CN109493802B - Display device and screen power consumption control method thereof - Google Patents
Display device and screen power consumption control method thereof Download PDFInfo
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- CN109493802B CN109493802B CN201710818232.1A CN201710818232A CN109493802B CN 109493802 B CN109493802 B CN 109493802B CN 201710818232 A CN201710818232 A CN 201710818232A CN 109493802 B CN109493802 B CN 109493802B
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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
- G09G3/22—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 using controlled light sources
- G09G3/30—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 using controlled light sources using electroluminescent panels
- G09G3/32—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 using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—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 using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
- G09G3/3225—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 using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
- G09G3/3233—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 using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix with pixel circuitry controlling the current through the light-emitting element
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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
- G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
- G09G2330/02—Details of power systems and of start or stop of display operation
- G09G2330/021—Power management, e.g. power saving
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Abstract
The application discloses a display device and a screen power consumption control method thereof, wherein the method comprises the steps that a driving circuit acquires and stores a current frame picture signal, determines display current required to be provided for displaying a current frame picture on a display panel according to the current frame picture signal, and feeds back the display current to a power supply selection module; the power supply selection module receives the display current fed back by the driving circuit, and determines the power supply of the display panel as the driving circuit when determining that the driving circuit can provide the display current. When the display panel is in the low power consumption mode, the power supply selection module enables the driving circuit to supply power for the display panel when determining that the driving circuit meets the power supply requirement of the display panel, and compared with the mode that an independent power supply is adopted to supply power for the display panel, the total power consumption of the screen of the display panel can be reduced under the same external condition.
Description
Technical Field
The present disclosure relates to the field of wireless communication technologies, and in particular, to a display device and a power consumption control method for a screen thereof.
Background
An Active-matrix organic light emitting diode (AMOLED) display panel is a panel mainly composed of a material which emits light by injecting and recombining carriers under the driving of an electric field by using an organic semiconductor and a light emitting material. Compared with the traditional LCD, the AMOLED display panel has the advantages of high response speed, wide color gamut, high contrast, self-luminescence and lower power consumption.
With the rapid development of AMOLED technology, the wearable products are more and more in variety, a larger displayable ratio, a lighter and thinner design will be the direction of future development, the battery technology is limited to be developed slowly, the reduction of display power consumption will be a great challenge, and a good display screen and a longer standby time will bring stronger competitiveness to screen manufacturers.
For the current wearable product, the function is relatively simple, the screen mainly works in a low power consumption mode, and the power consumption in the low power consumption mode is the largest influence factor of the standby time of the wearable product.
In the low power consumption mode, the AMOLED-based wearable display device generally sets a lower display brightness and a smaller display area, while reducing the refresh frequency. Currently, the wearable display device based on the AMOLED mainly adopts a fixed screen refresh frequency and an independent power supply mode.
The independent power supply mode mainly reduces the conversion efficiency along with the reduction of the display current, so that the power consumption data in the low power consumption mode is still higher. The conversion efficiency of the independent power supply is below 80% in the high power consumption mode, the conversion efficiency of the independent power supply is lower in the low power consumption mode, the screen brightness is reduced in the low power consumption mode, the display area is reduced, and therefore the display current consumption is smaller.
The independent power supply mode also has the problem of serious heat generation. The heating of the independent power supply is serious, the overheating of the product is unacceptable for users, and the experience of the heating wearable product for customers is not imaginable in summer.
In summary, the prior art has a technical problem of high power consumption in the low power consumption mode.
Disclosure of Invention
The embodiment of the application provides a display device and a screen power consumption control method thereof, which are used for solving the technical problem that the power consumption is higher in a low power consumption mode in the prior art.
The application provides a screen power consumption control method, which comprises the following steps:
the driving circuit acquires and stores a current frame picture signal, determines a display current required to be provided for displaying a current frame picture on the display panel according to the current frame picture signal, and feeds the display current back to the power supply selection module;
the power supply selection module receives the display current fed back by the driving circuit, and determines a power supply of the display panel as the driving circuit when determining that the driving circuit can provide the display current.
Further, determining a display current required to be provided for displaying the current frame picture on the display panel according to the current frame picture signal includes:
determining the number of the lighted pixels and the brightness of the lighted pixels of the current frame according to the current frame image signal;
and determining the display current required to be provided for displaying the current frame picture on the display panel according to the number of the lighted pixels of the current frame picture and the brightness of the lighted pixels.
Further, the method also comprises the following steps:
the driving circuit acquires a stored continuous multi-frame historical picture signal adjacent to the current frame picture signal; and determining the power consumption mode of the display panel according to the continuous multi-frame historical picture signals.
Further, the determining, by the driving circuit, the power consumption mode of the display panel according to the consecutive multi-frame history picture signals includes:
the drive circuit determines continuous N different historical pictures from continuous multi-frame historical pictures corresponding to the continuous multi-frame historical picture signals according to the continuous multi-frame historical picture signals, and the respective holding time lengths of the N different historical pictures and/or the number of different historical pictures in the set time length; and determining the current power consumption mode of the display panel according to the respective holding time lengths of the N different history pictures and/or the number of the different history pictures in the set time length, wherein N is an integer greater than or equal to 2.
Further, after determining the power consumption mode of the display panel, the method further includes:
the drive circuit acquires and stores the holding duration of the current frame and the lowest screen refreshing frequency of the current frame in the power consumption mode according to the current frame image signal;
the driving circuit acquires a stored current screen refreshing frequency, wherein the current screen refreshing frequency is the lowest screen refreshing frequency of a previous frame of historical picture signals;
and the driving circuit gradually adjusts the current screen refreshing frequency to the lowest screen refreshing frequency in the holding time length.
