CN102866568A - Method and device for adjusting brightness of projector - Google Patents
Method and device for adjusting brightness of projector Download PDFInfo
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- CN102866568A CN102866568A CN2012104116402A CN201210411640A CN102866568A CN 102866568 A CN102866568 A CN 102866568A CN 2012104116402 A CN2012104116402 A CN 2012104116402A CN 201210411640 A CN201210411640 A CN 201210411640A CN 102866568 A CN102866568 A CN 102866568A
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Abstract
An embodiment of the invention discloses a method and a device for adjusting brightness of a projector. The method and the device are used for maintaining display brightness of the projector by adjusting current value. The method includes: calculating an absolute value of difference between a present current brightness value and a target brightness value; if the absolute value of the difference between the present current brightness value and the target brightness value is larger than a first threshold value, judging if the absolute value of the difference between the present current brightness value and the target brightness value is smaller than a second threshold value. On yes judgment, the present current value is adjusted through a gradual fine tuning method; and on no judgment, the present current value is adjusted through a line approximation method. By means of the technical scheme, a three-dimensional relation among the brightness value, the current value and time can be neglected, and the brightness of the projector can be maintained by adjusting current value inside the projector.
Description
Technical field
The present invention relates to the porjector technology field, relate in particular to a kind of projector brightness adjusting method and device.
Background technology
Projector can pass through LED (Light Emitting Diode, light emitting diode) light source with image or video-projection output.An important parameter that affects the projector display effect is brightness, serious luminance deviation can produce demonstration partially secretly, partially bright or colour cast phenomenon.
Projector brightness is relevant with the electric current of the led light source of flowing through, and therefore, usually regulates projector brightness by adjusting current value.When projector brightness is on the low side, can be by tuning up current value so that brightness heighten, when projector brightness is higher, can be by turning current value down so that brightness turn down.
But the corresponding relation of projector current value and brightness value is irregular, and brightness meeting corresponding to same current value is along with led light source is lighted the passing of time and step-down, and the time dependent amplitude of brightness also is irregular.Therefore, in using, reality is difficult to keep by adjusting current value the brightness of projector.
Summary of the invention
In order to address the above problem, the embodiment of the invention provides a kind of projector brightness adjusting method and device, is used for keeping by adjusting current value the display brightness of projector.By implementing technical solution of the present invention, can walk around the three-dimensional relationship between brightness value, current value, the time three, keep the brightness of projector by projector internal adjustment current value.
A kind of projector brightness adjusting method comprises:
Calculate the absolute value of current brightness value and target brightness value difference;
If the absolute value of described current brightness value and target brightness value difference, judges then that whether the absolute value of described current brightness value and target brightness value difference is less than Second Threshold greater than first threshold;
If, then adopt the method for progressively finely tuning that current current value is adjusted, if not, then adopt line approximation that current current value is adjusted.
Preferably, the described employing method of progressively finely tuning comprises current current value adjustment: the magnitude relationship of judging described current brightness value and described target brightness value; If described current brightness value greater than described target brightness value, then is adjusted into current value the difference that described current current value deducts the first adjustment amount gained; If described current brightness value less than described target brightness value, then is adjusted into current value that described current current value adds the second adjustment amount gained and value.
Preferably, described employing line approximation further comprises before current current value is adjusted:
Generate the corresponding table of electric current-brightness, the corresponding table of described electric current-brightness is used for recording known current value and corresponding brightness value thereof, and the corresponding table of described electric current-brightness comprises minimum current value and corresponding brightness value, lowest high-current value and corresponding brightness value thereof thereof at least; Described employing line approximation comprises current current value adjustment: adopt dynamic line approximation that described current current value is adjusted; Or, adopt static line approximation that described current current value is adjusted.
Preferably, the dynamic line approximation of described employing comprises described current current value adjustment: obtain from the corresponding table of described electric current-brightness with the immediate brightness value of described current brightness value and corresponding current value thereof as reference brightness value and reference current value; Calculate target current value corresponding to described target brightness value according to target current value calculating formula, described target current value calculating formula is: target current value=(target brightness value-reference brightness value) ÷ (current brightness value-reference brightness value) * (current current value-reference current value); Current value is adjusted into described target current value.
Preferably, the static line approximation of described employing comprises described current current value adjustment: obtain a fixed slope value according to the corresponding table of described electric current-brightness; Calculate target current value corresponding to described target brightness value according to target current value calculating formula, described target current value calculating formula is: target current value=(target brightness value-current brightness value+fixed slope value * current current value) ÷ fixed slope value; Current value is adjusted into described target current value.
