Shift Register Resistor Pull-Down Circuit for Static Charge Management
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Solution Overview
Problem
The accumulation of static charges in shift registers can lead to circuit failures and short circuits between high and low voltage power supplies, causing increased power consumption and faults in display panels, particularly due to large leakage currents in thin film transistors.
Innovation Solution
Incorporating resistors and capacitors in the shift register design to prevent short circuits by managing voltage conditions and static charge accumulation, thereby enhancing the reliability and reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If thin film transistors are used in the shift register, then device integration and cost are improved, but leakage current increases causing static charge accumulation and short circuits
Solution Approach 1:
A first pull-down circuit is introduced as an intermediary component between the power supply and the shift register circuit. This circuit includes a pull-down transistor and a resistor that work together to actively discharge accumulated static charges from the node, preventing short circuits between power supply lines while maintaining the benefits of thin film transistor integration.
Solution Approach 2:
The harmful effect of static charge accumulation is extracted and addressed by separating the charge discharge function into a dedicated pull-down circuit. This circuit is independently controlled by a control signal that activates the pull-down transistor only when needed to remove excess charges, without interfering with the normal operation of the shift register.
2Area of stationary object
If multiple cascaded shift registers are integrated on array substrate, then bonding region and fan-out region space are saved, but static charge accumulation risk increases
Solution Approach 1:
The gate driving circuit is divided into multiple independent shift register units, each equipped with its own first pull-down circuit. This segmentation allows each unit to independently manage its own static charge accumulation, preventing the propagation of electrostatic damage across the entire cascaded structure while maintaining the space-saving integration benefits.
3Reliability
If first pull-down circuit is added to prevent short circuits, then circuit reliability is improved, but device complexity increases
Solution Approach 1:
The first pull-down circuit is merged with the existing shift register structure by sharing control signals and integrating the pull-down transistor into the same fabrication process. The resistor is connected to existing nodes in the circuit, allowing the charge discharge function to be added without creating entirely separate circuit paths or requiring additional control logic.
Data Source
AI summary
A shift register, a gate driving circuit and a display panel. The shift register includes an input circuit, an output circuit, a storage circuit, an output pull-down circuit, a pull-up circuit of a pull-down node, a pull-down circuit of the pull-down node, and a first pull-down circuit of a pull-up node. The first pull-down circuit of the pull-up node includes a resistor, and the resistor is configured to prevent a short circuit between a first power supply end and a second power supply end.