JPH07134569A - Signal processor - Google Patents

Abstract

PURPOSE:To provide a means capable of reducing the number of signal processing means and the number of adjustment of a delay amount at the time of inversion/noninversion at every signal path in a signal processor when respective video information are displayed using two liquid crystal displays(LCD) e.g. in a head mount type display. CONSTITUTION:This signal processor is constituted of first, second signal sourses 1, 2 for generating respective video signals, an inversion means 7 for inverting one side of these video signals and a first selection means 8 selectively supplying one side of the video signals to the inversion means 7, first, second display means 3, 4 for converting the video signals to optical signals respectively and a second selection means 9 for selectively supplying the inverted or noninverted video signal by the inversion means 7 to the display means 3, 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a signal processing device for displaying signals from two signal sources on two display devices, respectively.

[0002]

2. Description of the Related Art Conventionally, a liquid crystal display (hereinafter, LCD
In order to prevent image burn-in of the pixel due to the DC component of the video signal, the method of inverting the polarities of the video signal and the voltage of the common electrode at regular intervals is used in the LCD. It is used. In addition, a head-mounted display that uses two LCDs to display video information for the right and left eyes on each LCD has also been proposed. However, when two LCDs are used, it is necessary to invert the video signal in each signal path at a constant cycle, and there is a method of switching each signal path by providing signal processing means for inversion or non-inversion. A method is provided in which a signal processing means capable of switching the polarity between inversion and non-inversion is provided in the signal path and the polarity of the video signal is switched by switching the polarity of this signal processing means.

[0003]

However, in the prior art as described above, for example, in the method of providing signal processing means for inversion and non-inversion, the number of signal processing means becomes too large. In the method of providing the signal processing means capable of switching between inversion / non-inversion and switching the polarity, it is necessary to adjust the delay amount at the time of inversion and at the time of non-inversion in each signal processing means.

The present invention has been made in consideration of the problems of the prior art in the signal processing apparatus as described above. The number of signal processing means can be reduced and the number of delay time adjustments at the time of inversion / non-inversion can be adjusted. The purpose is to provide a means to reduce.

[0005]

Therefore, in the present invention, a signal processing apparatus of this kind is provided with first and second signal sources for generating first and second video signals, respectively. Inverting means for inverting one of the first and second video signals, first selecting means for selectively supplying one of the first and second video signals to the inverting means, and The first and second display means for converting the first and second video signals into optical signals respectively, the video signal inverted by the inversion means and the other non-inverted video signal are selectively output by the first A second selection means for supplying the first and second display means respectively, and one of the first and second video signals is selectively inputted to the inversion means by the first selection means. The polarity is inverted by the inversion means, and the polarity inversion video signal and the inverse A non-inverted video signal that does not pass through the means is selectively supplied to the first and second display means by the second selection means, and after a predetermined time elapses, the video signal input to the inversion means is switched. Accordingly, the inversion means is configured to be shared by the two video signal paths, thereby achieving the above object.

[0006]

With the configuration of the present invention as described above, the respective signal paths between the first and second signal processing means for generating the first and second video signals and the first and second display means. Inverting means for inverting a video signal, and the first and second
First selecting means for selectively supplying the video signal from the signal source to the inverting means, and for selectively supplying the video signal from the inverting means to the first and second display means. By providing the second selecting means, the video signal supplied to the inverting means is switched to the first and second video signals at predetermined time intervals, and the video signal from the inverting means is switched to the first video signal. When inverted, the second display is displayed on the first display means.
In the case of a video signal, the number of inverting means is reduced by sharing one inverting means in two signal paths by the second selecting means selectively supplying to the second display means, and inverting / non-inverting The device can be simplified by reducing the number of adjustments of the delay time at the time of inversion.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on a plurality of embodiments; (Embodiment 1) FIG. 1 shows a first embodiment of the signal processing apparatus according to the present invention.
The block diagram of a structure of an Example is shown. In FIG. 1, 1 is
The first signal source 2 for outputting the first video signal,
The second signal source 3 for outputting the second video signal,
First display means for displaying the video signal of the first signal source 1, 4 is second display means for displaying the video signal of the second signal source 2, and 5 is the first display. A first driver 6 for supplying a video signal to the means 3 is a second driver 6 for supplying a video signal to the second display means 4.
Is an inverting means for inverting the video signals from the first or second signal sources 1 and 2, and 8 is an inverting means 7 for selectively inverting the video signals from the first or second signal sources 1 and 2. First selecting means 9 for inputting to the first driver 5 and second selecting means 9 for selectively supplying the video signal inverted by the inverting means 7 to the first driver 5 and the second driver 6, 10
Is a control unit (control means) for counting the horizontal scanning signals of the signal sources 1 and 2 and controlling the operations of the first selecting means 8 and the second selecting means 9.

