TWI502991B - Method for compensating video signal delay and the device thereof - Google Patents

Description

Image signal delay compensation method and device thereof

The invention relates to a signal compensation method and a device thereof, and in particular to a signal signal delay compensation method and device thereof for signal delay.

The analog image signal is limited by the structure of the signal transmission line used, and it is easy to generate a situation in which multiple image signals cannot be synchronously reached to the display device, resulting in low quality of the image.

Currently, there are devices on the market for compensating the image signals, including providing an operation interface for the user to adjust the transmission time of each image signal one by one. Since not every user can adjust all the image signals to a consistent time output at a time, it is often necessary to rely on the user's experience. It is necessary to repeatedly fine-tune the delay time of each image signal according to the result of manual adjustment, which is easy to consume the user. time.

There is also an automatic adjustment device that automatically detects and adjusts the transmission time of each image signal. However, the means for fully adjusting and compensating the transmission time of the image signal is not adjusted based on the user's visual perception, so it is prone to incomplete accuracy. The issue of compensation continuation.

The embodiment of the present invention provides a video signal delay compensation method, which uses a control unit and a delay module to control a plurality of image signals having different transmission times. The image signals include a first image signal, a second image signal, and a third image signal. The method includes: receiving a first control command, and extending a transmission time of at least one of the first image signal and the second image signal within a delayable range according to the first control command to enable the first image signal and the second image The output time of the signal is the same as the first time, and then the operation command is used, the operation command is used to indicate that the output time of the third image signal is extended or shortened to the second time, so that the output time of the third image signal is the same. The output time of the image signal and the second image signal are the same; the operation command is analyzed and the second control command is generated according to the second time and the delay range; and the third time is adjusted from the second time according to the second control command. The transmission time of the image signal is such that the output time of the third image signal is the same as the first time, or the transmission time of the first image signal and the second image signal is adjusted from the first time within the delay range, so that the first image signal and The output time of the second image signal is the same as the second time.

In addition, the embodiment of the invention further provides a signal delay compensation device for performing the above method, comprising a plurality of delay circuits, a control unit and an operation unit. The delay circuit is used to control a plurality of image signals having different transmission time lengths. The image signal includes a first image signal, a second image signal, and a third image signal, and the delay circuit includes a first delay circuit for adjusting the first image signal, a second delay circuit for adjusting the second image signal, and an adjustment The third delay circuit of the three video signals. The control unit generates a first control command to control the first delay circuit and the second delay circuit to respectively extend the transmission time of at least one of the first image signal and the second image signal to the first time, and receive an operation command to generate the second control commands. The operation unit corresponds to the delay circuit for accepting an operation instruction for shortening or lengthening the transmission time of the third image signal from the second time. The control unit adjusts the transmission time of the third image signal from the second time according to the second control command, so that the output time of the third image signal is the same as the first time, or the first image signal and the second image signal are adjusted from the first time. The transmission time is such that the output time of the first image signal and the second image signal is the same as the second time.

In summary, the image signal delay compensation apparatus and method provided by the embodiments of the present invention can quickly correct the problem that multiple image signal outputs are out of sync, and automatically adjust relatively when the user manually adjusts and still cannot fully synchronize. The delay time of each image signal is used to eliminate the output time difference between the image signals to achieve the effect of maintaining image display quality.

[Image signal delay compensation device embodiment]

Please refer to FIG. 1. FIG. 1 is a block diagram of an embodiment of an image signal delay compensation apparatus according to the present invention. The image signal delay compensation device 1 (hereinafter referred to as the compensation device 1) includes a delay module 10, a control unit 12, and an operation unit 14. The delay module 10 can include a plurality of delay circuits. In the present embodiment, three are illustrated as an example, including a first delay circuit 100, a second delay circuit 102, and a third delay circuit 104. The delay module 10 and the operation unit 14 are respectively connected to the control unit 12. The compensating device 1 of the present embodiment can compensate and correct the three sets of image signals by using the three sets of delay circuits 100, 102 and 104 one-to-one, and cause the output time difference when the image signal is transmitted to the display device 2 due to different transmission distances. The three sets of image signals v1, v2, and v3 are respectively R, G, and B color signals of the video image array (VGA). For convenience of explanation, the three sets of image signals are referred to as a first image signal v1, a second image signal v2, and a third image signal v3, respectively.

