WO2022217730A1 - 灰阶控制方法以及显示面板 - Google Patents

灰阶控制方法以及显示面板 Download PDF

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Publication number
WO2022217730A1
WO2022217730A1 PCT/CN2021/098947 CN2021098947W WO2022217730A1 WO 2022217730 A1 WO2022217730 A1 WO 2022217730A1 CN 2021098947 W CN2021098947 W CN 2021098947W WO 2022217730 A1 WO2022217730 A1 WO 2022217730A1
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WO
WIPO (PCT)
Prior art keywords
grayscale
current
duration
backlight unit
value
Prior art date
Application number
PCT/CN2021/098947
Other languages
English (en)
French (fr)
Inventor
李文芳
Original Assignee
Tcl华星光电技术有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Tcl华星光电技术有限公司 filed Critical Tcl华星光电技术有限公司
Priority to US17/426,487 priority Critical patent/US11948491B2/en
Publication of WO2022217730A1 publication Critical patent/WO2022217730A1/zh

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Classifications

    • 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
    • G09G3/2007—Display of intermediate tones
    • 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
    • G09G3/3406—Control of illumination source
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0233—Improving the luminance or brightness uniformity across the screen
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/0626—Adjustment of display parameters for control of overall brightness
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/0626—Adjustment of display parameters for control of overall brightness
    • G09G2320/0633—Adjustment of display parameters for control of overall brightness by amplitude modulation of the brightness of the illumination source
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/0626—Adjustment of display parameters for control of overall brightness
    • G09G2320/064—Adjustment of display parameters for control of overall brightness by time modulation of the brightness of the illumination source
    • 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
    • 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
    • G09G2330/04—Display protection
    • G09G2330/045—Protection against panel overheating
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2354/00—Aspects of interface with display user
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2360/00—Aspects of the architecture of display systems
    • G09G2360/16—Calculation or use of calculated indices related to luminance levels in display data
    • 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
    • G09G3/2007—Display of intermediate tones
    • G09G3/2018—Display of intermediate tones by time modulation using two or more time intervals
    • G09G3/2022—Display of intermediate tones by time modulation using two or more time intervals using sub-frames
    • 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]

Definitions

  • the invention relates to the technical field of communications, and in particular, to a grayscale control method and a display panel.
  • Mini-LED lamp beads have the characteristics of long life, high brightness, low power consumption, small size and ultra-high resolution, Mini-LED lamp beads have been widely used in backlight modules of display panels.
  • the present invention provides a grayscale control method and a display panel, which effectively solve the problem that the use of a constant voltage to drive the backlight unit causes the excessive driving current to be generated due to heat generation after long-term operation, which in turn leads to excessive operating power. regulation issue.
  • the present invention provides a grayscale control method, which is applied to a display panel including a backlight unit, and the grayscale control method includes:
  • the grayscale value of the backlight unit is adjusted to a target grayscale value according to the duration.
  • the step of acquiring the duration for which the current driving current output to the backlight unit exceeds a preset current value specifically includes:
  • the sum of the durations of the alarm signal appearing within the one frame time is the duration that the current driving current exceeds a preset current value.
  • the one frame time includes a plurality of subfields, the alarm signal appears in a plurality of adjacent subfields, and/or the alarm signal appears in a plurality of nonadjacent subfields Inside.
  • the durations of a plurality of the subfields are equal, and/or the durations of the subfields are not equal.
  • steps including:
  • a weighted calculation is performed according to a preset formula and the duration of the target subfield to determine the duration for which the current driving current exceeds the preset current value.
  • the step of adjusting the grayscale value of the backlight unit to the target grayscale value according to the duration specifically includes:
  • the grayscale value lookup table includes mapping information of multiple calibration durations and multiple grayscale values
  • the grayscale value corresponding to the duration is determined according to the grayscale value lookup table as the target grayscale value.
  • the method further includes:
  • a target driving current output to the backlight unit is determined according to the target grayscale value.
  • the method further includes:
  • the step of obtaining the duration for which the current driving current output to the backlight unit exceeds the preset current value within a frame time is returned.
  • the present invention also provides a display panel, the display panel includes:
  • At least one driving circuit electrically connected to the backlight unit for driving the backlight unit
  • the grayscale output module is electrically connected to the driving circuit, and is used for determining to provide the driving circuit with the driving circuit for driving the backlight unit to emit light according to the duration of the current driving current output to the backlight unit exceeding a preset current value. desired target grayscale value.
  • the display panel further includes a detection unit, and the detection unit is configured to output an alarm signal to the grayscale output module when the current driving current exceeds the preset current value, so that the grayscale output
  • the order output module determines that the sum of the durations of the alarm signal appearing in one frame time is the duration.
  • the one frame time includes a plurality of subfields, the alarm signal appears in a plurality of adjacent subfields, and/or the alarm signal appears in a plurality of nonadjacent subfields Inside.
  • the durations of a plurality of the subfields are equal, and/or the durations of the subfields are not equal.
  • the detection unit is used to determine the subfield in which the alarm signal occurs within the one frame time as the target subfield, and according to the preset formula and The duration of the target subfield is weighted to determine the duration for which the current drive current exceeds a preset current value.
  • the grayscale output module is further configured to output a reset signal to the detection unit after the one frame time ends, so that the detection unit stops outputting the alarm signal.
  • a detection resistor is provided on the drive circuit, the detection unit is electrically connected to both ends of the detection resistor, and the detection unit is based on the resistance value of the detection resistor and the voltage across the detection resistor. Determine the current drive current.
  • the grayscale output module further includes a power supply unit, and the power supply unit is used to supply power to the detection unit.
  • the present invention also provides a mobile terminal, the mobile terminal includes a display panel, and the display panel includes:
  • At least one driving circuit electrically connected to the backlight unit for driving the backlight unit
  • the grayscale output module is electrically connected to the driving circuit, and is used for determining to provide the driving circuit with the driving circuit for driving the backlight unit to emit light according to the duration of the current driving current output to the backlight unit exceeding a preset current value. desired target grayscale value.
  • the display panel further includes a detection unit, and the detection unit is configured to output an alarm signal to the grayscale output module when the current driving current exceeds the preset current value, so that the grayscale output
  • the order output module determines that the sum of the durations of the alarm signal appearing in one frame time is the duration.
  • the one frame time includes a plurality of subfields, the alarm signal appears in a plurality of adjacent subfields, and/or the alarm signal appears in a plurality of nonadjacent subfields Inside.
  • the durations of a plurality of the subfields are equal, and/or the durations of the subfields are not equal.
  • the present invention provides a gray-scale control method, which is applied to a display panel including a backlight unit.
  • the gray-scale control method includes: within a frame time, acquiring the duration of the current driving current output to the backlight unit exceeding a preset current value. time, after that, adjust the grayscale value of the backlight unit to the target grayscale value according to the duration, and the grayscale control method provided by the present invention.
  • the gray-scale value of the backlight unit is adjusted to the target gray-scale value, thereby adjusting the driving current of the backlight unit when emitting light in the next frame, effectively avoiding the problem that the working power of the backlight unit exceeds the specification.
  • FIG. 1 is a schematic flowchart of a grayscale control method provided by an embodiment of the present invention.
  • FIG. 2 is a further schematic flowchart of a grayscale control method provided by an embodiment of the present invention.
  • FIG. 3 is a schematic structural diagram of a display panel provided by an embodiment of the present invention.
  • FIG. 4 is a schematic diagram of a detailed structure of a display panel provided by an embodiment of the present invention.
  • FIG. 5 is a schematic structural diagram of a mobile terminal provided by an embodiment of the present invention.
  • FIG. 6 is a schematic diagram of a detailed structure of a mobile terminal provided by an embodiment of the present invention.
