JP2000047648A - Automatic display position adjustment system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an automatic display position adjustment system which needs no individual information files in a main body screen output device. SOLUTION: When a main body screen output device receives a request signal from a screen display device (105), data including the resolution of the outputs, a horizontal scanning frequency, a vertical scanning frequency and a dot clock are transmitted to a screen display device (106). The screen display device side confirms whether the data transmitted are well within the display capability range of the screen display device itself or not (107), computes a front porch, a back porch and a synchronization pulse width (108), and transmits the data above to the main body screen output device (110). The main body screen output device generates a display timing, a horizontal synchronization signal, a vertical synchronization signal and video signals based on the computed data (111), transmits the above signals to the screen display device and a screen display is started (112).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic display position adjusting method, and more particularly, to displaying an image of a video signal output from a screen output device of a main body on a screen display device such as a cathode ray tube (CRT) and changing the display position. The present invention relates to an automatic display position adjustment method for adjusting.

[0002]

2. Description of the Related Art In a conventional screen display in which a video signal output from a main body screen output device is displayed on a screen display device such as a cathode ray tube (CRT), a specified resolution and display timing are controlled only by the main body screen output device. Since it has been determined, the screen display device has to create the data in accordance with the specified resolution and display timing or prepare the information data as a file in the main body screen output device in advance.

[0003] For example, currently used standards include VESA (Video Electronics Standards Association).
)) published by a standards organization called “Displa”
There is a standard called “yData Channel”. In this standard, the main body screen output device acquires the ID number of the display screen display device, loads an information file corresponding to the ID number, and starts displaying.

Conventionally, a correction for correcting a horizontal display position of a screen in accordance with a horizontal scanning frequency of a video signal input from a personal computer which is a screen output side and a relative position of the video signal period with respect to the horizontal scanning period. A storage unit storing data is provided in a display device corresponding to the main body screen output device, the horizontal scanning frequency is counted from the video signal input, and the relative position of the video signal period with respect to the horizontal scanning period is obtained from the storage unit. An automatic display position adjustment method capable of automatically adjusting the display position of the screen by reading the horizontal position correction data and correcting the phase of the horizontal oscillation frequency is also conventionally known (Japanese Patent Laid-Open No. Hei 8-26).
No. 3032).

[0005]

However, the standard "Display Data Channel" does not guarantee a normal screen display when an information file cannot be loaded from the main body. Moreover, in the current GUI (Graphical User Interface) environment,
It is difficult to install the information file into the main body in an environment where a screen display cannot be obtained, and in the case of a user who has no knowledge of the apparatus, this situation often cannot be solved.

In the conventional automatic display position adjustment method, it is assumed that the correction data stored in the storage unit corresponding to the information file is used, so that the correction data not stored in the storage unit is used. When a video signal of specifications that require is input, normal display position adjustment cannot be performed, and preparing correction data to be able to correct video signals of all types requires a huge amount of correction data. An expensive large-capacity storage unit is required, which is actually difficult.

[0007] The present invention has been made in view of the above points,
It is an object of the present invention to provide an automatic display position adjustment method that does not require individual information files to be held in a main body screen output device.

It is another object of the present invention to provide an automatic display position adjusting method capable of automatically determining the connected screen display device and adjusting the display position of the display screen.

[0009]

According to the present invention, there is provided an automatic display position adjusting device for displaying a video signal output from a main body screen output device on a screen display device and adjusting the display position thereof. In the method, the main body screen output device and the screen display device mutually communicate respective status data, so that the main body screen output device calculates the display timing of the screen display device, and the calculated screen timing is calculated based on the calculated display timing. A video signal is output to a display device.

According to the present invention, the main body screen output device calculates display timing of the screen display device based on data obtained by communication between the main body screen output device and the screen display device,
Since the video signal is output to the screen display device at the calculated display timing, there is no need to have a separate information data file on the main body screen output device side.
Also, there is no need to use information from outside.