Further, the determining, by the driving circuit, the lowest screen refresh frequency of the current frame in the power consumption mode according to the current frame signal includes:
and the driving circuit determines the lowest screen refreshing frequency matched with the display current in the power consumption mode according to the display current, the power consumption mode and a one-to-one matching relation which is satisfied by a plurality of display currents and a plurality of lowest screen refreshing frequencies in different power consumption modes which are configured in advance.
The application provides a display device, including: the display device comprises a driving circuit, a display panel and a power supply selection module; the power supply selection module is connected with the independent power supply and the driving circuit, and is configured to select the driving circuit or the independent power supply to provide a power supply voltage for the display panel; the driving circuit is configured to acquire and store a current frame image signal, determine a display current required to be provided for displaying a current frame image on the display panel according to the current frame image signal, and feed back the display current to the power selection module; the power supply selection module is configured to receive the display current fed back by the driving circuit, and determine a power supply of the display panel as the driving circuit when determining that the driving circuit can provide the display current.
Further, the drive circuit is configured to: determining the number of the lighted pixels and the brightness of the lighted pixels of the current frame according to the current frame image signal; and determining the display current required to be provided for displaying the current frame picture on the display panel according to the number of the lighted pixels of the current frame picture and the brightness of the lighted pixels.
Further, the drive circuit is further configured to: acquiring stored continuous multi-frame historical picture signals adjacent to the current frame picture signal; and determining the power consumption mode of the display panel according to the continuous multi-frame historical picture signals.
Further, the drive circuit is specifically configured to: determining continuous N different historical pictures from the continuous multi-frame historical pictures corresponding to the continuous multi-frame historical picture signals according to the continuous multi-frame historical picture signals, and the respective holding duration of the N different historical pictures and/or the number of different historical pictures within a set time length; and determining the current power consumption mode of the display panel according to the respective holding time lengths of the N different history pictures and/or the number of the different history pictures in the set time length, wherein N is an integer greater than or equal to 2.
Further, the drive circuit is further configured to: after the power consumption mode of the display panel is determined, acquiring and storing the keeping duration of the current frame and the lowest screen refreshing frequency of the current frame in the power consumption mode according to the current frame image signal; acquiring a stored current screen refreshing frequency, wherein the current screen refreshing frequency is the lowest screen refreshing frequency of a previous frame of historical picture signals; gradually adjusting the current screen refresh frequency to the lowest screen refresh frequency of the current frame within the retention duration of the current frame.
Further, the drive circuit is configured to: and the driving circuit determines the lowest screen refreshing frequency matched with the display current in the power consumption mode according to the display current, the power consumption mode and a one-to-one matching relation which is satisfied by a plurality of display currents and a plurality of lowest screen refreshing frequencies in different power consumption modes which are configured in advance.
In the above embodiment of the present application, based on when the display panel is in the low power consumption mode, the power supply selection module makes the driving circuit supply power to the display panel when determining that the driving circuit meets the power supply requirement of the display panel, and compared with the case of adopting an independent power supply to supply power to the display panel, the total power consumption of the display panel can be reduced by 70.349% under the same external condition. Further, the total power consumption of the display panel can be further reduced under the same external conditions by adjusting the screen refreshing frequency in a frequency conversion mode within the holding duration of the current frame image on the display panel compared with adjusting the screen refreshing frequency to a fixed value. For example, by gradually decreasing the screen refresh rate from 15HZ to 10HZ, the total power consumption of the display panel can be decreased by 16.67% compared to directly adjusting the screen refresh rate to 15 HZ.
According to the method and the device, on the basis of effectively reducing the power consumption of the screen in the low-power-consumption mode, the standby time of the wearable product can be effectively prolonged under the condition of the same battery capacity; when the same standby time is long, the battery capacity of the wearable product can be reduced, the size and the thickness of the wearable product can be reduced, unacceptable experience caused by heating of the product can be avoided, and the method has important significance for future development of the product.
Drawings
FIG. 1 is a schematic diagram of a prior art structure for supplying power to a display panel by using an independent power supply;
FIG. 2 is a diagram illustrating a comparison between a screen refresh rate in a high power mode and a screen refresh rate in a low power mode in the prior art;
FIG. 3 is a diagram illustrating a relationship curve between a conversion efficiency of an independent power source and a display current when an independent power source is used to supply power to a display panel in the prior art;
FIG. 4-1 is a schematic diagram of a structure of an independent power supply or a driving circuit for supplying power to a display panel according to the present application;
fig. 4-2 is a schematic structural diagram of a display device provided in the present application;
fig. 4-3 are schematic structural diagrams of a screen refresh frequency adjustment apparatus provided in the present application;
FIG. 5 is a schematic diagram illustrating a method for controlling screen power consumption according to the present disclosure;
FIG. 6 is a schematic diagram illustrating a comparison of screen power consumption between an independent power supply mode and a driving circuit power supply mode in a low power consumption mode according to the present application;
FIG. 7 is a diagram illustrating a method of controlling screen power consumption according to the present disclosure;
FIG. 8 is a diagram illustrating a relationship between screen power consumption and screen refresh rate in a low power mode according to the present application;
FIG. 9 is a diagram illustrating a relationship between a screen power consumption reduction rate and a screen refresh rate in a low power mode according to the present application;
FIG. 10 is a diagram illustrating a relationship between screen power consumption and screen flicker rate in a low power mode according to the present application;
fig. 11 is a schematic diagram illustrating comparison between the screen power consumption of the low power consumption mode down-conversion mode for adjusting the screen refresh frequency and the screen refresh frequency adjusted to a fixed value.
