KR20100013843A - Apparatus and method for driving light scanner - Google Patents

Abstract

PURPOSE: A driving device of an optical scanner and a driving method thereof are provided to effectively conduct a zoom function by controlling the amplification of a driving signal according to a difference between a reference angle value and a real angle value by an optical scanner. CONSTITUTION: A driving signal generator(17) generates a driving signal. An optical scanner(11) is driven with the driving signal. A sensing unit(13) senses a driving angle of the optical scanner. A driving signal amplification controller(15) sets a reference value of the driving angles of the optical scanner according to an external input signal. The driving signal amplification controller controls the amplification of the driving signal according to a difference between a reference voltage corresponding to the predefined reference value and the voltage of the sensing signal. A reference value setting unit sets a reference value of the driving angles of the optical scanner according to an external input signal.

Description

Apparatus and method for driving light scanner}

The present invention relates to an apparatus for driving an optical scanner for scanning an image on a screen, and more particularly to an apparatus and method for driving an optical scanner capable of adjusting the size of an image displayed.

In general, along with the rapid advancement into the multimedia society, large-sized and high-definition display screens are required, and in recent years, in addition to high resolution, the implementation of natural natural colors is important.

In order to achieve perfect natural colors, it is necessary to use a light source with high color purity, such as a laser. One of the devices for implementing an image using a laser is a laser projection display device using an optical scanner.

Such a laser projection display apparatus implements an image by scanning light generated from a laser light source onto a screen using an optical scanner.

Here, the optical scanner implements an image by scanning the incident light according to the driving signal in a horizontal direction and a vertical direction of the screen.

In order to realize a high resolution image, the optical scanner needs to have a high driving speed. The high speed of the optical scanner means that the driving angle of the optical scanner must be large.

In the optical scanner, when the driving signal is a specific frequency, the driving angle tends to be large. The specific frequency of the driving signal that increases the driving angle of the optical scanner is called a resonance frequency.

Therefore, when the driving signal corresponds to the resonant frequency, the optical scanner has the largest driving angle and enables high speed driving.

Laser projection display devices using such optical scanners are gradually miniaturized to be applied to portable devices.

There are many technical difficulties in miniaturizing a laser projection display device using an optical scanner, and among them, there are technical difficulties in adding a zoom function for reducing or enlarging the size of a displayed image.

Therefore, in order to miniaturize the laser projection display apparatus using the optical scanner, instead of moving the projection lens and adjusting the size of the displayed image, as in a general display apparatus, only the driving angle of the optical scanner is adjusted to adjust the image. It should be able to scale up or down.

Therefore, in order to adjust the driving angle of the optical scanner, development of a driving system and a method capable of amplifying or reducing the driving signal applied to the optical scanner is currently under study. Without the necessity, only a small amount of signal processing will realize a compact laser projection display apparatus having a zoom function for reducing or enlarging the size of the displayed image.

An object of the present invention is to solve these problems, by setting a reference angle value for the drive angle of the optical scanner, by controlling the amplification of the drive signal in accordance with the difference between the reference angle value and the actual angle value of the sensed optical scanner In addition, the present invention provides an optical scanner driving apparatus and method capable of simply and compactly implementing a zoom function for reducing or enlarging the size of a displayed image.

In accordance with another aspect of the present invention, an optical scanner driving apparatus includes a driving signal generation unit generating a driving signal, an optical scanner driven by the driving signal, a sensing unit sensing a driving angle of the optical scanner, and an optical scanner according to an external input signal. And a driving signal amplifying controller configured to set a reference value for the driving angle of and control the amplification of the driving signal according to a difference value between the reference voltage corresponding to the set reference value and the voltage of the sensed sensing signal.

Here, the driving signal amplifying control unit may include a reference value setting unit for setting a reference value for the driving angle of the optical scanner according to an external input signal, a reference voltage generator for generating a reference voltage corresponding to the set reference value, the generated reference voltage and And a controller configured to calculate a difference value with respect to the voltage of the sensing signal sensed by the sensor, and a controller to control amplification of the drive signal generated by the drive signal generator according to the difference value of the calculator.

