CN100462841C

CN100462841C - Color enlarger image forming apparatus

Info

Publication number: CN100462841C
Application number: CNB2006100234866A
Authority: CN
Inventors: 吴生; 孙健
Original assignee: DUOLI IMAGE DEVICE Co Ltd SHANGHAI
Current assignee: DUOLI IMAGE DEVICE Co Ltd SHANGHAI
Priority date: 2006-01-19
Filing date: 2006-01-19
Publication date: 2009-02-18
Anticipated expiration: 2026-01-19
Also published as: CN1845006A

Abstract

The invention relates to a new color printer imager. Wherein, the image information of computer display card, via DVI interface circuit, DVI receiving circuit, to be transmitted into image processing circuit; and via driving circuit to be transmitted to the LCD liquid crystal display; another single chip CPU receives image adjusting signal sent by the image adjuster, and via A/D conversion to be fed to the image processing circuit; another electric level convert circuit will convert the control signal levels of image processing circuit and the single chip (CPU) into the level displayed by LCD; the image adjuster is a direct-current level adjuster in said circuit, which comprises brightness, contrast, channel 1 and channel 2 potentiometers, reference potentiometer, parity potentiometer, flash potentiometer and ghost potentiometer; the software in the single chip CPU inputs the adjust parameter of image adjuster into the image processing circuit to adjust.

Description

Color enlarger image forming apparatus

Technical field

The present invention relates to a kind of color enlarger image forming apparatus, relate to quality treatment technology digital picture and video image.

Background technology

Existing like product, general 12 modes of simulation that adopt are exported.During liquid crystal display, need regulate brightness, contrast, perpendicular road, assorted point, ghost image equipotential device.In use for some time, the potentiometer decay can produce serious adverse consequences to liquid crystal display, even can not normally show.

Summary of the invention

Adjust the problem of depositing in the picture quality process for improving aforementioned colour enlarger, the invention provides a kind of color enlarger image forming apparatus, comprise a DVI interface circuit, a DVI receiving circuit, an image processing circuit, one drive circuit, a LCD, an image adjusting device, a single-chip microcomputer and a level shifting circuit, wherein: the image information of computer video card, successively through described DVI interface circuit and described DVI receiving circuit, deliver to described image processing circuit, deliver to described LCD through described driving circuit again; Described single-chip microcomputer is accepted the image adjustment signal that described image adjusting device is sent here, delivers to described image processing circuit after the A/D conversion; Described level shifting circuit converts the control signal associated level of described image processing circuit and the output of described single-chip microcomputer to level that described liquid crystal display displays requires; Described image adjusting device is the DC level regulator that is provided with in the circuit, comprises luminance potentiometer, contrast potentiometer, the first perpendicular road potentiometer, the second perpendicular road potentiometer, reference potential device, odd even potentiometer, flicker potentiometer and ghost potentiometer.

Adjustment parameter in the image adjusting device is input in the image processing circuit, is to be finished by the software in the singlechip CPU, and the software work step that is provided with in the singlechip CPU is:

(1) one-chip machine port initialization;

Does (2) DVI receive signal?

(3) if receive signal, read the magnitude of voltage of luminance potentiometer, contrast potentiometer and perpendicular road potentiometer;

(4) video signal preprocessor initialization of register;

(5) by three-way serial port the video signal preprocessor relevant register is set;

(6) power-up initializing=1?

(7) if not, the magnitude of voltage of the machine-readable luminance potentiometer of monolithic, contrast potentiometer and perpendicular road potentiometer;

(8) if postpone 100ms;

(9) brightness register and the contrast register of video signal preprocessor are set by three-way serial port;

(10) the perpendicular road register of video signal preprocessor is set by three-way serial port;

(11) preserve parameter effectively and adjust brightness, contrast or perpendicular road and effectively deny?

(12) if effectively, then light the DVI pilot lamp, the value in brightness, contrast and perpendicular road is write the FLASH register, extinguish the DVI pilot lamp;

Are (13) adjustment luminance switch, contrast switch effectively denied?

(14) if effectively, then the brightness and contrast's value that reads is write in the register of video signal preprocessor;

(15) adjust perpendicular road switch and effectively deny?

(16) if effectively, then read the value in perpendicular road, time-delay 300ms writes in the register of video letter processor;

(17) relay indicating light sign=1?

(18) if then light relay indicating light;

(19) if not, then extinguish relay indicating light;

(20) single-chip microcomputer enters idle condition, is back to (11).

