KR19990052490A - Mode search method and device of monitor - Google Patents

Abstract

The present invention relates to a mode search method and apparatus for performing mode search and mode conversion in a simplified procedure.

The present invention detects the horizontal synchronization signal and the vertical synchronization signal of the input signal to determine the resolution, and detects the frequency and polarity of the horizontal synchronization signal and the vertical synchronization signal, and the factory corresponds to the standard mode according to the detected resolution, frequency and polarity. Set the input signal to the mode and the user mode set by the user.

The method and apparatus for mode search of a monitor of the present invention can implement a stable system by performing mode search and mode conversion by a simple processing procedure in a monitor of digital processing such as an LCD.

Description

Method for Detecting Mode Of Monitor And Apparatus Thereof

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display device such as a monitor, and more particularly to a mode search method and apparatus for performing mode search and mode conversion in a simplified procedure.

Recently, video media have tended to display video signals as digital video signals that can easily compress information instead of analog video signals in order to provide high-resolution images to viewers. Accordingly, a liquid crystal display device (Liquid Crystal Display; hereinafter referred to as "LCD") that has been developed and commercially available for business or home use due to its high resolution and excellent resolution, can be thinned as a video display device displaying a video signal as a digital video signal. Development is accelerating. The mode search of the monitor display system for a personal computer (PC) is judged based on the frequency of the horizontal and vertical sync signals and the polarity of the horizontal and vertical sync signals. Will change the data. In contrast, in a digital processing monitor such as an LCD, when the mode search is determined based on the horizontal and vertical frequency and its polarity, overflow or under flow may occur due to timing data of the input mode of the previous input signal. A new problem occurs that breaks the screen for a while. In a digital processing monitor such as an LCD, since the format of the output signal, that is, the resolution, is determined, the output resolution is always constant regardless of the resolution of the input signal. Here, in the process of converting the resolution of the input signal into the output resolution, data such as phase locked loop (PLL) data should be converted. The reference for converting these data is the resolution of the input signal, that is, the number of horizontal lines included in one vertical synchronizing signal. In other words, in a digital processing monitor such as an LCD, the mode search must be processed in a manner different from the conventional analog processing, so that accurate performance can be expected.

However, when the mode search criteria of the digital processing method is limited only to the number of lines, there is a problem that there is no solution to deal with a case that is not a format defined by a standard organization such as VESA. In this case, it means that the monitor is not a multi-scan monitor but a multi-mode monitor. In order to solve this problem, the mode must be set according to different graphic environments on the same line. However, to satisfy this problem, a large amount of memory is required and the mode search time is dramatically increased. As a result, the mode search and mode conversion procedures are very complicated and the system becomes unstable.

As a result, if the number of lines is the same, but the horizontal and vertical frequencies are different, the signals must be recognized in different modes, and the data related to the corresponding timings must be changed and the basic converted data must be processed the same. And system control is required.

Accordingly, it is an object of the present invention to provide a mode search method and apparatus for implementing a stable system by performing mode search and mode conversion by a simple processing procedure in a monitor of a digital processing such as an LCD.

1 is a block diagram showing a mode search apparatus according to an embodiment of the present invention.

2 is a flowchart showing the processing procedure of the mode search method according to the embodiment of the present invention step by step.

* Explanation of symbols for main parts of the drawings

2, 10: counter buffer 4: vertical counter register

6: horizontal counter register 8: oscillator

12 control unit 14 polarity detection unit

In order to achieve the above object, the mode search method of the present invention detects the horizontal synchronization signal and the vertical synchronization signal of the input signal to determine the resolution, detecting the frequency and polarity of the horizontal synchronization signal and the vertical synchronization signal; And setting the input signal to a factory mode corresponding to the standard mode and a user mode set by the user according to the detected resolution, frequency, and polarity.

