CN109673077A - A kind of gamma correction system and its bearing calibration that LED luminance is adjusted - Google Patents
A kind of gamma correction system and its bearing calibration that LED luminance is adjusted Download PDFInfo
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- CN109673077A CN109673077A CN201811521851.5A CN201811521851A CN109673077A CN 109673077 A CN109673077 A CN 109673077A CN 201811521851 A CN201811521851 A CN 201811521851A CN 109673077 A CN109673077 A CN 109673077A
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/10—Controlling the intensity of the light
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
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Abstract
The invention discloses gamma correction systems and its bearing calibration that a kind of LED luminance is adjusted, the correction system includes single-chip microcontroller, light intensity sensor, correction data memory module, transformation from serial to parallel chip and LED light, the data that the corresponding human eye of different LED light linearly experiences the duty ratio of corresponding unit time are stored in correction data module, the control port of single-chip microcontroller is electrically connected with the input terminal of transformation from serial to parallel chip, the output end of transformation from serial to parallel chip is connected with LED light, single-chip microcontroller is used to that the data output in corresponding correction data module to be adjusted LED light by transformation from serial to parallel chip according to the intensity size of acquisition environment light.The present invention controls multiple multiple LED light of transformation from serial to parallel chip drives by serial ports, can carry out brightness change to any LED simultaneously.The data corrected will be needed to be stored in single-chip microcontroller, LED luminance is corrected, human eye is made to experience LED linear variation.
Description
Technical field
The invention belongs to electronic circuit technology fields, and in particular to a kind of gamma correction system that LED luminance is adjusted and
Its bearing calibration.
Background technique
Human eye has the non-linear impression of instinct to brightness, more sensitive for the bright variation impression of lower gray scale.Dim light
When, brightness doubles, and the change that human eye is felt is greater than one times；When strong light, brightness is doubled, the change that human eye is felt
Less than one times.When light source only has one third brightness, human eye feels to be about a half intensity.
LED has the advantages that energy conservation, low-power consumption, the service life is long as novel illumination beauty light source.LED luminance adjusts general
Modulated using PWM(pulse width) digital dimming mode.It shows in LED light, when output light flux changes linearly over time,
In low-light level, human eye may feel that the jump of brightness；In high brightness, human eye feels that brightness change is unobvious.Side herein
In formula, human eye to LED luminance linear change be experienced as it is nonlinear, so having to carry out school to this nonlinear impression
Just, that is, luminous flux change is compensated.
LED light source characteristic curve shows as the relationship by electric current and power.The power of LED and the P-I relationship of electric current are special
Linearity curve is substantially an approximate linear line, but when current is excessive, curve is relatively flat, that is, power increase is not
It is linear, this is because PN junction fever generates saturated phenomenon, makes the reduction of P-I slope of a curve.This phenomenon cause to
When LED linear electric current changes, it is non-linear that LED light impression, which changes,.
Therefore, a kind of gamma correction system and its bearing calibration that LED luminance is adjusted is needed.
Summary of the invention
In order to solve the above-mentioned technical problems, the present invention provides a kind of LED luminance adjust gamma correction system and its
Bearing calibration.
In order to achieve the above object, technical scheme is as follows:
The present invention provides a kind of gamma correction system that LED luminance is adjusted, including single-chip microcontroller, light intensity sensor, correction number
According to memory module, transformation from serial to parallel chip and LED light, the output end of the light intensity sensor and the input terminal of single-chip microcontroller are electrically connected
It connects for acquiring ambient light intensity, the correction data module is built in single-chip microcontroller, is stored in the correction data module
The corresponding human eye of different LED light linearly experiences the data of the duty ratio of corresponding unit time, the control port of the single-chip microcontroller with
The input terminal of transformation from serial to parallel chip is electrically connected, and the output end of the transformation from serial to parallel chip is connected with LED light, the single-chip microcontroller
For the data output in corresponding correction data module to be passed through transformation from serial to parallel chip according to the intensity size of acquisition environment light
Adjust LED light.
