CN106782298A - A kind of brightness adjusting method of LED display screen system - Google Patents
A kind of brightness adjusting method of LED display screen system Download PDFInfo
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- CN106782298A CN106782298A CN201710033425.6A CN201710033425A CN106782298A CN 106782298 A CN106782298 A CN 106782298A CN 201710033425 A CN201710033425 A CN 201710033425A CN 106782298 A CN106782298 A CN 106782298A
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- brightness
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/06—Adjustment of display parameters
- G09G2320/0626—Adjustment of display parameters for control of overall brightness
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
- Control Of El Displays (AREA)
Abstract
The present invention relates to a kind of brightness adjusting method of LED display screen system, LED display screen system includes the input signal end of regulation brightness, PWM controller and PWM signal generator, and is used to produce the LED power driver of the back facet current of LED；The method is based on LED display screen system and realizes being adjusted LED display brightness, comprises the following steps：The corresponding relation of S1, the dutycycle for obtaining PWM controller and LED display physical brightness；S2, the Regulate signal and current dutycycle that obtain input signal end, according to Regulate signal multilevel iudge and set the dutycycle of PWM controller output；S3, the pwm signal for generating corresponding LED display physical brightness by PWM signal generator according to dutycycle；High accuracy brightness regulation is realized, LED display brightness can be transferred to extremely low, human eye can recognize the content on LED display in the environment of very dark and incandescent.
Description
Technical field
The invention belongs to field of photoelectric technology, a kind of brightness adjusting method of LED display screen system is specifically related to, be applicable
In the brightness regulation to portable equipment and the LED display of various terminal equipment.
Background technology
Currently for portable equipment and various terminal equipment, such as mobile phone, panel computer, notebook computer etc., at night
Under dark surrounds, even if its screen intensity is transferred to minimum also very dazzling, the screen light of the high-contrast under this dark surrounds
Line can cause greatly to stimulate and injure to human eye, while influencing whether periphery personnel.However, due to numerous and diverse difficulty technically
Degree, and high development cost, do not have corresponding technical measures to solve the problem at present
In the market, especially on the mobile apparatus, there was only several ranks to more than ten rank (ranks in brightness regulation：From most secretly to
The most bright number of times for needing to adjust, such as passes through button), and the regulation of more low-light level cannot be realized.It is in fact this can be bright by screen
It is many that degree is transferred to the low demand of the limit, but because its technical complexity causes not good implementation.Than if any mobile phone
Reader releases night mode, and the stimulation to human eye is reduced simply by adjustment reader background color in itself, only exists
Seem under this reading environment than milder, but leave reader and remain unchanged and become dazzling, do not tackle the problem at its root.
Even there are many demands to general dark surrounds, night, underground no light conditions in specific environment such as space,
No light conditions of closing etc., this demand is just more protruded, if brightness reaches more than 15nits in darker environment,
Human eye is closely watched cannot even more bear the stimulation of this light.
Under this requirement background, we take the lead in, into the research and development in the field, referring to and realizing the display of extremely low brightness
Technology, the technology can wait until industry with large-scale application to from consumer mobile phone, panel computer, notebook computer, desktop computer
All kinds of products containing display screen of electronic flight terminal, vehicle-mounted computer, the heavy duty service terminal of application etc., solve current row
Blank problem in the industry, and realize high industrial value.
The content of the invention
Based on the problem of present technology, we have proposed a kind of brightness adjusting method of LED display screen system, realize high-precision
, can be transferred to for LED display brightness extremely low by degree brightness regulation, and human eye can recognize that LED shows in the environment of very dark and incandescent
Content in display screen.
The present invention is achieved by the following technical solutions.
A kind of brightness adjusting method of LED display screen system is provided, LED display screen system includes the input of regulation brightness
Signal end, PWM controller and PWM signal generator, and it is used to produce the LED power driver of the back facet current of LED；Should
Method is based on LED display screen system and realizes being adjusted LED display brightness, comprises the following steps：
The corresponding relation of S1, the dutycycle for obtaining PWM controller and LED display physical brightness；
S2, the Regulate signal and current dutycycle that obtain input signal end, according to Regulate signal multilevel iudge and are set
The dutycycle of PWM controller output；
S3, the pwm signal for generating corresponding LED display physical brightness by PWM signal generator according to dutycycle；
S4, the brightness for adjusting display backlight LED by LED power driver according to pwm signal.