The mode search method of the present invention comprises the first step of determining the resolution by the number of horizontal synchronizing signals in one vertical synchronizing signal, and the frequency and polarity of the vertical synchronizing signal and the horizontal synchronizing signal if the resolution is the same as that of the previous input signal. And a third step of varying the timing of the current state if the frequency and polarity do not match the frequency and polarity of the vertical synchronizing signal and the horizontal synchronizing signal of the previous input signal.

The mode retrieval apparatus of the present invention is connected in common with counting means for counting the vertical synchronizing signal and the horizontal synchronizing signal, polarity detecting means for detecting the polarity of the vertical synchronizing signal and the horizontal synchronizing signal, and counting means and the detecting means. And a control means for determining the resolution of the input signal based on the signal and the horizontal synchronization signal, and for setting the factory mode corresponding to the standard mode and the user mode set by the user according to the frequency and polarity.

Other objects and advantages of the present invention in addition to the above object will be apparent from the description of the embodiments with reference to the accompanying drawings.

Hereinafter, embodiments of the present invention will be described in detail with reference to FIGS. 1 and 2.

1 shows a mode search apparatus for a monitor according to an embodiment of the present invention.

In the configuration of Fig. 1, the mode retrieval apparatus of the monitor of the present invention includes a vertical counter register 4 to which a vertical synchronization signal Vsync is supplied, a first counter buffer 2 connected in series to the vertical counter register 4, and the like. The horizontal counter register 8 to which the horizontal synchronization signal Hsync is supplied, the second counter buffer 10 connected in series to the horizontal counter register 8, the vertical counter register 4 and the horizontal counter register 8. An oscillator 6 commonly connected to the control unit, a control unit 12 commonly connected to the first and second counter buffers 2, 10 and the oscillator 6, and a vertical synchronization signal ( And a polarity detector 14 to which Vsync and the horizontal synchronization signal Hsync are commonly supplied.

The vertical counter register 4 counts the input vertical synchronizing signal Vsync by the sampling frequency supplied from the oscillator 6 and stores it in the first counter buffer 2. The horizontal counter register 8 counts the input horizontal sync signal Hsync by the sampling frequency supplied from the oscillator 6 and stores it in the second counter buffer 10. The polarity detector 14 detects the polarity of the input vertical sync signal Vsync and the horizontal sync signal Hsync and supplies the same to the controller 12. The control unit 12 receives the horizontal synchronizing signal Hsync from the second counter buffer 10, and receives the vertical synchronizing signal Vsync from the first counter buffer 2. The signal Hsync is read, and the polarity of the vertical sync signal Vsync and the horizontal sync signal Hsync is read from the polarity detector 14. The controller 14 controls the factory mode when the current input mode is the standard mode based on the detected vertical sync signal Vsync and the horizontal sync signal Hsync in one vertical sync signal Vsync, that is, the number of lines. If the number of lines is the same but the horizontal and vertical frequencies are different, set it to User Mode. To this end, the controller 14 is implemented as a microcomputer Micom.

Here, the factory mode refers to a mode in which data is set according to standard horizontal and vertical frequencies in a manufacturing stage of a manufacturer. In addition, the user mode reads the data of the non-standard mode and the same number of lines as the factory mode from the table of data already set by the experiment in the ROM area of the microcomputer. It means the mode to select according to the environment. This will be described with reference to Table 1.

TABLE 1

If there are modes shown in Table 1, case 1 is SVGA standard mode and case 2 or 3 is non-standard mode. In a digital processing monitor such as an LCD, since the number of lines is the same, the first, second, and third times are recognized in the same mode, and thus have the same default data. In contrast, the monitor mode search apparatus of the present invention is implemented as a multi-scan monitor by setting the standard mode such as No. 1 to the factory mode and the user modes for the second and third. At this time, the mode data is stored in a memory, for example, an erasable pyrom (Erasable and Programmable ROM (EPROM)) referred to by the controller 12 so that the user can set the mode data.

