CN105609057B - The method for preventing LCD liquid crystal display High-temperature Liquefaction - Google Patents
The method for preventing LCD liquid crystal display High-temperature Liquefaction Download PDFInfo
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- CN105609057B CN105609057B CN201511022208.4A CN201511022208A CN105609057B CN 105609057 B CN105609057 B CN 105609057B CN 201511022208 A CN201511022208 A CN 201511022208A CN 105609057 B CN105609057 B CN 105609057B
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- temperature
- liquid crystal
- crystal display
- lcd liquid
- 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
- G09G3/34—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 by control of light from an independent source
- G09G3/3406—Control of illumination source
- G09G3/3413—Details of control of colour illumination sources
Abstract
The present invention discloses the method for preventing LCD liquid crystal display High-temperature Liquefaction, this method comprises: 1, temperature between first temperature threshold and second temperature threshold value is corresponded into luminance factor, and as the temperature rises, luminance factor gradually decreases 2, the actual temperature for sampling LCD liquid crystal display, converts digital quantity for actual temperature analog quantity；3, it carries out following judgement: in the case where actual temperature is less than or equal to the first temperature threshold, LCD liquid crystal display being shown with very big brightness；Or in the case where actual temperature is greater than the first temperature threshold or is less than second temperature threshold value, LCD liquid crystal display is shown with the corresponding luminance factor of actual temperature multiplied by the brightness value of very big brightness；Or in the case where actual temperature is greater than or equal to second temperature threshold value, LCD liquid crystal display is shown with minimum brightness.This method solve aforementioned display devices to cause liquid crystal display to liquefy because temperature is excessively high, shows abnormal problem.
Description
Technical field
The present invention relates to the fields used under LCD liquid crystal display military environment, and in particular, to prevents LCD liquid crystal display high
The liquefied method of temperature.
Background technique
Currently, FPD is current military preferred system in various information display system.And in FPD
Display is again most important selection.Liquid crystal display occupies 90% or more share in all kinds of display systems.But liquid crystal (LCD)
Display is that one kind is passively shown, itself cannot shine.Due to the special construction of liquid crystal display, as display information source
Liquid crystal display panel (screen) itself does not shine, and changes the characteristic of local transmission and reflection under electric field controls, needs to add back lighting device, liquid
Crystal display just can have bright image to show.
Liquid crystal is that a kind of present in certain temperature range is not only different from solid-state, liquid, but also is different from gaseous special object
Matter.It had not only had birefringence possessed by anisotropic crystal, but also the mobility with liquid.It uses in the field of display
Be thermotropic liquid crystal, exceed certain temperature range, thermotropic liquid crystal just not present liquid crystal state.Liquid crystal is very sensitive to temperature,
Temperature will affect the refractive index of liquid crystal, so that color be made to be abnormal.Temperature is low, crystalline polamer occurs, and temperature is high will
It is that liquid crystal liquefaction becomes liquid.And Military Flat Panel Displays are using liquid crystal (LCD) screen plus backlight composition at present.Military Flat Panel Displays
Particular surroundings requirement, need to work at highlighted (1000cd/m2) or above and 60 DEG C of even higher environment of high temperature, height
It is all that backlight illumination is arranged to maximum progress degradation under warm environment.At this time if the larger heat dissipation of backlight power consumption is insufficient,
Heat accumulation accumulation will be made to be transmitted to liquid crystal display.Make liquid crystal molecule work except defined temperature range.There is liquid in liquid crystal display
Change phenomenon, display cannot normally be shown.
Summary of the invention
The object of the present invention is to provide a kind of methods for preventing LCD liquid crystal display High-temperature Liquefaction, this prevents LCD liquid crystal display high temperature
Liquefied method achievees the purpose that reduce temperature to solve above-mentioned show by reducing backlight illumination automatically under high temperature environment
Show that device causes liquid crystal display to liquefy because temperature is excessively high, shows abnormal problem.
To achieve the goals above, the present invention provides a kind of method for preventing LCD liquid crystal display High-temperature Liquefaction, this method packets
It includes:
Step 1, the temperature between the first temperature threshold and second temperature threshold value is corresponded into luminance factor, and with institute
The raising of temperature is stated, the luminance factor gradually decreases, and the first temperature threshold corresponds to very big brightness, and second temperature threshold value corresponds to pole
Small brightness；
Step 2, the actual temperature for sampling LCD liquid crystal display, converts digital quantity for actual temperature analog quantity；
Step 3, digital quantity is transmitted, and carries out following judgement:
The actual temperature be less than or equal to the first temperature threshold in the case where, by LCD liquid crystal display with very big brightness into
Row display；Or
In the case where the actual temperature is greater than the first temperature threshold or is less than second temperature threshold value, by LCD liquid crystal display
It is shown with the corresponding luminance factor of actual temperature multiplied by the brightness value of very big brightness；Or
The actual temperature be greater than or equal to second temperature threshold value in the case where, by LCD liquid crystal display with minimum brightness into
Row display.
