CN105609057A - Method for preventing high temperature liquefaction of LCD screen - Google Patents
Method for preventing high temperature liquefaction of LCD screen Download PDFInfo
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- CN105609057A CN105609057A CN201511022208.4A CN201511022208A CN105609057A CN 105609057 A CN105609057 A CN 105609057A CN 201511022208 A CN201511022208 A CN 201511022208A CN 105609057 A CN105609057 A CN 105609057A
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- temperature
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- crystal display
- lcd liquid
- temperature threshold
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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
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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)
- Liquid Crystal Display Device Control (AREA)
- Liquid Crystal (AREA)
Abstract
The present invention discloses a method for preventing the high temperature liquefaction of an LCD screen. The method comprises the steps of (1) allowing the temperatures between a first temperature threshold value and a second temperature threshold value to be corresponding to brightness coefficients one to one, wherein the brightness coefficients are gradually decreased with the rise of the temperature, (2) sampling the actual temperature of the LCD screen, and converting real temperature analog amount into a digital amount, (3) carrying out the following judgment that: allowing the LCD screen to display with maximum luminance in the condition that the actual temperature is smaller than or equal to the first temperature threshold value, or allowing the LCD screen to display in a luminance value which is the product of multiplying the luminance coefficient corresponding to the actual temperature and the maximum luminance in the condition that the actual temperature is larger than the first temperature threshold value or ir smaller than the second temperature threshold value, or allowing the LCD screen to display with minimum luminance in the condition that the actual temperature is larger than or equal to the second temperature threshold value. According to the method, the problems of LED liquefaction and abnormal display of a display caused by overhigh temperature are solved.
Description
Technical field
The field that the present invention relates to the use under the military environment of LCD liquid crystal display, particularly, relates to and preventingThe method of LCD liquid crystal display High-temperature Liquefaction.
Background technology
At present, in various information display system, FPD is current military first-selected system. AndIn FPD, show it is again most important selection. In all kinds of display systems, liquid crystal display has occupied 90%Above share. But it is a kind of passive demonstration that liquid crystal (LCD) shows, itself can not be luminous. Due toThe special construction of liquid crystal display, not luminous as the liquid crystal panel (screen) itself that shows information source,The characteristic that changes local transmission and reflection under electric field controls, need to add back lighting device, and liquid crystal displayCan there is bright image to show.
Liquid crystal is a kind of presenting in certain temperature range to be both different from solid-state, liquidly, is different from again gaseous stateParticular matter. It had both had the birefringence that anisotropic crystal has, and had again the stream of liquidMoving property. What in demonstration field, use is thermotropic liquid crystal, exceeds certain temperature range, and thermotropic liquid crystal is not justPresenting liquid crystal state. Liquid crystal is very responsive to temperature, and temperature can affect the refractive index of liquid crystal, thereby makesColor occurs abnormal. Temperature is low, occurs crystalline polamer, temperature height will be that liquid crystal liquefaction becomes liquidBody. And Military Flat Panel Displays employing at present is that liquid crystal (LCD) screen adds backlight composition. Military Flat Panel DisplaysParticular surroundings requirement, need to be at highlighted (1000cd/m2) or above and 60 DEG C of high temperature are even higherEnvironment under work, under hot environment, be all backlight illumination to be arranged to maximum carry out degradation. Now asThe larger heat radiation of fruit backlight power consumption is insufficient, will make heat accumulation accumulation pass to liquid crystal display. Liquid crystal is dividedSon is operated in outside the temperature range of regulation. There is liquefaction phenomenon in liquid crystal display, display can not normally show.
Summary of the invention
A kind of method that the object of this invention is to provide the LCD of preventing liquid crystal display High-temperature Liquefaction, this preventsThe method of LCD liquid crystal display High-temperature Liquefaction reaches reduction by automatically reduce backlight illumination under hot environmentThereby the object of temperature has solved aforementioned display device because excess Temperature causes liquid crystal display liquefaction, shows abnormalProblem.
