CN109859703B - Display control device, display control method, and display apparatus - Google Patents
Display control device, display control method, and display apparatus Download PDFInfo
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- CN109859703B CN109859703B CN201910016249.4A CN201910016249A CN109859703B CN 109859703 B CN109859703 B CN 109859703B CN 201910016249 A CN201910016249 A CN 201910016249A CN 109859703 B CN109859703 B CN 109859703B
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Abstract
The present invention provides a display control apparatus, including: the detection module is used for detecting whether the display equipment is in a shutdown response state, and if so, generating a first control signal; and the display control module is used for generating a black frame insertion signal according to the first control signal so as to control a display panel of the display equipment to display a picture with zero gray scale. Correspondingly, the invention further provides a display control method and display equipment. The invention can eliminate shutdown ghost.
Description
Technical Field
The invention relates to the technical field of display, in particular to a display control device, a display control method and display equipment.
Background
Liquid Crystal Displays (LCDs) have been used in electronic devices including computers, mobile phones, and televisions. The liquid crystal display generally includes an array substrate and a color filter substrate disposed opposite to each other, and a liquid crystal layer disposed between the array substrate and the color filter substrate. When the liquid crystal display displays, the driving circuit charges each pixel to control the liquid crystal molecule deflection. However, when the lcd is turned off, the charges stored in the pixel units cannot disappear instantly, so that the display still has the effect of the last frame, i.e. the image sticking occurs.
Disclosure of Invention
The invention aims to solve at least one technical problem in the prior art, and provides a display control device, a display control method and display equipment.
In order to achieve the above object, the present invention provides a display control apparatus comprising:
the detection module is used for detecting whether the display equipment is in a shutdown response state, and if so, generating a first control signal;
and the display control module is used for generating a black frame insertion signal according to the first control signal so as to control a display panel of the display equipment to display a picture with zero gray scale.
Optionally, the display control module is connected with a working voltage end; the working voltage end is connected with the power supply end of the display equipment to generate a voltage signal positively correlated with the voltage of the power supply end;
the detection module comprises:
the voltage detection submodule is used for generating corresponding detection voltage according to the voltage of the working voltage end, and the detection voltage is positively correlated with the voltage of the working voltage end;
the comparison submodule is used for comparing the detection voltage with a preset value and judging that the display equipment is in the shutdown response state when the detection voltage is smaller than or equal to the preset value; when the detection voltage is larger than the preset value, generating a second control signal;
the display control apparatus further includes: and the charge-discharge module is used for storing the voltage provided by the power supply end according to the second control signal and providing the voltage for the display control module according to the first control signal.
Optionally, the voltage detection sub-module includes: the detection circuit comprises a first resistor and a second resistor, wherein the first resistor and the second resistor are connected in series between the working voltage end and the reference voltage end, and the detection voltage is the voltage of a connection node of the first resistor and the second resistor.
Optionally, the charge and discharge module includes: the device comprises a control unit, a first switch unit, a second switch unit and a storage unit;
the first end of the first switch unit is connected with the power supply end, the second end of the first switch unit is connected with the first end of the storage unit, 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 a reference voltage end;
the first end of the second switch unit is connected with the third end of the storage unit, and the second end of the second switch unit is connected with the working voltage end;
the control unit is used for conducting the second end and the third end of the first switch unit, disconnecting the first end and the third end of the first switch unit and conducting the first end and the second end of the second switch unit according to the first control signal; and disconnecting the second end and the third end of the first switch unit, connecting the first end and the third end of the first switch unit, and disconnecting the first end and the second end of the second switch unit according to the second control signal.
Optionally, the storage unit includes a capacitor and a third resistor, two ends of the capacitor are respectively connected to the reference voltage terminal and the first terminal of the second switch unit, and two ends of the third resistor are respectively connected to the third terminal of the first switch unit and the first terminal of the second switch unit.
Optionally, the first switching unit comprises a single pole double throw switch.
Optionally, the reference voltage terminal is a ground terminal.
Correspondingly, the invention also provides display equipment which comprises a display panel and the display control device.
Accordingly, the present invention also provides a display control method using the display control apparatus, including:
and detecting whether the display equipment is in a shutdown response state by using the detection module, and if so, generating a black frame insertion signal by using the display control module so as to control a display panel of the display equipment to display a picture with zero gray scale.
