CN102436786A - Drive method and device of automobile display screen - Google Patents
Drive method and device of automobile display screen Download PDFInfo
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- CN102436786A CN102436786A CN2011104269579A CN201110426957A CN102436786A CN 102436786 A CN102436786 A CN 102436786A CN 2011104269579 A CN2011104269579 A CN 2011104269579A CN 201110426957 A CN201110426957 A CN 201110426957A CN 102436786 A CN102436786 A CN 102436786A
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Abstract
The invention relates to a drive method of an automobile display screen, and the method comprises the following steps of: obtaining the temperature value at the position of a display device; judging a temperature range in which the obtained temperature value is positioned; adjusting a drive parameter output to a display screen in the display device according to the temperature range; and outputting the drive parameter to the display screen. The invention also relates to a drive device of the automobile display screen. By utilizing the drive method and device of the automobile display screen provided by the invention, the display effect of an LCD (liquid crystal display) is relatively good even in the case of relatively large temperature span.
Description
Technical field
The present invention relates to vehicle electric field, more particularly, relate to a kind of driving method and device of automobile display screen.
Background technology
Along with the fast development of technology, the auto industry of China comprises that the development of automotive electronics and automobile multifunctional STN LCD dot matrix display screen system product is quite swift and violent, the widespread use on automobile of various electronic products.And as the automobile multifunctional STN LCD dot matrix display screen system product of automobile electronics, the first-selection of the instrument multifunction display device of multifunctional and multipurpose on the automobile especially.For existing automobile LCD display, because the intrinsic characteristic of liquid crystal material, when high temperature (for example, temperature is approaching+80 ℃ time) environment, the trend of gaseous state can appear in material wherein, and at this moment, the LCD display display message just has unnecessary conditions of streaking; And when low temperature (for example, temperature approaching-30 ℃ time) environment, solid-state trend can appear in material wherein, causes liquid crystal concentration not enough, change slowly, and the information that LCD display shows, character is thin out smudgy.Display effect is not good enough.And the span of the residing variation of ambient temperature of automobile is bigger, and this causes two kinds of above-mentioned situation to appear on the same automobile LCD display at different time, makes the display effect variation.
Summary of the invention
The technical matters that the present invention will solve is, to the defective of prior art above-mentioned display effect variation when temperature span is big, provide a kind of when temperature span is big the display effect driving method and the device of automobile display screen preferably.
The technical solution adopted for the present invention to solve the technical problems is: construct a kind of driving method of automobile display screen, comprise the steps:
A) obtain the ambient temperature value of said display device position;
B) judge the said residing temperature range of ambient temperature value that obtains;
C), regulate the driving parameters that outputs to display screen in the said display device according to said temperature range;
D) the said driving parameters of output is to said display screen.
In the driving method of automobile display screen of the present invention, said steps A) further comprises the steps: in
A1) obtain the magnitude of voltage that temperature sensing unit is exported;
A2) obtain its corresponding ambient temperature value through tabling look-up according to the said magnitude of voltage of obtaining.
In the driving method of automobile display screen of the present invention, said step B) further comprise:
B1) one by one with said obtain ambient temperature value and a plurality of prior divisions, respectively represent a temperature range a pair of end points the end points temperature value relatively; Judge that the said temperature value of obtaining is whether in the middle of a pair of end points temperature value; Carry out next step in this way; Otherwise, compare with following pair of end point temperature value;
B2) confirm that said environment temperature is in the temperature range of pair of end point value representation.
In the driving method of automobile display screen of the present invention, said step C) further comprising in tables look-up obtain prior storage, the corresponding display driver parameter value of this temperature range.
In the driving method of automobile display screen of the present invention, said parameter value comprises contrast driving voltage value and the drive signal frame rate that outputs to display screen.
In the driving method of automobile display screen of the present invention, the contrast voltage and the driving frequency of said each temperature range have nothing in common with each other; The said temperature value of obtaining is high more, and its corresponding contrast voltage is low more; It is low more to drive frame rate.
In the driving method of automobile display screen of the present invention, said temperature range comprises that the temperature range with-30 ℃ to+80 ℃ is that an interval on average is divided into 23 temperature ranges with 5 ℃ in advance.
