JPS60232597A - 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 Application of the Invention] The present invention relates to a display device, and particularly to a graphic display device suitable for use as a terminal device for graphic and graphics processing.

[Background of the invention]

Conventional graphics display devices typically include a refresh memory that stores the digital pixel pattern to be displayed. However, since only one set of refresh memories exists for each display, the digital pixel pattern that can be displayed on the display is limited to the only refresh memory corresponding to this display. Therefore, there is a drawback that only one digital pixel signal pattern can be displayed on the first display at the same time.

[Purpose of the invention]

An object of the present invention is to provide a display device that can simultaneously display a plurality of different screen information on a display.

[Summary of the invention]

The present invention provides a first refresh memory that stores data indicating, for example, a first digital pixel signal pattern to be displayed in an overlay and an overlay display range, and a second refresh memory that stores, for example, a second digital pixel signal pattern to be displayed in an overlay. a refresh memory, and a detection means such as a decoder for detecting data indicating an overlay display range;
First refresh memory or? The present invention is realized in a graphic display device having one stage of selectors for selecting the outputs of the 42 refresh memories based on the outputs of the detection means, and a display section for displaying the outputs of any of the selected refresh memories.

In such a configuration, the selection means selects the output of the first freshé memory in the initial state, and this output is displayed on the display section. However, when the detecting means detects data indicating an overlay range among the outputs of the first Nori Freshé memory, the selecting means selects the output of the second Nori Freshé memory.

Therefore, in this overlay range, the output of the second freshé memory is displayed on the display section. Of course, if it falls outside of this range, the detection means will detect this, and the output of the first freshé memory will be selected again by the selection means.

This makes it possible to overlay the contents of the first glue freshening memory and the second glue freshening memory.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIGS. 1 to 4. FIG. 1 is a diagram showing the overall configuration of a graphic display device. The control processor 1 has a function of selecting and determining a figure to be displayed through program processing. The figure to be displayed is specified by the operator via the input device filf, for example. Note that although the input device is not particularly shown, it can be assumed that it is connected to the bus 4. The graphic data file 2 stores one piece of graphic data that can be displayed. The control processor 1 manages the reading of graphic data from the graphic data file 2 and the writing thereof. Writing and reading of graphic data to and from the graphic data file 2 is performed through the bus 4. The graphic raster expansion device 3 controls writing into the refresh memory 8 and the auxiliary refresh memory 9. The graphic raster development device f3 converts the graphic data transferred through the bus 4 into a corresponding digital image %4th pattern. This converted digital pixel signal pattern is transmitted via the data line 5 and the data line 6, and the addresses for the refresh memory 8, auxiliary refresh memory 8, and auxiliary refresh memory 9 are set by the graphic raster development device 3 via the address line 7. be done.

Note that the refresh memory 8 and the auxiliary refresh memory 9 each include a plurality of n screens (brains).

Among these, designation of which screen is permitted to write is performed as follows. That is, for refresh memory 8, refresh memory write brain designation register 1
3, and the auxiliary refresh memory 9 is designated by the auxiliary refresh memory write brain designation register 14. The contents of these two registers are set by the graphic raster expansion device 3. The refresh memory output selection device 10 selects either the output of the refresh memory 8 or the output of the auxiliary refresh memory 9 based on the contents of the refresh memory 8.

Details of the refresh memory output selection device 1o and its surroundings are shown in FIG. In this figure, a decoder 20 receives a signal 26 similar to the output 25 of the refresh memory 8 and detects a specific pattern from the refresh memory 8. The output of the decoder 2o is input to a flip-flop 21, and the output of the decoder 20 memorizes whether the specific pattern has been detected an even number of times or an odd number of times. The following three types of gates 22, 23, and 24 are connected to the output 2 of the refresh memory 8 depending on the state of the flip-flop 21.
5 and the output 27 of the auxiliary refresh memory 9 are selected.

D/A converter 1 converts the output of refresh memory 8 or auxiliary refresh memory 9 into an analog pixel signal. The display 12 displays graphics corresponding to the analog pixel signals.

Now, assume that, for example, the following information is given by the operator via the input device. That is, (1) Graphic data belonging to the screen to be overlaid.

(2) Graphic data belonging to the screen to be overlaid.

(3) Range on display to be overlaid.

(2) is the ID of the graphic data belonging to each screen (
identifier). (3) is specified by the coordinates of two points on the display. The overlay range is a rectangle whose diagonal is the line segment connecting these two points.

Each unit of graphic data in the graphic data file 2 has a unique ID9. This represents a unit for graphic data file management and display. Figures within the same ID cannot be operated separately. In other words, if a square and a circle are specified with the same ID, it is not possible to brighten only the circle (increase the brightness) or erase only the square.

FIG. 3 shows the structure of graphic data in the graphic data file. In the graphic data file 2, a plurality of units of graphic data are stored, with each unit 15 of graphic data having such a configuration. The graphic data 15 has a graphic data ID 16 at the beginning thereof.

The graphic data ID 16 also serves as a graphic data delimiter in the graphic data file 2. This figure data ID1
Following 6, refresh memory brain specification word 17
has. Refresh memory brain specification word 17
indicates the brane number of the fresh memory that is writable when the graphic data 15 is written to the refresh memory 8. In this embodiment, which has n brains, the refresh memory brain designation word 17 indicates that if the lower n bits are valid and the bit-th (1<k<rl) power fゝ1'', write to the k-th brain. Show what to do.

