CN101193488A - Brightness adjusting method and device - Google Patents
Brightness adjusting method and device Download PDFInfo
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- CN101193488A CN101193488A CNA2006101403024A CN200610140302A CN101193488A CN 101193488 A CN101193488 A CN 101193488A CN A2006101403024 A CNA2006101403024 A CN A2006101403024A CN 200610140302 A CN200610140302 A CN 200610140302A CN 101193488 A CN101193488 A CN 101193488A
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Abstract
The invention relates to a method for adjusting brightness. The invention can adjust the brightness of at least one fluorescent lamp. The method for adjusting the brightness includes the following steps: a current value and a voltage value of the fluorescent lamp are sensed, and a brightness value is obtained according to the current value and voltage value; the brightness value and a target brightness value are compared and a result of comparison is obtained, and the current value or voltage value is adjusted according to the result of comparison. The invention also discloses a device for adjusting the brightness. By adopting the invention, the material cost of temperature sensing elements is saved.
Description
Technical field
The present invention relates to a kind of luminance regulating method and device, particularly relate to a kind of luminance regulating method and device.
Background technology
Along with the progress of electronics technology, the accompanied electronic product is in vogue especially in daily life, is to increase day by day for the demand of the display frivolous, that power consumption is low.Wherein, LCD (Liquidcrystal Display, LCD) low with its power consumption, caloric value is few, in light weight and non-radiation type or the like advantage, be used in already in the electronic product miscellaneous, and little by little replace traditional cathode-ray tube display (Cold Cathode Tube Display, CRT Display).
Generally speaking, LCD is mainly to comprise a liquid crystal panel and a module backlight.Wherein, liquid crystal panel is to have two substrates and to be located in liquid crystal layer between two substrates; And module backlight is the surface that the light from a light source can be evenly distributed in liquid crystal panel.
Mainly be to make the light source in the module backlight traditionally with fluorescent lamp (Fluorescent Lamp).Wherein, fluorescent lamp can be divided into again cold cathode fluorescent lamp (Cold Cathode Fluorescent Lamp, CCFL) and hot cathode fluorescent lamp (Hot Cathode Fluorescent Lamp).Cold cathode fluorescent lamp be with cold cathode electrode replace can the heating thermic cathode electrode (for example: tungsten filament), but because cold cathode fluorescent lamp cold-starting, add efficient and long-lived characteristics, so make cold cathode fluorescent lamp become backlight main in the LCD.
See also Fig. 1, the cold cathode fluorescent lamp 10 of existing known techniques is to comprise a glass tube 11, and the inwall that two ends in the glass tube 11 respectively are provided with an electrode 12, glass tube 11 then evenly is being coated with fluorescent layer (phosphor layer) 13.In the glass tube 11 be filled with mercury vapor and mix blunt gas (for example: the mist of xenon, argon), as discharge medium (Discharge Medium).
During energising, electrode 12 connects external power source and disengages electronics, and electronics quickens to collide the discharge medium of glass tube 11 inside through electric field, makes discharge medium be in excite state, disengages ultraviolet light then to get back to ground state.Wherein, the ultraviolet light that discharge medium discharged then can be absorbed by the fluorescent layer 13 of glass tube inside, and sends visible light.
Yet the brightness of cold cathode fluorescent lamp 10 is quite responsive to temperature, when cold start-up (cold start), the brightness meeting of cold cathode fluorescent lamp 10 is quite faint at the beginning, along with lamp hole temperature raises, brightness just strengthens gradually, just can demonstrate stable brightness after a period of time then.With 32 cun modules backlight with 16 cold cathode fluorescent lamps is example, needs 60 minutes warm-up period approximately, and cold cathode fluorescent lamp 10 just can send stable brightness.If see that with the user serial that 60 minutes is an example, when the brightness of display frame is not enough when the user feels just to start, may be with the brightness increasing (operating current of fluorescent tube increased) of manual mode with fluorescent tube, but along with the temperature of cathodouminescence lamp 10 rises gradually, brightness also increases gradually, after a period of time, the user can think that on the contrary display frame is too bright, needs brightness to be reduced again.In order to obtain suitable picture brightness, the user must adjust the brightness of picture back and forth, brings inconvenience really.
