TWI661234B - Phase calibration method and laser projector - Google Patents

Abstract

A phase correction method includes the following steps: (a) generating a synchronization signal and transmitting it to a laser driver; (b) controlling the switching of the laser light source according to the timing of the synchronization signal; (c) measuring the laser light of the laser light source passing in sequence The first light intensity after the fluorescent wheel and the color wheel; (d) changing the phase of the fluorescent wheel or the color wheel; (e) measuring the second light intensity after the laser light passes through the fluorescent wheel and the color wheel in sequence; (f) again Change the phase of the fluorescent wheel or color wheel; (g) measure the third light intensity after the laser light passes through the fluorescent wheel and the color wheel in sequence; (h) when the second light intensity is greater than the first light intensity and the third light intensity When the light intensity is greater than the second light intensity, or when the second light intensity is less than the first light intensity and the third light intensity is greater than the first light intensity, steps (f) and (g) are repeated.

Description

Phase correction method and laser projector

The present invention relates to a phase correction method and a laser projector, and more particularly to a phase correction method for a fluorescent wheel and a color wheel and a laser projector.

In the traditional laser projector phase correction method, a light detector is set in front of the projector, and the light detector is connected to an oscilloscope. Then manually adjust the phase of the fluorescent wheel or the color wheel step by step, and find out the best phase of the fluorescent wheel or the color wheel according to whether the waveform of the oscilloscope is square.

Therefore, the traditional laser projector phase correction method not only requires manpower, but also requires more time and equipment costs. In addition, judging the optimal phase of the fluorescent wheel or color wheel from the waveform makes it difficult to improve the accuracy of phase correction.

One technical aspect of this disclosure is a phase correction method applied to a laser projector.

According to some embodiments of the present disclosure, a phase correction method includes the following steps. First, in step (a), the processor generates a synchronization signal and transmits it to the laser driver. Then in step (b), the laser driver controls the switching of the laser light source according to the timing of the synchronization signal. Then, in step (c), the first light intensity of the laser light of the laser light source passing through the fluorescent wheel and the color wheel in sequence is measured using a light detector. Then in step (d), the phase of the fluorescent wheel or the phase of the color wheel is changed. Then in step (e), the photodetector is used to measure the second light intensity of the laser light after passing through the fluorescent wheel and the color wheel in sequence. Then in step (f), the phase of the fluorescent wheel or the phase of the color wheel is changed again. Then, in step (g), the photodetector is used to measure the third light intensity of the laser light after passing through the fluorescent wheel and the color wheel in sequence. Then in step (h), when the second light intensity is greater than the first light intensity and the third light intensity is greater than the second light intensity, repeat steps (f) and (g), or when the second light intensity is less than the first light intensity When a light intensity and a third light intensity are greater than the first light intensity, steps (f) and (g) are repeated.

In some embodiments of the present disclosure, step (a) of the phase correction method further includes synchronizing the timing of the synchronization signal with the timing of the color wheel.

In some embodiments of the present disclosure, the first light intensity, the second light intensity, and the third light intensity in steps (c), (e), and (g) of the phase correction method are read by the light detector. The integral of value and time.

In some embodiments of the present disclosure, in step (c), step (e), and step (g) of the phase correction method, the light detector includes information of the first light intensity, the second light intensity, and the third light intensity. Transfer to laser driver.

In some embodiments of the present disclosure, in steps (c), (e), and (g) of the phase correction method, the processor reads the first light intensity, the second light intensity, and the third light from the laser driver. Information about intensity.

In some embodiments of the present disclosure, step (d) of the phase correction method further includes the processor controlling the color wheel motor driver to change the phase of the color wheel, and step (f) further includes the processor according to the first light intensity and the second The light intensity information controls the color wheel motor driver to change the phase of the color wheel.

In some embodiments of the present disclosure, step (d) of the phase correction method further includes the processor controlling the fluorescent wheel motor driver to change the phase of the fluorescent wheel, and step (f) further includes the processor according to the first light intensity and the second The light intensity information controls the phosphor wheel motor driver to change the phase of the phosphor wheel.

In some embodiments of the present disclosure, step (d) of the phase correction method further includes increasing or decreasing the phase of the color wheel or the phase of the fluorescent wheel, and step (f) further includes increasing or decreasing the phase of the color wheel or the phase of the fluorescent wheel. Phase.

In some embodiments of the present disclosure, step (d) of the phase correction method further includes fixing the phase of the color wheel and increasing or decreasing the phase of the fluorescent wheel, and step (f) includes fixing the phase of the color wheel and increasing or decreasing the phase of the fluorescent wheel. Phase.

In some embodiments of the present disclosure, in step (d) of the phase correction method, the phase change of the fluorescent wheel is not repeated, and in step (f), the phase change of the fluorescent wheel is not repeated.

In some embodiments of the present disclosure, step (d) of the phase correction method further includes fixing the phase of the fluorescent wheel and increasing or decreasing the color wheel phase. Step (f) includes fixing the phase of the fluorescent wheel and increasing or decreasing the color wheel. Of phase.

In some embodiments of the present disclosure, in step (d) of the phase correction method, the phase change of the color wheel is not repeated, and in step (f), the phase change of the color wheel is not repeated.

In some embodiments of the present disclosure, step (h) of the phase correction method further includes changing the phase of the fluorescent wheel to correspond when the second light intensity is greater than the first light intensity and the third light intensity is less than the second light intensity. The phase of the fluorescent wheel of the second light intensity or the phase of the color wheel is changed to the phase of the color wheel corresponding to the second light intensity.

In some embodiments of the present disclosure, step (h) of the phase correction method further includes, when the second light intensity is less than the first light intensity and the third light intensity is less than the first light intensity, changing the phase of the fluorescent wheel to correspond to The phase of the fluorescent wheel of the first light intensity or the phase of the color wheel is changed to the phase of the color wheel corresponding to the first light intensity.

