KR100793099B1 - Image Display Apparatus - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video display device, by using two or more different types when converting a video signal, thereby improving compatibility with other devices and easily applying various applications.

The video display device of the present invention converts a parallel video signal input from the outside into low voltage video data of two or more different types of serial low voltage video data and transmits the converted low voltage video data. Image data for supplying a low voltage image data receiving unit for receiving the low voltage image data and restoring the image signal and a video signal restored for the low voltage image data receiving unit to a video display panel through a switching operation. It is preferred to include a supply.

Description

Image Display Apparatus

1 is a diagram for explaining the configuration of a video display device of the present invention;

2 is a view for explaining an example of implementing the video display device of the present invention.

3 is a diagram for explaining low voltage image data used in the video display device of the present invention.

4 is a diagram for explaining a voltage drop during transmission and reception of low voltage video data.

FIG. 5 is a diagram for explaining a low voltage image data transmitter of a video display device of the present invention in more detail. FIG.

6 is a view for explaining an example of a more detailed configuration of an inverted signal generator in the video display device of the present invention.

7A to 7D are diagrams for explaining the data converter in more detail.

8 is a view for explaining an example of the configuration of a video display device of the present invention for reducing the number of buffers used.

Fig. 9 is a view for explaining another example of the configuration of the video display device of the present invention for reducing the number of buffers used.

<Explanation of symbols for the main parts of the drawings>

100: video display device 110: low voltage image data transmission unit

120: low voltage image data receiving unit

130: image data supply unit 140: image display panel

The present invention relates to a video display device.

The image display apparatus includes an image display panel and various drivers supplying predetermined image data to the image display panel.

Here, there are various types of image display panels, such as a liquid crystal display (LCD), a field emission display (FED), an organic EL (electroluminescense), a plasma display panel, and the like.

In a conventional image display apparatus including such an image display panel, an image signal is displayed on an image display panel by supplying an image signal supplied from an external device to an electrode formed in the image display panel.

Here, in order to supply an image signal supplied from the outside to the electrode of the image display panel, the image signal is converted into a predetermined type of image data and used. In addition, such a conventional image display apparatus may use any specific preset image at the time of conversion of the image signal. Use one approach.

For example, in order to improve signal transmission efficiency, such as to reduce distortion of an image signal, an image signal supplied from the outside is converted into low voltage differential signal (LVDS) type image data.

As described above, the conventional video display device has a problem in that it is difficult to be compatible with devices using other types by using only a predetermined type, for example, the above-described low voltage differential signal type, when converting the video signal.

For example, in the case of a video display device using low voltage differential signal type image data, it is difficult to be compatible with other devices that use reduced data differential type (RSDS) type image data.

As a result, the conventional video display device has a problem that it is difficult to apply a variety of applications (Application).

In order to solve the above problems, an image display device of the present invention has an object to provide a video display device that can use two or more different types when converting the video signal.

In order to achieve the above object, the video display device of the present invention converts a parallel video signal input from the outside into low voltage video data of two or more different types of serial voltages. An image display panel by switching a low voltage image data transmitter, a low voltage image data receiver for receiving the low voltage image data and restoring the image signal, and a video signal restored by the low voltage image data receiver It is preferable to include a video data supply unit for supplying to.

Here, the low voltage image data transmitter includes a low voltage differential signal (LVDS) of a serial type including a parallel image signal input from the outside and a first signal and a second signal inverted from the first signal. And converting into at least two or more types of serial data among a type, a mini low voltage differential signal (Mini LVDS) type, and a reduced swing differential signal (RSDS) type.

In addition, the difference between the voltage of the first signal and the second signal of the low voltage differential signal, the mini low voltage differential signal, the reduced width differential signal is different.

The low voltage image data transmitting unit may convert data of an external type parallel signal into serial data of at least two or more types of a low voltage differential signal type, a mini low voltage differential signal type, and a reduced width differential signal type. The first signal and the second signal using a conversion unit, a frequency matching unit for matching a frequency between the parallel-type image signal input from the outside and the converted serial data, and the serial data converted by the data conversion unit A reference current for supplying an inverted signal generator for generating a signal and a reference voltage of the first signal and the second signal, and for determining a difference between the voltage of the first signal and the second signal It characterized in that it comprises a voltage / current supply for supplying.

