CN109246401A - A kind of DLP laser projection system - Google Patents
A kind of DLP laser projection system Download PDFInfo
- Publication number
- CN109246401A CN109246401A CN201710293047.5A CN201710293047A CN109246401A CN 109246401 A CN109246401 A CN 109246401A CN 201710293047 A CN201710293047 A CN 201710293047A CN 109246401 A CN109246401 A CN 109246401A
- Authority
- CN
- China
- Prior art keywords
- signal
- interface
- laser projection
- projection system
- lvds
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/12—Picture reproducers
- H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
- H04N9/3138—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM] using arrays of modulated light sources
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/12—Picture reproducers
- H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
- H04N9/3141—Constructional details thereof
- H04N9/315—Modulator illumination systems
- H04N9/3161—Modulator illumination systems using laser light sources
Abstract
The invention discloses a kind of DLP laser projection systems, including central processing unit, interface unit, wherein central processing unit includes data processing decoded portion, audio processing part；Interface unit includes HDMI, the multi-path digitals input signal such as DVI interface interface, multiple-channel output interface；Data processing decoded portion is used to the signal decoding of input being converted to LVDS signal, and the signal of input is adjusted and is corrected, and is exported to LVDS interface；Digital tone source is decoded into analog signal and exported by audio processing part.Level of integrated system is high, few using chip.Greatly reduce the design difficulty of the peripheral circuits such as power supply, clock.Layout wiring is simpler and more direct, reduces signal interference, improves system signal integrality and image quality.PCB is small in size, at low cost, occupies structure space and reduces, meets the development trend of miniaturization and portable product.
Description
Technical field
The invention belongs to laser projection fields, and in particular to a kind of DLP laser projection system.
Background technique
Existing laser-projector scheme mainly has:
One, as shown in Figure 1, being made up of the scheme of signal processing system separate chip: VGA turns TTL chip (AFE1000)
+ HDMI turns TTL chip (IT6605).
1, mainly VGA turn TTL chip (AFE1000), and maximum resolution supporting rate is low, and are only done using a chip
This this feature capability is too simple, has little significance, and at high cost.
2, mainly HDMI turn TTL chip (IT6605), and only do this this feature capability using a chip
It is too simple, it has little significance, and occupancy PCB surface at high cost product is big.
3, it is also necessary to which individually plus a MCU does stand-by power consumption control function, and only does this function using a MCU chip
Can, it is functional too simple, it has little significance, and at high cost.
Disadvantage: function is simple, and needs specially to be programmed with a MCU chip to do low-power consumption function, number of chips
More PCB areas occupied are big, at high cost.
Two, as shown in Fig. 2, realizing signal processing and control system by a chip, it is further added by an individual chips reality
The 3D function of now projecting, circuit design is more complicated, and PCB LAYOUT area occupied is also bigger, and overall plan is needed using two
A chip realizes same function, and software development cycle is long, therefore cost is also high.
Summary of the invention
The technical problems to be solved by the present invention are: providing a kind of DLP laser projection system, solves and swash in the prior art
The problem that light projector control system number of chips is more, wiring is complicated, volume is big, interference is more.
The present invention uses following technical scheme to solve above-mentioned technical problem:
A kind of DLP laser projection system, including central processing unit, interface unit, wherein central processing unit includes number
According to processing decoded portion, audio processing part；Interface unit includes multi-path digital input signal interface, multiple-channel output interface；Number
It is used to the signal decoding of input being converted to LVDS signal according to processing decoded portion, the signal of input is adjusted and is corrected,
And it exports to LVDS interface；Digital tone source is decoded into analog signal and exported by audio processing part.
It further include signal conversion circuit, for LVDS signal to be converted to TTL signal.
There is light-coupled isolation element between multi-path digital input signal interface and data processing decoded portion.
It further include Power Management Unit, Power Management Unit has multiple DC-DC circuits, the output of each DC-DC circuit
Voltage is adjusted by the matching combination of at least two resistance.
The output voltage of multiple DC-DC circuits includes+3.3V ,+1.15V ,+1.8V.
Compared with prior art, the invention has the following advantages:
1, level of integrated system is high, few using chip.Greatly reduce the design difficulty of the peripheral circuits such as power supply, clock.
2, Layout wiring is simpler and more direct, reduces signal interference, improves system signal integrality and image quality.
3, at low cost, material requirement is less, to reduce materials procurement difficulty, reduces supply when product volume production
Risk.
4, PCB is small in size, occupies structure space and reduces, meets the development trend of miniaturization and portable product.
