CN110767195B - Display device and driving method thereof - Google Patents
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- CN110767195B CN110767195B CN201911143523.0A CN201911143523A CN110767195B CN 110767195 B CN110767195 B CN 110767195B CN 201911143523 A CN201911143523 A CN 201911143523A CN 110767195 B CN110767195 B CN 110767195B
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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
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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
- G09G3/006—Electronic inspection or testing of displays and display drivers, e.g. of LED or LCD displays
Abstract
The present disclosure relates to a display device and a driving method thereof, the display device including a display driving circuit, the display driving circuit including: the detection circuit is used for detecting the power supply current input into the display device; the control circuit is connected with the detection circuit and used for determining the power consumption of the display device according to the power supply current of the display device and determining the on-state voltage of the display device according to the power consumption of the display device. The on-state voltage is adjusted in real time according to the power consumption, the problem that the charging rate of the display device is insufficient when the display device is high in power consumption is solved, the charging rate of the display device is improved, and the display quality is improved.
Description
Technical Field
The disclosure relates to the technical field of display, and particularly to a display device and a driving method thereof.
Background
With the development and progress of the technology, the application of the liquid crystal display device is more and more extensive. The application scenes of the liquid crystal display devices are also in a diversified trend. Different application environments may cause different power consumption of the display device. For example, the working temperature range of the vehicle-mounted display device is wide, and is usually-40 ℃ to 85 ℃. In a low temperature environment, power consumption of the display device increases, which may cause a problem that the display device is insufficiently charged.
It is to be noted that the information disclosed in the above background section is only for enhancement of understanding of the background of the present disclosure, and thus may include information that does not constitute prior art known to those of ordinary skill in the art.
Disclosure of Invention
The present disclosure is directed to a display device and a driving method thereof, so as to solve the problem of insufficient charging of the display device at least to a certain extent.
According to a first aspect of the present disclosure, there is provided a display device, the display device driving circuit, the driving circuit comprising:
a detection circuit for detecting a power supply current input to the display device;
the control circuit is connected with the detection circuit and used for determining the power consumption of the display device according to the power supply current of the display device and determining the on-state voltage of the display device according to the power consumption of the display device, wherein the on-state voltage is the conducting voltage in a scanning signal input to a grid electrode of a pixel circuit of the display device.
According to an embodiment of the present disclosure, the power consumption of the display device includes a first power consumption and a second power consumption, the second power consumption is greater than the first power consumption, the first power consumption corresponds to a first on-state voltage, the second power consumption corresponds to a second on-state voltage, and an absolute value of the second on-state voltage is greater than or equal to an absolute value of the first on-state voltage.
According to an embodiment of the present disclosure, the control circuit is provided with a first mapping relationship, where the first mapping relationship is a mapping relationship between power consumption of the display device and an on-state voltage of the display device, and the control circuit determines the on-state voltage of the display device according to the power consumption of the display device by using the first mapping relationship.
According to an embodiment of the present disclosure, the detection circuit includes:
the current detection resistor has a first end connected with the power supply and a second end connected with the power supply input end of the display device;
and the current detection chip is respectively connected with the first end and the second end of the current detection resistor and the control circuit, and outputs a first voltage signal according to the voltages at the two ends of the current detection resistor.
According to an embodiment of the present disclosure, the detection circuit further includes:
and the input end of the voltage sampling sub-circuit is connected with the output end of the current detection chip and the logic voltage signal end, the clock end is connected with the control circuit, the output end of the voltage sampling sub-circuit is connected with the control circuit, the control circuit sends a clock signal to the voltage sampling sub-circuit, and the voltage sampling sub-circuit responds to the clock signal and outputs a second voltage signal.
According to an embodiment of the present disclosure, the detection circuit further includes:
and the digital-to-analog conversion sub-circuit is connected between the output end of the voltage sampling sub-circuit and the control circuit and is used for converting the second voltage signal into an analog signal and transmitting the analog signal to the control circuit.
According to an embodiment of the present disclosure, the streaming chip includes:
and the operational amplifier is respectively connected with the first end and the second end of the current detection resistor, the current detection logic signal end and the control circuit and is used for amplifying the voltages at the two ends of the current detection resistor and transmitting the voltages to the input end of the voltage sampling sub-circuit.