From the above, how providing a kind of luminance regulating method and the device that can adjust lighting tube brightness automatically, to solve the problem that the user manually adjusts, is a big problem in fact!
This shows that the device of above-mentioned existing adjustment lighting tube brightness obviously still has inconvenience and defective, and demands urgently further being improved in method of adjustment, product structure and use.In order to solve the problem of above-mentioned existence, relevant manufacturer there's no one who doesn't or isn't seeks solution painstakingly, but do not see always that for a long time suitable design finished by development, and general method of adjustment and product do not have appropriate method and structure to address the above problem, and this obviously is the problem that the anxious desire of relevant dealer solves.Therefore how to found a kind of luminance regulating method and device of automatic adjustment lighting tube brightness newly, real one of the current important research and development problem that belongs to, also becoming the current industry utmost point needs improved target.
Because the defective that the luminance regulating method of above-mentioned existing adjustment lighting tube brightness and device exist, the inventor is based on being engaged in this type of product design manufacturing abundant for many years practical experience and professional knowledge, and the utilization of cooperation scientific principle, actively studied innovation, in the hope of founding a kind of luminance regulating method and device of automatic adjustment lighting tube brightness newly, can improve the luminance regulating method and the device of general existing adjustment lighting tube brightness, make it have more practicality.Through constantly research, design, and after studying repeatedly and improving, create the present invention who has practical value finally.
Summary of the invention
Main purpose of the present invention is, overcome the luminance regulating method of existing adjustment lighting tube brightness and the defective that device exists, and a kind of new luminance regulating method and the device that can adjust lighting tube brightness automatically be provided, technical problem to be solved is to make it solve the problem that the user manually adjusts, thereby is suitable for practicality more.
The object of the invention to solve the technical problems realizes by the following technical solutions.According to a kind of luminance regulating method that the present invention proposes, be the brightness of adjusting at least one fluorescent lamp, it is characterized in that it may further comprise the steps: a current value of this fluorescent lamp of sensing and a magnitude of voltage; Obtain a brightness value according to this current value and this magnitude of voltage; Relatively this brightness value and a target brightness value and obtain a comparison result; And adjust this current value or this magnitude of voltage according to this comparison result.
The object of the invention to solve the technical problems also can be applied to the following technical measures to achieve further.
Aforesaid luminance regulating method wherein saidly obtains in this brightness value step according to this current value and this magnitude of voltage, is to seek and this current value and corresponding this brightness value of this magnitude of voltage in a memory table.
Aforesaid luminance regulating method, wherein said memory table are the corresponding plural number experiment of plural number experiment current value and the plural experimental voltage value institute brightness values of this fluorescent lamp of record.
Aforesaid luminance regulating method wherein saidly obtains in this brightness value step according to this current value and this magnitude of voltage, is to calculate corresponding this brightness value by this current value and this magnitude of voltage.
The object of the invention to solve the technical problems also realizes by the following technical solutions.According to a kind of brightness adjusting device that the present invention proposes, be the brightness of adjusting at least one fluorescent lamp, this brightness adjusting device comprises: a driver element is to produce a power signal to drive this fluorescent lamp; An and control unit, be a current value and a magnitude of voltage of this fluorescent lamp of sensing, and obtain a brightness value according to this current value and this magnitude of voltage, relatively this brightness value and a target brightness value, this control unit is to send a controlling signal to this driver element, and this driver element is this current value or this magnitude of voltage of adjusting this fluorescent lamp.
The object of the invention to solve the technical problems also can be applied to the following technical measures to achieve further.