Next, the operation of the first embodiment will be described.
First, first and second video signals are output from the first and second signal sources 1 and 2, respectively. Next, the control unit 10 counts the horizontal scanning signals of the respective video signals input from the signal sources 1 and 2, and when it is determined that the line is an odd-numbered row, the first selection unit 8 is set to each contact b. , D side to connect the first video signal to the inverting means 7, and at this time, the second video signal is not input to the inverting means 7 but directly to the second selecting means 9. And the reversing means 7
The polarity of the first video signal input to is inverted and output to the second selecting means 9. Next, the second selection means is connected to the respective contacts f and h, and the inverted first video signal is input to the first driver 5 and the second video signal is input to the second driver 6. , And are supplied to the first and second display means, respectively.

Further, when the control section 10 counts the horizontal scanning signals and determines that the number of rows is even, the first selecting means 8 is connected to the contact points a and c to output the second video signal. It is input to the inverting means 7, and at this time, the first video signal is directly input to the second selecting means 9 without being input to the inverting means 7. Then, the second video signal input to the inverting means 7 has its polarity inverted and is output to the second selecting means 9. Next, the second selecting means 9 is connected to the contact points e and g, the first video signal is input to the first driver 5, and the inverted second video signal is input to the second driver 6. ,
It is supplied to the first and second display means 3 and 4, respectively. However, if the first and second signal sources 1 and 2 are not synchronized when the horizontal scanning signal is counted in the control unit 10, feedback is provided to the first and second signal sources to synchronize. Take

As described above, by switching the signal input to the inverting means 7 for each row, one inverting means 7 can be shared by two signal paths.

The switching of the video signal input to the inverting means 7 may be performed not only for each row but also for a plurality of rows, for each row, randomly, for each pixel, for each pixel, or the like. In any of the methods, the number of rows (pixels) inverted by the control unit 10 is counted, and the number of rows (pixels) inverted and the number of rows (pixels) that are not inverted in screen units.
The ratio of may be the same. In the case of inverting each pixel, similarly, the number of pixels that are inverted and the number of pixels that are not inverted may be the same for each row, or the screen may be divided into a plurality of blocks and the number of pixels to be inverted for each block may be the same. And the number of non-inverted pixels may be the same.

(Embodiment 2) Next, FIG. 2 shows a configuration block diagram of a second embodiment of the signal processing apparatus according to the present invention. In FIG. 2, reference numerals 1 to 7 and 10 denote the same (corresponding) constituent elements as in the first embodiment, and the duplicated description of each is omitted. In the second embodiment, the contact points a and e of the first and second selecting means 8 and 9 and the d and h contacts of the first embodiment are
The first and second delay means 11 and 12 for the video signal having the same delay time as that of the inverting means 7 are provided.
Reference numeral 8 is a first selecting means for selectively inputting the video signal from the first or second signal source 1 or 2 to the inverting means 7 and each delay means 11 or 12, and 9 is an inverting means 7. It is a second selection means for selectively supplying the inverted video signal and the video signal delayed by the respective delay means 11, 12 to the first driver and the second drivers 5, 6.

Next, the operation will be described. First, first and second video signals are output from the first and second signal sources 1 and 2, respectively. Next, when the control unit 10 counts the horizontal scanning signals of the respective video signals input from the signal sources 1 and 2, and it is determined to be an odd row,
Selecting means 8 is connected to each contact b, d side to input the first video signal to the inverting means 7, and at this time, the second video signal is not input to the inverting means 7 but to the delay means 12. To be done. The polarity of the first video signal input to the inverting means 7 is inverted and output to the second selecting means 9, and the second video signal input to the delay means 12 is the same as that of the inverting means 7. It is delayed by time and output to the second selecting means 9. Next, the second selecting means 9 is connected to the respective contacts f and h, and the inverted first video signal is supplied to the first driver 5
In addition, the second video signal is input to the second driver 6 and supplied to the first and second display means 3 and 4, respectively.

