Organic Light Emitting Display Sealing Spacer for Test Wiring Protection
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Solution Overview
Problem
The existing methods for testing organic light emitting displays in a sheet unit are inefficient due to damage of the test wiring caused by electrostatic forces when the sealing substrate is removed, leading to increased testing time and reduced performance.
Innovation Solution
A method involving the use of a spacer and inorganic sealing material, such as frit glass, to space the sealing substrate apart from the mother substrate, allowing for the removal of the sealing substrate without damaging the test wiring, and exposing it for external signal connection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the sealing substrate is removed to expose the test wiring for external signal connection, then the display can be tested in a sheet unit, but the test wiring is damaged by electrostatic forces during substrate contact
Solution Approach 1:
A spacer is introduced as an intermediary element between the sealing substrate and the mother substrate. This spacer prevents direct contact between the substrates, thereby eliminating the electrostatic discharge that damages the test wiring while still allowing the sealing substrate to be removed for testing purposes.
Solution Approach 2:
The spacer is positioned in advance at the peripheral portion of the mother substrate before the sealing substrate is adhered. This preliminary placement ensures that when the substrates are brought together, the spacer is already in position to prevent harmful electrostatic contact.
2Reliability
If the sealing substrate is adhered closely to the mother substrate for proper sealing, then the sealing effectiveness is improved, but the test wiring cannot be accessed for external connection
Solution Approach 1:
The peripheral region is segmented into two functional zones: a sealing region where the substrates are adhered for effective sealing, and a test region where the spacer maintains separation to allow test wiring exposure. This segmentation allows both sealing effectiveness and wiring accessibility to be achieved simultaneously.
3Strength
If the substrates are pressed together with several tons to several tens of tons of pressure for adhesion, then the bonding strength is improved, but electrostatic forces damage the test wiring
Solution Approach 1:
The spacer acts as a mechanical intermediary that distributes and controls the pressure during adhesion. It allows the required bonding pressure to be applied for strong adhesion while preventing the substrates from making direct contact in the test wiring region, thus avoiding electrostatic damage.
Data Source
AI summary
A method for manufacturing an organic light emitting display. Pixel portions are formed on a mother substrate. A test wiring for testing pixel portions is formed at a peripheral portion of the mother substrate. A sealing material is formed at one surface of a sealing substrate to enclose the pixel portions, the sealing substrate being sealed to be spaced apart from the mother substrate. A spacer is formed at a side region of the one surface of the sealing substrate on which the sealing material is formed. The mother substrate and the sealing substrate are adhered to each other by the sealing material to seal the pixel portions within an enclosure formed by the mother substrate, sealing surface, and sealing material. A part of the sealing substrate is scribed and removed to expose the test wiring, the part of sealing substrate being arranged over a portion of the test wiring.