The calculator may include a first calculator configured to calculate a difference between a reference voltage of the horizontal sync signal among the reference voltages and a voltage of the horizontal sync signal among the sensing signals, and a vertical sync signal among the reference voltages and the sensing signals of the vertical sync signals among the reference voltages. The second calculator may be configured to calculate a difference value with respect to a voltage of V, a third calculator to integrate the value calculated from the first calculator, and a fourth calculator to integrate the value calculated from the second calculator.

Subsequently, the driving signal generation unit includes a memory unit for storing vertical and horizontal synchronization signals for an external image, a gain adjusting unit for adjusting gain of vertical and horizontal synchronization signals stored in the memory unit according to a control signal of the controller, and a gain adjustment A digital-to-analog converter for converting the vertical and horizontal synchronization signals into an analog signal, a filter unit for removing a high frequency component of the analog signal to generate a drive signal, and a driver for driving the optical scanner by the generated drive signal Can be configured.

In accordance with another aspect of the present invention, a method of driving an optical scanner includes: receiving a signal for adjusting an image size, setting a reference value for a driving angle of an optical scanner corresponding to the received signal, and corresponding to a set reference value Generating a reference voltage, sensing a current driving angle of the optical scanner, calculating a difference value between the generated reference voltage and the voltage of the sensed signal, and applying the calculated difference value to the optical scanner Controlling the amplification of the drive signal.

Other objects, features and advantages of the invention will become apparent from the following detailed description of embodiments taken in conjunction with the accompanying drawings.

The optical scanner driving apparatus and method according to the present invention has the following effects.

The present invention sets the reference angle value for the driving angle of the optical scanner, and controls the amplification of the driving signal according to the difference between the reference angle value and the actual angle value of the sensed optical scanner, thereby reducing or enlarging the size of the displayed image. The zoom function can be performed simply and effectively.

In addition, since the present invention can perform the zoom function simply and simply by processing the driving signal without performing the zoom function by the projection method of the projection lens, it is possible to implement a microminiature since no mechanical means for moving the projection lens is required. It works.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram showing a driving device of an optical scanner according to the present invention.

As shown in FIG. 1, the present invention is largely composed of an optical scanner 11, a sensing unit 13, a driving signal amplifying control unit 15, and a driving signal generating unit 17.

Here, the optical scanner 11 is a MEMS (micro-electro-mechenical system) scanner, which is driven by resonance by a drive signal shifted by 90 degrees.

In addition, the sensing unit 13 senses a current driving angle of the optical scanner 11.

Subsequently, the driving signal amplifying control unit 15 sets a reference value for the driving angle of the optical scanner 11 according to the external input signal, and sets the reference value corresponding to the set reference value to the difference value between the reference voltage corresponding to the set reference value and the voltage of the sensed sensing signal. Accordingly, it serves to control the amplification of the drive signal generated by the drive signal generator 17.

FIG. 2 is a block diagram illustrating the driving signal amplifying controller of FIG. 1, and as shown in FIG. 2, the reference value setting unit 510, the reference voltage generator 501, the operation units 503 and 507, and a sampler are illustrated. ) 505 and the controller 509, and may further include a memory 520 in some cases.

Here, the reference value setting unit 510 sets a reference value for the driving angle of the optical scanner according to the external input signal.

The external input signal is a user input signal for adjusting the size of an image, and the reference value setting unit 510 obtains the size information of the image to be adjusted from the external input signal, and stores the reference value for the size information of the corresponding image in the memory unit ( 520).

The memory unit 520 stores a plurality of reference voltage values for the driving angle of the optical scanner according to the size of the scanned image.

In some cases, the memory unit 520 may be designed exclusively in the driving signal amplifying control unit 15, or may be designed so that the memory unit of the driving signal generating unit 17 may be commonly used.

In this case, in order to reduce the size of the overall driving device, it is more preferable to use the memory part of the drive signal generator 17 in common.

As described above, the reference value setting unit 510 extracts information about the driving angle of the optical scanner, the driving voltage value for the driving angle of the optical scanner, etc. from the memory unit 520, and the desired reference value from the extracted information. Can be set.

