Light-emitting display device
The overcoat layer extension in the light-emitting display device addresses mask-induced defects, improving reliability and preventing hydrogen and moisture ingress, thus ensuring long lifespan and low-power operation.
JP2026116812APending Publication Date: 2026-07-13LG DISPLAY CO LTD
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Patent Information
- Application Number
- JP2025265973
- Authority / Receiving Office
- JP · JP
- Patent Type
- Applications
- Current Assignee / Owner
- Priority Date
- 2024-12-31
- Filing Date
- 2025-12-19
- Publication Date
- 2026-07-13
AI Technical Summary
Technical Problem
In light-emitting display devices, the formation of defects such as cracks and indentations in the mask contact region during the deposition of the inorganic film leads to weakened step coverage, allowing hydrogen and moisture penetration, which can cause element degradation and reliability issues.
Method used
The light-emitting display device incorporates an overcoat layer with an extension portion into the routing area, ensuring uniform thickness to maintain a consistent load and prevent defects, thereby blocking moisture and hydrogen penetration.
Benefits of technology
This design enhances the reliability and longevity of the device by preventing defects and ensuring low-power operation.
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Smart Images
Figure 2026116812000001_ABST
Abstract
To provide a light-emitting display device with improved reliability. [Solution] The light-emitting display device 10 according to the embodiment of this specification includes a substrate including a display area DA and a pad area PA; a pixel circuit layer having a pixel circuit configured in the display area DA; an overcoat layer configured in the display area DA so as to cover the pixel circuit layer; a light-emitting element layer configured on the overcoat layer and connected to the pixel circuit; a sealing portion configured on the overcoat layer so as to cover the light-emitting element layer; and a pad portion 130 configured in the pad area PA and electrically connected to the pixel circuit, wherein the overcoat layer includes an extension portion extending into a routing area RA between the display area DA and the pad area PA, and at least a portion of the extension portion of the overcoat layer may have the same thickness as the center of the overcoat layer.
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