CN102866568B - Method and device for adjusting brightness of projector - Google Patents
Method and device for adjusting brightness of projector Download PDFInfo
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- CN102866568B CN102866568B CN201210411640.2A CN201210411640A CN102866568B CN 102866568 B CN102866568 B CN 102866568B CN 201210411640 A CN201210411640 A CN 201210411640A CN 102866568 B CN102866568 B CN 102866568B
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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 porjector technology field, particularly relate to a kind of projector brightness control method and device.
Background technology
Projecting apparatus can pass through LED (Light Emitting Diode, light-emitting diode) light source and image or video-projection be exported.The important parameter affecting projecting apparatus display effect is brightness, serious luminance deviation can produce display partially secretly, partially bright or colour cast phenomenon.
Projector brightness is relevant to the electric current flowing through LED light source, therefore, usually regulates projector brightness by adjustment current value.When projector brightness is on the low side, brightness can being heightened by tuning up current value, when projector brightness is higher, brightness can being turned down by turning current value down.
But the corresponding relation of projecting apparatus current value and brightness value is irregular, step-down is understood along with the passing of LED light source lighting time in the brightness that same current value is corresponding, and the time dependent amplitude of brightness is also irregular.Therefore, in reality uses, the brightness being maintained projecting apparatus by adjustment current value is difficult to.
Summary of the invention
In order to solve the problem, embodiments provide a kind of projector brightness control method and device, for being maintained the display brightness of projecting apparatus by adjustment current value.By implementing technical solution of the present invention, the three-dimensional relationship between brightness value, current value, time three can be walked around, maintained the brightness of projecting apparatus by projecting apparatus internal adjustment current value.
A kind of projector brightness control method, comprising:
Calculate the absolute value of present intensity value and target brightness value difference;
If the absolute value of described present intensity value and target brightness value difference is greater than first threshold, then judge whether the absolute value of described present intensity value and target brightness value difference is less than Second Threshold;
If so, then adopt method of progressively finely tuning to adjust present current value, if not, then adopt line approximation to adjust present current value.
Preferably, described employing method of progressively finely tuning is carried out adjustment to present current value and is comprised: the magnitude relationship judging described present intensity value and described target brightness value; If described present intensity value is greater than described target brightness value, then current value is adjusted to the difference that described present current value deducts the first adjustment amount gained; If described present intensity value is less than described target brightness value, then current value is adjusted to that described present current value adds the second adjustment amount gained and value.
Preferably, described employing line approximation comprises taking a step forward of adjusting of present current value:
Generate current versus brightness correspondence table, described current versus brightness correspondence table is for recording known current value and corresponding brightness value thereof, and described current versus brightness correspondence table at least comprises the brightness value of the brightness value of minimum current value and correspondence thereof, lowest high-current value and correspondence thereof; Described employing line approximation is carried out adjustment to present current value and is comprised: adopt dynamic line approximation to adjust described present current value; Or, adopt static line approximation to adjust described present current value.
Preferably, the dynamic line approximation of described employing is carried out adjustment to described present current value and is comprised: obtain from described current versus brightness correspondence table with the immediate brightness value of described present intensity 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) ÷ (present intensity value-reference brightness value) × (present current value-reference current value); Current value is adjusted to described target current value.
Preferably, the static line approximation of described employing is carried out adjustment to described present current value and is comprised: according to described current versus brightness correspondence table acquisition one fixed slope 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-present intensity value+fixed slope value × present current value) ÷ fixed slope value; Current value is adjusted to described target current value.
A kind of brightness regulating apparatus, comprising:
Computing unit, for calculating the absolute value of present intensity value and target brightness value difference;
First judging unit, for judging described present intensity value and the absolute value of target brightness value difference and the relation of first threshold, if judged result is the absolute value of described present intensity value and target brightness value difference be greater than described first threshold, then trigger the second judging unit executable operations;
Second judging unit, judge described present intensity value and the absolute value of target brightness value difference and the relation of Second Threshold, if judged result is the absolute value of described present intensity value and target brightness value difference be less than described Second Threshold, then trigger the first adjustment unit executable operations, if judged result is the absolute value of described present intensity value and target brightness value difference be greater than described Second Threshold, then trigger the second adjustment unit executable operations;
First adjustment unit, adjusts present current value for adopting method of progressively finely tuning;
Second adjustment unit, adjusts present current value for adopting line approximation.
