Bidirectional Gate Driver Circuit for Narrow-Bezel Displays
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Solution Overview
Problem
Existing gate driving circuits are inefficient, and their integration into the display panel, and the bezel area is inefficient, and their integration into the display panel, and the bezel area is inevitable when the gate driving circuit is more complex.
Innovation Solution
A gate driving circuit is designed with a pull-up transistor, pull-down transistor, pump capacitor, pump transistor, clock transistor, and direction selection circuit to simplify the circuit while maintaining performance, allowing the gate driving circuit to be integrated into the display panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the gate driving circuit is made more complex to improve driving performance, then the performance is improved, but the bezel area increases
Solution Approach 1:
The gate driving circuit is designed to perform both forward scanning and backward scanning functions using a single circuit structure. The direction selection circuit enables the circuit to operate in different modes (forward or backward) based on control signals, making the circuit universal and eliminating the need for separate circuits for each scanning direction, thereby reducing the bezel area while maintaining driving performance
Solution Approach 2:
The circuit incorporates a direction selection circuit that can dynamically switch between forward and backward scanning modes based on control signals. This dynamic capability allows the same circuit to adapt to different scanning requirements without needing multiple fixed circuits, reducing the overall area occupied by the gate driving circuit
2Area of stationary object
If the gate driving circuit is simplified to reduce bezel area, then the design area efficiency is improved, but the driving performance may deteriorate
Solution Approach 1:
By designing the gate driving circuit to support both forward and backward scanning modes through the direction selection circuit, the simplified circuit structure achieves multi-functionality. This allows the reduced circuit to maintain comprehensive driving performance capabilities that would otherwise require more complex separate circuits
Solution Approach 2:
The circuit uses parameter changes through control signals to the direction selection circuit and transistors to switch between operational modes. By dynamically adjusting the state of transistors and selection circuits based on control signals, the simplified circuit maintains the necessary driving performance across different scanning directions without requiring additional permanent circuit elements
Data Source
AI summary
A display device can include a display panel having a plurality of sub-pixels disposed thereon, and a gate driving circuit configured to output a gate signal to the plurality of sub-pixels. The gate driving circuit includes a pull-up transistor controlled by a voltage level of a Q-node, a pull-down transistor configured by a voltage level of a QB-node, a pump capacitor electrically connected between the Q-node and a clock signal input terminal, a pump transistor electrically connected between the pump capacitor and the Q-node and controlled by the gate signal output to a gate line, a clock transistor electrically connected between the pump capacitor and the clock signal input terminal and controlled by a voltage level of a start signal input node, and a direction selection circuit configured to output a forward start signal or a backward start signal to the start signal input node.