KR20120029246A - Apparatus and method of controlling brightness of lamp in a projector automatically - Google Patents
Apparatus and method of controlling brightness of lamp in a projector automatically Download PDFInfo
- Publication number
- KR20120029246A KR20120029246A KR1020100091220A KR20100091220A KR20120029246A KR 20120029246 A KR20120029246 A KR 20120029246A KR 1020100091220 A KR1020100091220 A KR 1020100091220A KR 20100091220 A KR20100091220 A KR 20100091220A KR 20120029246 A KR20120029246 A KR 20120029246A
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- South Korea
- Prior art keywords
- distance
- lamp
- brightness
- amount
- projector
- Prior art date
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/142—Adjusting of projection optics
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/20—Lamp housings
- G03B21/2053—Intensity control of illuminating light
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/53—Means for automatic focusing, e.g. to compensate thermal effects
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/3406—Control of illumination source
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/12—Picture reproducers
- H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
- H04N9/3141—Constructional details thereof
- H04N9/315—Modulator illumination systems
- H04N9/3155—Modulator illumination systems for controlling the light source
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/12—Picture reproducers
- H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
- H04N9/3191—Testing thereof
- H04N9/3194—Testing thereof including sensor feedback
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Optics & Photonics (AREA)
- Computer Hardware Design (AREA)
- Theoretical Computer Science (AREA)
- Projection Apparatus (AREA)
Abstract
Description
The present invention relates to an apparatus and method for adjusting lamp brightness of a projector, and more particularly, to an apparatus and method for automatically adjusting lamp brightness of a projector that can reduce power consumption of a small projector and provide optimal screen brightness.
A 'projector' is a type of projection device that is an optical device that shows a large number of people by simultaneously projecting pictures, pictures, characters, etc. on slides and transparent paper onto the screen through a lens. In particular, the 'beam projector' is connected to a computer such as a desktop or a laptop, and the monitor output screen is projected on the screen to show a lot of applications such as watching movies or presentations.
Recently, due to the development of technology, a compact projector (aka PICO Projector), which is easy to carry, has been developed and released, and a projector built in a mobile phone is also being developed.
On the other hand, since the projector emits strong light through the lens to cause an image to form on a screen located a certain distance apart, the power consumption of the light emitting lamp is considerably high. Therefore, when using a portable such as a small projector is difficult to use a commercial power source for a long time using only the built-in battery is impossible.
In other words, the conventional beam projector emits a constant beam regardless of the surrounding environment and the distance to the screen. Therefore, the screen screen is dark and difficult to see in a bright place, while in a dark place close to the screen emits excessive light is wasted energy. For this reason, the life of the lamp is shortened, a lot of current is unnecessarily consumed, and the external heat generation of the product is severe, causing a problem of low efficiency.
Accordingly, there is a demand for a method for optimizing the brightness of light emitted from a small projector and outputting power without reducing inconvenience for users to view an image.
An object of the present invention is to provide an apparatus and method for automatically adjusting lamp brightness of a projector that can provide an optimal screen brightness in consideration of the distance between the projector and the screen and the brightness of the environment around the projector.
In addition, an object of the present invention is to determine the optimal screen brightness in consideration of the distance between the projector and the screen and the brightness of the environment around the projector, the distance of the distance by the lens focus adjustment wheel to increase the reliability of the distance information measured from the distance sensor The present invention provides an apparatus and method for automatically adjusting lamp brightness of a projector for determining accuracy.
In addition, an object of the present invention is to determine the optimal screen brightness in consideration of the distance between the projector and the screen and the brightness of the environment around the projector, by accumulating and comparing the measured values to the optimum screen brightness without being affected by temporary environmental changes It is to provide an apparatus and method for automatically adjusting the lamp brightness of the projector that can provide.
In order to achieve the above object, the device according to the present invention comprises a wheel detecting unit for determining the distance between the projector and the screen with a resistance value that is variable in conjunction with the focus of the lens focusing wheel; An illuminance sensor for detecting the brightness of the surrounding environment of the place where the projector is installed; A controller configured to receive distance information and brightness information from the wheel detector and the illuminance detector, respectively, and determine an optimal amount of lamp irradiation beam from the received distance information and brightness information; And a lamp driver configured to supply an amount of lamp driving current to the light engine unit according to the optimum amount of lamp irradiation beam determined by the controller when power is applied.
In this case, the control unit is characterized in that for determining the optimal lamp irradiation beam amount is increased in proportion to the received distance information and brightness information, respectively.