2 is a flowchart showing step by step the processing procedure of the mode search method of the monitor according to an embodiment of the present invention.

In the mode search, the controller 12 detects the horizontal sync signal Hsync in one vertical sync signal Vsync, that is, the number of lines, with respect to the input signal to determine the resolution (step S1) to determine whether it is the same as the previously input resolution. Done. In this case, when it is determined that the input signal is the same as the previous resolution, the frequency and the polarity of the vertical sync signal Vsync and the horizontal sync signal Hsync are determined. In step S3, when the resolution of the input signal is determined to be not the same as the previous resolution, the current state and mode data are converted into the corresponding data set in the input resolution. (Step S4) And the control unit 12 controls the frequency and polarity of the vertical sync signal (Vsync) and the horizontal sync signal (Hsync) detected in step S3 to the vertical sync signal (Vsync) and the horizontal sync signal (Hsync) of the previous input signal. The frequency and polarity of are determined to be the same. As a result, if it is determined to be the same, the timing data and the mode data of the current state are retained as it is (step 56). Will remain the same. (S7 step)

As described above, the method and apparatus for retrieving the mode of the monitor of the present invention can implement a stable system by performing mode retrieval and mode conversion by a simple processing procedure in the monitor of digital processing such as LCD.

Those skilled in the art will appreciate that various changes and modifications can be made without departing from the technical spirit of the present invention. Therefore, the technical scope of the present invention should not be limited to the contents described in the detailed description of the specification but should be defined by the claims.

Claims (9)

Detecting a horizontal synchronizing signal and a vertical synchronizing signal of an input signal to determine a resolution; detecting a frequency and a polarity of the horizontal synchronizing signal and a vertical synchronizing signal; and according to the detected resolution, the frequency and the polarity And setting the input signal in a factory mode corresponding to a standard mode and a user mode corresponding to a non-standard mode. The method of claim 1, wherein the input signal is set to the user mode when the resolution is the same as that of a previous input signal and is different from the frequency. The method of claim 1, wherein the input signal is set to the user mode when the resolution is the same as the resolution of the previous input signal and the polarity is different from the polarity of the horizontal sync signal and the vertical sync signal of the previous input signal. Mode search method characterized by. A first step of determining the resolution by the number of horizontal sync signals in one vertical sync signal; and detecting the frequency and polarity of the vertical sync signal and the horizontal sync signal if the resolution is equal to the resolution of a previous input signal. And a second step of varying the timing of the current state if the frequency and polarity do not coincide with the frequency and polarity of the vertical synchronizing signal and the horizontal synchronizing signal of the previous input signal. The method of claim 4, wherein in the second step, the timing data and mode data of a current state are changed to data corresponding to the resolution when the resolution is not the same as the resolution of a previous input signal. 5. The method of claim 4, wherein the timing and mode of the current state are maintained when the frequency and polarity coincide with the frequency and polarity of the vertical synchronizing signal and the horizontal synchronizing signal of the previous input signal in the third step. . Counting means for counting the vertical synchronizing signal and the horizontal synchronizing signal, polarity detecting means for detecting the polarity of the vertical synchronizing signal and the horizontal synchronizing signal, and commonly connected to the counting means and the detecting means and horizontally with the vertical synchronizing signal; And control means for determining the resolution of the input signal by the synchronization signal and setting the user mode corresponding to the factory mode and the non-standard mode according to the frequency and polarity. 8. The user mode of claim 7, wherein the control unit selects the input signal when the resolution is the same as the resolution of the previous input signal and the frequency is different from the frequency of the horizontal sync signal and the vertical sync signal of the previous input signal. Mode search device, characterized in that set to. 8. The user mode of claim 7, wherein the control unit selects the input signal when the resolution is the same as that of the previous input signal and the polarity is different from the polarity of the horizontal and vertical synchronization signals of the previous input signal. Mode search device, characterized in that set to.