Display Panel ESD Circuit for Re-Charged Ground Line Discharge
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Solution Overview
Problem
Display panels face defects due to re-charged static electricity in the ground line of the substrate, which is not properly discharged, leading to input of static electricity into multiple display panels.
Innovation Solution
A display device with an electrostatic protection circuit in the non-display area, comprising multiple stage circuits with diodes, capacitors, and resistors, that sequentially reduce the voltage of static electricity input from the main ground line, allowing easy discharge to the common ground line.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If an electrostatic chuck is used to fix the substrate during deposition, then the substrate is securely held and aligned with the deposition mask, but static electricity may be re-charged in the ground line if proper contact is not maintained
Solution Approach 1:
The patent introduces an electrostatic protection circuit as an intermediary between the ground line and the substrate. This circuit includes a first electrostatic protection unit with a first transistor and a second electrostatic protection unit with a second transistor, which act as mediators to safely discharge static electricity before it can be re-charged in the ground line, while maintaining the substrate's stable positioning during deposition
2Ease of operation
If the substrate is held by electrostatic force, then adhesion and alignment are facilitated, but static electricity generated inside the display panel cannot be easily discharged to the substrate
Solution Approach 1:
The patent introduces an electrostatic protection circuit as an intermediary between the ground line and the substrate. This circuit includes a first electrostatic protection unit with a first transistor and a second electrostatic protection unit with a second transistor, which act as mediators to safely discharge static electricity before it can be re-charged in the ground line, while maintaining the substrate's stable positioning during deposition
3Reliability
If a multi-stage circuit with diodes, capacitors, and resistors is added to protect from static electricity, then display panel protection is improved, but device complexity increases
Solution Approach 1:
The patent divides the electrostatic protection function into multiple discrete units: a first electrostatic protection unit containing a first transistor, a second electrostatic protection unit containing a second transistor, and associated capacitors and resistors. This segmentation allows each component to perform a specific function in the static electricity discharge path, making the complex protection mechanism modular and manageable while ensuring comprehensive protection
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
Effectively protects the inside of the display panel from static electricity and facilitates easy discharge of static electricity generated inside the panel, preventing defects and ensuring reliable operation.
Implementation Method 1
a first stage circuit including a (1-1)-th diode which causes a forward current to flow from a first node to a second node
Implementation Method 2
a first capacitor and a first resistor connected in parallel to the (1-1)-th diode
Implementation Method 3
a first capacitor and a first resistor connected in parallel to the (1-1)-th diode
Implementation Method 4
Static electricity input to the first node experiences a voltage drop as the static electricity sequentially passes through the first, second, and third stage circuits, and then is discharged through the fourth node
Data Source
AI summary
Provided is a display device comprising a display panel including a display area and a non-display area and an electrostatic protection circuit disposed in the non-display area. The electrostatic protection circuit includes a first stage circuit including a (1-1)-th diode which causes a forward current to flow from a first node to a second node and a first capacitor and a first resistor connected in parallel to the (1-1)-th diode, a second stage circuit including a (2-1)-th diode which causes a forward current to flow from the second node to a third node and a second capacitor and a second resistor connected in parallel to the (2-1)-th diode, and a third stage circuit including a (3-1)-th diode which causes a forward current to flow from the third node to a fourth node and a third capacitor and a third resistor connected in parallel to the (3-1)-th diode.