CN110267023A - A kind of Laser Driven protective device and method that projector uses - Google Patents
A kind of Laser Driven protective device and method that projector uses Download PDFInfo
- Publication number
- CN110267023A CN110267023A CN201910671570.6A CN201910671570A CN110267023A CN 110267023 A CN110267023 A CN 110267023A CN 201910671570 A CN201910671570 A CN 201910671570A CN 110267023 A CN110267023 A CN 110267023A
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- China
- Prior art keywords
- laser
- control unit
- unit
- light source
- drive unit
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- 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
-
- 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]
- H04N9/3191—Testing thereof
Abstract
The invention discloses a kind of Laser Driven protective devices that projector uses; it include: laser drive unit, memory cell, timer, detection unit, protection control unit, system control unit, Laser Driven protection location; protection control unit is electrically connected with memory cell, timer, detection unit, system control unit, Laser Driven protection location respectively; memory cell is electrically connected with system control unit, and laser drive unit is electrically connected with detection unit, Laser Driven protection location respectively.Laser Driven protective device of the invention can realize the state of monitoring laser light source driving, close laser light source driving in time when laser light source drives and occurs abnormal, avoid driving due to laser light source abnormal and projector being caused to cross cause thermal damage.
Description
Technical field
The present invention relates to the Laser Drivens of laser projection to detect protection technique field, in particular to a kind of projector uses
Laser Driven protective device and method.
Background technique
With the development of laser light source technology and shadow casting technique.The brightness that laser light source can provide is higher and higher, driving electricity
Road size is smaller and smaller, and power is also higher and higher.Application of the laser light source in projector graduallys mature.More and more projections
Machine uses laser light source.Currently, using red (R), the technology of green (G), blue (B) laser light source, timesharing realization colour are
The mainstream of laser light source projection.This technology is that the color seen in very short time using people can mix to realize coloured silk
Color imaging.In this way in projector system, laser light source of the driving of the laser light source of three kinds of colors from some color is driven
From the point of view of be a PWM wave.It is realizing in colored a cycle, red, green, blue laser is lighted respectively.
In projector system, heat dissipation is designed the case where being lighted according to laser of Laser Driven when working properly.If
The driving of laser light source occurs abnormal, it is likely that red, green occurs, blue laser lamp, two or three are lighted simultaneously
Situation.This abnormal appearance, laser light source can generate the heat more much bigger than normal condition.It may burn in a short time
Laser light source is ruined, projector is damaged.In order to avoid this kind of situation.We just need that one kind is added in projector can
The case where system for detecting laser light source driving condition, closes Laser Driven in time when noting abnormalities, avoid overheat appearance, protection
Projector.
Summary of the invention
It is insufficient in above-mentioned background technique the purpose of the present invention is overcoming, a kind of Laser Driven that projector uses protection is provided
Device and method closes laser when laser light source drives and occurs abnormal, it can be achieved that the state that monitoring laser light source drives in time
Light source driving avoids driving due to laser light source abnormal and projector being caused to cross cause thermal damage.
In order to reach above-mentioned technical effect, the present invention takes following technical scheme:
A kind of Laser Driven protective device that projector uses, comprising: laser drive unit, memory cell, timer, inspection
Unit, protection control unit, system control unit, Laser Driven protection location are surveyed, the laser drive unit is used for laser
Light source provides driving, and laser light source is made to work by the mode of design, and timer is used to provide clock interrupt to protection control unit,
Detection unit is used to sample from laser drive unit and to protection control unit feedback sample data, and memory cell is for saving
Feedback characteristic and sampling data detection when laser drive unit works normally, protection control unit according to timer for providing
Interruption, check the sampled data of detection unit feedback, and by by obtained feedback data and storing just in memory cell
Feedback characteristic when often compares, and judges whether laser drive unit is normal and feeds back judging result to system control unit,
And laser drive unit is controlled by Laser Driven protection location according to judging result, Laser Driven protection location is used for
Laser drive unit is controlled, system control unit is used for feedback characteristic deposit when laser drive unit is worked normally
Memory cell, and after being connected to the abnormal feedback of protection control unit, the type of abnormal conditions is stored in memory cell and is carried out
It is cumulative；The Laser Driven protective device that projector of the invention uses first passes through detection unit to Laser Driven list when in use
The road Yuan Zhongge light source state is detected, and protects control unit according to the Interruption frequency defaulted in timer, Mei Geyi
The statistical number for each road light source fixed time and the collected data of detection unit are counted, and a detection cycle is obtained
It is compared according to normal data corresponding with memory cell Nei Gai road light source is pre-stored in, therefore, it is determined that present laser driving unit
It is whether working properly, pass through Laser Driven protection location again when determining exception and control is carried out to laser drive unit and will be had
The judgement result and data feedback of body carry out further data processing and control by system control unit to system control unit
System, to provide the reference of maintenance laser drive unit for maintenance personal.