On the other hand, the apparatus further comprises a database for storing the data determined by the experiment through the repetitive irradiation the optimal amount of the lamp irradiation beam amount for the distance information and brightness information, the control unit from the received distance information and brightness information from the The optimum lamp irradiation beam amount is determined according to the data stored in the database.
In addition, the apparatus further comprises a distance sensor unit for measuring the distance to the screen by a distance sensor for measuring the distance using the wavelength, the control unit further receives the distance information measured from the distance sensor unit, When the distance value measured by the distance sensor unit and the distance value determined by the wheel sensing unit are included in the set error range, the optimum lamp irradiation beam amount is determined by giving priority to the distance value measured by the distance sensor unit. Characterized in that it is used as information for.
In addition, the control unit periodically determines the optimal lamp irradiation beam amount and stores the determined value, compares the optimal lamp irradiation beam amount accumulated in the last N times, the current than the number of the optimal lamp irradiation beam amount currently applied When the number of optimal lamp irradiation beam amounts having a different value from is large, the lamp irradiation beam amount may be adjusted to the optimum lamp irradiation beam amount having another value.
In order to achieve the above object, the method according to the present invention comprises the steps of determining the distance between the projector and the screen with a resistance value that is variable in conjunction with the focus of the lens focusing wheel; Detecting brightness of a surrounding environment of a place where a projector is installed; Determining an optimal lamp irradiation beam amount from the distance and brightness information; And adjusting the amount of lamps irradiated from the lamp by adjusting the amount of lamp driving current according to the determined optimal amount of lamp irradiation beams.
According to the present invention, by adjusting the brightness of the lamp to be irradiated in consideration of the illuminance of the installation environment of the projector and the distance to the screen, it is possible to reduce the unnecessary driving current of the lamp, and further extend the life of the lamp. .
In addition, when applied to a portable projector, it is possible to reduce the battery consumption by more than 10% compared to the existing products can improve the efficiency.
In addition, according to the present invention, in determining the optimum screen brightness, by determining the distance by the resistance value that is variable in conjunction with the focus of the lens focusing wheel, the advantage of increasing the reliability of the distance information measured from the distance sensor There is this.
In addition, according to the present invention, even if a temporary environmental change occurs in the projector, there is an advantage that can provide the optimum screen brightness irrespective of such environmental change.
1 is a block diagram showing the structure of a projector according to the present invention;
2 is a flowchart illustrating a procedure for automatically adjusting lamp brightness of a projector according to the present invention.
3 is a flowchart illustrating a procedure of automatically adjusting lamp brightness of a projector according to an exemplary embodiment of the present invention.
4 is a flowchart illustrating a procedure of automatically updating lamp brightness of a projector according to an embodiment of the present invention.
A typical projector is driven by an independent device. When the projector is placed in various environments depending on the application, the image is hard to see on the screen if the surrounding environment is brighter than the lamp light. In addition, in a dark environment, the lamp emits light more than necessary, resulting in lamp life and energy loss.
The present invention proposes a method for automatically reducing the brightness of the projector lamp according to the surrounding environment, saving current consumption, which is an important issue in a portable pico projector, and extending the life of the lamp. In this case, the distance from the screen and the brightness around the projector may be taken into consideration as an environmental element to determine the brightness of the lamp.
In the present invention, the distance between the projector and the screen is determined by a variable resistance in conjunction with the focus of the lens focus adjustment wheel in the wheel detection unit for measuring the distance to the screen, and the wheel detection when the measured value by the distance sensor is applied The value determined by the negative person will increase the reliability of the measured value. In addition, the projector ambient brightness may be measured using an illuminance sensor, and the optimal amount of lamp irradiation beam is determined from the measured distance information and the ambient brightness.
In this case, the method of determining the optimal lamp irradiation beam amount from the distance information and the brightness information may be determined by calculating the correlation of each variable value or may be determined by the data table created by the experimental results.
DETAILED DESCRIPTION Hereinafter, a detailed description of a preferred embodiment of the present invention will be described with reference to the accompanying drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.
1 is a block diagram showing the structure of a projector according to the present invention. Referring to FIG. 1, the
First, when power is applied from the
On the other hand, the
The
Therefore, when it is determined that the beam amount determined according to the sensed illuminance and the distance to the screen is appropriate for the current illuminance and the distance to the screen, the driving current of the
On the other hand, when the beam amount currently irradiated is smaller than the determined beam amount (that is, when it is not bright), the
Hereinafter, the function of each structure part is demonstrated in detail.
