CN109686310B - Display device and driving method thereof - Google Patents
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- CN109686310B CN109686310B CN201910072266.XA CN201910072266A CN109686310B CN 109686310 B CN109686310 B CN 109686310B CN 201910072266 A CN201910072266 A CN 201910072266A CN 109686310 B CN109686310 B CN 109686310B
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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
Abstract
The embodiment of the invention provides a display device and a driving method thereof, relates to the technical field of display, can save the step of inputting signal parameters under the display state of an information screen in the prior art, and is favorable for saving Tact Time. A driving method of a display device, comprising: receiving a screen locking instruction; controlling the display device to be in a message screen display state according to the screen locking instruction, and calling a pre-stored signal parameter to control the brightness displayed by the message screen; the signal parameter is a parameter corresponding to a brightness node of a display picture of the display device, the picture displayed by the display device in an unlocked state has a plurality of brightness ranges, and the maximum brightness in each brightness range is a brightness node.
Description
Technical Field
The present invention relates to the field of display technologies, and in particular, to a display device and a driving method thereof.
Background
As the development speed of Organic Light-Emitting diodes (OLEDs) is faster and faster, the development of the functions thereof is more and more, and among them, the introduction of the function of information display (AOD) is of great significance.
In the related art, the display frame frequency for implementing the AOD function is usually 30Hz to reduce the power consumption of the AOD function, however, after the display frame frequency is adjusted to 30Hz, in order to avoid color coordinate shift and influence on the display effect, parameters for adjusting the brightness of the display device, such as a Gamma (Gamma) voltage, need to be input again to ensure the optical performance.
Disclosure of Invention
Embodiments of the present invention provide a display device and a driving method thereof, which can omit a step of inputting signal parameters in a state of a message screen display in the prior art, and is beneficial to saving Tact Time.
In order to achieve the above purpose, the embodiment of the invention adopts the following technical scheme:
in one aspect, a driving method of a display device is provided, including: receiving a screen locking instruction; controlling the display device to be in a message screen display state according to the screen locking instruction, and calling a pre-stored signal parameter to control the brightness displayed by the message screen; the signal parameter is a parameter corresponding to a brightness node of a display picture of the display device, the picture displayed by the display device in an unlocked state has a plurality of brightness ranges, and the maximum brightness in each brightness range is a brightness node.
Optionally, the signal parameters include gamma voltage and adjusting pulse width; the display device comprises a source electrode driving circuit and a plurality of data lines, wherein the output end of the source electrode driving circuit is electrically connected with the data lines; the driving method further includes: and sending the signal parameter to a source electrode driving circuit of the display device.
Optionally, the display device further includes a plurality of gate lines; controlling the turn-on time of each grid line in the display device to be
Wherein FR represents the display frame frequency of the display device in the display state of the information screen, and FR is less than 60 Hz; VBP + VFP + NL represents the number of such gate lines that are turned on in 1 second.
Optionally, controlling the RTN times of RCLK to be the turn-on time T of each gate line; where RCLK represents the time required for one clock cycle of the OSC crystal oscillator, and RTN is a value greater than 1.
Optionally, the display device further includes a plurality of data lines; and controlling the time for providing the data signals to the data lines when the display device is in the breath screen display state to be equal to the time for providing the data signals to the data lines when the display device is in the unlocking state.
Optionally, the display frame frequency of the display device in the breath screen display state is 30 Hz.
In another aspect, a display device is provided, which includes a receiving module and a processing module connected to the receiving module; the receiving module is used for receiving a screen locking instruction; the processing module is used for controlling the display device to be in a breath screen display state according to the screen locking instruction and calling the pre-stored signal parameters to control the brightness of the breath screen display; the signal parameter is a parameter corresponding to a brightness node of a display picture of the display device, the picture displayed by the display device in the unlocking state has a plurality of brightness ranges, and the maximum brightness in each brightness range is a brightness node.
