KR101591830B1 - laser display system and method for driving the same - Google Patents

Abstract

A distance measuring unit for measuring a distance to a screen; a light amount determining unit for determining a laser light amount according to the measured distance; and a light amount determining unit for determining a light amount An optical scanner for scanning the output laser light to display an image on a screen, a distance measuring unit and a light amount determining unit, And a control unit for controlling the power supply unit according to the determined amount of laser light.

 Laser light source, light scanner, light amount determination unit, distance sensor

Description

[0001] The present invention relates to a laser display system and a driving method thereof,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laser display system, and more particularly, to a laser display system and a driving method thereof capable of adjusting a light amount according to a distance.

In general, in addition to a rapid transition to a multimedia society, a large display screen and a high image quality are required, and in recent years, the implementation of a natural color in addition to a high resolution has become important.

In order to realize a perfect natural color, it is necessary to use a light source with high color purity such as a laser. One of the systems for implementing an image using a laser is a laser display system using a light scanner.

A laser display system such as a laser projector and a laser projection system displays an image by projecting an input image signal on a screen using laser light emitted from a laser light source. The system is mainly used for presentations of a conference room, A projector, a home theater of a home, and the like.

The laser display system using a general optical scanner may include a laser light source, an optical modulator, an optical system, a light scanner, an image controller, and the like.

Here, the laser light source includes a red laser for generating red light, a green laser for generating green light, and a blue laser for generating blue light.

The laser light source emits the generated laser light to the optical modulator. The optical modulator modulates the incident laser light according to the image control signal of the image controller to generate the diffracted light and emits it to the optical system.

The generated diffracted light is transmitted to the optical scanner through the optical system. The optical scanner scans the light while the mirrors rotate at a predetermined angle according to the mirror control signal of the image control unit, and displays the image.

An object of the present invention is to provide a laser display system and a method of driving the same that can prevent saturation of an image and reduce power consumption by automatically adjusting a laser light amount according to a distance using a distance sensor.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are not intended to limit the invention to the precise forms disclosed. .

A laser display system according to the present invention includes a distance measuring unit for measuring a distance to a screen, a light amount determining unit for determining an amount of laser light according to a measured distance, a power source for generating a power source corresponding to the determined amount of laser light, A distance measuring unit and a light amount determining unit; and a control unit for controlling the power unit according to the determined amount of laser light, wherein the control unit controls the distance measuring unit and the light amount determining unit to scan the output laser light, And a control unit for controlling the display unit.

Here, the light amount determination unit may include a storage unit for storing the laser light amount value according to the distance in advance, a comparison unit for comparing whether the measured distance exceeds a predetermined threshold distance, and a comparison unit for comparing the measured A light quantity value detector for detecting a light quantity value of the laser light output from the laser light source; and a comparator for comparing the laser light quantity value searched from the search unit and the laser light quantity value detected from the light quantity detecting unit, And calculating a final laser light amount value.

The light amount determining unit may include a storage unit for storing the light amount value for the distance and the light amount value for the average gray value in advance and storing the current frame of the image, and a comparison unit for comparing whether the measured distance exceeds a predetermined threshold distance. A search unit for searching a light amount value according to a distance measured from the storage unit according to a comparison result of the comparison unit, a tone value extracting unit for extracting a tone value for each pixel of the stored current frame, A light quantity value extracting section for extracting a light quantity value with respect to an average gray-scale value, a light quantity value extracting section for extracting a light quantity value extracted from the light quantity value extracting section and a light quantity And calculating a final light amount value by comparing and calculating the values of the light amount value.

