LED Pixel Repair Structure Using Sub-LED Backup Electrodes
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Solution Overview
Problem
Light emitting diode (LED) display devices face issues with deteriorated pixels leading to decreased display quality, increased fabrication costs, and low process efficiency due to the need for removing and replacing deteriorated LEDs, which complicates the manufacturing process and requires additional redundancy LEDs.
Innovation Solution
The implementation of a sub-LED connected to the first and second connecting electrodes over a deteriorated LED, allowing for continued operation without removing the deteriorated LED, thereby preventing display quality deterioration and reducing fabrication costs and process complexity by eliminating the need for additional redundancy LEDs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a process of removing deteriorated LED and replacing with normal LED is performed, then display quality is maintained, but process efficiency decreases and fabrication cost increases
Solution Approach 1:
The invention divides the LED structure into a main LED and a sub-LED that can operate independently. When the main LED deteriorates, the sub-LED continues to emit light, maintaining display quality without requiring removal or replacement processes.
Solution Approach 2:
The sub-LED is pre-formed and positioned alongside the main LED during the initial fabrication process. This preliminary arrangement ensures that when the main LED fails, the sub-LED is already in place and connected to the driving circuitry, eliminating the need for subsequent removal and replacement operations.
2Reliability
If redundancy LED is formed to replace deteriorated LED, then display quality is maintained, but fabrication cost increases
Solution Approach 1:
The sub-LED shares the same driving circuitry and substrate infrastructure as the main LED, merging resources to reduce fabrication costs. The sub-LED uses the same connecting electrodes and transistor connections, eliminating the need for separate redundancy LED formation processes and additional conductive lines.
Solution Approach 2:
The sub-LED structure is designed to serve dual purposes: it acts as a secondary light-emitting element during normal operation and serves as a backup when the main LED deteriorates. This multi-functionality eliminates the need for dedicated redundancy components, reducing fabrication costs.
3Adaptability or versatility
If additional conductive line is formed for redundancy LED, then deteriorated LED can be replaced, but device complexity increases
Solution Approach 1:
The sub-LED shares the same connecting electrodes and transistor connections as the main LED, merging the electrical pathways. This integration eliminates the need for additional conductive lines and simplifies the overall device structure while maintaining replacement capability.
Solution Approach 2:
The sub-LED is designed to automatically take over when the main LED deteriorates by sharing the same driving circuitry. The system self-regulates by directing current to the functional LED (sub-LED) when the main LED fails, eliminating the need for complex switching mechanisms or additional control lines.
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
This solution enhances process efficiency, reduces fabrication costs, and improves light emission efficiency, resulting in a high-resolution display with improved luminance without the need for removing deteriorated LEDs, thus maintaining display quality and increasing subpixels per unit area.
Implementation Method 1
a sub LED on the first LED, the sub LED electrically connected to the first thin film transistor and including a reflecting layer reflecting a light toward a direction opposite to the first LED
Data Source
AI summary
The present disclosure relates to an LED display device, and more particularly, to an LED display device including a repair structure for a deteriorated pixel. In the present disclosure, a sub LED electrically coupled to first and second connecting electrodes for applying a voltage to a LED is disposed on a deteriorated LED. Thus, deterioration of a display quality due to a deteriorated pixel is prevented. Since it is not required to remove a deteriorated LED, a fabrication cost is reduced and a process efficiency is improved.