Further, the main body screen output device according to the present invention includes a first transmission means for transmitting a screen resolution and a refresh rate value of a video signal to be output to the screen display device, and a calculation data transmitted from the screen display device. Output means for calculating a display timing based on the calculated display timing, and outputting a video signal to the screen display device at the calculated display timing. Calculating means for receiving the value of the rate, calculating a front porch, a back porch and a synchronization pulse width of each of the horizontal and vertical synchronization signals based on them, and transmitting the calculated data to the main body screen output device; And display means for displaying a video signal at the specified display timing. According to the present invention, after the screen resolution is set, the display timing is calculated by the main body screen output device, and the video signal is displayed on the screen display device at the calculated display timing.

Further, the main body screen output device according to the present invention transmits a reset signal to the screen display device when the power is turned on or when the display resolution is changed, and then confirms that a request signal has been input from the screen display device within a predetermined time. When you do
When the status data is transmitted and the request signal is not input within a certain period of time, if the reset signal transmission and the request signal input confirmation are repeated a predetermined number of times and the request signal is not input, the resolution is set to the screen display device. It is something to be specified.

According to the present invention, the screen output device of the present invention, when the request signal is not input from the screen display device even when the reset signal is repeatedly transmitted to the screen display device a predetermined number of times when the power is turned on or when the display resolution is changed, is displayed. It is determined that data transfer is not performed correctly due to the occurrence of a malfunction of the display device or the like, and the resolution is set to the basic screen.

Further, the screen display device according to the present invention determines whether the status data received from the main body screen output device is data within the display capability range, and only when the status data is within the display capability range, does its own data. The status data is transmitted to the screen output device of the main body, and when the data exceeds the display capability range, the received video signal is displayed at the specified resolution.

[0015]

Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows a flowchart of an embodiment of the method of the present invention. In this embodiment, the screen output timing is generated by the screen output side and the screen display device mutually confirming the status of the screen display output timing.

More specifically, at the output timing of the synchronization signal and the video signal for screen display shown in FIG. 2 which are currently generally used, usually, they are fixed values specified by the screen output side. Among the output timings, the main unit screen output device determines and transmits the screen resolution and display frequency,
The display position is adjusted by the screen display device generating and returning a timing suitable for the screen display device itself.

FIG. 2A shows the synchronization width b with the period h.
, And the blank time f, which is the period of the sum of the front porch a, the synchronization width b, and the back porch c, is at a high level, and the active video is the period of the sum of the period twice as long as the margin d and the address time e. A pulse whose period g is at a low level is shown.

In FIG. 2B, one line of bright spots (raster scan) is scanned from the left to the right on the display screen 10 in the above-described cycle h (horizontal scanning period), and the blank time f is set. Returning the luminescent spot to the left end of the screen one line below the display screen 10 is sequentially repeated for the number of lines required to the lower right,
A known raster scan method in which display is performed on the display screen 10 during an active video period g is shown.

In the first stage of the embodiment shown in FIG. 1, the resolution and the refresh rate are passed to the screen display device as screen information output from the main body screen output device. In the second stage, the horizontal and vertical front porch a, back porch c, synchronization pulse width b, dot clock, and margin d are calculated based on the information received by the screen display device. In the third stage, the screen output side generates display timing based on the numerical value calculated by the screen display device. Also, apart from this,
The basic screen is defined, and data is not exchanged between the main body screen output device and the screen display device.
A screen to be used temporarily when the calculated value becomes invalid.

Next, the flow chart of the embodiment of the system of the present invention shown in FIG. 1 will be described. When the power of the main body such as a personal computer is turned on (step 10
1) Alternatively, when the operating system or application software changes the screen resolution (step 102), the main screen output device transmits the reset signal after saving the current display timing (step 103) (step 104). . The screen display device (display monitor, LCD panel, etc.) receives the reset signal, enters the standby mode for changing the resolution, and inputs the resolution, horizontal scanning frequency, vertical scanning frequency, and dot clock data from the main screen output device. And enters a mode in which a request signal can be transmitted to the main body screen output device.

Upon receiving the request signal from the screen display device (step 105), the main body screen output device transmits data of resolution, horizontal scanning frequency, vertical scanning frequency, and dot clock to be output to the screen display device (step 105). 106). The screen display device checks whether the data sent from the main body screen output device is data within the display capability range of the screen display device itself (step 107). Then, the front porch (a in FIG. 2), the back porch (c in FIG. 2), and the synchronization pulse width (b in FIG. 2) which are parameters of the screen display device itself are calculated (step 108).

