CN103605873A - Method for guaranteeing stability of color coordinates of night vision modules in low-temperature environment - Google Patents
Method for guaranteeing stability of color coordinates of night vision modules in low-temperature environment Download PDFInfo
- Publication number
- CN103605873A CN103605873A CN201310648357.6A CN201310648357A CN103605873A CN 103605873 A CN103605873 A CN 103605873A CN 201310648357 A CN201310648357 A CN 201310648357A CN 103605873 A CN103605873 A CN 103605873A
- Authority
- CN
- China
- Prior art keywords
- temperature
- pulse width
- pulsewidth
- night vision
- color coordinates
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Landscapes
- Radiation Pyrometers (AREA)
Abstract
The invention discloses a method for guaranteeing stability of color coordinates of night vision modules in a low-temperature environment. A pulse width correction curve is set, and pulse width values are set on temperature points of the correction curve so that the color coordinates of the temperature points can be 0.179+/-0.005; the pulse width values are set on the three temperature points of +60 DEG C, +25 DEG C, -45 DEG C, rough fitting is carried out according to the three sets of data to generate a pulse width correction function y=a*e*b*x+c, and accordingly a dynamic index pulse width correction curve table is generated; the temperatures of backlight sensors on the night vision modules are read, when the temperatures range from -45 DEG C to +60 DEG C, the pulse width correction curve table is inquired, the pulse width correction value corresponding to the current temperature is obtained, and a pulse width value obtained currently is loaded to a register to output a waveform. The method is simple and practical, hardware and optical portions do not need to be modified, all the vision modules can be optimized when software is modified, dynamic fitting is carried out after specific points of various modules are found out, the color coordinates are stable and universality is high.
Description
Technical field
The present invention relates to a kind of brightness control method, in particular a kind of low temperature environment guarantees the method for night vision module stable color coordinate.
Background technology
Night viewing compatible module night pattern for meeting chromaticity coordinates requirement, need to close white lamp, only open redgreenblue lamp.So directly continuing to use traditional software, to process chromaticity coordinates be at normal temperatures no problem, yet the relation of tri coloured lantern light intensity and temperature as shown in Figure 1.As can be seen from Figure, along with reducing of temperature, relatively bluish-green lamp, it is very large that the light intensity of red light promotes amplitude, when the light intensity of-40 ℃ of red lights is 25 ℃ more than 1.7 times, and 1.1 times of left and right when now the light intensity of bluish-green lamp is only 25 ℃.At low temperatures, due to the characteristic of red light luminescent material, phase BELAND lamp and green light, there is obviously drift in red light predominant wavelength, and red light luminescence efficiency significantly strengthens.Because red light gain is maximum, chromaticity coordinates u ' obviously increases.Same reason, at high temperature, red light luminescence efficiency significantly weakens, and chromaticity coordinates u ' obviously reduces.Tradition brilliance control algorithm is that the pwm value that calculates gained is loaded into corresponding registers, and this pwm value is made as a fixed value after debugging, temperature independent, the chromaticity coordinates drift that the red light predominant wavelength drift that this method cannot modifying factor temperature causes causes.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, a kind of method that provides low temperature environment to guarantee night vision module stable color coordinate, the chromaticity coordinates drift that the red light predominant wavelength drift that modifying factor temperature causes causes.
The present invention is achieved by the following technical solutions, the present invention includes following steps:
(1) pulsewidth fair curve is set, described fair curve, for pwm value to be set at each temperature spot, makes the chromaticity coordinates value of each temperature spot remain on 0.179 ± 0.005 with this;
(2) under+60 ℃ ,+25 ℃ ,-45 ℃ three temperature spots, carry out the setting of pwm value, take these three groups of data as generating pulsewidth correction function y=ae according to approximate matching
bx+ c, thus dynamic index pulsewidth fair curve table generated, and wherein, a and c are real number; B is the real number in (0 ,+∞) interval;
(3) read the temperature of sensor backlight in night vision module, when temperature is between-45 ℃～+ 60 ℃, inquiry pulsewidth fair curve table, obtains the pulsewidth modified value that Current Temperatures is corresponding, and the pwm value of current gained is loaded into register output waveform.
The temperature range of the temperature spot of described step (1) is-45～+ 60 ℃.
The present invention has the following advantages compared to existing technology: the present invention is simple and practical, needn't change hardware and opticator, revises software and can optimize all night vision module, first finds out specified point carry out performance matching, stable color coordinate, highly versatile again for various modules.
Accompanying drawing explanation
Fig. 1 is the curve map of prior art tri coloured lantern light intensity and temperature;
Fig. 2 is red light pulsewidth compensated curve of the present invention;
Fig. 3 is process flow diagram of the present invention.