According to an embodiment of the present disclosure, the control circuit includes:
and the time schedule controller is connected with the detection circuit and used for determining the power consumption of the display device according to the power supply current of the display device, determining the on-state voltage of the display device according to the power consumption of the display device and sending a scanning signal to the display device according to the on-state voltage.
According to a second aspect of the present disclosure, there is provided a driving method of a display device, the method including:
acquiring a power supply current input into the display device;
determining power consumption of the display device according to the power supply current input to the display device;
determining the on-state voltage of the display device according to the power consumption of the display device;
and outputting a scanning signal to the display device, wherein the conducting voltage of the scanning signal is the on-state voltage.
According to an embodiment of the present disclosure, the determining the on-state voltage of the display device according to the power consumption of the display device includes:
and determining the on-state voltage of the display device according to the power consumption of the display device and a first mapping relation, wherein the first mapping relation is the mapping relation between the power consumption of the display device and the on-state voltage.
According to the display device provided by the embodiment of the disclosure, the detection circuit detects the power supply current input into the display device, the control circuit determines the power consumption of the display device according to the input current, determines the on-state voltage of the display device according to the power consumption of the display device, and drives the display device to display through the on-state voltage, so that the on-state voltage is adjusted in real time according to the power consumption, and the problem that the charging rate of the display device is insufficient when the display device is high in power consumption is solved.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.
Drawings
The above and other features and advantages of the present disclosure will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings.
FIG. 1 is a circuit diagram of a display device according to the related art;
fig. 2 is a schematic block diagram of a first display driving circuit provided in an exemplary embodiment of the present disclosure;
fig. 3 is a schematic diagram of a pixel driving circuit according to an exemplary embodiment of the disclosure;
fig. 4 is a schematic block diagram of a second display driving circuit provided in an exemplary embodiment of the present disclosure;
fig. 5 is a schematic block diagram of a third display driving circuit provided in an exemplary embodiment of the present disclosure;
fig. 6 is a schematic block diagram of a fourth display driving circuit provided in an exemplary embodiment of the present disclosure;
fig. 7 is a flowchart of a first display driving method according to an exemplary embodiment of the disclosure.
In the figure:
10. a power source; 110. a step-up/step-down circuit; 210. a detection circuit; 211. current detecting resistance; 212. a current detection chip; 213. a voltage sampling sub-circuit; 214. a digital-to-analog conversion sub-circuit; 220. a control circuit; 20. a display device; 300. a display panel.
Detailed Description
Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The same reference numerals denote the same or similar parts in the drawings, and thus, a repetitive description thereof will be omitted.
Furthermore, the described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to give a thorough understanding of embodiments of the disclosure. One skilled in the relevant art will recognize, however, that the embodiments of the disclosure can be practiced without one or more of the specific details, or with other methods, components, materials, devices, steps, and so forth. In other instances, well-known structures, methods, devices, implementations, materials, or operations are not shown or described in detail to avoid obscuring aspects of the disclosure.
The block diagrams shown in the figures are functional entities only and do not necessarily correspond to physically separate entities. That is, these functional entities may be implemented in the form of software, or in one or more software-hardened modules, or in different networks and/or processor devices and/or microcontroller devices.
Fig. 1 is a block diagram of a display device provided in the related art, in which, as shown in fig. 1, a power supply 10 supplies power to the display device, and a rectifying and filtering circuit 110 is provided in the power supply 10 to convert an ac signal VAC of the power supply 10 into a dc signal VDC, which is a power supply current to the display device, and input the dc signal VDC to the display device 20. For example, the AC signal VAC may be 220V AC and the DC signal VDC may be 3.3V/5V/12V DC. The power current is input to the display device and then transmitted to the control circuit 220 and the step-up/step-down circuit 230, respectively. The control circuit 220 outputs the on-voltage VGH and the off-voltage VGL to the display panel 300. The voltage boosting/reducing circuit 230 supplies the first power signal VDD and the second power signal VCOM to the display panel.
First, an exemplary embodiment of the present disclosure provides a display device including a display driving circuit, as shown in fig. 2, the display driving circuit including: a detection circuit 210 and a control circuit 220, wherein the detection circuit 210 is used for detecting the power supply current input into the display device 20. The control circuit 220 is connected to the detection circuit 210, and the control circuit 220 is configured to determine power consumption of the display device according to the power supply current of the display device 20, and determine an on-state voltage VGH of the display device according to the power consumption of the display device, where the on-state voltage VGH is an on-state voltage of a scan signal input to a gate of a pixel circuit of the display device 20.
