OLED Display Layout for Common Layer Removal Without Seal Loss
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Solution Overview
Problem
In organic EL display devices, it is challenging to remove a common functional layer from non-display regions without compromising the sealing performance of the sealing film, as existing methods like using a metal layer that converts light to heat can lower the sealing performance.
Innovation Solution
A display device design that includes a resin substrate with a thin film transistor layer, a light-emitting element layer, and a sealing film, where an oxide semiconductor layer is provided in an island shape in the non-display region, and a first opening in the inorganic insulating film exposes it, allowing the common functional layer to be removed by laser irradiation without affecting the sealing film.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a metal layer capable of converting light to heat is provided in the non-display region to remove the common functional layer by laser irradiation, then the common functional layer can be removed, but the sealing performance of the organic EL element due to the sealing film is lowered
Solution Approach 1:
The patent extracts and removes the common functional layer from the non-display region through laser irradiation, allowing electronic components to be installed while maintaining display functionality. The oxide semiconductor layer is selectively removed to enable access to the non-display region without affecting the sealing structure.
Solution Approach 2:
The patent applies local quality by providing the oxide semiconductor layer only in the non-display region, allowing selective removal of the common functional layer where needed while preserving the sealing film's integrity in the display region. This localized approach enables functional differentiation between display and non-display areas.
2Adaptability or versatility
If a through hole penetrating in the thickness direction is provided in the non-display region to install electronic components, then electronic components can be installed, but the structural integrity and sealing performance may be compromised
Solution Approach 1:
The patent implements a nested structure where the non-display region is positioned within the display region, and the common functional layer is removed only in this nested non-display area. This allows electronic components to be installed in the non-display region while the display region maintains its complete sealing structure.
Solution Approach 2:
The patent segments the display panel into display and non-display regions, with the common functional layer being present only in the display region and removed in the non-display region. This segmentation allows independent optimization of each region's functionality while maintaining overall device integrity.
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
Enables the removal of the common functional layer in non-display regions while maintaining the sealing performance of the organic EL element, ensuring the integrity of the display device.
Implementation Method 1
it is conceived that a metal layer capable of converting light to heat is provided in the non-display region and the metal layer is irradiated with laser light to sublimate the common functional layer
Data Source
AI summary
According to an aspect of the disclosure, in a non-display region inside a display region, an oxide semiconductor layer is provided in an island shape, a first opening is provided in a first inorganic insulating film so as to expose the oxide semiconductor layer in the non-display region, a common functional layer is provided so as to extend from the display region to the non-display region, and a second opening is provided so as to expose the oxide semiconductor layer in the common functional layer, a peripheral end of the second opening being surrounded by a peripheral end of the first opening in a plan view.