CN201464785U - Miniature projector - Google Patents
Miniature projector Download PDFInfo
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- CN201464785U CN201464785U CN2009200736698U CN200920073669U CN201464785U CN 201464785 U CN201464785 U CN 201464785U CN 2009200736698 U CN2009200736698 U CN 2009200736698U CN 200920073669 U CN200920073669 U CN 200920073669U CN 201464785 U CN201464785 U CN 201464785U
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- light
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- photomodulator
- projection machine
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Abstract
The utility model relates to the field of miniature projectors, and discloses a miniature projector which comprises a light modulator, a plurality of light sources, a light sensor and a driving device, wherein the light modulator is used for generating an image; the plurality of light sources are used for irradiating the light modulator; the light sensor is used for sensing the brightness of a working environment; the driving device is used for driving the light sources and the light modulator, and adjusting the brightness of the light sources according to the brightness sensed by the light sensor; the plurality of light sources and the light modulator are fixed on a same light path; and the light sensor is connected with the driving device which is respectively connected with the plurality of light sources and the light modulator. In the utility model, the light sensor is used for sensing the brightness of the working environment, and the brightness of the light sources is adjusted accordingly so as to reduce the power consumption on the premise of basically keeping the display effect. The adjustment of the brightness of the light sources can be realized by changing light source current or changing light source load time, and the maximum reduction amount of light power of the light sources or the light source load time is restricted within 20%.
Description
Technical field
The utility model relates to the minitype projection machine field, particularly the Driving technique of minitype projection machine.
Background technology
Minitype projection machine is a kind of portable unit of similar cigarette case size, and it utilizes the light of certain light quantity that light source sends, and the image that produces in the display device with photomodulator and so on amplifies and projects the place ahead screen.
When such minitype projection machine was applied to the mobile device of mobile phone and so on, because the restriction of battery capacity, can be restricted service time.In order to increase the service time of mobile device, can adopt the way that strengthens battery capacity, but this way can cause the increase of mobile device volume and weight.
Another kind of way is to reduce the power consumption of each parts of mobile device.In each parts, very big as the light engine power consumption of core component in the minitype projection machine, the power consumption that how to reduce light engine is extremely important.Particularly those use the light engine of liquid crystal, and the power consumption of its light source is quite big, so must take to reduce the means of power consumption.
The brightness of present minitype projection machine light source can be adjusted in manual mode, adjusts the brightness that can always be maintained fixed after finishing, up to be adjusted next time.Inventor of the present utility model finds; minitype projection machine is moved under the different scenes through regular meeting and works; and environmental light brightness is likely different under the different scenes, if light engine is operated in different scenes with identical brightness, can cause the problem that valuable electric power is wasted.
Summary of the invention
The purpose of this utility model is to provide a kind of minitype projection machine, at the prerequisite decline low power consumption that guarantees display effect.
For solving the problems of the technologies described above, embodiment of the present utility model provides a kind of minitype projection machine, comprising:
Photomodulator is used to produce the video picture;
A plurality of light sources are used for the irradiates light modulator;
Optical sensor is used to respond to the brightness of working environment;
Drive unit is used for driving light source and photomodulator, adjusts the brightness of light source according to the brightness of optical sensor institute perception;
A plurality of light sources and photomodulator are fixed on the same light path, and optical sensor is connected with drive unit, and drive unit also is connected with photomodulator with each light source respectively.
Embodiment of the present utility model also provides a kind of light source adjustment method of minitype projection machine, may further comprise the steps:
The brightness of induction minitype projection machine working environment;
Adjust the brightness of light source according to the working environment brightness of being responded to.
The utility model embodiment compared with prior art, the key distinction and effect thereof are:
By the brightness of optical sensor perception working environment, and correspondingly adjust the brightness of light source, can be at the basic prerequisite decline low power consumption that keeps display effect.
Further, the maximum reduction of light source light power is limited in 20%, can guarantees that display effect can not influenced significantly.
Further, the maximum reduction of light source load time is limited in 20%, the projection image can not blur the degree that can be identified by the human eye out.
Further, use laser or led light source, be convenient to the adjustment of light-source brightness.
