Shift Register Node Control for Stable Scanning Outputs
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Solution Overview
Problem
Scanning driving circuits in displaying devices face issues with output instability due to the instability of the output terminal in shift registers.
Innovation Solution
A shift register design that includes specific inputting and outputting circuits controlled by nodes and clock signals, along with controlling circuits to manage voltage connections, ensuring stable output signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional shift register is used in a scanning driving circuit, then the circuit structure is simple, but the output terminal exhibits instability
Solution Approach 1:
The shift register is divided into multiple functional modules: a first outputting circuit (including first and second transistors) and a second outputting circuit (including third and fourth transistors), each responsible for different output states. This segmentation allows independent optimization of each module to ensure stable output signals while managing circuit complexity through modular design.
Solution Approach 2:
Different transistor configurations are applied at different locations within the shift register to achieve specific functions. The first outputting circuit uses a transistor arrangement optimized for one output state, while the second outputting circuit uses a different arrangement for the opposite state. This local differentiation ensures stable output signals without requiring complete redesign of the entire circuit.
2Reliability
If the output terminal is controlled by a single circuit, then the device complexity is low, but the output signal stability deteriorates
Solution Approach 1:
The first outputting circuit and second outputting circuit are merged into a unified output structure that shares common elements (such as the output terminal and control nodes) while providing complementary functions. This merging ensures that at least one circuit is always in a stable state, guaranteeing output signal stability without duplicating the entire circuit.
Solution Approach 2:
Control nodes (first node and second node) act as intermediaries between the input signals and the output circuits. These nodes coordinate the switching between the first and second outputting circuits, ensuring smooth transitions and maintaining output stability. The intermediary nodes prevent direct conflicts between the two circuits while managing their cooperative operation.
Data Source
AI summary
The present application relates to a shift register, a scanning driving circuit and a displaying device. The shift register includes a first inputting circuit, a first outputting circuit, a second inputting circuit, a second outputting circuit and a second controlling circuit. The second controlling circuit is electrically connected to a first node, a second node, a fifth voltage terminal, a second clock-signal terminal and a controlling terminal. The second controlling circuit is configured for, under the control of the signal of the second node, the control of a second clock signal and the control of the signal of the controlling terminal, when the first outputting circuit is switched on, disconnecting the electric connection between the first node and the fifth voltage terminal, and when the second outputting circuit is switched on, writing the signal of the fifth voltage terminal into the first node.