CN100341046C - Automatic brigtness control method for display - Google Patents
Automatic brigtness control method for display Download PDFInfo
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- CN100341046C CN100341046C CNB2003101165234A CN200310116523A CN100341046C CN 100341046 C CN100341046 C CN 100341046C CN B2003101165234 A CNB2003101165234 A CN B2003101165234A CN 200310116523 A CN200310116523 A CN 200310116523A CN 100341046 C CN100341046 C CN 100341046C
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Abstract
The present invention relates to a method for automatically controlling the brightness of a display. The present invention is applied to a display for automatically adjusting the display brightness of the display according to the change of an environment luminance. The method comprises the following procedures: (a) obtaining a first signal value which represents the environment illuminance of the display; (b) obtaining a second signal value which represents the brightness of the display; (c) converting the first signal value to a third signal value which represents a set value of brightness needed by the display; (d) judging whether the third signal value and the second signal value are identical or not; (e) maintaining the second signal value when the third signal value and the second signal value are identical so as to maintain the current brightness of the display, adjusting the second signal value so that the second signal value and the third signal value are identical when the third signal value and the second signal value are different, which lasts for a period of first special time, and automatically adjusting the brightness of the display to needed brightness according to the change of the environment luminance.
Description
Technical field
The present invention relates to a kind of display brightness control method, particularly relate to a kind of display brightness control method that can change automatic adjustment display brightness according to ambient light illumination.
Background technology
In family, office or various public place, display has become the best interface of people and the communication of various machine or has captured the best end device of various information.At present at display miscellaneous on the market, cathode-ray tube display (cathode ray tube display) for example, LCD (liquidcrystal display), plasma scope (plasma display), electro-exciting light-emitting display (electro-luminescent display) and Field Emission Display (field emission display) etc. have been widely used in the various electric or information products, desktop PC for example, mobile computer, video and audio product, communication apparatus and personal digital assistant etc., and become gradually in the life and can not obtain a scarce part.
In recent years, along with the breakthrough and the development of LCD processing procedure, LCD has become one of at present the most popular on the market product.Especially information products such as mobile computer, requirements such as light for meeting, thin and power saving, LCD has become the basic outfit of mobile computer.See also Fig. 1, it has shown two kinds of main light sources that eyes can be seen when using LCD.As shown in Figure 1, these two kinds of light sources comprise: one for external environment is radiated at environment light source (the background light source) A that panel of LCD 12 reflexes to eyes, and another then exposes to backlight (the back light source) B of eyes imaging for penetrating LCD device panel 12.Usually, these two kinds of light source A, the luminance difference between B can make visual experience produce very big difference.For example, when and backlight B panel of LCD 12 brighter as environment light source A was dark, the user can feel more smudgy (fuzzy); And the backlight B of or panel of LCD 12 comparatively dim as environment light source A is when brighter, and the user then can feel more clear (clear).Yet; the ambient light illumination that environment light source A exposes to panel of LCD 12 changes because of various external environment conditioned disjunction factors through regular meeting; therefore how to make panel of LCD 12 moderately adjust its display brightness, and reach comfortable and become one of at present the most popular research and development problem with visual experience clearly in response to ambient light illumination changes.
At present existing many technology disclose the brightness adjusting method and the device of displays, its respectively letter be described below:
(1) for prolonging the battery service time of portable computer, people such as Saito invented on June 24th, 1991, and the United States Patent (USP) the 5th that on May 24th, 1994 was announced, 315, No. 695, disclosed a kind of Keyboard Control and portable computer and its control method of adjusting display brightness utilized in the title " PERSONALCOMPUTER CAPABLE OF ALTERING DISPLAY LUMINANCE THROUGH KEY OPERATION ".Its cardinal principle is to import brightness adjustment instruction by keyboard for the user, then by the intednsity circuit in the personal computer this is instructed pairing display brightness setting value be shown in display, so just can adjust the brightness of display to desirable value.
(2) people such as Shimomura invented on January 18th, 1994, and in the United States Patent (USP) the 5th, 406 of bulletin on April 11 nineteen ninety-five, No. 305, disclosed a kind of display device in the title " DISPLAY DEVICE ", it comprises: an ambient light sensor, the contiguous indicator screen that is arranged at; And a brightness settings unit, in order to import required brightness value.The output valve of ambient light sensor transfers to the screen intensity computing unit to calculate the adjustable scope of screen intensity.The signal that signal that brightness decision unit is then exported according to the screen intensity computing unit and brightness settings unit are exported determines a suitable display brightness value.The screen intensity control module then is adjusted to appropriate value according to the output signal of brightness decision unit with the brightness of screen.
(3) people such as Thayer invented May 15 nineteen ninety-five, and United States Patent (USP) the 5th in bulletin on September 10th, 1996,554, No. 912, disclosed a kind of instrument display brightness control system in the title " ADAPTIVE INSTRUMENT DISPLAYBRIGHTNESS CONTROL SYSTEM ", it can be automatically controls the instrument display brightness of vehicles according to the instruction of vehicle operator and special ambient light illumination.Its framework mainly is to export an ambient light signal to microprocessor by an ambient light sensor, and this microprocessor is looked from a brightness according to this ambient light signal and shown to select a brightness apparent value to make instrument display show this brightness then.If the operator of the vehicles adjusts the instrument display brightness, and the change of brightness is in the study scope of this system, and microprocessor will be set a suitable timer makes this changes effectively.After appointed date, this microprocessor will be adjusted the estimated rate of brightness apparent value to difference between original brightness apparent value and new brightness apparent value at this timer.