A kind of brightness regulating apparatus comprises:
Computing unit is for the absolute value that calculates current brightness value and target brightness value difference;
The first judging unit, be used for judging the absolute value of described current brightness value and target brightness value difference and the relation of first threshold, if judged result be the absolute value of described current brightness value and target brightness value difference greater than described first threshold, then trigger the second judging unit executable operations;
The second judging unit, judge the absolute value of described current brightness value and target brightness value difference and the relation of Second Threshold, if judged result is that the absolute value of described current brightness value and target brightness value difference is less than described Second Threshold, then trigger the first adjustment unit executable operations, if judged result be the absolute value of described current brightness value and target brightness value difference greater than described Second Threshold, then trigger the second adjustment unit executable operations;
The first adjustment unit is used for adopting the method for progressively finely tuning that current current value is adjusted;
The second adjustment unit is used for adopting line approximation that current current value is adjusted.
Preferably, described the first adjustment unit further comprises: the first judgment sub-unit, be used for judging the magnitude relationship of described current brightness value and described target brightness value, if judged result is that described current brightness value is greater than described target brightness value, then trigger the first fine setting subelement executable operations, if judged result be described current brightness value less than described target brightness value, then trigger the second fine setting subelement executable operations; The first fine setting subelement is used for current value is adjusted into the difference that described current current value deducts the first adjustment amount gained; The second fine setting subelement is used for being adjusted into that described current current value adds the second adjustment amount gained current value and value.
Preferably, described brightness regulating apparatus further comprises: generation unit, be used for generating the corresponding table of electric current-brightness, the corresponding table of described electric current-brightness is used for recording known current value and corresponding brightness value thereof, and the corresponding table of described electric current-brightness comprises minimum current value and corresponding brightness value, lowest high-current value and corresponding brightness value thereof thereof at least; Described the second adjustment unit further comprises: dynamically adjust subelement, be used for adopting dynamic line approximation that described current current value is adjusted; The static adjust subelement is used for adopting static line approximation that described current current value is adjusted.
Preferably, described dynamic adjustment subelement further comprises: first obtains submodule, is used for obtaining with the immediate brightness value of described current brightness value and corresponding current value thereof as reference brightness value and reference current value from the corresponding table of described electric current-brightness; The first calculating sub module, be used for calculating target current value corresponding to described target brightness value according to target current value calculating formula, described target current value calculating formula is: target current value=(target brightness value-reference brightness value) ÷ (current brightness value-reference brightness value) * (current current value-reference current value); First adjusts submodule, is used for current value is adjusted into described target current value.
Preferably, described static adjust subelement further comprises: second obtains submodule, is used for obtaining a fixed slope value according to the corresponding table of described electric current-brightness; The second calculating sub module, be used for calculating target current value corresponding to described target brightness value according to target current value calculating formula, described target current value calculating formula is: target current value=(target brightness value-current brightness value+fixed slope value * current current value) ÷ fixed slope value; Second adjusts submodule, is used for current value is adjusted into described target current value.
As can be seen from the above technical solutions, the embodiment of the invention has the following advantages:
At first calculate the absolute value of current brightness value and target brightness value difference, by judging the magnitude relationship of this absolute value and first threshold, Second Threshold, and then select the method for progressively finely tuning or line approximation that current current value is adjusted, until current brightness value equals target brightness value or difference within acceptable scope.Technical solution of the present invention is walked around the three-dimensional relationship between brightness value in the projector correlation parameter, current value, the time three, and the current brightness of keeping projector by the real-time adjustment of current value is in target brightness level.Improved the display quality of projector.
Description of drawings
Fig. 1 is the projector brightness adjusting method process flow diagram of first embodiment of the invention;
Fig. 2 is the projector brightness adjusting method process flow diagram of second embodiment of the invention;
Fig. 3 is dynamic line approximation synoptic diagram;
Fig. 4 is the projector brightness adjusting method process flow diagram of third embodiment of the invention;
Fig. 5 is static line approximation synoptic diagram;
Fig. 6 is the brightness regulating apparatus structural drawing of fourth embodiment of the invention;
Fig. 7 is the brightness regulating apparatus structural drawing of fifth embodiment of the invention.
Embodiment
Below in conjunction with the Figure of description among the present invention, the technical scheme in the invention is clearly and completely described, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that obtains under the creative work prerequisite.
