KR101194365B1 - Pannel connecting cable for display port - Google Patents

Abstract

PURPOSE: A display port type panel connecting cable is provided to drastically increase the connection distance between an image board and a display panel. CONSTITUTION: A pair of connector pins for a set differential signal pair are adjacent to a connector(101) for an image board with at least eighteen connector pins. A connector for a panel arranges connector pins in a pin arrangement order of the panel or the order opposite to a connector pin arrangement order of the connector for the image board. The connector pins for high speed signal grounding are arranged in every side of the connector pins. A connection line portion(120) includes at least six twist lines(121-126).

Description

Panel connecting cable for display port

The present invention relates to a display port type panel connection cable that is used in an internal interface of a display port type, which is a next generation display interface standard, and connects between an image board and a display panel while reducing noise.

Display Port is a conventional display interface method such as analog RGB, Digital Video / Visual Interface (DVI), High-Definition Multimedia Interface (HDMI), and internal interface such as Low Voltage Differential Signaling (LVDS). A new digital display interface standard established by the Video Electronics Standard Association (VESA) to reduce design complexity and efficiency by using the parallel method, simplifying the digital interface of graphic chips and external display devices, and providing future additional service functions. It is a composite application that provides superior performance compared to DVI.

This display port method supports high bandwidth of 10.8Gbit / s compared to DVI of 4.96Gbit / s, high resolution of 2560 × 1600 (WQXGA) with a single cable, and transmits the maximum bandwidth up to 3m. Support. In addition, the audio channel supports up to eight channels and provides content copyright protection. With the release of version 1.2, the maximum supported resolution has increased to 3840 × 2400 @ 60fps.

The display port method integrates the external interface and the internal interface as one method, and it can be seen that the configuration of the display port method of FIG. 2 is much simpler than the conventional method shown in FIG. 1.

That is, in the conventional digital method as shown in FIG. 1, when an image is received through an external interface such as DVI through the input interface 1, the image processor 2 processes the image and then provides the image to the LCD panel 20. The LVDS converter 3 converts the digital signal into a differential analog signal. This is transmitted to the LCD panel 20 through the LVDS interface (4, 21) consisting of 91 pins.

Therefore, the video board unit 10 should be configured with a DVI interface 1 and a converter 3 for converting a DVI signal into LVDS, and an interface 4 that occupies a wide space of 91 pins. This configuration requires a large physical chip and interface space, increases power consumption for signal conversion, and requires artwork space for interface connection. Boards are often used, making design difficult and costly.

FIG. 2 illustrates a display port type image board and an LCD panel configuration. As illustrated, the image board unit 30 includes a display external interface 31 and an image processor 32 and 30 pins for processing an image. The display port of the internal interface 33 is simplified. In particular, the configuration of the image board is greatly simplified because a separate signal conversion is not required to process the display port type signal received through the external interface and transmit it to the display port internal interface 41 of the LCD panel 40 again. As a result, the footprint of the artwork area, chips and interfaces is small, which significantly reduces board costs.

Therefore, the display port method is increasing in order to support the resolution of WQXGA level or more, which is increasing in demand recently.

On the other hand, in the case of the display port method, the external interface for signal transmission between devices uses a connector much smaller than the conventional DVI, and the pin layout and the transmission distance are clearly defined, but the video board unit 30 In the case of the 30-pin internal interface connecting between the LCD panels 40, only necessary signal lines are defined, so the pin layouts differ from company to company, and the specifications for the length of the internal interface do not consider actual application environments. to be. In the case of the cable for the internal interface currently used commercially, it is difficult to use the length of 200mm or more due to noise.

In particular, since various display application devices are required to cope with various configurations such as multicube, kiosk, advertising terminal, etc. in addition to a single monitor, signal stability is required when an internal interface of a predetermined length (typically 200mm) is required. The noise filter is configured for the present invention, and various shielding means for noise blocking are added to extend the length. However, the addition of this additional noise management configuration increases the cost of the video board due to the large size of the board or the need for a multi-layer board. When applied to a system, the quality deteriorates.

(Document 0001) Korean Patent Registration No. 10-0587473

In the display port type panel connection cable according to an embodiment of the present invention, a high-speed ground signal line is disposed on one side of each signal pair for six signal pairs composed of differential signals among the 30-pin internal interface cables of the display port type. Twist each signal pair and high-speed ground signal to form 6 twisted lines, and the purpose is to significantly reduce noise even when transmitting high-speed signals of WQXGA level or higher.

The display port type panel connection cable according to the embodiment of the present invention twists six signal pairs consisting of differential signals among the 30-pin internal interface cables of the display port type, and arranges a high-speed ground signal line between each twisted signal pair to prevent noise. By blocking the abandonment of the electric field lines causing the WQXGA-class high-speed signal is to reduce the noise accordingly.

