CN102193285A - Laser projector white balance automatic adjustment device and method - Google Patents

Abstract

The invention discloses an automatic white balance adjusting device of a laser projector, which comprises a laser light source, a heat dissipation mechanism, a micro-electromechanical lens, protective glass, a driving mechanism, a temperature sensor, an inductor and a processing mechanism, wherein the laser light source is arranged on the micro-electromechanical lens; the temperature sensor is used for detecting the temperature of the laser light source, the sensor is used for detecting the power of reflected light, when the temperature of the laser light source rises, the heat dissipation mechanism is used for reducing the temperature of the laser light source, when the heat dissipation mechanism reaches a limit, a compensation value of normal output of the laser light source is calculated according to the received reflected light, the laser light source driver correspondingly drives the laser light source to generate normal output power according to the compensation value, and then automatic adjustment of white balance is achieved, so that adjustment is simple and rapid. In addition, the invention also discloses an automatic white balance adjusting method of the laser projector.

Description

Laser projector white balance automatic adjustment device and method

technical field

The invention relates to a device and method for automatically adjusting white balance, in particular to a device and method suitable for automatically adjusting the white balance of a laser projector.

Background technique

White balance is a very important concept in the projection system, through which a series of problems of color reproduction and tone processing can be solved; the so-called white balance is to adjust the ratio of the three primary colors of red, green and blue under different light conditions so that It becomes white after mixing; the object itself shows its own color by reflecting light, but if the color component of the white light source changes, it will affect the color of the reflected light, and will directly or indirectly change the color of the object itself. Form chromatic aberration, this phenomenon is more likely to occur in the occasion of artificial light, because the color temperature of the lamp is different, the image will have different degrees of chromatic aberration, so the white balance is related to the color temperature of the three primary colors.

In laser projectors, white balance adjustments are often manually adjusted, but laser projectors use lasers as light sources, and lasers are very sensitive to temperature, so lasers will have aging problems due to the length of use, or due to temperature changes. The output power of the laser is insufficient. These problems often occur slowly after the power is turned on. Therefore, it is possible that the pre-input parameters at the time of power-on may become inapplicable due to temperature changes after a period of time. Therefore, the automatic adjustment of white balance is especially important. important.

Contents of the invention

The object of the present invention is to provide a device and method capable of automatically adjusting the white balance of a laser projector to address the above-mentioned deficiencies in the prior art.

In order to achieve the above object, the laser projector white balance automatic adjustment device provided by the present invention includes a laser light source, a heat dissipation mechanism, a micro-electromechanical lens, a protective glass, a driving mechanism, a temperature sensor, an inductor and a processing mechanism; used to generate the laser light required by the projector; the heat dissipation mechanism is used to release the heat generated by the laser light source; the micro-electromechanical lens is used to reflect the laser light generated by the laser light source; the protective glass and the micro The electromechanical lens is installed correspondingly, and is used to project the light reflected by the microelectromechanical lens to form outgoing light, and the light partially reflected by the protective glass forms reflected light; the driving mechanism includes a microelectromechanical lens driver and a laser light source driver , the MEMS lens driver is used to drive the MEMS lens to swing, the laser light source driver is used to drive the laser light source to generate normal output power; the temperature sensor is used to detect the temperature of the laser light source; The sensor is used to detect the power of the reflected light formed by the partial reflection of the protective glass; the processing mechanism pre-stores the normal output power range value of the laser light source, and the processing mechanism according to the reflected light received by the sensor A compensation value for the laser light source to achieve a normal output is calculated, and the laser light source driver corresponds to drive the laser light source to generate a normal output power according to the compensation value.

Correspondingly, the present invention also provides a method for automatically adjusting the white balance of a laser projector, comprising the following steps: (1) receiving the detected temperature of the laser light source and the detected power of the reflected light; The temperature of the light source and the power of the reflected light calculate the compensation value of the laser light source to achieve normal output; (3) control the power of the laser light source to produce normal output according to the compensation value.

As mentioned above, the laser projector white balance automatic adjustment device of the present invention uses a temperature sensor to detect the temperature of the laser light source, and the sensor detects the power of the reflected light. When the temperature of the laser light source rises, the heat dissipation mechanism is used to reduce the temperature of the laser light source. When the mechanism reaches the limit, it calculates the compensation value for the laser light source to reach the normal output according to the received reflected light, and the laser light source driver drives the laser light source to generate the normal output power according to the compensation value, and then realizes the automatic adjustment of the white balance. Make adjustment simple and fast.

Description of drawings

Fig. 1 is a functional block diagram of the white balance automatic adjustment device of the laser projector of the present invention.

Fig. 2 is a flow chart of the method for automatically adjusting the white balance of the laser projector of the present invention.