Aforesaid brightness adjusting device, wherein said driver element is to comprise all to gain the loop of boosting, road and, this switching circuit is to be electrically connected with this control unit, and carry out open and close according to this controlling signal that this control unit is exported, this loop of boosting is to be electrically connected and to produce by the open and close of this switching circuit this power signal with this switching circuit.
Aforesaid brightness adjusting device, wherein said control unit are to seek and this current value and corresponding this brightness value of this magnitude of voltage in a memory table.
Aforesaid brightness adjusting device, wherein said memory table are that the corresponding jointly plural number of plural number experiment current value and plural experimental voltage value and institute thereof of this fluorescent lamp of record is tested brightness value.
Aforesaid brightness adjusting device, wherein said memory table are that burning is in this control unit.
Aforesaid brightness adjusting device, wherein said control unit are to be a numerical digit controller.
Aforesaid brightness adjusting device, wherein said control unit are to comprise a numerical digit controller, and this memory table is that burning is in this numerical digit controller.
Aforesaid brightness adjusting device, wherein said control unit comprises a memory body, and this memory table is to be recorded in this memory body.
Aforesaid brightness adjusting device, wherein said control unit comprises a sensing loop, and this sensing loop is this current value and this magnitude of voltage of this fluorescent lamp of sensing.
Aforesaid brightness adjusting device, wherein said sensing loop are to comprise a voltage sensing loop and a current sensing loop.The present invention compared with prior art has tangible advantage and beneficial effect.By above technical scheme as can be known, major technique of the present invention thes contents are as follows: for reaching above-mentioned purpose, the present invention provides a kind of luminance regulating method, be the brightness of adjusting at least one fluorescent lamp, luminance regulating method comprises a current value and a magnitude of voltage of sensing fluorescent lamp, obtain a brightness value according to current value and magnitude of voltage, a comparison brightness value and a target brightness value also obtain a comparison result, adjust current value or magnitude of voltage according to comparison result.
In order to achieve the above object, the present invention also provides a kind of brightness adjusting device, is the brightness of adjusting at least one fluorescent lamp, and brightness adjusting device comprises a driver element and a control unit.Driver element is to produce a power signal to drive fluorescent lamp, control unit is a current value and a magnitude of voltage of sensing fluorescent lamp, and obtain a brightness value according to current value and magnitude of voltage, a comparison brightness value and a target brightness value, control unit is to send a controlling signal to driver element, and driver element is current value or a magnitude of voltage of adjusting fluorescent lamp.
By technique scheme, luminance regulating method of the present invention and device have following advantage at least: from the above, luminance regulating method of the present invention and adjusting device are the current value and the magnitude of voltage of sensing fluorescent lamp, to calculate the present brightness value of fluorescent lamp, carry out the adjustment of lighting tube brightness.Compare with existing known techniques, luminance regulating method of the present invention and adjusting device do not need temperature sensor to come the temperature of sensing fluorescent lamp, and carry out the adjustment of lighting tube brightness.Luminance regulating method of the present invention and adjusting device are the current value and the magnitudes of voltage of sensing fluorescent lamp, calculate or search through control unit and can obtain a present lighting tube brightness value at the memory table, again can be after comparison by current value and the magnitude of voltage of adjusting fluorescent lamp, so that the brightness of fluorescent lamp is adjusted to target fluorescent tube brightness value.In the present embodiment, luminance regulating method and adjusting device can carry out the sensing of fluorescent lamp current value and magnitude of voltage at any time, immediately to adjust the brightness value of fluorescent lamp.Thus, can save the material cost of temperature sensor.
In sum, the invention relates to a kind of luminance regulating method, be the brightness of adjusting at least one fluorescent lamp, luminance regulating method comprises a current value and a magnitude of voltage of sensing fluorescent lamp, obtain a brightness value according to current value and magnitude of voltage, a comparison brightness value and a target brightness value also obtain a comparison result, adjust current value or magnitude of voltage according to comparison result.The present invention also discloses a kind of brightness adjusting device.Can save the material cost of temperature sensor.The present invention has above-mentioned plurality of advantages and practical value, no matter it all has bigger improvement on method of adjustment, product structure or function, obvious improvement is arranged technically, and produced handy and practical effect, and more existing luminance regulating method and device have the outstanding effect of enhancement, thereby being suitable for practicality more, and having the extensive value of industry, really is a new and innovative, progressive, practical new design.
