KR0143676B1 - A method of adjusting parameters in a display system - Google Patents

Abstract

The present invention relates to a parameter adjusting method in a display device, comprising a D-sub connector, a microcomputer, a vertical deflection unit, a horizontal deflection unit, a high voltage unit, a preamplifier, an image output unit, and a power supply unit. Setting an adjustment width of the parameter; determining whether a parameter adjustment command is applied through the key input unit; selecting a corresponding adjustment width and a corresponding parameter according to a parameter adjustment command applied through the key input unit from the set adjustment width; And outputting the digital-to-analog converted value adjusted with the corresponding adjustment width to the vertical deflection unit, the horizontal deflection unit, the preamplifier and the image output unit, or the power supply unit. Therefore, the microcomputer has a multi-step adjustment range, so that the user can adjust the parameter from fine adjustment to the desired increase / decrease width.In the case of automatic adjustment at the factory, the parameter is adjusted initially to the maximum adjustment range and then gradually adjust the parameter to the small adjustment range. This reduces the time required for automatic adjustment.

Description

Parameter adjustment method in display device

1 is a block diagram schematically showing a color monitor to which the present invention is applied;

2 is a flowchart illustrating a parameter adjusting method according to the present invention in a display device.

* Explanation of symbols for main parts of the drawings

11: D-sub connector 12: Key input

13: Micom 14: Vertical deflection

15: horizontal deflection portion 16: high pressure portion

17: preamplifier 18: video output

19: CRT 20: power supply

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display device, and more particularly to a method for adjusting a parameter with a multi-step adjustment range.

Among the display devices, a monitor is an output device of an information processing device, and converts a binary data signal of an information processing device into a video signal using a cathode ray tube (CRT) and outputs it to a screen. There are Video Graphic Adapter (VGA) monitor, Enhanced Graphic Adapter (EGA) monitor, Color Graphic Adapter (CGA) monitor, Mono Display Adapter (MDA) monitor, etc. .

Currently, there are many types of video card of computer system which are generally used, such as CGA, MDA, EGA, EGA / CGA, PGA, VGA (3 mode), VGA 8514 (1 mode), SVGA, etc. Different video cards have different vertical and horizontal sync signals. Synchronization signal is dualized by positive and negative sync to distinguish polarity, and each card has modes of 15.7KHz, 18.5KHz, 30.5KHz, 31.5KHz, 35.5KHz, 38.5KHz and 48.5KHz. , Vertical frequency has 50Hz, 60Hz, 70Hz, 87Hz mode.

Therefore, there is a demand for a multi-mode monitor that can switch modes according to various vertical and horizontal frequencies. That is, the polarity of the vertical sync and horizontal sync signals output according to the graphics modes is different. Therefore, the multi-mode monitors that allow one monitor to operate in various graphics modes of the computer system have the same polarity as the vertical sync and horizontal sync signals. It is converted to be suitable for detecting and operating.

Most of these multi-mode monitors use a microcomputer (13 in FIG. 1). In the microcomputer 13, each parameter, for example, horizontal position (H.Position), horizontal size (H.Size), and vertical position (V.Position) is used. ), The V / Size, Pincushion, and Tilt were selected from the key input unit 12 to output digital / analog conversion values related to the parameter. For example, when the resolution of the digital-to-analog converter is 8 bits, the corresponding conversion value is output by increasing the value from 1 to 256 by ± 1.

Therefore, it is not only cumbersome but also requires a lot of time for adjustment because the factory needs to go through several steps in order to increase or decrease by 1 or to reach the value that the user wants to adjust.

Accordingly, an object of the present invention is to provide a parameter adjusting method for adjusting a parameter by increasing or decreasing the multi-step adjustment range in a microcomputer in a display device in order to solve the above problems.

In order to achieve the above object, a parameter adjusting method according to the present invention includes a D-sub connector for supplying R, G, B, horizontal / vertical synchronization signals supplied from a video card to each unit, and a vertical / horizontal supply from the video card. Micom performs re-adjustment such as horizontal / vertical synchronization, deflection optimization and deflection correction using the synchronization signal, vertical deflection unit generating vertical sawtooth current using the vertical synchronization signal, and using the horizontal synchronization signal A horizontal deflection portion for generating a horizontal sawtooth wave current and a flyback pulse, a high voltage portion for generating a high voltage using the flyback pulse, and amplifying the R, G, and B signals to a predetermined voltage level to the CRT. A display device comprising a preamplifier and a video output unit to be applied, and a power supply unit supplying a power voltage to each unit, wherein the micom Setting a width: determining whether a parameter adjustment command is applied through a key input unit: selecting a corresponding adjustment width and a corresponding parameter according to a parameter adjustment command applied through the key input unit from the set adjustment width: and the corresponding And outputting the digital / analog conversion value adjusted with the corresponding adjustment range to the vertical deflection unit, the horizontal deflection unit, the preamplifier and the image output unit, or the power supply unit.

Hereinafter, with reference to the accompanying drawings will be described in detail an embodiment of the present invention.

