CN105592278B - Electronic device and projected picture method of adjustment - Google Patents
Electronic device and projected picture method of adjustment Download PDFInfo
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- CN105592278B CN105592278B CN201410562894.3A CN201410562894A CN105592278B CN 105592278 B CN105592278 B CN 105592278B CN 201410562894 A CN201410562894 A CN 201410562894A CN 105592278 B CN105592278 B CN 105592278B
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Abstract
A kind of electronic device of present invention offer and projected picture method of adjustment, electronic device includes projecting cell, ambient light sensor and processing unit.Projecting cell has the side that projection lens is fixedly arranged on electronic device.Ambient light sensor is fixedly arranged on the side of electronic device.Processing unit couples projecting cell and ambient light sensor, and is configured to：The average brightness for controlling the picture of projecting cell projection is the first brightness, and controls ambient light sensor and sense to obtain the first measurement brightness value；The average brightness for controlling the picture of projecting cell projection is the second brightness, and controls ambient light sensor and sense to obtain the second measurement brightness value, wherein the difference of the first brightness and the second brightness is more than threshold values；Brightness value and the second measurement brightness value computing environment contrast are measured according to first；And the projection setting of projecting cell is adjusted according to environmental Comparison degree.
Description
Technical field
The invention relates to a kind of electronic devices, and in particular to a kind of electronic device and projected picture adjustment side
Method.
Background technology
Projection device is increasingly often used in meeting, classroom or family now.However, using projecting apparatus as aobvious
Show purposes, it is necessary to can just clearly appear from dark space.But dim indoor environment also results in various inconvenience.It is basic
The reason is that present projection screen is the plane of a good scattering light, it can be the light in various sources, either from projection
Instrument, or other illuminations or environment light source, all project away toward all directions.So if it is intended to image understands, it is just necessary
Control the light source other than projecting apparatus.Commercially available projecting apparatus is divided into LCD projector and DLP projector.LCD projector uses three pieces
Liquid crystal board is arrived respectively as the image-forming component of Red Green Blue when the light from light source forms monochromatic light through color separation unit
Up to after corresponding liquid crystal board, three pieces liquid crystal board controls the light passed through according to the color of pixel, finally passes through optically focused list
Member projects screen, and the light from three pieces liquid crystal board, which is assembled, generates a pixel.Only there are one DMD imaging sections for DLP projector
Part, for the light from light source after color separation wheel color separation, timesharing reaches DMD, and the rotation of micro mirror on DMD is controlled according to the color of pixel
Turn, three coloured light timesharing reaches screen, generates image.Although DLP projector has preferable contrast, in the influence of environment light source
Under, high contrast may not necessarily be reached.And in order to promote projection quality, user can also be selected by the brightness contrast in projecting apparatus
It manually adjusts.This mode is also more inconvenient for user.
Invention content
A kind of electronic device of present invention offer and projected picture method of adjustment, the light that can reduce context fill electronics
Set the influence of projected picture.
The electronic device of the present invention includes projecting cell, ambient light sensor and processing unit.Projecting cell, which has, to be thrown
Shadow camera lens is fixedly arranged on the side of electronic device, passes through projection lens projected picture.Ambient light sensor is fixedly arranged on electronic device
The side.Processing unit couples projecting cell and ambient light sensor, and is configured to：Control projecting cell projection
The average brightness of picture is the first brightness, and controls ambient light sensor and sense to obtain the first measurement brightness value；Control projection
The average brightness of the picture of unit projection is the second brightness, and controls ambient light sensor and sense to obtain the second measurement brightness
Value, wherein the difference of the first brightness and the second brightness is more than the first threshold values；Brightness value and the second measurement brightness are measured according to first
It is worth computing environment contrast；And a projection setting of projecting cell is adjusted according to environmental Comparison degree.
The projected picture method of adjustment of the present invention is suitable for the electronic device with a projecting cell, including following step
Suddenly.First, it controls with the average brightness of projection image as the first brightness, and senses and obtain the first measurement brightness value.Then, it controls
System with the average brightness of the picture projected be the second brightness, and sense obtain the second measurement brightness value, wherein the first brightness with
The difference of second brightness is more than the first threshold values.Then, brightness value and the second measurement brightness value computing environment pair are measured according to first
Degree of ratio.And the projection setting of projecting cell is adjusted according to environmental Comparison degree.