After the plurality of video signals v1 to v3 are output from the signal source, the time of each arrival of the display device 2 is affected by the difference in the transmission distance. The transmission time of the image signal with the longest transmission distance is also the longest, so that the corresponding time is long. The image signal arrives at the display device 2 at the latest. In other words, since the pixels converted by the image signal are output from left to right on the panel of the display device, the image of the signal outputting the later time is shifted to the right, and the signal appearing earlier in the output time The right position of the image screen. Generally, in the case where the transmission distance is not changed, the transmission time of the image signal arriving at the latest display device 2 cannot be shortened, and therefore, the method of outputting the image signal in advance cannot be utilized, and the transmission time is short. The other image signals are synchronously output to the display device 2.

At this time, the control unit 12 can be used to control any one of the delay circuits 100 to 104 to extend the transmission time of the image signal with a short transmission distance within a limited delay range, so that the image signal with a shorter transmission time is corresponding. The delay circuit is delayed, and waits for output with the image signal with the longest transmission time, so that the multiple image signals whose original output time is inconsistent can be synchronized at the same time point output, and the display quality of the image screen on the display device 2 is maintained. .

The operating unit 14 is operable by the user to generate an operation command for indicating an image signal that the user specifies to adjust the transmission time, how to adjust the image signal, and the user to The degree to which the image signal is adjusted.

For the sake of understanding, please refer to the schematic diagram of the embodiment of the compensation device 1a shown in FIG. 2. The compensation device 1a can be provided with an operation unit 14a for adjusting the transmission time of the image signal, a signal input connector 16 for receiving the input signals v1_in, v2_in, v3_in (see FIG. 1) for respectively receiving the image signal, and for The signal output connector 18 outputted by the output signals v1_out, v2_out, and v3_out of the synchronized image signal. The signal output connector 18 can be connected to the image input unit 20 of the display device 2 via a signal line to transmit an output signal to the display device 2. The images displayed on the display device 2 correspond to the output signals v1_out, v2_out and v3_out output by the compensation device 1a, respectively, corresponding to the foregoing examples, namely R, G, B color signals 22, 24 and 26.

If the transmission time of the image signal with different transmission distances is not adjusted by the compensation device 1a, the image image presented on the display device 2 may be as shown in FIG. 2, and the image signals v1, v2, and v3 are not synchronously output, and the image signal v3 is The output time is later than the image signal v2, and the output time of the image signal v2 is later than the image signal v1, causing the display positions of the color signals 22 to 26 to be shifted. In this embodiment, the transmission time of each image signal (in this example, at least the transmission time of the two image signals needs to be adjusted) is required to be transmitted through the compensation device 1a, so that the color signal 22 displayed on the display device 2, Finally, 24 and 26 can simultaneously overlap the screen shown in the schematic diagram of FIG. 3 to present a clear and correct RGB signal 28.

With continued reference to FIG. 2, the operating unit 14a can be a mechanical or electronic component that can adjust the scale within a limited range, including one or more knobs, buttons, switches, or joysticks, each of which can be delayed with a delay. The circuit (not shown in Figure 2) corresponds to three knobs as illustrated in Figure 2. The operation command may be generated according to the magnitude of the rotation of the different knobs or the number of times the button (not shown in FIG. 2) is pressed. After the control unit receives and analyzes the adjustment mode indicated by the operation instruction, a control command for controlling the corresponding delay circuit may be generated. The corresponding delay circuit is proportionally increased by the delay time of the image signal or reduced by the delay time to change the transmission time of the image signal to the display device 2. The user can control the operation unit 14a according to the position displayed by the color signal on the display device 2, so that the control unit 12 controls the delay circuit to adjust the transmission time of the image signal according to the instruction generated by the operation unit 14a, thereby changing the output of the color signal on the display device 2. The position gradually reaches the effect of synchronously displaying the respective color signals.

In particular, the operation unit 14a can also be designed as a combined operating element, for example, including a selection unit for selecting different image signals, and another adjustment unit for adjusting the transmission time. However, the implementation means of the operation unit is not limited to the above-mentioned exemplary manners, and those skilled in the art can make various changes and designs according to the setting purpose of the operation unit and the functions to be achieved.

