Image Display Device Scanning Direction Rotation Oblique Line Suppression
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
When rotating the scanning line direction of a moving image in image memory, an oblique line appears on the display screen due to the difference between the scanning directions during data writing and reading, particularly noticeable in high-response-speed displays like organic EL displays.
Innovation Solution
An image display device with a storage portion having first to third memory areas, where image data for alternating frames are written and read in specific directions to change the scanning line direction, ensuring that the oblique line is suppressed without increasing storage capacity, and the frames are written and read in a manner that minimizes memory requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the scanning line direction is changed in image memory to rotate the moving image, then the display orientation is improved, but an oblique line appears on the display screen due to the difference between writing and reading scanning directions
Solution Approach 1:
The image memory is divided into first and second memory areas. Image data for odd-numbered frames is written to and read from the first memory area, while image data for even-numbered frames is written to and read from the second memory area. This segmentation allows independent scanning direction control for each memory area, enabling the writing scanning direction to differ from the reading scanning direction without causing oblique line artifacts.
Solution Approach 2:
The patent inverts the conventional approach by making the writing scanning direction different from the reading scanning direction. Specifically, image data is written in a first scanning line direction and read in a second scanning line direction that is rotated relative to the first direction. This inversion of the typical same-direction approach eliminates the oblique line problem while achieving image rotation.
2Object-affected harmful factors
If separate memory areas are provided for different scanning directions to suppress oblique lines, then image quality is improved, but storage capacity requirements increase
Solution Approach 1:
The patent employs periodic switching between two scanning line directions corresponding to odd-numbered and even-numbered frames. By alternating the memory area used for each frame type and periodically switching the scanning direction, the system achieves oblique line suppression using only two memory areas instead of requiring separate areas for every possible scanning direction, thus minimizing storage capacity requirements.
Data Source
AI summary
The present invention suppresses a phenomenon in which an oblique line appears on a display screen when the scanning line direction of a moving image is changed in an image memory. To accomplish the above-mentioned object, an image display device includes: a storage portion configured to store image data for a first frame constituting the moving image and for a second frame subsequent to the first frame, and having first to third memory areas; a writing portion configured to write the image data for the first frame into the first and second memory areas and to write the image data for the second frame into the first and third memory areas; a reading portion configured to read the image data for the first frame from the first and second memory areas and to read the image data for the second frame from the first and third memory areas, the reading portion changing a scanning line direction for the image data for the first and second frames to be read to a second scanning line direction different from a first scanning line direction that is a scanning line direction for the image data prior to the writing; and a display portion configured to output the image data for the read first and second frames in time sequence in a visible manner.