Detailed Description
In the prior art, a wearable display device based on an AMOLED adopts a fixed screen refresh frequency and an independent power supply mode, which is shown in fig. 1. As shown in fig. 1, the display panel is powered by an independent power supply, the display panel is an AMOLED panel, the independent power supply provides two power supply voltages, one is a positive voltage ELVDD, the other is a negative voltage ELVSS, and the power supply voltages of the display panel in the high power consumption mode and the low power consumption mode are both provided by the independent power supply.
In addition, the screen refresh frequency f1 of the display panel in the high power consumption mode and the screen refresh frequency f2 of the display panel in the low power consumption mode are fixed values, for example, the screen refresh frequency of the high power consumption mode is 60HZ, and the screen refresh frequency of the low power consumption mode is at least 15 HZ. The screen refreshing frequency under different modes is burnt in the drive circuit through the OTP, and is burnt in the drive circuit through a dynamic Password (One-time Password, OTP), the dynamic Password is generated into an unpredictable random number combination related to time every 60 seconds according to a special algorithm, each Password can be used only once, and 43200 passwords can be generated every day.
The high power consumption mode is also called an operating mode, and in this mode, a user operates the display device to keep the screen in an active state all the time, and the power consumption data of the screen is high.
The low power mode is also called standby mode, in which the user leaves the screen in an idle state for a long time without operating the device. In this mode, the display panel may have two states, one state does not display any picture, the screen power consumption data is low, but the user experience is poor, and the other state continuously refreshes a frame of picture with low brightness at a low screen refresh frequency, which has better user experience compared with the case of no display, and compared with the high power consumption mode, the screen brightness is reduced in the low power consumption mode, the display area is reduced, so the current consumption is small.
As shown in fig. 2, the screen refresh rate of the high power mode is a fixed value, such as 60 HZ. The screen refresh rate in the low power mode is a fixed lower value, such as 15 HZ. In the low power consumption mode, the image is usually dark, the display area is small, and in order to avoid image flicker, the screen refresh frequency in the low power consumption mode cannot be too low, and is usually above 15 KHZ.
But the power consumption data in the low power consumption mode is still high due to the influence of the conversion efficiency of the independent power supply. As shown in fig. 3, when the supply voltages provided by the independent power supplies are V ═ 4.3V, V ═ 3.7V, V ═ 3.2V, and V ═ 2.9V, respectively, the conversion efficiency decreases with the decrease in the display current of the display panel, and therefore, the conversion efficiency of the supply voltages provided by the independent power supplies decreases with the decrease in the display current when the independent power supplies supply power, and therefore, the power consumption data in the low power consumption mode is still high due to the influence of the conversion efficiency of the independent power supplies.
The power supply of the independent power supply is switched to the power supply of the driving circuit to reduce the problem of large power consumption of the independent power supply in a low power consumption mode. As shown in fig. 4-1, the present application provides a display device including a separate power supply, a power selection module, a driving circuit, and a display panel, wherein the separate power supply, the power selection module, and the driving circuit are disposed on a main board of the display device, the driving circuit provides a voltage required for display of the display panel through OVDD2 and OVDD2, and the separate power supply provides a voltage required for display of the display panel through OVDD1 and OVSS1, both of which are connected to the power selection module.
Compared with the prior art, the application provides a display device has increased power selection module, and drive circuit also has power supply ability, in order to eliminate independent power supply's conversion efficiency problem, and then further reduce the screen consumption of low-power consumption mode, if drive circuit's power supply ability satisfies display panel's power supply demand under the low-power consumption mode, power selection module selects drive circuit as display panel's power supply, drive circuit's power supply ability also satisfies display panel's power supply demand under operating mode, power selection module still selects drive circuit as display panel's power supply, if drive circuit's power supply ability does not satisfy display panel's power supply demand under operating mode, selection module control switches display panel's power supply voltage into independent power supply again.
It should be noted that the display device provided in the present application includes, but is not limited to, a wearable display device based on AMOLED.
Based on the display device shown in fig. 4-1, an embodiment of the present application provides a screen power consumption control method, as shown in fig. 5, the method includes:
as shown in fig. 4-2, the driving circuit includes a control circuit, a storage module, a transceiver module and a power supply module, the transceiver module is configured to receive a multi-frame image signal to be displayed on the display panel sent by the main board, and the storage module is configured to store the multi-frame image signal received by the transceiver module; therefore, in step 101, the driving circuit acquires and stores the current frame picture signal through the transceiver module and the storage module.
102, a driving circuit determines a display current required to be provided for displaying a current frame picture on a display panel according to a current frame picture signal;
as shown in fig. 4-2, the control circuit determines the display current required to be provided for displaying the current frame image on the display panel according to the current frame image signal stored in the storage module, and the control circuit is a microprocessor or a signal processor.
Since the display current of the AMOLED display panel is closely related to the display area and the display brightness, the display area is related to the number of lighted pixels of the display panel, and the display brightness is related to the accumulated value of the brightness of the lighted pixels of the display panel, the display current consumed by the display panel to display the current frame picture can be determined according to the information of the brightness of the lighted pixels in the current frame signal and the number of lighted pixels.