(4) people such as Beard invented May 22 nineteen ninety-five, and United States Patent (USP) the 5th in bulletin on May 5th, 1998,747, No. 938, disclosed a kind of electroluminescence backlight panel of image display system in the title " AUTOMATIC CONTROL ELECTROLUMINESCENTBACKLIGHT PANEL ", it is automatically controlled by the variation of ambient light illumination.Its cardinal principle is to receive an ambient light illumination value and export electric signal to a microcontroller of a correspondence by an optical sensor.This microcontroller changes the control electricity according to ambient light illumination and swashs the driving of backlight electric power supply up to reaching the suitableeest display brightness.Automatically the sharp backlight control system of electricity combines with a power-supply unit, with the loss of the further reduction energy content of battery.
(5) people such as Helms invented July 17 nineteen ninety-five, and United States Patent (USP) the 5th in bulletin on June 2nd, 1998,760, No. 760, a kind of apparatus and method of adjusting LCD brightness according to the ambient light illumination condition have automatically been disclosed in the title " INTELLIGENT LCD BRIGHTNESS CONTROLSYSTEM ".Its cardinal principle is to produce the intednsity circuit signal of representing ambient light illumination by an optical sensor.These signals are relevant with the auto brightness controlling value of being scheduled to, and are used for controlling automatically the brightness of LCD.Once the ambient light illumination signal automatically is used to set the brightness of LCD, the different brightness value setting values that the user selects no matter be high or low, will replace auto brightness control and set.
(6) people such as Suzuki invented on February 13rd, 1998, and United States Patent (USP) the 6th in bulletin on June 20th, 2000,078, No. 302, disclosed a kind of liquid crystal display equipment screen light panel in the title " SCREEN BRIGHTNESS CONTROL ", it can be adjusted to a suitableeest brightness value with it according to ambient light illumination immediately in preset time interval.When the screen intensity panel does not have when being adjusted, this screen intensity panel is actuated to keep the suitableeest brightness.After receiving trigger signals, a timer is used to detect a time interval to produce a timing signal.When the timing signal was received, power-supply controller of electric supply electric power was with adjustment brightness, and when the screen intensity panel had been adjusted, the output trigger signals was to timer.
(7) people such as Weindorf invented on September 8th, 2000, and United States Patent (USP) the 6th in bulletin on November 19th, 2002,483, No. 245, the apparatus and method of a kind of controlling filed emission display brightness have been disclosed in the title " AUTOMATIC BRIGHTNESS CONTROL USINGA VARIABLE TIME CONSTANT FILTER ".Especially when ambient light illumination brightened or be dark, display brightness also increased or reduces.One timing feature also is implemented with sensitivity of control system.Particularly, the time between LCD brightness is adjusted is partly relevant with the difference between required brightness and true brightness.
Yet the ambient light illumination that exposes to display pannel often has the situation generation of instability or change suddenly.For example, indoor fluorescent tube regular meeting glimmers because of power supply is unstable, also or when using mobile computer has the people to walk about near display pannel suddenly.These situations can cause the ambient light illumination that exposes to display pannel suddenly to change usually and return to former ambient light illumination again after a bit of time.For these situations, conventional art also can't be judged the unexpected or unsettled ambient light illumination change of this kind and can constantly change screen intensity, so certainly will cause the instability of visual discomfort and display.In addition, traditional display brightness has significantly when regulating beats, and can't adjust brightness in progressive mode, and the therefore clearly variation of brightness as can be seen when luminance fluctuation causes visual perception's discomfort.
Therefore, how overcoming the defective of above-mentioned technology, and a kind of display brightness control method that can regulate the display display brightness in response to the ambient light illumination vary stable is provided, is the problem that presses for solution at present.
Summary of the invention
Fundamental purpose of the present invention is to provide a kind of display brightness control method, to solve the problem that the traditional monitor brilliance control can't be adjusted display brightness automatically according to the ambient light illumination variation, and display brightness control system can not adjusted the display brightness of display immediately because of temporary transient variation of ambient light illumination, but carry out in the mode that progressively increases or reduce, make the display brightness of this display not have immediately acute variation.
For achieving the above object, the invention provides a kind of control method of display brightness, be used for a display to change the display brightness of adjusting this display automatically according to ambient light illumination.Method of the present invention comprises step: (a) obtain one first signal value, this first signal value is represented the ambient light illumination of display; (b) obtain one second signal value, this second signal value is represented the brightness of display; (c) the first signal value is converted to one the 3rd signal value, wherein the 3rd signal value is represented the brightness settings of display when this ambient light illumination; (d) judge whether the 3rd signal value is identical with the second signal value; And (e) when the 3rd signal value is identical with the second signal value, keep the second signal value, use and keep the present brightness of display, and when the 3rd signal value and the second signal value during different and lasting one first special time, adjust the second signal value and make it identical, change according to ambient light illumination and adjust display brightness automatically to required brightness with the 3rd signal value.
