Display Sensor Layout for Under-Display Fingerprint Sensing
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Solution Overview
Problem
Existing electronic devices with optical sensors increase the area of the light receiving region, which can lead to design constraints and inefficiencies.
Innovation Solution
The electronic device incorporates a light receiving element with a larger area than the light emitting layer, positioned in a different layer and non-overlapping with the light emitting layer, allowing for efficient integration and sensing without increasing the overall sensor area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a sensor in the optical method is included, then fingerprint recognition capability is improved, but the area of the light receiving region increases
Solution Approach 1:
The patent applies dimensionality change by stacking the light receiving element in a different layer (thickness direction) than the light emitting layer, allowing the light receiving element to have a larger area without increasing the planar footprint of the display device. This vertical arrangement resolves the contradiction between needing large light receiving area for optical fingerprint recognition and maintaining compact device area.
2Measurement precision
If the light receiving layer area is increased, then sensing capability is improved, but the overall device area increases
Solution Approach 1:
The patent implements nesting by placing the light receiving element within the same device structure as the light emitting element, specifically in a different layer. The light receiving element is positioned to utilize the vertical space within the device, allowing it to have a larger sensing area while being nested within the overall device footprint, thus improving sensing capability without increasing the external device area.
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 configuration enables effective fingerprint recognition and image display without enlarging the sensor area, optimizing the device design and functionality.
Implementation Method 1
a light emitting layer disposed between the hole transport region and the electron transport region
Implementation Method 2
a light receiving element includes a light receiving layer which is provided between the first electrode and the second electrode
Data Source
AI summary
An electronic device including: a base layer; a display element layer disposed on the base layer and including a pixel defining layer that includes an opening, and a light emitting element and a light receiving element, which are separated by the pixel defining layer; and an input sensing layer disposed on the display element layer, wherein each of the light emitting element and the light receiving element includes: a first electrode; a hole transport region disposed on the first electrode; an electron transport region disposed on the hole transport region; and a second electrode disposed on the electron transport region, wherein the second electrode is a common layer in the light emitting element and the light receiving element, the light emitting element comprises a light emitting layer disposed between the hole transport region and the electron transport region, and the light receiving element comprises a light receiving layer which is provided between the first electrode and the second electrode and disposed in a layer different from the light emitting layer in a thickness direction of the electronic device.