JPH0345395B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Field of Industrial Application> The present invention relates to a display information generation circuit, and more particularly to a display information generation circuit that can rapidly generate display information for color-specific display on a display unit.

<Prior Art> Hereinafter, as a conventional technology, an attitude indicator used in an aircraft, for example, will be described with reference to the drawings.

FIG. 9 is a block diagram of a conventional display information generation circuit for an attitude indicator.

In Fig. 9, input signal (posture input signal) i
is guided to the input I/F (interface) 1a of the symbol generator 1. This input signal i
is generated into color-coded display information (S _R , S _G , S _B ) by the graphics controller 1b and the frame memory 1c that stores RGB pixel/image information, and the color-coded display information S is generated via the output I/F 1d. _R out,
It is output to the display unit 2 as S _G out and S _B out.

The operation of each part shown in FIG. 9 will be explained below with reference to FIGS. 10 to 12 which are used to explain the conventional technology. Incidentally, here, the display section 2 in FIG.
For example, the display color of
etc.) is white (W, that is, when all R, G, and B pixels are on), the background color of the upper part is displayed in green (G), and the background color of the lower part is displayed in red (R).
Indicates the case where This will be explained below.

For example, as shown in FIG.
Each dot has RGB pixels, and it consists of a large number of dots arranged vertically and horizontally.

Regarding part A of the display section 2 in FIG. 9, for example, the frame memory 1
The pixel/image information in c is processed at high speed.For example, for the R memory, the dot position of the image part is turned on as shown in Figures 11 and 12A, and the lower part where the background color is red is turned on. The upper part where the background color is green is rewritten to OFF, and for G memory, the upper part where the dot position and background color of the image part form the border is rewritten to ON, and the background color is changed to red. The lower part is rewritten to OFF, and B
Regarding the memory, as shown in Fig. 12C, the dot position of the image part is set to ON, the background color becomes red and green, and the lower part is rewritten to OFF. This rewritten pixel/image information is output from the output I/F1
d is outputted to the display unit 2 as color-coded display information S _R out, S _G out, and S _B out, and is displayed in different colors by moving up and down and rotating, for example, with 30 to 100 updates per second.

<Problems to be Solved by the Invention> By the way, as described above, this conventional display information generation circuit
Because it is necessary to rewrite the pixel/image information in the frame memory 1c at high speed, it takes a long time to fill in the background color (painting process), which reduces the display speed on the display unit. It was hot.

The present invention has been made in view of the problems of the conventional technology, and provides a display information generation circuit that achieves high-speed display information by adding a hardware circuit that generates a background color. With the goal.

<Means for Solving the Problems> In order to achieve the above-mentioned object, the display information generation circuit of the present invention inputs an input signal to a symbol generator, generates color-coded display information, and then displays the information on the display section. In the display information generation circuit configured to display by color, the symbol generator includes a graphics controller, a pixel memory, and a surface memory, and generates the input from the pixel memory based on a control signal from the graphics controller. a frame memory that outputs image information of the signal and outputs the surface information of the input signal from the surface memory; and a frame memory that inputs the surface information and inputs a horizontal synchronization signal from the graphics controller to set the background color of the image information. a background color generation circuit that generates a signal that becomes the background color, and an arithmetic circuit that receives the image information and the signal that becomes the background color, and calculates and outputs display information for displaying in different colors on the display section. It is what it is.

<Examples> Examples of the present invention will be described in detail below based on the drawings. In addition, in the following drawings, figures 9 to 1
Parts that overlap with those in FIG. 2 are given the same numbers and their explanations will be omitted.

FIG. 1 is a block diagram of a display information generating circuit according to the present invention. Incidentally, in the present invention as well, a posture indicator is used as a specific example for explanation, similar to that used in the explanation of the prior art.