Optionally, when the display control module is connected to an operating voltage terminal, which is connected to a power supply terminal of the display device,
the step of detecting whether the display device is in a power-off response state comprises:
generating a corresponding detection voltage according to the voltage of the working voltage end, wherein the detection voltage is positively correlated with the voltage of the working voltage end;
comparing the detection voltage with a preset value, and when the detection voltage is smaller than or equal to the preset value, judging that the display equipment is in the shutdown response state;
the display control method further includes:
when the detection voltage is larger than the preset value, storing the voltage provided by the power supply end by using a storage unit;
and when the detection voltage is smaller than or equal to the preset value, the storage unit is utilized to provide voltage for the working voltage end.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
fig. 1 is a schematic structural diagram of a display control apparatus according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a display control module according to a second embodiment of the present invention;
fig. 3 is a schematic structural diagram of a display control apparatus according to a second embodiment of the present invention;
fig. 4 is a flowchart illustrating a display control method using a display control apparatus according to a fourth embodiment of the present invention.
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.
In the liquid crystal display, a shift register provides scanning signals for grid lines of a display panel line by line so as to control pixels of the display panel to receive data signals line by line, and therefore the pixels are started line by line; and when the next row of pixels are displayed, the previous row of pixels keep the display state under the action of the storage capacitor. At the moment of shutdown, the charges stored in the pixel units cannot disappear instantaneously, thereby causing shutdown ghost.
In the prior art, the power-off afterimage is generally eliminated by an XAO function, that is, XAO voltage is detected by a Level shift chip (Level Shifter) during power-off, and when XAO voltage is reduced to a certain threshold, a low-Level voltage connected to a shift register is pulled up to a high-Level voltage to turn on a thin film transistor in each pixel unit, so that each pixel unit is discharged. However, in this method, when the pixel voltage is discharged, the shift register unit is actually charged, so that charge accumulation is easily generated in the shift register unit, which causes abnormal display of the display panel, and the service life of the display panel is also shortened to some extent.
In order to effectively eliminate shutdown afterimages without affecting normal display of a display panel and the service life of the display panel, an embodiment of the present invention provides a display control apparatus for use in a display device, where the display device includes a display panel. Fig. 1 is a schematic structural diagram of a display control device according to an embodiment of the present invention, and as shown in fig. 1, the display control device includes: a detection module 10 and a display control module 20.
The detection module 10 is configured to detect whether the display device is in a shutdown response state, and if so, the detection module 10 generates a first control signal. The shutdown response state refers to a state of the display device in a shutdown response stage, where the shutdown response stage is a period of time after the display device receives a shutdown instruction, and specifically, the shutdown response stage may be a stage in which a voltage of a power supply terminal of the display device is reduced from a working voltage to a preset threshold (where the preset threshold is greater than or equal to 0); in the power-off response phase, the charges in the pixel units in the display panel are not completely discharged.
The display control module 20 is configured to generate a black frame insertion signal according to the first control signal, so as to control a display panel of the display device to display a picture with a zero gray scale, that is, a black picture. The display control module 20 may include a timing control circuit (TCON) that generates a black frame insertion signal according to a first control signal, a gate driving circuit, and a source driving circuit; at this time, the gate driving circuit provides scanning signals for the display panel line by line according to the black frame insertion signal, and the source driving circuit provides data signals for each pixel unit so as to drive the gray scale of the pixel unit to reach 0.
In the first embodiment, when the display device is in the power-off response state, the display control module 20 controls the display panel to display the image with the gray scale of zero, so that the image seen by the user when the display device is powered off is a black image, and after the black image is displayed, even though charges still remain in the pixel units, the image remaining on the display panel is also a black image, so that the pixel units perform natural discharge while displaying the black image and after displaying the black image. Therefore, the invention can eliminate the shutdown afterimage without influencing the normal display of the display panel and the service life of the display panel.
Fig. 2 is a schematic structural diagram of a display control module according to a second embodiment of the present invention, and as shown in fig. 2, the display control module 20 is connected to a working voltage terminal DVDD, and the working voltage terminal DVDD is connected to a power supply terminal VIN of the display device to generate a voltage signal positively correlated to a voltage of the power supply terminal VIN. The supply terminal VIN may be connected to the working voltage terminal DVDD through a voltage dropping circuit or device, so that the voltage of the working voltage terminal DVDD is lower than that of the supply terminal. The detection module 10 may specifically determine whether the display device is in the shutdown response state by directly or indirectly detecting the voltage of the working voltage terminal DVDD.