Embodiment
Below embodiments of the invention are elaborated, the present embodiment is implemented take technical solution of the present invention under prerequisite, provided detailed embodiment and concrete operating process, but protection scope of the present invention is not limited to following embodiment.
In the present embodiment, the chromaticity coordinates u ' of module requires to remain on 0.179 ± 0.005, adopts the chromaticity coordinates parameter of CS2000 optical parameter measuring instrument measurement module each temperature spot in a high low-temperature circulating in test.For Rule Summary obtains red light pulsewidth compensation meter.At each temperature spot, pwm value is manually set, with this, makes the chromaticity coordinates value of each temperature spot remain on 0.179 ± 0.005.The pwm value record that each temperature spot is set, the pwm value during with 25 ℃ of normal temperature compares, and draws matched curve as shown in Figure 2, the pulsewidth M during with 25 ℃ of normal temperature
t (25 ℃)compare, in the time of-45 ℃, pwm value is made as 0.75M
t (25 ℃), in the time of 60 ℃, pwm value is made as 1.3M
t (25 ℃).
The pulsewidth modified value of each temperature spot fits to the index curve shown in Fig. 2 can guarantee that chromaticity coordinates u ' is stabilized in 0.179 ± 0.005.
Concrete implementation step is as shown in Figure 3:
(1) pulsewidth fair curve is set, described fair curve, for pwm value to be set at each temperature spot, makes the chromaticity coordinates value of each temperature spot remain on 0.179 ± 0.005 with this;
(2) under+60 ℃ ,+25 ℃ ,-45 ℃ three temperature spots, carry out the setting of pwm value, take these three groups of data as generating pulsewidth correction function y=ae according to approximate matching
bx+ c, thus dynamic index pulsewidth fair curve table generated, a, b, c are matching acquired results, wherein a is real number, for the proportional zoom of correction function; B is the real number in (0 ,+∞) interval, for the amplification of correction function; C is real number, for the intersection point of correction function and y axle.Three number synergy, change and carry out corresponding pulsewidth correction for accurate tracking chromaticity coordinates;
(3) read the temperature of sensor backlight in night vision module, when temperature is between-45 ℃～+ 60 ℃, inquiry pulsewidth fair curve table, obtains the pulsewidth modified value that Current Temperatures is corresponding, and the pwm value of current gained is loaded into register output waveform.
Due to the otherness of modules, this pulsewidth fair curve can not be applicable to all modules, but by test of many times, a plurality of modules measurements comprehensively learn that the pulsewidth fair curve of all modules all can fit to index curve and process.Therefore adopt the mode that automatically generates dynamic pulsewidth correction chart.Change the once color matching of traditional color matching method into three color matchings, at high low temperature, under normal temperature, all carry out the setting of pwm value, write in EEPROM, comprehensive these three pwm values simulate dynamic index pulsewidth fair curve table, before being loaded into register, pwm value tables look-up according to Current Temperatures, to be written into register through the revised pwm value of excess temperature, the mode that this performance matching calculates pulsewidth goes for all night vision module, has effectively revised the problem that drift occurs module chromaticity coordinates that varies with temperature.
Claims (2)
1. low temperature environment guarantees a method for night vision module stable color coordinate, it is characterized in that, comprises the following steps:
(1) pulsewidth fair curve is set, described fair curve, for pwm value to be set at each temperature spot, makes the chromaticity coordinates value of each temperature spot remain on 0.179 ± 0.005 with this;
(2) under+60 ℃ ,+25 ℃ ,-45 ℃ three temperature spots, carry out the setting of pwm value, take these three groups of data as generating pulsewidth correction function y=ae according to approximate matching
bx+ c, thus dynamic index pulsewidth fair curve table generated, and wherein, a and c are real number; B is the real number in (0 ,+∞) interval;
(3) read the temperature of sensor backlight in night vision module, when temperature is between-45 ℃～+ 60 ℃, inquiry pulsewidth fair curve table, obtains the pulsewidth modified value that Current Temperatures is corresponding, and the pwm value of current gained is loaded into register output waveform.
