CN106896635B - A kind of laser drive current burr removal circuit and method - Google Patents
A kind of laser drive current burr removal circuit and method Download PDFInfo
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- CN106896635B CN106896635B CN201710173887.8A CN201710173887A CN106896635B CN 106896635 B CN106896635 B CN 106896635B CN 201710173887 A CN201710173887 A CN 201710173887A CN 106896635 B CN106896635 B CN 106896635B
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/20—Lamp housings
- G03B21/206—Control of light source other than position or intensity
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/20—Lamp housings
- G03B21/2006—Lamp housings characterised by the light source
- G03B21/2033—LED or laser light sources
- G03B21/204—LED or laser light sources using secondary light emission, e.g. luminescence or fluorescence
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K5/00—Manipulating of pulses not covered by one of the other main groups of this subclass
- H03K5/125—Discriminating pulses
- H03K5/1252—Suppression or limitation of noise or interference
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Optics & Photonics (AREA)
- Semiconductor Lasers (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
Abstract
The application discloses a kind of laser drive current burr removal circuit and method and laser projection display method in fact.The circuit includes：The driving current output end of first NOT gate, input terminal and previous stage connects, and output end is connect with the first input end of the first AND OR NOT gate；Second NOT gate, input terminal control signal for input pulse, and output end is connect with the second input terminal of first AND OR NOT gate, and is connect with the 4th input terminal of the second AND OR NOT gate；First AND OR NOT gate, third input terminal are connect with the output end of the second AND OR NOT gate, and output end is connect with the first input end of the second AND OR NOT gate, and the first output end as the electric current；The driving current output end of second AND OR NOT gate, third input terminal and previous stage connects, and output end is connect with the third input terminal of the first AND OR NOT gate, and the second output terminal as the circuit.The circuit, which can eliminate current spikes, can't extend the response time of driving current.
Description
Technical field
This application involves technical field of laser display more particularly to a kind of laser drive current burr removal circuit and sides
Method.
Background technique
RGB or RGBY laser projection display technology be with high power red (R), green (G) and blue (B) driving current or it is red,
Green, Lan Hehuang (Y) driving current drives laser to issue different colours laser, and one-wavelength laser is mixed into the display skill of full color
Art.By taking RGBY laser projection is shown as an example, as shown in Figure 1, R, G, B and Y color control current signal pass through PWM (Pulse
Width Modulation, pulse width modulation) after be respectively connected to the input terminal S1 to S4 of multiple selector, EN is enabled letter
Number, A0, A1 and A2 are respectively RGBY gating signal, can by the switch of the control selections S1 of A0, A1 and A2 to the channel S4, from
And the laser all the way for synthesizing tetra- tunnel color of R, G, B, Y control current signal in one period comprising tetra- color information of R, G, B, Y drives
Streaming current pulse signal, then exported from output end D, to drive laser.
But the pwm signal of R, G, B, Y can occur to hold simultaneously during the gating of multiple selector or what is closed simultaneously shows
As (competition and venture phenomenon), the driving current burr for causing the end D to export is serious, influences the image quality of display.The prior art solves
The way of driving current burr is to increase filter capacitor after multiple selector, by filter capacitor to the output of multiple selector into
Row filtering, it is this with smooth driving current, but since the smoothing effect of filter capacitor generally can not take into account high and low frequency two-stage
Mode eliminates driving current burr, and the effect is unsatisfactory, and the addition of capacitor can extend the response time of driving current.
Summary of the invention
This application provides a kind of laser drive current burr removal circuit and methods, to solve laser drive current
There are problems that burr.
In a first aspect, this application provides a kind of laser drive current burrs to remove circuit, the circuit includes：
First NOT gate, the input terminal of first NOT gate and the driving current output end of previous stage driving current output circuit
Connection, the output end of first NOT gate are connect with the first input end of the first AND OR NOT gate；
The input terminal of second NOT gate, second NOT gate controls signal, the output of second NOT gate for input pulse
End is connect with the second input terminal of first AND OR NOT gate, and is connect with the 4th input terminal of the second AND OR NOT gate, and described the
The first input end of one AND OR NOT gate and the second input terminal are same two input terminals with door in first AND OR NOT gate；
The output end of first AND OR NOT gate, the third input terminal of first AND OR NOT gate and second AND OR NOT gate connects
It connects, the output end of first AND OR NOT gate is connect with the first input end of second AND OR NOT gate, and as the circuit
The first output end；
Second AND OR NOT gate, the drive of the third input terminal and previous stage driving current output circuit of second AND OR NOT gate
The connection of streaming current output end, the output end of second AND OR NOT gate are connect with the third input terminal of first AND OR NOT gate,
And the second output terminal as the circuit, the third input terminal and the 4th input terminal of second AND OR NOT gate are described second
Same two input terminals with door in AND OR NOT gate.