The data converter may include a 2 to 1 converter for converting 2-bit parallel data into 1-bit serial data, a 6 to 1 converter for converting 6-bit parallel data into 1-bit serial data, and 8 bits. (Bit) at least two or more of 8 to 1 converter for converting parallel data into 1-bit serial data, 10 to 1 converter for converting 10-bit (bit) parallel data into 1-bit serial data do.

In addition, the data converter is characterized in that composed of one chip (Chip).

In addition, the inversion signal generator is characterized in that commonly applied to at least two or more types of serial data of the low voltage differential signal type, the mini low voltage differential signal type, the reduced width differential signal type.

The inversion signal generator may further generate a first clock signal for controlling transmission of the first signal and the second signal and a second clock signal inverted from the first clock signal.

Hereinafter, the image display device of the present invention will be described in detail with reference to the accompanying drawings.

1 is a view for explaining the configuration of the video display device of the present invention.

Referring to FIG. 1, the image display apparatus 100 of the present invention includes a low voltage image data transmitter 110, a low voltage image data receiver 120, an image data supply 130, and an image display panel 140.

Here, the image display panel 140 is formed with a predetermined electrode to be supplied with the image data, and displays an image on the screen according to the image data supplied to the electrode.

For example, in the case of a plasma display panel, which is one type of the image display panel 140, an address electrode to which image data is supplied is formed, and image data, that is, data, is formed using the address electrode. The pulse is supplied to display an image on the screen.

The low voltage image data transmitter 110 converts a parallel image signal input from the outside into low voltage image data of two or more different types of serial type.

The low voltage image data receiver 120 restores the image signal by receiving the low voltage image data transmitted by the low voltage image data transmitter 110.

The image data supply unit 130 supplies the image signal restored by the low voltage image data receiver 120 to the image display panel 140 through a switching operation.

An implementation example of such an image display apparatus 100 will be described with reference to FIG. 2.

2 is a diagram illustrating an example of implementing an image display device of the present invention.

In FIG. 2, a case where the above-described image display panel 130 is a plasma display panel displaying an image using plasma discharge will be described as an example.

Referring to FIG. 2, the control board 210 for controlling the overall driving of the plasma display panel 600a and the data board 230 for controlling the supply of image data to the frame 600b disposed on the rear surface of the plasma display panel 600a. ) Is placed.

Here, the low voltage image data transmitter 220 is included in the control board 210 and the low voltage image data receiver 240 is included in the data board 230. The reason why the low voltage image data transmitter 220 is included in the control board 210 and the low voltage image data receiver 240 is included in the data board 230 is because the size of the plasma display panel 600a is relatively high. As a result, the distance between the control board 210 that controls the overall driving of the plasma display panel 600a and the data board 230 that controls the supply of the image data is relatively far from the control board 210. This is because the likelihood of distortion of the image signal is further increased when the image signal is transmitted up to the data board 230.

That is, when the image signal is transmitted from the control board 210 to the data board 230, the image signal is converted into a low voltage image signal and transmitted, thereby preventing distortion of the image signal.

As described above, the image signal transmitted from the control board 210 to the data board 230 is supplied to the plasma display panel 600a by the image data supply unit as described above. In the case of including the panel 600a, the panel 600a may be supplied by a data drive integrated circuit 260.

Here, the data drive integrated circuit unit 260 is disposed on the flexible flexible substrate 250, and the flexible substrate 250 on which the data drive integrated circuit unit 260 is disposed is the data board 230 and the plasma. It is preferably connected to the display panel 600a. More preferably, the flexible substrate 250 on which the data drive integrated circuit unit 260 is disposed includes the low-voltage image data receiver 240 disposed on the data board 230 and the address electrode X of the plasma display panel 600a. Is placed between.

Here, the low voltage image data transmitted and received between the low voltage image data transmitter 220 and the low voltage image data receiver 240 will be described with reference to FIGS. 3 to 4.

3 is a diagram for describing low voltage image data used in the image display device of the present invention.

4 is a diagram for explaining a voltage drop during transmission and reception of low voltage image data.

First, referring to FIG. 3, the low voltage image data used in the present invention may include a first signal having a predetermined swing width and a second signal inverted from the first signal based on the reference voltage V _Ref . Serial data to include.