The invention still further relates to a kind of device of realizing above-mentioned automobile display panel drive method, comprising:
Temperature value is obtained the unit: the ambient temperature value that is used to obtain said display device position;
Temperature range judging unit: be used to judge the said residing temperature range of ambient temperature value that obtains;
Driving parameters obtains the unit: be used for according to said temperature range, regulate the driving parameters that outputs to display screen in the said display device;
Driving parameters transmission unit: be used to export said driving parameters to said display screen.
In device of the present invention, said temperature value is obtained the unit and is comprised:
Voltage is obtained module: the voltage change that is used to obtain temperature sensor;
Temperature value is obtained module: being used to table look-up obtains the corresponding ambient temperature value of said voltage change.
In device of the present invention, said temperature range judging unit comprises:
The temperature range comparison module: be used for one by one with said obtain ambient temperature value and a plurality of prior divisions, respectively represent a temperature range a pair of end points the end points temperature value relatively, judge that the said temperature value of obtaining is whether in the middle of a pair of end points temperature value;
Temperature range obtains module: be used for confirming that said temperature is in this temperature range that end points temperature value is represented.
The driving method and the device of the automobile display screen of embodiment of the present invention; Has following beneficial effect: owing to periodically obtain voltage with the temperature sensing circuit of variation of ambient temperature; And according to the variation of environment temperature and residing temperature range thereof and revise or compensate the driving parameters of LCD display; Comprise contrast voltage and frame rate, even make that the display effect of LCD is also better when temperature span is big.
Description of drawings
Fig. 1 is the driving method of automobile display screen of the present invention and installs method realization flow figure among the embodiment;
Fig. 2 is temperature range realization flow figure among the said embodiment;
Fig. 3 is an apparatus structure synoptic diagram among the said embodiment;
Fig. 4 is the structured flowchart of display system among the said embodiment;
Fig. 5 is the circuit diagram of display system microcontroller among the said embodiment;
Fig. 6 is the electrical schematic diagram of display system among the said embodiment.
Embodiment
To combine accompanying drawing that the embodiment of the invention is described further below.
As shown in Figure 1, in the driving method and device embodiment of automobile display screen of the present invention, its driving method of realizing the automobile display screen comprises the steps:
Step S11 obtains ambient temperature value: in this step, obtain the ambient temperature value of display screen environment of living in.Specific to present embodiment; Automobile multifunctional STN LCD dot matrix display screen comprises the MCU microprocessor, is used for the temperature sensing circuit that the real-time detection variation of ambient temperature is given said MCU microprocessor input monitoring information; The LCD LCDs circuit that is used to show said multifunctional information is (referring to Fig. 4, Fig. 5 and Fig. 6; Wherein, Fig. 4 is the structured flowchart of display system, and Fig. 5,6 is respectively its electrical schematic diagram).In above-mentioned display system; Processor is externally connected to provides the sensor that can real-time detect variation of ambient temperature (being thermistor RT1 in the present embodiment); When environment temperature under-30 ℃ to+80 ℃ different condition; Thermistor RT1 is under the different temperatures environment, and resistive impedance is by 898.5K Ω to 5.5K Ω change (standard value is 47K Ω).When constant voltage (in the present embodiment, with 3.3V voltage as standard), through resistance R 149 and thermistor RT1 dividing potential drop, behind capacitor C 113 filter shapes, the magnitude of voltage 3.22V to 0.66V that obtains changing is input to the PIN97 of said MCU microprocessor.Through said MCU microprocessor internal; Obtain the magnitude of voltage of input with the speed that reads 1 p.s.; Read continuously 3 times and the voltage value data that obtains is compared,, just can obtain the certain ambient temperature value of above-mentioned display system environment of living in if the result is the same; If the result is different, then continue to read and comparison, up to obtaining the same reading; The purpose that is provided with like this is to obtain stable ambient temperature value.Afterwards, through the corresponding temperature value of tabling look-up, obtain and export the parameter that is provided with by MCU, the driving circuit of control LCD display changes the duty of LCD under the different temperatures environment.