  • first and second are only used for descriptive purposes, and should not be construed as indicating or implying relative importance or implying the number of indicated technical features. Thus, features defined as “first”, “second” may expressly or implicitly include one or more of said features. In the description of the present invention, “plurality” means two or more, unless otherwise expressly and specifically defined.
  • the terms “installed”, “connected” and “connected” should be understood in a broad sense, unless otherwise expressly specified and limited, for example, it may be a fixed connection or a detachable connection Connection, or integral connection; it can be mechanical connection, electrical connection or can communicate with each other; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal communication of two elements or the interaction of two elements relation.
  • installed should be understood in a broad sense, unless otherwise expressly specified and limited, for example, it may be a fixed connection or a detachable connection Connection, or integral connection; it can be mechanical connection, electrical connection or can communicate with each other; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal communication of two elements or the interaction of two elements relation.
  • a first feature "on” or “under” a second feature may include the first and second features in direct contact, or may include the first and second features Not directly but through additional features between them.
  • the first feature being “above”, “over” and “above” the second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is level higher than the second feature.
  • the first feature is “below”, “below” and “below” the second feature includes the first feature being directly below and diagonally below the second feature, or simply means that the first feature has a lower level than the second feature.
  • the present invention aims at the backlight unit in the existing display panel, because it is driven by a constant voltage, an excessive driving current will be generated due to heat after a long time of operation, and then the problem that the working power of the backlight unit exceeds the specification occurs.
  • the completed embodiment is used to solve this problem.
  • FIG. 1 is a schematic flowchart of a grayscale control method provided by an embodiment of the present invention.
  • the grayscale control method is applied to A display panel including a backlight unit.
  • the specific process of the grayscale control method provided by the embodiment of the present invention may be as follows:
  • Obtaining step S101 within a frame time, obtaining the duration for which the current driving current output to the backlight unit exceeds a preset current value.
  • an alarm may be sent to the system after the above-mentioned current driving current exceeds the preset current value, and then the above-mentioned duration time may be acquired according to the information of the alarm.
  • FIG. 2 is a further schematic flowchart of a grayscale control method provided by an embodiment of the present invention.
  • the above obtaining step S101 may specifically include:
  • the alarm signal output step S1011 within a frame time, when the current driving current output to the backlight unit exceeds a preset current value, output an alarm signal;
  • Duration determination step S1012 determining that the sum of the durations in which the alarm signal appears within a frame time is the duration during which the current driving current exceeds the preset current value.
  • the system when the current driving current has not exceeded the preset current value, the system will output a high-level turn-off signal, and when the current driving current exceeds the preset current value, the high The level shutdown signal will jump to a low-level alarm signal.
  • the alarm signal may also be a high-level signal, that is, in this modification, the shutdown signal is low level signal.
  • a frame is divided into several subfields of equal duration, and the above-mentioned alarm signal may appear continuously in several adjacent subfields, or intermittently in several nonadjacent subfields.
  • the duration can be obtained by calculating the sum of the number of subfields in which the alarm signal appears.
  • a frame is also divided into several subfields with different durations. When calculating the sum of the number of subfields in which the alarm signal appears, it is necessary to perform a weighted calculation according to a preset formula to obtain the duration.
  • the way to obtain the above-mentioned duration can also be that when the above-mentioned current driving current exceeds the preset current value and when the above-mentioned current driving current decreases to be lower than the preset current value, the system records the time respectively, and finally records by calculating. The difference between the times below gets the duration.
  • the system can also use all the time remaining in the current frame as the duration after the current drive current exceeds the preset current value.
  • Adjusting step S102 adjusting the grayscale value of the backlight unit to the target grayscale value according to the duration.
  • the target grayscale value is smaller than the grayscale value corresponding to the current driving current. After adjusting the grayscale value of the backlight unit to the target grayscale value, the driving current inside the backlight unit will be reduced. small, so as to avoid the problem that the power exceeds the specification when the backlight unit emits light in the next frame.
  • a grayscale value look-up table that records the mapping information of multiple calibration durations and multiple grayscale values can be stored in the system in advance. table to adjust the grayscale value of the backlight unit.
  • the above adjustment step S102 may specifically include:
  • Step S1021 of obtaining a grayscale value lookup table when the duration exceeds a preset time, obtain a grayscale value lookup table, and the grayscale value lookup table includes mapping information of multiple calibration durations and multiple grayscale values;
  • the target grayscale value determination step S1022 according to the grayscale value lookup table, the grayscale value corresponding to the duration is determined as the target grayscale value.
  • mapping information of multiple calibration durations and multiple grayscale values stored in the grayscale lookup table may be one calibration duration corresponding to one grayscale value, or one calibration duration corresponding to one grayscale value. order value.
  • the way of judging whether the above-mentioned duration exceeds the preset time may be by judging whether the total number of subfields in which the above-mentioned alarm signal occurs exceeds the preset number, and if so, it is determined that the duration exceeds the preset time.
  • the driving current required by the backlight unit to emit light in the next frame also needs to be determined according to the target grayscale value.
  • step S1022 it further includes:
  • Target driving current determination step S103 Determine the target driving current output to the backlight unit according to the target grayscale value.
  • the driving current output to the backlight unit can be adjusted by adjusting the duty cycle of the electrical signal output to the backlight unit.
  • step S103 further includes:
  • Reset signal output step S104 output a reset signal
  • step S105 according to the reset signal, return to execute the step of obtaining the duration for which the current driving current output to the backlight unit exceeds the preset current value within a frame time.
  • the above-mentioned low-level alarm signal will jump to a high-level shutdown signal, and after the current driving current of the next frame of the backlight unit exceeds the preset current value, the high-level alarm signal will be turned off.
  • the shutdown signal will jump to a low level alarm signal again.
  • the present invention provides a grayscale control method, which includes: within a frame time, acquiring the duration for which the current driving current output to the backlight unit exceeds a preset current value, and then, according to the duration
  • the grayscale value of the backlight unit is adjusted to the target grayscale value over time, and the grayscale control method provided by the present invention adjusts the value of the backlight unit according to the duration of the current drive current in the backlight unit exceeding the preset current value according to the current frame.
  • the gray-scale value is adjusted to the target gray-scale value, thereby adjusting the driving current of the backlight unit when emitting light in the next frame, and effectively avoiding the problem that the working power of the backlight unit exceeds the specification.
  • FIG. 3 is a schematic structural diagram of a display panel 10 according to an embodiment of the present invention.
  • the above-mentioned grayscale control method is applied to the display panel 10 .
  • the display panel 10 includes a backlight unit 11 , a driving circuit 12 and a grayscale output module 13 , wherein:
  • the driving circuit 12 is electrically connected to the backlight unit 11 for driving the backlight unit 11;
  • the grayscale output module 13 is electrically connected to the driving circuit 12 for determining to provide the driving circuit 12 with the target grayscale required for driving the backlight unit 11 to emit light according to the duration of the current driving current output to the backlight unit 11 exceeding the preset current value. order value.
  • the target grayscale value is smaller. After the grayscale value of the backlight unit 11 is adjusted to the target grayscale value, the driving current inside the backlight unit 11 will be smaller. It can be reduced, so that the problem that the power of the backlight unit 11 exceeds the specification when the backlight unit 11 emits light in the next frame can be avoided.
  • FIG. 4 is a schematic diagram of a detailed structure of the display panel 10 according to an embodiment of the present invention.
  • the driving circuit 12 is further provided with a detection unit 14 and a detection resistor R
  • the grayscale output module 13 is provided with a power supply unit 15
  • the display panel 10 further includes a power supply board 16, wherein:
  • the power supply board 16 is electrically connected to the power supply access port V in the drive circuit 12 to supply power to the drive circuit 12, and the detection resistor R is electrically connected between the power supply board 16 and the power supply access port V;
  • the detection unit 14 is electrically connected to both ends of the detection resistor R, and the detection unit 14 determines the current driving current according to the resistance value of the detection resistor R and the voltage at both ends of the detection resistor R, and the detection unit 14 detects that the current driving current exceeds the preset current.
