CN105812702A - Device and method for converting DP (Display Port) image signals into LVDS (Low-Voltage Differential Signaling) image signals - Google Patents
Device and method for converting DP (Display Port) image signals into LVDS (Low-Voltage Differential Signaling) image signals Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/01—Conversion of standards, e.g. involving analogue television standards or digital television standards processed at pixel level
- H04N7/0125—Conversion of standards, e.g. involving analogue television standards or digital television standards processed at pixel level one of the standards being a high definition standard
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/01—Conversion of standards, e.g. involving analogue television standards or digital television standards processed at pixel level
- H04N7/0127—Conversion of standards, e.g. involving analogue television standards or digital television standards processed at pixel level by changing the field or frame frequency of the incoming video signal, e.g. frame rate converter
Abstract
The invention discloses a device and method for converting DP (Display Port) image signals into LVDS (Low-Voltage Differential Signaling) image signals. The method comprises following steps of 1), receiving DP auxiliary channel signals and DP image data signals; analyzing the DP auxiliary channel signals, thus obtaining DP data channel physical layer coding information; analyzing the DP image data signals, thus obtaining DP data channel quantity information; 2), carrying out physical layer decoding on the DP image data signals according to the DP data channel physical layer coding information, thus obtaining a DP image data packet; 3), converting the DP image data packet into RGB signals according to the DP data channel quantity information; 4), segmenting the RGS signals into multilink RGB signals according to an LVDS configuration instruction; and 5), converting the multilink RGB signals into multilink LVDS image signals. According to the method and the device, DP signal inputs of all specifications and standards can be supported; LVDS signal outputs of multilink transmission modes can be supported; and the electrical parameters of the output LVDS signals are not influenced by the DP signals.
Description
Technical field
The present invention relates to technical field of image signal processing, convert the device and method of LVDS picture signal in particular to a kind of DP picture signal to.
Background technology
DP interface (DisplayPort) is a kind of novel image display interface, it is possible not only to support common full HD display resolution (1920 × 1080), can also supporting 4k resolution (3840 × 2160), newest standards even supports 8k resolution (7680 × 4320).DP interface not only transfer rate is high, and reliable and stable, and state, the auxiliary channel signal of control information that its interface is correlated with by the data channel signal and transmission image that transmit image form, and be increasingly becoming actual follow-on display interface standard.
But the liquid crystal display module of main flow remains in the interface standard of LVDS signal (Low-VoltageDifferentialSignaling low-voltage differential signal) due to a variety of causes such as production, technology, price, Consumers' Acceptances in the market, because LVDS signal standards is very ripe, picture display effect also relatively good, working stability, and by adopting many link transmission means such as single link (link), double; two link, four link, eight link can show the image of the various resolution such as various full HD, 4k ultra high-definitions equally.And novel, kind high with its price of liquid crystal display module receiving DP signal and manufacturer is less, display effect and stability all not good enough.
A kind of equipment comes for showing image on LVDS liquid crystal display module for this reason, it may be necessary to can convert the various DP picture signals of input to can transmit different qualities LVDS picture signal.Chinese utility model patent CN201420370436.5 discloses a kind of EDP interface and turns LVDS interface card, this interface conversion card is based on what the interface conversion chip that EDP signal can be converted to LVDS signal realized, restriction due to conversion chip, this interface conversion card can not support the DP signal input of all specifications, standard, and the electrical parameter of the LVDS signal of output is subject to the restriction of DP signal.
Summary of the invention
For above-mentioned the deficiencies in the prior art, a kind of DP picture signal of disclosure converts the device and method of LVDS picture signal to, the present invention can support the DP signal input of all specifications, standard, the LVDS signal of multiple link transmission mode can be exported, and the electrical parameter of the LVDS signal of output is not by the impact of DP signal.
