Liquid Lens Camera Module Temperature Compensation
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Solution Overview
Problem
Camera modules with multiple lenses face challenges in maintaining resolution and accuracy due to temperature-induced changes in the liquid lens interface, leading to increased size and power consumption, as well as decreased optical performance.
Innovation Solution
A camera module that includes a liquid lens assembly with a temperature sensor, detection unit, and compensation unit to adjust the interface curvature by controlling the driving voltage and heating signals, ensuring consistent diopter adjustment and spatial frequency response across temperature changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a liquid lens is used to adjust interface curvature electrically, then the size of the camera module is reduced and power consumption decreases, but the interface deforms according to temperature changes causing accuracy deterioration
Solution Approach 1:
The patent applies parameter changes by detecting temperature variations and adjusting the driving voltage applied to the liquid lens accordingly. The controller modifies electrical parameters (voltage) based on temperature sensor readings to compensate for thermal deformation of the liquid-liquid interface, thereby maintaining optical accuracy while using a compact liquid lens structure
Solution Approach 2:
The patent implements feedback control through a temperature sensor that continuously monitors the temperature of the liquid lens and provides signals to the controller. The controller uses this feedback information to dynamically adjust the driving voltage, creating a closed-loop system that maintains interface curvature accuracy despite temperature fluctuations
2Adaptability or versatility
If multiple lenses are combined and directly moved to implement zoom and focusing functions, then various photographing functions are achieved, but the size of the optical device increases
Solution Approach 1:
The patent applies multi-functionality by enabling a single liquid lens to perform multiple optical functions (focusing, zooming, and potentially OIS) that traditionally required separate lens assemblies. By electrically adjusting the interface curvature of one liquid lens, the system achieves variable focal length and focusing capabilities, eliminating the need for multiple discrete lenses and their associated mechanical driving mechanisms
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 solution maintains resolution and accuracy by compensating for temperature-induced changes in the liquid lens interface, reducing the need for additional power-consuming lens driving devices and minimizing the overall camera module size.
Implementation Method 1
a liquid lens unit that performs the AF function and the OIS function by electrically adjusting a curvature of a interface between two liquids
Implementation Method 2
a temperature sensor that detects a temperature of the liquid lens
Implementation Method 3
provide a heating signal to a heater for adjusting the temperature of the liquid lens
Data Source
AI summary
An embodiment of the present invention comprises: a lens assembly including a liquid lens; a temperature sensor sensing the temperature of the liquid lens; an image sensor receiving light passing through the lens assembly; a detection unit detecting a first driving signal applied to the liquid lens so as to adjust an interface of the liquid lens; and a determination unit comparing the temperature with a target temperature to provide a heating signal to a heater for adjusting the temperature of the liquid lens or to provide the temperature to a compensation unit. The compensation unit discloses a camera module generating a second driving signal which readjusts the interface of the liquid lens by compensating the temperature to the first driving signal.