Display Device Scan Line Frequency Control for Buffering Reduction
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Solution Overview
Problem
Existing display devices require significant buffering space to maintain a constant aspect ratio of input and output video images, leading to increased system costs due to the need for larger line buffers or frame buffers to avoid overflow or underflow.
Innovation Solution
A method that controls the display device by receiving an input video image, displaying background scan lines at a higher frequency on a first display area and outputting the image at a lower scan line frequency on a second area, maintaining the same aspect ratio while reducing the required buffering space.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the aspect ratio is required to be constant with full frame display scaling, then the display ratio is maintained, but a larger buffering space is required leading to increased system cost
Solution Approach 1:
The patent divides the display area into two distinct regions: a first display area for background scan lines and a second display area for the scaled video image. This segmentation allows independent control of scan line frequencies for different regions, enabling aspect ratio maintenance without requiring excessive buffering space. The background area uses a first scan line frequency while the image area uses a second scan line frequency, resolving the contradiction between aspect ratio consistency and buffering requirements.
2Ease of operation
If conventional display devices maintain the same display time for every horizontal scan line, then timing is simplified, but larger line buffers or frame buffers are required to avoid overflow or underflow
Solution Approach 1:
The patent applies different scan line frequencies to different spatial regions of the display. The first display area (background) operates at a first scan line frequency while the second display area (image) operates at a second scan line frequency. This local differentiation allows the system to avoid uniform timing constraints that would require large buffers, thereby reducing buffering space requirements while maintaining proper display timing control.
Data Source
AI summary
A method for controlling a display device is disclosed. The method includes receiving an input video image having a plurality of active scan lines, controlling the display device to display a plurality of background scan lines on a first display area with a first scan line frequency, and controlling the display device to display an output image on a second display area with a second scan line frequency. A second aspect ratio of the output image is substantially equal to a first aspect ratio of the input video image. The second scan line frequency is substantially lower than the first scan line frequency.