Realizing the object of the invention and be the technical scheme is that a kind of DP picture signal converts the device of LVDS picture signal to, this device includes the control module, DP accessory channel parsing module, DP data channel parsing module, DP view data Packet analyzing module, rgb signal modular converter, LVDS transmission link segmentation module and the LVDS picture signal modular converter that are arranged in a PLD；
Described DP accessory channel parsing module is used for receiving DP auxiliary channel signal, and resolves described DP auxiliary channel signal and obtain DP data channel physical layer coding information；
Described DP data channel parsing module is used for receiving DP viewdata signal, and resolves described DP viewdata signal and obtain DP data channel quantity information；
Described DP viewdata signal is resolved to DP view data bag for encoding information according to described DP data channel physical layer by described DP view data Packet analyzing module；
Described rgb signal modular converter is for converting described DP view data bag to rgb signal according to described DP data channel quantity information；
Described LVDS transmission link segmentation module is for being divided into multilink rgb signal by described rgb signal；
Described LVDS picture signal modular converter is for converting described multilink rgb signal to multilink LVDS picture signal；
Described control module is for realizing the transmission of the control instruction to all functional modules in described PLD and issuing.
Preferably, in such scheme, the multilink LVDS picture signal of stating of output is configured by number of links that described LVDS picture signal modular converter issues according to described control module, transmission coded system, color range bit position, the transmission configuration parameter such as driving force and preemphasis.
Additionally, the present invention also provides for a kind of method that DP picture signal converts LVDS picture signal to, the method includes:
Step 1: receive DP auxiliary channel signal and DP viewdata signal；Resolve described DP auxiliary channel signal and obtain DP data channel physical layer coding information, resolve described DP viewdata signal and obtain DP data channel quantity information；
Step 2: according to described DP data channel physical layer coding information, described DP viewdata signal is carried out physical layer decoding process and obtain DP view data bag；
Step 3: convert described DP view data bag to rgb signal according to described DP data channel quantity information；
Step 4: described rgb signal is divided into multilink rgb signal according to LVDS configuration order；
Step 5: convert described multilink rgb signal to multilink LVDS picture signal.
The invention have the advantages that
(1) 1 road DP picture signal can be converted to the LVDS picture signal of multiple link transmission pattern by the present invention.
(2) present invention can support the input of the DP picture signal of all specifications, standard, it is possible to automatically identifies the data channel number of DP picture signal, message transmission rate (DP1.1 standard data rate is 2.7Gbps, DP1.2 standard data rate is 5.4Gps).
(3) associated control parameters (as LVDSlink number, VESAJEIDA transmit coded system, LVDS color range bit position, transmission driving force, preemphasis etc.) of the LVDS picture signal that the present invention exports all can be arranged by upper layer software (applications), unrelated with DP picture signal, LVDS exports the electrical parameter of signal by the impact of DP input signal.
Accompanying drawing explanation
Fig. 1 is the apparatus structure block diagram that DP picture signal of the present invention converts LVDS picture signal to.
Fig. 2 is the method flow diagram that DP picture signal of the present invention converts LVDS picture signal to.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
The PLD of the present embodiment selects FPGA.
As shown in Figure 1, the device that a kind of DP picture signal disclosed by the invention converts LVDS picture signal to includes the control module (1) being arranged in a fpga chip, DP accessory channel parsing module (2), DP data channel parsing module (3), DP view data Packet analyzing module (4), rgb signal modular converter (5), LVDS transmission link segmentation module (6), LVDS picture signal modular converter (7), transmission sequence synchronization module (8) and hot plug detection module (9), wherein, hot plug detection module (9) is connected with outside DP image signal source, LVDS picture signal modular converter (7) is connected with LVDS module to be measured, control module (1) to be connected with host computer.
In above-described embodiment, DP accessory channel parsing module (2) includes DP accessory channel termination matching module, physical layer transmission decoder module and formation-decoding module；DP data channel parsing module (3) includes DP data channel termination matching module, data channel quantity detection module and transfer rate detection module；DP view data Packet analyzing module (4) includes data channel clock and recovers module, physical layer transmission decoder module and data transmission descrambling module；Rgb signal modular converter (5) includes view data solution module, image header parser module, rgb image data bag decoder module, RGB image sequence generation module, rgb image data cache module, RGB image generation module；LVDS transmission link segmentation module (6) includes rgb signal cache module, LVDS data link segmentation module and LVDS image transmitting coding module；LVDS picture signal modular converter (7) includes LVDS image transmitting string module and LVDS picture signal output module；Transmission sequence synchronization module (8) includes image transmitting synchronizing sequence detection module and image-receptive synchronization module.
