Electrostatic Protection Circuit for Display Panels
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Solution Overview
Problem
Existing display technologies suffer from poor display quality due to sudden voltage changes on driving lines and common electrode traces, leading to large leakage currents and voltage fluctuations.
Innovation Solution
An electrostatic protection circuit with a switch control unit and two electrostatic storage units, connected to driving lines and common electrode traces, which controls charge equalization to prevent leakage currents and voltage fluctuations by switching on transistors when voltage variations exceed predetermined values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an electrostatic protection circuit is used to release electrostatic charges, then the threshold voltage drift and short circuit problems are reduced, but the device complexity increases
Solution Approach 1:
The patent introduces a protective electrode as an intermediary element between the gate electrode and source/drain electrode. This protective electrode acts as a mediator to detect and release accumulated electrostatic charges before they cause breakdown of the insulating medium film, thereby preventing short circuits and threshold voltage drift without requiring complex circuit modifications
Solution Approach 2:
The protective electrode is positioned to detect accumulated electrostatic charges before they reach critical levels that would cause insulating medium film breakdown. By performing preliminary detection and charge release, the system prevents catastrophic failures before they occur, maintaining reliability without adding complex real-time monitoring circuits
2Reliability
If charges are accumulated on data scanning line or gate scanning line, then the electrostatic protection function is enhanced, but breakdown of insulating medium film occurs resulting in short circuit
Solution Approach 1:
The protective electrode serves as an intermediary that safely channels accumulated electrostatic charges away from the gate electrode and source/drain electrode. It provides a controlled path for charge dissipation that prevents uncontrolled breakdown of the insulating medium film, thereby maintaining electrostatic protection without causing harmful short circuits
Solution Approach 2:
The protective electrode provides beforehand cushioning by absorbing and redistributing electrostatic charges before they can accumulate to dangerous levels. This preemptive charge management cushions the system against potential insulating medium film breakdown, allowing electrostatic charges to be managed safely without causing harmful effects
3Speed
If voltage on driving line or common electrode trace suddenly changes, then the electrostatic discharge response is improved, but large leakage current occurs affecting voltage stability
Solution Approach 1:
The protective electrode acts as an intermediary that mediates the discharge of electrostatic charges between the driving line and common electrode trace. It provides a controlled discharge path that prevents sudden, large leakage currents while maintaining fast response to electrostatic events, thereby balancing speed and voltage stability
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Prevents leakage currents from flowing between driving lines and common electrode traces, thereby stabilizing voltages and improving display quality by effectively managing electrostatic discharges.
Implementation Method 1
a first electrostatic storage unit configured to store charges and a second electrostatic storage unit configured to store charges
Implementation Method 2
the switch control unit is configured to control the second terminal of the first electrostatic storage unit to be connected to the common electrode trace when a voltage variation value of a voltage on the driving line during a predetermined time period is greater than a first predetermined voltage variation value
Data Source
AI summary
An electrostatic protection circuit, a display panel, and a display apparatus are disclosed. The electrostatic protection circuit comprises a switch control unit, a first electrostatic storage unit configured to store charges, and a second electrostatic storage unit configured to store charges, wherein the first electrostatic storage unit has a first terminal connected to a driving line and a second terminal connected to the switch control unit, and the second electrostatic storage unit has a first terminal connected to the switch control unit and a second terminal connected to a common electrode trace. With the first electrostatic storage unit connected to the driving line and the second electrostatic storage unit connected to the common electrode trace, the electrostatic protection circuit, the display panel, and the display apparatus according to the present disclosure can prevent leakage current on the driving line from flowing into the common electrode trace or prevent leakage current on the common electrode trace from flowing into the driving line after the switch control unit is switched off, which otherwise causes voltage fluctuation on the driving line or the common electrode trace thereby affecting the display quality.