JP2002016852A - Image display - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an image display in which vertical magnification of a display image can be adjusted through a simple arrangement. SOLUTION: An OSD control unit 1 reads out character code data, graphics data, attribute data and color data from a VRAM 2, and font data of the character code data and graphics data from a CGROM 3. A vertical display control circuit 5 and a horizontal display control circuit 6 are controlled to perform parallel/series conversion of the font data of character code data and graphics data read out from the CGROM 3 through a P/S circuit 11. An attribute control circuit 12 adds attribute data, a color control circuit 13 performs coloring and a magnification set register 7 sets a magnification. The vertical display control circuit 5 holds an address at an address converting position by an address conversion pulse from an address conversion circuit 8. Horizontal display line is inserted repeatedly, a vertically expanded image is displayed, and vertical magnification of the display image is altered and adjusted through a simple arrangement, thus displaying an image with an optimal visual touch.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image display device having a function of selecting and setting a vertical magnification of a display image.

[0002]

2. Description of the Related Art A television receiver has an OSD (On / Off).
Screen display) function.
With the D function, channel display, volume display, subtitle display of teletext, and the like are performed. The vertical size of characters and graphics displayed by the OSD function is determined by the cycle of the horizontal synchronization signal (HSYNC). One cycle of the horizontal synchronization signal is determined by the vertical size of one dot of display characters and display graphics. Becomes

[0003]

In the OSD function of a conventional television receiver, the cycle of a horizontal synchronizing signal for determining the vertical size differs depending on the format of the television, and the structure of characters and graphics in the vertical direction is the same. The vertical size on the actual image display will differ depending on the format even if it is configured with the number of dots. In this case, in order to unify the vertical size without depending on the television format, it is necessary to provide a plurality of patterns of characters and graphics corresponding to the format. In this case, the capacity of the font data is significantly increased.

The present invention has been made in view of the current situation of setting the vertical magnification of a display image of the OSD function as described above, and has as its object to adjust the vertical magnification of a display image with a simple configuration. A display device is provided.

[0005]

In order to achieve the above object, according to the first aspect of the present invention, there is provided a magnification setting means for setting a vertical magnification of an image display, and an address of a horizontal display line for displaying an image. Address conversion means for converting based on the vertical magnification set by the magnification setting means; and image data for a selected cycle of the corresponding horizontal synchronizing signal based on the address converted by the address conversion means. Repeat the horizontal display line at least once,
Alternatively, there is provided an image display conversion means for performing image display with a vertical magnification converted by thinning a horizontal display line for displaying image data at least once.

According to such a means, when the vertical magnification of the image display is set by the magnification setting means, the address of the horizontal display line for displaying the image is set by the address conversion means in the vertical direction set by the magnification setting means. The horizontal display line for displaying the image data is repeatedly inserted at least once in the selected cycle of the corresponding horizontal synchronizing signal by the image display converting means based on the converted address and the converted address. Or by thinning out at least once, an image display with a converted vertical magnification is performed. With a simple configuration, the vertical magnification of the display image is changed and adjusted to provide an image display with an optimal visual feel. Done.

[0007] Similarly, in order to achieve the above object, according to a second aspect of the present invention, in the first aspect of the invention, the image display conversion means performs repeated insertion or thinning of the horizontal display line by inserting or thinning. Is performed by selecting a position at which the disturbance of the display image due to is minimized.

According to such a means, the image display conversion means performs the repeated insertion or thinning of the horizontal display line,
By selecting and performing the position where the disturbance of the display image due to insertion or thinning is minimized, the operation of the invention according to claim 1 is executed.

[0009] Similarly, in order to achieve the above object, an invention according to claim 3 is characterized in that an attribute control means for adding an attribute of a display image to the invention according to claim 1 or 2; Color control means for performing a coloring process is provided.