Specifically, the detection module 10 includes: a voltage detection sub-module 11 and a comparison sub-module 12. The voltage detection submodule 11 is configured to generate a corresponding detection voltage according to a voltage of the working voltage terminal DVDD, where the detection voltage is positively correlated with the voltage of the working voltage terminal DVDD. The comparison submodule 12 is configured to compare the detection voltage with a preset value, and determine that the display device is in the shutdown response state when the detection voltage is less than or equal to the preset value; and generating a second control signal when the detection voltage is greater than the preset value. The preset value may be a minimum operating voltage of the display control module 20, for example, when the operating voltage of the display control module 20 is 3.3V ± 0.5V, the preset value is a corresponding detection voltage when the operating voltage reaches 2.8V.
In this case, after the power of the display device is cut off, the voltage of the power supply terminal VIN decreases, so that the voltage of the working voltage terminal DVDD decreases accordingly, and after the voltage of the working voltage terminal DVDD decreases to the minimum working voltage of the display control module 20, the display control module 20 cannot operate normally. For example, the operating voltage of the display control module 20 is 3.3V ± 0.5V, that is, the voltage of the operating voltage terminal DVDD is 3.3V during normal display, and when the voltage of the operating voltage terminal DVDD is reduced to 2.8V, the display control module 20 cannot operate. In an actual product, the time for the voltage of the power supply terminal VIN to decrease to 0V is short (for example, in a display product with 27FHD (i.e., 27 inches, resolution of 1920 × 1080) and 60Hz, the time for the voltage of the power supply terminal VIN to decrease to 0V is only about 50 ms), and the time for the voltage of the operating voltage terminal DVDD to decrease to 0V is consistent with the time for the voltage of the power supply terminal to decrease to 0V, so that the time for the display control module 20 to normally operate after the display device is turned off (i.e., after the power of the power supply terminal VIN is cut off) is shorter.
In order to ensure that the display control module 20 can at least drive the display panel to display a frame of image when the display device is turned off, as shown in fig. 2, the display control apparatus further includes a charging/discharging module 30, in addition to the detection module 10 and the display control module 20, for storing the voltage provided by the power supply terminal VIN according to the second control signal, and providing the voltage to the display control module 20 according to the first control signal.
Fig. 3 is a schematic structural diagram of a display control apparatus according to a second embodiment of the present invention, and as shown in fig. 3, the voltage detection sub-module 11 includes: the voltage detection circuit comprises a first resistor R1 and a second resistor R2, wherein the first resistor R1 and the second resistor R2 are connected in series between a working voltage terminal DVDD and a reference voltage terminal VSS, and the detection voltage is the voltage of a connection node of the first resistor R1 and the second resistor R2. Optionally, the reference voltage terminal VSS is a ground terminal.
At this time, the voltage V is detectedDetection ofThe relationship with the voltage Vdd of the operating voltage terminal DVDD is: vDetection of(r2/(r1+ r 2)). times.vdd; wherein R1 is the resistance of the first resistor R1; r2 is the resistance of the second resistor R2. In practical applications, the operating voltages corresponding to the display control modules in different batches of products may be different, so that different display control devices correspond to the same preset value by adjusting the resistances of the first resistor R1 and the second resistor R2 in different batches of display devices.
The charge and discharge module 30 specifically includes: a control unit 34, a first switching unit 31, a second switching unit 32 and a storage unit 33.
A first terminal of the first switching unit 31 is connected to the power supply terminal VIN, a second terminal of the first switching unit 31 is connected to a first terminal of the storage unit 33, and a third terminal of the first switching unit 31 is connected to a second terminal of the storage unit 33. A first terminal of the memory cell 33 is connected to a reference voltage terminal VSS. Wherein, the first switch unit 31 may be a single-pole double-throw switch; the storage unit 33 may be an RC charging and discharging structure, and specifically includes a capacitor C and a third resistor R3, two ends of the capacitor C are respectively connected to the reference voltage terminal VSS and the first end of the second switch unit 32, and two ends of the third resistor R3 are respectively connected to the third end of the first switch unit 31 and the first end of the second switch unit 32.