Further, the S1 steps also include being configured in advance the dutycycle and LED display physics of PWM controller
The corresponding relation of brightness, specifically, dutycycle 100% is corresponded to by the maximum of the physical brightness of display screen, will be shown
The minimum value of the physical brightness of screen corresponds to dutycycle 0%, and physical brightness is calculated with dutycycle using piecewise fitting mode
Corresponding relation.
Further, the dutycycle that PWM controller output is set in the S2 steps be by PWM cycle register and
The realization of PWM comparand registers, specifically PWM duty cycle=PWM comparand registers value/PWM cycle register value, wherein PWM weeks
Phase register value is fixed value, sets the dutycycle that PWM comparand registers value sets PWM controller output to reach；
Further, described PWM controller is the PWM controller of resolution ratio 13bit；The input signal end includes machine
Tool key-press module, and the software adjustment key-press module under system is realized based on I2C or UART communication interfaces
The technical scheme is that the micro-control regulation technology of LED brightness, can be by brightness of display screen brightness regulation
To extremely low, make LED display in dark surrounds, be still clear that screen content, do not affect human eye vision, together
When injury is not almost stimulated to human eye；It is mainly used in being equipped with the equipment of LED display, the people in the environment of very dark and incandescent
Eye can recognize the content on LED display.
Brief description of the drawings
Fig. 1 is the structured flowchart of the LED display screen system in the embodiment of the present invention.
Fig. 2 is the flow chart of the LED display screen system regulation brightness in the embodiment of the present invention.
Fig. 3 is physical brightness and PWM duty cycle value linear relationship chart in the embodiment of the present invention.
Fig. 4 is the software processing flow figure of the LED display screen system in the embodiment of the present invention.
Specific embodiment
Technical scheme is described in further details with specific embodiment below in conjunction with accompanying drawing, so that ability
The technical staff in domain can understand complete understanding technology contents of the invention.
Shown in reference picture 1, the brightness adjusting method of the present embodiment is the LED display screen system based on display terminal, and LED shows
Display screen system includes the machinery of PWM controller, PWM generator, LED power driver and the input as Regulate signal
Button, mechanical key can also realize that the software adjustment button under system is substituted by I2C or UART communication interfaces.
PWM controller, with programmable functions, the code of software section will be burnt using the up to PWM controller of 13bit
Record in the ROM of controller, PWM generator calculates corresponding pwm signal group LED power driver in accordance with the law by PWM controller,
LED power driver goes out the pwm signal of duty ratio corresponding according to group to adjust the back facet current of LED, so as to realize brightness
Increased or decrease, and the BIT high of PWM greatly improves the precision of dutycycle, realizes high-resolution brightness regulation scope.Point is empty
Than refer to PWM a pulse cycle in ratio shared by conduction time.
Shown in reference picture 2, brightness regulation process mainly comprises the following steps S1, S2, S3 and S4；
The corresponding relation of S1, the dutycycle for obtaining PWM controller and LED display physical brightness；
First have to be configured in advance the corresponding relation of the dutycycle with LED display physical brightness of PWM controller, PWM
The output impulse wave of controller is numeral output, be exactly its amplitude only have high level " 1 " and low level " 0 " point, to generate
Cycle is the pulse of T, it is possible to controls its output end output " 1 " using mcu programming instruction, and keeps a period of time Tp,
Then bottom level " 0 " is exported again, equally makes it be kept for a period of time Tr complete the impulse wave of a cycle T, and pwm pulse ripple is
Dutycycle can be adjusted.Dutycycle is to criticize the ratio that half cycle pulsewidth accounts for whole cycle, i.e., high-level retention time is in the cycle
Ratio Tp/T*100%, T are the pulse period, and the ratio is percentage, therefore in the case where the cycle is certain, regulation dutycycle is just
It is to adjust the time that high level keeps；
One initial p WM dutycycle of setting before starting, impulse wave is to go to determine impulse wave using single-chip microcomputer Interruption
Cycle, and by mechanical key from increase and subtract certainly certain variable deliver to interruption in, according to current dutycycle pass through this variable
Go to distribute the time that low and high level is each accounted for, to form different dutycycles, duty cycle adjustment scope, will in 0%-100%
Its backlight voltage for corresponding to LED power driver output, dutycycle is that the backlight voltage of 0% correspondence output is 0, and dutycycle is
The backlight voltage of 100% correspondence output is the maximum operating voltage of LED backlight circuit or electric current, and difference is corresponding to be exactly
Display screen is exactly most dark and most bright degree；
The maximum of the physical brightness of display screen is specifically corresponded into dutycycle 100%, by the physical brightness of display screen
Minimum value correspond to dutycycle 0%, the corresponding relation of physical brightness and dutycycle is calculated using piecewise fitting mode, typically
Think that physical brightness is simple linear relationship with PWM duty cycle value, shown in reference picture 3.