5, functional, the DLP laser projection system Integrated Solution of high efficiency, high reliability solve the small-sized picture of pcb board and set
Meter, software development cycle are also short, it is only necessary to which a chip can be achieved with so interface function.
Detailed description of the invention
Fig. 1 is laser projection principles of signal processing block diagram in the prior art.
Fig. 2 is the functional block diagram of the multiple chip controls of laser projection in the prior art.
Fig. 3 is present system composition function block diagram.
Fig. 4 is the functional block diagram of central processing unit of the present invention.
Fig. 5 is the functional block diagram that LVDS signal of the present invention is converted to TTL signal.
Fig. 6 is that+3.3V exports DC-DC circuit schematic diagram.
Fig. 7 is that+1.8V exports DC-DC circuit schematic diagram.
Fig. 8 is that+1.15V exports DC-DC circuit schematic diagram.
Fig. 9 is present system starting procedure figure.
Figure 10 is present system work flow diagram.
Figure 11 is present system shutdown process figure.
Figure 12 is present system abnormality processing flow chart.
Specific embodiment
Structure and the course of work of the invention are described further with reference to the accompanying drawing.
A kind of DLP laser projection system, including central processing unit, interface unit, wherein central processing unit includes number
According to processing decoded portion, audio processing part；Interface unit includes HDMI, the multi-path digitals input signal such as DVI interface interface, more
Road output interface；Data processing decoded portion is used to the signal of input decoding being converted to LVDS signal, to the signal of input into
Row adjusts and correction, and exports to LVDS interface；Digital tone source is decoded into analog signal and exported by audio processing part.
It further include signal conversion circuit, for LVDS signal to be converted to TTL signal.
There is light-coupled isolation element between multi-path digital input signal interface and data processing decoded portion.
It further include Power Management Unit, Power Management Unit has multiple DC-DC circuits, the output of each DC-DC circuit
Voltage is adjusted by the matching combination of at least two resistance.
The output voltage of multiple DC-DC circuits includes+3.3V ,+1.15V ,+1.8V.
It further include monitoring module, 3D control module, induction colour wheel control module, monitoring module includes fan monitoring, temperature
Monitoring；Incude colour wheel control module signal enabling or stopping induction colour wheel based on the received.
Specific embodiment,
As shown in figure 3, a kind of DLP laser projection system, including central processing unit, interface unit, wherein central processing
Unit includes data processing decoded portion, audio processing part；The LVDS signal of data processing decoded portion output passes through signal
Converting unit is converted to TTL signal, is then transmit to monitoring module, and monitoring module has colour wheel drive part, and fan temperature is pressed
Key monitor portion, and there are DMD data to show that between central processing unit and monitoring module, central processing unit is equal with external communication
It is connected by I2C bus；Interface unit includes multi-path digital input signal interface and multiple-channel output interface；Such as: HDMI, DVI,
USB interface, display port, video input/output port serial ports, SPDIF coaxial port, power supply indicator interface etc.；At audio
Digital tone source is decoded into analog signal by reason part, is carried out after power amplifier and by the output of the playback equipments such as loudspeaker.
The embodiment is using MST9U13Q1 chip as central processing unit, and specific functional modules are as shown in figure 4, include letter
Number input engine, variable connector converting unit, memory control unit, picture-in-picture display processing unit, correction unit, signal conversion
Unit, audio conversion unit, Power Management Unit, OSD menu, GPIO USB interface etc., variable connector converting unit is by signal
The signal of input engine input switches over management.
The signal conversion circuit of the embodiment, as processor, is used to turn LVDS signal using THC63LVD1024 chip
It is changed to TTL signal, concrete function block diagram is as shown in figure 5, include multi-channel control port, two-way LVDS input port and right with it
Two-way TTL output port, the synchronization signal interface answered, inside have serioparallel exchange and data processing unit, clock converting unit
The clock signal of 8~135MHz is converted to the clock output of 8~150MHz.
There is light-coupled isolation element between multi-path digital input signal interface and data processing decoded portion.