Preferably, described first adjustment unit comprises further: the first judgment sub-unit, for judging the magnitude relationship of described present intensity value and described target brightness value, if judged result is described present intensity value be greater than described target brightness value, then trigger the first fine setting subelement executable operations, if judged result is described present intensity value be less than described target brightness value, then trigger the second fine setting subelement executable operations; First fine setting subelement, deducts the difference of the first adjustment amount gained for current value being adjusted to described present current value; Second fine setting subelement, for being adjusted to that described present current value adds the second adjustment amount gained and value by current value.
Preferably, described brightness regulating apparatus comprises further: generation unit, for generating current versus brightness correspondence table, described current versus brightness correspondence table is for recording known current value and corresponding brightness value thereof, and described current versus brightness correspondence table at least comprises the brightness value of the brightness value of minimum current value and correspondence thereof, lowest high-current value and correspondence thereof; Described second adjustment unit comprises further: dynamic conditioning subelement, adjusts described present current value for adopting dynamic line approximation; Static adjust subelement, adjusts described present current value for adopting static line approximation.
Preferably, described dynamic conditioning subelement comprises further: first obtains submodule, for obtaining from described current versus brightness correspondence table with the immediate brightness value of described present intensity value and corresponding current value thereof as reference brightness value and reference current value; First calculating sub module, 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) ÷ (present intensity value-reference brightness value) × (present current value-reference current value); First adjustment submodule, for being adjusted to described target current value by current value.
Preferably, described static adjust subelement comprises further: second obtains submodule, for showing acquisition one fixed slope value according to described current versus brightness correspondence; Second calculating sub module, 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-present intensity value+fixed slope value × present current value) ÷ fixed slope value; Second adjustment submodule, for being adjusted to described target current value by current value.
As can be seen from the above technical solutions, the embodiment of the present invention has the following advantages:
First the absolute value of present intensity value and target brightness value difference is calculated, by judging the magnitude relationship of this absolute value and first threshold, Second Threshold, and then select and progressively finely tune method or line approximation and adjust present current value, until present intensity value equals target brightness value or difference within acceptable scope.Technical solution of the present invention walks around the three-dimensional relationship between brightness value in projecting apparatus relevant parameter, current value, time three, and the present intensity being maintained projecting apparatus by the real-time adjustment of current value is in target brightness level.Improve the display quality of projecting apparatus.
Accompanying drawing explanation
Fig. 1 is the projector brightness control method flow chart of first embodiment of the invention;
Fig. 2 is the projector brightness control method flow chart of second embodiment of the invention;
Fig. 3 is dynamic line approximation schematic diagram;
Fig. 4 is the projector brightness control method flow chart of third embodiment of the invention;
Fig. 5 is static line approximation schematic diagram;
Fig. 6 is the brightness regulating apparatus structure chart of fourth embodiment of the invention;
Fig. 7 is the brightness regulating apparatus structure chart of fifth embodiment of the invention.
Embodiment
Below in conjunction with the Figure of description in the present invention, be clearly and completely described the technical scheme in invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
Embodiments provide a kind of projector brightness control method, for being maintained the display brightness of projecting apparatus by adjustment current value.By implementing technical solution of the present invention, the three-dimensional relationship between brightness value, current value, time three can be walked around, maintained the brightness of projecting apparatus by projecting apparatus internal adjustment current value.The embodiment of the present invention also provides the brightness regulating apparatus relevant to the method, will be described in detail respectively below.
First embodiment of the invention will be described in detail to a kind of projector brightness control method, and the projector brightness control method idiographic flow described in the present embodiment refers to Fig. 1, comprises step:
101, the absolute value of present intensity value and target brightness value difference is calculated.
Present intensity value can use the acquisitions such as luminance sensor, does not do concrete restriction here.Target brightness value can preset, and can also need to confirm according to user, not do concrete restriction here, only think that object brightness is a fixed value.In porjector technology field, brightness value is usually digitized as 8, namely comprises 0 ~ 255 rank.