Above-mentioned explanation only is the general introduction of technical solution of the present invention, for can clearer understanding technological means of the present invention, and can be implemented according to the content of specification, and for above-mentioned and other purposes, feature and advantage of the present invention can be become apparent, below especially exemplified by preferred embodiment, and conjunction with figs., be described in detail as follows.
Description of drawings
Fig. 1 is the schematic diagram for existing known cold cathode fluorescent lamp;
Fig. 2 is the schematic diagram for the brightness adjusting device of preferred embodiment of the present invention;
Fig. 3 is in the brightness adjusting device for preferred embodiment of the present invention, a schematic diagram of driver element;
Fig. 4 is in the brightness adjusting device for preferred embodiment of the present invention, and one of driver element specifically constitutes schematic diagram;
Fig. 5 is in the brightness adjusting device for preferred embodiment of the present invention, and another of driver element be concrete to constitute schematic diagram;
Fig. 6 is in the brightness adjusting device for preferred embodiment of the present invention, a schematic diagram of memory table;
Fig. 7 is the lighting tube brightness distribution schematic diagram under different temperatures and the different current/voltage;
Fig. 8 is the lighting tube brightness distribution schematic diagram under different electric currents and the different voltage; And
Fig. 9 is the flow process schematic diagram for the luminance regulating method of preferred embodiment of the present invention.
10: cold cathode fluorescent lamp 11: glass tube
12: electrode 13: fluorescent layer
2: brightness adjusting device 21,21 ': driver element
211: switching circuit 212,212 ': the loop of boosting
22: control unit 221: sensing loop
222: memory table 223: controller
A-D, X: some B
i: experiment fluorescent tube brightness value
B
1, B
2, B
3, B
4, B
5, B
6, B
12, B
c: the lighting tube brightness value
B
t: target brightness value Ca: capacitor
I
c, I
1: current value I
i: the experiment current value
L: fluorescent lamp P
Ia, P
Ib: switch signal
S
c: controlling signal S10-S70: brightness set-up procedure
T
1, T
2, T
3, T
4, T
5: lamp hole temperature Ta, Ta ', Tb, Tb ': electric crystal
Tm, Tm ': transformer V
i: the experimental voltage value
V
c: V
2: magnitude of voltage
Embodiment
Reach technological means and the effect that predetermined goal of the invention is taked for further setting forth the present invention, below in conjunction with accompanying drawing and preferred embodiment, the luminance regulating method that foundation the present invention is proposed and install its embodiment, method, step, structure, feature and effect thereof, describe in detail as after.
Hereinafter with reference to correlative type, luminance regulating method and device according to preferred embodiment of the present invention are described.
At first, see also the brightness adjusting device of Fig. 2 to Fig. 7 with explanation preferred embodiment of the present invention.
As shown in Figure 2, brightness adjusting device 2 comprises a driver element 21 and a control unit 22.Wherein, brightness adjusting device 2 is the brightness (luminance) of adjusting at least one fluorescent lamp, and in the present embodiment, fluorescent lamp L is that (Cold Cathode Fluorescent Lamp CCFL) is example with a cold cathode fluorescent lamp.And the purposes of cold cathode fluorescent lamp is quite extensive, except the light source of the backlight that can be used as liquid crystal indicator and portions of electronics device (for example scanner), and can also be as the light source of daily life lighting device.At this, be to be example as a backlight of liquid crystal indicator with cold cathode fluorescent lamp, wherein the quantity of fluorescent lamp L does not limit, and in the present embodiment, is to be example with the brightness of adjusting a fluorescent lamp L.Among Fig. 2, control unit 22 can comprise a sensing loop 221, a memory table 222, and a controller 223, and the part of relevant controlling unit 22 then is described in further detail after a while again.
