Synchronized Optical Emitters Under Displays
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Solution Overview
Problem
The integration of optical emitters or transceivers under display surfaces in electronic devices can interfere with the display's operation, causing unwanted bias currents and image distortions due to their optical emissions, which degrade the user experience and image quality.
Innovation Solution
Synchronizing the illumination timing of the optical emitter/transceiver with the light-emitting display's timing to minimize interference and reduce image distortion, allowing the optical transceiver to emit or receive light in sync with the display's operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If an optical emitter or transceiver is positioned under the display, then the display area is increased, but the optical emissions interfere with the display operation causing image distortion
Solution Approach 1:
The optical emitter is activated only during specific time periods (e.g., during display refresh intervals or in synchronization with display timing), rather than continuously. This periodic operation allows the display to refresh without interference from optical emissions, resolving the contradiction between maximizing display area and preventing optical interference.
Solution Approach 2:
The system pre-coordinates the operation timing of the optical emitter with the display refresh cycle. By planning and synchronizing the emitter activation with display timing signals before operation begins, the system ensures that optical emissions occur only when the display is not sensitive to interference, thus maintaining both large display area and image quality.
2Reliability
If the optical emitter emits light continuously, then the sensing function is maintained, but the display operation is interfered with and user experience is degraded
Solution Approach 1:
The optical emitter operates periodically rather than continuously, activating only during time windows that do not conflict with display refresh operations. This maintains sensing reliability by ensuring periodic measurement capability while eliminating continuous interference that would degrade user experience.
Solution Approach 2:
The system dynamically adjusts the operation timing and duration of the optical emitter based on display state and sensing requirements. By making the emitter operation adaptive and flexible rather than static and continuous, the system maintains sensing functionality while minimizing interference with display operation and user experience.
Data Source
AI summary
In some embodiments, a device includes a light-emitting display, and an optical emitter positioned behind the light-emitting display. The optical emitter is configured to emit light through the light-emitting display. A processor is configured to synchronize a first illumination timing of the optical emitter and a second illumination timing of the light-emitting display. In some embodiments, a device includes an optical transceiver processor and a display processor. The display processor is configured to output timing information to a light-emitting display and to the optical transceiver processor, and the optical transceiver processor is configured to cause an optical transceiver to emit or receive light in synchronization with the timing information output by the display processor.