Shift Register Element Feedback Regulation for Display Panel Stability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current shift register elements in display technologies face stability issues due to short-circuit currents and potential fluctuations, which affect the overall performance and reliability of gate driver circuits.
Innovation Solution
A shift register element design incorporating an output module, drivers, and a feedback regulation module to control node voltages and stabilize the circuit, using transistors and capacitors to manage clock signals and output terminals effectively, thereby reducing potential fluctuations and improving stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional 5T2C shift register element structure is used, then the device complexity is reduced, but short-circuit current is generated causing stability deterioration
Solution Approach 1:
The patent introduces a feedback regulation module that includes a seventh transistor T7, an eighth transistor T8, a ninth transistor T9, and a third capacitor C3. This feedback mechanism monitors the output signal and adjusts the first node N1 voltage accordingly, preventing short-circuit currents and stabilizing the circuit operation without requiring a complete redesign of the basic shift register structure.
Solution Approach 2:
The shift register element is divided into distinct functional modules: a first driver module (T1, T2, C2) controlling the second node N2, a second driver module (T3, T4) controlling the third node N3, and a feedback regulation module (T7, T8, T9, C3) regulating the first node N1. This segmentation allows each module to be optimized independently while working together to eliminate short-circuit currents.
2Reliability
If feedback regulation is added to control node voltages, then circuit stability is improved, but device complexity increases
Solution Approach 1:
The feedback regulation module serves multiple functions simultaneously: it regulates the voltage of the first node N1, prevents short-circuit currents during switching transitions, and ensures stable output signals. By combining these functions into a single integrated module, the patent achieves improved voltage stability without proportionally increasing device complexity.
3Ease of manufacture
If all transistors are P-type as in traditional design, then manufacturing is simplified, but short-circuit current occurs during clock signal transitions
Solution Approach 1:
The patent maintains P-type transistors for most positions in the circuit where they provide adequate performance, but strategically introduces N-type transistors in specific locations within the feedback regulation module (T7, T8, T9) where their different electrical characteristics help prevent short-circuit currents during clock signal transitions. This localized differentiation resolves the harmful effect while minimizing impact on manufacturing complexity.
Data Source
AI summary
Disclosed are a shift register element, a method for driving the same, and a display panel. The method includes: an output module including a first node and a third node, wherein the output module is configured to provide an output terminal with a signal of a first signal terminal or a second signal terminal according to voltage applied to the first node and the third node; a first driver configured to control the voltage of the first node, and voltage of a second node according to signals of the first input terminal and the second input terminal; a second driver configured to control voltage of the third node according to the voltage of the first node and the second node; and a feedback regulation module configured to control voltage of the first node according to the signal of the output terminal, and signals of a third input terminal and a fourth input terminal.