JPH0816152A - Display controller - Google Patents

Abstract

PURPOSE:To accelerate optionally plural making of a transparent color and rewrite of the transparent color in superimposition of plural pictures in a display controller used for navigation system, etc. CONSTITUTION:Display data color address signals a1, a2 are read out from first and second memories 1, 2 successively by the controller 7 to be converted into corresponding color signals b1, b2 for display data by first and second color palettes 3, 4. These signals are inputted to a selector 5, and a color signal (D) for synthesis display data as the result of superimpose of the display data is obtained by a selector selection signal (c) from the first color palette 3 to be displayed on a display device 6. By giving not only color information for first display data to the first color palette 3, but also the information as the selector selection signal (c) at every color address, plural transparent colors of the first display data projecting the second display data are taken simultaneously, and the number and the combination are changed freely, and the rewire of the transparent color specification is accelerated also.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention, in a screen display of a navigation system, a game machine or the like, is a display capable of speeding up the designation of a plurality of transparent colors to be the foreground plane and the rewriting of transparent colors when superimposing a plurality of images. It relates to a control device.

[0002]

2. Description of the Related Art FIG. 4 is a schematic block diagram showing an example of a conventional display control device of this type. In FIG. 4, 31 is a first memory for storing color address information of the first display data which is the foreground surface, 32 is a second memory for storing color address information of the second display data which is the background surface, and 33 is a first memory. A first color palette for outputting a display data color signal b ₁ based on the display data color address signal a ₁ from the memory 31, and a reference numeral 34 for display data based on the display data color address signal a ₂ from the second memory 32. A second color palette for outputting the color signal b ₂ , 35 is a reference register for storing comparison information in advance, 36 is a display data color address signal a ₁ from the first memory 31 and a comparison signal e from the reference register 35. Compare the comparator for outputting a selector selection signal c, 37 may show a first display data for color signal b ₁ based on the selector selection signal c from the comparator 36 Ri, selector outputs the combined display data for color signal d show the second display data for color signal b _2, 38 is a color display on the screen based on a color signal d output synthetic display data from the selector 37 display The device, 39 is a write device for the first memory 31 and the second memory 32,
It is a control device that performs read control, write control for the first color palette 33, second color palette 34 and reference register 35, and display control for the display device 38.

Next, the operation of the above conventional example will be described.
First, the write control signal from the control device 39 is used to advance the first
The first display data color address information and the second memory are stored in one memory 31.
The second display data color address information is also controlled by the memory 32.
In response to a write control signal from the device 39, the first color pattern
The color information for the first display data and the second color in the let 33.
The color information for the second display data is further added to the palette 34.
The write control signal from the controller 39 causes a reference register.
The comparison information is written in each of the stars 35. This state
In response to the read control signal from the control device 39,
The first display data color address information from the memory 31
The second display data color address information from the memory 32 is displayed on the display device.
Sequential reading is performed in synchronization with the display control signal to the storage unit 38.
The first color palette 33 and the second color palette 34
Send each to. First color palette 33 and second color palette
34 indicates the first and second display data color address information.
The first and second display data color address signals a corresponding to
₁, A₂Is received from the first memory 31 and the second memory 32.
Corresponding to the first and second display data color address information
First and second display data color signals b₁, B₂
To the selector 37. On the other hand
The data 36 is the first display data read from the first memory 31.
Color address signal a₁And comparison from the reference register 35
Comparing with signal e, comparator output as comparison result
The signal is input to the selector 37 as the selector selection signal c.
It The selector 37 uses the first memory read from the first memory 31.
1 Display data color address signal a₁And the reference register 35
If the comparison signal e from the
Color signal b for the second display data from the palette 34₂To
It is selected and sent to the display device 38. First memory at this time
1st display data color address signal a from 31₁Is that
For example, the color for the second display data from the second color palette 34.
-Signal b₂Is a transparent color for displaying on the display device 38.
It Conversely, if they do not match, the first color palette
Color signal b for the first display data from the switch 33 ₁Select
And sends it to the display device 38. Therefore, as a foreground plane
First display data color address signal a of the first memory 31 of₁
In advance to the comparison information of the reference register 35, if necessary.
By writing it together, the second background
Second display data color address signal a of the memory 32₂Picture with
Area synthesis can be realized.

