Display Driving Circuit Channel Layout for Low-Temperature Mura Control
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Solution Overview
Problem
In large-sized display products with high refresh rates, the charging time for each row of pixels is short, leading to low-temperature start-up difficulties and mischarging due to unstable discharge at the driving signal output end, causing horizontal Mura defects.
Innovation Solution
The display substrate incorporates a driving circuit with denoising transistors and transistors of varying channel lengths, including a first length for denoising transistors and a second length for driving transistors, to stabilize the gate electrode of the transistor for driving the signal output end, reducing leakage current and enhancing discharge efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the gate electrode and source electrode of a transistor for driving a pull-up node are separated to address low-temperature start-up difficulty, then low-temperature reliability is improved, but the discharge at the driving signal output end is adversely affected causing horizontal Mura defects
Solution Approach 1:
The patent divides the driving circuit into multiple independent transistor components with different channel lengths. Specifically, it separates the denoising function (handled by transistors with first channel length L1) from the driving function (handled by transistors with second channel length L2), allowing each segment to optimize its performance independently without interfering with the other.
Solution Approach 2:
The patent applies different channel length parameters to different transistor locations based on their specific functional requirements. Transistors in the denoising path (electrically connected to pull-up node) use channel length L1 optimized for noise reduction, while transistors in the driving path use channel length L2 optimized for driving performance, achieving local optimization of circuit characteristics.
2Device complexity
If a transistor for resetting a driving signal is not provided due to layout space issues, then device complexity is reduced, but the discharge at the driving signal output end is adversely affected
Solution Approach 1:
The patent designs transistors that perform multiple functions simultaneously. The denoising transistors with channel length L1 not only reduce noise but also contribute to the overall discharge capability of the circuit, eliminating the need for a separate resetting transistor and achieving space efficiency while maintaining reliability.
Solution Approach 2:
The patent optimizes the channel length parameter of existing transistors to achieve multiple functions. By carefully selecting channel length L1 for denoising transistors, the circuit achieves both noise reduction and adequate discharge capability without requiring additional transistors, thus reducing device complexity while maintaining reliability.
3Productivity
If the charging time for each row of pixels is short in large-sized display products with high refresh rate, then productivity is improved, but low-temperature start-up difficulty occurs
Solution Approach 1:
The patent creates a dynamic balance between charging speed and noise reduction by using transistors with specifically optimized channel length L1 in the denoising path. This allows the circuit to maintain high refresh rates for productivity while ensuring stable low-temperature start-up through effective noise reduction, achieving adaptability to different operating conditions.
Data Source
AI summary
The present disclosure provides a display substrate and a display device. The display substrate includes a base substrate and a driving circuit arranged on the base substrate. The driving circuit includes multiple denoising transistors and multiple transistors for driving, and the denoising transistors are electrically connected to a pull-up node. A length of a channel of each of at least a part of the denoising transistors is a first length L1, a length of a channel of each of at least a part of the multiple transistors for driving is a second length L2, and the first length L1 is not equal to the second length L2.