JPH07312734A - Television receiver - Google Patents

Abstract

PURPOSE:To obtain a television receiver with a large screen size in which images of joints of adjacent picture tubes are not interrupted when usual picture tubes are used and one image is displayed on the plural television receivers arranged side by side. CONSTITUTION:An optical body 30 whose face viewed by the user is made flat is arranged in the front side of plural picture tubes 10, 20 arranged in the horizontal and vertical directions. Furthermore, light receiving elements 11, 12, 21, 22 are provided respectively to ends of the picture tubes 10, 20, the deviation in the display position is detected by the light receiving elements 11, 12, 21, 22 and a deflection circuit is controlled based on the detection signal to control the amplitude or the position thereby displaying divided video images to a flat part 33 of the optical body 30. Thus, the divided video images are displayed and the video image without a sense of incongruity is generated. Moreover, parts on which the light receiving elements 11, 12, 21, 22 are provided are shielded by shield plates 14-16 so as not to cause effect onto the video signal.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video display device in which a plurality of monitor devices using, for example, a picture tube are arranged horizontally and vertically and the monitor devices are used as one display device.

[0002]

2. Description of the Related Art FIG. 6 shows an arrangement example in which a plurality of monitor devices using picture tubes are horizontally and vertically arranged and used as one display device. In this example, three display devices are used in the horizontal and vertical directions, for a total of nine display devices. For the sake of convenience, each display device is distinguished from a, b, and c in the horizontal direction and A, B, and C in the vertical direction, and is shown as Aa to Cc, respectively.

As the individual monitor devices Aa to Cc, for example, a general color television receiver can be used. In that case, it is necessary to supply a television signal obtained by decomposing one video signal to each monitor device, and a special signal processing device is used.

FIG. 7 shows an example of the configuration of an apparatus for decomposing one video signal and converting it into a television signal which is a partially expanded video signal for each monitor.

In FIG. 7, first, a video signal (television signal) to be displayed on a plurality of display devices arranged side by side.
Is supplied to the television signal processing circuit 100, and is subjected to normal processing to output a luminance (Y) signal and color difference signals (RY, BY) to the terminals 120, 130, 140. These output signals are used for the digital signal processing circuits 200 and 30.
0,400 respectively. The internal configuration of the digital signal processing circuit is the same as that of 200, 300, and 400, and the operation will be described taking the digital signal processing circuit 200 for Y signal processing as an example. First, the Y signal is the A / D converter 22.
1 is converted into a digital signal by the field memory 222
Is recorded in. The field memory 222 is used to store the input television signal for one field. The memory control circuit 223 controls writing and reading of the field memory 222. It is possible to variously process one video signal written in the field memory 222 depending on the reading control method. These techniques are widely known and will not be detailed here. One video signal is partially enlarged to n in the horizontal direction.
In order to extract one image signal in the vertical direction and m image signals in the vertical direction, the image signal is extended in the horizontal direction by n times (the reading speed is slowed). Control is performed so that m scanning lines in the vertical direction have the same video signal. By setting the reading start position for each display device, one original image can be displayed on a plurality of screens. Latches 224, 225, 226, ... Are connected to the output terminals of the field memory 222. This latch group includes one field memory 222.
As described above, when n × m signals are taken out, it is impossible to take them out at the same time depending on the configuration of the field memory 222, so an example is shown in which the signals are taken out and latched by time division processing. Although omitted in the figure, the number of required latches is n × m.

The latched digital video signal is D / A
It is supplied to the converters 227, 228, 229, ... And made into analog signals. This D / A converter group is also n × m
Required individually (not shown in the figure). D / A converter 22
From 7, 228, 229, ..., Y signals obtained by partially enlarging one video signal are extracted.

For example, a Y signal corresponding to the location of Aa when the screen is constructed as shown in FIG. 6 is taken out from the D / A converter 227. Similarly, the digital signal processing circuits 300 and 400 output color difference signals RY and BY.
Is taken out. These signals are NTSC encoder 5
1 and is output from the terminal 61 as a standard television signal.

Although the NTSC encoder is omitted in FIG. 7, n × m encoders are required. NTSC encoder 52, 5
Similarly, signals for different monitors are taken out from 3, ... Output terminals 61 and 6 of each NTSC encoder
By connecting 2, 63, ... To a monitor group arranged as in the example of FIG. 6, one video signal can be divided and displayed on a plurality of screens.