Description of drawings
Fig. 1 is the schematic drawing according to the drive unit of the minitype projection machine of the utility model design;
Fig. 2 is the schematic drawing according to the minitype projection machine structure of the utility model design;
Fig. 3 is a schematic drawing of sequential driving method;
Fig. 4 is the utility model first embodiment midfield sequential synoptic diagram;
Fig. 5 is the utility model second embodiment midfield sequential synoptic diagram;
Fig. 6 is a light source adjustment method schematic flow sheet in the utility model the 3rd embodiment;
Fig. 7 is a light source adjustment method schematic flow sheet in the utility model the 4th embodiment.
Embodiment
In the following description, in order to make the reader understand the application better many ins and outs have been proposed.But, persons of ordinary skill in the art may appreciate that even without these ins and outs with based on the many variations and the modification of following each embodiment, also can realize each claim of the application technical scheme required for protection.
For making the purpose of this utility model, technical scheme and advantage clearer, embodiment of the present utility model is described in further detail below in conjunction with accompanying drawing.
The utility model first embodiment relates to a kind of minitype projection machine.Fig. 2 is the structure schematic drawing according to the minitype projection machine of the utility model design.
As shown in Figure 2, the light of light source (10) irradiation utilizes light collecting lens (20) light harvesting to incide photomodulator (60), and photomodulator (60) by adjusting transmitance or reflectivity, reaches the effect of final image output picture to the light of the fixed amount of incident.The image that photomodulator forms projects screen (50) by projection lens (70) expansion, the image frame that the user is seen form on the screen.In addition, the surrounding enviroment brightness when optical sensor is caught minitype projection machine work passes to drive unit.Drive unit is regulated the light output quantity of light source according to above-mentioned monochrome information.
The video imaging of minitype projection machine projection is on screen, and the user watches the imaging picture of screen reflection, so the brightness meeting of surrounding enviroment influences the quality of image frame during work.This is that contrast descends because the light of minitype projection machine projection arrives the interference that screen is subjected to surrounding enviroment light before.So surrounding enviroment brightness is high more, the brightness of projection light also should be high more, so just can be clear that the image frame of screen reflection.
As a same reason, in the darker place of surrounding enviroment, even the brightness of projection light is not high, the user also can be clear that the image of screen reflection.If, just can reduce overall power consumption so the light output quantity of minitype projection machine can change along with the brightness of surrounding enviroment.
Fig. 1 is the drive unit structure schematic drawing according to the minitype projection machine of the utility model design.
The drive unit of minitype projection machine (30) is by image processor, control integrated circuit (IntegratedCircuit is called for short " IC "), and light source drive (Light Source Driver) constitutes.
Image frame is input to control IC by image processor, control IC plays a part the same with video processor. and control IC the image frame of input is delivered to photomodulator (60) making image, also control light source drive simultaneously to reach the synchronous of above-mentioned image frame and light source luminescent.
The effect of optical sensor is the brightness of surveying surrounding enviroment light, and probe value is sent to control IC.Optical sensor generally uses photodiode (Photo Diode), photodiode is the element that the light of injecting is converted to electric signal, the light quantity that is injected into photodiode can change along with the brightness of surrounding enviroment, the electric current that flows through this photodiode also changes thereupon, thereby can judge peripheral brightness from the size of this electric current.Be appreciated that the optical sensor that also can use other type responds to the brightness of working environment, for example photoelectric cell, photosensitive triode or the like.
The light quantity that light source (10) penetrates is depended in the brightness that projects the image of screen entirely.For minitype projection machine, the light source volume is little, the output light quantity wants high especially.LASER Light Source and light emitting diode (LightEmitting Diode is called for short " LED ") light source is exactly this type of light source.The both is the light source of small size low power consumption, the high light quantity of output.Laser has higher Energy Efficiency Ratio, and LED then has cheap advantage.
Light source in each embodiment of the utility model is R.G.B primitive colours LED or laser.High-pressure sodium lamp that uses in the prior art or fluorescent light are as light source, but high-pressure sodium lamp or fluorescent light are difficult to adjust light quantity, not too are suitable for the utility model.The light quantity of laser or LED is adjusted easily, is applicable to the utility model.
