Display Panel Layout for Biometric Sensing Without Resolution Loss
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Solution Overview
Problem
Existing display devices face challenges in integrating biometric information recognition capabilities without compromising the resolution of the display panel, often requiring additional space for sensor driving circuits.
Innovation Solution
A display device design that includes a display panel with a light emitting device and a photo-detector, where the pixel driving circuit and sensor driving circuit are overlapped with the light emitting device and photo-detector, respectively, allowing for reduced space usage and increased resolution by ensuring space for sensor driving circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If additional sensor driving circuits are added to enable biometric recognition, then biometric information recognition capability is improved, but the space required for circuits increases and display panel resolution deteriorates
Solution Approach 1:
The patent applies vertical stacking by placing the sensor driving circuit in the second circuit layer directly beneath the photo-detector in the display layer, utilizing the vertical dimension to accommodate additional circuitry without expanding the horizontal footprint. This allows the sensor driving circuit to be positioned within the pixel region boundaries, enabling biometric recognition functionality while preserving display panel resolution.
Solution Approach 2:
The sensor driving circuit is nested within the pixel region by positioning it in the second circuit layer underneath the photo-detector structure. The photo-detector in the first circuit layer and the sensor driving circuit in the second circuit layer form a nested configuration where the sensor driving circuit is housed within the spatial envelope of the pixel region, eliminating the need for separate external circuit space.
2Adaptability or versatility
If sensor driving circuits are positioned in separate regions, then biometric sensing function is improved, but the overall device area increases
Solution Approach 1:
The patent transitions from horizontal placement to vertical stacking by positioning the sensor driving circuit in the second circuit layer beneath the photo-detector. This vertical dimension utilization allows the sensor driving circuit to be integrated within the pixel region's vertical profile rather than requiring additional horizontal space, thereby maintaining compact display panel area while enabling biometric sensing 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 ensures sufficient space for biometric information recognition while maintaining or enhancing the display panel's resolution, enabling efficient integration of biometric sensing without sacrificing display quality.
Implementation Method 1
a photo-electric converting layer interposed between the first electrode and the second electrode to convert incident light to an electrical signal
Implementation Method 2
a light emitting layer interposed between the first electrode and the second electrode to emit red light, blue light, or green light
Data Source
AI summary
A display device including: a display layer including a light emitting device, a photo-detector, and a dummy device; and a circuit layer including a pixel driving part, which is connected to the light emitting device, and a sensor driving part which is connected to the photo-detector, wherein the light emitting device and the dummy device are overlapped with the pixel driving part, and wherein the photo-detector is overlapped with the sensor driving part.