The display port type panel connection cable according to the embodiment of the present invention further includes twisting six twisted lines including the high speed ground signal once again or twisted six twisted lines between the high speed ground signals and a high speed ground signal therebetween. It aims to improve the noise blocking performance by twisting as a whole.

Display port type panel connection cable according to an embodiment of the present invention for achieving the above object is a cable for the internal interface for connecting between the image board and the display panel according to the display port specifications, as long as for the preset differential signal pair A video board side connector including at least 18 connector pins disposed adjacent to each other in the pair of connector pins and arranged at one side of the pair of connector pins for each differential signal pair for high-speed signal grounding; A panel-side connector which reverses the order of pin assignment of the connector with the image board-side connector or follows the pin assignment of the panel; A high-speed signal interconnecting the corresponding connector pins of the image board side connector and the panel side connector and disposed adjacent to each differential signal pair based on a line for each differential signal pair and a connector pin arrangement of the image board side connector And a connecting line section having at least six twisted lines twisted together for the ground.

The image board-side connector and the panel-side connector each have 30 pins, and the connection line part has six twisted lines connected to 18 connector pins for high speed signal ground corresponding to the differential signal pair and each differential signal pair. And twist-free lines connecting the remaining 12 connector pins.

The six twisted lines may be twisted as a whole in each unit.

The cable is a 30-line cable, and the 12 lines are connected between the image board side connector and the panel side connector without being twisted.

The connection line part may be coated with one, and the coating may further include a grounding structure for shielding noise.

The display port type panel connection cable according to another embodiment of the present invention is an internal interface cable connecting the image board and the display panel according to the display port specification, and a pair of connector pins for a preset differential signal pair are disposed adjacent to each other. A video board side connector including at least 18 connector pins arranged at one side of the pair of connector pins for each differential signal pair for fast signal grounding; A panel-side connector which reverses the order of pin assignment of the connector with the image board-side connector or follows the pin assignment of the panel; At least six high-speed signal grounds connected to the corresponding connector pins of the image board-side connector and the panel-side connector and disposed adjacent to each of the differential signal pairs based on the connector pin arrangement of the image board-side connector; And a connecting line portion having at least six twisted lines twisting a pair of lines for each differential signal pair in a shielded space partitioned by them.

The display port type panel connection cable according to the embodiment of the present invention as described above is twisted after arranging a signal pair composed of differential signals and a high speed ground signal line among the 30-pin internal interface cables of the display port type, and twisting them. There is an effect that can significantly increase the connecting distance between the panels.

In addition, the display port-type panel connection cable according to an embodiment of the present invention, by twisting a portion of the signal line to reduce the influence of noise to increase the reliability of the product and to maintain the quality by reducing the deviation between panels In addition, the display port type high resolution panel can be utilized for various purposes without a noise problem.

In addition, due to the increase in immunity due to the noise, it is not necessary to add a separate noise shielding configuration on the image board, thereby reducing the cost and reducing the size of the image board and the use layer.

1 is an example showing the interface configuration of a typical display device.
Figure 2 shows an example of the display port type interface configuration.
Figure 3 is an example showing the structure of a typical cable used for the internal interface of the display port method.
Figure 4 is an exemplary view showing the generation of noise when using a conventional general cable structure.
5 is a table showing a pin arrangement and a line connection method for explaining the cable configuration and twisting method according to an embodiment of the present invention.
6 is a conceptual diagram showing a cable structure according to an embodiment of the present invention.
7 is a photograph showing the actual state of the cable described with reference to FIG.
8 is a conceptual diagram showing a cable structure according to another embodiment of the present invention.
Figure 9 is a photograph showing a cable structure according to another embodiment of the present invention.
10 is an actual video state when using a cable according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

3 shows the structure of the cable used for the internal interface of the display port method. As shown in FIG. 2, the 30-pin cable 50 for the internal interface of FIG. 2 uses a flat cable 51 as shown in FIG. In this case, the flat cable 51 simply covers the cable 52 in a circular shape.

On the other hand, the internal interface of the display port mainly follows the interface pin arrangements internally arranged differently for LCD panel companies. Since no standard is provided for the corresponding interface pin arrangements, the noise generation states of the display ports are different.

In the case of FIG. 3A, since the connector of the video board for the cable 51 is configured to correspond to the manufacturer's standard of the LCD panel, the cable thickness is a problem when the image board is connected to the LCD panel. The noise immunity is not good. In the case of FIG. 3B, since the cable connecting line portion is circularly coated, the connector on the LCD panel side of the cable 52 follows the standard of the LCD panel manufacturer, but the image board side connector may be configured according to the image board side standard. In addition, since the inflow of noise can be additionally blocked by applying a conductive thin film or a metal mesh to cover the lines and shielding by the ground, in most cases, a circular cable form as shown in FIG. 3B is used.

