CN106128370A - The temperature protective device of vehicle-mounted TFT panel type display and method - Google Patents
The temperature protective device of vehicle-mounted TFT panel type display and method Download PDFInfo
- Publication number
- CN106128370A CN106128370A CN201610788354.6A CN201610788354A CN106128370A CN 106128370 A CN106128370 A CN 106128370A CN 201610788354 A CN201610788354 A CN 201610788354A CN 106128370 A CN106128370 A CN 106128370A
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- Prior art keywords
- temperature
- type display
- panel type
- resistance
- vehicle
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Classifications
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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 invention discloses a kind of temperature protective device and the method for vehicle-mounted TFT panel type display, protection device includes peripheral circuit, MCU processing module, bias light control circuit and background light unit；Described peripheral circuit has temperature sensor, and described peripheral circuit is connected to the input of MCU processing module, the outfan of described MCU processing module connects bias light control circuit, described bias light control circuit reconnects described background light unit.The present invention can detect the temperature of TFT panel type display and regulate background light level according to temperature so that the work of TFT panel type display is unlikely to damage at a normal temperature.
Description
Technical field
The present invention relates to automobile instrument display field, particularly relate to the temperature protective device of a kind of vehicle-mounted TFT panel type display
And method.
Background technology
TFT panel type display is widely used in automobile instrument, as the important interface of man-machine interaction, be used for showing figure or
Word message, facilitates driver to understand the state of current car faster, thus improves the safety of driving；But at bad environments
In the case of, do not have the TFT panel type display of temperature protection strategy often to cause permanent infringement because internal temperature is too high, to car
Master tape carrys out certain economic loss.
Summary of the invention
The technical problem to be solved in the present invention is to provide the temperature protective device of a kind of vehicle-mounted TFT panel type display, to overcome
Temperature is too high causes permanent lesion owing to not having temperature protection strategy to cause for the vehicle-mounted TFT panel type display that prior art exists.
The present invention is to solve above-mentioned technical problem by following technical proposals:
A kind of protection device of vehicle-mounted TFT panel type display, it is characterised in that: include peripheral circuit, MCU processing module, the back of the body
Scape light control circuit and background light unit；Described peripheral circuit has temperature sensor, and described peripheral circuit is connected at MCU
The reason input of module, the outfan of described MCU processing module connect bias light control circuit, described bias light control circuit again
Connect described background light unit.
Described temperature sensor is positioned at the lamp box of described vehicle-mounted TFT panel type display.
Described temperature sensor is critesistor, and described peripheral circuit is by divider resistance and the series connection of described critesistor
Becoming, the common port of described divider resistance and described critesistor connects the input of described MCU processing module；Described divider resistance
The other end connects reference power source, the other end ground connection of described critesistor.
Described bias light control circuit includes audion, the first resistance, the second resistance and the 3rd resistance；Described first resistance
One end connect described MCU processing module outfan, one end of described second resistance and one end of described audion connect jointly
Ground, the other end of described first resistance and the other end of described second resistance connect the base stage of described three grades of light jointly, and described three
The colelctor electrode of pole pipe connects described background light unit through described 3rd resistance.
Described background light unit is made up of light emitting diode, and the negative pole of described light emitting diode connects described 3rd resistance,
Positive pole connects power supply.
It addition, the present invention also provides for the temperature protecting method of the temperature protective device of a kind of vehicle-mounted TFT panel type display, it is special
Levy and be:
MCU processing module detects the temperature of current vehicle-mounted TFT panel type display by critesistor, and according to the car detected
Carry the temperature of TFT panel type display, according to predetermined brightness regulation scheme, the brightness of vehicle-mounted TFT panel type display is adjusted, defeated
Go out brightness regulated signal；
Described brightness regulation scheme is:
Current Temperatures numerical value is 100% less than DT1, TFT background light level regulated value；
Current Temperatures numerical value is less than or equal to DT3, TFT background light level regulated value according to slope variation more than or equal to DT1；
Current Temperatures numerical value is closed less than or equal to HT, TFT bias light more than DT3；
Current Temperatures numerical value is arranged to 10% more than HT, TFT background light level regulated value；
Current Temperatures numerical value changes to low temperature from high temperature, if temperature is more than DT1, TFT background light level less than or equal to DT2
Regulated value is according to slope variation；
Wherein, DT1 is to confirm that TFT keeps performance normal maximum temperature threshold value by hot test, and DT3 is that instrument is normal
The maximum temperature threshold value of work, DT2 is the magnetic hysteresis value of temperature DT3, and DT4 is the temperature threshold that instrument at high temperature performance begins to decline
Value, HT is the maximum temperature threshold value that temperature resistance is corresponding.
Described brightness regulated signal is duty cycle control signal.
Use technique scheme, use the most progressive effect of the present invention to be: described device can detect in TFT screen
The variations in temperature in portion thus regulate the brightness of TFT display, make TFT screen work in normal temperature range, thus reach to prevent car
Carry the effect that TFT panel type display is impaired because of high temperature.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of the protection device of invention；
Fig. 2 is that the critesistor of the present invention arranges position view；
Fig. 3 is the schematic diagram of the brightness regulation scheme of the present invention.
Detailed description of the invention
Name preferred embodiment, and combine accompanying drawing and become apparent from intactly illustrating the present invention.
As it is shown in figure 1, the temperature protective device of the vehicle-mounted TFT panel type display of the present invention, at peripheral circuit 100, MCU
Reason module 200, bias light control circuit 300 and background light unit.Peripheral circuit 100 has temperature sensor.Bias light
Unit is made up of light emitting diode 401.
As in figure 2 it is shown, TFT screen 510 is positioned at the oral area of the lamp box 500 of vehicle-mounted TFT panel type display, light emitting diode 401
In the inner bottom surface of lamp box 500, temperature sensor 101 is also disposed at lamp box inner bottom surface and is positioned at light emitting diode 401 side.
Again as it is shown in figure 1, peripheral circuit 100 is in series by divider resistance R2 and critesistor R1, divider resistance R2 and
The common port of critesistor R1 connects the input of MCU processing module 200；The other end of divider resistance R2 connects reference power source,
The other end ground connection of critesistor R1.
Bias light control circuit 300 includes audion BG1, the first resistance R3, the second resistance R4 and the 3rd resistance R5；First
One end of resistance R3 connects the outfan of MCU processing module 200, and one end of the second resistance R4 and one end of audion BG1 are common
Ground connection, the other end of the first resistance R3 and the other end of the second resistance R4 connect the base stage of three grades of light BG1, audion BG1 jointly
Colelctor electrode connect power supply through the negative pole of the 3rd resistance R5 connecting luminous diode 401, the positive pole of light emitting diode 401.
When the protection device of the present invention is run, owing to critesistor R1 and divider resistance R2 constitutes a bleeder circuit, outward
Enclosing the circuit output voltage i.e. dividing potential drop of critesistor R1, the logical MCU processing module of giving of output voltage processes, due to critesistor R1
Resistance can be calculated by its dividing potential drop, and the resistance of critesistor R1 changes along with the change of temperature, and the two
Between there is linear relationship (as shown in the table), can carry out calculating with fitting function thus obtain Current Temperatures, according to temperature
Different given different brightness regulation values also export bias light control circuit with duty cycle signals form, and bias light control circuit will
The voltage and current of duty cycle signals is amplified thus is driven background light unit to reach to control the purpose of brightness.
| Temperature DEG C | Resistance K Ω | Temperature DEG C | Resistance K Ω |
| -40 | 195.652 | 45 | 4.917 |
| -35 | 148.171 | 50 | 4.161 |
| -30 | 113.347 | 55 | 3.535 |
| -25 | 87.559 | 60 | 3.014 |
| -20 | 68.237 | 65 | 2.586 |
| -15 | 53.650 | 70 | 2.228 |
| -10 | 42.506 | 75 | 1.925 |
| -5 | 33.892 | 80 | 1.669 |
| 0 | 27.219 | 85 | 1.452 |
| 5 | 22.021 | 90 | 1.268 |
| 10 | 17.926 | 95 | 1.110 |
| 15 | 14.674 | 100 | 0.974 |
| 20 | 12.081 | 105 | 0.858 |
| 25 | 10.000 | 110 | 0.758 |
| 30 | 8.315 | 115 | 0.672 |
| 35 | 6.948 | 120 | 0.596 |
| 40 | 5.834 | 125 | 0.531 |
As it is shown on figure 3, the temperature protecting method of the temperature protective device of the vehicle-mounted TFT panel type display of the present invention is: at MCU
Reason module detects the temperature of current vehicle-mounted TFT panel type display by critesistor, and according to the vehicle-mounted TFT panel type display detected
Temperature, according to predetermined brightness regulation scheme output duty cycle signal, the brightness of vehicle-mounted TFT panel type display is adjusted.Tool
The regulation scheme of body is:
Current Temperatures numerical value is 100% less than DT1, TFT background light level regulated value；
Current Temperatures numerical value is less than or equal to DT3, TFT background light level regulated value according to slope variation more than or equal to DT1；
Current Temperatures numerical value is closed less than or equal to HT, TFT bias light more than DT3；
Current Temperatures numerical value is arranged to 10% more than HT, TFT background light level regulated value；
Current Temperatures numerical value changes to low temperature from high temperature, if temperature is more than DT1, TFT background light level less than or equal to DT2
Regulated value is according to slope variation；
Wherein, DT1 is to confirm that TFT keeps performance normal maximum temperature threshold value by hot test, TFT supplier lead to
Crossing high temperature experiment to determine, DT3 is the maximum temperature value that instrument normally works, and DT2 is the magnetic hysteresis threshold value of temperature DT3, and DT4 is instrument
The temperature threshold that at high temperature performance begins to decline, HT is the maximum temperature threshold value that temperature resistance is corresponding.
Prevent TFT display screen worked by foregoing detailed description under the high temperature conditions it can be seen that the present invention has
The advantage that journey causes permanent lesion because internal temperature is too high.
Although the foregoing describing the detailed description of the invention of the present invention, it will be appreciated by those of skill in the art that this is only
Being to illustrate, protection scope of the present invention is defined by the appended claims.Those skilled in the art without departing substantially from
On the premise of the principle of the present invention and essence, these embodiments can be made various changes or modifications, but these changes and
Amendment each falls within protection scope of the present invention.
Claims (7)
1. the protection device of a vehicle-mounted TFT panel type display, it is characterised in that: include peripheral circuit, MCU processing module, background
Light control circuit and background light unit；Described peripheral circuit has temperature sensor, and described peripheral circuit is connected to MCU process
The input of module, the outfan connection bias light control circuit of described MCU processing module, described bias light control circuit connect again
Connect described background light unit.
The protection device of vehicle-mounted TFT panel type display the most according to claim 1, it is characterised in that: described temperature sensor is positioned at
In the lamp box of described vehicle-mounted TFT panel type display.
3. according to the protection device of the vehicle-mounted TFT panel type display of claim 1 or 2, it is characterised in that: described temperature sensor is
Critesistor, described peripheral circuit is in series by divider resistance and described critesistor, described divider resistance and described temperature-sensitive
The common port of resistance connects the input of described MCU processing module；The other end of described divider resistance connects reference power source, described heat
The other end ground connection of quick resistance.
4. according to the protection device of the vehicle-mounted TFT panel type display of claim 1 or 2, it is characterised in that: described bias light controls electricity
Road includes audion, the first resistance, the second resistance and the 3rd resistance；One end of described first resistance connects described MCU and processes mould
The outfan of block, one end of described second resistance and one end common ground of described audion, the other end of described first resistance
With the base stage that the other end of described second resistance connects described three grades of light jointly, the colelctor electrode of described audion is through described 3rd electricity
Resistance connects described background light unit.
The protection device of vehicle-mounted TFT panel type display the most according to claim 4, it is characterised in that: described background light unit
Being made up of light emitting diode, the negative pole of described light emitting diode connects described 3rd resistance, and positive pole connects power supply.
6. the temperature protecting method of the temperature protective device of a vehicle-mounted TFT panel type display, it is characterised in that:
MCU processing module detects the temperature of current vehicle-mounted TFT panel type display by critesistor, and vehicle-mounted according to detect
The temperature of TFT panel type display, is adjusted the brightness of vehicle-mounted TFT panel type display according to predetermined brightness regulation scheme, output
Brightness regulated signal；
Described brightness regulation scheme is:
Current Temperatures numerical value is 100% less than DT1, TFT background light level regulated value；
Current Temperatures numerical value is less than or equal to DT3, TFT background light level regulated value according to slope variation more than or equal to DT1；
Current Temperatures numerical value is closed less than or equal to HT, TFT bias light more than DT3；
Current Temperatures numerical value is arranged to 10% more than HT, TFT background light level regulated value；
Current Temperatures numerical value changes to low temperature from high temperature, if temperature regulates more than DT1, TFT background light level less than or equal to DT2
Value is according to slope variation；
Wherein, DT1 is to confirm that TFT keeps performance normal maximum temperature threshold value by hot test, and DT3 is that instrument normally works
Maximum temperature threshold value, DT2 is the magnetic hysteresis value of temperature DT3, and DT4 is the temperature threshold that instrument at high temperature performance begins to decline,
HT is the maximum temperature threshold value that temperature resistance is corresponding.
The temperature protecting method of the temperature protective device of vehicle-mounted TFT panel type display the most according to claim 6, its feature exists
In: described brightness regulated signal is duty cycle control signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610788354.6A CN106128370A (en) | 2016-08-31 | 2016-08-31 | The temperature protective device of vehicle-mounted TFT panel type display and method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610788354.6A CN106128370A (en) | 2016-08-31 | 2016-08-31 | The temperature protective device of vehicle-mounted TFT panel type display and method |
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| CN106128370A true CN106128370A (en) | 2016-11-16 |
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| CN201610788354.6A Pending CN106128370A (en) | 2016-08-31 | 2016-08-31 | The temperature protective device of vehicle-mounted TFT panel type display and method |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111913512A (en) * | 2019-05-09 | 2020-11-10 | 上海博泰悦臻电子设备制造有限公司 | Overheat protection method and device for vehicle-mounted terminal |
| CN112181017A (en) * | 2020-09-17 | 2021-01-05 | 武汉海微科技有限公司 | Temperature protection algorithm based on vehicle-mounted display screen |
| 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 |
| CN115268544A (en) * | 2022-07-20 | 2022-11-01 | 武汉海微科技有限公司 | Bias power supply circuit of OLED display screen for automobile |
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| CN115268544A (en) * | 2022-07-20 | 2022-11-01 | 武汉海微科技有限公司 | Bias power supply circuit of OLED display screen for automobile |
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Application publication date: 20161116 |
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