CN201146080Y - Simple DVI signal line - Google Patents

Abstract

The utility model relates to a signal line technical field refers in particular to a brief type DVI signal line, a data transmission line for transmitting differential signal only has the signal line, a group of data transmission line for clock control includes signal line and a bare earth line, the periphery of each group of data transmission line vertically surrounds one deck conducting surface respectively and faces outwards, the inside single face foil of insulating surface orientation, the conducting surface of each group of data transmission line peripheral single face foil contacts with the shielding layer respectively, bare earth line contacts with the conducting surface that sets up at the peripheral single face foil of a group of data transmission line that is used for clock control, thereby constitute the zero voltage of the differential impedance of measuring each group of data transmission line; the utility model discloses a DVI signal line has simplified the structure of DVI signal line, has cancelled many bare ground wires, changes the aluminium foil of spreading wings into the single face aluminium foil, and the structure becomes simple, reduces its manufacturing cost, and guarantees that differential impedance satisfies the requirement of standard, improves its market competition.

Description

A Simple DVI Signal Cable

Technical field:

The utility model relates to the technical field of signal lines, in particular to a simple DVI signal line.

Background technique:

The DVI signal cable is mostly used to connect the DVI interface on the display and the host, and the DVI signal cable includes multiple sets of data transmission lines, electronic lines, shielding layers and outer sheaths. Among the data transmission lines of the DVI signal line, there are three or six sets of data transmission lines for transmitting differential signals (TMDS signals), and one set of data transmission lines for clock (clock) control. Usually, the structure of a group of data transmission lines is composed of a pair of signal lines and a bare ground wire. A set of data transmission lines is longitudinally covered with a layer of aluminum foil with wings, wherein the conductive surface of the aluminum foil with wings faces inward, and the insulating surface of the aluminum foil with wings faces In addition, the bare ground wire is in contact with the conductive surface of the aluminum foil, and the two are electrically connected. The differential impedance of the data transmission line is the main parameter to evaluate the transmission performance of the DVI signal line. According to the calculation formula of the differential impedance, the value of the differential impedance is only related to the structure of the signal line in the data transmission line, and has nothing to do with the bare ground wire. The role of the ground wire is to form a zero voltage for impedance measurements. The current DVI signal line has a complex structure, and the unit price of materials such as bare ground wire (copper wire) and aluminum foil with wings is high, which makes the cost of the product high and reduces its market competitiveness.

Utility model content:

The purpose of the utility model is to provide a simple DVI signal line for the disadvantages of the prior art, which simplifies the structure of the DVI signal line and reduces its production cost.

In order to achieve the above object, the utility model is achieved through the following technical solutions: it includes data transmission lines, electronic lines, shielding layers and outer sheaths respectively used to transmit differential signals and clock control, and each group of data transmission lines is connected with the electronic lines respectively. Twisted into a cable core, the shielding layer is longitudinally wrapped around the periphery of the cable core, and the outer sheath is longitudinally wrapped around the periphery of the shielding layer. The data transmission lines used to transmit differential signals are only signal lines, and the set of data transmission lines used for clock control includes signal lines. wire and a bare ground wire; each group of data transmission lines is longitudinally surrounded by a layer of single-sided metal foil, the conductive surface of the single-sided metal foil faces outward, and the insulating surface of the single-sided metal foil faces inward. The conductive surfaces of the two-sided metal foil are in contact with the shielding layer and are electrically connected. The bare ground wire in the group of data transmission lines used for clock control is arranged on the periphery of the single-side metal foil of the group of data transmission lines. The bare ground wire and The conductive surfaces of the single-sided metal foils arranged on the periphery of the group of data transmission lines are in contact with each other.

The single-sided metal foil is single-sided aluminum foil.

The shielding layer includes a metal foil and a braided mesh wire, and the metal foil and the braided mesh wire are electrically connected.

The metal foil is double-sided aluminum foil.

Beneficial effects of the utility model: the data transmission lines used to transmit differential signals only have signal lines, and the group of data transmission lines used for clock control includes signal lines and a bare ground wire; the peripheries of each group of data transmission lines are longitudinally surrounded by a layer Single-sided metal foil, the conductive surface of the single-sided metal foil faces outward, the insulating surface of the single-sided metal foil faces inward, the conductive surface of the single-sided metal foil of each group of data transmission lines is in contact with the shielding layer and electrically connected, and the bare ground The line is in contact with the conductive surface of the single-sided metal foil arranged on the periphery of the group of data transmission lines used for clock control, thereby forming a zero voltage for measuring the differential impedance of each group of data transmission lines; the DVI signal line of the utility model simplifies the DVI signal The structure of the wire, canceling multiple bare ground wires, changing the winged aluminum foil to a single-sided aluminum foil, the structure becomes simple, reduces the weight of the DVI signal line, further reduces its production cost, and ensures that the differential impedance meets the requirements of the standard. improve its market competitiveness.