The light quantity determining unit may include a storage unit for storing the light quantity value corresponding to the distance and the light quantity value corresponding to the distance in advance and storing a current frame of the image, and a comparison unit for comparing whether the measured distance exceeds a predetermined threshold distance A gradation value extracting unit for extracting a gradation value for each pixel of the stored current frame, a gradation value extracting unit for gradating a gradation value between adjacent pixels, A light quantity flag value counter for counting the number of light quantity flags respectively corresponding to the gradation deviation value; and a light quantity quantity counter for counting the quantity of light A light quantity value extracting unit for extracting a light quantity value corresponding to the number of flags, a light quantity value extracting unit for extracting the light quantity value extracted from the light quantity value extracting unit and the light quantity value searched from the search unit And calculating a final light amount value by comparing and calculating the calculated light amount value.

According to another aspect of the present invention, there is provided a method of driving a laser display system, including the steps of measuring a distance to a screen, comparing a measured distance with a predetermined threshold distance, and comparing the measured distance with a predetermined threshold distance Determining the amount of laser light according to the measured distance, and displaying the image on the screen by driving the laser light source and the light scanner so as to correspond to the determined amount of laser light.

The step of determining the amount of laser light includes the steps of searching for a laser light amount value according to the measured distance and detecting a light amount value of the laser light output from the laser light source and comparing the detected laser light amount value and the detected laser light amount value And computing the final laser light amount value.

The step of determining the amount of laser light includes the steps of searching for a light amount value according to the measured distance and extracting a light amount value of the average gray-level value for the current frame of the image, comparing the extracted light amount value with the searched light amount value And computing the final laser light amount value.

Other objects, features and advantages of the present invention will become apparent from the detailed description of embodiments with reference to the accompanying drawings.

The laser display system and the driving method thereof according to the present invention have the following effects.

The present invention uses a distance sensor to automatically adjust the amount of laser light according to the distance, thereby preventing saturation and glare of an image in which the image becomes excessively bright, thereby protecting the eyes of the viewer.

In addition, since the amount of laser light is automatically adjusted according to the distance, the present invention can reduce power consumption.

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

BACKGROUND OF THE INVENTION 1. Field of the Invention [0002] The present invention relates to a laser projector used in a portable device or the like, and mainly a light emitting diode or a laser diode is mainly used as a light source.

The light sources are composed of red, green, and blue light sources, respectively, and represent colors. The image can be expressed using a scanning mirror moving in the vertical and horizontal directions according to the applied driving voltage and current.

Generally, such a portable laser projector is driven with a constant brightness irrespective of the distance from the screen. When the projector is driven at a constant brightness, when the distance from the screen is short, the image is displayed too bright, When exposed to this person's eyes, a fatal hazard may occur.

Therefore, the present invention proposes a method of preventing the image saturation by automatically adjusting the amount of light according to the distance using a distance sensor, and protecting the eyes by detecting the irradiation of an excessively large area.

1, the present invention includes a light source 11, a light scanner 19, a collimator 13, a color synthesizer 15, a mirror (not shown) 17).

Here, the light source 11 is composed of a red laser light source 11a for generating red light, a green laser light source 11b for generating green light, and a blue laser light source 11c for generating blue light.

The first collimator 13a is located in front of the red laser light source 11a and the second collimator 13b is located in front of the green laser light source 11b and the third collimator 13b is located in front of the blue laser light source 11c. The collimator 13c can be positioned.

Here, the collimator 13 can perform a role of having a minimum spot size on the screen by making the laser light close to parallel or substantially parallel.

The color synthesizer 15 synthesizes the red light, the green light and the blue light on a single optical path and the mirror 17 is disposed between the color synthesizer 15 and the optical scanner 19 in order to facilitate the light- Can be deployed.

Further, although not shown, a drive control unit for driving the light source 11 and the optical scanner 19 may be further included.

FIG. 2 is a view showing a light source of FIG. 1 and a drive control unit for driving the optical scanner.

2, the driving control unit may include a distance measuring unit 100, a light amount determining unit 200, a power supply unit 300, and a control unit 400.

The distance measuring unit 100 measures the distance to the screen. The distance measuring unit 100 may include a distance sensor 110 and a distance detector 120.

At this time, the distance sensor unit 110 senses the distance to the screen, and an infrared sensor, a laser sensor, an ultrasonic sensor, or the like can be used.