Second aspect, present invention also provides a kind of laser drive current burr minimizing technology, the method uses the
Laser drive current burr described in one side removes circuit, believes in the input terminal of second NOT gate plus pulse control
Number, the period of the pulse control signal is the minimum pulse width 1/N of the driving current, and wherein N is the nature in addition to 0
Number.
The third aspect, present invention also provides a kind of laser projection display method, the method is used described in second aspect
Laser drive current burr minimizing technology, and the synchronization time of colour wheel in laser light projection display system is postponed into the pulse
Control 1/2 period of signal.
Fourth aspect, present invention also provides a kind of laser light projection display systems, and the system comprises described in first aspect
Laser drive current burr remove circuit.
Laser drive current burr provided herein removes circuit, opens in a drive current signal period
Play latch when the beginning, the output of the circuit is made to keep the size of a upper period last drive current signal, so as to
The transient state burr of driving current is enough completely eliminated, and the circuit does not include capacitor, there is higher response efficiency.
Detailed description of the invention
In order to illustrate more clearly of the technical solution of the application, letter will be made to attached drawing needed in the embodiment below
Singly introduce, it should be apparent that, for those of ordinary skills, without any creative labor,
It is also possible to obtain other drawings based on these drawings.
Fig. 1 is the multiple selector exemplary diagram of RGBY laser light projection display system；
Fig. 2 is the circuit diagram that the application laser drive current burr removes circuit；
Fig. 3 is the working principle exemplary diagram that the application laser drive current burr removes circuit.
Specific embodiment
Referring to fig. 2, the circuit diagram of circuit is removed for the application laser drive current burr.Laser drive current, example
It is the input of the circuit such as the driving current that RGBY multiple selector exports, burr elimination is carried out by the circuit, output is flat
Sliding driving current.As shown in Fig. 2, the circuit includes：
First NOT gate, the input terminal and previous stage driving current output circuit such as RGBY multi-path choice of first NOT gate
The driving current output end (end D) of device connects, and the first input end of the output end of first NOT gate and the first AND OR NOT gate is 1.
Connection；
Second NOT gate, the input terminal of second NOT gate control signal CP for input pulse, second NOT gate it is defeated
2. outlet is connect with the second input terminal of first AND OR NOT gate, and 6. connect with the 4th input terminal of the second AND OR NOT gate,
1. 2. the first input end of first AND OR NOT gate is same in first AND OR NOT gate and door with the second input terminal
Two input terminals；
First AND OR NOT gate, the third input terminal of the first AND OR NOT gate 3. output end with second AND OR NOT gate
4. connection, the output end Q of first AND OR NOT gate are connect with the first input end of second AND OR NOT gate, and as described
First output end of circuit；
Second AND OR NOT gate, the third input terminal of second AND OR NOT gate 5. with previous stage driving current output circuit
The connection of driving current output end, the output end of second AND OR NOT gate3. with the third input terminal of first AND OR NOT gate
Connection, and the second output terminal as the circuit, the third input terminal of second AND OR NOT gate 5. with the 4th input terminal 6.
For two input terminals with door same in second AND OR NOT gate.
Wherein, there are four input terminals for AND OR NOT gate, are divided into two groups, the first input end of each AND OR NOT gate and second input
End is first group, and third input terminal and the 4th input terminal are second group, and first group defeated with two of door for one in AND OR NOT gate
Enter end, second group of two input terminal for another and door in the AND OR NOT gate.Two AND OR NOT gates used herein, first
The output end of AND OR NOT gate is positive output end Q, and the output end of the second AND OR NOT gate is reversed-phase output
When competition occurs for multiple selector with venture phenomenon, the drive current signal of output is in the phenomenon that competes or take a risk
The moment of generation generates transient state burr, and the working principle that the application laser drive current burr removes circuit is the circuit
It is equivalent to a latch, to the circuit plus the pulse control signal CP in setting period, the week of the pulse control signal
Phase is the minimum pulse width 1/N of the driving current, and wherein N is the natural number in addition to 0, in this way, in drive current
When a cycle of signal starts, the circuit plays latch, the drive current that output keeps previous cycle last
Signal magnitude, so as to avoid the generation of burr, after pulse control signal CP becomes 0 by 1, the circuit conducting, output with
Drive current signal currently entered it is in the same size, and pulse control signal by 0 become 1 after, play latch again,
Keep the size of drive current signal currently entered, and so on, complete drive current signal a cycle
Output.
