Touch-Sensing Display Layout With Integrated ESD Circuit
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Solution Overview
Problem
Display devices, particularly organic light emitting diode (OLED) displays, are susceptible to electrostatic defects and reduced touch sensitivity due to static electricity accumulation in touch sensing units, which can damage internal components and affect reliability.
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
1Adaptability or versatility
If a touch sensing unit is added to enable touch input functionality, then user interaction capability is improved, but static electricity accumulation occurs that can damage internal components
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 electrode, providing a safe discharge path that protects internal components while preserving touch functionality
Solution Approach 2:
The electrostatic discharge circuit is configured to proactively discharge static electricity before it can accumulate to damaging levels. The discharge transistor is designed to activate automatically when voltage thresholds are reached, preventing static buildup that could harm sensitive components
2Device complexity
If the display device structure is simplified without additional protective circuits, then device complexity is reduced, but electrostatic defects and reliability issues increase
Solution Approach 1:
The electrostatic discharge circuit shares infrastructure with existing display device components. The discharge transistor uses the same pixel electrode structure and connects to existing ground references, allowing electrostatic protection functionality to be added without proportionally increasing overall 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 discharging accumulated static charges.
Implementation Method 1
an electrostatic discharge circuit disposed in the non-display area and connected to the touch link line. In this case, because the electrostatic discharge circuit is 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.