In the present invention, in order to simplify the system configuration, a laser sensor using a laser light source can be used.

The distance detecting unit 120 detects a distance value corresponding to the sensing signal sensed by the distance sensor unit 110.

Then, the light amount determining unit 200 determines the amount of laser light according to the distance measured by the distance measuring unit 100.

The light amount determining unit 200 of the present invention can determine the amount of laser light by searching the information table in which the laser light amount value according to the distance is set in advance.

That is, the present invention can adjust the light amount according to the distance from the screen by referring to the information table related to the light amount value corresponding to the distance.

In this method, the image can be displayed according to the determined amount of light by measuring the distance to the screen automatically at any time before / after the image is displayed.

However, in the present invention, the amount of light can be determined by three other methods in addition to the above-described method.

In the following embodiments, the image is displayed first, and then the distance to the screen is measured to adjust the present light amount appropriately.

3 is a view showing a light amount determining unit according to the first embodiment.

3, the light amount determination unit 200 includes a storage unit 210, a comparison unit 220, a search unit 230, a light amount value detection unit 240, and a light amount value calculation unit 250 Lt; / RTI >

Here, the storage unit 210 may preset and store the laser light quantity value according to the distance.

The comparing unit 220 may compare the measured distance from the distance measuring unit 100 to a predetermined threshold distance.

Here, the threshold distance is set in advance because the closer the projector is to the screen, the smaller the amount of light to protect the viewer's eyes. If the projector is too close to the screen, the amount of light is greatly reduced and the screen becomes too dark, It is because there is not.

Therefore, in the present invention, the critical distance is set, and when the distance from the screen is too close, the laser light source can be turned off.

The search unit 230 searches for a laser light amount corresponding to the distance measured from the storage unit 210 according to the comparison result of the comparison unit 220 that the measured distance exceeds the critical distance .

Then, the light amount value detector 240 detects the light amount value of the laser light output from the present laser light source.

Then, the light amount value calculating unit 250 can calculate the final laser light amount value by comparing and calculating the laser light amount value searched from the search unit 230 and the laser light amount value detected from the light amount detecting unit 240. [

That is, the light amount determining unit of the first embodiment detects the light amount value of the laser light output from the present laser light source and compares the detected light amount value with the light amount value according to the predetermined distance to determine the final light amount value.

For example, if the light amount value detected by the light amount value detecting unit 240 is larger than the light amount value searched from the search unit 230, the light amount of the laser light is reduced by reducing the power supply to the laser light source, If the detected light amount value is smaller than the searched light amount value from the search unit 230, the power supply to the laser light source can be increased to increase the light amount of the laser light.

4 is a view showing a light amount determining unit according to the second embodiment.

4, the light amount determination unit 200 includes a storage unit 210, a comparison unit 220, a search unit 230, a tone value extraction unit 260, a tone value calculation unit 270, A value extracting unit 280, and a light amount value calculating unit 250. [

Here, the storage unit 210 may store and store the light amount value for the distance value and the average gray value according to the distance, and may store the current frame of the video signal received by the control unit 400 .

Then, the comparator 220 compares the measured distance with a predetermined threshold distance.

Then, the search unit 230 can search the light amount value according to the distance measured from the storage unit 210, according to the comparison result in which the measured distance exceeds the predetermined threshold distance.

Then, the gray level value extracting unit 260 extracts a gray level value for each pixel of the current frame stored in the storage unit 210. [

That is, the tone value extracting unit 260 extracts all the tone information of each pixel included in the video data of the current frame.

The tone value arithmetic unit 270 can calculate the average tone value for the current frame using the extracted tone value.

That is, the tone value calculator 270 calculates an average tone value for one frame by using the tone value extracted from all the pixels for one frame.