Fig. 3 is a functional block diagram of the first embodiment of the automatic white balance adjustment device of the laser projector of the present invention.

Fig. 4 is a functional block diagram of the second embodiment of the automatic white balance adjustment device of the laser projector of the present invention.

The reference signs in the figure are explained as follows:

Laser projector white balance automatic adjustment device 100

MEMS lens driver 101 Laser light source driver 102

Laser light source 103 Micro-electromechanical lens 104

Protective glass 105 Temperature sensor 106

Heat Dissipation Mechanism 107 Image Sensor 108

Light Sensor 109a Current Voltage Converter 109b

Digitizer 109c Processing Mechanism 110

Detailed ways

In order to describe the technical content, structural features, achieved goals and effects of the present invention in detail, the following will be described in detail in conjunction with the embodiments and accompanying drawings.

Please refer to Fig. 1, laser projector white balance automatic adjustment device 100 of the present invention comprises driving mechanism, laser light source 103, micro-electromechanical lens 104, protective glass 105, temperature sensor 106, heat dissipation mechanism 107, processing mechanism 110 and inductor 108, drives The mechanism further includes a microelectromechanical lens driver 101 and a laser light source driver 102; wherein, the laser light source 103 is used to generate the laser light required by the projector; the microelectromechanical lens 104 is used to reflect the laser light generated by the laser light source 103; the protective glass 105 Correspondingly installed with the microelectromechanical lens 104, it is used to project the light reflected by the microelectromechanical lens 104 to form outgoing light, and the light partially reflected by the protective glass 105 forms reflected light; the heat dissipation mechanism 107 is used to release the laser light source 103 The heat generated; the microelectromechanical lens driver 101 is used to drive the microelectromechanical lens 104 to swing, and the laser light source driver 102 is used to drive the laser light source 103 to generate normal output power. The laser light source driver 102 and the microelectromechanical lens driver 101 are all connected with the processing mechanism 110 is electrically connected; the temperature sensor 106 is used to detect the temperature of the laser light source 103; the sensor 108 is used to detect the power of the reflected light formed by the partial reflection of the protective glass 105; the processing mechanism 110 prestores that the laser light source 103 is normal The output power range value, the processing mechanism 110 calculates the compensation value for the laser light source 103 to achieve normal output according to the reflected light received by the sensor, and the laser light source driver 102 drives the laser light source correspondingly according to the compensation value 103 produces normal output power.

Please refer to Fig. 2, the laser projector white balance automatic adjustment method of the present invention, comprises the following steps:

(S001) receiving the detected temperature of the laser light source and the detected power of the reflected light;

(S002) Based on the temperature of the detected laser light source and the power of the reflected light, calculate the compensation value for the laser light source to reach normal output;

(S003) Control the laser light source to generate normal output power according to the compensation value.

Please refer to FIG. 3, in the first embodiment of the laser projector white balance automatic adjustment device 100 of the present invention, the sensor is an image sensor 108, and the image sensor 108 is used to detect the power of the reflected light formed by partial reflection of the protective glass 105 and The power signal is converted into a digital signal output.

The principle of this embodiment will be described in detail below. After the system starts, the laser light source driver 102 drives the laser light source 103 to emit laser light, and the micro-electro-mechanical mirror driver 101 drives the micro-electro-mechanical mirror 104 to swing, so that the laser passes through the swing of the micro-electro-mechanical mirror 104 to scan The laser emitted by the micro-electromechanical lens 104 is projected through the protective glass 105 to form outgoing light. During the process of projecting the laser, because the laser passes through different media, a small amount of laser light will be reflected back to form reflected light; in the system During operation, the output power of the laser light source 103 will decrease with the increase of the ambient temperature and its own heat. Therefore, the temperature sensor 106 is used to detect the temperature of the laser light source 103 and send the temperature signal to the processing mechanism 110. The image sensor 108 is used to detect the power of the reflected light, and convert the detected power value into a digital signal and send it to the processing mechanism 110; when the temperature sensor 106 detects that the temperature of the laser light source 103 rises, the processing mechanism 110 controls the cooling mechanism 107 to start Used to release the heat of the laser light source 103; when the cooling mechanism 107 has reached the limit, the output power of the laser light source 103 will decrease again as the temperature rises. At this time, the processing mechanism 110 will Calculate the compensation value for the laser light source 103 to achieve normal output, and control the laser light source driver 102 to drive the laser light source 103 to generate a normal output power value according to the compensation value, so as to realize automatic adjustment of white balance.

Please refer to FIG. 4, in the second embodiment of the laser projector white balance automatic adjustment device 100 of the present invention, the sensor is a light sensor 109a, and the laser projector white balance automatic adjustment device 100 also includes a current-voltage converter 109b and a digital conversion The light sensor 109c is used to detect the power of the reflected light formed by the partial reflection of the protective glass 105, and convert the power signal into a current form and output it to the current-voltage converter 109b, and the current-voltage converter 109b converts the current signal into a voltage The signal is output to the digital converter 109c, and the digital converter 109c converts the voltage signal into a digital signal and sends it to the processing mechanism 110.

