Display Device Defective Sub-Pixel Repair via Welding
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Solution Overview
Problem
Display devices face challenges in efficiently preventing bright spot defects and abnormal driving in defective sub-pixels, requiring complex repair processes that complicate the structure and functionality.
Innovation Solution
A display device design that allows for the easy connection of a light emitting element of a defective sub-pixel to a normal sub-pixel's pixel circuit through a single welding process using a reflector and capacitor, simplifying the repair by short-circuiting the defective sub-pixel's capacitor electrodes and connecting the reflectors of adjacent sub-pixels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional repair processes are used for defective sub-pixels, then the defect can be addressed, but the structure and functionality become complicated
Solution Approach 1:
The patent merges the repair functions for different types of defects (bright spot prevention and abnormal driving correction) into a single integrated welding process. By combining the capacitor short-circuiting operation and the reflector connection operation into one simultaneous process, the repair structure is simplified while maintaining comprehensive defect coverage
Solution Approach 2:
The welding process is designed to perform multiple functions simultaneously: it short-circuits the capacitor electrodes to prevent bright spot defects, connects the reflector to the cathode to correct abnormal driving, and establishes electrical connections for signal transmission. This multi-functional approach eliminates the need for separate repair processes for different defect types
2Ease of repair
If multiple welding processes are used to repair defective sub-pixels, then comprehensive repair can be achieved, but the manufacturing process becomes more complex
Solution Approach 1:
The patent combines multiple repair operations into a single welding process that simultaneously short-circuits capacitor electrodes and connects reflectors to cathodes. This merging of operations simplifies the manufacturing process by reducing the number of discrete welding steps required while maintaining comprehensive repair capability
Solution Approach 2:
The reflector is pre-positioned and configured during manufacturing to enable automatic connection to the cathode through the welding process. The capacitor electrodes are pre-arranged in a configuration that allows simultaneous short-circuiting in the same welding operation, eliminating the need for subsequent adjustment or separate connection steps
3Reliability
If complex repair structures are implemented, then defective sub-pixels can be repaired, but additional structural complexity is introduced
Solution Approach 1:
The patent merges the capacitor and reflector into an integrated repair structure where both components are addressed through a single welding operation. The capacitor electrodes are positioned to allow simultaneous short-circuiting, and the reflector is configured to connect to the cathode in the same process, eliminating the need for separate structural elements for each repair function
Solution Approach 2:
The welding structure is designed to serve multiple repair functions simultaneously: preventing bright spot defects through capacitor short-circuiting, correcting abnormal driving through reflector connection, and establishing electrical signal paths. This universal design eliminates the need for separate structural components dedicated to each specific repair function
Data Source
AI summary
A display device includes a substrate on which a plurality of sub-pixels including at least one defective sub-pixel are defined; a light emitting element disposed in each of the sub-pixels; a driving transistor disposed in each of the sub-pixels and having a source electrode connected to a cathode of the light emitting element; a capacitor disposed in each of the sub-pixels and connected between a gate electrode and the source electrode of the driving transistor; and a reflector disposed in each of the sub-pixels and electrically connected to the cathode. In the defective sub-pixel, the gate electrode and the source electrode of the driving transistor are electrically connected through the capacitor. Accordingly, according to the present disclosure, the defective sub-pixel can be easily darkened or blackened by performing a welding process on a capacitor including a plurality of electrodes spaced apart from each other in the defective sub-pixel.