The embodiment of the invention provides a kind of projector brightness adjusting method, is used for keeping by adjusting current value the display brightness of projector.By implementing technical solution of the present invention, can walk around the three-dimensional relationship between brightness value, current value, the time three, keep the brightness of projector by projector internal adjustment current value.The embodiment of the invention also provides the brightness regulating apparatus relevant with the method, below will be described in detail respectively.
First embodiment of the invention will be elaborated to a kind of projector brightness adjusting method, and the described projector brightness adjusting method of present embodiment idiographic flow sees also Fig. 1, comprises step:
101, calculate the absolute value of current brightness value and target brightness value difference.
Current brightness value can use luminance sensor etc. to obtain, and does not do concrete restriction here.Target brightness value can preset, and can also confirm according to user's needs, does not do concrete restriction here, only thinks that object brightness is a fixed value.In the porjector technology field, brightness value is usually digitized as 8, namely comprises 0～255 rank.
In this step, calculate the absolute value of current brightness value and target brightness value difference, the order of magnitude of this difference can represent that current brightness value is with respect to the deviation oscillation of target brightness value.
102, judge that whether the absolute value of current brightness value and target brightness value difference is less than first threshold.
The magnitude relationship of the absolute value of this difference and first threshold relatively.If the absolute value of current brightness value and target brightness value difference greater than first threshold, then triggers execution in step 103, otherwise does not carry out any operation.
103, judge that whether the absolute value of current brightness value and target brightness value difference is less than Second Threshold.
If the absolute value of current brightness value and target brightness value difference, judges then that whether the absolute value of current brightness value and target brightness value difference is less than Second Threshold greater than first threshold.If the absolute value of current brightness value and target brightness value difference less than Second Threshold, then triggers execution in step 104, if the absolute value of current brightness value and target brightness value difference is not less than Second Threshold, then trigger execution in step 105.
Wherein, first threshold is brightness value allow the to depart from objectives maximal value of brightness value, Second Threshold is taked the boundary brightness of adjustment strategy not of the same race for when current brightness need to be adjusted, and the adjustment strategy in the present embodiment comprises the method for progressively finely tuning and line approximation.Progressively fine setting method is used for fine setting, and line approximation is used for coarse adjustment.
In digitization system, first threshold is generally about 5, and Second Threshold is generally about 10.
104, adopt the method for progressively finely tuning that current current value is adjusted.
If the absolute value of current brightness value and target brightness value difference less than Second Threshold, then adopts the method for progressively finely tuning that current current value is adjusted.
Wherein, progressively the method for finely tuning will describe in follow-up embodiment.
105, adopt line approximation that current current value is adjusted.
If the absolute value of current brightness value and target brightness value difference is not less than Second Threshold, then adopt line approximation that current current value is adjusted.
Wherein, line approximation will describe in follow-up embodiment.
After execution in step 104 or the step 105, again trigger execution in step 101.Until the absolute value of current brightness value and target brightness value difference is less than first threshold.
Preferably, when current current value reaches lowest high-current value, this adjustment flow process also can finish.
In the present embodiment, at first calculate the absolute value of current brightness value and target brightness value difference, by judging the magnitude relationship of this absolute value and first threshold, Second Threshold, and then select the method for progressively finely tuning or line approximation that current current value is adjusted, until current brightness value equals target brightness value or difference within acceptable scope.Technical solution of the present invention is walked around the three-dimensional relationship between brightness value in the projector correlation parameter, current value, the time three, and the current brightness of keeping projector by the real-time adjustment of current value is in target brightness level.Improved the display quality of projector.
Second embodiment of the invention will remark additionally to the described projector brightness adjusting method of the first embodiment.The described projector brightness adjusting method of present embodiment idiographic flow sees also Fig. 2, comprises step:
201, calculate the absolute value of current brightness value and target brightness value difference.
Current brightness value can use luminance sensor etc. to obtain, and does not do concrete restriction here.Target brightness value can preset, and can also confirm according to user's needs, does not do concrete restriction here, only thinks that object brightness is a fixed value.In the present embodiment, brightness value is divided into 0～255 grade, and current value also is divided into 0～255 grade.
In this step, calculate the absolute value of current brightness value and target brightness value difference, the order of magnitude of this difference can represent that current brightness value is with respect to the deviation oscillation of target brightness value.
202, judge that whether the absolute value of current brightness value and target brightness value difference is less than first threshold.
The magnitude relationship of the absolute value of this difference and first threshold relatively.If the absolute value of current brightness value and target brightness value difference greater than first threshold, then triggers execution in step 203, otherwise does not carry out any operation.
