CN103293837A - Rotating speed signal producing module, projection device and color wheel rotating speed control method of projection device - Google Patents
Rotating speed signal producing module, projection device and color wheel rotating speed control method of projection device Download PDFInfo
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- CN103293837A CN103293837A CN2012100423420A CN201210042342A CN103293837A CN 103293837 A CN103293837 A CN 103293837A CN 2012100423420 A CN2012100423420 A CN 2012100423420A CN 201210042342 A CN201210042342 A CN 201210042342A CN 103293837 A CN103293837 A CN 103293837A
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Abstract
The invention provides a rotating speed signal producing module, a projection device and a color wheel rotating speed control method of the projection device. The rotating speed signal producing module is used for detecting a color wheel of the projection device, and the color wheel is provided with an identification element. The rotating speed signal producing module comprises a rotating speed detecting unit, a comparative value generating unit and a comparing unit. The rotating speed detecting unit is used for detecting rotating speed of the color wheel to output an original rotating speed signal. The comparative value generating unit is coupled with the rotating speed detecting unit to generate the comparative value according to the original rotating speed signal, and the comparative value is within an average value of a maximum value and a minimum value and the maximum value. The comparative unit is coupled with the rotating speed detecting unit and the comparative value generating unit to compare the original rotating speed signal and the comparative value to output a modified rotating speed signal.
Description
Technical field
The present invention relates to a kind of projection arrangement, and be particularly related to a kind of projection arrangement and colour wheel method for controlling number of revolution and tach signal generation module.
Background technology
In recent years, (Cathode Ray Tube, CRT) projection arrangement are handled by liquid crystal projection apparatus and digital light gradually that (Digital Light Processing, DLP) product such as projection arrangement replaces to bulky and heavy cathode-ray tube (CRT).These products have characteristic frivolous and that portability is high, and can be directly and digital product link, image projecting is shown.Constantly release cheap and competitive product and increase under the situation of its additional function in each tame manufacturer, these products are except use as bulletin in company, school and other public place, even have had and extend to general family gradually as the usefulness of film appreciation.
Generally speaking, can the configuration colour wheel in the projection arrangement.Optical filter that can the configuration different color on the colour wheel, and colour wheel can rotate by motor, with the foundation sequential light is converted to show required coloured light.Yet, when the dust in the environment is attached on the colour wheel, detect the colour wheel rotating speed and the tach signal exported can be influenced by dust, to such an extent as to the voltage quasi position of tach signal can be offset or produce ripple.
At U.S. bulletin patent number US6155687, disclosed a kind of photoconduction method that is used in colour wheel display synchronous device, when integrating detection signal greater than mean value one difference, the sequential shielded signal of output low level, when integrating detection signal less than mean value one difference, the sequential shielded signal of output high levle.
TaiWan, China bulletin patent number I328138 discloses a kind of projection display device and control method and recording medium, its colour wheel rotation angle sensor disposes illuminating part and light accepting part, when the aperture of the light transmission colour wheel of illuminating part and when conducting to light accepting part, the rotation angle detection signal of colour wheel rotation angle sensor output high levle, when the light of illuminating part is shielded by colour wheel and can't conduct to light accepting part the time, the rotation angle detection signal of colour wheel rotation angle sensor output low level.
Summary of the invention
The present invention proposes a kind of projection arrangement and colour wheel method for controlling number of revolution thereof with tach signal generation module, owing to the more original tach signal of tach signal and the fiducial value revised produce, and fiducial value can dynamically be adjusted, therefore the waveform of the tach signal of revising can be stablized by more original tach signal, is not subjected to the influence of dust on noise and the colour wheel so that control module can correctly calculate the rotating speed of colour wheel.
Other purpose of the present invention and advantage can be further understood from the disclosed technical characterictic of the present invention.
For reaching one of above-mentioned or partly or all purposes or other purpose, one embodiment of the invention provide a kind of projection arrangement, comprise motor, colour wheel, rotation speed detection unit, fiducial value generation unit, comparing unit and control module.Colour wheel is disposed on the motor, and disposes recognition component.Rotation speed detection unit in order to the rotating speed that detects colour wheel to export original tach signal.The fiducial value generation unit is coupled to rotation speed detection unit, in order to produce fiducial value according to original tach signal, wherein between the mean value and maximal value of fiducial value corresponding to the maximal value of original tach signal and minimum value.Comparing unit is coupled to rotation speed detection unit and fiducial value generation unit, in order to compare to export the tach signal of correction according to original tach signal and fiducial value.Control module is coupled to motor and comparing unit, calculates the rotating speed of colour wheel in order to the tach signal according to correction, and adjusts the rotating speed of motor accordingly.