In this step, calculate the absolute value of present intensity value and target brightness value difference, the order of magnitude of this difference can represent the deviation oscillation of present intensity value relative to target brightness value.
102, judge whether the absolute value of present intensity value and target brightness value difference is less than first threshold.
The relatively absolute value of this difference and the magnitude relationship of first threshold.If the absolute value of present intensity value and target brightness value difference is greater than first threshold, then triggers and perform step 103, otherwise do not carry out any operation.
103, judge whether the absolute value of present intensity value and target brightness value difference is less than Second Threshold.
If the absolute value of present intensity value and target brightness value difference is greater than first threshold, then judge whether the absolute value of present intensity value and target brightness value difference is less than Second Threshold.If the absolute value of present intensity value and target brightness value difference is less than Second Threshold, then triggers and perform step 104, if the absolute value of present intensity value and target brightness value difference is not less than Second Threshold, then triggers and perform step 105.
Wherein, first threshold is the maximum that brightness value allows to depart from target brightness value, when Second Threshold is for needing to adjust when present intensity, take the boundary brightness of adjustable strategies not of the same race, the adjustable strategies in the present embodiment comprises progressively finely tunes method and line approximation.Method of progressively finely tuning 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, method of progressively finely tuning is adopted to adjust present current value.
If the absolute value of present intensity value and target brightness value difference is less than Second Threshold, then method of progressively finely tuning is adopted to adjust present current value.
Wherein, method of progressively finely tuning is described in follow-up embodiment.
105, line approximation is adopted to adjust present current value.
If the absolute value of present intensity value and target brightness value difference is not less than Second Threshold, then line approximation is adopted to adjust present current value.
Wherein, line approximation is described in follow-up embodiment.
After performing step 104 or step 105, again trigger and perform step 101.Until the absolute value of present intensity value and target brightness value difference is less than first threshold.
Preferably, when present current value reaches lowest high-current value, this adjustment flow process also can terminate.
In the present embodiment, first the absolute value of present intensity value and target brightness value difference is calculated, by judging the magnitude relationship of this absolute value and first threshold, Second Threshold, and then select and progressively finely tune method or line approximation and adjust present current value, until present intensity value equals target brightness value or difference within acceptable scope.Technical solution of the present invention walks around the three-dimensional relationship between brightness value in projecting apparatus relevant parameter, current value, time three, and the present intensity being maintained projecting apparatus by the real-time adjustment of current value is in target brightness level.Improve the display quality of projecting apparatus.
Second embodiment of the invention remarks additionally to the projector brightness control method described in the first embodiment.Projector brightness control method idiographic flow described in the present embodiment refers to Fig. 2, comprises step:
201, the absolute value of present intensity value and target brightness value difference is calculated.
Present intensity value can use the acquisitions such as luminance sensor, does not do concrete restriction here.Target brightness value can preset, and can also need to confirm according to user, not do concrete restriction here, only think that object brightness is a fixed value.In the present embodiment, brightness value is divided into 0 ~ 255 grade, and current value is also divided into 0 ~ 255 grade.
In this step, calculate the absolute value of present intensity value and target brightness value difference, the order of magnitude of this difference can represent the deviation oscillation of present intensity value relative to target brightness value.
202, judge whether the absolute value of present intensity value and target brightness value difference is less than first threshold.
The relatively absolute value of this difference and the magnitude relationship of first threshold.If the absolute value of present intensity value and target brightness value difference is greater than first threshold, then triggers and perform step 203, otherwise do not carry out any operation.
203, judge whether the absolute value of present intensity value and target brightness value difference is less than Second Threshold.
If the absolute value of present intensity value and target brightness value difference is greater than first threshold, then judge whether the absolute value of present intensity value and target brightness value difference is less than Second Threshold.If the absolute value of present intensity value and target brightness value difference is less than Second Threshold, then triggers and perform step 204, if the absolute value of present intensity value and target brightness value difference is not less than Second Threshold, then triggers and perform step 207.
