In-Plane Sensor-Embedded Display Panels for Biometric Recognition
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Solution Overview
Problem
Existing display devices face performance degradation and design limitations when biometric sensors are disposed under the display panel or manufactured as separate modules, affecting usability and integration with biometric recognition technologies.
Innovation Solution
A sensor-embedded display panel is developed with a light emitting element and a light absorption sensor integrated on a substrate, where the light absorption sensor is arranged in parallel with the light emitting layer to absorb specific wavelength spectra, utilizing organic materials with controlled sublimation temperatures and energy bandgaps for efficient biometric recognition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the sensor is disposed under the display panel, then the biometric recognition function is achieved, but the recognition performance is degraded due to interference from display panels and films
Solution Approach 1:
The patent merges the light emitting element and light absorption sensor into a single integrated structure where the sensor is formed in the same layer as the display element. This integration eliminates the need for separate sensor modules and reduces the number of interfering films between the sensor and the object being recognized, thereby maintaining recognition performance while achieving biometric functionality.
Solution Approach 2:
The patent transitions from a vertical stacking approach (sensor under display panel) to an in-plane integration approach where the light absorption sensor and light emitting element are formed in the same layer. This dimensional reorganization allows the sensor to be positioned closer to the object recognition surface without being blocked by multiple film layers, thus improving recognition accuracy.
2Measurement precision
If the sensor is manufactured as a separate module and mounted outside the display panel, then the recognition performance is maintained, but design flexibility and usability are limited
Solution Approach 1:
The patent combines the sensor functionality with the display panel manufacturing process by forming the light absorption sensor in the same layer as the light emitting element. This merging allows the sensor to be produced using the same thin-film deposition techniques as the display, enabling seamless integration and enhanced design flexibility while maintaining recognition performance.
Solution Approach 2:
The patent creates a multi-functional layer that serves both as the light emitting element for display purposes and as the light absorption sensor for biometric recognition. This universal layer performs dual functions, eliminating the need for separate sensor modules and enabling greater adaptability in device design and application scenarios.
3Ease of manufacture
If organic materials with different sublimation temperatures are used in the light emitting element and light absorption sensor, then material compatibility is improved, but manufacturing complexity increases
Solution Approach 1:
The patent specifies that the difference in sublimation temperatures between the first organic material (in the light emitting element) and the second organic material (in the light absorption sensor) should be 150°C or less. This parameter control ensures that both materials can be deposited in the same vacuum chamber without excessive temperature differences, simplifying the manufacturing process while maintaining material compatibility.
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 integrated sensor-embedded display panel enhances performance and usability by allowing seamless integration of biometric recognition capabilities without degrading display functionality, improving design flexibility and recognition accuracy.
Implementation Method 1
The light absorbing layer may be configured to absorb light of a red wavelength spectrum, a green wavelength spectrum, a blue wavelength spectrum, an infrared wavelength spectrum, or any combination thereof
Implementation Method 2
the light absorption sensor may be configured to absorb light that is emitted from at least one of the first, second, or third light emitting elements and is reflected by the recognition target and to convert the reflected light into an electrical signal
Data Source
AI summary
A sensor-embedded display panel includes a substrate, a light emitting element on the substrate and including a light emitting layer, and a light absorption sensor on the substrate and including a light absorbing layer arranged in parallel with the light emitting layer along an in-plane direction of the substrate. The light absorbing layer is configured to absorb light of a red wavelength spectrum, a green wavelength spectrum, a blue wavelength spectrum, or any combination thereof. The light emitting layer includes a first organic material and the light absorbing layer includes a second organic material. A difference between respective sublimation temperatures of the first and second organic materials is less than or equal to about 150° C., wherein each sublimation temperature is a temperature at which a weight reduction of 10% relative to the initial weight occurs during thermogravimetric analysis under an ambient pressure of about 10 Pa or less.