For achieving the above object, the present invention also provides a kind of control method of display brightness, is used for a display to change the display brightness of adjusting this display automatically according to ambient light illumination.Method of the present invention comprises step: (a) the ambient light illumination scope with this display is set at a plurality of intervals, and wherein each ambient light illumination interval is corresponding to a display brightness setting value; (b) obtain one first signal value, this first signal value is represented the ambient light illumination of this display; (c) obtain one second signal value, this second signal value is represented the brightness of this display; (d) judge what ambient light illumination interval this first signal value and this second signal value are positioned at, and this first signal value is converted to one the 3rd signal value, wherein the 3rd signal value represents this first signal value in the interval pairing display brightness setting value of this ambient light illumination; (e) judge whether the ambient light illumination interval of this first signal value is identical with the ambient light illumination interval of this second signal value; When (f) interval ambient light illumination interval with this second signal value when the ambient light illumination of this first signal value is identical, keep this second signal value, use and keep the present brightness of this display, and interval ambient light illumination with this second signal value when the ambient light illumination of this first signal value is interval when different, judges whether the ambient light illumination interval of this first signal value is higher than the pairing ambient light illumination of this second signal value interval; (g) when the ambient light illumination interval of this first signal value is higher than the pairing ambient light illumination of this second signal value interval, judge whether the 3rd signal value equates with this second signal value; And (h) when the 3rd signal value is identical with this second signal value, keep this second signal value, use and keep the present brightness of this display, and when the 3rd signal value and this second signal value during different and lasting one first special time, adjust this second signal value and make it identical, change according to ambient light illumination and adjust this display brightness automatically to required brightness with the 3rd signal value.
By in conjunction with of the explanation of following accompanying drawing, can further understanding be arranged to the present invention to embodiments of the invention.
Description of drawings
Fig. 1 shows two kinds of main light sources that eyes can be seen when using LCD;
Fig. 2 has shown the portable computer structural representation of using the technology of the present invention;
Fig. 3 is the system block diagrams of portable computer shown in Figure 2;
Fig. 4 has shown that system of the present invention starts under (the automatic energy-saving pattern is closed) at optical sensor, adjusts the process flow diagram of display brightness with manual mode;
Fig. 5 has shown that system of the present invention (the automatic energy-saving pattern is closed) under optical sensor starts adjusts the process flow diagram of display brightness in automatic adjustment mode;
Fig. 6 has shown that system of the present invention (the automatic energy-saving pattern is closed) under optical sensor starts adjusts another embodiment process flow diagram of display brightness in automatic adjustment mode;
Fig. 7 has shown the table of comparisons of ambient light illumination to the display brightness setting value;
Fig. 8 is the curve map of the ambient light illumination of this display to the display brightness setting value;
Fig. 9 is the curve map of the ambient light illumination of this display to the display brightness setting value; With
Figure 10 is the ambient light illumination of this display and this display brightness variation diagram to the time.
The drawing reference numeral explanation
10: portable computer 11: main body
11a: keyboard 12: panel of LCD
13: lid 14: optical sensor
200: central processing unit 202: random-access memory (ram)
204: intednsity circuit 206: other input/output device
208: bus 210: connecting line
212: circuit 214: analogue-to-digital converters
216: control circuit
A: environment light source
B: backlight
S11-S16: system of the present invention starts under (the automatic energy-saving pattern is closed) at optical sensor, adjusts the process step of display brightness with manual mode
S21-S26: system of the present invention (the automatic energy-saving pattern is closed) under optical sensor starts adjusts the process step of display brightness in automatic adjustment mode
S31-S38: system of the present invention (the automatic energy-saving pattern is closed) under optical sensor starts adjusts another process step of display brightness in automatic adjustment mode.
Embodiment
Fig. 2 shows the portable computer structural representation of using the technology of the present invention.As shown in Figure 2, portable computer 10 structures comprise: a main body 11, have lid 13 parts that a keyboard 11a, a panel of LCD 12 are arranged at this portable computer 10, and at least one optical sensor 14 is arranged on the lid 13 and contiguous panel of LCD 12.Wherein, optical sensor 14 can detect the ambient light illumination that exposes to panel of LCD 12, and converts it into the first signal value V1 that represents this ambient light illumination.In addition, the brightness settings that the user selectes can be by classic method (for example hot key on the keyboard 11a or other adjusting gear) input portable computer 10, and be stored in the storer, so that the user can manual mode adjusts the display brightness of panel of LCD 12.
Fig. 3 is the system block diagrams of portable computer shown in Figure 2.As shown in Figure 3, portable computer 10 comprises: a central processing unit 200, random-access memory (ram) 202, intednsity circuit 204 and other input/output device 206, for example keyboard 11a (Fig. 1) can be electrically connected to each other by bus 208.In this embodiment, intednsity circuit 204 has the ability of storer and processing computing.The output of intednsity circuit 204 is electrically connected on backlight drive circuit (Backlight drivercircuitry) (not shown), is sent to panel of LCD 12 to adjust or the control display brightness with brightness or the generation brilliance control signal (BC) of controlling panel of LCD 12 at any time via connecting line 210.