Wherein, first threshold is the maximum that brightness value allows to depart from target brightness value, in the present embodiment, first threshold is 5, when Second Threshold is for needing to adjust when present intensity, takes the boundary brightness of adjustable strategies not of the same race, in the present embodiment, Second Threshold is 10.Adjustable strategies in the present embodiment comprises progressively finely tunes method and line approximation.Method of progressively finely tuning is used for fine setting, and line approximation is used for coarse adjustment.
Adopt method of progressively finely tuning to carry out adjustment to present current value and comprise the following steps 204 ~ 206, adopt line approximation to carry out adjustment to present current value and comprise the following steps 208 ~ 210.Line approximation comprises: dynamically line approximation and static line approximation, and what adopt in the present embodiment is dynamic line approximation.
204, the magnitude relationship of present intensity value and target brightness value is judged.
If present intensity value is greater than target brightness value, then triggers and perform step 205.If present intensity value is less than target brightness value, then triggers and perform step 206.
205, current value is adjusted to the difference that present current value deducts the first adjustment amount gained.
If present intensity value is greater than target brightness value, then current value is adjusted to the difference that present current value deducts the first adjustment amount gained, in the present embodiment, the first adjustment amount is 1.
206, current value is adjusted to that present current value adds the second adjustment amount gained and value.
If present intensity value is less than target brightness value, then current value is adjusted to that present current value adds the second adjustment amount gained and value, in the present embodiment, the second adjustment amount is 1.
After performing step 205 or step 206, again trigger and perform step 201.Until the absolute value of present intensity value and target brightness value difference is less than first threshold.
Preferably, when present current value reaches lowest high-current value, this adjustment flow process also can terminate.
207, current versus brightness correspondence table is generated.
Wherein, current versus brightness correspondence table is for recording the relation between known current value and corresponding brightness value thereof, and when system initialization, current versus brightness correspondence table at least comprises the brightness value of the brightness value of minimum current value and correspondence thereof, lowest high-current value and correspondence thereof.
208, obtain with the immediate brightness value of present intensity value and corresponding current value thereof as reference brightness value and reference current value from current versus brightness correspondence table.
Refer to Fig. 3, B represents brightness value, and C represents current value, Fig. 3 is current versus brightness graph of relation, and wherein, current versus brightness relation curve is uncertain in fact, represented by dashed line in the drawings, when system initialization, the brightness value point (C of minimum current value and correspondence thereof
min, B
min), the brightness value point (C of lowest high-current value and correspondence thereof
max, B
max), brightness value point (C, B) of present current value and correspondence thereof.Hypothetical target brightness value is B
t, the impact point on current versus brightness relation curve is (C
t, B
t).
Obtain with the immediate brightness value of present intensity value and corresponding current value thereof as with reference to brightness value and reference current value from current versus brightness correspondence table, in the above example, by (C
min, B
min) as a reference point (C ', B ').
209, target current value corresponding to target brightness value is calculated according to target current value calculating formula.
Wherein, target current value calculating formula is: target current value=(target brightness value-reference brightness value) ÷ (present intensity value-reference brightness value) × (present current value-reference current value).
Accept above-mentioned example, use differential thought, current value and brightness value is regarded as linear relationship in the relation among a small circle, by point (C, B) and point (C ', B ') corresponding relation roughly between calculating current value and brightness value, 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 deviation.
210, current value is adjusted to target current value.
Accept above-mentioned example, C is adjusted to C '
t, the actual point obtained at current versus brightness relation curve for (C '
t, B '
t), i.e. B '
tfor the brightness value obtained after this adjustment.As can be known from Fig. 3, point (C '
t, B '
t) and point (C
t, B
t) still there is deviation.
When current value is adjusted to B '
tafter, re-execute step 201, namely rejudge B '
twith B
trelation.Until B and the absolute value of difference be less than first threshold 5.
After performing step 210, again trigger and perform step 201.Until the absolute value of present intensity value and target brightness value difference is less than first threshold.
Preferably, when present current value reaches lowest high-current value, this adjustment flow process also can terminate.
