JPS6397994A - display device - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention relates to a display device used in a computer terminal, etc., and in particular to a display device that automatically identifies the display timing and displays accurately even when connected to various computers. Regarding improvements made to perform the following.

(Prior Art) FIG. 5 is an explanatory diagram of display timing of a display device. In the figure, one screen is composed of a large number of scanning lines, and a vertical synchronization signal 13 indicates the start of one frame, and a horizontal synchronization signal indicates the start of one scanning line.

The computer screen is ASCII, Vol. 10.
As described in 飄7°P, +76 (+986), the number of scanning lines in one screen is increased in order to display fine dots.

(Problems to be Solved by the Invention) However, since each computer has a different horizontal scanning frequency, it is necessary to use a dedicated display. This gift increases the price. There were problems such as not being able to share it with other fi[.

There are also displays that support a certain range of scanning frequencies, but since the aspect ratio, which indicates the ratio of length and breadth, varies, there is a problem that image distortion occurs, for example, when a perfect circle is displayed as an ellipse.

SUMMARY OF THE INVENTION The present invention has been made to solve these problems, and it is an object of the present invention to provide a display device that is compatible with various horizontal scanning frequencies and that accurately displays images.

(Means for Solving the Problems) The present invention achieves the above object by providing a display device that displays an image signal transmitted from a host side.
An operation for receiving a calibration signal that instructs the display aspect ratio and image center position of the image signal transmitted from the host, and calculating horizontal gain, horizontal phase, vertical gain, and vertical phase corresponding to the screen of the display. a horizontal deflection circuit that horizontally deflects the image signal based on the horizontal gain and horizontal phase calculated by the calculation unit; and a horizontal deflection circuit that horizontally deflects the image signal based on the horizontal gain and vertical phase calculated by the calculation unit The device is characterized in that it is provided with a vertical deflection circuit that vertically deflects a signal, and a cathode tube that is controlled by the horizontal and vertical deflection circuits and displays the image signal in a raster scan method.

(Function) Each component of the present invention has the following function. The arithmetic unit adjusts the horizontal gain and vertical gain to match the aspect ratio of the calibration signal, and also determines the individual values so that they can be displayed on the entire screen. Further, the arithmetic unit adjusts the horizontal phase and the vertical phase so that the image center position of the calibration signal coincides with the center of the screen. The horizontal deflection circuit and vertical deflection circuit are 4 determined by the calculation section.
The image signal is expressed by two values. Display on ii tube.

(Example) The present invention will be explained below using the drawings.

FIG. 1 is a block diagram showing an embodiment of the present invention. In the figure, 10 is a host computer, 20 is a video unit that displays the video signal output from the host computer 10, 30 is a preprocessing unit that extracts the calibration signal output from the host computer 10 from the video signal, and 40 is the preprocessing unit 30. This is a calculation unit that calculates the amount of operation required for the operation of the video unit 20 based on the extracted calibration signal.

Details of each block will be described below. Reference numeral 11 denotes an image signal generation circuit that outputs a video signal, and also generates a horizontal synchronization signal and a vertical synchronization signal. Reference numeral 12 denotes a calibration signal No. 3 generation circuit which superimposes a calibration signal containing information on the aspect ratio and image center position on the video signal and outputs the same, and superimposes a signal indicating that the calibration signal is being output on the vertical synchronization signal.

21 is a video amplification circuit that amplifies the video signal, and emits an electron beam from an electron gun. 22 is a circuit that horizontally deflects the electron beam using horizontal synchronization (No. 1), and the amplitude and phase are variable by external input.

Reference numeral 22 denotes a circuit that vertically deflects the electron beam using a vertical synchronization signal, and the amplitude and phase are variable by external input. 24 is a horizontal deflection coil, 25 is a vertical deflection coil, 26
is a cathode tube and the screen is vertical LV.

It is approximately rectangular with horizontal L and H sides.

Reference numeral 31 designates a monomulti to create a wind signal for detecting a calibration designated pulse by inputting a vertical synchronization signal, and 32 designates a first flip-flop that detects a pulse signal within the time designated by the wind signal, which connects the calibration status signal. (33 is a logic circuit that removes the pulse signal and returns it to the original vertical synchronization signal, and 34 is a horizontal pulse time T for inputting the video signal and determining the horizontal gain and horizontal phase included in the calibration signal.
HE, second flip-flop to create TL, 35
is a logic circuit that resets the flip-flop 34. 36 is a vertical pulse time T for inputting a video signal and determining the vertical gain and vertical phase included in calibration No. 43.
V,, third flip-flop to create TV2, 37
is a logic circuit that resets the flip-flop 36. 38 is a logic circuit which inputs a calibration status signal and prohibits display of the cathode tube 26 whose calibration signal is connected to the video signal.

