Optical Sensor Encapsulation with Index Matching for Under-Display Cameras
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Solution Overview
Problem
In electronic devices with under-display cameras, the removal of some pixels and drive circuits to enhance transmissivity in the under-display camera area leads to thickness deviations and air gaps, which degrade transmissivity and make it difficult to form a smooth touch pattern.
Innovation Solution
An index matching layer is formed on the area from which components of the encapsulation portion are removed to prevent thickness deviations, and the upper surface is smoothened to allow for a smooth touch pattern.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If some pixels and drive circuits are removed from the under display camera area to enhance transmissivity, then transmissivity is improved, but thickness deviation occurs and air gaps are formed which degrade transmissivity and make it difficult to form a smooth touch pattern
Solution Approach 1:
The encapsulation structure is differentiated into two regions: a first encapsulation portion over the sensor area with reduced layers (omitting the organic layer) to maximize light transmissivity, and a second encapsulation portion over the display area with complete layers for full protection. This local differentiation allows each region to have the quality appropriate for its function.
Solution Approach 2:
The patent resolves the thickness deviation problem by extending the inorganic encapsulation layers vertically to compensate for the missing organic layer thickness. The first inorganic layer is formed to a thickness that compensates for the omitted organic layer, maintaining overall encapsulation thickness and preventing air gaps while preserving optical transmissivity.
2Illumination intensity
If some components of the encapsulation portion are removed to enhance transmissivity, then transmissivity is improved, but a step is formed making it difficult to form a touch pattern
Solution Approach 1:
The encapsulation structure is differentiated into two regions: a first encapsulation portion over the sensor area with reduced layers (omitting the organic layer) to maximize light transmissivity, and a second encapsulation portion over the display area with complete layers for full protection. This local differentiation allows each region to have the quality appropriate for its function.
Solution Approach 2:
The patent resolves the thickness deviation problem by extending the inorganic encapsulation layers vertically to compensate for the missing organic layer thickness. The first inorganic layer is formed to a thickness that compensates for the omitted organic layer, maintaining overall encapsulation thickness and preventing air gaps while preserving optical transmissivity.
Data Source
AI summary
An electronic device is provided. The electronic device includes a display panel and at least one optical sensor. The display panel is disposed in an internal space of a housing so as to be visible from the outside and includes a display region and a sensor region. The at least one optical sensor may correspond, below the display panel, to the sensor region. The display panel includes a plurality of pixels disposed on a substrate, a plurality of driving circuit units for driving the plurality of pixels, a first encapsulation unit for encapsulating the sensor region, and a second encapsulation unit for encapsulating the display region. The first encapsulation unit and the second encapsulation unit may be different in terms of the stacked structure of layers.