JPH11272247A - Monitor display device control method and monitor display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method and device for easily adjusting the display position of RGB data on a monitor to the position desired by a monitor user, when indefinite colors are displayed on the monitor while using a display controller which controls a display device such as a monitor. SOLUTION: A monitor display device has a horizontal width value increasing/decreasing circuit 7 which sets the width of a horizontal front porch in order to control the display position of RGB data on a monitor screen by varying the timing of the output of a horizontal synchronization signal produced by a display controller, and thus indirectly controlling the timing of a horizontal blank signal produced within the monitor.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a monitor display device, and more particularly to a monitor display device in which only a horizontal synchronizing signal, or a horizontal synchronizing signal, a vertical synchronizing signal, and an RGB data signal as a color signal are inputted. The present invention relates to a data display position adjusting method and an apparatus therefor.

[0002]

2. Description of the Related Art In a conventional display controller, when displaying an image on the entire screen of a monitor display device, it is necessary to hold RGB output data for one horizontal line in the controller. However, there is a limit to the RGB data buffer capacity, and it is assumed that “the horizontal size of the monitor display device> the display controller RGB data buffer capacity”.
When a monitor display device is connected to a display controller, an area for displaying an indefinite color is generated on the screen corresponding to the difference, giving an unnatural feeling to the monitor user.

Japanese Patent Application Laid-Open No. Hei 5-73022 discloses a display control device in which a front porch detection circuit and a back porch detection circuit count using a dot clock, compare the values, and if there is a difference, adjust via a delay device. Although it is disclosed that the front porch and the back porch are equalized, this is different from the position adjustment by controlling the horizontal blank signal in the present invention.

[0004]

The above-mentioned conventional display control device comprises a porch detecting section for detecting a front porch and a back porch based on a synchronizing signal, a blanking signal and a predetermined unit signal, and a porch detecting section. Based on the front porch and the back porch, the apparatus controls at least one of the synchronization signal and the blanking signal to set the front porch and the back porch to a predetermined value. To place it in a position,
There is a problem that a porch detection unit and a device for controlling a blanking signal or a synchronization signal based on the detection result are required, and the device becomes expensive.

An object of the present invention is to provide a general horizontal synchronizing signal,
Provided is a monitor display device control method and a monitor display device having a display controller for preventing a viewer from recognizing an irregular color portion on a screen generated by an RGB data signal even when the RGB signal period is short. It is to be.

[0006]

According to a first aspect of the present invention, there is provided a method for controlling a monitor display device, comprising the steps of:
There is a horizontal front porch width increasing / decreasing procedure for adjusting the display position of the data signal to a position desired by the monitor user.

A second aspect of the monitor display method according to the present invention relates to a monitor display device which controls a horizontal RGB data display position of a monitor by inputting only a horizontal synchronizing signal and an RGB data signal and not inputting a blank signal. In the control method of (1), there is a procedure for adjusting the period width of the horizontal front porch period.

Further, the procedure for adjusting the period width of the horizontal front porch period includes a procedure for automatically converging to a preset operation range or a manual adjustment procedure.

[0009] A first type of monitor display device of the present invention comprises:
There is a horizontal front porch width increasing / decreasing means capable of adjusting the display position of the RGB data on the monitor screen to a position desired by the monitor user.

A second type of monitor display device of the present invention receives only a horizontal synchronization signal and an RGB data signal,
In a monitor display device to which a blank signal is not input, a means for adjusting a period width of the horizontal front porch period is provided.

Furthermore, a horizontal blank signal counter,
A horizontal blank signal width setting register, a horizontal front porch counter, a horizontal front porch width setting register, a horizontal synchronization signal counter, and a horizontal synchronization signal width setting register; Means for adjusting the period width of the porch period adjusts the input value using the operation permission / prohibition input, and outputs the adjusted setting value to the horizontal front porch width setting register. is there.

Further, by setting the vertical front porch width in addition to the horizontal front porch width setting, the vertical position can be adjusted.

[0013]

Embodiments of the present invention will now be described with reference to the drawings.