By the way, in the conventional video display apparatus having a plurality of screens shown in FIG. 6, a television receiver is used for each monitor. Therefore, when the individual monitors are arranged adjacent to each other to form a large screen, the following problems occur.

Of the plurality of monitors shown in FIG. 6, a television receiver horizontally adjacent to each other will be described as an example.

FIG. 8 is a partially enlarged view of the picture tube portion of the television receiver arranged in the horizontal direction, and the fluorescent screens 31 and 41 are shown by thick lines.

In such a structure, when one image is continuously projected on the fluorescent screens (screens) 31 and 41, the screen is interrupted at the exposed portion of the glass surface 50 between the fluorescent screens 31 and 41. There's a problem. This is a picture tube 30,
It is inferred from the fact that it is difficult to form the fluorescent surface of the adjacent picture tubes 30 and 40 on the entire face in the production of the picture tube because the inside of the picture tube 40 is vacuum. See.

Further, when a plurality of such picture tubes are used, a problem such as convergence or distortion, which is a problem with one picture tube, becomes a further problem. In particular, in order to display one image on a plurality of picture tubes, horizontal or vertical position adjustment or horizontal / vertical amplitude adjustment is required in real time.

[0014]

As described above, the conventional video display apparatus having a plurality of screens has a problem that the video is interrupted at the adjacent portions arranged adjacent to each other.

The present invention provides a large-screen television receiver in which a normal picture tube is used, and when a plurality of pictures are displayed side by side to display one picture, the picture at the joint between adjacent picture tubes does not break. The purpose is to do.

[0016]

According to a first aspect of the present invention, there is provided a television receiver in which a plurality of picture tubes having curved fluorescent screens are arranged side by side and adjacent to each other, and each picture tube has a single display section. A signal processing means for dividing and supplying a video signal from one video signal source to display a magnified image and a front surface of the display portion are provided so as to face each other, and the surface on the side of each picture tube is the fluorescent screen. An optical body that is curved with substantially the same curvature as that of the other side and has a flat surface on the other side, and transmits an image from each picture tube to display it seamlessly. Is.

According to a second aspect of the present invention, there is provided the television receiver according to the first aspect, wherein the optical body has a thickness of a surface facing each picture tube from a central portion to a peripheral portion of each picture tube. It is characterized in that it has a shape that becomes thicker and has a different refractive index.

According to a third aspect of the present invention, there is provided the television receiver according to the first aspect, wherein the signal processing means controls the brightness displayed on each picture tube from the central portion of each picture tube to the periphery. It is characterized in that it comprises a brightness control means for controlling so as to gradually increase as it goes to the section.

According to another aspect of the present invention, there is provided a television receiver in which a plurality of picture tubes having curved fluorescent screens are arranged side by side and adjacent to each other, and a picture signal from a single picture signal source is supplied to each picture tube. Separately supplied, signal processing means for displaying an enlarged image, and provided to face the front surface of the display unit, the surface of each picture tube side is curved with a curvature substantially the same as the curvature of the fluorescent screen, The other surface has a planar shape, an optical body for transmitting and displaying an image from each picture tube, and a detection means for detecting a deviation of a scanning position between adjacent portions of each picture tube, Deflection control means for changing the image display position of each picture tube in response to the detection result from the detection means.

According to a fifth aspect of the present invention, in the television receiver according to the fourth aspect, the detecting means produces an additional image having a predetermined level at an end portion of the adjoining portion of each picture tube. As shown, a means for adding a detection signal to the video signal supplied to each picture tube, a light receiving means arranged at an end portion of an adjacent portion of each picture tube, for receiving the additional video light, And a means for calculating the deviation of the scanning position between the adjacent portions of the respective picture tubes based on the light receiving result of the light receiving means.

[0021]

According to the present invention, it is possible to join the images of the ends of adjacent picture tubes to each other, and the images viewed by the user are not interrupted. Further, it is possible to obtain a large-screen television receiver or a wide-angle horizontal television receiver without the need for special picture tube control technology.

