JP2002041026A - Video display method and video display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make an OSD display size changeably automatically according to a screen size. SOLUTION: It is composed of an input signal source 24, a monitor 10 that displays a video signal from this input signal source, a scan converter 28 that converts to be displayable on a screen of the monitor, a character generating means 32 to display characters overlapped on the display screen based on the video signal and a control section 30 that are fed information from a key operating part. When a change instruction of a size of the display screen is performed from the key operating part, in the control part, a scan instruction signal to the monitor and a variable magnification instruction signal for a variable magnification to characters are generated and the generated variable magnification instruction signal is fed to the character generating means. By this, when the size of the display screen is changed, as the OSD display size is changed automatically, it makes easy to watch the OSD display and at the same time can realize the display without the sense of incongruity.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video display method and a display device for displaying a character in an overlapping manner on a display screen of an image. For details, the character is displayed over the display screen size determined based on the input signal source, and when the display screen size is changed, the character display size is also changed according to the display screen size, There is no character display.

[0002]

2. Description of the Related Art An image display device such as a television receiver or a computer, which is capable of displaying characters such as numbers and symbols on a display screen.
There is a known device that has a function of providing a function of changing a screen size displayed on a screen.

In this case, when a video signal generated by a computer or the like is displayed on a monitor, for example, a flat monitor using a liquid crystal or the like, the standard screen size Sa of the monitor is set as shown in FIG.
, The display screen size Sb of the input video signal itself may be smaller than the standard screen size Sa. Therefore, when this input video signal is projected on the monitor 10 as shown in FIG. 11, the relationship between the display screen size Sb at that time and the screen size (standard screen size) Sa determined by the monitor 10 is as shown.

The monitor 10 is provided with a group of several operation keys 12 for selecting an OSD display. In addition, the power key 14 of the monitor 10 and further,
A light receiving element 16 and the like for receiving a remote control signal are provided. These function as a key operation unit 36 described later.

This kind of video display device has a function of changing the input display screen size as described above. Therefore, for example, when the zoom display mode is selected for the input display screen size Sb shown in FIG. As shown in FIG. 12, the input screen is displayed in the same size Sb ′ as the standard screen size Sa of the monitor 10.

An input display screen size Sb shown in FIG.
FIG. 1 shows an example in which an OSD display is performed on the input display screen while an image is displayed on the monitor 10 in FIG.
3 is shown. In the example shown in the figure, when characters for OSD display are vertically arranged on the input display screen size Sb in FIG. 10, the character size is selected so that 10 characters can be displayed. FIG. 13 shows a display of ten numbers arranged side by side.

[0007] The display size of the character is selected as described above in order to make the character displayed on the OSD with respect to the input display screen size Sb easy to see in a range that does not cause any discomfort.

[0008]

When the display screen size is changed in the OSD display mode, for example, when the zoom display mode is changed to the same size as the standard screen size Sa, as shown in FIG. Is displayed. That is, the input display screen size Sb 'is zoomed to the standard screen size Sa, but the size of the character A displayed by OSD is displayed as it is.

Therefore, as shown in FIG. 15, for example, when the two characters “mute” are displayed over the input display screen size Sb as the OSD display, they are displayed in a size matching the input display screen size Sb. On the other hand, if this is changed to the zoom display mode, the character will be in a display state as shown in FIG.

As described above, in the zoom display mode, only the display screen size Sb is zoomed to become a large screen size Sb ', whereas the character size for the OSD is not zoomed and displayed, so that it is zoomed. Character "silence" for the displayed screen size Sb '
Feel too small. As a result, an OSD display with a sense of incongruity is displayed, and the character becomes slightly difficult to see. In this case, the OSD display does not function sufficiently.

In view of the above, the present invention has solved such a conventional problem. In particular, when the OSD display is superimposed and displayed, the input display screen size is changed.
It is an object of the present invention to propose a video display method and a video display device in which the OSD display size is also changed and displayed at the same time to realize a character display that is easy to see and that does not cause a sense of incongruity.

