Under-Display Camera Area Encapsulation for Moisture Barrier
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Solution Overview
Problem
Display devices face issues with increased non-pixel areas due to camera placement, leading to reduced pixel areas and potential moisture permeation, which degrades image capturing quality.
Innovation Solution
Incorporating a camera see-through area within the pixel area, with a routing area for data and scan lines, and using a layered encapsulation structure to minimize moisture permeation and optimize transmittance, including a first and second inorganic encapsulation layer, and a foreign material cover layer to seal the camera see-through area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a through hole is formed in the display device to improve transmittance of the camera see-through area, then transmittance is improved, but moisture may permeate into the pixel causing defects
Solution Approach 1:
The camera see-through area is divided into multiple functional layers: the first inorganic encapsulation layer provides moisture barrier, the foreign material cover layer fills defects and provides additional protection, and the second inorganic encapsulation layer seals the top surface. This segmented multi-layer structure allows each layer to perform its specific function while collectively solving both transmittance and moisture protection requirements.
Solution Approach 2:
The patent uses a composite encapsulation structure combining three different materials: inorganic encapsulation layers (providing moisture barrier and structural stability) and foreign material cover layer (filling defects and providing additional protection). This composite structure leverages the advantages of each material to simultaneously achieve high transmittance and effective moisture protection.
2Area of stationary object
If the camera see-through area overlaps the pixel, then the non-pixel area is reduced, but the image capturing quality may be degraded
Solution Approach 1:
The pixel structure is locally modified in the camera see-through area: sub-pixels are selectively disposed to provide necessary structural support and moisture protection, while the organic light emitting diode and cathode are excluded from this specific area to maintain high transmittance. This local differentiation allows the pixel area to be maximized without compromising image capturing quality.
3Adaptability or versatility
If the camera, speaker, and sensor are disposed in the non-pixel area, then the display device functions are complete, but the non-pixel area is increased and pixel area is reduced
Solution Approach 1:
The camera see-through area is designed to serve multiple functions: it acts as part of the pixel area (maintaining structural integrity and moisture protection), provides a through-hole for camera placement (enabling imaging function), and maintains high transmittance (ensuring optical performance). This multi-functional design eliminates the need for separate non-pixel areas for camera placement.
Data Source
AI summary
A display device includes a camera see-through area which includes a camera module disposed therein; a routing area which is disposed in the vicinity of the camera see-through area and is bypassed by at least one data line and scan line; and a pixel area which includes the camera see-through area and the routing area and includes a plurality of sub-pixels including an organic light emitting diode and a cathode disposed therein.