JPH09154086A - Display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To display an image with a fixed horizontal scanning clock even when the ratio of subordinate image display blocks to horizontal main image display blocks is more than the ratio of subordinate image period to a horizontal main image period concerning a display device for displaying the image of aspect ratio horizontally shorter than a display part. SOLUTION: A control part 5 controls a column driver 2, row driver 3, fixed horizontal scanning clock generating part 4 and video signal switching means 8 so that the signal from a main video signal processing part 6 can be displayed in a main image display block 10 of display part 1. Besides, during any period excepting for the main image of horizontal scanning, the control part 5 controls the column driver 2, row driver 3, fixed horizontal scanning clock generating part 4 and video signal switching means 8 so that the signals from a subordinate video signal processing part 7 can be simultaneously displayed in a left subordinate image block 9 and a right subordinate image block 11 of display part 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a matrix type display device for displaying an image having an aspect ratio shorter in the horizontal direction than a display section.

[0002]

2. Description of the Related Art In recent years, with the advance of full-scale broadcasting such as EDTV, a horizontally long type (for example, 16: 9) type of image display device has begun to spread, as compared with the conventional 4: 3 aspect ratio. However, even in the horizontally long type display device, a display device capable of displaying an image having an aspect ratio shorter than the display portion in the lateral direction (for example, a 4: 3 image with respect to a 16: 9 display portion) is required.

A conventional display device is, for example, Japanese Patent Laid-Open No.
No. 131182. The conventional display device will be described below. FIG. 5 shows a block diagram of this conventional display device. In FIG. 5, the display device is compatible with an aspect ratio of 16: 9 and includes a column driver 2 connected to a column line of the display unit 27 and a row driver 3 connected to a row line.

The operation of the display device constructed as above will be described below. Since a 4: 3 image is displayed on the display screen having the aspect ratio of 16: 9, the horizontal image display period is set to about 75% of the horizontal synchronization period, and the left margin section 28 and the right margin are set to the remaining 25% period. Part section 29
Is displayed. Therefore, the horizontal scanning clock is constantly applied to the column driver 2 and the scanning start pulse is applied at the center of the horizontal blanking period.

[0005]

However, in the above-mentioned conventional configuration, when the aspect ratio of the image to be displayed is 4: 3, the image display period is about 75% of the horizontal synchronization period. For example, in the NTSC signal, the effective scanning period is set. Since it is about 90% of the above, there is a problem that the horizontal display rate can be obtained only up to about 90%.

The present invention solves the above-mentioned conventional problems. In a display device for displaying an image having an aspect ratio shorter in the horizontal direction than the display section, the horizontal main video period is higher than the horizontal main video period. An object of the present invention is to provide a display device capable of displaying with a constant horizontal scanning clock even when the ratio of the sub-picture display section to the picture display section is large.

[0007]

In order to solve this problem, the display device of the present invention displays a signal from the main video signal processing unit when displaying a video whose aspect ratio is shorter in the horizontal direction than the display unit. Column driver and row driver so that the signals from the sub-video signal processing unit that are displayed in the main video display section of the display section are simultaneously displayed in the left and right sub-video sections of the display section during the period other than the horizontal scanning main video. It is configured to control the constant horizontal scanning clock generator and the video signal switching means.

As a result, the period for displaying the sub-picture display section is halved, and the limitation on the horizontal display rate can be avoided.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention includes a display unit for displaying a video, a column driver for selecting a video signal display position in the horizontal direction of the display unit, a row driver for selecting a drive row in the vertical direction of the display unit, and a fixed number. A horizontal scanning clock generation unit, a main video signal processing unit that outputs a main video signal, a sub video signal processing unit that outputs a sub video signal, a video signal switching unit that switches between the main video signal and the sub video signal, and a display unit. When displaying an image with an aspect ratio shorter than the horizontal direction, the signal from the main video signal processing unit is displayed in the main video display section of the display unit, and the sub video signal processing unit is activated during the period other than the horizontal scanning main video. Is provided with a column driver, a row driver, a constant horizontal scanning clock generator, and a controller for controlling the video signal switching means so that the signals from the display unit can be simultaneously displayed in the left and right sub-picture display sections of the display unit. Display Is obtained by a, thereby, it has the effect of displaying the left and right sub-picture display interval at the same time.

Alternatively, in addition to the above, a display device is characterized by comprising a column driver including a shift register circuit and a sample and hold circuit, and a sampled and held video signal is sent to the display section. It has the effect of sending for a predetermined time. Embodiments of the present invention will be described below with reference to the drawings.