In FIG. 1, 10 is a symbol generator. This symbol generator 10 is
A graphics controller 1 includes an input I/F 10a to which an input signal i is input, a graphics controller 10b that controls drawing operations and display operations, and an RGB pixel memory and a surface memory F.
Based on the control signal from 0b, the image information based on the input signal i (signal S _R ,
S _G , S _B ), and a frame memory 10c that outputs surface information (signal S _F ) from the surface memory F;
The horizontal synchronization signal H _S is input as a reset signal from the graphics controller 10b, and the surface information signal S _{F is} input.
a background color _generation circuit 10e that generates background color information (signals _SSR , SS _G , _{SS B} ) that becomes the background _color of image information by inputting a trigger; Display information (signals SS _{R out , SS G}
out, SS _B out) and outputs it to the output I/F 10d. Here, background color generation circuit 1
0e is, for example, a T-F/F that inputs the horizontal synchronization signal H _S as a reset input and inputs the surface information signal S _F as a trigger.
(Flip-flop) 10e ₁ and T-F/F10
By inputting the Q output signal _Q of e ₁ , the background color setting value R ₁ (=
0)・G ₁ (=1)・B ₁ (=0) or R ₂ (=1)・G ₂
(=0)・B ₂ (=0) and select the background color information signal.
It consists of a selector _10e2 that generates SS _R , SS _G , and SS _B.

The operations and functions shown in FIG. 1 will be explained below with reference to FIGS. 2 to 5, which are used to explain FIG. 1.

The graphics controller 10b rewrites the pixels and images in the frame memory 10c during drawing, and reads out the rewritten data at regular intervals during display. This is a raster scan similar to the above, and a horizontal synchronizing signal H _S is output at the start of scanning in the horizontal direction.

When drawing an image on the display section 2 that is displayed in white, the graphics controller 10b changes the RGB pixel memory of the frame memory 10c into images such as those shown in FIGS. 2A to 2C based on the input signal i. Can be rewritten. The rewritten RGB pixel memory is then read out to the arithmetic circuit 10f at regular intervals during display.

On the other hand, the background color in which the upper part is displayed in green and the lower part is displayed in red is as shown in Figure 3 <>
As shown in , the surface memory F becomes surface information rewritten based on the input signal i by the graphics controller 10b (as shown by the arrow α, only the contents of the straight line portion indicating the “zero” portion are “1”).
(high level)”).

At the time of display, this surface information is transmitted to the graphics controller 10b as shown in FIG.
Therefore, a trigger is output to the TF/F 10a of the background color generation circuit 10 as a surface information signal S _F at a constant period.

In the T-F/F 10a, before being triggered by the surface information signal _SF , it is reset by the horizontal synchronizing signal H _S from the graphics controller 10b shown in FIG. As a result, T-
The F/F10a receives a signal _Q as shown in Fig. 3.
(a timing signal whose output is inverted due to scanning using the surface information signal _SF ) is guided to the selector _10e2 .

The selector 10e ₂ selects the background color setting values R ₁ , G ₁ , B ₁ or R ₂ , G ₂ , B ₂ based on the signal _Q , and generates a background color information signal with the content as shown in FIG. SS _R , SS _G , and SS _B are guided to the arithmetic circuit 10f (seeing only the background color in the display section 2, the third
(It will look like the figure <>).

In the arithmetic circuit 10f, the image information signals S _R ,
Display information signals SS _R out, SS _G out, SS _B based on the contents of S _G , S _B and background color information signals SS _R , SS _G , SS _B
out is output to the output I/F 10d. Output I/F
From 1d, color-coded display information S _R out, S _G out, and S _B out is output to the display section 2, and the color-coded display as shown in FIG. 3(vii) is performed by updating.

As described above, the background color can be easily obtained by drawing a straight line based on the input signal i in the surface memory F and processing the surface information independently in the background color generation circuit 10e. Therefore, with RGB memory, only image processing needs to be performed, compared to conventional methods where all processing of pixel/image rewriting, including RGB filling, is processed using a graphics controller/RGB memory. Since the update processing of display information is dramatically improved, high-speed update display becomes possible.

<Other Examples> By the way, the present invention is not limited to the configuration shown in FIG. 1 and the operation shown in FIGS. 2 and 3.

For example, it is also possible to do as follows.

:For example, the configuration and operation of the background color generation circuit when the background color is three or more colors are shown in Figures 4 to 5.
The figure may be similar to the figure for explaining other embodiments of the figure.

In FIG. 4, a shift register 100e ₁ is used instead of the T-F/F 10e ₁ , and at this time the selector 10
Depending on the desired multicolor background color, change the background color setting value of 0e ₂ to R ₁・G ₁・B ₁・R ₂・G ₂・B ₂ ,...,R _o・
G _o and B _o , and the background color information signals SS _R a, SS _G b, and SS _B c selected based on the register signal of the shift register 100e ₁ are obtained.