Below in conjunction with Fig. 2, the signal conversion process of above-described embodiment is described further.
In above-described embodiment, LVDS transmission configuration parameter and LVDS sequential configuration parameter are handed down to control module (1) by host computer after apparatus of the present invention power on.
In above-described embodiment, hot plug detection module (9) is for receiving DP auxiliary channel signal and the DP viewdata signal of outside DP image signal source transmission, and detect DP auxiliary channel signal and DP viewdata signal connection status Real-time Feedback give control module (1), when the connection shape of DP auxiliary channel signal and DP viewdata signal is normal, control module (1) can start other functional modules and carry out the conversion operation of corresponding signal, otherwise can stop the signal conversion operation of other functional modules, thus avoiding outside incoming apparatus of the present invention of noise signal to cause the interference to output LVDS signal.
In above-described embodiment, receive DP auxiliary channel signal and DP viewdata signal when hot plug detection module (9) after, DP auxiliary channel signal and DP viewdata signal are by DP accessory channel termination matching module respectively and DP data channel termination matching module subsequently.DP auxiliary channel signal is terminated coupling by DP accessory channel termination matching module, thus sending into physical layer transmission decoder module after receiving the DP auxiliary channel signal of the best to carry out physics decoding operation, thus restoring DP secondary channel data, then these data feeding formation-decoding module resolves, and sends into and control in module (1) after obtaining DP data channel physical layer coding information and DP data channel scrambling scrambling sequence.DP viewdata signal is terminated coupling, equalization operation by DP data channel termination matching module, recover in module thus being respectively fed to data channel quantity detection module, transfer rate detection module and data channel clock after receiving the DP viewdata signal of the best, the data channel quantity sending into signal is detected by data channel quantity detection module, and testing result is sent into control module (1), the message transmission rate sending into signal is detected by transfer rate detection module simultaneously, and testing result is sent into control module (1).Due to the DP signal standards that different message transmission rates is corresponding different, therefore apparatus of the present invention may identify which that DP inputs the DP standard of signal.
In above-described embodiment, after data channel clock recovery module receives the DP viewdata signal that DP data channel termination matching module sends, control module (1) and issue the message transmission rate of transfer rate detection module feedback to data channel clock recovery module, data channel clock recovers module and recovers the reception clock of each data channel of DP according to message transmission rate, the each data channel of DP receives clock recovery according to it and goes out the transmission data (thus overcoming data distortion in transmitting procedure) in each data channel of DP and to the DP viewdata signal after physical layer transmission decoder module output calibration.After physical layer transmission decoder module receives the DP viewdata signal after correction, according to the DP data channel physical layer coding information that control module (1) issues, DP viewdata signal being carried out physical layer decoding operation, output DP view data bag transmits descrambling module to data.The DP view data bag received is carried out scramble process according to controlling module (1) the DP data channel scrambling scrambling sequence that issues by data transmission descrambling module, and DP view data bag after being unscrambled also sends into image transmitting synchronizing sequence detection module.
