JP2008118684A - Image display apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an image display apparatus which, when displaying an on-screen display (OSD) image such as character or graphic together with a television picture or a VTR picture on a display, can display the OSD image in an easy-to-watch manner without making the television picture hard to watch. <P>SOLUTION: The image display apparatus is equipped with a display control means including a function to display then OSD image on a display screen together with a video image supplied from a video signal supply means and a function to composite the OSD image and the video image in such a way that, for a portion of the OSD image to be displayed while being superimposed over the video image, the video image is seen through the OSD image, wherein the composite is adjusted or a size of the OSD image is adjusted based on a receiving status of the video image. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

The present invention relates to an image display device, and more particularly, a television screen or VTR on a display.
The present invention relates to an image display device capable of realizing an on-screen display (hereinafter referred to as OSD) function for displaying an image such as a character or a graphic together with a screen.

Conventionally, when an image (OSD image) such as a character representing a broadcasting station or a preset SW (OSD image) is displayed on a television screen or a VTR screen, an image (video) forming a television screen or the like at the display position of the OSD image. The pixel of the image) was replaced with the pixel of the OSD image.
Therefore, the user cannot see the video image for the portion of the OSD image that has been replaced with pixels.

Further, when the OSD image is displayed in an overlapping manner on a television screen or the like, the coefficient α (0 ≦ α ≦ 1) is used for the color information of the pixel of the video image, not the simple replacement as described above.
), Multiplying the color information of the pixel of the OSD image by a coefficient β (= 1−α), and taking the sum thereof, the video image can be seen through from the bottom of the OSD image. It is known to be able to display.
In this way, by displaying the video image so that the video image can be seen through from the bottom of the OSD image, it becomes possible to see the portion that has been filled with the OSD image conventionally, and the amount of information that can be provided to the user is increased. be able to.

However, if the display is such that the video image can be seen from below the OSD image, the OSD image may be difficult to see. In particular, in the case of an image display device (for example, a television) mounted on a vehicle, the possibility is high because the display screen to be equipped is not so large.
Further, the OSD is added to a margin portion generated by reducing the video image and reducing the video image.
A method of displaying an image has also been proposed, but this makes the video image difficult to see.

Means for solving the problems and their effects

The present invention has been made in view of the above problems, and a television screen or VT is displayed on a display.
An object of the present invention is to provide an image display device capable of displaying an OSD image in an easy-to-view manner without obstructing the television screen when displaying an OSD image such as a character or a graphic together with an R screen. Yes.

In order to achieve the above object, an image display device (1) according to the present invention has a function of displaying on-screen display images such as characters and graphics on a display screen together with a video image supplied from a video signal supply means. And a function for combining the images so that the video image can be seen from below the on-screen display image with respect to a portion for displaying the on-screen display image multiplexed on the video image. In the image display device provided with the control means, the display control means has a function of adjusting the composition or a function of adjusting the size of the on-screen display image based on the reception state of the video image. It is characterized by being.

When a video image is supplied from a TV tuner or the like, the reception state of the video image is lowered, and a clear image cannot be displayed on the display screen, and the video image is displayed on the display screen. May be less valuable. In particular, when mounted on a vehicle, a relatively large number of cases as described above occur.

According to the image display device (1), for the portion where the OSD image is multiplexed and displayed on the video image, these images are combined so that the video image can be seen from below the OSD image. Furthermore, the composition adjustment is performed or the size of the OSD image is adjusted based on the reception state of the video image.

For example, when the reception state of the video image is lowered and the value of displaying the video image on the display screen is reduced, the display brightness of the OSD image is higher than the display brightness of the video image. The synthesis is adjusted so that the OSD image is displayed in a large size. Thereby, the OSD image can be easily seen.

The image display device (2) according to the present invention includes a function of displaying an on-screen display image such as characters and figures on a display screen together with a video image supplied from a video signal supply unit, and the on-screen display device. A display control unit having a function of combining the images so that the video images can be seen through under the on-screen display image with respect to a portion for displaying the display image multiplexed with the video image. In the image display device mounted on the vehicle, the display control means has a function of adjusting the composition or a function of adjusting the size of the on-screen display image based on the dynamics of the vehicle. It is characterized by being.