It, can be by obtaining around current based on above-mentioned, a kind of electronic device of present invention offer and projected picture method of adjustment
The brightness of environment and environmental Comparison degree, to adjust the projection setting of projecting cell.
To make the foregoing features and advantages of the present invention clearer and more comprehensible, special embodiment below, and it is detailed to coordinate attached drawing to make
Carefully it is described as follows.
Description of the drawings
Fig. 1 is the device block diagram of electronic device shown by one embodiment of the invention；
Fig. 2 is the front schematic view of electronic device shown by one embodiment of the invention；
Fig. 3 is the flow chart of projected picture method of adjustment shown by one embodiment of the invention；
Fig. 4 is that one embodiment of the invention is shown when gamma value is equal to 2.2, exports the correspondence of brightness and average brightness
Relational graph.
Reference sign：
10：Electronic device；
110：Projecting cell；
111：Projection lens；
120：Ambient light sensor；
130：Processing unit；
MB1,MB2：Measure brightness value；
IMG：Picture；
S301~S304：Step.
Specific implementation mode
Currently, having projection device has collocation ambient light sensor (ambient light sensor), pass through ambient light
The sensing of sensor and adjust output image quality.Ambient light sensor may be placed at the upper end or front end of projecting apparatus.But
In certain use situations, projecting apparatus is fixedly arranged on by projecting on ceiling, and if at this point, ambient light sensor is arranged on throwing
The upper end of shadow instrument, ambient light sensor i.e. can because of by projecting apparatus put upside down use and correct environment light source brightness can not be measured.
And in certain use situations, the ambient light sensor for being set to front end then may be because too far apart from projection screen and have similar
Ground problem, thereby increases and it is possible to be reflected back the light of projecting apparatus because receiving to be launched by projecting apparatus itself via cloth curtain and ambient light is caused to pass
Sensor can not correct measurement environment light source.
The present invention is then using being attached to brightness of the ambient light sensor of front end on projecting apparatus directly by being reflected from cloth curtain
Value is calculated the light-source brightness around projection device.Also, according to the gamma of the brightness adjustment projection device output measured
It is worth the projections such as (gamma) and color saturation (saturation) setting.In addition, in the present invention, can also be projected by analyzing
The picture material of picture is launched the intensity that the light of ambient light sensor on projecting apparatus is reflexed to through cloth curtain with estimation by projecting apparatus,
To reduce the error of measuring environment light source so that preferable projected image product can be reached in the state of not changing environment light source
Matter.Below then by cooperation embodiment and the attached drawing technical characteristic that the present invention will be described in detail.
Fig. 1 is the device block diagram of electronic device shown by one embodiment of the invention.Fig. 1 is please referred to, electronic device 10 wraps
Include projecting cell 110, ambient light sensor 120 and processing unit 130.There is projecting cell 110 projection lens to be fixedly arranged on electricity
The side of sub-device passes through projection lens projected picture IMG.Ambient light sensor 120 is fixedly arranged on the side of electronic device 10
Face, that is, on side identical with projection lens.
Processing unit 130 couples projecting cell 110 and ambient light sensor 120, and is configured to：Control projection is single
The average brightness of the picture IMG of 110 projection of member is the first brightness, and controls the sensing of ambient light sensor 120 and obtain the first survey
Measure brightness value MB1；The average brightness for controlling the picture IMG that projecting cell 110 projects is the second brightness, and controls ambient light biography
The sensing of sensor 120 obtains the second measurement brightness value MB2, wherein the difference of the first brightness and the second brightness is more than the first threshold values.According to
First measure brightness value MB1 and second measure brightness value MB2 computing environment contrast (Ambient Contrast Ratio,
Abbreviation ACR)；And the projection setting of projecting cell 110 is adjusted according to environmental Comparison degree.