In the present embodiment, first the absolute value of present intensity value and target brightness value difference is calculated, by judging the magnitude relationship of this absolute value and first threshold, Second Threshold, and then select and progressively finely tune method or line approximation and adjust present current value, until present intensity value equals target brightness value or difference within acceptable scope.Technical solution of the present invention walks around the three-dimensional relationship between brightness value in projecting apparatus relevant parameter, current value, time three, and the present intensity being maintained projecting apparatus by the real-time adjustment of current value is in target brightness level.Improve the display quality of projecting apparatus.
Third embodiment of the invention remarks additionally to the projector brightness control method described in the first embodiment.Projector brightness control method idiographic flow described in the present embodiment refers to Fig. 4, comprises step:
401, the absolute value of present intensity value and target brightness value difference is calculated.
402, judge whether the absolute value of present intensity value and target brightness value difference is less than first threshold.
403, judge whether the absolute value of present intensity value and target brightness value difference is less than Second Threshold.
404, the magnitude relationship of present intensity value and target brightness value is judged.
405, current value is adjusted to the difference that present current value deducts the first adjustment amount gained.
406, current value is adjusted to that present current value adds the second adjustment amount gained and value
407, current versus brightness correspondence table is generated.
Step 201 ~ 207 one_to_one corresponding in above step 401 ~ 407 and the second embodiment, repeats no more here.Following steps 408 ~ 410 substitute step 208 ~ 210 in the second embodiment, namely use static line approximation to substitute dynamic line approximation.
408, according to current versus brightness correspondence table acquisition one fixed slope value.
Wherein, fixed slope value continues to continue to use by adjustment afterwards.Fixed slope value can be the brightness value point (C of minimum current value and correspondence thereof
min, B
min), the slope of the straight line at the brightness value point place of lowest high-current value and correspondence thereof, concrete restriction is not done to the acquisition methods of fixing straight line here.
Referring to Fig. 5, is current versus brightness graph of relation, and wherein, current versus brightness relation curve is uncertain in fact, represented by dashed line in the drawings, when system initialization, and the brightness value point (C of minimum current value and correspondence thereof
min, B
min), the brightness value point (C of lowest high-current value and correspondence thereof
max, B
max), brightness value point (C, B) of present current value and correspondence thereof.Hypothetical target brightness value is B
t, the impact point on current versus brightness relation curve is (C
t, B
t).
According to current versus brightness correspondence table acquisition one fixed slope value, in the above example, namely obtain fixed slope value k.Such as, k=(B
max-B
min) ÷ (C
max-C
min).
409, target current value corresponding to target brightness value is calculated according to target current value calculating formula.
Wherein, target current value calculating formula is: target current value=(target brightness value-present intensity value+fixed slope value × present current value) ÷ fixed slope value.
Accept above-mentioned example, use differential thought, current value and brightness value is regarded as linear relationship in the relation among a small circle, by point (C, B) corresponding relation roughly and between fixed slope value k calculating current value and brightness value, 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 deviation.
410, current value is adjusted to target current value.
Accept above-mentioned example, C is adjusted to C '
t, the actual point obtained at current versus brightness relation curve for (C '
t, B '
t), i.e. B '
tfor the brightness value obtained after this adjustment.As can be known from Fig. 5, point (C '
t, B '
t) and point (C
t, B
t) still there is deviation.
When current value is adjusted to B '
tafter, re-execute step 401, namely rejudge B '
twith B
trelation.Until B and the absolute value of difference be less than first threshold 5.
After performing step 410, again trigger and perform step 401.Until the absolute value of present intensity value and target brightness value difference is less than first threshold.
Preferably, when present current value reaches lowest high-current value, this adjustment flow process also can terminate.
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 fixing, is namely static, and in static line approximation, the slope of consult straight line is change, is namely dynamic.
In the present embodiment, first the absolute value of present intensity value and target brightness value difference is calculated, by judging the magnitude relationship of this absolute value and first threshold, Second Threshold, and then select and progressively finely tune method or line approximation and adjust present current value, until present intensity value equals target brightness value or difference within acceptable scope.Technical solution of the present invention walks around the three-dimensional relationship between brightness value in projecting apparatus relevant parameter, current value, time three, and the present intensity being maintained projecting apparatus by the real-time adjustment of current value is in target brightness level.Improve the display quality of projecting apparatus.