Description of drawings:

Accompanying drawing 1 is the structural representation of the utility model.

Detailed ways:

See accompanying drawing 1 for the embodiment, the simple DVI signal line includes four sets of data transmission lines 1, electronic lines 2, shielding layer 4 and outer sheath 5, wherein, there are three sets of data transmission lines 1 for transmitting differential signals, one set of data transmission lines 1 For time control, four sets of data transmission lines 1 and electronic lines 2 are twisted together to form a cable core, the shielding layer 4 is longitudinally wrapped around the periphery of the cable core, and the outer sheath 5 is longitudinally wrapped around the periphery of the shielding layer 4 .

The shielding layer 4 includes a metal foil 7 and a braided mesh wire, and the metal foil 7 and the braided mesh wire are electrically connected.

The metal foil 7 is a double-sided aluminum foil. Of course, the metal foil 7 can also be a single-sided aluminum foil, but the shielding effect on external interference becomes worse.

Among the four sets of data transmission lines 1 described above, the three sets of data transmission lines 1 used to transmit differential signals only have signal lines, the three sets of data transmission lines 1 all cancel bare ground wires, and the set of data transmission lines 1 used for clock control includes Signal wire and a bare ground wire 6. The periphery of each group of data transmission lines 1 is longitudinally surrounded by a layer of single-sided metal foil 3 , the conductive surface of the single-sided metal foil 3 faces outward, and the insulating surface of the single-sided metal foil 3 faces inward. The conductive surfaces of the single-sided metal foil 3 of each group of data transmission lines 1 are respectively in contact with the shielding layer 4 to be electrically connected, wherein the bare ground wire 6 in the group of data transmission lines 1 used for clock control is set on the data transmission line 1 of the group. On the periphery of the single-sided metal foil 3 of the transmission line 1, the bare ground wire 6 is in contact with the conductive surface of the single-sided metal foil 3 arranged on the periphery of the group of data transmission lines 1, and the two are electrically connected, thereby forming the four groups of data transmission lines. Zero voltage of differential impedance, which simplifies the structure of DVI signal line.

The single-sided metal foil 3 is a single-sided aluminum foil, and using the single-sided aluminum foil to replace the existing spread-wing aluminum foil can reduce the cost of the DVI signal line.

Because the differential impedance of the data transmission line 1 that is used to transmit the differential signal is only related to the structure of the signal line, as long as the structural design of the signal line is appropriate, it can be guaranteed that the differential impedance meets the requirements of the standard. A bare ground wire 6 makes the structure of the DVI signal line simpler, and the aluminum foil with wings is changed to single-sided aluminum foil, which reduces the cost of materials.

The above is only a preferred embodiment of the utility model, and the utility model is equally applicable to DVI signal lines with six groups of data transmission lines for transmitting differential signals, so all structures according to the scope of the utility model patent application, Equivalent changes or modifications made to features and principles are all included in the scope of the utility model patent application.

Claims (4)

1. A simple DVI signal line, which includes a data transmission line (1), an electronic line (2), a shielding layer (4) and an outer sheath (5) for transmitting differential signals and clock control respectively, each set of data The transmission line (1) is twisted with the electronic wire (2) to form a cable core, the shielding layer (4) is longitudinally wrapped around the periphery of the cable core, and the outer sheath (5) is longitudinally wrapped around the periphery of the shielding layer (4), which is characterized in that : The data transmission lines (1) used to transmit differential signals only have signal lines, and the group of data transmission lines (1) used for clock control includes signal lines and a bare ground wire (6); each group of data transmission lines (1) The periphery is surrounded by a layer of single-sided metal foil (3) longitudinally, the conductive surface of the single-sided metal foil (3) faces outward, the insulating surface of the single-sided metal foil (3) faces inward, and the single-side of each group of data transmission lines (1) The conductive surfaces of the metal foils (3) are respectively in contact with the shielding layer (4) for electrical conduction, and the bare ground wires (6) in the group of data transmission lines (1) used for clock control are arranged on the group of data transmission lines ( 1) on the periphery of the single-sided metal foil (3), the bare ground wire (6) is in contact with the conductive surface of the single-sided metal foil (3) arranged on the periphery of the group of data transmission lines (1). 2. A simple DVI signal cable according to claim 1, characterized in that: the single-sided metal foil (3) is single-sided aluminum foil. 3. A simple DVI signal cable according to claim 1, characterized in that: the shielding layer (4) includes a metal foil (7) and a braided network cable, and the metal foil (7) and the braided network cable are electrically connected. 4. A simple DVI signal cable according to claim 3, characterized in that: the metal foil (7) is double-sided aluminum foil.

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