LED Connection Electrode Layout to Minimize Display Short Defects
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Solution Overview
Problem
Existing display devices face challenges in minimizing or reducing short defects between electrodes, which can lead to reduced reliability and increased power consumption.
Innovation Solution
A display device is designed with self-alignment of first and second connection electrodes to light emitting diodes, using planarization layers to enclose side surfaces of the LEDs and separate areas with torn passivation films, thereby minimizing short defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If connection electrodes are positioned close to light emitting diodes to reduce power consumption, then power consumption is reduced, but short defects between electrodes increase
Solution Approach 1:
An insulating film is introduced as an intermediary between the connection electrode and the light emitting diode. This insulating film allows the electrode to be positioned close to the LED for low-power operation while preventing direct contact that would cause short defects. The insulating film acts as a mediator that enables both proximity for energy efficiency and electrical isolation for reliability.
2Reliability
If alignment processes are added to precisely position connection electrodes, then short defects are reduced, but manufacturing complexity increases
Solution Approach 1:
The insulating film is formed in advance before the connection electrode is deposited. This preliminary action creates a pre-defined isolation structure that automatically prevents short defects without requiring complex alignment processes during electrode positioning. The preliminary formation of the insulating film simplifies the overall manufacturing process while ensuring reliability.
3Area of stationary object
If connection electrodes are placed closer together to reduce device area, then area is reduced, but short defects increase
Solution Approach 1:
The insulating film serves as a space-efficient mediator that enables close positioning of connection electrodes to reduce device area while maintaining electrical isolation. By using the insulating film as the separation mechanism rather than requiring large spacing, the design achieves compact area with maintained reliability.
Data Source
AI summary
Provided is a display device. The display device includes a substrate including a plurality of sub pixels, a plurality of light emitting diodes which is disposed on the substrate in the plurality of sub pixels and each includes a first electrode and a second electrode disposed in a position higher than the first electrode, a first planarization layer which is disposed on the substrate so as to enclose a part of side surfaces of the plurality of light emitting diodes, a plurality of first connection electrodes which is disposed on the first planarization layer and is connected to the first electrode; a second planarization layer disposed on the first planarization layer and the plurality of first connection electrodes, and a plurality of second connection electrodes which is disposed on the second planarization layer and is connected to the second electrode. Therefore, the short defect may be minimized or reduced.