Zero-Bezel Light Emitting Display Apparatus with Overlapping Switching Circuits
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Solution Overview
Problem
Existing light emitting display apparatuses and multi-screen display apparatuses suffer from a bezel width issue, leading to a sense of disconnection in images and reduced viewer immersion due to the boundary portions formed between adjacent display units.
Innovation Solution
A light emitting display apparatus with a zero-bezel width design, featuring a dam portion with a metal line along the periphery, an encapsulation layer with an organic layer surrounded by the dam, and switching circuit portions overlapping the dam, which minimizes bezel width and enhances image continuity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a bezel area is disposed at an edge of a display panel, then the light emitting display apparatus can be manufactured with standard structure, but the bezel width increases and boundary portions are formed between adjacent display units
Solution Approach 1:
The patent extracts the switching circuit portion from the traditional bezel area and relocates it to overlap with the dam portion. This removes the need for a separate bezel structure while maintaining all necessary functional components, thereby reducing bezel width to zero and eliminating boundary portions between adjacent display units in multi-screen configurations.
Solution Approach 2:
The patent transitions the switching circuit portion from a planar arrangement within the bezel area to a vertical arrangement that overlaps with the dam portion in the thickness direction. This dimensional change allows the circuit to occupy space that would otherwise be structural support, enabling zero-bezel design without compromising structural integrity.
2Ease of manufacture
If the switching circuit portion is disposed in the bezel area, then the circuit can be arranged, but the bezel width increases and image continuity is broken
Solution Approach 1:
The patent merges the switching circuit portion with the dam portion by positioning the circuit to overlap with the dam structure. This combination eliminates the visual separation between functional components and structural elements, creating a seamless appearance that maintains image continuity across the entire display surface including edges.
3Reliability
If the organic encapsulation layer extends to the edge of the substrate, then the light emitting device is protected, but water penetration risk increases at the edges
Solution Approach 1:
The patent introduces the dam portion as an intermediary barrier between the organic encapsulation layer and the external environment. The dam structure provides an additional protective layer that prevents water and moisture from directly contacting the encapsulation layer edges, thereby maintaining device protection while eliminating the water penetration risk associated with extended encapsulation to substrate edges.
Data Source
AI summary
A light emitting display apparatus includes a display portion including a plurality of pixel driving lines disposed over a substrate and a plurality of pixels selectively connected to the plurality of pixel driving lines, a light emitting device layer disposed at the display portion, a dam portion including at least one dam having a metal line, a plurality of switching circuit portions disposed to overlap the at least one dam and selectively connected to the plurality of pixel driving lines, and a front pad portion including a plurality of front pads electrically coupled to the plurality of pixel driving lines and the metal line of the at least one dam, each of the plurality of switching circuit portions includes first and second switching circuits each including a gate electrode electrically coupled to the metal line of the at least one dam.