System further include monitoring module, 3D control module, induction colour wheel control module, monitoring module include fan monitoring,
Monitoring temperature；3D control module is used to open, closes 3D function；Induction colour wheel control module signal enabling or is stopped based on the received
Only incude colour wheel.Monitoring module, 3D control module, induction colour wheel control module processing result are output to the realization of DDP4422 chip
Function, specific output end function are defined as follows:
Temperature anomaly functions of indicator light 2: when environment temperature is more than 35 degree, corresponding GPIO 49 is supreme, and it is aobvious to close image
Show, corresponding TMP_LED (temperature anomaly indicator light) indicator light shows that orange sequence is " light-dark-light-dark ": indicating that fan is different
Often；
Fan exception functions of indicator light 2: when any one fan does not turn in system, corresponding GPIO 50 is supreme, closes figure
As display, corresponding FAN_LED (fan exception indicator light)) indicator light be displayed in blue sequence be " light-dark-light-dark ": indicate wind
Fan is abnormal；
3D function: control corresponding output port realization 3D function opens or closes control.
Incude 1 control function of colour wheel: after booting, when colour wheel 1 is rotated in 120HZ frequency, system could normally be shown；
Incude 2 control function of colour wheel；After booting, when colour wheel 2 is rotated in 120HZ frequency, system could normally be shown；
Backlight duty cycle adjustment: bright 100%, standard 80%, environmental protection 50%.
DDP4422 program is burned: only USB just can be burned, but also to enter boot loader mode, therefore, when
When system will do external burned program, additional miniUSB and KEY is needed (to add again machine casing can be by arriving
).
Power Management Unit has multiple DC-DC circuits, and each DC-DC circuit all has independent DC-DC chip, exports
Voltage is adjusted by the matching combination of at least two resistance.
The output voltage of multiple DC-DC circuits includes+3.3V ,+1.15V ,+1.8V.
Wherein, the power-switching circuit that output voltage is+3.3V is as shown in fig. 6, marked+5V using AP1084-ADJ chip
Quasi- voltage is converted to the voltage of+3.3V output, and it is 5A which, which exports electric current, and input terminal and output end are all made of capacitor electricity
Feel afterflow capacitor filtering, output voltage VoutIt is calculated using following formula:
Wherein, in the embodiment, Vref=1.25V, Iadj=55uA, Rn=300 Ω, Rm=180 Ω can be adjusted according to demand
Economize on electricity the Standard resistance range hindered.
Output voltage is the power-switching circuit of+1.8V as shown in fig. 7, being turned+5V normal voltage using SYS8088 chip
It is changed to the voltage of+1.8V output, it is 1A, input voltage range 2.5V~5.5V, feedback voltage V which, which exports electric current,FB
=0.6V, input terminal and output end are all made of inductance afterflow capacitor filtering, and high electricity is set by connecting after resistance with+5V in enable end
It is flat, output voltage VoutIt is calculated using following formula:
Wherein, in the embodiment, R1It is composed in series at least two resistance, in order to obtain the output voltage of full accuracy,
The Standard resistance range that resistance can be adjusted according to demand achievees the effect that precise fine-adjustment using different resistance, the R of the embodiment1It adopts
Use RM20And RM21Two resistance values be 100K, precision 1% resistance be composed in series.
Output voltage is the power-switching circuit of+1.15V as shown in figure 8, using AOZ1036 chip by+12V normal voltage
The voltage of+1.15V output is converted to, input terminal uses capacitor filtering, and output end is all made of inductance afterflow capacitor filtering, compares end
Resistance R is connected between COMP and groundcWith capacitor CcSeries circuit, feedback end FB respectively with capacitor Cf, resistance Ra, resistance RbEven
It connects, capacitor CfWith resistance RaIt is connect by 0 Europe resistance with output end after composition parallel circuit, output voltage VoutUsing following formula
It calculates:
Wherein, in the embodiment, Ra=2.15K Ω, precision 1%, RbIt is composed in series at least two resistance, in order to obtain
The output voltage of full accuracy is taken, the Standard resistance range of resistance can be adjusted according to demand, precise fine-adjustment is reached using different resistance
Effect, the R of the embodimentbUsing RM19And RM23Two resistance are connected, wherein RM19Resistance value be 4.3K, precision 1%,
RM23Resistance value be 240 Ω.
In the embodiment, different according to demand that different conversion chips may be selected, the output electric current of chip is different, selection rule
Then such as the following table 1:
Table 1
Different output voltages needs to select the R of different resistance valuesb, RbSelection and output voltage corresponding relationship such as table 2,
Table 1
| Rb | Vout(V) |
| 6.2K | 1.05 |
| 5.1K | 1.1 |
| 4.3K+240Ω | 1.15 |
| 3.9K | 1.2 |
The corresponding module workflow, software control of this system require and detailed process is as follows:
Control mode: I2C, write address OX34 read OX35, and Content of communciation is set according to specific requirements；
It projects related menu and adds content: projection pattern, display pattern, keystone, using the time, H/A mode,
Energy-saving mode, image scaling, 3D setting.
