OLED Display Barrier for IR Sensor Crosstalk
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Solution Overview
Problem
OLED displays face challenges with brightness and lifetime when combined with IR and ambient light sensors, as the sensors can react to edge-emitted photons from the display, leading to reduced intensity and shorter lifespan.
Innovation Solution
A barrier, such as a polymer material like carbon black, is fabricated between the OLED display and the sensors to block edge-emitted photons, preventing them from being detected by the sensors and allowing for optimized emission and absorption properties without interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If OLED display and sensors are combined on the same substrate, then device integration is improved, but sensor accuracy deteriorates due to edge-emitted photon interference
Solution Approach 1:
The patent divides the substrate into distinct functional zones: an OLED display region and separate sensor regions (ambient light sensor and IR sensor). This spatial segmentation prevents edge-emitted photons from the display from interfering with sensor measurements, while maintaining integration on the same substrate. The display region and sensor regions are positioned to minimize optical crosstalk.
Solution Approach 2:
The patent applies different material properties to different regions of the substrate. The OLED region uses organic electroluminescent materials optimized for light emission, while the sensor regions use materials with specific optical absorption characteristics for detecting ambient light and IR wavelengths. This local differentiation of material properties enables each region to perform its function optimally without interfering with the other.
2Illumination intensity
If OLED material is optimized for efficient photon emission, then display brightness is improved, but photon absorption increases leading to reduced lifetime
Solution Approach 1:
The patent optimizes the optical parameters of the OLED material to achieve high emission efficiency in the visible spectrum while minimizing absorption in the same spectrum. By carefully selecting organic compounds with appropriate HOMO-LUMO energy gaps and emission wavelengths, the display achieves high brightness while reducing self-absorption losses that would otherwise generate heat and degrade the organic materials over time.
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 solution enhances the OLED display's intensity and extends its lifespan by preventing sensor interference, allowing for efficient coexistence of display and sensing functions on the same substrate without the need for additional optical filters.
Implementation Method 1
A barrier, such as a polymer material like carbon black, is fabricated between the OLED display and the sensors to block edge-emitted photons
Implementation Method 2
An OLED is a light-emitting diode (LED) in which the emissive electroluminescent layer is a film of organic compound which emits light in response to an electric current
Implementation Method 3
OLED material, illuminating in a given spectrum, will also absorb photons of somewhat shorter wavelength than that which is emitted. The shorter wavelength, which represents higher energy, is required due to the nature of photon emission and absorption in OLED material. The photon must have enough energy to not only create the 'exciton' molecule, a special polarization of the polymer representing a higher electron energy level, but to disassociate the exciton into a free electron and hole pair at the diode junction.
Data Source
AI summary
A method and apparatus for an OLED display system is presented. A substrate is provided and a display is provided on the substrate. At least one sensor is also provided on the substrate. A barrier is provided on the substrate between the display and said the least one sensor, the barrier blocking emissions from the display from being sensed by the at least one sensor.