  • the value is equal to 1, it will output an alarm signal to the grayscale output module 13, so that the grayscale output module 13 determines that the sum of the durations of the alarm signal appearing in one frame time is the above-mentioned duration;
  • the power supply unit 15 in the grayscale output module 13 is used to supply power to the detection unit 14, and an exemplary voltage used by the power supply unit 15 to supply power to the detection unit 14 is 3V. Further, after one frame time ends, the grayscale output module 13 also outputs a reset signal to the detection unit 14 so that the detection unit 14 stops outputting the alarm signal.
  • the detection unit 14 when the current driving current has not exceeded the preset current value, the detection unit 14 will output a high-level turn-off signal, and when the current driving current exceeds the preset current value, The high-level shutdown signal output by the detection unit 14 will jump to a low-level alarm signal.
  • the alarm signal may also be a high-level signal, that is, in the deformation
  • the shutdown signal is a low level signal.
  • a frame is divided into several subfields of equal duration, and the above-mentioned alarm signal may appear continuously in several adjacent subfields, or intermittently in several nonadjacent subfields.
  • the duration can be obtained by calculating the sum of the number of subfields in which the alarm signal appears.
  • a frame is also divided into several subfields with different durations. When calculating the sum of the number of subfields in which the alarm signal appears, it is necessary to perform a weighted calculation according to a preset formula to obtain the duration.
  • the manner of obtaining the above-mentioned duration may also be that the grayscale output module 13 records the time respectively when the above-mentioned current driving current exceeds the preset current value and when the above-mentioned current driving current decreases to be lower than the preset current value, Finally, the duration is obtained by calculating the difference between the recorded times. Besides, the grayscale output module 13 can also use all the time remaining in the current frame as the duration after the current driving current exceeds the preset current value.
  • the number of driving circuits 12 is one, and in other modifications made by the present invention, the number of driving circuits 12 may be multiple, and different driving circuits 12 are electrically connected, and the power supply
  • the board 16 provides the plurality of driving circuits 12 with voltages required to drive the corresponding backlight units 11
  • the power board 16 provides the plurality of driving circuits 12 with an exemplary voltage of 30V required to drive the corresponding backlight units 11 .
  • the present invention provides a display panel 10, comprising: a backlight unit 11, a drive circuit 12 electrically connected to the backlight unit 11 and used to drive the backlight unit 11, electrically connected to the drive circuit 12 and used to drive the backlight unit 11 according to
  • the current driving current output to the backlight unit 11 exceeds the duration of the preset current value
  • the grayscale output module 13 that provides the driving circuit 12 with the target grayscale value required to drive the backlight unit 11 to emit light is determined.
  • the display panel provided by the present invention The grayscale output module 13 in 10 adjusts the grayscale value of the backlight unit 11 to the target grayscale value according to the duration for which the current driving current in the backlight unit 11 of the current frame exceeds the preset current value, thereby adjusting the backlight unit.
  • the driving current of 11 when emitting light in the next frame effectively avoids the problem that the working power of the backlight unit 11 exceeds the specification.
  • FIG. 5 is a schematic structural diagram of a mobile terminal provided according to an embodiment of the present invention.
  • the above-mentioned display panel 10 is applied to the mobile terminal.
  • the mobile terminal may be a smart phone or a tablet computer. From the figure It can be seen intuitively that each component of the present invention and the relative positional relationship of each component.
  • the mobile terminal 100 includes a processor 101 and a memory 102 .
  • the processor 101 is electrically connected to the memory 102 .
  • the processor 101 is the control center of the mobile terminal 100, uses various interfaces and lines to connect various parts of the entire mobile terminal, and executes the mobile operation by running or loading the application program stored in the memory 102 and calling the data stored in the memory 102. Various functions of the terminal and processing data, so as to monitor the mobile terminal as a whole.
  • FIG. 6 is a schematic diagram of a detailed structure of a mobile terminal provided by an embodiment of the present invention.
  • the mobile terminal can be a smart phone or a tablet computer.
  • Each component, and the relative positional relationship of each component are described in detail below.
  • FIG. 6 shows a specific structural block diagram of the mobile terminal 100 provided by an embodiment of the present invention.
  • the mobile terminal 100 may include a radio frequency (RF, Radio Frequency) circuit 110 , a memory 120 including one or more computer-readable storage media, an input unit 130 , a display unit 140 , a sensor 150 , and an audio circuit 160.
  • a transmission module 170 (such as wireless fidelity, WiFi, Wireless Fidelity), a processor 180 including one or more processing cores, a power supply 190 and other components.
  • RF Radio Frequency
  • a transmission module 170 such as wireless fidelity, WiFi, Wireless Fidelity
  • a processor 180 including one or more processing cores
  • a power supply 190 a power supply 190
  • the RF circuit 110 is used for receiving and sending electromagnetic waves, realizing mutual conversion between electromagnetic waves and electrical signals, so as to communicate with a communication network or other devices.
  • RF circuitry 110 may include various existing circuit components for performing these functions, eg, antennas, radio frequency transceivers, digital signal processors, encryption/decryption chips, subscriber identity module (SIM) cards, memory, and the like.
  • the RF circuit 110 may communicate with various networks such as the Internet, an intranet, a wireless network, or with other devices over a wireless network.
  • the aforementioned wireless network may include a cellular telephone network, a wireless local area network, or a metropolitan area network.
  • the above-mentioned wireless networks can use various communication standards, protocols and technologies, including but not limited to the Global System for Mobile Communications (Global System for Mobile Communication, GSM), Enhanced Mobile Communication Technology (Enhanced Data GSM Environment, EDGE), Wideband Code Division Multiple Access (Wideband Code Division Multiple Access, WCDMA), code division multiple access technology (Code Division Access, CDMA), Time Division Multiple Access (TDMA), Wireless Fidelity (Wireless Fidelity, Wi-Fi) (e.g.
  • GSM Global System for Mobile Communication
  • EDGE Enhanced Mobile Communication Technology
  • WCDMA Wideband Code Division Multiple Access
  • CDMA Code Division Multiple Access
  • TDMA Time Division Multiple Access
  • Wireless Fidelity Wireless Fidelity
  • Wi-Fi Wireless Fidelity
  • IEEE 802.11a Institute of Electrical and Electronics Engineers standards IEEE 802.11a, IEEE 802.11b, IEEE802.11g and/or IEEE 802.11n
  • Internet telephony VoIP over Internet Protocol, VoIP
  • Worldwide Interconnection for Microwave Access Worldwide Interoperability for Microwave Access, Wi-Max
  • other protocols for mail, instant messaging, and short messaging and any other suitable communication protocols, even those that are not currently being developed.
  • the memory 120 can be used to store software programs and modules, such as the corresponding program instructions in the above-mentioned audio power amplifier control method.
  • the processor 180 executes various functional applications and data processing by running the software programs and modules stored in the memory 120.
  • the frequency of the information transmission signal transmitted by the mobile terminal 100 is acquired. Generate jamming signals and other functions.
  • Memory 120 may include high-speed random access memory, and may also include non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory.
  • the memory 120 may further include memory disposed remotely with respect to the processor 180, and these remote memories may be connected to the mobile terminal 100 through a network. Examples of such networks include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.
  • the input unit 130 may be used to receive input numerical or character information, and generate keyboard, mouse, joystick, optical or trackball signal input related to user settings and function control.
  • the input unit 130 may include a touch-sensitive surface 131 as well as other input devices 132 .
  • Touch-sensitive surface 131 also known as a touch display or trackpad, collects touch operations by a user on or near it (such as a user using a finger, stylus, etc., any suitable object or accessory on or on touch-sensitive surface 131). operations near the touch-sensitive surface 131 ), and drive the corresponding connection device according to a preset program.
