Optical Coating Layer for Under-Display Camera Light Scattering
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Solution Overview
Problem
Electronic devices with camera modules under display modules face challenges in achieving high-quality captured images due to light scattering, which affects both sensing performance and display quality.
Innovation Solution
The implementation of a coating layer with an average thickness of 10 nm to 10000 nm and a refractive index of 1.0 to 1.6 on the outermost surfaces of the window and display modules, made from acryl-based, siloxane-based, or composite resins, to minimize light scattering and haze.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a camera module is arranged under a display module to increase display region, then display area is increased, but light scattering occurs which deteriorates sensing performance and image quality
Solution Approach 1:
The patent introduces a coating layer as an intermediary substance between the window module and display module. This coating layer has specific optical properties (refractive index between 1.0 to 1.6, thickness of 10 nm to 10000 nm) that mediate the interaction of light with the stacked structures, reducing light scattering and haze while allowing the camera module to function effectively under the display.
Solution Approach 2:
The patent applies parameter changes by controlling the refractive index and thickness of the coating layer. By adjusting these parameters within specific ranges, the optical properties of the stacked structures (window module, display module, camera module) are optimized to minimize light scattering and maintain low haze levels (4.5% or less), thereby improving both display area utilization and image quality.
2Device complexity
If multiple modules (window module, display module, camera module) are stacked, then device integration is improved, but haze increases which deteriorates display quality and sensing performance
Solution Approach 1:
The coating layer serves as an intermediary that reduces the cumulative haze effect of stacked modules. By positioning this layer with appropriate optical properties between the window module and display module, it compensates for the increased haze that would otherwise result from multiple stacked components, maintaining overall haze at 4.5% or less.
Solution Approach 2:
The patent employs composite material principles by creating a multi-layer structure consisting of the window module, coating layer, and display module. The coating layer acts as a composite component with specific refractive index properties that optimize the overall optical performance of the stacked assembly, reducing haze while maintaining integration.
3Measurement precision
If the coating layer refractive index is between 1.0 to 1.6, then light scattering is reduced improving sensing performance, but manufacturing precision requirements increase
Solution Approach 1:
The patent defines a broad parameter range for the coating layer thickness (10 nm to 10000 nm) and refractive index (1.0 to 1.6), which provides manufacturing flexibility. By specifying ranges rather than exact values, the patent achieves optimal sensing performance while accommodating variations in manufacturing processes and reducing the stringency of precision requirements.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution improves the sensing performance and display quality by reducing light scattering, resulting in enhanced imaging quality and maintaining low haze levels of about 4.5% or less, thereby improving the overall performance of the electronic device.
Implementation Method 1
the coating layer may have a refractive index between a refractive index of an outermost layer of the window module including the first outermost surface and a refractive index of air, or between a refractive index of an outermost layer of the display module including the first outermost surface of the display module and the refractive index of air
Data Source
AI summary
An electronic device includes an electronic module, a display module including a first region overlapping the electronic module, and a second region not overlapping the electronic module, a window module disposed on the display module, and a coating layer disposed on at least one of a first outermost surface of the window module opposite to a second outermost surface of the window module facing the display module and a first outermost surface of the display module opposite to a second outermost surface of the display module facing the window module.