different layers and connected with each other by at least two vias.