Referring to FIG. 1 again, for example, if the delay ranges of each of the image signals v1, v2, and v3 are 0 nanoseconds (ns) to 60 nanoseconds, respectively, the control unit 12 can determine that the operation unit 14 is operated by the user. The generated operation command and the corresponding delay circuit are controlled to delay the output of the image signal according to the delay seconds calculated by the control unit 12. In other words, in this example, the transmission time of each video signal is the shortest for each initial transmission time, that is, the condition of not delaying the transmission time; the longest period can be delayed until the initial transmission time plus 60 nanoseconds before outputting. The delay range is not limited to the above examples, nor does it limit the delay range of each video signal to be the same.

In this embodiment, the control unit 12 can extend the transmission time of the specific image signal according to the operation instruction, and the control delay circuit extends the transmission time of the image signal with a short transmission time, and the operation instruction indicates the specific image signal. The transmission time is shortened, but when the transmission time of the indicated image signal cannot be shortened, the control unit 12 can further automatically change the transmission time of other video signals with shorter transmission time to achieve the effect of synchronizing the image signals.

For example, please refer to the signal display position diagram of FIG. 4A and the image signal timing diagram corresponding to FIG. 4B. When the uncorrected image signals v1 to v3 shown in FIG. 4A are displayed on the display device 2, the color signal 22 appears on the right side of the color signal 24, and the color signal 26 appears on the right side of the color signal 22. It can be seen that the shortest initial transmission time of the three sets of image signals in FIG. 4A is the second image signal v2, and the longest is the third image signal v3. When the user adjusts the delay compensation of the three sets of image signals (that is, adjusts the three sets of signals synchronously), the first two sets of image signals v2 and v1 can be synchronized first. For example, an operation unit corresponding to the second image signal v2 (refer to FIG. 2) is operated to generate an operation instruction for indicating that the second image signal v2 is to be delayed. The control unit of the compensation device (refer to FIG. 1) can analyze the operation command and generate a corresponding first control command for controlling the second delay circuit 102 to extend the transmission time of the second image signal v2 to make the second image signal v2 The output time is the same as the output time of the first video signal v1. The user can determine whether the image signals v1 and v2 have been synchronized by using the display positions of the color signals 22 and 24 that change with the adjustment on the display device 2. Certainly, the first image signal v1 and the second image signal v2 may also be delayedly outputted by the first delay circuit 100 and the second delay circuit 102 to the same first time by the control of the first control command, so as to be closer to the output. The third image signal v3 at the latest is shown in Fig. 4B. In FIG. 4B, the first video signal v1 is delayed by t1 nanoseconds by the first delay circuit 100, and the second video signal v2 is delayed by t2 nanoseconds by the second delay circuit 102, and the transmission time is simultaneously extended to the first time td1. That is, the video signals v1 and v2 are synchronously output to the display device after the time length of the first time td1 is transmitted.

Then, when the third image signal v3 in FIG. 4A is synchronized with the synchronized image signals v1 and v2, the user may operate the operation unit corresponding to the third image signal v3 to generate an indication to shorten the third image. The transmission time of the signal v3 is such that the third video signal v3 outputs the time from the second time td2 to the premature operation command, and the control unit generates a corresponding second control command according to the instruction of the operation instruction, thereby controlling the appropriate delay. The circuit adjusts the transmission time of the image signal. However, since the initial output time of the third image signal v3 is limited by the transmission distance, the image is originally later than the image signals v1 and v2, and the third image is not extended by the third delay circuit 104. The transmission time of the signal v3 can no longer be reduced from the second time td2. Therefore, when the above operation command is received and it is determined that the third video signal v3 cannot be output in advance, the second control command generated by the control unit controls the previous control. The synchronized video signals v1 and v2 are again extended by the first delay circuit 100 and the second delay circuit 102 within the remaining delay range (in this example, the t3 nanosecond shown in FIG. 4B is extended) Until the output time of the image signals v1 and v2 is the same as the second time td2 of the third image signal v3 (ie, the initial transmission time of the third image signal v3 in this example).

By the judgment and automatic adjustment of the control unit 12, the three sets of image signals v1 to v3 need only be adjusted a total of two times, so that the effects of simultaneously outputting the three sets of image signals can be achieved, and it is not necessary to match the uncorrected image signals. The synchronized image signal is changed to reduce the number of times the user repeatedly manipulates the operation unit 14 to manually adjust the image signal.