Optionally, the processing module further comprises a source driving circuit and a plurality of data lines, wherein an output end of the source driving circuit is electrically connected with the data lines, and an input end of the source driving circuit is connected with the processing module; the signal parameters comprise gamma voltage and adjusting pulse width; the processing module is further used for sending the signal parameters to the source electrode driving circuit.
Optionally, the display device further comprises a control module and a plurality of grid lines, wherein the control module is connected with the grid lines; the control module is used for controlling the time for opening each grid line in the display device to be
Wherein FR represents the display frame frequency of the display device in the display state of the information screen, and FR is less than 60 Hz; VBP + VFP + NL represents the number of such gate lines that are turned on in 1 s.
Optionally, the control module is further configured to control an RTN time of the RCLK to be an on time T of each gate line; where RCLK represents the time required for one clock cycle of the OSC crystal oscillator, and RTN is a value greater than 1.
Optionally, the system further comprises a plurality of data lines; the control module is further configured to control a time when the display device is in a breath screen display state and provides the data signal to the data line, where the time is equal to a time when the display device is in an unlocked state and provides the data signal to the data line.
The embodiment of the invention provides a display device and a driving method thereof, wherein a brightness interval of a picture displayed by the display device in an unlocking state can be divided into a plurality of brightness ranges, wherein the maximum brightness in each brightness range is a brightness node; when the information screen is displayed, the parameter corresponding to one brightness node of the display picture in the unlocking state is directly called to adjust the brightness of the display picture in the information screen display state, so that the step of inputting signal parameters in the information screen display state to ensure the optical performance in the prior art can be omitted, and the Tact Time can be saved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic flowchart illustrating a driving method of a display device according to an embodiment of the present invention;
FIG. 2 is a signal parameter transmission diagram according to an embodiment of the present invention;
FIG. 3 is a timing diagram illustrating different display frame frequencies according to an embodiment of the present invention;
FIG. 4 is a diagram illustrating the relationship between modules in a display device according to an embodiment of the present invention;
fig. 5 is a diagram illustrating a relationship between modules in a display device according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
An embodiment of the present invention provides a driving method of a display device, as shown in fig. 1, which may be specifically implemented by the following steps:
and S11, receiving a screen locking instruction.
Here, the screen locking instruction may be transmitted by, for example, an external key of the display device; or, the screen locking instruction can also be sent by a touch key; alternatively, the screen locking command may be sent by the voice control structure. Of course, the screen locking command may also be sent by other structures on the display device, which is not limited in this embodiment of the present invention.
It should be noted that the display device may only include the display panel, or may be a display including the display panel, for example, the display device is an OLED display.
Illustratively, the display is a cell phone, camera, tablet computer, or the like.
Under the condition that the display device only comprises a display panel, the screen locking instruction can be sent by a touch key or a voice control structure; in the case that the display device is a display including a display panel, the screen locking command may be sent by an external key or a touch key or a voice control structure.
S12, controlling the display device to be in a screen locking display state according to the screen locking instruction, and calling the pre-stored signal parameters to control the brightness displayed by the screen locking instruction; the signal parameter is a parameter corresponding to a brightness node of a display picture of the display device, the picture displayed by the display device in the unlocking state has a plurality of brightness ranges, and the maximum brightness in each brightness range is a brightness node.
First, the division specification of the plurality of luminance ranges of the screen displayed in the unlocked state of the display device is not limited, and may be specifically determined according to the user's needs and actual settings. The plurality of luminance ranges may be equally or unequally divided into luminance sections of the display device in the unlocked state.
In an example, the brightness range of the display device in the unlocked state is 0 to 300nit (nit), and the brightness range can be divided into four brightness ranges, including 0 to 50nit, 50 to 150nit, 150 to 220nit, and 220 to 300 nit.
Or, the brightness interval of the display device in the unlocked state is 0-240 nit, which can be divided into six brightness ranges, including 0-40 nit, 40-80 nit, 80-120 nit, 120-160 nit, 160-200 nit, and 200-240 nit.
The boundary point luminance value between two adjacent luminance ranges may belong to at least one of the two luminance ranges.