When the control unit 10 counts the horizontal scanning signal and determines that it is an even-numbered row, the first selecting unit 8 is connected to each contact a and c to invert the second video signal. , And at this time, the first video signal is not input to the inverting means 7 but to the delay means 11. And
The polarity of the second video signal input to the inverting means 7 is inverted and output to the second selecting means 9, and the delay means 1 is also provided.
The first video signal input to 1 is delayed by the same time as the inverting means 7 and output to the second selecting means 9. Next, the second selecting means 9 is connected to the contact points e and g, and
Is input to the first driver 5, and the inverted second video signal is input to the second driver 6, respectively.
It is supplied to the second display means 3 and 4, respectively. However,
If the first and second signal sources 1 and 2 are not synchronized when the horizontal scanning signal is counted in the control unit 10, the first and second signal sources 1 and 2 are fed back and synchronized. Take

As described above, by switching the signal input to the inverting means 7 for each row, it is possible to supply one inverting means 7 through two signal paths.

The switching of the video signal input to the inverting means 7 may be performed not only for each row but also for a plurality of rows, for each row, randomly, for each pixel, for each pixel, or the like. In any of the methods, the number of rows (pixels) inverted by the control unit 10 is counted, and the number of rows (pixels) inverted and the number of rows (pixels) that are not inverted in screen units.
The ratio of may be the same. Further, in the case of inverting each pixel, similarly, the number of pixels that are inverted and the number of pixels that are not inverted may be the same in each row, or the screen may be divided into a plurality of blocks and the number of inverted pixels may be set for each block. The ratio of the number of non-inverted pixels may be the same.

(Third Embodiment) FIG. 3 shows a block diagram of the configuration of a third embodiment of the signal processing apparatus according to the present invention.
In FIG. 3, reference numerals 1 to 7 represent the same (corresponding) constituent elements as those in the first and second embodiments, and a duplicated description thereof will be omitted. 8A is a first selecting means for selectively inputting the video signals from the first or second signal sources 1 and 2 to the inverting means 7 and the delay means 11, and 9A is inverted by the inverting means 7. Second selection means 10 for selectively supplying the video signal and the video signal delayed by the delay means 11 to the first driver and the second drivers 5 and 6.
A is a control unit (control means) for counting the horizontal scanning signals of the signal sources 1 and 2 and controlling the operations of the first selecting means 8A and the second selecting means 9A, and 11 is the same as the inverting means 7. It is a delay means having a delay time.

Next, the operation will be described. First, first and second video signals are output from the first and second signal sources 1 and 2, respectively. Next, when the control unit 10A counts the horizontal scanning signal of each of the video signals input from the signal sources 1 and 2, and it is determined that the line is an odd line,
The first selecting means 8A is connected to the contact points b and d to connect the first video signal to the inverting means 7 and the second video signal to the delay means 11.
Entered in. Then, the polarity of the first video signal input to the inverting means 7 is inverted and the second video signal is input to the second selecting means 9A.
The second video signal output to the second selecting unit 9A is delayed by the same time as the inverting unit 7 and is output to the second selecting unit 9A. Next, the second selecting means 9A is connected to the respective contacts f and h, and the inverted first video signal is sent to the first driver 5, and the delayed second video signal is sent to the second driver 6. Is input to the first and second display means 3 and 4, respectively, and displayed.

When the control section 10A counts the horizontal scanning signals and determines that the number of rows is even, the first selecting means 8A is connected to the contact points a and c to invert the second video signal. 7, the first video signal is input to the delay means 11. The polarity of the second video signal input to the inverting means 7 is output to the second selecting means 9A and the first video signal is input to the delay means 11 as in the odd-numbered rows. Is delayed by the same time as the inverting means 7 and output to the second selecting means 9A. Next, the second selecting means 9A is connected to each contact i, j side, and the delayed first
Is input to the first driver 5, and the inverted second video signal is input to the second driver 6, respectively.
It is supplied to the second display means 3 and 4, respectively. However,
When the first and second signal sources 1 and 2 are not synchronized when counting the horizontal scanning signal in the control unit 10A, feedback is applied to the first and second signal sources 1 and 2. Synchronize.