In addition, the first signal V1 (representative exposes to the ambient light illumination on the display pannel 12) that optical sensor 14 is produced is sent to analogue-to-digital converters 214 (A/D converter) by circuit 212, to carry out the signal conversion.Then, being sent to intednsity circuit 204 with execution S/W application program with the signal after will changing through control circuit 216 handles.Certainly, optical sensor 14 can be infrared ray sensor, UV sensor, Charged Coupled Device sensor or photoresistance sensor etc.
In system of the present invention, can be set into a plurality of ambient light illuminations interval according to the ambient light illumination scope of display, and the interval corresponding set monitor brightness settings V3 of each ambient light illumination.Wherein, the interval number in the spacing in each ambient light illumination interval and ambient light illumination interval can be set and be adjusted by the user, and display brightness setting value V3 also can be set by the user.Such relationship frame becomes an ambient light illumination to the display brightness setting value table of comparisons and be stored in the storer of intednsity circuit 204.Therefore, when optical sensor 14 detects the ambient light illumination that exposes to panel of LCD 12 and produces the first signal value V1 accordingly, handle this signal is sent to intednsity circuit through A/D converter 214, control circuit 216 and execution SW application program.Then, after intednsity circuit 204 utilizes ambient light illumination that the LCD brightness setting value table of comparisons is handled, the brilliance control signal that is produced by this intednsity circuit 204 is sent to backlight drive circuit, to adjust panel of LCD 12 to required brightness.
By said system, the present invention can manual adjustment and/or photosensor senses adjust mode such as display brightness automatically and carry out, so panel of LCD 12 can according to manual setting value and ambient light illumination change and the brightness that changes display pannel 12 accordingly to required brightness settings.Manual adjustment and optical sensor auto brightness are adjusted mode and can be carried out synchronously when optical sensor starts.When manual adjustment was carried out synchronously with automatic adjustment mode, manual adjusting style can have precedence over automatic adjustment mode.In addition, also optical sensor can cut out, and system can only be carried out with manual mode.In addition, also can make manual adjustment close and only make the optical sensor unlatching certainly, so can be by automatic sensing of sensor and adjustment, to reach power saving and to make purposes such as visual experience is comfortable.On the other hand, also can only start automatic energy-saving (Auto-Dim) pattern, to save maximum electric energy.Below will narrate the display brightness of the technology of the present invention respectively and regulate flow process.
See also Fig. 4, it shows system of the present invention under optical sensor startup (the automatic energy-saving pattern is closed), adjusts the process flow diagram of display brightness with manual mode.Below about the explanation of Fig. 4, also please contrast the explanation of following Fig. 7, Fig. 8 and Fig. 9.
As shown in Figure 4, after panel of LCD 12 starts, at first activation optical sensor 14 with carry out the S/W application program and make the automatic energy-saving pattern close (Auto-Dim) (step S11).Then, obtain the first signal value V1, wherein this first signal value V1 representative exposes to the ambient light illumination (step S12) of display pannel 12.Subsequently, according to this ambient light illumination the display brightness setting value table of comparisons is judged what ambient light illumination interval this first signal value V1 is positioned at, and this first signal value V1 is converted to the 3rd signal value V3 by ambient light illumination to the display brightness setting value table of comparisons, wherein the 3rd signal value V3 representative is in the interval pairing display pannel brightness settings (step S13) of this ambient light illumination.
Then, as user during with manual mode adjustment or input brightness settings V4, intednsity circuit 204 can be obtained the brightness settings V4 (step S14) that the user sets at present.Then, judge whether the brightness settings V4 that the user sets at present equates (step S15) with the 3rd signal value V3.When the brightness settings V4 that sets at present as the user equates with the interval pairing brightness settings V3 of this ambient light illumination, then need not to adjust brightness settings V3 and proceed step S13.And the interval pairing brightness settings V3 of the brightness settings V4 that sets at present as the user and this ambient light illumination then makes the interval pairing brightness settings V3 of this ambient light illumination equate (step S16) with the brightness settings V4 that the user sets at present when unequal.Subsequently, repeat step S13 again.
See also Fig. 5, it shows system of the present invention (the automatic energy-saving pattern is closed) under optical sensor starts adjusts display brightness with automated manner process flow diagram.Below about the explanation of Fig. 5, also please contrast the explanation of following Fig. 7 and Figure 10.
As shown in Figure 5, after panel of LCD 12 starts, at first activation optical sensor 14 with carry out its application program and make the automatic energy-saving pattern close (Auto-Dim) (step S21).Then, obtain the first signal value V1 and the second signal value V2, wherein this first signal value V1 representative exposes to the ambient light illumination of display pannel 12, and this second signal value V2 then represents the brightness (step S22) of this display pannel 12.Subsequently, judge what ambient light illumination interval this first signal value V1 is positioned at, and this first signal value V1 is converted to the 3rd signal value V3 by ambient light illumination to the display brightness setting value table of comparisons, wherein the 3rd signal value V3 represents in the interval pairing display pannel brightness settings (step S23) of this ambient light illumination.
