JPS638791A - 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 Industrial Application] The present invention relates to a display device for displaying characters, graphics, etc. on a CRT or the like of a television receiver.

[Summary of the invention]

The present invention provides a display device for displaying characters, graphics, etc. on a CRT of a television receiver, which includes a character pattern memory, a shift register that receives character signals from the character pattern memory one row at a time, and a character pattern memory that receives character signals from the shift register. By having a delay means for delaying the pulse signal and displaying a character by adding the character pulse signal outputted by the shift register and the output pulse signal of the delay means, good display can be achieved with a simple circuit configuration. I made it possible.

[Conventional technology]

Conventionally, in television receivers (@! machines, PI such as CRT etc.
On the other hand, the receiving channel, input switching state (video manual, R
GB input, etc.) is used to display characters and figures.

This is equipped with a character pattern RnM in which a pattern of characters etc. to be displayed by the television receiver is stored, and a character signal such as characters etc. is extracted from this character pattern ROM at a predetermined time and display is performed using this character signal. There is. For example, if the entire display of ``Kana characters are made up of 10 dots in the horizontal direction x 14 dots in the vertical direction'' is performed, a pattern as shown in FIG. 4 will be displayed on the screen (on the device).

By the way, when the display pattern on such a display device is a relatively simple shape such as a number, it is easy to distinguish the display even with this number of dots, but when the display pattern is a relatively simple shape like a number, it is easy to identify the display even with this number of dots. In the case of relatively complex shapes such as kanji, there are places where the connections between each dot are not smooth (for example, places where the top display dots do not overlap when displaying diagonal lines). (<, it was not a good display.

For this reason, for example, as disclosed in Japanese Patent Application Laid-Open No. 58-75192, a character signal taken out from a character pattern ROM is converted into a character signal for good display using a circuit called a smoothing circuit. It has been proposed to display the character No. 1M every time. FIG. 5 is a diagram showing an example of a display in which the character signal stored in the character pattern ROM is converted by a smoothing circuit so as to display the example in FIG. 4 in this manner. In other words, horizontal and vertical dots
/ ) If the number of bits is not well connected, such as when displaying a slanted line, add one dot at the end of a given horizontal line as shown by hunting in the opposite direction. The purpose of this is to provide a display that is accurate.

By doing so, even complex shapes can be displayed satisfactorily.

[Problem that the invention seeks to solve]

However, it is not easy to increase the number of dots as shown in the example in Figure 5, especially when character patterns RO
This is difficult when displaying fine characters in which the original character signal stored in M has a large number of dots. In other words, as shown in the example in Figure 4 (when displaying 14 horizontal lines in the vertical direction, one horizontal scanning line is assigned to each horizontal line, and 14 dots and 7 dots in the vertical direction are displayed with 14 horizontal scanning lines). However, the vertical resolution of a general television receiver is determined by the number of horizontal scanning lines, and it is impossible to display two dots in the vertical direction with a horizontal scanning line. It was not possible to increase the number of vertical dots without changing the font size.Also, as shown in the example in Figure 5 (r.
r! This has the disadvantage of having a complicated circuit configuration requiring multiple decoders or the like.

SUMMARY OF THE INVENTION The present invention has been made in view of these points and aims to provide a display device that can provide good display with a simple circuit configuration.

[Means for solving problems]

As shown in FIG. 1, the display device of the present invention includes a character pattern memory (8) and
) has a shift register (9) that takes in characters (bar symbols) one row at a time, and a delay means (13) that delays the character pattern signal from this shift register (9), which the shift register (9) outputs. Characters are displayed by adding the character pulse signal and the output pulse signal of the delay means (13).

[Effect]

In the display device of the present invention, since the pulse signal delayed by the delay means (13) is displayed together with the character pulse signal, the connections between the respective leather dots are improved, and the pulse signal delayed by the delay means (13) A simple circuit configuration is sufficient, just adding the character pulse signal to the character pulse signal, and a good display can be achieved with a simple circuit configuration.

〔Example〕

An embodiment of the display device of the present invention will now be described with reference to FIGS. 1 to 3.

The display device of this example displays characters and the like at predetermined locations on both sides of the CRT of a television receiver. That is, as shown in FIG.
(Natsushaku, I
) and a video circuit (4) to generate a video signal for image reception, this video signal is supplied to a mixing circuit (5), and the mixing circuit (5) mixes an output signal of a display device, which will be described later, with the video signal. This mixed video signal is supplied to the CRT drive circuit (6), and the drive circuit (6) causes the CRT (7) to project an image with the display pattern.