See also Fig. 3, driver element 21 is to produce a power signal (power signal) to drive fluorescent lamp L, and wherein driver element 21 can comprise all and gains the loop 212 of boosting, road 211 and.Switching circuit 211 is to be electrically connected with the loop 212 of boosting, and it is to produce power signal by the open and close of switching circuit 211.
As shown in Figure 4, it is specifically to constitute for one of driver element 21, the loop 212 of boosting of driver element 21 is to comprise a transformer Tm and a capacitor Ca, and switching circuit 211 is to comprise two electric crystals (Ta, Tb), electric crystal is an end that is electrically connected on capacitor Ca respectively, and (Ta is to carry out open and close according to switching signal (Pia, Pib) respectively Tb) to electric crystal.Switching circuit 211 is to be electrically connected with control unit 22, and carries out open and close according to one group of switching signal that control unit 22 is exported.In addition, as shown in Figure 5, driver element 21 ' also can be another formation, that is the loop 212 ' of boosting is to comprise a transformer Tm '; And switching circuit 211 ' is to comprise two electric crystals (Ta ', Tb '), and these electric crystals (Ta ', Tb ') be the primary winding side that is electrically connected on transformer Tm ' respectively, electric crystal (Ta ', Tb ') be to carry out open and close according to switching signal respectively.
See also Fig. 2 again, control unit 22 is to be electrically connected with driver element 21, and generally speaking, control unit 22 is to be electrically connected with driver element 21 by a connecting line (not being shown in figure).Control unit 22 is to produce one at least to switch signal, and driver element 21 is to produce power signal according to switching signal.In addition, in the present embodiment, the part control circuit of control unit 22 can be integrated into a numerical digit controller (Digital Controller IC), and makes control unit 22 comprise this numerical digit controller, or control unit 22 directly is integrated into a numerical digit controller.
In addition, the sensing loop 221 of control unit 22 is a current value I c and magnitude of voltage Vc of sensing fluorescent lamp L, and wherein current value I c representative is by the operating current intensity of fluorescent lamp L.In addition, because be to be a string ripple, so represent VRMS voltage root mean square (Root Mean Square Voltage) by fluorescent lamp L with magnitude of voltage Vc by the voltage strength of fluorescent lamp L.Wherein, sensing loop 221 can comprise a current sensing loop and a voltage sensing loop, and current sensing loop can have a sensing element, in order to the current value I c of senses flow through fluorescent lamp L; The magnitude of voltage that then can order via sensing X in the voltage sensing loop obtains the magnitude of voltage Vc of fluorescent lamp L.
As shown in Figure 6, it is to be a memory table (memory table) 222, is writing down the experiment fluorescent tube brightness value Bi of the common correspondence of plural number experiment current value I i and plural experimental voltage value Vi and institute thereof.Data in the memory table are that different current strength is passed through fluorescent lamp L respectively with different voltage strengths, to measure the brightness value that fluorescent lamp L is produced.For instance, when the current value by fluorescent lamp L is I1, and during the magnitude of voltage V2 by fluorescent lamp L, the fluorescent lamp brightness value that then measures is B12.After time experiment measures through plural number, can obtain the empirical value in the memory table 222, and the fluorescent tube of different size can have different memory tables 222.
See also Fig. 2, storing memory table 222 can have many forms, for example memory table 222 can be burned onto the controller 223 in the control unit 22, or have a memory body in the control unit 22, and memory table 222 is to be recorded in the memory body.In the present embodiment, be to be example with the burning of memory table 222 in a memory body, and the controllers 223 in the control unit 22 are to electrically connect with the memory body that records memory table 222, wherein, controller 223 is to be a numerical digit controller (Digital Controller).
