JP3285003B2 - Display device with additional drawing function - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display device having a drawing function adding mechanism having a mechanism for adding a drawing function.

[0002]

2. Description of the Related Art In a TV scanning type display device or a workstation display device according to the present invention, if they are of a card slot type and have a control unit of a card size of about 6U (233 mm × 160 mm), the control unit is: It comprises a CPU, a GDC (graphic display controller), an LUT (lookup table), a D / A, and the like.
In such a control card, conventionally, the bus on the card slot side (rear side) is used for a system bus by the CPU and a graphic data bus between the GDC and the LUT, so that data transmission between the LUT and the D / A is performed. In many cases, the method is performed using the front side of the card.

In order to improve the drawing speed in such a card, it is general to increase the processing performance of the CPU and GDC, but there is a limit to that. Therefore, in order to further increase the drawing performance, the same CPU, GDC, L
A system in which a plurality of combinations of UTs (hereinafter referred to as drawing functions) are provided and driven in parallel is employed. In this method, generally, a configuration is adopted in which a subgraphic control unit is configured in units of a set of CPU, GDC, and LUT, and the subgraphic control units are connected in multiple stages. When generating output data required by parallel driving, an output of a certain LUT is connected to an input of another LUT, and an output of the LUT is further connected to an input of another LUT. In this method, a plurality of LUTs are connected in series to sequentially combine signals in each LUT. The combined output is output from the last LUT to the D / A. In this case, data transmission between the LUTs is often performed using the front side of the card, as in the case of the data transmission between the LUT and the D / A described above.

[0004]

By the way, in the above-mentioned parallel drive system, in order to cope with high-speed data transmission, the connection between a plurality of LUTs is as short as possible and crosses with other wiring. It is desirable to make connections so as to reduce the number. However, the connection between each LUT and the LU
When both the connection between the T and the D / A are performed simultaneously on the front side, it is impossible to realize such a connection unless the positions of the input / output connectors of the LUT are exchanged.
Therefore, two types of LUTs with different positions of the input / output connector
Is required. In addition, in such a case, a connection error such as a wrong insertion into the slot may occur.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a display device with a drawing function extension mechanism which can add a drawing function by connecting a plurality of LUTs in series with one kind of LUT. I do.

[0006]

In order to solve the above-mentioned problems, the invention according to claim 1 has means for synthesizing an output from another control card and its own output and outputting the combined output. A plurality of control cards having the same configuration for realizing a drawing function in the card, a display signal output card for receiving a signal output from the control card and outputting a display signal, and a plurality of control cards and a display signal output card mounted so as to be interchangeable. And a plurality of connection boards for connecting between each control card and between the control card and the display signal output card, and driving the drawing function of each control card in parallel to output a display signal. Each of the control cards is provided with one set of input / output connectors of the same shape provided at one end of each control card and input / output signals of the set of input / output connectors. It is characterized in that it comprises a switching circuit for selectively switching connections to any of the input and output connectors.

Further, the invention according to claim 2 is characterized in that the selection circuit switches the connection of the connector according to the input / output state of a predetermined terminal in each input / output connector. The invention according to claim 3 is characterized in that the input / output state of the predetermined terminal is a state as to whether or not a loop is formed between the predetermined terminals.

The invention according to claim 4 is characterized in that the selection circuit selects connection of a connector according to an address of a card slot to be inserted.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. First, the features of the entire embodiment will be described with reference to FIGS. This embodiment is a TV scanning type display device or workstation,
They are a card slot type and have a control unit with a card size of about 6 U. The control unit is a CPU card 101 and a graphic display controller card 102 (hereinafter referred to as G
DC card), a look-up table card 103 (hereinafter referred to as LUT card), a video D / A converter card 104 (hereinafter referred to as D / A card), and the like.
A sub-graphic control unit (control card 3) comprising a combination of a C card and an LUT card (hereinafter referred to as a drawing function)
, 300-N) (1st stage, 2nd stage,..., Nth stage), driven in parallel, and configured to combine output data in an LUT. It is adopted for. The present invention relates to an LUT card and
When data transmission between the card and the D / A card is performed using the front of the card, the LUT
Input / output ports on the front side of the card are separated into upper and lower connectors (FP1 and FP2), and input / output is automatically performed in the connection state of the display data bus connection board 400 connecting the input / output ports (connectors). A distinctive switching circuit 10 is provided.