The light amount value extraction unit 280 extracts the light amount value for the average gray value from the storage unit 210 through a preset information table and the light amount value calculation unit 250 extracts the light amount value from the light amount value extraction unit 280 The final light amount value can be calculated by referring to the light amount value and the light amount value searched from the search unit 230. [

That is, the light amount determining unit of the second embodiment obtains the average tone value for the current frame, detects the light amount value corresponding to the average tone value, refers to the light amount value detected at this time and the light amount value according to the predetermined distance, Is a method of determining a value.

Therefore, the light amount determining unit of the second embodiment determines the final light amount value in consideration of the average gray value of the current frame, instead of determining the final light amount value by considering only the current light amount of the laser light source as in the first embodiment. The brightness of the image can be adjusted more precisely than the one embodiment.

That is, the second embodiment refers to the average gray-level value of the current frame, and determines whether the brightness of the image corresponding to the predetermined distance And the value of the light amount is finally determined by adjusting the value once more.

In other words, if it is determined that the currently displayed image is an image that does not require a high luminance like a moving image by referring to the average gradation value of the current frame, the light amount value according to the predetermined distance is determined to be a lower value, And the luminance can be lowered, so that the power consumption can be further reduced as compared with the first embodiment.

5 is a view showing a light amount determining unit according to the third embodiment.

5, the light amount determination unit 200 includes a storage unit 210, a comparison unit 220, a search unit 230, a gray level value extraction unit 260, a gray level deviation value calculation unit 290, A light quantity flag value generator 320, a light quantity flag counter 330, a light quantity value extracting unit 280, and a light quantity value calculating unit 250. [

Here, the storage unit 210 may store and store a light amount value corresponding to the distance and the number of light amount flags according to the distance, and may store the current frame of the image signal received by the control unit 400. [

Then, the comparator 220 compares the measured distance with a predetermined threshold distance.

Then, the search unit 230 can search for the light amount value according to the distance measured from the storage unit 210, according to the comparison result that the measured distance exceeds the predetermined threshold distance.

Next, the gray-level value extracting unit 260 extracts gray-level values for each pixel of the current frame stored in the storage unit 210.

That is, the tone value extracting unit 260 extracts all the tone information of each pixel included in the video data of the current frame.

Next, the gradation deviation value calculator 290 calculates the gradation deviation between adjacent pixels using the gradation values extracted from all the pixels for one frame.

For example, if the tone value of one pixel can be realized from 1 to 255, the tone deviation value between adjacent pixels can be from 244 to at least 1.

Thus, when the gradation deviation values from 1 to 244 are obtained, the light amount flag generation section 320 generates a brightness flag for each gradation deviation value.

For example, a gradation deviation value corresponding to 1 to 122 generates a luminance flag of 0, and a gradation deviation value corresponding to 123 to 244 produces a luminance flag of 1.

In some cases, the luminance flags can be further subdivided, such as 1 - 50.

Then, when the light amount flag number counter 330 counts the number of luminance flags of the corresponding frame, the light amount value extracting unit 280 extracts the light amount value corresponding to the counted number of luminance flags.

That is, if the number of luminance flags for 1 is 100, for example, the light amount value extracting unit 280 can extract the light amount value corresponding thereto by referring to the light amount information table set in advance in the storage unit 210. [

Next, the light amount value computing unit 250 can calculate the final light amount value by referring to the light amount value extracted from the light amount value extracting unit 280 and the light amount value searched from the search unit 230.

Therefore, instead of determining the final light amount value by considering the average gray-level value of the current frame as in the second embodiment, the light-amount determining unit of the third embodiment may calculate the final light amount value in consideration of the gray- The brightness of the image can be adjusted more precisely than in the second embodiment.

In other words, the third embodiment refers to the gradation deviation value between adjacent pixels, and determines whether or not the intensity of light corresponding to a predetermined distance And the value of the light amount is finally determined by adjusting the value once more.

In other words, if it is determined that the image currently displayed is an image that does not require a high luminance as in a moving picture, the light amount value is determined to be a value lower than a predetermined distance by referring to the gradation deviation value between adjacent pixels , The luminance can be lowered, so that the power consumption can be further reduced as compared with the first embodiment.