It further, further include abnormal indicating unit, the exception indicating unit is electrically connected with system control unit, abnormal
Indicating unit is used to carry out abnormal instruction according to the control of system control unit, reminds custom system appearance abnormal to realize.
Further, the abnormal indicating unit is acousto-optic exception instruction device, such as buzzer siren or combined aural and visual alarm
Deng.
Meanwhile the invention also discloses a kind of Laser Driven guard method that projector uses, made by above-mentioned projector
The realization of Laser Driven protective device, specifically includes the following steps:
A. driving is provided to laser light source by laser drive unit, the drive cycle of laser light source is T1, laser light source
The time that state is out in a drive cycle of tri- road light source of R, G, B is respectively Tr, Tg, Tb, and Tr+Tg+Tb=T1,
In, in a drive cycle, R, G, tri- road light source of B are opened in order, and only light source state is to open all the way in the same time；
B. it is detected by switch state of the detection unit to each road light source of laser drive unit, and will test result
Feed back to protection control unit；
C. protection control unit is in the case where the interruption frequency for the n/T1 that timer provides acts on, at interval of T1/n seconds time,
Receive one-time detection unit feedback detection data, and using certain all the way light source state by close conversion to when opening as detection cycle
Timing starts, and constitutes a detection cycle by n times detection, in each detection cycle, light source state is all the way if receiving certain
It opens, the number Cx (x r, g, b) of the road Ze Duigai light source opened carries out count value and one, n is added to be positive integer；
D. after each detection cycle, protection control unit will the road period Nei Ge light source the number Cx opened with
The road light source defaults in the standard number value Cx ' (x r, g, b) opened in memory cell detection cycle and is compared；
If E. | Cx-Cx ' | < m determines laser drive unit normal operation, otherwise, it is determined that laser drive unit operation is wrong
F is missed and enters step, m is positive integer；
F. protection control unit control Laser Driven protection location cuts off laser drive unit.
Further, the step F further include: protection control unit is to system control unit report exceptions, by being
System control unit will test data and be stored in memory cell.
Further, the Laser Driven protective device that the projector uses further includes abnormal indicating unit, the projection
The Laser Driven guard method that machine uses further includes step G: system control unit controls abnormal indicating unit and carries out abnormal instruction.
Further, the step E specifically: if | Cx-Cx ' | < m determines laser drive unit normal operation, no
Then, determine laser drive unit run-time error, if continuous y detection cycle determines laser drive unit run-time error, into
Enter step F, y is positive integer.
Further, the value that the value of y is 3, m is 3.
Further, the Cx '=Tx/ (T1/n), wherein x r, g, b.
Compared with prior art, the present invention have it is below the utility model has the advantages that
The Laser Driven protective device and method that projector of the invention uses are protection control unit using detection unit
The case where feedback laser driving unit, makes laser drive unit work by comparing the sampling of feedback for protection control unit
Make situation whether Yi Chang judgement, if Laser Driven work occurs abnormal, protection control unit can not only turn off laser in real time
Driving unit is to protect laser light source, moreover it is possible to which which road laser light source exception judgement is specifically and is stored in memory cell, for maintenance
Personnel's maintenance failure provides reference, facilitates maintenance, and remind user by indicator light, system breaks down, to arrange in time
Except exception, it can be achieved that the protection of laser light source projection, avoids burning laser light source extremely due to Laser Driven.
Detailed description of the invention
Fig. 1 is the schematic diagram for the Laser Driven protective device that projector of the invention uses.
Fig. 2 is the schematic diagram of laser drive waveform in one embodiment of the present of invention.