That is, in the present embodiment, FIG.
As shown in FIG. 2 and FIG. 2, for a configuration having a plurality of drawing functions, the input / output port portion on the front side of the LUT card is separated into upper and lower connectors (FP1, FP2) according to the present invention. In the connection state of
Circuits for automatically distinguishing (switching circuit 10 in FIG. 1 and input / output port switching circuits 10a and 10b in FIG. 2) are provided.

The input / output port switching circuits 10a and 10b
As shown in FIG. 2, a contact (electrical or mechanical contact) for switching the input / output of FP1 / FP2 and a switching control circuit are configured according to the connection form of the display data bus connection board. An operation of automatically switching the input and output of the FP2 is executed.

Here, for example, as shown in FIG. 3, the switching determination is performed by using the empty pin 2 in the display data bus connection board 400.
This can be realized by making a loop circuit using one of them, and setting the side on which the loop is formed as the output and the side on which the loop is not formed as the input. Therefore, there can be obtained an effect that parallel driving of a plurality of drawing functions can be realized by one type of LUT card, and connection errors can be eliminated.

Hereinafter, the present embodiment will be described in detail with reference to the drawings. FIG. 1 shows a control unit according to the present embodiment. The drawing data from the CPU 1 is input to the GDC 2 via the system bus 201, and is written as bit map data in a frame memory 3 (hereinafter, FM). The output of the FM 3 is sequentially read out at the timing of TV scanning through the graphic data bus 202, and the luminance and color are set by the LUT 4 and output to the selection circuit 5. In the selection circuit 5, the background color register 8 set by the CPU 1 and the read data from the LUT 4 are compared by a comparison circuit 9, and if the background color is other than the background color (all colors), the first stage LU
If the T4 output is the background color, the LUT output from the second stage is selected by selection 5, and the DUT output is passed through the display data bus 203 to the DUT.
/ A6. The D / A 6 converts the digital signal into an analog signal and displays it on a display device such as a CRT 7.
In this configuration, the CPU card 101 replaces the CPU 1 with the GD
The C card 102 includes the GDC 2 and the FM 3, the LUT card 103 includes the LUT 4, the selection circuit 5, the background color register 8, the comparison circuit 9, and the switching circuit 10, and the D / A card 104 includes the D / A 6 wp.

[0014] The above circuit configuration is composed of a plurality of CPU cards,
It is composed of three types of sub-graphic control units, a GDC card and an LUT card. In this case, time synchronization between the GDCs 2 including synchronization and delay of reading is achieved.

FIG. 2 shows a specific example of the configuration of the switching circuit 10 for switching the input / output of FP1 / FP2 in the LUT card. I / O port switching circuit 1 corresponding to switching circuit 10
0a and 10b are set to FP by switching each contact.
1 is input / FP2 is output state, FP1 is output / FP2
Switches the connection state of the input / output connector between the two states of input.

FIG. 3 shows a configuration plan for specifically realizing the above. This figure shows a case where control cards are connected in three stages. A sub-graphic control unit (control cards 300-1 and 300-3) composed of a CPU card, a GDC card, and an LUT card
00-2, 300-3) are mounted in a card box so that they can be rearranged. The system bus 201 between the CPU card and the GDC card is placed below the rear connector (on the rear side in the figure).
A graphic data bus 202 between the GDC card and the LUT card is provided above the rear connector, and a display data bus 203 is provided.
Above and below the front connector. Display data bus 20
3 has an input and an output, which are connected as shown below.

The first-stage LUT card output is connected to a D / A card. As for the LUT card output, the first stage is the lower stage output,
The upper stage input, the second stage is the upper stage output, the lower stage input, and the third stage is the upper stage input and the lower stage output. By connecting this with the display data bus connection board 400, a plurality of subgraphic control units are connected.

Hereinafter, the operation of the present embodiment will be described. First, the operation of each block in FIG. 1 is as described above, is well known to those skilled in the art, and is not directly related to the present invention.

