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LCD controller to hold a fixed image aspect ratio

a technology of lcd controller and aspect ratio, which is applied in the field of keeping to achieve the effect of maintaining the aspect ratio of images

Inactive Publication Date: 2007-12-13
ETRON TECH INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This approach effectively maintains the aspect ratio of images, preventing distortion during scaling by adding necessary lines in the vertical direction, ensuring that the aspect ratio of the display panel matches that of the source image, resulting in undistorted images.

Problems solved by technology

The problem encountered in the prior art is the requirement to keep the aspect ratios the same during the transition from image source to the display panel.

Method used

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  • LCD controller to hold a fixed image aspect ratio
  • LCD controller to hold a fixed image aspect ratio
  • LCD controller to hold a fixed image aspect ratio

Examples

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Embodiment Construction

[0025]FIG. 2a illustrates pictorially a resulting image when using the method and circuit of this invention. The circular source image 210 has a 1024×768 pixel format. This translates into a 4 / 3=1.33 aspect ratio. Before the magnification or up-scaling 230 mathematical mapping takes place, the number of active lines in the vertical direction of the LCD display panel have been increased, as indicated by area 222.

[0026]FIG. 2a shows the end result of up-scaling or magnification 220. The display panel displays an enlarged circle without elliptical distortion. The resultant display on the LCD contains 1280×1024 pixels. The aspect ratio of 1280×1024 (1280 / 1024=1.25) matches the aspect ratio of the source image (1024 / 820=1.25). This is the global view of this process. Next, the intermediate steps will be reviewed. FIG. 2b shows more detailed steps of this main embodiment of this invention. The source image 240 is again shown with a 1024×768 (1024 / 768=4 / 3=1.33) format. The first transitio...

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Abstract

A circuit and a method for maintaining the aspect ratio of images when there is a difference in format between image sources and display panels is provided. Lines are added in the vertical direction both at the top and at the bottom of the display panel in order to make the display panel have the same aspect ratio as the input image. A line enable signal is used to expand the vertical lines to maintain aspect ratio. Previously, the period of line enable signals could not be programmed to vary sufficiently to yield the necessary expansion to allow the aspect ratio of the display panel image to match the aspect ratio of the source image. This design allows the period of the line enable signal to vary enough to match all reasonable aspect ratios of input images.

Description

[0001] This is a Divisional application of U.S. patent application Ser. No. 10 / 428,892, filed on May 2, 2003, which is herein incorporated by reference in its entirety, and assigned to a common assignee.BACKGROUND OF THE INVENTION [0002] 1. Field of the Invention [0003] The present invention generally relates to the general problem of keeping the aspect ratio of images when there is a difference in format between image sources and display panels. More particularly, this invention relates to a circuit and a method for holding a fixed aspect ratio when converting image formats to specific display formats. [0004] 2. Description of the Prior Art [0005]FIG. 1a shows a prior art illustration of what happens when a circular source image for a computer display 110 of a given resolution is up-scaled or magnified 150, to a larger format 120. The up-scaled image on the display is distorted. It no longer looks like a circle, but it now looks like an ellipse 120. The original source image was st...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): G09G5/373G09G3/20G09G3/36G09G5/00G09G5/02
CPCG09G3/3611G09G5/005G09G2340/0442G09G2340/0407G09G5/006
Inventor WANG, MING-HUNG
Owner ETRON TECH INC