Under-display Sensor Synchronization to Reduce Luminance Alterations
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Solution Overview
Problem
Power-limited computing devices with under-display sensors face interference issues due to electromagnetic radiation emitted by sensors, causing luminance alterations that are visibly undesirable to users.
Innovation Solution
Synchronizing the operation of under-display sensors with the display operation by emitting electromagnetic radiation at opportune times, such as just before pixel programming or during specific portions of the emission period, to minimize visible effects of luminance alterations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If sensors are positioned underneath the display to enable pass-through operation, then the display size and shape are improved, but image quality deteriorates due to increased noise
Solution Approach 1:
The patent segments the display operation into distinct periods: emission periods when pixels are actively displaying light, and non-emission periods when pixels are not emitting. By scheduling sensor operations during non-emission periods, the system separates sensor function from display function in time, eliminating interference while maintaining both full display area and image quality.
2Adaptability or versatility
If sensors emit electromagnetic radiation through the display, then sensor function is enabled, but display performance deteriorates due to luminance alterations
Solution Approach 1:
The patent implements periodic action by alternating between emission periods and non-emission periods in the display operation. Sensors are activated during non-emission periods when pixels are not emitting light, creating a periodic cycle where display and sensor functions take turns. This temporal separation allows both functions to operate reliably without interference.
Solution Approach 2:
The patent applies preliminary action by programming pixel states during non-emission periods before the emission periods begin. This allows the display to prepare the next frame of image data while maintaining a non-emitting state, creating a window of opportunity for sensor operation without affecting the current display output.
3Measurement precision
If sensors operate continuously under the display, then measurement accuracy is improved, but visual interference increases due to persistent luminance alterations
Solution Approach 1:
The system uses periodic action to activate sensors only during non-emission periods rather than continuously. This periodic sensor operation maintains measurement capability while eliminating persistent visual interference, as the sensors are dormant during emission periods when the display is actively showing content.
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 synchronization technique reduces the visibility of interference effects, ensuring a more stable and user-friendly display experience by minimizing the duration and impact of luminance changes caused by sensor emissions.
Implementation Method 1
one or more sensors positioned underneath the display and configured to emit electromagnetic radiation through the display during operation
Implementation Method 2
cause pixels of the plurality of pixels to emit light during an emission period of the frame
Data Source
AI summary
An example method includes programming, based on image data of a frame of a plurality of frames and during a non-emission period of the frame, pixels of a plurality of pixels of a display of a computing device; causing pixels of the plurality of pixels to emit light during an emission period of the frame, wherein an amount of light emitted by the pixels during the emission period is based on the programming; and synchronizing operation of one or more sensors and operation of the plurality of pixels by at least causing the one or more sensors to emit, during a particular portion of the emission period of the frame, electromagnetic radiation through the display.