Of course, three, five or more luminance ranges may also be included.
Secondly, regarding the brightness nodes, taking the brightness interval of the display device in the unlocked state as four brightness ranges, such as 0 to 50nit, 50 to 150nit, 150 to 220nit, 220 to 300nit, as an example, the brightness nodes are 50nit, 150nit, 220nit, 300 nit.
Thirdly, the picture displayed by the display device in the unlocked state has a plurality of brightness ranges, and further the brightness nodes of the picture displayed by the display device also include a plurality of brightness nodes, wherein a parameter corresponding to any one brightness node can be selected as the signal parameter and stored in advance.
Here, in order to save power consumption of the display device in the lock screen display state, it is considered that the screen display is performed such that a part or all of the display area of the screen is kept constantly bright in the lock screen display state of the display device, and a parameter corresponding to a luminance node having a low luminance value may be used as the signal parameter.
Fourthly, calling the pre-stored signal parameters to control the brightness displayed by the screen; the signal parameter is a parameter corresponding to a brightness node of a display frame of the display device. As the name implies, the signal parameter is related to the brightness of the display device, and the signal parameter is used to control the brightness of the display device.
And as long as the signal parameters for controlling the display screen of the display device are the same, the brightness of the screen displayed when the display device is in the unlocking state and the breath screen display state is also the same.
Fifth, in order to reduce power consumption of the display apparatus, a display frame frequency of the display apparatus in the breath screen display state is generally smaller than a display frame frequency of the display apparatus in the unlocked state.
Here, the manner of reducing the display frame frequency of the display device is not limited, and for example, the interval time between two adjacent frames of pictures may be increased, that is, the length of Blank (dead) region may be increased; alternatively, a plurality of clock cycles (RCLK) are employed when displaying one frame of picture.
Of course, other ways of reducing the display frame frequency of the display device may be utilized.
The embodiment of the invention provides a driving method of a display device, wherein a brightness interval of a picture displayed by the display device in an unlocked state can be divided into a plurality of brightness ranges, wherein the maximum brightness in each brightness range is a brightness node; when the screen is displayed, the parameter corresponding to one brightness node of the display picture in the unlocking state is directly called to adjust the brightness of the display picture in the screen display state, so that the step of inputting signal parameters in the screen display state to ensure the optical performance in the prior art can be omitted, and the beat Time (Tact Time) can be saved.
Specifically, in the embodiment of the present invention, the brightness of the display device in the breath screen display state is adjusted, and the specific experimental data is as shown in table 1:
TABLE 1
As can be seen from table 1, under the same gray scale, the brightness of the picture displayed by the display device in the unlocked state is substantially the same as the brightness of the picture displayed by the display device in the breath display state, and the color coordinates of the two are also substantially close to each other.
On the basis, in the experimental process, by using the scheme of the embodiment of the invention, the Tact Time of the production line can be reduced to about 20 seconds(s).
Optionally, referring to fig. 2, the signal parameters include a gamma voltage and a Pulse width Modulation (PWM for short); the display device comprises a source electrode driving circuit and a plurality of data lines, wherein the output end of the source electrode driving circuit is electrically connected with the data lines; the driving method further includes: and sending the signal parameter to a source electrode driving circuit of the display device.
Assuming that the gamma voltage value is 3V, PWM and the brightness of the picture displayed by the display device in the unlocked state is 60nit, the same gamma voltage value and the same PWM value are used as the signal parameters to be sent to the source driving circuit, and the source driving circuit sends the data signal to the data line for the display of the screen at the moment through the integration of the source driving circuit, and the brightness of the display device in the screen display state is 60nit at the moment.
In the case where the display device is an OLED display, the ground terminal voltage ELVSS and the operating voltage ELVDD are generally constant. That is, the ELVSS value in the display state of the display device on the information screen is equal to the ELVSS value in the unlocked state of the display device; the ELVDD value of the display device in the breath screen display state is equal to the ELVDD value of the display device in the unlocking state.
