CN115914592A - Scanner driving method, readable storage medium and device - Google Patents
Scanner driving method, readable storage medium and device Download PDFInfo
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- CN115914592A CN115914592A CN202211185551.0A CN202211185551A CN115914592A CN 115914592 A CN115914592 A CN 115914592A CN 202211185551 A CN202211185551 A CN 202211185551A CN 115914592 A CN115914592 A CN 115914592A
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Abstract
The invention discloses a scanner driving method, a readable storage medium and a device, wherein the method comprises the following steps: detecting a current flowing through the scanner during operation of the scanner; and correcting a driving signal of the scanner according to the current flowing through the scanner. According to the scheme, any external sensor is not required to be additionally arranged, and the compensation of the change of the response characteristic of the scanner caused by the change of external conditions such as temperature and the like is realized only by detecting the driving current. Furthermore, no external sensor is required to be additionally arranged, and the device also has the technical effects of simple structure, low cost, small volume, light weight and the like.
Description
Technical Field
The present invention relates to the field of projection display, and in particular, to a scanner driving method, a readable storage medium, and an apparatus.
Background
The imaging principle of the fiber scanning display technology (FSD) is that an optical fiber is driven by an optical fiber scanner to perform a predetermined two-dimensional scanning track, a light source is modulated to output light corresponding to each pixel point of an image to be displayed, and then the light corresponding to each pixel point of the image to be displayed is projected onto a projection plane one by one through the optical fiber to form a projection picture.
The optical fiber scanner actuator part is mainly composed of piezoelectric ceramics, the piezoelectric ceramics are very sensitive to external conditions such as temperature, the polarization strength of the piezoelectric ceramics can change along with the change of factors such as temperature, and for the scanner composed of the piezoelectric ceramics, compensation needs to be carried out to the scanner to realize stable display images.
In the prior art, when the scanner is compensated, a sensor needs to be additionally added to detect a feedback signal, for example, a camera and other photoelectric devices are added to detect an image track, or a temperature sensor is added to detect the ambient temperature of the scanner.
The additional sensor for detecting the feedback signal will increase the size, power consumption and cost of the scanner module and increase the complexity of production and assembly.
Disclosure of Invention
The invention aims to provide a scanner driving method, a readable storage medium and a device, which are used for solving the technical problems that in the prior art, when a scanner is compensated, a sensor is additionally arranged to realize detection of a feedback signal, so that the size, the power consumption and the cost of a scanner module are inevitably increased, and the production and assembly complexity is increased.
In order to achieve the above object, a first aspect of embodiments of the present invention provides a scanner driving method, including: detecting a current flowing through the scanner during operation of the scanner; and correcting a driving signal of the scanner according to the current flowing through the scanner.
Optionally, modifying the driving signal of the scanner according to the current flowing through the scanner includes:
calculating the numerical relation between the current and the driving voltage of the scanner, and correcting the driving signal of the scanner according to the numerical relation; wherein the numerical relationship comprises one or more of voltage-current phase difference and voltage-current amplitude ratio; or
And calculating a current phase error between the current phase and the current phase of the scanner in the initial working state, and correcting the driving frequency of the scanner according to the current phase error.
Optionally, if the numerical relationship is a voltage-current phase difference, the correcting the driving signal of the scanner according to the voltage-current phase difference includes:
correcting the driving signal of the scanner according to the corresponding relation between the driving signal of the scanner and the voltage-current phase difference; the correspondence between the drive signal of the scanner and the voltage-current phase difference includes a correspondence between a drive voltage and the voltage-current phase difference, and a correspondence between a drive phase and the voltage-current phase difference.
Optionally, the method for obtaining a correspondence between the driving signal of the scanner and the voltage-current phase difference includes:
measuring impedance curves of the scanner under different environmental conditions, and obtaining a corresponding relation between the environmental conditions and the voltage-current phase difference under fixed driving frequency based on the impedance curves;
and obtaining the corresponding relation between the driving signal and the voltage-current phase difference based on the corresponding relation between the environmental condition and the voltage-current phase difference and the corresponding relation between the driving signal and the environmental condition.
Optionally, the scanner is a piezoelectric ceramic scanner, and measuring impedance curves of the scanner under different environmental conditions includes:
measuring impedance curves of the piezoelectric ceramic scanner under different environmental conditions by a piezoelectric ceramic impedance analyzer; wherein the environmental conditions include one or more of temperature, pressure, or contaminants.
