JPS61159689A - Crt display unit - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to a CRT display device Fk:IIL, in particular, a frame memory that stores multiple bits of pixel data, and sequentially outputs the 1i pixel data using a raster scan method. The present invention relates to a CRT display device that displays two-dimensional or three-dimensional images on a CRT screen.

SUMMARY OF THE INVENTION The present invention is a rusk scan type CRT display device that converts coordinates in the depth direction of a three-dimensional figure into colors, brightness, etc., and visually draws and draws the figure as a three-dimensional figure.

BACKGROUND OF THE INVENTION FIG. 4 is a block diagram of a conventional CRT display V4. First, a conventional CRT display device will be briefly described with reference to FIG.

Data is provided from the host computer 1 to the display processor 3 via the communication control circuit 2. Display processor 3 registers data transmitted from host computer 1. Associated with the display processor 3 is a keyboard 5, a program ROM 6 and a data RAM 7.

The keyboard 5 is used to give commands to display arbitrary data among the data registered in the display processor 3. The program ROM 6 stores programs necessary for the display setter 3 to operate.

The data RAM 7 stores commands and data for display. The data registered in the display processor 3 is given to a high speed W4 arithmetic circuit 4 for coordinate conversion.

The coordinate conversion high-speed calculation circuit 4 receives display data (X, V) output from the display processor 3.

When enlarging, reducing, rotating, or translating 2), the data is multiplied by the necessary matrix to create new data (x=, y-).

2=). The data output from this high-speed calculation circuit for coordinate transformation 4 is given to a clip circuit 8. When a part of a figure on a CRT' display screen is surrounded by a frame, a clipping circuit 8 clips the figure that protrudes from the frame.

The output of the clipping circuit 8 is given to a filling circuit 9 and a straight line generating circuit 10. When filling in a figure, the filling circuit 9 generates line segments by decomposing the coordinates of the origin given by the clipping cycle W87 into inner lines, thereby obtaining filling data. In addition, the straight line generation circuit 10 calculates intermediate coordinates in a vector connecting the start point and end point based on the coordinate data of the start point and end point output from the clip circuit 8, and stores the calculation results in the frame memory 12. Let n be a straight line.

The frame memory 12 stores multiple bits of information 1! for each of the multiple bits of each pixel displayed on the CRT screen. Has an area. This Wll number bit storage area for each pixel stores color information and brightness information for each pixel.

The data of each pixel stored in the frame memory 12 is given to the monitor interface 13. The monitor interface 13 reads out the pixel data on the frame memory 12 and supplies it to the color monitor 14 along with a synchronizing signal.

Color monitor 14 displays graphics based on data read from frame memory 12.

Problems to be Solved by the Invention FIGS. 5 and 6 are diagrams showing an example of a three-dimensional figure displayed on a conventional CRT display device. Particularly, FIG. 5 shows a parallel projection state; FIG. 6 shows a perspective projection state.

In the CRT display device described above, the first axis (
Not only a two-dimensional figure represented by the x axis) and the second ring (y axis) perpendicular to the first axis, but also a third axis (the y axis) perpendicular to each of the first and second axes. Three-dimensional figures represented by axes can also be displayed. Examples of methods for displaying such three-dimensional figures include parallel projection as shown in Figure 5, and a more human-like image as shown in the fse diagram. J2
``There are cases where perspective projection is used to display something close to gM.When drawing a three-dimensional figure by parallel projection, only the data of the X and y coordinates are used.
Two-coordinate data is not used effectively.

On the other hand, in the case of perspective projection, it is necessary to perform matrix calculation for perspective projection on each coordinate data of x, y, and z, and this calculation process becomes extremely complicated.

Therefore, the main purpose of this invention is to improve the depth direction of three-dimensional figures! ! Based on the search data, the color and brightness in the depth direction are changed to visually display the input shape in three different ways.
An object of the present invention is to provide a CRT display device capable of displaying dimensional figures.

Means for Solving the Problems The present invention provides image storage means for storing a plurality of pixel data on a two-dimensional plane in the first and second axis directions, and image storage means for storing a plurality of pixel data on a two-dimensional plane in the first and second axis directions, a writing means for writing multiple bits of pixel data into a storage area of the image storage means corresponding to coordinate data of a two-dimensional figure represented by , and converting the pixel data read from the image means into data such as color, brightness, etc. In a CRT display device equipped with a display means for displaying on a CR,T display screen, based on the third axial coordinate value of the three-dimensional figure data,
As the coordinate value moves away from the first and second axes,
and means for setting pixel data in an image storage means so as to sequentially change color, brightness, etc.