In this example, characters, etc. are displayed based on the data stored in the character ROM (81). That is, the character ROM (81) stores a plurality of patterns of characters, figures, etc. to be displayed, and when displaying, A character signal of a predetermined pattern is output to the shift register (9) according to a command from a microcomputer (not shown) provided in this television reception hall.
OM (Each pattern stored by 81 is horizontally 1
The character signal is composed of 0 bit x 14 bits in the vertical direction, and the character signal is supplied to the shift register (9) by sequentially supplying each horizontal line of 10 bits in the horizontal direction in synchronization with the horizontal scanning period. In this way, the shift register (
Characters (No. 4) supplied to 9) for each horizontal line are sequentially output in line with the shift clock signal obtained at terminal (11) during the period when the load pulse signal obtained at terminal (10) is supplied. Then, the output No. 14 of this shift register (9) is supplied to one input terminal of the OR gate circuit (12) and the D input terminal of the D flip-flop (13). A signal obtained by inverting the shift clock signal obtained by passing through the inverter circuit (14) is supplied to the clock pulse signal input terminal of the D flip-flop (13).Then, the Q output terminal (13) of this D flip-flop (03) is supplied. The output signal obtained in the above is supplied to the other input terminal of the OR gate circuit (12).

Then, the video signal from the video circuit (4) is supplied to the other input terminal of the mixing circuit (5).
The output signal of this OR gate circuit (12) is supplied.

By configuring the display device of this example as described above, a predetermined display is performed by the character signal outputted by the character ROM (81). That is, the pattern stored in the character ROM (81) shown in FIG. As an example of a pattern for displaying ``ru'', assume that the character signal (0011000010) of the 11th horizontal line from the top of this ``ru'' pattern is being supplied to the shift register (9). When the character signal of the 11th line is supplied to the shift register (9), the terminal (10
) is supplied with a signal (not shown), which synchronizes with the rise and fall of the shift clock signal, which changes with one dot interval in the horizontal direction as one cycle, as shown in Figure 2. , (00110
00010) is output from the shift register (9). When the output signal of this shift register (9) is supplied to the D flip-flop (13), the shift clock signal as shown in FIG. Again, the previous issue is output as a clock pulse signal (No. 3 is created.

Therefore, as the output signal of this D flip-flop (13), the soft clock signal (second
This is a signal that changes at the falling edge of the signal (to the figure), and is a signal that is the output signal of the shift register (9) at 1/2 dot intervals. The output signal of the OR gate circuit 12) (FIG. 2D) is the output signal of the shift 1 register (9) (FIG. 2B) and the output signal of the D flip-flop (13) (FIG. 2C). ). Therefore, the signal supplied to the mixing circuit (5) is a signal whose rising edge is shifted by 1/2 dot interval from the output signal of the shift register (9), and the displayed characters are shifted from the output signal of the shift register (9).
Compared to the displayed characters (Fig. 4) when only the output signal of t is supplied to the T footrest circuit (5), as shown in Fig. 3, the right end of each display dot is not shown as a reverse hatch but a 1/2 dot. has been added. In this way, the signal forming the neo-like display pattern shown in Fig. 3 is superimposed on the video signal in the T-stool circuit (5), and characters, etc. are displayed at a predetermined location on the video of the television broadcast, etc. on the CRT (71). Ru.

In this way, the characters displayed as shown in Fig. 3 (even when displaying oblique lines) have a car-shaped area in each of the upper and lower display dots, and the connections between each dot are smooth. This results in good character display that is easy to identify.
In this example, only an OR gate (12), a D-Flinob flop (13), and an inverter circuit (14) are added to display the example in Figure 3, and the circuit configuration does not require a decoder or the like. It's easy. In addition, in this example, there is no need to divide each horizontal line of the pattern stored in the character ROM (8) into two as in the conventional case, so if the pattern stored in the character ROM f81 cannot be divided finely into two. However, it can be displayed as a good character.

Note that the present invention is not limited to the above-described embodiments, and it goes without saying that various other configurations may be adopted without departing from the gist of the present invention.

〔Effect of the invention〕

The display device of the present invention has the advantage of being able to provide good display with a simple circuit configuration in which each display dot is well connected.

[Brief explanation of the drawing]

i'e Figure 1 is a configuration diagram of an embodiment of the display device 51 of the present invention, Figure 2 is an evening/time chart diagram for explaining the example in Figure 1, and Figure 3 is based on the example in Figure 1. An example of a display is a box diagram, and FIGS. 4-1 and 5 are diagrams showing examples of conventional displays, respectively. (8) is a character ROM1, (9) is a shift I register, (12) is an OR gate circuit, (13) is a D flip-flop, and (14) is an inverter circuit.

Claims (1)

[Scope of Claims] The shift register includes a character pattern memory, a shift register that takes in character signals from the character pattern memory one row at a time, and a delay means that delays a character pulse signal from the shift register, and the shift register outputs an output signal. A display device characterized in that a character pulse signal is added to an output pulse signal of the delay means to display a character.