JPH01107187A - Display device of clock - Google Patents

Abstract

PURPOSE:To select and display hands having various shapes arbitrarily, by providing a means, which determines clock display patterns in correspondence with time data, reads characters out of a character generator and converts the data into video signals. CONSTITUTION:When the hands of a clock are displayed, a CPU 1 inputs time data, determines the display patterns of the hands corresponding to the time from a program stored in a program ROM 3 in accordance with said data and reads characters out of a character generator 2 in correspondence with said patterns. The characters are written into a video RAM 5 from a video processor 4. The content, which is written in the RAM 5, is outputted as a video signal. The video signal is added to an RGB encoder, which is connected to a the video signal line of a TV receiver. The video signal is displayed on a CRT instead of an image signal. Or the video signal is mixed with the image signal and displayed on the CRT in a superimposed pattern. In this way, the hands which are arbitrarily selected among many kinds of shapes can be displayed simply.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a clock display device for displaying an analog clock on a CRT of a television receiver.

[Conventional technology]

Use your television receiver's CRT as a clock face to display the hour, minute, and second hands on your favorite solid color background, or superimpose the hands on the television broadcast. A clock display device has been proposed.

This clock display device inputs time data and calculates a line connecting the base end (center) and tip position of each hand (that is, the part displayed as a hand) according to the current time. A method is adopted in which the dot display position is determined and the dot is displayed accordingly.

[Problem that the invention seeks to solve]

Therefore, the shape of the needle to be displayed must be a single shape. This is because when changing the shape of the needle, the calculation method changes each time the shape is changed, and the calculation becomes extremely complicated depending on the shape.

The present invention has been made in view of these points, and an object of the present invention is to provide a timepiece display device in which hands of various shapes can be arbitrarily selected.

[Means for solving problems]

For this purpose, the clock display device of the present invention includes means for determining a clock display pattern according to manually inputted time data, a removable character generator incorporating characters read out based on the data from the determining means, and a character generator read out based on the readout characters. and means for converting the data into a video signal.

〔Example〕

Examples of the present invention will be described below. FIGS. 1 to 3 are diagrams showing one embodiment thereof. Reference numeral 1 denotes a CPU that controls the entire system, to which time data is input at a timing of 8 times/second. 2 is a character generator that stores a plurality of characters that are part of the hands, 3 is a ROM for a display program in which a display pattern according to the above-mentioned time data is programmed in advance, and 4 is a video signal for clock display (including a synchronization signal). 5 is a video RAM that temporarily stores the contents of the clock display format.

The characters stored in the above-mentioned character generator 2 are characters having a size of 8×8 dots, and are configured so that a part of the necessary needle is included within the size of the character. For example, the shape of the needle A shown in FIGS. 2(a) to 2(C) is composed of a plurality of unit characters X represented by mouths (squares).

Now, in order to display the hands of the clock, the time data (
The CPU inputs data (indicating hours, minutes, and seconds), and according to that data, a display pattern for the hands corresponding to that time is determined by the Floodram stored in the program ROM 3, and the character generator 2 Read characters from. Then, this character is written from the video processor 4 to the video RAM 5,
The contents written in the video RAM 5 are output as a video signal. This video signal is added to an RGB encoder (not shown) connected to the video signal line of the television receiver, and is displayed on the CRT instead of the video signal.
Alternatively, it is mixed with a video signal and displayed on a CRT in a superimposed format.

In Figure 2, (a) to (C) are diagrams showing the hands of a clock, and 1
The book needle A is displayed by positioning a plurality of unit characters X at predetermined positions. This positioning and selection of unit character
It is executed by the program stored in 3.

In this way, in this embodiment, the needle shape data is stored in the character generator 2, so the character generator 2 is configured to be detachable, for example, a ROM cassette, and the ROM cassette can be used to store needles of each shape. If a plurality of needles are prepared accordingly, it becomes possible to freely select a needle of any shape simply by replacing the ROM cassette.

〔Effect of the invention〕

As described above, according to the present invention, it is possible to display hands arbitrarily selected from a variety of shapes very easily.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of the configuration of a clock display device according to an embodiment of the present invention, FIG. 2 is an explanatory diagram of the display form of hands, and FIG. 3 is a flowchart of display operation. Agent Patent Attorney Tsune Akira Nagao video 5ill. Figure 2

Claims (2)

[Claims] (1) A means for determining a clock display pattern according to input time data, a removable character generator containing characters read out according to the data from the determining means, and converting the read character data into a video signal. A clock display device characterized by comprising means for: (2) The character generator is a removable RO
Claim 1 characterized in that it consists of an M cassette.
Clock display device as described in section.