203, judge that whether the absolute value of current brightness value and target brightness value difference is less than Second Threshold.
If the absolute value of current brightness value and target brightness value difference, judges then that whether the absolute value of current brightness value and target brightness value difference is less than Second Threshold greater than first threshold.If the absolute value of current brightness value and target brightness value difference less than Second Threshold, then triggers execution in step 204, if the absolute value of current brightness value and target brightness value difference is not less than Second Threshold, then trigger execution in step 207.
Wherein, first threshold is brightness value allow the to depart from objectives maximal value of brightness value, in the present embodiment, first threshold is 5, and Second Threshold is taked the boundary brightness of adjustment strategy not of the same race for when current brightness need to be adjusted, in the present embodiment, Second Threshold is 10.Adjustment strategy in the present embodiment comprises the method for progressively finely tuning and line approximation.Progressively fine setting method is used for fine setting, and line approximation is used for coarse adjustment.
Adopt the method for progressively finely tuning that current current value adjustment be may further comprise the steps 204～206, adopt line approximation that current current value adjustment be may further comprise the steps 208～210.Line approximation comprises: dynamic line approximation and static line approximation, what adopt in the present embodiment is dynamic line approximation.
204, judge the magnitude relationship of current brightness value and target brightness value.
If current brightness value greater than target brightness value, then triggers execution in step 205.If current brightness value less than target brightness value, then triggers execution in step 206.
205, current value is adjusted into the difference that current current value deducts the first adjustment amount gained.
If current brightness value greater than target brightness value, then is adjusted into current value the difference that current current value deducts the first adjustment amount gained, in the present embodiment, the first adjustment amount is 1.
206, current value is adjusted into that current current value adds the second adjustment amount gained and value.
If current brightness value less than target brightness value, then is adjusted into current value that current current value adds the second adjustment amount gained and value, in the present embodiment, the second adjustment amount is 1.
After execution in step 205 or the step 206, again trigger execution in step 201.Until the absolute value of current brightness value and target brightness value difference is less than first threshold.
Preferably, when current current value reaches lowest high-current value, this adjustment flow process also can finish.
207, generate the corresponding table of electric current-brightness.
Wherein, the corresponding table of electric current-brightness is used for recording the relation between known current value and the corresponding brightness value thereof, and when system initialization, the corresponding table of electric current-brightness comprises minimum current value and corresponding brightness value, lowest high-current value and corresponding brightness value thereof thereof at least.
208, from the corresponding table of electric current-brightness, obtain with the immediate brightness value of current brightness value and corresponding current value thereof as reference brightness value and reference current value.
See also Fig. 3, B represents brightness value, and C represents current value, Fig. 3 is electric current-brightness relationship curve map, and wherein, electric current-brightness relationship curve is uncertain in fact, dot in the drawings, when system initialization, minimum current value and corresponding brightness value point (C thereof
Min, B
Min), lowest high-current value and corresponding brightness value point (C thereof
Max, B
Max), current current value and corresponding brightness value point (C, B) thereof.The hypothetical target brightness value is B
t, the impact point on electric current-brightness relationship curve is (C
t, B
t).
From the corresponding table of electric current-brightness, obtain with the immediate brightness value of current brightness value and corresponding current value thereof as reference brightness value and reference current value, in above-mentioned example, (C soon
Min, B
Min) as a reference point (C ', B ').
209, calculate target current value corresponding to target brightness value according to target current value calculating formula.
Wherein, target current value calculating formula is: target current value=(target brightness value-reference brightness value) ÷ (current brightness value-reference brightness value) * (current current value-reference current value).
Accept above-mentioned example, use differential thought, relation in is among a small circle regarded linear relationship as with current value and brightness value, calculate corresponding relation roughly between current value and the brightness value by point (C, B) and point (C ', B '), at point (C, B) and on the straight line at point (C ', B ') place, target brightness value B
tCorresponding current value is C '
t, have:
C′
t＝(B
t-B′)÷(B-B′)×(C-C′)÷(B-B
t)×(C-C′)。
Obtain the target current value C ' of this adjustment
t, as can be known from Fig. 3, point (C '
t, B
t) and point (C
t, B
t) still there is a deviation.
210, current value is adjusted into the target current value.
Accept above-mentioned example, C is adjusted into C '
t, the actual point that obtains at electric current-brightness relationship curve for (C '
t, B '
t), i.e. B '
tBe the brightness value that obtains after this adjustment.As can be known from Fig. 3, point (C '
t, B '
t) and point (C
t, B
t) still there is a deviation.
