Dual-Chip Proximity Sensor for Accurate Display Control
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Solution Overview
Problem
In intelligent terminals, the sensitivity of infrared receivers is low due to long distances between the infrared emitter and receiver, leading to inaccurate control of display screen on and off states, as direct emission and diffraction cause reduced intensity changes in detected reflected light.
Innovation Solution
The use of a dual-chip configuration with a first light emitter and receiver integrated in a two-in-one chip, and a second light receiver farther away, allows for improved light intensity change detection by varying the distance between the sensors, enhancing sensitivity and accuracy in determining proximity to an external object.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the infrared emitter and receiver are placed far apart, then the display screen can be controlled for distant objects, but the infrared receiver cannot detect reflected light accurately due to long distance attenuation
Solution Approach 1:
The patent divides the detection system into two independent detection channels: a first detection channel with the infrared emitter and receiver close together for detecting nearby objects, and a second detection channel with the emitter and receiver far apart for detecting distant objects. This segmentation allows each channel to be optimized for its specific detection range, resolving the contradiction between close and far distance detection requirements.
2Reliability
If the infrared emitter and receiver are placed close together, then the infrared receiver can detect reflected light from nearby objects, but direct emission and diffraction cause reduced intensity changes for distant objects
Solution Approach 1:
The patent creates two separate detection channels with different emitter-receiver distances. The first channel uses close spacing for reliable near-field detection, while the second channel uses far spacing for accurate distant object detection. This segmentation eliminates the need to compromise between close and far detection requirements in a single channel.
Solution Approach 2:
Each detection channel is optimized with specific local characteristics: the first channel has short emitter-receiver distance optimized for detecting nearby objects, while the second channel has long emitter-receiver distance optimized for detecting distant objects. This local optimization allows each channel to perform its specific function effectively without interference from the other.
3Device complexity
If a single infrared detection system is used, then the device structure is simple, but the system cannot accurately determine proximity due to conflicting detection requirements
Solution Approach 1:
The patent segments the detection system into two independent channels with different emitter-receiver distances, allowing each channel to be optimized for its specific detection range. This segmentation enables accurate proximity determination by using both channels together, as they provide complementary information for different distance ranges.
Solution Approach 2:
The patent makes the detection system multi-functional by implementing both a first detection channel for nearby objects and a second detection channel for distant objects within the same device. This universal design allows the system to accurately detect proximity across various distances without requiring multiple separate devices.
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 configuration improves the accuracy of determining the proximity of the terminal to an external object, leading to precise control of display screen states, enhancing user experience by reducing errors in on and off state management.
Implementation Method 1
The infrared emitter emits infrared light, and an object reflects the infrared light to form reflected light
Implementation Method 2
an object reflects the infrared light to form reflected light
Implementation Method 3
After the infrared receiver receives the reflected light, the proximate state and distant state of the intelligent terminals are determined, based on intensity of the reflected light
Implementation Method 4
a part of the infrared light emitted by the infrared emitter can directly enter the infrared receiver due to diffraction of the infrared light inside the intelligent terminals
Data Source
AI summary
In a method of controlling display screen states and an apparatus, the method includes following actions. A signal emitter emits a detection signal outward. A second signal receiver receives a reflection signal of the detection signal formed by an external object. Based on intensity of the reflection signal received by the second signal receiver, distance states between terminals and the object are determined. The method controls the display screen states based on the distance states. Since the signal receiver away from the signal emitter precisely detects the distance states between terminals and the object, the method controls the display screen states of the terminals.