  • the touch-sensitive surface 131 may include two parts, a touch detection device and a touch controller.
  • the touch detection device detects the user's touch orientation, detects the signal brought by the touch operation, and transmits the signal to the touch controller; the touch controller receives the touch information from the touch detection device, converts it into contact coordinates, and then sends it to the touch controller.
  • the touch-sensitive surface 131 may be implemented using resistive, capacitive, infrared, and surface acoustic wave types.
  • the input unit 130 may also include other input devices 132 .
  • other input devices 132 may include, but are not limited to, one or more of physical keyboards, function keys (such as volume control keys, switch keys, etc.), trackballs, mice, joysticks, and the like.
  • the display unit 140 may be used to display information input by or provided to the user and various graphical user interfaces of the mobile terminal 100, which may be composed of graphics, text, icons, videos, and any combination thereof.
  • the display unit 140 may include a display panel 141, and optionally, an LCD (Liquid
  • the display panel 141 is configured in the form of Crystal Display, liquid crystal display), OLED (Organic Light-Emitting Diode, organic light emitting diode) and the like.
  • the touch-sensitive surface 131 may cover the display panel 141, and when the touch-sensitive surface 131 detects a touch operation on or near it, it is transmitted to the processor 180 to determine the type of the touch event, and then the processor 180 determines the type of the touch event according to the touch event.
  • Type provides corresponding visual output on display panel 141 .
  • the touch-sensitive surface 131 and the display panel 141 are used as two separate components to realize the input and output functions, in some embodiments, the touch-sensitive surface 131 and the display panel 141 may be integrated to realize the input and output functions. output function.
  • the mobile terminal 100 may further include at least one sensor 150, such as a light sensor, a motion sensor, and other sensors.
  • the light sensor may include an ambient light sensor and a proximity sensor, wherein the ambient light sensor may adjust the brightness of the display panel 141 according to the brightness of the ambient light, and the proximity sensor may generate an interruption when the flip is closed or closed.
  • the gravitational acceleration sensor can detect the magnitude of acceleration in all directions (usually three axes), and can detect the magnitude and direction of gravity when it is stationary. games, magnetometer attitude calibration), vibration recognition related functions (such as pedometer, tapping), etc.; as for other sensors such as gyroscope, barometer, hygrometer, thermometer, infrared sensor, etc. that can also be configured on the mobile terminal 100, here No longer.
  • the audio circuit 160 , the speaker 161 , and the microphone 162 may provide an audio interface between the user and the mobile terminal 100 .
  • the audio circuit 160 can transmit the received audio data converted electrical signal to the speaker 161, and the speaker 161 converts it into a sound signal for output; on the other hand, the microphone 162 converts the collected sound signal into an electrical signal, which is converted by the audio circuit 160 After receiving, it is converted into audio data, and then the audio data is output to the processor 180 for processing, and then sent to, for example, another terminal through the RF circuit 110, or the audio data is output to the memory 120 for further processing.
  • the audio circuit 160 may also include an earphone jack to provide communication between a peripheral earphone and the mobile terminal 100 .
  • the mobile terminal 100 can help the user to receive requests, send information, etc. through the transmission module 170 (eg, a Wi-Fi module), which provides the user with wireless broadband Internet access.