Preferably, in step 3, in the actual temperature greater than the first temperature threshold or less than the feelings of second temperature threshold value
Under condition, the intrinsic brilliance of LCD liquid crystal display is gradually adjusted into brightness corresponding to actual temperature according to the variation sequence of luminance factor
Coefficient is shown multiplied by the brightness value of very big brightness.
Preferably, in step 2, pass through the actual temperature of temperature sensor sampling LCD liquid crystal display.
Preferably, the analog quantity of the actual temperature of temperature sensor sampling is received by single-chip microcontroller, and by the analog quantity
It is converted into digital quantity.
Preferably, in step 3, it is exported by the pwm signal of single-chip microcontroller to driving circuit, controls the brightness of backlight,
And by the method for setting duty ratio, correspond to pre-set luminance factor.
Preferably, first temperature threshold is 60 DEG C；The second temperature threshold value is 70 DEG C.
Preferably, the luminance factor temperature value of the integer between 60 DEG C to 70 DEG C being corresponding in turn to are as follows: 1,0.99,
0.97,0.94,0.90,0.85,079,0.72,0.64,0.55 and 0.50.
Preferably, in step 3, the interval time judged to digital quantity is 1-3s.
By above-mentioned embodiment, the present invention can be changed warm in backlight cavities by changing the brightness of backlight
Degree, reduces the temperature of liquid crystal display, liquid crystal display is avoided to liquefy at high temperature, ensure that LCD MODULE is normally shown at high temperature
The purpose shown.
Other features and advantages of the present invention will the following detailed description will be given in the detailed implementation section.
Detailed description of the invention
The drawings are intended to provide a further understanding of the invention, and constitutes part of specification, with following tool
Body embodiment is used to explain the present invention together, but is not construed as limiting the invention.In the accompanying drawings:
Fig. 1 is the circuit connection diagram for illustrating a kind of backlight cavities temperature sampling circuit of the invention.
Specific embodiment
Below in conjunction with attached drawing, detailed description of the preferred embodiments.It should be understood that this place is retouched
The specific embodiment stated is merely to illustrate and explain the present invention, and is not intended to restrict the invention.
The present invention provides a kind of method for preventing LCD liquid crystal display High-temperature Liquefaction, this method comprises:
Step 1, the temperature between the first temperature threshold and second temperature threshold value is corresponded into luminance factor, and with institute
The raising of temperature is stated, the luminance factor gradually decreases, and the first temperature threshold corresponds to very big brightness, and second temperature threshold value corresponds to pole
Small brightness；
Step 2, the actual temperature for sampling LCD liquid crystal display, converts digital quantity for actual temperature analog quantity；
Step 3, digital quantity is transmitted, and carries out following judgement:
The actual temperature be less than or equal to the first temperature threshold in the case where, by LCD liquid crystal display with very big brightness into
Row display；Or
In the case where the actual temperature is greater than the first temperature threshold or is less than second temperature threshold value, by LCD liquid crystal display
It is shown with the corresponding luminance factor of actual temperature multiplied by the brightness value of very big brightness；Or
The actual temperature be greater than or equal to second temperature threshold value in the case where, by LCD liquid crystal display with minimum brightness into
Row display.
Prevent that the method for High-temperature Liquefaction is simple, stability is good, high reliablity designed by the present invention.This method only needs to increase
Software algorithm and temperature sensor sampling circuit is added to can be achieved with, at low cost, limiting bright method by addition high temperature makes liquid crystal
Show module, temperature is not too high in the long term high temperature course of work, avoids liquefaction phenomenon.It is competing among colleague to improve product
It strives, does not increase the complexity of technique, using present invention LCD MODULE produced, obtain the consistent favorable comment of user, increase
The potential order needs for having added user, through experiment test it is found that this method is easy to operate, working characteristics is good.
It by above-mentioned mode, is placed on backlight luminous board using PT100 temperature sensor, is walked by backlight luminous board PCB
Line and plug-in unit are connected to sample circuit, and the voltage sensor of sample circuit output is sent to single-chip microcontroller and is AD converted.Monolithic
Machine constantly monitors backlight cavity temperature.When microcomputer monitoring to backlight cavities is then carried out to brightness of backlight when the temperature is excessively high
It is limited；It is limited, brightness is limited under the high temperature conditions, temperature is got over by the method that duty ratio is arranged in software
Height, the attainable brightness of backlight are smaller.But display effect is had an impact when brightness is too small in order to prevent, minimum limitation brightness
For the half of maximum brightness.
High temperature limits bright judgement: (1) when temperature is less than 60 DEG C, without brightness limitation；It (2) is to prevent from limiting bright process in high temperature
In there is backlight flicker, using ought judge that interval time cannot be less than 1 second twice；Limit rate cannot be mutated, it is desirable that gradual change: be passed
Increase or successively decreases；When temperature is between 60 DEG C to 70 DEG C, a corresponding different limitation luminance factor at each temperature, respectively
100,99,97,94,90,85,79,72,64,55,50.If the higher half that brightness value is directly restricted to maximum value of temperature.
Value=daytime mode maximum brightness * for limiting brightness in software limits luminance factor；Function is embodied are as follows:
When temperature is greater than 75 DEG C, frequency * 50% needed for limiting luminance frequency value=daytime mode maximum brightness.After conversion
Maximum brightness exported by SCM PWM to driving circuit, control the brightness of backlight.When software detection is excessively high to temperature
When, current radio then carries out limit rate when being greater than limit rate and is reduced.It uses during reduction and successively decreases step by step.Currently
Ratio then carries out limit rate when being less than limit rate and is increased.It uses during increase and is incremented by step by step.
In a kind of specific embodiment of the invention, in step 3, it is greater than the first temperature threshold in the actual temperature
Or in the case where being less than second temperature threshold value, the intrinsic brilliance of LCD liquid crystal display is gradually adjusted according to the variation sequence of luminance factor
It is whole to be shown to the corresponding luminance factor of actual temperature multiplied by the brightness value of very big brightness.
The brightness or gradually incremental luminance factor gradually successively decreased can prevent brightness change excessive, to the eyes of user
It impacts, prevents the damage that the eyes of user are too fast due to brightness change.
In a kind of specific embodiment of the invention, in step 2, pass through temperature sensor sampling LCD liquid crystal display
Actual temperature.The acquisition and processing of actual temperature may be implemented in temperature sensor sampling LCD liquid crystal display.
In this embodiment, the analog quantity of the actual temperature of temperature sensor sampling is received by single-chip microcontroller, and will
The analog quantity is converted into digital quantity.The transmitting for carrying out signal and control is facilitated to transmit in this way.
In a kind of specific embodiment of the invention, in step 3, exported by the pwm signal of single-chip microcontroller to driving
Circuit controls the brightness of backlight, and by the method for setting duty ratio, corresponds to pre-set luminance factor.By upper
The mode stated, may be implemented the change of luminance factor, and the adjusting of brightness of backlight may be implemented by way of duty ratio.
In a kind of specific embodiment of the invention, first temperature threshold is 60 DEG C；The second temperature threshold value
It is 70 DEG C.By above-mentioned mode, available specific temperature threshold changes.
It is in a kind of specific embodiment of the invention, the temperature value of the integer between 60 DEG C to 70 DEG C is successively right respectively
The luminance factor answered are as follows: 1,0.99,0.97,0.94,0.90,0.85,079,0.72,0.64,0.55 and 0.50.
In a kind of specific embodiment of the invention, in step 3, the interval time judged to digital quantity is 1-
3s.It realized every 1-3 seconds and successively judges, limit rate cannot be mutated, it is desirable that gradual change can be convenient the guarantor for user's eyes
Shield.
In a kind of most preferred embodiment of the invention, the voltage of sampling is transported to single-chip microcontroller, utilizes backlight
On sensor the temperature of backlight is constantly monitored, acquire, the analog voltage amount of acquisition is sent to single-chip microcontroller and is utilized
Converter inside single-chip microcontroller is switched to digital quantity.When backlight temperature reaches a certain range, changed most by software
The output of the duty ratio of big brightness, when single-chip microcontroller monitors that backlight temperature reaches 65 degree, software is started setting up under maximum brightness
Duty ratio output.When temperature is to 70 degree, the half that backlight illumination maximum duty cycle is set as theoretical value is subjected to output control.
Control output of successively decreasing is being carried out between 60 DEG C to 70 DEG C.Purpose is the brightness of change backlight, because LCD MODULE
Backlight illumination reduces with the increase of backlight temperature；To change backlight cavity temperature, the temperature of liquid crystal display is reduced, is kept away
Exempt from liquid crystal display to liquefy at high temperature, ensure that the purpose that LCD MODULE is normally shown at high temperature.
It is described the prefered embodiments of the present invention in detail above in conjunction with attached drawing, still, the present invention is not limited to above-mentioned realities
The detail in mode is applied, within the scope of the technical concept of the present invention, a variety of letters can be carried out to technical solution of the present invention
Monotropic type, these simple variants all belong to the scope of protection of the present invention.
It is further to note that specific technical features described in the above specific embodiments, in not lance
In the case where shield, can be combined in any appropriate way, in order to avoid unnecessary repetition, the present invention to it is various can
No further explanation will be given for the combination of energy.
In addition, various embodiments of the present invention can be combined randomly, as long as it is without prejudice to originally
The thought of invention, it should also be regarded as the disclosure of the present invention.
Claims (6)
1. a kind of method for preventing LCD liquid crystal display High-temperature Liquefaction, which is characterized in that this method comprises:
Step 1, the temperature between the first temperature threshold and second temperature threshold value is corresponded into luminance factor, and with the temperature
The raising of degree, the luminance factor gradually decrease, and the first temperature threshold corresponds to very big brightness, and second temperature threshold value corresponds to minimum bright
Degree；
Step 2, the actual temperature for sampling LCD liquid crystal display, converts digital quantity for actual temperature analog quantity；
Step 3, digital quantity is transmitted, and carries out following judgement:
In the case where the actual temperature is less than or equal to the first temperature threshold, LCD liquid crystal display is shown with very big brightness
Show；Or
In the case where the actual temperature is greater than the first temperature threshold or is less than second temperature threshold value, by LCD liquid crystal display with reality
Temperature corresponding luminance factor in border is shown multiplied by the brightness value of very big brightness；Or
In the case where the actual temperature is greater than or equal to second temperature threshold value, LCD liquid crystal display is shown with minimum brightness
Show；
In step 3, in the case where the actual temperature is greater than the first temperature threshold or is less than second temperature threshold value, by LCD
The intrinsic brilliance of liquid crystal display is gradually adjusted to the corresponding luminance factor of actual temperature according to the variation sequence of luminance factor multiplied by pole
The brightness value of big brightness is shown；
The luminance factor that the temperature value of integer between 60 DEG C to 70 DEG C is corresponding in turn to are as follows: 1,0.99,0.97,0.94,
0.90,0.85,079,0.72,0.64,0.55 and 0.50.
2. the method according to claim 1 for preventing LCD liquid crystal display High-temperature Liquefaction, which is characterized in that in step 2, lead to
The actual temperature of excess temperature sensor sample LCD liquid crystal display.
3. the method according to claim 2 for preventing LCD liquid crystal display High-temperature Liquefaction, which is characterized in that connect by single-chip microcontroller
The analog quantity of the actual temperature of shrinkage temperature sensor sample, and the analog quantity is converted into digital quantity.
4. the method according to claim 1 for preventing LCD liquid crystal display High-temperature Liquefaction, which is characterized in that in step 3, lead to
The pwm signal for crossing single-chip microcontroller is exported to driving circuit, controls the brightness of backlight, and by the method for setting duty ratio, corresponding
In pre-set luminance factor.
5. the method according to claim 1 for preventing LCD liquid crystal display High-temperature Liquefaction, which is characterized in that first temperature
Threshold value is 60 DEG C；The second temperature threshold value is 70 DEG C.
6. the method according to claim 1 for preventing LCD liquid crystal display High-temperature Liquefaction, which is characterized in that in step 3, right
The interval time that digital quantity is judged is 1-3s.
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| CN201511022208.4A CN105609057B (en) | 2015-12-30 | 2015-12-30 | The method for preventing LCD liquid crystal display High-temperature Liquefaction |
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| CN112233624A (en) * | 2020-10-16 | 2021-01-15 | 上海华东汽车信息技术有限公司 | Backlight processing method, medium and device for instrument panel and vehicle |
| TWI774319B (en) | 2021-04-13 | 2022-08-11 | 華碩電腦股份有限公司 | Electronic device and display panel control method thereof |
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| KR20060084571A (en) * | 2005-01-20 | 2006-07-25 | 삼성전자주식회사 | Driving apparatus for led back light and lcd monitor having the same |
| JP4761869B2 (en) * | 2005-07-28 | 2011-08-31 | 東芝モバイルディスプレイ株式会社 | Liquid crystal display device and liquid crystal display method |
| JP2007148095A (en) * | 2005-11-29 | 2007-06-14 | Sharp Corp | Liquid crystal display device |
| KR20070079455A (en) * | 2006-02-02 | 2007-08-07 | 삼성전자주식회사 | Back-light unit having a plurality of luminous element and control method thereof |
| CN101505559A (en) * | 2008-02-04 | 2009-08-12 | 光联科技股份有限公司 | Temperature control system for backlight module |
| CN101819341B (en) * | 2009-02-26 | 2012-02-01 | 佛山市顺德区汉达精密电子科技有限公司 | Liquid-crystal display with overheat protection function and protection method thereof |
| CN101609657B (en) * | 2009-07-23 | 2011-12-28 | 三一重工股份有限公司 | Method and device for controlling backlight of liquid crystal display |
| CN102568387A (en) * | 2010-12-29 | 2012-07-11 | 广东中显科技有限公司 | Liquid crystal backlight driving system |
| CN102968961B (en) * | 2012-11-15 | 2015-04-08 | 京东方科技集团股份有限公司 | Control method, backlight control circuit, liquid crystal display (LCD) panel and LCD |
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