As a preferred option, the transformation from serial to parallel chip is an ICN2026 integrated chip and is sequentially connected electrically
Multiple ICN2026 integrated chips, the OUT0-OUT15 pin of the ICN2026 integrated chip is electrically connected with LED light respectively, on
The OUT1_IN2 pin of one ICN2026 integrated chip is electrically connected with the SIN mouth of next ICN2026 integrated chip.
As a preferred option, the present invention also provides the gamma correction systems that a kind of LED luminance is adjusted, including following step
It is rapid:
S1, show that the corresponding human eye of every kind of LED light linearly experiences the duty ratio of corresponding unit time according to experiment, by above-mentioned number
According in the correction data module for being stored in single-chip microcontroller memory；
S2, light intensity sensor incude the intensity of environment light and send single-chip microcontroller to；
S3, single-chip microcontroller are according to the intensity size of acquisition environment light by the data output in corresponding correction data module by serially turning
The C1 and C2 of parallel chip adjustment LED light, C1 and C2 meet following formula:
C1=d/(100*f*A*X)；
C2=(1/f-d/(100*f))/(A*X)
Wherein, d is the duty ratio of LED light, and f is the PWM frequency of LED light, and A is microcontroller serial port transmission speed, and X is to control
LED light number, C1 be transformation from serial to parallel chip need it is continuous issue the number that data bit is 1, C2 is transformation from serial to parallel core
Piece needs the continuous number for issuing data bit and being 0.
Specifically, the C1 and C2 in the step S3 calculating specifically includes the following steps:
For transformation from serial to parallel chip for each byte data to be sequentially output one by one, each byte is 8 positions, then this
Data can control eight LED by 0 and 1 change；
When microcontroller serial port transmission speed is A, transmission speed B=(8*A) of a byte；
If desired the number of the LED light controlled is X, then the byte number for needing to transmit is that Y=(X/8) is a；
In this way it can be concluded that the minimum time of transmission X LED light data of control is t=B*Y, i.e. t=A*X；
When it is 1 that the data for controlling LED light, which correspond to position, LED light is bright；When corresponding position is 0, LED goes out；
It needs to control the light on and off of LED light by changing the LED light turn-off time, that is, needs to change the PWM of control LED light；
By above it can be concluded that control LED light light on and off variation, that is, 0 and 1 variation the most fast time be t；
If the PWM frequency of LED light is f, the period of PWM is T=1/f, and the LED light bright time is then T1=T* (d/100), is gone out
Time is T2=T-T1；
It can be concluded that the bright number that single-chip microcontroller needs to issue data expression LED present bit in a PWM cycle is C1=T1/
t;The number to go out is C2=T2/t；
It to be so f, duty ratio d to the PWM frequency of LED, then it is 1 that transformation from serial to parallel chip, which needs the continuous data bit that issues,
Number C1=d/ (100*f*A*X)；It is C2=(1/f-d/ that transformation from serial to parallel chip, which needs the number that continuous sending data bit is 0,
(100*f))/(A*X)；
When output light flux changes linearly over time, the impression of human eye be not but it is linear, in LED glimmer area, lamps and lanterns very little
Luminous flux change also allows human eye to feel light intensity variation very greatly, and in the biggish region of light flux ratio, very big luminous flux jump, people
The light intensity variation that eye is felt is also little；
And human eye is to impression=luminous flux ^ (1/2.2) of brightness；
Impression of the human eye to brightness is indicated with F, and φ indicates luminous flux, F=φ ^ (1/2.2)；Wherein, φ ∝ D, D are PWM adjusting
The duty ratio of signal；
Linear brightness impression is by the φ for needing nonlinear change, due to φ and D Strict linear, therefore the brightness impression of linear change by
Need to defer to the φ of the nonlinear change of certain rule, this rule is exactly the corresponding nonlinear change φ of linear regulation, also
It is the anti-nonlinear characteristic that human eye brightness impression is received；
When controlling the duty ratio of PWM, φ value is stored in advance in correction data module by anti-espionage according to the rule of D=λ ^2.2
The φ value that property calculates, reaches correction purpose.