A more detailed description thereof will be described later.

2, the power supply unit 300 generates a power supply corresponding to the amount of laser light determined by the light amount determination unit 200, according to a control signal of the control unit 400. As shown in FIG.

The laser light source receives the generated power and outputs the laser light. The optical scanner scans the laser light output from the laser light source according to the control signal of the controller 400, and displays the image on the screen.

Next, the control unit 400 controls the distance measuring unit 100 and the light amount determining unit 200, and controls the power supply unit 300 according to the determined amount of laser light.

6, the control unit 400 includes a synchronization signal adjustment unit 410, a drive signal generation unit 420, a video signal processing unit 430, a control signal generation unit 420, (440). ≪ / RTI >

At this time, the synchronization signal adjustment unit 410 adjusts the horizontal and vertical synchronization signals of the received video signal.

The driving signal generating unit 420 generates a driving signal for controlling the driving of the optical scanner according to the adjusted synchronizing signal and the video signal processing unit 430 outputs the received video signal according to the adjusted synchronizing signal And performs signal processing.

The control signal generator 440 generates a first control signal for controlling the power supply unit 300 so that the laser light source is driven according to the signal processed video signal and outputs the first control signal to the distance measuring unit 100 and the light amount determining unit 200, and generates a third control signal for controlling the power supply unit 300 according to the determined amount of laser light.

The driving method of the laser display system according to the present invention will now be described.

7, according to the control signal of the controller 400, the distance sensor unit 110 calculates the distance from the screen to the screen according to the control signal of the controller 400, And the distance detector 120 measures a distance to the screen by detecting a distance value corresponding to the sensed sensing signal.

The comparing unit 220 of the light amount determining unit 200 compares the distance measured by the distance measuring unit 100 with a predetermined threshold distance.

If the measured distance exceeds the predetermined threshold distance, the search unit 230 refers to the information table stored in the storage unit 210 and determines a search amount and a light amount value of the laser light amount according to the measured distance. (S30)

However, if the measured distance does not exceed the predetermined threshold distance as a result of the comparison, the controller 400 turns off the laser light source and ends the process (S50)

This is because the closer the projector is to the screen, the smaller the amount of light to protect the viewer's eyes. If the projector is too close to the screen below the critical distance, the amount of light is greatly reduced and the screen becomes too dark to distinguish the images.

Therefore, in the present invention, the critical distance is set, and when the distance from the screen is too close, the laser light source can be turned off.

Next, the controller 400 may display the image on the screen by driving the laser light source and the optical scanner so as to correspond to the determined amount of laser light. (S40)

That is, the synchronization signal adjustment unit 410 of the control unit 400 receives the video data of the video signal and the vertical / horizontal synchronization data, and adjusts the horizontal and vertical synchronization signals of the received video signal.

The drive signal generator 420 of the controller 400 generates a drive signal of the optical scanner according to the adjusted synchronization signal to drive the optical scanner.

The video signal processor 430 of the controller 400 processes the video signal according to the adjusted synchronization signal and the control signal generator 440 receives the video signal processed by the video signal processor 430 And receives the laser light amount information data determined from the light amount determining unit 200 and controls the power supply unit 300 so as to correspond thereto.

The power supply unit 300 generates a power source corresponding to the determined amount of laser light according to the control signal of the controller 400 and supplies the power to the laser light source so that the amount of laser light is adjusted according to the distance to the screen to display the image on the screen .

Here, the control signal generator 440 generates three control signals. The first control signal controls the power source unit 300 so that the laser light source is driven according to the processed video signal regardless of the distance measurement And the second control signal is a signal for controlling the distance measuring unit 100 and the light amount determining unit 200 in order to measure the distance to the screen and determine the light amount value corresponding thereto, And controls the power supply unit 300 so that the power supply is supplied to the laser light source in accordance with the determined amount of laser light.