[0004]

However, in such a conventional configuration, in order to obtain the composite display data color signal d as a result of superposition of the foreground surface and the background surface to be sent to the display device 38, the comparator 36 is used. First display data color address signal a read from the first memory 31
From the comparison result of 1 and the comparison signal e of the reference register 35, the selector 37 outputs two color signals b1 for display data.
The first display data color address signal a ₁ of the first memory 31 as a transparent color for selecting the second display data color signal b ₂ from the second color palette 34 in order to select one from b ₂ is , One of the plurality of color addresses of the first color palette 33, which is one of the comparison signals e from the reference register 35, and the transparent color of the foreground surface showing the background surface is one color at the same time. It had a problem that it could only be taken.

The present invention solves the above-mentioned conventional problems, and in superimposing a plurality of screens, it is possible to simultaneously take a plurality of transparent colors of the foreground plane showing the background plane, and speeding up the rewriting of the transparent color designation. It is an object of the present invention to provide a display control device capable of performing the above.

[0006]

In order to achieve the above object, the present invention uses a plurality of memories storing display data color address information and display data color address information read from each memory as an input. A plurality of color palettes for respectively outputting display data color information and selector selection information corresponding to address information, and a plurality of display data color information from each color palette are input,
A selector that outputs color information for combined display data based on the selector selection information; a display device that performs display based on the color information for combined display data; and a write and read operation of display data color address information for each memory,
A display device for controlling a display operation and an operation for writing information to each color palette;
The color palette includes not only display data color information but also selector selection information for each color address.

[0007]

According to the present invention, in order to obtain the color information for the combined display data as a result of superimposing a plurality of screens to be sent to the display device by the above-mentioned structure, not only the color information for the display data but also the selector selection information is provided in the color palette. Is assigned to each color address and one of the color information for multiple display data is selected by this selector selection information, so that when the multiple screens are overlapped, multiple transparent colors of the foreground surface showing the background surface are simultaneously displayed. Can be taken. Also,
By writing the selector selection information portion provided for each color address in the color palette all at once by the control device, rewriting of the transparent color designation can be speeded up.

[0008]

【Example】

(Embodiment 1) Hereinafter, a first embodiment of the present invention will be described with reference to FIG.
The description will be made with reference to FIG. FIG. 1 is a schematic block diagram showing a first embodiment of the present invention, and FIG. 2 is a first block diagram in FIG.
It is a figure explaining the content of the color palette 3. In FIG. 1, 1 is a first memory that stores first display data color address information as a foreground surface, 2 is a second memory that stores second display data color address information as a background surface, and 3 is a first memory.
A first color palette that receives the first display data color address signal a ₁ read from the memory 1 and outputs the first display data color signal b ₁ and the selector selection signal c corresponding to the first display data color address signal a _1. 4 is the second
Second color palette for outputting a second display data for color signal b ₂ corresponding to the second display data color address signals a ₂ second display data color address signals a ₂ read out from the memory 2 as an input, the 5 first Color signals b ₁ and b ₂ for display data from the color palette 3 and the second color palette 4 are input, and a color signal for combined display data is generated based on a selector selection signal c provided for each color address of the first color palette 3. A selector 6 outputs d, and a display device 6 performs display based on the composite display data color signal d from the selector 5. 7 is a control device,
A control signal necessary for writing and reading operation of the display data color address signals a ₁ and a _{2 to} the memory 1 or the second memory 2, a control signal necessary for display operation to the display device 6, the first color palette 3 and the second color palette 3. A control signal necessary for writing the color signal information for display data and the selector selection signal information to the color palette 4 is generated. In FIG. 2, 8 is color signal information for display data,
Reference numeral 9 is selector selection signal information, which is set for each color address.

