Under-Display Light Sensor PWM Timing Extension
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Solution Overview
Problem
In modern consumer electronics, light sensors under the display panel are affected by display light, leading to distorted sensing results due to insufficient OFF time in PWM dimming control signals, making it difficult for existing computational analysis methods to exclude display light components effectively.
Innovation Solution
Extending the OFF time of one or more driving pulse cycles in the PWM dimming control signal to provide sufficient duration for the light sensor to complete integration operations, ensuring that sensing results do not include display light components, and allowing the light sensor to execute integration operations during extended times without additional resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If the light sensor is disposed under the display panel to maximize display size, then the screen-to-body ratio is improved, but the sensing results are distorted due to display light interference
Solution Approach 1:
The PWM dimming control signal is segmented into multiple driving pulse cycles, with at least one cycle having an extended OFF time. This temporal segmentation allows the light sensor to perform integration operations during the extended OFF period when display light is not emitted, thereby obtaining accurate ambient light sensing results without interference from display light.
2Measurement precision
If computational analysis methods are used to exclude display light components from sensing results, then the sensing accuracy is improved, but additional software and hardware resources are required
Solution Approach 1:
Instead of performing computational analysis after sensing to exclude display light components, the system performs preliminary action by extending the OFF time of PWM driving pulse cycles before the light sensor performs integration. This prevents display light interference at the source, eliminating the need for subsequent computational corrections and reducing software and hardware resource requirements.
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 effectively prevents display light interference in light sensing results, eliminating the need for complex computational corrections and ensuring accurate ambient light sensing without additional hardware or software requirements.
Implementation Method 1
the light sensor includes a light sensing unit and a control circuit
Data Source
AI summary
The present application relates to a display system with a light sensor and a control method thereof. The display system comprises a display module and a light sensor. The display module comprises a driving circuit for generating a driving signal. Said driving signal comprises a plurality of periodic pulse waves. The OFF time of one of the periodic pulse waves is extended to an extended time which is greater than the OFF time of the remaining periodic pulse waves. This ensures that the sensing result of the light sensor may not include the contribution of display light.