In the embodiment of the invention, the signal parameters for adjusting the brightness of the display picture of the display device in the information screen display state comprise the gamma voltage and the PWM value, and the gamma voltage and the PWM value are sent to the source electrode driving circuit, are integrated by the source electrode driving circuit into the data signal to be sent to the data line so as to control the brightness of the display picture.
Optionally, the display device further includes a plurality of gate lines; controlling the turn-on time of each grid line in the display device to be
Wherein, FR represents the display frame frequency of the display device in the display state of the information screen, and FR is less than 60 Hz; VBP + VFP + NL denotes the number of gate lines that are open in 1 second.
Wherein the content of the first and second substances,
which represents the time required to display one frame of picture in seconds, wherein,
nanoseconds (ns); in the process of opening a plurality of grid lines, the display device comprises an effective display line (NL), a display Back-segment free line (VBP), and a display Front-segment free line (VBP)Called VFP), which are added to represent the total number of lines for displaying a frame of picture; further, the time required to display a frame is divided by the total number of lines to display a frame, i.e.,
which indicates the time required to display each row, that is, T indicates the time required for each row of gate lines to turn on.
In the case where the normal display screen is not affected during the display on the screen, the display frame frequency of the display device in the screen display state is not limited, and for example, the display frame frequency of the display device in the screen display state is 25Hz, 30Hz, 40Hz, or the like.
Here, considering that the display frame frequency in the state where the display apparatus is in the breath screen display state is 30Hz, which is a display frame frequency in which the breath screen display state is mature, the display frame frequency in the state where the display apparatus is in the breath screen display state may be set to 30 Hz.
As shown in fig. 3, when the display frame frequency of the display device is 60Hz, the on time of each gate line is 5.2 microseconds (μ s); when the display frame frequency of the display device is 30Hz, the turn-on time of each grid line is 10.4 mus, that is, the turn-on time of one grid line when the display device is in the breath screen display state is twice the turn-on time of one grid line when the display device is in the unlock state.
According to the embodiment of the invention, the display frame frequency of the display device is adjusted by prolonging the opening time of each grid line; meanwhile, considering that the display frame frequency of the display device in the unlocked state is usually 60Hz or 120Hz, the display frame frequency of the display device in the breath screen display state can be less than 60Hz, so as to achieve the purpose of reducing the power consumption of the display device.
Further optionally, controlling the RTN times of RCLK to be the turn-on time T of each gate line; where RCLK represents the time required for one clock cycle of the OSC crystal oscillator, and RTN is a value greater than 1.
For example, as shown in FIG. 3, Add RTN represents: the on time of one gate line when the display frame frequency of the display device is 30Hz is increased by 5.2 mus compared with the on time of one gate line when the display frame frequency of the display device is 60 Hz.
Here, as shown in fig. 3, when the display frame frequency of the display device is 60Hz, the on time of each gate line is 5.2 μ s; when the display frame frequency of the display device is 30Hz, the on time of each gate line is 10.4 mus, i.e., the RTN value is 2.
Or, when the display frame frequency of the display device is 60Hz, the turn-on time of each grid line is 5.2 μ s; when the display frame frequency of the display device is 40Hz, the on time of each gate line is 7.8 μ s, i.e., the RTN value is 1.5.
In the embodiment of the present invention, compared to the prior art in which the time required for one clock cycle is RCLK, the embodiment of the present invention provides that the time required for one clock cycle is RTN times of RCLK.
Optionally, the display device further includes a plurality of data lines; and controlling the time for providing the data signals to the data lines when the display device is in the breath screen display state to be equal to the time for providing the data signals to the data lines when the display device is in the unlocking state.
For example, as shown in fig. 3, taking 2T1C pixel driving circuit as an example, when the display frame frequency of the display device is 30Hz, the time for each row of gate lines to be turned on is 5.2 μ s, the time for inputting the gate clock signal GCK to the gate of the switching transistor is 3.2 μ s, and further, the capacitor is charged in the state that the switching transistor is turned on, so that the data signal is input, and the time for charging the capacitor is also 3.2 μ s; when the display frame frequency of the display device is 60Hz, the time for turning on the gate line of each row is 10.4 μ s, the time for inputting the gate clock signal GC to the gate of the switching transistor is also 3.2 μ s, and further, the capacitor is charged in the on state of the switching transistor to input the data signal, and the time for charging the capacitor is also 3.2 μ s.