[0022]

EXAMPLES Examples will be described with reference to the drawings. 1 is a block diagram showing the configuration of a television receiver according to the present invention, and FIG. 2 is a partially enlarged view of the configuration of the picture tube portion of FIG. Note that, in the block diagram of FIG. 1, for simplicity, only the configuration of one picture tube among a plurality of picture tubes is shown. As for the method of dividing the video, for example, the configuration of FIG. 7 can be used.

In FIG. 1, an integrated circuit for video / chroma / deflection processing (hereinafter referred to as video / chroma / deflection processing I)
C) 3). On the other hand, the detection signal from the detection signal generation circuit 2 is also supplied to the video / chroma / deflection processing IC 3. The detection signal generation circuit 2 generates a detection signal for detecting the deviation of the scanning position in the horizontal direction or the vertical direction.

The video / chroma / deflection processing IC 3 separates the chrominance signal and the luminance signal from the composite video signal and outputs the video signal to the video signal output circuit 4, and also performs the sync separation to synchronize the horizontal cycle and the vertical cycle. The signal is supplied to the deflection circuit 9. Also, a horizontal phase circuit (H / PHASE)
And a phase shift signal is supplied to the deflection circuit 9 in order to adjust the position of the image. In the video / chroma / deflection processing IC 3, the detection signal from the detection signal generation circuit is added to the video signal and output to the video signal output circuit 4.

The video signal output circuit 4 includes a video chroma
The picture tube 10 is driven based on the signal from the deflection processing IC 3. Further, a high voltage is supplied to the anode 18 of the picture tube 10 from the deflection circuit 9 via the flyback transformer FBT.

The picture tube 10 is provided with light receiving elements 11 and 12, respectively, at adjacent portions arranged adjacent to each other and at end portions facing the adjacent portions. This light receiving element 11, 12
Is composed of three light receiving elements arranged in the horizontal direction.

Here, the construction of the picture tube portion will be described in more detail with reference to FIG. FIG. 2 is a configuration diagram of a television receiver according to an embodiment of the present invention. In FIG. 2, the picture tubes 10 and 20 are provided with fluorescent screens 13 and 23, and an optical body 30 is arranged in front of the fluorescent screens 13 and 23. At the respective ends of the picture tubes 10 and 20, the light receiving elements 11, 12, 21 and 2 described above are respectively provided.
2 are provided, and the light receiving elements 11, 12, 21,
The detection signal is detected by 22.

The optical body 30 has a fluorescent screen 13, a fluorescent screen 13,
It has a curved surface according to the curvature of 23, and the side viewed by the user is constituted by a flat surface 33. The optical body 30
Is provided on the entire surfaces of the plurality of picture tubes, and the user sees the image projected on the plane 33 side.

The ends of the picture tubes 10 and 20 and the optical body 3
Since the detection unit is provided between 0, the light receiving elements 11, 12, 2
A transparent layer 31 is provided for assembling the 1, 2 and the shielding plates 14, 15, 16. This portion is made of, for example, a plastic material or the like, and is arranged so that the deflected beam has continuity in the plane portion 33. The shield plates 14, 15, 16 are made of a black material or the like.

The plurality of picture tubes 10 and 20 are normally arranged in a plurality of rows and columns as shown in the figure.
The case of individual pieces is explained. The signals detected by the light receiving elements 11 and 12 of the picture tube 10 thus configured are supplied to the detection signal processing circuit 5 of FIG. The detection signal processing circuit 5 processes the signal and supplies it to the microcomputer 6. Based on the two signals from the detection signal processing circuit 5, the microcomputer 6 discriminates the position shift of the image in the horizontal direction, and supplies a control signal to the video / chroma / deflection processing IC 3 and the deflection circuit 9. There is.
Upon receiving this control signal, the deflection signal whose horizontal amplitude and phase are controlled is supplied to the deflection yoke Ly. With these configurations, the horizontal amplitude and the image position are controlled.

Further, in the present embodiment, the control of the brightness of the image is also performed electrically, and this configuration will be described below. The flyback transformer FBT of the high-voltage circuit 7 is provided with a tertiary winding, in which a pulse of a horizontal period (1H) is taken out, and this pulse is further integrated to take out a parabolic waveform by an integrating circuit. This integrating circuit is composed of capacitors C1 and C2 and a resistor R1, and the brightness control voltage generating circuit 8 starts from the connection point of the capacitor C2 and the resistor R1.
The parabolic waveform of one horizontal period is supplied to the navel. The brightness control voltage generation circuit 8 generates a brightness control voltage based on this parabolic waveform and supplies it to the video / chroma / deflection processing IC 3. This video / chroma / deflection processing IC 3 outputs a video signal for controlling the brightness of the peripheral portion, and this signal is supplied to the video output circuit 4. The picture tube 10 is driven based on this signal, and the brightness is adjusted according to the parabolic waveform of the horizontal period.