For reaching one of above-mentioned or partly or all purposes or other purpose, one embodiment of the invention also provide a kind of tach signal generation module, and in order to detect the colour wheel of projection arrangement, colour wheel disposes recognition component.The tach signal generation module comprises rotation speed detection unit, fiducial value generation unit and comparing unit.Rotation speed detection unit in order to the rotating speed that detects colour wheel to export original tach signal.The fiducial value generation unit is coupled to rotation speed detection unit, in order to produce fiducial value according to original tach signal, wherein between the mean value and maximal value of fiducial value corresponding to the maximal value of original tach signal and minimum value.Comparing unit couples rotation speed detection unit and fiducial value generation unit, in order to compare to export the tach signal of correction according to original tach signal and fiducial value.
For reaching one of above-mentioned or partly or all purposes or other purpose, one embodiment of the invention also provide a kind of colour wheel method for controlling number of revolution of projection arrangement, and colour wheel is disposed on the motor, and its step comprises as follows: detect the rotating speed of colour wheel to export original tach signal; Produce fiducial value according to original tach signal, wherein between the maximal value and peaked mean value and maximal value of fiducial value corresponding to original tach signal; Original tach signal and fiducial value are compared to export the tach signal of correction; Calculate the rotating speed of colour wheel according to the tach signal of revising; Adjust the rotating speed of motor according to the rotating speed of colour wheel.
Based on above-mentioned, in tach signal generation module, projection arrangement and the colour wheel method for controlling number of revolution thereof of the embodiment of the invention, its fiducial value generation unit produces fiducial value according to original tach signal, and the tach signal that comparing unit is revised according to the comparative result output of original tach signal and fiducial value.Therefore, the waveform of the tach signal of correction can be stablized by more original tach signal, is not subjected to the influence of dust on noise and the colour wheel so that control module can correctly calculate the rotating speed of colour wheel.
For above-mentioned feature and advantage of the present invention can be become apparent, a plurality of embodiment cited below particularly, and conjunction with figs. are described in detail below.
Description of drawings
Fig. 1 is the system schematic according to the projection arrangement of one embodiment of the invention.
Fig. 2 is according to the tach signal generation module of one embodiment of the invention and the system schematic of comparing unit.
Fig. 3 is the drive waveforms synoptic diagram according to one embodiment of the invention Fig. 2.
Fig. 4 is the circuit diagram according to the fiducial value generation unit of one embodiment of the invention.
Fig. 5 is according to the tach signal generation module of another embodiment of the present invention and the system schematic of comparing unit.
Fig. 6 is the drive waveforms synoptic diagram according to another embodiment of the present invention Fig. 5.
Fig. 7 is the circuit diagram according to the fiducial value generation unit of another embodiment of the present invention.
Fig. 8 is the process flow diagram according to the colour wheel method for controlling number of revolution of the projection arrangement of one embodiment of the invention.
[main element symbol description]
100: projection arrangement
110: the tach signal generation module
112: rotation speed detection unit
114: the fiducial value generation unit
116: comparing unit
120: light source module
130: image forms the unit
140: control module
150: colour wheel
150a: recognition component
160: motor
210: the first peak value acquisition units
220: the first valley acquisition units
230: the first arithmetic elements
240,550: comparer
510: the first interchange acquisition units
520: the second peak value acquisition units
530: the second arithmetic elements
540: the second interchange acquisition units
710: operational amplifier
AS: exchange tach signal
B1: first valley
C1: first electric capacity
C2: second electric capacity
C3: the 3rd electric capacity
CL: coloured light
CV: fiducial value
D1: first diode
D2: second diode
D3: the 3rd diode
GND: ground voltage
IRS: original tach signal
L: light
NIRS: the tach signal of correction
P1: first peak value
P2: second peak value
R1: first resistance
R2: second resistance
R3: the 3rd resistance
R4: the 4th resistance
R5: the 5th resistance
R6: the 6th resistance
SC1: control signal
VDD: system voltage
S810～S850: step
Embodiment
Aforementioned and other technology contents, characteristics and effect about the present invention in the detailed description of a plurality of embodiment of following conjunction with figs., can be known to present.The direction term of mentioning in following examples, for example " on ", D score, " preceding ", " back ", " left side ", " right side " etc., only be direction with reference to the accompanying drawings.Therefore, the direction term of use is explanation, but not is used for limiting the present invention.
Fig. 1 is according to the system schematic of the projection arrangement of one embodiment of the invention.Please refer to Fig. 1, in the present embodiment, projection arrangement 100 comprises that tach signal generation module 110, control module 140, image form unit 130, light source module 120, motor 160 and be disposed at colour wheel 150 on the motor 160.Wherein, dispose recognition component 150a on the colour wheel 150, and tach signal generation module 110 comprises rotation speed detection unit 112, fiducial value generation unit 114 and comparing unit 116.
