Dual IR Detection Switching for Accurate Screen Control
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Solution Overview
Problem
The conventional dual-IR distance detection system in mobile terminals has low accuracy, making it impossible to accurately control the ON and OFF states of the screen, which affects user experience.
Innovation Solution
The method involves interrupting far-channel IR detection and enabling near-channel IR detection when a timing start condition is met, using a higher transmission power for far-channel IR detection than near-channel IR detection, allowing for accurate control of screen states based on distance detection results.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the far-channel IR detection is used continuously, then the device complexity is reduced, but the distance detection accuracy deteriorates when the obstacle is too close to the screen
Solution Approach 1:
The patent implements dynamic switching between far-channel and near-channel IR detection modes based on real-time distance measurement. When the detected distance falls within the near-channel range, the system automatically switches to near-channel detection mode to maintain high accuracy for close obstacles, thereby resolving the contradiction between system simplicity and measurement precision.
Solution Approach 2:
The patent changes the detection parameter (channel mode) based on the detected distance value. By adjusting which detection channel is active according to the measured distance, the system achieves both low complexity in normal operation and high precision when needed, resolving the technical contradiction.
2Measurement precision
If the near-channel IR detection is switched based on far-channel detection results, then the distance detection accuracy improves, but the reliability deteriorates when far-channel detection is abnormal
Solution Approach 1:
The patent performs preliminary actions by pre-defining switching thresholds and detection ranges before actual detection occurs. This preparation ensures that when distance measurement indicates a need for near-channel detection, the system can reliably switch without depending on the reliability of far-channel detection results, thus improving both accuracy and reliability.
Solution Approach 2:
The patent implements feedback mechanisms where the distance detection results continuously inform the switching decision between channels. This feedback loop ensures reliable operation by using actual measured distances to guide mode selection, making the system adaptive and reliable under various conditions.
3Length of stationary object
If the far-channel IR detection transmission power is increased, then the detection range is extended, but the near-channel detection accuracy deteriorates due to interference
Solution Approach 1:
The patent segments the detection function into two separate channels with distinct transmission power levels. The far-channel detection uses higher power for extended range, while the near-channel detection uses lower power to avoid interference and maintain accuracy for close obstacles. This segmentation resolves the contradiction by allowing each channel to optimize its power independently.
Solution Approach 2:
The patent applies local quality by assigning different transmission power characteristics to different detection channels based on their specific operational requirements. The near-channel detection uses lower power locally optimized for close-range accuracy, while far-channel detection uses higher power for extended range, resolving the power range accuracy contradiction.
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 improves the distance detection accuracy and enables precise control of screen states, enhancing user experience by ensuring accurate switching between far-channel and near-channel IR detection.
Implementation Method 1
distance detection is performed by a mobile terminal through an infrared (IR) sensor
Implementation Method 2
an IR light beam at a first transmission power is emitted by the emitter for the distance detection
Data Source
AI summary
The present disclosure provides a screen ON-and-OFF state control method and a mobile terminal. The screen ON-and-OFF state control method includes: during a distance detection through a far-channel IR detection, when a timing start condition for a near-channel IR detection has been met, interrupting the far-channel IR detection, and enabling the near-channel IR detection for the distance detection; and controlling ON and OFF states of a screen of the mobile terminal in accordance with a distance detection result of the near-channel IR detection. A transmission power of an IR light beam corresponding to the far-channel IR detection is greater than a transmission power of an IR light beam corresponding to the near-channel IR detection.