For example, the above data sent from the main body screen output device indicates that the display resolution is horizontal X dots, vertical Y lines, horizontal scanning frequency H (Hz), vertical scanning frequency V (H
2), the dot clock D (Hz) indicates that the horizontal synchronization signal is calculated with the period h as 1 / H and the address time e as X / D in FIG. (A in FIG. 2), the back porch (b in FIG. 2), and the synchronization pulse width (c in FIG. 2) are calculated as a function of the number X of horizontal dots of the resolution. That is, the front porch, the back porch, and the synchronization pulse width are parameters depending on the screen display device, and change according to the number of horizontal dots of the resolution.

Subsequently, the screen display device transmits a request signal to the main body screen output device (step 109), and transmits the data calculated in step 108 to the main body screen output device (step 110). The main body screen output device performs the processing shown in FIG.
(Step 11)
1). For example, f = a + b + c g = h−f = (1 / H) −a−b−c d = (g−e) / 2 = ｛(1 / H) −a−b−c− (X
/ D)｝ / 2 The blank time f, the active video period g, and the margin d are calculated by the following equation. Then, a horizontal synchronizing signal, a vertical synchronizing signal, and a video signal corresponding to the display timing are generated and transmitted to the screen display device to start the screen display (step 112).

When the request signal is not received from the screen display device in step 105, the main screen output device increments the counter by one (step 1).
13), the counter number after the increment is a predetermined value A
In the following cases, after saving the current display timing (step 103), the reset signal is transmitted again (step 104). In this way, if the request signal cannot be received even if the reset signal is sent out the predetermined value A times, it is determined that data transfer is not performed correctly. When the resolution is changed, the stored resolution before the change is specified (step 115), and the screen display is started (step 112).

If the data received by the screen display device in step 107 is out of the performance range of the screen display device, a basic screen is specified as the display resolution immediately after power-on, and the resolution is changed. Designates the stored resolution before change (step 115), and starts screen display (step 112).

As described above, in this embodiment, since there is no need to have a separate information data file in the main body screen output device, there is no possibility that a display failure due to the absence of the information data file may occur, and a normal screen is always displayed. You can get the display. Further, it is possible to display the display image at the correct display position on the screen display device without automatically discriminating the connected screen display device or performing manual setting. Furthermore, in this embodiment, since the display timing is specified after the resolution is set, the display screen can be set in dot units.

Next, another embodiment of the present invention will be described. FIG. 4 shows a block diagram of another embodiment of the present invention. In FIG. 1, a main body 11 on the screen output side and a display device 15 of a screen display device are connected by a mini D-sub 15-pin analog RGB connector currently used in a general personal computer. The above connectors include an analog red (Red) signal and a green (Gre
en) and three pins for three primary color signals of a blue signal, three pins for a horizontal synchronization signal (Hsync), a vertical synchronization signal (Vsync), and a reset signal;
4-bit data bus connector, clock, power supply, request signal and read / write
Each signal pin is provided.

The operation of this embodiment will be described. When the reset signal transmitted from the main body 11 is received by the display device 15, the display device 15 transmits a request signal and enters the main body 11 in the standby mode. Let them know. The main body 11 sets the read / write signal to the write mode, and transmits the resolution, the horizontal scanning frequency, the vertical scanning frequency, and the dot clock through the data bus 17 in synchronization with the clock.

After transmission, the main body 11 sets the read / write signal to the read mode, and waits for input of data calculated by the display device 15. The display device 15 sends a request signal again, and sends data of the calculated front porch, back porch, and synchronization pulse width to the main body 11 through the data bus 17. The main body 11 generates a display timing based on this data, and transmits a display signal to the display device 15 through the RGB analog signal pins and the horizontal synchronization signal and the vertical synchronization signal pins (that is, the RGB three primary color signals and the horizontal synchronization signal). A display signal including a signal and a vertical synchronization signal is transmitted), and the display device 15 displays the signal.

As described above, in this embodiment, since the main body 11 transmits the display signal at the display timing notified from the display device 15, the main body 11 does not need to have a separate information data file. 1
The display image from 1 can always be displayed on the display device 15 at a normal screen position.