When the image display device is mounted on a vehicle, the OSD image becomes difficult to see if the vehicle speed is high. In particular, there is a possibility that it is very difficult to recognize and accurately operate a preset SW that is likely to be formed of small characters.

According to the image display device (2), for the portion where the OSD image is multiplexed and displayed on the video image, the images are combined so that the video image can be seen from below the OSD image. In addition, the composition adjustment or the size of the OSD image is adjusted based on the dynamics of the vehicle.

For example, when the speed of the vehicle becomes a predetermined first speed (for example, 40 km / h) or more, the composition adjustment is performed such that the display brightness of the OSD image is higher than the display brightness of the video image. Or, the OSD image is adjusted so as to be displayed larger. Thereby, the OSD image can be easily seen.

Embodiments of an image display apparatus according to the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram schematically showing a main part of an image display device according to a reference mode (1). Here, an image display device mounted on a vehicle will be described.
In the figure, reference numeral 1 denotes a television tuner for supplying a video signal for forming a video image (aspect ratio 3: 4). The television tuner 1 converts the video signal into a sync separation circuit 2 and a switch switching control signal described later, The signal to be output to the liquid crystal panel 5 (aspect ratio 9:16) is transmitted to the input terminal 3a of the switching circuit 3 for switching.

The sync separation circuit 2 is configured to transmit a vertical synchronization signal and a horizontal synchronization signal to the drawing processing circuit 4 based on the video signal from the TV tuner 1, and the drawing processing circuit 4 transmits from the synchronization separation circuit 2. Based on the vertical synchronization signal and the horizontal synchronization signal, the OS
The OSD signal is transmitted to the input terminal 3b of the switching circuit 3 in accordance with the display start timing of the D image. The drawing processing circuit 4 transmits a switch switching control signal to the switching circuit 3 in accordance with the screen scanning position of the liquid crystal panel 5 based on the vertical synchronizing signal and the horizontal synchronizing signal.

In addition, the drawing processing circuit 4 can take in a signal (for example, a signal indicating the presence / absence of an occupant in the driver's seat or the presence / absence of an occupant in the passenger seat) indicating the boarding status of the vehicle from the outside. Based on the acquired signal, the switch switching control signal is transmitted to the switching circuit 3 at a predetermined timing, or the OSD signal is transmitted to the input terminal 3b of the switching circuit 3.

For example, when there is no passenger in the front passenger seat and only the driver in the front seat, the video image is displayed close to the front passenger seat side, and the video image is displayed in close proximity. The switch switching control signal is transmitted to the switching circuit 3 so that the OSD image is displayed in the margin, and when the passenger seat is also present in the passenger seat, the video image is displayed near the driver. At the same time, the switch switching control signal is transmitted so that the OSD image is displayed in the margin formed by displaying the video image together.

That is, the drawing processing circuit 4 is a case where there is no passenger in the passenger seat and only a driver in the front seat, and the screen scanning position of the liquid crystal panel 5 is in the region E ₁₁ (see FIG. 2A). in some cases, so as to connect the input terminal 3a and the output terminal 3c in the switching circuit 3, and sends the switch changeover control signal to the switching circuit 3, on the other hand, when the screen scanning position is in the region E ₁₂ Transmits the switch switching control signal to the switching circuit 3 so as to connect the input terminal 3b and the output terminal 3c.

Conversely, when the passenger is present in the passenger seat and the screen scanning position of the liquid crystal panel 5 is in the region E ₂₁ (see FIG. 2B), the switching circuit 3 outputs the input terminal 3b and the output. Terminal 3
As to connect the c, sends the switch changeover control signal to the switching circuit 3, on the other hand, when the scanning position is in the region E _22, as to connect the input terminal 3a and the output terminal 3c, The switch switching control signal is transmitted to the switching circuit 3.
In other words, in the drawing processing circuit 4, the screen scanning position of the liquid crystal panel 5 is a blank portion (regions E ₁₂ , E
₂₁ ) so that the input terminal 3b and the output terminal 3c of the switching circuit 3 are connected only during a certain period.
The switch switching control signal is transmitted.