When current value is adjusted into B '
tAfter, re-execute step 201, namely rejudge B '
tWith B
tRelation.Until B and the absolute value of difference less than first threshold 5.
After the execution in step 210, again trigger execution in step 201.Until the absolute value of current brightness value and target brightness value difference is less than first threshold.
Preferably, when current current value reaches lowest high-current value, this adjustment flow process also can finish.
In the present embodiment, at first calculate the absolute value of current brightness value and target brightness value difference, by judging the magnitude relationship of this absolute value and first threshold, Second Threshold, and then select the method for progressively finely tuning or line approximation that current current value is adjusted, until current brightness value equals target brightness value or difference within acceptable scope.Technical solution of the present invention is walked around the three-dimensional relationship between brightness value in the projector correlation parameter, current value, the time three, and the current brightness of keeping projector by the real-time adjustment of current value is in target brightness level.Improved the display quality of projector.
Third embodiment of the invention will remark additionally to the described projector brightness adjusting method of the first embodiment.The described projector brightness adjusting method of present embodiment idiographic flow sees also Fig. 4, comprises step:
401, calculate the absolute value of current brightness value and target brightness value difference.
402, judge that whether the absolute value of current brightness value and target brightness value difference is less than first threshold.
403, judge that whether the absolute value of current brightness value and target brightness value difference is less than Second Threshold.
404, judge the magnitude relationship of current brightness value and target brightness value.
405, current value is adjusted into the difference that current current value deducts the first adjustment amount gained.
406, current value is adjusted into that current current value adds the second adjustment amount gained and value
407, generate the corresponding table of electric current-brightness.
Step 201 among above step 401～407 and the second embodiment～207 are corresponding one by one, repeat no more here.Step 208 among following steps 408～410 alternative the second embodiment～210 namely use static line approximation to substitute dynamic line approximation.
408, obtain a fixed slope value according to the corresponding table of electric current-brightness.
Wherein, the fixed slope value will continue to continue to use in the adjustment afterwards.The fixed slope value can be minimum current value and corresponding brightness value point (C thereof
Min, B
Min), the slope of the straight line at lowest high-current value and corresponding brightness value point place thereof, the fixing acquisition methods of straight line is not done concrete restriction here.
See also Fig. 5, be electric current-brightness relationship curve map, wherein, electric current-brightness relationship curve is uncertain in fact, dot in the drawings, and when system initialization, minimum current value and corresponding brightness value point (C thereof
Min, B
Min), lowest high-current value and corresponding brightness value point (C thereof
Max, B
Max), current current value and corresponding brightness value point (C, B) thereof.The hypothetical target brightness value is B
t, the impact point on electric current-brightness relationship curve is (C
t, B
t).
Obtain a fixed slope value according to the corresponding table of electric current-brightness, in above-mentioned example, namely obtain fixed slope value k.For example, k=(B
Max-B
Min) ÷ (C
Max-C
Min).
409, calculate target current value corresponding to target brightness value according to target current value calculating formula.
Wherein, target current value calculating formula is: target current value=(target brightness value-current brightness value+fixed slope value * current current value) ÷ fixed slope value.
Accept above-mentioned example, use differential thought, relation in is among a small circle regarded linear relationship as with current value and brightness value, by point (C, B) and fixed slope value k calculate between current value and the brightness value roughly corresponding relation, on point (C, B) and the determined straight line of fixed slope value k, target brightness value B
tCorresponding current value is C '
t, have:
C′
t＝(B
t-B+k×C)÷k。
Obtain the target current value C ' of this adjustment
t, as can be known from Fig. 5, point (C '
t, B
t) and point (C
t, B
t) still there is a deviation.
410, current value is adjusted into the target current value.
Accept above-mentioned example, C is adjusted into C '
t, the actual point that obtains at electric current-brightness relationship curve for (C '
t, B '
t), i.e. B '
tBe the brightness value that obtains after this adjustment.As can be known from Fig. 5, point (C '
t, B '
t) and point (C
t, B
t) still there is a deviation.
When current value is adjusted into B '
tAfter, re-execute step 401, namely rejudge B '
tWith B
tRelation.Until B and the absolute value of difference less than first threshold 5.
After the execution in step 410, again trigger execution in step 401.Until the absolute value of current brightness value and target brightness value difference is less than first threshold.
Preferably, when current current value reaches lowest high-current value, this adjustment flow process also can finish.
