JP3350998B2 - Display device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an interlaced display for displaying odd and even fields alternately.

[0002]

2. Description of the Related Art Conventionally, when a non-interlaced signal is input to a display of this type, the data to be displayed is the odd field data supplied when the non-interlaced signal is input. Or even data for even fields.

[0003]

In the conventional display device of the prior art described above, the characters "eyes" are displayed as shown in FIG. 6 in the interlaced display, but in the non-interlaced display, for example, However, when only the data for the even field is displayed, there is a problem that the horizontal line disappears and the display cannot be determined as shown in FIG.

Further, when a non-interlaced signal is input, data of an odd field and data of an even field are displayed alternately on the same scanning line. However, this causes a problem of flicker. .

The present invention has been made in view of such a situation, and an interlaced display device capable of performing easy-to-understand display even when a non-interlaced signal is input and free from flicker. The purpose is to provide.

[0006]

A display device according to the present invention records an image processing means for processing an input image signal and a first character signal corresponding to a character signal for displaying an odd field in an interlaced system. First recording means;
A second recording unit for recording a second character signal corresponding to a character signal for displaying even-numbered fields in an interlaced system; a determining unit for determining whether an image signal is an interlaced system or a non-interlaced system; When the determination result by the means is the interlace method, the first character signal and the second character signal are alternately output from the first recording means and the second recording means so that the first character signal and the second character signal are output alternately.
The recording means and the second recording means are alternately selected, and when the result of the discrimination by the discrimination means is a non-interlace method, a character signal close to the character to be reproduced among the first character signal or the second character signal So that the first
Selecting means for selecting a predetermined one of the recording means or the second recording means, and a first character signal output from the first recording means or the second recording means selected by the selecting means Alternatively, the image processing apparatus further includes a generating unit that generates the display data by combining the second character signal and the image signal processed by the image processing unit.

[0007]

In the display device of the present invention , an input image signal is processed, a first character signal corresponding to a character signal for displaying an odd-numbered field in an interlaced system is recorded, and a signal for displaying an even-numbered field in an interlaced system is recorded. A second character signal corresponding to the character signal is recorded,
It is determined whether the image signal is of the interlace type or the non-interlace type. If the determination result is of the interlace type, the first character signal and the second character signal are alternately output so that the first character signal and the second character signal are output alternately. Recording means and second
Are alternately selected, and when the determination result is a non-interlaced type, the first character signal or the second character signal is output such that a character signal close to the character to be reproduced is output. A predetermined one of the recording means or the second recording means is selected, and the first character signal or the second character signal output from the selected first recording means or the second recording means. And the processed image signal are combined to generate display data. Therefore, even if a non-interlaced signal is input, an easy-to-understand display can be performed and flicker does not occur.

[0008]

FIG. 1 shows the configuration of an embodiment of the display device of the present invention. The video signal processing circuit 2 performs processing such as amplification on the input video signal and supplies the processed signal to one input of the mixer 4. The mixer 4 calculates the logical sum of the output signal of the video signal processing circuit 2 and the display screen signal from the display screen 12 and supplies the logical sum to the CRT 6.

The synchronization separation circuit 8 separates a horizontal synchronization signal and a vertical synchronization signal from an input video signal, and supplies them to a deflection circuit 10, a display panel 12, and an interlace / non-interlace discrimination circuit 16. Deflection circuit 1
0 generates a sawtooth wave for horizontal deflection based on the horizontal synchronization signal and supplies it to the horizontal deflection coil of the CRT 6, generates a sawtooth wave for vertical deflection based on the vertical synchronization signal, and generates a sawtooth wave for vertical deflection on the vertical deflection coil of the CRT 6. Supply.

The display unit 12 supplies an odd / even switching control signal to the switch 18 in accordance with a display character control signal from the microcomputer 14 and a horizontal synchronization signal and a vertical synchronization signal from the synchronization separation circuit 8. .

One terminal of the switch 18 is connected to a readout output terminal of the odd field display character font data storage device 20, and the other input terminal of the switch 18 is connected to
The read output terminal of the even field display character font data storage device 22 is connected. The odd field display character font data storage device 20 stores interlaced odd field display character font data. Even field display character font data storage device 2
2 stores character font data for displaying even-numbered fields in an interlaced format. The display character font data stored in the odd field display character font data storage device 20 is closer to the original data to be reproduced than the display character font data stored in the even field display character font data storage device 22.

An interlace / non-interlace discriminating circuit 16 discriminates, based on the horizontal synchronizing signal and the vertical synchronizing signal supplied from the synchronizing / separating circuit 8, whether the input video signal is interlaced or non-interlaced. Has no effect on the switch 18, but in the case of the non-interlace system, the switch 18 is forcibly switched to the odd field display character font data storage device 20 side.

FIG. 2 shows readout of display character font data, display on the display screen, and synchronization signals when an interlaced signal is input in the embodiment of FIG.
When an interlaced signal is input, the interlaced / non-interlaced discriminating circuit 16 switches the switch 1
No operation is performed on the display unit 8 and the display unit 12 displays the characters (for example, “eyes”) indicated by the display character control signal from the microcomputer 14 in an interlaced manner. In response to the signal (see FIG. 2C), the switch 18 is operated so that the character font indicated by the display character control signal is alternately read from the odd field display character font data storage device 20 and the even field display character font data storage device 22. Control. As a result, odd-numbered field display character font data and even-numbered field display character font data (see FIG. 2A) are alternately output from the display device 12, and these font data are output to the CR via the mixer 4.
It is displayed at T6 (see FIG. 2B).