Fourth embodiment of the invention will be described in detail to a kind of brightness regulating apparatus, comprise one or more unit for realizing one or more steps of preceding method in the brightness regulating apparatus described in the present embodiment.Therefore, corresponding unit in described brightness regulating apparatus is applicable to the description of step each in preceding method.The brightness regulating apparatus concrete structure of the present embodiment refers to Fig. 6, comprising:
Computing unit 601, first judging unit 602, second judging unit 603, first adjustment unit 604 and the second adjustment unit 605.
Wherein, computing unit 601, first judging unit 602 and the second judging unit 603 communicate to connect successively, and the first adjustment unit 604, second adjustment unit 605 communicates to connect with the second judging unit 603 respectively.
Computing unit 601, for calculating the absolute value of present intensity value and target brightness value difference.
Present intensity value can use the acquisitions such as luminance sensor, does not do concrete restriction here.Target brightness value can preset, and can also need to confirm according to user, not do concrete restriction here, only think that object brightness is a fixed value.In 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 present intensity value and target brightness value difference, and the order of magnitude of this difference can represent the deviation oscillation of present intensity value relative to target brightness value.Then, the first judging unit 602 compares the absolute value of this difference and the magnitude relationship of first threshold.If the absolute value of present intensity value and target brightness value difference is greater than first threshold, then triggers the second judging unit 603 executable operations, otherwise do not carry out any operation.
First judging unit 602, for the relation of the absolute value and first threshold that judge present intensity value and target brightness value difference, if judged result is the absolute value of present intensity value and target brightness value difference be greater than first threshold, then trigger the second judging unit 603 executable operations, otherwise, do not carry out any operation.
Second judging unit 603, judge the absolute value of present intensity value and target brightness value difference and the relation of Second Threshold, if judged result is the absolute value of present intensity value and target brightness value difference be less than Second Threshold, then trigger the first adjustment unit 604 executable operations, if judged result is the absolute value of present intensity value and target brightness value difference be greater than Second Threshold, then trigger the second adjustment unit 605 executable operations.
Wherein, first threshold is the maximum that brightness value allows to depart from target brightness value, when Second Threshold is for needing to adjust when present intensity, takes the boundary brightness of adjustable strategies not of the same race.
Adjustable strategies in the present embodiment comprises progressively finely tunes method and line approximation.Method of progressively finely tuning is used for fine setting, and line approximation is used for coarse adjustment.
First adjustment unit 604, adjusts present current value for adopting method of progressively finely tuning.
Wherein, method of progressively finely tuning refers to the relevant record in preceding embodiment, repeats no more here.
Second adjustment unit 605, adjusts present current value for adopting line approximation.
Wherein, line approximation refers to the relevant record in preceding embodiment, repeats no more here.
Preferably, the first judging unit 602, also for reaching lowest high-current value when present current value, terminates adjustment flow process.
In the present embodiment, first computing unit 601 calculates the absolute value of present intensity value and target brightness value difference, the magnitude relationship of this absolute value and first threshold, Second Threshold is judged by the first judging unit 602, second judging unit 603, and then by the first adjustment unit 604 or the second adjustment unit 605 with progressively finely tuning method or line approximation adjusts present current value, until present intensity value equals target brightness value or difference within acceptable scope.Technical solution of the present invention walks around the three-dimensional relationship between brightness value in projecting apparatus relevant parameter, current value, time three, and the present intensity being maintained projecting apparatus by the real-time adjustment of current value is in target brightness level.Improve the display quality of projecting apparatus.
Fifth embodiment of the invention remarks additionally to the brightness regulating apparatus described in the 4th embodiment, comprises one or more unit for realizing one or more steps of preceding method in the brightness regulating apparatus described in the present embodiment.Therefore, corresponding unit in described brightness regulating apparatus is applicable to the description of step each in preceding method.Brightness regulating apparatus concrete structure described in the present embodiment refers to Fig. 7, comprising:
Implement described identical computing unit 701, first judging unit 702, second judging unit 703, first adjustment unit 704 and the second adjustment unit 705 with the 4th, the brightness regulating apparatus of the present embodiment comprises further: generation unit 706.