Rotation speed detection unit 112 in order to the rotating speed that detects colour wheel 150 to export original tach signal IRS.Fiducial value generation unit 114 couples rotation speed detection unit 112, in order to produce fiducial value CV according to original tach signal IRS, wherein above-mentioned fiducial value CV is between the maximal value corresponding to the mean value of the maximal value of original tach signal IRS and minimum value and original tach signal IRS, and the account form of above-mentioned fiducial value CV can be set up on their own by the deviser.Comparing unit 116 couples rotation speed detection unit 112 and fiducial value generation unit 114, in order to according to original tach signal IRS with fiducial value CV compares and according to the tach signal NIRS of comparative result output correction.
Control module 140 is coupled to motor 160, image forms unit 130, light source module 120 and comparing unit 116.Control module 140 is sent out control signal SC1 to motor 160, and in order to the rotating speed (being the rotating speed of colour wheel 150) of controlling motor 160, and control module 140 calculates the rotating speed of colour wheel 150 according to the tach signal NIRS that revises.When the rotating speed of the rotating speed of colour wheel 150 and expection not simultaneously, control module 140 is adjusted the rotating speed of motor 160 by control signal SC1, so that the rotating speed that the rotating speed of colour wheel 150 approaches or equals to expect.And, control module 140 can provide light L by control light source module 120, and light L can form coloured light CL and be sent to image formation unit 130 after by colour wheel 150, and control module 140 can reach signal of video signal image formation unit 130, and image forms unit 130 coloured light CL is converted to image strip and is presented at (being display frame, not shown) on the screen.
Furthermore, in the present embodiment, rotation speed detection unit 112 can be launched light (as infrared ray) to colour wheel 150, and produces original tach signal IRS and be sent to fiducial value generation unit 114 and comparing unit 116 according to the reflective condition of light.Wherein, because recognition component 150a influences the reflection of light, so that the waveform of original tach signal IRS can similar pulse wave.Moreover, the influence of (as the light L of the noise dust on the colour wheel 150, rotation speed detection unit 112, light source module 120 etc.) because many external factors, the voltage quasi position of original tach signal IRS may have the situation of skew, and perhaps ripple can appear in original tach signal IRS.
In the present embodiment, the original tach signal IRS of fiducial value generation unit 114 sustainable monitorings, and produce a suitable fiducial value CV to be sent to comparing unit 116 according to original tach signal IRS instantly, reach the function of dynamic adjustment fiducial value CV thus.Comparing unit 116 can be according to the tach signal NIRS of comparative result output correction behind more received fiducial value CV and original tach signal IRS.Control module 140 calculates the rotating speed of colour wheel 150 according to the tach signal NIRS that revises, and adjusts the rotating speed of motor 160 according to the rotating speed of colour wheel 150.Therefore, because the tach signal NIRS that revises produces for the comparative result by fiducial value CV and original tach signal IRS, that is the voltage quasi position of the tach signal NIRS that revises switch to comparative result according to fiducial value CV and original tach signal IRS, therefore the waveform of the tach signal NIRS that revises can be stablized by more original tach signal IRS, that is do not have accurate biased moving and ripple,, control module 140 is not subjected to the influence of dust on noise and the colour wheel 150 so that can correctly calculating the rotating speed (being the rotating speed of colour wheel 160) of motor 160.
Fig. 2 is according to the tach signal generation module of one embodiment of the invention and the system schematic of comparing unit.Please refer to Fig. 1 and Fig. 2, fiducial value generation unit 114 comprises the first peak value acquisition unit 210, the first valley acquisition unit 220 and first arithmetic element 230.The first peak value acquisition unit 210 couples rotation speed detection unit 112, in order to capturing the first peak value P1 of original tach signal IRS, and the first peak value P1 is sent to first arithmetic element 230.The first valley acquisition unit 220 couples rotation speed detection unit 112, in order to capturing the first valley B1 of original tach signal IRS, and the first valley B1 is sent to first arithmetic element 230.
In an embodiment of the present invention, first arithmetic element 230 couples the first peak value acquisition unit 210 and the first valley acquisition unit 220, and the summation that multiply by behind first ratio value with the first valley B1 in order to the difference with the first peak value P1 and the first valley B1 is worth CV as a comparison.Wherein, above-mentioned first ratio value can be set up on their own by the deviser between 0.5 and 1, and in other embodiments, first ratio value can be between 0.5 and 0.9, to improve antimierophonic ability.In the present embodiment, first arithmetic element 230 can be considered the combination of arithmetic mean device and deviator.