FIG. 3 shows the reading of display character font data, the display on the screen, and the synchronizing signal when a non-interlaced signal is input in the embodiment of FIG. When a non-interlaced signal is input, the interlaced / non-interlaced discriminating circuit 16 forces the switch 18 to close the odd field display character font data storage device 20 side. Screen display device 12
In order to display characters (for example, "eyes") indicated by the display character control signal from the microcomputer 14 in a non-interlaced manner, a horizontal synchronizing signal and a vertical synchronizing signal (see FIG. The character font indicated by the display character control signal is read from the odd field display character font data storage device 20 in both the odd field and the even field in accordance with each field (the horizontal synchronization signal and the vertical synchronization signal having the same phase are supplied) ( FIG. 3A).

As a result, the display device 12 outputs the odd field display character font data in both the odd field and the even field, and the font data is displayed on the CRT 6 via the mixer 4 ( FIG. 4) .
3 (b)). As described above, the display character font data stored in the odd field display character font data storage device 20 is more original data to be reproduced than the display character font data stored in the even field display character font data storage device 22. , A clear display can be provided. In addition, since the same character font is displayed in both the odd field and the even field, flicker does not occur.

In the embodiment shown in FIG. 1, the display character font data stored in the odd field display character font data storage device 20 is made smaller than the display character font data stored in the even field display character font data storage device 22. When a non-interlaced signal is input assuming that the data is close to the original data to be reproduced, the character font indicated by the display character control signal from the odd field display character font data storage device 20 is displayed in both the odd field and the even field. Although the display character font data stored in the even field display character font data storage device is read out, the original data to be reproduced is smaller than the display character font data stored in the odd field display character font data storage device. Shall be close to When a signal down interlace method is input, it may be in both the odd and even fields from even field display character font data storage device to read out the character font indicated by the display character control signal.

FIG. 4 shows the configuration of another embodiment of the display device of the present invention. In this embodiment, an odd field display character font data storage device 20 for storing interlaced odd field display character font data, and an even field display character font data storage device 22 for storing interlace even field display character font data are provided. Is provided with a separate display character font data storage device 24 dedicated to non-interlace.

FIG. 5 shows the storage contents of the odd field display character font data storage device 20, the even field display character font data storage device 22, and the non-interlace display character font data storage device 24 of FIG. When a non-interlaced signal is input, the interlace / non-interlace discriminating circuit 16 forces the switch 18A to close the non-interlaced display character font data storage device 24 side. The display device 12 displays non-interlaced display character font data in both odd and even fields in order to display characters (for example, “day” ) indicated by the display character control signal from the microcomputer 14 in a non-interlaced manner. The character font indicated by the display character control signal is read from the storage device 24.

As a result, display character font data for non-interlace is output from the display unit 12 in both the odd field and the even field, and the font data is displayed on the CRT 6 via the mixer 4. Therefore, an easy-to-understand display can be performed. In addition, since the same character font is displayed in both the odd field and the even field, flicker does not occur.

[0020]

According to the display device of the present invention , an input image signal is processed, a first character signal corresponding to a character signal for displaying an odd field in an interlaced system is recorded, and an even field in an interlaced system is recorded. A second character signal corresponding to the character signal for display is recorded, and it is determined whether the image signal is an interlace system or a non-interlace system. The first recording unit and the second recording unit are alternately selected so that the second character signal is output alternately. If the result of the determination is a non-interlaced system, the first character signal or the second A predetermined one of the first recording means or the second recording means is output so as to output a character signal close to a character to be reproduced among the character signals. Is selected, and the first character signal or the second character signal output from the selected first recording means or the second recording means is combined with the processed image signal to generate display data. Thus, even if a non-interlaced signal is input, an easy-to-understand display can be performed and flicker does not occur.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration of a display device according to an embodiment of the present invention.

FIG. 2 is a diagram showing readout of display character font data, display on a screen, and a synchronization signal when an interlaced signal is input in the embodiment of FIG. 1;

FIG. 3 is a diagram showing readout of display character font data, display on a display screen, and a synchronization signal when a non-interlaced signal is input in the embodiment of FIG. 1;

FIG. 4 is a block diagram showing a configuration of another embodiment of the display device of the present invention.

FIG. 5 is a diagram showing storage contents of an odd field display character font data storage device 20, an even field display character font data storage device 22, and a non-interlace display character font data storage device 24 of FIG.

FIG. 6 is a diagram showing a display example when an input signal is of an interlaced type in a conventional display device.

FIG. 7 is a view showing a display example when an input signal is of a non-interlaced type in a conventional display device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 12 Screen display device 14 Microcomputer 16 Interlace / non-interlace discriminating circuit 18 Switch 20 Odd field display character font data storage device, 22 Even field display character font data storage device 24 Non-interlace display character font data storage device

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-56-156873 (JP, A) JP-A-4-245875 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) H04N 5/38-5/46 G09G 1/00-1/28 G09G 5/00-5/42

Claims (1)

(57) [Claims] 1. An image processing means for processing an input image signal; a first recording means for recording a first character signal corresponding to a character signal for displaying an odd-numbered field in an interlaced system; A second recording unit that records a second character signal corresponding to a character signal for displaying even-numbered fields; a determination unit that determines whether the image signal is the interlace system or the non-interlace system; When the result of the determination by the means is the interlace method, the first character signal and the second character signal are output alternately from the first recording means and the second recording means. 1 recording means and the second recording means are alternately selected, and the discrimination result by the discrimination means is the non-interlace method. If,
Of the first character signal or the second character signal, a predetermined one of the first recording means or the second recording means is output so that a character signal close to a character to be reproduced is output. Selecting means for selecting the first character signal or the second character signal output from the first recording means or the second recording means selected by the selecting means, and the image A display unit that generates display data by combining the image signal processed by the processing unit with the image signal.