Under-Display Camera Backlight Reflector for Hidden Imaging Areas
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The challenge of implementing a full-screen display in mobile terminals is hindered by the presence of front cameras, which limit screen size and require designs like notches or punch holes, and existing solutions for integrating cameras in displays often result in visible imaging areas and dark areas due to sensor interference.
Innovation Solution
A display device design featuring a backlight unit with a light guide plate, reflector, and sensor configuration that allows light from a sensor to pass through and be reflected externally while maintaining camera performance, using a reflector to minimize visible dark areas and enhance imaging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a front camera is integrated into the display screen, then the screen size can be increased, but the imaging area becomes visible and creates dark area phenomena
Solution Approach 1:
A reflector is introduced as an intermediary component between the sensor and the external environment. The reflector redirects visible light away from the imaging area while allowing infrared light from the sensor to pass through, thereby eliminating the visible imaging area and dark area phenomena while maintaining full-screen display functionality
Solution Approach 2:
The display panel is divided into different regions with different optical properties. The imaging area has specialized characteristics that allow it to be invisible in the visible spectrum while remaining functional for infrared sensing, creating local quality differences that resolve the contradiction between full-screen display and sensor functionality
2Object-affected harmful factors
If a reflector is added to hide the imaging area, then the dark area phenomenon is improved, but the device complexity increases
Solution Approach 1:
The reflector serves multiple functions simultaneously: it hides the imaging area from visible light, redirects light to improve display uniformity, and allows infrared light transmission for sensor operation. This multi-functionality reduces the need for additional separate components, thereby limiting the increase in device complexity
3Area of stationary object
If the sensor is disposed under the display panel, then the full-screen display is achieved, but light from the sensor is blocked causing dark areas
Solution Approach 1:
The optical path is redirected into a different spatial dimension by the reflector. Instead of light traveling directly upward from the sensor, the reflector causes it to travel at an angle, changing the dimensional path of light propagation and allowing it to reach the display area without being blocked by the display panel 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
The solution enables a full-screen display by hiding the imaging area and improving dark area phenomena, allowing for a more compact and efficient display design with maintained camera functionality.
Implementation Method 1
a reflector disposed between the second display area and the sensor and reflecting incident visible light to the second display area
Implementation Method 2
a light guide plate disposed under the first display area and the second display area, a light source configured to radiate light to the light guide plate
Data Source
AI summary
A display device can include a backlight unit, a display panel disposed on the backlight unit and including a first display area and a second display area, and a sensor disposed under the second display area. The backlight unit includes a light guide plate disposed under the first display area and the second display area, a light source configured to radiate light to the light guide plate, and a reflector disposed between the second display area and the sensor and reflecting incident visible light to the second display area.