2. a kind of low temperature environment according to claim 1 guarantees the method for night vision module stable color coordinate, it is characterized in that, the temperature range of the temperature spot of described step (1) is-45～+ 60 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310648357.6A CN103605873A (en) | 2013-12-04 | 2013-12-04 | Method for guaranteeing stability of color coordinates of night vision modules in low-temperature environment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310648357.6A CN103605873A (en) | 2013-12-04 | 2013-12-04 | Method for guaranteeing stability of color coordinates of night vision modules in low-temperature environment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103605873A true CN103605873A (en) | 2014-02-26 |
Family
ID=50124094
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310648357.6A Pending CN103605873A (en) | 2013-12-04 | 2013-12-04 | Method for guaranteeing stability of color coordinates of night vision modules in low-temperature environment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103605873A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101325379A (en) * | 2007-06-15 | 2008-12-17 | 群康科技(深圳)有限公司 | Backlight control circuit and backlight control method |
| US20090179848A1 (en) * | 2008-01-10 | 2009-07-16 | Honeywell International, Inc. | Method and system for improving dimming performance in a field sequential color display device |
| CN201698714U (en) * | 2010-03-11 | 2011-01-05 | 彩虹集团公司 | Color correction device of direct-down type LED backlight source |
-
2013
- 2013-12-04 CN CN201310648357.6A patent/CN103605873A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101325379A (en) * | 2007-06-15 | 2008-12-17 | 群康科技(深圳)有限公司 | Backlight control circuit and backlight control method |
| US20090179848A1 (en) * | 2008-01-10 | 2009-07-16 | Honeywell International, Inc. | Method and system for improving dimming performance in a field sequential color display device |
| CN201698714U (en) * | 2010-03-11 | 2011-01-05 | 彩虹集团公司 | Color correction device of direct-down type LED backlight source |
Non-Patent Citations (2)
| Title |
|---|
| TEXAS INSTRUMENTS: "LP5520 RGB Backlight LED Driver", 《HTTP://WWW.TI.COM.CN/PRODUCT/CN/LP5520/TECHNICALDOCUMENTS》, 2 May 2013 (2013-05-02), pages 9 - 11 * |
| 马红星 等: "满足夜视兼容显示应用的三基色LED背光配色方法", 《液晶与显示》, vol. 28, no. 03, 15 June 2013 (2013-06-15), pages 373 - 376 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US10015859B2 (en) | Backlight source adjustment method, backlight source adjustment device, and display device | |
| CN105427788A (en) | Method and system for automatically adjusting brightness and chromaticity of display device | |
| CN109948184B (en) | Illumination mixed light calculation method and device, computer equipment and storage medium | |
| US8737731B2 (en) | Method and apparatus for correcting light | |
| RU2010149821A (en) | LIGHT MODULE, LIGHTING SYSTEM AND METHOD FOR INTEGRATING DATA INTO RADIATED LIGHT | |
| CN104298838A (en) | Target quantity adjusting method for light source and light source | |
| CN105136432A (en) | LED lighting quality evaluation method based on objective and subjective experiment data and system | |
| CN104269156B (en) | Brightness measurement value correction method, LED box bearing calibration and system | |
| CN104423913B (en) | Light measurement method of parameters, device and screen adjustment method, electronic equipment | |
| CN104457785A (en) | Dynamic LCOS (liquid crystal on silicon) spliced-type star simulator and ground calibrating device of star sensor | |
| CN110677954B (en) | Precise dimming method and system for super-three-color LED light source | |
| TW200924560A (en) | Method of calibrating a lighting system, and lighting system | |
| CN104517579A (en) | Debugging method of over-driving table | |
| CN105357804A (en) | Formation lamp LED light source full-life brightness precise control system and control method | |
| CN108495406A (en) | Mix light source color temperature adjusting method, system, storage medium and human-computer interaction terminal | |
| CN103517511A (en) | Semiconductor lighting apparatus | |
| Ohno | Optical metrology for LEDs and solid state lighting | |
| JP5984401B2 (en) | Image display apparatus, control method therefor, and image display system | |
| CN109979390A (en) | A kind of Gamma bearing calibration, equipment and system, medium | |
| CN103295485A (en) | Display method and system for LED display screen | |
| CN106531065B (en) | A kind of parallel regulating system of one-to-many gamma curve and method | |
| CN103109582A (en) | A relative flux sensor and a method of determining a ratio between maximum light intensities, a control device, a color tunable lamp, a luminaire and a computer program product | |
| CN104266757A (en) | Light source simulation method capable of automatically calibrating spectrum and continuously adjusting and device thereof | |
| CN103605873A (en) | Method for guaranteeing stability of color coordinates of night vision modules in low-temperature environment | |
| CN103531173B (en) | A kind of screen color method of adjustment and device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C53 | Correction of patent of invention or patent application | ||
| CB02 | Change of applicant information |
Address after: 241000 Huaxia science and Technology Park, hi tech Development Zone, Yijiang District, Wuhu, Anhui Applicant after: Avic Huadong Photoelectric Co., Ltd. Address before: 230001 Huaxia science and Technology Park, hi tech Development Zone, Yijiang District, Wuhu, Anhui Applicant before: Avic Huadong Photoelectric Co., Ltd. |
|
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20140226 |
|
| RJ01 | Rejection of invention patent application after publication |