When control unit 22 senses present current value and magnitude of voltage by fluorescent lamp L is Ic, and during Vc, control unit 22 can be sought and current value I c and the corresponding lighting tube brightness value Bc of magnitude of voltage Vc in memory table 222 via controller 223.Certainly,, obtain an immediate formula after as calculated, when representing the mutual corresponding relation of current value, magnitude of voltage and lighting tube brightness value with this formula again, the direct delivery controller 223 of this formula can be carried out calculating if will remember the interior experimental data of table 222.Current value I c and magnitude of voltage Vc substitution formula can be obtained a corresponding brightness value Bc to calculate behind control unit 22 sensings, thus, then can not need a memory body to write down the data of memory table 222.
After control unit 22 obtains a brightness value Bc, i.e. comparison brightness value Bc and a target brightness value Bt, wherein, target brightness value Bt can be fluorescent lamp L and starts the brightness of stabilized illumination afterwards.After comparison,, then can not carry out the brightness adjustment if brightness value Bc equals target brightness value Bt; If brightness value Bc is greater than or less than target brightness value Bt, then control unit 22 can send a controlling signal Sc to driver element 21, and driver element 21 is current value I c or the magnitude of voltage Vc that adjust fluorescent lamp L, so that the lighting tube brightness value is transferred to target brightness value Bt.
See also shown in Figure 7ly, it is to be the lighting tube brightness distribution schematic diagram under different temperatures and the different current/voltage, can utilize in the memory table 222 experimental data to draw and form, wherein, lamp hole temperature T5＞T4＞T3＞T2＞T1; Lighting tube brightness value B6＜B5＜B4＜B3＜B2＜B1, and the hypothesis fluorescent tube is for deciding electric current (Ic) driving and target lighting tube brightness at the B2 block.Shown in A point among the figure, in the existing known techniques, when fluorescent tube is cold start-up, because lamp hole temperature lower (T1), so fluorescent tube inner vapor pressure deficiency makes brightness also lower (B3).But along with the slow rising of lamp hole temperature, the brightness of fluorescent tube then can become brighter luminosity B point (lighting tube brightness B2) and C point (lighting tube brightness B1) by the A point along with slow change, just reaches stable D point (lighting tube brightness B2) at last.
In the present embodiment, take place for fear of the problems referred to above, and alleviate the inconvenience that the user adjusts lighting tube brightness voluntarily, then can utilize the brightness adjusting device 2 shown in Fig. 2, to change current strength and voltage strength by fluorescent lamp L, in order to do lighting tube brightness is maintained in target fluorescent tube brightness value Bt, to offer the stable and suitable lighting tube brightness of user.
As shown in Figure 8, suppose that fluorescent tube is B2 for deciding electric current (Ic) driving and target fluorescent tube brightness value, the light tube electric voltage value through measuring fluorescent lamp L is to be Vc.Then then can look into the memory table or utilize formula to calculate to obtain a lighting tube brightness value Bc of present fluorescent tube according to current value I c and magnitude of voltage Vc.Then, whether comparison brightness value Bc equates with target fluorescent tube brightness value Bt, if lighting tube brightness value Bc equals target fluorescent tube brightness value Bt and then do not need to adjust lighting tube brightness.If lighting tube brightness value Bc when being not equal to target fluorescent tube brightness value Bt, then can distinguish following two kinds of situations: lighting tube brightness value Bc greater than target fluorescent tube brightness value Bt or Bc less than target fluorescent tube brightness value Bt.Suppose fluorescent lamp L for decide current drives, so (for example the C brightness value of ordering is Bc as the lighting tube brightness value Bc of correspondence during greater than target fluorescent tube brightness value Bt; And the B2 block is the scope of target brightness value Bt, and promptly desire transfers to B point or D point from the C point), the voltage that then can increase by fluorescent tube is positioned at the B point of B2 block with arrival, also can be to reduce the D point that is positioned at the B2 block by the brightness of fluorescent tube with arrival.Wherein, control unit can select the less mode of variation in voltage to adjust.In addition, (for example the B brightness value of ordering is Bc as the lighting tube brightness value Bc of correspondence during less than target fluorescent tube brightness value Bt; And the B1 block is the scope of target brightness value Bt, and promptly desire moves to the C point from the B point), then can reduce the C point that is positioned at the B1 block by the voltage of fluorescent tube with arrival.