The low voltage image data transmitter including the first signal and the second signal is transmitted to the low voltage image data receiver of code 120 of FIG. 1.

The low voltage image data may be a Low Voltage Differential Signals (LVDS) type, a Mini Low Voltage Differential Signal (Mini LVDS) type, or a Reduced Swing Differential Signals (RSDS) type. .

Here, the voltage difference ΔV between the first signal and the second signal may vary according to the type of the low voltage image data. For example, the difference ΔV between the first signal and the second signal of the low voltage differential signal type, the mini low voltage differential signal type, and the reduced width differential signal type is different from each other.

For example, in the low voltage differential signal type, the voltage difference ΔV of the first signal and the second signal is approximately 350 mV, and in the mini low voltage differential signal type, the voltage difference ΔV of the first signal and the second signal is approximately 200 mV.

When the low voltage image data transmitting unit 110 of FIG. 1 transmits the low voltage differential signal including the first signal and the second signal, the low voltage image data receiving unit 120 receives the received low voltage image data. The original video signal is restored using the difference between the voltages of the first signal and the second signal.

Next, referring to FIG. 4, it can be seen that a voltage drop occurs when the low voltage image data is transmitted from the low voltage image data transmitter to the low voltage image data receiver.

(a) shows a case where no low voltage image data is used, and (b) shows an example of using low voltage image data as in the present invention.

First, referring to (b), when a voltage drop occurs in the low voltage image data transmitted from the low voltage image data receiver according to the present invention, the reference voltage V _Ref of the low voltage image data is The voltage difference ΔV between the first signal and the second signal remains approximately constant.

As a result, even if a voltage drop or noise occurs in the low-voltage image data, the difference ΔV between the first voltage and the second voltage is kept substantially constant, and thus the image signal can be transmitted without distortion.

On the other hand, referring to (a), when the low voltage image data is not used, that is, when 5 V image data is transmitted from the low voltage image data transmitter to the low voltage image data receiver, the low voltage image data transmitter The image data transmitted from the image data received from the low voltage image data receiver may be different.

In this case, the image signal is distorted, and thus the desired image is not displayed smoothly.

A low voltage image data transmitter for converting and transmitting an image signal input from the outside into low voltage image data in the image display apparatus described above will now be described in detail.

FIG. 5 is a diagram for explaining a low voltage image data transmitting unit of the image display device of the present invention in more detail.

Referring to FIG. 5, the low voltage image data transmitter 110 includes a data converter 500, a voltage / current supply unit 510, a frequency matcher 520, and an inverted signal generator 530.

The data converter 500 converts an image signal of a parallel type input from the outside into at least two types of serial data of a low voltage differential signal type, a mini low voltage differential signal type, and a reduced width differential signal type.

More preferably, the data converter 500 converts an image signal of a parallel type input according to an externally supplied type selection signal into a low voltage differential signal type or a mini low voltage differential signal type.

The frequency matching unit 520 matches the frequency between the parallel image signal input from the outside and the converted serial data. The frequency matching unit 520 converts the frequency of the serial data converted by using a phase locked loop (PLL) or delay locked loop (PLL) to the frequency of an image signal input from the outside. Match.

The voltage / current supply unit 510 supplies a reference voltage (V _Ref ) of the first signal and the second signal, and reference current (Reference Current) for determining the difference between the voltage of the first signal and the second signal. : I _Ref ).

For example, when the type of the image data used is a low voltage differential signal type, that is, when the data converter 500 converts an image signal of a parallel type input from the outside into a low voltage differential signal type and uses the current. The voltage supply unit 510 supplies a reference voltage V _Ref and a reference current I _Ref according to the low voltage image data type.

For example, in the low voltage differential signal type, when the first signal and the second signal are 1.2V as the reference voltage (V _Ref ) and the voltage difference is 350mV, the current / voltage supply unit 510 may have a 1.2V reference voltage. (V _Ref ) and the reference current (I _Ref ) corresponding to 350mV is generated.

On the other hand, the type of video data used is a reduced width differential signal, and the first and second signals of the reduced width differential signal have a current of 1.2V as the reference voltage V _Ref and the voltage difference is 600 mV. The voltage supply unit 510 generates a reference voltage V _Ref of 1.2 V and a reference current I _Ref corresponding to 600 mV.