Fig. 2 is the front schematic view of electronic device shown by one embodiment of the invention, wherein electronics fills in this embodiment
It is a projecting apparatus to set 10, but in fact electronic device be alternatively smart mobile phone with projecting cell, laptop or its
He has the electronic device of projecting cell, and the present invention is not limited to above-mentioned.As shown in Fig. 2, ambient light sensor 120 is set
In with the projection lens 111 of projecting cell on the same side of electronic device 10.In such event, ambient light sensor 120
It can be used for sensing and the light reflected to a reflecting object (for example, cloth curtain or wall etc.) synthesis is projected by projection lens 111
Instantly why is the brightness value after environment light source influence arround.
Fig. 3 is the flow chart of projected picture method of adjustment shown by one embodiment of the invention, and the projected picture adjusts
Method is suitable for the electronic device (such as electronic device 10 Fig. 1 and embodiment illustrated in fig. 2) with projecting cell.It please join
According to Fig. 3, first in step S301, control with project a picture average brightness be the first brightness (that is, projection one average brightness
For the picture of the first brightness), and sense (for example, passing through ambient light sensor) and obtain the first measurement brightness value.Then in step
It when rapid S302, controls with the average brightness of the picture projected as the second brightness, and senses and obtain the second measurement brightness value, wherein
The difference of first brightness and the second brightness is more than the first threshold values.Then in step S303, brightness value and the are measured according to first
Two measure brightness value computing environment contrast.And in step S304, the projection of projecting cell is adjusted according to environmental Comparison degree
Setting.
In simple terms, in the present invention, electronic device 10 can be before projecting the required image of user (such as in electricity
When sub-device 10 is switched on), first passing through the measurement of environment light source brightness in advance, (as escribed above first measures brightness value MB1 and the
Two measure brightness value MB2), to obtain environmental Comparison degree.For example, the first above-mentioned brightness is 0, picture IMG at this time is as complete
The image of completely black rank, the second brightness can be then the average brightness of a known image, such as the full white image that brightness is 255, or
Electronic device 10 is shown when booting, including 10 manufacturer's trade mark of electronic device image (if setting the first threshold values as 128,
The average brightness of this image can then be set about between 128 to 255), the present invention is not limited to above-mentioned.
For such embodiment, the first measurement brightness value can then be similar to current environment light source brightness, and second
Measuring brightness value then can be bright plus environment light source equal to light component of the picture that projecting cell 110 is launched after reflecting object reflects
Environment light source brightness and environmental Comparison around current can be thereby calculated in the processing unit 130 of degree, electronic device 10
Degree, and the projection setting of adjustment projecting cell 110 in turn.
For example, environmental Comparison degree ACR may be expressed as following formula (1)：
Wherein, SC (255) is when not considering the environment light source brightness of surrounding, when projecting complete white picture, by ambient light sensing
The brightness value that device 120 can receive, when SC (0) is does not consider that the environment light source brightness of surrounding projects completely black picture, ambient light
The brightness value that sensor 120 can receive, and AL is then current environment light source brightness.So making when in projection all black picture
For picture IMG (that is, the first brightness be equal to 0) when, first measure brightness value MB1 by ambient light sensor 120 receives
It is similar to environment light source brightness AL.And when the complete white picture of projection is as picture (that is, the second brightness is equal to 255), by environment
The second measurement brightness value MB2 that optical sensor 120 receives, that is, be equal to the portion of the molecule (SC (255)+AL) in formula (1)
Point.By the value that the second measurement brightness value MB2 is subtracted to the environment light source brightness AL that SC (255) can be obtained at this time.Pass through
After obtaining the value of environment light source brightness AL, you can bring above-mentioned formula (1) into and obtain environmental Comparison degree ACR.
After environmental Comparison degree ACR is calculated, it can be set according to ACR to adjust the projection of projecting cell 110.?
In the present invention, the described projection setting includes projected gamma value, saturation degree and/or the contrast of picture IMG etc., it is non-only
Only the brightness in projecting cell 110 is adjusted (such as adjusting the power of a light bulb (lamp) in projecting cell 110).?
In the present invention, processing unit 130 judges what kind of scene electronic device 10 is currently in by the size of environmental Comparison degree ACR
In, above-mentioned projection setting is then being adjusted by this scene.