Specific embodiment
Below with reference to the embodiment of the present invention, the invention will be further elaborated.
Embodiment:
Embodiment one:
As shown in Figure 1, a kind of Laser Driven protective device that projector uses, comprising: laser drive unit, storage are single
Member, timer, detection unit, protection control unit, system control unit, Laser Driven protection location, protection control unit point
Be not electrically connected with memory cell, timer, detection unit, system control unit, Laser Driven protection location, memory cell be
Control unit of uniting electrical connection, laser drive unit are electrically connected with detection unit, Laser Driven protection location respectively.
Specifically, laser drive unit is used to provide driving to laser light source, laser light source is made to work by the mode of design；
Timer is used to provide clock interrupt to protection control unit, to guarantee to protect the timely processing detection unit of control unit to sharp
The sampling of optical drive is fed back；Detection unit be used for from laser drive unit sampling and to protection control unit feedback sample number
According to；Memory cell is used to save the feedback characteristic and sampling data detection when laser drive unit works normally, sampling Detection number
There is abnormal number and type according to specifically including；The interruption that protection control unit is used to provide according to timer, is being determined
When device interruption when, check the sampled data of detection unit feedback, and by depositing obtained feedback data and in memory cell
Put it is normal when feedback characteristic compare, judge whether laser drive unit normal and feed back to system control unit to judge
As a result, and being controlled by Laser Driven protection location laser drive unit according to judging result.
Laser Driven protection location is used to control laser drive unit according to the control of protection control unit, system
Control unit is used in system initialization, and feedback characteristic when laser drive unit is worked normally is stored in memory cell, and
After being connected to the abnormal feedback of protection control unit, the type of abnormal conditions is stored in memory cell and is added up, for maintenance
Personnel provide the reference to maintain machinery.
The Laser Driven protective device that projector of the invention uses first passes through detection unit and drives to laser when in use
The road moving cell Zhong Ge light source state is detected, and protects control unit according to the Interruption frequency defaulted in timer, often
Every the system that certain time is each road light source for counting to the collected data of detection unit, and a detection cycle being obtained
It counts normal data corresponding with memory cell Nei Gai road light source is pre-stored in be compared, therefore, it is determined that present laser drives
Whether unit is working properly, passes through Laser Driven protection location again when determining exception and is controlled simultaneously laser drive unit
To specifically determine result and data feedback to system control unit, by system control unit carry out further data processing and
Control, to provide the reference of maintenance laser drive unit for maintenance personal.
As preferential, in the present embodiment, the Laser Driven protective device that projector uses further includes abnormal indicating unit, institute
It states abnormal indicating unit to be electrically connected with system control unit, abnormal indicating unit is used to be carried out according to the control of system control unit
Abnormal instruction reminds custom system exception occur to realize.
Specifically, the abnormal indicating unit of the present embodiment is realized by abnormal indicator light, other acousto-optics also can be selected in practice
Abnormal instruction device, such as buzzer siren or combined aural and visual alarm.
Embodiment two
A kind of Laser Driven guard method that projector uses, the Laser Driven protective device used by above-mentioned projector
It realizes, specifically includes the following steps:
Step 1: providing driving to laser light source by laser drive unit, as shown in Fig. 2, laser light source offer swashs
The drive cycle of optical drive waveform be T1, the state in a drive cycle of tri- road light source of laser light source R, G, B be out when
Between be respectively Tr, Tg, Tb, and Tr+Tg+Tb=T1, wherein T1, R, G in a drive cycle, tri- road light source of B are beaten in order
It opens, and only light source state is to open all the way in the same time.
In the present embodiment, if a drive cycle time is 60s, R, G, tri- road light source of B shape in a drive cycle
The time that state is out is respectively 20s.
Step 2: being detected by switch state of the detection unit to each road light source of laser drive unit, and will inspection
It surveys result and feeds back to protection control unit.
Step 3: protection control unit was under the interruption frequency effect for the n/T1 that timer provides, at interval of T1/n seconds
Time, receive one-time detection unit feedback detection data, and using certain all the way light source state by close conversion to when opening as detect
The timing in period starts, and a detection cycle is constituted by n times detection, in each detection cycle, if receiving certain light source all the way
State is to open, and the number Cx (x r, g, b) of the road Ze Duigai light source opened carries out count value and one, n is added to be positive integer.