[0012]

According to a first aspect of the present invention, there is provided a video display method for displaying an image of an input signal source on a screen of a monitor. In displaying the character generated by the character generating means on top of the display screen, the display size of the character is changed according to the change of the display screen size.

According to a fourth aspect of the present invention, there is provided an image display apparatus, comprising: an input signal source; a monitor for displaying an image signal from the input signal source; A scan converter for converting the display so that it can be displayed, a character generating means for displaying the character over the display screen based on the video signal, and a control unit to which information from the operation unit is supplied, The control unit detects a display screen size of the input signal source, and generates a scan size instruction signal for smoothing the scan frequency of the input signal source to a scan frequency for monitor display based on the detected output. At the same time, when an instruction to change the display screen size is given from the operation unit, the control unit sends a scan size instruction to the monitor. No. and magnification ratio indication signal for magnification for the character is generated, the magnification instruction signal generated is equal to or adapted to be supplied to the character generator.

According to the present invention, when the size of the input display screen size is changed, the character size of the OSD display superimposed on the input screen is also changed.
For example, when the input display screen size is zoomed and changed so as to be the same as the standard screen size of the monitor, the character size of the OSD display is changed to a size suitable for the standard screen size.

The size of the screen size can be realized by measuring the number of vertical lines. Then, the character size is calculated based on the number of vertical lines. If the size of the character is automatically changed in accordance with the screen size, the character corresponding to the changed screen size can be displayed, so that the characters displayed in a superimposed manner can be easily seen and the discomfort of the OSD display can be eliminated.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of a video display method and a video display device according to the present invention will be described in detail with reference to the drawings.

FIG. 1 shows a case where the video display device 20 according to the present invention is applied to a video display device that also serves as a television monitor. The monitor 10 is a monitor for television video, and in this example, 1024 dots × 768 lines. This is a case where a flat display monitor composed of a liquid crystal display element or the like is used.

A key operation unit 36 is provided on a part of the monitor 10, in this example, on the right side. As described above, the key operation unit 36 is for receiving the key group 12 including a plurality of operation keys for adjusting the brightness of the displayed image and the character displayed on the OSD, the power key 14, and the remote control signal. Are provided.

As the input signal source 24, in addition to a television video signal, a multimedia signal such as a computer graphic video signal generated by a computer or the like can be considered. From this input signal source 24, in this example, R,
Each of the G and B analog primary color signals is output as a video signal, and horizontal and vertical synchronizing signals H and V separated from each other are output.

These primary color signals are supplied to an A / D converter 26 at the next stage.
And converted into an 8-bit digital primary color signal in this example. Horizontal and vertical synchronizing signals H and V are also supplied to the A / D converter 26 in order to synchronize clocks for A / D conversion.

A / D converted digital primary color signal R
a, Ga, and Ba are further supplied to a scan converter 28, where a scan conversion process is performed so that an image based on the digital primary color signals Ra, Ga, and Ba can be displayed on the monitor 10.

The scan conversion is a process of converting the input number of dots of one horizontal line into the standard number of dots of the monitor 10 (1024 dots) in the case of a video input for a television monitor. This is a process for converting the number into the standard line number (768 lines) of the monitor 10. In the case of a video input for computer graphics, the display size of one standard character (one character) is changed by the number of dots according to the image size (display screen size) of the video supplied from the input signal source 24. And the process of converting the number of lines.

For a video input from the input signal source 24,
A character scaling instruction signal indicating how much the number of dots and lines is converted into a character size of one character is generated by the control unit 30 including a microcomputer or the like. Therefore, at least the primary color signals Ra, Ga, and Ba and the horizontal and vertical synchronization signals H and V from the input signal source 24 are supplied to the control unit 30 as reference signals for calculating the display screen size.