Another technical aspect of this disclosure is a laser projector.

According to some embodiments of the present disclosure, a laser projector includes a laser light source module, a processor, a fluorescent wheel, a color wheel, and a light detector. The laser light source module has a laser driver, and the laser light source module is arranged to generate laser light. The processor is electrically connected to the laser driver, and is set to generate a synchronization signal and transmit it to the laser driver. The fluorescent wheel is electrically connected to the processor. The color wheel is electrically connected to the processor, and the fluorescent wheel is located between the laser light source module and the color wheel. The light detector is electrically connected to the laser driver. The color wheel is located between the fluorescent wheel and the light detector. The light detector is set to detect the laser light source module and pass through the fluorescent wheel and the color wheel in sequence. The intensity of the laser light.

In some embodiments of the present disclosure, the laser projector further includes a reflector, wherein the reflector is located between the color wheel and the light detector, and the light detector is located on a side of the reflector facing away from the color wheel.

In some embodiments of the present disclosure, the laser projector further includes a housing, wherein the light detector is located in the housing.

In some embodiments of the disclosure, the laser projector further includes a fluorescent wheel motor driver, wherein the fluorescent wheel is electrically connected to the processor through the fluorescent wheel motor driver, and the processor is configured to control the fluorescent wheel motor driver to change the phase of the fluorescent wheel. . The laser projector also includes a color wheel motor driver, wherein the color wheel is electrically connected to the processor via the color wheel motor driver, and the processor is configured to control the color wheel motor driver to change the phase of the color wheel.

In the above embodiment of the present disclosure, the phase correction method and the laser projector of the present disclosure enable the laser light to be generated according to the timing of the synchronization signal, the light intensity is measured by the photodetector, and the phase and measurement are repeatedly changed by the processor. The operation steps of the light intensity until the relative maximum value of the light intensity integrated value is found. Therefore, the phase correction method and laser projector disclosed in this disclosure do not need to install an additional light intensity detector outside the projector, and do not need to manually determine whether the fluorescent wheel and the color wheel are in the optimal phase by using the waveform displayed by the oscilloscope. . In this way, the consumption of manpower and time and production costs can be greatly reduced, and the inconvenience of relying on manpower to gradually change the phase and perform light intensity measurement has been improved.

In the following, a plurality of embodiments of the present invention will be disclosed graphically. For the sake of clarity, many practical details will be described in the following description. It should be understood, however, that these practical details should not be used to limit the invention. That is, in some embodiments of the present invention, these practical details are unnecessary. In addition, in order to simplify the drawings, some conventional structures and components will be shown in the drawings in a simple and schematic manner.

FIG. 1 is a block diagram of a laser projector 100 according to an embodiment of the disclosure. In this embodiment, the laser projector 100 is a single-chip laser projector. The laser projector 100 includes a laser light source module 110, a processor 120, a fluorescent wheel 130, a color wheel 140, and a light detector 150.

The laser light source module 110 includes a laser driver 112 and a laser light source 114, and the processor 120 is electrically connected to the laser driver 112. The processor 120 is configured to generate a synchronization signal 122 and transmit it to the laser driver 112. The fluorescent wheel 130 is electrically connected to the processor 120. The color wheel 140 is electrically connected to the processor 120. The fluorescent wheel 130 is located between the laser light source module 110 and the color wheel 140. The light detector 150 is electrically connected to the laser driver 112. The color wheel 140 is located between the fluorescent wheel 130 and the light detector 150. The light detector 150 is configured to detect various colored light intensities generated by the laser light 160 after passing through the fluorescent wheel 130 and the color wheel 140 in sequence and transmit individual intensity information to the laser driver 112.

The laser projector 100 further includes a housing 101, an integrating column 102, a relay lens 103, a reflecting mirror 104, a digital micromirror device (DMD) 105, and a projection lens 106. The photo detector 150 is located inside the casing 101. The integrating column 102 and the relay lens 103 are located between the fluorescent wheel 130 and the color wheel 140. The reflecting mirror 104 is located between the color wheel 140 and the light detector 150. The light detector 150 is located on the side of the reflector 104 facing away from the color wheel 140. In this embodiment, the laser light source module 110, the fluorescent wheel 130, the color wheel 140, and the light detector 150 are positioned substantially on the same straight line. The reflecting mirror 104 can reflect most of the laser light 160 and transmit the remaining laser light 160. Therefore, the light detector 150 can measure the laser light 160 transmitted from the mirror 104 after passing through the fluorescent wheel 130 and the color wheel 140.

In addition, the laser projector 100 further includes a phosphor wheel motor driver 132 and a color wheel motor driver 142. The fluorescent wheel 130 is electrically connected to the processor 120 through a fluorescent wheel motor driver 132. The processor 120 is configured to control the fluorescent wheel motor driver 132 to change the phase of the fluorescent wheel 130. The color wheel 140 is electrically connected to the processor 120 through the color wheel motor driver 142. The processor 120 is configured to control the color wheel motor driver 142 to change the phase of the color wheel 140.

In this embodiment, when the laser projector 100 is in use, the laser driver 112 turns on the laser light source 114 and generates laser light 160. According to the phase of the fluorescent wheel 130, the laser light 160 generates blue light 161B after passing through the glass portion of the fluorescent wheel 130, and generates yellow light 161Y after passing through the fluorescent powder portion of the fluorescent wheel 130. In this embodiment, the color wheel 140 includes a red filter 140R, a green filter 140G, and a blue filter 140B. According to the phase of the color wheel 140, yellow light 161Y generates red light 162R after passing through the red filter 140R, and generates green light 162G after passing through the green filter 140G. The blue light 161B generates blue light 162B after passing through the blue filter 140B. In other embodiments, the color wheel 140 may include filters of three or more colors, which is not intended to limit the present disclosure.