The principle of this embodiment will be described in detail below. After the system starts, the laser light source driver 102 drives the laser light source 103 to emit laser light, and the micro-electro-mechanical mirror driver 101 drives the micro-electro-mechanical mirror 104 to swing, so that the laser passes through the swing of the micro-electro-mechanical mirror 104 to scan The laser emitted by the micro-electromechanical lens 104 is projected through the protective glass 105 to form outgoing light. During the process of projecting the laser, because the laser passes through different media, a small amount of laser light will be reflected back to form reflected light; in the system During operation, the output power of the laser light source 103 will decrease with the increase of the ambient temperature and its own heat. Therefore, the temperature sensor 106 is used to detect the temperature of the laser light source and send the temperature signal to the processing mechanism 110. The light sensor 109a Used to detect the power of reflected light, and convert the detected power value into a current output, the current-to-voltage converter 109b converts the current into a voltage output, and the digital converter 109c converts the voltage into a digital signal and sends it to the processing mechanism 110; When the temperature sensor 106 detects that the temperature of the laser light source 103 rises, the processing mechanism 110 controls the cooling mechanism 107 to start for releasing the heat of the laser light source 103; The output temperature will decrease again. At this time, the processing mechanism 110 calculates the compensation value for the laser light source 103 to reach a normal output according to the reflected light received by the image sensor 108, and controls the laser light source driver 102 to drive the laser light source 103 correspondingly to generate a normal output according to the compensation value. Power value, so as to realize the automatic adjustment of white balance.

To sum up, the laser projector white balance automatic adjustment device 100 of the present invention adopts the temperature sensor 106 to detect the temperature of the laser light source 103, and the light sensor or image sensor detects the power of the reflected light. When the temperature of the laser light source 103 rises, the heat dissipation mechanism 107 is used to Reduce the temperature of the laser light source. When the cooling mechanism 107 reaches the limit, calculate the compensation value for the laser light source 103 to reach normal output according to the received reflected light, and the laser light source driver 102 drives the laser light source 103 correspondingly according to the compensation value to generate normal Output power, and then realize the automatic adjustment of white balance, making the adjustment simple and fast.

Claims (6)

1. a laser projection white balance self-checking device is characterized in that, comprising:

LASER Light Source is used to produce the required laser of laser projection;

Cooling mechanism is used to discharge the heat that described LASER Light Source produces;

Micro electronmechanical eyeglass is used for the laser-bounce that described LASER Light Source produces is gone out;

Cover glass, described cover glass and the corresponding installation of described micro electronmechanical eyeglass are used for the light that described micro electronmechanical eyeglass reflects throwed away to form penetrating light, and form reflected light through the light of described cover glass partial reflection;

Driving mechanism, described driving mechanism comprises micro electronmechanical eyeglass driver and LASER Light Source driver, described micro electronmechanical eyeglass driver is used to drive described micro electronmechanical eyeglass swing, and described LASER Light Source driver is used to drive the power that described LASER Light Source produces normal output;

Temperature sensor is used to detect the temperature of described LASER Light Source;

Inductor is used to detect the catoptrical power that forms through described cover glass partial reflection;

Processing mechanism, described processing mechanism prestores the power range values of the normal output of described LASER Light Source, the reflected light that described processing mechanism receives according to described inductor calculates the offset that described LASER Light Source reaches normal output, and described LASER Light Source driver is according to the corresponding power that drives the normal output of described LASER Light Source generation of described offset.

2. laser projection white balance self-checking device as claimed in claim 1 is characterized in that: described inductor is an imageing sensor.

3. laser projection white balance self-checking device as claimed in claim 1 is characterized in that: described inductor is an optical sensor.

4. laser projection white balance self-checking device as claimed in claim 3, it is characterized in that: also comprise current-to-voltage convertor and digital quantizer, described current-to-voltage convertor is electrically connected with described optical sensor and described digital quantizer, and described digital quantizer is electrically connected with described processing mechanism.

5. a laser projection white balance Automatic adjustment method is characterized in that, comprises the steps:

(1) temperature and the detected catoptrical power of the detected LASER Light Source of reception;

(2) based on the temperature and the catoptrical power of the LASER Light Source that detects, calculate the offset that LASER Light Source reaches normal output;

(3) produce the power of normal output according to described offset control LASER Light Source.

6. laser projection white balance Automatic adjustment method as claimed in claim 5 is characterized in that, described step (1) also comprises before: the normal power range values of exporting of LASER Light Source is prestored to handle in the mechanism.

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