Under-Panel Sensor Display Light Guide for Full-Screen Uniformity
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Solution Overview
Problem
Existing display devices face challenges in implementing a full-screen display due to the presence of cameras and sensors, which limit the screen size and create visible imaging areas and dark areas, affecting light uniformity and transmittance.
Innovation Solution
A display device design incorporating a backlight unit with a light guide plate, reflectors, and sensors disposed under the display panel, where light from sensors is reflected and transmitted through specific structures to minimize visible imaging areas and enhance light uniformity and transmittance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If cameras and sensors are disposed in the imaging area to enable full-screen display, then the screen size is increased, but the imaging area becomes visible from the outside and creates dark areas affecting light uniformity
Solution Approach 1:
A light-transmitting member is introduced as an intermediary component between the imaging area and the display panel. This member allows light from the imaging area to pass through while blocking the visible imaging area from being seen from the outside, thus resolving the contradiction between full-screen display and hidden imaging area.
Solution Approach 2:
The imaging area is extracted from the visible display region by positioning it beneath the display panel and using the light-transmitting member to separate the functional imaging zone from the visual display zone, enabling full-screen appearance while maintaining camera functionality.
2Object-affected harmful factors
If the imaging area is made invisible by placing sensors under the display panel, then the screen design is improved, but light transmittance decreases due to additional structural layers
Solution Approach 1:
The light-transmitting member is designed with specific optical parameters (transmittance > 90% for visible light, selectivity for infrared light) to minimize light loss while achieving the hidden imaging area effect. By optimizing these parameters, the contradiction between invisibility and transmittance is resolved.
Solution Approach 2:
The light-transmitting member exhibits different optical properties for different wavelengths: high transmittance for visible light to maintain display quality, and selective reflection or absorption for infrared light to enable sensor functionality. This local differentiation of optical quality resolves the transmittance contradiction.
3Illumination intensity
If reflectors are added to improve light uniformity and reduce dark areas, then light distribution is improved, but device complexity increases
Solution Approach 1:
The light-transmitting member is merged with the display panel structure, and reflectors are integrated into the existing imaging area configuration. By combining multiple functions into unified components, the device complexity increase is minimized while achieving improved light uniformity.
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 full-screen display by reducing visible dark areas and improving light uniformity and transmittance, allowing for enhanced imaging capabilities and miniaturization of the device.
Implementation Method 1
a light guide plate including a first light guide portion disposed under the first display area and a second light guide portion disposed under the second display area
Implementation Method 2
a first reflector disposed on the second light guide portion, and the first reflector can transmit light emitted from the first sensor and reflect light emitted from the second sensor
Implementation Method 3
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 first sensor and a second sensor disposed under the display panel. The backlight unit includes a light guide plate having a first light guide portion disposed under the first display area and a second light guide portion disposed under the second display area, a light source configured to radiate light to the light guide plate, and a first reflector disposed on the second light guide portion. The first reflector transmits light emitted from the first sensor and reflects light emitted from the second sensor.