  • the transmission module 170 eg, a Wi-Fi module
  • the transmission module 170 is shown in the figure, it is understood that it does not belong to the essential structure of the mobile terminal 100, and can be completely omitted within the scope of not changing the essence of the invention as required.
  • the processor 180 is the control center of the mobile terminal 100, uses various interfaces and lines to connect various parts of the entire mobile phone, runs or executes the software programs and/or modules stored in the memory 120, and calls the data stored in the memory 120. , perform various functions of the mobile terminal 100 and process data, so as to perform overall monitoring of the mobile terminal.
  • the processor 180 may include one or more processing cores; in some embodiments, the processor 180 may integrate an application processor and a modem processor, wherein the application processor mainly handles the operating system, user interface and Applications, etc., the modem processor mainly deals with wireless communication. It can be understood that the above-mentioned modulation and demodulation processor may not be integrated into the processor 180 .
  • the mobile terminal 100 also includes a power source 190 (such as a battery) for powering various components.
  • the power source can be logically connected to the processor 180 through a power management system, so as to manage charging, discharging, and power consumption through the power management system. management and other functions.
  • Power supply 190 may also include one or more DC or AC power sources, recharging systems, power failure detection circuits, power converters or inverters, power status indicators, and any other components.
  • the mobile terminal 100 further includes a camera (eg, a front camera, a rear camera, etc.), a Bluetooth module, a flashlight, and the like, which will not be repeated here.
  • the display unit of the mobile terminal 100 is a touch screen display.

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Abstract

本发明提供了一种灰阶控制方法以及显示面板，应用于包括背光单元的显示面板，该灰阶控制方法包括：在一帧时间内，获取输出至背光单元中的当前驱动电流超过预设电流值的持续时间，之后，根据所述持续时间将所述背光单元的灰阶值调整为目标灰阶值。

Description

灰阶控制方法以及显示面板 技术领域
本发明涉及通讯技术领域，尤其涉及一种灰阶控制方法以及显示面板。
 背景技术
由于Mini-LED灯珠具有长寿命、高亮度、低功耗、体积较小以及超高分辨率等特点，Mini-LED灯珠已经被广泛地应用于显示面板的背光模组中。
但是，现有技术下，通常使用恒定电压驱动Mini-LED灯珠，而当Mini-LED灯珠连续使用较长时间后，会因为发热而使其内部的驱动电流过大，由此导致其工作时的功率超规。
 技术问题
本发明提供了一种灰阶控制方法以及显示面板，有效地解决了因使用恒定电压驱动背光单元，而使其在长时间工作后由于发热而产生过大的驱动电流，进而导致其工作功率超规的问题。
 技术解决方案
一方面，本发明提供了一种灰阶控制方法，应用于包括背光单元的显示面板，所述灰阶控制方法包括：
在一帧时间内，获取输出至所述背光单元中的当前驱动电流超过预设电流值的持续时间；
根据所述持续时间将所述背光单元的灰阶值调整为目标灰阶值。
进一步优选的，所述获取输出至所述背光单元中的当前驱动电流超过预设电流值的持续时间的步骤，具体包括：
当输出至所述背光单元中的当前驱动电流超过预设电流值时，输出告警信号；
确定所述告警信号在所述一帧时间内出现的时长总和为所述当前驱动电流超过预设电流值的持续时间。
进一步优选的，所述一帧时间包括多个子场，所述告警信号出现于相邻的多个所述子场内，及/或所述告警信号出现于不相邻的多个所述子场内。
进一步优选的，多个所述子场的时长相等，及/或多个所述子场的时长不相等。
进一步优选的，当多个所述子场的时长不相等时，所述确定所述告警信号在所述一帧时间内出现的时长总和为所述当前驱动电流超过预设电流值的持续时间的步骤，具体包括：
确定在所述一帧时间内出现所述告警信号的子场为目标子场；
根据预设公式以及所述目标子场的时长进行加权计算，以确定所述当前驱动电流超过预设电流值的持续时间。
进一步优选的，所述根据所述持续时间将所述背光单元的灰阶值调整为目标灰阶值的步骤，具体包括：
当所述持续时间超过预设时间时，获取灰阶值查找表，所述灰阶值查找表包括多个标定持续时间与多个灰阶值的映射信息；
根据所述灰阶值查找表确定所述持续时间对应的灰阶值，作为目标灰阶值。
进一步优选的，在所述根据所述持续时间将所述背光单元的灰阶值调整为目标灰阶值的步骤之后，还包括：
根据所述目标灰阶值确定输出至所述背光单元的目标驱动电流。
进一步优选的，在所述根据所述目标灰阶值确定输出至所述背光单元的目标驱动电流的步骤之后，还包括：
输出重置信号；
根据所述重置信号返回执行所述在一帧时间内，获取输出至所述背光单元中的当前驱动电流超过预设电流值的持续时间的步骤。
另一方面，本发明还提供了一种显示面板，所述显示面板包括：
背光单元；
至少一个驱动电路，与所述背光单元电连接，用以驱动所述背光单元；
灰阶输出模块，与所述驱动电路电连接，用以根据输出至所述背光单元的当前驱动电流超过预设电流值的持续时间，而确定向所述驱动电路提供驱动所述背光单元发光所需的目标灰阶值。
进一步优选的，所述显示面板还包括检测单元，所述检测单元用以在所述当前驱动电流超过所述预设电流值时，向所述灰阶输出模块输出告警信号，而使所述灰阶输出模块确定所述告警信号在一帧时间内出现的时长总和为所述持续时间。
进一步优选的，所述一帧时间包括多个子场，所述告警信号出现于相邻的多个所述子场内，及/或所述告警信号出现于不相邻的多个所述子场内。
进一步优选的，多个所述子场的时长相等，及/或多个所述子场的时长不相等。
进一步优选的，当多个所述子场的时长不相等时，所述检测单元用以确定在所述一帧时间内出现所述告警信号的子场为目标子场，并根据预设公式以及所述目标子场的时长进行加权计算，以确定所述当前驱动电流超过预设电流值的持续时间。
进一步优选的，所述灰阶输出模块还用以在所述一帧时间结束后，输出重置信号至所述检测单元，而使所述检测单元停止输出所述告警信号。
进一步优选的，于所述驱动电路上设置有检测电阻，所述检测单元电连接于所述检测电阻的两端，所述检测单元根据所述检测电阻的阻值以及所述检测电阻两端的电压确定所述当前驱动电流。
进一步优选的，所述灰阶输出模块还包括供电单元，所述供电单元用以向所述检测单元供电。
