JPS6247098A - 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] [Technical Field] The present invention relates to a display device that displays an original image using dot-by-dot display data consisting of a bitmap, and in particular, to a display device that can easily realize various display modes with a simple circuit configuration. This is what I did.

[Prior art]

In conventional display devices of this type, in order to perform inversion processing and display, and furthermore, to restore and redisplay the inverted display contents, a central processing unit is installed in front of the display device and performs comprehensive processing of display data. Display data of a complicated configuration, which has been subjected to inversion processing and restoration and redisplay processing, respectively, is output to a display device and displayed.

Therefore, since it is necessary to process display data bit by bit on the central processing unit side, the load to be processed by the central processing unit increases significantly, resulting in a disadvantage that the display speed decreases. Another problem is that a complicated data processing program must be created in order to perform the above-mentioned display data processing.

〔the purpose〕

An object of the present invention is to eliminate the above-mentioned conventional drawbacks, and to enable each display mode of inversion processing and restored redisplay of display data to be easily processed and realized using a simple circuit configuration.
It is an object of the present invention to provide a display device that reduces the processing load on a central processing unit and eliminates the need to create a program that performs complicated bit-by-bit display data processing.

[Key points of the invention]

The display device of the present invention includes 1. Display data for each image dot made up of a conventional bitmap is combined with display control data made up of a bitmap of a simple configuration representing a desired display mode, and a control command code is added to identify and separate the data. When displaying such an input image signal, the input image signal can be easily processed using extremely simple logical operations on display data and display control data to realize image display in a desired display mode. This is what I did to get it.

〔Example〕

In the following, the invention will be described in detail by way of example embodiments with reference to the drawings.

First, an embodiment of the configuration of the display device of the present invention is shown in FIG.

In the figure, 1 is an interface control circuit of the display device,
Controls signal exchange work with the central processing unit. 2A is an input data register that temporarily stores input signals. 2B is a control command register, which controls separation and extraction of each component of the input signal according to a control command code in the input signal. 3A is a data register, which temporarily stores display data in an input signal. 3B is an address register that temporarily stores display control data in an input signal.

, Incidentally, in this embodiment, each register 2A, 3A.

The capacity of 3B is 16 bits wide, corresponding to the structure of display data and display control data for one dot, and the capacity of control command register 2B is 2 bits wide, corresponding to the structure of a control command code to be described later.

Reference numeral 4 denotes a memory control circuit, which controls the display data memory 5A for storing display data, the display control for storing display control data, and the writing and reading of data to and from the memory 5B. t3A is a display data register that temporarily stores display data for one display. 6B is a control data register that temporarily stores display control data during display. 7 is an exclusive OR (XOR) circuit which forms a logical product of display data and display control data for each dot. 9 is a display control circuit, which in this embodiment is a CRT.
The output display of the logical product of the display data and the display control data on the display 9 using the display unit 9 is controlled.

Next, the display operation in the display device of the present invention having such a configuration will be explained in detail. Image reading and
Among the input image signals having the above-mentioned configuration supplied from a conventional central processing unit to a recording/display system, display data, display control data, and control command codes are divided into an input data register 2A and a control command register 2B. save.

Further, the central processing unit notifies the interface control circuit 1 as a signal that input data has been written to each register 2A, 2B.

The 2-bit control command code written to the control command register 2B has the following meaning.

Upper bits: The contents of the input data register 2A are information regarding the display control memory 5B.

O: The contents of the input data register 2A are information regarding the display data memory 5A.

Lower bits: The contents of the input data register 2A are the data to be stored in the memory.

0: The contents of the input data register 2A are memory addresses.

Therefore, there are four types of control command code contents.

00...The contents of the input data register 2A are the memory addresses of the display data memory 5A.

01...The contents of the input data register 2A are data to be input into the display data memory 5A.

IO: The contents of the input data register 2A are the addresses of the display control memory 5B.

11... The contents of the input data register 2A are data to be input into the display control memory 5B.

The interface control circuit 1 transfers the contents of the input data register 2A to the address register 2B when the lower bit of the control command code mentioned above is 0, and transfers the contents of the input data register 2A to the address register 2B when the lower bit of the control command need is 1. Transfer to register 3A.

Furthermore, the interface control circuit l has each register 3A,
When each data is set in 3B, a signal to that effect is sent to the memory control circuit 4. Memory control circuit 4
manages data writing and reading into and from display data memory 5A and display control memory 5B while coordinating data output requests from display control circuit 8 and instructions from interface control circuit l.

That is, from the interface control circuit 1 to each register 3
When receiving a signal indicating that data has been set in A and 3B,
The memory control circuit stores data in either the display data memory 5A or the display control memory 5B according to the contents of the upper bits of the control command code and the contents of the address register 3B between data output requests from the display control circuit 8. Write the data of the contents of register 3A.

