Camera Module Optical Filter for AC Light Flicker Elimination
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Solution Overview
Problem
When the light intensity of an AC light source is too strong, existing methods cannot adjust the exposure time of a camera to be greater than or equal to the half-flicker cycle, leading to water ripples in preview screens that cannot be eliminated.
Innovation Solution
A camera module with an optical filter assembly where the optical filter is positioned to reduce light intensity by switching between filtered and unfiltered states, allowing adjustment of exposure time by altering the number of pixel rows exposed, ensuring the exposure time is an integer multiple of the half-flicker period.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the exposure time is increased to eliminate water ripples by adjusting the number of pixel rows refreshed, then the light intake increases, but when the AC light source intensity is too strong, the exposure time cannot be extended beyond a certain limit, making it impossible to eliminate water ripples
Solution Approach 1:
The patent introduces an optical filter that can dynamically adjust its light transmission parameter (from transparent to light-blocking state) to change the effective light intake of the camera. This allows the exposure time to be extended to eliminate water ripples while compensating for the increased light intensity through filter attenuation, thus resolving the contradiction between eliminating water ripples and controlling light intake under strong AC light conditions
Solution Approach 2:
The optical filter acts as an intermediary element between the AC light source and the camera sensor. It mediates the light transmission by switching between transparent and light-blocking states, enabling precise control of light intake to achieve both water ripple elimination and proper exposure under strong lighting conditions
2Duration of action of moving object
If the number of pixel rows refreshed is increased to extend exposure time, then water ripples can be eliminated under normal lighting, but under strong AC light the maximum exposure range is insufficient, making the method ineffective
Solution Approach 1:
The optical filter dynamically changes its light transmission parameter to compensate for the insufficient exposure time extension. By switching from transparent to light-blocking state, it effectively reduces light intake, allowing the camera to achieve both extended exposure duration for water ripple elimination and proper exposure control to prevent overexposure under strong AC light conditions
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 effectively reduces light intensity entering the camera, preventing water ripples in preview screens and improving the shooting experience by ensuring consistent light exposure even under high AC light source conditions.
Implementation Method 1
the optical filter is configured for reducing an intensity of light entering the photosensitive element
Data Source
AI summary
The disclosure relates to a camera module, a control method and apparatus, an electronic device and a storage medium. The camera module includes a camera, the camera includes a lens and a photosensitive element, and the camera module further includes an optical filter assembly. An optical filter in the optical filter assembly and the lens are parallel and located on different planes, and when the optical filter is in a filtered state, the optical filter is located on one side of the photosensitive element facing the lens for reducing an intensity of light entering the photosensitive element.