FIG. 2 (a) shows an example of a screen display when an OSD image is displayed in a margin formed by displaying a video image close to the driver's seat and displaying the video image in close proximity, FIG. 2B shows an example of a screen display in a case where a video image is displayed close to the passenger seat side and an OSD image is displayed in a margin formed by displaying the video image in close proximity. In addition, about the signal which showed the riding condition, the signal transmitted from the seatbelt detection sensor etc. which detect the wearing condition of a seatbelt is taken in.

According to the image display device according to the reference mode (1), the video image is not displayed so as to be positioned at the center on the display screen of the liquid crystal panel 5, but is displayed near either the left or right. The OSD image can be displayed in a margin formed by bringing the video image together.

That is, since the OSD image is displayed in the widened margin, the OSD image can be easily seen. In addition, since the video image drawing side is determined based on the boarding situation with respect to the vehicle, the OSD image can be displayed in a more suitable manner for the user.

Note that an image display device according to another reference mode can capture information on the dynamics of the vehicle, for example, when the vehicle is stopped, regardless of whether there is a passenger in the passenger seat. The video image may be displayed close to the passenger seat side so that the OSD image is displayed on the driver seat side.

FIG. 3 is a block diagram schematically showing a main part of the image display device according to the reference mode (2). However, the same components as those of the image display apparatus shown in FIG. 1 are denoted by the same reference numerals, and the description thereof is omitted here.
TV tuner 1 for supplying a video signal for forming a video image (aspect ratio 3: 4)
Transmits the video signal to the synchronization separation circuit 2, the input terminal 13a of the switching circuit 13 for switching the signal to be output to the liquid crystal panel 5 (aspect ratio 9:16) based on the switch switching control signal, and the multiplier 15. It is like that.

The sync separation circuit 2 transmits a vertical sync signal and a horizontal sync signal to the drawing processing circuit 14 based on the video signal from the TV tuner 1, and the multiplier 15 is transmitted from the TV tuner 1. The video signal is multiplied by the synthesis coefficient k ₁ (0 ≦ k ₁ ≦ 1), and the multiplication result is output to the adder 17.

The drawing processing circuit 14 matches the display start timing of the OSD image (displayed on the upper part of the display screen in the liquid crystal panel 5) based on the vertical synchronization signal and the horizontal synchronization signal transmitted from the synchronization separation circuit 2. The OSD signal is transmitted to the input terminal 13c of the switching circuit 13 and the multiplier 16, and the switch switching control is performed in accordance with the screen scanning position of the liquid crystal panel 5 based on the vertical synchronizing signal and the horizontal synchronizing signal. A signal is transmitted to the switching circuit 13.

The multiplier 16 receives the OSD signal transmitted from the drawing processing circuit 14 and the synthesis coefficient k ₂ (
= 1−k ₁ ), and the multiplication result is output to the adder 17.
The adder 17 transmits a combined signal obtained by combining the signals output from the multipliers 15 and 16 to the input terminal 13 b of the switching circuit 13.

The drawing processing circuit 14, as in the case the screen scanning position of the liquid crystal panel 5 is in the region E ₃₅ (see FIG. 4 (c)) may be connected between the input terminal 13a and output terminal 13d in the switching circuit 13 sends the switch changeover control signal to the switching circuit 13, when the screen scanning position is in the region E ₃₂ is as to connect the input terminal 13b and an output terminal 13d, the switching circuit of said switch switching control signal When the screen scanning position is outside the areas E ₃₂ and E ₃₅ , the switch switching control signal is transmitted to the switching circuit 13 so as to connect the input terminal 13c and the output terminal 13d. It is supposed to be.

4A shows an example of a screen display when the video image P ₁ is displayed at the center of the display screen E. FIG. 4B shows an OSD image P ₂ displayed at the top of the display screen E. FIG. 4C shows an example of the screen display when the video image P ₁ and the OSD image P ₂ are displayed together. In the screen display shown in FIG. 4C, the upper portion of the video image P ₁ and the central portion of the OSD image P ₂ are displayed overlapping each other.

