CN215911170U

CN215911170U - TFT display driving device of anti-interference TYPE TYPE-C interface

Info

Publication number: CN215911170U
Application number: CN202121363982.2U
Authority: CN
Inventors: 邢树华
Original assignee: Yashi Optoelectronics Group Co ltd
Current assignee: Yashi Optoelectronics Group Co ltd
Priority date: 2021-06-18
Filing date: 2021-06-18
Publication date: 2022-02-25
Anticipated expiration: 2031-06-18

Abstract

The utility model provides a TFT display driving device of an anti-interference TYPE TYPE-C interface, which comprises a TYPE-C interface, a power supply module, a TYPE-C to LVDS signal conversion chip, an LVDS display signal output port and an audio signal output port. The driving device is a laminated structure of four layers of circuit boards; the low voltage differential signaling device comprises an electric element layer, a power supply wiring layer, a ground layer and an LVDS signal wiring layer from top to bottom; mounting an electric element on the electric element layer; the LVDS signal wiring layer is provided with low-voltage differential wiring, and grounding via holes are uniformly arranged around the low-voltage differential wiring and are electrically connected with the grounding layer. The interface of its signal receiving terminal adopts the TYPE-C interface that has power supply and signal integration and has the anti-plug function, and the signal of output for the display adopts LVDS signal transmission, reduces the radiation emission volume of circuit, adopts the stacked structure of four layers of circuit boards simultaneously, is equipped with the LVDS signal and walks the ground connection via hole around the line, can effectively solve EMI protection problem to avoid LVDS signal package loss, distortion problem.

Description

TFT display driving device of anti-interference TYPE TYPE-C interface

Technical Field

The utility model relates to the technical field of liquid crystal displays, in particular to a TFT display driving device of an anti-interference TYPE TYPE-C interface.

Background

The TYPE-C interface has a much smaller volume than the TYPE-A and TYPE-B, is the latest USB interface appearance standard (the TYPE-C contains USB but is two different interfaces with USB), integrates the power supply end and the audio and video signal segments into a whole, has no difference in positive and negative directions, can be randomly plugged and pulled, is an interface with power supply and signal integration and anti-reverse-plugging functions (the power supply interface is a bidirectional interface which can be charged and can supply power). A TFT display driving device which is compatible with a driving signal of a TYPE-C interface can be designed.

The existing display compatible with the TYPE-C interface has the following problems: the digital signals output by the liquid crystal display driving board include RGB data signals, and also include signals such as line synchronization, field synchronization, and pixel clock. By adopting the TTL interface, the data transmission rate is not high, the transmission distance is short, the anti-electromagnetic interference (EMI) capability is poor, and the transmitted data is distorted; in addition, TTL multichannel data signals are transmitted in a flat cable mode, the number of the whole flat cables reaches dozens of lines, and the TTL multichannel data signals are not convenient to connect and are not suitable for the trend of ultra-thinning. The existing TFT display module needs to be independently powered. The LVDS output interface is adopted to transmit data, so that the problems can be solved, and the high-speed, low-noise, long-distance and high-accuracy transmission of the data is realized.

An LVDS (Low Voltage Differential Signaling) interface is also called an RS-644 bus interface, and is a high-speed data transmission and interface technology. LVDS is increasingly used in systems with high requirements for signal integrity, low jitter and common mode characteristics, and the driver circuit of an LVDS display and its PCB wiring design also have higher and more stringent requirements than a common interface display.

Disclosure of Invention

In order to solve the technical problems provided by the background art, the utility model provides a TFT display driving device with an anti-interference TYPE TYPE-C interface, wherein the interface of a signal receiving end of the TFT display driving device adopts the TYPE-C interface, the TFT display driving device has the functions of power supply, audio signal integration, video signal integration and anti-reverse insertion, LVDS signals are adopted on output signals of a display, the radiation emission quantity of a circuit is reduced, meanwhile, a laminated structure of four layers of circuit boards is adopted, and grounding via holes around LVDS signal wiring are matched, so that the EMI protection problem can be effectively solved, and the problems of packet loss and distortion of the LVDS signals are avoided.