Subsequently, the reference voltage generator 501 generates a reference voltage corresponding to the set reference value.

Here, the reference voltage generator 501 may include a first reference voltage generator 501a for generating a reference voltage for the horizontal synchronization signal, and a second reference voltage generator 501b for generating a reference voltage for the vertical synchronization signal. It can be configured as.

The calculation units 503 and 507 calculate a difference between the generated reference voltage and the voltage of the sensing signal sensed by the sensing unit 13.

Here, the calculators 503 and 507 are composed of first, second, third, and fourth calculators 503a, 503b, 507a, and 507b. The first calculator 503a includes a first reference voltage generator 501a. The difference value between the reference voltage of the horizontal synchronous signal generated from and the voltage of the horizontal synchronous signal among the sensing signals sensed by the sensing unit 13 is calculated.

The second calculator 503b calculates a difference value between the reference voltage of the vertical synchronization signal generated by the second reference voltage generator 501b and the voltage of the vertical synchronization signal among the sensing signals sensed by the sensing unit 13. .

Subsequently, the first and second samplers 505a and 505b store the difference values of the first calculator 503a, and the third and fourth samplers 505c and 505d store the difference values of the second calculator 503b.

Next, the third operation unit 507a integrates the operation values stored in the first and second samplers 505a and 505b, and the fourth operation unit 507b operates the operation values stored in the third and fourth samplers 505c and 505d. Integrate

Then, the controller 509 controls the gain adjusting unit of the drive signal generator 17 according to the integrated value to control the amplification of the drive signal.

Meanwhile, the driving signal generator 17 generates a driving signal by using horizontal and vertical synchronization signals of the image signal.

FIG. 3 is a block diagram illustrating the driving signal generator of FIG. 1. As shown in FIG. 3, the driving signal generator includes first and second memory units 302a and 302b and first and second digital-to-analog conversions. The parts 304a and 304b, the first and second filter parts 306a and 306b, the first and second driving parts 308a and 308b, and the gain adjusting part 309 may be included.

Here, the first and second memory units 302a and 302b are a look up table and store horizontal and vertical synchronization signals.

In some cases, the first and second memory units 302a and 302b may store a plurality of reference voltage values for the driving angle of the optical scanner according to the size of the scanned image.

The first memory unit 302a stores data related to the horizontal synchronization signal for the video signal, and the second memory unit 302b stores data related to the vertical synchronization signal for the video signal.

Next, the first and second digital-to-analog converters 304a and 304b convert the signals stored in the first and second memory units 302a and 302b into digital to analog signals, and the first and second filter units ( 306a and 306b are low pass filters, which generate a driving signal by removing high frequency components of an analog signal.

The first and second drivers 308a and 308b drive the optical scanner by the generated drive signal.

In addition, the gain adjusting unit 309 adjusts gain of horizontal and vertical synchronization signals stored in the first and second memory units 302a and 302b according to a control signal input from the driving signal amplifying control unit 15. Play a role.

Although not shown in FIG. 1, the present invention may further include a reference signal generator and a phase delay compensator.

The reference signal generator detects a phase difference between the driving signal generated by the driving signal generator 17 and the sensing signal sensed by the sensing unit 13 that senses the driving of the optical scanner to generate a reference signal.

The reference signal generator may include a noise remover, a frequency adjuster, and a sync signal adjuster.

Here, the noise removing unit removes noise of the sensing signal sensed by the sensing unit 13, and the frequency adjusting unit adjusts the phase difference between the sensing signal from which the noise is removed and the driving signal of the driving signal generator 17. The clock frequency is fixed by adjusting the clock frequency.

As such, the reason for fixing the phase difference between the driving signal and the sensing signal by 90 degrees through the frequency adjusting unit is the horizontal sensing of the optical scanner 11 serving as a comparison signal with the horizontal driving signal of the driving signal generator 17 serving as a reference signal. This is because the optical scanner 11 has a maximum Q factor value when the phase difference of the signal becomes 90 degrees.