On the other hand, the display control circuit 8 requests the memory control circuit 4 for display data to be displayed on the CR7 display 9.

The memory control circuit 4 transfers the display data of the contents of the display data memory 5A to the display data register 6A and the display control data of the contents of the display control memory 5B to the display control register 6B in response to the request from the display control circuit. , are output every 16 bits.

Then, the contents of the registers 8A and 8B are output bit by bit to the XOR circuit 7 in response to a request from the display control port 1'. The XOR circuit 7 forms a bit-by-bit logical product of the data from the display data register 6A and the display control register 6B and outputs it to the display control circuit 8.The 0 display control circuit 8 outputs the logical product data to the CR7 display 9. Output and display as described below.

An example of the relationship between the display data of the contents of the display data memory 5A, the display control data of the contents of the display control memory 5B, and the display mode of the CR7 display 9 in the above-described display operation of the display device of the present invention will be simplified below. Figure 2 (A) ~
Shown in (I).

Among FIGS. 2(A) to (I), FIG. 2(H) displays the letter "A" inverted in the upper left corner of the display surface of the CR7 display 9 as shown in FIG. 2(G), and The number “3” is shown in the same figure (I
) shows an example of full density black and white display.

On the other hand, FIG. 2 (B) shows the contents of the display control memory 5B corresponding to the display contents of the CR7 display 9 shown in FIG. The half part is a display area in full-density black-and-white mode. Furthermore, (A) of the same figure shows the inversion mode display control data of the contents of the upper half of the same figure (B) in bit correspondence, and CG) of the same figure shows the contents of the lower half of the same figure (B). Full-density monochrome mode display control data is shown in bit correspondence.

In addition, FIG. 2(E) shows the contents of the display data memory 5A corresponding to the display contents of the CR7 display 9 shown in FIG. Each character pattern is shown below.

Furthermore, the letter rA in the upper half of the same figure (E) is shown in the same figure (CD).
(F) shows the number "3" in the lower half of (E) in bit correspondence.

Therefore, in FIG. 2(G), the data of the contents of the display control memory 5B shown in FIG. 2(A) and the data of the contents of the data memory 5A shown in FIG. The bit map of the character rAJ in halftone display as a result of the sum processing is shown, and the display contents in the upper half of FIG. In addition, the same figure (I) is the same figure (C
) and the data of the contents of the display control memory 5B shown in C.
The bitmap of the number "3" in full-density black-and-white display is shown as a result of exclusive ORing every two beats with the data of the contents of the display data memory 5A shown in FIG. 2(H). The display contents of the half part are shown in bit correspondence.

That is, in the display device of the present invention, the bitmap of the display control data is all "
By setting "l", it is possible to easily display the inverted mode.Furthermore, by setting the display control data bitmap to all "O" as shown in CG), the inverted characters and Numbers etc. can be restored and redisplayed.

Therefore, for example, if the upper half of FIG.
) can be easily restored and displayed in the full-density monochrome mode.

In the above description, a CR7 display is used as the 1 display 9, but it goes without saying that other displays such as an LCD display may be used instead.

〔effect〕

As is clear from the above description, according to the present invention, this type of display device is provided with a display control memory independent of the conventional display data memory, and stores display control data representing a display mode. Display in various modes is performed by displaying logical products with display data representing characters, numbers, etc., so the display can be reversed simply by rewriting the contents of the display control memory with a simple processing command from the central processing unit. A special effect is obtained in that complex display processing such as restoration and redisplay can be performed extremely easily.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing one embodiment of the configuration of the display device of the present invention, and FIGS. 2 (A) to (I) show display control data, display data such as letters and numbers, and the like in the display device of the present invention. ...Interface control circuit, 2A...λ data register, 2B...control command register, 3A...data register, 3B...address register, 4...memory control circuit,
:5A...Display data memory. 5B...Display control memory, 6A...Display data register, 6B...Display control register. 7... Exclusive OR (XOR) circuit, 8... Display control circuit, 9... CR7 display. 1′ ■

Claims (1)

[Claims] 1) Accepting an input image signal to which a control command code is attached by combining a display data signal for each dot consisting of a bitmap and a display control signal representing a display mode, and controlling the control command code. input register means for temporarily storing the display data signal and the display control signal separated for each dot based on the dots; a display data memory for sequentially storing the display data signal and the display control signal, respectively; a display control memory; a memory control means for controlling input/output of the display data memory and the display control memory; and one dot of the memory contents of the display data memory and the display control memory under the control of the memory control means. A display device comprising a logical product forming means for forming an exclusive OR of units and a display means for outputting and displaying the exclusive OR. 2) In the display device according to claim 1, by setting the bitmap forming the display control signal to all "1" and all "0", each display mode of inverted display and restored redisplay can be set. A display device characterized by: