JPS61175676A - Image display circuit - 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 the Invention The present invention relates to an image display device that simultaneously displays both binary data and multivalued data.

2. Description of the Related Art In conventional image display devices, when displaying a mixture of multi-value data and binary data on one screen as shown in FIG.
There is one that uses a circuit configuration as shown in the figure.

This circuit has separate display memories 18 and 20 for multi-value data and binary data, and when displaying multi-value data, it is converted into analog values by a D/A converter 19, and binary data is converted into analog values by a brightness level converter 21. to adjust the brightness level to an appropriate level. After this processing, the sum of both analog values is added to the adding means 2.
2 and output from the output terminal 23 as a video signal.

Problems to be Solved by the Invention However, in such conventional circuits, multi-value data,
The circuit configuration was complicated because it was necessary to have a separate display memory for each binary data, and after converting the multi-value data into analog values, it was necessary to calculate the sum with the binary data.

The present invention solves the above-mentioned conventional problems, and aims to provide an image device that has a simple configuration and can simultaneously display binary data and multivalued data.

Means to solve the problem There are digitized binary data and multi-value data as display data, and display memory to store the multi-value data or binary data to be displayed, and converting the display data into analog values. a D/A converter for displaying the multi-value data; An area for displaying binary data on the screen includes a synthesizing means for selecting binary data and synthesizing multivalued data from the selected binary data, and externally manipulating the value of the multivalued data to be synthesized by the synthesizing means. and means for storing the synthesized multivalued data in a corresponding area of the display memory.

Function The present invention can simultaneously display binary data and multivalued data with the above-described configuration.

Embodiment FIG. 1 is a block diagram showing an embodiment of the image display device of the present invention. In Figure 1, 1 is external multivalued data, 2 is a data bus through which the data to be displayed passes,
In this embodiment, since the multilevel data has 8 gradation bits, the data bus has 8 data lines. 3 is a data display memory in which data to be displayed is stored; 4 is a data bus through which display data output from the data display memory 3 passes; 5 is a D/D converter for converting the data passing through the data bus 4 from digital values to analog values. A converter, 6 is a display pig output control signal generation circuit converted into an analog value, 9 is a signal for controlling whether or not to output multivalued data, 1
o is a signal that controls whether or not to output binary data; 11 is a data line through which binary data coming from external binary data 7 passes;
12 connects the data line 11 through which the input binary data passes to one of the eight data lines on the output side, and sets the other outputs to LowO values in digital values 2
The value data/multivalue data conversion circuit 13 is a binary data (bus) consisting of 8 data lines, at least one of which has 8 data lines, and is connected to the data line 11 through which binary data passes. , 14 is a binary data/multivalue data conversion circuit that operates how many data lines of the eight output data lines 13 the input data line 11 of the binary data/multivalue data conversion circuit 12 can be connected to. Control signal 15 is a CPU that operates the binary data/multivalue data conversion circuit control signal.

Next, the operation will be explained.

First, it is necessary to store binary data and multivalued data to be displayed on the display 6 in the data display memory 3. By setting the signal 9, which controls whether or not to output multi-value data output from the binary data output control signal generation circuit 8, to output multi-value data, multi-value data 1 can be converted from multi-value data 1 to Multivalued data is output, sent to the data bus 2, and stored in the data display memory 3.

Next, when storing binary data in the data display memory 3, the signal 1o for controlling whether or not to output binary data output from the multi-value data/binary data output control signal generation circuit 8 is By setting it to output value data,
The binary data from the binary data 7 is output to the data line 11 through which the binary data passes. The binary data that has entered the binary data/multi-value data conversion circuit 12 is connected to at least one of the eight data lines on the output side, but the number of data lines to be connected is Data conversion circuit control signal 1
This binary data/multi-value data conversion circuit control signal 14 is operated by PUl 5. Further, in this binary data/multi-value data conversion circuit 12, the output data lines are outputted as low O values in digital values. As mentioned above, the binary data that passes through one data line output from the binary data 7 is
After passing through the binary data/multi-value data conversion circuit 12, it becomes a binary data bus with the same number of data lines as the 8 data lines of the multi-value data, and the binary data becomes a pseudo multi-value data bus. It will be converted into value data and stored in the data display memory 3. Therefore, the data display memory 3 can store binary data and multivalued data in a mixed form.

Next, the display data written in the data display memory 3 is output to the data bus 4 and input to the D/A converter 5.

The display data input to the D/A converter 5 is converted from digital values to analog values and displayed on the display 6, where binary data and multi-value data are mixed and displayed on the screen.

Effects of the Invention As described above, according to the present invention, binary data and multivalue data can be displayed simultaneously with a simple circuit configuration.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an image display device according to an embodiment of the present invention, FIG. 2 is a display screen diagram showing a screen in which binary data and multi-value data are displayed together, and FIG. FIG. 1 is a block diagram showing a conventional image display device.

Claims (1)

[Claims] a display memory for storing display data having digitized binary data and multi-value data; a D/A converter for converting the display data into analog values; and a display display for displaying the analog values. In order to display a mixture of areas for displaying binary data and areas for displaying multi-value data on one display screen, multi-value data is selected for the area for displaying multi-value data on the display screen. , a means for storing in a corresponding area of the display memory, and a synthesizing means for selecting binary data in an area for displaying the binary data on the display screen and synthesizing multivalued data from the selected binary data. An image display device comprising: means for externally manipulating the value of the multivalued data to be synthesized in the synthesis means; and means for storing the synthesized multivalued data in a corresponding area of the display memory.