However, even if this method is used, the cable length of the internal interface is practically not exceeding 200mm since it can transmit a wide bandwidth signal of 10Gbit / s and there may be various noise environments.

The length of 200mm may not be a big problem if a simple unit monitor is configured, but the distance between the video board and the LCD panel is 200mm for LCD panels applied to multicube, UHD, various advertising monitors, kiosks, ATMs, etc. It is often exceeded. In addition, even in the case of a simple unit monitor, the generalization of various high-power wireless transmission devices, the increased heat generation of a large display, and the various noises and thermal noises generated in the case of integrated terminals may reduce reliability due to noise even with a cable within 200 mm.

FIG. 4 is configured in the form of the cable of FIG. 3B but has a length of 400 mm required in a specific field, and the quality is degraded due to noise inflow as shown in the case of sending a 2560 × 1440 resolution image at 60 fps. You can see that.

5 is a table showing a cable configuration method according to an embodiment of the present invention, as shown in the pin arrangement of the cable connector as shown specifically in the form for the noise blocking, and the actual noise inflow Separate additional configurations by placing high-speed ground signal lines between the differential signal pairs that are causing the problem, then twist these differential signal pairs in the configuration 1 or configuration 2 and, if necessary, further twist in the configuration 3 configuration. Without this, the noise blocking performance can be greatly increased.

When the cable is configured in the same manner as in the configuration 2 of FIG. 5, the noise blocking performance is improved to such an extent that image degradation does not occur at all in the same condition as that of FIG. 4.

Referring to the configuration of FIG. 5, first of all, 30 pins assigned to one connector of a cable are divided into 12 pins such as signals for power and hot plug-in, and six pairs of differential signals that may cause signal degradation due to actual noise. Then, a high speed signal ground (one reference 13, 16, 19, 22, 25, 28) is disposed on one side of the six pairs of differential signals.

In addition, the configuration of the configuration 1, configuration 2, configuration 3 is applied to the twist configuration for noise reduction.

In configuration 1, the differential signal pairs are twisted separately, and a high speed ground signal line is disposed between each of the twisted differential signal pairs so that the differential signal pair is substantially positioned between the high speed ground signal lines so as to cut off the power lines induced from adjacent signal lines. .

In configuration 2, six twisted lines are formed by twisting the differential signal pairs and three adjacent high-speed ground signal lines at the same time, thereby preventing the inflow of noise between adjacent signal pairs and the inflow of external noise.

Practically, configuration 1 can be used if a flat cable is required, while configuration 2 has higher noise isolation.

For configuration 3, twist additional twisted differential signal pairs and adjacent high-speed ground signal lines in configuration 1 and twist the six twisted individual lines again, or add six twisted differential signal pairs and six adjacent high-speed ground signals at once. By twisting, the noise blocking performance can be further improved.

In addition, if configuration 2 is used, configuration 3 may further twist the six twisted lines to further improve the noise blocking performance.

In all of the configuration 1, configuration 2, configuration 3, the 12 lines of the pin numbers 1 to 12 of one side do not need to twist because the effect of the twist is insignificant.

FIG. 6 shows an example of configuration 2. As shown in FIG. 6, one connector 101 and the other connector 102 of the cable 100 may be configured such that pins are arranged in opposite directions so that the line is not twisted. If the connector 102 is connected to the LCD panel, and the connector of the LCD panel has a predetermined pinout, the corresponding connector 102 may follow the pinout of the LCD panel. In this case, the other connection configuration is shown. May be somewhat different, but it will be predictable by anyone skilled in the art)

In the illustrated configuration, the pin arrangement of the one side connector 101 follows the one side pin number arrangement of FIG. 5, and the pin is the first pin. As shown, the bit twisting line region 110 of pin numbers 1 to 12 is connected to the corresponding other connector 102 without a separate twist, and the pin numbers 13 to 15 (121) and the pin numbers 16 to 18 (122). The unit twist configuration, which is divided into three pins, is divided into groups of six pairs of 18 pins up to pin numbers 28 to 30 (126). That is, the twisted line region 120 is a twisted unit of a differential signal pair (S-, S +: the order may be reversed) and an adjacent high-speed ground signal (HG: may be configured on another adjacent side of the differential signal pair). It consists of six twist lines 121-126.

The unit twist lines are more than double the cable length for the internal interface, which is limited to about 200mm effectively because the noise reduction caused by the twist of the differential signal pair and the interruption of the electric field line induced by the twist of the high speed ground cause synergy. Can be extended.