S2, the Regulate signal and current dutycycle that obtain input signal end, according to Regulate signal multilevel iudge and are set
The dutycycle of PWM controller output；The PWM duty cycle of output, is to compare deposit by setting PWM cycle register and PWM
Device realization, PWM duty cycle=PWM comparand registers/PWM cycle register.It is by PWM for comparing to determine for Regulate signal
Interior software is realized, shown in reference picture 3, software processing flow mainly includes that step is as follows：
S201, the instruction for setting brightness for obtaining input signal end, determine whether to increase the short button of brightness, are to enter
Enter S202 steps, otherwise into S211 steps；
Whether S202, the dutycycle of the current output of acquisition are less than 100%, are then to enter S203 steps, otherwise keep duty
Than constant；
S203, the dutycycle increase by 1% by current output, reach increase LED display physical brightness.
S211, the instruction for setting brightness for obtaining input signal end, determine whether to increase the long keying of brightness, are to enter
Enter S212 steps, otherwise into S221 steps；；
Whether S212, the dutycycle of the current output of acquisition are less than 95%, are then to enter S213 steps, otherwise keep dutycycle
It is constant；
S213, the dutycycle increase by 5% by current output, reach increase LED display physical brightness.
S221, the instruction for setting brightness for obtaining input signal end, determine whether to reduce the short button of brightness, are to enter
Enter S222 steps, otherwise into S231 steps；；
Whether S222, the dutycycle of the current output of acquisition are more than 0%, are then to enter S223 steps, otherwise keep dutycycle
It is constant；
S223, the dutycycle reduction by 1% by current output, reach reduction LED display physical brightness.
S231, the instruction for setting brightness for obtaining input signal end, determine whether to reduce the long keying of brightness, are to enter
Enter S232 steps；
Whether S232, the dutycycle of the current output of acquisition are more than 5%, are then to enter S233 steps, are otherwise walked into S234
Suddenly, the dutycycle otherwise by current output is set to 0%；
S233, the dutycycle reduction by 5% by current output, reach reduction LED display physical brightness.S3, according to duty
Than the pwm signal that corresponding LED display physical brightness is generated by PWM signal generator；
The input button of Regulate signal can be that mechanical key can also be touch controlled key, the acquiescence output signal of button
Generally high level, often triggers one-touch and just exports a negative pulse Regulate signal to PWM controller, according to the low electricity of negative pulse
The flat time is further divided into two kinds of short button and long keying, and the pulse signal for then producing sends PWM controller, PWM controls to
Device processed will pass through software after a pulse signal is received and judge and set dutycycle, then control PWM generator generation one right
The pwm signal of pulsewidth is answered to LED power driver.
S4, the brightness for adjusting display backlight LED by LED power driver according to pwm signal；LED power driver
For the electric current for producing LED to need, the size of electric current directly affects the brightness of LED, and its circuit part is general LED
Backlight circuit, mainly by PWM inputs, Enable Pin, Boost switch output ends, inductance, diode, LED power output end
And the composition such as the feedback end of LED.
More than, the only present invention preferably specific embodiment, but protection scope of the present invention is not limited thereto, any
Those familiar with the art the invention discloses technical scope in, the change or replacement that can be readily occurred in, all should
It is included within the scope of the present invention.Therefore, protection scope of the present invention should be with the protection domain of claims
It is accurate.
