CN100595827C - LVDS drive card based on multimedia integration projector and control method - Google Patents

Abstract

The invention discloses an LVDS driving card and a control method thereof based on a multimedia integrated projector, and relates to the technical field of a projector and an industrialized microcomputer. The LVDS driving card and the control method are characterized in that the LVDS driving card is arranged between the main board of the traditional projector of the integrated projector and the main board of the push-in type industrialized microcomputer; and the LVDS driving card is composed of a LVDS reception module, a DVI drive module, a CPU operation module and a VGA drive module, as wellas a control method of the LVDS driving card, namely a process module encapsulated in FLASH ROM for carrying out power turn-on initialization, configuring a high-definition image channel and detectingHOTSENSOR. The conversion from LVDS data to LVTTL data and the conversion from LVTTL data to DVI data based on TMDS coding can be finished; and the analog conversion from LVTTL data to a VGA channelcan be finished simultaneously. The LVDS driving card and the control method has the advantages that a fully-digitized transmitting high-definition display data channel is provided for the traditionalprojector, and the problem that the signal distortion happens to traditional VGA signal after being converted by DA/AD is overcome, thereby satisfying the requirements of playing high-definition video signals of teaching resources, films, DVD, etc., and achieving the convenient operation of 'plug and play'.

Description

A kind of LVDS driver card and control method based on multimedia integration projector

Technical field

The present invention relates to projector and industrialization Microcomputer Technology, especially a kind of LVDS driver card and control method based on multimedia integration projector.

Background technology

Along with the progressively appearance of home projector and the continuous maturation of digital television techniques, use projector to watch high definition television also just progressively to popularize.But when people use traditional projector, often need time-consuming take a lot of work carry out certain operations, when particularly being connected, can't accomplish that " plug and play " operate very easily with computing machine or laptop computer.Because traditional projector must be equipped with computer when the play multimedia resource or other broadcast source connects and could normally use, therefore in many instances, owing to can't providing computer or other broadcast source, condition restriction cause traditional projector can not playing image.There was the inventor of No. 20031012289.8 patents of China once to utilize universal embedded universal serial bus to start the imagination report that the multimedia overhead projector instrument overcomes this defective, but probe into its technical characterictic only is to utilize system's carrier to adopt USB (universal serial bus) (USB) flash memory, and Mobile operating system adopts (SuSE) Linux OS to realize; And this patent also exists the defective that just can not bring into play its effect when needing to revise playing resource because technical limitation own can only be play some video resources.Purpose of the present invention overcomes the problems referred to above exactly, provides a multifunctional product to make it to be mainly used in to play high definition vision signals such as teaching resource, film, DVD, simultaneously can real time modifying to the content false found in the playing process; And install, use multimedia integration projector easy to operate.Need allow traditional projector and built-in industrial micro computer combine in order to reach this purpose, in this course, say the high definition DDC how the total digitalization transmission to be provided for traditional projector technically, and avoided of the puzzlement of traditional VGA signal through digital-to-analogue conversion, the signal content loss distortion of analog digital conversion back.A kind of LVDS driver card and control method based on multimedia integration projector disclosed by the invention solved this problem preferably.

Summary of the invention

The purpose technology solution that realizes the present invention is as follows:

A kind of LVDS driver card and control method based on multimedia integration projector, it is characterized in that, this LVDS driver card comprises LVDS receiver module, DVI driver module, CPU computing module, VGA driver module, described CPU computing module is connected with LVDS receiver module, DVI driver module by pin, and described LVDS receiver module is connected with the VGA driver module by pin; Described LVDS driver card one end is connected by the DVI interface of the digital video signal matrix commutation circuit on DVI interface and the projector mainboard, and the other end passes through the LVDS interface and is connected with built-in industrial micro computer mainboard.

A kind of control method according to described LVDS driver card based on multimedia integration projector, its feature comprises the steps:

(1) electrifying startup, after the start, LVDS interface 23 from the micro computer mainboard, the 5V voltage that 24,25,26 pin provide is supplied with the LVDS driver card, LVDS driver card builtin voltage voltage stabilizer LDO, conversion 5V voltage also offers master cpu, and chip reset is started working, and 5V voltage offers conventional passage VGA pio chip ADV7120 voltage after by filtering circuit simultaneously;

(2) the beginning initialization operation begins to carry out the initialization operation program, the configuration effort dominant frequency behind the master cpu chip reset; Finish internal RAM space initialization operation, dispose each interface I/O running parameter;

(3) configuration display register parameter is passed through I ²The C data bus is provided with high definition display channel basic parameter;

(4) configuration pin state level forbids showing output, and the relevant I/O pin of master cpu chip configuration realizes and peripheral chip connects;

(5) configuration high definition passage shows and configuration standard passage video data startup VGA output, and data start VGA output; Master cpu passes through I after detecting the terminal access ²C DDC passage reads projector's display parameter, according to the DDC channel data, rationally adjusts high-definition image output clock frequency, synchronizing cycle and image quality resolution parameter;

(6) detect the HOTSENSOR state,, read projector's configuration, DDC channel data, display resolution is set if signal is arranged; If do not have signal then return and continue to detect HOTSENSOR;

(7) show that by DVI interface output high-resolution the TMDS signal is to projector.

