Under-Display Photosensor Layout for Higher Screen-to-Body Ratio
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Solution Overview
Problem
Existing electronic devices face a reduction in screen-to-body ratio due to the need for openings to accommodate identity recognition sensing modules, which compromises the display area.
Innovation Solution
An electronic device design featuring a light-impermeable layer with specific openings allows a photosensor to be integrated within the display region, eliminating the need for peripheral openings and enhancing the screen-to-body ratio by enabling identity recognition without reducing the display area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If an opening is formed in the peripheral region to accommodate a sensing module for identity recognition, then identity recognition function is achieved, but screen-to-body ratio is reduced
Solution Approach 1:
The patent integrates the photosensor within the display region by utilizing the vertical dimension and light propagation paths rather than horizontal placement. The light-emitting unit emits light through the display panel, and the photosensor detects reflected light from the fingerprint, enabling identity recognition functionality within the display area without requiring peripheral openings.
Solution Approach 2:
The display region serves multiple functions: it displays visual information and simultaneously performs identity recognition. The light-emitting unit and photosensor are integrated within the same display structure, allowing the display panel to function both as a visual output device and as a biometric sensing system, eliminating the need for separate peripheral sensing modules.
2Area of stationary object
If the photosensor is integrated within the display region, then screen-to-body ratio is maintained or increased, but device structure becomes more complex
Solution Approach 1:
The patent combines the display structure and the fingerprint sensing structure into a single integrated system. The light-emitting unit is incorporated within the display panel, and the photosensor is positioned to receive light reflected from the fingerprint through the same display region, merging two previously separate functions into one unified structure.
Solution Approach 2:
The display panel itself acts as an intermediary medium that serves dual purposes: it displays visual information and simultaneously transmits light for fingerprint sensing. The light-emitting unit emits light through the display panel, and the photosensor detects reflected light through the same panel, using the display structure as a shared medium for both display and sensing functions.
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
This design maintains or increases the display area while enabling effective identity recognition, such as fingerprint sensing, by integrating the photosensor within the display region, thus alleviating the issue of reduced screen-to-body ratio.
Implementation Method 1
a light-emitting unit, and a photosensor. The light-emitting unit is disposed between the first substrate and the second substrate and overlapped with the first opening
Implementation Method 2
The photosensor is disposed on the first substrate and overlapped with the second opening
Data Source
AI summary
An electronic device includes a first substrate, a second substrate, a light-impermeable layer, a light-emitting unit, and a photosensor. The second substrate is opposite to the first substrate. The light-impermeable layer is disposed between the first substrate and the second substrate and includes a first opening and a second opening. The light-emitting unit is disposed between the first substrate and the second substrate and overlapped with the first opening. The photosensor is disposed on the first substrate and overlapped with the second opening.