For additional explanation, please refer to the image signal diagram shown in FIG. 5A and the image signal time diagram shown in FIG. 5B. 4A and 4B illustrate that the last adjusted image signal is the delay compensation means for the image signal with the longest initial transmission time, and FIGS. 5A and 5B are used to illustrate that the last adjusted image signal is the image signal with the shortest initial transmission time. The means of delay compensation. As shown in FIG. 5A, before the three sets of image signals are unadjusted, the sequence of output to the display device 2 is sequentially the third image signal v3, the first image signal v1, and the second image signal v2. Referring to FIG. 5B, the control unit analyzes an operation command for adjusting the first image signal v1 and the second image signal v2, and generates a corresponding first control command to extend the transmission time of the image signals v1 and v2 by t1 nanoseconds and After reaching the first time td1 at t2 nanoseconds, the third delay circuit 104 may be controlled within the delay range by analyzing the content of the operation command upon receiving the operation instruction for extending the transmission time of the third video signal v3. The transmission time of the three video signals v3 is extended from the second time td2 until the transmission time of the third video signal v3 is the same as the first time td1 of the video signals v1 and v2 (in this example, the third video signal) V3 has extended a total of t3 nanoseconds as shown in Fig. 5B.

Please refer to Figure 6. Specifically, the last adjusted image signal (such as the third image signal v3) is the image signal with the longest initial transmission time, and the image signal v1 after t1 nanosecond and t2 nanosecond is delayed according to the first control command. When the first time td1 of v2 has exceeded the initial transmission time of the third video signal v3 (ie, the second time td2), the user can visually detect that the color signals 22 and 24 are offset from the color signal 26 from the display device. Right. At this time, the user can operate the operation unit to generate an operation instruction indicating that the transmission time of the third video signal v3 is extended. When the control unit receives the instruction to extend the transmission time of the third video signal v3, it is determined that the third video signal v3 can be delayed from the second time td2 to the later first time td1 to be output, so that the third video signal is output. The v3 is adjusted and outputted simultaneously with the first and second image signals v1 and v2; or the first delay circuit 100 and the second delay circuit 102 are controlled to reduce the delay time of the image signals v1 and v2, respectively, to shorten the image signal v1. The transmission time with v2 is the same as the second time td2 of the third video signal v3. In other words, in this example, the third video signal v3 may be delayed by t3 nanoseconds from the second time td2 by the third delay circuit to extend the transmission time of the third video signal v3 to the first time td1, or may be The first and second delay circuits respectively reduce the delayed first and second video signals v1 and v2 by t3 nanoseconds, respectively, and shorten the transmission time of the first and second video signals v1 and v2 to the second time. Td2. This also achieves the effect of synchronizing the three sets of image signals.

The compensating device 1 of the present embodiment can be connected to a source device of a video signal via a signal input connector 16, such as a video player (Video Player), via an internal control unit and a delay module, as shown in FIG. After the control processing, the image output signal that can be synchronously outputted by the signal output connector 18 is output to the display device 2 (such as a liquid crystal screen). In addition, the compensation device 1 can also be a module or component of various video image processing devices, for example, the compensation device 1 is disposed in a video switch, a video splitter, and a video extender. (Video Extender), Video Matrix or Multimedia Player.

[Image signal delay compensation method embodiment]

Please refer to the flowchart of an embodiment of the image signal delay compensation method shown in FIG. 7. The compensation method can be performed by using the compensation device 1 shown in FIG. 1, so please refer to FIG. 1 together.

First, an image screen outputted by a plurality of image signals that have not been subjected to correction compensation can be displayed on the display device 2 connected to the compensation device 1 (S701). Since the transmission distances of the plurality of image signals from the signal source to the display device 2 through the signal line are different, the initial transmission time of each image signal is not necessarily the same, and the signals arrive at the display device 2 inconsistently. therefore When a plurality of image signals that have not been subjected to the compensation correction are displayed on the display device 2, the display positions of the image signals may be different, and the transmission time is long, so that the image signals with a later output time are shifted to a shorter transmission time. The right side of the image signal.