Claims (8)
1. a kind of brightness adjusting method of LED display screen system, it is characterised in that LED display screen system includes regulation brightness
Input signal end, PWM controller and PWM signal generator, and be used to produce the LED power of the back facet current of LED and drive
Dynamic device；The method is based on LED display screen system and realizes being adjusted LED display brightness, comprises the following steps：
The corresponding relation of S1, the dutycycle for obtaining PWM controller and LED display physical brightness；
S2, the Regulate signal and current dutycycle that obtain input signal end, according to Regulate signal multilevel iudge and set PWM controls
The dutycycle of device output processed；
S3, the pwm signal for generating corresponding LED display physical brightness by PWM signal generator according to dutycycle；
S4, the brightness for adjusting display backlight LED by LED power driver according to pwm signal.
2. the brightness adjusting method of LED display screen system according to claim 1, it is characterised in that the S1 steps are also
Including being configured the dutycycle of PWM controller and the corresponding relation of LED display physical brightness in advance, specifically, will
The maximum of the physical brightness of display screen corresponds to dutycycle 100%, and the minimum value of the physical brightness of display screen is corresponded to account for
Sky compares 0%, and the corresponding relation of physical brightness and dutycycle is calculated using piecewise fitting mode.
3. the brightness adjusting method of the LED display screen system according to claim or 1 or 2, it is characterised in that the S2 steps
The dutycycle that PWM controller output is set in rapid is realized by PWM cycle register and PWM comparand registers, specifically PWM
Dutycycle=PWM comparand registers value/PWM cycle register value, wherein PWM cycle register value are fixed value, set PWM ratios
The dutycycle that PWM controller is exported is set to reach compared with register value.
4. the brightness adjusting method of the LED display screen system according to claim or 1 or 2, it is characterised in that the S2 steps
Following steps are specifically included in rapid；
S201, the instruction for setting brightness for obtaining input signal end, determine whether to increase the short button of brightness, are to enter
S202 steps；
Whether S202, the dutycycle of the current output of acquisition are less than 100%, are then to enter S203 steps；
S203, the dutycycle increase by 1% by current output, reach increase LED display physical brightness.
5. the brightness adjusting method of the LED display screen system according to claim or 1 or 2, it is characterised in that the S2 steps
Following steps are specifically included in rapid；
S211, the instruction for setting brightness for obtaining input signal end, determine whether to increase the long keying of brightness, are to enter
S212 steps；
Whether S212, the dutycycle of the current output of acquisition are less than 95%, are then to enter S213 steps；
S213, the dutycycle increase by 5% by current output, reach increase LED display physical brightness.
6. the brightness adjusting method of the LED display screen system according to claim or 1 or 2, it is characterised in that the S2 steps
Following steps are specifically included in rapid；
S221, the instruction for setting brightness for obtaining input signal end, determine whether to reduce the short button of brightness, are to enter
S222 steps；
Whether S222, the dutycycle of the current output of acquisition are more than 0%, are then to enter S223 steps；
S223, the dutycycle reduction by 1% by current output, reach reduction LED display physical brightness.
7. the brightness adjusting method of the LED display screen system according to claim or 1 or 2, it is characterised in that the S2 steps
Following steps are specifically included in rapid；
S231, the instruction for setting brightness for obtaining input signal end, determine whether to reduce the long keying of brightness, are to enter
S232 steps；
Whether S232, the dutycycle of the current output of acquisition are more than 5%, are then to enter S233 steps, otherwise into S234 steps；
S233, the dutycycle reduction by 5% by current output, reach reduction LED display physical brightness.
S234, the duty of current output is set to 0%.