As such, the current / voltage supply unit 510 generates different reference voltages V _Ref and reference currents I _Ref depending on the type of image data used.

The inversion signal generator 530 generates the first signal and the second signal by using the serial data converted by the data converter 500.

Here, the configuration of the inverted signal generator 530 will be described in detail with reference to FIG. 6.

6 is a view for explaining an example of a more detailed configuration of the inverted signal generator in the video display device of the present invention.

Referring to FIG. 6, the inversion signal generator 530 includes a plurality of buffers 600, 610, 620, and 630 for generating a first signal and an inverted second signal. In addition, the inversion signal generator 530 is a buffer 640 for generating a first clock signal for controlling the transmission of the first signal and the second signal and a second clock signal inverted from the first clock signal. It is preferable to further include.

For example, when the inverted signal generator 530 is supplied with the serial data from the data converter 500 through line ①, the reference voltage V _Ref is supplied from the voltage / current supply unit 510 in the buffer 600. ) And the reference current I _Ref to generate the first signal, that is, the (A +) signal and the inverted second signal, that is, the (A-) signal. Here, the voltage difference between the (A +) signal and the (A-) signal is determined by the reference current I _Ref , and the (A +) signal and the (A-) signal are _swinged based on the reference voltage V _Ref . )do.

In addition, when serial data is supplied from the data converter 500 through line ②, the buffer 610 generates a first signal, that is, a (B +) signal and an inverted second signal, that is, a (B-) signal. Let's do it.

Through this method, the inversion signal generator 530 generates the (C +) signal, the (C-) signal, the (D +) signal, and the (D-) signal. In addition, when the clock signal CLK for controlling the transmission of the first signal and the second signal is supplied, the first clock signal, that is, the (CLK +) signal and the inverted second clock signal, using the buffer 640, That is, generate a (CLK-) signal.

In this way, the inversion signal generator 530 may generate the first signal and the second signal.

Meanwhile, the above-described data converter 500 converts an image signal of a parallel type input from the outside into at least two types of serial data among a low voltage differential signal type, a mini low voltage differential signal type, and a reduced width differential signal type. This data converter 500 will be described in more detail with reference to FIGS. 7A to 7D.

7A to 7D are diagrams for describing the data converter in more detail.

First, referring to FIG. 7A, the data converter 500 includes the LVDS data converter 700 and the Mini LVDS data converter 710. This is a configuration of the data converter 500 of the present invention for converting an image signal of a parallel type input from the outside into a low voltage differential signal type or a mini low voltage differential signal type.

Here, the LVDS data converter 700 converts an image signal input from the outside into serial data of a low voltage differential signal type. The LVDS data converter 700 preferably converts an input 7-bit parallel image signal into 1-bit bit serial image data. That is, the LVDS data converter 700 is a 7 to 1 converter that converts 7-bit parallel data into 1-bit serial data.

The Mini LVDS data converter 710 converts an image signal input from the outside into serial data of a mini low voltage differential signal type. The Mini LVDS data converter 710 preferably converts an input 6-bit (bit), 8-bit (bit), or 10-bit (bit) parallel image signal into 1-bit (bit) serial image data. That is, the Mini LVDS data converter 710 may include a 6 to 1 converter, an 8 to 1 converter, and a 6 to 1 converter to convert 6 bit or 8 bit or 10 bit parallel data into 1 bit serial data. It is one of the 10 to 1 converters.

The data converter 500 of FIG. 7A selects one of the LVDS data converter 700 and the Mini LVDS data converter 710 to convert the input image signal into serial data.

Next, referring to FIG. 7B, the data converter 500 of the present invention includes an LVDS data converter 700 and an RSDS data converter 720. This is a configuration of the data converter 500 of the present invention for converting an image signal of a parallel type input from the outside into a low voltage differential signal type or a reduced width voltage differential signal type.

Here, the RSDS converter 720 converts an image signal input from the outside into serial data of a reduced width voltage differential signal type. The RSDS data converter 720 preferably converts an input 2-bit (bit) parallel image signal into 1-bit (bit) serial image data. That is, the RSDS data converter 720 is a 2 to 1 converter that converts 2-bit parallel data into 1-bit serial data.

The data converter 500 of FIG. 7B selects one of the LVDS data converter 700 and the RSDS data converter 720 to convert the input image signal into serial data.