In addition, fluorescent tube also can be for deciding driven, and change lighting tube brightness by the size that changes electric current.Certainly, also can change simultaneously, to change corresponding lighting tube brightness value by lamp tube current and voltage swing.After the adjustment, magnitude of voltage and the current value of sensing by fluorescent tube repeatedly still is so that fluorescent lamp L remains on target fluorescent tube brightness value Bt at any time.
Then, see also Fig. 9, with the luminance regulating method of explanation preferred embodiment of the present invention.
In the present embodiment, luminance regulating method is the brightness of adjusting at least one fluorescent lamp, luminance regulating method is to comprise the following step: a current value of sensing fluorescent lamp and a magnitude of voltage (S10), obtain a brightness value (S30) according to current value and magnitude of voltage, a comparison brightness value and a target brightness value also obtain a comparison result (S50), and adjust current value or magnitude of voltage (S70) according to comparison result.
Wherein, explanation does not in the lump repeat them here in the above-mentioned luminance regulating method brightness adjusting device in the aforementioned embodiment.Palpus attention person, the luminance regulating method of present embodiment can be performed at any time and immediately, owing to the temperature of fluorescent tube can change along with environment or operating time etc., and lamp tube current value and magnitude of voltage characteristic can change according to lamp hole temperature, so can set the adjustment of after a set time, promptly carrying out lighting tube brightness for, so that the brightness of fluorescent lamp L maintains target brightness value Bt.
From the above, because of according to luminance regulating method of the present invention and adjusting device, be the current value and the magnitude of voltage of sensing fluorescent lamp, to calculate the present brightness value of fluorescent lamp, carry out the adjustment of lighting tube brightness.Compare with existing known techniques, luminance regulating method of the present invention and adjusting device do not need temperature sensor to come the temperature of sensing fluorescent lamp, and carry out the adjustment of lighting tube brightness.Luminance regulating method of the present invention and adjusting device are the current value and the magnitudes of voltage of sensing fluorescent lamp, calculate or search through control unit and can obtain a present lighting tube brightness value at the memory table, again can be after comparison by current value and the magnitude of voltage of adjusting fluorescent lamp, so that the brightness of fluorescent lamp is adjusted to target fluorescent tube brightness value.In the present embodiment, luminance regulating method and adjusting device can carry out the sensing of fluorescent lamp current value and magnitude of voltage at any time, immediately to adjust the brightness value of fluorescent lamp.Thus, can save the material cost of temperature sensor.
The above, it only is preferred embodiment of the present invention, be not that the present invention is done any pro forma restriction, though the present invention discloses as above with preferred embodiment, yet be not in order to limit the present invention, any those skilled in the art, in not breaking away from the technical solution of the present invention scope, when the technology contents that can utilize above-mentioned announcement is made a little change or is modified to the equivalent embodiment of equivalent variations, in every case be not break away from the technical solution of the present invention content, according to technical spirit of the present invention to any simple modification that above embodiment did, equivalent variations and modification all still belong in the scope of technical solution of the present invention.
Claims (14)
1. a luminance regulating method is the brightness of adjusting at least one fluorescent lamp, it is characterized in that it may further comprise the steps:
One current value of this fluorescent lamp of sensing and a magnitude of voltage;
Obtain a brightness value according to this current value and this magnitude of voltage;
Relatively this brightness value and a target brightness value and obtain a comparison result; And
Adjust this current value or this magnitude of voltage according to this comparison result.