For example, in an embodiment of the present invention, four kinds of scenes, theater have been preset in the processing unit 130 of electronic device 10
(movie theater) scene, home entertaining (home entertainment) scene, workshop's (workshop) scene and
It shows (exhibition) scene, corresponds respectively to environmental Comparison degree ACR and be more than 500：1, between 500：1 and 100：Between 1,
100：1 and 20：Between 1 and less than 20：1 scene situation.And according to above-mentioned four kinds of scenes, processing unit 130 is also preset
Four kinds projection setting, when judge at present be above-mentioned four kinds of scenes for the moment, processing unit 130 be control projecting cell 110 apply mechanically
Corresponding projection setting.And in the present embodiment, the projection setting of above-mentioned four kinds of scenes can refer to shown in the following table 1：
Table 1
Basically, it is handled in more dim scene (such as the theater scene in table 1 and home entertaining scene) single
Member 130 can then set larger gamma value and the weighting of lower color saturation, and in brighter scene (such as in table 1
Workshop's scene and displaying scene), processing unit 130 is then corresponding to set smaller gamma value and higher color saturation
Degree weighting.It is only to illustrate that projection setting shown in table 1 is set forth on but, and the present invention is not limited to above-mentioned, electronic device 10 is set
The person of setting can be according to actual demand, different scenes and corresponding projection setting is arranged.
In addition, for ease of understand, and set in this embodiment (the first brightness be 0, the second brightness be one known to
Value, such as 255), but in fact according to the calculation proposed by the invention for computing environment contrast for, the first brightness
And second brightness it is not absolutely required to be set as above-mentioned numerical value, the setting person of electronic device 10 can then be adjusted as required by
The value of first brightness, the second brightness and the first threshold values.When the first brightness and the second brightness not equal to above-mentioned set 0 with
And when 255, environmental Comparison degree ACR can be still calculated by correcting above-mentioned formula (1), and the present invention is not limited to upper
It states.
And in an embodiment of the present invention, when electronic device 10 starts formally to project the picture IMG needed for user, place
Unit 130 is managed then still the average brightness of the current picture of sustainable analysis and to obtain by projection picture by ambient light sensor 120
Whether the reflecting brightness (that is, monitoring brightness value) that face is reflected to reflecting object is varied from, when variation, which is more than, to be preset (for example,
When the variable quantity for the average brightness that the variable quantity for monitoring brightness value is more than the second threshold values and/or current picture is more than third threshold values),
Processing unit 130 can recalculate environmental Comparison degree ACR by above-mentioned variation, and according to the environment after recalculating
Whether contrast ACR judges whether scene changes, and need to change projection setting in response to the change of scene.
It is and the environmental Comparison degree ACR when average brightness of picture unchanged situation when environment light source brightness changes below
Sample calculation.Assuming that when current picture IMG is full white image, the monitoring brightness that is sensed by ambient light sensor 120
Value SLT may be expressed as：
SLT=SC (255)+AL (2)
When environment light source brightness changes, above formula (2) can be then rewritten as：
SLT'=SC (255)+AL'(3)
At this point, the brightness value SC (255) that the monitoring brightness value SLT' after change is subtracted to complete white picture can be obtained change
Environment light source brightness AL' afterwards, and the environmental Comparison degree ACR' after changing may be expressed as：
On the other hand, it is preset when the variable quantity of monitoring brightness value and the average brightness of picture is all more than (that is, monitoring brightness
The variable quantity of value is more than the second threshold values, and the variable quantity of the average brightness of picture is also simultaneously greater than third threshold values) when, processing is single
Member 130 can then rewrite above-mentioned formula (4) in the variable quantity of the average brightness according further to above-mentioned picture.
