Computer graphics processing and selective visual display system – Plural physical display element control system – Display elements arranged in matrix
Reexamination Certificate
1998-12-16
2001-05-01
Shalwala, Bipin (Department: 2678)
Computer graphics processing and selective visual display system
Plural physical display element control system
Display elements arranged in matrix
C345S204000, C345S504000, C345S502000
Reexamination Certificate
active
06225970
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a liquid crystal display (LCD) system, and more particularly to a system for driving a high-resolution LCD and a method thereof.
2. Description of the Conventional Art
Generally, a LCD driving system converts an analog video signal into a digital signal by applying video signals and synchronous signals, and by expanding, reducing or interpolating the digital signal, outputs the digital signal to a LCD monitor (such as a flat panel display). As demand for the LCD monitor increases, consumers also require a LCD monitor with higher resolution. Accordingly, efforts have been made for developing a novel video processor capable of realizing the high-resolution LCD monitor. A conventional LCD driving system is configured as shown in FIG.
1
.
As shown in
FIG. 1
, the conventional LCD driving system is provided with an A/D converter
10
receiving analog video signals R, G, B and horizontal and vertical synchronous signals H, V and sampling the analog video signals R, G, B to thereby converting the analog video signals into digital signals, a phase locked loop (PLL)
14
receiving the horizontal and vertical synchronous signals H, V and outputting a signal having a predetermined frequency, a controlling unit
15
outputting a control signal so that the inputted video signals are outputted in accordance with the specification of a LCD panel
13
which has been previously set, a video processor
11
expanding, reducing or interpolating the digital signals in accordance with the control signal from the controlling unit
15
and a panel driver
12
driving the LCD
13
and receiving and outputting the signal processed in the video processor
11
.
However, when applying a high-resolution input signal to a low-resolution LCD monitor, a high-frequency clock signal should be supplied to the A/D converter, video processor and panel driver. Therefore, it is difficult to select the elements fitted to such high-frequency clock signal for the conventional LCD driving system.
SUMMARY OF THE INVENTION
Accordingly, the present invention is directed to a system for driving a high-resolution LCD and a method thereof which obviate the problems and disadvantages in the conventional art.
An object of the present invention is to provide a system for driving a high-resolution LCD and a method thereof capable of achieving high resolution.
To achieve this object and other advantages and in accordance with the purpose of the present invention, as embodied and broadly described, according to a first embodiment, a system for driving a high-resolution LCD samples and thus divides inputted analog video signals into odd-numbered and even-numbered digital signals by using a pair of A/D converters which receive a clock signal at a predetermined frequency which is supplied from a PLL which receives horizontal and vertical synchronous signals of the inputted analog video signal. Here, the system divides the odd-numbered digital signals outputted from one of the A/D converters into odd-numbered digital signals of a left part of the LCD panel and odd-numbered digital signals of a right part thereof and stores the odd-numbered digital signals of the left and right parts thereof in first and third memory units, respectively, and also divides the even-numbered digital signals outputted from the other A/D converter into even-numbered digital signals of the left part of the LCD panel and even-numbered digital signals of the right part thereof and stores the even-numbered digital signals of the left and right parts thereof in second and fourth memory units, respectively, in accordance with a write/read signal outputted from a controller unit outputting control signals so as for the video signals to be outputted in accordance with a previously set specification of a LCD panel. Here, a first video processor receives and expands, reduces or interpolates the odd and even-numbered digital signals of the left part of the LCD panel and outputs the processed signals in accordance with the control signals from the controller unit, and a second video processor receives and expands, reduces or interpolates the odd and even-numbered digital signals of the right part thereof and outputs the processed signals in accordance with the control signals from the controller unit. Then, in accordance with the write/read signal from the controller unit, the system stores the odd-numbered and even-numbered digital signals of the left part of the LCD panel supplied from the first video processor in fifth and sixth memory units, respectively, while the system stores the odd-numbered and even-numbered digital signals of the right part thereof supplied from the second video processor in seventh and eighth memory units, respectively. Next, in accordance with the control signals from the controlling unit, the system continuously outputs the processed odd and even-numbered digital signals of the left part of the LCD panel and the processed odd and even-numbered digital signals of the right part thereof to a panel driver, for thereby driving the LCD panel.
According to a second embodiment of the present invention, a system for driving a high-resolution LCD is configured by including, further to the first embodiment, a first multiplexer which processes and outputs the processed odd-numbered digital signals of the left and right parts of the LCD panel outputted from the fifth and seventh memory units to the panel driver and a second multiplexer which receives and outputs the processed even-numbered digital signals of the left and right parts thereof outputted from the sixth and eighth memory units to the panel driver, the first and second multiplexers receiving a clock signal at a predetermined frequency supplied from the PLL as a referential frequency.
Further, according to a third embodiment of the present invention, there is provided a method for driving a high-resolution LCD which includes the steps of: sampling inputted analog video signals and thereby converting and dividing the inputted analog video signals into odd-numbered and even-numbered digital signals, the digital signals having half the frequency of the inputted analog video signals: storing the digital signals by dividing them into digital signals of left and right parts, respectively, of a LCD panel in accordance with a predetermined control signal: expanding, reducing or interpolating the odd and even-numbered digital signals of the left part and right part, respectively, of the LCD panel in accordance with the predetermined control signal; storing the thusly processed digital signals in accordance with the predetermined control signal; and multiplexing the processed signal to a panel driver to drive the LCD panel by reading the processed signals at twice the frequency of the previous storing step.
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Song Keun Bok
Won Jong Hwa
Fleshner & Kim LLP
LG Electronics Inc.
Osorio Ricardo
Shalwala Bipin
LandOfFree
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