As shown in FIG. 2, the input / output port portion on the front side of the LUT card 103 is connected to upper and lower connectors (FP).
1, FP2) and the input / output is switched by the switching circuit 10. The switching circuit 10 inputs and outputs FP1 / FP2 according to the connection form of the display data bus connection board 400.
Performs the action of switching automatically.

In the switching determination, for example, as shown in FIG. 3, two empty pins in the display data bus connection board are used to form a loop circuit, the side on which the loop is formed is output, and the loop is output. By taking the unconfigured side as input,
Realize. That is, in the example shown in FIG. 3, each of the connectors FP1 and FP2 and the connector of the D / A card have four terminals for connection determination. Each of the four terminals is a set of terminals connected to each other on the card (two terminals each indicated by white circles arranged vertically in the figure) and
One terminal outputs a predetermined detection signal, and the other terminal detects whether the detection signal can be detected.
A set of terminals (two terminals indicated by black circles arranged vertically in the figure)
It is. In this case, the display data bus connection board is provided with wiring such that each of the two pins used for switching determination has a directionality in a pair of connection terminal groups. That is, only two terminals indicated by white circles are connected to the input side, and only two terminals indicated by black circles are connected to the corresponding terminal of the adjacent card on the output side. Therefore, when connecting the display data bus connection board, the input / output direction is adjusted to a predetermined direction.

As described above, according to the present embodiment,
It is possible to achieve parallel driving of a plurality of drawing functions with one type of LUT card, and it is possible to eliminate connection errors.

Next, another embodiment of the present invention will be described. As another embodiment of the present invention, the basic configuration is as described above. For example, an Nth-stage subgraphic control unit is replaced with an image processing unit represented by a video capture unit, a radar scan converter unit, and the like. It is obvious that the same effect can be obtained if the same input / output port and switching circuit are provided in the input / output stage.

In the above-described embodiment, the switching determination by the loop circuit has been described as an example.
For example, it is obvious that the same effect can be obtained by using a method of making a determination based on the address of the inserted card slot or a method of providing a setting for determination on the display data bus connection board.

[0024]

As described above, according to the present invention, 1
With a variety of control cards, a plurality of control cards can be connected in a shape that can be driven in parallel, and a drawing function can be added.

[Brief description of the drawings]

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

FIG. 2 is a block diagram showing an LUT card 103 in FIG. 1;

FIG. 3 is an explanatory diagram showing a mounting state in the card box of the embodiment of FIG. 1;

[Explanation of symbols]

7 CRT 10 Switching circuit 101 CPU card 102 GDC card 103 LUT card 104 D / A card 10a, 10b I / O port switching circuit 300-1, 300-2, 300-3, ..., 300-N
Control card 400 Display data bus connection board FP1, FP2 I / O port (connector)

────────────────────────────────────────────────── ─── Continuation of the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) G09G 5/00-5/42 G06T 1/00, 11/60 G06F 3/14-3/153

Claims (4)

(57) [Claims] A plurality of control cards having the same configuration for realizing a drawing function in each control card, comprising means for combining and outputting an output from another control card and its own output; A display signal output card that outputs a display signal in response to an output signal, a card box in which a plurality of control cards and a display signal output card are interchangeably mounted, and a connection between each control card and between the control card and the display signal output card. A display device comprising a plurality of connection boards, and a display signal output by driving the drawing function of each control card in parallel, wherein each control card is provided in one end of each control card. An input / output connector having the same shape, and a switching circuit for selectively switching and connecting an input signal and an output signal to an arbitrary input / output connector of the set of input / output connectors. A display device with a drawing function extension mechanism, comprising: 2. The display device with a drawing function extension mechanism according to claim 1, wherein the selection circuit switches connection of the connector according to the input / output state of a predetermined terminal in each input / output connector. 3. The display device with a drawing function extension mechanism according to claim 2, wherein the input / output state of the predetermined terminal is a state as to whether or not a loop is formed between the predetermined terminals. 4. The display device with a drawing function extension mechanism according to claim 1, wherein said selection circuit selects connection of a connector according to an address of a card slot to be inserted.