Display Junction Area Insulation Thickness Control
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Solution Overview
Problem
In organic light emitting display devices, the organic insulating material in the non-display area acts as a permeation path for oxygen or moisture, leading to damage of the inorganic insulating material in the junction area, causing defects such as disconnection or oxidation, which deteriorates the quality reliability and lifespan of the display device.
Innovation Solution
A display device with a substrate having a main region and a sub-region, including a circuit layer with specific insulating and conductive layers, where the encapsulation layer is directly on the third insulating layer in the junction area, maintaining its thickness equal to that in the display area to prevent damage, and a polarization layer extending into the non-display area to overlap the junction area, reducing defects during the lamination process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the organic insulating material is removed in the junction area to prevent permeation, then the protection against oxygen and moisture is improved, but the inorganic insulating material becomes thinner and more susceptible to damage from corrosion, cracking, and oxidation
Solution Approach 1:
The patent applies different insulating material configurations to different areas: the organic insulating material is removed specifically in the junction area where it would create permeation paths, while being retained in the display area where it provides necessary insulation. In the junction area, the inorganic insulating material thickness is maintained to prevent damage, creating a localized structural variation that addresses the specific problem of permeation without compromising overall integrity.
2Stability of the object's composition
If the polarization layer is extended to the non-display area for stable positioning, then the stability of the polarization layer is improved, but the thinned inorganic insulating material in the junction area is damaged due to lamination pressure
Solution Approach 1:
The patent performs preliminary protective action by maintaining the full thickness of the inorganic insulating material in the junction area before the lamination process occurs. This pre-established structural reinforcement prevents damage during subsequent polarization layer lamination, allowing the polarization layer to extend into the non-display area for stable positioning without compromising the underlying circuit layer integrity.
3Area of stationary object
If the thickness of the inorganic insulating material is reduced in the junction area, then the area for bonding encapsulation layer is increased, but the conductive layer is damaged by corrosion, cracking, and oxidation
Solution Approach 1:
The patent implements local quality differentiation by maintaining the full thickness of the inorganic insulating material specifically in the junction area where conductive layers are present, while allowing thickness reduction or removal in areas where only inorganic insulating material exists. This localized approach provides sufficient bonding area for the encapsulation layer while protecting conductive layers from exposure to corrosive environments.
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
This configuration effectively prevents corrosion, cracking, and oxidation of the conductive layers, thereby enhancing the quality reliability and lifespan of the display device by maintaining the integrity of the inorganic insulating material in the junction area.
Implementation Method 1
Permeation of oxygen or moisture is blocked by such an encapsulation layer, and rapid deterioration of the organic light emitting material and the like of the light emitting element layer may be prevented
Data Source
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AI summary
A display device includes: a substrate including a display area, a non-display area, and a sub-region, a circuit layer, a light emitting element layer, an encapsulation layer, and a polarization layer. The non-display area includes a dam area apart from the display area and in which at least one dam portion surrounding the display area is arranged, and a junction area surrounding the dam area. The circuit layer includes a semiconductor layer, a first insulating layer, a first conductive layer, a second insulating layer, a second conductive layer, a third insulating layer, a third conductive layer, a fourth insulating layer, and a fourth conductive layer. In the junction area, the encapsulation layer is disposed on the third insulating layer. A thickness of the third insulating layer at a central point of the junction area is substantially the same as a thickness of the third insulating layer in the display area.