Optionally, the method for obtaining the correspondence between the driving signal and the environmental condition includes:
under different environmental conditions, the amplitude and the phase of a driving signal of the scanner are adjusted to enable a scanned image to meet preset conditions, so that the corresponding relation between the driving voltage and the environmental conditions and the corresponding relation between the driving phase and the environmental conditions are obtained.
Optionally, the preset conditions met by the scanned image include one or more of maintaining the image amplitude at the target amplitude value and keeping the image parity line content overlapped.
Optionally, the drive signal of the scanner includes any one of a drive axis drive signal and a correction axis drive signal.
A second aspect of embodiments of the present invention provides a non-transitory computer-readable storage medium having stored thereon a computer program which, when executed by a processor, performs the steps of the method of the first aspect.
A third aspect of an embodiment of the present invention provides a scanning apparatus, including:
a scanner;
a current detection circuit and a drive voltage detection circuit connected to the scanner;
the phase discriminator is respectively connected with the current detection circuit and the driving voltage detection circuit and is used for outputting a voltage-current phase difference between the current passing through the scanner and the driving voltage of the scanner;
the processor is connected with the phase discriminator and used for correcting a driving signal of the scanner according to the voltage-current phase difference;
and the scanner driving circuit is respectively connected with the processor and the scanner and is used for driving the scanner to vibrate according to the corrected driving signal.
One or more technical solutions in the embodiments of the present invention have at least the following technical effects or advantages:
during the operation of the scanner, the current flowing through the scanner is detected, the numerical relation between the current and the driving voltage applied to the scanner is calculated, and then the driving signal of the scanner is directly corrected according to the numerical relation. According to the scheme provided by the embodiment of the invention, any external sensor is not required to be additionally arranged, and the compensation of the change of the response characteristic of the scanner caused by the change of external conditions such as temperature is realized only by detecting the driving current.
Furthermore, because no external sensor is additionally arranged, the wearable glasses are simple in structure, low in cost, small in size and light in weight, and are suitable for wearable equipment of AR (Augmented Reality) glasses, which has strict requirements on size and weight.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the description in the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without inventive labor:
FIG. 1 is a flowchart of a scanner driving method according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of an impedance curve of a scanner according to an embodiment of the present invention;
FIG. 3 is a block diagram of the control of the driving frequency provided by the embodiment of the present invention;
fig. 4 is a block diagram of a scanning device according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Since the scanner actuator is mainly composed of piezoelectric ceramics, the response characteristic of the scanner changes with the change of environmental conditions such as temperature, air pressure or pollutants, and the change of the response characteristic of the scanner is caused.
As shown in fig. 1, fig. 1 is a schematic flowchart of a scanner driving method according to an embodiment of the present invention, and the method includes the following steps.
The scheme of the embodiment of the invention realizes the compensation of the change of the response characteristic of the scanner caused by the change of external conditions such as temperature and the like by only detecting the driving current under the condition of not additionally adding any external sensor.
In a possible implementation mode, after the current flowing through the scanner is collected, the numerical relation between the current and the driving voltage of the scanner is calculated, and the driving signal of the scanner is corrected according to the numerical relation; wherein the numerical relationship comprises one or more of a voltage-current phase difference and a voltage-current amplitude ratio. Since the phase change is clearly easy to detect, the adjustment can be made only by the voltage current phase difference. In other embodiments, the adjustment may be performed by using the change of the ratio of the current amplitude to the driving voltage amplitude, or by combining the voltage-current phase difference and the voltage-current amplitude ratio.
Next, the principle of the scheme in the embodiment of the present invention will be described by taking the numerical relationship as the voltage-current phase difference and the environmental condition as the temperature.
The scanner actuator part mainly comprises piezoelectric ceramics, and the scanner converts an electric signal into vibration by utilizing the inverse piezoelectric effect of the piezoelectric ceramics, and drives the optical fiber to vibrate for image scanning. The polarization intensity of the piezoelectric ceramic changes with the change of factors such as temperature, and the like, so that the scanned image track changes. Meanwhile, the impedance curve of the piezoelectric ceramic also drifts with the temperature change. As shown in fig. 2, fig. 2 is an impedance curve of a certain electrode of a scanner (in this specification, the drawing is represented by different colors for convenience of distinction), which is measured by a piezoelectric ceramic impedance analyzer, and when the impedance curve of the scanner drifts, the phase shift value changes when the driving frequency is unchanged, that is, the phase difference between the phase of the current flowing through the scanner and the driving voltage waveform changes. Therefore, information on the temperature change can be obtained by detecting the phase difference between the drive current and the drive voltage.