It is then when the average brightness of environment light source brightness AL and picture IMG all change, to environmental Comparison below
Spend the sample calculation of ACR.Fig. 4 is according to when gamma value is equal to 2.2, exporting brightness and flat shown by one embodiment of the invention
The correspondence figure of equal brightness.Assuming that the average brightness value of the picture projected at this time is 128, and monitoring brightness value SLT then can be with
It is represented as：
SLT=SC (128)+AL (5)
Wherein, SC (128) is and is passed by ambient light when the average brightness of 110 projection image IMG of projecting cell is 128
The brightness value that sensor 120 can receive.Assuming that the projection setting of projecting cell 110 is the feelings for being equal to 2.2 in gamma value at present
Condition can be estimated by Fig. 4 and be learnt, compared to picture IMG be full white image (brightness value 255) when, the average brightness of picture IMG is
Output brightness when 128 is 0.3 times of above-mentioned full white image.Therefore, it can also estimate, be projected by working as projecting cell 110 herein
When the average brightness of picture IMG is 128, the brightness value SC (128) that can receive by ambient light sensor 120 is also to project
By 0.3 times of the brightness value SC (255) received by ambient light sensor 120 when complete white picture, (that is, SC (128)=0.3*SC
(255))。
In such event, when environment light source changes, at this time by the monitoring brightness value SLT' measured by ambient light sensor 120
It is equal to：
SLT'=SC (128)+AL'(6)
By bringing SC (128) and SC (255) into, above formula (6) is rewritten, you can the environment light source brightness after being changed
AL' is equal to：
AL'=SLT'-SC (128)=SLT'-SC (255) × 0.3 (7)
It brings the result of calculation of formula (7) into formula (4) again and can be obtained the environmental Comparison degree ACR' after changing, and then handle single
Whether member 130 can judge whether scene generates variation according to the environmental Comparison degree ACR' after change, and need to be in response to scene
Change and adjusts projection setting.
In conclusion the present invention provides a kind of electronic device and projected picture method of adjustment, using being attached to projecting apparatus
Directly the light around projection device is calculated by the brightness value reflected from reflecting object in the ambient light sensor of upper front end
Source brightness.Also, it is set according to the projection of the brightness adjustment electronic device measured, such as gamma value (gamma) or color saturation
Degree etc..In addition, in the present invention, the average brightness of the more lasting current projected picture of monitoring of electronic device and arround environment
Light-source brightness when above-mentioned either or both all changes, can also readjust the projection of electronic device in response to above-mentioned variation
Setting so that under the situation of different environment light sources, the projected picture (such as highlights details and dark portion details) of electronic device
All clearly it can be watched and be recognized by user.
Finally it should be noted that：The above embodiments are only used to illustrate the technical solution of the present invention., rather than its limitations；To the greatest extent
Present invention has been described in detail with reference to the aforementioned embodiments for pipe, it will be understood by those of ordinary skill in the art that：Its according to
So can with technical scheme described in the above embodiments is modified, either to which part or all technical features into
Row equivalent replacement；And these modifications or replacements, various embodiments of the present invention technology that it does not separate the essence of the corresponding technical solution
The range of scheme.
Claims (12)
1. a kind of electronic device, which is characterized in that including：
One projecting cell is fixedly arranged on the one side of the electronic device with a projection lens, is drawn by projection lens projection one
Face；
One ambient light sensor is fixedly arranged on the side of the electronic device；And
One processing unit couples the projecting cell and the ambient light sensor, and is configured to：
The average brightness for controlling the picture of projecting cell projection is one first brightness, and controls the ambient light sensor
Sensing obtains one first measurement brightness value；
The average brightness for controlling the picture of projecting cell projection is one second brightness, and controls the ambient light sensor
Sensing obtains one second measurement brightness value, and the difference of wherein first brightness and second brightness is more than one first threshold values；
An environmental Comparison degree is calculated according to the first measurement brightness value and the second measurement brightness value；And
A projection setting of the projecting cell is adjusted according to environmental Comparison degree.
2. electronic device according to claim 1, it is characterised in that：
The processing unit judges a scene according to the environmental Comparison degree, and the projection for adjusting according to the scene projecting cell is set
It is fixed.
3. electronic device according to claim 1, it is characterised in that：
The projection setting of the projecting cell includes gamma value, saturation degree and/or contrast.
4. electronic device according to claim 1, it is characterised in that：
The processing unit continues through the ambient light sensor and obtains a monitoring brightness value, when a variable quantity of monitoring brightness value is big
When second threshold values, which is recalculated according to the monitoring brightness value.