Therefore, in order for the optical scanner 11 to drive at the optimum angle, the phase difference must be fixed at 90 degrees.

Next, the synchronizing signal adjusting unit may serve to adjust vertical and horizontal synchronizing signals with respect to the input external image signal by using the adjusted clock frequency as the pixel clock.

The phase delay compensator detects a phase delay between the reference signal generated by the reference signal generator and the sensing signal passed through the noise remover to compensate for the phase delay.

Accordingly, the drive signal generator 17 according to the present invention may generate a drive signal using horizontal and vertical synchronous signals compensated for phase delay.

As described above, the driving method of the optical scanner driving apparatus according to the present invention is as follows.

4 is a flowchart illustrating a method of driving an optical scanner according to the present invention. As shown in FIG. 4, first, the reference value setting unit 510 of the driving signal amplification controller 15 adjusts the size of an image from the outside. Receive a signal to perform (S10).

Subsequently, when a signal for adjusting the size of the image is received, the reference value setting unit 510 of the driving signal amplifying control unit 15 receives the driving angle of the optical scanner and the driving angle of the optical scanner from the memory unit 520. Information about the driving voltage and the like is extracted, and a desired reference value is set from the extracted information (S20).

The reference voltage generator 505 generates a reference voltage corresponding to the set reference value (S30).

Next, the first and second calculators 503a and 503b calculate a difference value between the voltage of the sensing signal and the generated reference voltage with respect to the current driving angle of the optical scanner from the sensing unit 13 (S40).

Here, the first calculation unit 503a calculates a difference value between the reference voltage of the horizontal synchronization signal and the voltage of the horizontal synchronization signal among the sensing signals, and the second calculation unit 503b performs the vertical synchronization of the reference voltage and the sensing signal of the vertical synchronization signal. Compute the difference value for the voltage of the signal.

Subsequently, the calculated difference value is stored in the sampler 505 and then integrated by the third and fourth calculation units 503c and 503d.

Then, the controller 509 controls the gain adjusting unit 309 of the drive signal generator 17 to adjust amplification of the drive signal applied to the optical scanner according to the calculated difference value (S50).

That is, when the memory unit 302 of the driving signal generator 17 stores the vertical and horizontal synchronization signals for the external image, the gain adjusting unit 309 adjusts the magnitude of the signal according to the control signal of the controller 509. Adjust the gain of the stored vertical and horizontal sync signals as much as possible.

The digital-to-analog converter 304 converts the gain-adjusted signal from digital to an analog signal, and the filter unit 306 generates a drive signal by removing high frequency components of the analog signal, and then drives the drive unit 308. By driving the optical scanner with the generated driving signal, it is possible to adjust the size of the displayed image by adjusting the driving angle of the optical scanner.

FIG. 5 is a waveform diagram illustrating a method of driving an optical scanner according to the present invention. As shown in FIG. 5, when an optical scanner is driven by receiving a driving signal generated according to a reference value B, the optical scanner is driven. The image displayed to the outside by the has a predetermined size.

If the user applies an external input signal to the driving signal amplifying control unit to enlarge the size of the image, the driving signal amplifying control unit adjusts the reference value B to the reference value A and the driving signal generating unit amplifies according to the adjusted reference value A. The generated driving signal is generated to drive the optical scanner.

Therefore, the optical scanner is driven by the amplified drive signal, whereby the size of the image displayed on the outside is further enlarged.

As described above, the present invention sets the reference angle value for the driving angle of the optical scanner, and controls the amplification of the driving signal according to the difference between the reference angle value and the actual angle value of the sensed optical scanner, thereby increasing the size of the displayed image. The zoom function to reduce or enlarge can be performed simply and effectively.

In addition, since the present invention can perform the zoom function simply and simply by processing the driving signal without performing the zoom function by the projection method of the projection lens, it is possible to implement a microminiature since no mechanical means for moving the projection lens is required. It works.

Those skilled in the art will appreciate that various changes and modifications can be made without departing from the spirit of the present invention. Therefore, the technical scope of the present invention should not be limited to the contents described in the embodiments, but should be defined by the claims.