The user can learn the sequence of the output times of the plurality of video signals according to the position of the image signal displayed on the display device 2, and operate the operation unit 14 provided by the compensation device 1 to generate an indication for one or An operation command for adjusting the transmission time of the plurality of video signals (S703). Specifically, the operation unit 14 can be three knobs as shown in FIG. 2, which respectively correspond to three image signals, including a first image signal v1, a second image signal v2, and a third image signal v3. It is assumed that the initial transmission time of the second video signal v2 is longer than the first video signal v1 in this example. The user can rotate the knob corresponding to the first image signal v1, and generate an operation command by the direction of the rotation of the control knob to instruct the extension of the transmission time of the first image signal v1 to delay the output time of the first image signal v1.

The control unit 12 connected to the operation unit 14 can analyze the indication corresponding to the operation instruction after the operation instruction is adjusted to extend or reduce the transmission time and the extent of the extension or reduction time (S705), and generate according to the analyzed indication. The corresponding first control command is used to control the corresponding delay circuit to delay the transmission of the image signal (S707), for example, to reduce the speed of the signal transmission or increase the waiting time before the signal is output to the display device 2. In the foregoing specific example, the control unit 12 may extend the indication of the transmission time of the first video signal v1 according to the operation instruction, and control the first delay circuit 100 corresponding to the first image signal v1 according to the amplitude of the rotation of the knob. The transmission time of the first image signal v1 may be gradually increased within the delay range to delay the time when the first image signal v1 reaches the display device 2 from the signal source. The first delay circuit 100 delays the output of the first image signal v1, and can be immediately reflected in the display position of the first image signal v1 corresponding to the display device 2, so that the user can change the position of the image signal on the display device 2 according to the position of the image signal. The operation command is continued until the first delay circuit 100 delays the output time of the first video signal v1 according to the control of the control unit 12, so that the output time of the second video signal v2 on the display device 2 is the same as the first time. . The first time in this example may be the initial transmission time of the second video signal v2. In other words, the display position of the first image signal v1 is corrected to overlap the display position of the second image signal v2.

In other implementations, the user can simultaneously or individually operate the knobs corresponding to the first image signal v1 and the second image signal v2, so that the control unit 12 generates the first control command to control the first delay circuit 100 and the second. The delay circuit 102 delays the transmission times of the first video signal v1 and the second image signal v2 to the first time, and the first time at this time may be later than the initial transmission time of the second image signal v2. In other words, the display positions of the first image signal v1 and the second image signal v2 outputted to the display device 2 at the same time by the delay of the delay circuit are shifted to the right before the correction of the second image signal v2. .

After the first and second image signals have been synchronized, the user can control the operation unit 14 for the third image signal v3 to generate another operation instruction for indicating the output time of the third image signal v3 and the corrected time. The output times of the first and second video signals are synchronized (S709). In the above example, the user can rotate the knob corresponding to the third image signal v3 to generate the operation command by the direction and magnitude of the rotation.

When the control unit 12 receives an operation command for synchronizing the third image signal v3 with another image signal, it can analyze whether the operation command indicates that the transmission time of the third image signal v3 is shortened, so that the third image signal is shortened. The output time of v3 is advanced (S711).

It is assumed that the initial transmission time before the third video signal v3 is uncorrected in this example is shorter than the first time when the first video signal v1 and the second video signal v2 are output together, and the operation command generated by the user can be extended for the indication. The transmission time of the third image signal v3 is such that the output time of the third image signal v3 is the same as the first time, and the display position on the display device 2 can be shifted to the right to the first image signal v1 and the adjusted first The two video signals v2 overlap. Therefore, when the operation command for adjusting the third video signal v3 does not indicate that the transmission time of the third video signal v3 is shortened (ie, the result of the determination in step S711 is NO), the control unit 12 may generate the second control according to the instruction of the operation instruction. The command is used to control the third delay circuit 104 corresponding to the third video signal v3 to extend the transmission time of the third video signal v3 to delay the time when the third video signal v3 is transmitted to the display device 2 (S713).

In the process of controlling the third delay circuit 104 to delay the output time of the third video signal v3, it can be determined whether the third video signal v3 has been delayed by the change of the display position of the immediately reflected video signal on the display device 2. The output times of the first and second video signals that can be synchronously output are the same (S715). If the display position of the third image signal v3 on the display device 2 overlaps with the display position of the first and second image signals, it means that the output times of the three sets of image signals have been consistent, that is, they are all output at the first time; When the display position of the third image signal v3 is still different from the display position of the first and second image signals, the output time of the three sets of image signals is not synchronized. If the output time of the third video signal v3 has not been synchronized with the first time of the first and second video signals (ie, the determination result of step S715 is NO), then returning to step S713 to continue the operation generated by the user control operation unit 14 The instruction continues to delay the output time of the third video signal v3 until the result of the determination in step S715 confirms that the output time of the third video signal v3 is the same as the output time of the first and second video signals (ie, step S715). The judgment result is YES), and thus the correction of the output timing of the three sets of image signals is completed (S717).