另一方面，本发明还提供了一种移动终端，所述移动终端包括显示面板，所述显示面板包括：
背光单元；
至少一个驱动电路，与所述背光单元电连接，用以驱动所述背光单元；
灰阶输出模块，与所述驱动电路电连接，用以根据输出至所述背光单元的当前驱动电流超过预设电流值的持续时间，而确定向所述驱动电路提供驱动所述背光单元发光所需的目标灰阶值。
进一步优选的，所述显示面板还包括检测单元，所述检测单元用以在所述当前驱动电流超过所述预设电流值时，向所述灰阶输出模块输出告警信号，而使所述灰阶输出模块确定所述告警信号在一帧时间内出现的时长总和为所述持续时间。
进一步优选的，所述一帧时间包括多个子场，所述告警信号出现于相邻的多个所述子场内，及/或所述告警信号出现于不相邻的多个所述子场内。
进一步优选的，多个所述子场的时长相等，及/或多个所述子场的时长不相等。
 有益效果
本发明提供了一种灰阶控制方法，应用于包括背光单元的显示面板，该灰阶控制方法包括：在一帧时间内，获取输出至背光单元中的当前驱动电流超过预设电流值的持续时间，之后，根据所述持续时间将所述背光单元的灰阶值调整为目标灰阶值，本发明提供的灰阶控制方法通过根据当前帧背光单元中的当前驱动电流超过预设电流值的持续时间，而将背光单元的灰阶值调整为目标灰阶值，从而调整了背光单元在下一帧发光时的驱动电流，有效地避免了背光单元工作功率超规的问题出现。
 附图说明
为了更清楚地说明本发明的技术方案，下面将对根据本发明而成的各实施例描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本发明的一些实施例，对于本领域技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。
图1是根据本发明而成的实施例所提供的灰阶控制方法的流程示意图。
图2是根据本发明而成的实施例所提供的灰阶控制方法的进一步流程示意图。
图3是根据本发明而成的实施例所提供的显示面板的结构示意图。
图4是根据本发明而成的实施例所提供的显示面板的细部结构示意图。
图5是根据本发明而成的实施例所提供的移动终端的结构示意图。
图6是根据本发明而成的实施例所提供的移动终端的细部结构示意图。
 本发明的实施方式
下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述。显然，所描述的实施例仅仅是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域技术人员在没有作出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。
在本发明的描述中，需要理解的是，术语“中心”、“纵向”、“横向”、“长度”、“宽度”、“厚度”、“上”、“下”、“前”、“后”、“左”、“右”、“竖直”、“水平”、“顶”、“底”、“内”、“外”、“顺时针”、“逆时针”等指示的方位或位置关系为基于附图所示的方位或位置关系，仅是为了便于描述本发明和简化描述，而不是指示或暗示所指的装置或元件必须具有特定的方位、以特定的方位构造和操作，因此不能理解为对本发明的限制。此外，术语“第一”、“第二”仅用于描述目的，而不能理解为指示或暗示相对重要性或者隐含指明所指示的技术特征的数量。由此，限定有“第一”、“第二”的特征可以明示或者隐含地包括一个或者更多个所述特征。在本发明的描述中，“多个”的含义是两个或两个以上，除非另有明确具体的限定。
在本发明的描述中，需要说明的是，除非另有明确的规定和限定，术语“安装”、“相连”、“连接”应做广义理解，例如，可以是固定连接，也可以是可拆卸连接，或一体地连接；可以是机械连接，也可以是电连接或可以相互通讯；可以是直接相连，也可以通过中间媒介间接相连，可以是两个元件内部的连通或两个元件的相互作用关系。对于本领域的普通技术人员而言，可以根据具体情况理解上述术语在本发明中的具体含义。
在本发明中，除非另有明确的规定和限定，第一特征在第二特征之“上”或之“下”可以包括第一和第二特征直接接触，也可以包括第一和第二特征不是直接接触而是通过它们之间的另外的特征接触。而且，第一特征在第二特征“之上”、“上方”和“上面”包括第一特征在第二特征正上方和斜上方，或仅仅表示第一特征水平高度高于第二特征。第一特征在第二特征“之下”、“下方”和“下面”包括第一特征在第二特征正下方和斜下方，或仅仅表示第一特征水平高度小于第二特征。
下文的公开提供了许多不同的实施方式或例子用来实现本发明的不同结构。为了简化本发明的公开，下文中对特定例子的部件和设置进行描述。当然，它们仅仅为示例，并且目的不在于限制本发明。此外，本发明可以在不同例子中重复参考数字和/或参考字母，这种重复是为了简化和清楚的目的，其本身不指示所讨论各种实施方式和/或设置之间的关系。此外，本发明提供了的各种特定的工艺和材料的例子，但是本领域普通技术人员可以意识到其他工艺的应用和/或其他材料的使用。
本发明针对现有的显示面板中的背光单元，因被恒定电压驱动，在长时间工作后会由于发热而产生过大的驱动电流，进而出现背光单元工作功率超规的问题，根据本发明而成的实施例用以解决该问题。
为了解决上述问题，本发明提供了一种灰阶控制方法，请参阅图1，图1是根据本发明而成的实施例所提供的灰阶控制方法的流程示意图，该灰阶控制方法应用于包括背光单元的显示面板。根据本发明而成的实施例所提供的灰阶控制方法的具体流程可以如下：
获取步骤S101：在一帧时间内，获取输出至背光单元中的当前驱动电流超过预设电流值的持续时间。
容易理解的是，随着背光单元工作时间的增长，其内部的驱动电流会因为背光单元的发热而增大，当背光单元中的当前驱动电流超过预设电流值的时间过长时，背光单元的工作功率会超规，进而导致显示面板显示出的画面过亮。
需要说明的是，在本实施例中，可以在上述当前驱动电流超过预设电流值后向系统进行告警，之后，根据告警的信息来获取上述持续时间。
例如，请参阅图2，图2是根据本发明而成的实施例所提供的灰阶控制方法的进一步流程示意图，上述获取步骤S101具体可以包括：
告警信号输出步骤S1011：在一帧时间内，当输出至背光单元中的当前驱动电流超过预设电流值时，输出告警信号；
持续时间确定步骤S1012：确定告警信号在一帧时间内出现的时长总和为当前驱动电流超过预设电流值的持续时间。
容易理解的是，在本实施例中，当上述当前驱动电流还未超过预设电流值时，系统会输出一高电平关断信号，当上述当前驱动电流超过预设电流值后，该高电平关断信号会跳变为低电平告警信号，在由本发明而成的其他实施例中，该告警信号也可以是一高电平信号，即，在该变形例中，关断信号为低电平信号。
需要说明的是，通常情况下，会将一帧划分为若干个时长相等的子场，上述告警信号可以连续出现在相邻的若干子场内，也可以间断地出现在不相邻的若干子场内，通过计算该告警信号出现的子场数的总和，即可得到持续时间。除此之外，在一些可能的变形例中，也会将一帧划分为若干个时长不等的子场，此时，由于每一子场在一帧内所占时间的权重不等，在计算告警信号出现的子场数的总和时，需要按照预设公式进行加权计算来得到持续时间。
进一步地，获取上述持续时间的方式还可以是，系统在上述当前驱动电流超过预设电流值时、以及上述当前驱动电流降低到低于预设电流值时，分别记录下时间，最后通过计算记录下的时间之差得到持续时间。除此之外，系统也可以将上述当前驱动电流超过预设电流值后，当前帧内剩余的所有时间作为持续时间。
调整步骤S102：根据持续时间将背光单元的灰阶值调整为目标灰阶值。
容易理解的是，与当前驱动电流所对应的灰阶值相比，目标灰阶值更小，在将背光单元的灰阶值调整为目标灰阶值后，背光单元内部的驱动电流会得以减小，从而可以避免背光单元在下一帧发光时发生功率超规的问题。
需要说明的是，可以预先在系统内保存一记录有多个标定持续时间与多个灰阶值的映射信息的灰阶值查找表，在进行上述调整步骤S102时，通过调用该灰阶值查找表来调整背光单元的灰阶值。
例如，请继续参阅图2，上述调整步骤S102具体可以包括：
灰阶值查找表获取步骤S1021：当持续时间超过预设时间时，获取灰阶值查找表，灰阶值查找表包括多个标定持续时间与多个灰阶值的映射信息；
目标灰阶值确定步骤S1022：根据灰阶值查找表确定持续时间对应的灰阶值，作为目标灰阶值。
容易理解的是，灰阶查找表所保存的多个标定持续时间与多个灰阶值的映射信息，可以是一个标定持续时间对应一个灰阶值，也可以是一个标定持续时间段对应一个灰阶值。
进一步地，判断上述持续时间是否超过预设时间的方式，可以是通过判断出现上述告警信号的子场总数是否超过预设数量，若是，则确定持续时间超过了预设时间。
需要说明的是，在将背光单元的灰阶值调整为目标灰阶值后，还需要根据该目标灰阶值确定背光单元在下一帧发光时所需的驱动电流。
例如，请继续参阅图2，在上述目标灰阶值确定步骤S1022之后，还包括：
目标驱动电流确定步骤S103：根据目标灰阶值确定输出至背光单元的目标驱动电流。
容易理解的是，不同的灰阶值对应有不同的驱动电流，当系统输出的电流值一定时，可以通过调节输出给背光单元的电信号的占空比来调整输出至背光单元的驱动电流。
进一步地，请继续参阅图2，在上述目标驱动电流确定步骤S103之后，还包括：
重置信号输出步骤S104：输出重置信号；
返回执行步骤S105：根据重置信号返回执行在一帧时间内，获取输出至背光单元中的当前驱动电流超过预设电流值的持续时间的步骤。