(First Embodiment) FIG. 1 is a block diagram of a display device according to a first embodiment of the present invention. FIG.
2, a display unit 1 capable of displaying an image with an arpect ratio of 16: 9, a column driver 2 including a shift register circuit 12 for selecting a horizontal video signal display position of the display unit 1, and a display unit 1 A row driver 3 for selecting a driving row in the vertical direction, a constant horizontal scanning clock generator 4, a main video signal processor 6 for outputting a main video signal, a sub video signal processor 7 for outputting a sub video signal, When the video signal switching means 8 for switching between the main video signal and the sub video signal and the video having an aspect ratio (for example, 4: 3) shorter than the display unit 1 in the horizontal direction are displayed, the signal from the main video signal processing unit 6 is The signal is displayed in the main video display section 10 of the display unit 1 and the signal from the sub video signal processing unit 7 is displayed during the period other than the horizontal scanning main video, and the left sub video display section 9 and the right sub video display section 11 of the display unit 1 are displayed. To be displayed at the same time And a and column driver 2 and row driver 3 and a control unit 5 for controlling the constant horizontal scanning clock generator 4 and the video signal switching means 8.

The display unit 1 is a so-called matrix type display unit having display pixels at intersections of a plurality of column lines selected by the column driver 2 and a plurality of row lines selected by the row driver. is there. FIG. 2 shows the first embodiment.
6 is a horizontal system timing diagram of FIG. The operation will be described below with reference to FIGS. 1 and 2.

The control unit 5 sends a scanning start pulse 15 to the shift register circuit 12 of the column driver 2 at the start of the sub-picture signal period 22, and sends a horizontal scanning clock control signal 17 to the constant horizontal scanning clock generation unit 4. The control for sending out the horizontal scanning clock 16 from the constant horizontal scanning clock generator 4 is performed. At the same time, the control section 5 controls the row driver 3 to select the n-th row selection signal 19 indicating an arbitrary row of the display section 1.
Is output from the row driver 3. Next, the control unit 5 changes the video signal switching unit control signal 18 so that the main video signal output from the main video signal processing unit 6 is output from the video signal switching unit 8 at the start of the main video signal period 23. Next, the control unit 5 stops the output of the horizontal scanning clock 16 from the constant horizontal scanning clock generation unit 4 by changing the horizontal scanning clock control signal 17 at the end of the main video signal period 23, and the video signal switching means 8 is started. The video signal switching means control signal 18 is changed so that the sub video signal of the output of the sub video signal processing unit 7 is output. At this time, in the column driver 2, the column selection position shifted by the horizontal scanning clock 16 (that is, the scanning start pulse 15) is stopped at the position corresponding to the starting point of the right sub-picture display section 11. After that, the n-th row selection signal 19 is shifted to the (n + 1) -th row selection signal 20 and the (n + 2) -th row selection signal 21, and the same operation is repeated otherwise, so that the main video signal period 23 is continued. It is displayed in the display section 10, and during the sub-picture signal period 22, the column selection position is simultaneously shifted to the left sub-picture display section 9 and the right sub-picture display section 11 to display the sub-picture.

(Second Embodiment) FIG. 3 is a block diagram of a display device according to a second embodiment of the present invention. FIG.
1 is different from FIG. 1 in that the column driver 2 includes a sample hold circuit 13. FIG. 4 shows a horizontal system timing chart of the second embodiment. Less than,
The operation will be described with reference to FIGS. 3 and 4.

The control unit 5 sends a scanning start pulse 15 to the shift register circuit 12 of the column driver 2 at the start of the sub-picture signal period 22, and sends a horizontal scanning clock control signal 17 to the constant horizontal scanning clock generation unit 4. The control for sending out the horizontal scanning clock 16 from the constant horizontal scanning clock generator 4 is performed. Next, the control unit 5 controls the main video signal period 2
At the start of 3, the video signal switching means control signal 18 is changed so that the video signal switching means 8 outputs the main video signal output from the main video signal processing section 6. Next, the control unit 5 stops the output of the horizontal scanning clock 16 from the constant horizontal scanning clock generation unit 4 by changing the horizontal scanning clock control signal 17 at the end of the main video signal period 23, and the video signal switching means 8 is started. The video signal switching means control signal 17 so that the sub video signal output from the sub video signal processing unit 7 is output from
To change. At this time, in the column driver 2, the column selection position shifted by the horizontal scanning clock 16 stops at a position corresponding to the start point of the right sub-picture display section 11. At the same time, the row driver 3 outputs the m-th row selection signal 24 indicating an arbitrary row of the display unit 1, and the sample hold circuit output enable signal 26 outputs the sampled and held image data to the display unit. The next scanning start pulse 15 and the horizontal scanning clock 16 shift the column selection positions in the left sub-picture display section 9 and the right sub-picture display section 11, and the sub-picture signal is output at the same time. After that,
By shifting the m-th row selection signal 24 to the (m + 1) -th row selection signal 25 and repeating the same operation for the rest, during the main video display period 23, the main video display section 10 is displayed, and during the sub video display period 22. Will simultaneously display images in the left sub-picture display section 9 and the right sub-picture display section 11.

