Display Protective Layer for Clear Under-Display Camera Imaging
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Solution Overview
Problem
Existing electronic devices face challenges in achieving a wider display area with a narrower non-display area while maintaining high image clarity and optical signal transmission.
Innovation Solution
A display device design featuring a first display area with high pixel density and a second display area with lower pixel density, incorporating a protective layer with specific optical properties and a synthetic resin film or layer to enhance optical signal transmission and image clarity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a second display area with lower pixel density is implemented to enable optical signal transmission for camera functionality, then the display area can be widened and non-display area narrowed, but image clarity and optical signal transmission quality deteriorate
Solution Approach 1:
The display panel is divided into two distinct display areas with different pixel densities: a first display area with high pixel density for normal display content, and a second display area with lower pixel density optimized for optical signal transmission to the camera module. This local differentiation allows each region to perform its specialized function optimally without compromising the other.
Solution Approach 2:
A protective layer with specifically controlled optical properties (haze of 4% or less, wavefront peak valley value of 0.05-2.00, wavefront root mean square value of 0.01-0.40) is introduced as an intermediary component between the display panel and the camera module. This protective layer acts as an optical mediator that transmits optical signals from the second display area to the camera module while maintaining image quality and protecting the underlying components.
2Measurement precision
If a protective layer with specific optical properties is introduced to improve optical signal transmission, then image clarity improves, but device structure and manufacturing complexity increase
Solution Approach 1:
The protective layer serves multiple functions simultaneously: it protects the display panel and camera module from physical damage, maintains moisture barrier functionality, and critically, transmits optical signals with controlled haze and wavefront properties to enable clear imaging by the camera module. This multi-functionality reduces the need for separate dedicated components.
Solution Approach 2:
The protective layer's optical parameters are precisely controlled within specific ranges (haze ≤4%, wavefront peak valley 0.05-2.00, wavefront RMS 0.01-0.40) to optimize optical signal transmission. By adjusting and controlling these physical parameters during material selection and manufacturing, the protective layer achieves optimal optical performance without requiring additional complex optical components.
3Loss of energy
If the protective layer haze is reduced to improve optical signal transmission, then optical signal transmission efficiency improves, but manufacturing precision requirements increase
Solution Approach 1:
The haze parameter of the protective layer is controlled within a specific range (4% or less) to optimize optical signal transmission efficiency. By defining and controlling this physical parameter during material selection and manufacturing processes, the patent achieves optimal balance between optical performance and manufacturing feasibility.
Solution Approach 2:
The protective layer exhibits differentiated optical properties in different regions: it maintains low haze (≤4%) specifically in the area corresponding to the second display area to optimize optical transmission to the camera module, while other regions can have different properties optimized for their specific functions. This local optimization allows precise control where needed without compromising overall device performance.
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
The design achieves a modulation transfer function value of about 60% or more, ensuring clear image reproduction and efficient optical signal transmission through the second display area.
Implementation Method 1
a protective layer under the display panel... a lower layer in which a first opening corresponding to the second display area is defined... a modulation transfer function value of an image of a subject outside the window, which is photographed by a camera module that is under the lower layer to correspond to the first opening may be about 60% or more
Implementation Method 2
a portion of the protective layer, which corresponds to the second display area, may have a haze of about 4% or less
Implementation Method 3
a wavefront peak valley value of about 0.05 or more and about 2.00 or less, a wavefront root mean square value of about 0.01 or more and about 0.40 or less
Data Source
AI summary
A display device includes: a window; a display panel comprising a first display area and a second display area having a pixel density less than that of the first display area, the display panel being under the window; a protective layer under the display panel; and a lower layer in which a first opening corresponding to the second display area is defined and which is under the protective layer, wherein a portion of the protective layer, which corresponds to the second display area, has a haze of 4% or less, a wavefront peak valley value of 0.05 or more and 2.00 or less, a wavefront root mean square value of 0.01 or more and 0.40 or less.