FIG. 1 is a diagram showing the relationship between a display controller 101 according to a first embodiment of the present invention and a monitor display device (hereinafter referred to as a monitor) 102. The display controller 101 generally has a synchronization signal generation block shown in FIG. 2 and a buffer (not shown) for holding RGB data for one horizontal line, and the horizontal synchronization signal S1 generated / held by this block. The horizontal blank signal S2 and the RGB data signal S3 held in a buffer (not shown) are output to the monitor 102.

In a monitor capable of inputting all of these signals, as shown in FIG. 3, a period during which the horizontal blank signal S2 is at a high level (hereinafter referred to as an A period) is an actual display period in one horizontal line. For this reason, the display controller 101
Holds the RGB data signal S3 for the A period, and outputs RGB data only for the A period.

However, many of the monitors on the market are
In many cases, only the horizontal synchronizing signal and the RGB data signal are input, and no blank signal is input.

In this case, since the monitor internally generates a blank signal according to the input synchronization signal as shown in FIG. 4, the display period also depends on the monitor. If the RGB signal output period (period A) is shorter than the monitor display period (period B), that is, during the period of B−A = C, the display controller does not perform the RGB data output. An indeterminate color is displayed.

The example shown in FIG. 3 is a phenomenon in which many indefinite colors are displayed on the left side of the monitor display surface. In order to make this defect inconspicuous to the monitor user, the horizontal R
The GB data display position may be adjusted to the center of the monitor screen, and the C period may be equally divided into the left and right.

Next, the operation of the first embodiment will be described. An object of the present invention is to adjust the display position of RGB data on a monitor by increasing or decreasing the width of a horizontal front porch generated by a display controller and changing the output timing of a horizontal synchronization signal to be output.

Referring to FIG. 4, the details of the waveform of the horizontal synchronizing signal output by the display controller will be described. Horizontal synchronization signal S1
Changes from the timing (timing 1) at which the level of the horizontal blank signal S2 changes through a horizontal front porch period. The RGB signal S3 is output in synchronization (fixed) with the timing (timing 2) at which the level of the horizontal blank signal changes.

In the case of a monitor in which the horizontal blank signal shown in FIG. 4 is not inputted from the outside, the horizontal synchronizing signal S1 and the RGB data signal are inputted (step 31), and internally generated based on the inputted horizontal synchronizing signal S1. The image is displayed on the screen by combining the horizontal blank signal thus obtained and the RGB data signal S3 output from the display controller.
Since the output timing of the RGB data signal of the display controller is fixed to the timing 2 in FIG. 4, the output timing of the horizontal synchronization signal generated by the display controller is changed, and the timing of the horizontal blank signal generated inside the monitor is changed. If the control is performed indirectly, the display position of the RGB data on the monitor display screen can be controlled as a result (step 32).

That is, in the display controller having the block configuration shown in FIG. 2 and outputting the waveform shown in FIG.
By adjusting the period width th of the horizontal front porch period, the output timing of the horizontal blank signal generated inside the monitor with respect to the RGB data signal output timing can be changed.

The display position of the RGB data on the monitor needs to flexibly correspond to the display range of the indefinite color, the characteristic unique to the monitor, the preference of the monitor user, and the like. Therefore, the display controller cannot fix the value of the horizontal front porch width setting register 4. Therefore, as shown in FIG.
The display controller is provided with a mechanism for automatically increasing or decreasing the value of the horizontal front porch width setting register, and the monitor user is enabled / disabled to operate this mechanism so that the monitor user can change the RGB data display position. It can be adjusted arbitrarily. The operation of the horizontal width value increasing / decreasing circuit 7 for increasing / decreasing the horizontal front porch width is based on the value of the horizontal front porch width setting register 4 based on the timing 1 in FIG. Can be increased or decreased within the range described above.

Therefore, when the horizontal front porch width is automatically set, the operation permission / prohibition switch is enabled, the horizontal width value increasing / decreasing circuit 7 is started, and the numerical value is sequentially changed. After stopping, the numerical value is registered in the horizontal front porch width setting register 4.

At the time of manual operation, a horizontal synchronizing signal and an RGB data signal are inputted (step 41), and a desired value of the width of the horizontal front porch is externally set in a horizontal horizontal front porch width setting register (step 42).