As shown in fig. 3, GCK is a gate clock signal input to the gate of the switching transistor corresponding to the first row of sub-pixels, GCB is a gate clock signal input to the gate of the switching transistor corresponding to the second row of sub-pixels, and the charging time of the sub-pixels in both rows in fig. 3 is 3.2 μ s.
Any row of sub-pixels can be a first row of sub-pixels, and a next row of sub-pixels of the first row of sub-pixels is a second row of sub-pixels. The sub-pixel of the 1 st row in the display panel is the sub-pixel of the next row of the last row of sub-pixels.
Thus, the on time of the switching transistor when the display frame frequency of the display device is 30Hz and the on time of the switching transistor when the display frame frequency of the display device is 60Hz are both 3.2 μ s, and the time for inputting the data signal to the data line when the display frame frequency of the display device is 30Hz and the time for inputting the data signal to the data line when the display frame frequency of the display device is 60Hz are both 3.2 μ s.
In addition, the time until the data signal is input to the data line when the display frame frequency of the display device is 30Hz is also the same as the time until the data signal is input to the data line when the display frame frequency of the display device is 60 Hz.
In the embodiment of the invention, the display frame frequency of the display device is changed, and meanwhile, the time for inputting the data signals to the data lines under different frequencies is ensured to be the same, so that the brightness of the display picture is ensured to be uniform.
An embodiment of the present invention further provides a display device, as shown in fig. 4, including a receiving module 11 and a processing module 12 connected to the receiving module 11; the receiving module 11 is used for receiving a screen locking instruction; the processing module 12 is configured to control the display device to be in a screen display state according to the screen locking instruction, and call a pre-stored signal parameter to control the brightness of the screen display; the signal parameter is a parameter corresponding to a brightness node of a display picture of the display device, the picture displayed by the display device in the unlocking state has a plurality of brightness ranges, and the maximum brightness in each brightness range is a brightness node.
First, the division specification of the plurality of luminance ranges of the screen displayed in the unlocked state of the display device is not limited, and may be specifically determined according to the user's needs and actual settings. The plurality of luminance ranges may be equally or unequally divided into luminance sections of the display device in the unlocked state.
In an example, the brightness range of the display device in the unlocked state is 0 to 300nit (nit), and the brightness range can be divided into four brightness ranges, including 0 to 50nit, 50 to 150nit, 150 to 220nit, and 220 to 300 nit.
Or, the brightness interval of the display device in the unlocked state is 0-240 nit, which can be divided into six brightness ranges, including 0-40 nit, 40-80 nit, 80-120 nit, 120-160 nit, 160-200 nit, and 200-240 nit.
The boundary point luminance value between two adjacent luminance ranges may belong to at least one of the two luminance ranges.
Of course, three, five or more luminance ranges may also be included.
Secondly, regarding the brightness nodes, taking the brightness interval of the display device in the unlocked state as four brightness ranges, such as 0 to 50nit, 50 to 150nit, 150 to 220nit, 220 to 300nit, as an example, the brightness nodes are 50nit, 150nit, 220nit, 300 nit.
Thirdly, the picture displayed by the display device in the unlocked state has a plurality of brightness ranges, and further the brightness nodes of the picture displayed by the display device also include a plurality of brightness nodes, wherein a parameter corresponding to any one brightness node can be selected as the signal parameter and stored in advance.
Here, in order to save power consumption of the display device in the lock screen display state, it is considered that the screen display is performed such that a part or all of the display area of the screen is kept constantly bright in the lock screen display state of the display device, and a parameter corresponding to a luminance node having a low luminance value may be used as the signal parameter.