In the present embodiment, comparing unit 116 comprises comparer 240.The positive input terminal of comparer 240 couples first arithmetic element 230 to receive fiducial value CV, and the negative input end of comparer 240 couples rotation speed detection unit 112 to receive original tach signal IRS, the tach signal NIRS that the output terminal output of comparer 240 is revised.In other embodiments, comparer 240 can be hysteresis comparator, but the embodiment of the invention is not limited thereto.
Fig. 3 is the drive waveforms synoptic diagram according to one embodiment of the invention Fig. 2.Please be simultaneously with reference to Fig. 2 and Fig. 3, in the present embodiment, the similar pulse wave of the waveform of original tach signal IRS meeting, and because the influence of many external factors, the situation of skew appears in the voltage quasi position of original tach signal IRS, and ripple can appear in original tach signal IRS.In the present embodiment, the first peak value acquisition unit 210 can capture the first peak value P1 of original tach signal IRS, and the first valley acquisition unit 220 can capture the first valley B1 of original tach signal IRS.Then, first arithmetic element 216 is worth CV as a comparison (as 0.75 * (P1-B1)+B1) after the difference (being P1-B1) of the first peak value P1 and the first valley B1 can being multiply by and adding the first valley B1 behind first ratio value (as 0.75).According to Fig. 3, fiducial value CV can be between the mean value of the first peak value P1 of original tach signal IRS (being maximal value) and the first valley B1 (being minimum value) (namely between 0.5 * (P1-B1)+B1) and the first peak value P1.
Then, in this enforcement, with reference to the tach signal NIRS of correction shown in Figure 3.When the voltage quasi position of original tach signal IRS was higher than fiducial value CV, then comparer 240 can the accurate position of output LOW voltage.When the voltage quasi position of original tach signal IRS was lower than fiducial value CV, then comparer 240 can the accurate position of output HIGH voltage.In other embodiments, if the positive input terminal of comparer 240 couples rotation speed detection unit 112 and couples first arithmetic element 230 to receive fiducial value CV with the negative input end that receives original tach signal IRS and comparer 240, then the waveform of the tach signal NIRS of Xiu Zhenging can be in contrast to shown in Figure 3.
Fig. 4 is the circuit diagram that illustrates the fiducial value generation unit of one embodiment of the invention.Please refer to Fig. 3 and Fig. 4, in the present embodiment, the first peak value acquisition unit 210 comprises the first diode D1, first resistance R 1 and first capacitor C 1.The anode of the first diode D1 is in order to receive original tach signal IRS.First resistance R 1 is coupled between the negative electrode and ground voltage GND of the first diode D1.1 of first capacitor C is couple between the negative electrode and ground voltage GND of the first diode D1.Because the influence of the first diode D1, the cross-pressure of first capacitor C 1 can approximate the first peak value P1 of original tach signal IRS, so that the first peak value P1 of the original tach signal IRS of the first peak value acquisition unit, 210 fechtables.
The first valley acquisition unit 220 comprises the second diode D2, second resistance R 2 and second capacitor C 2.The negative electrode of the second diode D2 is in order to receive original tach signal IRS.Second resistance R 2 couples between the anode and system voltage VDD of the second diode D2.Second capacitor C 2 is coupled between the anode and system voltage VDD of the second diode D2.Because the influence of the second diode D2, the cross-pressure of second capacitor C 2 can approximate the first valley B1 that system voltage VDD deducts original tach signal IRS, so that the first valley B1 of the original tach signal IRS of the first valley acquisition unit, 220 fechtables.
First arithmetic element 230 comprises the 3rd resistance R 3 and the 4th resistance R 4.Wherein, first end of the 3rd resistance R 3 couples the first peak value acquisition unit 210 to receive the first peak value P1, and second end of the 3rd resistance R 3 couples comparing unit 116 with output fiducial value CV.First end of the 4th resistance R 4 then is coupled to second end of the 3rd resistance R 3, and the 4th resistance R 4 second ends are coupled to the first valley acquisition unit 220 to receive the first valley B1.Wherein, the partial pressure value of the 3rd resistance R 3 and the 4th resistance R 4 is corresponding to first ratio value, that is ought first ratio value be 0.5, then the resistance value of the 3rd resistance R 3 equals the resistance value of the 4th resistance R 4, when first ratio value is 0.75, then the resistance value of the 4th resistance R 4 is three times in the resistance value of the 3rd resistance R 3.