1 is a block diagram showing a driving device of an optical scanner according to the present invention;

FIG. 2 is a block diagram illustrating a driving signal amplifying controller of FIG. 1.

3 is a block diagram illustrating a driving signal generator of FIG. 1;

4 is a flowchart illustrating a method of driving an optical scanner according to the present invention.

5 is a waveform diagram illustrating a method of driving an optical scanner according to the present invention;

Claims (10)

In the drive of the optical scanner for scanning an image on the screen, A drive signal generator for generating a drive signal; An optical scanner driven by the drive signal; A sensing unit configured to sense a driving angle of the optical scanner; And, A reference value for a driving angle of the optical scanner is set according to an external input signal, and driving for controlling amplification of the driving signal according to a difference value between a reference voltage corresponding to the set reference value and a voltage of the sensed sensing signal Optical scanner driving apparatus comprising a signal amplification control unit. The method of claim 1, wherein the driving signal amplification control unit, A reference value setting unit for setting a reference value for the driving angle of the optical scanner according to the external input signal; A reference voltage generator configured to generate a reference voltage corresponding to the set reference value; A calculating unit calculating a difference value between the generated reference voltage and the voltage of the sensing signal sensed by the sensing unit; And a controller for controlling amplification of a drive signal generated by the drive signal generator in accordance with the difference value of the calculator. The optical scanner driving apparatus of claim 2, further comprising a memory unit configured to store a plurality of reference values for a driving angle of the optical scanner according to the size of the scanned image. The apparatus of claim 3, wherein the reference value setting unit extracts a reference value corresponding to the external input signal from the memory unit. The apparatus of claim 4, wherein the external input signal is a signal for adjusting the size of an image. The method of claim 2, wherein the calculation unit, A first calculator configured to calculate a difference between a reference voltage of the horizontal synchronous signal among the reference voltages and a voltage of the horizontal synchronous signal among the sensing signals; A second calculator configured to calculate a difference value between a reference voltage of the vertical synchronization signal among the reference voltages and a voltage of the vertical synchronization signal among the sensing signals; A third calculating unit for integrating the value calculated from the first calculating unit; And a fourth calculating unit for integrating the value calculated from the second calculating unit. The method of claim 2, wherein the driving signal generation unit, A memory unit for storing vertical and horizontal synchronization signals for an external image; A gain adjusting unit adjusting gains of vertical and horizontal synchronization signals stored in the memory unit according to a control signal of the controller; A digital-to-analog converter for converting the gain-adjusted vertical and horizontal synchronization signals into analog signals; A filter unit generating a driving signal by removing high frequency components of the analog signal; And a driving unit for driving the optical scanner by the generated driving signal. In the driving method of the optical scanner for scanning an image on the screen, Receiving a signal for adjusting the size of an image; Setting a reference value for the driving angle of the optical scanner corresponding to the received signal; Generating a reference voltage corresponding to the set reference value; Sensing a current driving angle of the optical scanner; Calculating a difference value between the generated reference voltage and the voltage of the sensed sensing signal; And controlling the amplification of the driving signal applied to the optical scanner according to the calculated difference value. The method of claim 8, wherein calculating a difference value between the generated reference voltage and the voltage of the sensed sensing signal comprises: Calculate a difference value between the reference voltage of the horizontal synchronous signal among the reference voltages and the voltage of the horizontal synchronous signal among the sensing signals, and the difference value between the reference voltage of the vertical synchronization signal among the reference voltages and the voltage of the vertical synchronization signal among the sensing signals. Making; And integrating the calculated difference value. The method of claim 8, wherein the controlling of the amplification of the driving signal applied to the optical scanner according to the calculated difference value comprises: Storing vertical and horizontal synchronization signals for an external image; Adjusting gains of the stored vertical and horizontal synchronization signals according to the calculated difference values; Converting the gain-adjusted vertical and horizontal synchronous signals into analog signals; Generating a driving signal by removing a high frequency component of the analog signal; And driving the optical scanner by the generated driving signal.

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