Meanwhile, in the laser display system of the present invention, the method of determining the amount of light can be performed by the following method in addition to the above method.

These methods are methods for increasing or decreasing the amount of light by referring to the current light amount after measuring the distance from the screen after the image is displayed on the screen.

3, the search unit 230 refers to the light amount related information table of the storage unit 210, searches for the laser light amount value according to the measured distance, and then the light amount value detection unit 240 And detects the current light amount value of the laser light output from the laser light source.

Then, the light amount value calculating unit 250 compares the searched laser light amount value with the detected laser light amount value, and calculates the final laser light amount value.

If the light amount value detected by the light amount value detecting unit 240 is larger than the light amount value searched from the search unit 230, the light amount of the laser light is reduced by reducing the power supply to the laser light source, If the light amount value is smaller than the searched light amount value from the search unit 230, the power supply to the laser light source can be increased to increase the light amount of the laser light.

That is, in the first method, the light amount value of the laser light output from the present laser light source is detected, and the light amount value detected at this time is compared with the light amount value according to the predetermined distance to determine the final light amount value.

In the second method, the search unit 230 refers to the light amount related information table of the storage unit 210 and searches for the laser light amount value according to the measured distance. Then, the tone value extraction unit 260 extracts the gray- And extracts the light amount value of the average gray-level value for the current frame of the image stored in the memory.

That is, the tone value extracting unit 260 extracts all the tone information of each pixel included in the video data of the current frame.

Next, the tone value arithmetic unit 270 calculates an average tone value for the current frame using the extracted tone value.

That is, the tone value calculator 270 calculates an average tone value for one frame by using the tone value extracted from all the pixels for one frame.

Next, the light amount value extracting unit 280 searches and extracts the light amount value corresponding to the obtained average tone value through a preset light amount information table.

Then, the light amount value calculating unit 250 calculates the final laser light amount value by referring to the extracted light amount value and the searched light amount value.

That is, the second method refers to the average gray-level value of the current frame, and determines whether the brightness value of the image corresponding to the preset distance And finally determines the light amount value.

In other words, if it is determined that the currently displayed image is an image that does not require a high luminance like a moving image by referring to the average gradation value of the current frame, the light amount value according to the predetermined distance is determined to be a lower value The luminance can be lowered, so that the power consumption can be further reduced as compared with the first method.

On the other hand, the third method is similar to the second method in that the gradation deviation value between the pixels is more finely used.

First, the search unit 230 searches the light amount related information table of the storage unit 210 to search for the laser light amount value according to the measured distance, and then the tone value extraction unit 260 extracts the tone value stored in the storage unit 210 The light amount value of the average gray-level value for the current frame of the frame is extracted.

That is, the tone value extracting unit 260 extracts all the tone information of each pixel included in the video data of the current frame.

Next, the gradation deviation value calculating section 290 calculates a gradation deviation value between adjacent pixels.

That is, the gray-level deviation value calculator 290 calculates the gray-level deviation between adjacent pixels using the gray-level values extracted from all the pixels for one frame.

As described above, if the gray scale value of one pixel can be implemented from 1 to 255, the gray scale deviation value between adjacent pixels can be displayed from a maximum of 244 to a minimum of 1.

Thus, when the gradation deviation values from 1 to 244 are obtained, the light amount flag generation section 320 generates the light amount flags for the respective gradation deviation values.

For example, a gradation deviation value corresponding to 1 to 122 generates a light amount flag of 0, and a gradation deviation value corresponding to 123 - 244 generates a light amount flag of 1.

Then, the light amount flag number counter 330 counts the number of light amount flags of the corresponding frame.

Then, the light amount value extracting unit 280 extracts a light amount value corresponding to the counted number of light amount flags.

For example, when the number of light quantity flags for 1 is 100, the light quantity value extracting unit 280 can extract a light quantity value corresponding thereto by referring to a preset light quantity information table.

Then, the light amount value calculating unit 250 calculates the final laser light amount value by referring to the extracted light amount value and the searched light amount value.