Fig. 5 is according to the tach signal generation module of another embodiment of the present invention and the system schematic of comparing unit.Please refer to Fig. 5, in the present embodiment, fiducial value generation unit 114 comprises that first exchanges acquisition unit 510, the second peak value acquisition unit 520 and second arithmetic element 530.First exchanges acquisition unit 510 couples rotation speed detection unit 112, in order to part and the output AC tach signal AS that captures alternating voltage among the original tach signal IRS.The second peak value acquisition unit 520 couples first and exchanges acquisition unit 510, exchanges the second peak value P2 of tach signal AS in order to acquisition.Second arithmetic element 530 couples the second peak value acquisition unit 520, be worth CV as a comparison in order to the numerical value that the second peak value P2 be multiply by behind second ratio value, this ratio value CV is between 0.5 and 1, and can be set up on their own by the deviser, in other embodiments, first ratio value can be between 0.5 and 0.9, to improve antimierophonic ability.
Comparing unit 116 comprises that second exchanges acquisition unit 540 and comparer 550.Second exchanges acquisition unit 540 couples rotation speed detection unit 112, in order to the interchange that captures original tach signal IRS partly and output AC tach signal AS to comparer 550.The negative input end of comparer 550 (corresponding first input end) couples second and exchanges acquisition unit 530 to receive interchange tach signal AS, the positive input terminal of comparer 550 (corresponding second input end) couples second arithmetic element 530 to receive fiducial value CV, the tach signal NIRS that the output terminal output of comparer 550 is revised.In one embodiment of this invention, comparer 550 can be hysteresis comparator.
Fig. 6 is the drive waveforms synoptic diagram according to another embodiment of the present invention Fig. 5.Please refer to Fig. 5 and Fig. 6, in the present embodiment, the similar pulse wave of the waveform of original tach signal IRS meeting, and because the influence of many external factors, the situation of skew appears in the voltage quasi position of original tach signal IRS, and ripple can appear in original tach signal IRS.The first interchange acquisition unit 510 and second exchanges acquisition unit 540 can carry out Alternating Component in the signal by the original tach signal IRS of acquisition, and output interchange tach signal AS as shown in Figure 6, wherein exchange the waveform after tach signal AS can be considered the accurate position of original tach signal IRS filtering direct current.And, exchange the negative input end that tach signal AS can be sent to the second peak value acquisition unit 520 and comparer 550 respectively.
The second peak value acquisition unit 520 can acquisition exchanges the second peak value P2 of tach signal AS, and second arithmetic element 530 the second peak value P2 can be multiply by second ratio value (as 0.75) back for fiducial value CV (as 0.75 * P2).In the present embodiment, with reference to the tach signal NIRS of correction shown in Figure 6, when the voltage quasi position that exchanges tach signal AS was higher than fiducial value CV, then comparer 550 can the accurate position of output LOW voltage.When the voltage quasi position that exchanges tach signal was lower than fiducial value CV, then comparer 550 can the accurate position of output HIGH voltage.In other embodiments, if the positive input terminal of comparer 550 couples the second interchange acquisition unit 530 and couples second arithmetic element 530 to receive fiducial value CV to receive the negative input end that exchanges tach signal AS and comparer 550, then the waveform of the tach signal NIRS of Xiu Zhenging can be in contrast to shown in Figure 6.
Fig. 7 is the circuit diagram according to the fiducial value generation unit of another embodiment of the present invention.Please refer to Fig. 7, in the present embodiment, the second peak value acquisition unit 520 comprises operational amplifier 710, the 3rd diode D3 and the 3rd capacitor C 3.The positive input terminal of operational amplifier 710 (corresponding first input end) couples first and exchanges acquisition unit 510 to receive interchange tach signal AS.The anode of the 3rd diode D3 couples the output terminal of operational amplifier 710, and the negative electrode of the 3rd diode D3 is coupled to the negative input end of operational amplifier (corresponding second input end) and exports the second peak value P2.The 3rd capacitor C 3 couples between the negative electrode and ground voltage GND of the 3rd diode D3.
Second arithmetic element 530 comprises the 5th resistance R 5 and the 6th resistance R 6.First end of the 5th resistance R 5 couples the second peak value acquisition unit 520 to receive the second peak value P2, second end output fiducial value CV of the 5th resistance R 5.And the 6th resistance R 6 couples between second end and ground voltage GND of the 5th resistance R 5.The partial pressure value of the 5th resistance R 5 and the 6th resistance R 6 is corresponding to first ratio value, that is ought second ratio value be 0.5, then the resistance value of the 6th resistance R 6 equals the resistance value of the 5th resistance R 5, and when second ratio value is 0.75, then the resistance value of the 6th resistance R 6 is three times in the resistance value of the 5th resistance R 5.