Implement according to above-mentioned measure scheme, the present invention has produced very positive effect and characteristics.The said driver card of the present invention can be finished the LVDS data to the LVTTL data-switching, and the LVTTL data are finished the analog-converted of LVTTL data to the VGA passage simultaneously to the high definition DVI data-switching based on the TMDS coding.After compatibility conversion, built-in industrial micro computer and traditional projector are combined, for traditional projector provides the high definition DDC of totally digitilized transmission, overcome traditional VGA signal through digital-to-analogue conversion, the problem of analog digital conversion back loss of signal distortion.Its effect of its two multimedia integration projector mainly on the multimedia performance, adopts unique LVDS driver card to make the effect of broadcast smooth more, satisfies high definition vision signals such as playing teaching resource, film, DVD.It three is that integration projector is started by the booting operating system that is contained in advance in hard disk or the electric board when starting, and promptly begins the initialization of projector's parts after system start-up is finished, and enters duty after initialization is finished.Accomplished that fully " plug and play " and system support remote-controlled start-up/shutdown/standby, operating aspect is all very convenient installing, using.Realized the purpose of integrating traditional projector and micro computer multimedia integration projector multifunctional product together.

Description of drawings

Fig. 1 is the structural representation block diagram of the said LVDS driver card of the present invention in integration projector

Fig. 2 is the structural representation block diagram of the said LVDS driver card of the present invention

Fig. 3 is the circuit diagram of the CPU module of the said LVDS driver card of the present invention

Fig. 4 is the circuit diagram of the said formation of the present invention LVDS receiver module

Fig. 5 is the circuit diagram of the said formation of the present invention DVI module

Fig. 6 is the circuit diagram of the said formation of the present invention VGA module

Fig. 7 is the said LVDS driver card of a present invention software flow synoptic diagram

Fig. 8 is the LVDS driver card layout among the said LVDS driver card of the present invention embodiment

Wherein numeral and letter representation:

1, projector image is handled and driving circuit

2, optical imagery part

3, electrical control and interface section

4, built-in industrial microcomputer system mainboard

7, integrated graphics is handled and graphics accelerator

8, the LVDS conversion of signals is to the required LVDS driver card of TMDS signal

HOTSENSO: the online signal of projector and micro computer, dynamic area sub-signal during as integration projector and the signal use of common projector.

Embodiment

Provide embodiment in conjunction with the accompanying drawings and the present invention is made specific description.

From Fig. 1 Fig. 2 as can be seen the locations of structures of the said LVDS driver card of the present invention integration projector be between traditional projector mainboard and built-in industrial microcomputer system mainboard, one end of LVDS driver card is connected by the DVI interface of the digital video signal matrix commutation circuit on DVI interface and the traditional projector mainboard, and the other end passes through the LVDS interface and is connected with built-in industrial micro computer mainboard.LVDS interface on its micro computer mainboard is the LVDS interface of double 40 pins, marks out in the accompanying drawing 4.Said LVDS driver card comprises LVDS receiver module, DVI driver module, CPU computing module, VGA driver module.The preferred IC chip of various module is respectively in the present embodiment: LVDS receiver module, the preferably a list of Thine company/binary channels LVDS receiving chip THC63LVD824; In its circuit, mainly finish receiving the LVDS signal, and export R, G, B trichromatic vision audio data and image control signals such as HSYNC, VSYNC, DCLK with the form of LVTTL.The DVI driver module, SIL1160 chip preferably promptly is a list/binary channels TMDS of the SilicomImage company IC that encodes.Support the high performance-price ratio TMDS coding special IC of bandwidth 25-165MHz (resolution of VGA-UXGA).The SIL1160 chip is mainly finished the output of TTL data to the TMDS coded data in its circuit, by the digital signal of DVI interface output based on the TMDS coding.The CPU computing module, what select for use is the high arithmetic speed of Silconlabs company, based on the C8051F340 chip of 51 instruction set, this cpu chip is supported most of one-cycle instruction, and maximum can move to the clock frequency of 48MHz, and band 64K FLASH storer is 4K SRAM in the sheet.In its circuit, the C8051F340 chip mainly is responsible for application configuration and state and is switched.In the FLASH of C8051F340 ROM, preserve initialize routine and register configuration program, Automatic Program operation behind the electrification reset.VGA driver module, VGA driver module comprise VGA clock generator and VGA driver.That the VGA clock generator is selected for use is the MAX II series CPLD chip EPM240T100 of the third generation of ALTERA company based on FLASH technology; This chip has 240 groups of logic macrocells, adopts the TQFP100 packing forms.The main drive clock that produces the conventional passage of VGA in circuit drives VGA chip operate as normal.That the VGA driver is selected for use is special-purpose VGA drive IC-ADV7120, and running frequency can reach 80MHz@XGA resolution.Can under clock control, convert the output of VGA simulating signal to the LVTTL video data stream and form interface signal to display.Described LVDS receiver module is connected with the VGA driver module by pin.Find out that from Fig. 3 Fig. 4 Fig. 5 described CPU computing module C8051F340 chip is connected with 4,5,6,8, the 9 pin pins of LVDS receiver module THC63LVD824 by pin P3.1～P3.5; Be connected with 20,23,24,25,87,21 pin pins of DVI driver module SIL1160 chip by pin P0.0～P0.5.Fig. 6 is the VGA clock generator of said formation VGA module and the circuit diagram of VGA driver EPM240T100 chip and IC-ADV7120 chip; Fig. 8 has provided the embodiment of the in type layout of the said LVDS driver card of the present invention.Fig. 7 is the said LVDS driver card of a present invention software flow synoptic diagram, following as seen from the figure workflow:

