Gate Driving Circuit Segmented Gate-Off Voltages
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Solution Overview
Problem
In organic light emitting display devices, leakage current through switch elements in an off state can discharge voltage from capacitors, leading to decreased luminance and holding characteristics of pixels.
Innovation Solution
A gate driving circuit is designed with (N-1)th and Nth signal transmitters that apply specific gate-on and gate-off voltages to output scan pulses, with the first gate-off voltage being higher or lower than the second, to control switch elements and prevent leakage current.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single gate-off voltage is applied to switch elements, then the circuit structure is simple, but leakage current occurs causing decreased luminance and holding characteristics
Solution Approach 1:
The gate-off voltage is segmented into two distinct levels: a first gate-off voltage applied to a first switch element and a second gate-off voltage applied to a second switch element. This segmentation allows each switch element to be optimized for its specific function, preventing leakage current in the capacitor-connected switch while maintaining proper operation in the other switch, thereby resolving the contradiction between reliability and device complexity.
Solution Approach 2:
Different gate-off voltages are applied to different switch elements based on their specific requirements. The first switch element connected to the capacitor receives a gate-off voltage that minimizes leakage current, while the second switch element receives a different gate-off voltage optimized for its switching function. This local quality approach ensures optimal performance for each component without requiring complete system redesign.
2Reliability
If leakage current is prevented by optimizing switch element voltages, then luminance and holding characteristics improve, but the gate driving circuit complexity increases
Solution Approach 1:
The signal transmitter dynamically selects and applies different gate-off voltages to different switch elements based on their operational requirements. The controller within the signal transmitter manages the dynamic assignment of voltage levels, allowing the system to adapt to the specific needs of each switch element while maintaining a unified circuit architecture, thus balancing reliability improvement with acceptable circuit complexity.
Data Source
AI summary
Provided are a gate driving circuit and a display device including the same. The gate driving circuit includes a first outputter for outputting a first scan pulse that swings between a gate-on voltage and a first gate-off voltage, a second outputter for outputting a second scan pulse that swings between the gate-on voltage and a second gate-off voltage, and a controller for controlling the first and second outputters. The first gate-off voltage is set to be higher or lower than the second gate-off voltage.