The operation of FIG. 1 will be described with reference to FIGS. FIG. 3 corresponds to the signal waveform of each part of FIG. 1,
(A) is a signal added to the video signal to detect the positional deviation from the detection signal generating circuit, and (A) is (A).
The video signal to which the signal of is added is schematically shown. Further, (C) and (D) show the detection signals detected by the respective light receiving elements when the horizontal scanning is shifted to the left, and (E) and (F) show the horizontal direction. 6A and 6B schematically show respective detection signals when the scanning of 1 is shifted to the right.

Light receiving elements are provided around the picture tubes 10 and 20 (upper and lower end portions), and when the display position of the image is deviated, the amount of the deviation is fed back to correct the image position. Hereinafter, stabilization of the display position in the horizontal direction will be described with reference to FIG.

Detection signal A generated by the detection signal generation circuit 2
Is added to the video signal. The detection signal A has pulse-like waveforms formed at the ends of the horizontal period (FIG. 3).
(A)). This signal is generated so as not to affect the video signal, and is added to the video signal B by the video / chroma / deflection processing IC 3 and output (FIG. 3A). This signal is supplied to the picture tube 10 via the video output circuit 4, and is projected on the tube surface of the picture tube 10 based on the deflection signal from the deflection circuit 9.

On the other hand, at the end of the picture tube 10, the light receiving element 1
1, 12 are provided to detect the intensity of light emitted from the fluorescent screen of the picture tube 10. Figure 3 (c)
3A and 3D are cases where the shift is to the left, and FIGS. 3E and 3C are detection examples where the shift is to the right.

The detection method will be described in more detail below with reference to FIG. In FIG. 4, the light receiving element 11 and the light receiving element 12 are three light receiving elements 11a, 11b, 1 respectively.
1c and 12a, 12b, 12c. A shift to the right or to the left is detected according to the intensity of light detected by these three light receiving elements.

FIG. 4A shows a normal detection pattern, in which a peak is obtained in the central element, and a symmetrical detection pattern is obtained with the output of the central element as the center.
By processing this with a microcomputer, it is determined that the horizontal scanning is at a normal position.

Further, when it is shifted to the left, the detection pattern (a) is obtained. If this detection pattern is obtained,
The phase and amplitude of the deflection signal are controlled so that the horizontal scanning is returned to normal. This control is performed by the microcomputer 6, determines which of the signals from the detection signal processing circuit 2 is shifted in the horizontal direction, and supplies a control signal to the video / chroma / deflection processing IC 3 or the deflection circuit 9. After further adjusting the phase and the amplitude, this determination is repeated. The feedback loop is configured so that the microcomputer 6 determines the shift direction and always holds the normal position. Further, when it is shifted to the right side (the detection pattern of (c)), it is similarly controlled.

With such a configuration, the positional deviation of the divided screen can be corrected by controlling the phase and the amplitude, and the divided video can always be displayed at an appropriate position. The shielding plates 14, 15 and 16 are provided so that light rays do not leak from the detection signal, and the detection signal does not affect the video signal.

Further, in this embodiment, it is possible to control the "unevenness" of the brightness of the image caused by the transmission characteristics of the optical body. In this embodiment, this control is possible using the horizontal pulse from the flyback transformer FBT. Using this horizontal pulse, a brightness control signal synchronized with the horizontal cycle is generated. here,
A signal from the flyback transformer FBT is integrated to obtain a horizontal period parabolic waveform, and the brightness control voltage generation circuit 8 generates a brightness control voltage based on this signal,
It is supplied to the chroma / deflection processing circuit 3. As a result, if the brightness around the screen is increased, the "unevenness" of the brightness due to the difference in transmittance can be prevented. Although the horizontal direction has been described above, the same principle can be applied to the vertical direction.