Come below with the display application of RGB laser projection for example, the input of multiple selector controls electricity for R, G, B color
The pwm signal of stream exports as R, G, B drive current signal sequence, and the period of R, G, B drive current signal is identical
, but duty ratio is not necessarily identical.As shown in figure 3, the minimum duty cycle of the drive current signal of multiple selector output
Duty ratio for 1%, R drive current signal is minimum duty cycle, i.e. the duty ratio of 1%, G drive current signal is
The period of 50%, CP are identical as the minimum pulse width of drive current signal (N=1), therefore the period of CP in this example
It is identical as the pulse width of R drive current signal.When the input of the application laser drive current burr removal circuit is R
When drive current signal, when CP is 1, the output of the circuit keeps a upper period last drive current signal
Size, that is, 0, the generation of burr is just avoided in this way；After CP becomes 0, the R driving current of the output and input of the circuit
Pulse signal is identical；After CP becomes 1, the size of the output when output holding CP of the circuit is 0 is driven to complete a R
The output of the pulse width of streaming current pulse signal；After CP becomes 0 again, the R driving current arteries and veins of the output and input of the circuit
It is identical to rush signal, since R drive current signal becomes 0 at this time, the output of the circuit becomes 0, and is always maintained at
To the end cycle of R drive current signal.
It is 1 in CP when the input of the application laser drive current burr removal circuit is G drive current signal
When, the output of the circuit keeps the size of a upper period last drive current signal, that is, 0, just avoids in this way
The generation of burr；After CP becomes 0, the output of the circuit is identical as the G drive current signal of input；After CP becomes 1, institute
The size of output when the output holding CP for stating circuit is 0；After CP becomes 0 again, the R of output with the input of the circuit drives electricity
Signal pulse stream is identical, and since G drive current signal not yet becomes 0 at this time, the output of the circuit is still kept
Originally size；The rest may be inferred, and when CP becomes 0 again, if G drive current signal becomes 0, the output of the circuit becomes
0, the output of the pulse width of a G drive current signal is completed, the output (0) of the circuit is always maintained at G driving
The end cycle of current pulse signal.
The output process and B drive current signal of G drive current signal and R drive current signal it is defeated
Process is identical out, repeats no more.
Laser drive current burr provided herein removes circuit, opens in a drive current signal period
When the beginning, the output of the circuit keeps the size of a upper period last drive current signal, drives so as to completely eliminate
The transient state burr of streaming current, and the circuit does not include capacitor, will not extend the response time of driving current, has higher
Response efficiency.
Circuit is removed using above-mentioned laser drive current burr, the application also provides a kind of laser drive current burr
Minimizing technology adds pulse control signal, and the period of the pulse control signal by the input terminal in second NOT gate
For the minimum pulse width 1/N of the driving current, wherein N is the natural number in addition to 0, come control the circuit latch and
Function is connected, to avoid the generation of driving current burr, and does not influence the response time of driving current.
Using the laser drive current burr minimizing technology, the application also provides a kind of laser projection display method,
The method is applied to laser light projection display system.Stimulated light device driving current burr removes the influence of circuit latch effect,
Output signal can delay 1/2 period of pulse control signal compared to input signal, therefore in the laser projection display method
Make to postpone the pulse control letter synchronization time of the colour wheel synchronization time of colour wheel in middle adjustment laser light projection display system
Number 1/2 period, the output to guarantee the circuit is synchronous with the colour wheel holding in laser projection system.
Application additionally provides a kind of laser light projection display system, and the system comprises laser drive currents shown in Fig. 2
Burr removes circuit.
It should be noted that, in this document, the relational terms of such as " first " and " second " or the like are used merely to one
A entity or operation with another entity or operate distinguish, without necessarily requiring or implying these entities or operation it
Between there are any this actual relationship or backwards.Moreover, the terms "include", "comprise" or its any other variant are intended to
Cover non-exclusive inclusion, so that the process, method, device or the equipment that include a series of elements not only include those
Element, but also including other elements that are not explicitly listed, or further include for this process, method, device or setting
Standby intrinsic element.In the absence of more restrictions, the element limited by sentence "including a ...", it is not excluded that
There is also other identical elements in process, method, device or the equipment for including the element.
Above-described presently filed embodiment does not constitute the restriction to the application protection scope.