In the example in Figure 3, the 1st and 3rd bit power>a%
1", and all others are 10", indicating that the graphic data should be written only to the 1st and 3rd planes. This refresh memory brain specification word 1
Following 7, an auxiliary refresh memory brain designation word 18 is provided. The auxiliary refresh memory brain designation word 18 is a graphic data card? Indicates a writable brain number when writing to the auxiliary fresh memory 9. Its bit configuration is the same as that of the refresh memory brain designation word 17 described above. The remaining part of the figure data is line segment data 19, which indicates the coordinate values of the start and end points of each line segment making up the figure.

FIG. 4 is a diagram showing an example of display according to this embodiment.

For example, consider a case where a drawing 33 in which the overall image of a rat and its skeleton are overlaid is to be displayed. Of course, it is assumed that the graphic data file 2 stores these graphic data files f. In this case, the graphic data ID of the mouse's entire image 30, the graphic data ID of the mouse's skeleton 31, and the force f of two vertices forming diagonal corners of the range 32 where overlay display is performed are performed using the input device.

In FIG. 1, the control processor 1 selects the corresponding graphic data from the graphic data file 2 based on the graphic data ID of the entire mouse image, clears the auxiliary refresh memory brain designation word to zero, and clears the auxiliary refresh memory brain designation word to the graphic raster expansion device. Transfer to 3. Since this graphic data is for refresh memory writing (a graphic to be overlaid), the auxiliary refresh path memory brain designation word is cleared so that it is not written to the auxiliary refresh memory 9.

The graphic raster expansion device 3 ignores the first graphic data ID of the graphic data and sets the subsequent refresh memory plane designation word 17 in the register 13. Subsequently, the auxiliary refresh memory brain designation word 1B is set in the register 14. Finally, a dot array that approximates the line segment is generated from the coordinate values of the start and end points of the line segment data. There are many methods of line segment approximation such as DDA and Bresenham.
This method is known in the art and can be carried out, for example, according to these methods. The address of the generated dot row is applied to refresh memory 8 and auxiliary refresh memory 9 through address line 7, and dot data is applied to refresh memory 8 and auxiliary refresh memory 9 through data lines 5 and 6. Refresh memory writing is permitted by the brane designation register 13, and digital pixel signals are stored in the refresh memory brane.

Next, the control processor 1 selects the corresponding graphic data from the graphic data file 2 based on the graphic data ID of the mouse bone and the case, clears the refresh memory brain designation word 17 to zero, and executes the graphic raster expansion device @
Transfer to 3. Similarly, the digital pixel signal strength is also stored in the brain of the auxiliary refresh memory 9.

Finally, the control processor l creates graphic data having two vertical line segments of the rectangle given as the overlay range condition as line segment data. The auxiliary refresh memory brain designation word 18 of this graphic data is determined to be 10'', and the refresh memory brain designation words are all determined to be 11'' (FFFF). this(
FFFP) is a specific pattern detected by the decoder 20.

Such graphic data is transferred to the graphic raster developing device 3, and two line segments 321 and 322 indicating the entire mouse image and the overlay range are stored on the refresh memory 8.

The display operation will be described below with the digital pixel signal input stored in the refresh memory 8 and the auxiliary refresh memory 9 in FIG. 2 as described above. The refresh memory 8 and the auxiliary refresh memory 9 are scanned in synchronization, from the upper left corner to the upper left corner, and then from the left corner to the right corner along a line one dot lower, just like a television scan. In the initial state, the flip-flop 21 is in a reset state. Therefore, the output 27 of the auxiliary refresh memory is disabled by the AND gate 23, and the D/A converter IIK outputs the upper end of the left line segment 321 of the two vertical line segments stored in the refresh memory 8. When scanned, the output 25 of the refresh memory becomes a specific pattern (FFFF). Therefore, the decoder 20 detects this specific pattern and inverts the flip-flop 21.

Therefore, the output 25 of the refresh memory is disabled by the ANI) gate 23, and the output 27 of the auxiliary refresh memory is input to the D/A converter 11. This state continues until the upper end of the right line segment 322 of the two vertical line segments stored on the refresh memory 8 is scanned. Therefore, by this scanning, the first
The output 25 of the refresh memory 8 is displayed from the first line segment 321 to the second line segment 322, and the output 27 of the auxiliary refresh memory 9 is displayed from the first line segment 321 to the second line segment 322.
From the line segment 322 of m2 to the right corner, the output 25 of the refresh memory 8 is again displayed. By repeating these operations, the entire screen displayed on the display 12 will look like the screen 33 in FIG. The output is

According to this embodiment, since most of the overlay processing is implemented in hardware, rapid processing is possible.

〔Effect of the invention〕

According to the present invention, the contents of the first refresh memory and the second refresh memory can be selected and displayed using the addresses on the display screen, so that a plurality of screens can be displayed simultaneously in an overlapping manner.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the overall configuration of a display device according to an embodiment, FIG. 2 is a block diagram showing details of a refresh memory output selection device and its surroundings, and FIG. m3 is a diagram showing the configuration of graphic data. FIG. 4 is a diagram showing an example of development and display of graphic patterns on the beam fresh memory. 8...Refresh memory 9...Auxiliary refresh memory 10...Memory output selection device 20...Decoder 21...Flip-flop, / fffi Fig. 2

Claims (1)

[Claims] (In a display device that converts a digital pixel signal pattern into an analog signal and displays it on a clothing part, storing the first digital pixel signal pattern and material data indicating the range of overlay display. a second memory storing a second digital pixel signal pattern;
a refresh memory, a detection means for detecting cough specific data, and a selection means for selecting either the output of the first refresh memory or the output of the second refresh memory according to the detection result of the detection means. 1. A display device comprising: an output of the second refresh memory is selected within an overlay display range, and an output of the first refresh memory is selected outside of this range.