FIG. 1 is a block diagram showing a multi-mode monitor to which the present invention is applied. The D-sub connector 11, the key input unit 12, the microcomputer 13, the vertical deflection unit 14, and the horizontal deflection unit 15 are shown in FIG. And a high voltage unit 16, a preamplifier 17, an image output unit 18, a CRT 19, and a power supply unit 20.

2 is a flow chart for explaining a parameter adjusting method according to the present invention in the display device, the step of setting a multi-step adjustment width in the microcomputer 13 (step 21), the parameter applied through the key input unit 12 Selecting the adjustment width and the corresponding parameter according to the adjustment command (steps 22 to 24), and converting the digital / analog conversion value adjusted to the adjustment width with respect to the parameter to the vertical deflection portion 14, the horizontal deflection portion 15, And outputting the preamplifier 17 and the image output unit 18 or the power supply unit 20 (step 25).

Next, the operation of the present invention will be described with reference to FIGS. 1 and 2.

In FIG. 1, the vertical synchronization signal V-sync and the horizontal synchronization signal H-sync supplied from a predetermined video card through the D-sub connector 11 are applied to the microcomputer 13, and R, The G and B signals are applied to the preamp 17.

The microcomputer 13 uses the vertical / horizontal synchronization signal supplied from the video card to readjust the parameters such as horizontal / vertical synchronization, deflection optimization, and deflection correction within the corresponding resolution. Then, the preamplifier 17 is controlled according to a command applied through the key input unit 22, and the vertical deflection unit 14 and the vertical and horizontal synchronizing signals having a corresponding frequency within the resolution allowable in the multi-mode monitor are respectively. It is applied to the horizontal deflection section 15. The parameter adjusting method according to the present invention is performed by the microcomputer 13, which will be described with reference to FIG.

In the twenty-first step, the microcomputer 13 first sets a multi-step adjustment width, for example, ± 1, ± 2, ± 4, ± 8, and the like.

In the twenty-second step, it is determined whether the parameter adjustment command is authorized through the key input unit 12, and if not, the present flowchart ends, and if so, the process proceeds to the twenty-third step.

In steps 23 and 24, the corresponding adjustment width and the corresponding parameter are selected from among the adjustment widths set in step 21 according to the parameter adjustment command applied through the key input unit 12.

In step 25, the flow is terminated after the digital / analog conversion (DAC) value adjusted for the parameter is adjusted.

Returning to FIG. 1 again, the vertical deflection unit 14 generates a vertical deflection sawtooth current using the vertical synchronizing signal parameter output from the microcomputer 13, and the horizontal deflection unit 15 outputs the horizontal deflection sawtower. A horizontal deflection sawtooth current is generated using the synchronization signal parameter, and a flyback pulse required for high voltage generation is generated.

The high voltage unit 16 generates a high voltage with a fly-back transformer (FBT) using a flyback pulse and applies it to each grid and anode terminal of the CRT 19.

The preamplifier 17 and the video output unit 18 amplify a low voltage level video signal supplied from the D-sub connector 11 to maintain a constant voltage level. In this case, the switching amplifier may be sufficient, but in general, a monitor requires a specific range of luminance values (from black to white) to display a screen. That is, the grid or the cathode of the CRT 29 should be able to be adjusted to a predetermined maximum voltage in a cut-off state. Cathode grid drives are rarely used because of their low capacitance and simple interfacing, and most monitors use cathode drives.

The power supply unit 20 supplies the power voltages of each unit, that is, the microcomputer 13, the vertical deflection unit 14, the horizontal deflection unit 15, the high voltage unit 16, the preamplifier 17 and the video output unit 18. It is for.

As described above, in the parameter adjusting method according to the present invention in the display device, since the microcomputer has a multi-step adjusting range, the user can adjust the parameter from the fine adjustment to the desired increase and decrease. In the case of automatic adjustment at the factory, it is possible to reduce the time required for automatic adjustment by adjusting the parameter to the maximum adjustment width initially and then gradually adjusting the parameter to the small adjustment width.

Claims (1)

R, G, B from the video card, D-sub connector for supplying horizontal / vertical synchronization signals to each part, horizontal / vertical synchronization within the corresponding resolution using the vertical / horizontal synchronization signal supplied from the video card, A microcomputer that performs readjustment such as deflection optimization and deflection correction, a vertical deflection unit generating a vertical sawtooth current using the vertical synchronizing signal, and a horizontal deflection unit generating a horizontal sawtooth current and a flyback pulse using the horizontal synchronizing signal. A high voltage unit generating high voltage using the flyback pulse and applying the CRT to a predetermined voltage level, and a preamplifier and video output unit for supplying the CRT to a predetermined voltage level A display apparatus having a power supply unit for supplying a power supply, the display device comprising: setting a multi-step adjustment width in the micom: a parameter adjustment command is applied through a key input unit Determining whether the adjustment width and the corresponding parameter are adjusted according to a parameter adjustment command applied through the key input unit from the set adjustment width; and the digital / analog conversion value adjusted to the adjustment width with respect to the corresponding parameter. And outputting to a vertical deflection unit, a horizontal deflection unit, a preamplifier, an image output unit, or a power supply unit.