Optical Sensor Light Emission Timing Control
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Solution Overview
Problem
The challenge is to minimize distortion in electronic device displays caused by optical sensor modules disposed on the rear surface, which can lead to quality issues due to light interference from light-emitting elements passing through display elements like OLEDs, necessitating efficient placement and timing control of light emitting elements within the optical sensor module.
Innovation Solution
An electronic device with an optical sensor module positioned below the display, featuring multiple light emitting elements overlapping different signal lines, controlled by a processor to emit light at specific times based on the off-time points of the signal lines corresponding to display brightness, thereby minimizing interference and distortion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the optical sensor module is disposed on the rear surface of the display, then the display can be expanded to occupy the front surface of the electronic device, but light from light emitting elements passes through display elements causing distortion phenomena
Solution Approach 1:
The light emitting elements emit light in advance during the off-time of signal lines before the display elements are activated. This preliminary light emission allows the optical sensor to detect external objects before the display turns on, preventing light interference and distortion while maintaining expanded display area.
Solution Approach 2:
The light emitting elements operate periodically during specific off-time intervals of the display signal lines. By synchronizing light emission with the periodic off-states of different signal lines, the system achieves continuous object detection capability while avoiding continuous light interference with the display.
2Measurement precision
If multiple light emitting elements are used in the optical sensor module, then detection capability is improved, but control complexity increases due to need for precise timing synchronization with display signal lines
Solution Approach 1:
Each light emitting element is controlled to emit light in advance during the off-time of its corresponding signal line. The processor determines off-time points for each signal line and schedules light emission accordingly, simplifying the control logic while maintaining precise timing synchronization for multiple elements.
Solution Approach 2:
The optical sensor module uses multiple light emitting elements positioned to overlap with different signal lines. Each element is independently controlled based on the timing of its corresponding signal line's off-time, allowing segmented control that simplifies synchronization while improving detection precision through multiple detection points.
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 effectively reduces distortion and maintains display quality by synchronizing light emission with display brightness and off-times, improving the optical sensor's sensitivity and functionality while ensuring efficient internal component placement.
Implementation Method 1
a light receiving element including light receiving circuitry configured to collect light from the first light emitting element and/or the second light emitting element that is reflected and received from an external object
Data Source
AI summary
An example electronic device includes: a housing: a display including a plurality of signal lines; an optical sensor module including first and second light emitting elements respectively overlapping first and second signal lines, and a light receiving element configured to collect light from the first and/or second light emitting elements that is reflected and received from an external object; and a processor. The processor is configured to control the first light emitting element based on an off-time point of time of the first signal line corresponding to brightness of the display such that the first light emitting element emits light at a first light-emitting point of time, and to control the second light emitting element based on a time difference between off-time points of time of the first and second signal lines such that the second light emitting element emits light at a second light-emitting point of time.