A horizontal section (number of dots) and a vertical section (number of lines) where the primary color signal exists are calculated by the control section 30 based on the supplied synchronization signals H and V, and the display screen size of the input video signal is calculated. Sb is calculated. A signal related to the calculated display screen size is supplied as a control signal for A / D conversion, and is used as a scan size instruction signal (scan conversion instruction signal) for determining a scan signal for the monitor 10. 28, and is also supplied to the character generation means 32 as a character variable magnification instruction signal.

The calculation of the display screen size of the input video signal in this manner does not necessarily mean that the input video signal having the same screen size as the standard screen size Sa is input, and the input video signal of any screen size is supplied. This is because it is not possible to determine whether the display is performed or not, and it is necessary to calculate the display screen size based on the input video signal each time.

The control unit 30 is supplied with a key signal from the key operation unit 36 described above. The key signal is input signal source 2
4, an input signal for screen display adjustment, a scaling signal for changing the display screen size Sb, and the like. The control unit 30
It is also configured to be able to receive a key signal from a remote controller or a keyboard (both not shown) instead of the key operation unit 36.

Now, in this embodiment, in addition to such a configuration, in this embodiment, an OSD generating means 32 is provided, which further functions as a character generating means.
A mixer 34 is provided, and character signals such as characters, graphics, and symbols generated by the OSD generating means 32, in this example, three character signals Rb, Gb,
Bb is supplied to the mixer 34.

The mixer 34 mixes the digital primary color signals Ra, Ga, Ba output from the scan converter 28 with the character signals Rb, Gb, Bb, and supplies the mixed synthesized signals Ro, Go, Bo to the monitor 10. Is done. At the display screen position of the monitor 10 corresponding to the generation timing of the character signals Rb, Gb, and Bb, a display screen (display image) based on the primary color signals Ra, Ga, and Ba with a size corresponding to the size of the character signals Rb, Gb, and Bb ) Is displayed on top.

The size of the character generated by the OSD generating means 32 varies depending on the display screen size Sb of the input signal source displayed on the monitor 10. Control unit 3
In the case of 0, a scan size instruction signal for determining the display screen size Sb is generated based on a command from the key signal, and a magnification change instruction for displaying a character matching the size of the designated display screen size Sb. A signal is generated.

When the character size displayed by the character scaling instruction signal is changed and, for example, a display mode in which the display screen size Sb is displayed in the maximum display mode, that is, the zoom mode is designated, the display screen is displayed as shown in FIG. The size Sb is changed to the zoom screen size Sb '.

At the same time, the OSD display is also displayed at the zoom size. That is, the characters A1 to A10 displayed on the display screen Sb 'are zoomed and displayed as shown in the figure. When the original screen is zoomed in this way, the OSD display that is displayed superimposed on the original screen is also zoomed and displayed at the same magnification. Therefore, for example, two characters “mute” are replaced with the standard screen size Sb.
In this case, the character is displayed in the size as shown in FIG. 3, whereas when the mode is changed to the zoom display mode, two characters "mute" are displayed in the size as shown in FIG.

If the OSD display is changed in accordance with the change in the size of the original display screen as described above, the sense of discomfort between the original display screen and the OSD display can be eliminated.

Of course, the original display screen is replaced with the original size Sb.
When an instruction is issued to return the display size to OSD, the display magnification is changed so that the OSD display size is also the same as the instructed display screen size.

Now, when the input screen is displayed in the size Sb as shown in FIG. 10, the character size to be superimposed is determined in advance so that the size matches the display screen size Sb. For this reason, the control unit 30 uses the input video signal to calculate the substantial size (W
h, Wv) are calculated, and a character size suitable for OSD display is calculated from this. The character size refers to the number m of constituent dots of one character and the number n of constituent lines. The (m × n) character scaling ratio instruction signal is supplied to the character generation unit 32, and the character generation unit 32 outputs the character 1 based on the character scaling ratio instruction signal.
The size of the character is determined.

FIG. 5 is a flowchart showing an embodiment when the control unit 30 determines the character size.

First, it is checked whether or not there is a zoom display mode instruction (step 41). When there is no instruction for the zoom display mode, the display screen size is determined from the input video signal (step 42). This determination step 42
In order to calculate a substantial screen size from an input video signal, the number of horizontal pixels (number of dots) Wh and the number of vertical lines Wv are measured using the presence or absence of a video signal.