8. the brightness adjusting method of the LED display screen system according to claim or 1 or 2, it is characterised in that described
PWM controller is the PWM controller of resolution ratio 13bit；The input signal end includes mechanical key module, and based on I2C
Or UART communication interfaces realize the software adjustment key-press module under system.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710033425.6A CN106782298A (en) | 2017-01-18 | 2017-01-18 | A kind of brightness adjusting method of LED display screen system |
| PCT/CN2017/076091 WO2018133182A1 (en) | 2017-01-18 | 2017-03-09 | Luminance adjusting method for led display screen system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710033425.6A CN106782298A (en) | 2017-01-18 | 2017-01-18 | A kind of brightness adjusting method of LED display screen system |
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| Publication Number | Publication Date |
|---|---|
| CN106782298A true CN106782298A (en) | 2017-05-31 |
Family
ID=58947098
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| Application Number | Title | Priority Date | Filing Date |
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| CN201710033425.6A Pending CN106782298A (en) | 2017-01-18 | 2017-01-18 | A kind of brightness adjusting method of LED display screen system |
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| WO (1) | WO2018133182A1 (en) |
Cited By (11)
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| CN109767721A (en) * | 2018-04-04 | 2019-05-17 | 广州硅芯电子科技有限公司 | Method and apparatus for driving LED display |
| CN110895916A (en) * | 2018-09-20 | 2020-03-20 | 研祥智能科技股份有限公司 | System for adaptively setting output resolution of LVDS (Low Voltage differential Signaling) interface |
| CN110992901A (en) * | 2019-12-24 | 2020-04-10 | 太原航空仪表有限公司 | Backlight brightness control algorithm |
| CN112667188A (en) * | 2020-12-28 | 2021-04-16 | 长沙湘计海盾科技有限公司 | Display brightness control method, device, system, electronic terminal and readable storage medium |
| CN112669764A (en) * | 2020-12-25 | 2021-04-16 | 深圳市金研微科技有限公司 | Display brightness uniformity adjusting method |
| CN113936612A (en) * | 2021-11-01 | 2022-01-14 | 中航华东光电有限公司 | Device and method for setting backlight brightness of liquid crystal display based on calibrated brightness value |
| CN114078460A (en) * | 2020-08-20 | 2022-02-22 | 瑞鼎科技股份有限公司 | Unequal difference pulse width modulation dimming method |
| CN114220386A (en) * | 2021-11-25 | 2022-03-22 | 武汉海微科技有限公司 | MiniLed display screen brightness adjusting method conforming to human eye visual characteristics |
| CN114464144A (en) * | 2022-01-28 | 2022-05-10 | 昆山龙腾光电股份有限公司 | Brightness adjusting display method, brightness adjusting display system and liquid crystal display device |
| CN115484703A (en) * | 2022-10-31 | 2022-12-16 | 歌尔股份有限公司 | Remote controller backlight control method and device, remote controller and medium |
| CN115482793A (en) * | 2022-10-08 | 2022-12-16 | 广东夏野日用电器有限公司 | Display device and electronic apparatus facilitating focus adjustment through active brightness adjustment |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109767721B (en) * | 2018-04-04 | 2024-03-01 | 广州硅芯电子科技有限公司 | Method and apparatus for driving LED display screen |
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| CN110895916A (en) * | 2018-09-20 | 2020-03-20 | 研祥智能科技股份有限公司 | System for adaptively setting output resolution of LVDS (Low Voltage differential Signaling) interface |
| CN110992901A (en) * | 2019-12-24 | 2020-04-10 | 太原航空仪表有限公司 | Backlight brightness control algorithm |
| CN114078460A (en) * | 2020-08-20 | 2022-02-22 | 瑞鼎科技股份有限公司 | Unequal difference pulse width modulation dimming method |
| CN112669764A (en) * | 2020-12-25 | 2021-04-16 | 深圳市金研微科技有限公司 | Display brightness uniformity adjusting method |
| CN112669764B (en) * | 2020-12-25 | 2021-09-14 | 深圳市金研微科技有限公司 | Display brightness uniformity adjusting method |
| CN112667188A (en) * | 2020-12-28 | 2021-04-16 | 长沙湘计海盾科技有限公司 | Display brightness control method, device, system, electronic terminal and readable storage medium |
| CN113936612A (en) * | 2021-11-01 | 2022-01-14 | 中航华东光电有限公司 | Device and method for setting backlight brightness of liquid crystal display based on calibrated brightness value |
| CN114220386A (en) * | 2021-11-25 | 2022-03-22 | 武汉海微科技有限公司 | MiniLed display screen brightness adjusting method conforming to human eye visual characteristics |
| CN114464144A (en) * | 2022-01-28 | 2022-05-10 | 昆山龙腾光电股份有限公司 | Brightness adjusting display method, brightness adjusting display system and liquid crystal display device |
| CN115482793A (en) * | 2022-10-08 | 2022-12-16 | 广东夏野日用电器有限公司 | Display device and electronic apparatus facilitating focus adjustment through active brightness adjustment |
| CN115484703A (en) * | 2022-10-31 | 2022-12-16 | 歌尔股份有限公司 | Remote controller backlight control method and device, remote controller and medium |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2018133182A1 (en) | 2018-07-26 |
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Application publication date: 20170531 |
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| RJ01 | Rejection of invention patent application after publication |