Optionally, in step 102, the control circuit determines the number of lighted pixels and the brightness of the lighted pixels of the current frame according to the current frame image signal, and determines the display current required to be provided for displaying the current frame image on the display panel according to the number of lighted pixels and the brightness of the lighted pixels of the current frame image, and the preset corresponding relationship between the number of lighted pixels of the multiple frame image and the brightness of the lighted pixels and the plurality of display currents.
For example, the control circuit stores the corresponding relationship between the number of lit pixels and the luminance of the lit pixels and the plurality of display currents in the multi-frame screen, and the corresponding relationship between the number of lit pixels and the luminance of the lit pixels and the plurality of display currents in the multi-frame screen can be obtained by off-line training of an algorithm. For any frame picture signal, the corresponding relation between the number of the lighted pixels and the brightness of the lighted pixels of the corresponding frame picture and the display current required to display the frame picture on the display panel is determined by the following modes:
the method comprises the following steps: the method comprises the steps of extracting the information of the number of the lighted pixels and the information of the brightness of the lighted pixels from the frame picture signal, and determining the number of the lighted pixels and the brightness of the lighted pixels of the frame picture according to the extracted information of the number of the lighted pixels and the information of the brightness of the lighted pixels, wherein the brightness of the lighted pixels refers to the accumulated value of the brightness of all the lighted pixels in the current frame picture.
Step two: and monitoring the display current consumed by the display panel when the frame picture is displayed. Optionally, the control circuit includes a current monitoring module, and the current monitoring module monitors a display current consumed by the display panel to display the frame. If the driving circuit supplies power at this time, as shown in fig. 4-2, the driving circuit further includes a power module, and the display current consumed by the display panel to display the frame can be monitored by the power module.
Step three: the corresponding relation between the number of the lighted pixels of the frame picture and the brightness of the lighted pixels and the display current consumed by the display panel for displaying the frame picture is stored. Alternatively, the correspondence between the frame picture signal and the display current consumed for displaying the frame picture on the display panel may be stored.
103, the driving circuit feeds back display current to the power selection module;
as shown in fig. 4-2, the driving circuit feeds back the display current to the power selection module through the transceiving module.
104, the power supply selection module receives the display current fed back by the driving circuit;
in step 105, the power selection module determines the power supply of the display panel as the driving circuit when determining that the driving circuit can provide the display current.
The power selection module judges whether the drive circuit can provide the display current or not, and the implementation mode is as follows: the power supply selection module is pre-configured with a power supply current which can be provided by the drive circuit, and is configured with a switching condition of a power supply of the display panel according to the power supply current which can be provided by the drive circuit. Based on the configured switching condition, the power supply selection module judges whether the driving circuit can provide the display current according to the display current fed back by the driving circuit, and switches the power supply of the display panel from the independent power supply to the driving circuit when judging that the driving circuit can provide the display current. In addition to step 105, the method further comprises: and when the driving circuit is judged to be incapable of providing the display current, switching the power supply of the display panel into the independent power supply.
For example, the maximum power supply current that the driving circuit can provide is a fixed value Ia, the display current fed back to the power selection module by the driving circuit is Ib, when Ib ═ Ia × M, the driving circuit meets the power supply requirement of the display panel, the power supply of the display panel is switched from the independent power supply to the driving circuit, the driving circuit supplies power to the display panel, that is, the power supply module in fig. 4-2 supplies power to the display panel; when Ib > Ia × M, the driving circuit does not meet the power supply requirement of the display panel, the driving circuit switches the power supply of the display panel into the independent power supply, and the independent power supply supplies power to the display panel. It should be noted that M is a parameter, and M may be determined according to the actual situation of the display panel during displaying, and M is not necessarily a constant value. Or M can also be determined by a look-up table, or can also be set internally by the drive circuit, or can also be written and burned into the drive circuit externally.
It should be noted that the above steps 101 to 105 are applied in the low power consumption mode. Optionally, the steps 101 to 105 may also be applied in a high power consumption mode.
Under the low-power consumption mode, the power supply of the driving circuit is compared with the power supply of the independent power supply, no component needs to be added, the original circuit design is not influenced, the conversion efficiency problem of the independent power supply does not exist, the mainboard of the display equipment cannot generate heat seriously due to the power supply of the independent power supply, and the power consumption data is greatly reduced.
For example, experiments were performed with a certain AMOLED display panel, in a low power consumption mode, at 1cm2The display area of (2), the luminance condition of 35nits, and the same external conditions are taken as examples, and the average power consumption data corresponding to the driving circuit power supply mode and the average power consumption data corresponding to the independent power supply mode are shown in table 1.
TABLE 1
According to table 1, the average power consumption of the driving element was 6.535mW, the average power consumption of the light emitting element was 35.128mW, and the average power consumption of the display panel was 41.752mW when power was supplied from the independent power source, the average power consumption of the driving element was 12.376mW, the average power consumption of the light emitting element was 0.014mW, and the average power consumption of the display panel was 12.38mW when power was supplied from the driving circuit. Based on the data in table 1, the comparison between the average driving power consumption, the average light emitting power consumption and the average display panel power consumption of the driving circuit powered by the independent power source is shown in fig. 6, and in comparison, the average display panel power consumption is reduced by 70.349% by using the driving circuit powered by the independent power source, so that the power consumption data of the screen in the low power consumption mode can be effectively reduced by using the driving circuit powered manner.
