Cascaded Shift Register Signal Stability Control
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Solution Overview
Problem
The stability of output signals from shift registers in display panels is compromised when the load on the output terminal is small, leading to waveform instability and potential signal loss during transmission, affecting the display effect of pixel arrays.
Innovation Solution
A display panel with a driving circuit comprising cascaded shift registers, where each shift register includes control units to manage nodes and voltage signals, ensuring signal stability through dual control mechanisms, including a first control unit for receiving input signals and a fourth control unit for managing the first node's signal in response to clock signals and voltage signals, thereby stabilizing the output signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a conventional shift register is used with small load on the output terminal, then the device complexity is reduced, but the output signal stability deteriorates
Solution Approach 1:
The shift register is divided into multiple control units (first control unit, second control unit, third control unit, fourth control unit) that operate independently but cooperatively. Each control unit manages specific nodes (first node, second node, third node) and voltage signals separately, allowing precise control of signal stability without requiring a completely complex register structure.
Solution Approach 2:
The invention dynamically changes voltage parameters by switching between first voltage signal (high-level) and second voltage signal (low-level) based on operational conditions. The third control unit selectively receives different voltage signals to generate output, and control units adjust node potentials accordingly, maintaining signal stability across varying load conditions without increasing structural complexity.
2Reliability
If dual control mechanisms are added to stabilize output signals, then the output signal stability is improved, but the device complexity increases
Solution Approach 1:
Multiple control units perform overlapping functions to ensure signal stability. The first and fourth control units both manage the first node, while the second control unit manages the second node and the third control unit generates output based on either the second node or third node. This multi-functional approach provides redundant control paths that stabilize signals without requiring entirely separate control systems.
Solution Approach 2:
The control units automatically adjust their operation based on the signals they receive. When the third control unit receives the first voltage signal, it controls the output based on the second node; when it receives the second voltage signal, it switches to controlling based on the third node. This self-adjusting mechanism maintains signal stability without requiring external intervention or complex coordination logic.
Data Source
AI summary
A display panel and a display device are provided. The display panel includes a driving circuit. The driving circuit includes N-level shift registers cascaded with each other, where N is greater than or equal to two. A shift register includes: a first control unit configured to receive an input signal and control a signal of a first node; a second control unit configured to receive a first voltage signal and control a signal of a second node; a third control unit configured to receive the first voltage signal and generate an output signal, or receive a second voltage signal and generate an output signal in response to a signal of a third node connected to the first node; and a fourth control unit configured to receive the second voltage signal and control the signal of the first node. The first and second voltage signals are high-level and low-level signals, respectively.