In this embodiment, when the laser projector 100 is in the calibration state, it can use the light intensities of the red light 162R, the green light 162G, and the blue light 162B measured by the light detector 150 to find the optimal phase of the fluorescent wheel 130. And the best phase of the color wheel 140.

FIG. 2 is a flowchart of a phase correction method according to an embodiment of the disclosure. The phase correction method includes the following steps. First, in step (a), the processor generates a synchronization signal and transmits it to the laser driver. Then in step (b), the laser driver controls the switching of the laser light source according to the timing of the synchronization signal. Then, in step (c), the photodetector is used to measure the first light intensity of the laser light of the laser light source after passing through the fluorescent wheel and the color wheel in sequence. Then in step (d), the phase of the fluorescent wheel or the phase of the color wheel is changed. Then in step (e), the photodetector is used to measure the second light intensity of the laser light after passing through the fluorescent wheel and the color wheel in sequence. Then in step (f), the phase of the fluorescent wheel or the phase of the color wheel is changed again. Then, in step (g), the photodetector is used to measure the third light intensity of the laser light after passing through the fluorescent wheel and the color wheel in sequence. Then in step (h), when the second light intensity is greater than the first light intensity and the third light intensity is greater than the second light intensity, repeat steps (f) and (g), or when the second light intensity is less than the first light intensity When a light intensity and a third light intensity are greater than the first light intensity, steps (f) and (g) are repeated. In the following description, each of the above steps will be explained.

Please refer to Figure 1 and Figure 2 at the same time. In step (a), the processor 120 generates a synchronization signal 122 and transmits it to the laser driver 112, and the timing of the synchronization signal 122 is synchronized with the timing of the color wheel 140. Then in step (b), the laser driver 112 controls the switching of the laser light source 114 according to the timing of the synchronization signal 122. For example, when the calibration program needs to measure blue light, the laser driver 112 turns on the laser light source 114 during the blue light time sequence and turns off the laser light source 114 during the red and green light time sequence according to the timing of the synchronization signal 122. When the calibration procedure needs to measure green light, the laser driver 112 turns on the laser light source 114 in the green light time sequence and turns off the laser light source 114 in the blue and red light time sequence according to the timing of the synchronization signal 122.

In step (c), the light detector 150 measures the first light intensity I1 of the laser light 160 after passing through the fluorescent wheel 130 and the color wheel 140 in sequence. The light detector 150 transmits the measured information of the first light intensity I1 to the laser driver 112, and the processor 120 reads the information of the first light intensity I1 from the laser driver 112. The first light intensity I1 is an integrated value of the light intensity and time passing through the fluorescent wheel 130 and the color wheel 140 in the period of the color light to be measured. The effect of the phases of the fluorescent wheel 130 and the color wheel 140 on the first light intensity I1 will be explained in the subsequent paragraphs and drawings.

FIG. 3A is a schematic diagram of the laser light 160 passing through the fluorescent wheel 130 and the color wheel 140 according to an embodiment of the disclosure. Fig. 3B is a graph showing the relationship between the intensity of colored light and the timing in Fig. 3A. Please refer to FIG. 3A and FIG. 3B at the same time. In this embodiment, the light detector 150 measures blue light to perform phase correction of the fluorescent wheel 130 or the color wheel 140. The laser driver 112 causes the laser light source 114 to turn on and generate the laser light 160 only during the blue light timing according to the timing of the synchronization signal 122. In this embodiment, the fluorescent wheel 130 has no phase difference, and the color wheel 140 has no phase difference.

In the embodiment of FIG. 3A, the laser light 160 generates colored light 1611 after passing through the fluorescent wheel 130, and the colored light 1611 generates colored light 1621 after passing through the color wheel 140. As shown by the colored light 1611, the laser light 160 completely passes through the glass portion of the fluorescent wheel 130 to generate blue light 161B. As shown by the colored light 1621, the blue light 161B passes through the blue filter 140B and generates the blue light 162B. As shown in FIG. 3B, the intensity and time integration value of the blue light 162B measured by the light detector 150 is the blue light intensity I1621.

FIG. 3C is a schematic diagram of the laser light 160 passing through the fluorescent wheel 130 'and the color wheel 140 according to another embodiment of the present disclosure. Fig. 3D is a graph of the relationship between the intensity of colored light and the timing in Fig. 3C. Please refer to FIG. 3C and FIG. 3D at the same time. In this embodiment, the light detector 150 measures blue light to perform phase correction of the fluorescent wheel 130 'or the color wheel 140. The laser driver 112 causes the laser light source 114 to turn on and generate the laser light 160 only during the blue light timing according to the timing of the synchronization signal 122. In this embodiment, the fluorescent wheel 130 'has a phase difference, and the color wheel 140 has no phase difference.

In the embodiment shown in FIG. 3C, the laser light 160 generates colored light 1612 after passing through the fluorescent wheel 130 ', and the colored light 1612 generates colored light 1622 after passing through the color wheel 140. As shown by the colored light 1612, a portion of the laser light 160 generates blue light 161B through the glass portion of the fluorescent wheel 130 ', and another portion of the laser light 160 generates yellow light 161Y through the fluorescent portion of the fluorescent wheel 130'. As shown by the color light 1622, the blue light 161B passes through the blue filter 140B to generate blue light 162B, and the yellow light 161Y is filtered by the blue filter 140B. As shown in FIG. 3D, the intensity and time integration value of the blue light 162B measured by the light detector 150 is the blue light intensity I1622.

It can be seen from the blue light intensity I1621 and I1622 in FIG. 3B and FIG. 3D that the phase difference of the fluorescent wheel 130 'reduces the total amount of blue light 161B in the color light 1612, so the blue light intensity I1622 will be smaller than the blue light intensity I1621.

It can be seen that since the laser light 160 is generated only within the blue light timing sequence, when the fluorescent wheel 130 has no phase difference, the laser light 160 completely passes through the glass portion of the fluorescent wheel 130, and the integrated blue light intensity measured by the light detector 150 will be Relative maximum. Therefore, the optimal phase of the fluorescent wheel 130 can be obtained by finding the relative maximum of the light intensity and the time integral value measured at different phases of the fluorescent wheel 130.

FIG. 3E is a schematic diagram of the laser light 160 passing through the fluorescent wheel 130 'and the color wheel 140' according to another embodiment of the present disclosure. Fig. 3F is a graph showing the relationship between the intensity of colored light and the timing in Fig. 3E. Please refer to FIG. 3E and FIG. 3F at the same time. In this embodiment, the light detector 150 measures blue light to perform phase correction of the fluorescent wheel 130 'or the color wheel 140'. The laser driver 112 causes the laser light source 114 to turn on and generate the laser light 160 only during the blue light timing according to the timing of the synchronization signal 122. In this embodiment, the fluorescent wheel 130 'and the fluorescent wheel 130' in Fig. 3C have the same phase difference, and the color wheel 140 'has a phase difference.

In the embodiment shown in FIG. 3E, the laser light 160 generates colored light 1613 after passing through the fluorescent wheel 130 ', and the colored light 1613 generates colored light 1623 after passing through the color wheel 140'. As shown by the colored light 1613, a portion of the laser light 160 generates blue light 161B through the glass portion of the fluorescent wheel 130 ', and another portion of the laser light 160 generates yellow light 161Y through the fluorescent portion of the fluorescent wheel 130'. As shown by the colored light 1623, a portion of the blue light 161B passes through the blue filter 140B 'to generate a blue light 162B, another portion of the blue light 161B is filtered by the red filter 140R', and a yellow light 161Y is filtered by the blue filter 140B '. As shown in FIG. 3F, the integrated value of the intensity and time of the blue light 162B measured by the light detector 150 is the blue light intensity I1623.

It can be seen from the blue light intensity I1622 and I1623 in FIG. 3D and FIG. 3F that the phase difference of the color wheel 140 'reduces the total amount of blue light 162B in the color light 1623, so the blue light intensity I1623 will be smaller than the blue light intensity I1622.

It can be seen that, since the laser light 160 is generated only in the blue light sequence, when the color wheel 140 has no phase difference, the blue light 161B generated after the laser light 160 passes the fluorescent wheel 130 will completely pass through the blue filter 140B and the light detector 150. The measured blue light intensity integrated value will be a relative maximum. Therefore, the optimal phase of the color wheel 140 can be obtained by finding the relative maximum value of the light intensity and the time integral value measured at different phases of the color wheel 140.

In addition, it can be seen from the comparison between FIG. 3D and FIG. 3F that the phase difference of the fluorescent wheel 130 'does not affect the result of using the blue light intensity integration to know the optimal phase of the color wheel 140. Therefore, the order of performing phase correction on the fluorescent wheel 130 or the color wheel 140 can be freely selected.

FIG. 4A is a schematic diagram of the laser light 160 passing through the fluorescent wheel 130 and the color wheel 140 according to an embodiment of the disclosure. Fig. 4B is a graph showing the relationship between the intensity of colored light and the timing in Fig. 4A. Please refer to Figure 4A and Figure 4B at the same time. In this embodiment, the light detector 150 measures the red light 162R to perform the phase correction of the fluorescent wheel 130 or the color wheel 140. The laser driver 112 causes the laser light source 114 to turn on and generate the laser light 160 only during the red light timing according to the timing of the synchronization signal 122. In this embodiment, the fluorescent wheel 130 has no phase difference, and the color wheel 140 has no phase difference.

In the embodiment of FIG. 4A, the laser light 160 generates colored light 1614 after passing through the fluorescent wheel 130, and the colored light 1614 generates colored light 1624 after passing through the color wheel 140. As shown by the colored light 1614, the laser light 160 completely passes through the phosphor powder of the fluorescent wheel 130 to generate yellow light 161Y. As shown by the colored light 1624, the yellow light 161Y passes through the red filter 140R and generates the red light 162R. As shown in FIG. 4B, the integrated value of the intensity and time of the red light 162R measured by the light detector 150 is the red light intensity I1624.

FIG. 4C is a schematic diagram of the laser light 160 passing through the fluorescent wheel 130 and the color wheel 140 'according to another embodiment of the present disclosure. Fig. 4D is a graph showing the relationship between the intensity of colored light and the timing in Fig. 4C. Please refer to Figure 4C and Figure 4D at the same time. In this embodiment, the light detector 150 measures the red light 162R to perform phase correction of the fluorescent wheel 130 or the color wheel 140 '. The laser driver 112 causes the laser light source 114 to turn on and generate the laser light 160 only during the red light timing according to the timing of the synchronization signal 122. In this embodiment, the fluorescent wheel 130 has no phase difference, and the color wheel 140 'has a phase difference.

In the embodiment of FIG. 4C, the laser light 160 generates colored light 1615 after passing through the fluorescent wheel 130, and the colored light 1615 generates colored light 1625 after passing through the color wheel 140. As shown by the colored light 1615, the laser light 160 completely passes through the phosphor powder of the fluorescent wheel 130 to generate yellow light 161Y. As shown by the colored light 1625, a part of the yellow light 161Y passes through the red filter 140R 'to generate a red light 162R, and the other part of the yellow light 161Y is filtered by the blue filter 140B'. As shown in FIG. 4D, the intensity and time integration value of the red light 162R measured by the light detector 150 is the red light intensity I1625.

It can be seen from the red light intensity I1624 and I1625 in FIGS. 4B and 4D that the phase difference of the color wheel 140 ′ reduces the total amount of red light 162R in the color light 1625, so the red light intensity I1625 will be less than the red light Intensity I1624.

From the above embodiments of measuring blue light (see Figs. 3C to 3F) and red light (see Figs. 4A to 4D), it can be known that since the laser light 160 can be generated according to the timing of the synchronization signal 122, and the synchronization signal 122 Synchronized with the timing of the color wheel 140, and the light detector 150 can measure different color light, so the best phase of the color wheel 140 can be obtained by finding the relative maximum value of the light intensity and time integration value of the different color light. That is, the user can arbitrarily select the filter color of the color wheel 140 to perform the phase correction of the color wheel 140.

In addition, since the phase correction method is performed by comparing the relative magnitudes of the integrated values of the light intensity, even if the phase difference of the fluorescent wheel 130 or the color wheel 140 causes other colored light to be generated within the time sequence of the measured colored light, the overlapping portion of the colored light spectrum contributes (For example, a small portion of the green light spectrum overlaps with the red light spectrum) does not affect the relative size of the integrated light intensity value, and therefore does not affect the fluorescent wheel found by the phase correction method disclosed in this disclosure The best phase of 130 or the best phase of color wheel 140.

Further, a projector using a laser as a light source needs to be provided with a photodetector to provide feedback information to regulate the output power of the laser light source, and the phase correction method is to further apply the information measured by the photodetector. In this way, it is not necessary to set an additional light intensity detector outside the projector, and it is not necessary to manually determine whether the fluorescent wheel and the color wheel are in the optimal phase by using the waveform displayed by the oscilloscope. Therefore, the phase correction method disclosed in this disclosure can greatly reduce the consumption of manpower and time and reduce production costs.

Please refer to Figure 1 and Figure 2 at the same time. In step (d) of the phase correction method, when the fluorescent wheel 130 is to be calibrated, the processor 120 of the laser projector 100 controls a fluorescent wheel motor driver 132 to increase or decrease the phase of the fluorescent wheel 130. When the color wheel 140 is to be corrected, the processor 120 of the laser projector 100 controls a color wheel motor driver 142 to increase or decrease the phase of the color wheel 140. In the following paragraphs, changing the phase may refer to the above actions.

Please refer to Figure 1 and Figure 2 at the same time. In step (e) of the phase correction method, the light detector 150 measures the second light intensity I2 after the laser light 160 passes through the fluorescent wheel 130 and the color wheel 140 in order. The light detector 150 transmits the measured information of the second light intensity I2 to the laser driver 112, and the processor 120 reads the information of the second light intensity I2 from the laser driver 112,

Please refer to Figure 1 and Figure 2 at the same time. In step (f) of the phase correction method, the phase is changed again. In step (f), the processor 120 of the laser projector 100 determines a method of changing the phase according to the relative magnitude of the first light intensity I1 and the second light intensity I2. Specifically, when the first light intensity I1 is greater than the second light intensity I2, if the phase is increased in step (d), the phase is decreased in step (f), and if the phase is decreased in step (d), then The phase is increased in step (f). When the first light intensity I1 is less than the second light intensity I2, if the phase is increased in step (d), then the phase is increased in step (f), and if the phase is decreased in step (d), then in step ( f) phase reduction. In other words, if the first light intensity I1 is greater than the second light intensity I2, the change of the phase in the step (d) will cause the phase difference to become larger. Therefore, in the step (f), the phase is changed in the opposite direction. .

Please refer to Figure 1 and Figure 2 at the same time. In step (g) of the phase correction method, the light detector 150 measures a third light intensity I3 after the laser light 160 passes through the fluorescent wheel 130 and the color wheel 140 in order. The light detector 150 transmits the measured information of the third light intensity I3 to the laser driver 112, and the processor 120 reads the information of the third light intensity I3 from the laser driver 112.

Please refer to Figure 1 and Figure 2 at the same time. In step (h) of the phase correction method, when the second light intensity I2 is greater than the first light intensity I1 and the third light intensity I3 is greater than the second light intensity I2, repeat steps (f) and (g), or when When the second light intensity I2 is smaller than the first light intensity I1 and the third light intensity I3 is greater than the first light intensity I1, steps (f) and (g) are repeated. That is, when the third light intensity I3 is greater than the first light intensity I1 and the second light intensity I2, it means that the phase change direction in step (f) can make the phase difference smaller. Therefore, by maintaining the phase change direction in step (f) until the phase difference starts to increase again, the optimal phase of the fluorescent wheel 130 or the color wheel 140 can be known.

Please refer to Figure 1 and Figure 2 at the same time. In step (h) of the phase correction method, when the second light intensity I2 is greater than the first light intensity I1 and the third light intensity I3 is less than the second light intensity I2, it means that the second light intensity I2 is the fluorescent wheel 130 or the color wheel The integrated value of the light intensity measured by the light detector 150 when the 140 bits are in the optimal phase. The processor 120 changes the phase of the fluorescent wheel 130 or the color wheel 140 to the phase of the fluorescent wheel 130 or the color wheel 140 corresponding to the second light intensity I2. In addition, when the second light intensity I2 is less than the first light intensity I1 and the third light intensity I3 is less than the first light intensity I1, it means that the first light intensity I1 is when the fluorescent wheel 130 or the color wheel 140 is in the optimal phase, The integrated value of the light intensity measured by the light detector 150. The processor 120 changes the phase of the fluorescent wheel 130 or the color wheel 140 to the phase of the fluorescent wheel 130 or the color wheel 140 corresponding to the first light intensity I1.

It can be known from the above steps that the phase correction method can measure the light intensity integrated value of different color light by the light detector 150, and then automatically compare the relative magnitude of the light intensity integrated value through the processor 120 to find the phase change direction that reduces the phase difference. And repeat the operation steps of changing the phase and measuring the light intensity until the maximum integrated value of the light intensity and the corresponding optimal phase of the fluorescent wheel 130 or the color wheel 140 are found. Therefore, the phase correction method disclosed in this disclosure can greatly reduce the consumption of manpower and time, and improves the inconvenience of relying on manpower to gradually change the phase and perform light intensity measurement in the past.

FIG. 5 is a flowchart of a phase correction method for the fluorescent wheel 130 according to an embodiment of the disclosure. Please refer to Figure 1 and Figure 5 at the same time. In this embodiment, the light detector 150 measures the blue light 162B to correct the phase of the fluorescent wheel 130.

In step S11, the processor 120 generates a synchronization signal 122 and transmits it to the laser driver 112. The laser driver 112 causes the laser light source 114 to be turned on within the blue light timing and generates laser light 160, and causes the laser light source 114 to be turned off during the red or green light timing. In step S12, the light detector 150 measures the blue light intensity B1, and the processor 120 stores the measured blue light intensity B1 as the initial blue light intensity IB. In step S13, the fluorescent wheel motor driver 132 increases the phase of the fluorescent wheel 130 by 0.5 degrees. In other embodiments, the fluorescent wheel motor driver 132 can increase or decrease the phase of the fluorescent wheel 130 by different degrees. In step S14, the light detector 150 measures the blue light intensity B2, and the processor 120 stores the measured blue light intensity B2 as the current blue light intensity CB. In step S15, the processor 120 determines whether the current blue light intensity CB is greater than the initial blue light intensity IB. If the current blue light intensity CB is greater than the initial blue light intensity IB, it indicates that the current phase change direction can make the phase difference of the fluorescent wheel 130 smaller, and then execute Step S16. If the current blue light intensity CB is not greater than the initial blue light intensity IB, step S17 'is performed.

In step S16, the processor 120 uses the current blue light intensity CB as the initial blue light intensity IB. In step S17, the fluorescent wheel motor driver 132 further increases the phase of the fluorescent wheel 130 by 0.5 degrees. In step S18, the light detector 150 measures the blue light intensity B3, and the processor 120 stores the measured blue light intensity B3 as the current blue light intensity CB. In step S19, the processor 120 determines whether the current blue light intensity CB is greater than the initial blue light intensity IB. If the current blue light intensity CB is greater than the initial blue light intensity IB, which indicates that the phase difference of the fluorescent wheel 130 is still small, it returns to step S16 again. If the current blue light intensity CB is not greater than the initial blue light intensity IB, it means that the phase difference of the fluorescent wheel 130 becomes larger than the phase difference of the fluorescent wheel 130 in step S13 (this means when steps S16 to S18 have not been repeated), or The phase difference is larger than that in the previous step S17, so step S20 is performed next. In step S20, the fluorescent wheel motor driver 132 reduces the phase of the fluorescent wheel 130 by 0.5 degrees. At this time, the phase of the fluorescent wheel 130 is the optimal phase of the fluorescent wheel 130.

When step S17 'is performed for the first time, the fluorescent wheel motor driver 132 reduces the phase of the fluorescent wheel 130 by 1 degree, to avoid returning to the same phase as in step S12, resulting in the same light intensity, and repeating step S17 in the subsequent steps At this time, the phase of the fluorescent wheel 130 is reduced by 0.5 degrees by the fluorescent wheel motor driver 132. In step S18 ', the light detector 150 measures the blue light intensity B3', and the processor 120 stores the measured blue light intensity B3 'as the current blue light intensity CB. In step S19 ', the processor 120 determines whether the current blue light intensity CB is greater than the initial blue light intensity IB. If the current blue light intensity CB is greater than the initial blue light intensity IB, it means that the phase difference of the fluorescent wheel 130 is still small, and then returns to step S17' . If the current blue light intensity CB is not greater than the initial blue light intensity IB, it means that the phase difference of the fluorescent wheel 130 is greater than the phase difference of the fluorescent wheel 130 in step S12 (this means when steps S17 'to S18' have not been repeated), or It is larger than the phase difference when the previous step S17 'was performed, so the next step S20' is performed. The fluorescent wheel motor driver 132 increases the phase of the fluorescent wheel 130 by 0.5 degrees. At this time, the phase of the fluorescent wheel 130 is equal to the phase of the fluorescent wheel 130. Best phase.

FIG. 6 is a flowchart of a color wheel 140 phase correction method according to an embodiment of the disclosure. Please refer to Figure 1 and Figure 6 at the same time. In this embodiment, the light detector 150 measures the red light 162R to correct the phase of the color wheel 140. In other embodiments, the light detector 150 may select and measure different color light according to the color of the color wheel 140 to perform phase correction.

In step S21, the processor 120 generates a synchronization signal 122 and transmits it to the laser driver 112. The laser driver 112 causes the laser light source 114 to be turned on within the red light timing and generates the laser light 160, and causes the laser light source 114 to be turned off during the blue or green light timing. In step S22, the light detector 150 measures the red light intensity R1, and the processor 120 stores the measured red light intensity R1 as the initial red light intensity IR. In step S23, the color wheel motor driver 142 increases the phase of the color wheel 140 by 0.5 degrees. In other embodiments, the color wheel motor driver 142 can also increase or decrease the phase of the color wheel 140 by different degrees. In step S24, the light detector 150 measures the red light intensity R2, and the processor 120 stores the measured red light intensity R2 as the current red light intensity CR. In step S25, the processor 120 determines whether the current red light intensity CR is greater than the initial red light intensity IR. If the current red light intensity CR is greater than the initial red light intensity IR, it represents that the current phase change direction can make the phase difference of the color wheel 140 smaller. , So step S26 is performed next. If the current red light intensity CR is not greater than the initial red light intensity IR, step S27 'is performed.

In step S26, the processor 120 stores the current red light intensity CR as the initial red light intensity IR. In step S27, the color wheel motor driver 142 further increases the phase of the color wheel 140 by 0.5 degrees. In step S28, the light detector 150 measures the red light intensity R3, and the processor 120 stores the measured red light intensity R3 as the current red light intensity CR. In step S29, the processor 120 determines whether the current red light intensity CR is greater than the initial red light intensity IR. If the current red light intensity CR is greater than the initial red light intensity IR, which indicates that the phase difference of the color wheel 140 is still decreasing, it returns to Step S26. If the current red light intensity CR is not greater than the initial red light intensity IR, the phase difference of the color wheel 140 becomes larger than the phase difference of the color wheel 140 in step S24 (this means when steps S26 to S28 have not been repeated) , Or is larger than the phase difference when the previous step S27 was performed, so step S30 is performed next. In step S30, the color wheel motor driver 142 reduces the phase of the color wheel 140 by 0.5 degrees. At this time, the phase of the color wheel 140 is the optimal phase of the color wheel 140.

When step S27 'is performed for the first time, the color wheel motor driver 142 reduces the phase of the color wheel 140 by 1 degree, to avoid returning to the same phase as in step S22 and causing the same light intensity, and repeating step S27 subsequently ', The phase of the color wheel 140 is reduced by 0.5 degrees by the color wheel motor driver 142. In step S28 ', the light detector 150 measures the red light intensity R3', and the processor 120 stores the measured red light intensity R3 'as the current red light intensity CR. In step S29 ', the processor 120 determines whether the current red light intensity CR is greater than the initial red light intensity IR. If the current red light intensity CR is greater than the initial red light intensity IR, it means that the phase difference of the color wheel 140 is still getting smaller, and then returns to Go to step S27 '. If the current red light intensity CR is not greater than the initial red light intensity IR, it means that the phase difference of the color wheel 140 is greater than the phase difference of the color wheel 140 in step S22 (this means when the steps S27 'to S28' have not been repeated) Or it is larger than the phase difference when the previous step S27 'was performed, so then step S30' is performed, the color wheel motor driver 142 increases the phase of the fluorescent wheel 130 by 0.5 degrees, and the phase of the color wheel 140 at this time is the color wheel. The best phase of 140.

Although the present invention has been disclosed as above by way of example, it is not intended to limit the present invention. Any person skilled in the art can make various modifications and retouches without departing from the spirit and scope of the present invention. Therefore, the protection of the present invention The scope shall be determined by the scope of the attached patent application.

100‧‧‧laser projector

101‧‧‧shell

102‧‧‧Integral Column

103‧‧‧ relay lens

104‧‧‧Reflector

105‧‧‧Digital Micro Mirror Element

106‧‧‧ projection lens

110‧‧‧laser light source module

112‧‧‧laser driver

114‧‧‧laser light source

120‧‧‧ processor

122‧‧‧Sync signal

130, 130’‧‧‧Fluorescent wheel

132‧‧‧Fluorescent wheel motor driver

140, 140’‧‧‧ color wheel

140R‧‧‧Red filter

140G‧‧‧Green Filter

140B‧‧‧Blue Filter

142‧‧‧Color Wheel Motor Driver

150‧‧‧light detector

160‧‧‧laser light

1611, 1612, 1613, 1614, 1615, 1621, 1622, 1623, 1624, 1625

I1621, I1622, I1623‧‧‧‧ Blue light intensity

I1624, I1625‧‧‧‧Red light intensity

161B, 162B‧‧‧Blu-ray

161Y‧‧‧ Huang Guang

162R‧‧‧Red

162G‧‧‧Green

I1‧‧‧First light intensity

I2‧‧‧Second light intensity

I3‧‧‧ third light intensity

B1, B2, B3, B3’‧‧‧ Blue light intensity

R1, R2, R3, R3 ’‧‧‧ red light intensity

IB‧‧‧Initial blue light intensity

CB‧‧‧Current blue light intensity

IR‧‧‧Initial red light intensity

CR‧‧‧ Current red light intensity

(a) ~ (h) ‧‧‧‧step

S11 ~ S20, S17 ’~ S20’, S21 ~ S30, S27 ’~ S30’‧‧‧ steps

FIG. 1 is a block diagram of a laser projector according to an embodiment of the disclosure. FIG. 2 is a flowchart of a phase correction method according to an embodiment of the disclosure. FIG. 3A is a schematic diagram of laser light passing through a fluorescent wheel and a color wheel according to an embodiment of the disclosure. Fig. 3B is a graph showing the relationship between the intensity of colored light and the timing in Fig. 3A. FIG. 3C is a schematic diagram of laser light passing through a fluorescent wheel and a color wheel according to another embodiment of the present disclosure. Fig. 3D is a diagram showing the relationship between the intensity of colored light and the timing in Fig. 3C. FIG. 3E is a schematic diagram of laser light passing through a fluorescent wheel and a color wheel according to another embodiment of the disclosure. Fig. 3F is a graph showing the relationship between the intensity of colored light and the timing in Fig. 3E. FIG. 4A is a schematic diagram of laser light passing through a fluorescent wheel and a color wheel according to an embodiment of the disclosure. Fig. 4B is a graph showing the relationship between the intensity of colored light and the timing in Fig. 4A. FIG. 4C is a schematic diagram of laser light passing through a fluorescent wheel and a color wheel according to another embodiment of the present disclosure. Fig. 4D is a graph showing the relationship between the intensity of colored light and the timing in Fig. 4C. FIG. 5 is a flowchart of a phase correction method for a fluorescent wheel according to an embodiment of the disclosure. FIG. 6 is a flowchart of a color wheel phase correction method according to an embodiment of the disclosure.