The numerical value is automatically changed by starting the operation permission of operation permission / prohibition (steps 43 and 4).
4), when the adjustment proceeds and reaches a desired value, the position is fixed (step 45).

FIG. 6 shows the change of the horizontal front porch width Wh when the value of the horizontal front porch width setting register 4 is reduced from the value at the time "1" to the value at the time "2". This is shown as a display example.

In the above-described embodiment of the present invention, the front porch for horizontal synchronization has been described as the first embodiment. However, as a second embodiment, the vertical porch is naturally added to the first embodiment. In addition to the front porch, the vertical porch signal and the vertical blank signal are additionally controlled in this case, and in addition to FIGS.
4 is added.

FIG. 9 is a diagram showing a second embodiment of the display controller of the present invention.
FIG. 7 is a diagram showing a relationship between a monitor 104 and a horizontal synchronization signal S1, a horizontal blank signal S2, and an RGB data signal S3 to which a vertical synchronization signal S4 and a vertical plank signal S5 are added.

The display controller 103 has a vertical synchronizing signal generation block shown in FIG. 10 in addition to the horizontal synchronizing signal generation block shown in FIG. 2 and holds one vertical line of RGB data. It also has a buffer (not shown), and outputs the vertical synchronizing signal S4 and the vertical blank signal S5 generated / held by the generation block to the monitor 104 in addition to the horizontal data (step 51).

When there is no RGB data holding buffer for the vertical line, the RGB data for one horizontal line is not provided.
The data holding buffer may be used repeatedly.

In a monitor capable of inputting all of these signals, as shown in FIG. 11, a period during which the vertical blank signal S5 is at a high level (hereinafter referred to as a D period) is an actual display period in one vertical line. For this reason, the display controller 10
3 holds the RGB data signal for the D period, and outputs the RGB data only for the D period.

Therefore, the non-display period can be adjusted by controlling the position of the vertical synchronizing signal (step 52).

However, many of the monitors on the market are
In many cases, only horizontal and vertical synchronization signals and RGB data signals are input, and no blank signal is input.

The second embodiment will be described below with reference to FIGS. 10 to 14, mainly regarding the vertical front porch width, since the horizontal front porch width is the same as that of the first embodiment.

In this case, the monitor internally generates a vertical blank signal according to the input vertical synchronizing signal as shown in FIG. 12, so that the display period also depends on the vertical blank signal of the monitor. It is assumed that RG is longer than the monitor display period (E period).
If the B signal output period (D period) is short, or
If there is a limit to the number of times that the RGB data buffer for one horizontal line can be used repeatedly, the display controller does not perform the RGB data output during the (ED period =) F period, so that the monitor is in the corresponding period. Displays indefinite colors.

The example shown in FIG. 11 is a phenomenon in which many irregular colors are displayed on the upper side of the monitor. In order to make this defect inconspicuous to the monitor user, the vertical RGB
The data display position may be adjusted to the center of the monitor screen, and the F period may be equally divided vertically.

Next, the operation of this embodiment will be described. According to the present invention, the width of the vertical front porch generated by the display controller is increased or decreased to change the output timing of the output vertical synchronizing signal, so that the R on the monitor is changed.
The purpose is to adjust the GB data display position.

FIG. 12 shows the details of the vertical synchronizing signal waveform output by the display controller. The level of the vertical synchronizing signal changes through a vertical front porch period from the timing when the level of the vertical blank signal changes (timing 3). The RGB signal is synchronized (fixed) with the timing (timing 4) at which the level of the vertical blank signal changes.
And output.

In the case of a monitor which does not receive a vertical blank signal from the outside, the vertical blank signal generated internally and the RGB data signal output from the display controller are combined on the basis of the input vertical synchronizing signal, and displayed on the screen. An image is displayed (step 61).

Since the output timing of the RGB data signal of the display controller is fixed to the timing 2 in FIG. 12, the output timing of the vertical synchronization signal generated by the display controller is changed, and the vertical blank signal generated inside the monitor is changed. , The display position of the RGB data on the monitor can be controlled as a result.