[0031]

As described above, according to the present invention,
The main body screen output device calculates the display timing of the screen display device based on the data obtained by communication between the main body screen output device and the screen display device, and transmits the video signal to the screen display device at the calculated display timing. By outputting, there is no need to have a separate information data file on the screen output device side, so that the possibility of display failure due to the absence of the information data file can be eliminated. A display image at an appropriate display position can always be obtained regardless of the type.

Further, according to the present invention, since it is not necessary to use information from outside, in the process of determining the screen output, the screen is completely closed between the main body screen output device and the screen display device on the signal receiving side. Therefore, there is no need to output information of the screen display device to the outside, and it is possible to output a video signal to be displayed without automatically determining the connected screen display device or performing manual setting.

Further, according to the present invention, unlike the current system which only supports the determined screen resolution, the display timing is specified after the screen resolution is set, so that the display position of the display screen is displayed in dot units. Can be adjusted.

Further, according to the present invention, even if the main body screen output device repeatedly transmits the reset signal to the screen display device a predetermined number of times when the power is turned on or the display resolution is changed, the request signal is not input from the screen display device. In some cases, it is determined that the data transfer is not performed correctly due to a problem with the screen display device, etc., and the resolution of the basic screen is set, so even if the data transfer is not performed correctly, A display image can be obtained at an appropriate display position.

[Brief description of the drawings]

FIG. 1 is a flowchart of an embodiment of the present invention.

FIG. 2 is an explanatory diagram of a synchronization signal, data, and a display screen.

FIG. 3 is a waveform diagram of a synchronization signal whose synchronization pulse width and the like are calculated according to the present invention.

FIG. 4 is a block diagram of another embodiment of the present invention.

[Explanation of symbols]

 Reference Signs List 11 main unit (main-unit-side screen output device) 12 display device (screen display device) 17 data bus 101 to 115 processing step a freon and porch b sync pulse width c back porch d margin e address time f blank time g active video period h period

Claims (6)

[Claims] 1. An automatic display position adjustment method for displaying an image of a video signal output from a main body screen output device on a screen display device and adjusting a display position of the video signal. The main body screen output device calculates display timing of the screen display device, and outputs a video signal to the screen display device at the calculated display timing by communicating respective status data with each other. A feature of automatic display position adjustment. 2. The screen output device according to claim 1, wherein the screen output device includes a first transmission unit configured to transmit a value of a screen resolution and a refresh rate of a video signal to be output to the screen display device, and to calculate data transmitted from the screen display device. Output means for calculating the display timing based on the display timing, and outputting a video signal to the screen display device at the calculated display timing, wherein the screen display device transmits the screen transmitted by the first transmission means. Calculation means for receiving the values of the resolution and the refresh rate, calculating the front porch, the back porch and the synchronization pulse width of each of the horizontal and vertical synchronization signals based on them, and transmitting the calculated data to the main body screen output device. And display means for displaying the video signal at the display timing output by the output means. Location adjustment method. 3. The main body screen output device confirms that a request signal is input from the screen display device within a predetermined time after transmitting a reset signal to the screen display device when power is turned on or a display resolution is changed. When the request signal is not input within the predetermined time when the status data is transmitted and the request signal is not input even after repeating the transmission of the reset signal and the input confirmation of the request signal a predetermined number of times. 2. A resolution is specified for the screen display device.
Automatic display position adjustment method described. 4. The screen display device determines whether the status data received from the main body screen output device is data within a display capability range, and determines whether the status data is within the display capability range. 2. The automatic display position adjustment method according to claim 1, wherein the status data is transmitted to the main body screen output device, and when the data exceeds the display capability range, the received video signal is displayed at a specified resolution. . 5. The screen display device, comprising: a front porch of horizontal and vertical synchronization signals corresponding to the number of horizontal dots of the screen resolution among the received screen resolution and refresh rate values. 3. The automatic display position adjustment method according to claim 2, wherein a back porch and a synchronization pulse width are calculated. 6. The apparatus according to claim 1, wherein the main body screen output device specifies the resolution of the basic screen immediately after power-on, and specifies the stored resolution before the change when the display resolution is changed. Item 3. The automatic display position adjustment method according to Item 3.