The display device provided by the embodiment of the disclosure detects the power current input into the display device through the detection circuit 210, the control circuit 220 determines the power consumption of the display device according to the input power current, determines the on-state voltage VGH of the display device according to the power consumption of the display device, and drives the gate of the display device through the on-state voltage VGH, so that the on-state voltage VGH is adjusted in real time according to the power consumption, the problem of insufficient charging rate of the display device when the display device is high in power consumption is solved, the charging rate of the display device is improved, and the display quality is improved.
The display device in the embodiment of the present disclosure may be a liquid crystal display device, and the on-state voltage VGH of the display device refers to a turn-on voltage of a gate scan signal of the display device, that is, a voltage for turning on a transistor by a scan signal input to a pixel driving circuit. The display device comprises pixel driving circuits distributed in an array.
For example, as shown in fig. 3, the pixel driving circuit may include a driving transistor DT, a first transistor T1, and a storage capacitor Cst. A first terminal of the driving transistor DT is connected to the first power source VDD, and a second terminal of the driving transistor DT is connected to the pixel electrode. A first end of the first transistor T1 is connected to a data signal Vdata end, the data signal Vdata end transmits a data signal Vdata to the first transistor T1, a second end of the first transistor T1 is connected to the control end of the driving transistor DT, the control end of the first transistor T1 is connected to the control circuit 220, the control circuit 220 transmits a scan signal to the control end of the first transistor T1, and an operating voltage of the scan signal is the on-state voltage VGH. The first terminal of the storage capacitor Cst is connected to a first power supply, the second terminal of the storage capacitor Cst is connected to the control terminal of the driving transistor DT, and the common electrode is connected to a second power supply VCOM.
Of course, in practical applications, the pixel driving circuit may further include other components, and the disclosure is not limited thereto. The on-state voltage VGH signal described in the embodiments of the present disclosure refers to a conducting voltage of a gate signal of the display device, that is, the on-state voltage VGH for conducting the first transistor in the pixel driving circuit. The scan signal is output to the gate of the first transistor of the pixel driving circuit by the timing controller in the control circuit 220.
It should be noted that, in the embodiment of the present disclosure, the display driving is described by taking a liquid crystal display device as an example, but in practical applications, the display device may also be other types of display devices, such as an OLED display device, and the embodiment of the present disclosure is not limited to this specifically.
The following will explain each part of the display device provided by the present disclosure in detail:
the detection circuit 210 includes a current detection sub-circuit, which is disposed between the power input terminal of the display device 20 and the power supply 10, and is configured to detect a power current input to the display device 20. Since the voltage of the power supply 10 is a constant value, the voltage applied to the display device 20 is a constant value, and the voltage applied to the display device 20 is a known value for the determined display device. After the power supply current input into the display device is detected and acquired, the power consumption of the display device can be calculated and acquired. The power supply current input to the display surface is the total current input to the display device by the external power supply.
As shown in fig. 4, the current detection sub-circuit includes a current detection resistor 211 and a current detection chip 212, a first end of the current detection resistor 211 is connected to the power supply, and a second end of the current detection resistor 211 is connected to a signal input end of the display device; the current detecting chip 212 is respectively connected to the first end and the second end of the current detecting resistor 211 and the control circuit 220, and the current detecting chip 212 outputs a first voltage signal according to the voltage at the two ends of the current detecting resistor 211.