On the basis that the driving circuit can supply power to the display panel, the method also provides an adjustable scheme of the screen refreshing frequency, and the key point is the dynamic adjustment of the screen refreshing frequency in the low power consumption mode. In the low power consumption mode, the display frame of the screen is determined by the main board, for example, a frame of frame is updated at regular intervals (generally 1 minute or 1 hour, etc.); because the time for maintaining a frame of picture on the screen is fixed and longer, if the screen refresh frequency is fixed under the condition of no picture change, the loss of maintaining the frame of picture on the screen is still higher in the low power consumption mode. The application provides a method for dynamically adjusting the corresponding screen refreshing frequency within the retention time of a frame of picture under the condition that the screen picture is not changed in a low power consumption mode, which is used for reducing the power consumption data of a power consumption mode line.
As shown in fig. 4-2, the control circuit of the driving circuit includes a screen refresh frequency adjustment module, and the screen refresh frequency adjustment module dynamically adjusts the screen refresh frequency of the current frame within the retention duration of the current frame, especially when the screen is in the low power consumption mode, the screen refresh frequency adjustment module dynamically adjusts the screen refresh frequency of the current frame within the retention duration of the current frame.
As shown in fig. 4-3, the screen refresh frequency adjustment module includes a processing unit, a storage unit and a transceiver unit, wherein the transceiver unit communicates with the control circuit in fig. 4-2 through the input/output interface, receives the current frame picture signal and the multiple frames of history picture signals, the storage unit is configured to store the current frame picture signal and the multiple frames of history picture signals, and the processing unit is configured to adjust the screen refresh frequency of the current frame picture.
As shown in fig. 7, the screen refresh frequency adjustment module adjusts the screen refresh frequency of the current frame, and specifically includes the following steps:
Optionally, a specific implementation manner of step 202 includes: determining N continuous different historical pictures and respective holding time lengths of the N continuous different historical pictures from the continuous multi-frame historical pictures corresponding to the continuous multi-frame historical picture signals according to the continuous multi-frame historical picture signals; and determining the current power consumption mode of the display panel according to the respective holding time lengths of N continuous different history pictures, wherein N is an integer greater than or equal to 2. Because the interval of different frame pictures in the high power consumption mode is shorter, the interval of different frame pictures in the low power consumption mode is longer, or a fixed frame picture is displayed on the display panel in the low power consumption mode, the holding time is particularly long. Therefore, when the respective holding time periods of the N consecutive different history pictures are all smaller than the first threshold, the display panel is in the high power consumption mode, and when the respective holding time periods of the N consecutive different history pictures are all larger than the second threshold, the display panel is in the low power consumption mode. Wherein the second threshold is greater than or equal to the first threshold.
Optionally, a specific implementation manner of step 202 includes: determining the number of different historical pictures within a set time length from the continuous multi-frame historical pictures corresponding to the continuous multi-frame historical picture signals according to the continuous multi-frame historical picture signals; and determining the power consumption mode of the display panel according to the number of different history pictures in the set time length. Because the different pictures are updated faster in a fixed time span in the high power consumption mode, that is, the number of the displayed different pictures is larger, the different pictures are updated slower in the low power consumption mode, or a fixed frame of picture is displayed on the display panel in the low power consumption mode. Therefore, when the number of different history pictures within the set time length is greater than the third threshold, the display panel is in the high power consumption mode, and when the number of different history pictures within the set time length is less than the fourth threshold, the display panel is in the low power consumption mode. The third threshold is greater than or equal to a fourth threshold which is greater than or equal to 1, and the third threshold is greater than or equal to 2.
Optionally, a specific implementation manner of step 202 includes: determining continuous N different historical pictures and the respective holding time of the N different historical pictures and the number of different historical pictures within a set time length from the continuous multi-frame historical picture corresponding to the continuous multi-frame historical picture signal according to the continuous multi-frame historical picture signal; and determining the power consumption mode of the display panel according to the respective holding time of the N continuous different history pictures and the number of the different history pictures in the set time length. Based on the two implementation manners, when the respective holding time lengths of the N consecutive different history pictures are all smaller than the first threshold and the number of the different history pictures within the set time length is larger than the third threshold, the display panel is in the high power consumption mode, and when the respective holding time lengths of the N consecutive different history pictures are all larger than the second threshold and the number of the different history pictures within the set time length is smaller than the fourth threshold, the display panel is in the low power consumption mode.
optionally, the specific implementation manner of step 203 includes: the driving circuit is pre-configured with a one-to-one matching relation which is satisfied by a plurality of display currents and a plurality of lowest screen refreshing frequencies under different power consumption modes; based on the power consumption mode of the display panel determined in step 202 and the display current required to be provided for displaying the current frame picture on the display panel determined in step 101; by searching for a one-to-one matching relationship that is satisfied by the plurality of display currents and the plurality of lowest screen refresh frequencies in the configured different power consumption modes, the lowest screen refresh frequency that matches the display current determined in step 101 in the power consumption mode can be determined.
Optionally, the screen refresh frequency in the high power consumption mode is higher than the screen refresh frequency in the low power consumption mode, the high power consumption mode configures a lowest screen refresh frequency, and the low power consumption mode configures a lowest screen refresh frequency.
Optionally, the setting of the minimum screen refresh frequency is determined according to the actual screen display effect and the screen flicker rate. The actual display effect and the screen flicker rate are related to the display area and the display brightness of the current frame picture displayed on the display panel, the display area of the current frame picture is related to the number of the lighted pixels of the current frame picture, and the display brightness of the current frame picture is related to the accumulated brightness of the lighted pixels of the current frame picture. For example, in the high power consumption mode, the display area of the current frame is large, and when the display brightness is high, the display current consumed by the current frame is large, and according to an afterglow effect, human eyes can find out the relevant factors affecting the display effect, such as screen jitter, more easily, and at this time, the screen refresh frequency needs to be increased, so that the setting value of the lowest screen refresh frequency is high. For another example, in the low power consumption mode, the display area of the current frame is small, when the display brightness of the current frame is low, the display current consumed by the current frame is small, and according to an afterglow effect, human eyes cannot easily recognize the shaking of the screen and other relevant factors influencing the display effect, at this time, the power consumption can be reduced by reducing the screen refresh frequency, and the set value of the lowest screen refresh frequency is small.
