Camera Preview Display Frame Rate Control to Prevent Frame Drop
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Solution Overview
Problem
The frequency mismatch between the display screen and the camera module in electronic devices leads to frame drop and frame skip issues during image preview and video shooting due to the display driver chip's limitations, causing images to be covered without being displayed.
Innovation Solution
A display control method that dynamically adjusts the display frame rate by increasing it to a higher first frame rate when entering a preview or video shooting scenario, utilizing a buffer queue to manage image production and consumption, and generating Vsync signals to ensure timely image display.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the display driver chip operates at its maximum capability, then the display frame rate is limited by hardware constraints, but the camera module collects images at a higher frequency causing frame images to be covered and lost
Solution Approach 1:
The patent dynamically adjusts the display frame rate based on the operational context. When a camera application is active and collecting images at a high frequency, the display frame rate is increased to match or exceed the camera's collection frequency. This dynamic adjustment ensures that all collected frame images are displayed without being covered, resolving the contradiction between hardware limitations and image completeness.
Solution Approach 2:
The patent changes the display frame rate parameter from a fixed value to a variable that can be adjusted based on system conditions. By monitoring whether a camera application is running and at what frequency it collects images, the system modifies the display frame rate parameter accordingly, ensuring it matches or exceeds the camera's collection frequency to prevent frame coverage issues.
2Reliability
If the display frame rate is increased to match the camera collection frequency, then frame drop is prevented, but power consumption increases due to higher display switching frequency
Solution Approach 1:
The display frame rate is dynamically adjusted based on whether a camera application is active. When the camera is running, the display frame rate is increased to prevent frame drop. When the camera is not running, the display frame rate is reduced to save power. This dynamic approach ensures frame display continuity only when necessary, optimizing the trade-off between reliability and power consumption.
Solution Approach 2:
The system implements feedback by monitoring the camera application's operational state and using this information to adjust the display frame rate. The display controller receives feedback about camera activity and automatically modifies the display frequency accordingly, ensuring optimal performance while minimizing unnecessary power consumption during non-camera operations.
Data Source
AI summary
A display control method may include: receiving a first operation of a user; starting a camera application in response to the first operation, and displaying a first interface on a display screen, where the first interface is a preview interface of the camera application, or the first interface is a video shooting interface of the camera application, where a display frame rate of the display screen is a first frame rate when the first interface is displayed.