The current detecting resistor 211 is connected in series between the power supply 10 and the power supply input terminal of the display device 20, and the power supply 10 is used for supplying power to the display device 20. The resistance value of the current detection resistor 211 is R, and if the current flowing through the current detection resistor 211 is I, the voltage value across the current detection resistor 211 is VR＝I×R。
The current detection chip 212 comprises a first input end R +, a second input end R-, a logic input end and an output end, wherein the first input end of the current detection chip 212 is connected with the first end of the current detection resistor 211, and the second input end of the current detection chip 212 is connected with the second end of the current detection resistor 211. The logic input end of the current detecting chip 212 inputs the logic voltage VDD1, and the output end of the current detecting chip 212 is connected with the control circuit 220. The amplification factor of the current detecting chip 212 is G, and the first voltage signal V output by the output end of the current detecting chip 2121＝VRG is multiplied by. Therefore, the current I flowing through the current detecting resistor 211 is V1/(G × R), i.e. the supply current to the display device is V1/(G.times.R). Supply voltage of VINThen, the power consumption of the display device is:
the current detecting chip 212 may include an operational amplifier, and the operational amplifier may include a first input terminal, a second input terminal, a logic input terminal, and an output terminal, where the first input terminal of the operational amplifier is connected to the first terminal of the current detecting resistor 211, and the second input terminal of the operational amplifier is connected to the second terminal of the current detecting resistor 211. The logic input end of the operational amplifier inputs logic voltage, and the output end of the operational amplifier is connected with the control circuit 220.
Further, as shown in fig. 5, the detection circuit 210 may further include a voltage sampling sub-circuit 213, and the voltage sampling sub-circuit 213 has an input terminal, a clock terminal, a ground terminal, and an output terminal. The input end of the voltage sampling sub-circuit 213 is connected to the output end of the current detecting chip 212 and the logic voltage signal end, the clock end of the voltage sampling sub-circuit 213 is connected to the control circuit 220, and the output end of the voltage sampling sub-circuit 213 is connected to the control circuit 220. The control circuit 220 sends a clock signal CLK to the voltage sampling sub-circuit 213, and the voltage sampling sub-circuit 213 outputs a second voltage signal V2 in response to the clock signal CLK.
The input terminal of the voltage sampling sub-circuit 213 may include a first input terminal and a second input terminal, the first input terminal of the voltage sampling circuit is connected to the output terminal of the current detecting chip 212, and the second input terminal of the voltage sampling circuit is connected to the logic voltage signal for inputting the logic voltage signal VF。
The voltage sampling sub-circuit 213 may include a voltage sampling chip, since the display device is scanned line by the timing controller during the actual driving of the display device, that is, the scan signal is supplied line by line. Therefore, the power supply current input into the display device can be acquired according to the corresponding time sequence of the scanning signals, so that the on-state voltage VGH of each scanning signal is ensured to be compensated.
The first input terminal of the voltage sampling sub-circuit 213 inputs the first voltage signal V outputted by the current detecting sub-circuit1The first input terminal of the voltage sampling sub-circuit 213 inputs the logic voltage VF，VFThe number of bits of the voltage sampling sub-circuit 213 is D for the full scale voltage of the voltage sampling sub-circuit 213. Second voltage signal V output by voltage sampling chipAD：
Further, as shown in fig. 6, since the voltage signal output by the voltage sampling sub-circuit 213 is a digital signal, the detection circuit 210 may further include a digital-to-analog conversion sub-circuit 214, and the digital-to-analog conversion sub-circuit 214 is connected between the output end of the voltage sampling sub-circuit 213 and the control circuit 220, and is configured to convert the second voltage signal into an analog signal and transmit the analog signal to the control circuit 220. Second voltage signal VADConverted to an analog signal V by digital-to-analog conversion subcircuit 214DA. In this case, the power supply current I input to the display device can be calculated by the following formula:
the power consumption of the display device is W:
wherein, VINFor inputting voltage values, V, to the display deviceDAVoltage value, V, transmitted to control circuit 220 for digital-to-analog conversion sub-circuit 214FIs the full scale voltage value of the voltage sampling sub-circuit 213, D is the number of bits of the voltage sampling sub-circuit 213, G is the amplification factor of the current detection sub-circuit, and R is the resistance of the current detection resistor 211.
The control circuit 220 may include a Timing Controller (TCON) connected to the detection circuit 210, and configured to determine power consumption of the display device according to a power supply current of the display device, and determine an on-state voltage VGH of the display device according to the power consumption of the display device.
The timing controller may be connected to the voltage sampling sub-circuit 213 and the digital-to-analog conversion sub-circuit 214. The timing controller sends a clock signal to the voltage sampling sub-circuit 213, and the voltage sampling sub-circuit 213 performs voltage sampling in response to the clock signal. The timing controller receives the analog voltage signal output by the digital-to-analog conversion sub-circuit 214, calculates the power current input to the display device according to the analog voltage signal, and calculates the power consumption of the display device according to the power voltage and the input current.