Next, referring to FIG. 7C, the data converter 500 of the present invention includes a Mini LVDS data converter 710 and an RSDS data converter 720. This is a configuration of the data converter 500 of the present invention for converting an image signal of a parallel type input from the outside into a mini low voltage differential signal type or a reduced width voltage differential signal type.

The data converter 500 of FIG. 7C selects any one of the Mini LVDS data converter 710 and the RSDS data converter 720 to convert the input image signal into serial data.

Next, referring to FIG. 7D, the data converter 500 includes the LVDS data converter 700, the Mini LVDS data converter 710, and the RSDS data converter 720. This is a configuration of the data converter 500 of the present invention for converting an image signal of a parallel type input from the outside into a low voltage differential signal type, a mini low voltage differential signal type or a reduced width voltage differential signal type.

The data converter 500 of FIG. 7D selects one of the LVDS data converter 700, the Mini LVDS data converter 710, and the RSDS data converter 720 to convert an input image signal into serial data. do.

As such, when the data converter 500 includes at least two of the LVDS data converter 700, the Mini LVDS data converter 710, and the RSDS data converter 720, the image of the present invention. The display device becomes easy to be compatible with other devices. For example, when the video display device of the present invention uses the low voltage differential signal type, compatibility with other devices using the mini low voltage differential signal type becomes possible.

Accordingly, the video display device of the present invention has an advantage of easy application of various applications.

It is preferable that the data converter 500 of FIGS. 7A to 7D described above are configured with one chip. For example, in FIG. 7D, the LVDS data converter 700, the Mini LVDS data converter 710, and the RSDS data converter 720 included in the data converter 500 may be implemented on different chips. Rather, it is implemented on one and the same chip.

As such, when the data converter 500 according to the present invention includes at least two of the LVDS data converter 700, the Mini LVDS data converter 710, and the RSDS data converter 720 together, The number of buffers provided in the inversion signal generator 520 may increase rapidly.

For example, the data conversion unit 500 of the present invention includes an LVDS data converter 700 and a Mini LVDS data converter 710, where the LVDS data converter 700 is a 7 to 1 converter, It is assumed that the Mini LVDS data converter 710 is a 6 to 1 converter and that the parallel video signal input from the outside is 24 bits.

In this case, except for the first clock and the second clock generation buffer, at least four buffers provided for the LVDS data converter 700 in the inversion signal generator 520 should be at least four, and the Mini LVDS data converter ( There should be at least four buffers provided for 710). Accordingly, at least eight buffers should be provided in the inversion signal generator 520 except for the first clock and the second clock generation buffer.

In order to prevent such an increase in the number of buffers, the image display device of the present invention causes the inversion signal generator 530 to perform at least two or more types of low voltage differential signal type, mini low voltage differential signal type, and reduced width differential signal type. It is desirable to have common application to serial data.

This will be described in more detail with reference to FIGS. 8 to 9 as follows.

8 is a view for explaining an example of the configuration of the video display device of the present invention for reducing the number of buffers used.

9 is a view for explaining another example of the configuration of the video display device of the present invention for reducing the number of buffers used.

First, referring to FIG. 8, when the data converter 500 includes the LVDS data converter 700 and the Mini LVDS data converter 710, the inverted signal generator 530 may include the aforementioned LVDS data converter ( The buffers 800, 810, and 820 commonly used in the 700 and the Mini LVDS data converter 710 are provided.

For example, the LVDS data converter 700 is a 7 to 1 converter, the Mini LVDS data converter 710 is a 10 to 1 converter, and thus the LVDS data converter 700 is configured with a total of four buffers. Assume that the Mini LVDS data converter 710 uses a total of three buffers.

In this case, three buffers among the buffers of the inversion signal generator 530 are used together by the LVDS data converter 700 and the Mini LVDS data converter 710, and one buffer is used only by the LVDS data converter 700. Can be used alone.

When the buffers used for the LVDS data converter 700 and the Mini LVDS data converter 710 are separately provided, the buffers 840 for generating the first clock CLK + and the second clock CLK- may be provided. At least seven buffers should be used except for this, but if configured as shown in FIG. 8, four buffers except the buffer 840 for generating the first clock CLK + and the second clock CLK- may be used. It is also possible to perform the desired driving. Accordingly, the number of buffers used can be reduced.

