Micro OLED Driving Circuit Shielding Against Electrostatic Discharge
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Solution Overview
Problem
Display devices using high-resolution micro OLEDs are prone to defects caused by electrostatic discharge, particularly in head-mounted displays for virtual and augmented reality applications.
Innovation Solution
Incorporating a shielding layer made of metal or inorganic materials over the driving circuit portion of the silicon substrate, which is electrically connected to a dummy pattern or guard ring pattern, to block electrostatic discharge and prevent it from reaching the circuitry.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a high-resolution micro OLED is used in a head-mounted display, then the display resolution and visual quality are improved, but the device becomes more susceptible to electrostatic discharge defects
Solution Approach 1:
A shielding layer is introduced as an intermediary component between the driving circuit portion and the electrostatic discharge. This shielding layer, positioned in the non-display area, acts as a mediator that intercepts and redirects electrostatic discharge away from the circuitry, thereby protecting the high-resolution micro OLED system without compromising its display performance
Solution Approach 2:
The shielding layer is positioned in advance in the non-display area to preemptively block electrostatic discharge before it can reach the driving circuit portion. This preliminary protective measure is integrated into the device structure during manufacturing, ensuring that electrostatic discharge is deflected before it can cause damage to the sensitive high-resolution display components
2Reliability
If the shielding layer is added to cover the driving circuit portion, then the protection against electrostatic discharge is improved, but the device complexity increases
Solution Approach 1:
The shielding layer is strategically positioned only in the non-display area where the driving circuit portion is located, rather than covering the entire device. This localized approach provides electrostatic discharge protection precisely where needed while minimizing the addition of structural complexity to the overall device design
Solution Approach 2:
The shielding layer is integrated with the existing device structure in the non-display area, merging the protective function with the structural framework. This integration approach allows the shielding layer to be incorporated without significantly increasing device complexity, as it utilizes the available space and structural elements already present in the head-mounted display design
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 shielding layer effectively prevents defects in the display device due to electrostatic discharge, ensuring reliable operation of the driving circuit and overall display performance.
Implementation Method 1
a shielding layer disposed on the driving circuit portion and covering the driving circuit portion in a plan view
Data Source
AI summary
A display device includes a silicon substrate including a display area including a light emitting element, and a pixel circuit portion which is inside the silicon substrate and connected to the light emitting element, and a non-display area which is adjacent to the display area. The non-display area includes a driving circuit portion which is inside the silicon substrate and through which an electrical signal is provided to the display area, and an electrostatic shielding layer covering the driving circuit portion.