Single-chip microcomputer also has by the parameter that three-way serial port is loaded in the video image processor: data are adjusted in image scanning parameter, resolution control data, color balancing data, Gamma data, ghost data and picture centre position.

Wherein the method for adjustment of color balancing is:

A) mode register C85H is set;

B) the b0 position of register C80h is made as " 0 ";

C) more than 1 VSYNC input signal?

D) if then the b0 position of register C80h is made as " 1 ";

E) more than 1 VSYNC input signal?

F) if the corrected parameter of then writing red R, yellow G, green B is to the RAM-DI register;

G) revised all data?

H) if then finish, otherwise continue to write.

Advantage of the present invention is,

1, easy to operate;

2, realized adjustment to brightness, contrast, ghost, perpendicular road;

3, use the DVI interface, the picture quality that offers the best has reduced signal in transmission

Loss in the process;

4, the monoblock drive plate does not have any injury all by low voltage power supply to human body.

The present invention is whole digital signal processing, in use be not related with potentiometer, data such as brightness, contrast all leave in the processor, can open toggle switch before using makes drive plate enter the potentiometer adjustment state, regulate by potentiometer this moment, liquid crystal display adjusted to the optimum condition of demonstration, again by closing toggle switch, the magnitude of voltage of potentiometer is converted to real operable supplemental characteristic, leaves in the register.In use stable relatively good.

Description of drawings

Accompanying drawing 1 is a block scheme of the present invention.

Accompanying drawing 2 is process flow diagrams that singlechip CPU is adjusted image parameter.

Accompanying drawing 3 is color balancing method of adjustment process flow diagrams.

Accompanying drawing 4 is three-way serial data transmission mode waveforms.

Embodiment

See also shown in the accompanying drawing 1, the image information 1 of computer video card through connecing DVI interface circuit 2, DVI receiving circuit 3, is delivered to image processing circuit 4, delivers to LCD LCD 6 through driving circuit 5; Another single chip CPU 8 is accepted the image adjustment signal that image adjusting device 7 is sent here, delivers to image processing circuit 4 after the A/D conversion; Another level shifting circuit 9 converts image processing circuit 4 and singlechip CPU 8 control signal level the level of LCD display requirement to.

The picture signal that video card produces sends to the DVI receiver through the TMDS passage of DVI interface, the DVI receptacle is by string-also conversion, form each pixel 10 position digital signal, and and clock signal, row, field synchronization control signal are passed to image processor together, image processor is given level shifting circuit in conjunction with the control information that single-chip microcomputer sends with control signal.And vision signal will be fed to 4 vision signal chip for driving.The control signal that 24 road voltage signals that the vision signal chip for driving produces are sent together with level shifting circuit is given LCD display.

DVI (digital video) interface circuit can link to each other with video card by cable, is used for receiving data and the clock that video card sends.Send the DVI receiver in TMDS (digital video balanced device) mode.This process does not relate to the AD conversion, can not cause the loss of signal, compares with the VGA signal, can obtain higher picture quality.

DVI receiving circuit 2 uses the SIL1161CTU chip decoding of Silicon Image, the highest support of this chip UXGA (1600 horizontal pixels and 1200 vertical pixels---1600*1200) resolution, 24/pixel, 16.7M true color, QFP100 pin encapsulation architecture.

This receiving circuit is supported the cable that 10m is long, compatible DVI1.0 agreement under UXGA speed.Finish the serial data that receives is formed 10 position digital signals according to the form of 2 of every pixels (high 2) R, 4 (high 4) G, 4 (high 4) B, export clock simultaneously, control signals such as row, field synchronization.The data of 2 pixels of each clock output are given image processor.Row, field sync signal are used for controlling the scanning starting position of LCD.

Image processing circuit 4 adopts chip L3E07050K0B, and 3.3V power supply and 2.5V dual power supply are supported; The maximum clock frequency of operation is 85MHZ, and R, G, B passage can exchange tonal range 10bit.Image processor is handled by two passages of R, G, and the picture element signal of receiving is exported corresponding sampling simultaneously and kept clock, the beginning commutation pulse, and control signals such as beginning data input are given the vision signal chip for driving.And, finish image brightness according to the data that receive from single-chip microcomputer, and contrast, Gamma proofreaies and correct, and color is evenly proofreaied and correct and picture quality improves.It is gone back the generation time control signal and exports to level transferring chip, is used for the demonstration of drive TFT liquid crystal display.