Optionally, assuming that the display current consumed by the current frame in the low power consumption mode is Ic, the maximum screen refresh frequency in the low power consumption mode is F0, the maximum display current of the displayed frame on the display panel in the low power consumption mode is Im, and the lowest screen refresh frequency in the low power consumption mode is F, then F is F0 (Ic/Im) × N.
The N is a parameter, the set value of the N can be set according to the actual display effect, the N is not necessarily a fixed value, or can be a set value in a lookup table, or can be set through the inside of the driving circuit, or can be written in and burned into the driving circuit through the outside. Wherein, the maximum screen refresh frequency F0 in the low power consumption mode is 15 Hz. It should be noted that the setting of the lowest screen refresh frequency in the low power mode includes, but is not limited to, the above formula.
The lowest screen refresh frequency for the high power mode may be determined in a similar manner and will not be discussed further herein.
In the application, on the basis of ensuring the display quality of the screen, the screen refresh frequency in the low power consumption mode can be set to be 15Hz or below 15Hz, and the lowest screen refresh frequency in the low power consumption mode can be set to be 10Hz or below 10 Hz.
When an experiment is performed on a certain AMOLED display panel, in the low power consumption mode, the power consumption data curves corresponding to different screen refresh frequencies under the conditions of 100% display area, 100% brightness and the same external conditions are shown in fig. 8. As can be seen from fig. 8, as the screen refresh frequency decreases, the average power consumption of the display panel gradually decreases. When the screen refresh frequency is less than 15HZ, the screen loss reduction rate gradually increases. Therefore, in order to reduce the screen power consumption in the low power mode, the screen refresh frequency can be adjusted to be below 15 HZ.
In order to more accurately obtain the lowest screen refresh frequency in the low power consumption mode, a screen loss reduction rate curve of fig. 9, which is shown in the same condition when the screen refresh frequency is less than 30HZ, is obtained through a plurality of experiments, and as can be seen from fig. 9, as the screen refresh frequency is reduced from 30HZ, the screen loss reduction amplitude is gradually increased, especially when the screen refresh frequency is 10HZ or less, the screen loss reduction amplitude is more significant, and therefore, the lowest screen refresh frequency in the low power consumption mode can be set to 10HZ or less than 10 HZ.
The lowest screen refresh frequency in the low power consumption mode is also related to the screen flicker rate, and the relationship between the screen refresh frequency (10HZ to 60HZ) and the screen flicker rate under the same conditions is shown in fig. 10. As can be seen from fig. 10, the screen refresh frequency is below 15Hz, and the screen flicker rate of the screen is substantially in a linear state as the screen refresh frequency decreases, so that the display quality of the screen is not greatly affected when the lowest screen refresh frequency in the low power consumption mode can be set at 10Hz or below 10 Hz.
When the screen power consumption in the low power consumption mode can be further reduced by comprehensively considering the screen display quality and the screen flicker curve, the screen refresh frequency may be set at 15Hz or below 15Hz, and the lowest screen refresh frequency in the low power consumption mode may be set at 10Hz or below 10 Hz.
in step 205, the current screen refresh frequency is gradually adjusted to the lowest screen refresh frequency of the current frame in the power consumption mode within the retention duration of the current frame.
In step 205, in the low power consumption mode, gradually adjusting the current screen refresh frequency to the lowest screen refresh frequency of the current frame within the retention duration of the current frame, which means that the screen refresh frequency is adjusted in a frequency conversion manner, that is, a plurality of different screen refresh frequencies are set between the current screen refresh frequency and the lowest screen refresh frequency, and within the retention duration of the current frame, the screen refresh frequency of the current frame is gradually adjusted through the plurality of different screen refresh frequencies until the screen refresh frequency of the current frame is adjusted to the lowest screen refresh frequency.
Optionally, in the low power consumption mode, when the screen refresh frequency of any one frame of picture is adjusted by using a frequency conversion mode, there may be multiple configuration modes, for example, the screen refresh frequency of a certain frame of picture signal is configured to be multiple different screen refresh frequencies, and one frequency conversion mode is that the multiple screen refresh frequencies configured by different frame of picture signals are all different; another way of frequency conversion is to configure the plurality of screen refresh frequencies for each of the consecutive multi-frame picture signals.
In the low power consumption mode, the screen refreshing frequency of the current frame is gradually adjusted from the current screen refreshing frequency to the lowest screen refreshing frequency by adopting a frequency conversion mode, and compared with the prior art that the screen refreshing frequency of the current frame is directly adjusted to the fixed screen refreshing frequency, the power consumption of the screen can be further reduced.
For example, an experiment is performed on a certain AMOLED display panel, in the low power consumption mode, a picture displayed on the display panel is a dial pattern, and under the same external conditions, when the dial pattern adopts a fixed screen refresh frequency of 15HZ and a screen refresh frequency gradually reduced from 15HZ within a set time length, corresponding screen power consumption data under the same display effect are as shown in fig. 11. The histogram 1 is the screen power consumption data measured when the screen refresh rate is adjusted to 15HZ in the low power consumption mode, and the histogram 2 is the screen power consumption data measured when the screen refresh rate is gradually decreased from 15HZ to 10HZ in the low power consumption mode by using 15HZ as a reference point in a frequency conversion manner. As can be seen from fig. 11, the screen power consumption generated by adjusting the screen refresh frequency of the dial pattern in a frequency conversion manner is at least 16.67% lower than the screen power consumption generated by using a fixed screen refresh frequency. Therefore, the frequency conversion mode can achieve good display picture and greatly reduce power consumption.