The invention has the following advantages: the present invention changes by force progress in the case where controlling multiple LED light to LED light
Linearity correction will use timer to generate duty ratio, be changed by changing duty ratio size when the use of controller being single-chip microcontroller
Become the brightness of LED.The present invention uses 8 single-chip microcontrollers, controls multiple multiple LED light of transformation from serial to parallel chip drives by serial ports,
Brightness change can be carried out to any LED simultaneously.The data corrected will be needed to be stored in single-chip microcontroller, school is carried out to LED luminance
Just, human eye is made to experience LED linear variation.
Specific embodiment
The following detailed description of the preferred embodiment of the present invention.
In order to reach the purpose of the present invention, a kind of LED luminance adjusting is provided in one of embodiment of the invention
Gamma correction system, including single-chip microcontroller, light intensity sensor, correction data memory module, transformation from serial to parallel chip and LED
Lamp, the output end of the light intensity sensor are electrically connected for acquiring ambient light intensity, the correction with the input terminal of single-chip microcontroller
Data module is built in single-chip microcontroller, and the corresponding human eye of different LED light is stored in the correction data module and is linearly experienced pair
The data of the duty ratio of unit time are answered, the control port of the single-chip microcontroller is electrically connected with the input terminal of transformation from serial to parallel chip,
The output end of the transformation from serial to parallel chip is connected with LED light, and the single-chip microcontroller is used for the intensity size according to acquisition environment light
Data output in corresponding correction data module is adjusted into LED light by transformation from serial to parallel chip.
In order to further optimize implementation result of the invention, in another embodiment of the invention, aforementioned interior
On the basis of appearance, the transformation from serial to parallel chip is an ICN2026 integrated chip and is sequentially connected electrically multiple
The OUT0-OUT15 pin of ICN2026 integrated chip, the ICN2026 integrated chip is electrically connected with LED light respectively, and upper one
The OUT1_IN2 pin of ICN2026 integrated chip is electrically connected with the SIN mouth of next ICN2026 integrated chip.
In order to further optimize implementation result of the invention, in another embodiment of the invention, aforementioned interior
On the basis of appearance, the present invention also provides the gamma correction systems that a kind of LED luminance is adjusted, comprising the following steps:
S1, show that the corresponding human eye of every kind of LED light linearly experiences the duty ratio of corresponding unit time according to experiment, by above-mentioned number
According in the correction data module for being stored in single-chip microcontroller memory；
S2, light intensity sensor incude the intensity of environment light and send single-chip microcontroller to；
S3, single-chip microcontroller are according to the intensity size of acquisition environment light by the data output in corresponding correction data module by serially turning
The C1 and C2 of parallel chip adjustment LED light, C1 and C2 meet following formula:
C1=d/(100*f*A*X)；
C2=(1/f-d/(100*f))/(A*X)
Wherein, d is the duty ratio of LED light, and f is the PWM frequency of LED light, and A is microcontroller serial port transmission speed, and X is to control
LED light number, C1 be transformation from serial to parallel chip need it is continuous issue the number that data bit is 1, C2 is transformation from serial to parallel core
Piece needs the continuous number for issuing data bit and being 0.