Then, judge the 3rd signal value V3 and this second signal value V2 whether identical (step S24).When the 3rd signal value V3 is identical with this second signal value V2, that is be illustrated under this ambient light illumination that to set the shown brightness of the brightness settings that shows and present display pannel identical, therefore keep this second signal value V2, intednsity circuit 204 will be sent to the backlight illumination circuit by the brilliance control signal and keep the present brightness of this display pannel 12 this moment, and repeating step S22.And when the 3rd signal value V3 and this second signal value V2 were different, repeating step S22-S24 behind the Td1 that waits for a period of time was to judge whether different and lasting one first special time (step S25) of the 3rd signal value V3 and this second signal value V2.Wherein, if when the 3rd signal value V3 and this second signal value V2 are still different behind step S25, assert different and lasting this first special time of this brightness settings V3 and this second signal value V2; If when the 3rd signal value V3 is identical with this second signal value V2 behind step S25, assert that the 3rd signal value V3 and this second signal value V2 are different and do not have this first special time of continuing.
Please consult Fig. 5 again, when assert different and lasting this first special time of the 3rd brightness value V3 and this second signal value V2, adjusting this second signal value V2 makes it identical with the 3rd setting value V3, the brightness that also is about to display pannel 12 is adjusted brightness according to the interval pairing brightness settings V3 of this ambient light illumination, just can adjust these display pannel 12 brightness by this automatically to required brightness (step S26).At this moment, intednsity circuit 204 is adjusted the second signal value V2 with stage ground makes it equate with brightness settings V3, to adjust brightness gradually, does not have the visual sense feeling of unexpected variation.In addition,, keep the second signal value V2, use the brightness of keeping this display when assert this brightness settings V3 and this second signal value V2 is different and do not have lasting this first special time.Subsequently, repeating step S22.
See also Fig. 6, it shows system of the present invention (the automatic energy-saving pattern is closed) under optical sensor starts adjusts display brightness with automated manner another embodiment process flow diagram.Below about the explanation of Fig. 6, also please contrast the explanation of following Fig. 7 and Figure 10.
As shown in Figure 6, after panel of LCD 12 starts, at first activation optical sensor 14 with carry out its application program and make the automatic energy-saving pattern close (Auto-Dim) (step S31).Then, obtain the first signal value V1 and the second signal value V2, wherein this first signal value V1 representative exposes to the ambient light illumination of display pannel 12, and this second signal value V2 then represents the brightness of this display pannel 12.Then, according to this ambient light illumination the brightness settings table of comparisons of LCD is judged what ambient light illumination interval this first signal value V1 and this second signal value V2 lay respectively at, and this first signal value V1 is converted to the 3rd signal value V3 by ambient light illumination to the LCD brightness setting value table of comparisons again, wherein the 3rd signal value V3 representative is in the interval pairing display brightness setting value (step S32) of this ambient light illumination.
Then, the ambient light illumination interval of judging this first signal value V1 whether with this second signal value V2 pairing ambient light illumination interval identical (step S33).When the ambient light illumination that ambient light illumination is interval and this second signal value V2 the is corresponding interval of this first signal value V1 is identical, after reexamining, keep this second signal value V2, the brightness of display is remained unchanged.And interval interval when different when the ambient light illumination of the first signal value V1 with the pairing ambient light illumination of the second signal value V2, judge whether the ambient light illumination interval of the first signal value V1 is higher than the second signal value V2 pairing ambient light illumination interval (step S34).
When the ambient light illumination interval of this first signal V1 is higher than the pairing ambient light illumination of second signal V2 interval, after reexamining step (step S35),, the ambient light illumination interval of this first signal V1 proceeds subsequent operation if then getting back to step S32 when not being higher than the pairing ambient light illumination of second signal V2 interval; When if the ambient light illumination interval of this first signal V1 is higher than the pairing ambient light illumination of second signal V2 interval, then carry out the operation that display brightness is adjusted according to step S24-S26 embodiment illustrated in fig. 5, to adjust display brightness, therefore repeat no more to desirable value (step S36).
Yet, when the ambient light illumination interval of this first signal V1 is lower than the pairing ambient light illumination of second signal V2 interval, increase the lower limit (step S37) in the pairing ambient light illumination of second signal interval, judge then whether the first signal V1 is positioned at the second signal V2 pairing ambient light illumination interval (step S38).If the first signal V1 is positioned at the pairing ambient light illumination of second signal V2 interval, then proceed step S32; If the first signal V1 not in the pairing ambient light illumination of second signal V2 interval, then proceeds step S35, to carry out the step of follow-up adjustment display to required brightness.
For further specifying the present invention, below with concrete example above-mentioned flow process is described respectively.See also Fig. 7, it shows the table of comparisons of ambient light illumination to the display brightness setting value.As shown in Figure 7, in the table of comparisons of ambient light illumination to the display brightness setting value, ambient light illumination V1 can be divided into a plurality of ambient light illuminations interval (interval I, II, III, IV...), and each ambient light illumination interval (interval I (0-L1), II (L1-L2), III (L2-L3), spacing IV...) can be set and adjust with total interval number according to the user.In addition, each ambient light illumination interval (interval I, II, III, IV...) corresponding to a display brightness setting value V3 (B1, B2, B3, B4...).