Function: In this invention, three-dimensional graphic data is displayed so that its color and brightness change in the back third axis direction, that is, in the depth direction, so that the data is visually drawn as a three-dimensional graphic.

Embodiment FIG. 1 is a block diagram of an embodiment of the present invention. The embodiment shown in FIG. 1 is one in which a seven-line generation circuit 15 is newly provided in addition to the x, y line generation circuit 10 shown in FIG. is the same as This Z straight line generating circuit 15 interpolates seven coordinates based on the z9 target values of the starting point and ending point of the straight line in synchronization with the x,y straight line generating circuit 10.

FIGS. 2 and 3 are diagrams for explaining the specific operation of an embodiment of the present invention.

Next, with reference to FIGS. 1 to 3, a specific operation of an embodiment of the present invention will be described.

First, a straight line with starting point A and ending point B as shown in Figure 2, that is, a straight line with x, y, z coordinate values <100.100°10) as the starting point and (300, 300, 60> as the ending point) When given, the x, 2 straight line generating circuit 10 interpolates between the x, y coordinate values (100, 100) to (300, 300>).On the other hand, the 2 straight line generating circuit 15 interpolates between the x, y coordinate values (100, 100) and (300, 300>). 10, interpolation is performed between two coordinates 10 and 60.

Thereby, the address of frame memory 12 <100
．． From 100> to (300, 300>, the interpolated 2
The coordinate values 10 to 60 are written as data.

The data written to the frame memory 12 from this two-line generation circuit 15 is the two-seat f! The code is set such that the color or brightness becomes darker as the value moves away from the X and y axes. And frame memory 1
The data written in 2 is read out and given to monitor interface 13. The monitor interface 13 changes the color signal component or luminance signal component included in the video signal output to the color monitor 14 according to the data read out from the frame memory 12.

Therefore, the straight line projected on the CR7 screen is
As shown in the figure, as it moves from starting point A to ending point B, it becomes a straight line whose brightness changes continuously from bright to dark, and as it visually moves from point A to point 8, the two coordinates become larger. It appears as a straight line. By using such straight lines to display the three-dimensional figures shown in FIG. 5 or FIG. 6, a more three-dimensional display effect can be obtained.

Effects of the Invention As described above, according to the present invention, based on the coordinate value in the third axis direction of the three-dimensional figure data, the color changes as the coordinate value moves away from the first and second axes. Since the image data stored in the image storage means is set so that the brightness etc. are changed sequentially, CRTIi! Since the color and brightness of the three-dimensional figure displayed on the screen ii change in the depth direction, it can be visually displayed as a three-dimensional figure.

[Brief explanation of drawings]

FIG. 1 is a block diagram of one embodiment of the present invention. Second
3 and 3 are diagrams for explaining the operation of an embodiment of the present invention. FIG. 4 is a block diagram of a conventional CRT display device. Figures 5 and 6 are conventional C
FIG. 5 is a diagram showing an example of a three-dimensional figure displayed on an RT display device, and in particular, FIG. 5 shows a parallel projection state;
FIG. 6 shows a perspective projection state. In the figure, 4 is a high-speed calculation circuit for coordinate conversion, 8 is a clip circuit, 9 is a fill circuit, 10 is a ×V line generation circuit, 12 is a frame memory, 13 is a monitor interface, 14 is a color monitor, and 15 is a Z line generation circuit. Shows the circuit. No. 31!1

Claims (1)

[Scope of Claims] Image storage means for storing a plurality of pixel data for each pixel on a two-dimensional CRT screen represented by a first axis and a second axis orthogonal to the first axis; of the two-dimensional figure represented by the first and second axes among the three-dimensional figure data expressed by the first and second axes and a third axis perpendicular to the first and second axes; writing means for writing a plurality of bits of pixel data into a storage area of the image storage means corresponding to the coordinate data; and a CRT display for converting the pixel data read from the image storage means into data such as color and brightness. A CRT display device comprising a display control means for displaying on a screen, the coordinate values of which are determined based on the coordinate values of the third axis among the three-dimensional figure data. A CRT display device, comprising means for setting pixel data stored in the image storage means so that color, brightness, etc. change sequentially as the distance from the image storage means increases.