In order to achieve the purpose, the utility model adopts the following technical scheme:

the utility model provides a TFT display driver of anti-interference TYPE TYPE-C interface, driver's electric element include TYPE-C interface, power module, TYPE-C change LVDS signal conversion chip, LVDS display signal output port, audio signal output port.

The input end of the TYPE-C to LVDS signal conversion chip is connected with the signal end of the TYPE-C interface, the drive signal from the outside is received through the TYPE-C interface, and the output end of the TYPE-C to LVDS signal conversion chip is respectively connected with the LVDS display signal output port and the audio signal output port; the LVDS display signal output port is connected to the TFT display; the input end of the power supply module is connected with the power supply end of the TYPE-C interface, and the output end of the power supply module is also connected to the TFT display.

The driving device is a laminated structure of four layers of circuit boards; the low voltage differential signaling device comprises an electric element layer, a power supply wiring layer, a ground layer and an LVDS signal wiring layer from top to bottom; mounting an electric element on the electric element layer; the LVDS signal wiring layer is provided with low-voltage differential wiring, and grounding via holes are uniformly arranged around the low-voltage differential wiring and are electrically connected with the grounding layer.

Furthermore, the low-voltage differential routing adopts equal-length wiring of a network of snake-shaped routing.

Further, the conversion chip for converting TYPE-C into LVDS is LT 7211D.

Further, the power supply module comprises a PDZ5.6V voltage regulator tube of DC5V, a DC3.3V power supply voltage regulation chip AMS1117 and a DC1.2V power supply voltage regulation chip TMI 111; the power supply module receives DC5V power from the TYPE-C interface and provides DC5V, DC3.3V and DC1.2V for powering the device itself and the TFT display.

Compared with the prior art, the utility model has the beneficial effects that:

1) the interface of the signal receiving end is a TYPE-C interface, and has the functions of power supply, audio and video signal integration and anti-reverse insertion; the power supply audio and video signals are respectively output through a TYPE-C to LVDS signal conversion chip and a power supply module;

2) LVDS signal transmission is adopted on signals output to the display, so that the radiation emission quantity of a circuit is reduced, the transmission speed is improved, and the display can support higher resolution;

3) the utility model adopts a laminated structure of four layers of circuit boards and is matched with the grounding via holes around the LVDS signal wires, and the problems of EMI protection can be effectively solved by adopting equal-length network wiring during wiring so as to avoid the problems of packet loss and distortion of the LVDS signals.

4) The LVDS low-voltage differential wiring adopts a snake-shaped network equal-length wiring form, so that the signal accuracy and the anti-interference capability are improved.

Drawings

FIG. 2 is a component circuit configuration diagram of the electrical component layer of the present invention;

FIG. 1 is a laminated structure view of a four-layer circuit board of the present invention;

FIG. 3 is a diagram of an LVDS routing layer according to the present invention;

FIG. 4 is a circuit diagram of the TYPE-C interface of the present invention;

FIG. 5 is a circuit diagram of a TYPE-C to LVDS signal conversion chip according to the present invention;

FIG. 6 is a circuit diagram of an LVDS display signal output port of the present invention;

FIG. 7 is a circuit diagram of the audio signal output port of the present invention;

fig. 8 is a circuit diagram of a power module of the present invention.

In the figure: 1-electrical component layer (including traces between components) 2-power trace layer 3-ground layer 4-LVDS signal trace layer 5-solder mask layer 6-epoxy layer 7-Low Voltage Differential Signaling (LVDS) trace 8-ground via 9-serpentine trace portion.

Detailed Description

The following detailed description of the present invention will be made with reference to the accompanying drawings.

As shown in fig. 1, an electrical component on an electrical component mounting board of the TFT display driving apparatus with an anti-interference TYPE-C interface includes a TYPE-C interface, a power supply module, a TYPE-C to LVDS signal conversion chip, an LVDS display signal output port, and an audio signal output port.