Next, the operation of the above embodiment will be described.
First, in response to a write control signal from the control device 7, the first display data color address information is stored in the first memory 1 and the second memory 2 is stored.
The second display data color address information is written in each. Further, in response to a write control signal from the control device 7, the display data color signal information 8 and the selector selection signal information 9 are written in the first color palette 3, and the display data color signal information is written in the second color palette 4 for each color address. . The display data color signal information 8 is information such as an RGB signal, for example. It should be noted that the number of simultaneous color generation at the time of display is determined by the number of color addresses. After setting such a state,
Next, the display data color address signals a ₁ and a ₂ are sequentially read from the first and second memories 1 and 2 by a read control signal from the control device 7 and input to the first and second color palettes 3 and 4, respectively. . The first color palette 3 outputs the display data color signal b ₁ and the selector selection signal c corresponding to the input display data color address signal a ₁ , and the second color palette outputs the input display data color address signal. The display data color signal b ₂ corresponding to a ₂ is output and input to the selector 5, respectively. In the selector 5, one of the display data color signals b ₁ and b ₂ is selected and output by the selector selection signal c and sent to the display device 6. The series of operations up to this point are performed in synchronization with control signals such as horizontal / vertical synchronization signals from the control device 7 to the display device 6.

In the selector selection signal c, information on whether or not to select the first display data color signal b ₁ as the foreground plane is written. When the information that the selection is not performed is written, the color signal d for the combined display data output from the selector 5 is included in the color signal b for the second display data.
_{When the second} color is output and the information to select is written, the color of the display data color signal b ₁ is output. Therefore, if the information that the color signal b ₁ for the first display data is not selected is written in the selector selection signal c in advance, the selector selection signal c is originally the first display data color address signal a from the first memory 1. ₁
Since it is determined by the display data color address signals a ₁ from the first memory 1 as a foreground plane, as a transparent color for imaging the display device 6 a second display data for color signal b ₂ as background surface Can be operated.
The selector selection signal c is sent to the first color palette 3
Since a plurality of transparent colors up to the number of color addresses of the first color palette 3 are simultaneously set on each screen, the display data color from the first memory 1 as the foreground plane is simultaneously set. It becomes possible to have the address signal a ₁ . Further, by rewriting a necessary portion of the selector selection signal c set for each color address of the first color palette 3 by the write control signal of the control device 7 for each color address in the time region where the display device 6 is not displayed. , The number and combination of multiple transparent colors can be freely changed. Further, the selector selection signal c set for each color address of the first color pallet 3 is rewritten collectively by the write control signal of the control device 7 not for each color address at once, thereby speeding up rewriting of transparent color designation. It becomes possible to do.

As described above, according to the display control apparatus of this embodiment, in order to obtain the color signal d for the composite display data as a result of superimposing a plurality of screens to be sent to the display apparatus 7,
The first color pallet 3 for the foreground plane has not only the color signal b ₁ for the first display data but also the selector selection signal c for determining whether or not the foreground plane is transparent, for each color address. By selecting one of the two display data color signals b ₁ and b ₂ on the basis of the selection signal c and outputting it as the composite display data color signal d, when the two screens are superposed, the background It is possible to simultaneously obtain a plurality of transparent colors of the foreground surface that reflects the image, and to freely change the number and combination of the plurality of transparent colors. Further, by rewriting the selector selection signal c which the first color pallet 3 for the foreground plane has for each color address all at once by the writing control signal of the control device 7, rewriting of the transparent color designation is speeded up. It is also possible.

(Second Embodiment) Next, a second embodiment of the present invention will be described with reference to FIG. The display control device shown as the first embodiment has two superpositions of display data, but in the present embodiment, the number is m (m is an integer of 2 or more). 3, is 11 to 14 first n for outputting the n-th display data color address signals a ₁ ~a _m
Memory, 15-18 for the n display data corresponding to the n display data color address signals a ₁ ~a _m as inputs the n display data color address signals a ₁ ~a _m read from the n memory 11-14 The n _- th color palette for outputting the color signals b _{1 to} b _m and the n-th selector selection signals c _{1 to} c _m-1 , 19 is the n-th color palette from the n-th color palettes 15-18.
The display data color signals b _{1 to} b _m are input, and m display data colors are generated based on the nth selector selection signals c ₁ to _{cm 1} that are provided for each address of the nth color palette 15 to 17. A selector 20 selects any one of the signals b _{1 to} b _m and outputs a composite display data color signal d as a result of superimposing the display data m pieces. Reference numeral 20 denotes a composite display data color d. It is a display device for displaying. Reference numeral 21 denotes a control device, which is a control signal necessary for writing and reading operation of nth display data color address information to the nth memories 11 to 14, a control signal necessary for display operation of the display device 20, and the nth color palette 15.
Control signals necessary for writing the display data color signals b _{1 to} b _m and the selector selection signals c _{1 to} c _m-1 to

