Shift Register Unit Multi-Pulse Output for AMOLED Gate Driving
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Solution Overview
Problem
Existing shift register units can only generate a shift signal with a single pulse, which is insufficient for driving AMOLED and LCD panels that require multiple pulses for proper operation.
Innovation Solution
A shift register unit comprising an output module, an unset module, and an unset control module, where the unset module is controlled to prevent unsetting a node, allowing the output module to produce a shift signal with multiple pulses by turning off the unset module under a control signal, and a gate driving circuit incorporating multiple such units with opposing clock signal phases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional shift register unit is used, then the circuit structure is simple, but it can only generate a shift signal with a single pulse, which is insufficient for driving AMOLED and LCD panels that require multiple pulses
Solution Approach 1:
The shift register unit is divided into distinct functional modules: an output module for generating the shift signal, an unset module for resetting the node, and an unset control module for controlling the unset operation. This segmentation allows each module to perform its specific function independently, enabling multi-pulse output while maintaining clear functional separation and manageable complexity
Solution Approach 2:
The unset module is dynamically controlled by the unset control module based on the output state of the output module. When the output module completes a pulse output, the unset control module activates the unset module to reset the node, preparing it for the next pulse. This dynamic control mechanism enables continuous multi-pulse generation without requiring a completely new circuit architecture
2Productivity
If the unset module continuously unsets the node, then the circuit operation is simple, but the output signal can only have a single pulse
Solution Approach 1:
The unset control module receives feedback from the output module regarding the completion of each pulse output. Based on this feedback, the unset control module precisely controls when to activate the unset module, ensuring that the node is reset only after a pulse is completed. This feedback mechanism enables automatic multi-pulse generation without requiring external intervention for each pulse
Solution Approach 2:
The shift register unit operates in periodic cycles: the output module generates a pulse, then the unset control module activates the unset module to reset the node, preparing it for the next pulse. This periodic alternation between pulse generation and node resetting continues automatically, producing a sequence of multiple pulses without complicating the operational control
Data Source
AI summary
The present invention discloses a shift register unit and method for driving it, and a gate driving circuit. The shift register unit comprises an output module, an unset module and an unset control module; wherein a control terminal of the output module, an output terminal of the unset module are connected to a first node; an output terminal of the unset control module is connected to a control terminal of the unset module; the unset module is configured to be turned off under the control of a control signal accessed to a control terminal of the unset control module so as to prevent the unset module from unsetting the first node, such that the output module outputs a shift signal having multiple pulses during the period in which the unset module is turned off.