The difference of the static line approximation in the present embodiment and the dynamic line approximation of the second embodiment is: in static line approximation, the slope of consult straight line is fixed, and namely is static, and in static line approximation, the slope of consult straight line changes, and namely is dynamic.
In the present embodiment, at first calculate the absolute value of current brightness value and target brightness value difference, by judging the magnitude relationship of this absolute value and first threshold, Second Threshold, and then select the method for progressively finely tuning or line approximation that current current value is adjusted, until current brightness value equals target brightness value or difference within acceptable scope.Technical solution of the present invention is walked around the three-dimensional relationship between brightness value in the projector correlation parameter, current value, the time three, and the current brightness of keeping projector by the real-time adjustment of current value is in target brightness level.Improved the display quality of projector.
Fourth embodiment of the invention will be elaborated to a kind of brightness regulating apparatus, comprise one or more steps that one or more unit are used for realizing preceding method in the described brightness regulating apparatus of present embodiment.Therefore, the description of each step in the preceding method is applicable to corresponding unit in the described brightness regulating apparatus.The brightness regulating apparatus concrete structure of present embodiment sees also Fig. 6, comprising:
Wherein, computing unit 601, the first judging unit 602 and the judging unit 603 of being connected communicate connection successively, and the first adjustment unit 604, the second adjustment unit 605 communicate to connect with the second judging unit 603 respectively.
Current brightness value can use luminance sensor etc. to obtain, and does not do concrete restriction here.Target brightness value can preset, and can also confirm according to user's needs, does not do concrete restriction here, only thinks that object brightness is a fixed value.In the porjector technology field, brightness value is usually digitized as 8, namely comprises 0～255 rank.
In the present embodiment, computing unit 601 calculates the absolute value of current brightness value and target brightness value difference, and the order of magnitude of this difference can represent that current brightness value is with respect to the deviation oscillation of target brightness value.Then, the relatively absolute value of this difference and the magnitude relationship of first threshold of the first judging unit 602.If the absolute value of current brightness value and target brightness value difference, then triggers the second judging unit 603 executable operations greater than first threshold, otherwise do not carry out any operation.
The first judging unit 602, be used for judging the absolute value of current brightness value and target brightness value difference and the relation of first threshold, if judged result is that the absolute value of current brightness value and target brightness value difference is greater than first threshold, then trigger the second judging unit 603 executable operations, otherwise, do not carry out any operation.
The second judging unit 603, judge the absolute value of current brightness value and target brightness value difference and the relation of Second Threshold, if judged result is that the absolute value of current brightness value and target brightness value difference is less than Second Threshold, then trigger the first adjustment unit 604 executable operations, if judged result be the absolute value of current brightness value and target brightness value difference greater than Second Threshold, then trigger the second adjustment unit 605 executable operations.
Wherein, first threshold is brightness value allow the to depart from objectives maximal value of brightness value, and Second Threshold is taked the boundary brightness of adjustment strategy not of the same race for when current brightness need to be adjusted.
Adjustment strategy in the present embodiment comprises the method for progressively finely tuning and line approximation.Progressively fine setting method is used for fine setting, and line approximation is used for coarse adjustment.
The first adjustment unit 604 is used for adopting the method for progressively finely tuning that current current value is adjusted.
Wherein, progressively fine setting method sees also the relevant record among the embodiment of front, repeats no more here.
The second adjustment unit 605 is used for adopting line approximation that current current value is adjusted.
Wherein, line approximation sees also the relevant record among the embodiment of front, repeats no more here.
Preferably, the first judging unit 602 also is used for reaching lowest high-current value when current current value, finishes to adjust flow process.
In the present embodiment, at first computing unit 601 calculates the absolute value of current brightness value and target brightness value difference, magnitude relationship by the first judging unit 602, the second judging unit 603 these absolute values of judgement and first threshold, Second Threshold, and then by the first adjustment unit 604 or the second adjustment unit 605 usefulness progressively finely tune method or line approximation is adjusted current current value, until current brightness value equals target brightness value or difference within acceptable scope.Technical solution of the present invention is walked around the three-dimensional relationship between brightness value in the projector correlation parameter, current value, the time three, and the current brightness of keeping projector by the real-time adjustment of current value is in target brightness level.Improved the display quality of projector.
Fifth embodiment of the invention will remark additionally to the described brightness regulating apparatus of the 4th embodiment, comprise one or more steps that one or more unit are used for realizing preceding method in the described brightness regulating apparatus of present embodiment.Therefore, the description of each step in the preceding method is applicable to corresponding unit in the described brightness regulating apparatus.The described brightness regulating apparatus concrete structure of present embodiment sees also Fig. 7, comprising:
Implement described identical computing unit 701, the first judging unit 702, the second judging unit 703, the first adjustment unit 704 and the second adjustment unit 705 with the 4th, the brightness regulating apparatus of present embodiment further comprises: generation unit 706.