Specifically, the C1 and C2 in the step S3 calculating specifically includes the following steps:
For transformation from serial to parallel chip for each byte data to be sequentially output one by one, each byte is 8 positions, then this
Data can control eight LED by 0 and 1 change；
When microcontroller serial port transmission speed is A, transmission speed B=(8*A) of a byte；
If desired the number of the LED light controlled is X, then the byte number for needing to transmit is that Y=(X/8) is a；
In this way it can be concluded that the minimum time of transmission X LED light data of control is t=B*Y, i.e. t=A*X；
When it is 1 that the data for controlling LED light, which correspond to position, LED light is bright；When corresponding position is 0, LED goes out；
It needs to control the light on and off of LED light by changing the LED light turn-off time, that is, needs to change the PWM of control LED light；
By above it can be concluded that control LED light light on and off variation, that is, 0 and 1 variation the most fast time be t；
If the PWM frequency of LED light is f, the period of PWM is T=1/f, and the LED light bright time is then T1=T* (d/100), is gone out
Time is T2=T-T1；
It can be concluded that the bright number that single-chip microcontroller needs to issue data expression LED present bit in a PWM cycle is C1=T1/
t;The number to go out is C2=T2/t；
It to be so f, duty ratio d to the PWM frequency of LED, then it is 1 that transformation from serial to parallel chip, which needs the continuous data bit that issues,
Number C1=d/ (100*f*A*X)；It is C2=(1/f-d/ that transformation from serial to parallel chip, which needs the number that continuous sending data bit is 0,
(100*f))/(A*X)；
When output light flux changes linearly over time, the impression of human eye be not but it is linear, in LED glimmer area, lamps and lanterns very little
Luminous flux change also allows human eye to feel light intensity variation very greatly, and in the biggish region of light flux ratio, very big luminous flux jump, people
The light intensity variation that eye is felt is also little；
And human eye is to impression=luminous flux ^ (1/2.2) of brightness；
Impression of the human eye to brightness is indicated with F, and φ indicates luminous flux, F=φ ^ (1/2.2)；Wherein, φ ∝ D, D are PWM adjusting
The duty ratio of signal；
Linear brightness impression is by the φ for needing nonlinear change, due to φ and D Strict linear, therefore the brightness impression of linear change by
Need to defer to the φ of the nonlinear change of certain rule, this rule is exactly the corresponding nonlinear change φ of linear regulation, also
It is the anti-nonlinear characteristic that human eye brightness impression is received；
When controlling the duty ratio of PWM, φ value is stored in advance in correction data module by anti-espionage according to the rule of D=λ ^2.2
The φ value that property calculates, reaches correction purpose.
By above it is known that control PWM duty cycle D, exactly controls C1 and C2.When PWM cycle determination, that is, C1+C2
Total value it is fixed when, in LED glimmer, it is small that single-chip microcontroller gives C1 numerical value;In the biggish region of LED light flux, C1 numerical value is big.
Different model LED characteristic will be different, and show that human eye linearly experiences the duty ratio of corresponding unit time according to experiment, these
Data are stored in single-chip microcontroller, change C1 and C2 according to these data.
What has been described above is only a preferred embodiment of the present invention, it is noted that for those of ordinary skill in the art
For, without departing from the concept of the premise of the invention, various modifications and improvements can be made, these belong to the present invention
Protection scope.
Claims (4)
1. the gamma correction system that a kind of LED luminance is adjusted, which is characterized in that including single-chip microcontroller, light intensity sensor, correction
Data memory module, transformation from serial to parallel chip and LED light, the output end of the light intensity sensor and the input terminal electricity of single-chip microcontroller
For acquiring ambient light intensity, the correction data module is built in single-chip microcontroller, is stored in the correction data module for connection
There is the corresponding human eye of different LED light linearly to experience the data of the duty ratio of corresponding unit time, the control port of the single-chip microcontroller
It is electrically connected with the input terminal of transformation from serial to parallel chip, the output end of the transformation from serial to parallel chip is connected with LED light, the monolithic
Machine is used to that the data output in corresponding correction data module to be passed through transformation from serial to parallel core according to the intensity size of acquisition environment light
Piece adjusts LED light.
2. the gamma correction system that LED luminance according to claim 1 is adjusted, which is characterized in that described serial turn simultaneously
Row chip is an ICN2026 integrated chip and the multiple ICN2026 integrated chips being sequentially connected electrically, the ICN2026 collection
It is electrically connected respectively with LED light at the OUT0-OUT15 pin of chip, the OUT1_IN2 pin of a upper ICN2026 integrated chip
It is electrically connected with the SIN mouth of next ICN2026 integrated chip.