Then, by measuring the impedance curves of the scanner at different temperatures, the correspondence between the driving voltage current phase difference p and the temperature T at a fixed driving frequency can be obtained, and the correspondence is expressed by the expression T = f (p).
As can be seen from fig. 2, the impedance curve and the phase curve of the piezoelectric ceramic both shift with the temperature. When driving frequencyWhen the response is constant, the amplitude and the phase of the response are changed. At different temperatures, the amplitude and phase of the drive signal of the scanner are adjusted to maintain the image amplitude unchanged, the odd-even line contents are kept coincident, and the drive voltage V can be obtained x Driving phase P x The curves were fitted to the curves for temperature T, respectively, to obtain the following two functions.
V x ＝F v (T)
P x ＝F p (T)
Since the above description has calibrated the relationship of temperature to voltage-current phase difference by measurement, the expression T = f (p) is substituted into the above function V x And P x A new driving voltage V can be obtained x And a driving phase P x The expression for the function of the voltage-current phase difference is as follows.
V x ＝F v (p)
P x ＝F p (p)
Therefore, in the embodiment of the invention, the temperature compensation can be carried out on the scanner control circuit according to the voltage and current phase difference serving as the temperature sensing signal, and the driving voltage and the driving phase can be corrected in real time. The information of temperature variation can be obtained by utilizing the voltage-current phase difference between the detected driving current and the driving voltage, compared with an external temperature sensor, the temperature is measured by adopting the characteristics of the temperature sensor, the process of heat transfer is avoided, the real-time performance of the temperature detection result is higher, and the measurement error caused by the error of the installation position of the temperature sensor is avoided.
In another possible embodiment, after the current flowing through the scanner is collected, the current phase error between the current phase and the current phase in the initial working state of the scanner is calculated, and the driving frequency of the scanner is corrected according to the current phase error.
According to the impedance curve graph, when the external condition changes within a certain range, the resonance frequency of the scanner can translate, the shape change of the frequency response curve is small, and the scanner frequency response curve can be approximately considered to only translate. Thus, as shown in FIG. 3, provided for embodiments of the present inventionControl block diagram of drive frequency, assuming scanner drive frequency F d Can acquire the current phase P of the scanner in the initial working state dst Current phase P acquired in real time during operation of the scanner as phase target value x Then according to the present current phase P x And a PID controller is adopted to adjust the driving frequency in real time, so that the response track is ensured to be stable and unchanged.
In the embodiment of the present invention, the correction axis driving signal can be corrected according to the method in the above embodiment, and will not be described in detail here.
Based on the same inventive concept, an embodiment of the present invention further provides a scanning apparatus, as shown in fig. 4, and fig. 4 is a block diagram of the scanning apparatus provided in the embodiment of the present invention. The scanning apparatus includes a scanner 401; a current detection circuit 402 and a drive voltage detection circuit 403 connected to the scanner; a phase detector 404 connected to the current detection circuit 402 and the driving voltage detection circuit 403, respectively, and configured to output a voltage-current phase difference between a current flowing through the scanner and a driving voltage of the scanner; a processor 405 connected to the phase detector 404, the processor being configured to perform compensation calculation according to the voltage-current phase difference, and modify a driving signal of the scanner; and a scanner driving circuit 406 respectively connected to the processor 405 and the scanner 401, and configured to drive the scanner 401 to vibrate according to the modified driving signal.
With regard to the scanning device in the above-described embodiment, the specific manner in which each part performs the operation has been described in detail in the embodiment related to the method, and will not be elaborated upon here.
In another exemplary embodiment, there is also provided a computer readable storage medium including program instructions, which when executed by a processor, implement the steps of the above-described scanner driving method. For example, the computer readable storage medium may be the above-mentioned memory including program instructions executable by the processor to perform the above-mentioned scanner driving method.
All of the features disclosed in this specification, or all of the steps in any method or process so disclosed, may be combined in any combination, except combinations of features and/or steps that are mutually exclusive.
Any feature disclosed in this specification (including any accompanying claims, abstract and drawings), may be replaced by alternative features serving equivalent or similar purposes, unless expressly stated otherwise. That is, unless expressly stated otherwise, each feature is only an example of a generic series of equivalent or similar features.
The invention is not limited to the foregoing embodiments. The invention extends to any novel feature or any novel combination of features disclosed in this specification and any novel method or process steps or any novel combination of features disclosed.