The power consumption of the display device comprises first power consumption and second power consumption, wherein the second power consumption is larger than the first power consumption, the first power consumption corresponds to a first on-state voltage, the second power consumption corresponds to a second on-state voltage, and the absolute value of the second on-state voltage is larger than or equal to the absolute value of the first on-state voltage.
When the transistor in the pixel circuit of the display device is an N-type transistor, the on-state voltage VGH is at a high level, and when the power consumption of the display device 20 increases, the line loss of the on-state voltage VGH and the like may increase, which may cause the voltage value of the on-state voltage VGH loaded on the gate of the transistor to decrease, thereby affecting the opening of the transistor, and causing the charging of the energy storage capacitor to be insufficient. When the power consumption increase value of the display device 20 is smaller than the preset threshold, the influence of the power consumption increase on the on-state voltage VGH is small, the on-state voltage VGH may not be adjusted, and when the power consumption increase value of the display device 20 is greater than or equal to the preset threshold, the absolute value of the on-state voltage VGH is increased.
When the transistors in the pixel circuit of the display device 20 are P-type transistors, the on-state voltage VGH is at a low level, and when the power consumption of the display device 20 increases, the line loss of the on-state voltage VGH and the like may increase, which may cause the absolute value of the on-state voltage VGH loaded on the gate of the transistor to decrease, thereby affecting the opening of the transistor, and causing insufficient charging of the energy storage capacitor, so when the second power consumption is greater than the first power consumption, the absolute value of the second on-state voltage output by the timing controller is greater than or equal to the absolute value of the first on-state voltage, and it may be ensured that the voltage value loaded on the gate of the transistor meets the standard on-state voltage VGH. When the power consumption increase value of the display device 20 is smaller than the preset threshold, the influence of the power consumption increase on the on-state voltage VGH is small, the on-state voltage VGH may not be adjusted, and when the power consumption increase value of the display device 20 is greater than or equal to the preset threshold, the absolute value of the on-state voltage VGH is increased.
It should be noted that the first and second mentioned above are not limited to the number of power consumption and on-state voltage, but are only used for distinguishing different power consumption and on-state voltage. That is, to illustrate that the absolute value of the on-state voltage of the display device does not decrease when the power consumption of the display device increases.
The time schedule controller is provided with a voltage conversion circuit, and when the power consumption of the display device is increased, the voltage value of the on-state voltage is increased through a voltage boosting circuit in the voltage conversion circuit. When the power consumption of the display device is reduced, the voltage value of the on-state voltage is reduced by the voltage reduction circuit in the voltage conversion circuit.
The control circuit 220 is provided with a first mapping relationship, and in a possible embodiment of the present disclosure, the first mapping relationship is a mapping relationship between the power consumption of the display device and the on-state voltage VGH of the display device. The control circuit determines the on-state voltage of the display device according to the power consumption of the display device by using the first mapping relation.
Wherein in the first mapping relationship, an absolute value of an on-state voltage of the display device increases or does not change with an increase in power consumption of the display device.
For example, the first mapping relationship may be a table stored in the timing controller, and the power consumption interval of the display device may be divided into a plurality of cell intervals, and the on-state voltage VGH may be compensated in each cell interval, and the power consumption interval may be obtained through experiments or experience. For example, the correspondence relationship between the power consumption of the display device and the on-state voltage VGH of the scan signal input to the pixel circuit can be as shown in table 1.
TABLE 1
| Power consumption of display device | On-state voltage VGH |
| 0～W1 | VGH1 |
| W1～W2 | VGH2 |
| W2～W3 | VGH3 |
| W3～W4 | VGH4 |
In Table 1, W1< W2< W3< W4, | VGH1 | VGH2 | VGH3 | VGH4 |.
And after the time sequence controller calculates and determines the power consumption of the display device, selecting and outputting the corresponding on-state voltage VGH to a grid driving end of the display device according to the interval where the power consumption of the display device is positioned. Of course, in practical applications, the first mapping relationship may also be stored in the timing controller in other forms, for example, the first mapping relationship may be a function of the on-state voltage VGH with respect to the power consumption of the display device.
