OLED Display Sensing Invisible Light via Sensor Panel
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Solution Overview
Problem
Conventional display technologies face challenges in sensing touch or proximity objects on OLED panels due to difficulties in integrating photoconductive layers and invisible light pass filters, which affect the illumination and image quality.
Innovation Solution
A display apparatus featuring an OLED illumination unit that transmits invisible light and a sensor panel positioned below it, with a hole to allow invisible light and shadow sensing, and an optional backlight or front light unit for object detection, enabling efficient sensing without altering the OLED panel configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a photoconductive layer and invisible light pass filter are integrated in the OLED panel, then sensing capability is improved, but manufacturing complexity and difficulty increase
Solution Approach 1:
The sensing system is divided into separate functional modules: the OLED illumination unit remains distinct from the sensor panel, which contains the photoconductive layer and invisible light pass filter. This segmentation allows each component to be optimized independently and simplifies the manufacturing process while maintaining sensing capability.
Solution Approach 2:
An invisible light pass filter is introduced as an intermediary component that selectively transmits invisible light while blocking visible light. This filter acts as a mediator between the OLED illumination unit and the sensor panel, enabling the sensor to detect invisible light patterns without being interfered with by visible display content.
2Measurement precision
If a photoconductive layer and invisible light pass filter are integrated in the OLED panel, then sensing capability is improved, but image quality and illumination quality deteriorate
Solution Approach 1:
By separating the sensing function into a dedicated sensor panel with its own invisible light pass filter, the main OLED illumination unit remains unchanged. This ensures that the visible light transmission and image quality of the OLED panel are not compromised by the presence of sensing components.
Solution Approach 2:
The invisible light pass filter is positioned specifically in the sensor panel area, allowing selective transmission of invisible light only where needed for sensing. The OLED illumination unit maintains its original optical properties for visible light, preserving image quality and illumination performance in the display area.
3Ease of manufacture
If visible light is used as light source for sensing, then sensing is simplified, but OLED illumination unit cannot be used for sensing
Solution Approach 1:
The OLED illumination unit is designed to serve dual functions: displaying visible light images and providing invisible light for sensing. By utilizing the inherent invisible light emission property of OLEDs, the same illumination unit becomes versatile for both display and sensing applications without requiring separate light sources.
Solution Approach 2:
The invisible light pass filter acts as a mediator that enables the OLED illumination unit to be used for sensing. The filter selectively transmits the invisible light component emitted by the OLED while blocking visible light, allowing the OLED to function as both display and sensing light source simultaneously.
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
Enables easy formation of photoconductive layers and reduces the display apparatus thickness, allowing for effective sensing of invisible light without a hole or filter, while maintaining image quality and allowing for touch or proximity interactions.
Implementation Method 1
an organic light emitting diode (OLED) illumination unit including at least one OLED, the OLED illumination unit to transmit an invisible light, and a sensor panel disposed on a lower part of the OLED illumination unit, the sensor panel to sense at least one of the invisible light and a shadow
Implementation Method 2
an organic light emitting diode (OLED) illumination unit including at least one OLED, the OLED illumination unit to transmit an invisible light
Data Source
AI summary
A display apparatus that may enable sensing a multi-touch and a proximity object is provided. The display apparatus may display an image generated by the object on an organic light emitting diode (OLED) display panel, and may sense an invisible light that may be reflected by the object and may have entered through a hole.