(1) electrifying startup, after the start, LVDS interface 23,24,25 from the micro computer mainboard, the 5V voltage that 26 pin provide is supplied with the LVDS driver card, LVDS driver card builtin voltage voltage stabilizer LDO (model LM1117-3.3) change into 3.3V voltage give master cpu chip C8051F340 and other chip (model: THC63LVD824, SII1160, EPM240T100), the master cpu chip reset is started working, and simultaneously 5V voltage offers conventional passage VGA pio chip ADV7120 voltage after by filtering circuit.

(2) the beginning initialization operation begins to carry out the initialization operation program, the configuration effort dominant frequency behind the master cpu chip reset; Finish internal RAM space initialization operation, dispose each interface I/O running parameter.

(3) configuration display register parameter is passed through I ²The C data bus is provided with high definition display channel basic parameter.

(4) configuration pin state level forbids showing output, and the relevant I/O pin of master cpu chip configuration realizes and peripheral chip connects.

(5) configuration high definition passage shows and the demonstration of configuration standard passage, and data start VGA output.Master cpu passes through I after detecting the terminal access ²C DDC passage reads projector's display parameter, according to the DDC channel data, rationally adjusts high-definition image output clock frequency, synchronizing cycle, image quality resolution parameter.

(6) detect the HOTSENSOR state,, read projector's configuration, DDC channel data, display resolution is set if signal is arranged; If do not have signal then return previous step and continue to detect HOTSENSOR.

(7) show that by DVI interface output high-resolution the TMDS signal is to projector.High-definition image is sent in the projector by the DVI passage after being encoded into the TMDS signal through the SII1160 chip.Standard channel VGA data are touched conversion by the ADV7120 chip-count and are sent, and can be used as normal signal and use.

Described control method flow process is encapsulated among the FLASHROM of C8051F340 chip, is responsible for application configuration and state switching under cpu instruction.Behind the electrification reset, program begins to carry out from 0 address, carry out according to the process flow diagram order successively, after executing initialization and high definition configurator, program enters monitoring HOTSENSOR state, if HOTSENSOR is FALSE always, then program is waited for, otherwise program begins configuration data, and by DVI interface output TMDS digital signal.

Claims (2)

1, a kind of LVDS driver card based on multimedia integration projector, it is characterized in that, this LVDS driver card comprises LVDS receiver module, DVI driver module, CPU computing module, VGA driver module, described CPU computing module is connected with LVDS receiver module, DVI driver module by pin, and described LVDS receiver module is connected with the VGA driver module by pin; Described LVDS driver card one end is connected by the DVI interface of the digital video signal matrix commutation circuit on DVI interface and the projector mainboard, and the other end passes through the LVDS interface and is connected with built-in industrial micro computer mainboard.

2, a kind of control method of the LVDS driver card based on multimedia integration projector according to claim 1, its feature comprises the steps:

(1) electrifying startup, after the start, LVDS interface 23 from the micro computer mainboard, the 5V voltage that 24,25,26 pin provide is supplied with the LVDS driver card, LVDS driver card builtin voltage voltage stabilizer LDO, conversion 5V voltage also offers master cpu, and chip reset is started working, and 5V voltage offers conventional passage VGA pio chip ADV7120 voltage after by filtering circuit simultaneously;

(2) the beginning initialization operation begins to carry out the initialization operation program, the configuration effort dominant frequency behind the master cpu chip reset; Finish internal RAM space initialization operation, dispose each interface I/O running parameter;

(3) configuration display register parameter is passed through I ²The C data bus is provided with high definition display channel basic parameter;

(4) configuration pin state level forbids showing output, and the relevant I/O pin of master cpu chip configuration realizes and peripheral chip connects;

(5) configuration high definition passage shows and configuration standard passage video data startup VGA output, and data start VGA output; Master cpu passes through I after detecting the terminal access ²C DDC passage reads projector's display parameter, according to the DDC channel data, rationally adjusts high-definition image output clock frequency, synchronizing cycle and image quality resolution parameter;

(6) detect the HOTSENSOR state,, read projector's configuration, DDC channel data, display resolution is set if signal is arranged; If do not have signal then return and continue to detect HOTSENSOR;

(7) show that by DVI interface output high-resolution the TMDS signal is to projector.

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