A first terminal of the second switching unit 32 is connected to the third terminal of the memory unit 33 (i.e., one terminal of the capacitor C), and a second terminal of the second switching unit 32 is connected to the operating voltage terminal DVDD. The second switching unit 32 may be a single pole single throw switch.
The control unit 34 is configured to disconnect the first terminal and the third terminal of the first switching unit 31, connect the second terminal and the third terminal of the first switching unit 31, and connect the first terminal and the second terminal of the second switching unit 32 according to the first control signal; and disconnecting the second terminal and the third terminal of the first switching unit 31, connecting the first terminal and the third terminal, and disconnecting the first terminal and the second terminal of the second switching unit 32 according to the second control signal.
Therefore, when the display device is performing normal display, the first terminal and the third terminal of the first switching unit 31 are turned on, the first terminal and the second terminal of the second switching unit 32 are turned off, and the power supply terminal VIN charges the storage unit 33; when the display device receives the shutdown instruction and the detection voltage is reduced to the preset value, the second terminal of the first switch unit 31 is conducted with the third terminal, and the first terminal of the second switch unit 32 is conducted with the second terminal, so that the storage unit 33 provides voltage for the working voltage terminal DVDD, and the display control module can still normally work after the voltage of the power supply terminal is reduced.
For the display device in the prior art, when the power supply terminal is lowered to 0, the pixel still displays the gray scale of the last frame under the storage effect of the storage capacitor in the pixel, so that after the display device receives the shutdown instruction, a certain residual image still remains, and the time of the residual image remains after the power supply terminal is lowered to 0, whereas the display control device in the second embodiment of the present invention can charge the storage unit 33 when the display device normally displays, and discharge the working voltage terminal DVDD of the display control module 20 when the display device is shutdown and the voltage of the working voltage terminal DVDD reaches the minimum working voltage of the display control module, so as to ensure that the display control module 20 can normally work when the display device is shutdown, and control the display panel to display black pictures, and the time for the voltage of the working voltage terminal DVDD to be lowered to the minimum working voltage of the display control module is very short, the human eyes can not observe the residual shadow in the period of time, so that the human eyes can see a black picture after the power-off, thereby eliminating the residual shadow during the power-off.
A third embodiment of the present invention provides a display device, including a display panel and the display control apparatus of the first or second embodiment. The display panel is a liquid crystal display panel. The detection module and the charging and discharging module of the display control apparatus may be integrated in a Power Management IC (PMIC) of the display device.
The display device may be: any product or component with a display function, such as electronic paper, a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, a navigator and the like.
The display control device can control the display panel to display black pictures when the display equipment is shut down, so that shutdown afterimages of the display equipment adopting the display control device can be eliminated, and the service life of the display equipment cannot be influenced.
Fig. 4 is a flowchart illustrating a display control method using a display control apparatus according to a fourth embodiment of the present invention, where as shown in fig. 4, the display control method includes:
and S1, detecting whether the display device is in a power-off response state by using the detection module, and if so, executing the step S2.
And S2, generating a black frame insertion signal by using the display control module to control a display panel of the display device to display a picture with zero gray scale.
As described above, the operation voltage terminal is connected to the power supply terminal of the display device, and in this case, the step S1 includes:
and S11, generating a corresponding detection voltage according to the voltage of the working voltage end, wherein the detection voltage is positively correlated with the voltage of the working voltage end. This step S11 may be performed using the voltage detection sub-module described above.
And S12, comparing the detected voltage with a preset value, and when the detected voltage is less than or equal to the preset value, judging that the display device is in a shutdown response state. This step S12 may be performed using the comparison submodule described above.
Further, when the determination result in the step S12 is that the detected voltage is greater than the preset value, the display control method further includes: s13, storing the voltage provided by the power supply terminal by using the storage unit; when the determination result in the step S12 is that the detected voltage is less than or equal to the preset value, the display control method further includes: and S14, supplying voltage to the working voltage terminal by using the storage unit to ensure that the display control module can drive the display panel to display at least one frame of picture when the display device is shut down.
The principle of the display control by the display control device is explained above, and the description thereof is omitted here.