As shown in FIG. 5<>, the shift register _100e1 is reset with the horizontal synchronizing signal H _S and then shift-registered with the surface information signal S _F , and outputs a signal as shown in FIG. Output to the selector 100e ₂ , and from the selector 100e ₂ R ₁ , G ₁ , B ₁ → R ₂ , G ₂ , B ₂ as shown in FIG.
→..., R _o , G _o , and B _o are background color information signals SS _R a,
Multiple background colors can be obtained by directing the signals SS _G b and SS _B c to the arithmetic circuit 10f.

In FIG. 4, it goes without saying that the means for obtaining a plurality of selection signals is not limited to the combination of a shift register and a selector, but may also be configured, for example, by a combination of a counter and a selector. Nor.

: Also, although the image is displayed as white in FIG. 1, it is not limited to this. In this case, if the arithmetic circuit is configured with three OR circuits, as shown in the diagram for explaining other embodiments in FIG. 6, for example, when the background color is red and the image is to be displayed in green, If you simply turn on S _R as shown in Figure 6A and turn on SS _B for the image part as shown in Figure 6B, the image part will be displayed in magenta as shown in Figure 6C. Put it away.

Therefore, in order to avoid such a problem, it is conceivable to configure the arithmetic circuit 100f as shown in the diagram for explaining another embodiment of FIG. 7.

The idea in Fig. 7 is that the image part is
Since all that is required is to be able to display an image of the desired color (in this case, green against the red background color) regardless of the type of background color, as a simple concept, the other implementations shown in Figure 8 can be used. As shown in the diagram for explaining the example in Figure 7, the background color at the position of the image information is removed (not output).
(Another conceivable configuration is to make the composite color the color of the target image, but a description of this will be omitted.)

In FIG. 7, the arithmetic circuit 100f includes a NOR circuit that receives image information signals S _R , S _G , and S _B as input;
Three AND circuits each have the output of this NOR circuit as their respective inputs on one side, and the background color information signals SS _R , SS _G , and SS _B on the other side.
It consists of three OR circuits that input the outputs SS _R0 , SS _G0 , SS _B0 of the AND circuit and image information signals S _R , S _G , S _B , respectively. Display information signal SSS _R out, SSS _G
out, SSS _B out is output to the output I/F 10d.

As a result of this configuration, when the background color is red (SS _R =ON) as shown in Fig. 8A, the image information signal S _B turns ON (high level) as shown in Fig. 8B. At the time, the output of the NOR circuit is
It becomes OFF (low level) and the output of the AND circuit
SS _R0 , SS _G0 , and SS _B0 are all turned OFF (low level), and the background color of the image information portion is removed as shown in FIG. 8C. As a result, the display section 2 can display the background color in red and the image in green, as shown in FIG. 8D.

Of course, this combination of colors is free, and it goes without saying that the image can be made white in this circuit.

:The present invention is not limited to use as an attitude indicator, but can be similarly applied to anything having a similar configuration.

<Effects of the Invention> As described above in detail with reference to the embodiments, the display information generation circuit of the present invention allows the frame memory to be used with the drawing function of the graphics controller by adding a simple circuit. Since there is no need to fill in the background color within the screen, the process of updating display information is dramatically improved (speeding up).
However, the display speed on the display section increases. Furthermore, the drawing function of the graphics controller can also be reduced.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a display information generating circuit according to the present invention, FIGS. 2 to 5 are diagrams for explaining FIG. 1, and FIGS. 6 to 8 are for explaining other embodiments of the present invention. FIG. 9 is a block diagram of a conventional display information generating circuit for an attitude indicator, and FIGS. 10 to 12 are diagrams for explaining the conventional technology. 1, 10...Symbol generator, 2...Display section, 10a...Input I/F, 10b...Graphics controller, 10c...Frame memory, 1
0e, 100e...Background color generation circuit, 10f, 10
0f...Arithmetic circuit.

Claims (1)

[Claims] 1. In a display information generation circuit configured to input an input signal to a symbol generator, generate color-coded display information, and then display the color-coded information on a display section, the symbol generator includes a graphics controller, a pixel memory, and a pixel memory. a frame memory having a frame memory, which outputs image information of the input signal from the pixel memory based on a control signal from the graphics controller, and outputs plane information of the input signal from the plane memory; a background color generation circuit which inputs information and also inputs a horizontal synchronization signal from the graphics controller to generate a signal that becomes the background color of the image information; 1. A display information generation circuit comprising: a calculation circuit that calculates and outputs display information for color-specific display on a display unit.