KR100460123B1 - Method and apparatus for controlling auto color temperature of projector - Google Patents

Abstract

The present invention relates to a color temperature automatic adjustment device and method for determining the latitude and installation state of an area where an image display device is installed and automatically adjusting the color temperature to a color preferred by users in the area. In the color temperature adjusting apparatus of the projector, a first detection unit for detecting a horizontal state in which the projector is installed, a second detection unit for detecting a magnetic field in which the projector is installed, a detection value of the first detection unit and the second detection unit A control unit for measuring the latitude of the area where the projector is installed and automatically setting the color temperature according to the measured latitude, and adjusting the color temperature according to the latitude so that the color temperature can be set according to the measured latitude. It is configured to include memory to store, and the force caused by the geomagnetic field of the area where the projector is currently installed and the horizontal / vertical error when installed By calculating the latitude and differentiating the color temperature according to the calculated latitude, it is possible to automatically set the color temperature that people in the region like to provide the best image to users, thereby improving user satisfaction. It has an effect.

Description

Method and apparatus for controlling auto color temperature of projector

The present invention relates to a projector, and more particularly, to an apparatus and method for automatically adjusting color temperature of a projector.

In general, when a person looks at the scene, the overall hue is different in proportion to the characteristics of the lighting. For example, under incandescent lamps, they generally have a reddish hue, and under daylight they exhibit a blue hue as compared with incandescent lamps.

Hue appearing as a whole is related to the color temperature. Color temperature refers to the size of light by complete heat radiation, and its unit is Kelvin [K]. If the color temperature is high, the color is blue. If the color temperature is low, the color is red.

Color display systems are widely used in devices such as TVs, DTVs, thin film transistor (TFT) monitors, color printers, digital cameras, projectors, and mobile phones that need to visually convey information to the user. In color display systems, it is necessary to adjust the color temperature to improve image quality.

However, the ideal white that people think is virtually different from person to person. It may be an individual deviation, but in fact there will be a collective deviation. This is because the color actually depends on the reflected light, because the light does not reach the entire earth equally, and the earth is round.

Because of the roundness of the earth, the altitude of the sun passes by different latitudes, and the difference in altitude of the sun results in different wavelengths of light reaching the ground. As a result, the color of the sun that people feel varies greatly depending on the latitude, and the concept of white that people feel changes.

The closer to the equator, the higher the sun's altitude, and the higher the color temperature of white, which is thought to be due to the blue color of the shorter wavelengths in the equator.

On the contrary, the closer you are to the polar regions, the more red the sun looks and the people of this region are accustomed to the sun. In other words, the color temperature of white people in the polar region is low.

In other words, the optimal screen can be realized by adjusting the color temperature according to the region where the display device is sold. But this is not the case for products sold globally rather than sold locally. In this case, the color temperature can be placed in a menu for user selection.

However, for unfamiliar users, this is not easy and makes it hard to achieve the best display. In other words, the current color temperature adjustment is manually selected from the menu, and some sets allow the user to select the color temperature directly from 6500K, 9300K (K is the absolute temperature), and some sets the color temperature low, medium, or high. As the paraphrase is more paradoxical, color temperature adjustment may be different for each display medium.

As described above, the image display apparatus according to the related art only suggests a method of manually adjusting the color temperature, and thus, in most cases, users do not even have a concept of what the color temperature is. Even if provided, it can not be used to maintain a constant color temperature irrespective of the region or the user's taste, so there was a problem that lowers the user satisfaction.

The present invention has been made to solve this problem, the image display to grasp the latitude and installation state of the region where the image display device is installed to automatically match the color temperature to the user's preferred color for each region It is an object of the present invention to provide an apparatus and method for automatically adjusting the color temperature of a device.

1 is a block diagram showing an apparatus for automatically adjusting color temperature of a projector according to the present invention.

2 is a functional diagram showing a geomagnetic field vector

3 is an operation diagram showing a correction angle according to the horizontal sensed by the accelerometer shown in FIG.

4 is a flowchart illustrating a method for automatically adjusting color temperature of a projector according to the present invention.

Explanation of symbols for main parts of the drawings

100: first detection unit 200: second detection unit

300: control unit 400: memory

500: image processing unit

The apparatus for automatically adjusting color temperature of an image display apparatus according to the present invention for achieving the above object includes a first sensing unit for detecting a horizontal state in which the projector is installed in a color temperature adjusting apparatus of a projector, and a magnetic field in which the projector is installed. A second sensing unit for detecting a control unit, a control unit for measuring latitude of an area in which the projector is installed according to the detected values of the first sensing unit and the second sensing unit, and automatically controlling the latitude to a color temperature according to the measured latitude And a memory for storing the color temperature according to the latitude so that the color temperature can be set according to the measured latitude.