Driving circuit 5 adopts chip L3E0607D0A, and the 3.3V logical circuit power supports that 15V simulating signal power supply is supported; Provide 10 quick DA conversions, the maximum 85MHZ of frequency of operation.The output of 6 tunnels analogy voltages, voltage output range is wide: 1.5V-13.5V can directly drive the LCD screen.L3P13Y-25G01 has the input of 24 tunnels analogies, therefore uses 4 chip for driving respectively.The picture element signal that chip for driving receiving video signals processor is sent here, and control signal.Sequential according to control signal requires to finish DA conversion and level output.

Level shifting circuit 9 adopts chip L3E01031F0A, and the 3.3V digital power supports that 15V simulating signal power supply supports that the maximum 4.2MHZ of inversion frequency finishes the control signal of video signal preprocessor and single-chip microcomputer output is carried out voltage or level conversion.Convert low voltage signal to high voltage signal or high and low level conversion is used for driving liquid crystal display.This chip can carry out delay compensation at the phase error that scan control signal produces in transmission course; Therefore guarantee control signal most possibly according to the designing requirement co-ordination, thereby make demonstration more stable.

Single-chip microcomputer 8 (CPU) adopts chip C8051F022, and the 3.3V single supply is supported, the 64KFLASH program space; And the 3.3V characteristic of CPU itself itself also provides convenient in order to simplify the power supply design; This CPU carries 10bit A/D conversion, carries 2.4V Ref, makes periphery design quite convenient, therefore provides convenience for saving the plate space of planes; Support ISP (system programmable).

The magnitude of voltage in the brightness that single-chip microcomputer 8 is used for collecting, contrast, perpendicular road etc. generates the data in control brightness, contrast, perpendicular road etc. by the AD conversion.Write in the corresponding registers of video signal preprocessor.It goes back the data input time of control of video conversion of signals chip and the conversion sequence of chip internal passage.Single-chip microcomputer is also exported the Y direction control signal, by the Y-axis direction of scanning of control LCD after the level conversion.

Drive plate will with the serial EEPROM of information stores to 1 1K of video card communication in.

Image adjusting device is equipped with brightness, contrast, perpendicular road 1 on drive plate, perpendicular road 2 potentiometers link to each other with the AD input pin of single-chip microcomputer, during regulator potentiometer, magnitude of voltage is converted to digital quantity by the AD converting unit of single-chip microcomputer, write in the corresponding registers of image processor, change the image quality of presentation manager output, thereby play the purpose of regulating the LCD image.

The reference potential device links to each other with the pin of video drive chip, is used for being provided with the voltage range of DA conversion output.

The odd even potentiometer links to each other by the pin of voltage follower with the video drive chip, is used for setting the voltage of DA switching center vision signal, voltage range: 6V-12V.

The flicker potentiometer directly links to each other with the pin of L3P13Y-25G01, is used for adjusting the reverse voltage of LCD, voltage range: 5.4V-6.6V.

The ghost potentiometer links to each other with level transferring chip and controls the auxiliary signal of LCD.

Also design the serial communication function for the ease of debugging and function expansion, can adjust brightness, contrast, center by the serial ports host computer.Also can check program version number, the serial communication chip is selected MAX232 for use.

External power is supported: 20V, 5V, and adopt the external switch power supply independently-powered, characteristics are output voltage stability height, ripple is little, has overvoltage, overcurrent protection function.5V power is greater than 5W, and 20V power is greater than 20W, and the power supply general power is at 25W-30W, and outer casing of power supply must be connected with the earth.

Power distribution on the drive plate: behind the 20V power supply process 15V voltage stabilizing chip, provide the high voltage port of 15V power supply, adopt the LC filtering circuit on the plate, prevent that power frequency and other harmonic waves are by the power supply jamming pattern to chip for driving, level transferring chip and LCD screen.

Through the LC filtering circuit, provide the 3.3V operating voltage behind the 5V power supply process 3.3V power supply chip to DVI receptacle, presentation manager, vision signal chip for driving, level transferring chip logic power port and CPU.All chips insert the polarity free capacitor of 0.1 microfarad at the power port place, be used for absorbing the spike disturbing pulse.

Behind the 5V power supply process 2.5V voltage stabilizing chip,, offer the power supply of presentation manager through the LC filtering circuit.

