Display Device Thinned-Out Subpixel Oxidation Protection
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Solution Overview
Problem
In organic EL display devices with an image capturing unit inside the display region, thinned-out subpixels are prone to lighting failures due to reduced transmittance, which can also affect adjacent subpixels.
Innovation Solution
The display device incorporates a layered structure with a base substrate, thin film transistor layer, light-emitting element layer, and sealing film, where subpixels are divided into normal and thinned-out groups, and the inorganic insulating film has openings in the image capturing region to manage moisture and prevent oxidation of electrodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If subpixels are thinned out in the image capturing unit to increase transmittance, then light transmittance is improved, but lighting failure occurs more easily in thinned-out subpixels and adjacent subpixels
Solution Approach 1:
The patent applies different structural qualities to different regions: normal subpixels maintain their standard structure while thinned-out subpixels in the image capturing region have reduced thickness. Additionally, the inorganic insulating film has openings specifically in the image capturing region, creating local structural differences that protect thinned-out subpixels from oxidation while maintaining high transmittance where needed.
Solution Approach 2:
The inorganic insulating film with openings is provided beforehand to prevent moisture and oxygen from reaching the electrodes in thinned-out subpixels. This protective structure is built during manufacturing to preemptively guard against oxidation and lighting failures before they can occur during device operation.
2Illumination intensity
If subpixels are thinned out to increase transmittance, then image capturing performance is improved, but oxidation of electrodes increases leading to lighting failure
Solution Approach 1:
The inorganic insulating film creates a protective barrier that excludes moisture and oxygen from the thinned-out subpixel regions, effectively providing an inert environment for the electrodes. The openings in the inorganic insulating film allow controlled access while maintaining overall protection against oxidation.
Solution Approach 2:
The inorganic insulating film is configured with openings specifically in the image capturing region where thinned-out subpixels are located, creating localized protection against oxidation only where the transmittance enhancement is needed, while other regions maintain their standard protective coverage.
Data Source
AI summary
A display device includes a display panel including a base substrate layer, a thin film transistor layer, a light-emitting element layer, and a sealing film, and includes an image capturing unit provided on the base substrate layer side of a display region of the display panel. A plurality of subpixels constituting the display region are divided into a group of normal subpixels provided so as not to overlap with the image capturing unit and a group of thinned-out subpixels provided so as to overlap with the image capturing unit. The inorganic insulating film is provided with openings passing through the inorganic insulating film, in an image capturing region overlapping with the group of thinned-out subpixels.