When the voltage quasi position of the positive input terminal of operational amplifier 710 during greater than the voltage quasi position of its negative input end, the output terminal of operational amplifier 710 can the accurate position of output HIGH voltage.Because diode is the cause of conducting forward, the accurate position of high voltage can be by capacitor C 3 chargings of the 3rd diode D3.And when the cross-pressure of capacitor C 3 equaled the voltage of positive input terminal of operational amplifier 710, then the output terminal of operational amplifier 710 can stop output.On the other hand, when the voltage quasi position of the positive input terminal of operational amplifier 710 during less than the voltage quasi position of its negative input end, the output terminal of operational amplifier 710 can the accurate position of output LOW voltage.Because the cause of diode backward stop, capacitor C 3 can not receive the accurate position of the low-voltage of operational amplifier 710 outputs, so capacitor C 3 can be kept cross-pressure originally.According to above-mentioned, the second peak value acquisition unit, 520 fechtables exchange the second peak value P2 of tach signal AS.
Fig. 8 is the process flow diagram according to the colour wheel method for controlling number of revolution of the projection arrangement of one embodiment of the invention.Please refer to Fig. 8, in the present embodiment, the colour wheel method for controlling number of revolution of projection arrangement comprises the following steps.At first, detect the rotating speed of colour wheel to export original tach signal (step S810).Then, produce fiducial value according to original tach signal, wherein fiducial value is corresponding between the maximal value of the mean value of the maximal value of original tach signal and minimum value and original tach signal (step S820).Then, original tach signal and fiducial value are compared to export the tach signal (step S830) of correction.Then, calculate the rotating speed (step S840) of colour wheel according to the tach signal of revising, and adjust the rotating speed (step S850) of motor according to the rotating speed of colour wheel.Wherein, the details of above-mentioned steps can then repeat no more at this with reference to the explanation of above-described embodiment.
In sum, in the tach signal generation module of the embodiment of the invention, projection arrangement and the colour wheel method for controlling number of revolution thereof, its fiducial value generation unit produces fiducial value according to original tach signal, and the tach signal that comparing unit is revised according to the comparative result output of original tach signal and fiducial value.Therefore, the waveform of the tach signal of correction can be stablized by more original tach signal, is not subjected to the influence of dust on noise and the colour wheel so that control module can correctly calculate the rotating speed of colour wheel.
The above only is the preferred embodiments of the present invention, and when not limiting scope of the invention process with this, namely all simple equivalent of doing according to claim of the present invention and summary of the invention change and revise, and all still belong in the scope of patent covering of the present invention.In addition, arbitrary embodiment of the present invention or claim must not reached the disclosed whole purposes of the present invention or advantage or characteristics.In addition, summary and denomination of invention only are used for assisting the usefulness of patent document retrieval, are not to limit interest field of the present invention.In addition, terms such as " first electric capacity " mentioned in the instructions, " second electric capacity " only in order to represent the title of element, are not the quantitative upper limit of limiting element or lower limit.
Claims (22)
1. tach signal generation module, in order to detect the colour wheel of projection arrangement, this colour wheel disposes recognition component, comprising:
Rotation speed detection unit is in order to the rotating speed that detects described colour wheel and export original tach signal;
The fiducial value generation unit, couple described rotation speed detection unit, in order to producing fiducial value according to described original tach signal, between the maximal value of wherein said fiducial value corresponding to the mean value of the maximal value of described original tach signal and minimum value and described original tach signal; And
Comparing unit couples described rotation speed detection unit and described fiducial value generation unit, compares in order to the described original tach signal of foundation and described fiducial value, and the tach signal of output correction.
2. tach signal generation module according to claim 1, wherein said fiducial value generation unit comprises:
The first peak value acquisition unit couples described rotation speed detection unit, in order to capture first peak value of described original tach signal;
The first valley acquisition unit couples described rotation speed detection unit, in order to capture first valley of described original tach signal; And
First arithmetic element, couple the described first peak value acquisition unit and the described first valley acquisition unit, multiply by behind first ratio value summation with described first valley as described fiducial value in order to the difference with described first peak value and described first valley, wherein said first ratio value is between 0.5 and 1.
3. tach signal generation module according to claim 2, the wherein said first peak value acquisition unit comprises:
First diode, the anode of described first diode couples described rotation speed detection unit, and to receive described original tach signal, the negative electrode of described first diode is exported described first peak value;
First resistance is coupled between the negative electrode and ground voltage of described first diode; And
First electric capacity is coupled between the negative electrode and described ground voltage of described first diode.
4. tach signal generation module according to claim 2, the wherein said first valley acquisition unit comprises:
Second diode, the negative electrode of described second diode couples described rotation speed detection unit, and to receive described original tach signal, the anode of described second diode is exported described first valley;
Second resistance is coupled between the anode and system voltage of described second diode; And
Second electric capacity is coupled between the anode and described system voltage of described second diode.