容易理解的是，在输出重置信号后，上述低电平告警信号会跳变为高电平关断信号，并在背光单元下一帧的当前驱动电流超过预设电流值后，高电平关断信号才会再次跳变为低电平告警信号。
区别于现有技术，本发明提供了一种灰阶控制方法，包括：在一帧时间内，获取输出至背光单元中的当前驱动电流超过预设电流值的持续时间，之后，根据所述持续时间将所述背光单元的灰阶值调整为目标灰阶值，本发明提供的灰阶控制方法通过根据当前帧背光单元中的当前驱动电流超过预设电流值的持续时间，而将背光单元的灰阶值调整为目标灰阶值，从而调整了背光单元在下一帧发光时的驱动电流，有效地避免了背光单元工作功率超规的问题出现。
请参阅图3，图3是根据本发明而成的实施例所提供的显示面板10的结构示意图，上述灰阶控制方法应用于该显示面板10，从图3中可以很直观的看到根据本发明而成的实施例的各组成部分，以及各组成部分的相对位置关系。
如图3所示，该显示面板10包括背光单元11、驱动电路12以及灰阶输出模块13，其中：
驱动电路12与背光单元11电连接，用以驱动背光单元11；
灰阶输出模块13与驱动电路12电连接，用以根据输出至背光单元11的当前驱动电流超过预设电流值的持续时间，而确定向驱动电路12提供驱动背光单元11发光所需的目标灰阶值。
容易理解的是，与当前驱动电流所对应的灰阶值相比，目标灰阶值更小，在将背光单元11的灰阶值调整为目标灰阶值后，背光单元11内部的驱动电流会得以减小，从而可以避免背光单元11在下一帧发光时发生功率超规的问题。
进一步地，请参阅图4，图4是根据本发明而成的实施例所提供的显示面板10的细部结构示意图，如图4所示，驱动电路12上还设置有检测单元14以及检测电阻R，灰阶输出模块13中设置有供电单元15，显示面板10还包括电源板16，其中：
电源板16与驱动电路12中的电源接入端口V电连接，用以向驱动电路12供电，检测电阻R电连接在电源板16与电源接入端口V之间；
检测单元14电连接于检测电阻R的两端，检测单元14会根据检测电阻R的阻值以及检测电阻R两端的电压而确定当前驱动电流，在检测单元14测得当前驱动电流超过预设电流值时，其会向灰阶输出模块13输出告警信号，而使灰阶输出模块13确定告警信号在一帧时间内出现的时长总和为上述持续时间；
灰阶输出模块13中的供电单元15用以向检测单元14供电，且供电单元15用以向检测单元14供电的示例性电压为3V，进一步地，在一帧时间结束后，灰阶输出模块13还会输出重置信号至检测单元14，而使检测单元14停止输出告警信号。
容易理解的是，在本实施例中，当上述当前驱动电流还未超过预设电流值时，检测单元14会输出一高电平关断信号，当上述当前驱动电流超过预设电流值后，检测单元14输出的该高电平关断信号会跳变为低电平告警信号，在由本发明而成的其他实施例中，该告警信号也可以是一高电平信号，即，在该变形例中，关断信号为低电平信号。
需要说明的是，通常情况下，会将一帧划分为若干个时长相等的子场，上述告警信号可以连续出现在相邻的若干子场内，也可以间断地出现在不相邻的若干子场内，通过计算该告警信号出现的子场数的总和，即可得到持续时间。除此之外，在一些可能的变形例中，也会将一帧划分为若干个时长不等的子场，此时，由于每一子场在一帧内所占时间的权重不等，在计算告警信号出现的子场数的总和时，需要按照预设公式进行加权计算来得到持续时间。
进一步地，获取上述持续时间的方式还可以是，灰阶输出模块13在上述当前驱动电流超过预设电流值时、以及上述当前驱动电流降低到低于预设电流值时，分别记录下时间，最后通过计算记录下的时间之差得到持续时间。除此之外，灰阶输出模块13也可以将上述当前驱动电流超过预设电流值后，当前帧内剩余的所有时间作为持续时间。
进一步地，在本实施例中，驱动电路12的数量为一个，在由本发明而成的其他变形例中，驱动电路12的数量可以是多个，不同的驱动电路12之间电连接，且电源板16会向多个驱动电路12提供驱动对应的背光单元11所需的电压，电源板16向多个驱动电路12提供驱动对应的背光单元11所需的示例性电压为30V。
区别于现有技术，本发明提供了一种显示面板10，包括：背光单元11，与背光单元11电连接、并用以驱动背光单元11的驱动电路12，与驱动电路12电连接、并用以根据输出至背光单元11的当前驱动电流超过预设电流值的持续时间，而确定向驱动电路12提供驱动背光单元11发光所需的目标灰阶值的灰阶输出模块13，本发明提供的显示面板10中的灰阶输出模块13会根据当前帧背光单元11中的当前驱动电流超过预设电流值的持续时间，而将背光单元11的灰阶值调整为目标灰阶值，从而调整了背光单元11在下一帧发光时的驱动电流，有效地避免了背光单元11工作功率超规的问题出现。
请参阅图5，图5是根据本发明而成的实施例所提供的移动终端的结构示意图，上述显示面板10应用于该移动终端，该移动终端可以为智能手机或平板电脑等，从图中可以很直观的看到本发明的各组成部分，以及各组成部分的相对位置关系。
如图5所示，移动终端100包括处理器101、存储器102。其中，处理器101与存储器102电性连接。
处理器101是移动终端100的控制中心，利用各种接口和线路连接整个移动终端的各个部分，通过运行或加载存储在存储器102内的应用程序，以及调用存储在存储器102内的数据，执行移动终端的各种功能和处理数据，从而对移动终端进行整体监控。
请参阅图6，图6是根据本发明而成的实施例所提供的移动终端的细部结构示意图，该移动终端可以为智能手机或平板电脑等，从图中可以很直观的看到本发明的各组成部分，以及各组成部分的相对位置关系。
图6示出了本发明实施例提供的移动终端100的具体结构框图。如图6所示，该移动终端100可以包括射频(RF，Radio Frequency)电路110、包括有一个或一个以上计算机可读存储介质的存储器120、输入单元130、显示单元140、传感器150、音频电路160、传输模块170（例如无线保真，WiFi，Wireless Fidelity)、包括有一个或者一个以上处理核心的处理器180、以及电源190等部件。本领域技术人员可以理解，图6中示出的移动终端结构并不构成对移动终端的限定，可以包括比图示更多或更少的部件，或者组合某些部件，或者不同的部件布置。
RF电路110用于接收以及发送电磁波，实现电磁波与电信号的相互转换，从而与通讯网络或者其他设备进行通讯。RF电路110可包括各种现有的用于执行这些功能的电路组件，例如，天线、射频收发器、数字信号处理器、加密/解密芯片、用户身份模块（SIM）卡、存储器等等。RF电路110可与各种网络如互联网、企业内部网、无线网络进行通讯或者通过无线网络与其他设备进行通讯。上述的无线网络可包括蜂窝式电话网、无线局域网或者城域网。上述的无线网络可以使用各种通信标准、协议及技术，包括但并不限于全球移动通信系统（Global System for Mobile Communication, GSM）、增强型移动通信技术（Enhanced Data GSM Environment, EDGE)，宽带码分多址技术（Wideband Code Division Multiple Access, WCDMA），码分多址技术（Code Division Access, CDMA）、时分多址技术（Time Division Multiple Access, TDMA），无线保真技术（Wireless Fidelity， Wi-Fi）（如美国电气和电子工程师协会标准 IEEE 802.11a， IEEE 802.11b, IEEE802.11g 和/或 IEEE 802.11n）、网络电话（Voice over Internet Protocol, VoIP）、全球微波互联接入（Worldwide Interoperability for Microwave Access， Wi-Max）、其他用于邮件、即时通讯及短消息的协议，以及任何其他合适的通讯协议，甚至可包括那些当前仍未被开发出来的协议。
存储器120可用于存储软件程序以及模块，如上述音频功放控制方法中对应的程序指令，处理器180通过运行存储在存储器120内的软件程序以及模块，从而执行各种功能应用以及数据处理，即实现获取移动终端100带传输的信息传输信号的频率。生成干扰信号等功能。存储器120可包括高速随机存储器，还可包括非易失性存储器，如一个或者多个磁性存储装置、闪存、或者其他非易失性固态存储器。在一些实例中，存储器120可进一步包括相对于处理器180远程设置的存储器，这些远程存储器可以通过网络连接至移动终端100。上述网络的实例包括但不限于互联网、企业内部网、局域网、移动通信网及其组合。
输入单元130可用于接收输入的数字或字符信息，以及产生与用户设置以及功能控制有关的键盘、鼠标、操作杆、光学或者轨迹球信号输入。具体地，输入单元130可包括触敏表面131以及其他输入设备132。触敏表面131，也称为触摸显示屏或者触控板，可收集用户在其上或附近的触摸操作（比如用户使用手指、触笔等任何适合的物体或附件在触敏表面131上或在触敏表面131附近的操作），并根据预先设定的程序驱动相应的连接装置。可选的，触敏表面131可包括触摸检测装置和触摸控制器两个部分。其中，触摸检测装置检测用户的触摸方位，并检测触摸操作带来的信号，将信号传送给触摸控制器；触摸控制器从触摸检测装置上接收触摸信息，并将它转换成触点坐标，再送给处理器180，并能接收处理器180发来的命令并加以执行。此外，可以采用电阻式、电容式、红外线以及表面声波等多种类型实现触敏表面131。除了触敏表面131，输入单元130还可以包括其他输入设备132。具体地，其他输入设备132可以包括但不限于物理键盘、功能键（比如音量控制按键、开关按键等）、轨迹球、鼠标、操作杆等中的一种或多种。
