JPS6078481A - Character display - 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 character display device, and particularly to a character display device suitable for displaying information attributed to characters.

[Background of the invention]

Generally, character display devices are used in word processors, personal computers, and the like.

Regarding normal character display devices, the first to third figures
This will be explained using figures.

FIG. 1 shows a display example.

The character display device has CR,T (C2
thode ay'11. ``ube) 1 screen vertically,
It is divided horizontally into predetermined blocks 2, and characters are displayed in each block 2.

FIG. 2 shows the (tl) configuration of the character display device.

A character code corresponding to the displayed character is read out from the code memory 3 by a screen scanning circuit (not shown), and a character pattern corresponding to this code is read out by the character generator 4.
The signal is then input to the parallel-to-serial conversion circuit 5, where it is converted into a serial signal. This serial signal is sent to the CRT"1 via a video synthesis circuit 8, which will be described later, and characters corresponding to the contents of the code memory 3 are displayed.

By the way, the character display device is Kernor.

It is necessary to display information associated with characters, such as black and white inversion, brightness, etc. For this purpose, attribute information is added to the character code stored in the code memory 3, a pattern is generated by the attribute pattern generator 7 via the register 6, and the video synthesis circuit 8 synthesizes it with the serial signal of the character pattern. teC
It is displayed on RTI.

In conventional character display devices, the attribute pattern generator 7 is composed of a simple logic circuit because there is little J, % property information and many simple patterns.

However, recently, the amount of attribute information in word processors and the like has rapidly increased, and display patterns have become more complex.

An example of this is shown in FIG.

That is, there are patterns (a) to (e) to display one character, and there is a tendency for the number of patterns to be further increased.

In order to solve this problem using the conventional method described above, the attribute pattern generator 7 would become complicated and the circuit size would increase. The objective is to provide a character display device that can handle an increase in attribute information with a simple circuit configuration.

[Summary of the invention]

The character display device according to the present invention includes a code memory that stores a code corresponding to a character to be displayed, a character generator that generates a character pattern corresponding to the code, and two characters that are sequentially read out from the character generator. In the character display device 6, which is a display section that displays the character butter / corresponding to the code memory,
The code memory is configured to store first and second corresponding codes for each character display area, and the character generator is configured to generate respective patterns corresponding to the first and second corresponding codes. In addition, a control circuit is provided for logically comparing each pattern read from the character generator and displaying the result.

In addition, the present invention stores character patterns in a character generator, which often has a large capacity, and also stores attribute patterns using the character generator, reads out character patterns and attribute patterns alternately, and reads out character patterns for each character. The superimposed display is performed by calculating the logical sum of the two.

[Embodiments of the invention]

An embodiment of the character display device according to the present invention is shown in the fourth and fifth embodiments.
This will be explained with reference to the figures.

Here, FIG. 4 is a configuration block diagram of a character display device according to an embodiment of the present invention, and FIG. 5 is a timing diagram thereof.

In the figure, 1 is C It T related to the display section described above;
9 is a code memory configured to store character codes and attribute codes corresponding to characters to be displayed, that is, first and second corresponding codes per character display area; 10 is a ROM', a RAM; A character generator 11, which generates a character pattern and a character pattern, that is, a pattern corresponding to the first and second corresponding codes, receives a character clock signal f.
A register 12i (1) stores the output of the character generator 10 at the rising edge of the character generator 10 and the register 11; an OR circuit 13 stores the output of the character generator 10 and the register 11; A parallel-to-serial conversion circuit 14 outputs the output from the parallel-to-serial conversion circuit 13 (0) and a horizontal conversion circuit (for example, 1) made by , a vertical synchronization signal, and outputs it to CR'll"1. 16 is a character clock related to the timing signal of the C1.j 'J' 1ljlJ control circuit 15 that scans the screen. A clock generator that generates a signal f/n and a clock signal f.

The operation of the device having the above configuration will be explained below with reference to the timing diagram of FIG.