Wherein, computing unit 701, the first judging unit 702 and the judging unit 703 of being connected communicate connection successively, and the first adjustment unit 704, the second adjustment unit 705 and generation unit 706 communicate to connect with the second judging unit 703 respectively.
The first adjustment unit 704 further comprises:
The first judgment sub-unit 7041, be used for judging the magnitude relationship of current brightness value and target brightness value, if judged result is that current brightness value is greater than target brightness value, then trigger the first fine setting subelement 7042 executable operations, if judged result be current brightness value less than target brightness value, then trigger the second fine setting subelement 7043 executable operations.
The first fine setting subelement 7042 is used for current value is adjusted into the difference that current current value deducts the first adjustment amount gained.
The second fine setting subelement 7043 is used for being adjusted into that current current value adds the second adjustment amount gained current value and value.
The second adjustment unit 705 further comprises:
Dynamically adjust subelement 7051, be used for adopting dynamic line approximation that current current value is adjusted.
Static adjust subelement 7052 is used for adopting static line approximation that current current value is adjusted.
Dynamically adjust subelement 7051 and static adjust subelement 7052 and selecting a use in the flow process with once adjusting.
Dynamically adjusting subelement 7051 further comprises:
First obtains submodule 70511, is used for obtaining with the immediate brightness value of current brightness value and corresponding current value thereof as reference brightness value and reference current value from the corresponding table of electric current-brightness.
The first calculating sub module 70512, be used for calculating target current value corresponding to target brightness value according to target current value calculating formula, target current value calculating formula is: target current value=(target brightness value-reference brightness value) ÷ (current brightness value-reference brightness value) * (current current value-reference current value).
First adjusts submodule 70513, is used for current value is adjusted into this target current value.
Static adjust subelement 7052 further comprises:
Second obtains submodule 70521, is used for obtaining a fixed slope value according to the corresponding table of electric current-brightness.
The second calculating sub module 70522, be used for calculating target current value corresponding to target brightness value according to target current value calculating formula, target current value calculating formula is: target current value=(target brightness value-current brightness value+fixed slope value * current current value) ÷ fixed slope value.
Second adjusts submodule 70523, is used for current value is adjusted into this target current value.
About dynamic adjustment subelement 7051 and static adjust subelement 7052 related dynamic line approximation and static line approximation, see also the relevant record of front embodiment, repeat no more here.
One of ordinary skill in the art will appreciate that all or part of step that realizes in above-described embodiment method is to come the relevant hardware of instruction to finish by program, described program can be stored in a kind of computer-readable recording medium, the above-mentioned storage medium of mentioning can be ROM (read-only memory), disk or CD etc.
More than a kind of projector brightness adjusting method provided by the present invention and device are described in detail, for one of ordinary skill in the art, thought according to the embodiment of the invention, all will change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention.
Claims (10)
1. a projector brightness adjusting method is characterized in that, comprising:
Calculate the absolute value of current brightness value and target brightness value difference;
If the absolute value of described current brightness value and target brightness value difference, judges then that whether the absolute value of described current brightness value and target brightness value difference is less than Second Threshold greater than first threshold;
If, then adopt the method for progressively finely tuning that current current value is adjusted, if not, then adopt line approximation that current current value is adjusted.
2. method according to claim 1 is characterized in that, described employing is progressively finely tuned method current current value adjustment is comprised:
Judge the magnitude relationship of described current brightness value and described target brightness value;
If described current brightness value greater than described target brightness value, then is adjusted into current value the difference that described current current value deducts the first adjustment amount gained;
If described current brightness value less than described target brightness value, then is adjusted into current value that described current current value adds the second adjustment amount gained and value.
3. method according to claim 1 and 2 is characterized in that, described employing line approximation further comprises before current current value is adjusted:
Generate the corresponding table of electric current-brightness, the corresponding table of described electric current-brightness is used for recording known current value and corresponding brightness value thereof, and the corresponding table of described electric current-brightness comprises minimum current value and corresponding brightness value, lowest high-current value and corresponding brightness value thereof thereof at least;
Described employing line approximation comprises current current value adjustment:
Adopt dynamic line approximation that described current current value is adjusted;
Or,
Adopt static line approximation that described current current value is adjusted.