First, the
The
The
The
The
The lens focus
As such, when the focus is adjusted by the displacement of the
The
In this case, the
On the other hand, when the optimal amount of lamp irradiation beam is determined by an experimental data table, the brightness is set in a table divided into several stages (for example, seven stages) and stored in the memory according to the illuminance and the distance to the screen. Afterwards, the optimum amount of lamp irradiation beam is determined with reference to this. That is, the data value received by the
Hereinafter, a procedure of automatically adjusting lamp brightness according to an exemplary embodiment of the present invention will be described with reference to FIGS. 2 to 4.
2 is a flowchart illustrating a procedure of automatically adjusting lamp brightness of a projector according to the present invention. Referring to FIG. 2, first, a distance from a screen is determined by using a resistance value that is linked with a lens focusing wheel (S201). In addition, the illuminance sensor detects the illuminance around the projector (S202).
After calculating the optimum screen brightness control value of the projector according to the present invention from the measured distance value and illuminance value (S203), the screen brightness of the projector is controlled (S204) by the calculated control value.
On the other hand, according to an embodiment of the present invention as described above it is also possible to measure and apply the distance by the distance sensor of the distance sensor. However, since the distance sensor is a distance measurement by the ultrasonic or infrared sensor, accurate distance measurement with the screen may be difficult due to the propagation or reflection of radio waves, and may cause inaccurate results. Therefore, according to an embodiment of the present invention, by applying the distance measurement value measured by the
3 is a flowchart illustrating a procedure of automatically adjusting lamp brightness of a projector according to an exemplary embodiment of the present invention. Referring to FIG. 3, first, the distance between the projector and the screen is measured by a distance sensor (S301), and the distance from the screen is determined by a resistance value that is variable in conjunction with the lens focus adjusting wheel (S302). In addition, the ambient light is sensed by the illumination sensor (S303).
In the meantime, since the distance value measured by the distance sensor may be inaccurate according to an embodiment of the present invention, the distance value determined by the lens focusing wheel is verified. That is, the measured value by the distance sensor and the measured value by the lens focusing wheel are compared (S304), and if the difference is within a preset error range, the reliability of the value measured by the distance sensor is recognized and optimized. Apply to screen brightness calculation (i.e., calculation of optimal lamp irradiation beam quantity).
On the other hand, when the difference between the measured value by the distance sensor and the measured value by the lens focusing wheel is out of a predetermined error range, the value measured by the distance sensor is not reliable, so the value by the lens focusing wheel is changed. Applies to the calculation of optimal screen brightness.
The optimum screen brightness control value of the projector is calculated from the distance value and illuminance value thus determined (S308), and the screen brightness of the projector is controlled (S309) by the calculated control value.
On the other hand, even if the optimized screen brightness is calculated and applied according to the present invention as described above, if the peripheral illumination changes or the distance to the screen is changed by moving the projector, it is necessary to readjust the optimized screen brightness. However, when the illuminance value or the distance value changes temporarily or momentarily, it is desirable not to reflect this.
4 is a flowchart illustrating a procedure of automatically updating lamp brightness of a projector according to an exemplary embodiment of the present invention. Referring to FIG. 4, as described above, screen brightness control (S401) of the projector by distance and illuminance measurement is performed, and then the screen brightness is adjusted by periodically measuring distance and illuminance.
Accordingly, when the timer is driven (S402) and the measurement period arrives (S403), the distance and illuminance are re-measured in accordance with the above-described method (S404), and then the optimum screen brightness control value is calculated using the re-measured value ( S405).
In this case, when a change in the measured illuminance and distance occurs, it should be reflected in determining the optimal screen brightness, but it is preferable not to reflect this in the case of a temporary change. For example, the illuminance around the projector may be temporarily brightened or darkened by external factors, and the main body of the projector may be shaken for a while to change the distance measurement value. In such a case, it is desirable to keep the original optimum value as it is. Therefore, the screen brightness is adjusted only when the changed value is maintained by comparing the accumulated measured value according to the exemplary embodiment of the present invention.
That is, the optimal screen brightness control value calculated periodically is stored in the memory (S406), and the brightness control value stored for the last N times is compared (S407). As a result of the comparison, when the number of the same brightness control value as before is greater than the number of other brightness control values than before, the current brightness level is maintained as it is (S409). On the other hand, if the number of brightness control values different from the existing one is greater than the same brightness control value as a result of the comparison, the brightness is adjusted to the changed control value (S410).