显示单元140可用于显示由用户输入的信息或提供给用户的信息以及移动终端100的各种图形用户接口，这些图形用户接口可以由图形、文本、图标、视频和其任意组合来构成。显示单元140可包括显示面板141，可选的，可以采用LCD(Liquid Crystal Display，液晶显示器)、OLED(Organic Light-Emitting Diode,有机发光二极管)等形式来配置显示面板141。进一步的，触敏表面131可覆盖显示面板141，当触敏表面131检测到在其上或附近的触摸操作后，传送给处理器180以确定触摸事件的类型，随后处理器180根据触摸事件的类型在显示面板141上提供相应的视觉输出。虽然在图中，触敏表面131与显示面板141是作为两个独立的部件来实现输入和输出功能，但是在某些实施例中，可以将触敏表面131与显示面板141集成而实现输入和输出功能。
移动终端100还可包括至少一种传感器150，比如光传感器、运动传感器以及其他传感器。具体地，光传感器可包括环境光传感器及接近传感器，其中，环境光传感器可根据环境光线的明暗来调节显示面板141的亮度，接近传感器可在翻盖合上或者关闭时产生中断。作为运动传感器的一种，重力加速度传感器可检测各个方向上（一般为三轴）加速度的大小，静止时可检测出重力的大小及方向，可用于识别手机姿态的应用（比如横竖屏切换、相关游戏、磁力计姿态校准）、振动识别相关功能（比如计步器、敲击）等; 至于移动终端100还可配置的陀螺仪、气压计、湿度计、温度计、红外线传感器等其他传感器，在此不再赘述。
音频电路160、扬声器161，传声器162可提供用户与移动终端100之间的音频接口。音频电路160可将接收到的音频数据转换后的电信号，传输到扬声器161，由扬声器161转换为声音信号输出；另一方面，传声器162将收集的声音信号转换为电信号，由音频电路160接收后转换为音频数据，再将音频数据输出处理器180处理后，经RF电路110以发送给比如另一终端，或者将音频数据输出至存储器120以便进一步处理。音频电路160还可能包括耳塞插孔，以提供外设耳机与移动终端100的通信。
移动终端100通过传输模块170（例如Wi-Fi模块）可以帮助用户接收请求、发送信息等，它为用户提供了无线的宽带互联网访问。虽然图中示出了传输模块170，但是可以理解的是，其并不属于移动终端100的必须构成，完全可以根据需要在不改变发明的本质的范围内而省略。
处理器180是移动终端100的控制中心，利用各种接口和线路连接整个手机的各个部分，通过运行或执行存储在存储器120内的软件程序和/或模块，以及调用存储在存储器120内的数据，执行移动终端100的各种功能和处理数据，从而对移动终端进行整体监控。可选的，处理器180可包括一个或多个处理核心；在一些实施例中，处理器180可集成应用处理器和调制解调处理器，其中，应用处理器主要处理操作系统、用户界面和应用程序等，调制解调处理器主要处理无线通信。可以理解地，上述调制解调处理器也可以不集成到处理器180中。
移动终端100还包括给各个部件供电的电源190（比如电池），在一些实施例中，电源可以通过电源管理系统与处理器180逻辑相连，从而通过电源管理系统实现管理充电、放电、以及功耗管理等功能。电源190还可以包括一个或一个以上的直流或交流电源、再充电系统、电源故障检测电路、电源转换器或者逆变器、电源状态指示器等任意组件。
尽管未示出，移动终端100还包括摄像头（如前置摄像头、后置摄像头等）、蓝牙模块和手电筒等，在此不再赘述。具体在本实施例中，移动终端100的显示单元是触摸屏显示器。
除上述实施例外，本发明还可以有其他实施方式。凡采用等同替换或等效替换形成的技术方案，均落在本发明要求的保护范围。
综上所述，虽然本发明已将优选实施例揭露如上，但上述优选实施例并非用以限制本发明，本领域的普通技术人员，在不脱离本发明的精神和范围内，均可作各种更动与润饰，因此本发明的保护范围以权利要求界定的范围为准。

Claims (20)

  1. 一种灰阶控制方法，其中，应用于包括背光单元的显示面板，所述灰阶控制方法包括：
    在一帧时间内，获取输出至所述背光单元中的当前驱动电流超过预设电流值的持续时间；
    根据所述持续时间将所述背光单元的灰阶值调整为目标灰阶值。
  2. 根据权利要求1所述的灰阶控制方法，其中，所述获取输出至所述背光单元中的当前驱动电流超过预设电流值的持续时间的步骤，具体包括：
    当输出至所述背光单元中的当前驱动电流超过预设电流值时，输出告警信号；
    确定所述告警信号在所述一帧时间内出现的时长总和为所述当前驱动电流超过预设电流值的持续时间。
  3. 根据权利要求2所述的灰阶控制方法，其中，所述一帧时间包括多个子场，所述告警信号出现于相邻的多个所述子场内，及/或所述告警信号出现于不相邻的多个所述子场内。
  4. 根据权利要求3所述的灰阶控制方法，其中，多个所述子场的时长相等，及/或多个所述子场的时长不相等。
  5. 根据权利要求4所述的灰阶控制方法，其中，当多个所述子场的时长不相等时，所述确定所述告警信号在所述一帧时间内出现的时长总和为所述当前驱动电流超过预设电流值的持续时间的步骤，具体包括：
    确定在所述一帧时间内出现所述告警信号的子场为目标子场；
    根据预设公式以及所述目标子场的时长进行加权计算，以确定所述当前驱动电流超过预设电流值的持续时间。
  6. 根据权利要求1所述的灰阶控制方法，其中，所述根据所述持续时间将所述背光单元的灰阶值调整为目标灰阶值的步骤，具体包括：
    当所述持续时间超过预设时间时，获取灰阶值查找表，所述灰阶值查找表包括多个标定持续时间与多个灰阶值的映射信息；
    根据所述灰阶值查找表确定所述持续时间对应的灰阶值，作为目标灰阶值。
  7. 根据权利要求1所述的灰阶控制方法，其中，在所述根据所述持续时间将所述背光单元的灰阶值调整为目标灰阶值的步骤之后，还包括：
    根据所述目标灰阶值确定输出至所述背光单元的目标驱动电流。
  8. 根据权利要求7所述的灰阶控制方法，其中，在所述根据所述目标灰阶值确定输出至所述背光单元的目标驱动电流的步骤之后，还包括：
    输出重置信号；
    根据所述重置信号返回执行所述在一帧时间内，获取输出至所述背光单元中的当前驱动电流超过预设电流值的持续时间的步骤。
  9. 一种显示面板，其中，所述显示面板包括：
    背光单元；
    至少一个驱动电路，与所述背光单元电连接，用以驱动所述背光单元；
    灰阶输出模块，与所述驱动电路电连接，用以根据输出至所述背光单元的当前驱动电流超过预设电流值的持续时间，而确定向所述驱动电路提供驱动所述背光单元发光所需的目标灰阶值。
  10. 根据权利要求9所述的显示面板，其中，所述显示面板还包括检测单元，所述检测单元用以在所述当前驱动电流超过所述预设电流值时，向所述灰阶输出模块输出告警信号，而使所述灰阶输出模块确定所述告警信号在一帧时间内出现的时长总和为所述持续时间。
  11. 根据权利要求10所述的显示面板，其中，所述一帧时间包括多个子场，所述告警信号出现于相邻的多个所述子场内，及/或所述告警信号出现于不相邻的多个所述子场内。
  12. 根据权利要求11所述的显示面板，其中，多个所述子场的时长相等，及/或多个所述子场的时长不相等。
  13. 根据权利要求12所述的显示面板，其中，当多个所述子场的时长不相等时，所述检测单元用以确定在所述一帧时间内出现所述告警信号的子场为目标子场，并根据预设公式以及所述目标子场的时长进行加权计算，以确定所述当前驱动电流超过预设电流值的持续时间。
  14. 根据权利要求10所述的显示面板，其中，所述灰阶输出模块还用以在所述一帧时间结束后，输出重置信号至所述检测单元，而使所述检测单元停止输出所述告警信号。
  15. 根据权利要求10所述的显示面板，其中，于所述驱动电路上设置有检测电阻，所述检测单元电连接于所述检测电阻的两端，所述检测单元根据所述检测电阻的阻值以及所述检测电阻两端的电压确定所述当前驱动电流。
  16. 根据权利要求10所述的显示面板，其中，所述灰阶输出模块还包括供电单元，所述供电单元用以向所述检测单元供电。
  17. 一种移动终端，其中，所述移动终端包括显示面板，所述显示面板包括：
    背光单元；
    至少一个驱动电路，与所述背光单元电连接，用以驱动所述背光单元；
    灰阶输出模块，与所述驱动电路电连接，用以根据输出至所述背光单元的当前驱动电流超过预设电流值的持续时间，而确定向所述驱动电路提供驱动所述背光单元发光所需的目标灰阶值。
  18. 根据权利要求17所述的移动终端，其中，所述显示面板还包括检测单元，所述检测单元用以在所述当前驱动电流超过所述预设电流值时，向所述灰阶输出模块输出告警信号，而使所述灰阶输出模块确定所述告警信号在一帧时间内出现的时长总和为所述持续时间。
  19. 根据权利要求18所述的移动终端，其中，所述一帧时间包括多个子场，所述告警信号出现于相邻的多个所述子场内，及/或所述告警信号出现于不相邻的多个所述子场内。
  20. 根据权利要求19所述的移动终端，其中，多个所述子场的时长相等，及/或多个所述子场的时长不相等。
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