Smartphone Light Sensor Interference Mitigation
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Solution Overview
Problem
Image sensors in smartphones, installed in the display region, face reduced image sensing quality due to receiving light signals from both the sensing target and adjacent display pixels, leading to interference and decreased performance.
Innovation Solution
The electronic device employs a dual light-emitting element system with different driving signals in separate regions to minimize interference, where the first light-emitting element is driven by a first duty cycle with a lower duty ratio than the second, allowing the light sensor to operate more effectively during sensing modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the image sensor is installed in the display region to enable light sensing function, then the device integrates sensing capability, but the image sensing quality deteriorates due to receiving light signals from adjacent display pixels
Solution Approach 1:
The display screen is divided into a first display region and a second display region, with the image sensor disposed between them. The first light-emitting element corresponds to the first display region and the second light-emitting element corresponds to the second display region. This spatial segmentation allows the image sensor to receive light signals from different regions separately, enabling it to distinguish between display light and external scene light, thereby improving image sensing quality while maintaining integrated sensing capability.
2Illumination intensity
If the image sensor receives light signals from adjacent display pixels, then the display function is maintained, but the image sensing quality reduces due to light interference
Solution Approach 1:
The first light-emitting element and the second light-emitting element are driven by driving signals with different duty cycles. The first driving signal has a first duty cycle and the second driving signal has a second duty cycle, creating periodic light emission patterns. During image sensing, the image sensor can identify and filter out light signals based on their periodic characteristics, distinguishing display light from external scene light, thereby maintaining display function while improving image sensing quality.
Solution Approach 2:
The system uses the different duty cycles of the driving signals as a feedback mechanism. The image sensor detects light signals and the controller processes this information to distinguish between display-generated light and external scene light based on the known duty cycle patterns. This feedback approach enables the system to compensate for display light interference and improve image sensing accuracy while maintaining normal display operation.
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 approach enhances the light sensing capability of the image sensor by reducing the impact of light reflections or scatterings from adjacent display elements, resulting in improved image sensing quality without compromising display effects.
Implementation Method 1
The light sensor is disposed in the first region and is configured to receive a light signal
Data Source
AI summary
An electronic device, having a first region and a second region adjacent to the first region, is provided. The electronic device includes a light sensor, a first light-emitting element, and a second light-emitting element. The light sensor is disposed in the first region and is configured to receive a light signal. The first light-emitting element is disposed in the first region. The second light-emitting element is disposed in the second region. The first light-emitting element is driven by a first driving signal. The first driving signal has a first duty cycle. The second light-emitting element is driven by a second driving signal. The second driving signal has a second duty cycle. The first duty cycle has a first duty ratio. The second duty cycle has a second duty ratio. The first duty ratio is less than the second duty ratio. The electronic device provides a better light sensing function.