According to method for regulating brightness of display of the present invention, at first can obtain the first signal value V1 and the second signal value V2 earlier, that is obtain the ambient light illumination value V1 that exposes to display and the brightness value V2 of display.Then, judge the first signal value V1 be positioned at what ambient light illumination interval (interval I, II, III, IV...).Subsequently, utilize this table of comparisons to find out the interval pairing display brightness setting value V3 of this ambient light illumination.Then, judge whether the second signal value V2 equals this brightness settings V3.If the second signal value V2 equals the brightness that this brightness settings V3 then keeps display.If the second signal value V2 when being not equal to brightness settings V3, then behind the stand-by period Td1, obtains the first signal value V1 and the second signal value V2 more again, repeat abovementioned steps again after, judge whether the second signal value V2 equals this brightness settings V3.V3 when this second signal value V2 equals this brightness settings, the brightness of then still keeping display is constant; And when the second signal value V2 is not equal to brightness settings V3, then adjust the second signal value V2 step by step, and make it identical with brightness settings V3, change according to ambient light illumination and adjust this display brightness automatically to required brightness.
The ambient light illumination scope that present embodiment will expose to display pannel is divided into a plurality of intervals, and following for convenience of description is example with four ambient light illumination intervals.Please consult Fig. 7 again, each ambient light illumination interval is corresponding to the brightness settings of a display, and this brightness settings is maneuverable.In this embodiment, to increase according to the ambient light illumination of display or reduce to be divided into increases curve (as black curve) and reduces curve (as the light color curve), ambient light illumination scope according to this display is divided into first environment illumination district, second environment illumination district, the 3rd ambient light illumination district and illumination district, border, Fourth Ring, each ambient light illumination interval is corresponding to the required brightness settings of a display, wherein the required brightness settings of display is B1, B2, B3, B4, its pass is B1≤B2≤B3≤B4, and these display brightness setting values can independently dynamically be adjusted and set, when the ambient light illumination of this display increases to b by a, because so b remains unchanged less than this display brightness of L2, when if the ambient light illumination of this display increases to c by a, so because c can be adjusted into B3 automatically greater than this display brightness of L2.When the ambient light illumination of this display is reduced to b by c because b greater than L2 ' this display brightness remain unchanged, if when the ambient light illumination of this display is reduced to a by c because a less than L2 ' so this display brightness can be adjusted into B2 automatically.
See also Fig. 8, it is the curve map of the ambient light illumination of this display to the display brightness setting value.As shown in Figure 8, the ambient light illumination scope of this display is set at four ambient light illumination intervals, and each ambient light illumination interval is corresponding to a display brightness setting value, wherein the display brightness setting value is B1, B2, B3, B4.When the interval pairing display brightness setting value B2 of second environment illumination is adjusted into B2 ', because B2 ' is greater than B3, so the interval pairing display brightness setting value B3 of the 3rd ambient light illumination also can automatically be adjusted into B2 '.
See also Fig. 9, it is the curve map of the ambient light illumination of this display to the display brightness setting value.As shown in Figure 9, the ambient light illumination scope of this display is set at four ambient light illumination intervals, and each ambient light illumination interval is corresponding to a display brightness setting value, wherein the display brightness setting value is B1, B2, B3, B4.When the 3rd ambient light illumination district pairing display brightness setting value B3 is adjusted into B3 ', because B3 ' is less than B2, so second environment illumination district pairing display brightness setting value B2 also can be adjusted into B3 ' automatically.
See also Figure 10, it is the ambient light illumination of this display and this display brightness variation diagram to the time.As shown in figure 10, the ambient light illumination of display is reduced to illumination a by illumination c when time t1, and the ambient light illumination of display becomes original c again again when time t2, and the similar fluorescent tube of this situation glimmers or has the shadow to walk about.Though the ambient light illumination a of display is less than L2 ', the ambient light illumination of display changes and does not continue one first special time, so that display brightness is kept B3 is constant, so display brightness can not change because of the temporary transient variation of display environment illumination.
Please consult Figure 10 again, the ambient light illumination of display is reduced to a by c when time t3, the ambient light illumination a of display is less than L2 ', and the ambient light illumination of display changes this first special time Td1 of continuing, so when time t4, display brightness graduates into B2 by B3, so the adjustment of display brightness does not have acute variation immediately.In addition, the ambient light illumination of display increases to c by a when time t6, and the ambient light illumination c of display is greater than L2.Because the ambient light illumination of display changes this first special time Td1 of continuing is arranged, so when time t7, display brightness graduates into B3 by B2, so the adjustment of display brightness does not have acute variation immediately.
The present invention is a kind of method for regulating brightness of display, be used for this display changing the display brightness adjust this display automatically according to ambient light illumination, and display brightness control system can not adjusted the display brightness of this display immediately because temporary transient variation of ambient light illumination.In addition, the brightness of the display of adjusting by the inventive method is to increase gradually or reduce, so the display brightness of this display does not have acute variation immediately.
The present invention can do some modifications under the premise of without departing from the spirit of the present invention by those skilled in the art, but the modification of being done is still within the protection domain of the application's claim.
