Under-Display Light Receiving Structure for Narrow-Bezel Panels
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Solution Overview
Problem
Display devices with integrated light receiving devices, such as cameras and proximity sensors, face issues of enlarged bezels or design restrictions due to the need for these components to be exposed on the front, which compromises the aesthetic and functional integrity of the device.
Innovation Solution
Positioning the light receiving devices behind the display panel and optimizing the display panel structure to enhance light transmission, including varying subpixel density and incorporating transmittance improving structures to ensure effective light reception without exposing the devices to the front.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If light receiving devices are installed on the front side of the display device, then light receiving function is achieved, but bezel is enlarged or front design is restricted
Solution Approach 1:
The patent relocates the light receiving device from the front surface (2D plane) to the rear side of the display panel, utilizing the third dimension (depth/thickness) of the device structure. This dimensional transition allows the camera to be positioned behind the display panel while still accessing light from the front, thereby eliminating the need for front-facing notches or enlarged bezels.
Solution Approach 2:
The patent introduces a light-transmitting structure (such as a transparent window or optical conduit) as an intermediary element that bridges the gap between the front surface and the rear-mounted light receiving device. This intermediary allows light to pass through the display panel structure to reach the camera sensor positioned on the rear side.
2Shape
If light receiving devices are positioned behind the display panel, then bezel size is reduced and design freedom is improved, but light transmission efficiency decreases
Solution Approach 1:
The patent applies different optical properties to different regions of the display panel. Specifically, the region corresponding to the light receiving device location is designed with enhanced light transmission characteristics (such as transparent materials or optical conduits), while other regions maintain normal display functionality. This localized optimization ensures efficient light delivery to the camera without compromising overall display performance.
Solution Approach 2:
The patent modifies optical parameters (such as transparency, refractive index, or optical path length) of specific structures within the display panel to optimize light transmission. By adjusting these parameters in the regions where light needs to pass through, the system maintains high light transmission efficiency despite the rear-mounted camera configuration.
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 allows for a reduced bezel size, improved design freedom, and effective light reception by the light receiving devices while maintaining normal image display functionality.
Implementation Method 1
light from the front of a display panel can be well transmitted to a light receiving device through a display panel
Data Source
AI summary
A display device can include a display panel including first and second display areas, a plurality of substrates having different thickness, at least one metal layer on the plurality of substrates, a transistor over the metal layer, a passivation layer disposed on the transistor, a first planarization layer on the passivation layer, a second source-drain electrode pattern on the first planarization layer, a second planarization layer on the second source-drain electrode pattern, an anode electrode on the second planarization layer, a bank and a light emitting layer on the anode electrode, an encapsulation layer, and a touch sensor over the encapsulation layer. Also, a light receiving device is under the display panel and overlapped with the first display area, in which at least one of the passivation layer, the first planarization layer, and the second planarization layer in the second display area extends to the first display area.