To achieve these goals, the invention provides a kind of side of the LCD of preventing liquid crystal display High-temperature LiquefactionMethod, the method comprises:
Step 1, by the corresponding brightness coefficient one by one of the temperature between the first temperature threshold and the second temperature threshold,And along with the rising of described temperature, described luminance factor reduces gradually, the first temperature threshold correspondence is greatly brightDegree, the corresponding minimum brightness of the second temperature threshold;
Step 2, the actual temperature of sampling LCD liquid crystal display, is converted into digital quantity by actual temperature analog quantity;
Step 3, transmits digital quantity, and carries out following judgement:
In the situation that described actual temperature is less than or equal to the first temperature threshold, by LCD liquid crystal display withGreatly brightness shows; Or
In the situation that described actual temperature is greater than the first temperature threshold or is less than the second temperature threshold, willThe brightness value that LCD liquid crystal display is multiplied by very big brightness with luminance factor corresponding to actual temperature shows; Or
In the situation that described actual temperature is more than or equal to the second temperature threshold, by LCD liquid crystal display withMinimum brightness shows.
Preferably, in step 3, be greater than the first temperature threshold or be less than the second temperature in described actual temperatureIn the situation of degree threshold value, by the intrinsic brilliance of LCD liquid crystal display according to the variation order of luminance factor graduallyBeing adjusted to the brightness value that luminance factor corresponding to actual temperature be multiplied by very big brightness shows.
Preferably, in step 2, by the actual temperature of temperature sensor sampling LCD liquid crystal display.
Preferably, receive the analog quantity of the actual temperature of temperature sensor sampling by single-chip microcomputer, and by instituteState analog quantity and convert digital quantity to.
Preferably, in step 3, export drive circuit to by the pwm signal of single-chip microcomputer, controlThe brightness of backlight, and by the method for dutycycle is set, corresponding to the luminance factor setting in advance.
Preferably, described the first temperature threshold is 60 DEG C; Described the second temperature threshold is 70 DEG C.
Preferably, by the temperature value of the integer between 60 DEG C to 70 DEG C corresponding luminance factor successively respectivelyFor: 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, be 1-3s the interval time that digital quantity is judged.
By above-mentioned embodiment, thereby the present invention can change the back of the body by the brightness that changes backlightLight cavity temperature, reduces the temperature of liquid crystal display, avoids liquid crystal display at high temperature to liquefy, and has ensured liquid crystalThe object that display module at high temperature normally shows.
Other features and advantages of the present invention are described in detail the detailed description of the invention part subsequently.
Brief description of the drawings
Accompanying drawing is to be used to provide a further understanding of the present invention, and forms a part for description, withDetailed description of the invention one is below used from explanation the present invention, but is not construed as limiting the invention. ?In accompanying drawing:
Fig. 1 is the circuit connection diagram of explanation a kind of backlight cavities temperature sampling circuit of the present invention.
Detailed description of the invention
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is elaborated. Should be understood that,Detailed description of the invention described herein only, for description and interpretation the present invention, is not limited to thisBright.
A kind of method that the invention provides the LCD of preventing liquid crystal display High-temperature Liquefaction, the method comprises:
Step 1, by the corresponding brightness coefficient one by one of the temperature between the first temperature threshold and the second temperature threshold,And along with the rising of described temperature, described luminance factor reduces gradually, the first temperature threshold correspondence is greatly brightDegree, the corresponding minimum brightness of the second temperature threshold;
Step 2, the actual temperature of sampling LCD liquid crystal display, is converted into digital quantity by actual temperature analog quantity;
Step 3, transmits digital quantity, and carries out following judgement:
In the situation that described actual temperature is less than or equal to the first temperature threshold, by LCD liquid crystal display withGreatly brightness shows; Or
In the situation that described actual temperature is greater than the first temperature threshold or is less than the second temperature threshold, willThe brightness value that LCD liquid crystal display is multiplied by very big brightness with luminance factor corresponding to actual temperature shows; Or
In the situation that described actual temperature is more than or equal to the second temperature threshold, by LCD liquid crystal display withMinimum brightness shows.
The method of what the present invention was designed prevent High-temperature Liquefaction is simple, good stability, reliability are high. The partyMethod only need to increase software algorithm and temperature sensor sampling circuit just can be realized, and cost is low, by addingHigh temperature limits bright method to make LCD MODULE, and in the long term high temperature course of work, temperature can be not too high, avoidsLiquefaction phenomenon. Improved the competition of product at same interline, do not increased the complexity of technique, application originallyInvent the LCD MODULE of producing, obtain user's consistent favorable comment, increased user's potential orderNeed, known through experiment test, the method is easy to operate, and operating characteristic is good.
By above-mentioned mode, adopt PT100 temperature sensor to be placed on backlight luminous board, by backlightLamp plate PCB cabling and plug-in unit are connected to sample circuit, and the voltage sensor of sample circuit output sendsCarry out AD conversion to single-chip microcomputer. Single-chip microcomputer is monitored constantly to cavity temperature backlight. When single-chip microcomputer prisonWhile controlling to backlight cavities excess Temperature, carry out brightness of backlight to limit; By software, duty is setThe method of ratio limits, and under hot conditions, brightness is limited, and temperature is higher, and backlight can reachThe brightness of arriving is less. But display effect is exerted an influence when preventing that brightness is too small, lower limit brightnessFor the half of high-high brightness.
High temperature is limit bright judgement: (1) is less than 60 DEG C when temperature, does not carry out brightness limit; (2) for preventingHigh temperature is limit in bright process and is occurred adopting flicker backlight when judging that can not be less than 1 second interval time for twice; LimitRatio processed can not suddenly change, and requires gradual change: increasing or decreasing; In the time that temperature is between 60 DEG C to 70 DEG C,At each temperature, a corresponding different restriction luminance factor, is respectively 100,99,97,94,90,85,79,72,64,55,50. Directly brightness value is restricted to peaked half if temperature is higher.
In software, limit pattern high-high brightness * restriction in the value=daytime luminance factor of brightness; The concrete letter of implementingNumber is:
In the time that temperature is greater than 75 DEG C, the required frequency * of restriction luminance frequency pattern high-high brightness in value=daytime50%. High-high brightness after conversion exports drive circuit to by SCM PWM, control backlightBrightness. In the time that software detection arrives excess Temperature, when being greater than limit rate, current ratio carries out limit rateReduce. Successively decrease step by step reducing in process to adopt. When being less than limit rate, current ratio limitsRatio processed increases. In increase process, adopt and increase progressively step by step.
In a kind of detailed description of the invention of the present invention, in step 3, be greater than in described actual temperatureOne temperature threshold or be less than in the situation of the second temperature threshold, by the intrinsic brilliance of LCD liquid crystal display according toThe variation order of luminance factor is adjusted to gradually luminance factor corresponding to actual temperature and is multiplied by very big brightnessBrightness value shows.
It is excessive that the brightness of successively decreasing gradually or the luminance factor increasing progressively gradually can prevent that brightness from changing, and gives and usePerson's eyes impact, and prevent user's the eyes damage too fast because brightness changes.
In a kind of detailed description of the invention of the present invention, in step 2, pass through temperature sensor samplingThe actual temperature of LCD liquid crystal display. Temperature sensor sampling LCD liquid crystal display can be realized actual temperatureGather and process.
In this kind of embodiment, receive the simulation of the actual temperature of temperature sensor sampling by single-chip microcomputerAmount, and convert described analog quantity to digital quantity. The transmission of conveniently carrying out signal by such mode withControl transmission.
In a kind of detailed description of the invention of the present invention, in step 3, by the PWM letter of single-chip microcomputerNumber export drive circuit to, control the brightness of backlight, and by the method for dutycycle is set, corresponding toThe luminance factor setting in advance. By above-mentioned mode, can realize the change of luminance factor, by accounting forThe mode of empty ratio can realize the adjusting of brightness of backlight.
In a kind of detailed description of the invention of the present invention, described the first temperature threshold is 60 DEG C; Described secondTemperature threshold is 70 DEG C. By above-mentioned mode, can obtain concrete temperature threshold and change.
In a kind of detailed description of the invention of the present invention, by the temperature value of the integer between 60 DEG C to 70 DEG C1,0.99,0.97,0.94,0.90,0.85,079,0.72 corresponding luminance factor is successively respectively:,0.64,0.55 and 0.50.
In a kind of detailed description of the invention of the present invention, in step 3, between digital quantity is judgedInterval is 1-3s. Realize judgement successively second every 1-3, limit rate can not suddenly change, and requires gradual change,Can be conveniently for the protection of user's eyes.
In the most preferred embodiment of one of the present invention, the voltage of sampling is transported to single-chip microcomputer, profitWith the sensor on backlight, the temperature of backlight is monitored constantly, gathered, by the analog electrical gatheringPressure amount is sent to single-chip microcomputer and utilizes the AD converter of single-chip microcomputer inside to be transferred to digital quantity. When temperature backlightWhen degree reaches certain limit, change the output of the dutycycle of high-high brightness by software, when single-chip microcomputer prisonMeasure temperature backlight and reach 65 while spending, software starts to arrange dutycycle output under high-high brightness. Work as temperatureWhile spending to 70, backlight illumination maximum duty cycle is set to the half of theoretical value and exports control. ?Between 60 DEG C to 70 DEG C, successively decrease and control output. Object is the brightness that changes backlight, because liquidThe backlight illumination of brilliant display module reduces along with the increase of temperature backlight; Thereby change temperature in backlight cavitiesDegree, reduces the temperature of liquid crystal display, avoids liquid crystal display at high temperature to liquefy, and has ensured LCD MODULEThe at high temperature normal object showing.
Below describe by reference to the accompanying drawings the preferred embodiment of the present invention in detail, still, the present invention does not limitDetail in above-mentioned embodiment, within the scope of technical conceive of the present invention, can be to the present inventionTechnical scheme carry out multiple simple variant, these simple variant all belong to protection scope of the present invention.
It should be noted that in addition each the concrete technology spy described in above-mentioned detailed description of the inventionLevy, in reconcilable situation, can combine by any suitable mode, for fear of needn'tThe repetition of wanting, the present invention is to the explanation no longer separately of various possible combinations.
In addition, between various embodiment of the present invention, also can be combined, as long as itsWithout prejudice to thought of the present invention, it should be considered as content disclosed in this invention equally.
Claims (8)
1. a method that prevents LCD liquid crystal display High-temperature Liquefaction, is characterized in that, the method comprises:
Step 1, by the corresponding brightness coefficient one by one of the temperature between the first temperature threshold and the second temperature threshold,And along with the rising of described temperature, described luminance factor reduces gradually, the first temperature threshold correspondence is greatly brightDegree, the corresponding minimum brightness of the second temperature threshold;
Step 2, the actual temperature of sampling LCD liquid crystal display, is converted into digital quantity by actual temperature analog quantity;
Step 3, transmits digital quantity, and carries out following judgement:
In the situation that described actual temperature is less than or equal to the first temperature threshold, by LCD liquid crystal display withGreatly brightness shows; Or
In the situation that described actual temperature is greater than the first temperature threshold or is less than the second temperature threshold, willThe brightness value that LCD liquid crystal display is multiplied by very big brightness with luminance factor corresponding to actual temperature shows; Or
In the situation that described actual temperature is more than or equal to the second temperature threshold, by LCD liquid crystal display withMinimum brightness shows.
2. the method that prevents LCD liquid crystal display High-temperature Liquefaction according to claim 1, its feature existsIn, in step 3, be greater than the first temperature threshold or be less than the second temperature threshold in described actual temperatureIn situation, the intrinsic brilliance of LCD liquid crystal display is adjusted to reality gradually according to the variation order of luminance factorThe brightness value that luminance factor corresponding to border temperature is multiplied by very big brightness shows.
3. the method that prevents LCD liquid crystal display High-temperature Liquefaction according to claim 1, its feature existsIn, in step 2, by the actual temperature of temperature sensor sampling LCD liquid crystal display.
4. the method that prevents LCD liquid crystal display High-temperature Liquefaction according to claim 3, its feature existsIn, receive the analog quantity of the actual temperature of temperature sensor sampling by single-chip microcomputer, and by described analog quantityConvert digital quantity to.
5. the method that prevents LCD liquid crystal display High-temperature Liquefaction according to claim 1, its feature existsIn, in step 3, export drive circuit to by the pwm signal of single-chip microcomputer, control backlightBrightness, and by the method for dutycycle is set, corresponding to the luminance factor setting in advance.
6. the method that prevents LCD liquid crystal display High-temperature Liquefaction according to claim 1, its feature existsIn, described the first temperature threshold is 60 DEG C; Described the second temperature threshold is 70 DEG C.
7. the method that prevents LCD liquid crystal display High-temperature Liquefaction according to claim 2, its feature existsIn, by the temperature value of the integer between 60 DEG C to 70 DEG C respectively successively corresponding luminance factor be: 1,0.99,0.97,0.94,0.90,0.85,079,0.72,0.64,0.55 and 0.50.
8. the method that prevents LCD liquid crystal display High-temperature Liquefaction according to claim 1, its feature existsIn, in step 3, be 1-3s the interval time that digital quantity is judged.
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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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| 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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Cited By (2)
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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 |
| US11715402B2 (en) | 2021-04-13 | 2023-08-01 | Asustek Computer Inc. | Electronic device with display panel and control method for updating brightness limit of display panel based on temperature |
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| CN105609057B (en) | 2019-03-15 |
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