Computer graphics processing and selective visual display system – Display driving control circuitry
Reexamination Certificate
1999-06-30
2001-11-06
Hjerpe, Richard (Department: 2674)
Computer graphics processing and selective visual display system
Display driving control circuitry
C345S010000, C345S011000, C345S012000, C345S013000, C345S014000, C345S204000, C345S205000, C345S211000, C345S213000, C315S001000, C315S364000, C315S370000
Reexamination Certificate
active
06313831
ABSTRACT:
CROSS-REFERENCE TO RELATED APPLICATIONS
This application claims the benefit of Korean Patent Application Nos. 98-25754 filed Jun. 30, 1998, and 98-31319 filed Jul. 31, 1998 the disclosures of which are incorporated herein by reference.
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a device for synchronizing a power drive signal of a monitor and a method therefor, and more particularly, to a device for synchronizing a power drive signal of a monitor by selectively dividing a frequency of a horizontal synchronization signal and a method therefor.
2. Description of the of Related Art
A frequency division means that a signal with a divided frequency of 1/a (where “a” is positive number) of the original value of the frequency thereof is outputted from a device when the signal with the original value of the frequency is inputted into the device.
For example, when a signal of 50 KHz is inputted into a device and a frequency division of ½ is carried out, a signal of 25 KHz is outputted from the device.
FIG. 1
illustrates a control device of a conventional device for controlling a power drive synchronization signal of a monitor.
A conventional device for controlling power drive synchronization signals of a monitor comprises a micro-computer
72
filtering horizontal / vertical signals (H/V_SYNC) to discern a polarity of signal and calculating a frequency exactly to output a horizontal frequency signal (Hout) and a vertical frequency signal (Vout), a horizontal deflection circuit
74
performing a horizontal deflection function according to the horizontal frequency signal (Hout) outputted from the micro-computer
72
, a vertical deflection circuit
76
performing a vertical deflection function according to the vertical frequency signal (Vout) outputted from the micro-computer
72
, and a high voltage drive circuit
78
receiving the horizontal frequency signal from the horizontal deflection
74
to output a driving signal driving a high voltage output circuit (not illustrated).
In a monitor provided with the device for controlling the power drive synchronization signal, a power voltage provided to an inner circuit of the monitor is stabilized and a driving signal outputted from a high voltage circuit part to a flyback transformer is synchronized with a horizontal synchronization signal applied from a video card to a horizontal circuit part.
However, in a conventional device for controlling power drive synchronization signal as described above, the flyback transformer should be operated by a period of high frequency when the horizontal synchronization signal has a high frequency. Accordingly, a lot of power loss occurs due to the flyback transformer. In addition, as electronic parts for high current are required, high power voltage should be connected to the flyback transformer to support the movement of said flyback transformer, cost for such devices are increased.
SUMMARY OF THE INVENTION
Accordingly, in order to overcome such drawbacks in the conventional art, it is therefore an object of the present invention to provide a device for synchronizing a power drive signal of a monitor by dividing a frequency of a horizontal synchronization signal so as to reduce a power loss of such a product and a cost of production and simplify a method therefor.
Additional objects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
To achieve the above and other objects, in accordance with the present invention, there is provided a device for synchronizing a power drive signal of a monitor, the device comprising a central processing unit to receive a horizontal synchronization signal outputted from a video card and judge whether a frequency of the horizontal synchronization signal is larger than a frequency preset in a memory; a frequency-division circuit to receive the horizontal synchronization signal from the video card and divide the frequency of the horizontal synchronization signal; a high voltage driving circuit to generate the power drive signal; and a frequency division signal selection circuit to output the frequency-divided horizontal signal synchronization from the frequency division circuit to the high voltage driving circuit in response to the central processing unit judging that the frequency of the horizontal synchronization signal is larger than the preset frequency and outputting the horizontal synchronization signal with the frequency thereof unchanged to the high voltage drive circuit in response to the central processing unit judging that the frequency of the horizontal synchronization signal is not larger than the frequency preset in the memory.
To further achieve the above and other objects of the present invention, there is provided a method of controlling a device for synchronizing a power drive signal of a monitor, the method comprising receiving a horizontal synchronization signal from a video card and determining a frequency of the horizontal synchronization signal; judging whether the frequency of the horizontal synchronization signal is larger than a frequency preset in a memory; dividing the frequency of the horizontal synchronization signal and driving a high voltage driving circuit by the frequency-divided horizontal synchronization signal in response to the judgement that the frequency of the horizontal synchronization signal is larger than the frequency preset in the memory in the judging step.
REFERENCES:
patent: 4754330 (1988-06-01), Spieth
patent: 5189515 (1993-02-01), Chen
patent: 6094018 (2000-07-01), Fujimori et al.
patent: 6211855 (2001-04-01), Kim
Choi Chun-Geun
Youn Joo-Moon
Hjerpe Richard
Lesperance Jean
Samsung Electronics Co,. Ltd.
Staas & Halsey , LLP
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