3. the non-linear correction method that a kind of LED luminance is adjusted, which comprises the following steps:
S1, show that the corresponding human eye of every kind of LED light linearly experiences the duty ratio of corresponding unit time according to experiment, by above-mentioned number
According in the correction data module for being stored in single-chip microcontroller memory；
S2, light intensity sensor incude the intensity of environment light and send single-chip microcontroller to；
S3, single-chip microcontroller are according to the intensity size of acquisition environment light by the data output in corresponding correction data module by serially turning
The C1 and C2 of parallel chip adjustment LED light, C1 and C2 meet following formula:
C1=d/(100*f*A*X)；
C2=(1/f-d/(100*f))/(A*X)
Wherein, d is the duty ratio of LED light, and f is the PWM frequency of LED light, and A is microcontroller serial port transmission speed, and X is to control
LED light number, C1 be transformation from serial to parallel chip need it is continuous issue the number that data bit is 1, C2 is transformation from serial to parallel core
Piece needs the continuous number for issuing data bit and being 0.
4. the non-linear correction method that LED luminance according to claim 3 is adjusted, which is characterized in that in the step S3
C1 and C2 calculating specifically includes the following steps:
For transformation from serial to parallel chip for each byte data to be sequentially output one by one, each byte is 8 positions, then this
Data can control eight LED by 0 and 1 change；
When microcontroller serial port transmission speed is A, transmission speed B=(8*A) of a byte；
If desired the number of the LED light controlled is X, then the byte number for needing to transmit is that Y=(X/8) is a；
In this way it can be concluded that the minimum time of transmission X LED light data of control is t=B*Y, i.e. t=A*X；
When it is 1 that the data for controlling LED light, which correspond to position, LED light is bright；When corresponding position is 0, LED goes out；
It needs to control the light on and off of LED light by changing the LED light turn-off time, that is, needs to change the PWM of control LED light；
By above it can be concluded that control LED light light on and off variation, that is, 0 and 1 variation the most fast time be t；
If the PWM frequency of LED light is f, the period of PWM is T=1/f, and the LED light bright time is then T1=T* (d/100), is gone out
Time is T2=T-T1；
It can be concluded that the bright number that single-chip microcontroller needs to issue data expression LED present bit in a PWM cycle is C1=T1/
t;The number to go out is C2=T2/t；
It to be so f, duty ratio d to the PWM frequency of LED, then it is 1 that transformation from serial to parallel chip, which needs the continuous data bit that issues,
Number C1=d/ (100*f*A*X)；It is C2=(1/f-d/ that transformation from serial to parallel chip, which needs the number that continuous sending data bit is 0,
(100*f))/(A*X)；
When output light flux changes linearly over time, the impression of human eye be not but it is linear, in LED glimmer area, lamps and lanterns very little
Luminous flux change also allows human eye to feel light intensity variation very greatly, and in the biggish region of light flux ratio, very big luminous flux jump, people
The light intensity variation that eye is felt is also little；
And human eye is to impression=luminous flux ^ (1/2.2) of brightness；
Impression of the human eye to brightness is indicated with F, and φ indicates luminous flux, F=φ ^ (1/2.2)；Wherein, φ ∝ D, D are PWM adjusting
The duty ratio of signal；
Linear brightness impression is by the φ for needing nonlinear change, due to φ and D Strict linear, therefore the brightness impression of linear change by
Need to defer to the φ of the nonlinear change of certain rule, this rule is exactly the corresponding nonlinear change φ of linear regulation, also
It is the anti-nonlinear characteristic that human eye brightness impression is received；
When controlling the duty ratio of PWM, φ value is stored in advance in correction data module by anti-espionage according to the rule of D=λ ^2.2
The φ value that property calculates, reaches correction purpose.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114340076A (en) * | 2021-07-15 | 2022-04-12 | 南京工业大学 | Control method and system of rhythm atmosphere lamp based on analog sound source sampling |
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Address after: 214000 Liyuan Development Zone, Binhu District, Wuxi City, Jiangsu Province, 04-6 Block (100 Dicui Road), 9 buildings and 2 floors Applicant after: ZHONGKEXIN INTEGRATED CIRCUIT Co.,Ltd. Address before: 214000 Liyuan Development Zone, Binhu District, Wuxi City, Jiangsu Province, 04-6 Block (100 Dicui Road), 9 buildings and 2 floors Applicant before: CHINA KEY SYSTEM & INTEGRATED CIRCUIT Co.,Ltd. |
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Application publication date: 20190423 |
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| RJ01 | Rejection of invention patent application after publication |