Going back to step S711, it is assumed that the output time of the third video signal v3 in this example is later than the first image signal v1 and the second image signal v2 corrected first from the display position of the image signal on the display device 2. The operation command generated by the user can be used to indicate that the transmission time of the third video signal v3 is shortened (ie, the determination result in step S711 is YES), so that the output time of the third video signal v3 can be the same as the first time, and The display position on the display device 2 can be shifted to the left to overlap with the adjusted first image signal v1 and second image signal v2.

When the control unit 12 receives an operation command indicating that the transmission time of the third video signal v3 is shortened, it can be determined that the transmission time of the third video signal v3 is limited by the transmission distance being no longer reduced. At this time, the control unit 12 can generate the second control command, and control the first delay circuit 100 and the second delay circuit 102 to extend the transmission time of the previously synchronized first video signal v1 and the second image signal v2. (S719), that is, the output time is delayed from the first time to the back.

The first delay circuit 100 and the second delay circuit 102 delay the effects of the first image signal v1 and the second image signal v2, and can be known by the instant reaction on the display positions of the color signals 22 and 24 on the screen of the display device 2, and Thereby, it is judged whether or not the output times of the three sets of image signals v1 to v3 are synchronized (S721). Specifically, it is determined whether the color signals 22 and 24 on the display device 2 are shifted to the right to the display position of the color signal 26 to be displayed in an overlapping manner. If the output time of the three sets of image signals has not been completely synchronized, the process returns to step S719, and the control unit 12 continues to extend the first video signal v1 and the second according to the operation instruction indicating that the transmission time of the third video signal v3 is reduced. The transmission time of the video signal v2. Until the display of the three sets of color signals on the display device 2 is synchronously outputted at the second time by the delay of the delay circuit (ie, the determination result in step S721 is YES), the correction of the output time of the three sets of image signals is completed (S723). .

Therefore, the control unit 12 of the compensation device 1 can automatically adjust the delay time of the image signal after the user adjusts the image signal through the operation unit 14 regardless of whether the initial transmission time of each image signal is long or short. All image signals can be output synchronously on the display device to improve the display quality of the image.

[Possible efficacy of the embodiment]

According to the embodiment of the present invention, the image signal delay compensation method and system can automatically perform adaptive adjustment after the user performs a delay compensation operation of the image signal and the image signal is not completely eliminated. It can actively compensate and correct the last transmission time of each image signal, so that the user can quickly eliminate the problem that the image signal is out of sync and reduce the image output quality without repeating the adjustment.

In addition, according to an embodiment of the present invention, the control unit may execute a set of code to determine whether the image signal can reduce the transmission time, control the image signal to extend or reduce the transmission time, and determine whether the final output time of each image signal is the same. It can be output consistently for one time or the same time. The method does not require the compensation device to additionally configure the hardware component, and thus can be embedded in various image signal control products without increasing the production cost of the compensation device, and can also be fabricated as an independent compensation device.

The above description is only an embodiment of the present invention, and is not intended to limit the scope of the invention.

1,1a. . . Video signal delay device

10. . . Delay module

100. . . First delay circuit

102. . . Second delay circuit

104. . . Third delay circuit

12. . . control unit

14,14a. . . Operating unit

16. . . Signal input connector

18. . . Signal output connector

2. . . Display device

20. . . Image input unit

twenty two. . . Color signal

twenty four. . . Color signal

26. . . Color signal

28. . . RGB signal

V1. . . First image signal

V2. . . Second image signal

V3. . . Third image signal

Td1. . . first timing

Td2. . . Second time

S701-S723. . . Process step

1 is a block diagram of an embodiment of an image signal delay compensation apparatus provided by the present invention;

2 is a schematic diagram of an embodiment of an image signal delay compensation apparatus provided by the present invention;

FIG. 3 is a schematic diagram showing display of a corrected image signal by a display device according to an embodiment of the invention; FIG.