In both of the above embodiments, the sub-picture signal processing section 7 may output a picture having an arbitrary gradation level as the sub-picture signal. Further, in both of the above-described embodiments, the horizontal scanning clock 16 is continuously output between the end of the sub video signal period 22 and the start of the main video signal period 23. However, switching transition between the sub video signal and the main video signal is performed. Considering time,
The horizontal scanning clock may be temporarily stopped.

In both of the above embodiments, a video signal symmetrical (inverted) with respect to a predetermined voltage is output from the main video signal processing section 6 and the sub video signal processing section 7 every horizontal synchronization or every vertical synchronization. You may let me. Further, in both of the above-described embodiments, the video output signal output from the video signal switching unit 8 may be RGB and may be output from the main video signal processing unit 6 and the sub video signal processing unit 7.

In both of the above embodiments, the horizontal scanning clock 16 may be an RGB three-phase system and may be output from the constant horizontal scanning clock generator 4.

[0019]

As described above, according to the present invention, when displaying an image having an aspect ratio shorter than that of the display unit in the horizontal direction, it is necessary to display the left and right sub-image display sections at the same time for displaying the sub-image. The period is halved, and it becomes possible to perform display without being restricted in the main video horizontal display rate.

[Brief description of the drawings]

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

FIG. 2 is a horizontal timing chart of the display device.

FIG. 3 is a block diagram of a display device according to a second embodiment of the present invention.

FIG. 4 is a horizontal timing diagram of the display device.

FIG. 5 is a block diagram of a conventional display device.

[Explanation of symbols]

 1 display section 2 column driver 3 row driver 4 constant horizontal scanning clock generation section 5 control section 6 main video signal processing section 7 sub video signal processing section 8 video signal switching means 9 left sub video display section 10 main video display section 11 right sub Video display section 12 Shift register circuit 13 Sample and hold circuit

Claims (8)

[Claims] 1. A display unit for displaying an image, a column driver for selecting a horizontal video signal display position of the display unit,
A row driver that selects a vertical drive row of the display unit, a constant horizontal scanning clock generation unit, a main video signal processing unit that outputs a main video signal, and a sub video signal processing unit that outputs a sub video signal, When displaying a video signal switching unit for switching between the main video signal and the sub video signal and a video having an aspect ratio shorter in the horizontal direction than the display unit, the signal from the main video signal processing unit is the abbreviation for the display unit. It is displayed in the main video display section located in the central portion, and the signals from the sub video signal processing section are simultaneously displayed in the left and right sub video display sections of the display section during the period other than the horizontal scanning main video. A display device comprising: a column driver, the row driver, a constant horizontal scanning clock generation unit, and a control unit for controlling a video signal switching unit. 2. The display device according to claim 1, comprising a column driver including a shift register circuit and a sample hold circuit. 3. The display device according to claim 1, wherein the display device comprises a column driver including a shift register circuit. 4. The display device according to claim 1, wherein the display device is configured by a sub-picture signal processing unit that outputs a picture of an arbitrary gradation level as the sub-picture signal. 5. A control unit for controlling so as not to appear on the display at the transition between the main video signal and the sub video signal at the boundary between the sub video display section and the main video display section. The display device according to claim 1, wherein the display device is a display device. 6. A main video signal processing unit and a sub video signal processing unit capable of producing a video signal symmetrical with respect to a predetermined voltage for each horizontal synchronization or each vertical synchronization. The display device according to claim 1. 7. The display device according to claim 1, wherein the display device comprises a main video signal processing unit that processes a video output signal as RGB. 8. The display device according to claim 1, wherein the display device is constituted by a constant horizontal scanning clock generation unit which generates a horizontal scanning clock signal as an RGB three-phase system.