As described above, by switching the input destination of the first and second video signals to the inversion means 7 and the delay means 11 for each row, one inversion means 7 and delay means 11 are connected to two signal paths. It is possible to share with.

The switching of the video signal input to the inverting means 7 may be performed not only for each row, but also for a plurality of rows, for each row, randomly, for each pixel, for each pixel, or the like. In either method, the control unit 10A counts the number of inverted rows (the number of pixels), and makes the ratio of the number of inverted rows (the number of pixels) and the number of the non-inverted rows (the number of pixels) the same for each screen. Is also good. In the case of inverting each pixel, similarly, the number of pixels that are inverted and the number of pixels that are not inverted may be the same for each row, or the screen may be divided into a plurality of blocks and the number of pixels to be inverted for each block may be the same. The ratio of the number of non-inverted pixels may be the same.

[0022]

As described above, according to the present invention,
By switching the signal input to the inverting means for each row,
One inversion means can be shared by two signal paths, and one inversion means and delay means can be provided by switching the input destination of the first and second video signals to the inversion means and delay means for each row. Can be shared by two signal paths, and the number of signal processing means or the number of delays at the time of inversion / non-inversion can be reduced to simplify the device.

[Brief description of drawings]

FIG. 1 is a configuration block diagram of a first embodiment.

FIG. 2 is a configuration block diagram of a second embodiment.

FIG. 3 is a configuration block diagram of a third embodiment.

[Explanation of symbols]

 1, 2 Signal Sources 3, 4 Display Means 5, 6 Driver 7 Inversion Means 8, 8A, 9, 9A Selection Means 10, 10A Control Unit (Control Means) 11, 12 Delay Means

Claims (10)

[Claims] 1. A first and a second signal source for respectively generating a first and a second video signal, an inverting means for inverting one of the first and the second video signals, and First,
First selecting means for selectively supplying one of the second video signals to the inverting means, and first and second selecting means for converting the first and second video signals into optical signals, respectively. Display means and second selection means for selectively supplying the video signal inverted by the inversion means and the other non-inverted video signal to the first and second display means, respectively.
One of the first and second video signals is selectively input to the inverting means by the first selecting means, the polarity thereof is inverted by the inverting means, and the polarity inversion video signal and the inverting means are used. A non-inverted video signal and a non-inverted video signal are selectively supplied to the first and second display means by the second selection means,
Further, the signal processing device is configured such that the inverting means is shared by the two video signal paths by switching the video signal input to the inverting means after a lapse of a predetermined time. 2. A delay means having the same delay time as that of the inverting means is added, and one of the first and second video signals is inputted to the inverting means by the first selecting means, and the other is inputted to the inverting means. 2. The signal processing means according to claim 1, wherein the inverting means is shared by selectively inputting it to the delay means, and the time lag due to passing through the inverting means is eliminated. 3. The signal processing device according to claim 1, wherein the video signal input to the inverting means is switched by the first selecting means every row. 4. The signal according to claim 1, wherein the video signal input to the inverting means is switched by the first selecting means every two or more rows. Processing equipment. 5. The signal processing apparatus according to claim 1, wherein the cycle of switching the video signal input to the inverting means by the first selecting means is random on a row-by-row basis. . 6. A counter for counting the number of rows inverted by said inversion means is provided, and the ratio of inverted rows and non-inverted rows is made the same.
The signal processing device according to any one of 2, 3, 4, and 5. 7. The signal processing device according to claim 1, wherein a cycle in which the video signal input to the inverting means is switched by the first selecting means is set for each pixel. 8. The signal according to claim 1, wherein a cycle at which the video signal input to the inverting means is switched by the first selecting means is set every two or more pixels. Processing equipment. 9. The signal processing apparatus according to claim 1, wherein a cycle in which the video signal input to the inverting means is switched by the first selecting means is random on a pixel-by-pixel basis. . 10. A counter for counting the number of pixels inverted by said inversion means is provided, and the ratios of the inverted pixels and the non-inverted pixels are the same. , 9. The signal processing device according to any one of claims 9 and 10.