OLED Tiled Display Nested Substrate Encapsulation Gap Reduction
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Solution Overview
Problem
Creating large or ultra-large OLED displays by tiling smaller units results in noticeable gaps due to the wider bezels required for encapsulation, affecting image perception and operational life.
Innovation Solution
The OLED tiled display design incorporates a front and back lighting unit with extended sections that are vertically aligned and partially attached, using barrier layers and fillers to minimize gaps, where one substrate acts as an encapsulation layer for the other, eliminating the need for additional bezels and ensuring air- and water-tightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If OLED displays are tiled to create large or ultra-large displays, then the display size is increased, but gaps between the smaller displays become obvious due to wider bezels required for encapsulation
Solution Approach 1:
The patent applies nesting by placing one OLED display unit inside the encapsulation structure of another unit. Specifically, the first OLED display unit is positioned within the encapsulation region of the second unit, and vice versa, creating a nested configuration that eliminates the need for additional bezels and reduces gaps to minimal or zero width.
Solution Approach 2:
The patent transitions from a planar side-by-side arrangement to a three-dimensional nested arrangement. By utilizing the depth dimension and positioning display units at different spatial levels within the encapsulation structure, the patent eliminates the need for lateral bezels and achieves minimal gaps between tiled displays.
2Reliability
If wider bezels are added to OLED displays for encapsulation, then operational life is guaranteed, but gaps between tiled displays become more obvious
Solution Approach 1:
The patent makes the encapsulation structure serve multiple functions: it provides both the necessary moisture barrier for operational reliability and the structural framework for tiling multiple displays. The same encapsulation region houses both the active OLED area and the nested adjacent display unit, eliminating the need for additional bezel structures.
Solution Approach 2:
The patent merges the encapsulation function with the tiling structure by integrating adjacent display units within the same encapsulation region. This combination allows the encapsulation material to serve as both the protective barrier and the structural element that enables gapless tiling, rather than requiring separate bezel components.
3Shape
If additional encapsulation layers are added to reduce gaps, then gap visibility is reduced, but device complexity increases
Solution Approach 1:
The patent applies self-service by having each OLED display unit's encapsulation structure automatically serve as the housing and protective barrier for the nested adjacent unit. The encapsulation material of one unit provides the structural framework that contains and protects the other unit, eliminating the need for additional separate encapsulation layers or complex multi-layer structures.
Data Source
AI summary
The OLED tiled display includes front and back lighting display units that emitting lights toward each other. The front lighting display unit includes a first substrate and a first organic light emitting device. The back lighting display unit includes a second substrate and a second organic light emitting device. The first and second light emitting devices neighbor laterally on each other, but are vertically aligned to a second extended section of the second substrate and a first extended section of the first substrate, respectively. The present invention achieves small gaps and resolves the problem of obvious gaps in an OLED tiled display by piecing together the front and back lighting display units, where the substrate of the front lighting display unit functions as encapsulation layer to the back lighting display unit, and the substrate of the back lighting display unit functions as encapsulation layer to the front lighting display unit.