CN106448604A - Display driving circuit, method for controlling same and liquid crystal display - Google Patents
Display driving circuit, method for controlling same and liquid crystal display Download PDFInfo
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- CN106448604A CN106448604A CN201611002859.1A CN201611002859A CN106448604A CN 106448604 A CN106448604 A CN 106448604A CN 201611002859 A CN201611002859 A CN 201611002859A CN 106448604 A CN106448604 A CN 106448604A
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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
- G09G3/36—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 using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3696—Generation of voltages supplied to electrode drivers
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- Crystallography & Structural Chemistry (AREA)
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Abstract
The invention discloses a display driving circuit, a method for controlling the same and a liquid crystal display. The display driving circuit comprises a temperature detection circuit, a time sequence control circuit and a pulse width modulation circuit. The temperature detection circuit is used for detecting current working environment temperatures of a display panel and outputting corresponding electric signals; the time sequence control circuit is used for acquiring the electric signals, outputting first voltage values corresponding to the electric signals and outputting second voltage values after preset time; the pulse width modulation circuit is connected with the time sequence control circuit and is used for outputting first driving voltages according to the first voltage values and outputting second driving voltages according to the second voltage values after preset time; voltage values of the first driving voltages are higher than voltage values of the second driving voltages. The display driving circuit, the method and the liquid crystal display have the advantages that the display panel can be driven to normally work in different temperature environments, and anomaly of work of the display panel can be prevented.
Description
Technical field
The present invention relates to display technology field, in particular to a kind of display driver circuit and its control method, liquid crystal
Display.
Background technology
Traditional liquid crystal display is to control picture using the thin film transistor (TFT) in external drive chip circuit driving panel
Element is realized image and is shown.With the continuous development of technology, driving circuit structure is gradually directly made in display by liquid crystal display
On panel, enter the technology that the gate driver circuit opening and closing the grid controlling thin film transistor (TFT) is integrated in display panels, that is,
GOA (gate driver on array) technology.
But the characteristic of semiconductor of the substrate of display panels is poor, the precision making device is relatively low, less stable,
And temperature, as an important performance characteristic of semiconductor, can affect semiconductor energy gap and minority carrier concentration, cause
Certain temperature drift.So-called temperature drift is exactly under normal operating voltage, leads to grid to drive because of the change of temperature
Dynamic circuit cisco unity malfunction.For example, when temperature is too low, gate driver circuit can not work under normal operating voltage,
Lead to TFT (Thin Film Transistor, TFT) cannot normal work, data filling not exclusively, leads
Cause picture abnormal；At this time, it may be necessary to heighten drive circuit works voltage.In prior art, when display floater is operated in low temperature environment
When lower, in a linear fashion to the driving voltage that output is higher；If display floater works at low ambient temperatures, drive circuit then exports
The higher driving voltage of magnitude of voltage is so that TFT shortens the life-span or is burned out because of higher driving voltage.
Content of the invention
In view of this, the present invention provides a kind of display driver circuit and its control method, liquid crystal display, and the present invention's is aobvious
Show that drive circuit driver display floater can be operated under different temperatures environment, and it is abnormal to avoid result in display floater.
For solving above-mentioned technical problem, a technical scheme proposed by the present invention is：There is provided a kind of display driver circuit, bag
Include：
Temperature sensing circuit, operating ambient temperature, output and the described working environment temperature current for detecting display floater
Spend corresponding electric signal；
Sequential control circuit, for obtaining described electric signal, finds out first voltage value corresponding with described electric signal, defeated
Go out described first voltage value, and export second voltage value after Preset Time；
Pulse-width modulation circuit, is connected with described sequential control circuit, for according to described first voltage value output first drive
Dynamic voltage, and after Preset Time, the second driving voltage is exported according to described second voltage value；
Wherein, the magnitude of voltage of described second driving voltage is less than the magnitude of voltage of described first driving voltage.
Wherein, described display driver circuit also includes timing circuit, and described timing circuit connects described sequential control circuit；
When described sequential control circuit is additionally operable to export described first voltage value, sends to described timing circuit and start timing
Signal；
Described timing circuit is used for starting timing when receiving described beginning timing signal, reaches described in timing duration
During Preset Time, send to described sequential control circuit and terminate timing signal；
Described sequential control circuit is additionally operable to, when receiving described end timing signal, export second voltage value.
Wherein, described sequential control circuit exports second voltage value after Preset Time and is specially output after Preset Time
Second voltage value corresponding with normal temperature.
Wherein, described display driver circuit also includes memory, described memory respectively with described temperature sensing circuit and
Described sequential control circuit connects, for storing described electric signal；
Described sequential control circuit is additionally operable to obtain described electric signal from described memory.
Wherein, described temperature sensing circuit specifically includes voltage detection circuit and signaling conversion circuit；
Described voltage detection circuit is used for detecting and obtains the operating ambient temperature current with display floater corresponding simulation electricity
Signal；
Described signaling conversion circuit is used for receiving described analog electrical signal, and described analog electrical signal is converted to digital telecommunication
Number, export described digital electric signal.
Wherein, described voltage detection circuit includes resistance R1, resistance R2 and thermistor RT, and the one of described thermistor RT
One end of end and described resistance R2 is all grounded, one end connection input voltage VL of described resistance R1, the other end of described resistance R1,
The other end of the other end of resistance R2 and thermistor RT is all connected with the input of described signaling conversion circuit.
Wherein, described sequential control circuit specifically for described display floater be under low temperature environment open when will be described
First voltage value exports to described pulse-width modulation circuit.
Another technical scheme proposed by the present invention is：There is provided a kind of liquid crystal display, this liquid crystal display includes showing
Panel and display driver circuit；
Described display floater includes multiple pixel cells and multiple pixel switch for driving described pixel cell；
Described display driver circuit connects described display floater, for driving described pixel switch to open；
Described display driver circuit includes：
Temperature sensing circuit, operating ambient temperature, output and the described working environment temperature current for detecting display floater
Spend corresponding electric signal；
Sequential control circuit, for obtaining described electric signal, finds out first voltage value corresponding with described electric signal, defeated
Go out described first voltage value, and export second voltage value after Preset Time；
Pulse-width modulation circuit, is connected with described sequential control circuit, for according to described first voltage value output first drive
Dynamic voltage, and after Preset Time, the second driving voltage is exported according to described second voltage value；
Wherein, the magnitude of voltage of described second driving voltage is less than the magnitude of voltage of described first driving voltage.
One technical scheme of the present invention also proposition：A kind of control method of display driver circuit, this control method are provided
Including：
The current operating ambient temperature of detection display floater, exports electric signal corresponding with described operating ambient temperature；
Obtain described electric signal, find out first voltage value corresponding with described electric signal, export described first voltage value,
And export second voltage value after Preset Time；
First driving voltage is exported according to described first voltage value, and is worth according to described second voltage defeated after Preset Time
Go out the second driving voltage；
Wherein, the magnitude of voltage of described second driving voltage is less than the magnitude of voltage of described first driving voltage.
Wherein, the current operating ambient temperature of described detection display floater, output is corresponding with described operating ambient temperature
Electric signal includes：
Detection obtains the corresponding analog electrical signal of the operating ambient temperature current with display floater；
Described analog electrical signal is converted to digital electric signal, exports described digital electric signal.
Beneficial effect：It is different from prior art, the display driver circuit that the present invention provides includes temperature sensing circuit, sequential
Control circuit and pulse-width modulation circuit；Temperature sensing circuit detects the current operating ambient temperature of display floater, output with described
The corresponding electric signal of operating ambient temperature；Sequential control circuit obtains described electric signal, finds out corresponding with described electric signal
First voltage value, exports described first voltage value, and exports second voltage value after Preset Time；Pulse-width modulation circuit, with institute
State sequential control circuit to connect, the first driving voltage is exported according to described first voltage value, and according to described after Preset Time
Second voltage value exports the second driving voltage；Wherein, the magnitude of voltage of described second driving voltage is less than described first driving voltage
Magnitude of voltage.The present invention makes pulse-width modulation circuit export driving voltage corresponding with its operating ambient temperature to display floater, and
Export the second driving voltage it is achieved that driver display floater is operated under different temperatures environment after Preset Time, and
Avoid when display floater works at low ambient temperatures, its driving voltage is always voltage corresponding with low temperature environment, makes display
Panel will not lead to because its driving voltage is too high show abnormal situation.
Brief description
Fig. 1 is the structural representation of display driver circuit first embodiment of the present invention；
Fig. 2 is the structural representation of display driver circuit second embodiment of the present invention；
Fig. 3 is the structural representation of display driver circuit 3rd embodiment of the present invention；
Fig. 4 is the structural representation of display driver circuit fourth embodiment of the present invention；
Fig. 5 is the structural representation of display driver circuit the 5th embodiment of the present invention；
Fig. 6 is the structural representation of display driver circuit sixth embodiment of the present invention；
Fig. 7 is the structural representation of display driver circuit the 7th embodiment of the present invention；
Fig. 8 is the structural representation of display driver circuit the 8th embodiment of the present invention；
Fig. 9 is the structural representation of liquid crystal display one embodiment of the present invention；
Figure 10 is the schematic flow sheet of the control method of display driver circuit of the present invention.
Specific embodiment
For making those skilled in the art more fully understand technical scheme, below in conjunction with the accompanying drawings and be embodied as
Example is described in further detail to a kind of display driver circuit provided by the present invention and its control method, liquid crystal display.?
In accompanying drawing, identical label is used for representing identical units/modules in entire disclosure and accompanying drawing.
Because at different temperatures, the driving voltage needed for display floater is different.Especially at low ambient temperatures, display floater
Required driving voltage is higher than required driving voltage under its normal temperature.When the current operating ambient temperature of display floater is relatively low,
Driving voltage needed for display floater is higher, to meet the normal work of display floater under low temperature environment.But work as display floater work
Make in the relatively low environment of temperature, if being always maintained to make TFT in display floater to the higher driving voltage of display floater output
(thin film transistor (TFT)) lost of life due to too high driving voltage, or even burn.In fact, display floater is only in low temperature ring
The driving voltage of the higher voltage value that needs are mated with this low temperature when just opening under border, after display floater working stability, its drive
Dynamic voltage can return to the driving voltage mating with normal temperature.
Refering to Fig. 1, Fig. 1 is the structural representation of display driver circuit first embodiment of the present invention, as shown in figure 1, this reality
The display driver circuit 100 applying example proposition is used for driving display floater to be shown, this driving display circuit 100 includes order and connects
Temperature sensing circuit 101, sequential control circuit 102 and the pulse-width modulation circuit 103 connecing.Wherein, temperature sensing circuit 101 detects
The current operating ambient temperature of display floater, exports electric signal corresponding with this operating ambient temperature.Sequential control circuit 102 obtains
Take this electric signal, find out first voltage value corresponding with this electric signal, export this first voltage value, and defeated after Preset Time
Go out second voltage value.Pulse-width modulation circuit 103 exports the first driving voltage according to first voltage value, and basis after Preset Time
Second voltage value exports the second driving voltage, and wherein, the magnitude of voltage of described second driving voltage is less than described first driving voltage
Magnitude of voltage.
Specifically, temperature sensing circuit 101 is by its internal temperature-sensitive element working environment temperature current to display floater
Degree is detected, to obtain electric signal corresponding with current operating environment temperature, such as voltage signal, current signal etc., and export
This electric signal.Sequential control circuit 102 obtains this electric signal, in the relation table of default electric signal, temperature value and magnitude of voltage
Search again after searching current temperature value corresponding with this electric signal and obtain first voltage value corresponding with this temperature value, and export
First voltage value.Pulse-width modulation circuit 103 receives first voltage value, exports the first driving voltage according to first voltage value, wherein,
The magnitude of voltage of the first driving voltage is first voltage value.After Preset Time, sequential control circuit 102 exports second voltage value,
Pulse-width modulation circuit 103 receives second voltage value, exports the second driving voltage according to second voltage value, and wherein, second drives electricity
The magnitude of voltage of pressure is second voltage value.Wherein, the magnitude of voltage of the second driving voltage is less than the magnitude of voltage of the first driving voltage, that is,
Second voltage value is less than first voltage value.
It is understood that temperature sensing circuit 101 electric signal that obtains of detection be specifically as follows analog electrical signal or
Digital electric signal.In a concrete application, by digital temperature sensor, temperature sensing circuit 101 can detect that display floater is worked as
Front operating ambient temperature, and then directly obtain corresponding digital electric signal as above-said current signal.
When display floater works at low ambient temperatures, pulse-width modulation circuit 103 is first according to the current work of display floater
Environment temperature exports driving voltage corresponding with this operating ambient temperature, after Preset Time, pulse-width modulation circuit to display floater
103 no longer export driving voltage corresponding with operating ambient temperature to display floater, but are output as another pre- to display floater
If the driving voltage of magnitude of voltage；This preset voltage value is chosen as the driving voltage needed for display floater under normal temperature.
The present embodiment can make pulse-width modulation circuit 103 export driving corresponding with its operating ambient temperature to display floater
Voltage, and it is output as the corresponding driving voltage of another preset voltage value to display floater after Preset Time.Avoid working as display surface
When plate works at low ambient temperatures, its driving voltage is always voltage corresponding with low temperature environment, it is to avoid display floater occurs aobvious
Show abnormal situation.
The voltage being exported by sequential control circuit 102 due to the magnitude of voltage of the driving voltage of pulse-width modulation circuit 103 output
Value determines, the driving voltage that therefore pulse-width modulation circuit 103 exports to display floater in Preset Time can be constant,
The change of the operating ambient temperature of display floater can be as and change.For example, in Preset Time, even if display
The operating ambient temperature of panel changes, and sequential control circuit 102 does not continue to pulse-width modulation circuit 103 output yet and shows
Show the corresponding magnitude of voltage of operating ambient temperature of panel, pulse-width modulation circuit 103 is defeated to display floater all the time in Preset Time
Go out the first driving voltage for first voltage value.Or in Preset Time, sequential control circuit 102 continues to pulse-width modulation circuit
103 output magnitudes of voltage corresponding with the operating ambient temperature of display floater, pulse-width modulation circuit 103 is in Preset Time to display
The driving voltage of panel output is corresponding with the operating ambient temperature of display floater all the time.
In the present embodiment, second voltage value is chosen as the magnitude of voltage of the required driving voltage under normal temperature environment of display floater,
According to the difference of display floater specification, the magnitude of voltage of its required driving voltage is different, and therefore, the present embodiment is to second voltage value
Concrete numerical value be not specifically limited.Further, the present embodiment does not also limit to the concrete time span of Preset Time, in advance
If the time is related to the specification of display floater, the concrete time span of Preset Time needs basis that display floater is carried out testing
Arrive.Optionally, Preset Time is 1 minute, 3 minutes or 5 minutes.
Because at low ambient temperatures, display floater only needs the operating ambient temperature current with it corresponding relatively when opening
High driving voltage.Therefore, in the present embodiment, will when sequential control circuit 102 is opened under display floater is in less than environment
The operating ambient temperature corresponding first voltage value current with display floater exports to pulse-width modulation circuit 103, makes pulsewidth modulation
Circuit 103 is output as the first driving voltage of first voltage value when display floater is opened, to realize driving display floater to open,
And normal work.
Further, integrated timing circuit (in figure is not drawn into) in sequential control circuit 102, works as sequential control circuit
After the first voltage value that 102 outputs are mated with current operating ambient temperature, timing circuit starts timing, when timing duration reaches
During Preset Time, the second voltage value that sequential control circuit 102 output is mated with normal temperature.So that pulse-width modulation circuit 103
According to the current operating ambient temperature of display floater to display floater export corresponding first driving voltage, and after Preset Time to
Display floater exports second driving voltage corresponding with normal temperature.
Additionally, timing circuit can be not integrated in sequential control circuit.Refer to Fig. 2, Fig. 2 is that present invention display drives
The structural representation of circuit second embodiment, the display driver circuit 200 of the present embodiment is the display driver circuit shown in Fig. 1
On the basis of improved, the display driver circuit 200 of the present embodiment also includes timing circuit 204, timing circuit 204 and when
Sequence control circuit 202 connects.
In the present embodiment, temperature sensing circuit 201 is detected by the operating ambient temperature current to display floater, obtains
Take electric signal corresponding with operating ambient temperature.Sequential control circuit 202 obtains this electric signal, finds out corresponding with this electric signal
First voltage value, export this first voltage value, simultaneously sequential control circuit 202 to timing circuit 204 send start timing letter
Number.When pulse-width modulation circuit 203 receives first voltage value, it is output as the drive circuit of first voltage value.Timing circuit 204 exists
Receive and start to start timing during timing signal, when timing duration reaches Preset Time, send to sequential control circuit 202 and terminate
Timing signal.Sequential control circuit 202, when receiving end timing signal, exports second voltage value corresponding with normal temperature.Enter
And making pulse-width modulation circuit 203 be output as the first driving voltage of first voltage value in Preset Time, output afterwards is with often
Second driving voltage for second voltage value of temperature coupling.
In the present embodiment, temperature sensing circuit 201 and pulse-width modulation circuit 203 are electric with the temperature detection shown in Fig. 1 respectively
Road 101 is identical with pulse-width modulation circuit 103, and here is omitted.
Further, refer to Fig. 3, Fig. 3 is the structural representation of display driver circuit 3rd embodiment of the present invention, this reality
The improvement carrying out on the basis of applying the display driver circuit shown in Fig. 2 for the display driver circuit 300 of example.
As shown in figure 3, in the present embodiment, temperature sensing circuit 201 includes voltage detection circuit 2011 and signal conversion electricity
Road 2012, signaling conversion circuit 2012 is connected with voltage detection circuit 2011 and sequential control circuit 202 respectively.Detecting voltage electricity
Road 2011 detects the corresponding analog electrical signal of the operating ambient temperature current with display floater.In a concrete application, in electricity
In pressure circuit for detecting 2011, thermistor is set, and sets a detecting point in voltage detection circuit 2011, when display floater
When operating ambient temperature is different, the resistance of thermistor is also different, leads to voltage detection circuit 2011 to detect in detecting point
Magnitude of voltage is different.Voltage detection circuit 2011 detecting obtains the corresponding analog telecommunications of the operating ambient temperature current with display floater
Number it is in the detecting magnitude of voltage that detects of point.
Voltage detection circuit 2011 sends the analog electrical signal detecting to signaling conversion circuit 2012, signal conversion electricity
This analog electrical signal is converted to digital electric signal by road 2012, and exports this digital electric signal.Wherein, signaling conversion circuit 2012
It can be digital-to-analogue (A/D) converter.
Sequential control circuit 202, pulse-width modulation circuit 203 and timing circuit 204 and the display shown in Fig. 2 in the present embodiment
Drive circuit is identical, and here is omitted.
Further, refer to Fig. 4, Fig. 4 is the structural representation of display driver circuit fourth embodiment of the present invention, this reality
The improvement carrying out on the basis of applying the display driver circuit shown in Fig. 3 for the display driver circuit 400 of example.
As shown in figure 4, the display driver circuit 400 of the present embodiment also includes memory 205, memory 205 respectively with temperature
The signaling conversion circuit 2012 of degree testing circuit 201 and sequential control circuit 202 connect, for storage temperature testing circuit 201
The electric signal of output.Temperature sensing circuit 201 detects the current operating ambient temperature of display floater, to memory 205 output with
The corresponding electric signal of operating ambient temperature, memory 205 preserves to the electric signal receiving；Sequential control circuit 202 from
The electric signal of preservation is obtained, to carry out aforesaid operations in this memory 205.
The type of memory 205 includes but is not limited to electric erasable programmable memory device (EEPROM).
Additionally, sequential control circuit 202 in the present embodiment, pulse-width modulation circuit 203 and timing circuit 204 with shown in Fig. 3
Display driver circuit identical, here is omitted.
Refer to Fig. 5, Fig. 5 is the structural representation of display driver circuit the 5th embodiment of the present invention.The present embodiment proposes
Display driver circuit 500 include temperature sensing circuit 301, pulse-width modulation circuit 302 and sequential control circuit 303.Wherein, arteries and veins
It is provided with memory (in figure is not drawn into) in wide modulation circuit 302.Temperature sensing circuit 301 connects pulse-width modulation circuit 302, arteries and veins
Wide modulation circuit 302 is connected by I2C bus with sequential control circuit 303；Temperature sensing circuit 301 detection display floater is current
Operating ambient temperature, export electric signal corresponding with operating ambient temperature, and export this electric signal to pulse-width modulation circuit 302
Memory in.Sequential control circuit 303 obtains this electric signal by I2C bus from the memory of pulse-width modulation circuit 302,
Find out first voltage value corresponding with electric signal, export first voltage value to pulse-width modulation circuit 302, and after Preset Time
Output second voltage value is to pulse-width modulation circuit 302.Pulse-width modulation circuit 302 drives electricity according to first voltage value output first
Pressure, and after Preset Time, the second driving voltage is exported according to second voltage value, wherein, second voltage value is less than first voltage
Value.
Temperature in the temperature sensing circuit 301 of the present embodiment, pulse-width modulation circuit 302 and sequential control circuit 303 and Fig. 1
Degree testing circuit 301, pulse-width modulation circuit 302 are identical with sequential control circuit 303, and here is omitted.
Refer to Fig. 6, Fig. 6 is the structural representation of display driver circuit sixth embodiment of the present invention, the present embodiment aobvious
Show that drive circuit is the improvement carrying out on the basis of the display driver circuit shown in Fig. 5, the display driver circuit of the present embodiment
600 also include timing circuit 404, and timing circuit 404 is connected with sequential control circuit 403.
When sequential control circuit 403 is to pulse-width modulation circuit 402 output first voltage value, sends to timing circuit 404 and open
Beginning timing signal；Timing circuit 404 starts timing when receiving and starting timing signal, when timing duration reaches Preset Time,
Send to sequential control circuit 403 and terminate timing signal.Sequential control circuit 403 receive terminate timing signal when, to arteries and veins
Wide modulation circuit 402 exports second voltage value corresponding with normal temperature.And then make pulse-width modulation circuit 402 defeated in Preset Time
Go out the driving voltage of the first voltage value that the operating ambient temperature current with display floater mates, output afterwards is mated with normal temperature
The driving voltage of second voltage value.
In the present embodiment, temperature sensing circuit 401 and pulse-width modulation circuit 402 are electric with the temperature detection shown in Fig. 5 respectively
Road 301 is identical with pulse-width modulation circuit 302, and here is omitted.
Refer to Fig. 7, Fig. 7 is the structural representation of display driver circuit the 7th embodiment of the present invention, the present embodiment aobvious
Show that the temperature sensing circuit 401 of drive circuit 700 includes voltage detection circuit 4011 and signaling conversion circuit 4012；Signal is changed
Circuit 4012 is connected with voltage detection circuit 4011 and sequential control circuit 403 respectively.Voltage detection circuit 4011 detect with
The corresponding analog electrical signal of the current operating ambient temperature of display floater, and export this analog electrical signal；Signaling conversion circuit
4012 this analog electrical signal of reception, analog electrical signal is converted to digital electric signal.
Specifically, voltage detection circuit 4011 includes resistance R1, resistance R2 and thermistor RT, one end of thermistor RT
All it is grounded with one end of resistance R2, one end of resistance R1 connects input voltage VL, the other end of resistance R1, the other end of resistance R2
It is all connected with the input of signaling conversion circuit 4012 with the other end of thermistor RT, the input of signaling conversion circuit 2012 is made
Detecting point for voltage detection circuit 4011.The resistance of thermistor RT is affected by operating ambient temperature and is led to its resistance
Value changes, thus leading to detect the corresponding change of magnitude of voltage generation at point, voltage detection circuit 4011 detecting obtains and shows
Show that the corresponding analog electrical signal of the current operating ambient temperature of panel is the magnitude of voltage detecting in detecting point.For example, temperature
During for T1, the resistance of thermistor RT is R, and the magnitude of voltage at now detecting point corresponds to V1；When temperature is T2, thermistor RT
Resistance be r, now detecting point at magnitude of voltage correspond to V2.
Signaling conversion circuit 4012 in the present embodiment is identical with the signaling conversion circuit 2012 shown in Fig. 3, herein no longer
Repeat.
Refer to Fig. 8, Fig. 8 be display driver circuit the 8th embodiment of the present invention structural representation the present embodiment in timing
Circuit (the non-label of in figure) is integrated in sequential control circuit.
Refer to Fig. 9, Fig. 9 is the structural representation of liquid crystal display one embodiment of the present invention, as shown in figure 9, this enforcement
The liquid crystal display 900 of example includes display floater 501 and display driver circuit 502, and display floater 501 includes multiple pixel cells
With multiple pixel switches for driving pixel cell, specially TFT.Display driver circuit 502 connects display floater 501, uses
Open in driving pixel switch.
Display driver circuit 502 in the present embodiment can be the display in any one embodiment shown in Fig. 1 to Fig. 8
Drive circuit.
In the present embodiment, display driver circuit can be according to the current operating ambient temperature of display floater, in Preset Time
The corresponding driving voltage of interior output, and export default driving voltage after Preset Time.Avoid when display floater is in low temperature ring
When working under border, its driving voltage is always voltage corresponding with low temperature environment, it is to avoid the abnormal shape of display in display floater
Condition.Improve service life and the display quality of liquid crystal display.
As shown in Figure 10, Figure 10 is the schematic flow sheet of the control method of display driver circuit of the present invention, this control method
Comprise the steps：
The current operating ambient temperature of S101, detection display floater, exports electric signal corresponding with operating ambient temperature.
If display driver circuit is the display driver circuit 100 shown in Fig. 1 to Fig. 4, this step is by temperature sensing circuit 101
Execution, here is omitted.If display driver circuit is the display driver circuit 200 shown in Fig. 5 to Fig. 8, this step is by temperature
Testing circuit 201 executes, and here is omitted.
S102, acquisition electric signal, find out first voltage value corresponding with electric signal, export first voltage value, and pre-
If exporting second voltage value after the time.
If display driver circuit is the display driver circuit 100 shown in Fig. 1 to Fig. 4, this step is by sequential control circuit 102
Execution, sequential control circuit 102 directly obtains this electric signal from temperature sensing circuit 101, or obtains from external memory
This electric signal.If display driver circuit is the display driver circuit 200 shown in Fig. 5 to Fig. 8, because temperature sensing circuit 201 is defeated
The electric signal going out is to send to the memory of the inside of pulse-width modulation circuit 202, and sequential control circuit 203 is from pulsewidth modulation electricity
This electric signal is obtained in the memory of the inside on road 202.
S103, according to first voltage value export the first driving voltage, and after Preset Time according to second voltage value export
Second driving voltage.
Wherein, the magnitude of voltage of the second driving voltage is less than the magnitude of voltage of the first driving voltage.
If display driver circuit is the display driver circuit 100 shown in Fig. 1 to Fig. 4, this step is by pulse-width modulation circuit 103
Execution, here is omitted.If display driver circuit is the display driver circuit 200 shown in Fig. 5 to Fig. 8, this step is by pulsewidth
Modulation circuit 202 executes, and here is omitted.
The control method of the present embodiment can export in Preset Time according to the current operating ambient temperature of display floater
Corresponding driving voltage, and export default driving voltage after Preset Time.Avoid when display floater work at low ambient temperatures
When making, its driving voltage is always voltage corresponding with low temperature environment, it is to avoid the abnormal situation of display in display floater.Improve
The service life of liquid crystal display and display quality.
These are only embodiments of the invention, not thereby limit the present invention scope of patent protection, every using this
Equivalent structure or equivalent flow conversion that bright specification and accompanying drawing content are made, or directly or indirectly it is used in other related skills
Art field, all includes the scope of patent protection in the present invention in the same manner.
Claims (10)
1. a kind of display driver circuit is it is characterised in that include：
Temperature sensing circuit, operating ambient temperature, output and the described operating ambient temperature pair current for detecting display floater
The electric signal answered；
Sequential control circuit, for obtaining described electric signal, finds out first voltage value corresponding with described electric signal, exports institute
State first voltage value, and export second voltage value after Preset Time；
Pulse-width modulation circuit, is connected with described sequential control circuit, for driving electricity according to described first voltage value output first
Pressure, and after Preset Time, the second driving voltage is exported according to described second voltage value；
Wherein, the magnitude of voltage of described second driving voltage is less than the magnitude of voltage of described first driving voltage.
2. display driver circuit according to claim 1 is it is characterised in that described display driver circuit also includes timing electricity
Road, described timing circuit connects described sequential control circuit；
When described sequential control circuit is additionally operable to export described first voltage value, sends to described timing circuit and start timing letter
Number；
Described timing circuit is used for starting timing when receiving described beginning timing signal, reaches described default in timing duration
During the time, send to described sequential control circuit and terminate timing signal；
Described sequential control circuit is additionally operable to, when receiving described end timing signal, export second voltage value.
3. display driver circuit according to claim 1 and 2 is it is characterised in that described sequential control circuit is when default
Between after output second voltage value be specially after Preset Time export second voltage value corresponding with normal temperature.
4. display driver circuit according to claim 1 is it is characterised in that described display driver circuit also includes storing
Device, described memory is connected with described temperature sensing circuit and described sequential control circuit respectively, for storing described electric signal；
Described sequential control circuit is additionally operable to obtain described electric signal from described memory.
5. display driver circuit according to claim 1 is it is characterised in that described temperature sensing circuit specifically includes voltage
Circuit for detecting and signaling conversion circuit；
Described voltage detection circuit is used for detecting and obtains the corresponding analog electrical signal of the operating ambient temperature current with display floater；
Described signaling conversion circuit is used for receiving described analog electrical signal, and described analog electrical signal is converted to digital electric signal,
Export described digital electric signal.
6. display driver circuit according to claim 5 it is characterised in that described voltage detection circuit include resistance R1,
Resistance R2 and thermistor RT, one end of one end of described thermistor RT and described resistance R2 is all grounded, described resistance R1's
One end connects input voltage VL, and the other end of the other end, the other end of resistance R2 and thermistor RT of described resistance R1 all connects
Connect the input of described signaling conversion circuit.
7. display driver circuit according to claim 1 is it is characterised in that described sequential control circuit is specifically in institute
State when display floater is in unlatching under low temperature environment and export described first voltage value to described pulse-width modulation circuit.
8. a kind of liquid crystal display is it is characterised in that include display floater and display driver circuit, described display floater includes many
Individual pixel cell and multiple pixel switch for driving described pixel cell；
Described display driver circuit connects described display floater, for driving described pixel switch to open；
Described display driver circuit includes：
Temperature sensing circuit, operating ambient temperature, output and the described operating ambient temperature pair current for detecting display floater
The electric signal answered；
Sequential control circuit, for obtaining described electric signal, finds out first voltage value corresponding with described electric signal, exports institute
State first voltage value, and export second voltage value after Preset Time；
Pulse-width modulation circuit, is connected with described sequential control circuit, for driving electricity according to described first voltage value output first
Pressure, and after Preset Time, the second driving voltage is exported according to described second voltage value；
Wherein, the magnitude of voltage of described second driving voltage is less than the magnitude of voltage of described first driving voltage.
9. a kind of control method of display driver circuit is it is characterised in that include：
The current operating ambient temperature of detection display floater, exports electric signal corresponding with described operating ambient temperature；
Obtain described electric signal, find out first voltage value corresponding with described electric signal, export described first voltage value, and
Second voltage value is exported after Preset Time；
First driving voltage is exported according to described first voltage value, and according to described second voltage value output the after Preset Time
Two driving voltages；
Wherein, the magnitude of voltage of described second driving voltage is less than the magnitude of voltage of described first driving voltage.
10. control method according to claim 9 is it is characterised in that the current working environment of described detection display floater
Temperature, exports electric signal corresponding with described operating ambient temperature and includes：
Detection obtains the corresponding analog electrical signal of the operating ambient temperature current with display floater；
Described analog electrical signal is converted to digital electric signal, exports described digital electric signal.
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| CN201611002859.1A CN106448604A (en) | 2016-11-09 | 2016-11-09 | Display driving circuit, method for controlling same and liquid crystal display |
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| CN201611002859.1A CN106448604A (en) | 2016-11-09 | 2016-11-09 | Display driving circuit, method for controlling same and liquid crystal display |
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Application publication date: 20170222 |