OLED Display Peripheral Filters for Light Shielding Without Peeling
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Solution Overview
Problem
Existing display devices using organic electroluminescent elements face issues with peeling of color filters in the peripheral region, which affects yield and light shielding properties.
Innovation Solution
A display device design that includes a first substrate with organic EL elements and peripheral wiring, a transparent substrate, a light shielding filter portion, and a transparent adhesive layer bonding the substrates, reducing color filter thickness to prevent peeling and maintaining light shielding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If color filters are stacked at the periphery to shield peripheral wiring from light, then light shielding property is improved, but peeling of color filters occurs during manufacturing
Solution Approach 1:
The periphery shielding function is segmented into two separate color filters: a first color filter on the element substrate and a second color filter on the transparent substrate. This segmentation reduces the thickness of each individual filter, preventing peeling while maintaining effective light shielding through the combined action of both filters.
Solution Approach 2:
A transparent adhesive layer is introduced as an intermediary between the element substrate and the transparent substrate. This adhesive layer bonds the substrates together while allowing light to pass through, maintaining the light shielding function while providing structural stability to prevent peeling.
2Object-affected harmful factors
If color filters are stacked at the periphery to shield peripheral wiring from light, then light shielding property is improved, but manufacturing yield decreases due to peeling
Solution Approach 1:
The periphery shielding function is segmented into two separate color filters: a first color filter on the element substrate and a second color filter on the transparent substrate. This segmentation reduces the thickness of each individual filter, preventing peeling while maintaining effective light shielding through the combined action of both filters.
Solution Approach 2:
A transparent adhesive layer is introduced as an intermediary between the element substrate and the transparent substrate. This adhesive layer bonds the substrates together while allowing light to pass through, maintaining the light shielding function while providing structural stability to prevent peeling.
3Object-affected harmful factors
If a single thick color filter is used for light shielding, then light shielding property is improved, but peeling occurs more easily
Solution Approach 1:
The periphery shielding function is segmented into two separate color filters: a first color filter on the element substrate and a second color filter on the transparent substrate. This segmentation reduces the thickness of each individual filter, preventing peeling while maintaining effective light shielding through the combined action of both filters.
Solution Approach 2:
The light shielding system is constructed as a composite structure combining two color filters with different thicknesses and properties. The first color filter (thinner) and second color filter (thinner) work together as a composite light shielding system that provides effective light blocking while maintaining flexibility and adhesion to prevent peeling.
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
Improves yield and maintains light shielding properties by securely bonding substrates with a transparent adhesive layer, reducing color filter thickness and preventing peeling.
Implementation Method 1
a transparent adhesive layer that is provided between the first color filter and the second color filter and bonds the element substrate and the transparent substrate to each other
Implementation Method 2
The light shielding filter portion includes a first color filter disposed in the peripheral region of the first surface and a second color filter disposed on the second surface to face the first color filter, and shields the peripheral wiring from light
Data Source
AI summary
Provided is a display device that includes a first substrate that includes a first face and a peripheral region, a plurality of organic electroluminescent elements on the first substrate, and a plurality of color filters on the plurality of organic electroluminescent elements. The plurality of color filters includes at least a first color filter and a second color filter, and a part of the first color filter and a part of the second color filter are stacked in the peripheral region of the first substrate. The display device also includes a protection member on the plurality of color filters, a second substrate having a second face, where the second face faces the plurality of color filters, and a seal member between the first face and the second face in the peripheral region.