Capping Layer Layout for Under-Display Optical Transmittance
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Solution Overview
Problem
Display devices with integrated optical electronic devices face challenges in maintaining a reduced bezel size and efficient light reception due to the need for these devices to be exposed in the front portion, leading to design limitations.
Innovation Solution
A display device design that includes a first optical area with a capping layer over light emitting elements, allowing for different thicknesses and refractive indexes in the optical and normal areas to enhance light transmission without reducing the display area's size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an optical electronic device is located in the front portion of the display device to receive incident light, then the optical electronic device can be effectively exposed to light, but the bezel size increases or the display area is reduced
Solution Approach 1:
The optical electronic device is relocated from the front surface (2D plane) to the rear side of the display panel, utilizing the third dimension (depth) to resolve the conflict between light reception and display area. Light passes through the display panel from the front to reach the optical device positioned on the rear side.
Solution Approach 2:
A light transmission structure is introduced as an intermediary between the incident light and the optical electronic device. This structure includes a first optical area with a capping layer that has different thickness and refractive index characteristics to facilitate light transmission through the display panel to the optical device.
2Illumination intensity
If the electrode thickness is reduced to improve light transmission, then light transmittance increases, but the light emitting element performance decreases and lifetime is reduced
Solution Approach 1:
The capping layer is designed with different thickness and refractive index characteristics in different regions: the first optical area has optimized properties for light transmission, while other areas maintain standard characteristics. This localized differentiation allows enhanced light transmission in the optical area without compromising the overall structure and performance of the light emitting element.
Solution Approach 2:
The thickness and refractive index parameters of the capping layer are specifically adjusted in the first optical area to optimize light transmission. By changing these physical parameters locally, the patent achieves improved light transmittance without requiring reduction of the electrode thickness, thereby preserving light emitting element performance and lifetime.
3Illumination intensity
If a capping layer with different thickness and refractive indexes is designed in the first optical area, then light transmittance is enhanced, but the device complexity increases
Solution Approach 1:
The capping layer is segmented into different regions with distinct characteristics: a first optical area with optimized thickness and refractive index for light transmission, and a normal area with standard properties. This segmentation allows the complex light transmission requirements to be met while maintaining a manageable and manufacturable structure.
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
Enables excellent light transmittance and maintains display efficiency while preventing electrode thickness reduction, thus avoiding decreased light emitting element performance and extending its lifetime.
Implementation Method 1
allowing one or more of the thicknesses and refractive indexes of respective portions of a first capping layer located in a first optical area and a normal area NA to be different from each other
Data Source
AI summary
The present disclosure relates to a display device including a first capping layer and enabling a first optical area to have a higher transmittance by designing the first optical area such that at least one of thicknesses and refractive indexes of respective portions of the first capping layer in the first optical area and the normal area is different from each other.