OLED Conductive Wire Heat Blocking Film
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Solution Overview
Problem
In organic light emitting diode (OLED) displays, conductive wires overlapping the sealant can be melted by laser curing, leading to short circuits, which is a durability and defect issue.
Innovation Solution
Incorporating a heat blocking film with a triple film structure, including silver or ITO/Ag/ITO, between the conductive wires and the sealant, and using short circuit blocking films with a double or single film structure to prevent melting and electrical contact between conductive wires during laser curing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the sealant is cured by irradiating with laser, then the sealant coheres the display substrate and the sealing member, but the conductive wire may be melted and a short circuit may occur
Solution Approach 1:
A heat blocking film is introduced as an intermediary layer between the conductive wire and the sealant. This film blocks heat from the laser-cured sealant from reaching the conductive wire, preventing melting while maintaining the sealing function. The heat blocking film acts as a thermal barrier that mediates between the heat-generating sealant and the heat-sensitive conductive wire.
Solution Approach 2:
The heat blocking film employs a composite structure consisting of multiple layers with different materials and functions. The composite structure includes a lower blocking film made of the same material as the conductive wire (such as aluminum, chromium, molybdenum, titanium, tantalum, or their alloys) and an upper blocking film made of transparent conductive material (such as ITO, IZO, or ZnO). This composite design provides both heat blocking capability and electrical conductivity where needed.
2Reliability
If a heat blocking film including silver is used between the conductive wire and the sealant, then the conductive wire is protected from heat, but the complexity of the structure increases
Solution Approach 1:
The heat blocking film uses a composite structure with a lower blocking film made of the same material as the conductive wire (such as aluminum, chromium, molybdenum, titanium, tantalum, or their alloys) and an upper blocking film made of transparent conductive material (such as ITO, IZO, or ZnO). This composite design provides both heat blocking capability and electrical conductivity where needed, while maintaining compatibility with existing manufacturing processes.
Solution Approach 2:
The heat blocking film serves multiple functions simultaneously: it blocks heat from the laser-cured sealant, maintains electrical conductivity in the conductive wire, and provides a barrier against moisture and oxygen. The upper blocking film's transparency allows it to function as both a heat blocker and an optical element that does not interfere with display performance.
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 solution effectively prevents short circuits and enhances the durability of conductive wires by blocking heat and moisture, thereby improving the reliability of OLED displays.
Implementation Method 1
a heat blocking film between the conductive wire and the sealant, the heat blocking film including a plurality of sub-heat blocking films
Implementation Method 2
The sealant may adhere and seal the display substrate and the sealing member by irradiating a laser thereon to cure the sealant
Implementation Method 3
at least one short circuit blocking film between the plurality of conductive wires
Data Source
AI summary
An organic light emitting diode (OLED) display including a display substrate; a sealing member facing the display substrate; a sealant between the display substrate and the sealing member, the sealant cohering the display substrate and the sealing member; a plurality of conductive wires on the display substrate and overlapping the sealant; and a heat blocking film between the conductive wire and the sealant, the heat blocking film including a plurality of sub-heat blocking films.