Software design:

Behind the chip power, program is at first set up the duty of single-chip microcomputer (CPU), and the mode of operation of initialization port, the mode of operation of initialization ADC, and the initialization clock is the internal clocking pattern then, and used buffer zone in the program is emptied; After initialization finished, program began to load normal data, the configuration standard signal processing parameter; If how the user adjusts program, then load the user and adjust data, the change image display status.

Program at first detects the SCDT level of DVI receptacle, if the SCDT signal is a low level, program is waited for always, the SCDT signal is a high level, illustrates to receive signal, and program enters major cycle, the state of the detection toggle switch that beginning does not stop, if the toggle switch state changes, illustrated that the user adjusts program, program writes the data that receive in image processor or the FLASH register of self.

In order to guarantee the adjusted stability of data,, be used for switching the user's adjustment modes and the mode of operation in brightness, contrast, perpendicular road etc. in the time of software design by the toggle switch of a 8bit.When switch pushes the ON pattern is user's adjustment modes, otherwise the OFF pattern is a mode of operation.When any one function in adjustment modes the time, the relay indicating light on the plate will glimmer.Must switch to ON to switch after adjusting, otherwise image may be subjected to the influence that the fluctuation of the fluctuation of real-time voltage or device parameters brings.

One-chip machine port initialization and function:

1, P0.0 and P0.1 are configured to serial ports (URAT0) pattern, and by serial ports, host computer can be adjusted brightness, contrast, center.Also can check program version number.P0.2, P0.3, P0.4, P0.5 are respectively three-way serial port SDATA (serial data), SCLK (serial clock), SCS (serial chip selection), RESET (system reset).

2, the P1 mouth is configured to digital input pattern, gathers 8 toggle switch states by the P1 mouth.Carry out respective operations according to the toggle switch state then.Wherein the P1.0 position writes single-chip microcomputer FLASH model selection, and P1.1 is contrast and brightness adjustment modes, and P1.2 is perpendicular road adjustment modes, and P1.3 is a chip for driving passage conversion sequence control model, and P1.4 is the power-up initializing model selection.

3, the P4 mouth is configured to digital input pattern, P4.4 control single chip computer relay indicating light wherein, P4.3 control DVI communication pilot lamp.

About the analog to digital conversion initialization:

1:ADCO is initialized as interrupt mode, and software interruption after certain passage converts reads the conversion value of this passage and is saved in the A/D metadata cache, switches to next group ALT-CH alternate channel then.ADCO is totally eight ALT-CH alternate channels, only uses 5 here, and the corresponding brightness simulation is adjusted respectively, and the contrast simulation is neat, perpendicular road 1, and the ghost image adjustment is adjusted in 2 simulations of perpendicular road.Simulation adjustment has precedence over the adjustment data of UARTO, that is to say, when simulation adjustment switch switched to adjustment modes, the data that simulation is adjusted can cover the data of adjusting based on UARTO, and design is in order to guarantee the integrality of data like this.

The control of picture processing chip L3E07050K0B:

1, after the one-chip machine port initialization is finished, calls video signal preprocessor, its register is carried out initialization.

2, by 3-line serial interface load single-chip microcomputer by the AD conversion to data or brightness, contrast, perpendicular road, the ghost image user who is stored among the FLASH ROM adjust data; Data are adjusted in load image sweep parameter, resolution control data, color balancing data, Gamma data, ghost data, picture centre position makes figure enter normal condition.

3, data of the same type are written into being provided with in the register of single address.

Claims

1. color enlarger image forming apparatus, comprise a DVI interface circuit, a DVI receiving circuit, an image processing circuit, one drive circuit, a LCD, an image adjusting device, a single-chip microcomputer and a level shifting circuit, wherein: the image information of computer video card, successively through described DVI interface circuit and described DVI receiving circuit, deliver to described image processing circuit, deliver to described LCD through described driving circuit again; Described single-chip microcomputer is accepted the image adjustment signal that described image adjusting device is sent here, delivers to described image processing circuit after the A/D conversion; Described level shifting circuit converts the control signal associated level of described image processing circuit and the output of described single-chip microcomputer to level that described liquid crystal display displays requires; Described image adjusting device is the DC level regulator that is provided with in the circuit, comprises luminance potentiometer, contrast potentiometer, the first perpendicular road potentiometer, the second perpendicular road potentiometer, reference potential device, odd even potentiometer, flicker potentiometer and ghost potentiometer.