Next, referring to FIG. 9, when the data converter 500 includes the LVDS data converter 700, the Mini LVDS data converter 710, and the RSDS data converter 720, the inverted signal generator 530 may be used. A buffer 900, 910, 920, 930 commonly used in at least two or more of the above-described LVDS data converter 700, Mini LVDS data converter 710, and RSDS data converter 720 is provided. .

For example, the LVDS data converter 700 is a 7 to 1 converter, the Mini LVDS data converter 710 is a 10 to 1 converter, the RSDS data converter 720 is a 2 to 1 converter, Accordingly, the LVDS data converter 700 uses a total of four buffers, the Mini LVDS data converter 710 uses a total of three buffers, and the RSDS data converter 720 uses a total of 12 buffers. Suppose

In this case, three of the buffers of the inversion signal generator 530 are used by the LVDS data converter 700, the Mini LVDS data converter 710, and the RSDS data converter 720 together. The LVDS data converter 700 and the RSDS data converter 720 may be used together, and only eight RSDS data converters 720 may be used alone.

When the buffers used for the LVDS data converter 700, the Mini LVDS data converter 710, and the RSDS data converter 720 are separately provided, the first clock CLK + and the second clock CLK− may be provided. At least 19 buffers should be used except for the buffer 840 to generate them, but if configured as shown in FIG. 9, the buffer 912 for generating the first clock CLK + and the second clock CLK- may be used. Except for this, a total of 12 buffers can be used to perform a desired operation. Accordingly, the number of buffers used can be reduced.

As such, the technical configuration of the present invention described above can be understood by those skilled in the art that the present invention can be implemented in other specific forms without changing the technical spirit or essential features of the present invention.

Therefore, the exemplary embodiments described above are to be understood as illustrative and not restrictive in all respects, and the scope of the present invention is indicated by the appended claims rather than the foregoing detailed description, and the meaning and scope of the claims are as follows. And all changes or modifications derived from the equivalent concept should be interpreted as being included in the scope of the present invention.

As described in detail above, the video display device of the present invention increases the compatibility with other devices by easily using two or more different types when converting a video signal, and has an effect of easily applying various applications. .

Claims (8)

A low voltage image data transmitter for converting a parallel image signal input from the outside into two or more different types of low voltage image data of serial type; A low voltage image data receiver configured to receive the low voltage image data and to restore the image signal; And An image data supply unit configured to supply an image signal restored by the low voltage image data receiver to an image display panel through a switching operation; Including; The low voltage image data transmitter A data converter for converting an image signal of a parallel type input from the outside into at least two types of serial data; A frequency matching unit which matches a frequency between the parallel image signal input from the outside and the converted serial data; An inverted signal generator for generating the first signal and the second signal using the serial data converted by the data converter; And A voltage / current supply unit supplying a reference voltage of the first signal and the second signal and supplying a reference current for determining a difference between the voltage of the first signal and the second signal; The video display device comprising a. The method of claim 1, The data conversion unit A low voltage differential signal (LVDS) type, a mini low voltage differential signal (LVDS) type of a serial type including an image signal of a parallel type input from the outside and a second signal inverted from the first signal. A video display device characterized by converting at least two or more types of serial data among Mini LVDS) type and Reduced Swing Differential Signals (RSDS) type. The method of claim 2, And a difference between voltages of the first signal and the second signal of the low voltage differential signal, the mini low voltage differential signal, and the reduced width differential signal is different from each other. delete The method of claim 1, The data conversion unit 2 to 1 converter for converting 2-bit parallel data into 1-bit serial data, 6 to 1 converter for converting 6-bit parallel data to 1-bit serial data, 8-bit parallel data And at least two of an 8 to 1 converter for converting 1-bit serial data and a 10 to 1 converter for converting 10-bit parallel data into 1-bit serial data. The method of claim 1, And the data converter comprises one chip. The method of claim 1, The inversion signal generator is And a low voltage differential signal type, a mini low voltage differential signal type, and a reduced width differential signal type, which are commonly applied to serial data of at least two types. The method of claim 1, The inversion signal generator is And a second clock signal for controlling transmission of the first signal and the second signal and a second clock signal inverted from the first clock signal.

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