Conductive Power Line Shielding for Laser-Sealed OLED Displays
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Solution Overview
Problem
Display devices, particularly those using organic light-emitting diodes, are prone to short-circuits or faults due to damage from heat during laser sealing, especially affecting power supply lines.
Innovation Solution
A conductive layer made of materials like silver, indium tin oxide, or aluminum is applied to the power supply lines to prevent heat damage during laser sealing, and the sealing portion overlaps this conductive layer to ensure bonding strength and prevent short-circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If laser irradiation is used to seal the substrates, then the display elements are protected from external air and moisture, but the power supply lines may be damaged by heat causing short-circuits
Solution Approach 1:
A conductive layer is introduced as an intermediary between the laser sealing process and the power supply lines. This conductive layer absorbs and dissipates the laser-induced heat, preventing direct thermal damage to the power supply lines while allowing the sealing process to proceed effectively
Solution Approach 2:
The conductive layer is formed on the power supply lines before the laser sealing process. This preliminary action prepares the power supply lines to withstand the subsequent laser irradiation by providing thermal protection in advance
2Strength
If the sealing portion is positioned to overlap power supply lines for strong bonding, then bonding strength is improved, but short-circuit faults may occur due to heat damage
Solution Approach 1:
The conductive layer serves as a protective intermediary that enables the sealing portion to overlap the power supply lines for strong bonding while preventing electrical short-circuits. The conductive layer material and structure are designed to dissipate heat and maintain electrical integrity during the sealing process
3Ease of manufacture
If conventional sealing without conductive layer protection is used, then manufacturing process is simpler, but hillock and warping phenomena occur on power supply lines
Solution Approach 1:
The conductive layer acts as a protective intermediary that prevents hillock and warping phenomena on power supply lines during laser sealing. This additional layer ensures manufacturing precision is maintained while the overall process remains feasible and manufacturable
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 conductive layer effectively prevents hillock or warping phenomena and short-circuits between power supply lines, enhancing the reliability and yield of the display device by protecting the power supply lines from heat-related damage during the sealing process.
Implementation Method 1
a conductive layer arranged on the power supply line... to prevent heat damage during laser sealing
Implementation Method 2
the first substrate and the second substrate may be bonded to each other by a sealing portion... through laser irradiation
Data Source
AI summary
A display device includes: a first substrate having a display area and a non-display area on one side of the display area; a second substrate arranged opposite the first substrate; a display element arranged on the display area, the display element including a pixel electrode, an intermediate layer arranged on the pixel electrode, and an opposite electrode arranged on the intermediate layer; a power supply line arranged on the non-display area; and a conductive layer arranged on the power supply line and including the same material as the pixel electrode.