Computer graphics processing and selective visual display system – Display peripheral interface input device – Light pen for fluid matrix display panel
Reexamination Certificate
1998-11-23
2001-01-30
Brier, Jeffery (Department: 2779)
Computer graphics processing and selective visual display system
Display peripheral interface input device
Light pen for fluid matrix display panel
C345S087000, C345S088000, C345S182000, C345S156000
Reexamination Certificate
active
06181318
ABSTRACT:
CLAIM OF PRIORITY
This application makes reference to, incorporates the same herein, and claims all benefits accruing under 35 U.S.C§119 from an application entitled
An apparatus For Converting Resolution Of Monitor
earlier filed in the Korean Industrial Property Office on Nov. 21, 1997, and there duly assigned Ser. No. 97-61839 by that Office.
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates in general to an apparatus for converting resolution of an LCD (Liquid Crystal Display) monitor, and more particularly to an apparatus for converting resolution of an LCD such that when a resolution of an image provided from an LCD monitor is low, it is converted according to a resolution of the LCD monitor by using a DCT (Discrete Cosine Transform) and an IDCT (Inverse Discrete Cosine Transform).
2. Description of the Prior Art
Generally, a LCD monitor has advantages in that it is light and can be made thin and an image is displayed usually clearly without distortion, so that its application is being extended for coverage including lap-top computers. Accordingly, it is necessary to convert the resolution of an image output from a computer the a resolution of the LCD monitor. When converting the resolution to that of the LCD monitor, a level of a color signal of predetermined R, G and B image signals provided from the computer to be displayed on a screen of the LCD monitor are amplified, brightness adjusted and converted to a digital signal. Then a microcomputer in the LCD monitor detects the operating mode of the computer by detecting the frequency of a horizontal synchronous signal and a vertical synchronous signal in order to recognize the image resolution. The resolution is recognizable because the frequencies between the horizontal synchronous signal and the vertical synchronous signal provided from various computers are different from each other according to the display graphics mode of the computer.
The computer may output the horizontal synchronous signal and the vertical synchronous signal in several ways that include separating to output the horizontal synchronous signal and the vertical synchronous signal; outputting a composite synchronous signals by mixing the horizontal synchronous signal and the vertical synchronous signal; or mixing and outputting the horizontal synchronous signal, vertical synchronous signal and R, G or B color signals.
The display graphics modes include: CGA (Color Graphics Adapter) mode; VGA (Video Graphics OuTay) mode; and SVGA (Super Video Graphics Array) mode. The frequency and resolution of the horizontal synchronous signal and the vertical synchronous signal are different for each of these modes. For example, in the CGA mode, a frequency of the horizontal synchronous signal is 15.75 KHz while that of vertical synchronous signal is 60 Hz and a resolution is 640×350. In the VGA mode, a frequency of the horizontal synchronous signal is 31.5 KHz while that of the vertical synchronous signal is 60 Hz or 70 Hz, and its resolution is 720×350 or 640×480. In the SVGA mode, a frequency of the horizontal synchronous signal is 35-37 KHz while that of the vertical synchronous signal V is interlaced, and its resolution is 800×600.
As described above, when the microcomputer recognizes the resolution according to the display graphics mode, the separated horizontal synchronous signal and the vertical synchronous signal are output to a graphic controller in the monitor. The graphic controller varies divided values of a PLL (Phase Locked Loop) circuit according to the resolution recognized by the microcomputer, and adjusts a frequency of a pulse signal applied to an LCD panel so as to control the display. The LCD panel may provide a resolution of 1024×768. Thus, when an image with a resolution of 640×480 or 800×600 is applied, the graphic controller applies an artificial signal satisfying the resolution of 1024×768 to convert the image signal resolution to the resolution of 1024×768 and then outputs it to the LCD panel to be displayed. Namely, when an image with resolution of 640×480 is applied to an LCD panel with resolution of 1024×768, an actual picture through the LCD panel is converted to the resolution of 1024×768 through a resolution adjusting unit. In order to display the input image, additional pixels are inserted by the resolution adjusting unit, which has bad influence on the picture quality to be actually displayed. Therefore, in the conventional apparatus for converting resolution in a LCD monitor, when an image with a resolution of 640×480 or 800×600 is applied, this applied signal is converted to resolution of 1024×768 by simply fitting the size of the image to the LCD panel, thus the picture to be displayed is not clear.
SUMMARY OF THE INVENTION
An object of the present invention is to provide an apparatus for converting the resolution of an image input to an LCD monitor to the resolution of the LCD monitor such that the frequency of the input image is discrete-cosine transformed and reversely converted to convert it to the resolution provided by the LCD monitor so as to be clearly displayed on a LCD panel.
In order to attain the above object, there is provided an apparatus for converting resolution of an LCD monitor including a computer for outputting R, G and B color signals to be displayed on a screen of an LCD monitor and simultaneously outputting horizontal and a vertical synchronous signals; a signal amplifying and adjusting unit for amplifying a level of the image signal input from the computer; a clamp for adjusting a brightness of the image signal provided from the signal amplifying and adjusting unit by varying its level in accordance with a brightness control signal; an analog-to-digital converter for converting an analog signal provided from the clamp to a digital signal to output it; a microcomputer for detecting a synchronous signal provided from the computer to separate the horizontal and vertical synchronous signals, detecting a graphic display mode by using frequencies of the separated horizontal and vertical synchronous signals, and recognizing a resolution in accordance with the detected graphic display mode; and a graphic controller for discrete-cosine transforming and inverse discrete-cosine transforming the frequency of the image signal output from the analog-to-digital converter and applying it to the LCD panel in order to convert the resolution recognized by the microcomputer to a resolution suitable to a monitor of the LCD.
Additionally, there is provided a method for converting the resolution of an image input to an LCD monitor from a computer outputting R, G and B color signals to be displayed on a screen of the LCD monitor and simultaneously outputting horizontal and a vertical synchronous signals having the steps of: amplifying a level of the image signal input from the computer; adjusting a brightness of the amplified image signal by varying its level in accordance with a brightness control signal; converting brightness adjusted signal to a digital signal to output it to a microcomputer; detecting a synchronous signal provided from the computer and separating the horizontal and vertical synchronous signals; detecting a graphic display mode by using frequencies of the separated horizontal and vertical synchronous signals; recognizing a resolution of the image signal in accordance with the detected graphic display mode; discrete-cosine transforming and inverse discrete-cosine transforming the frequency of the digital image signal and applying it to the LCD panel in order to convert the resolution recognized by the microcomputer to a resolution suitable for the monitor of the LCD.
Additional advantages, objects and other features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The object and advantages of the invent
Brier Jeffery
Bushnell , Esq. Robert E.
Hauan Thu-Thao
Samsung Electronics Co,. Ltd.
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