Fourthly, calling the pre-stored signal parameters to control the brightness displayed by the screen; the signal parameter is a parameter corresponding to a brightness node of a display frame of the display device. As the name implies, the signal parameter is related to the brightness of the display device, and the signal parameter is used to control the brightness of the display device.
And as long as the signal parameters for controlling the display screen of the display device are the same, the brightness of the screen displayed when the display device is in the unlocking state and the breath screen display state is also the same.
Fifth, in order to reduce power consumption of the display apparatus, a display frame frequency of the display apparatus in the breath screen display state is generally smaller than a display frame frequency of the display apparatus in the unlocked state.
Here, the manner of reducing the display frame frequency of the display device is not limited, and for example, the interval time between two adjacent frames of pictures may be increased, that is, the length of a Blank region is increased; alternatively, a plurality of clock cycles are used when one frame of picture is displayed.
Of course, other ways of reducing the display frame frequency of the display device may be utilized.
Sixthly, the signal parameter is pre-stored in the display device, wherein the storage location of the signal parameter is not limited.
Illustratively, as shown in fig. 5, the display device further includes a storage module 13, and the signal parameter is stored in the storage module 13.
Seventh, the display device may include only the display panel, or may be a display including the display panel, for example, the display device is an OLED display.
Illustratively, the display is a cell phone, camera, tablet computer, or the like.
The embodiment of the invention provides a display device, wherein a brightness interval of a picture displayed by the display device in an unlocked state can be divided into a plurality of brightness ranges, wherein the maximum brightness in each brightness range is a brightness node; after the receiving module 11 of the display device receives the screen locking instruction, when the display is performed on the screen, the processing module 12 directly calls a parameter corresponding to a brightness node of the display picture in the unlocked state to adjust the brightness of the display picture in the screen display state.
Optionally, as shown in fig. 2, the display device further includes a source driving circuit and a plurality of data lines, an output end of the source driving circuit is electrically connected to the data lines, and an input end of the source driving circuit is connected to the processing module 12; the signal parameters comprise gamma voltage and PWM; the processing module 12 is further configured to send the signal parameter to the source driving circuit.
Assuming that the gamma voltage value is 3V, PWM and the brightness of the picture displayed by the display device in the unlocked state is 60nit, the same gamma voltage value and the same PWM value are used as the signal parameters to be sent to the source driving circuit, and the signal parameters are integrated by the source driving circuit to send the data signal to the data line for the display of the screen, and the brightness of the display device in the screen display state is 60nit at this time.
It should be noted that, in the case where the display device is an OLED display, ELVSS and ELVDD are generally constant values. Namely, the ELVSS value of the display device in the breath screen display state is equal to the ELVSS value of the display device in the unlocking state; the ELVDD value of the display device in the breath screen display state is equal to the ELVDD value of the display device in the unlocking state.
In the embodiment of the present invention, the signal parameters for adjusting the brightness of the display image of the display device in the display state of the information screen include a gamma voltage and a PWM value, and the processing module 12 sends the gamma voltage and the PWM value to the source driving circuit, and integrates the gamma voltage and the PWM value with a data signal through the source driving circuit to form a data signal, and sends the data signal to the data line, so as to control the brightness of the display image.
Optionally, the display device further includes a control module and a plurality of gate lines, and the control module is connected to the gate lines; a control module for controlling the turn-on time of each gate line in the display device
Wherein, FR represents the display frame frequency of the display device in the display state of the information screen, and FR is less than 60 Hz; VBP + VFP + NL represents the number of such gate lines that are turned on in 1 s.
Wherein the content of the first and second substances,
which represents the time required to display one frame of picture in seconds, wherein,
during the process of opening a plurality of grid lines, the effective display lines are includedThe display rear section spare line and the display front section spare line are added to represent the total line number of a frame of display frame; further, the time required to display a frame is divided by the total number of lines to display a frame, i.e.,
which indicates the time required to display each row, that is, T indicates the time required for each row of gate lines to turn on.