In above-described embodiment, the transmission sequence of the image transmitting synchronizing sequence detection module DP view data bag to receiving detects, and compare with controlling module (1) the transmission sequence that issues, when the transmission sequence of DP view data bag meets the transmission sequence that control module (1) issues, DP view data bag can be carried out synchronization process by image-receptive synchronization module, and the DP view data bag after synchronization process is sent into view data solution module.The DP view data bag received is carried out de-packaging operation by view data solution module, obtains the view data in header packet information and bag, and is respectively fed to image header parser module, rgb image data bag decoder module.Data packet head is resolved the decoded information obtaining data packet head by image header parser module and command word is sent into and controlled module (1), control module (1) according to these command words, decoded information and DP data channel quantity control rgb image data bag decoder module and complete the decoding operation of DP data, thus obtaining rgb image data, it is sent to rgb image data cache module again and carries out buffer memory, simultaneously, control module (1) and issue LVDS time sequence parameter to RGB image sequence generation module, RGB image sequence generation module produces corresponding RGB clock signal (VSync according to LVDS time sequence parameter, HSync, and send into RGB image generation module DE).The view data of rgb image data cache module buffer memory, under RGB clock signal controls, is taken out by RGB image generation module, thus exporting into the RGB image signal of standard, and sends into rgb signal cache module and carries out buffer memory.
In above-described embodiment, LVDS data link segmentation module carries out link dividing processing according to the RGB image signal controlling the LVDS number of links reading rgb signal cache module that module (1) issues, and being divided into what RGB clock signal synchronized in each data link simultaneously.LVDS image transmitting coding module is according to controlling LVDS transmission coded system (such as VESA, JEIDA), the color range bit (6bit, 8bit, 10bit, 12bit) that module (1) issues, described multilink rgb signal is encoded, and output multilink LVDS encodes data.
In above-described embodiment, LVDS image transmitting string module is transmitted parameter (as LVDS clock transfer bit pattern, LVDS transmit the stringization factor etc.) according to the LVDS that control module (1) issues and multilink LVDS coding data is carried out stringization process, output multilink LVDS picture signal；LVDS picture signal output module transmits parameter (as LVDS drives intensity, LVDS preemphasis, LVDS to export impedance, LVDS output time delay etc.) according to the LVDS that control module (1) issues and multilink LVDS picture signal is adjusted, and exports the multilink LVDS picture signal after adjusting to LVDS module to be measured.
The content that this specification is not described in detail belongs to the known prior art of professional and technical personnel in the field.Those skilled in the art will readily understand; the foregoing is only presently preferred embodiments of the present invention; not in order to limit the present invention, all any amendment, equivalent replacement and improvement etc. made within the spirit and principles in the present invention, should be included within protection scope of the present invention.
Claims (10)
1. a DP picture signal converts the device of LVDS picture signal to, it is characterized in that, including the control module (1) being arranged in a PLD, DP accessory channel parsing module (2), DP data channel parsing module (3), DP view data Packet analyzing module (4), rgb signal modular converter (5), LVDS transmission link segmentation module (6) and LVDS picture signal modular converter (7)；Wherein,
Described DP accessory channel parsing module (2) is used for receiving DP auxiliary channel signal, and resolves described DP auxiliary channel signal and obtain DP data channel physical layer coding information；
Described DP data channel parsing module (3) is used for receiving DP viewdata signal, and resolves described DP viewdata signal and obtain DP data channel quantity information；
Described DP viewdata signal is resolved to DP view data bag for encoding information according to described DP data channel physical layer by described DP view data Packet analyzing module (4)；
Described rgb signal modular converter (5) is for converting described DP view data bag to rgb signal according to described DP data channel quantity information；
Described LVDS transmission link segmentation module (6) is for being divided into multilink rgb signal by described rgb signal；
Described LVDS picture signal modular converter (7) is for converting described multilink rgb signal to multilink LVDS picture signal；
Described control module (1) is for realizing the transmission of the control instruction of all functional modules in described PLD and issuing.
2. DP picture signal according to claim 1 converts the device of LVDS picture signal to, it is characterized in that, described DP accessory channel parsing module (2) includes DP accessory channel termination matching module, physical layer transmission decoder module and formation-decoding module；Wherein,
Described DP accessory channel termination matching module is for coupling that described DP auxiliary channel signal is terminated；
Described physical layer transmission decoder module, for the DP auxiliary channel signal after coupling is carried out physics decoding, restores DP secondary channel data；
Described formation-decoding module, for described DP secondary channel data is carried out data parsing, obtains described DP data channel physical layer coding information.