Step S12 judges current temperature value temperature range of living in: in this step, through the ambient temperature value that obtains in the above-mentioned steps, can obtain the residing temperature range of this temperature value.Through the temperature sensing circuit of real-time detection variation of ambient temperature, survey current which type of environment that is in of auto clock display screen system; For present embodiment, with the environment temperature that-30 ℃ to+80 ℃ automobiles possibly run into, be divided into 23 grades, every grade of 5 ℃ of temperature variation, every grade is a temperature range; In above-mentioned microprocessor, after obtaining the current environmental temperature value,, obtain the interval at this value place again through the processing of said microprocessor internal.Why dividing these temperature ranges, is in order accurately to control the display screen driving parameters of output, display screen all can comparatively stably to be worked under any temperature environment that possibly run on the one hand; On the one hand,, then may cause the bigger waste of resource in addition, bring the factor of more inconvenience to control if each temperature value is all exported different drive signals.In the present embodiment, the driving parameters of above-mentioned each temperature range possibly be identical, also possibly be different, and this will be determined on a case-by-case basis, and still, these driving parameters all are to set in advance and be stored in the above-mentioned microprocessor.
Step S13 takes out the interval corresponding driving parameters of said temperature: because above-mentioned steps has been learnt the environment temperature of current display system environment of living in, and the temperature range at this temperature value place, and the temperature range that each divides out; All corresponding one group of corresponding driving parameter, these driving parameters are stored in the above-mentioned microprocessor in advance, so; In this step; By above-mentioned ambient temperature value place temperature range, find this group driving parameters corresponding, and take out and to organize driving parameters with it.The interval pairing driving parameters of these different temperature possibly be identical, also possibly be different.In the present embodiment, above-mentioned driving parameters comprises contrast driving voltage value and the drive signal frame rate that outputs to display screen.In the present embodiment, also above-mentioned a plurality of temperature cycles are numbered, each temperature range all has a unique code or numbering expression; During above-mentioned driving parameters with the stored in form of form in above-mentioned microcontroller, obtaining is also to be to obtain with the mode of tabling look-up; And the numbering of above-mentioned each temperature range is exactly the index of this form.The contrast voltage of each temperature range has nothing in common with each other with the driving frame rate in the present embodiment; The ambient temperature value that obtains is high more, and its corresponding contrast voltage is low more; It is low more to drive frame rate; So the contrast voltage of the temperature range that it is corresponding is low more; It is low more to drive frame rate.In the present embodiment, after the above-mentioned driving parameters that obtains is tabled look-up and obtained, will be transported in the register of appointment and deposit, have register to be transported on the display screen; When not having new driving parameters to be removed, the driving parameters of display screen just is the parameter in these registers always; When carrying out next time relatively and obtaining new driving parameters, be transported to the register of these appointments equally, and cover the content in original register, so the driving parameters that is transported to display screen just becomes the parameter that these newly write register.
Step S14 exports above-mentioned driving parameters and arrives display screen: in this step, the above-mentioned driving parameters that obtains is transported on the display screen, keeps the operate as normal of display screen.In the present embodiment; Above-mentioned drive signal is the transmission through the communication data line of the PIN71～PIN81 of above-mentioned microprocessor; Send the PIN18～PIN30 of parameter to the LCDs circuit that changes; And the LCDs circuit changes VLCD (contrast) magnitude of voltage of the driving circuit of display screen, and N-LINE (frame rate) parameter, makes LCD display be operated in optimum condition.
In the present embodiment, above-mentioned steps is not only to carry out once, in the working time of display screen; Above-mentioned steps periodically repeats according to setting-up time; Constantly regulate the driving parameters that outputs to display screen,, can guarantee that also the demonstration of display screen is comparatively stable even bigger variation has taken place described so in the short period of time environment temperature according to residing environment temperature; Can not occur trailing or phenomenon that writing is thin out, this makes that the display effect of display screen is comparatively stable.Particularly, microprocessor all can repeat one time above-mentioned steps haply in per minute.
In said method, as shown in Figure 2, its method of confirming the temperature range that current environmental temperature belongs to is following:
Step S21 takes out the endpoint value of a pair of temperature range: in this step, take out the endpoint value that is stored in a pair of temperature range in the microprocessor in advance; In the present embodiment, as noted earlier, the temperature value that automobile possibly run into is divided into 23 temperature ranges, and each temperature range comprises the temperature difference of 5 degree, and the maximum temperature value and the minimum temperature value of each temperature range are stored as its endpoint value; In this step, the pair of end point value that comes to this of taking-up, normally first pair of endpoint value.
Does step S22 judge that Current Temperatures is in above-mentioned endpoint value? In this step, with the endpoint value of current environmental temperature value that obtains and above-mentioned taking-up relatively, judge it and whether within above-mentioned pair of end point value, in this way, carry out next step; Otherwise, jump to step S24; Specific to how comparatively speaking, in the present embodiment, be that this ambient temperature value that obtains is done comparison with above-mentioned pair of end point value respectively, if its greater than the minimum value in the above-mentioned pair of end point value less than its maximal value, then be judged as this to endpoint value in; Otherwise, be judged as in the no longer above-mentioned pair of end point value of this ambient temperature value.
Step S23 confirms Current Temperatures temperature range of living in: in this step; Because the ambient temperature value that obtains is in above-mentioned pair of end point value; So this environment temperature is exactly in this temperature range indicated to endpoint value, the temperature range at the ambient temperature value place of so just having confirmed to obtain.
Step S24 endpoint value is all relatively in this step; Because the ambient temperature value that obtains is not in the indicated temperature range of above-mentioned pair of end point value; Need whether to judge this ambient temperature value in another temperature range, so, need judge whether all mistakes relatively of all endpoint values (just whether all temperature range); In this way, execution in step S26; Otherwise execution in step S25.
Step S25 takes out following pair of end point value: in this step, take out following pair of end point value and jump to step S22;
Step S26 reports an error: in this step, because the ambient temperature value that obtains not in a plurality of temperature ranges of above-mentioned setting, then keeps the parameter of last MCU setting, do not change the parameter of register.So, not that temperature has exceeded setting range, mistake has appearred exactly, so report an error, remind the user to note.What deserves to be mentioned is that when reporting an error, above-mentioned display system still will continue to show.So, in this step, be not send driving parameters to above-mentioned display unit, but the parameter constant before keeping.
In the present invention; Also relate to a kind of device of realizing said method; In present embodiment, as shown in Figure 3, this apparatus structure comprises: temperature value is obtained unit 31, temperature range judging unit 32, driving parameters and is obtained unit 33 and driving parameters transmission unit 34.Wherein, temperature value is obtained the ambient temperature value that unit 31 is used to obtain said display device position; Temperature range judging unit 32 is used to judge the said residing temperature range of temperature value that obtains; Driving parameters obtains unit 33 and is used for according to said temperature range, regulates the driving parameters that outputs to display screen in the said display device; Driving parameters transmission unit 34 is used to export said driving parameters to said display screen.
In the present embodiment, temperature value is obtained voltage that unit 31 comprises the voltage change that is used to obtain temperature sensor and is obtained module 311 and obtain module 312 with the temperature value that obtains the corresponding temperature value of said voltage change that is used to table look-up.And temperature range judging unit 32 comprise be used for one by one with said obtain temperature value and a plurality of prior divisions, respectively represent a temperature range a pair of end points temperature value relatively, judge said obtain temperature value whether the temperature range comparison module 321 in the middle of the pair of end point value be used for the temperature range that definite said temperature is in this temperature range that endpoint value is represented and obtain module 322.In the present embodiment, said units and module are the software function module of realizing said method in the microprocessor.
The above embodiment has only expressed several kinds of embodiments of the present invention, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to claim of the present invention.Should be pointed out that for the person of ordinary skill of the art under the prerequisite that does not break away from the present invention's design, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection domain of patent of the present invention should be as the criterion with accompanying claims.
Claims (10)
1. the driving method of an automobile display screen is characterized in that, comprises the steps:
A) obtain the ambient temperature value of said display device position;
B) judge the said residing temperature range of ambient temperature value that obtains;
C), regulate the driving parameters that outputs to display screen in the said display device according to said temperature range;
D) the said driving parameters of output is to said display screen.
2. the driving method of automobile display screen according to claim 1 is characterized in that, said steps A) in further comprise the steps:
A1) obtain the magnitude of voltage that temperature sensing unit is exported;
A2) obtain its corresponding ambient temperature value through tabling look-up according to the said magnitude of voltage of obtaining.
3. the driving method of automobile display screen according to claim 2 is characterized in that, said step B) further comprise:
B1) one by one with said obtain temperature value and a plurality of prior divisions, respectively represent a temperature range a pair of end points the end points temperature value relatively; Judge that the said temperature value of obtaining is whether in the middle of the pair of end point value; Carry out next step in this way, otherwise, compare with following pair of end point temperature value;
B2) confirm that said temperature is in the temperature range that a pair of end points temperature value representes.
4. the driving method of automobile display screen according to claim 3 is characterized in that, said step C) in further comprise table look-up obtain prior storage, the corresponding display driver parameter value of this temperature range.
5. the driving method of automobile display screen according to claim 4 is characterized in that, said parameter value comprises contrast driving voltage value and the drive signal frame rate that outputs to display screen.
6. the driving method of automobile display screen according to claim 5 is characterized in that, the contrast voltage and the driving frequency of said each temperature range have nothing in common with each other; The said temperature value of obtaining is high more, and its corresponding contrast voltage is low more; It is low more to drive frame rate.
7. the driving method of automobile display screen according to claim 6 is characterized in that, said temperature range comprises that the temperature range with-30 ℃ to+80 ℃ is that an interval on average is divided into 23 temperature ranges with 5 ℃ in advance.
8. a device of realizing the driving method of automobile display screen as claimed in claim 1 is characterized in that, comprising:
Temperature value is obtained the unit: the ambient temperature value that is used to obtain said display device position;
Temperature range judging unit: be used to judge the said residing temperature range of ambient temperature value that obtains;
Driving parameters obtains the unit: be used for according to said temperature range, regulate the driving parameters that outputs to display screen in the said display device;
Driving parameters transmission unit: be used to export said driving parameters to said display screen.
9. device according to claim 8 is characterized in that, said temperature value is obtained the unit and comprised:
Voltage is obtained module: the voltage change that is used to obtain temperature sensor;
Temperature value is obtained module: being used to table look-up obtains the corresponding temperature value of said voltage change.
10. device according to claim 9 is characterized in that, said temperature range judging unit comprises:
The temperature range comparison module: be used for one by one with said obtain temperature value and a plurality of prior divisions, respectively represent a temperature range a pair of end points the end points temperature value relatively, judge that the said temperature value of obtaining is whether in the middle of the pair of end point value;
Temperature range obtains module: be used for confirming that said temperature is in this temperature range that end points temperature value is represented.
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| CN201110426957.9A CN102436786B (en) | 2011-12-19 | 2011-12-19 | Drive method and device of automobile display screen |
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| CN201110426957.9A CN102436786B (en) | 2011-12-19 | 2011-12-19 | Drive method and device of automobile display screen |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103713676A (en) * | 2012-09-28 | 2014-04-09 | 三星电子株式会社 | Method for controlling voltage based on temperature and terminal supporting the same |
| CN107016963A (en) * | 2017-04-20 | 2017-08-04 | 京东方科技集团股份有限公司 | The driving method of electroluminescence display panel, its drive device and display device |
| WO2022032507A1 (en) * | 2020-08-12 | 2022-02-17 | 海能达通信股份有限公司 | Liquid crystal screen frame rate control method and apparatus, and liquid crystal screen display system |
| CN114077072A (en) * | 2020-08-12 | 2022-02-22 | 海能达通信股份有限公司 | Frame frequency control method and device of liquid crystal screen and liquid crystal screen display system |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103713676A (en) * | 2012-09-28 | 2014-04-09 | 三星电子株式会社 | Method for controlling voltage based on temperature and terminal supporting the same |
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| CN114077072A (en) * | 2020-08-12 | 2022-02-22 | 海能达通信股份有限公司 | Frame frequency control method and device of liquid crystal screen and liquid crystal screen display system |
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| CN102436786B (en) | 2014-07-09 |
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