Shift Register Pull-Down Module Leakage Suppression
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Solution Overview
Problem
Display panels experience output abnormalities in high-temperature and high-humidity environments due to leakage currents in shift register units, affecting display quality.
Innovation Solution
Incorporating a pull-down module and pull-down control module in shift register units, with a transistor that is turned on during the scanning phase and off during the non-scanning phase to prevent leakage currents, ensuring the scanning signal is maintained at the disable level.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional shift register unit is used in high-temperature and high-humidity environment, then the device complexity remains low, but the reliability deteriorates due to leakage currents causing output abnormalities
Solution Approach 1:
The shift register unit is segmented into functional modules: a pull-down module (with first and second transistors) and a control module. This segmentation allows each module to perform a specific function - the pull-down module handles leakage current suppression while the control module manages scanning signal output, thereby improving reliability without excessive complexity
Solution Approach 2:
The first transistor in the pull-down module acts as an intermediary element that actively suppresses leakage currents between nodes. By introducing this intermediary component, the patent prevents harmful leakage effects from degrading the output signal, thus enhancing reliability in high-temperature and high-humidity environments
2Reliability
If the transistor is kept on continuously to maintain signal level, then the signal integrity is maintained, but the energy consumption increases and leakage currents worsen in high-temperature environments
Solution Approach 1:
The first transistor in the pull-down module operates periodically rather than continuously - it is turned on during the non-scanning phase to suppress leakage currents and turned off during the scanning phase to reduce power consumption. This periodic operation maintains signal integrity while minimizing energy consumption and leakage effects
Solution Approach 2:
The pull-down module performs preliminary anti-action by preemptively suppressing leakage currents during the non-scanning phase before they can accumulate and cause output abnormalities. This preventive approach maintains signal integrity without requiring continuous transistor operation, thus reducing power consumption
Data Source
AI summary
Provided are a display panel, a method for the same and a display device. In the display panel, in a same shift register unit of a shift register circuit, a pull-down module is electrically connected to a first node, a second node, a first level signal terminal, and a signal output terminal separately. The pull-down module transmits a first level signal of the first level signal terminal to the second node and the signal output terminal under the control of a potential of the first node. The pull-down module includes at least a first transistor. A gate of the first transistor is electrically connected to the first node; the pull-down control module is electrically connected to the first node and the scanning control terminal separately; and the pull-down control module controls a scanning control signal of the scanning control terminal to be transmitted to the first node.