OLED Touch Display ESD Circuit for Static Charge Protection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Display devices, particularly organic light emitting diode (OLED) devices, are prone to electrostatic defects and reduced touch sensitivity due to static electricity accumulation in touch sensing units, which can damage internal components and affect performance.
Innovation Solution
Incorporating an electrostatic discharge circuit connected to touch link lines in the non-display area of the display device to discharge static electricity externally, thereby protecting internal elements and maintaining touch sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a touch sensing unit is added to the display device, then touch sensitivity is improved, but static electricity accumulation occurs causing electrostatic defects
Solution Approach 1:
An electrostatic discharge circuit is introduced as an intermediary component between the touch sensing unit and ground. This circuit includes a discharge transistor that activates when static electricity accumulates in the touch sensing unit, providing a controlled discharge path to ground and preventing electrostatic damage to internal components
Solution Approach 2:
The electrostatic discharge circuit is designed to proactively discharge static electricity before it can cause damage. The discharge transistor is configured to automatically activate when voltage thresholds are exceeded, performing preliminary protection against potential electrostatic defects before they occur
2Reliability
If the electrostatic discharge circuit is added to protect from static electricity, then reliability is improved, but device complexity increases
Solution Approach 1:
The electrostatic discharge circuit shares infrastructure with existing display device components. The discharge transistor utilizes the same pixel electrode structure and is integrated into the existing driving circuitry, allowing the protection function to be achieved without adding completely separate components or significantly increasing device complexity
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
The electrostatic discharge circuit effectively prevents damage from static electricity, enhancing the reliability and touch sensitivity of the display device by safely dissipating static charges.
Implementation Method 1
an electrostatic discharge circuit disposed in the non-display area and connected to the touch link line... static electricity accumulated in the touch sensing unit is easily discharged to the outside
Data Source
AI summary
A display device includes substrate including a display area and a non-display area; an organic light emitting diode disposed on the substrate; an encapsulation layer disposed on the organic light emitting diode; a touch sensing unit disposed on the encapsulation layer in the display area; a plurality of pads disposed in the non-display area; a plurality of touch link lines disposed in the non-display area and each directly connected to the touch sensing unit; and an electrostatic discharge circuit disposed in the non-display area, wherein the non-display area includes a bending area and a pad area, and wherein the electrostatic discharge circuit is disposed between the bending area and the pad area.