In the present embodiment, if the interruption frequency 1 that timer provides, i.e., received at interval of 1s guardtime control unit
The detection data of one-time detection unit feedback, and 60 detections constitute a detection cycle.By taking the road R as an example, in the present embodiment,
Detect that the number that R is out is 22 times in one detection cycle.
Step 4: after each detection cycle, protection control unit will the road period Nei Ge light source open time
The road ShuoCxYu Gai light source defaults in the standard number value Cx ' (x r, g, b) opened in memory cell detection cycle and carries out
Compare, wherein Cx '=Tx/ (T1/n).
As in the present embodiment, by taking the road R as an example, then in a detection cycle, in the case where normal driving, should detect
It is to open number Cr '=20/1=20 times to R line state.
Step 5: if | Cx-Cx ' | < m determines laser drive unit normal operation, otherwise, it is determined that laser drive unit
Run-time error simultaneously enters step 6, and m is positive integer, meanwhile, after a detection cycle, if it is determined that normally, i.e., to Cr,
Cg, Cb count the beginning for resetting and preparing next cycle detection.
Ideally Cr=Cr ', Cg=Cg ', Cb=Cb ', under normal circumstances, erroneous judgement once in a while, sentences in order to prevent
Disconnected logic can be to be less stringent, in the present embodiment, and m value is 3, i.e. the worst error that sets of the present embodiment is 2 time.
Step 6: protection control unit is to system control unit report exceptions, specially by abnormal Cr, Cg, Cb
Value and there is abnormal message and be transmitted to system control unit, data will test by system control unit and be stored in memory cell
It is interior, meanwhile, if continuous 3 detection cycles determine laser drive unit run-time error, protection control unit controls Laser Driven
Protection location cuts off laser drive unit.
Specifically, as long as protection control unit controls Laser Driven and protects when can also set appearance judgement exception in practice
It protects unit and cuts off laser drive unit, or adjust the fault-tolerant number of error according to the actual situation, such as continuous 2 detection cycles are equal
When determining laser drive unit run-time error, protection control unit control Laser Driven protection location cuts off laser drive unit.
Step 7: system control unit controls abnormal indicating unit and carries out abnormal instruction, to remind maintenance personal as early as possible
It is checked to abnormal.
It is understood that the principle that embodiment of above is intended to be merely illustrative of the present and the exemplary implementation that uses
Mode, however the present invention is not limited thereto.For those skilled in the art, essence of the invention is not being departed from
In the case where mind and essence, various changes and modifications can be made therein, these variations and modifications are also considered as protection scope of the present invention.
Claims (9)
1. a kind of Laser Driven protective device that projector uses characterized by comprising
Laser drive unit, memory cell, timer, detection unit, protection control unit, system control unit, Laser Driven
Protection location, the laser drive unit are used to provide driving to laser light source, and laser light source is made to work by the mode of design, fixed
When device be used for protection control unit provide clock interrupt, detection unit be used for from laser drive unit sampling and to protection control
Unit feedback sample data processed, memory cell are used to save feedback characteristic and sampling Detection when laser drive unit works normally
Data, protection control unit are used for the interruption that provides according to timer, check the sampled data that detection unit is fed back, and pass through by
Stored in obtained feedback data and memory cell it is normal when feedback characteristic compare, whether judge laser drive unit
Judging result normally and to system control unit is fed back, and Laser Driven protection location is passed through to Laser Driven according to judging result
Unit is controlled, and for controlling laser drive unit, system control unit is used for sharp Laser Driven protection location
Feedback characteristic when optical drive unit works normally is stored in memory cell, and after being connected to the abnormal feedback of protection control unit,
The type of abnormal conditions is stored in memory cell and is added up.
2. the Laser Driven protective device that a kind of projector according to claim 1 uses, which is characterized in that further include different
Normal indicating unit, the exception indicating unit are electrically connected with system control unit, and abnormal indicating unit according to system for controlling
The control of unit carries out abnormal instruction.
3. the Laser Driven protective device that a kind of projector according to claim 2 uses, which is characterized in that the exception
Indicating unit is acousto-optic exception instruction device.