It will be understood that the above embodiments are merely exemplary embodiments taken to illustrate the principles of the present invention, which is not limited thereto. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit and substance of the invention, and these modifications and improvements are also considered to be within the scope of the invention.
Claims (8)
1. A display control apparatus, characterized by comprising:
the detection module is used for detecting whether the display equipment is in a shutdown response state, and if so, generating a first control signal;
the display control module is used for generating a black frame insertion signal according to the first control signal so as to control a display panel of the display equipment to display a picture with zero gray scale;
the display control module is connected with the working voltage end; the working voltage end is connected with the power supply end of the display equipment to generate a voltage signal positively correlated with the voltage of the power supply end;
the detection module comprises:
the voltage detection submodule is used for generating corresponding detection voltage according to the voltage of the working voltage end, and the detection voltage is positively correlated with the voltage of the working voltage end;
the comparison submodule is used for comparing the detection voltage with a preset value and judging that the display equipment is in the shutdown response state when the detection voltage is smaller than or equal to the preset value; when the detection voltage is larger than the preset value, generating a second control signal;
the display control apparatus further includes: and the charge-discharge module is used for storing the voltage provided by the power supply end according to the second control signal and providing the voltage for the display control module according to the first control signal.
2. The display control apparatus according to claim 1, wherein the voltage detection sub-module includes: the detection circuit comprises a first resistor and a second resistor, wherein the first resistor and the second resistor are connected in series between the working voltage end and the reference voltage end, and the detection voltage is the voltage of a connection node of the first resistor and the second resistor.
3. The display control device according to claim 1, wherein the charge-discharge module comprises: the device comprises a control unit, a first switch unit, a second switch unit and a storage unit;
the first end of the first switch unit is connected with the power supply end, the second end of the first switch unit is connected with the first end of the storage unit, 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 a reference voltage end;
the first end of the second switch unit is connected with the third end of the storage unit, and the second end of the second switch unit is connected with the working voltage end;
the control unit is used for conducting the second end and the third end of the first switch unit, disconnecting the first end and the third end of the first switch unit and conducting the first end and the second end of the second switch unit according to the first control signal; and disconnecting the second end and the third end of the first switch unit, connecting the first end and the third end of the first switch unit, and disconnecting the first end and the second end of the second switch unit according to the second control signal.
4. The apparatus according to claim 3, wherein the storage unit comprises a capacitor and a third resistor, two ends of the capacitor are respectively connected to the reference voltage terminal and the first terminal of the second switch unit, and two ends of the third resistor are respectively connected to the third terminal of the first switch unit and the first terminal of the second switch unit.
5. The display control device according to claim 3, wherein the first switch unit includes a single-pole double-throw switch.
6. The display control device according to claim 3, wherein the reference voltage terminal is a ground terminal.
7. A display device characterized by comprising a display panel and the display control apparatus of any one of claims 1 to 6.
8. A display control method using the display control apparatus according to any one of claims 1 to 6, characterized by comprising:
detecting whether the display equipment is in a shutdown response state or not by using the detection module, if so, generating a black frame insertion signal by using the display control module so as to control a display panel of the display equipment to display a picture with zero gray scale;
when the display control module is connected with the working voltage end, and the working voltage end is connected with the power supply end of the display device, the step of detecting whether the display device is in a shutdown response state comprises the following steps:
generating a corresponding detection voltage according to the voltage of the working voltage end, wherein the detection voltage is positively correlated with the voltage of the working voltage end;
comparing the detection voltage with a preset value, and when the detection voltage is smaller than or equal to the preset value, judging that the display equipment is in the shutdown response state;
the display control method further includes:
when the detection voltage is larger than the preset value, storing the voltage provided by the power supply end by using a storage unit;
and when the detection voltage is smaller than or equal to the preset value, the storage unit is utilized to provide voltage for the working voltage end.
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| WO2021138778A1 (en) * | 2020-01-06 | 2021-07-15 | 京东方科技集团股份有限公司 | Display panel control method and apparatus |
| CN115552509A (en) * | 2021-04-25 | 2022-12-30 | 京东方科技集团股份有限公司 | Display device and control method thereof |
| CN113314084B (en) * | 2021-05-31 | 2022-03-22 | 惠科股份有限公司 | Display panel driving method and device and display panel |
| 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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