2. luminance regulating method according to claim 1 is characterized in that wherein saidly obtaining in this brightness value step according to this current value and this magnitude of voltage, is to seek and this current value and corresponding this brightness value of this magnitude of voltage in a memory table.
3. luminance regulating method according to claim 2 is characterized in that wherein said memory table is the corresponding plural number experiment of plural number experiment current value and the plural experimental voltage value institute brightness value of this fluorescent lamp of record.
4. luminance regulating method according to claim 1 is characterized in that wherein saidly obtaining in this brightness value step according to this current value and this magnitude of voltage, is to calculate corresponding this brightness value by this current value and this magnitude of voltage.
5. a brightness adjusting device is the brightness of adjusting at least one fluorescent lamp, and this brightness adjusting device comprises:
One driver element is to produce a power signal to drive this fluorescent lamp; And
One control unit, be a current value and a magnitude of voltage of this fluorescent lamp of sensing, and obtain a brightness value according to this current value and this magnitude of voltage, relatively this brightness value and a target brightness value, this control unit is to send a controlling signal to this driver element, and this driver element is this current value or this magnitude of voltage of adjusting this fluorescent lamp.
6. brightness adjusting device according to claim 5, it is characterized in that wherein said driver element is to comprise all to gain the loop of boosting, road and, this switching circuit is to be electrically connected with this control unit, and carry out open and close according to this controlling signal that this control unit is exported, this loop of boosting is to be electrically connected and to produce by the open and close of this switching circuit this power signal with this switching circuit.
7. brightness adjusting device according to claim 5 is characterized in that wherein said control unit is to seek and this current value and corresponding this brightness value of this magnitude of voltage in a memory table.
8. brightness adjusting device according to claim 7 is characterized in that wherein said memory table is that the corresponding jointly plural number of plural number experiment current value and plural experimental voltage value and institute thereof of this fluorescent lamp of record is tested brightness value.
9. brightness adjusting device according to claim 7 is characterized in that wherein said memory table is that burning is in this control unit.
10. brightness adjusting device according to claim 5 is characterized in that wherein said control unit is to be a numerical digit controller.
11. brightness adjusting device according to claim 7 is characterized in that wherein said control unit is to comprise a numerical digit controller, this memory table is that burning is in this numerical digit controller.
12. brightness adjusting device according to claim 7 is characterized in that wherein said control unit comprises a memory body, this memory table is to be recorded in this memory body.
13. brightness adjusting device according to claim 5 is characterized in that wherein said control unit comprises a sensing loop, this sensing loop is this current value and this magnitude of voltage of this fluorescent lamp of sensing.
14. brightness adjusting device according to claim 13 is characterized in that wherein said sensing loop is to comprise a voltage sensing loop and a current sensing loop.
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| CNA2006101403024A CN101193488A (en) | 2006-11-20 | 2006-11-20 | Brightness adjusting method and device |
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| CNA2006101403024A CN101193488A (en) | 2006-11-20 | 2006-11-20 | Brightness adjusting method and device |
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| CN101562936B (en) * | 2009-05-07 | 2013-05-22 | 福州华映视讯有限公司 | Method for improving and driving reaction time of backlight lighting tube brightness |
| CN101621869B (en) * | 2008-06-30 | 2013-06-05 | 联咏科技股份有限公司 | Light source device and light source adjusting module |
| CN103500558A (en) * | 2013-10-21 | 2014-01-08 | 深圳市华星光电技术有限公司 | LED (Light-Emitting Diode) backlight driving circuit and method |
| CN103561241A (en) * | 2013-11-11 | 2014-02-05 | 山东神戎电子股份有限公司 | Power adjustment method of laser night-vision device |
| CN103680418A (en) * | 2012-09-24 | 2014-03-26 | 精工爱普生株式会社 | Display apparatus and method for controlling display apparatus |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101621869B (en) * | 2008-06-30 | 2013-06-05 | 联咏科技股份有限公司 | Light source device and light source adjusting module |
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