Next, the operation of the above embodiment will be described. In the present embodiment, in the superposition of the display data of the first embodiment, the first is replaced with the (n-1) th and the second is replaced with the nth. Therefore, also in this case, the same effect as the effect in the display control device in which the display data is superposed two times is produced. That is, for each of a plurality of display data, an arbitrary plurality of transparent colors up to the number of color addresses possessed by the nth color palettes 15 to 17 at the same time can be displayed simultaneously.
A selector selection signal which can be included in the n-th display data color address information from the memories 11 to 13 and is set for each color address of the n-th color palette 15 to 17 in the non-display time area of the display device 20. c _{1 to} c
It is also possible to freely change the number and combination of a plurality of transparent colors by rewriting the necessary part of _m-1 for each color address by the write control signal of the control device 21.
In addition, the selector selection signals c ₁ to _{cm 1} set for each color address of the nth color palette 15 to 17 are controlled by the write control signal of the control device 21 at once not for each color address for each color palette. By collectively rewriting, it is possible to speed up the rewriting of the transparent color designation. Further, even when the display control device is configured to superimpose the display data for m, it is not always necessary to superimpose the display data by m, and the number of display data is less than m depending on the content of the display data to be handled. It can also be used as a superposition of a number of display data, and a display control device having flexibility and versatility can be realized.

In this embodiment, m memories are used in order to construct a display control device for superimposing display data for m, but the memory having a plurality of ports can reduce the memory to m or less. You can also do it. In this case,
Since the number of parts of the entire display control device can be reduced, cost reduction, size reduction, reliability improvement, and the like can be obtained.

[0015]

As is apparent from the above embodiments, according to the present invention, in order to obtain color information for composite display data as a result of superimposing a plurality of screens sent to a display device,
Not only the color information of the display data but also the selector selection signal information is provided for each color address in the color palette corresponding to the foreground surface, and the selector superimposes the plurality of display data color information on the basis of this selector selection signal information. In superimposing a plurality of screens, a plurality of transparent colors of the foreground plane showing the background plane can be simultaneously taken, and the number and combination of plural transparent colors can be freely changed.

Further, in the color pallet corresponding to the foreground plane, the selector selection information held for each color address is collectively written at once by the control device, whereby the rewriting of the transparent color designation can be speeded up.

[Brief description of drawings]

FIG. 1 is a schematic block diagram of a display control device showing a first embodiment of the present invention.

FIG. 2 is a schematic diagram illustrating the contents of a first color palette according to the first embodiment.

FIG. 3 is a schematic block diagram of a display control device showing a second embodiment of the present invention.

FIG. 4 is a schematic block diagram showing an example of a conventional display control device.

[Explanation of symbols]

 1 1st memory 2 2nd memory 3 1st color palette 4 2nd color palette 5 Selector 6 Display device 7 Control device 11 1st memory 12 2nd memory 13 m-1 memory 14 mth memory 15 1st color palette 16 Second color palette 17 m-1 color palette 18 mth color palette 19 Selector 20 Display device 21 Control device a Display data color address signal b Display data color signal c Selector selection signal d Composite display data color signal

Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI Technical display area G09G 5/06 9377-5H

Claims (2)

[Claims] 1. A plurality of memories for storing display data color address information, and display data color information and selector selection information corresponding to the display data color address information with the display data color address information read from each memory as an input. A plurality of color palettes to be output respectively, a plurality of selectors for inputting a plurality of display data color information from each of the color palettes, and outputting composite display data color information based on selector selection information; and a composite display data color A display device for displaying information based on information, and a control device for controlling a writing and reading operation of display data color address information to and from the memory, a display operation to the display device, and an information writing operation to each of the color palettes. , The color palette is color information for display data In addition, a display control device provided with selector selection information for each color address. 2. The display control device according to claim 1, wherein the selector selection information included in the color palette is written at once by the control device.