4. a kind of Laser Driven guard method that projector uses, which is characterized in that used by projector described in claim 1
Laser Driven protective device realize, specifically includes the following steps:
A. driving is provided to laser light source by laser drive unit, the drive cycle of laser light source is T1, laser light source R, G, B
The time that state is out in a drive cycle of three road light sources is respectively Tr, Tg, Tb, and Tr+Tg+Tb=T1, wherein
In one drive cycle, R, G, tri- road light source of B are opened in order, and only light source state is to open all the way in the same time；
B. it is detected by switch state of the detection unit to each road light source of laser drive unit, and will test result feedback
To protection control unit；
C. protection control unit, at interval of T1/n seconds time, receives under the interruption frequency effect for the n/T1 that timer provides
The detection data of one-time detection unit feedback, and using certain all the way light source state by closing conversion to timing when opening as detection cycle
Start, a detection cycle is constituted by n times detection, in each detection cycle, if receiving certain, light source state is to open all the way,
Carrying out count value to the number Cx (x r, g, b) of the road light source opened adds one, n to be positive integer；
D. after each detection cycle, protection control unit will the road period Nei Ge light source the number Cx opened and the road
Light source defaults in the standard number value Cx ' (x r, g, b) opened in memory cell detection cycle and is compared；
If E. | Cx-Cx ' | < m determines laser drive unit normal operation, otherwise, it is determined that laser drive unit run-time error is simultaneously
F is entered step, m is positive integer；
F. protection control unit control Laser Driven protection location cuts off laser drive unit.
5. the Laser Driven guard method that a kind of projector according to claim 4 uses, which is characterized in that the step
F further include: protection control unit will test data by system control unit and be stored in system control unit report exceptions
In memory cell.
6. the Laser Driven guard method that a kind of projector according to claim 5 uses, which is characterized in that the projection
The Laser Driven protective device that machine uses further includes abnormal indicating unit, and the Laser Driven guard method that the projector uses is also
Including step G: system control unit controls abnormal indicating unit and carries out abnormal instruction.
7. the Laser Driven guard method that a kind of projector according to claim 4 uses, which is characterized in that the step
E specifically: if | Cx-Cx ' | < m determines laser drive unit normal operation, otherwise, it is determined that laser drive unit operation is wrong
Accidentally, if continuous y detection cycle determines laser drive unit run-time error, F is entered step, y is positive integer.
8. the Laser Driven guard method that a kind of projector according to claim 7 uses, which is characterized in that the value of y is
3, m value is 3.
9. according to the Laser Driven guard method that a kind of projector any in claim 4 to 8 uses, feature exists
In the Cx '=Tx/ (T1/n), wherein x r, g, b.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910671570.6A CN110267023A (en) | 2019-07-24 | 2019-07-24 | A kind of Laser Driven protective device and method that projector uses |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910671570.6A CN110267023A (en) | 2019-07-24 | 2019-07-24 | A kind of Laser Driven protective device and method that projector uses |
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| CN110267023A true CN110267023A (en) | 2019-09-20 |
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| CN201910671570.6A Pending CN110267023A (en) | 2019-07-24 | 2019-07-24 | A kind of Laser Driven protective device and method that projector uses |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113645738A (en) * | 2021-07-22 | 2021-11-12 | 西安中科微星光电科技有限公司 | Light source control circuit |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20110260623A1 (en) * | 2010-04-21 | 2011-10-27 | Mitsubishi Electric Corporation | Laser light source device |
| CN102591118A (en) * | 2011-12-15 | 2012-07-18 | 四川长虹电器股份有限公司 | Device and method for protecting light-emitting diode (LED) light source used by projector |
-
2019
- 2019-07-24 CN CN201910671570.6A patent/CN110267023A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20110260623A1 (en) * | 2010-04-21 | 2011-10-27 | Mitsubishi Electric Corporation | Laser light source device |
| CN102591118A (en) * | 2011-12-15 | 2012-07-18 | 四川长虹电器股份有限公司 | Device and method for protecting light-emitting diode (LED) light source used by projector |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113645738A (en) * | 2021-07-22 | 2021-11-12 | 西安中科微星光电科技有限公司 | Light source control circuit |
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Application publication date: 20190920 |