Liquid Lens Control Device Temperature Sensing Noise
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Solution Overview
Problem
Existing camera modules with liquid lenses face temperature compensation and sensing errors due to switching operations of the lens driver, which can introduce noise and affect the accuracy of temperature sensing and compensation.
Innovation Solution
A liquid lens control apparatus that synchronizes the heater driving timing and temperature sensing timing with periods avoiding the switching time of the lens driver, maintaining switching states during temperature sensing and compensation operations to minimize noise influence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the lens driver performs switching operations to control the liquid lens interface, then the lens focusing and stabilization functions are achieved, but noise is generated that interferes with temperature sensing accuracy
Solution Approach 1:
The system performs temperature sensing during periods when the lens driver switching is inactive or in a stable state. The control unit schedules temperature measurement operations to occur during intervals when no switching transitions are occurring, thereby avoiding noise contamination from the switching operations.
Solution Approach 2:
The control unit acts as an intermediary that coordinates between the lens driver and temperature sensing unit. It manages the timing and scheduling of both operations to ensure that temperature sensing occurs during electrically quiet periods, effectively mediating between the conflicting operational requirements.
2Duration of action of stationary object
If the temperature sensing unit operates during lens driver switching, then continuous temperature monitoring is achieved, but temperature compensation errors occur due to switching noise
Solution Approach 1:
The system implements periodic temperature sensing during intervals when the lens driver operates in a stable state. Rather than continuous sensing during all switching operations, the system periodically measures temperature during clean intervals, balancing monitoring needs with accuracy requirements.
Solution Approach 2:
The control unit schedules temperature sensing operations to occur during predetermined time windows when switching activity is minimized or stable, proactively avoiding noise periods rather than reactively filtering them.
3Temperature
If the heater operation state changes to compensate for temperature variations, then temperature control is achieved, but sensing errors occur during the transition periods
Solution Approach 1:
The system schedules temperature sensing operations to occur before heater state transitions begin or after they have completed and stabilized. By sensing temperature during stable periods and using that data to control heater operation, the system avoids measuring during the noisy transition phases.
Solution Approach 2:
The control unit uses temperature sensing feedback to regulate heater operation, creating a closed-loop system where heating decisions are based on stable temperature measurements taken during quiet periods, which then influences subsequent heater state changes.
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 accuracy of temperature sensing and compensation by avoiding noise generated by the lens driver's switching operations, ensuring precise temperature control and reducing errors.
Implementation Method 1
a temperature sensing unit sensing a temperature of the liquid lens
Implementation Method 2
a heater whose operation state is changed according to the temperature
Implementation Method 3
a liquid lens that electrically adjusts a curvature of an interface between two types of liquids
Data Source
AI summary
A liquid lens control apparatus according to an embodiment includes: a liquid lens containing a first liquid and a second liquid that form an interface with a first electrode and a second electrode; a lens driver applying a voltage to the first electrode and the second electrode to control the interface, and including a plurality of switching elements; a temperature sensing unit sensing a temperature of the liquid lens; and a control unit controlling the lens driver so that the interface forms a target interface, wherein the control unit controls switching states of the plurality of switching elements of the lens driver to be maintained during a temperature sensing period in which the temperature sensing unit operates.