According to the image display device according to the reference mode (2), the OSD image P ₂ is converted into the video image P _1.
As for the portion (area E ₃₂ ) multiplexed and displayed on the video image P _{2 from} the bottom of the OSD image P ₂
These images are combined so that ₁ can be seen through.
In other words, these images are synthesized by reducing the display luminance of any of these images so that the video image P ₁ can be seen through from the bottom of the OSD image P ₂ (for example, the synthesis coefficient k ₁ is set). Set to 1/2).

For the OSD image P ₂ displayed in the margin (regions E ₃₁ and E ₃₃ ), the video image P
_Since it does not overlap with ₁ and there is no need to lower the display brightness of the OSD image P ₂ , it is displayed as it is. Thus, it is possible to more visible the OSD image P _2.

In the image display device according to the above reference form (2), the OSD image is made easier to see by performing through display where it is not necessary to lower the display luminance. However, the image display device overlaps with the video image. Since there is a difference in display luminance between the part that is present and the part that is not overlapped (the part displayed in the margin part), it may be difficult for some users to see.

Therefore, in the image display device according to another reference embodiment, as shown in FIG. 5, the result multiplied by the multiplier 16 is transmitted not only to the adder 17 but also to the input terminal 13 c of the switching circuit 13. (
That is, the OSD signal subjected to multiplication processing is also transmitted to the input terminal 13c), and the OSD image displayed in the margins (areas E ₃₁ and E ₃₃ ) is also displayed so as to overlap with the video image. You may make it display with the same display brightness as an OSD image. Thereby, the said problem can be solved. In the image display device shown in FIG. 5, the same components as those in the image display device shown in FIG. 3 are denoted by the same reference numerals, and the description thereof is omitted here.

FIG. 6 is a block diagram schematically showing a main part of the image display device according to the embodiment (1). However, the same components as those of the image display apparatus shown in FIG. 3 are denoted by the same reference numerals, and the description thereof is omitted here.
TV tuner 1 for supplying a video signal for forming a video image (aspect ratio 3: 4)
Transmits the video signal to the synchronization separation circuit 2, the input terminal 13a of the switching circuit 13 for switching the signal to be output to the liquid crystal panel 5 (aspect ratio 9:16) based on the switch switching control signal, and the multiplier 15. It is like that.

The sync separation circuit 2 transmits a vertical sync signal and a horizontal sync signal to the drawing processing circuit 24 based on the video signal from the TV tuner 1, and the multiplier 15 is transmitted from the TV tuner 1. The video signal and the synthesis coefficient k ₁ (0 ≦ k ₁ ≦ 1) are multiplied, and the multiplication result is output to the adder 17.

Based on the vertical synchronization signal and the horizontal synchronization signal transmitted from the synchronization separation circuit 2, the drawing processing circuit 24 matches the display start timing of the OSD image (displayed on the upper part of the display screen in the liquid crystal panel 5). The OSD signal is transmitted to the input terminal 13c of the switching circuit 13 and the multiplier 16, and the liquid crystal panel 5 is based on the vertical synchronization signal and the horizontal synchronization signal.
The switch switching signal is transmitted to the switching circuit 13 in accordance with the screen scanning position.

The multiplier 16 receives the OSD signal transmitted from the drawing processing circuit 24 and the synthesis coefficient k ₂ (= 1−1).
k ₁ ) is multiplied, and the multiplication result is output to the adder 17. The adder 17 transmits a combined signal obtained by combining the signals output from the multipliers 15 and 16 to the input terminal 13 b of the switching circuit 13.

In addition, when the screen scanning position of the liquid crystal panel 5 is in the region E ₃₅ (see FIG. 4), the drawing processing circuit 24 switches the switch so that the input terminal 13a and the output terminal 13d are connected in the switching circuit 13. sends a switching control signal to the switching circuit 13, when the screen scanning position is in the region E ₃₂ is as to connect the input terminal 13b and an output terminal 13d, transmits the switch change-over control signal to the switching circuit 13 When the screen scanning position is outside the areas E ₃₂ and E ₃₅ , the switch switching control signal is transmitted to the switching circuit 13 so as to connect the input terminal 13c and the output terminal 13d. It has become.