5. tach signal generation module according to claim 2, wherein said first arithmetic element comprises:
The 3rd resistance, first end of described the 3rd resistance couple the described first peak value acquisition unit to receive described first peak value, and second end of described the 3rd resistance couples described comparing unit and exports described fiducial value; And
The 4th resistance, first end of described the 4th resistance couples second end of described the 3rd resistance, and second end of described the 3rd resistance couples the described first valley acquisition unit to receive described first valley;
Wherein, corresponding described first ratio value of the partial pressure value of described the 3rd resistance and described the 4th resistance.
6. tach signal generation module according to claim 1, wherein said fiducial value generation unit comprises:
First exchanges acquisition unit, couples described rotation speed detection unit, in order to AC portion and the output AC tach signal that captures described original tach signal;
The second peak value acquisition unit couples described first and exchanges acquisition unit, in order to capture second peak value of described interchange tach signal; And
Second arithmetic element couples the described second peak value acquisition unit, and in order to described second peak value be multiply by second ratio value as described fiducial value, wherein said second ratio value is between 0.5 and 1.
7. tach signal generation module according to claim 6, the wherein said second peak value acquisition unit comprises:
Operational amplifier, its first input end couple described first and exchange acquisition unit to receive described interchange tach signal;
The 3rd diode, its anode couples the output terminal of described operational amplifier, and its negative electrode couples second input end of described operational amplifier and exports described second peak value; And
The 3rd electric capacity is coupled between the negative electrode and ground voltage of described the 3rd diode.
8. tach signal generation module according to claim 6, wherein said second arithmetic element comprises:
The 5th resistance, its first end couple the described second peak value acquisition unit to receive described second peak value, and its second end is exported described fiducial value; And
The 6th resistance is coupled between second end and ground voltage of described the 5th resistance;
Wherein, corresponding described second ratio value of the partial pressure value of described the 5th resistance and described the 6th resistance.
9. tach signal generation module according to claim 6, wherein said comparing unit comprises:
Second exchanges acquisition unit, couples described rotation speed detection unit, in order to the AC portion that captures described original tach signal and export described interchange tach signal; And
Comparer, its first input end couple described second and exchange acquisition unit to receive described interchange tach signal, and its second input end couples described second arithmetic element to receive described fiducial value, and its output terminal is exported the tach signal of described correction.
10. projection arrangement comprises: image forms unit, light source module and color block module, and wherein said color block module comprises:
Motor;
Colour wheel is disposed on the described motor, and disposes recognition component;
Rotation speed detection unit, in order to the rotating speed that detects described colour wheel to export original tach signal;
The fiducial value generation unit couples described rotation speed detection unit, in order to producing fiducial value according to described original tach signal, between the mean value and described maximal value of wherein said fiducial value corresponding to the maximal value of described original tach signal and minimum value;
Comparing unit couples described rotation speed detection unit and described fiducial value generation unit, in order to compare to export the tach signal of correction according to described original tach signal and described fiducial value; And
Control module couples described motor and described comparing unit, calculates the rotating speed of described colour wheel in order to the tach signal according to this correction, and adjusts the rotating speed of described motor accordingly.
11. projection arrangement according to claim 10, wherein said fiducial value generation unit comprises:
The first peak value acquisition unit couples this described fast detecting unit, in order to capture first peak value of described original tach signal;
The first valley acquisition unit couples described rotation speed detection unit, in order to capture first valley of described original tach signal; And
First arithmetic element, couple the described first peak value acquisition unit and the described first valley acquisition unit, multiply by behind first ratio value summation with described first valley as described fiducial value in order to the difference with described first peak value and described first valley, wherein said first ratio value is between 0.5 and 1.
12. projection arrangement according to claim 11, the wherein said first peak value acquisition unit comprises:
First diode, its anode couple described rotation speed detection unit to receive described original tach signal, and its negative electrode is exported described first peak value;
First resistance is coupled between the negative electrode and ground voltage of described first diode; And
First electric capacity is coupled between the negative electrode and described ground voltage of described first diode.
13. projection arrangement according to claim 11, the wherein said first valley acquisition unit comprises:
Second diode, its negative electrode couple described rotation speed detection unit to receive described original tach signal, and its anode is exported described first valley;
Second resistance is coupled between the anode and system voltage of described second diode; And
Second electric capacity is coupled between the anode and described system voltage of described second diode.
14. projection arrangement according to claim 11, wherein said first arithmetic element comprises:
The 3rd resistance, its first end couple the described first peak value acquisition unit to receive described first peak value, and its second end couples described comparing unit and exports described fiducial value; And
The 4th resistance, its first end couples second end of described the 3rd resistance, and its second end couples the described first valley acquisition unit to receive described first valley;
Wherein, the partial pressure value of described the 3rd resistance and described the 4th resistance is to should ratio value.