Further, FIG. 5 shows an optical body 100 having a high refractive index, which is arranged in front of the picture tubes 10 and 20. This optical body 100 corresponds to each picture tube 1
The thickness of the surface facing 0, 20 becomes thicker from the central part to the peripheral part of each picture tube, and when transmitting the image light from the picture tube, the refractive index becomes larger toward the peripheral part. The display is such that there is no joint between the image lights from the respective picture tubes.

In this embodiment, the brightness control is realized by using the horizontal parabolic voltage and electrically controlling the brightness. However, as another embodiment, the brightness control is provided to the optical body itself. It is also possible to realize by. That is, by using an optical body in which the transmittance of the optical body changes according to the thickness (the higher the thickness of the optical body, the higher the transmittance), the transmission of light rays is controlled to obtain a constant brightness. May be obtained.

[0043]

As described above, according to the present invention, when an existing picture tube is used to display one picture by arranging a plurality of picture tubes, the picture of the joint between adjacent picture tubes is interrupted. There is no big screen television receiver. Also, multiple display devices may be ordinary television receivers, and a wide screen can be achieved with excellent cost performance by arranging multiple display devices side by side without modifying them and providing a projection screen including an optical body on the front surface. it can.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a television receiver according to the present invention.

FIG. 2 is a diagram showing a configuration of a picture tube portion of FIG.

FIG. 3 is a waveform diagram illustrating a detection method for detecting the positional deviation in the horizontal direction of FIG.

FIG. 4 is a diagram illustrating a configuration and a detection method of the light receiving element in FIG.

FIG. 5 is a diagram showing a configuration of a picture tube portion according to another embodiment of the present invention.

FIG. 6 is a view showing an arrangement example of monitor screens of a video display device in which a plurality of monitor devices are arranged to display one video signal.

7 is a block diagram showing a conventional example of a video display device for displaying one video signal on a plurality of screens as shown in FIG.

8 is a diagram showing a configuration of two picture tubes arranged horizontally as shown in the picture tubes arranged as shown in FIG.

[Explanation of symbols]

 2 ... Detection signal generation circuit 3 ... Video / chroma / deflection processing IC 5 ... Detection signal processing circuit 6 ... Microcomputer 8 ... Brightness voltage generation circuit 10, 20 ... Picture tube 11, 12, 21, 22 ... Photodetector 14- 16 ... Shielding plate 30 ... Optical body

Continuation of front page (51) Int.Cl. ⁶ Identification number Office reference number FI technical display area H04N 5/65

Claims (5)

[Claims] 1. A display unit comprising a plurality of picture tubes having curved fluorescent screens arranged side by side, and a picture signal from a single picture signal source is divided and supplied to each picture tube to provide an enlarged picture. A signal processing unit for displaying, provided facing the front surface of the display unit, the surface on the side of each picture tube is curved with substantially the same curvature as the curvature of the fluorescent screen, and the other surface has a planar shape. A television receiver, comprising: an optical body for transmitting an image from each picture tube and displaying the image seamlessly. 2. The optical body is such that the thickness of the surface facing each picture tube becomes thicker from the central portion to the peripheral portion of each picture tube,
The television receiver according to claim 1, wherein the television receiver has a shape having a different refractive index. 3. The signal processing means includes brightness control means for controlling the brightness of an image displayed on each picture tube so as to gradually increase from the central part of each picture tube to the peripheral part. The television receiver according to claim 1, characterized in that: 4. A display section in which a plurality of picture tubes having curved fluorescent screens are arranged side by side, and a picture signal from a single picture signal source is divided and supplied to each picture tube to display an enlarged picture. A signal processing unit for displaying, provided facing the front surface of the display unit, the surface on the side of each picture tube is curved with substantially the same curvature as the curvature of the fluorescent screen, and the other surface has a planar shape. An optical body for transmitting and displaying an image from each picture tube, a detection means for detecting a deviation of the scanning position between the adjacent portions of each picture tube, and a detection result from the detection means. And a deflection control means for changing the image display position of each picture tube, the television receiver. 5. The detection means adds a detection signal to a video signal supplied to each picture tube so that an additional picture having a predetermined level is displayed at an end of an adjacent portion of each picture tube. Means, a light receiving means arranged at an end of an adjacent portion of each picture tube to receive the additional image light, and a scanning position shift between the adjacent portions of each picture tube based on a light receiving result of the light receiving means. 5. The television receiver according to claim 4, further comprising means for calculating.