JPS627084A - Image 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 [Industrial Application Field] The present invention relates to a display device for an electronic circuit device, and is applied to a control circuit that displays information on display characters and display graphics on a screen.

〔overview〕

The present invention provides an image display device that controls character information and graphic information independently and displays them on the same screen, by switching and controlling the output gates of each of the character information and graphic information by outputting priority display information. , it is possible to prioritize the display of necessary information, either text or graphics.

[Conventional technology]

In conventional image display devices, when displaying text information for display and graphic information for display on one screen, control is performed such as displaying both information at the same time or giving priority to displaying the text information. was.

[Problem that the invention seeks to solve]

Recent improvements in man-machine interfaces have enabled multi-window display, but if you try to prioritize display of text information or graphic information in units of arbitrary rectangular areas, the overlapping parts will be temporarily displayed externally. It is necessary to save the data to a storage device, which has the disadvantage of complicating processing and reducing performance.

SUMMARY OF THE INVENTION An object of the present invention is to solve this drawback and provide an image display device that can freely and instantaneously select and display necessary information on a character-by-character or pixel-by-pixel basis.

[Means for solving problems]

The image display device of the present invention has means for storing character information for display and means for storing graphic information for display, and displays either the character information or the graphic information with priority for each display character or display pixel. The present invention is characterized in that it has a means for storing information on whether to display information, and a means for preferentially displaying information specified by display order priority information read out from the storing means.

That is, the present invention provides an image display device comprising a display character information storage circuit, a display graphic information storage circuit, and means for switching the output information of the two storage circuits and displaying the same on a display drawing. The displaying means includes a priority display information storage circuit that stores selection information for preferentially displaying the output of one of the two storage circuits, and a selection switch based on the output of the priority display information storage circuit. It is characterized by being equipped with a circuit.

[For production]

An AND gate is provided on the output side of the circuit for storing display character information and display graphic information, respectively, relative to the image display device, and one of the circuits for storing display order priority information provided separately is connected to one side. Send only priority information,
The display order of text information and graphic information can be freely controlled by inputting the output to the corresponding AND gate, and inputting the output obtained by inverting the above-mentioned one priority information output using an inverter to the other AND gate.

〔Example〕

An embodiment of the present invention will be described with reference to the drawings.

The figure shows a block diagram of an embodiment of the present invention.

It consists of a character information storage circuit 1, a graphic information storage circuit 2, a parallel-to-serial conversion circuit 4 to which the outputs of the character information storage circuit 1 are input, and a parallel-to-serial conversion circuit 5 to which the output of the graphic information storage circuit 2 is input. , the data read from each memory circuit is converted into serial data.

The feature of the present invention is that it is equipped with a priority display information storage circuit 3 that stores priority information of display order, and the output of the parallel-to-serial conversion circuit 4 is inputted to one side of the AND gate 11 and inputted to the other input. The output of the priority display information storage circuit 3 is inputted, and the output of the parallel-serial conversion circuit 5 is inputted to one side of the AND gate 12, and the output of the priority display information storage circuit 5 is inverted by the inverter 10 to the other input. The output is the input.

The outputs of AND gate 11 and AND gate 12 are respectively connected to the input of OR gate 13, and the output of OR gate 13 is the display data signal, v! 101 and is input to the image display device 6.

Now, when the output of the priority display information storage circuit 3 is "1",
The output of AND gate 11 is parallel to serial converter circuit 4
The output of the AND gate 2 is output as is, but since the output of the AND gate 2 becomes rOJ, the output of the OR 113 is also the output of the parallel-to-serial conversion circuit 4, and character information is output to the display data signal line 101. be done. On the other hand, when the output of the priority display information storage circuit 3 is rOJ, the output of the AND gate 11 is rOJ, and the output of the AND gate 12 is the same as the output of the parallel-serial conversion circuit 5, so the output of the OR gate 13 is On the other hand, the output of the parallel-to-serial conversion circuit 5 is also output, and the display data signal line 101
Graphic information is output.

In order to switch the priority display on a character-by-character basis, priority display information is written on a character-by-character basis in the priority display information storage circuit 3, and is executed by reading the priority display information on a character-by-character basis when displaying is executed. Similarly, priority display can be switched in display pixel units.

If it is desired to change the priority display, by rewriting the priority display information storage circuit 3, the information to be displayed preferentially can be instantly switched character by character or display pixel by display pixel.

〔Effect of the invention〕

As explained above, according to the present invention, when one of text information and graphic information is being displayed with priority and the other is changed to be displayed with priority, it is possible to easily change the display on a character-by-character or display-pixel basis. By adding a circuit, it has the effect of allowing free and instantaneous execution.

[Brief explanation of drawings]

The figure is a block diagram showing one embodiment of the present invention. 1...Character information storage circuit, 2...Graphic information storage circuit, 3...Priority display information storage circuit, 4.5...Parallel-serial conversion circuit, 6...Image display device, 1o...
・Inverter, 11.12...And gate, 13.
...OR gate, 101...Display data signal line.

Claims (1)

[Claims] (1) In an image display device equipped with a display character information storage circuit, a display graphic information storage circuit, and a means for switching the output information of the two storage circuits and displaying the same on a display drawing, the above-mentioned switching and displaying is performed. The means includes a priority display information storage circuit that stores selection information for preferentially displaying the output of one of the two storage circuits, and a circuit that performs selection switching based on the output of the priority display information storage circuit. An image display device comprising: