TW202008036A - Phase calibration method and laser projector - Google Patents

Abstract

A phase calibration method includes the following steps: (a) producing a synchronization signal and transferring the synchronization signal to a laser driver; (b) controlling switches of a laser light source based on a time series of the synchronization signal; (c) measuring a first light intensity of the light sequentially passing through a phosphor wheel and a color wheel; (d) changing a phase of the phosphor wheel or a phase of the color wheel; (e) measuring a second light intensity of the light sequentially passing through the phosphor wheel and the color wheel; (f) changing the phase of the phosphor wheel or the phase of the color wheel again; (g) measuring a third light intensity of the light sequentially passing through the phosphor wheel and the color wheel; (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 step (g); and when the second light intensity is smaller than the first light intensity, and the third light intensity is greater than the first light intensity, repeat step (f) and step (g).

Description

Phase correction method and laser projector

The invention relates to a phase correction method and a laser projector, in particular to a phase correction method of a fluorescent wheel and a color wheel and a laser projector.

In the conventional laser projector phase correction method, it is necessary to set up a light detector in front of the projector and connect the light detector to the oscilloscope. Then manually adjust the phase of the fluorescent wheel or the color wheel step by step, and find the best phase of the fluorescent wheel or the color wheel according to whether the waveform of the oscilloscope is square.

Therefore, the conventional laser projector phase correction method not only depends on manpower, but also requires more time and equipment cost. 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 the present 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 after the laser light of the laser light source passes through the fluorescent wheel and the color wheel in sequence is measured with 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 second light intensity after the laser light passes through the fluorescent wheel and the color wheel in sequence is measured with a light detector. Then in step (f), the phase of the fluorescent wheel or the color wheel is changed again. Then in step (g), the third light intensity after the laser light passes through the fluorescent wheel and the color wheel in sequence is measured with a light detector. 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 When a light intensity is greater than the first light intensity, repeat steps (f) and (g).

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, second light intensity and third light intensity in step (c), step (e) and step (g) of the phase correction method are read by the light detector The integral value of time and value.

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

In some embodiments of the present disclosure, in step (c), step (e) and step (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 Strength information.

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 color wheel phase.

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 fluorescent wheel motor driver to change the phase of the fluorescent 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 phase of the color wheel, and 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 change of the phase of the color wheel is not repeated, and in step (f), the change of the phase of the color wheel is not repeated.

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

Another technical aspect of the present 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 configured 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, wherein the fluorescent wheel is located between the laser light source module and the color wheel. The light detector and the laser driver are electrically connected, wherein the color wheel is located between the fluorescent wheel and the light detector, and the light detector is set to detect the laser light source module and sequentially pass through the fluorescent wheel and the color wheel 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 the side of the reflector that faces 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 present disclosure, the laser projector further includes 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 . The laser projector further 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-mentioned embodiments of the present disclosure, since the phase correction method and the laser projector of the present disclosure can generate laser light according to the timing of the synchronization signal, the light intensity is measured by the light detector, and then the phase and measurement are repeatedly changed by the processor The operation steps of light intensity until the relative maximum value of the integrated value of light intensity is found. Therefore, the phase correction method and laser projector of the present disclosure do not need to install an additional light intensity detector outside the projector, nor need to manually determine whether the fluorescent wheel and the color wheel are in the optimal phase by the waveform displayed by the oscilloscope . In this way, the manpower and time consumption can be greatly reduced and the production cost can be reduced, which improves the inconvenience of relying on manpower to gradually change the phase and perform light intensity measurement in the past.

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

FIG. 1 is a block diagram of a laser projector 100 according to an embodiment of the present 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 has 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 the 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 the intensity of various colored lights generated by the laser light 160 after sequentially passing through the fluorescent wheel 130 and the color wheel 140 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 mirror 104, a digital micromirror device 105 (Digital Micromirror Device, DMD), and a projection lens 106. The light 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 reflecting mirror 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 approximately 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 reflecting mirror 104 after passing through the fluorescent wheel 130 and the color wheel 140.

In addition, the laser projector 100 further includes a fluorescent wheel motor driver 132 and a color wheel motor driver 142. The fluorescent wheel 130 is electrically connected to the processor 120 via the 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 via 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 phosphor 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, the 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 more than three colors, and is not intended to limit the disclosure.

In this embodiment, when the laser projector 100 is in the calibration state, the light intensity of the red light 162R, the green light 162G, and the blue light 162B respectively measured by the light detector 150 can be used 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 present 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. Next, in step (c), the first light intensity after the laser light of the laser light source passes 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 second light intensity after the laser light passes through the fluorescent wheel and the color wheel in sequence is measured with a light detector. Then in step (f), the phase of the fluorescent wheel or the color wheel is changed again. Then in step (g), the third light intensity after the laser light passes through the fluorescent wheel and the color wheel in sequence is measured with a light detector. 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 When a light intensity is greater than the first light intensity, repeat steps (f) and (g). In the following description, 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 process needs to measure blue light, the laser driver 112 turns on the laser light source 114 in the blue light timing according to the timing of the synchronization signal 122, and turns off the laser light source 114 in the red and green light timing. When the calibration process needs to measure green light, the laser driver 112 turns on the laser light source 114 within the green light timing according to the timing of the synchronization signal 122, and turns off the laser light source 114 during the blue and red light timing.

In step (c), the light detector 150 measures the first light intensity I1 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 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 the integrated value of the light intensity and time passing through the fluorescent wheel 130 and the color wheel 140 during the period of colored light to be measured. The influence of the phase of the fluorescent wheel 130 and the color wheel 140 on the first light intensity I1 will be described in 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 present disclosure. FIG. 3B is a diagram of the relationship between the intensity of colored light and the timing in FIG. 3A. Please refer to FIGS. 3A and 3B at the same time. In this embodiment, the light detector 150 measures blue light to perform the phase correction of the fluorescent wheel 130 or the color wheel 140. According to the timing of the synchronization signal 122, the laser driver 112 turns on the laser light source 114 only within the blue light timing and generates the laser light 160. In this embodiment, the fluorescent wheel 130 has no phase difference, and the color wheel 140 has no phase difference.

In the embodiment shown in FIG. 3A, the laser light 160 passes through the fluorescent wheel 130 to generate colored light 1611, and the colored light 1611 passes through the color wheel 140 to generate colored light 1621. 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 completely passes through the blue filter 140B to generate blue light 162B. As shown in FIG. 3B, the light detector 150 measures the intensity and time integral of the blue light 162B as 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. Figure 3D is a diagram of the relationship between the intensity of colored light and timing in Figure 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 the phase correction of the fluorescent wheel 130' or the color wheel 140. According to the timing of the synchronization signal 122, the laser driver 112 turns on the laser light source 114 only within the blue light timing and generates the laser light 160. In this embodiment, the fluorescent wheel 130' has a phase difference, while the color wheel 140 has no phase difference.

In the embodiment of FIG. 3C, the laser light 160 passes through the fluorescent wheel 130' to generate colored light 1612, and the colored light 1612 passes through the color wheel 140 to generate colored light 1622. 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 phosphor portion of the fluorescent wheel 130'. As shown by the colored light 1622, the blue light 161B completely passes 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 light detector 150 measures the intensity and time integral of the blue light 162B as the blue light intensity I1622.

It can be seen from the blue light intensities I1621 and I1622 in FIGS. 3B and 3D that the phase difference of the fluorescent wheel 130' reduces the total amount of blue light 161B in the colored 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, 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 value of the 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 value of the measured light intensity and the time integral value 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 yet another embodiment of the present disclosure. FIG. 3F is a diagram of the relationship between the intensity of colored light and the timing in FIG. 3E. Please refer to FIGS. 3E and 3F at the same time. In this embodiment, the light detector 150 measures blue light to perform the phase correction of the fluorescent wheel 130' or the color wheel 140'. According to the timing of the synchronization signal 122, the laser driver 112 turns on the laser light source 114 only within the blue light timing and generates the laser light 160. In this embodiment, the fluorescent wheel 130' has the same phase difference as the fluorescent wheel 130' in FIG. 3C, and the color wheel 140' has a phase difference.

In the embodiment shown in FIG. 3E, the laser light 160 passes through the fluorescent wheel 130' to produce colored light 1613, and the colored light 1613 passes through the color wheel 140' to produce colored light 1623. 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 phosphor portion of the fluorescent wheel 130'. As shown by the colored light 1623, a part of the blue light 161B passes through the blue filter 140B' to generate blue light 162B, another part of the blue light 161B is filtered by the red filter 140R', and the yellow light 161Y is filtered by the blue filter 140B'. As shown in FIG. 3F, the light detector 150 measures the intensity and time integral of the blue light 162B as the blue light intensity I1623.

As can be seen from the blue light intensities I1622 and I1623 in Figures 3D and 3F, 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 less than the blue light intensity I1622.

It can be seen that since the laser light 160 is only generated within the blue light timing, when the color wheel 140 has no phase difference, the blue light 161B generated after the laser light 160 passes through the fluorescent wheel 130 will completely pass through the blue filter 140B, and the light detector 150 The measured integral value of blue light intensity 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 measured light intensity and the time integration value at different phases of the color wheel 140.

In addition, as can be seen from the comparison between the 3D image and the 3F image, the phase difference of the fluorescent wheel 130' does not affect the result of knowing the optimal phase of the color wheel 140 using the blue light intensity integration. Therefore, the order of performing the 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 present disclosure. FIG. 4B is a diagram of 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. According to the timing of the synchronization signal 122, the laser driver 112 turns on the laser light source 114 only during the red light timing and generates the laser light 160. In this embodiment, the fluorescent wheel 130 has no phase difference, and the color wheel 140 has no phase difference.

In the embodiment shown in 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 portion of the phosphor wheel 130 to generate yellow light 161Y. As shown by the colored light 1624, the yellow light 161Y completely passes through the red filter 140R to generate red light 162R. As shown in FIG. 4B, the light detector 150 measures the intensity and time integral of the red light 162R as 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 relationship diagram of colored light intensity and time sequence 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 the phase correction of the fluorescent wheel 130 or the color wheel 140'. According to the timing of the synchronization signal 122, the laser driver 112 turns on the laser light source 114 only during the red light timing and generates the laser light 160. 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 passes through the fluorescent wheel 130 to generate colored light 1615, and the colored light 1615 passes through the color wheel 140 to generate colored light 1625. As shown by the colored light 1615, the laser light 160 completely passes through the phosphor portion of the fluorescent wheel 130 to generate yellow light 161Y. As shown by the colored light 1625, part of the yellow light 161Y passes through the red filter 140R' to generate 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 light detector 150 measures the intensity and time integral of the red light 162R as the red light intensity I1625.

It can be seen from the red light intensity I1624 and I1625 in Figures 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.

It can be known from the above embodiments that respectively measure blue light (see FIGS. 3C to 3F) and red light (see FIGS. 4A to 4D), since the laser light 160 can be generated according to the timing of the synchronization signal 122, and the synchronization signal 122 The timing of the color wheel 140 is synchronized, and the light detector 150 can measure different colored lights. Therefore, the optimal phase of the color wheel 140 can be known by finding the relative maximum value of the light intensity of different colored lights and the time integration value. In other words, 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 timing of the measured colored light, the overlapping portion of the colored light spectrum contributes The intensity of the light (for example, there will be a small part of the band in the green light spectrum overlapping with the red light spectrum) does not affect the relative size between the integrated values of the light intensity, 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 light detector 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 light detector. In this way, there is no need to install an additional light intensity detector outside the projector, and there is no need to manually determine whether the fluorescent wheel and the color wheel are in the optimal phase by 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 the production cost.

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 corrected, 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 subsequent paragraphs, changing the phase can refer to the actions described above.

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 sequence. 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 the method of changing the phase according to the relative magnitudes 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 reduced in step (d), then Increase the phase 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), the phase is increased in step (f), and if the phase is decreased in step (d), then in step (d) f) Reduce the phase. In other words, if the first light intensity I1 is greater than the second light intensity I2, it means that the phase change direction in step (d) will make the phase difference larger, so in 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 the third light intensity I3 after the laser light 160 passes through the fluorescent wheel 130 and the color wheel 140 in sequence. 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 less than the first light intensity I1, and the third light intensity I3 is greater than the first light intensity I1, repeat step (f) and step (g). In other words, 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, 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 color wheel 140 to the phase of the fluorescent wheel 130 or color wheel 140 corresponding to the first light intensity I1.

As can be seen from the above steps, the phase correction method can measure the light intensity integrated values of different colored lights by the light detector 150, and then automatically compare the relative magnitudes of the light intensity integrated values through the processor 120 to find the direction of phase change 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 the present 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.

FIG. 5 is a flowchart of the phase correction method of the fluorescent wheel 130 according to an embodiment of the present disclosure. Please refer to Figure 1 and Figure 5 at the same time. In this embodiment, the light detector 150 measures 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 turns on the laser light source 114 in the blue light timing and generates the laser light 160, and turns off the laser light source 114 in 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 also 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 means 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 executed.

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, it means that the phase difference of the fluorescent wheel 130 is still decreasing, and then 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 are not repeated), or The phase difference is greater than when the step S17 was executed the previous time, so the step S20 is executed next. In step S20, the fluorescent wheel motor driver 132 reduces the phase of the fluorescent wheel 130 by 0.5 degrees. The phase of the fluorescent wheel 130 at this time is the optimal phase of the fluorescent wheel 130.

When performing step S17' for the first time, the fluorescent wheel motor driver 132 reduces the phase of the fluorescent wheel 130 by 1 degree, avoiding returning to the same phase as in step S12 and generating a situation where the intensity of light is equal, and repeating step S17 in the subsequent steps ', the fluorescent wheel motor driver 132 reduces 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, it means that the phase difference of the fluorescent wheel 130 is still decreasing, 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 step S17' to step S18' are not repeated), or The phase difference is greater than the previous time when step S17' was performed, so next step S20' is performed, and 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 the same as that of the fluorescent wheel 130. The best phase.

FIG. 6 is a flowchart of a color wheel 140 phase correction method according to an embodiment of the present 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 colors of 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 turns on the laser light source 114 in the red light timing and generates the laser light 160, and turns off the laser light source 114 in 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 means that the current phase change direction can make the phase difference of the color wheel 140 smaller , So step S26 follows next. If the current red light intensity CR is not greater than the initial red light intensity IR, step S27' is executed.

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, it means that the phase difference of the color wheel 140 is still decreasing, and then returns to Step S26. 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 becomes larger than the phase difference of the color wheel 140 in step S24 (this means when steps S26 to S28 are not repeated) Or, the phase difference is greater than when the step S27 was executed the previous time, so the step S30 is executed 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 executed for the first time, the color wheel motor driver 142 reduces the phase of the color wheel 140 by 1 degree, avoiding returning to the same phase as in step S22 and producing a situation where the light intensity is equal, and repeating step S27 in the subsequent steps ', the color wheel motor driver 142 reduces 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, it means that the phase difference of the color wheel 140 is still decreasing, and then returns 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 step S27' to step S28' are not repeated) Or, the phase difference is greater than when the previous step S27' was executed, so the next step S30' is executed, 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 the embodiments, it is not intended to limit the present invention. Anyone who is familiar with this skill can make various modifications and retouching without departing from the spirit and scope of the present invention, so the protection of the present invention The scope shall be as defined in the appended patent application scope.

100‧‧‧Laser projector 101‧‧‧Case 102‧‧‧Integral column 103‧‧‧Relay lens 104‧‧‧Reflector 105‧‧‧Digital miniature mirror element 106‧‧‧Projection lens 110‧ ‧‧Laser light source module 112‧‧‧Laser driver 114‧‧‧Laser light source 120‧‧‧Processor 122‧‧‧Synchronization 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‧‧‧ color light I1621, I1622, I1623‧‧‧ blue light intensity I1624, I1625‧‧‧ red light intensity 161B, 162B ‧‧‧Blue light 161Y‧‧‧Yellow light 162R‧‧‧Red light 162G‧‧‧Green light 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)‧‧‧Steps 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 present disclosure. FIG. 2 is a flowchart of a phase correction method according to an embodiment of the present 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 present disclosure. FIG. 3B is a diagram of 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 relationship diagram of colored light intensity and time sequence in FIG. 3C. FIG. 3E is a schematic diagram of laser light passing through a fluorescent wheel and a color wheel according to yet another embodiment of the present disclosure. FIG. 3F is a diagram of 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 present disclosure. FIG. 4B is a diagram of 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 relationship diagram of colored light intensity and time sequence in FIG. 4C. FIG. 5 is a flowchart of a fluorescent wheel phase correction method according to an embodiment of the present disclosure. FIG. 6 is a flowchart of a color wheel phase correction method according to an embodiment of the present disclosure.

(a)~(h)‧‧‧step

Claims (18)

A phase correction method is applied to a laser projector. The phase correction method includes the following steps: (a) A processor generates a synchronization signal and transmits it to a laser driver; (b) The laser driver uses the synchronization One of the signals controls the switching of a laser light source in time sequence; (c) uses a light detector to measure the first light intensity of a laser light of the laser light source after sequentially passing through a fluorescent wheel and a color wheel; (d) Change the phase of the fluorescent wheel or the phase of the color wheel; (e) use the photodetector to measure the second light intensity of the laser light passing through the fluorescent wheel and the color wheel in sequence; (f) change again The phase of the fluorescent wheel or the phase of the color wheel; (g) using the light detector to measure the third light intensity of the laser light passing through the fluorescent wheel and the color wheel in sequence; and (h) when the 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 the step (f) and the step (g), or when the second light intensity is less than the first light When the third light intensity is greater than the first light intensity, repeat the step (f) and the 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 of the light detector and the time. The phase correction method according to claim 1, further comprising: after the step (c), the step (e) and the step (g), the light detector applies the first light intensity and the second light The information of the intensity and the third light intensity is 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 information of the second light intensity, the color wheel motor driver is controlled to change the phase of the color wheel. The phase correction method according to claim 1, wherein the step (d) includes the processor controlling a fluorescent wheel motor driver to change the phase of the fluorescent wheel, and the step (f) includes the processor according to the first light The information of the intensity and the second light intensity controls 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 The phase of the fluorescent wheel. The phase correction method according to claim 1, wherein in step (d) 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 Reduce the phase of the fluorescent 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 in 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), the change of the phase of the color wheel is not repeated, and in the step (f), the change of the phase of the color wheel is not repeated. According to the phase correction method of claim 1, the step (h) further includes: 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 of the fluorescent wheel corresponding to the second light intensity or changing the phase of the color wheel to the phase of the color wheel corresponding to the second light intensity. According to the phase correction method of 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 of the fluorescent wheel corresponding to the first light intensity or changing the phase of the color wheel to the phase of the color wheel corresponding to the second light intensity. A laser projector includes: a laser light source module with a laser driver configured to generate a laser light; a processor electrically connected to the laser driver and configured to generate A synchronous signal is transmitted to the laser driver; a fluorescent wheel electrically connected to the processor, a color wheel 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 electrically connected to the laser driver, wherein the color wheel is located between the fluorescent wheel and the light detector, the light detector is set to detect the laser light source mode The intensity of the laser light passing through the fluorescent wheel and the color wheel is sequentially set. The laser projector according to claim 14, further comprising: a reflector, wherein the reflector is located between the color wheel and the light detector, and the light detector is located opposite the reflector The side of the wheel. The laser projector according to claim 14, has a housing, wherein the light detector is located in the housing. The laser projector according to claim 14, further comprising: 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; and a color wheel motor driver, wherein the color wheel is electrically connected to the processor through 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 .

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