From this measurement result, a magnification for obtaining the character size of the OSD display superimposed on the display screen size is calculated (step 43). As described above, when the standard size of one character is 16 lines, and the input display screen size Sb is set to a size capable of displaying characters by 10 lines in the vertical direction, the calculated display screen The magnification ratio M of the character is determined as follows: 16 × 10 × M <Wv (1) so as to match the size. As a result of the measurement, when the number of vertical lines Wv of the display screen size of the input video signal is, for example, 480, the scaling factor is M = 3 from Expression (1).

Next, the size of one character is determined based on the scaling factor M calculated in step 43 (step 44). In the example described above, since the scaling factor M is “3”, the standard character size is tripled. That is, the number of vertical lines of one character is 16 lines × 3 = 48 lines. At the same time, the number of horizontal dots is set to three times the standard number of horizontal dots (12 dots × 3 = 36 dots).

The control unit 30 outputs data of M = 3 as a character scaling ratio instruction signal to the character generation unit 3.
Send to 2. The character generating means 32 outputs one character of the character so as to be 36 dots × 48 lines based on the magnification.

On the other hand, when it is determined in step 41 that the zoom display mode has been instructed, the number of vertical lines Wv of the display screen size Sa is set to the maximum number of effective lines of the monitor 10 (step 45). For example, when the vertical line number Wv of the monitor 10 is 768 lines, the maximum effective line number is used as the measured vertical line number.

In step 43, a new scaling factor M is calculated based on the number of vertical lines Wv. According to the example described above, the scaling factor M is M = 4.8 from the equation (1). Therefore, in this case, M is set to 4 (step 4).
4). Therefore, one character is enlarged and displayed as (48 dots × 64 lines).

In the above example, it is conceivable that M = 5. However, in this case, the character size becomes too large, and a part of the characters displayed in the uppermost and lowermost rows may be missing and displayed. Because there is.

When the character generating means 32 is configured to be able to process a variable magnification M other than an integer, the calculated variable M itself is supplied to the character generating means 32.

Since the display screen size based on the input video signal is always detected in step 42, no matter what display screen size is input, the display screen size S
The character size can be changed to b.

In the above-described embodiment, the case where a single screen is displayed on the monitor 10 and the OSD display is superimposed on the single screen has been exemplified. For example, as shown in FIG. Are displayed at the same time, and an OSD display, for example, a character character "A" is displayed on each of them, the present invention can be applied.

In this case, conventionally, the characters "A" displayed on the respective display screens have the same size as shown in FIG. Therefore, even if the display screen sizes are different as shown in the figure, the display sizes are the same.

According to the present invention, since the display screen size is calculated for each display screen, the character "A" can be displayed in a size matching the display screen size as shown in FIG.

Alternatively, when two screens are displayed in the same size as shown in FIG. 8, the characters superimposed on this are the same size. In the example of the figure, the channel number “1”
This shows a state where “0” and “8” are superimposed and displayed. When the display mode is selected such that the left screen is the main screen and the right screen is the sub-screen as shown in FIG.
The display screen size is controlled such that the parent screen is large and the child screen is small. At the same time as the size change, according to the present invention, the character size is displayed larger on the parent screen than on the child screen, so that the displayed character is easy to see and there is no uncomfortable feeling. This is because the displayed character has a size that matches the screen size.

In the above-described embodiment, the numerical values used are merely examples, and the present invention is not limited to these values.

[0050]

As described above, according to the present invention, when the size of the input display screen size is changed, the character size superimposed and displayed on the input screen is also changed at the same time.

According to this, for example, when the input display screen size is zoomed and the size is changed so as to be the same as the standard screen size of the monitor, the character size is also changed according to the magnification. In this way, by automatically changing the size of the character according to the screen size, it is possible to display the character that fits the changed screen size, so it is easier to see the characters that are displayed in layers, and the discomfort of the character display Can be wiped.

