Display Substrate Driving Circuit for Stable High-Refresh Discharge
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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, resulting in 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
1Loss of time
If the gate electrode and source electrode are separated to address low-temperature start-up difficulty, then the charging time for each row of pixels is reduced, but the discharge at the driving signal output end is adversely affected due to lack of reset transistor
Solution Approach 1:
The patent separates the gate electrode and source electrode into distinct structures, allowing independent optimization of charging and discharge paths. The gate electrode is divided into multiple segments (gate electrode 1, gate electrode 2, etc.) that can be controlled independently, enabling precise timing control for high refresh rates while maintaining stable discharge through dedicated connection structures.
Solution Approach 2:
The patent introduces an intermediate connection structure between the gate electrode and source electrode, specifically a conductive layer that provides a stable discharge path. This intermediary element acts as a mediator that ensures reliable discharge at the driving signal output end while allowing the separated electrode structure to achieve fast charging times.
2Device complexity
If a transistor for resetting the driving signal is not provided due to layout space constraints, then the device complexity is reduced, but mischarging occurs due to slow pull-down of the driving signal potential
Solution Approach 1:
The patent designs the separated gate electrode structure to serve multiple functions: it acts as both the control electrode for timing and as part of the discharge path through its connection to the source electrode. This multi-functional design eliminates the need for a separate reset transistor while maintaining both fast charging and accurate discharge capabilities, thus reducing device complexity without sacrificing charging precision.
Solution Approach 2:
The patent implements a dynamic electrode structure where the gate and source electrodes can be independently controlled at different potentials during different phases of operation. During charging, the gate electrode is activated; during discharge, the connection structure enables rapid potential pull-down. This dynamic control allows the system to adapt its behavior phase-by-phase, achieving high precision charging without additional reset transistors.
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.