Claims (18)

A phase correction method is applied to a laser projector. The phase correction method includes the following steps: (a) using a processor to generate a synchronization signal and transmitting it to a laser driver; (b) the laser driver according to the synchronization One of the signals controls the switching of a laser light source in sequence; (c) measuring a first light intensity of a laser light of the laser light source sequentially passing a fluorescent wheel and a color wheel by using a light detector; (d) Increasing or decreasing the phase of the fluorescent wheel or the phase of the color wheel; (e) measuring the second light intensity of the laser light sequentially passing through the fluorescent wheel and one of the color wheel using the light detector; (f) When the first light intensity is greater than the second light intensity and the phase of the fluorescent wheel or the phase of the color wheel is increased in step (d), decrease the phase of the fluorescent wheel or the phase of the color wheel, or When the first light intensity is greater than the second light intensity and the phase of the fluorescent wheel or the phase of the color wheel is decreased in step (d), increasing the phase of the fluorescent wheel or the phase of the color wheel, Or when the first light intensity is less than the second light intensity, and the phase of the fluorescent wheel or When the phase of the color wheel is increased in step (d), the phase of the fluorescent wheel is increased, or the phase of the color wheel is increased, or when the first light intensity is less than the second light intensity, and the phase of the fluorescent wheel or When the phase of the color wheel is decreased in step (d), the phase of the fluorescent wheel or the phase of the color wheel is reduced; (g) the laser light is used to measure the laser light sequentially passing through the fluorescent wheel and the A third light intensity behind the color wheel; and (h) when the second light intensity is greater than the first light intensity and the third light intensity is greater than the second light intensity, repeat step (f) and the step (g), or when the second light intensity is less than the first light intensity and the third light intensity is greater than the first light intensity, repeat step (f) and step (g). The phase correction method according to claim 1, wherein the step (a) further comprises: synchronizing the timing of the synchronization signal and a timing of the color wheel. The phase correction method according to claim 1, wherein the first light intensity, the second light intensity, and the third light intensity in the step (c), the step (e), and the step (g) are the The integrated value of the reading and time of the light detector. The phase correction method according to claim 1, further comprising: after the step (c), the step (e), and the step (g), the light detector changes the first light intensity, the second light The intensity and the third light intensity information are transmitted to the laser driver. The phase correction method according to claim 4, further comprising: after the step (c), the step (e), and the step (g), the processor reads the first light intensity from the laser driver, Information about the second light intensity and the third light intensity. The phase correction method according to claim 1, wherein the step (d) includes the processor controlling a color wheel motor driver to change the phase of the color wheel, and the step (f) includes the processor according to the first light intensity And the second light intensity information, controlling the color wheel motor driver to change the phase of the color wheel. The phase correction method according to claim 1, wherein the step (d) comprises the processor controlling a phosphor wheel motor driver to change the phase of the phosphor wheel, and the step (f) comprises the processor according to the first light The intensity and the second light intensity information control the fluorescent wheel motor driver to change the phase of the fluorescent wheel. The phase correction method according to claim 1, wherein the step (d) includes increasing or decreasing the phase of the color wheel or the phase of the fluorescent wheel, and the step (f) includes increasing or decreasing the phase of the color wheel or the Phase of the fluorescent wheel. The phase correction method according to claim 1, wherein the step (d) includes fixing the phase of the color wheel and increasing or decreasing the phase of the fluorescent wheel, and the step (f) includes fixing the phase of the color wheel and increasing or Reduce the phase of the phosphor wheel. The phase correction method according to claim 1, wherein in the step (d), the phase change of the fluorescent wheel is not repeated, and in the step (f), the phase change of the fluorescent wheel is not repeated. The phase correction method according to claim 1, wherein the step (d) includes fixing the phase of the fluorescent wheel and increasing or decreasing the phase of the color wheel, and the step (f) includes fixing the phase of the fluorescent wheel and increasing or Reduce the phase of the color wheel. The phase correction method according to claim 1, wherein in the step (d), there is no repetition in the change of the phase of the color wheel, and in the step (f), the change in the phase of the color wheel has no repetition. According to the phase correction method described in claim 1, the step (h) further comprises: changing the fluorescent wheel when the second light intensity is greater than the first light intensity and the third light intensity is less than the second light intensity. The phase is to the phase of the fluorescent wheel corresponding to the second light intensity or the phase of the color wheel is changed to the phase of the color wheel corresponding to the second light intensity. According to the phase correction method described in claim 1, the step (h) further includes: changing the fluorescent wheel when the second light intensity is less than the first light intensity and the third light intensity is less than the first light intensity. The phase is to the phase of the fluorescent wheel corresponding to the first light intensity or the phase of the color wheel is changed to the phase of the color wheel corresponding to the second light intensity. A laser projector includes: a laser light source module having a laser driver, the laser light source module is arranged to generate a laser light; a processor is electrically connected to the laser driver and is arranged to generate A synchronization signal is transmitted to the laser driver; a fluorescent wheel is electrically connected to the processor, and a color wheel is electrically connected to the processor, wherein the fluorescent wheel is located between the laser light source module and the color wheel. And a light detector, which is electrically connected to the laser driver, wherein the color wheel is located between the fluorescent wheel and the light detector, and the light detector is configured to detect a signal from the laser light source mode. And sequentially passing the intensity of the laser light through the fluorescent wheel and the color wheel. The laser projector according to claim 15, further comprising: a reflecting mirror, wherein the reflecting mirror is located between the color wheel and the light detector, and the light detector is located behind the reflecting mirror and facing the color. Side of the wheel. The laser projector according to claim 15 has a housing, wherein the light detector is located in the housing. The laser projector according to claim 15, further comprising: a fluorescent wheel motor driver, wherein the fluorescent wheel is electrically connected to the processor via the fluorescent wheel motor driver, and the processor is configured to control the fluorescent wheel motor driver. To change the phase of the fluorescent wheel; and a color wheel motor driver, wherein the color wheel is electrically connected to the processor via the color wheel motor driver, and the processor is set to control the color wheel motor driver to change the color wheel phase .