Display Gate-Drive Circuit With Precharge Leakage Control
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Solution Overview
Problem
The gate drive circuit in display devices experiences poor stability due to potential instability at certain nodes, affecting display performance.
Innovation Solution
The gate drive circuit incorporates a plurality of cascaded gate drive units with specific transistor configurations and layouts to manage potential changes, including pull-up, pull-down, feedback, and discharging modules, along with voltage stabilizing modules, to stabilize node potentials and prevent current leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional gate drive circuit is used, then the display device can operate, but the node potential stability is poor leading to current leakage and degraded display performance
Solution Approach 1:
The patent introduces a precharge transistor that performs preliminary charging of the node potential before the main switching operation. This preliminary action ensures that the node is pre-charged to the correct voltage level, preventing potential instability and current leakage during subsequent operations. The precharge transistor is controlled to activate before the main switching transistor, establishing a stable voltage foundation.
Solution Approach 2:
The patent introduces an intermediate control mechanism using a control transistor that mediates between the input signal and the main switching transistor. This intermediary component precisely controls the timing and voltage level transitions, ensuring that the main switching transistor operates only when the node potential is stable. The control transistor acts as a gatekeeper, preventing premature or unstable switching that could cause current leakage.
2Reliability
If the gate drive circuit uses simple transistor configuration, then the circuit complexity is low, but the potential stability at nodes is poor
Solution Approach 1:
The patent segments the gate drive circuit into distinct functional modules: a precharge module with a precharge transistor, a control module with a control transistor, and a main switching module. Each segment performs a specific function - the precharge transistor handles initial voltage establishment, the control transistor manages timing and signal coordination, and the main switching transistor executes the primary switching operation. This segmentation allows each component to be optimized for its specific role, improving overall potential stability while maintaining reasonable complexity through functional specialization.
Data Source
AI summary
The present application discloses a gate drive circuit and a display device. The gate drive circuit includes a plurality of cascaded gate drive units, in which one of the gate drive units includes a first layout, an input module and a pull-up module. By receiving a potential changeable signal by the gate of a first transistor or the gate of a second thin-film transistor, it can alleviate or avoid current leakage caused when a first node keeps at a same voltage level for a long time, thereby improving the stability of the potential of the first node.