Photomodulator (60) is meant that the light with incident carries out selectivity by, blocking-up or change the element that optical path forms the image picture.The representative instance of photomodulator (60) has Digital Micromirror Device (DigitalMicromirror Device, abbreviation " DMD "), liquid crystal display (Liquid Crystal Display, abbreviation " LCD ") element, liquid crystal on silicon (Liquid Crystal On Silicon is called for short " LCOS ") or the like.
DMD is used in digital light to handle (Digital Light Processing, abbreviation " DLP ") element of projector, it utilizes a type of drive of sequential (field sequential), uses the digital mirror of arranging with the as many matrix form of pixel quantity (DIGITAL MIRROR).DLP is meant that the light that goes out from light source irradiation regulates optical path with digital mirror, and reflects the projector that reaches gradual change (Gradation) or form image with dividing plate.
Liquid crystal display cells (LCD) is meant that optionally the ON/OFF liquid crystal forms visual element.Use in the projector of LCD element, direct viewing type (direct-view), porjection type and reflection-type are arranged.The direct viewing type projection is that the bias light of liquid crystal display cells back forms image and mode that can Direct observation by the LCD panel; The porjection type projection is to project screen after the image that will form by liquid crystal display cells utilizes projection lens to amplify, and observes from the mode of the image of screen reflection; The structure of reflection-type and porjection type is basic identical, and the difference part is that reflection-type is provided with reflectance coating on the substrate below LCD, and the light of reflection is exaggerated and projects on the screen.
LCOS belongs to reflective liquid crystal and shows, it in the past the lower substrate in the two sides substrate of liquid crystal display end change silicon substrate into by transparent glass, thereby operate with the reflection-type mode.
Above-mentioned photomodulator is divided into monochromatic type and color-type.Monochromatic type is respectively installed a photomodulator in order to embody color on three primary colors, thereby needs three photomodulators.Monochromatic type photomodulator has advantage relatively simple for structure.
The color-type photomodulator only uses a photomodulator, and its adopts the time is divided into the driving method of field sequential of trisection, thus do not need 3 monochrome light modulator, but complex structure, make relatively more difficult.Can diminish because only use the light engine volume of a photomodulator, integral body, so be well suited for being used for the minitype projection machine of each embodiment of the utility model.
Micro projection machine actuating device in the utility model embodiment is applicable to above-mentioned all photomodulators.
Fig. 3 is the schematic drawing of a sequential driving mode.As shown in Figure 3, a sequential driving mode is frame time (Frame time) 3 five equilibriums, is divided into the subframe of each Red (red)/Green (green)/Blue (indigo plant), drives the display mode of different colours data in the time of each subframe respectively.
This type of drive is as cartoon, shows a plurality of pictures with frame rate fast, utilizes ghost to reach the effect of continuous smoothness.Utilize in the form and aspect 3 primary colors to watch, just can embody color mixture with frame rate fast.
The frame interval is divided into three subframes in Fig. 3, but three intervals and the subframes of R/G/B are also inconsistent, but the spacing of t time is arranged.
Spacing t is that photomodulator is deleted the image of former frame in the memory, the image data of each primary colors of correspondence of new frame is saved in the time of memory.In the subframe interval, except above-mentioned time t, actual exactly each corresponding trichromatic system is made time of image, in the utility model embodiment being called load (Duty) during this period of time.
Photomodulator is only made image between load region, so that light source will be worked in coordination with between load region is luminous.The light that sends in the t interval is because can reduce the contrast of image, so will block.
As shown in Figure 3, the tetragonal height between load region is a luminous power.So the quadrilateral area of expression load is proportional among the light quantity of exporting between load region and Fig. 4.Wide more luminous power is big more between load region in other words, and the amount of light output can increase, otherwise can reduce.In general, three loads of R/G/B interval sum that respectively will load 30%, 3 t of entire frame time will reach about 10% of the entire frame time.
In the present embodiment, photomodulator during with the field sequential mode drive, drive unit is adjusted the brightness of light source by the load time length that changes light source, as shown in Figure 4, the zone of Fig. 4 bend shade is to go up by the load after the reduction time on sequential.