Preferably, the first detector includes an accelerometer for detecting horizontal / vertical installation errors (α, β) of the projector, an amplifier for amplifying the errors (α, β) detected by the accelerometer, and each of the amplifiers. It is composed of A / D converter that converts amplified error value into digital value.

More preferably, the second detector includes first to third magnetic field sensors that detect magnetic fields Fx, Fy, and Fz in x, y, and z directions, and magnetic fields sensed by the first to third magnetic field sensors. It is characterized by consisting of an amplification unit for receiving and amplifying (Fx, Fy, Fz), and an A / D converter for converting the value amplified by the amplification unit to a digital value.

Automatic color temperature adjustment method of the projector according to the present invention for achieving the above object, in the color temperature adjustment method of the projector having a first, second detection unit and a memory, the horizontal detection value through the first and second detection unit And detecting a magnetic field value, and if an error is detected in the detected value, correcting the detected error to calculate a normal value, calculating a latitude based on the calculated normal value, and calculating the latitude. According to the present invention comprises the step of automatically adjusting the color temperature previously stored in the memory.

Hereinafter, an apparatus and method for automatically adjusting color temperature of a projector according to the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram illustrating a color temperature adjusting device of a projector according to the present invention, FIG. 2 is a diagram illustrating a geomagnetic field detected by a magnetic field sensor shown in FIG. 1, and FIG. 3 is an accelerometer shown in FIG. 1. A diagram for detecting a horizontal / vertical error detected at

As shown in FIG. 1, the apparatus for adjusting color temperature of a projector according to the present invention includes a first sensing unit 100 for detecting a horizontal state in which the projector is installed, and a projector in which the projector is installed. Measure the latitude of the area in which the projector is installed according to the second detection unit 200 for detecting a force by the magnetic field of the area, and the detection values of the first detection unit 100 and the second detection unit 200, The controller 300 for controlling to be automatically set to the color temperature according to the measured latitude, the memory 400 for storing the color temperature according to the latitude so that the color temperature can be set according to the measured latitude, and the control unit The image processing unit 500 applies an image color previously stored in the memory 400 according to the control signal of 300.

Here, the first detection unit 100 amplifies the accelerometer 101 for detecting the horizontal / vertical installation error (α, β) of the projector, and the error (α, β) detected by the accelerometer 101, respectively. First and second amplifiers 102 and 103 and first and second A / D converters for converting the error values amplified by the first and second amplifiers 102 and 103 to digital values, respectively. 104).

The second detector 200 may include first to third magnetic field sensors 201 to 203 for respectively detecting forces Fx, Fy, and Fz due to magnetic fields in the x, y, and z directions, and the first to third magnetic field sensors 201 to 203. Third to fifth amplifying units 204 to 206 for receiving and amplifying the forces Fx, Fy, and Fz by the magnetic field detected by the first to third magnetic field sensors 201 to 203, and The third to fifth A / D converters 207 to 209 convert the values amplified by the third to fifth amplifiers 204 to 206 into digital values.

Referring to the operation of the color temperature adjusting device of the projector according to the present invention configured as described above are as follows.

First, when power is applied, the accelerometer 101 of the first sensing unit 100 determines whether the projector is installed on a flat flat surface, as shown in FIG. 3, if the projector is installed at an angle. , Angles to be corrected by α and β are detected in the horizontal and vertical directions, respectively.

The correction angle α detected by the accelerometer 101 is input to the first amplifier 102, and the correction angle β is input to the second amplifier 102 and amplified by a predetermined level or more, respectively. The outputs amplified by the first and second amplifiers 101 and 102 are input to the first and second A / D converters 104 and 105 to be quantified and then input to the microcomputer 300.

In addition, the first to third magnetic field sensors 201 to 203 of the second sensing unit 200 have the forces Fx, Fy, and Fz by the geomagnetic fields in the X, Y, and Z directions, respectively. It is detected in the manner as shown in 2.

That is, the two forces Fx and Fy of the horizontal component make it possible to know the north direction, and the vertical force Fz depends on the latitude, because the earth is also round. This force is maximum in the North Pole on a round earth, so this force is maximum, and the distance from the stimulus is far and minimal near the equator. That is, the direction of the force F of the earth's magnetic field changes according to the latitude.