That is, the third method refers to a gradation deviation value between adjacent pixels, and determines a light amount value according to a predetermined distance according to an image that does not require high brightness such as a moving image or an image that requires high brightness such as a still image So that the light amount value is finally determined.

In other words, if it is determined that the image currently displayed is an image that does not require a high luminance as in a moving picture, the light amount value is determined to be a value lower than a predetermined distance by referring to the gradation deviation value between adjacent pixels , The brightness can be lowered, so that the power consumption can be further reduced as compared with the first method.

FIG. 8 is a graph showing a change in brightness of an image according to a distance. When the image is displayed on a screen in a general manner as shown in FIG. 8, the displayed image is saturated. However, It is possible to prevent the image from being saturated by measuring the distance from the screen using the sensor and adjusting the light amount according to the distance.

Further, when the distance from the screen is close to the critical distance, the amount of light can be reduced to prevent the glare phenomenon.

The present invention refers to an average gradation value for a current frame of an image or a gradation deviation value between adjacent pixels, and if the image does not require high luminance such as a moving image, the amount of light is further reduced So that power consumption can be reduced.

That is, according to the present invention, not only the amount of light is adjusted according to the distance, but if it is determined that the brightness is further reduced by referring to the average gray-scale value or the like of the current frame, the amount of light can be further reduced and power consumption can be reduced.

As described above, according to the present invention, by using the distance sensor, the amount of laser light is automatically adjusted according to the distance, the saturation phenomenon and the glare of the image in which the image becomes excessively bright can be prevented, and the eyes of the viewer can be protected.

In addition, since the amount of laser light is automatically adjusted according to the distance, the present invention can reduce power consumption.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention. Therefore, the technical scope of the present invention should not be limited to the contents described in the embodiments but should be determined according to the claims.

1 is a view showing a laser display system according to the present invention;

2 is a view showing a light source of FIG. 1 and a drive control unit for driving a light scanner

3 is a view showing a light amount determination unit according to the first embodiment;

4 is a view showing a light amount determination unit according to the second embodiment

5 is a view showing a light amount determination unit according to the third embodiment

6 is a view showing the control unit of Fig. 2

7 is a flowchart for explaining a driving method of a laser display system according to the present invention.

8 is a view showing a change in brightness of an image along a distance

Claims (13)