In another possible implementation manner of the embodiment of the present disclosure, the first mapping relationship may include a mapping relationship between power consumption of the display device and an on-state voltage compensation value. On the basis, the on-state voltage VGH transmitted to the display device by the time schedule controller is the sum of the standard on-state voltage VGH and the on-state voltage compensation value.
The first mapping relationship may be a table stored in the timing controller, and the power consumption interval of the display device may be divided into a plurality of cell intervals, and the on-state voltage VGH may be compensated for in each cell interval. For example, the correspondence between the power consumption of the display device and the on-state voltage compensation value may be as shown in table 2.
TABLE 2
| Power consumption of display device | On-state voltage compensation value |
| 0～W1 | BC1 |
| W1～W2 | BC2 |
| W2～W3 | BC3 |
| W3～W4 | BC4 |
After the time sequence controller calculates and determines the power consumption of the display device, the corresponding on-state voltage compensation value is selected according to the interval where the power consumption of the display device is located, the on-state voltage compensation value is added with the standard value of the on-state voltage VGH, the on-state voltage VGH needing to be input into the display device is determined, and the on-state voltage VGH is transmitted to a grid driving end of the display device. Of course, in practical applications, the first mapping relationship may also be stored in the timing controller in other forms, for example, the first mapping relationship may be a function of the on-state voltage compensation value with respect to the power consumption of the display device.
The display device provided by the embodiment of the disclosure, the power current input into the display device is detected by the detection circuit 210, the control circuit 220 determines the power consumption of the display device according to the power current input into the display device, and determines the on-state voltage VGH of the display device according to the power consumption of the display device, the gate of the display device is driven by the on-state voltage VGH, the on-state voltage VGH is adjusted in real time according to the power consumption, the problem that the charging rate of the display device is insufficient when the display device is high in power consumption is solved, the display device is prevented from being insufficiently charged in application environments such as low temperature, the environmental adaptability and the charging rate of the display device are improved, and the display quality is further improved.
The embodiment of the present disclosure further provides a driving method of a display device, as shown in fig. 7, the method includes the following steps:
in step S710, a power supply current input to the display device is acquired.
Step S720, determining power consumption of the display device according to the power current input to the display device.
Step S730, determining an on-state voltage VGH of the display device according to the power consumption of the display device.
Step S740 is to output a scan signal to the display device, where the on voltage of the scan signal is the on voltage VGH.
According to the driving method of the display device provided by the embodiment of the disclosure, the detection circuit 210 detects the power supply current input into the display device, the control circuit 220 determines the power consumption of the display device according to the power supply current input into the display device, determines the on-state voltage VGH of the display device according to the power consumption of the display device, and drives the gate of the display device through the on-state voltage VGH, so that the on-state voltage VGH is adjusted in real time according to the power consumption, the problem that the charging rate of the display device is insufficient when the power consumption of the display device is high is solved, the display device is prevented from being insufficiently charged in application environments such as low temperature, the charging rate and the environment adaptability of the display device are improved, and the display quality is further improved.
The following will describe in detail the steps of the display driving method provided by the embodiment of the present disclosure:
in step S710, a power supply current input to the display device may be acquired.
The power current input to the display device can be obtained by the detection circuit 210 and transmitted to the control circuit 220. The detection circuit 210 performs voltage sampling in response to the clock signal output from the control circuit 220, thereby obtaining a power current input to the display device. The current detecting resistor 211 is connected in series between a power supply and the display device, and the power supply is used for supplying power to the display device. The resistance value of the current detection resistor 211 is R, and if the current flowing through the current detection resistor 211 is I, the voltage value across the current detection resistor 211 is VR＝I×R。
The first input terminal of the voltage sampling sub-circuit 213 inputs the first voltage signal V outputted by the current detecting sub-circuit1The first input terminal of the voltage sampling sub-circuit 213 inputs the logic voltage VF，VFThe number of bits of the voltage sampling sub-circuit 213 is D for the full scale voltage of the voltage sampling sub-circuit 213. Second voltage signal V output by voltage sampling chipAD：
In step S720, power consumption of the display apparatus may be determined according to a power current input to the display apparatus.
Wherein, the step S720 may be implemented by determining power consumption of the display apparatus according to the power current and the power voltage input to the display apparatus.