15. projection arrangement according to claim 10, wherein said fiducial value generation unit comprises:
First exchanges acquisition unit, couples described rotation speed detection unit, in order to capturing the part of alternating voltage in the described original tach signal, and the output AC tach signal;
The second peak value acquisition unit couples described first and exchanges acquisition unit, in order to capture second peak value of described interchange tach signal; And
Second arithmetic element couples the described second peak value acquisition unit, and in order to described second peak value be multiply by second ratio value as described fiducial value, wherein said second ratio value is between 0.5 and 1.
16. projection arrangement according to claim 15, the wherein said second peak value acquisition unit comprises:
Operational amplifier, the first input end of described operational amplifier couple described first and exchange acquisition unit to receive described interchange tach signal;
The 3rd diode, the anode of described the 3rd diode couples the output terminal of described operational amplifier, and the negative electrode of described the 3rd diode couples second input end of described operational amplifier and exports described second peak value; And
The 3rd electric capacity is coupled between the negative electrode and ground voltage of described the 3rd diode.
17. projection arrangement according to claim 15, wherein said second arithmetic element comprises:
The 5th resistance, first end of described the 5th resistance couple the described second peak value acquisition unit to receive described second peak value, and second end of described the 5th resistance is exported described fiducial value; And
The 6th resistance is coupled between second end and ground voltage of described the 5th resistance;
Wherein, corresponding described second ratio value of the partial pressure value of described the 5th resistance and described the 6th resistance.
18. projection arrangement according to claim 15, wherein said comparing unit comprises:
Second exchanges acquisition unit, couples described rotation speed detection unit, in order to the part that captures alternating voltage in the described original tach signal and export described interchange tach signal; And
Comparer, the first input end of described comparer couples described second and exchanges acquisition unit to receive described interchange tach signal, second input end of described comparer couples described second arithmetic element to receive described fiducial value, and the output terminal of described comparer is exported the tach signal of described correction.
19. the colour wheel method for controlling number of revolution of a projection arrangement, described colour wheel is disposed on the motor, comprising:
Detect the rotating speed of described colour wheel to export original tach signal;
Produce fiducial value according to described original tach signal, between the maximal value of wherein said fiducial value corresponding to the mean value of the maximal value of described original tach signal and minimum value and described original tach signal;
Described original tach signal and described fiducial value are compared to export the tach signal of correction;
Calculate the rotating speed of described colour wheel according to the tach signal of described correction; And
Adjust the rotating speed of this motor according to the rotating speed of described colour wheel.
20. the colour wheel method for controlling number of revolution of projection arrangement according to claim 19 wherein comprises according to the step that described original tach signal produces described fiducial value:
Capture first peak value of described original tach signal;
Capture first valley of described original tach signal; And
The difference of described first peak value and described first valley be multiply by behind first ratio value summation with described first valley as described fiducial value, and wherein said first ratio value is between 0.5 and 1.
21. the colour wheel method for controlling number of revolution of projection arrangement according to claim 19 wherein comprises according to the step that described original tach signal produces described fiducial value:
Capture the part of alternating voltage in the described original tach signal with the output AC tach signal;
Capture second peak value of described interchange tach signal; And
Described second peak value be multiply by second ratio value as described fiducial value, and wherein said second ratio value is between 0.5 and 1.
22. the colour wheel method for controlling number of revolution of projection arrangement according to claim 21, the tach signal that wherein described original tach signal and described fiducial value is compared to export described correction comprises:
Described interchange tach signal and described fiducial value are compared to export the tach signal of described correction.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210042342.0A CN103293837B (en) | 2012-02-23 | 2012-02-23 | Rotating speed signal producing module, projection device and color wheel rotating speed control method of projection device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210042342.0A CN103293837B (en) | 2012-02-23 | 2012-02-23 | Rotating speed signal producing module, projection device and color wheel rotating speed control method of projection device |
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| CN103293837A true CN103293837A (en) | 2013-09-11 |
| CN103293837B CN103293837B (en) | 2015-05-13 |
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| CN201210042342.0A Expired - Fee Related CN103293837B (en) | 2012-02-23 | 2012-02-23 | Rotating speed signal producing module, projection device and color wheel rotating speed control method of projection device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106124792A (en) * | 2016-06-13 | 2016-11-16 | 海信集团有限公司 | A kind of colour wheel rotating speed measurement method and device |
| CN106707670A (en) * | 2016-12-26 | 2017-05-24 | 苏州佳世达光电有限公司 | Color wheel module and projector |
| CN106842786A (en) * | 2015-12-07 | 2017-06-13 | 深圳市绎立锐光科技开发有限公司 | A kind of laser projection device |
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| CN106124792B (en) * | 2016-06-13 | 2019-01-25 | 海信集团有限公司 | A kind of colour wheel rotating speed measurement method and device |
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Also Published As
| Publication number | Publication date |
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| CN103293837B (en) | 2015-05-13 |
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