If necessary to realize long-range control, the network-control APP that we will do a PC version first installs software, passes through
APP tool sends instructions to system, is then converted into serial ports control DDP4422；
Power on/off: turning I2C by RJ45, first sends power-on instruction to MST9U13Q1, and MST9U13Q1 starts to work,
MST9U13Q1 produces I2C control DDP4422 booting simultaneously.
For starting procedure as shown in figure 9, accessing power supply first, 5V reference power supply work, system judges whether that receiving booting refers to
If enabling, receiving, into workflow, otherwise, into standby mode.
Working-flow is as shown in Figure 10, if in starting procedure, system enters workflow, starting DDP4422 is supplied
Circuit has detected whether that DLP gets out signal, if detecting that DLP gets out signal, exports picture signal, then executes
Refresh Data instruction, being recycled to broadcasting terminates；Otherwise, it continues waiting for DLP and gets out signal.
System closedown process is as shown in figure 11, and system is in normal operating conditions, has detected whether external shutdown command, such as
Fruit has, and issues shutdown command, and control DDP4422 power supply circuit is closed, and main system enters shutdown process, otherwise continues to system
Normal operating conditions waits shutdown command；
After main system enters shutdown process, detect whether that DLP closed state instructs, if so, DLP system is powered off,
Main system enters standby mode, otherwise, waits the instruction of DLP closed state.
System exception process flow is as shown in figure 12, and system handles normal operating conditions, has detected whether exceptional instructions letter
Number, which is provided by DDP4422, if so, screen prompt information is issued, after waiting the preset time,
Into shutdown process, otherwise, system worked well state is maintained.
The embodiment issues screen prompt letter, enters shutdown process after waiting 30 seconds, which can be according to different systems
Configuration or use environment sets itself.
Claims (5)
1. a kind of DLP laser projection system, it is characterised in that: including central processing unit, interface unit, wherein central processing
Unit includes data processing decoded portion, audio processing part；Interface unit includes that multi-path digital input signal interface, multichannel are defeated
Outgoing interface；Data processing decoded portion is used to the signal decoding of input being converted to LVDS signal, adjusts to the signal of input
Section and correction, and export to LVDS interface；Digital tone source is decoded into analog signal and exported by audio processing part.
2. DLP laser projection system according to claim 1, it is characterised in that: further include signal conversion circuit, being used for will
LVDS signal is converted to TTL signal.
3. DLP laser projection system according to claim 1, it is characterised in that: multi-path digital input signal interface and number
There is light-coupled isolation element according between processing decoded portion.
4. DLP laser projection system according to claim 1, it is characterised in that: further include Power Management Unit, power supply pipe
Managing unit has multiple DC-DC circuits, and the output voltage of each DC-DC circuit is combined by the matching of at least two resistance to carry out
It adjusts.
5. DLP laser projection system according to claim 3, it is characterised in that: the output voltage packet of multiple DC-DC circuits
Include+3.3V ,+1.15V ,+1.8V.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710293047.5A CN109246401A (en) | 2017-04-28 | 2017-04-28 | A kind of DLP laser projection system |
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| CN201710293047.5A CN109246401A (en) | 2017-04-28 | 2017-04-28 | A kind of DLP laser projection system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110049264A (en) * | 2019-03-28 | 2019-07-23 | 深圳创维－Rgb电子有限公司 | A kind of laser television electric power supply control system and method |
| CN112887687A (en) * | 2021-01-21 | 2021-06-01 | 青岛科技大学 | Double-circuit laser projection equipment |
| CN115150602A (en) * | 2022-08-31 | 2022-10-04 | 深圳市橙子数字科技有限公司 | High-fidelity DLP projector |
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| CN206712976U (en) * | 2017-04-28 | 2017-12-05 | 中航国画（上海）激光显示科技有限公司 | A kind of DLP laser projection systems |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110049264A (en) * | 2019-03-28 | 2019-07-23 | 深圳创维－Rgb电子有限公司 | A kind of laser television electric power supply control system and method |
| CN112887687A (en) * | 2021-01-21 | 2021-06-01 | 青岛科技大学 | Double-circuit laser projection equipment |
| CN115150602A (en) * | 2022-08-31 | 2022-10-04 | 深圳市橙子数字科技有限公司 | High-fidelity DLP projector |
| CN115150602B (en) * | 2022-08-31 | 2022-11-08 | 深圳市橙子数字科技有限公司 | High-fidelity DLP projector |
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