1. A laser display system for displaying an image on a screen, A distance measuring unit for measuring a distance to the screen; Searching for a light quantity value according to the measured distance when the measured distance exceeds a predetermined threshold distance, extracting a light quantity value of an average gray-scale value for a current frame of the image, A light amount determining unit for determining a laser light amount by comparing and calculating the light amount values; A power source for generating a power source corresponding to the determined amount of laser light; A laser light source for receiving the generated power and outputting laser light; An optical scanner for scanning the output laser beam to display an image on the screen; And And a controller for controlling the distance measuring unit and the light amount determining unit, and controlling the power unit according to the determined amount of laser light. The apparatus according to claim 1, A distance sensor unit for sensing a distance to the screen; And a distance detector for detecting a distance value corresponding to the sensing signal sensed from the distance sensor unit. The apparatus according to claim 1, A storage unit for storing the laser light amount value according to the distance in advance; A comparing unit comparing the measured distance with a predetermined threshold distance; A search unit for searching a laser light intensity value according to the measured distance from the storage unit according to a comparison result of the comparison unit; A light amount value detector for detecting a light amount value of laser light output from the laser light source; And a light amount calculating unit for comparing and calculating the laser light amount value searched from the search unit and the laser light amount value detected by the light amount detecting unit to calculate a final laser light amount value. The apparatus according to claim 1, A storage unit for previously storing a light amount value for the light amount value and the average gray value according to the distance and storing a current frame of the image; A comparing unit comparing the measured distance with a predetermined threshold distance; A search unit for searching a light amount value according to the measured distance from the storage unit according to the comparison result of the comparison unit; A gray value extracting unit for extracting a gray value of each pixel of the stored current frame; A tone value operation unit for calculating an average tone value for the current frame using the extracted tone value; A light amount value extracting unit for extracting a light amount value for the average tone value; And a light quantity value calculation unit for calculating and calculating a final light quantity value by comparing and calculating the light quantity value extracted from the light quantity value extraction unit and the light quantity value searched from the search unit. The apparatus according to claim 1, A storage unit for previously storing a light amount value corresponding to the light amount value and the number of light amount flags according to the distance and storing a current frame of the image; A comparing unit comparing the measured distance with a predetermined threshold distance; A search unit for searching a light amount value according to the measured distance from the storage unit according to the comparison result of the comparison unit; A gray value extracting unit for extracting a gray value of each pixel of the stored current frame; A gray level deviation value calculating unit for calculating a gray level deviation value between adjacent pixels among the pixels; A light quantity flag generating unit for generating a light quantity flag for the gradation deviation value; A light quantity flag counter for counting the number of light quantity flags corresponding to the gradation deviation value; A light amount value extracting unit for extracting a light amount value corresponding to the counted number of light amount flags; And a light quantity value calculation unit for calculating and calculating a final light quantity value by comparing and calculating the light quantity value extracted from the light quantity value extraction unit and the light quantity value searched from the search unit. The apparatus of claim 1, A synchronization signal adjustment unit for adjusting horizontal and vertical synchronization signals of the received video signal; A driving signal generator for generating a driving signal for controlling the driving of the optical scanner according to the adjusted synchronizing signal; A video signal processing unit for signal processing the received video signal according to the adjusted synchronization signal; Generating a first control signal for controlling the power source unit so that the laser light source is driven according to the signal processed video signal and generating a second control signal for controlling the distance measuring unit and the light amount determining unit, And a control signal generator for generating a third control signal for controlling the power unit according to the amount of laser light. A method of driving a laser display system having a laser light source and a light scanner for displaying an image on a screen, Measuring a distance to the screen; Comparing the measured distance to a predetermined threshold distance; Searching a light amount value according to the measured distance and extracting a light amount value of an average gray value for the current frame of the image if the measured distance exceeds the predetermined threshold distance as a result of the comparison, Calculating a final laser light amount value by comparing and calculating the light amount value with the searched light amount value, and determining a laser light amount; And, And driving the laser light source and the light scanner to display an image on the screen in accordance with the determined amount of laser light. 8. The method of claim 7, wherein displaying the image comprises: Receiving an image signal for displaying the image; Adjusting horizontal and vertical sync signals of the received video signal; Generating a driving signal of the optical scanner according to the adjusted synchronizing signal and signal processing the image signal; And driving the optical scanner according to the generated driving signal and driving the laser light source according to the signal processed image signal and the determined amount of laser light to display the image. Method of operating the system. 8. The method of claim 7, wherein measuring the distance to the screen further comprises: Sensing a distance to the screen; And detecting a distance value corresponding to the sensed sensing signal. The method as claimed in claim 7, wherein the step of determining the amount of laser light comprises: Searching a laser light intensity value according to the measured distance and detecting a light intensity value of the laser light output from the laser light source; And comparing the calculated laser light intensity value with the detected laser light intensity value to calculate a final laser light intensity value. delete The method as claimed in claim 7, wherein the step of extracting a light amount value of an average gray- Extracting a gray level value for each pixel of the current frame; Calculating an average gray-level value for the current frame using the extracted gray-level value; And extracting a light amount value with respect to the average gray level value. The method as claimed in claim 7, wherein the step of extracting a light amount value of an average gray- Extracting a gray level value for each pixel of the current frame; Calculating a gradation deviation value between adjacent pixels among the pixels; Generating a light amount flag for the gradation deviation value; Counting the number of light quantity flags respectively corresponding to the gradation deviation values; And extracting a light amount value corresponding to the counted number of light amount flags.

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