Change and maximumly under the situation that load reduces light quantity to reduce 20% for well, this is can blur the degree that human eye can be discerned because reduce by 20% image that throws when above.During the complete deepening of surrounding enviroment 24% of R/G/B load meeting framing interval of all kinds.The load minimizing means the light source works time of all kinds to R/G/B (on time) minimizing, and the load of each primary colors reduces to 24% by 30% of the full frame time.The power consumption meeting reduces about 20% thereupon.
The utility model second embodiment relates to a kind of minitype projection machine.Second embodiment and first embodiment are basic identical, and difference mainly is:
In the first embodiment, drive unit is adjusted the brightness of light source by the load time length that changes light source.
Yet in second embodiment, drive unit is adjusted the brightness of light source by the input current size that changes light source.The input current size has directly determined the size of luminous power.As shown in Figure 5, the zone of Fig. 5 bend shade is the load after luminous power is lowered on sequential.
The output quantity of light source can reduce by the magnitude of current of less input, and luminous power is maximum during the complete deepening of surrounding enviroment reduces 20% for well, the same with load, surpasses 20% bluring of projection image most and will reach the degree that human eye can be discerned if reduce.
In other embodiment of the present utility model, can also change the load time length of light source and the input current size of light source simultaneously, the adjusting range of the input current size of the load time length of light source and light source will be controlled more modestly at this moment, reduces excessive situation in order to avoid the brightness of projection image occurs.
The utility model the 3rd embodiment relates to a kind of light source adjustment method of minitype projection machine, and its flow process as shown in Figure 6.
In step 601, minitype projection machine is by the brightness of optical sensor induction work at present environment.
After this enter step 602, according to the targeted loads value of the brightness calculation light source that records.Specifically the dark more targeted loads value of working environment is low more, but might not be linear relationship between the two, and the maximum reduction of light source load time is 20% of the nominal load time, throws image like this and can not blur the degree that can be identified by the human eye out.
After this enter step 603, the load of light source is adjusted into the targeted loads value. after this get back to the adjustment that step 601 is carried out next cycle.
Step 602 and step 603 have realized adjusting according to the working environment brightness of being responded to the brightness of light source, promptly adjust the brightness of light source by the load time length that changes light source.
Present embodiment is and the corresponding method embodiment of first embodiment, present embodiment can with the enforcement of working in coordination of first embodiment.The correlation technique details of mentioning in first embodiment is still effective in the present embodiment, in order to reduce repetition, repeats no more here.Correspondingly, the correlation technique details of mentioning in the present embodiment also can be applicable in first embodiment.
The utility model the 4th embodiment relates to a kind of light source adjustment method of minitype projection machine, and its flow process as shown in Figure 7.
In step 701, minitype projection machine is by the brightness of optical sensor induction working environment.
After this enter step 702, according to the target current value of the brightness calculation light source that records.Specifically the dark more target current value of working environment is low more, but might not be linear relationship between the two, and the maximum reduction of light source light power is 20% of normal light power, throws image like this and can not blur the degree that can be identified by the human eye out.
After this enter step 703, the electric current of light source is adjusted into the target current value.After this get back to the adjustment that step 701 is carried out next cycle.
Step 702 and step 703 have realized adjusting according to the working environment brightness of being responded to the brightness of light source, promptly adjust the brightness of light source by the size of current that changes light source.
Present embodiment is and the corresponding method embodiment of second embodiment, present embodiment can with the enforcement of working in coordination of second embodiment.The correlation technique details of mentioning in second embodiment is still effective in the present embodiment, in order to reduce repetition, repeats no more here.Correspondingly, the correlation technique details of mentioning in the present embodiment also can be applicable in second embodiment.
Method embodiment of the present utility model can be realized in software, hardware, firmware or the like mode.No matter the utility model be with software, hardware, or the firmware mode realize, instruction code can be stored in the storer of computer-accessible of any kind (for example permanent or revisable, volatibility or non-volatile, solid-state or non-solid-state, medium fixing or that change or the like).Equally, storer can for example be programmable logic array (Programmable Array Logic, be called for short " PAL "), random access memory (Random Access Memory, be called for short " RAM "), programmable read only memory (Programmable Read Only Memory, be called for short " PROM "), ROM (read-only memory) (Read-Only Memory, be called for short " ROM "), Electrically Erasable Read Only Memory (Electrically Erasable Programmable ROM, be called for short " EEPROM "), disk, CD, digital versatile disc (Digital Versatile Disc is called for short " DVD ") or the like.