Further, the electric field strength signal when a video image is received from the outside is transmitted from the TV tuner 1 to the synthesis coefficient changing means 25, and the synthesis coefficient changing means 25 is transmitted from the TV tuner 1. Based on the electric field intensity signal, the value of the synthesis coefficient k ₁ is changed, and the changed synthesis coefficient k ₁ is transmitted to each of the multipliers 15 and 16.

For example, if the synthesis coefficient changing unit 25 determines that the reception state of the video image is equal to or higher than a predetermined level based on the electric field strength signal, the synthesis coefficient k ₁ is not changed (for example, 1 /
On the other hand, if it is determined that the reception state of the video image is less than the predetermined level, the synthesis coefficient k ₁ is decreased (that is, the synthesis coefficient k ₂ is increased). Note that the change of the synthesis coefficient k _1, may be changed linearly in accordance with the reception state.

According to the image display device according to the embodiment (1), the OSD image is multiplexed and displayed on the video image so that the video image can be seen from below the OSD image. Images are synthesized, and further, the synthesis is adjusted based on the reception state of the video image.
For example, when the reception state of the video image is reduced and the value of displaying the video image on the display screen is reduced, the display brightness of the OSD image is higher than the display brightness of the video image. Thus, the synthesis adjustment is performed. Thereby, the OSD image can be easily seen.

In the image display apparatus according to another embodiment, as shown in FIG. 7, the electric field strength signal from the TV tuner 1 is also transmitted to the drawing processing circuit 24A, and the drawing processing circuit 2
4A may adjust the size of the OSD image based on the electric field strength signal transmitted from the TV tuner 1. For example, if it is determined that the reception state of the video image is less than a predetermined level based on the electric field strength signal, the OSD image is enlarged so that the OSD image can be easily seen. In the image display device shown in FIG. 7, the same components as those in the image display device shown in FIG. 6 are denoted by the same reference numerals, and description thereof is omitted here. In addition, the size may be adjusted linearly according to the reception state.

Furthermore, in the image display device according to another embodiment, information on the dynamics of the vehicle can be captured. For example, when the speed of the vehicle is equal to or higher than a predetermined speed, the OSD image The synthesis coefficient k ₁ may be decreased or the OSD image may be increased so that the display brightness is higher than the display brightness of the video image.

FIG. 8 is a block diagram schematically showing a main part of the image display device according to the reference mode (3). However, the same components as those of the image display apparatus shown in FIG. 3 are denoted by the same reference numerals, and the description thereof is omitted here.
TV tuner 1 for supplying a video signal for forming a video image (aspect ratio 3: 4)
Is an input terminal 13a of a switching circuit 13 for switching a signal to be output to the liquid crystal panel 5 (aspect ratio 9:16) based on the synchronous separation circuit 2, a switch switching control signal, a multiplier 15, and an image. The data is transmitted to the pattern detection means 35.

The sync separation circuit 2 is configured to transmit a vertical sync signal and a horizontal sync signal to the drawing processing circuit 34 based on the video signal from the TV tuner 1, and the multiplier 15 is transmitted from the TV tuner 1. The video signal and the synthesis coefficient k ₁ (0 ≦ k ₁ ≦ 1) are multiplied, and the multiplication result is output to the adder 17.

The drawing processing circuit 34 is based on the vertical synchronization signal and the horizontal synchronization signal transmitted from the synchronization separation circuit 2 in accordance with the display start timing of the OSD image (displayed on the upper part of the display screen in the liquid crystal panel 5). The OSD signal is transmitted to the input terminal 13c of the switching circuit 13 and the multiplier 16, and the liquid crystal panel 5 is based on the vertical synchronization signal and the horizontal synchronization signal.
The switch switching control signal is transmitted to the switching circuit 13 in accordance with the screen scanning position.