5. electronic device according to claim 4, it is characterised in that：
When the variable quantity of the monitoring brightness value is more than second threshold values, and a variable quantity of the average brightness of the picture
When more than third threshold values, which is recalculated according to the variable quantity of the monitoring brightness value and the average brightness.
6. electronic device according to claim 5, it is characterised in that：
The processing unit acquires the projection list according to the gamma value in the variable quantity of the average brightness and projection setting
One variable quantity of one output brightness of member, the environment is calculated according to the variable quantity of the output brightness and the monitoring brightness value
Contrast.
7. a kind of projected picture method of adjustment is suitable for the electronic device with a projecting cell, which is characterized in that including：
Control senses to project an average brightness of a picture as one first brightness and obtains one first measurement brightness value；
It controls with the average brightness of the picture projected as one second brightness, and senses and obtain one second measurement brightness value,
The difference of wherein first brightness and second brightness is more than one first threshold values；
An environmental Comparison degree is calculated according to the first measurement brightness value and the second measurement brightness value；And
A projection setting of the projecting cell is adjusted according to environmental Comparison degree.
8. projected picture method of adjustment according to claim 7, which is characterized in that described to be somebody's turn to do according to the adjustment of environmental Comparison degree
Projecting cell one projection setting the step of include：
Judge a scene according to the environmental Comparison degree, and adjusts the projection setting of the projecting cell according to the scene.
9. projected picture method of adjustment according to claim 7, it is characterised in that：
Projection setting includes gamma value, saturation degree and/or contrast.
10. projected picture method of adjustment according to claim 7, which is characterized in that the projected picture method of adjustment
It further includes：
It continues through ambient light sensor and obtains a monitoring brightness value, when a variable quantity of monitoring brightness value is more than one second threshold values
When, which is recalculated according to the monitoring brightness value.
11. projected picture method of adjustment according to claim 10, which is characterized in that the projected picture method of adjustment
It further includes：
When the variable quantity of the monitoring brightness value is more than second threshold values, and a variable quantity of the average brightness of the picture
When more than third threshold values, which is recalculated according to the variable quantity of the monitoring brightness value and the average brightness.
12. projected picture method of adjustment according to claim 11, which is characterized in that described to recalculate the environmental Comparison
The step of spending further includes：
An output of the projecting cell is acquired according to the gamma value in the variable quantity of the average brightness and projection setting
The environmental Comparison degree is calculated according to the variable quantity of the output brightness and the monitoring brightness value in one variable quantity of brightness.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106488208B (en) * | 2017-01-03 | 2020-03-31 | 京东方科技集团股份有限公司 | Display device and display method |
| CN109729327B (en) * | 2017-10-31 | 2022-01-28 | 海信视像科技股份有限公司 | Image display method, device and system |
| CN107957293B (en) * | 2017-11-22 | 2020-06-02 | Oppo广东移动通信有限公司 | Ambient light intensity detection method and device, storage medium and electronic equipment |
| CN111258158B (en) * | 2018-11-30 | 2022-10-25 | 中强光电股份有限公司 | Projector and brightness adjusting method |
| CN111754932A (en) | 2019-09-11 | 2020-10-09 | 义明科技股份有限公司 | Electronic device and method for detecting ambient light |
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| CN1353548A (en) * | 2000-11-13 | 2002-06-12 | 台达电子工业股份有限公司 | Intelligent autoamtic brightness contrast and colour compensation system |
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| US7545397B2 (en) * | 2004-10-25 | 2009-06-09 | Bose Corporation | Enhancing contrast |
| US8130184B2 (en) * | 2005-10-21 | 2012-03-06 | Hewlett-Packard Development Company L. P. | Image pixel transformation |
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| CN1353548A (en) * | 2000-11-13 | 2002-06-12 | 台达电子工业股份有限公司 | Intelligent autoamtic brightness contrast and colour compensation system |
| CN1924695A (en) * | 2005-08-29 | 2007-03-07 | Lg电子株式会社 | Method of controlling projection-type display device and projection-type display device using the same |
| CN1991571A (en) * | 2005-12-29 | 2007-07-04 | 联想(北京)有限公司 | Luminance self-adjusting projector and method thereof |
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