Claims (4)
1. a kind of laser drive current burr removes circuit, which is characterized in that the circuit includes：
First NOT gate, the input terminal of first NOT gate and the driving current output end of previous stage driving current output circuit connect
It connects, the output end of first NOT gate is connect with the first input end of the first AND OR NOT gate；
Second NOT gate, the input terminal of second NOT gate control signal for input pulse, the output end of second NOT gate with
Second input terminal of first AND OR NOT gate connects, and connect with the 4th input terminal of the second AND OR NOT gate, described first and
The first input end of nor gate and the second input terminal are same two input terminals with door in first AND OR NOT gate；
First AND OR NOT gate, the third input terminal of first AND OR NOT gate are connect with the output end of second AND OR NOT gate,
The output end of first AND OR NOT gate is connect with the first input end of second AND OR NOT gate, and as the circuit
One output end；
Second AND OR NOT gate, the third input terminal of second AND OR NOT gate and the driving electricity of previous stage driving current output circuit
Output end connection is flowed, the output end of second AND OR NOT gate is connect with the third input terminal of first AND OR NOT gate, and is made
For the second output terminal of the circuit, the third input terminal and the 4th input terminal of second AND OR NOT gate be described second with or
Same two input terminals with door in NOT gate.
2. a kind of laser drive current burr minimizing technology, which is characterized in that driven using laser described in claim 1
Current spikes remove circuit,
Pulse control signal is added in the input terminal of second NOT gate, the period of the pulse control signal is the driving electricity
The minimum pulse width 1/N of stream, wherein N is the natural number in addition to 0.
3. a kind of laser projection display method, which is characterized in that gone using laser drive current burr as claimed in claim 2
Except method, and 1/2 period that the pulse control signal will be postponed the synchronization time of colour wheel in laser light projection display system.
4. a kind of laser light projection display system, which is characterized in that gone including laser drive current burr described in claim 1
Except circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710173887.8A CN106896635B (en) | 2017-03-22 | 2017-03-22 | A kind of laser drive current burr removal circuit and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710173887.8A CN106896635B (en) | 2017-03-22 | 2017-03-22 | A kind of laser drive current burr removal circuit and method |
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| Publication Number | Publication Date |
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| CN106896635A CN106896635A (en) | 2017-06-27 |
| CN106896635B true CN106896635B (en) | 2018-11-16 |
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| CN109226969A (en) * | 2018-11-05 | 2019-01-18 | 苏州大学 | Deburring laser head and the laser deburring device for applying it |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5844429A (en) * | 1996-02-01 | 1998-12-01 | Lg Semicon Co., Ltd. | Burn-in sensing circuit |
| CN1917368A (en) * | 2006-09-12 | 2007-02-21 | 北京中星微电子有限公司 | Method and device for removing burrs in signal |
| CN101299159A (en) * | 2008-07-01 | 2008-11-05 | 深圳市远望谷信息技术股份有限公司 | Clock switch circuit |
| EP2139113A1 (en) * | 2008-06-23 | 2009-12-30 | Dialog Semiconductor GmbH | Glitch-free clock suspend and resume circuit |
| CN105652574A (en) * | 2016-03-29 | 2016-06-08 | 海信集团有限公司 | Color wheel synchronization control method and device for laser projection device |
| CN106249530A (en) * | 2016-06-30 | 2016-12-21 | 海信集团有限公司 | Projection light source drives control circuit |
-
2017
- 2017-03-22 CN CN201710173887.8A patent/CN106896635B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5844429A (en) * | 1996-02-01 | 1998-12-01 | Lg Semicon Co., Ltd. | Burn-in sensing circuit |
| CN1917368A (en) * | 2006-09-12 | 2007-02-21 | 北京中星微电子有限公司 | Method and device for removing burrs in signal |
| EP2139113A1 (en) * | 2008-06-23 | 2009-12-30 | Dialog Semiconductor GmbH | Glitch-free clock suspend and resume circuit |
| CN101299159A (en) * | 2008-07-01 | 2008-11-05 | 深圳市远望谷信息技术股份有限公司 | Clock switch circuit |
| CN105652574A (en) * | 2016-03-29 | 2016-06-08 | 海信集团有限公司 | Color wheel synchronization control method and device for laser projection device |
| CN106249530A (en) * | 2016-06-30 | 2016-12-21 | 海信集团有限公司 | Projection light source drives control circuit |
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| Publication number | Publication date |
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| CN106896635A (en) | 2017-06-27 |
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Address after: 266555 Qingdao economic and Technological Development Zone, Shandong, Hong Kong Road, No. 218 Patentee after: Hisense Video Technology Co.,Ltd. Address before: 266555 Qingdao economic and Technological Development Zone, Shandong, Hong Kong Road, No. 218 Patentee before: HISENSE ELECTRIC Co.,Ltd. |
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