As described above, the respective forces Fx, Fy, and Fz detected by the first to third magnetic field sensors 201 to 203 are input to the third to fifth amplifiers 204 to 206 to be predetermined. The output amplified above the level and amplified by the third to fifth amplifiers 204 to 206 is inputted to the third to fifth A / D converters 207 to 209 to be quantified, and then the microcomputer ( 300).

Then, the microcomputer 300 calculates the latitude according to the outputs of the first sensing unit 100 and the second sensing unit 200, and automatically adjusts the color temperature to the color temperature previously stored in the memory 400 according to the calculated latitude. The image processing unit 500 applies the newly adjusted color temperature according to the control signal of the microcomputer 400 to process the displayable image signal.

That is, the first to third magnetic field sensors 201 to 203 measure the magnitude of the magnetic field force in the direction in which the magnetic field sensor is placed and output it as a voltage. Since it is small, the third to fifth amplifiers 204 to 206 are respectively passed through the third to fifth A / D converters 207 to 209 for the sake of clarity. You can find out by quantifying the size.

In practice, however, this theory is not easy to apply. Since the above idea can be applied accurately when the measurement is made on a plane, in fact, a display medium such as a projector is not installed flat at times, but is installed at an angle to the user's condition, so that the projector faces upward for upward projection. There are many cases.

Therefore, in this case, it is necessary to correct this to accurately measure the current user's latitude. When the magnetic field sensor is installed on a non-flat surface according to the placed situation, a horizontal / vertical error is generated as shown in FIG. 3. will be.

When the color temperature adjustment method of the projector according to the present invention configured as described above is described with reference to FIG. 4, first, it is determined whether the user inputs a power-on signal (S11).

Subsequently, when the user inputs a power-on signal, the determination result S11 determines the detection values Fx, Fy, Fz, α, β detected by the first and second detectors 100 and 200. It receives an input (S12).

In operation S13, it is determined whether an error exists in the detected values Fx, Fy, Fz, α, and β.

Subsequently, in the determination result S13, if an error exists, the normal values are calculated by applying the error values Fx ', Fy', and Fz 'to the following equations (S14 to S15).

When the normal values Fx, Fy, and Fz calculated as described above are applied to the following equations, the dip θ is calculated (S16).

The latitude may be calculated through the calculated dip θ (S17).

Subsequently, the color temperature corresponding to the calculated latitude is extracted from the memory for image processing (S18 to S19).

As described above, the apparatus and method for adjusting the color temperature of the projector according to the present invention calculates three-dimensional values (Fx, Fy, Fz) of the geomagnetic field without errors, and uses the calculated values (Fx, Fy, Fz). It is possible to obtain a dip θ by using the calculated dip θ to determine latitude.

Then, the color temperature favorite of the people where the projector is currently installed is extracted from the table pre-stored in the memory, and the color temperature is automatically adjusted to provide the best video signal.

As described above, the apparatus and method for adjusting the color temperature of the projector according to the present invention calculates latitude according to the force caused by the geomagnetic field of the region where the projector is currently installed and the horizontal / vertical error when the projector is installed, and calculates the latitude. Therefore, by differentiating the color temperature can automatically set the user's favorite color temperature in the area to provide the user with the best image, thereby improving the user's satisfaction.

Claims (4)

In the projector's color temperature adjuster, A first detecting unit detecting a horizontal state where the projector is installed; A second detector for detecting a magnetic field in which the projector is installed; A controller configured to measure latitude of an area in which the projector is installed according to the detected values of the first and second detectors, and to automatically set the color temperature according to the measured latitude; And, And a memory for storing the color temperature according to the latitude so that the color temperature can be set according to the measured latitude. The method of claim 1, The first detection unit An accelerometer for detecting horizontal and vertical installation errors (α, β) of the projector, An amplifier for amplifying the errors (α, β) detected by the accelerometer, respectively; And an A / D converter converting the error values amplified by the amplifier into digital values. The method of claim 1, The second detector is first to third magnetic field sensors for sensing forces Fx, Fy, and Fz by magnetic fields in the x, y, and z directions, respectively, An amplifying unit for receiving and amplifying the forces Fx, Fy, and Fz by the magnetic field detected by the first to third magnetic field sensors; And an A / D converter converting the value amplified by the amplifier into a digital value. In the method of adjusting the color temperature of a projector having a first and a second detector and a memory, Detecting a force due to a horizontal sensing value and a magnetic field through the first and second sensing units; If an error is detected in the detected value, calculating a normal value by correcting the detected error; Calculating latitude based on the calculated normal value; And, And adjusting the color temperature pre-stored in the memory according to the calculated latitude.