4A is a schematic diagram of an uncorrected image signal in the embodiment of the present invention:

FIG. 4B is a timing diagram of an image signal transmission time exemplified by the present invention; FIG.

FIG. 5A is a schematic diagram of an uncorrected image signal in another embodiment of the present invention; FIG.

FIG. 5B is a timing diagram of another image signal transmission time exemplified by the present invention; FIG.

FIG. 6 is a timing chart showing another transmission time of an image signal exemplified by the present invention; and

FIG. 7 is a flow chart of an embodiment of a method for compensating for image signal delay provided by the present invention.

S701-S723. . . Process step

Claims (11)

An image signal delay compensation method for controlling a plurality of image signals having different transmission times by using a control unit and a delay module, the image signals including a first image signal, a second image signal and a third image signal, the method comprising Receiving a first control command, and extending the transmission time of at least one of the first image signal and the second image signal within a delay range according to the first control command, so that the first image signal and the second The output time of the image signal is the same as the first time; receiving an operation command for instructing to extend or shorten the transmission time of the third image signal whose output time is a second time, so that the third image signal is The output time is the same as the output time of the first image signal and the second image signal; analyzing the operation command and generating a second control command according to the second time and the delayable range; and according to the second control command, Adjusting the transmission time of the third image signal from the second time in the delay range, so that the output time of the third image signal is Adjusting the transmission time of the first image signal and the second image signal from the first time, and outputting the first image signal and the second image signal to the first time The second time is the same. The image signal delay compensation method of claim 1, wherein the second control command extends the first image from the first time when the operation instruction instructs to shorten the transmission time of the third image signal The transmission time of the signal and the second image signal to the output time of the first image signal and the second image signal is the second time. The image signal delay compensation method of claim 2, wherein the second control command extends the third image from the second time when the operation command indicates that the transmission time of the third image signal is extended. The transmission time of the signal, the output time of the third image signal is the first time, or the transmission time of the first image signal and the second image signal is shortened from the first time, to the first image signal and The output time of the second image signal is the second time. The image signal delay compensation method according to claim 3, wherein the second time is an initial output time of the third image signal. The image signal delay compensation method of claim 1, wherein before receiving the first control command, the method further comprises: providing an operation unit and a display interface for a user to adjust an output time of the image signals, The display interface displays a picture outputted by the image signals according to corresponding output times; wherein the operation instruction is generated according to a result of the operation unit being operated. An image signal delay compensation device includes: a plurality of delay circuits for controlling a plurality of image signals having different lengths of time, wherein the image signals include a first image signal, a second image signal, and a third image signal. The delay circuit includes a first delay circuit for adjusting the first image signal, a second delay circuit for adjusting the second image signal, and a third delay circuit for adjusting the third image signal; a control unit generates a first control command to control the first delay circuit and the second delay circuit to respectively extend the transmission time of at least one of the first image signal and the second image signal to a first time, and receive an operation command to And generating a second control command; and an operation unit corresponding to the delay circuit for accepting the operation to generate the operation instruction, the operation instruction for indicating the transmission time of the third image signal from a second time Shortening or extending; wherein the control unit adjusts the transmission of the third image signal from the second time according to the second control command The output time of the third image signal is the same as the first time, or the transmission time of the first image signal and the second image signal is adjusted from the first time to make the first image signal and the second image The output time of the signal is the same as the second time. The image signal delay compensation device of claim 6, wherein the control unit generates the second control command to control the first delay circuit when the operation instruction indicates shortening the transmission time of the third image signal. And the second delay circuit extends the transmission time of the first image signal and the second image signal from the first time to the same time as the second time. The image signal delay compensation device of claim 7, wherein the control unit generates the second control command to control the third delay circuit when the operation command indicates that the transmission time of the third image signal is extended. Extending the transmission time of the third image signal from the second time to be the same as the first time, or generating the second control command to control the first delay circuit and the second delay circuit to reduce the first time from the first time The transmission time of the first image signal and the second image signal is the same as the second time. The image signal delay compensation device of claim 8, wherein the second time is an initial transmission time of the third image signal. The image signal delay compensation device according to claim 6, wherein the signal delay compensation device is disposed in a video switcher, a video distributor, a video extender, a video matrix or a multimedia playback device. . The image signal delay compensation device according to claim 6, wherein the operation unit is a plurality of knobs, a plurality of buttons or a plurality of switches.