41 is the horizontal pulse time TO, , Tl+2 and the cathode tube 26
42 is a horizontal gain unit that calculates a gain KII for performing an appropriate display on the negative 4fl tube 26 according to a length LH specific to the length LH and a horizontal scanning speed GH; Line period TI. phase to match the horizontal center position to the center of the screen? ! 8
This is a horizontal phase section that calculates the constant amount PH.

43 is a vertical pulse time TV, a vertical gain unit that calculates a gain KV from the length LV specific to TV2 and the cathode tube 26, and the horizontal scanning speed GV; 44 is a vertical pulse time T
V, , TV2 and vertical scanning period TV. This is a vertical phase section that calculates the phase adjustment amount P■ for aligning the vertical center position with the center of the screen.

The operation of the GC neck configured in this way will be explained based on FIGS. 2 and 3. FIG. 2 is an explanatory diagram of the relationship between the screen of the cathode tube 26 and vertical and horizontal synchronizing signals, and FIG. 3 is a time chart showing the phase relationship of the signals.

The calibration signal generation circuit 12 outputs the vertical synchronization signal and the calibration pulse signal ○ by m, and then outputs the two diagonal points ■ and ■ of the largest square that can be displayed by the image signal generation circuit 11 as the video signal in the logical display area. Output it so that it passes through the center ■. The preprocessing unit 30 sets the calibration status signal to )I using the calibration pulse signal ○, prohibits the display of the two diagonal points ■ and ■ on the cathode tube 26, and also sets the calibration status signal to Pulse time TI1. ．． TH2 is determined, and the vertical pulse times TV, TV2 are determined from the two diagonal points A and B and the vertical synchronization signal.

The calculation unit 40 calculates the gains Kll and KV such that the two diagonal points ■ and ■ match the two diagonal points , ■ of the largest square on the screen (LVXLll) that pass through the center ■ using the following equations. .

Kll = Lll/ ((TH+ Tll□) x
Gtl) (1) KV= LV/ ((T
V+ -TV2) X GV) (2) Phase adjustment amount pH to match the center [with] and
, PV are determined by the following formula.

PII=α・TI. /2- (Tt!I+TI+2)
/2 (3)PV= /3 ・TVo/2 (
TV+ + TV2)/2 (4) In addition, α is the effective display rate of the horizontal scanning time TH, which does not include blanking time,
β is vertical scanning time TV. This is an effective display rate that does not include flyback time, and is a characteristic specific to the operation of the video unit 20.

The video unit 20 receives the parameter K11 calculated by the calculation unit 40.
．． Calibrate using KV, PH, and PV, and display the video signal in the correct shape using the entire screen.

FIG. 4 is a block diagram showing a second embodiment of the present invention. In the first embodiment, the calibration signal was multiplied by the video signal and separated using the preprocessing section 30, but in this embodiment, the calibration signal is sent over a dedicated line and the preprocessing section 30 is unnecessary, and the configuration is simplified. Keeping it simple.

In the figure, 13 is the horizontal pulse time T it + ,
This is a calibration signal generation circuit that transmits T I+ 2 and vertical pulse times TV, , TV2 using a dedicated line, and these pulse signals include information on the asbestos ratio and the image center position.

The arithmetic unit 40 adjusts the image unit 20 using the signal sent from the calibration signal generation circuit 13 to obtain an optimal image.

In the above embodiment, two diagonal points of a square are used.

(2) is used to determine the aspect ratio and the image center position @, but a rectangular signal may be used as long as the shape is determined, or the image center position nQ may be indicated by another signal.

(Effect of the invention) As explained above, according to the present invention, there is a blowing effect.

■ Since the aspect ratio of the video signal displayed on the screen is adjusted by the calibration signal, the displayed figure has the correct shape and uses the entire screen.

- Since only one type of display device is required even when hosting multiple rice varieties, maintenance work and inventory management become easier.

[Brief explanation of the drawing]

FIG. 1 is a configuration block diagram showing one embodiment of the present invention, and FIG.
The figures are an explanatory diagram of the operation of the equipment in Fig. 1, Fig. 3 is a time chart of signals, Fig. 4 is a block diagram showing another embodiment of the present invention, and Fig. 5 is an explanatory diagram of a conventional device. . 22...Horizontal deflection circuit, 23...Vertical deflection circuit, 2
6... Cathode tube, 40... Arithmetic unit.

Claims (1)

[Scope of Claims] A display device that displays an image signal transmitted from a host side, comprising: receiving a calibration signal indicating the aspect ratio and image center position to be displayed of the image signal transmitted from the host; a calculation unit that calculates horizontal gain, horizontal phase, vertical gain, and vertical phase corresponding to the screen of the display; and a horizontal deflection unit that horizontally deflects the image signal based on the horizontal gain and horizontal phase calculated by the calculation unit. a vertical deflection circuit that vertically deflects the image signal based on the vertical gain and vertical phase calculated by the calculation section; A display device comprising a cathode for displaying images.