Gate Driving Circuit With Separated Nodes for Leakage Control
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Solution Overview
Problem
Current leakage in gate drivers of display devices leads to a decrease in the driving margin of gate signals, compromising the reliability of the display device.
Innovation Solution
A gate driving circuit design that includes a stage with separated intermediate nodes between transistors in sensing and pull-up control portions, preventing current leakage and maintaining voltage levels of gate signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If intermediate nodes between transistors in sensing and pull-up control portions are shared, then device complexity is reduced, but current leakage occurs and voltage level decreases
Solution Approach 1:
The patent divides the shared intermediate node into separate dedicated nodes: a first intermediate node for the sensing portion and a second intermediate node for the pull-up control portion. This segmentation prevents current leakage by isolating the current paths of the two portions while maintaining their functional independence.
2Reliability
If intermediate nodes are separated to prevent current leakage, then reliability is improved, but device complexity increases
Solution Approach 1:
The patent segments the intermediate nodes into separate entities dedicated to specific functions (sensing vs. pull-up control). This segmentation prevents current leakage while maintaining circuit simplicity by assigning each node a single purpose, avoiding the need for complex isolation mechanisms.
3Device complexity
If current leakage is allowed to occur, then device complexity remains low, but driving margin decreases and reliability worsens
Solution Approach 1:
By segmenting the intermediate nodes into separate dedicated nodes for sensing and pull-up control portions, the patent prevents current leakage that would otherwise reduce the driving margin of gate signals. This maintains voltage levels within the required range while keeping the circuit structure simple.
Data Source
AI summary
A gate driving circuit includes a stage which outputs a scan signal based on a scan clock signal, a voltage of a first node, and a voltage of a second node, and outputs a sensing signal based on a sensing clock signal, a voltage of the first node, and a voltage of the second node. The stage includes a second sensing portion including transistors electrically connected in series and a first pull-up control portion including transistors electrically connected in series, the transistors including control electrodes electrically connected to each other. A first intermediate node between the transistors of the second sensing portion is separated from a second intermediate node between the transistors of the first pull-up control portion.