Claims (17)
1. display auto brightness control method, it is applied in the display to change the display brightness of adjusting this display automatically according to ambient light illumination, and the method comprising the steps of:
(a) obtain one first signal value, this first signal value is represented the ambient light illumination of this display;
(b) obtain one second signal value, this second signal value is represented the brightness of this display;
(c) this first signal value is converted to one the 3rd signal value, wherein the 3rd signal value is represented the required brightness settings of this display;
(d) judge whether the 3rd signal value is identical with this second signal value; And
(e) when the 3rd signal value is identical with this second signal value, keep this second signal value, use and keep the present brightness of this display, and when the 3rd signal value and this second signal value during different and lasting one first special time, adjusting this second signal value makes it identical with the 3rd signal value, automatically adjust this display brightness to required brightness according to the ambient light illumination variation
Wherein step (c) comprises step:
(c1) the ambient light illumination scope with this display is set at a plurality of intervals, and each ambient light illumination interval is corresponding to the required brightness settings of a display; And (c2) judge what ambient light illumination interval is this first signal value be positioned at, and
This first signal value is converted to the 3rd signal value, and wherein the 3rd signal value represents this first signal value in the required brightness settings of the interval pairing display of this ambient light illumination.
2. display auto brightness control method as claimed in claim 1, wherein this step (a) also comprises step: an optical sensor is provided, produces this first signal value in order to the ambient light illumination that detects this display.
3. display auto brightness control method as claimed in claim 2, wherein this optical sensor is infrared ray sensor, UV sensor, Charged Coupled Device sensor or photoresistance sensor.
4. display auto brightness control method as claimed in claim 1, wherein the required brightness settings of the interval pairing display of each ambient light illumination is not less than the required brightness settings of the interval pairing display of last ambient light illumination.
5. display auto brightness control method as claimed in claim 1, wherein the required brightness settings of the interval pairing display of each ambient light illumination can independently dynamically be adjusted and set.
6. display auto brightness control method as claimed in claim 1, wherein this step (e) also comprises step:
(e1) when the 3rd signal value and this second signal value are different, wait for that one second special time repeats this step (a)-(d) again; And
(e2) if when the 3rd signal value and this second signal value are still different, assert different and lasting this first special time of the 3rd signal value and this second signal value, if the 3rd signal value when identical with this second signal value, is assert the 3rd signal value with this second signal value is different and lasting this first special time of nothing.
7. display auto brightness control method as claimed in claim 6, wherein this step (e2) also comprises step afterwards:
(e3) when assert different and lasting this first special time of the 3rd signal value and this second signal value, adjust this second signal value and make it identical, to adjust extremely required brightness of the present brightness of this display with the 3rd signal value; And
(e4) when assert the 3rd signal value and this second signal value is different and lasting this first special time of nothing, keep the second signal value, use the brightness of keeping this display.
8. display auto brightness control method as claimed in claim 7, wherein this step (e3) also comprises step: comply with interval stage of this ambient light illumination and adjust this second signal value, identical until this second signal value with the 3rd signal value.
9. display auto brightness control method, it is applied in the display to change the brightness of adjusting this display automatically according to ambient light illumination, and the method comprising the steps of:
(a) the ambient light illumination scope with this display is set at a plurality of intervals, and wherein each ambient light illumination interval is corresponding to a display brightness setting value;
(b) obtain one first signal value, this first signal value is represented the ambient light illumination of this display;
(c) obtain one second signal value, this second signal value is represented the brightness of this display;
(d) judge what ambient light illumination interval this first signal value and this second signal value are positioned at, and this first signal value is converted to one the 3rd signal value, wherein the 3rd signal value represents this first signal value in the interval pairing display brightness setting value of this ambient light illumination;
(e) judge whether the ambient light illumination interval of this first signal value is identical with the ambient light illumination interval of this second signal value;
When (f) interval ambient light illumination interval with this second signal value when the ambient light illumination of this first signal value is identical, keep this second signal value, use and keep the present brightness of this display, and interval ambient light illumination with this second signal value when the ambient light illumination of this first signal value is interval when different, judges whether the ambient light illumination interval of this first signal value is higher than the pairing ambient light illumination of this second signal value interval;
(g) when the ambient light illumination interval of this first signal value is higher than the pairing ambient light illumination of this second signal value interval, judge whether the 3rd signal value equates with this second signal value; And
(h) when the 3rd signal value is identical with this second signal value, keep this second signal value, use and keep the present brightness of this display, and when the 3rd signal value and this second signal value during different and lasting one first special time, adjust this second signal value and make it identical, change according to ambient light illumination and adjust this display brightness automatically to required brightness with the 3rd signal value.
10. display auto brightness control method as claimed in claim 9, wherein this step (b) also comprises step: an optical sensor is provided, produces this first signal value in order to the ambient light illumination that detects this display.
11. display auto brightness control method as claimed in claim 10, wherein this optical sensor is infrared ray sensor, UV sensor, Charged Coupled Device sensor or photoresistance sensor.
