Optical Fingerprint Sensor Gap Design for Display Panels
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Solution Overview
Problem
The sensitivity of optical fingerprint identification in display panels is low due to a serious loss of visible light, leading to inadequate utilization and impaired user experience.
Innovation Solution
The implementation of optical fingerprint identification structures with a display region and a sensing region, where the cathode metal layer is separated by a gap to allow direct reflection of visible light into the optical sensor, reducing the need for light to pass through a semitransparent cathode and enhancing light utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If an optical fingerprint identification structure is integrated in the display panel, then the screen-to-body ratio is improved, but the visible light utilization rate deteriorates
Solution Approach 1:
The display panel is divided into a display region and a sensing region. The sensing region contains the optical fingerprint identification structure with an optical sensor, while the display region contains the light-emitting element. This spatial segmentation allows the fingerprint sensing function to be integrated without compromising the display area, thereby improving screen-to-body ratio while managing light loss through regional functional separation.
Solution Approach 2:
The cathode metal layer is designed with a three-dimensional structure including a first cathode metal layer extending to the pixel definition layer near the display region and a second cathode metal layer extending away from the display region, separated by a gap. This vertical and horizontal dimensional arrangement creates a light reflection path that directs visible light from the light-emitting element through the gap to the optical sensor, improving light utilization while maintaining the integrated structure.
2Adaptability or versatility
If an optical fingerprint identification structure is integrated in the display panel, then the device functionality is improved, but the sensitivity of fingerprint identification deteriorates
Solution Approach 1:
The cathode metal layer is designed with non-uniform distribution: the first cathode metal layer extends to the pixel definition layer close to the display region to maintain display functionality, while the second cathode metal layer extends away from the display region to create an effective light reflection path. The gap between the two layers is strategically positioned to allow visible light to reach the optical sensor, optimizing both display performance and fingerprint sensing sensitivity.
Solution Approach 2:
The gap between the first cathode metal layer and the second cathode metal layer acts as an intermediary structure that facilitates light transmission. This gap allows visible light emitted by the light-emitting element to pass through and reach the optical sensor after reflection, serving as a light pathway that connects the display region and sensing region, thereby improving fingerprint identification sensitivity without compromising display functionality.
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 improves the sensitivity of optical fingerprint identification by increasing the amount of visible light entering the sensor, thereby enhancing user experience and reducing manufacturing costs.
Implementation Method 1
light emitted by the light-emitting element is allowed to enter the optical sensor through the gap after being reflected by a fingerprint
Data Source
AI summary
The present disclosure provides a display panel, a manufacturing method thereof, and a display device. The display panel includes a plurality of optical fingerprint identification structures, each optical fingerprint identification structure includes a display region and a sensing region, the display region includes a driving circuitry layer, a planarization layer, a pixel definition layer, and a light-emitting element, and the light-emitting element includes an anode, a light-emitting material layer and a cathode. The sensing region includes a sensing region opening, an optical sensor and a cathode metal layer, the cathode metal layer includes a first cathode metal layer and a second cathode metal layer, and the first cathode metal layer is separated from the second cathode metal layer by a gap, so that light emitted by the light-emitting element is allowed to enter the optical sensor through the gap after being reflected by a fingerprint.