JPS62165278A - Picture display device - Google Patents

Abstract

PURPOSE:To attain the display of an optional hatching pattern by providing a control circuit which outputs the write signal of the hatching pattern to be stored from a logic circuit to a frame memory. CONSTITUTION:A control circuit 21 provided in a CPU2 gives a command signal 11 for the smear out of an optional area to a CRT controller 1 even when a hatching display is performed, and the CRT controller 1 outputs a frame memory write address signal 23 for a smear out display, and a smear out data signal 22. A logic circuit 6 forms a write data signal 26 to a frame memory 3 by taking a logical product between the smear out data signal 22 and display pattern data signals 24 and 25, and writes it on the frame memory 3. At such a time, an optional hatching pattern data is written on an X direction hatching pattern storage part 4 and a Y direction hatching pattern storage part 5. In this way, the optional hatching pattern can be displayed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an image display device that displays a hatching pattern on a display screen.

[Conventional technology]

A conventional device of this type is shown in FIG.

In the figure, 1 is a CRT controller that can only hatch in a specific area but can fill in any area, 2 is a central processing unit (hereinafter referred to as CPU) that controls the entire image display device, and 3 is a CRT controller that can hatch any area. 4 is a frame memory that stores the hatching pattern displayed on the display screen, and 4 is an X-direction notching node (
5 is a turn storage section, and 5 is a Y-direction/touching pattern storage section that can be freely read and written.

Next, the operation will be explained. Regarding the hatching function of the CRT controller 1, the CPU 2 uses the C
It is executed by giving the RT controller 1 (=command signal 11).For areas that are too large for the CRT controller 1, that is, arbitrary areas on the display screen, the CPU 2 stores the X-direction hatching pattern storage unit 4 and the Y-direction hatching pattern. Hatching pattern data signal 1 from memory 85
2 is read, hatching display pattern data is formed, and a command signal 11 is given to the CRT controller 1.
The T controller 1 decodes the command signal 11, outputs a hatching display pattern data signal 13, and stores it in the frame memory 3.

[Problem that the invention seeks to solve]

Since the conventional device was configured as described above, the hatching pattern display data had to be created by the CPU program, which placed a heavy burden on the CPU itself and caused problems such as it took a long time to display the screen. The present invention has been made to solve the above-mentioned problems, and aims to reduce the load on the CPU, reduce the execution time of hatching display, and display an arbitrary hatching pattern.

[Means for solving problems]

Therefore, the image display device according to this invention C2 includes a logic circuit that outputs the logical product of the signal from the controller and the signal from the X-direction and Y-direction hunting pattern storage section, and when notching an arbitrary area. , a control circuit that inputs a filling signal from the controller and signals from the X-direction and Y-direction hatching pattern storage units to the logic circuit, and outputs a write signal for the hatching pattern to be stored in the frame memory from the logic circuit; It is characterized by having the following.

[Effect]

The logic circuit according to the present invention outputs the logical sum of the signals from the X-direction and Y-direction hatching pattern storage sections and the filling signal from the CRT controller.

When hatching is to be performed on an arbitrary area on the display screen, the control circuit causes the logic circuit to output a signal for writing a hatching pattern to the frame memory.

〔Example〕

An embodiment of the present invention will be described below based on the drawings.

FIG. 1 is a configuration diagram showing an embodiment of the present invention. In the figure, 1 is a CRT controller that can use a filling function for any area in the screen display area, and 2 is a command signal 11 for the CRT controller 1. Switching between hatching display and filled display 1G CPU that outputs No. 21, 3
4 is a frame memory, 4 is an X-direction cutting pattern storage section that can be read and guided freely and has 6 cells for the total number of strokes in the X direction of the display area, 5 is a frame memory that can be freely read and guided, and 5 is a A Y-direction hatching pattern storage unit having a capacity for the total number of pixels in the Y-direction, 6 is a logic between the signal from the CRT controller a-ra 1 and the signal from the X-direction and Y-direction hatching pattern storage unit 4.5. A logic circuit 21 outputs a sum, and a logic circuit 21 inputs a filling signal from a CRT controller 1 provided in the CPUI and signals from an X-direction and a Y-direction hatching pattern storage section to a logic circuit 6, and outputs a frame from the logic circuit 6. This is a control circuit that outputs a hatching pattern display pattern written to the memory 3.

Next, the operation will be explained. First, a case will be described in which an arbitrary blank area is filled in. The display pattern signal 24 from the X-direction hatching pattern storage section 4 and the display from the Y-direction hatching pattern storage section 5 are controlled by the hatching display/filling display switching signal 21 from the control circuit 21 provided in the CPUZ. Pattern signal 25 is C
The write address signal 23 from the RT controller 1 to the frame memory 3 is always at a HIGH level, and the fill data signal 22 from the CRT controller 1 is directly written to the frame memory 3 as the write data signal 26. .

Next, we will discuss the case of hatching an arbitrary area. At this time, the display pattern signal 24 from the X-direction hatching pattern storage section 4 and the display pattern signal 25 from the Y-direction hatching pattern storage section 5 are stored in the respective storage sections 4 and 5 by the hatching display/filling display switching signal 21 from the CPU 2. The stored data is in a state where it is output by the frame memory write address signal 23 from the CRT controller 1. A control circuit 21 provided in the cptrz sends a command signal 1 to fill any area to the CRT controller 1 even when hatching is displayed.
1, and the CRT controller 1 outputs a frame memory:j write address signal 23 and a fill data signal 22 for fill-in display. The logic circuit 6 uses this fill data signal 22 and the display pattern data/signal 2.
4. Take the logical product of 25 (2) to form the write data signal 26 to the frame memory 3 and write it to the frame memory 3. At this time, the Write any hatching pattern data in the marking section 5 (
From 2, you can display arbitrary hatching.

In the above embodiment, the address signal 23 and data signal 22 for writing to the frame memory 3 are output from the CRT.
Although this is done using the controller 1, the address output and data output from the CP TJ 2 may also be used.

〔Effect of the invention〕

As described above, this invention is configured to use the fill function of the controller when hatching an arbitrary area using the OR circuit and the 'control circuit.
The burden on the user is reduced, the display time on the hatching display screen is shortened, and any hatching pattern can be displayed by freely writing it into the hatching pattern storage section.''
'4- There are some effects that can be done.

[Brief explanation of drawings]

FIG. 1 is a block diagram of an image display device according to an embodiment of the present invention, and FIG. 2 is a block diagram of a conventional image display device. 1...CRT unit) O-ra, 2...Central processing unit (
CPU), 3... Frame memory, 4... X direction hatching pattern storage section, 5... Y direction hatching pattern storage section, 6... Logic circuit.

Claims (2)

[Claims] (1) A hatch pattern is displayed for a specific area on the display screen based on the controller, and a hatch pattern for an arbitrary area on the display screen is stored in the X-direction hatch pattern storage unit and the Y-direction hatch pattern storage unit. In an image display device that generates a hatching pattern based on the hatching pattern in the X direction and the Y direction, writes it into a frame memory, and then displays it on the display screen, the signal from the controller and the hatching pattern storage unit in the X direction and Y direction are provided. When hatching an arbitrary area, input the filling signal from the controller and the signals from the X-direction and Y-direction hatching pattern storage sections to the logic circuit. and a control circuit that outputs a write signal for a hatching pattern to be stored in the frame memory from a logic circuit. (2) The X-direction and Y-direction hatching pattern storage section has a capacity equal to the total number of pixels in the X direction or the total number of pixels in the Y direction of the display area. image display device.