Dynamic Frame Frequency Control for LCD Afterimage Prevention
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Solution Overview
Problem
Liquid crystal display (LCD) devices experience image sticking and noise issues due to residual afterimages when switching between different image files, particularly when high frame frequencies are used for video reproduction, leading to increased throughput and delayed processing which can result in noise on the display.
Innovation Solution
An image reproduction controlling device that dynamically adjusts the frame frequency of the image signal based on the type of image file being switched, setting appropriate frame frequencies for video and non-video files to prevent afterimages and noise, including features like contrast and bit rate adjustments to optimize throughput and reduce noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the frame frequency is set to a high frequency to discharge charges and prevent afterimage, then the afterimage is inhibited from occurring, but the throughput in the decode processor increases and may cause noise in the displayed video
Solution Approach 1:
The patent applies dynamics by making the frame frequency adjustable rather than fixed. The control unit dynamically changes the frame frequency based on the type of image being displayed: using a first frame frequency for video files and a second frame frequency for still images. This dynamic adjustment allows the system to optimize charge discharge effectiveness while preventing throughput-related noise, resolving the contradiction between afterimage prevention and noise reduction
Solution Approach 2:
The patent implements parameter changes by modifying the frame frequency parameter according to the image type. The control unit detects whether the displayed image is a video or still image and相应地 changes the frame frequency parameter to appropriate values. This parameter adaptation enables the system to achieve effective charge discharge for still images without excessive throughput that would cause noise in video display
2Stability of the object's composition
If the frame frequency is set to a high frequency to ensure charges are discharged, then the image switching is smooth without afterimage, but the decode process may be delayed and processing throughput increases
Solution Approach 1:
The system dynamically adjusts the frame frequency based on image type, using a lower first frame frequency for video files to maintain manageable decode processor throughput, and a higher second frame frequency for still images to ensure effective charge discharge. This dynamic adaptation resolves the contradiction between display stability and processor productivity
Solution Approach 2:
The control unit performs preliminary classification of the image type before setting the frame frequency. By determining whether the image is a video or still image in advance, the system can pre-select the appropriate frame frequency, ensuring both stable display and reasonable processing throughput without excessive delays
Data Source
AI summary
An image reproduction controlling device generates an image signal corresponding to an image file and supplies the image signal to a liquid crystal display device displaying a video and an image other than the video to reproduce the image file. The image reproduction controlling device includes: an image switch determining unit which determines whether the image file is switched from a first image file for the video to a second image file for the image other than the video or the image file is switched from the second image file to the first image file, when the image file being displayed is switched.