Wherein, computing unit 701, first judging unit 702 and the second judging unit 703 communicate to connect successively, and the first adjustment unit 704, second adjustment unit 705 and generation unit 706 communicate to connect with the second judging unit 703 respectively.
Generation unit 706, for generating current versus brightness correspondence table, current versus brightness correspondence table is for recording known current value and corresponding brightness value thereof, and current versus brightness correspondence table at least comprises the brightness value of the brightness value of minimum current value and correspondence thereof, lowest high-current value and correspondence thereof.Computing unit 701, first judging unit 702, second judging unit 703, first adjustment unit 704 and the second adjustment unit 705 refer to the associated description of an embodiment, repeat no more here.
First adjustment unit 704 comprises further:
First judgment sub-unit 7041, for judging the magnitude relationship of present intensity value and target brightness value, if judged result is present intensity value be greater than target brightness value, then trigger the first fine setting subelement 7042 executable operations, if judged result is present intensity value be less than target brightness value, then trigger the second fine setting subelement 7043 executable operations.
First fine setting subelement 7042, deducts the difference of the first adjustment amount gained for current value being adjusted to present current value.
Second fine setting subelement 7043, for being adjusted to that present current value adds the second adjustment amount gained and value by current value.
Second adjustment unit 705 comprises further:
Dynamic conditioning subelement 7051, adjusts present current value for adopting dynamic line approximation.
Static adjust subelement 7052, adjusts present current value for adopting static line approximation.
Dynamic conditioning subelement 7051 and static adjust subelement 7052 are selecting a use with once adjusting in flow process.
Dynamic conditioning subelement 7051 comprises further:
First obtains submodule 70511, for obtaining with the immediate brightness value of present intensity value and corresponding current value thereof as reference brightness value and reference current value from current versus brightness correspondence table.
First calculating sub module 70512, 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) ÷ (present intensity value-reference brightness value) × (present current value-reference current value).
First adjustment submodule 70513, for being adjusted to this target current value by current value.
Static adjust subelement 7052 comprises further:
Second obtains submodule 70521, for showing acquisition one fixed slope value according to current versus brightness correspondence.
Second calculating sub module 70522, 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-present intensity value+fixed slope value × present current value) ÷ fixed slope value.
Second adjustment submodule 70523, for being adjusted to this target current value by current value.
About the dynamic line approximation involved by dynamic conditioning subelement 7051 and static adjust subelement 7052 and static line approximation, refer to the relevant record of preceding embodiment, repeat no more here.
One of ordinary skill in the art will appreciate that all or part of step realized in above-described embodiment method is that the hardware that can carry out instruction relevant by program completes, described program can be stored in a kind of computer-readable recording medium, the above-mentioned storage medium mentioned can be read-only memory, disk or CD etc.
Above a kind of projector brightness control method provided by the present invention and device are described in detail, for one of ordinary skill in the art, according to the thought of the embodiment of the present invention, all will change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention.
Claims (8)
1. a projector brightness control method, is characterized in that, comprising:
Calculate the absolute value of present intensity value and target brightness value difference;
If the absolute value of described present intensity value and target brightness value difference is greater than first threshold, then judge whether the absolute value of described present intensity value and target brightness value difference is less than Second Threshold;
If so, then adopt method of progressively finely tuning to adjust present current value, if not, then adopt line approximation to adjust present current value;
Described employing line approximation comprises taking a step forward of adjusting of present current value:
Generate current versus brightness correspondence table, described current versus brightness correspondence table is for recording known current value and corresponding brightness value thereof, and described current versus brightness correspondence table at least comprises the brightness value of the brightness value of minimum current value and correspondence thereof, lowest high-current value and correspondence thereof;
Described employing line approximation is carried out adjustment to present current value and is comprised:
Dynamic line approximation is adopted to adjust described present current value;
Or,
Static line approximation is adopted to adjust described present current value.