Figure 7 is a picture of the actual cable configured in accordance with the structure of Figure 6, substantially no additional costs incurred except for the line length that is inadequately increased by the labor and twist for twist, and very economically block noise If necessary, the length of the track can be reliably extended.

FIG. 8 is a configuration example of the cable according to Configuration 1 of FIG. 5, and the unit twist line 121 'is composed of a twisted differential signal pair and a high-speed ground signal line that distinguishes between the differential signal pairs as shown in FIG. In this case, the increase in the thickness of the cable is not so large that it can be configured as a flat cable, and yet it provides a significantly improved noise blocking performance compared to the conventional method.

FIG. 9 is a diagram illustrating an example of a cable configuration according to the configuration 3 of FIG. 5. In the case illustrated in FIG. 5, the twisted track area in which the unit twist is further twisted according to configuration 1, and in this case, the twisted line area The non-twisted track area is maintained. If necessary, the connector itself in the twisted line region and the bit twisted line region can be configured separately so that a pair of cables can be provided, or a single cable integrated by sheathing, but a connector can be made in pairs on each side.

In the case of Figure 9 is not separately coated to show the interior, configuration 3 for configuration 1 or configuration 3 for configuration 2 or both can be integrated into a single cable covering the cable line as shown in Figure 3b.

The coating of the line may use a simple insulating tube, but preferably, a conductive thin film, a metal mesh, or the like may be further configured as a grounding structure for noise shielding.

Thus, when using the configuration as shown in Figure 9 can provide an excellent performance that can be extended to a substantially 700mm length without noise.

FIG. 10 may identify a clear screen without noise as an image when the configuration 2 of the present invention is used under the same condition as that of FIG. 4.

In the above described and illustrated with respect to preferred embodiments according to the present invention. However, the present invention is not limited to the above-described embodiment, and various modifications can be made by those skilled in the art without departing from the gist of the present invention attached to the claims. .

100: cable 101: one end connector
102: other connector 110: bit twisted line area
120: twisted track area 121 to 126: unit twisted track

Claims (10)

Cable for the internal interface that connects the video board and display panel according to the display port specification.
An image including at least 18 connector pins disposed adjacent to a pair of connector pins for a preset differential signal pair and connector pins for high-speed signal ground on one side of the pair of connector pins for each differential signal pair. A board side connector;
A panel-side connector which reverses the order of pin assignment of the connector with the image board-side connector or follows the pin assignment of the panel;
A high-speed signal interconnecting the corresponding connector pins of the image board side connector and the panel side connector and disposed adjacent to each differential signal pair based on a line for each differential signal pair and a connector pin arrangement of the image board side connector And a connecting line portion having at least six twisted lines twisted together for grounding.
The connector of claim 1, wherein the image board side connector and the panel side connector each have 30 pins, and the connection line part is connected to 18 connector pins for high speed signal ground corresponding to the differential signal pair and each differential signal pair. Display port type panel connection cable comprising six twisted lines and twistless lines connecting the remaining 12 connector pins.
The display port panel connecting cable of claim 1, wherein the twisted six twisted lines are twisted as a whole in each unit.
The method of claim 3, wherein the cable is a 30-line cable, 12 lines are connected to the display port-type panel connection cable, characterized in that is connected between the connector and the panel side connector without twisting.
The display port type panel connection cable according to claim 4, wherein the connection line portion is covered with one.
The display port type panel connection cable according to claim 5, wherein the sheath is further provided with a grounding structure for noise shielding.
The display port type panel connecting cable of claim 4, wherein the 12 untwisted lines are separated from the 18 twisted lines and are also separated from the connector on the image board side or the panel side.
Cable for the internal interface that connects the video board and display panel according to the display port specification.
An image including at least 18 connector pins disposed adjacent to a pair of connector pins for a preset differential signal pair and connector pins for high-speed signal ground on one side of the pair of connector pins for each differential signal pair. A board side connector;
A panel-side connector which reverses the order of pin assignment of the connector with the image board-side connector or follows the pin assignment of the panel;
At least six high-speed signal grounds connected to the corresponding connector pins of the image board-side connector and the panel-side connector and adjacent to each of the differential signal pairs based on the connector pin arrangement of the image board-side connector; And a connecting line portion having at least six twisted lines twisting a pair of lines for each differential signal pair in a shielded space partitioned by the same.
The display port type panel connecting cable according to claim 8, wherein six individual lines and six twisted lines of the connecting line part are twisted again as a whole.
The display port type panel connection cable according to claim 8, wherein the cable is a 30-wire cable and twelve wires are connected between the image board side connector and the panel side connector without being twisted.

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