The multiplier 16 receives the OSD signal transmitted from the drawing processing circuit 34 and the synthesis coefficient k ₂ (= 1−
k ₁ ) is multiplied, and the multiplication result is output to the adder 17. The adder 17 transmits a combined signal obtained by combining the signals output from the multipliers 15 and 16 to the input terminal 13 b of the switching circuit 13.

In addition, when the screen scanning position of the liquid crystal panel 5 is in the region E ₃₅ (see FIG. 4), the drawing processing circuit 34 is configured to switch the switch so that the switching circuit 13 connects the input terminal 13a and the output terminal 13d. sends a switching control signal to the switching circuit 13, when the screen scanning position is in the region E ₃₂ is as to connect the input terminal 13b and an output terminal 13d, transmits the switch change-over control signal to the switching circuit 13 When the screen scanning position is outside the areas E ₃₂ and E ₃₅ , the switch switching control signal is transmitted to the switching circuit 13 so as to connect the input terminal 13c and the output terminal 13d. It has become.

The image pattern detection means 35 detects the image pattern of the video image in the area E ₃₂ where the OSD image is displayed, changes the value of the synthesis coefficient k ₁ based on the detection result, and changes the synthesized coefficient k _1. Is transmitted to each of the multipliers 15 and 16.
For example, the image pattern detection means 35 may select the area E ₃₂ (or its surrounding area including the area E ₃₂ ).
To detect whether or not the video image is formed with the same color or only the approximate color, and the region E ₃₂ is detected.
If the video image is formed with the same color or only approximate colors, the synthesis coefficient k
_In order to set ₂ to 1, the synthesis coefficient k _{1 is set} to 0.

According to the image display device according to the above reference form (3), the OSD image is multiplexed and displayed on the video image so that the video image can be seen from below the OSD image. It is designed to synthesize images.
Furthermore, when the video image of the portion displayed in a multiplexed manner with the OSD image is formed of the same color or only an approximate color (for example, in the case of a deep blue sky or the sea), the synthesis coefficient k ₁ Is set to 0, that is, the synthesis coefficient k _{2 is set} to 1, and the video image and the OSD image are synthesized. Therefore, since the OSD image is substantially the same as the through display, the OSD image can be made very easy to see.

It is the block diagram which showed roughly the principal part of the image display apparatus which concerns on a reference form (1). (A), (b) is the figure which showed an example of the screen display in the image display apparatus which concerns on reference form (1). It is the block diagram which showed roughly the principal part of the image display apparatus which concerns on a reference form (2). (A) is an example of a screen display when a video image is displayed at the center of the display screen, (b) is an example of a screen display when an OSD image is displayed at the top of the display screen, ( (c) is the figure which showed an example of the screen display in the image display apparatus which concerns on reference form (2). It is the block diagram which showed roughly the principal part of the image display apparatus which concerns on another reference form. It is the block diagram which showed roughly the principal part of the image display apparatus which concerns on Embodiment (1) of this invention. It is the block diagram which showed roughly the principal part of the image display apparatus which concerns on another embodiment. It is the block diagram which showed roughly the principal part of the image display apparatus which concerns on a reference form (3).

Explanation of symbols

3, 13 Switching circuits 4, 14, 24, 24A, 34 Drawing processing circuits 15, 16 Multiplier 17 Adder 25 Composite coefficient changing means 35 Image pattern detecting means

Claims (2)

A function for displaying on-screen display images such as characters and figures on a display screen together with a video image supplied from a video signal supply means;
A display control means having a function of combining the images so that the video images can be seen through under the on-screen display image with respect to a portion for displaying the on-screen display image multiplexed on the video image. In an image display device comprising:
The image display characterized in that the display control means has a function of adjusting the composition or a function of adjusting the size of the on-screen display image based on the reception state of the video image. apparatus. A function for displaying on-screen display images such as characters and figures on a display screen together with a video image supplied from a video signal supply means;
A display control means having a function of combining the images so that the video images can be seen through under the on-screen display image with respect to a portion for displaying the on-screen display image multiplexed on the video image. In an image display device mounted on a vehicle, comprising:
The image display device, wherein the display control means has a function of adjusting the composition or a function of adjusting the size of the on-screen display image based on the dynamics of the vehicle.

Images