That is, in the display controller having the block configuration shown in FIGS. 2 and 10 and outputting the waveforms shown in FIGS. 4 and 12, the period width th of the vertical front porch period
And tv, the horizontal blank signal and the vertical blank signal generated inside the monitor with respect to the RGB data signal output timing can be changed.

The display position of the RGB data on the monitor display screen needs to flexibly correspond to the display range of the indefinite color, the characteristic unique to the monitor, the preference of the monitor user, and the like. Therefore, the display controller uses the vertical front porch width setting register 1
Even the value of 4 cannot be fixed.

Therefore, as shown in FIG. 14, the display controller is provided with a mechanism for automatically increasing or decreasing the value of the vertical front porch width setting register, and the monitor user is allowed to operate / prohibit this mechanism. Accordingly, the monitor user can arbitrarily adjust the RGB data display position.

The operation of the vertical width value increasing / decreasing circuit 17 is performed by setting the value of the vertical front porch width setting register 14 within a range where the lower limit is 0 and the upper limit is the vertical blank signal width with reference to the timing 3 in FIG. Can be increased or decreased.

Therefore, in the case of manual operation, the setting of the front porch width is started with the operation permission / prohibition switch enabled, and the numerical value is continuously changed by the operation of the vertical width value setting circuit 17 so that the desired value is obtained. If it has reached, stop (prohibition) is set and the set value is fixed. If automatic, the front porch width is set in advance in the width value increasing / decreasing circuit 17 (step 62), operation is permitted, and the operation is started (step 6).
3, 64), and is fixed when the set value is reached, and registered in the vertical front porch width setting register 14 (step 65).

FIG. 14 shows the change in the vertical front porch width Wv when the value of the vertical front porch width setting register 14 is reduced from the value at "part 3" to the value at "part 4". This is shown as a display example.

That is, in the second embodiment, the horizontal front porch width set in the first embodiment and the above-mentioned vertical front porch width make it possible for the RGB data to have the same horizontal front por- A display having a porch and back porch width and having equal vertical front porch width and vertical back porch width is obtained.

[0049]

As described above, according to the display controller of the present invention, the RG is smaller than the horizontal display size of the monitor.
Even a display controller with a small B signal output size,
Since the portion where the indeterminate color occurs can be equally divided into left and right, it is possible to reduce the possibility of giving the monitor user an unnatural feeling. In addition, the display position in the horizontal direction can be adjusted without the need for a complicated analog circuit, and there is an effect that a flexible monitor can be manufactured at low cost.

Further, since the display position can be freely set by the monitor user, the monitor maker does not need to pay attention to the initial setting of the display position.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing signals input from a display controller to a monitor.

FIG. 2 is a diagram illustrating a horizontal synchronization signal generation block.

FIG. 3 is a diagram illustrating an RGB data signal output period synchronized with a horizontal blank signal.

FIG. 4 is a diagram showing a timing of a horizontal blank signal generated according to an input horizontal synchronization signal.

FIG. 5 is a diagram illustrating a horizontal synchronization signal generation block according to the first embodiment of the present invention.

FIG. 6 is a diagram showing an adjustment state of a horizontal front porch width.

FIG. 7 is a flowchart of monitor adjustment of the monitor having the input shown in FIG. 1;

FIG. 8 is a flowchart of a horizontal front porch width setting automatic adjustment method in a monitor to which a horizontal blank signal is not input.

FIG. 9 is a schematic diagram of a monitor that inputs a horizontal synchronization signal, a vertical synchronization signal, a horizontal blank signal, a vertical blank signal, and an RGB signal from a display controller.

FIG. 10 is a diagram illustrating a vertical synchronization signal generation block.

FIG. 11 is a diagram showing an RGB data signal output period synchronized with a vertical blank signal.

FIG. 12 is a diagram showing the timing of a vertical blank signal generated according to an input vertical synchronization signal.

FIG. 13 is a diagram illustrating a vertical synchronization signal generation block according to a second embodiment of the present invention.

FIG. 14 is a diagram showing an adjustment state of a vertical front porch width.