After step 205, the screen refresh frequency adjustment module amplifies the multiple screen refresh frequencies of the current frame determined in step 205 and outputs the amplified multiple screen refresh frequencies to the control circuit in sequence. As shown in fig. 4-2, the control circuit is electrically connected to the gate driving circuit and the source driving circuit, and the control circuit performs adaptive frequency conversion processing on the synchronization signals of the gate driving circuit and the source driving circuit for a plurality of screen refresh frequencies of a current frame of picture, and then controls the display of the current frame of picture on the display panel through the source driving circuit and the gate driving circuit.
In summary, in the present application, based on steps 101 to 105, when the display panel is in the low power consumption mode, and the power supply selection module makes the driving circuit supply power to the display panel when determining that the driving circuit meets the power supply requirement of the display panel, compared with the case of supplying power to the display panel by using an independent power supply, the total power consumption of the display panel can be reduced by 70.349% under the same external condition.
Further, based on steps 201 to 205, for the current frame on the display panel, the total power consumption of the display panel can be further reduced under the same external condition by adjusting the screen refresh frequency in a frequency conversion manner within the retention time of the current frame, compared with adjusting the screen refresh frequency to a fixed value. For example, by gradually decreasing the screen refresh rate from 15HZ to 10HZ, the total power consumption of the display panel can be decreased by 16.67% compared to directly adjusting the screen refresh rate to 15 HZ.
According to the method and the device, on the basis of effectively reducing the power consumption of the screen in the low-power-consumption mode, the standby time of the wearable product can be effectively prolonged under the condition of the same battery capacity; when the same standby time is long, the battery capacity of the wearable product can be reduced, the size and the thickness of the wearable product can be reduced, unacceptable experience caused by heating of the product can be avoided, and the method has important significance for future development of the product.
Based on the same inventive concept, the present application provides a display apparatus as shown in fig. 4-1, including: the display device comprises a driving circuit, a display panel and a power supply selection module; the power supply selection module is connected with the independent power supply and the driving circuit, and is configured to select the driving circuit or the independent power supply to provide a power supply voltage for the display panel; the driving circuit is configured to acquire and store a current frame image signal, determine a display current required to be provided for displaying a current frame image on the display panel according to the current frame image signal, and feed back the display current to the power selection module; and the power supply selection module is configured to receive the display current fed back by the driving circuit and determine the power supply of the display panel as the driving circuit when the driving circuit is determined to be capable of providing the display current.
Further, the drive circuit is configured to: determining the number of the lighted pixels and the brightness of the lighted pixels of the current frame according to the current frame image signal; and determining the display current required to be provided for displaying the current frame picture on the display panel according to the number of the lighted pixels of the current frame picture and the brightness of the lighted pixels.
Further, the drive circuit is further configured to: acquiring stored continuous multi-frame historical picture signals adjacent to the current frame picture signal; and determining the power consumption mode of the display panel according to the continuous multi-frame historical picture signals.
Further, the drive circuit is specifically configured to: determining continuous N different historical pictures from the continuous multi-frame historical pictures corresponding to the continuous multi-frame historical picture signals according to the continuous multi-frame historical picture signals, and the respective holding duration of the N different historical pictures and/or the number of different historical pictures within a set time length; and determining the current power consumption mode of the display panel according to the respective holding time lengths of the N different history pictures and/or the number of the different history pictures in the set time length, wherein N is an integer greater than or equal to 2.
Further, the drive circuit is further configured to: after the power consumption mode of the display panel is determined, acquiring and storing the keeping duration of the current frame and the lowest screen refreshing frequency of the current frame in the power consumption mode according to the current frame image signal; acquiring a stored current screen refreshing frequency, wherein the current screen refreshing frequency is the lowest screen refreshing frequency of a previous frame of historical picture signals; gradually adjusting the current screen refresh frequency to the lowest screen refresh frequency of the current frame within the retention duration of the current frame.
Further, the drive circuit is configured to: and the driving circuit determines the lowest screen refreshing frequency matched with the display current in the power consumption mode according to the display current, the power consumption mode and a one-to-one matching relation which is satisfied by a plurality of display currents and a plurality of lowest screen refreshing frequencies in different power consumption modes which are configured in advance.
It will be apparent to those skilled in the art that various changes and modifications may be made in the embodiments of the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the embodiments of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to encompass such modifications and variations.
Claims (10)
1. A screen power consumption control method, comprising:
the driving circuit acquires and stores a current frame picture signal, determines a display current required to be provided for displaying a current frame picture on the display panel according to the current frame picture signal, and feeds the display current back to the power supply selection module;
the power supply selection module receives the display current fed back by the driving circuit, and determines a power supply of the display panel as the driving circuit when determining that the driving circuit can provide the display current; determining a power supply of the display panel as an independent power supply when it is determined that the driving circuit cannot provide the display current;
the driving circuit acquires a stored continuous multi-frame historical picture signal adjacent to the current frame picture signal, determines a power consumption mode of the display panel according to the continuous multi-frame historical picture signal, and adjusts the current screen refreshing frequency to the lowest screen refreshing frequency in the power consumption mode;
the driving circuit comprises a power module, and the power module and the independent power supply belong to independent power supplies.