12. display auto brightness control method as claimed in claim 9, wherein the required brightness settings of the interval pairing display of each ambient light illumination is not less than the required brightness settings of the interval pairing display of last ambient light illumination.
13. display auto brightness control method as claimed in claim 9, wherein the required brightness settings of the interval pairing display of each ambient light illumination can independently dynamically be adjusted and set.
14. display brightness control method as claimed in claim 9, wherein this step (g) also comprises step:
(g1) when the ambient light illumination interval of this first signal value is lower than the pairing ambient light illumination of this second signal value interval, increase the interval lower limit of the pairing ambient light illumination of this second signal value, and judge whether the ambient light illumination of this first signal value is positioned at the pairing ambient light illumination of this second signal value interval; And
(g2) when the ambient light illumination of this first signal value is positioned at the pairing ambient light illumination of this second signal value interval, keep this second signal value, use and keep the present brightness of this display, and when the ambient light illumination of this first signal value is not when being positioned at the pairing ambient light illumination of this second signal value interval, to judge whether the 3rd signal value is identical with this second signal value.
15. display auto brightness control method as claimed in claim 9, wherein this step (h) also comprises step:
(h1) when the 3rd signal value and this second signal value are different, wait for that one second special time repeats this step (b)-(g) again; And
(h2) if when the 3rd signal value and this second signal value are still different, assert different and lasting this first special time of the 3rd signal value and this second signal value, if the 3rd signal value when identical with this second signal value, is assert the 3rd signal value with this second signal value is different and lasting this first special time of nothing.
16. display auto brightness control method as claimed in claim 15, wherein this step (h2) also comprises step afterwards:
(h3) when assert different and lasting this first special time of the 3rd signal value and this second signal value, adjust this second signal value and make it identical, to adjust extremely required brightness of the present brightness of this display with the 3rd signal value; And
(h4) when assert the 3rd signal value and this second signal value is different and lasting this first special time of nothing, keep the second signal value, use the brightness of keeping this display.
17. display auto brightness control method as claimed in claim 16, wherein this step (h3) also comprises step: comply with interval stage of this ambient light illumination and adjust this second signal value, and identical until this second signal value with the 3rd signal value.
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| CNB2003101165234A CN100341046C (en) | 2003-11-14 | 2003-11-14 | Automatic brigtness control method for display |
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| CN100341046C true CN100341046C (en) | 2007-10-03 |
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| KR101396976B1 (en) | 2007-07-26 | 2014-05-20 | 엘지전자 주식회사 | Display device and Method for controlling to display specific article on the display device |
| CN101777334B (en) * | 2010-01-23 | 2012-02-08 | 朱子辰 | Display terminal with automatic brightness adjusting function and brightness memory function |
| US20120062551A1 (en) * | 2010-09-13 | 2012-03-15 | Lg Electronics Inc. | Image display apparatus and method for operating image display apparatus |
| CN102447918B (en) * | 2010-10-08 | 2015-02-04 | 宏碁股份有限公司 | Method for controlling stereo glasses, stereo glasses and video display device |
| CN108519809B (en) * | 2011-11-28 | 2021-05-18 | 联想(北京)有限公司 | Display method and electronic device |
| DE102011088760A1 (en) * | 2011-12-15 | 2013-06-20 | Robert Bosch Gmbh | Display device e.g. LCD device for navigation apparatus used in passenger car, has control unit to set image contrast of display surface for display of image signals based on measurement value of light sensor |
| CN103247281B (en) * | 2012-02-13 | 2015-11-25 | 联想(北京)有限公司 | A kind of method and electronic equipment adjusting display brightness |
| CN103021337A (en) * | 2012-12-20 | 2013-04-03 | 高炎华 | Light-emitting diode (LED) display device with brightness adjusting device |
| CN104064162B (en) * | 2013-03-21 | 2017-03-15 | 深圳迈瑞生物医疗电子股份有限公司 | Automated external defibrillator and its brightness of display screen control method and device |
| CN103198792A (en) * | 2013-03-28 | 2013-07-10 | 无锡市崇安区科技创业服务中心 | Light ray control light-emitting diode (LED) display screen |
| CN104252327A (en) * | 2013-06-27 | 2014-12-31 | 腾讯科技（深圳）有限公司 | Reading mode start method and device |
| CN103606366A (en) * | 2013-11-08 | 2014-02-26 | 桂林机床电器有限公司 | Outdoor display screen brightness self adjusting method |
| CN105308674A (en) * | 2014-03-13 | 2016-02-03 | 华为终端有限公司 | Backlight brightness regulation method and electronic device |
| CN105654908A (en) * | 2015-11-06 | 2016-06-08 | 乐视移动智能信息技术（北京）有限公司 | Brightness change control method and apparatus thereof |
| CN105869606A (en) * | 2015-12-14 | 2016-08-17 | 乐视移动智能信息技术（北京）有限公司 | Screen brightness regulating method and device |
| CN105469775A (en) * | 2016-01-29 | 2016-04-06 | 广东欧珀移动通信有限公司 | Method for adjusting brightness of display screen and terminal equipment |
| CN108346411A (en) * | 2017-01-22 | 2018-07-31 | 中兴通讯股份有限公司 | A kind of back light brightness regulating method, device and terminal |
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