In the case where the normal display screen is not affected during the display on the screen, the display frame frequency of the display device in the screen display state is not limited, and for example, the display frame frequency of the display device in the screen display state is 25Hz, 30Hz, 40Hz, or the like.
Here, considering that the display frame frequency in the state where the display device is on the screen is 30Hz, the display frame frequency in the state where the display device is on the screen is more mature, it is preferable that the display frame frequency in the state where the display device is on the screen is 30 Hz.
As shown in fig. 3, when the display frame frequency of the display device is 60Hz, the on time of each gate line is 5.2 μ s; when the display frame frequency of the display device is 30Hz, the turn-on time of each grid line is 10.4 mus, that is, the turn-on time of one grid line when the display device is in the breath screen display state is twice the turn-on time of one grid line when the display device is in the unlock state.
According to the embodiment of the invention, the display frame frequency of the display device is adjusted by prolonging the opening time of each grid line; meanwhile, considering that the display frame frequency of the display device in the unlocked state is usually 60Hz or 120Hz, the display frame frequency of the display device in the breath screen display state can be less than 60Hz, so as to achieve the purpose of reducing the power consumption of the display device.
Further optionally, the control module is further configured to control the RTN times of the RCLK to be the turn-on time T of each gate line; where RCLK represents the time required for one clock cycle of the OSC crystal oscillator, and RTN is a value greater than 1.
For example, as shown in FIG. 3, Add RTN represents: when the display frame frequency of the display screen display device is 30Hz, the increasing time of the opening time of one grid line is 5.2 mus compared with the increasing time of the opening time of one grid line when the display frame frequency of the display screen display device is 60 Hz.
Here, as shown in fig. 3, when the display frame frequency of the display device is 60Hz, the on time of each gate line is 5.2 μ s; when the display frame frequency of the display device is 30Hz, the on time of each gate line is 10.4 mus, i.e., the RTN value is 2.
Or, when the display frame frequency of the display device is 60Hz, the turn-on time of each grid line is 5.2 μ s; when the display frame frequency of the display device is 40Hz, the on time of each gate line is 7.8 μ s, i.e., the RTN value is 1.5.
In the embodiment of the present invention, compared to the prior art in which the time required for one clock cycle is RCLK, the embodiment of the present invention provides that the time required for one clock cycle is RTN times of RCLK.
Optionally, the display device further includes a plurality of data lines; the control module is further configured to control a time when the display device is in a breath screen display state and provides the data signal to the data line, where the time is equal to a time when the display device is in an unlocked state and provides the data signal to the data line.
For example, as shown in fig. 3, in the case of the 2T1C pixel driving circuit, when the display frame frequency of the display device is 30Hz, the time for inputting the gate clock signal GCK to the gate of the switching transistor is 3.2 μ s; when the display frame frequency of the display device is 60Hz, the time for inputting the gate clock signal GC to the gate of the switching transistor is also 3.2 μ s. Thus, the on time of the switching transistor when the display frame frequency of the display device is 30Hz and the on time of the switching transistor when the display frame frequency of the display device is 60Hz are both 3.2 μ s, and the time for inputting the data signal to the data line when the display frame frequency of the display device is 30Hz and the time for inputting the data signal to the data line when the display frame frequency of the display device is 60Hz are both 3.2 μ s.
As shown in fig. 3, GCK is a gate clock signal input to the gate of the switching transistor corresponding to the first row of sub-pixels, GCB is a gate clock signal input to the gate of the switching transistor corresponding to the second row of sub-pixels, and the charging time of the sub-pixels in both rows in fig. 3 is 3.2 μ s.
Any row of sub-pixels can be a first row of sub-pixels, and a next row of sub-pixels of the first row of sub-pixels is a second row of sub-pixels. The sub-pixel of the 1 st row in the display panel is the sub-pixel of the next row of the last row of sub-pixels.
In addition, the time until the data signal is input to the data line when the display frame frequency of the display device is 30Hz is also the same as the time until the data signal is input to the data line when the display frame frequency of the display device is 60 Hz.