In another method, when the changed brightness control value in the last N times of brightness control values appears more than a predetermined number of times (or lasts for a predetermined time or more), it is preferable to apply the optimum brightness level as the changed brightness control value.
For example, if the existing optimum brightness level is set to 5 and is currently being applied, but the optimum brightness level is changed to 4 according to the periodically measured result due to the darkening of the ambient illumination, the accumulated brightness level value of 4 When the number of times is greater than 5 or the level value of 4 is maintained for a predetermined time, it is preferable to change the optimum brightness level to 4 and apply it.
On the other hand, in the embodiment of the present invention has been described with respect to specific embodiments, various modifications are possible without departing from the scope of the invention. Therefore, the scope of the present invention should not be limited by the illustrated embodiments, but should be determined by the scope of the appended claims and equivalents thereof.
100: projector 101: illuminance detection unit
102
104
106: light engine part 107: lens focusing wheel part
108: wheel detection unit 110: screen wall
Claims (10)
An illuminance sensor for detecting the brightness of the surrounding environment of the place where the projector is installed;
A controller configured to receive distance information and brightness information from the wheel detector and the illuminance detector, respectively, and determine an optimal amount of lamp irradiation beam from the received distance information and brightness information; And
And a lamp driver for controlling and supplying an amount of lamp driving current to the light engine unit according to the optimal lamp irradiation beam amount determined by the controller when power is applied.
And the optimum lamp irradiation beam amount is determined to increase in proportion to the received distance information and brightness information, respectively.
And a database for storing data determined by an experiment through an iterative irradiation of an optimal amount of lamp irradiation beams for the distance information and brightness information.
And the control unit determines the optimum lamp irradiation beam amount according to the data stored in the database from the received distance information and brightness information.
The apparatus may further include a distance sensor unit configured to measure a distance from the screen by a distance sensor measuring a distance using a wavelength.
The controller further receives distance information measured from the distance sensor unit, and when the distance value measured by the distance sensor unit and the distance value determined by the wheel sensor unit are included in a set error range, the distance sensor unit The apparatus for automatically adjusting lamp brightness of a projector, characterized in that it is used as information for determining the optimum lamp irradiation beam amount by giving priority to the distance value measured by.
Periodically determining the optimal amount of lamp irradiation beam and storing the determined value,
By comparing the optimal amount of the lamp irradiation beam accumulated in the last N times, if the number of the optimal amount of the lamp irradiation beam having a value different from the present than the number of the optimal lamp irradiation beam amount currently applied, the optimum of the other value The lamp brightness automatic adjustment device of the projector characterized by adjusting the lamp irradiation beam amount by the lamp irradiation beam amount.
Detecting brightness of a surrounding environment of a place where a projector is installed;
Determining an optimal lamp irradiation beam amount from the distance and brightness information; And
And adjusting the amount of lamps irradiated from the lamp by adjusting the amount of lamp driving current according to the determined optimal amount of lamp irradiation beams.
And determining the lamp brightness to increase in proportion to the distance and brightness information, respectively.
The method for automatically adjusting lamp brightness of a projector, characterized in that the optimal lamp irradiation beam quantity for the distance and brightness information is stored in an experiment and determined according to the stored data.
Measuring distance to the screen by a distance sensor measuring distance using a wavelength;
When the distance value measured by the distance sensor and the distance value determined as a resistance value that is variable in conjunction with the focus of the lens focusing wheel are included in the set error range, the distance value measured by the distance sensor is given priority. A method of automatically adjusting lamp brightness of a projector, which is used as information for determining an optimal lamp irradiation beam amount.
Periodically determining the optimal amount of lamp irradiation beam and storing the determined value;
Comparing the optimal amount of lamp irradiation beams accumulated in the last N times; And
As a result of the comparison, when the number of optimal lamp irradiation beams having a value different from the present is greater than the number of optimal lamp irradiation beams currently applied, adjusting the lamp irradiation beam amount to the optimum lamp irradiation beam amount of the other value. Lamp brightness automatic adjustment method of the projector characterized in that it further comprises.