According to such means, in addition to the effect of the invention described in claim 1 or 2, the attribute addition to the display image by the attribute control means and the coloring processing to the display image by the color control means are achieved. This gives a decorative coloring effect to the displayed image.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a block diagram showing the configuration of the present embodiment, FIG. 2 is an explanatory diagram showing the relationship between the setting of the vertical magnification and the address conversion pulse in the progressive mode of the present embodiment, and FIG. FIG. 4 is an explanatory diagram showing the relationship between the setting of the vertical magnification and the address conversion pulse in the interlace mode. FIG. 4 is an explanatory diagram showing the relationship between the address conversion pulse and the insertion of the horizontal display line in the progressive mode of the present embodiment. FIG. 5 is an explanatory diagram showing a relationship between an address conversion pulse and insertion of a horizontal display line in the interlace mode of the present embodiment, and FIG. 6 is an explanatory diagram of image display conversion of the present embodiment.

In this embodiment, as shown in FIG. 1, an OSD for controlling display of an on-screen display
A control unit 1 is provided, and the OSD control unit 1
In the above, the magnification setting register 7 for setting the vertical magnification of the display image is connected to the address conversion circuit 8 for converting the address of the image display line in the vertical direction, and the output terminal of the address conversion circuit 8 is connected to the vertical terminal of the image. It is connected to a vertical display control circuit 5 for controlling the display of the direction. The vertical display control circuit 5 of the OSD control unit 1 having such a configuration includes, via the OSD control bus B, a horizontal display control circuit 6 for controlling display of images in the horizontal direction, character code data, graphic data, and attributes. VRAM 2 storing display data such as data and color data, and a CGROM (character generator R) storing font data corresponding to character code data and graphic data.
OM) 3 are connected. Similarly, a vertical display control circuit 5 of the OSD control unit 1 has a P / S conversion circuit (parallel / serial conversion circuit) 11 for performing parallel / serial conversion of a signal via an OSD control bus B,
An attribute control circuit 12 for performing attribute control such as adding a frame to the display image, and a color control circuit 13 for coloring the display image
Is connected.

The output terminal of the CGROM 3 is P / S
The output terminal of the P / S conversion circuit 11 is connected to the attribute control circuit 12, the output terminal of the attribute control circuit 12 is connected to the color control circuit 13, and the horizontal synchronization signal (HSYNC) , Is input to the horizontal display control circuit 6 and the address conversion circuit 8, and is supplied to the vertical synchronization signal (VSYN).
C) is input to the horizontal display control circuit 6, the address conversion circuit 8, and the vertical display control circuit 5, and the clock signal DOTC
K is input to the horizontal display control circuit 6 via the frequency divider 10.

The operation of this embodiment having such a configuration will be described. In the present embodiment, the magnification setting register 7 is composed of a 5-bit register, and can set 32 types of magnifications. A case where the vertical size is enlarged will be described. As shown in FIGS. When “00000” is set as the set value in the register 7, the address conversion circuit 8 does not output an address conversion pulse for changing the address of a horizontal display line for displaying an image. on the other hand,
When the set value “00001” is set in the magnification setting register 7, one address conversion pulse is output from the address conversion circuit 8.
The address of the horizontal display line is converted at one location, the horizontal display line is repeatedly displayed at that location, and one horizontal display line is inserted into 32 lines. When the set value “00010” is set in the magnification setting register 7,
The address of the horizontal display line is converted in two places, and 32
When two horizontal display lines are inserted into the lines and the set value “11111” is set in the magnification setting register 7 in the same manner, the address of the horizontal display line is converted at 31 places, and the horizontal display line is displayed at 32 lines. 31 lines are inserted.

In the present embodiment, the progressive
In the progressive mode shown in FIG. 2 and the interlaced mode shown in FIG. To make the images the same, it is necessary to make the operation of the address conversion circuit 8 different. In FIGS. 2 and 3, the address conversion pulses are dispersedly generated so as to insert horizontal display lines at positions where the visual display feeling of the display image is not changed. An example is shown, and the generation position of the address conversion pulse is not limited to the display in FIG. 2 and FIG. In this case, the address conversion circuit 8 changes the vertical address of the display image at the position where the address conversion pulse is generated, and causes the vertical display control circuit 5 to output two horizontal display lines of the same address continuously.