2. The method of claim 1, wherein determining a display current required to be supplied for displaying the current frame picture on a display panel according to the current frame picture signal comprises:
determining the number of the lighted pixels and the brightness of the lighted pixels of the current frame according to the current frame image signal;
and determining the display current required to be provided for displaying the current frame picture on the display panel according to the number of the lighted pixels of the current frame picture and the brightness of the lighted pixels.
3. The method of claim 2, wherein the determining, by the driving circuit, the power consumption mode in which the display panel is located according to the consecutive multiple frames of the history picture signal comprises:
the drive circuit determines N continuous different history pictures and the number of the different history pictures in the respective holding time length and/or the set time length of the N different history pictures from the continuous multi-frame history pictures corresponding to the continuous multi-frame history picture signals according to the continuous multi-frame history picture signals; and determining the current power consumption mode of the display panel according to the respective holding time lengths of the N different history pictures and/or the number of the different history pictures in the set time length, wherein N is an integer greater than or equal to 2.
4. The method of claim 2, wherein after determining the power consumption mode in which the display panel is located, further comprising:
the drive circuit acquires and stores the holding duration of the current frame and the lowest screen refreshing frequency of the current frame in the power consumption mode according to the current frame image signal;
the driving circuit acquires a stored current screen refreshing frequency, wherein the current screen refreshing frequency is the lowest screen refreshing frequency of a previous frame of historical picture signals;
and the driving circuit gradually adjusts the current screen refreshing frequency to the lowest screen refreshing frequency in the holding time length.
5. The method of claim 4, wherein the determining, by the driver circuit, the lowest screen refresh frequency of the current frame in the power consumption mode based on the current frame picture signal comprises:
and the driving circuit determines the lowest screen refreshing frequency matched with the display current in the power consumption mode according to the display current, the power consumption mode and a one-to-one matching relation which is satisfied by a plurality of display currents and a plurality of lowest screen refreshing frequencies in different power consumption modes which are configured in advance.
6. A display device, comprising: the display device comprises a driving circuit, a display panel and a power supply selection module; the power supply selection module is connected with an independent power supply and the driving circuit, and is configured to select the driving circuit or the independent power supply to provide a power supply voltage for the display panel;
the driving circuit is configured to acquire and store a current frame picture signal, determine a display current required to be provided for displaying a current frame picture on the display panel according to the current frame picture signal, and feed back the display current to the power supply selection module;
the power supply selection module is configured to receive the display current fed back by the driving circuit, and determine a power supply of the display panel as the driving circuit when determining that the driving circuit can provide the display current; determining a power supply of the display panel as an independent power supply when it is determined that the driving circuit cannot provide the display current;
the drive circuit is further configured to acquire a stored continuous multi-frame historical picture signal adjacent to the current frame picture signal; determining a power consumption mode of the display panel according to the continuous multi-frame historical picture signals, and adjusting the current screen refreshing frequency to the lowest screen refreshing frequency in the power consumption mode;
the driving circuit comprises a power module, and the power module and the independent power supply belong to independent power supplies.
7. The display device of claim 6, wherein the drive circuit is configured to:
determining the number of the lighted pixels and the brightness of the lighted pixels of the current frame according to the current frame image signal;
and determining the display current required to be provided for displaying the current frame picture on the display panel according to the number of the lighted pixels of the current frame picture and the brightness of the lighted pixels.
8. The display device of claim 7, wherein the drive circuit is specifically configured to:
determining continuous N different historical pictures from the continuous multi-frame historical pictures corresponding to the continuous multi-frame historical picture signals according to the continuous multi-frame historical picture signals, and the respective holding duration of the N different historical pictures and/or the number of different historical pictures within a set time length; and determining the current power consumption mode of the display panel according to the respective holding time lengths of the N different history pictures and/or the number of the different history pictures in the set time length, wherein N is an integer greater than or equal to 2.
9. The display device of claim 7, wherein the drive circuit is further configured to:
after the power consumption mode of the display panel is determined, acquiring and storing the keeping duration of the current frame and the lowest screen refreshing frequency of the current frame in the power consumption mode according to the current frame image signal;
acquiring a stored current screen refreshing frequency, wherein the current screen refreshing frequency is the lowest screen refreshing frequency of a previous frame of historical picture signals;
gradually adjusting the current screen refresh frequency to the lowest screen refresh frequency of the current frame within the retention duration of the current frame.
10. The display device of claim 9, wherein the drive circuit is configured to:
and the driving circuit determines the lowest screen refreshing frequency matched with the display current in the power consumption mode according to the display current, the power consumption mode and a one-to-one matching relation which is satisfied by a plurality of display currents and a plurality of lowest screen refreshing frequencies in different power consumption modes which are configured in advance.
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| CN112489595A (en) * | 2019-09-11 | 2021-03-12 | 上海和辉光电有限公司 | Display device and power consumption control method |
| CN113160748B (en) * | 2020-01-22 | 2022-03-29 | Oppo广东移动通信有限公司 | Display screen frequency conversion method, display driving integrated circuit chip and application processor |
| CN112419993B (en) * | 2020-11-28 | 2023-05-30 | 广东志慧芯屏科技有限公司 | Low-power-consumption low-frequency driving method and system using time-sharing driving |
| CN112967683A (en) * | 2021-02-09 | 2021-06-15 | 上海天马有机发光显示技术有限公司 | Power supply control method, power supply control chip, display panel and display device |
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