In the figure, f is a clock signal, f/11 is a character clock signal, H and V are horizontal and vertical synchronization signals, respectively, A is an address signal, C is code information, G is pattern data, and P is is the output of the OR circuit 12, S is the serial signal, and L is the output of the register 11.

That is, the clock generator 16 generates the clock signal f shown in FIG. 4 corresponding to the dots of the character pattern, and also generates the character clock signal f for each character scan.
/n is output to the CR, T control circuit 15.

The CRT control circuit 15 outputs address signals A and C corresponding to the screen scanning position according to the character clock signal f/n.
A horizontal synchronization signal H and a vertical synchronization signal V of RTl are generated.

Code information C is read out from the code memory 9 according to the address signal formula, and pattern data G is read out from the character generator 10 in accordance with this code information C.

Here, it is assumed that the address signal A is incremented twice every time one character is scanned, and the character code is stored in the even-numbered area of the code memory 9 that stores the first corresponding code of the one-character display area.
Further, it is assumed that an attribute code is stored at an odd address where the second corresponding code is stored.

Therefore, from the character generator 10, a character pattern is first read out, and then an attribute pattern is read out, and the above-mentioned character pattern is stored in the register 11.

Then, the character pattern and the attribute pattern are processed by the OR circuit 12.
The signal is logically turned off and sent to the parallel-to-serial conversion circuit 13. The parallel-to-serial conversion circuit 13 receives the output P of the logic circuit 12 at the falling edge 9 of the character clock signal f/11, is shifted out at the clock signal f, becomes a serial signal S, and sends it to the video synthesis circuit 14. Sent.

Along with screen scanning, the above operation is repeated, and the CRTl
Furthermore, it is possible to display character patterns and attribute patterns in a superimposed manner.

Here, if it is desired to change the display contents, the contents of the code memory 9 can be rewritten using a computer (not shown) that controls the system.

Furthermore, when it is desired to add a new attribute pattern, the pattern can be displayed by adding the pattern to the character generator 10 and writing a code corresponding to the pattern into the code memory 9, in the same way as character patterns. If the character generator 10 is composed of a rewritable memory, just like the code memory 9, if such a pattern is input into a computer, it can be handled by simply changing the computer's hardware.

However, in this embodiment, the case has been described in which the character code is stored in the even numbered address of the court memory 9, and the attribute code is stored in the odd numbered address, but there is no problem even if the two are reversed. Character codes and attribute codes may be used without distinction.

〔Effect of the invention〕

According to the present invention, it is possible to provide a character display device 11"C which is inexpensive and has flexibility in display specifications because it has a relatively simple circuit configuration and can accommodate an increase in character attribute information without changing the circuit. be able to.

[Brief explanation of the drawing]

FIG. 1 is a general display example of a character display device, FIG. 2 is a block diagram of its 'l'lli structure, FIG. 3 is an example of character attribute information, and FIG. 4 is a diagram of the present invention. FIG. 5, a block diagram of the configuration of a character display device according to an embodiment, is a timing diagram thereof. 1...CITT, 9...=1- memory, 10.
...Character generator, 11...Register, 1
2...Logic O/U circuit, 13...Parallel IF, i1 column conversion circuit, 14...Video signal synthesis circuit, 15...C[1] control circuit, 16...Clock generator. Agent Patent attorney Kosaku Fukuda (and 1 other person) Figure 3 ((1,) (b), (C) (cl) Ce) (+)
(e) Koma 4 zu yama '5 fig.

Claims (1)

[Claims] 1. A code memory that stores a code corresponding to the character to be displayed, a character generator that generates a character pattern corresponding to the code, and a character pattern that is sequentially read out from this character generator and that corresponds to the code memory. In the character display device that is displayed from the display section, the code memory is configured to store first and second corresponding codes for each character display area, and the character generator is configured to store the first and second corresponding codes. 1. A character display device characterized in that the character display device is configured to generate respective patterns corresponding to the character generator, and is configured to input a control circuit for calculating the logical sum of the respective patterns read from the character generator and displaying the resultant result.