In the embodiment of the invention, the display frame frequency of the display device is changed, and meanwhile, the time for inputting the data signals to the data lines under different frequencies is ensured to be the same, so that the brightness of the display picture is ensured to be uniform.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (11)
1. A method of driving a display device, comprising:
receiving a screen locking instruction;
controlling the display device to be in a message screen display state according to the screen locking instruction, and calling a pre-stored signal parameter to control the brightness displayed by the message screen; the signal parameter is a parameter corresponding to a brightness node of a picture displayed by the display device, the picture displayed by the display device in an unlocked state has a plurality of brightness ranges, and the maximum brightness in each brightness range is a brightness node; wherein the content of the first and second substances,
the signal parameters include gamma voltage and adjustment pulse width.
2. The method for driving a display device according to claim 1, wherein the display device comprises a source driver circuit and a plurality of data lines, and an output terminal of the source driver circuit is electrically connected to the data lines;
the driving method further includes: and sending the signal parameter to a source electrode driving circuit of the display device.
3. The method for driving a display device according to claim 1, wherein the display device further comprises a plurality of gate lines;
controlling the turn-on time of each grid line in the display device to be
Wherein FR represents the display frame frequency of the display device in the display state of the information screen, and FR is less than 60 Hz; VBP + VFP + NL represents the number of such gate lines that are turned on in 1 second.
4. The method of claim 3, wherein RTN of RCLK is controlled to be equal to the turn-on time T of each gate line;
where RCLK represents the time required for one clock cycle of the OSC crystal oscillator, and RTN is a value greater than 1.
5. The method for driving a display device according to claim 3 or 4, wherein the display device further comprises a plurality of data lines;
and controlling the time for providing the data signals to the data lines when the display device is in the breath screen display state to be equal to the time for providing the data signals to the data lines when the display device is in the unlocking state.
6. The method for driving a display device according to claim 3 or 4, wherein a display frame frequency of the display device in a breath screen display state is 30 Hz.
7. The display device is characterized by comprising a receiving module and a processing module connected with the receiving module;
the receiving module is used for receiving a screen locking instruction;
the processing module is used for controlling the display device to be in a breath screen display state according to the screen locking instruction and calling the pre-stored signal parameters to control the brightness of the breath screen display; the signal parameter is a parameter corresponding to a brightness node of a display picture of the display device, the picture displayed by the display device in an unlocked state has a plurality of brightness ranges, and the maximum brightness in each brightness range is a brightness node; wherein the content of the first and second substances,
the signal parameters include gamma voltage and adjustment pulse width.
8. The display device according to claim 7, further comprising a source driver circuit and a plurality of data lines, wherein an output terminal of the source driver circuit is electrically connected to the data lines, and an input terminal of the source driver circuit is connected to the processing module;
the processing module is further used for sending the signal parameters to the source electrode driving circuit.
9. The display device according to claim 7, further comprising a control module and a plurality of gate lines, the control module being connected to the gate lines;
the control module is used for controlling the time for opening each grid line in the display device to be
Wherein FR represents the display frame frequency of the display device in the display state of the information screen, and FR is less than 60 Hz; VBP + VFP + NL represents the number of such gate lines that are turned on in 1 s.
10. The display device according to claim 9, wherein the control module is further configured to control RTN of RCLK to be equal to the turn-on time T of each gate line;
where RCLK represents the time required for one clock cycle of the OSC crystal oscillator, and RTN is a value greater than 1.
11. The display device according to claim 9 or 10, further comprising a plurality of data lines;
the control module is further configured to control a time when the display device is in a breath screen display state and provides the data signal to the data line, where the time is equal to a time when the display device is in an unlocked state and provides the data signal to the data line.
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| KR102573689B1 (en) * | 2016-09-29 | 2023-09-04 | 엘지디스플레이 주식회사 | Display device, always-on-display control method and mobile terminal using the same |
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| CN107484231A (en) * | 2017-07-28 | 2017-12-15 | 广东欧珀移动通信有限公司 | Screen parameter method of adjustment, device, terminal and computer-readable recording medium |
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