Though by reference some preferred embodiment of the present utility model, the utility model is illustrated and describes, but those of ordinary skill in the art should be understood that and can do various changes to it in the form and details, and do not depart from spirit and scope of the present utility model.
Claims (7)
1. a minitype projection machine is characterized in that, comprising:
Photomodulator is used to produce the video picture;
A plurality of light sources are used to shine described photomodulator;
Optical sensor is used to respond to the brightness of working environment;
Drive unit is used to drive described light source and photomodulator, adjusts the brightness of described light source according to the brightness of described optical sensor institute perception;
Described a plurality of light source and photomodulator are fixed on the same light path, and described optical sensor is connected with described drive unit, and described drive unit also is connected with photomodulator with described a plurality of light sources respectively.
2. minitype projection machine according to claim 1 is characterized in that, the maximum reduction of described light source light power is 20% of a normal light power.
3. minitype projection machine according to claim 1 is characterized in that, described photomodulator during with the field sequential mode drive.
4. minitype projection machine according to claim 1 is characterized in that, the maximum reduction of described light source load time is 20% of the nominal load time.
5. according to each described minitype projection machine in the claim 1 to 4, it is characterized in that described optical sensor is a photodiode.
6. according to each described minitype projection machine in the claim 1 to 4, it is characterized in that described photomodulator is one of following:
Liquid crystal display cells, Digital Micromirror Device, liquid crystal on silicon.
7. according to each described minitype projection machine in the claim 1 to 4, it is characterized in that described light source comprises LASER Light Source or light emitting diode light source.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009200736698U CN201464785U (en) | 2009-03-06 | 2009-03-06 | Miniature projector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009200736698U CN201464785U (en) | 2009-03-06 | 2009-03-06 | Miniature projector |
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| Publication Number | Publication Date |
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| CN201464785U true CN201464785U (en) | 2010-05-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009200736698U Expired - Fee Related CN201464785U (en) | 2009-03-06 | 2009-03-06 | Miniature projector |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101976012A (en) * | 2010-09-16 | 2011-02-16 | 青岛海信电器股份有限公司 | Method and device for regulating brightness of light source as well as laser projection equipment |
| CN102662300A (en) * | 2012-05-16 | 2012-09-12 | 江苏宜清光电科技有限公司 | Projector of optical sensor |
| CN103744258A (en) * | 2014-01-17 | 2014-04-23 | 深圳市矽韦氏科技有限公司 | Head-up display method and system |
| WO2019214147A1 (en) * | 2018-05-09 | 2019-11-14 | 歌尔股份有限公司 | Multi-laser drive current correction method and apparatus, and laser projector |
-
2009
- 2009-03-06 CN CN2009200736698U patent/CN201464785U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101976012A (en) * | 2010-09-16 | 2011-02-16 | 青岛海信电器股份有限公司 | Method and device for regulating brightness of light source as well as laser projection equipment |
| CN102662300A (en) * | 2012-05-16 | 2012-09-12 | 江苏宜清光电科技有限公司 | Projector of optical sensor |
| CN103744258A (en) * | 2014-01-17 | 2014-04-23 | 深圳市矽韦氏科技有限公司 | Head-up display method and system |
| CN103744258B (en) * | 2014-01-17 | 2016-01-20 | 深圳点石创新科技有限公司 | A kind of head-up display method and system |
| WO2019214147A1 (en) * | 2018-05-09 | 2019-11-14 | 歌尔股份有限公司 | Multi-laser drive current correction method and apparatus, and laser projector |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: Na Sainuo science and technology (Jurong) company limited Assignor: Shanghai Sanxin Technology Development Co., Ltd. Contract record no.: 2011310000040 Denomination of utility model: Optical engine for micro projector Granted publication date: 20100512 License type: Exclusive License Record date: 20110408 |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100512 Termination date: 20150306 |
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| EXPY | Termination of patent right or utility model |