JPS61127280A - Picture display device - Google Patents

Abstract

PURPOSE:To improve the quality of pictures without damaging merits of a conventional large screen display device to reproduced natural and very realistic picture by providing a resolution converting part to display the part near boundaries between a high- resolution area in the center part and a low-resolution area in the peripheral part with an intermediate resolution. CONSTITUTION:When a picture near the center part of the screen is inputted from an image pickup tube 7, a switch in a selector 12 is connected to a contact (a), and a high-resolution picture signal is sent to a CRT1 of a high resolution through a driving circuit 2. When a picture in the peripheral part of the screen is inputted from the image pickup tube 7, the switch in the selector 12 is connected to a contact (b) by an area discriminating signal from an area discriminating part 11, and the high- resolution picture signal from the image pickup tube 7 is converted to a picture signal having the intermediate resolution by a low pass filter 10, and this picture signal 14 is sent to the driving circuit 2. The peripheral part of the screen is sent to an EL display device 3 through an EL display driving circuit 4 by an image pickup tube 6. Thus, a middle-resolution area 17 having the intermediate resolution is provided on the boundaries between a high-resolution area 15 and a low-resolution area 16 by the action of a resolution converting part 5.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to an image display device for a relatively large screen, and more particularly to an image display device that displays the center of the screen at a higher resolution than the periphery.

[Prior art]

Conventionally, screens have been made larger in order to improve the quality of displayed images and enhance the sense of realism.

However, in this case, simply increasing the size of the screen would result in an enormous amount of image information, causing problems in transmission and recording.

Therefore, attention has been paid to the human visual characteristic that visual acuity for areas other than the point of gaze deteriorates, and a method has been proposed in which the center of the screen is displayed in high resolution and the peripheral areas are displayed in low resolution.

For example, as shown in FIG. 10, an image display device has been proposed in which the screen is constructed by combining a liquid crystal display 102 around a CRT 101 with relatively high resolution, and displays a large screen as shown in FIG. ing. In Figure 11, 1
03 is a high resolution area 104 is a low resolution area.

Also, an image display device has been proposed in which a large number of EL displays, f-7 Zuma displays, or LFJs are arranged as the peripheral display element 102.

However, although it is possible to increase the screen size without significantly increasing the information I of the image by using these image display devices, there is one major problem in terms of visual effects.

That is, as shown in FIG. 11, the boundary between the high resolution area 103 and the low resolution area 104 is very conspicuous.

The more there is a difference in resolution between the center and the periphery, the more pronounced the border becomes, giving an unnatural feel. This problem is particularly noticeable in images where patterns are uniformly distributed on the screen. [Purpose] Therefore, the purpose of the present invention is to solve the above-mentioned problem by distributing patterns from the center of the screen to the periphery. An object of the present invention is to provide an image display device capable of significantly reducing resolution.

〔composition〕

In order to achieve the above object, the present invention includes a high-resolution display means for displaying the center of an image, and a low-resolution display means for displaying the peripheral part of the image. The present invention is characterized in that it includes a resolution conversion section that converts the resolution.

〔Example〕

Embodiments of the present invention will be described in detail below based on the drawings. FIG. 1 is a block diagram of an image display device according to a first embodiment of the present invention, in which 1 is a relatively high-resolution CRT which is a first display means for displaying the center of the screen, and 2 is a CRT.
3 is a relatively low-resolution EL display serving as a second display means for displaying the peripheral portion of the screen; 4 is a drive circuit for the EL display; and 5 is a resolution converter. Reference numeral 6 indicates an image pickup tube for capturing images of the periphery of the screen, 7 indicates an image pickup tube for the center of the screen, 8 indicates a half mirror, and 19 indicates a lens. The elements 6, 7, and 8°9 constitute an image data input section. Ru.

FIG. 2 is a block diagram showing a specific configuration of the resolution/conversion section 5. As shown in FIG. In the figure, IO is a low Z4 filter that passes low frequency components in the image information sent from the image pickup tube 7, and 11 is an area identification unit that counts the synchronization signal 13 and identifies the center and peripheral areas of the CRT screen. be. A selector 12 selects the image signal 14 based on the area identification signal from the area identification section 11.

FIG. 0 is a circuit diagram showing the configuration of the area identification section 11. In the figure, 1101 is a frequency separation circuit, 1102, 1103 are triangular wave generation circuits with different time constants, and 1104.11
05 is a voltage comparator, and 1106 is an OR dart.

Next, the effect will be explained. The synchronization signal input to the area identification section 11 is a signal such as that shown in FIG. 4 (,), which includes both vertical synchronization and horizontal synchronization. Frequency separation circuit 11
01 separates and outputs the vertical synchronization and horizontal synchronization (FIGS. 4(b) and (C)).

Triangular wave generating circuits 1102 and 1103 generate Vl and V in synchronization with a vertical synchronizing signal and a horizontal synchronizing signal, respectively.

A triangular wave with a peak voltage of is generated (Fig. 4(d)).

(e)).