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KR1020100091220A KR20120029246A (en) | 2010-09-16 | 2010-09-16 | Apparatus and method of controlling brightness of lamp in a projector automatically |
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Cited By (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN104991432A (en) * | 2015-07-26 | 2015-10-21 | 北京工业大学 | Method for adjusting laser display brightness |
KR20150139648A (en) | 2014-06-03 | 2015-12-14 | 주식회사 티오이십일콤즈 | Beam projector |
WO2016125966A1 (en) * | 2015-02-04 | 2016-08-11 | 엘지전자 주식회사 | Image projection apparatus and operation method thereof |
CN106840121A (en) * | 2017-03-27 | 2017-06-13 | 青岛镭创光电技术有限公司 | level and control method |
CN107305312A (en) * | 2016-04-18 | 2017-10-31 | 扬明光学股份有限公司 | Projection brightness and the automatic adjustment system and method for contrast |
KR20180063546A (en) | 2016-12-02 | 2018-06-12 | (주)캐스트프로 | Portable Projector Device |
CN108957927A (en) * | 2018-07-19 | 2018-12-07 | 苏州博学智能科技有限公司 | A kind of office projection instrument |
CN110858052A (en) * | 2018-08-23 | 2020-03-03 | 深圳光峰科技股份有限公司 | Projector brightness adjusting system and brightness adjusting method |
KR20200113127A (en) | 2019-03-22 | 2020-10-06 | 주식회사 케이홀로그램 | Image processing system using projector |
CN113267943A (en) * | 2021-04-20 | 2021-08-17 | 当趣网络科技(杭州)有限公司 | Method for adjusting brightness of standby indicator light, projector and readable storage medium |
KR20220123808A (en) | 2021-03-02 | 2022-09-13 | 조원석 | Projector equipped with cancave asymmetric non-spherical emission lens to improve brightness of image beam and prevent deterioration of lcd display element |
KR20220158397A (en) * | 2021-05-24 | 2022-12-01 | 주식회사 이수메디 | Chart projector that adjusts the brightness of LED lighting according to the illuminance of the optometry room |
-
2010
- 2010-09-16 KR KR1020100091220A patent/KR20120029246A/en not_active Application Discontinuation
Cited By (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR20150139648A (en) | 2014-06-03 | 2015-12-14 | 주식회사 티오이십일콤즈 | Beam projector |
WO2016125966A1 (en) * | 2015-02-04 | 2016-08-11 | 엘지전자 주식회사 | Image projection apparatus and operation method thereof |
US10310676B2 (en) | 2015-02-04 | 2019-06-04 | Lg Electronics Inc. | Image projection apparatus and operation method thereof |
CN104991432A (en) * | 2015-07-26 | 2015-10-21 | 北京工业大学 | Method for adjusting laser display brightness |
CN107305312A (en) * | 2016-04-18 | 2017-10-31 | 扬明光学股份有限公司 | Projection brightness and the automatic adjustment system and method for contrast |
CN107305312B (en) * | 2016-04-18 | 2023-10-24 | 扬明光学股份有限公司 | Automatic adjustment system and method for projection brightness and contrast |
KR20180063546A (en) | 2016-12-02 | 2018-06-12 | (주)캐스트프로 | Portable Projector Device |
CN106840121B (en) * | 2017-03-27 | 2023-07-28 | 青岛镭创光电技术有限公司 | Line projector and control method |
CN106840121A (en) * | 2017-03-27 | 2017-06-13 | 青岛镭创光电技术有限公司 | level and control method |
CN108957927A (en) * | 2018-07-19 | 2018-12-07 | 苏州博学智能科技有限公司 | A kind of office projection instrument |
CN110858052A (en) * | 2018-08-23 | 2020-03-03 | 深圳光峰科技股份有限公司 | Projector brightness adjusting system and brightness adjusting method |
KR20200113127A (en) | 2019-03-22 | 2020-10-06 | 주식회사 케이홀로그램 | Image processing system using projector |
KR20220123808A (en) | 2021-03-02 | 2022-09-13 | 조원석 | Projector equipped with cancave asymmetric non-spherical emission lens to improve brightness of image beam and prevent deterioration of lcd display element |
CN113267943B (en) * | 2021-04-20 | 2022-07-08 | 当趣网络科技(杭州)有限公司 | Method for adjusting brightness of standby indicator light, projector and readable storage medium |
CN113267943A (en) * | 2021-04-20 | 2021-08-17 | 当趣网络科技(杭州)有限公司 | Method for adjusting brightness of standby indicator light, projector and readable storage medium |
KR20220158397A (en) * | 2021-05-24 | 2022-12-01 | 주식회사 이수메디 | Chart projector that adjusts the brightness of LED lighting according to the illuminance of the optometry room |
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