3. DP picture signal according to claim 2 converts the device of LVDS picture signal to, it is characterised in that described DP data channel parsing module (3) includes DP data channel termination matching module, data channel quantity detection module；Wherein,
Described DP data channel termination matching module is for coupling that described DP viewdata signal is terminated；
Described data channel quantity detection module obtains described DP data channel quantity information for the DP viewdata signal after detecting coupling.
4. DP picture signal according to claim 3 converts the device of LVDS picture signal to, it is characterized in that, described DP data channel parsing module (3) also includes transfer rate detection module, and described DP view data Packet analyzing module (4) includes data channel clock and recovers module and physical layer transmission decoder module；Wherein,
Described transfer rate detection module obtains DP message transmission rate for the DP viewdata signal after detecting coupling；
Described data channel clock recovers the DP viewdata signal after module receives coupling and recovers the reception clock of DP data channel, the DP viewdata signal after output calibration according to described DP message transmission rate；
DP viewdata signal after described correction is carried out physical layer decoding for encoding information according to described DP data channel physical layer by described physical layer transmission decoder module, exports DP view data bag.
5. DP picture signal according to claim 4 converts the device of LVDS picture signal to, it is characterised in that described formation-decoding module is additionally operable to described DP secondary channel data is carried out data parsing, obtains DP data channel scrambling scrambling sequence；Described DP view data Packet analyzing module (4) also includes data transmission descrambling module；Wherein,
Described data transmission descrambling module is used for, according to described DP data channel scrambling scrambling sequence, described DP view data bag is carried out scramble process, the DP view data bag after being unscrambled.
6. DP picture signal according to claim 5 converts the device of LVDS picture signal to, it is characterized in that, described LVDS transmission link segmentation module (6) includes rgb signal cache module, LVDS data link segmentation module and LVDS image transmitting coding module；Wherein,
Described rgb signal cache module is rgb signal described in buffer memory；
Described LVDS data link segmentation module is for being divided into multilink rgb signal by described rgb signal；
Described LVDS image transmitting coding module is for being encoded described multilink rgb signal, and output multilink LVDS encodes data.
7. DP picture signal according to claim 6 converts the device of LVDS picture signal to, it is characterised in that described LVDS picture signal modular converter (7) includes LVDS image transmitting string module and LVDS picture signal output module；Wherein,
Described LVDS image transmitting string module carries out stringization process for described multilink LVDS encodes data, exports multilink LVDS picture signal；
Described LVDS picture signal output module, for described multilink LVDS signal is transmitted Mass adjust-ment, exports the multilink LVDS picture signal after adjusting.
8. DP picture signal according to claim 7 converts the device of LVDS picture signal to, it is characterized in that, also include transmission sequence synchronization module (8) being arranged in described PLD, described transmission sequence synchronization module (8) is for detecting the transmission sequence of described DP view data bag, and the transmission sequence of described DP view data bag is carried out synchronization process.
9. DP picture signal according to claim 8 converts the device of LVDS picture signal to, it is characterized in that, also include the hot plug detection module (9) being arranged in described PLD, described hot plug detection module (9) is used for inputting described DP auxiliary channel signal and described DP viewdata signal, and to the input state of DP auxiliary channel signal and described DP viewdata signal described in described control module (1) Real-time Feedback.
10. the method that a DP picture signal converts LVDS picture signal to, it is characterised in that comprise the following steps:
Step 1: receive DP auxiliary channel signal and DP viewdata signal；Resolve described DP auxiliary channel signal and obtain DP data channel physical layer coding information, resolve described DP viewdata signal and obtain DP data channel quantity information；
Step 2: according to described DP data channel physical layer coding information, described DP viewdata signal is carried out physical layer decoding process and obtain DP view data bag；
Step 3: convert described DP view data bag to rgb signal according to described DP data channel quantity information；
Step 4: described rgb signal is divided into multilink rgb signal according to LVDS configuration order；
Step 5: convert described multilink rgb signal to multilink LVDS picture signal.
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