Micro LED TFT Cutting Pathway for Static Discharge Protection
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Solution Overview
Problem
Static electricity generated during the manufacturing process of micro LED displays can damage TFT layers, leading to dot errors and reduced image quality due to uncontrolled ON or OFF states of light-emitting elements, which are difficult and costly to repair.
Innovation Solution
Incorporation of sacrificial switching elements connected in parallel to TFT electrodes, with transparent cutting areas allowing laser cutting to separate damaged elements and prevent static electricity from reaching pixel circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sacrificial switching elements are added to absorb static electricity, then reliability of TFT layer is improved, but device complexity increases
Solution Approach 1:
The patent employs sacrificial switching elements that are intentionally designed to be temporary protective components. These elements are placed in parallel with the pixel circuit and are meant to be damaged or destroyed by static electricity discharges, thereby protecting the main pixel circuit. After serving their protective function, these sacrificial elements can be identified and replaced or the affected area can be reworked, allowing the main display functionality to remain intact.
2Ease of repair
If transparent cutting areas are created for laser access, then ease of repair is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent divides the protective insulating film into different regions: a first insulating film region that covers the pixel circuit and a second insulating film region that forms transparent cutting areas. This segmentation allows the laser beam to access the sacrificial switching element through the transparent region without interfering with the protected pixel circuit, enabling precise repair operations while maintaining manufacturing feasibility.
3Reliability
If sacrificial switching elements are placed close to pixel circuits for protection, then reliability is improved, but manufacturing complexity increases
Solution Approach 1:
The patent introduces transparent cutting areas as intermediary access points that facilitate the placement and connection of sacrificial switching elements. These transparent regions in the insulating film allow laser beams to reach and cut the sacrificial elements positioned near the pixel circuits, enabling precise placement and connection processes while maintaining the protective function. This intermediary structure simplifies the manufacturing process by providing clear access paths for laser-based operations.
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 TFT layer damage by absorbing static electricity, maintaining image quality by ensuring light-emitting elements can be controlled, and allows for efficient repair of faulty pixels without costly repairs.
Implementation Method 1
the cutting area may have a transparency such that a laser beam passes through the cutting area
Data Source
AI summary
A display module includes a thin film transistor (TFT) substrate including a glass substrate, a TFT layer provided on the glass substrate, and a plurality of TFT electrodes provided on the TFT layer; and a plurality of light-emitting diodes (LEDs) electrically connected to the plurality of TFT electrodes, wherein the TFT layer includes a plurality of sacrificial switching elements connected to the plurality of LEDs in parallel and configured to absorb static electricity generated at the TFT layer.