The power supply current input to the display device can be calculated by the following formula, and the power supply current I is input to the display device:
the power consumption of the display device is W:
wherein, VINFor inputting voltage values (i.e. supply voltage values), V, to the display deviceDAVoltage value, V, transmitted to control circuit 220 for digital-to-analog conversion sub-circuit 214FIs the full scale voltage value of the voltage sampling sub-circuit 213, D is the number of bits of the voltage sampling sub-circuit 213, G is the amplification factor of the current detection sub-circuit, and R is the resistance of the current detection resistor 211.
In step S730, the on-state voltage VGH of the display device may be determined according to the power consumption of the display device.
Step S730 may be implemented by determining the on-state voltage VGH of the display device according to the power consumption of the display device and a first mapping relationship, where the first mapping relationship is a mapping relationship between the power consumption of the display device and the on-state voltage VGH.
In a possible embodiment of the present disclosure, the first mapping relationship is a mapping relationship between power consumption of the display device and an on-state voltage VGH of the display device.
The first mapping relationship may be a table stored in the timing controller, and the power consumption interval of the display device may be divided into a plurality of cell intervals, and the on-state voltage VGH may be compensated for in each cell interval. For example, the correspondence relationship between the power consumption of the display device and the on voltage VGH of the scan signal input to the pixel circuit may be as shown in table 1.
And after the time sequence controller calculates and determines the power consumption of the display device, selecting and outputting the corresponding on-state voltage VGH to a grid driving end of the display device according to the interval where the power consumption of the display device is positioned. Of course, in practical applications, the first mapping relationship may also be stored in the timing controller in other forms, for example, the first mapping relationship may be a function of the on-state voltage VGH with respect to the power consumption of the display device.
In another possible implementation manner of the embodiment of the present disclosure, the first mapping relationship may include a mapping relationship between power consumption of the display device and an on-state voltage compensation value. On the basis, the on-state voltage VGH transmitted to the display device by the time schedule controller is the sum of the standard on-state voltage VGH and the on-state voltage compensation value.
The first mapping relationship may be a table stored in the timing controller, and the power consumption interval of the display device may be divided into a plurality of cell intervals, and the on-state voltage VGH may be compensated for in each cell interval. For example, the correspondence between the power consumption of the display device and the on-state voltage compensation value may be as shown in table 2.
After the time sequence controller calculates and determines the power consumption of the display device, the corresponding on-state voltage compensation value is selected according to the interval where the power consumption of the display device is located, the on-state voltage compensation value and the standard value of the on-state voltage VGH are added, the on-state voltage VGH needing to be input into the display device is determined, and the on-state voltage VGH is transmitted to a grid driving end of the display device. Of course, in practical applications, the first mapping relationship may also be stored in the timing controller in other forms, for example, the first mapping relationship may be a function of the on-state voltage compensation value with respect to the power consumption of the display device.
According to the driving method of the display device provided by the embodiment of the disclosure, the detection circuit 210 detects the power supply current input into the display device, the control circuit 220 determines the power consumption of the display device according to the input power supply current, determines the on-state voltage VGH of the display device according to the power consumption of the display device, and drives the gate of the display device through the on-state voltage VGH, so that the on-state voltage VGH is adjusted in real time according to the power consumption, the problem of insufficient charging rate of the display device when the display device is high in power consumption is solved, the charging rate of the display device is improved, and the display quality is further improved.
It should be noted that although the steps of the methods of the present disclosure are depicted in the drawings in a particular order, this does not require or imply that the steps must be performed in this particular order or that all of the depicted steps must be performed to achieve desirable results. Additionally or alternatively, certain steps may be omitted, multiple steps combined into one step execution, and/or one step broken down into multiple step executions, etc.
The display device provided by the embodiment of the disclosure detects the power current input into the display device through the detection circuit 210, the control circuit 220 determines the power consumption of the display device according to the input current, determines the on-state voltage VGH of the display device according to the power consumption of the display device, and drives the gate of the display device through the on-state voltage VGH, so that the on-state voltage VGH is adjusted in real time according to the power consumption, the problem of insufficient charging rate of the display device when the display device is high in power consumption is solved, the charging rate of the display device is improved, and the display quality is improved. The display device may include any product or component with a display function, such as a mobile phone, a tablet computer, a television, a notebook computer, a digital photo frame, and a navigator.