Voltage comparators 1104 and 1105 each compare the triangular wave with a preset voltage value and output the results.

If we now identify the shaded area in FIG. 5 on the CRT screen, for example, the voltage comparator 1104 is set to . Similarly, voltage comparator 1105 is set to .

As a result, the output of ORG) 1106 becomes high level in the identification area.

When an image near the center of the screen is input from the image pickup tube 7 in this way, the switch in the selector 12 is connected to a, and a high-resolution image signal is sent to the drive circuit 2. Further, when an image of the peripheral part of the screen is input from the image pickup tube 7, the area identification signal issued by the area identification section 11 causes the selector 1 to
The switch in 2 is connected to b. For this reason, a high-resolution image signal from the image pickup tube 7 is converted by a low-pass filter 10 into an image signal having an intermediate resolution, and this image signal 14 is sent to the drive circuit 2.

Further, as shown in FIG. 1, the peripheral part of the screen is sent to the EL display 3 by the tM picture tube 6 via the EL display drive circuit 4.

As a result of the action of the resolution converter 50, it is possible to provide an intermediate resolution area 17 having an intermediate resolution at the boundary between the high resolution area 15 and the low resolution area 16, as shown in FIG. .

FIG. 7 is a block diagram of the resolution converter 5 of the image display device according to the second embodiment of the present invention. The feature of this embodiment is that the intermediate resolution region is divided into two stages.

In the same figure, 18 is a tenth pass filter that converts an image signal 14m having a high resolution into an image signal 14b having a medium resolution close to a relatively high resolution, and 19 converts an image signal 14m having a high resolution into a medium resolution image signal 14b having a relatively low resolution. In the selector 121, which is a 20th-pass filter that converts the image signal 14b into a resolution image signal 14b, a switch is connected to one of d, . That is, the center of the image is connected to switch d, the area around it is connected to e, and the area around it is connected to switch f.

FIG. 8 shows an image obtained by the second embodiment, and as shown in the figure, the screen is divided from the center to a high-resolution area 15, a first medium-resolution area 17m, and a second medium-resolution area 17b1. The resolution gradually decreases to a low resolution area (gL display) 16.

In the above embodiment, a low-pass filter, 10.18
．． 19 may be an analog calculation means or a digital calculation means as long as it converts the image to an intermediate resolution.

Further, the area identification unit 11511m can be easily realized by a combination of a kakunta and a comparator, but a microprocessor may be used depending on the case.

Furthermore, in the above embodiment, the screen was composed of a CRT and an EL display, but the application of the present invention is not limited to this example. It is sufficient to display the surrounding area using a relatively low-resolution element.

Therefore, excellent effects can be exerted in image display devices including, for example, plasma displays, liquid crystal displays, electrochromic displays, fluorescent displays, tubes 1, LEDs, and the like.

FIG. 9 is a diagram showing the principle of construction of an image display device according to a third embodiment of the present invention, and the feature of this third embodiment is that the present invention is applied to a projection type display gray. In the figure, 20 is a CRT that projects the center part of the screen, 21 is a CR'l' that projects the peripheral part of the screen, 22 is a drive circuit that drives the CRT 20, 23 is a drive circuit that drives the CRT 21,
24 is a resolution converter, and 25 is a screen, and the configuration of the resolution converter 24 is the same as in the first embodiment.

When such a projection display is used, the projection images from the two CRTs 20 #21 can be so good that the boundaries are almost indistinguishable on the screen.

〔effect〕

As described above in detail and concretely, according to the present invention, by providing the resolution conversion section, it is possible to display the vicinity of the boundary between the high resolution area and the low resolution area at an intermediate resolution, which is different from the conventional large resolution area. It is possible to improve the image quality without impairing the advantages of the screen display device, and it is possible to reproduce natural and realistic images.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an image display device according to a first embodiment of the present invention, FIG. 2 is a specific block diagram of a resolution converter,
FIG. 3 is a circuit diagram showing the configuration of the area identification section, FIG. 4 is a time chart of signals in the area identification section, FIG. 5 is a front view of a CRT screen, and FIG. 6 is a diagram showing an image by an image display device.
FIG. 7 is a block diagram of a resolution conversion unit of an image display device according to a second embodiment of the present invention, FIG. 8 is a diagram showing an image according to the second embodiment, and FIG. 9 is an image according to a third embodiment of the present invention. FIG. 10 is a block diagram of a display device, FIG. 10 is a diagram showing the configuration principle of a conventional image display device, and FIG. 11 is a diagram showing an image by a conventional image display device. In the figure, 1.20.21...CRT, 3...EL display, 5
゜24...Resolution conversion section. Representative Patent Attorney Ms. Yamashita Figure 2-Ft Figure 3 +103 1105 Figure 7 Figure 8

Claims (1)

[Claims] (1) A resolution conversion section that includes a high-resolution display means for displaying the center of the image and a low-resolution display means for displaying the peripheral part of the image, and that converts the resolution of the periphery of the high-resolution display means. An image display device comprising: