CN109859703A - Display control unit, display control method and display equipment - Google Patents
Display control unit, display control method and display equipment Download PDFInfo
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- CN109859703A CN109859703A CN201910016249.4A CN201910016249A CN109859703A CN 109859703 A CN109859703 A CN 109859703A CN 201910016249 A CN201910016249 A CN 201910016249A CN 109859703 A CN109859703 A CN 109859703A
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Abstract
The present invention provides a kind of display control unit, comprising: detection module, for detecting whether display equipment is in shutdown responsive state, if so, generating first control signal；Display control module, for generating black plug frame signal according to the first control signal, to control the picture that the display panel of the display equipment shows that grayscale is zero.Correspondingly, the present invention also provides a kind of display control methods and a kind of display equipment.The present invention can eliminate power-off ghost shadow.
Description
Technical field
The present invention relates to field of display technology, and in particular to a kind of display control unit, display control method and display are set
It is standby.
Background technique
Liquid crystal display (Liquid Crystal Display, LCD) has been applied to include computer, mobile phone and TV
In equal electronic equipments.Liquid crystal display generally comprises the array substrate being oppositely arranged and color membrane substrates and is set to array substrate
Liquid crystal layer between color membrane substrates.When liquid crystal display is shown, driving circuit charges to each pixel, with control
Liquid crystal molecule deflection processed.However, the charge stored in pixel unit is unable to pop-off, therefore in liquid crystal display shutdown
It will lead to the influence that display still remains the last one picture, that is, generate power-off ghost shadow.
Summary of the invention
The present invention is directed at least solve one of the technical problems existing in the prior art, a kind of display control dress is proposed
Set, display control method and display equipment.
To achieve the goals above, the present invention provides a kind of display control unit, comprising:
Detection module, for detecting whether display equipment is in shutdown responsive state, if so, generating the first control letter
Number；
Display control module is set for generating black plug frame signal according to the first control signal with controlling the display
Standby display panel shows the picture that grayscale is zero.
Optionally, the display control module is connected with operating voltage end；The operating voltage end and the display equipment
Feeder ear be connected, to generate and the positively related voltage signal of voltage of the feeder ear；
The detection module includes:
Voltage detecting submodule, for generating corresponding detection voltage, the inspection according to the voltage at the operating voltage end
The voltage for surveying voltage and the operating voltage end is positively correlated；
Comparative sub-module, for the detection voltage to be compared with preset value, and be less than in the detection voltage or
When equal to the preset value, determine that the display equipment is in the shutdown responsive state；It is greater than in the detection voltage described
When preset value, second control signal is generated；
The display control unit further include: charge-discharge modules, for being mentioned according to the second control signal to feeder ear
The voltage of confession is stored, and provides voltage according to the first control signal for the display control module.
Optionally, the voltage detecting submodule includes: first resistor and second resistance, the first resistor and the second electricity
Resistance is connected between the operating voltage end and reference voltage end, and the detection voltage is the first resistor and second electricity
Hinder the voltage of connecting node.
Optionally, the charge-discharge modules include: that control unit, first switch unit, second switch unit and storage are single
Member；
The first end of the first switch unit is connected with the feeder ear, the second end of the first switch unit and institute
The first end for stating storage unit is connected, and the third end of the first switch unit is connected with the second end of the storage unit；
The first end of the storage unit is connected with reference voltage end；
The first end of the second switch unit is connected with the third end of the storage unit, the second switch unit
Second end is connected with the operating voltage end；
Described control unit is used for the second end and third of the first switch unit according to the first control signal
End conducting, first end and third end disconnect, and the first end and second end of the second switch unit is connected；And according to institute
It states second control signal and the second end of the first switch unit is connected with the disconnection of third end, first end with third end, and will
The first end and second end of the second switch unit disconnects.
Optionally, the storage unit includes capacitor and 3rd resistor, and the both ends of the capacitor are respectively with described with reference to electricity
Pressure side is connected with the first end of the second switch unit, the both ends of the 3rd resistor respectively with the first switch unit
Third end is connected with the first end of the second switch unit.
Optionally, the first switch unit includes single-pole double-throw switch (SPDT).
Optionally, the reference voltage end is ground terminal.
Correspondingly, the present invention also provides a kind of display equipment, including display panel and above-mentioned display control unit.
Correspondingly, the present invention also provides a kind of display control methods using above-mentioned display control unit, comprising:
Detect whether display equipment is in shutdown responsive state using the detection module, if so, utilizing the display
Control module generates black plug frame signal, to control the picture that the display panel of the display equipment shows that grayscale is zero.
Optionally, when the display control module is connected with operating voltage end, the operating voltage end is set with the display
When standby feeder ear is connected,
The detection shows that the step of whether equipment is in shutdown responsive state includes:
Corresponding detection voltage, the detection voltage and the operating voltage are generated according to the voltage at the operating voltage end
The voltage at end is positively correlated；
The detection voltage is compared with preset value, when the detection voltage is less than or equal to the preset value,
Determine that the display equipment is in the shutdown responsive state；
The display control method further include:
When the detection voltage is greater than the preset value, the voltage that the feeder ear provides is carried out using storage unit
Storage；
When the detection voltage is less than or equal to the preset value, using the storage unit to the operating voltage end
Voltage is provided.
Detailed description of the invention
The drawings are intended to provide a further understanding of the invention, and constitutes part of specification, with following tool
Body embodiment is used to explain the present invention together, but is not construed as limiting the invention.In the accompanying drawings:
Fig. 1 is the structural schematic diagram for the display control unit that the embodiment of the present invention one provides；
Fig. 2 is the structural schematic diagram of display control module provided by Embodiment 2 of the present invention；
Fig. 3 is the concrete structure schematic diagram of display control unit provided by Embodiment 2 of the present invention；
Fig. 4 is that the embodiment of the present invention four provides a kind of process signal of display control method using display control unit
Figure.
Specific embodiment
Below in conjunction with attached drawing, detailed description of the preferred embodiments.It should be understood that this place is retouched
The specific embodiment stated is merely to illustrate and explain the present invention, and is not intended to restrict the invention.
In a liquid crystal display, shift register is that the grid line of display panel provides scanning signal line by line, to control display
The pixel of panel receives data-signal line by line, to open line by line；And when one-row pixels are shown instantly, lastrow pixel exists
Display state is kept under the action of storage capacitance.Shutdown in a flash, the charge stored in pixel unit is unable to pop-off,
To will cause power-off ghost shadow.
Power-off ghost shadow is generally eliminated by XAO function in the prior art, that is, pass through electrical level transferring chip when shutdown
(Level Shifter) detects XAO voltage, when XAO voltage drop is as low as a certain threshold value, low electricity that shift register is connected
Flat voltage high is to high level voltage, to open the thin film transistor (TFT) in each pixel unit, thus to each pixel unit into
Row electric discharge.But this mode is actually filled to shift register cell when discharging pixel voltage
Electricity, therefore easily lead to shift register cell and generate charge accumulated, there is abnormal show so as to cause display panel, simultaneously
Also it can shorten the service life of display panel to a certain extent.
In order to effectively eliminate power-off ghost shadow, and display panel is not influenced and is normally shown and display panel service life, present invention reality
It applies example one and provides a kind of for showing the display control unit in equipment, display equipment includes display panel.Fig. 1 is that the present invention is real
The structural schematic diagram that the display control unit of the offer of example one is provided, as shown in Figure 1, display control unit includes: 10 He of detection module
Display control module 20.
Detection module 10 is for detecting whether display equipment is in shutdown responsive state, if so, detection module 10 generates
First control signal.Wherein, shutdown responsive state refers to display equipment in the state of shutdown response phase, the shutdown response phase
A period of time after shutdown command starts is received for display equipment, specifically, shutdown response phase can be display equipment
The voltage of feeder ear is reduced to the stage of preset threshold (preset threshold is greater than or equal to 0) from operating voltage；And in the shutdown
Response phase, there is no releases completely for the charge in display panel in pixel unit.
Display control module 20 is used to generate black plug frame signal according to the first control signal, is set with controlling the display
Standby display panel shows the picture that grayscale is zero, that is, black picture.Wherein, display control module 20 may include timing control
Circuit (TCON), gate driving circuit and source electrode drive circuit, sequential control circuit generate black plug frame according to first control signal
Signal；At this point, gate driving circuit is that display panel provides scanning signal, source electrode drive circuit line by line according to the black plug frame signal
Data-signal is provided for each pixel unit, to drive the grayscale of pixel unit to reach 0.
In the present embodiment one, when showing that equipment is in shutdown responsive state, display control module 20 controls display surface
Plate shows the picture that grayscale is zero, and therefore, the picture that user sees during shutdown is black picture, and shows and complete in black picture
Afterwards, even if still residual charge, the remaining image of display panel are also black picture in pixel unit, so that pixel unit is aobvious
Show while black picture and carries out nature electric discharge after the black picture of display.Therefore, the present invention can eliminate power-off ghost shadow, and not shadow
Ring the service life of the normal display and display panel of display panel.
Fig. 2 is the structural schematic diagram of display control module provided by Embodiment 2 of the present invention, as shown in Fig. 2, display control
Module 20 is connected with operating voltage end DVDD, and the operating voltage end DVDD is connected with the feeder ear VIN of the display equipment, with
Generate the positively related voltage signal of voltage with feeder ear VIN.Feeder ear VIN can pass through voltage drop circuit or device and work
Voltage end DVDD is connected, so that the voltage of operating voltage end DVDD is lower than the voltage of feeder ear.Detection module 10 can specifically lead to
The voltage of directly or indirectly detection operating voltage end DVDD is crossed, to judge to show whether equipment is in shutdown responsive state.
Specifically, detection module 10 includes: voltage detecting submodule 11 and Comparative sub-module 12.Wherein, voltage detecting
Module 11 is used to generate corresponding detection voltage, the detection voltage and operating voltage end according to the voltage of operating voltage end DVDD
The voltage of DVDD is positively correlated.Comparative sub-module 12 is compared for will test voltage with preset value, and is less than in detection voltage
Or when being equal to the preset value, determine that the display equipment is in the shutdown responsive state；It is greater than institute in the detection voltage
When stating preset value, second control signal is generated.Wherein, preset value can be the minimum of display control module 20, example
It such as, is 3.3V ± 0.5V in the operating voltage of display control module 20, then preset value is that operating voltage reaches corresponding when 2.8V
Detect voltage.
In this case, after showing device powers down, the voltage of feeder ear VIN declines, so that operating voltage end DVDD
Voltage decline therewith, and when operating voltage end DVDD voltage drop to display control module 20 minimum it
Afterwards, display control module 20 then can not work normally.For example, the operating voltage of display control module 20 is 3.3V ± 0.5V, that is,
When normal display, the voltage of operating voltage end DVDD is 3.3V, when the voltage drop of operating voltage end DVDD is down to 2.8V, is then shown
Show that control module 20 can not work.In actual products, the time of the voltage drop of feeder ear VIN down to 0V it is very short (for example,
27FHD (that is, 27 inches, resolution ratio 1920*1080), 60Hz display product in, the voltage of feeder ear VIN drops to 0V's
Time is only 50ms or so), and the voltage drop of operating voltage end DVDD is down to the time of 0V and the voltage drop of feeder ear down to 0V
Time be consistent, therefore, after display equipment shutdown (that is, feeder ear VIN power-off after), display control module 20 can be normal
The time of work is shorter.
In order to guarantee that display control module 20 can at least drive display panel to show that a frame is drawn when showing equipment shutdown
Face, as shown in Fig. 2, display control unit is other than including above-mentioned detection module 10 and display control module 20, it further include filling
Discharge module 30, for being stored according to the second control signal to the feeder ear VIN voltage provided, and according to described
One control signal is that display control module 20 provides voltage.
Fig. 3 is the concrete structure schematic diagram of display control unit provided by Embodiment 2 of the present invention, as shown in figure 3, voltage
Detection sub-module 11 includes: first resistor R1 and second resistance R2, and first resistor R1 and second resistance R2 are connected on operating voltage
It holds between DVDD and reference voltage end VSS, the detection voltage is the voltage of first resistor R1 and second resistance R2 connecting node.
Optionally, reference voltage end VSS is ground terminal.
At this point, detection voltage VInspectionWith the relationship of the voltage Vdd of operating voltage end DVDD are as follows: VInspection=(r2/ (r1+r2)) *
Vdd；Wherein, r1 is the resistance value of first resistor R1；R2 is the resistance value of second resistance R2.In practical applications, the production of different batches
Operating voltage corresponding to display control module in product may difference therefore shown in equipment in different batches, can be with
By adjusting the resistance value of first resistor R1 and second resistance R2, so that different display control units correspond to identical preset value.
Charge-discharge modules 30 specifically include: control unit 34, first switch unit 31, second switch unit 32 and storage are single
Member 33.
The first end of first switch unit 31 is connected with feeder ear VIN, and the second end of first switch unit 31 and storage are single
The first end of member 33 is connected, and the third end of first switch unit 31 is connected with the second end of storage unit 33.Storage unit 33
First end is connected with reference voltage end VSS.Wherein, first switch unit 31 can be single-pole double-throw switch (SPDT)；Storage unit 33 can
Think RC charging-discharging structure, specifically include capacitor C and 3rd resistor R3, the both ends of capacitor C respectively with reference voltage end VSS and
The first end of two switch units 32 is connected, and the both ends of 3rd resistor R3 are opened with the third end of first switch unit 31 and second respectively
The first end for closing unit 32 is connected.
The first end of second switch unit 32 is connected with the third end (that is, one end of capacitor C) of storage unit 33, and second opens
The second end for closing unit 32 is connected with operating voltage end DVDD.Second switch unit 32 can be single-pole single-throw switch (SPST).
Control unit 34 is used to be disconnected the first end of first switch unit 31 and third end according to first control signal, the
Two ends are connected with third end, and the first end and second end of second switch unit 32 is connected；And according to second control signal
The second end of first switch unit 31 and third end are disconnected, first end is connected with third end, and by second switch unit 32
First end and second end disconnects.
Therefore, in display equipment when normally being shown, the first end of first switch unit 31 is connected with third end, the
The first end and second end of two switch units 32 disconnects, and feeder ear VIN is the charging of storage unit 33；When display equipment receives pass
Machine instruction and when detection voltage drop is down to preset value, then the second end of first switch unit 31 is connected with third end, second switch
The first end and second end of unit 32 is connected, so that storage unit 33 provides voltage, Jin Erbao to operating voltage end DVDD
Card display control module can remain to work normally after the decline of the voltage of feeder ear.
For the display equipment of the prior art, when feeder ear is reduced to 0, the storage of storage capacitance is made within the pixel
Under, pixel can still show the gray scale of last frame, after receiving shutdown command so as to cause display device, still have certain residual
Shadow, the time of the ghost can remain to feeder ear and be reduced to after 0, and the display control unit of the embodiment of the present invention two can be
It when display equipment is normally shown, charges to storage unit 33, and in the shutdown of display equipment and the electricity of operating voltage end DVDD
It discharges when pressure reaches the minimum of display control module the operating voltage end DVDD of display control module 20, to guarantee
Display control module 20 can be worked normally when showing equipment shutdown, and control the display panel the black picture of display, and the electricity that works
The time of the voltage drop of pressure side DVDD down to the minimum of display control module is very short, and human eye is not in this period
It can observe ghost, therefore, for human eye, what is seen after shutdown is black picture, to eliminate power-off ghost shadow.
The embodiment of the present invention three provides a kind of display equipment, including display panel and above-described embodiment one or embodiment two
Display control unit.Wherein, display panel is liquid crystal display panel.The detection module and charge-discharge modules of display control unit can
To be integrated in power supply shutdown integrated chip (Power Management IC, PMIC) of display equipment.
The display equipment can be with are as follows: Electronic Paper, mobile phone, tablet computer, television set, display, laptop, number
Any products or components having a display function such as photo frame, navigator.
Since above-mentioned display control unit can control the display panel the black picture of display when showing equipment shutdown,
It can be eliminated using the power-off ghost shadow of the display equipment of above-mentioned display control unit, and will not influence the service life of display equipment.
Fig. 4 is that the embodiment of the present invention four provides a kind of process signal of display control method using display control unit
Figure, as shown in figure 4, display control method includes:
S1, detect whether display equipment is in shutdown responsive state using detection module, if so, carrying out step S2.
S2, black plug frame signal is generated using display control module, shows that grayscale is to control the display panel of display equipment
Zero picture.
As described above, operating voltage end is connected with the feeder ear of display equipment, at this point, step S1 includes:
S11, corresponding detection voltage is generated according to the voltage at operating voltage end, detects the voltage of voltage and operating voltage end
It is positively correlated.Step S11 can use above-mentioned voltage detecting submodule and execute.
S12, it will test voltage and preset value compares, when detecting voltage and being less than or equal to preset value, determine display
Equipment is in shutdown responsive state.Step S12 can use above-mentioned Comparative sub-module and execute.
Further, when the judging result in step S12 is that detection voltage is greater than preset value, display control method is also wrapped
It includes: S13, being stored using the voltage that storage unit provides feeder ear；When the judging result in step S12 is detection voltage
When less than or equal to preset value, display control method further include: voltage S14, is provided to operating voltage end using storage unit, with
Guarantee that display control module can at least drive display panel to show a frame picture when showing equipment shutdown.
It is described above using the principle that display control unit carries out display control, which is not described herein again.
It is understood that the principle that embodiment of above is intended to be merely illustrative of the present and the exemplary implementation that uses
Mode, however the present invention is not limited thereto.For those skilled in the art, essence of the invention is not being departed from
In the case where mind and essence, various changes and modifications can be made therein, these variations and modifications are also considered as protection scope of the present invention.
Claims (10)
1. a kind of display control unit characterized by comprising
Detection module, for detecting whether display equipment is in shutdown responsive state, if so, generating first control signal；
Display control module, for generating black plug frame signal according to the first control signal, to control the display equipment
Display panel shows the picture that grayscale is zero.
2. display control unit according to claim 1, which is characterized in that the display control module and operating voltage end
It is connected；The operating voltage end is connected with the feeder ear of the display equipment, is positively correlated with generating with the voltage of the feeder ear
Voltage signal；
The detection module includes:
Voltage detecting submodule, for generating corresponding detection voltage, the detection electricity according to the voltage at the operating voltage end
Pressure and the voltage at the operating voltage end are positively correlated；
Comparative sub-module is less than or equal to for comparing the detection voltage with preset value, and in the detection voltage
When the preset value, determine that the display equipment is in the shutdown responsive state；It is greater than in the detection voltage described default
When value, second control signal is generated；
The display control unit further include: charge-discharge modules, for what is provided according to the second control signal feeder ear
Voltage is stored, and provides voltage according to the first control signal for the display control module.
3. display control unit according to claim 2, which is characterized in that the voltage detecting submodule includes: first
Resistance and second resistance, the first resistor and second resistance are connected between the operating voltage end and reference voltage end, institute
State the voltage that detection voltage is the first resistor and the second resistance connecting node.
4. display control unit according to claim 2, which is characterized in that the charge-discharge modules include: control unit,
First switch unit, second switch unit and storage unit；
The first end of the first switch unit is connected with the feeder ear, and the second end of the first switch unit is deposited with described
The first end of storage unit is connected, and the third end of the first switch unit is connected with the second end of the storage unit；
The first end of the storage unit is connected with reference voltage end；
The first end of the second switch unit is connected with the third end of the storage unit, and the second of the second switch unit
End is connected with the operating voltage end；
Described control unit is for leading the second end of the first switch unit with third end according to the first control signal
Logical, first end and third end disconnect, and the first end and second end of the second switch unit is connected；And according to described
Two control signals disconnect the second end of the first switch unit with third end, first end is connected with third end, and will be described
The first end and second end of second switch unit disconnects.
5. display control unit according to claim 4, which is characterized in that the storage unit includes capacitor and third electricity
Resistance, the both ends of the capacitor are connected with the first end of the reference voltage end and the second switch unit respectively, the third
The both ends of resistance are connected with the first end at the third end of the first switch unit and the second switch unit respectively.
6. display control unit according to claim 4, which is characterized in that the first switch unit includes single-pole double throw
Switch.
7. display control unit according to claim 4, which is characterized in that the reference voltage end is ground terminal.
8. a kind of display equipment, which is characterized in that including display described in any one of display panel and claim 1 to 7
Control device.
9. a kind of display control method using display control unit described in any one of claim 1 to 7, feature exist
In, comprising:
Detect whether display equipment is in shutdown responsive state using the detection module, if so, utilizing the display control
Module generates black plug frame signal, to control the picture that the display panel of the display equipment shows that grayscale is zero.
10. display control method according to claim 9, which is characterized in that when the display control module and work electricity
Pressure side is connected, when the operating voltage end is connected with the feeder ear of the display equipment,
The detection shows that the step of whether equipment is in shutdown responsive state includes:
Corresponding detection voltage, the detection voltage and the operating voltage end are generated according to the voltage at the operating voltage end
Voltage is positively correlated；
The detection voltage is compared with preset value, when the detection voltage is less than or equal to the preset value, is determined
The display equipment is in the shutdown responsive state；
The display control method further include:
When the detection voltage is greater than the preset value, deposited using the voltage that storage unit provides the feeder ear
Storage；
When the detection voltage is less than or equal to the preset value, provided using the storage unit to the operating voltage end
Voltage.
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| CN113314084A (en) * | 2021-05-31 | 2021-08-27 | 惠科股份有限公司 | Display panel driving method and device and display panel |
| WO2022226681A1 (en) * | 2021-04-25 | 2022-11-03 | 京东方科技集团股份有限公司 | Display apparatus and control method therefor |
| WO2023123128A1 (en) * | 2021-12-29 | 2023-07-06 | 京东方科技集团股份有限公司 | Power source circuit and driving method therefor, and display apparatus |
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