Therefore, the video display method and the video display device according to the present invention are extremely suitable for application to a video display system capable of handling multimedia images such as computer images and television images.

[Brief description of the drawings]

FIG. 1 is a system diagram of a main part showing an embodiment of a video display device according to the present invention.

FIG. 2 is an explanatory diagram showing an OSD display state in a zoom display mode.

FIG. 3 is an explanatory diagram showing an example of an OSD display with an input display screen size.

FIG. 4 is an explanatory diagram showing an example of an OSD display in a zoom display mode.

FIG. 5 is a flowchart of a processing example showing an embodiment of a video display method according to the present invention.

FIG. 6 is an explanatory diagram showing another embodiment of the video display method of the present invention.

FIG. 7 is an explanatory diagram showing a conventional display example for comparison with the example of FIG. 6;

FIG. 8 is an explanatory view showing another embodiment of the video display method of the present invention (part 1).

FIG. 9 is an explanatory view showing another embodiment of the video display method of the present invention (part 1).

FIG. 10 is an explanatory diagram showing a relationship between an input display screen size and a standard screen size.

FIG. 11 is an explanatory diagram showing an example of an input display screen size when displayed on a monitor.

FIG. 12 is an explanatory diagram illustrating a display example of an input screen for zoom display.

FIG. 13 is an explanatory diagram showing a relationship between an input display screen size and an OSD display size.

FIG. 14 is an explanatory diagram showing a relationship with an OSD display size in a zoom display mode.

FIG. 15 is an explanatory diagram showing a relationship between an OSD display size and an input display screen size when a specific character is displayed by OSD.

FIG. 16 is an explanatory diagram showing a relationship between an OSD display size and an input display screen size when a specific character is OSD-displayed in a zoom display mode.

[Explanation of symbols]

20 ... video display device, 10 ... monitor, 24 ...
An input signal source, 26 A / D converter, 28 scan converter, 30 control unit, 32 character generation means (OSD generation means), 34 mixer

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H04N 5/445 H04N 5/66 D5 / 66 G09G 5/36 520M F-term (Reference) 5C023 AA02 AA14 AA18 AA38 BA11 CA03 CA05 5C025 BA28 CA06 CA11 5C058 AA00 AA01 BA17 BA18 BA21 BB17 5C082 AA02 BA02 BA12 BA27 BA34 BA35 BC03 BC05 BD01 BD02 CA32 CA56 CB03 DA86 MM10

Claims (8)

[Claims] When displaying an image of an input signal source on a screen of a monitor and superimposing a character generated by a character generating means on the display screen, the image forming apparatus includes: A video display method, wherein the display size of the character is changed. 2. The video display according to claim 1, wherein the display screen size is calculated from the number of vertical lines that determines a substantial screen size from an input signal source displayed on the screen. Method. 3. The video display method according to claim 1, wherein the character size after the change is determined based on the standard character size. 4. An input signal source, a monitor for displaying a video signal from the input signal source, a scan converter to which the video signal is supplied and converted to be displayed on a screen of the monitor, and the video signal And a control unit to which information from an operation unit is supplied, wherein the control unit detects a display screen size of the input signal source. A scan size instruction signal for converting the scan frequency of the input signal source into a scan frequency for monitor display is generated based on the detection output, and a display screen size change instruction is issued from the operation unit. The control unit sends a scan size instruction signal to the monitor and a magnification ratio instruction to the character. Signal is generated, the magnification instruction signal generated video display device, characterized in that it is adapted to be supplied to the character generator. 5. The video display device according to claim 4, wherein said monitor is a cathode ray tube or a flat display panel. 6. The video display device according to claim 4, wherein the display screen size of the input signal source is obtained from the number of vertical lines and the number of horizontal pixels of the video signal that determine the substantial image size. 7. The magnification of the character is calculated based on the number of vertical lines after the change.
The image display device according to the above. 8. The video display device according to claim 1, wherein said character generation means is an OSD circuit.