FIG. 15 is a flowchart of monitor adjustment of the monitor having the input shown in FIG. 9;

FIG. 16 is a flowchart of a vertical front porch width setting automatic adjustment method in a monitor to which a vertical blank signal is not input.

[Description of Signs] 1 horizontal blank signal 2 horizontal blank signal width setting register 3 horizontal front porch counter 4 horizontal front porch width setting register 5 horizontal synchronization signal counter 6 horizontal synchronization signal width setting register 7 horizontal width value increase / decrease circuit 11 vertical Blank signal 12 Vertical blank signal width setting register 13 Vertical front porch counter 14 Vertical front porch width setting register 15 Vertical synchronization signal counter 16 Vertical synchronization signal width setting register 17 Vertical width value increase / decrease circuit

Claims (13)

[Claims] 1. A method for controlling a monitor display device, comprising a horizontal front porch width increasing / decreasing procedure for adjusting a display position of an RGB data signal, which is a color signal, on a monitor display device to a position desired by a monitor user. A method for controlling a monitor display device, comprising: 2. A method of controlling a monitor display device in which only a horizontal synchronizing signal and an RGB data signal which is a color signal are input and a blank signal is not input, further comprising a step of adjusting a period width of a horizontal front porch period. A method for controlling a monitor display device. 3. The method according to claim 2, wherein the step of adjusting the width of the horizontal front porch period includes a step of automatically converging to a preset operation range. 4. The method according to claim 2, wherein the step of adjusting the width of the horizontal front porch period is a manual adjustment procedure. 5. A monitor display device, comprising: a horizontal front porch width increasing / decreasing means capable of adjusting a display position of RGB data as a color signal on the monitor display device to a position desired by a monitor user. Monitor display device. 6. A monitor which receives only a horizontal synchronizing signal and an RGB data signal which is a color signal and does not receive a blank signal, the monitor comprising a means for adjusting a period width of a horizontal front porch period. Display device. 7. A horizontal blank signal counter, a horizontal blank signal width setting register, a horizontal front porch counter, a horizontal front porch width setting register, a horizontal synchronization signal counter, and a horizontal synchronization signal width setting register. Means for inputting a reference clock and adjusting the period width of the porch period to adjust the set value input by the operation enable / disable input, and output the adjusted set value to the horizontal front porch width setting register The monitor display device according to claim 6, wherein the monitor display device is a horizontal width value increasing / decreasing circuit. 8. A method for controlling a display device of a monitor, comprising: adjusting a display position of an RGB data signal, which is a color signal, on a monitor display device to a position desired by a monitor user; A method for controlling a display device of a monitor, comprising the steps of: 9. A horizontal synchronizing signal, a vertical synchronizing signal, and RG
A method of controlling a monitor display device which receives only a B data signal and does not receive a blank signal, the method including a step of adjusting a period width of a horizontal and vertical front porch period. 10. The method according to claim 9, wherein the step of adjusting the period width of the horizontal and vertical front porch periods includes a step of automatically converging to a preset operation range. 11. The method according to claim 9, wherein the step of adjusting the width of the horizontal and vertical front porch periods is a manual adjustment procedure. 12. A monitor display device which receives only a horizontal and vertical synchronizing signal and an RGB data signal as a color signal and does not receive a blank signal, and has means for adjusting a period width of a horizontal and vertical front porch period. A monitor display device characterized by the above-mentioned. 13. A horizontal and vertical blank signal counter, a horizontal blank signal setting register, a vertical blank signal width setting register, a horizontal front porch counter, a vertical front porch counter, and a horizontal front porch width setting register. And a vertical front porch width setting register, a horizontal synchronization signal counter, a vertical synchronization signal counter, a horizontal synchronization signal width setting register, and a vertical synchronization signal width setting register. The means for adjusting the period width of both porch periods is operation permission /
13. The monitor display according to claim 12, comprising a horizontal width increasing / decreasing circuit and a vertical width increasing / decreasing circuit for adjusting the set value input by the prohibition input and outputting the adjusted set value to the horizontal and vertical front porch width setting registers, respectively. apparatus.