Shift Register Unit for Dual Gate and Emission Control Signals
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Solution Overview
Problem
Existing shift register units in display technology cannot simultaneously provide gate driving signals and light emitting control signals, and they fail to maintain the output waveform due to the threshold voltage loss of the first output transistor.
Innovation Solution
The proposed shift register unit includes a first node potential adjustment circuit, tank circuits, node control circuits, and an output circuit, which allows for the generation of both gate driving signals and light emitting control signals by controlling the potential of various nodes and isolation nodes under the influence of clock signals and voltage signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the first output transistor is used to output the driving voltage signal, then the circuit structure is simple, but the output waveform has loss due to threshold voltage
Solution Approach 1:
The output circuit is divided into two separate output transistors: a first output transistor for outputting the gate driving signal and a second output transistor for outputting the light emitting control signal. This segmentation allows each transistor to be independently controlled, eliminating the threshold voltage loss problem that would affect a single transistor's output waveform accuracy.
Solution Approach 2:
A second node is introduced as an intermediary between the first isolation node and the output circuit. The second node control circuit controls the potential of this intermediary node, which in turn controls the second output transistor to output the light emitting control signal, thereby mediating the signal transmission to avoid threshold voltage loss.
2Area of stationary object
If a single shift register unit is used, then the device area is small, but it cannot simultaneously provide gate driving signals and light emitting control signals
Solution Approach 1:
The shift register unit is designed with multi-functionality to simultaneously provide both gate driving signals and light emitting control signals. By incorporating two output circuits with separate control mechanisms, a single shift register unit can perform multiple functions that would otherwise require separate units, thereby maintaining small device area while enhancing versatility.
Solution Approach 2:
The circuit employs dynamic control of node potentials through multiple control circuits that respond to different clock signals. The first node control circuit controls the first output transistor based on one clock signal, while the second node control circuit controls the second output transistor based on another clock signal, enabling dynamic and flexible signal output for different purposes from the same unit.
3Device complexity
If the first output transistor potential is not adjusted, then the control circuit is simple, but the transistor cannot turn on fully causing signal loss
Solution Approach 1:
The first node potential adjustment circuit provides feedback control by monitoring and adjusting the potential of the first node to ensure the first output transistor turns on fully. This feedback mechanism ensures reliable transistor switching performance by dynamically compensating for any potential issues that would prevent full turn-on.
Solution Approach 2:
The circuit performs preliminary action by pre-adjusting the potential of the first node through the first node control circuit and first node potential adjustment circuit before the first output transistor needs to switch. This preliminary potential adjustment ensures that when the transistor is activated, it can turn on fully and reliably without delay or signal loss.
Data Source
AI summary
The present disclosure provides a shift register unit, a driving method, a driving circuit and a display device. The shift register unit includes a first node potential adjustment circuit, a first tank circuit, a second node control circuit, a second tank circuit, a third node control circuit, a first node control circuit, and an output circuit; the first node potential adjustment circuit changes the potential of the first node according to the adjustment clock signal under the control of the potential of the first node; the first tank circuit is used to maintain the potential of the first node; the third node control circuit controls the potential of the third isolation node and the potential of the fourth node; the second node control circuit controls the potential of the second isolation node.