In the operation of changing the vertical magnification according to the present embodiment for the display image of the character "A" displayed in the progressive mode, the setting value of the magnification setting register 7 shown in FIG. If the display image is
According to the change setting of the vertical magnification, the image is converted into a display image enlarged in the vertical direction and displayed as shown in FIG. In this case, "00000" is set in the magnification setting register 7.
Is set, the code data of the character "A" and, for example, black color data are read from the VRAM 2 by the command of the OSD control unit 1, and the font data corresponding to the code data of the character "A" is read from the CGROM 3. Is read. Then, under the control of the vertical display control circuit 5 and the horizontal display control circuit 6, the font data of the character “A” read from the CGROM 3 is subjected to parallel / serial conversion by the P / S conversion circuit 11 and input to the attribute control circuit 12. However, in this case, since the attribute data is not read from the VRAM 2, the attribute control is not performed, and the color control circuit 1
In step 3, the font data of the character "A" is subjected to black coloring processing, and an image corresponding to the pattern of the character "A" is displayed as shown in FIG.

In this embodiment, when "00111" is set in the magnification setting register 7 in order to change the vertical magnification, the addresses "03" and "0" are set as shown in FIG.
7 "," 0B ", and" 0F ", an address conversion pulse is output from the address conversion circuit 8, and the vertical display control circuit 5 outputs the address" 0 "by the output of the address conversion pulse.
3 "," 07 "," 0B "," 0F "
By holding the currently displayed address, the current horizontal display line is repeatedly inserted into the next line. Therefore, as shown in FIG. 4B, in the vertical direction of the image display, addresses “03”, “07”, “0B”,
By the address conversion in which “0F” is continuously repeated, an image of the character “A” expanded in the vertical direction is displayed.

On the other hand, in the case of the interlace mode,
If there is no line insertion shown in FIG. 5A due to the interlaced scanning, the odd lines (ODD)
Field, increment the address,
Then, an image is displayed by fixing the address to an even-numbered line (EVEN) and incrementing the address. In this case, when a line is inserted, an address conversion pulse is generated basically when the horizontal display line is an even line (EVEN).
Only when the line insertion is performed continuously on both the odd line (ODD) and the even line (EVEN), the address conversion pulse is generated also on the odd line (ODD).

When no address conversion pulse is generated, the address is incremented without switching between the odd line (ODD) and the even line (EVEN), and the even line (ODD) of the same address is displayed during the display of the odd line (ODD). EVE
When an address conversion pulse is generated at (N), the address is switched for one cycle by switching from the odd line (ODD) to the even line (EVEN). Further, when an address conversion pulse is generated during display of the even-numbered line (EVEN), the even-numbered line (ODD) is changed from the even-numbered line (EVEN).
, The address is incremented, and when an address conversion pulse is generated on both the even line (ODD) and the odd line (EVEN), both the even line (ODD) display and the odd line (EVEN) display are performed. Even lines (ODD) and odd lines (EVE) at the same address
N) are continuously generated.

The control method in these cases is not limited to the description of the above embodiment. For example, depending on the presence or absence of the generation of the address conversion pulse, the address of the line to be redisplayed is divided into the insertion of the line. It is also possible to adopt a method of calculating so as to be at a certain position.

FIG. 6 shows an example of an image display which is displayed in a vertically expanded manner in the conversion of the vertical magnification performed in the present embodiment as described above. FIG. 6A shows the horizontal display. This is an original image in which lines are not repeatedly inserted. An address conversion pulse is output from the original image at an address position indicated by △, and a horizontal line indicated by に is inserted into the next line. As shown in (), four lines are inserted in each frame to obtain a display image that is expanded in the vertical direction. In this case, the frame data is read from the VRAM 2, the frame 15 is added to the original image as an attribute, and the frame 15A corresponding to the display image displayed by converting the vertical magnification is displayed. Is added.