4. method according to claim 3 is characterized in that, the dynamic line approximation of described employing comprises described current current value adjustment:
From the corresponding table of described electric current-brightness, obtain with the immediate brightness value of described current brightness value and corresponding current value thereof as reference brightness value and reference current value;
Calculate target current value corresponding to described target brightness value according to target current value calculating formula, described target current value calculating formula is: target current value=(target brightness value-reference brightness value) ÷ (current brightness value-reference brightness value) * (current current value-reference current value);
Current value is adjusted into described target current value.
5. method according to claim 3 is characterized in that, the static line approximation of described employing comprises described current current value adjustment:
Obtain a fixed slope value according to the corresponding table of described electric current-brightness;
Calculate target current value corresponding to described target brightness value according to target current value calculating formula, described target current value calculating formula is: target current value=(target brightness value-current brightness value+fixed slope value * current current value) ÷ fixed slope value;
Current value is adjusted into described target current value.
6. a brightness regulating apparatus is characterized in that, comprising:
Computing unit is for the absolute value that calculates current brightness value and target brightness value difference;
The first judging unit, be used for judging the absolute value of described current brightness value and target brightness value difference and the relation of first threshold, if judged result be the absolute value of described current brightness value and target brightness value difference greater than described first threshold, then trigger the second judging unit executable operations;
The second judging unit, judge the absolute value of described current brightness value and target brightness value difference and the relation of Second Threshold, if judged result is that the absolute value of described current brightness value and target brightness value difference is less than described Second Threshold, then trigger the first adjustment unit executable operations, if judged result be the absolute value of described current brightness value and target brightness value difference greater than described Second Threshold, then trigger the second adjustment unit executable operations;
The first adjustment unit is used for adopting the method for progressively finely tuning that current current value is adjusted;
The second adjustment unit is used for adopting line approximation that current current value is adjusted.
7. brightness regulating apparatus according to claim 6 is characterized in that, described the first adjustment unit further comprises:
The first judgment sub-unit, be used for judging the magnitude relationship of described current brightness value and described target brightness value, if judged result is that described current brightness value is greater than described target brightness value, then trigger the first fine setting subelement executable operations, if judged result be described current brightness value less than described target brightness value, then trigger the second fine setting subelement executable operations;
The first fine setting subelement is used for current value is adjusted into the difference that described current current value deducts the first adjustment amount gained;
The second fine setting subelement is used for being adjusted into that described current current value adds the second adjustment amount gained current value and value.
8. according to claim 6 or 7 described brightness regulating apparatus, it is characterized in that described brightness regulating apparatus further comprises:
Generation unit, be used for generating the corresponding table of electric current-brightness, the corresponding table of described electric current-brightness is used for recording known current value and corresponding brightness value thereof, and the corresponding table of described electric current-brightness comprises minimum current value and corresponding brightness value, lowest high-current value and corresponding brightness value thereof thereof at least;
Described the second adjustment unit further comprises:
Dynamically adjust subelement, be used for adopting dynamic line approximation that described current current value is adjusted;
The static adjust subelement is used for adopting static line approximation that described current current value is adjusted.
9. brightness regulating apparatus according to claim 8 is characterized in that, described dynamic adjustment subelement further comprises:
First obtains submodule, is used for obtaining with the immediate brightness value of described current brightness value and corresponding current value thereof as reference brightness value and reference current value from the corresponding table of described electric current-brightness;
The first calculating sub module, be used for calculating target current value corresponding to described target brightness value according to target current value calculating formula, described target current value calculating formula is: target current value=(target brightness value-reference brightness value) ÷ (current brightness value-reference brightness value) * (current current value-reference current value);
First adjusts submodule, is used for current value is adjusted into described target current value.
10. brightness regulating apparatus according to claim 8 is characterized in that, described static adjust subelement further comprises:
Second obtains submodule, is used for obtaining a fixed slope value according to the corresponding table of described electric current-brightness;
The second calculating sub module, be used for calculating target current value corresponding to described target brightness value according to target current value calculating formula, described target current value calculating formula is: target current value=(target brightness value-current brightness value+fixed slope value * current current value) ÷ fixed slope value;
Second adjusts submodule, is used for current value is adjusted into described target current value.
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| CN201210411640.2A CN102866568B (en) | 2012-10-24 | 2012-10-24 | Method and device for adjusting brightness of projector |
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| CN201210411640.2A CN102866568B (en) | 2012-10-24 | 2012-10-24 | Method and device for adjusting brightness of projector |
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