As shown in fig. 2, the driving device is a laminated structure of four layers of circuit boards; the device comprises an electric element layer 1, a power supply wiring layer 2, a ground layer 3 and an LVDS signal wiring layer 4 from top to bottom.

The electric element layer 1 is provided with electric elements; the installed electric elements comprise the TYPE-C interface, a power supply module, a TYPE-C to LVDS signal conversion chip, an LVDS display signal output port and an audio signal output port.

As shown in fig. 3, a low voltage differential trace 7 is disposed on the LVDS signal trace layer 4, a ground via 8 is uniformly perforated around the low voltage differential trace 7, and the ground via 8 is electrically connected to the ground layer 3.

As shown in fig. 3, the low voltage differential routing 7 adopts the equal length network routing of the serpentine routing, the 5 low voltage differential routing 7 in the figure are arranged from top to bottom, because the layout positions are different, the occupied space lengths are different, in order to achieve the equal length network routing, the serpentine routing mode is adopted, the length of the serpentine routing portion 9 of each low voltage differential routing 7 is different according to the layout position thereof, and finally the equal length network routing of the 5 low voltage differential routing 7 from top to bottom is achieved.

As shown in fig. 4-8, are electrical diagrams of the present embodiment. FIG. 4 shows a TYPE-C interface, which includes power terminals USBD + and USBD-and signal terminals, except for USBD + and USBD-and VBUS, GND, and signal ports.

Fig. 5 shows a TYPE-C to LVDS signal conversion chip, which uses LT7211D, a part of its ports are connected to the TYPE-C interface of fig. 4 (the reference numbers correspond to fig. 4), and another part of the ports are connected to the LVDS display signal output port J1+ J2 of fig. 6 and the audio DAC chip CS4344 of fig. 7, respectively, and are connected to the audio signal output port through CS 4344.

FIG. 8 is a circuit diagram of a power module including a PDZ5.6V voltage regulator tube for DC5V, a DC3.3V power supply regulator chip for AMS1117, and a DC1.2V power supply regulator chip for TMI 111. The power supply module receives DC5V power from the TYPE-C interface and provides DC5V, DC3.3V and DC1.2V for powering the device itself and the TFT display.

The above embodiments are implemented on the premise of the technical solution of the present invention, and detailed embodiments and specific operation procedures are given, but the scope of the present invention is not limited to the above embodiments. The methods used in the above examples are conventional methods unless otherwise specified.

Claims

1. The TFT display driving device of the anti-interference TYPE TYPE-C interface is characterized in that electrical elements of the driving device comprise a TYPE-C interface, a power supply module, a TYPE-C to LVDS signal conversion chip, an LVDS display signal output port and an audio signal output port;

the input end of the TYPE-C to LVDS signal conversion chip is connected with the signal end of the TYPE-C interface, the drive signal from the outside is received through the TYPE-C interface, and the output end of the TYPE-C to LVDS signal conversion chip is respectively connected with the LVDS display signal output port and the audio signal output port; the LVDS display signal output port is connected to the TFT display; the input end of the power supply module is connected with the power supply end of the TYPE-C interface, and the output end of the power supply module is also connected to the TFT display;

2. The TFT display driver of an anti-interference TYPE TYPE-C interface of claim 1, wherein the low voltage differential routing is routed with equal length by a network of serpentine routing.

3. The TFT display driving device of an anti-interference TYPE TYPE-C interface of claim 1, wherein the TYPE-C to LVDS signal conversion chip is LT 7211D.

4. The TFT display driver of claim 1, wherein the power supply module comprises a PDZ5.6V voltage regulator tube of DC5V, a DC3.3V power supply voltage regulator chip AMS1117, a DC1.2V power supply voltage regulator chip TMI 111; the power supply module receives DC5V power from the TYPE-C interface and provides DC5V, DC3.3V and DC1.2V for powering the device itself and the TFT display.