As described above, according to the present embodiment, the VRAM is controlled by a command from the OSD control unit 1.
2, character data, graphics data, attribute data such as a frame, and color data are read out, and CGR
The font data corresponding to the character code data and the graphics data is read from the OM 3 and is controlled by the vertical display control circuit 5 and the horizontal display control circuit 6 to control the CGROM.
3, the character code data and the font data of the graphics data are converted from parallel / serial by the P / S conversion circuit 11 and input to the attribute control circuit 12,
An attribute is added by attribute data, and a color control circuit 13 performs a coloring process on the display image. In this case, a corresponding number of address conversion pulses are output from the address conversion circuit 8 based on the magnification setting in the magnification setting register 7, and the currently displayed address is held at the address conversion position by the vertical display control circuit 5. Since the current horizontal display line is repeatedly inserted and the sentence image displayed in the vertical direction is displayed, the vertical magnification of the displayed image can be changed and adjusted with a simple configuration to achieve the optimal visual feeling Display can be performed.

In the above embodiment, the case where the display image is expanded in the vertical direction by inserting the horizontal display line has been described. However, the present invention is not limited to this embodiment. The display image can be shortened in the vertical direction by thinning out the horizontal display lines. In the embodiment, the case where the display image is applied to the OSD function has been described. However, the present invention is not limited to this embodiment. However, the present invention can be applied to general image display.

[0024]

According to the first aspect of the present invention, when the vertical magnification of the image display is set by the magnification setting means, the address of the horizontal display line for displaying the image is set by the magnification setting means by the address conversion means. The image display conversion means converts the horizontal display line for displaying the image data at least one time with respect to the selected period of the corresponding horizontal synchronization signal, based on the converted address based on the converted vertical magnification. The image is displayed with its vertical magnification changed by repeated insertion or decimating at least once, so that the vertical magnification of the displayed image can be changed and adjusted with a simple configuration to optimize the visual feel. This makes it possible to display a simple image.

According to the second aspect of the present invention, the image display conversion means performs repetitive insertion or thinning of the horizontal display line by selecting a position where disturbance of the display image due to the insertion or thinning is minimized. Item 1 can further enhance the effects of the invention.

According to the third aspect of the present invention, in addition to the effect of the first or second aspect of the present invention, the display image can be displayed by the attribute addition of the display image by the attribute control means and the coloring processing by the color control means. Can be given a decorative coloring effect.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing a relationship between setting of a vertical magnification and an address conversion pulse in a progressive mode of the embodiment.

FIG. 3 is an explanatory diagram showing a relationship between a vertical magnification setting and an address conversion pulse in an interlace mode according to the embodiment.

FIG. 4 is an explanatory diagram showing a relationship between an address conversion pulse and insertion of a horizontal display line in a progressive mode of the embodiment.

FIG. 5 is an explanatory diagram showing a relationship between an address conversion pulse and insertion of a horizontal display line in an interlace mode according to the embodiment.

FIG. 6 is an explanatory diagram of image display conversion of the embodiment.

[Explanation of symbols]

1. OSD control unit, 2. VRAM, 3. C
GROM, 5 vertical display control circuit, 6 horizontal display control circuit, 7 magnification setting register, 8 address conversion circuit, 12 attribute control circuit, 13 color control circuit.

Claims (3)

[Claims] 1. Magnification setting means for setting a vertical magnification of image display; address conversion means for converting an address of a horizontal display line for displaying an image based on a vertical magnification set by the magnification setting means; Based on the address converted by the conversion means, for a selected cycle of the corresponding horizontal synchronization signal,
Image display conversion means for repeatedly inserting a horizontal display line for displaying image data at least once or thinning out a horizontal display line for displaying image data at least once to display an image with a converted vertical magnification. An image display device characterized by the above-mentioned. 2. The image display conversion means according to claim 1, wherein said horizontal display line is repeatedly inserted or thinned out by selecting a position where disturbance of a display image due to insertion or thinning is minimized. Image display device. 3. An image display device according to claim 1, further comprising: an attribute control unit for adding an attribute of the display image; and a color control unit for performing a coloring process on the display image. An image display device characterized by the above-mentioned.