2. method according to claim 1, is characterized in that, described employing method of progressively finely tuning is carried out adjustment to present current value and comprised:
Judge the magnitude relationship of described present intensity value and described target brightness value;
If described present intensity value is greater than described target brightness value, then current value is adjusted to the difference that described present current value deducts the first adjustment amount gained, until the absolute value of described present intensity value and described target brightness value difference is less than first threshold;
If described present intensity value is less than described target brightness value, then current value is adjusted to that described present current value adds the second adjustment amount gained and value, until the absolute value of described present intensity value and described target brightness value difference is less than first threshold.
3. method according to claim 1, is characterized in that, the dynamic line approximation of described employing is carried out adjustment to described present current value and comprised:
Obtain from described current versus brightness correspondence table with the immediate brightness value of described present intensity 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) ÷ (present intensity value-reference brightness value) × (present current value-reference current value);
Current value is adjusted to described target current value.
4. method according to claim 1, is characterized in that, the static line approximation of described employing is carried out adjustment to described present current value and comprised:
According to described current versus brightness correspondence table acquisition one fixed slope 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-present intensity value+fixed slope value × present current value) ÷ fixed slope value;
Current value is adjusted to described target current value.
5. a brightness regulating apparatus, is characterized in that, comprising:
Computing unit, for calculating the absolute value of present intensity value and target brightness value difference;
First judging unit, for judging described present intensity value and the absolute value of target brightness value difference and the relation of first threshold, if judged result is the absolute value of described present intensity value and target brightness value difference be greater than described first threshold, then trigger the second judging unit executable operations;
Second judging unit, judge described present intensity value and the absolute value of target brightness value difference and the relation of Second Threshold, if judged result is the absolute value of described present intensity value and target brightness value difference be less than described Second Threshold, then trigger the first adjustment unit executable operations, if judged result is the absolute value of described present intensity value and target brightness value difference be greater than described Second Threshold, then trigger the second adjustment unit executable operations;
First adjustment unit, adjusts present current value for adopting method of progressively finely tuning;
Second adjustment unit, adjusts present current value for adopting line approximation;
Described brightness regulating apparatus comprises further:
Generation unit, for generating current versus brightness correspondence table, described current versus brightness correspondence table is for recording known current value and corresponding brightness value thereof, and described current versus brightness correspondence table at least comprises the brightness value of the brightness value of minimum current value and correspondence thereof, lowest high-current value and correspondence thereof;
Described second adjustment unit comprises further:
Dynamic conditioning subelement, adjusts described present current value for adopting dynamic line approximation;
Static adjust subelement, adjusts described present current value for adopting static line approximation.
6. brightness regulating apparatus according to claim 5, is characterized in that, described first adjustment unit comprises further:
First judgment sub-unit, for judging the magnitude relationship of described present intensity value and described target brightness value, if judged result is described present intensity value be greater than described target brightness value, then trigger the first fine setting subelement executable operations, if judged result is described present intensity value be less than described target brightness value, then trigger the second fine setting subelement executable operations;
First fine setting subelement, deducts the difference of the first adjustment amount gained, until the absolute value of described present intensity value and described target brightness value difference is less than first threshold for current value being adjusted to described present current value;
Second fine setting subelement, for current value being adjusted to that described present current value adds the second adjustment amount gained and value, until the absolute value of described present intensity value and described target brightness value difference is less than first threshold.
7. brightness regulating apparatus according to claim 5, is characterized in that, described dynamic conditioning subelement comprises further:
First obtains submodule, for obtaining from described current versus brightness correspondence table with the immediate brightness value of described present intensity value and corresponding current value thereof as reference brightness value and reference current value;
First calculating sub module, 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) ÷ (present intensity value-reference brightness value) × (present current value-reference current value);
First adjustment submodule, for being adjusted to described target current value by current value.
8. brightness regulating apparatus according to claim 5, is characterized in that, described static adjust subelement comprises further:
Second obtains submodule, for showing acquisition one fixed slope value according to described current versus brightness correspondence;
Second calculating sub module, 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-present intensity value+fixed slope value × present current value) ÷ fixed slope value;
Second adjustment submodule, for being adjusted to described target current value by current value.
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| CN113376942B (en) * | 2020-03-09 | 2022-08-19 | 青岛海信激光显示股份有限公司 | Laser projection equipment |
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