Gate Driver Circuit Reducing Leakage Current
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Solution Overview
Problem
The existing gate driver circuits in display devices are limited by a large size and significant leakage current, which deteriorates image quality due to increased threshold voltage variations and voltage drops, leading to incomplete transistor turn-off states.
Innovation Solution
A gate driver circuit design with reduced transistor count per stage, incorporating M nodes, Q1 and Q2 nodes, line selectors, stabilizers, inverters, and signal output modules, which manage voltage levels to prevent leakage current and maintain transistors in a completely turned-off state, thereby ensuring stable operation and normal signal output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the number of transistors in each stage circuit is reduced to decrease gate driver circuit size, then the display area increases, but leakage current occurs due to threshold voltage changes and voltage drops
Solution Approach 1:
The gate driver circuit is divided into multiple stage circuits (first stage circuit, second stage circuit, etc.), where each stage is independently designed with optimized transistor arrangements. This segmentation allows each stage to use minimal transistors (reducing overall circuit size and display area occupation) while maintaining reliable transistor turn-off states through proper stage isolation and signal propagation design.
Solution Approach 2:
The patent optimizes voltage levels and timing parameters for transistor switching operations. By carefully controlling gate-source voltages and switching sequences, the circuit ensures complete transistor turn-off even with reduced transistor counts, preventing leakage current while maintaining compact stage circuit design.
2Device complexity
If the number of transistors in each stage circuit is reduced to decrease gate driver circuit size, then the gate driver circuit size decreases, but leakage current occurs due to threshold voltage changes
Solution Approach 1:
Instead of adding more transistors to prevent leakage current (conventional approach), the patent inverts the approach by using fewer transistors with optimized configurations. The stage circuits are designed to inherently prevent leakage current through proper signal propagation and voltage level management, achieving compact size without compromising reliability.
Solution Approach 2:
The gate driver circuit incorporates feedback mechanisms where output signals from one stage are used to control subsequent stages. This feedback ensures that transistors are properly turned off by monitoring and responding to voltage levels, preventing leakage current even with reduced transistor counts in each compact stage.
3Reliability
If the number of operations of a transistor increases, then the transistor characteristics change causing voltage drop, but reducing transistor operations limits circuit functionality
Solution Approach 1:
The patent implements preliminary reset operations and voltage level preparations before main switching operations. By pre-charging or pre-discharging nodes and setting appropriate initial voltage levels, the transistors operate within optimal characteristic ranges, preventing excessive voltage drops even with multiple operations, while maintaining full circuit functionality.
Data Source
AI summary
A gate driver circuit can include a plurality of stage circuits, in which each of the plurality of stage circuits supplies a gate signal to gate lines arranged in a display panel, and includes an M node, a Q1 node, a Q2 node, a QB node, a line selector, a Q1 node controller, a Q1 node stabilizer, an inverter, a QB node stabilizer, a carry signal output circuit portion, and a gate signal output circuit portion, in which a first low-potential voltage level, a third low-potential voltage level, and a fourth low-potential voltage level for operating the gate driver circuit are set to different values, and the gate driver circuit can have a reduced size and better prevent leakage current while also providing more stable gate signals.