Display Controller Infrared Sensor User Presence Detection
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Solution Overview
Problem
Existing display device controllers struggle to accurately detect user presence due to heat interference from the display device itself, leading to incorrect power-saving mode activations.
Innovation Solution
An apparatus and method using a passive infrared sensor, heat source, temperature detector, and correction mechanism to determine user presence by correcting infrared data based on the operational situation of the heat source, allowing for accurate user authentication and power management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Difficulty of detecting and measuring
If a passive infrared sensor is used to detect user presence, then user presence detection capability is improved, but detection accuracy deteriorates due to heat interference from the display device
Solution Approach 1:
The patent introduces a heat source as an intermediary element that actively emits infrared light to illuminate the user's face. This mediator enables the infrared camera to capture facial images for authentication while the passive infrared sensor detects user presence, separating the illumination function from the detection function and eliminating interference between them.
Solution Approach 2:
The patent divides the infrared detection system into two independent components: a passive infrared sensor for detecting user presence (infrared light from the user's body) and an infrared camera for capturing facial images. This segmentation allows each component to perform its specific function without interference from the display device's heat, as they operate in different infrared detection modes and purposes.
2Reliability
If the display device operates in normal mode, then display performance is maintained, but false detection of user absence increases due to heat generation
Solution Approach 1:
The patent implements a feedback mechanism where the control unit continuously monitors the operational state of the display device and adjusts the infrared sensor's detection threshold or the heat source's emission intensity accordingly. When the display operates in normal mode generating more heat, the system compensates by adjusting parameters to maintain accurate user presence detection and prevent false absence detection.
3Ease of operation
If automatic login processing is implemented, then user convenience is improved, but system complexity increases due to additional authentication components
Solution Approach 1:
The patent makes the infrared camera serve multiple functions: it captures facial images for authentication processing and can potentially be used for other purposes such as monitoring or additional security verification. This multi-functionality reduces the need for separate dedicated components, thereby limiting the increase in system complexity while enabling automatic login convenience.
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
Effectively differentiates between user presence and absence, enabling automatic login and logout processing while minimizing false triggers caused by heat interference, thus optimizing power usage and user access.
Implementation Method 1
an infrared sensor that passively detects infrared light radiated from an observation target
Implementation Method 2
a heat source arranged proximate the infrared sensor
Data Source
AI summary
An apparatus to detect the presence of a user includes, in one embodiment, an infrared sensor that passively detects infrared light radiated from an observation target, a heat source arranged proximate the infrared sensor, and a determinator that determines whether the observation target is present in response to information changing along with an operational situation of the heat source and infrared data detected by the infrared sensor. A method and a computer program product also perform functions of the apparatus.