As will be appreciated by one skilled in the art, aspects of the present invention may be embodied as a system, method or program product. Thus, various aspects of the invention may be embodied in the form of: an entirely hardware embodiment, an entirely software embodiment (including firmware, microcode, etc.) or an embodiment combining hardware and software aspects that may all generally be referred to herein as a "circuit," module "or" system.
Furthermore, the above-described figures are merely schematic illustrations of processes involved in methods according to exemplary embodiments of the invention, and are not intended to be limiting. It will be readily understood that the processes shown in the above figures are not intended to indicate or limit the chronological order of the processes. In addition, it is also readily understood that these processes may be performed synchronously or asynchronously, e.g., in multiple modules.
Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This application is intended to cover any variations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.
It will be understood that the present disclosure is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is to be limited only by the terms of the appended claims.
Claims (8)
1. A display device, comprising a display driving circuit, the display driving circuit comprising:
the detection circuit is used for detecting a power supply current input into the display device, wherein the power supply current input into a display surface is total current input to the display device by an external power supply, the detection circuit comprises a current detection resistor and a current detection chip, a first end of the current detection resistor is connected with the power supply, a second end of the current detection resistor is connected with a power supply input end of the display device, the current detection chip is respectively connected with a first end and a second end of the current detection resistor, and the current detection chip outputs a first voltage signal according to voltages at two ends of the current detection resistor;
the control circuit is connected with the detection circuit and is used for determining the power supply current of the display device according to the resistance value of the current detection resistor and the first voltage signal, determining power consumption of the display device according to the power supply current of the display device, determining on-state voltage of the display device according to the power consumption of the display device, the on-state voltage is the conducting voltage of a scanning signal input to the grid electrode of the pixel circuit of the display device, wherein the control circuit is provided with a first mapping relation, the first mapping relation is the mapping relation between the power consumption of the display device and the on-state voltage of the display device, the control circuit determines an on-state voltage of the display device according to the power consumption of the display device by using the first mapping relation, in the first mapping relationship, an absolute value of an on-state voltage of the display device increases with an increase in power consumption of the display device.
2. The display device according to claim 1, wherein the power consumption of the display device includes a first power consumption and a second power consumption, the second power consumption is larger than the first power consumption, the first power consumption corresponds to a first on-state voltage, the second power consumption corresponds to a second on-state voltage, and an absolute value of the second on-state voltage is equal to or larger than an absolute value of the first on-state voltage.
3. The display device of claim 1, wherein the detection circuit further comprises:
and the input end of the voltage sampling sub-circuit is connected with the output end of the current detection chip and the logic voltage signal end, the clock end is connected with the control circuit, the output end of the voltage sampling sub-circuit is connected with the control circuit, the control circuit sends a clock signal to the voltage sampling sub-circuit, and the voltage sampling sub-circuit responds to the clock signal and outputs a second voltage signal.
4. The display device of claim 3, wherein the detection circuit further comprises:
and the digital-to-analog conversion sub-circuit is connected between the output end of the voltage sampling sub-circuit and the control circuit and is used for converting the second voltage signal into an analog signal and transmitting the analog signal to the control circuit.
5. The display device of claim 4, wherein the current detection chip comprises:
and the operational amplifier is respectively connected with the first end and the second end of the current detection resistor, the current detection logic signal end and the control circuit and is used for amplifying the voltages at the two ends of the current detection resistor and transmitting the voltages to the input end of the voltage sampling sub-circuit.
6. The display device according to claim 1, wherein the control circuit comprises:
and the time schedule controller is connected with the detection circuit and used for determining the power consumption of the display device according to the power supply current of the display device, determining the on-state voltage of the display device according to the power consumption of the display device and sending a scanning signal to the display device according to the on-state voltage.
7. A method of driving a display device, for use in a display device as claimed in any one of claims 1 to 6, the method comprising:
acquiring a power supply current input into the display device;
determining power consumption of the display device according to the power supply current input to the display device;
determining the on-state voltage of the display device according to the power consumption of the display device;
and inputting a scanning signal to the display device, wherein the conducting voltage of the scanning signal is the on-state voltage.
8. The method for driving a display device according to claim 7, wherein the determining the on-state voltage of the display device according to the power consumption of the display device comprises:
and determining the on-state voltage of the display device according to the power consumption of the display device and a first mapping relation, wherein the first mapping relation is the mapping relation between the power consumption of the display device and the on-state voltage.
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