Claims (10)
1. A scanner driving method, comprising:
detecting a current flowing through the scanner during operation of the scanner;
and correcting a driving signal of the scanner according to the current flowing through the scanner.
2. The method of claim 1, wherein modifying the drive signal of the scanner based on the current flowing through the scanner comprises:
calculating the numerical relation between the current and the driving voltage of the scanner, and correcting the driving signal of the scanner according to the numerical relation; the numerical relation comprises one or more of voltage-current phase difference and voltage-current amplitude ratio; or
And calculating a current phase error between the current phase and the current phase of the scanner in the initial working state, and correcting the driving frequency of the scanner according to the current phase error.
3. The method of claim 2, wherein the numerical relationship is a voltage-current phase difference, and modifying the driving signal of the scanner according to the voltage-current phase difference comprises:
correcting the driving signal of the scanner according to the corresponding relation between the driving signal of the scanner and the voltage-current phase difference; the correspondence between the drive signal of the scanner and the voltage-current phase difference includes a correspondence between a drive voltage and the voltage-current phase difference, and a correspondence between a drive phase and the voltage-current phase difference.
4. The method of claim 3, wherein obtaining a correspondence between a drive signal of the scanner and the voltage-current phase difference comprises:
measuring impedance curves of the scanner under different environmental conditions, and obtaining a corresponding relation between the environmental conditions and the voltage-current phase difference under fixed driving frequency based on the impedance curves;
and obtaining the corresponding relation between the driving signal and the voltage-current phase difference based on the corresponding relation between the environmental condition and the voltage-current phase difference and the corresponding relation between the driving signal and the environmental condition.
5. The method of claim 4, wherein the scanner is a piezo ceramic scanner and measuring an impedance profile of the scanner under different environmental conditions comprises:
measuring impedance curves of the piezoelectric ceramic scanner under different environmental conditions by a piezoelectric ceramic impedance analyzer; wherein the environmental conditions include one or more of temperature, pressure, or contaminants.
6. The method of claim 4, wherein obtaining the correspondence between the drive signal and the environmental condition comprises:
under different environmental conditions, the amplitude and the phase of a driving signal of the scanner are adjusted, so that a scanned image meets a preset condition, and the corresponding relation between the driving voltage and the environmental conditions and the corresponding relation between the driving phase and the environmental conditions are obtained.
7. The method of claim 6, wherein the preset conditions satisfied by the scanned image include one or more of maintaining the image amplitude constant at the target amplitude value, and keeping the image parity line content coincident.
8. The method of claim 1, wherein the drive signal of the scanner comprises any one of a drive axis drive signal and a corrective axis drive signal.
9. A non-transitory computer readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the method according to any one of claims 1 to 8.
10. A scanning device, comprising:
a scanner;
a current detection circuit and a drive voltage detection circuit connected to the scanner;
the phase discriminator is respectively connected with the current detection circuit and the driving voltage detection circuit and is used for outputting a voltage-current phase difference between the current passing through the scanner and the driving voltage of the scanner;
the processor is connected with the phase discriminator and used for correcting a driving signal of the scanner according to the voltage and current phase difference;
and the scanner driving circuit is respectively connected with the processor and the scanner and is used for driving the scanner to vibrate according to the corrected driving signal.
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| CN202211185551.0A CN115914592A (en) | 2022-09-27 | 2022-09-27 | Scanner driving method, readable storage medium and device |
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| CN202211185551.0A CN115914592A (en) | 2022-09-27 | 2022-09-27 | Scanner driving method, readable storage medium and device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117723527A (en) * | 2024-02-08 | 2024-03-19 | 杭州柔谷科技有限公司 | Optimized control method of oxygen partial pressure sensor, electronic equipment and storage medium |
| CN117723527B (en) * | 2024-02-08 | 2024-05-14 | 杭州柔谷科技有限公司 | Optimized control method of oxygen partial pressure sensor, electronic equipment and storage medium |
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2022
- 2022-09-27 CN CN202211185551.0A patent/CN115914592A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117723527A (en) * | 2024-02-08 | 2024-03-19 | 杭州柔谷科技有限公司 | Optimized control method of oxygen partial pressure sensor, electronic equipment and storage medium |
| CN117723527B (en) * | 2024-02-08 | 2024-05-14 | 杭州柔谷科技有限公司 | Optimized control method of oxygen partial pressure sensor, electronic equipment and storage medium |
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