CN116597796A - Driving method and driving circuit of display panel and display device - Google Patents
Driving method and driving circuit of display panel and display device Download PDFInfo
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- CN116597796A CN116597796A CN202310880908.5A CN202310880908A CN116597796A CN 116597796 A CN116597796 A CN 116597796A CN 202310880908 A CN202310880908 A CN 202310880908A CN 116597796 A CN116597796 A CN 116597796A
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- 238000000034 method Methods 0.000 title claims abstract description 48
- 239000003990 capacitor Substances 0.000 claims abstract description 144
- 239000004973 liquid crystal related substance Substances 0.000 claims abstract description 122
- 239000010409 thin film Substances 0.000 claims description 86
- 238000004590 computer program Methods 0.000 claims description 10
- 230000007306 turnover Effects 0.000 claims description 7
- 238000010586 diagram Methods 0.000 description 14
- 238000004891 communication Methods 0.000 description 7
- 239000000758 substrate Substances 0.000 description 7
- 230000008569 process Effects 0.000 description 6
- 239000003086 colorant Substances 0.000 description 3
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000006870 function Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 239000002096 quantum dot Substances 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 241001270131 Agaricus moelleri Species 0.000 description 1
- 206010047571 Visual impairment Diseases 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- 230000011664 signaling Effects 0.000 description 1
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Classifications
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
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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
- G09G3/2003—Display of colours
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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
- G09G2300/00—Aspects of the constitution of display devices
- G09G2300/08—Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
- G09G2300/0809—Several active elements per pixel in active matrix panels
- G09G2300/0842—Several active elements per pixel in active matrix panels forming a memory circuit, e.g. a dynamic memory with one capacitor
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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
- G09G2310/00—Command of the display device
- G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
- G09G2310/0235—Field-sequential colour display
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- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
Abstract
The application belongs to the technical field of display, and provides a driving method, a driving circuit and display equipment of a display panel, wherein the display panel comprises a plurality of pixel units, the pixel units comprise storage capacitors and liquid crystal capacitors, the time required by the display panel to display each frame of image comprises a plurality of sub-field sequences, the sub-field sequences comprise a data writing period and a backlight light emitting period in sequence, and the driving method comprises the following steps: determining first display data required by the sub-field sequence i and second display data required by the sub-field sequence i+1; writing first display data into the liquid crystal capacitor in a data writing period of the sub-field sequence i; temporarily storing the second display data to the storage capacitor in the backlight light-emitting period of the sub-field sequence i, and providing backlight for the display panel; in the data writing period of the subfield sequence i+1, the second display data in the storage capacitor is written into the liquid crystal capacitor, so that the time required by the pixel driving data writing stage is saved, and the display brightness of the display panel is improved.
Description
Technical Field
The present application relates to the field of display technologies, and in particular, to a driving method and driving circuit for a display panel, and a display device.
Background
The color field sequential display is a display mode for realizing color display by the display device, and the principle of the color field sequential display is as follows: dividing a frame of image frame to be displayed into a plurality of monochromatic color component images according to colors, dividing the display time of the frame into a plurality of sub-field sequences corresponding to the color component images one by one, displaying the color component images in the corresponding sub-field sequences, rapidly switching the plurality of color component images in the display time of the frame, and realizing the superposition of colors in time by utilizing the human eye persistence effect, thereby realizing color display.
Writing pixel driving data corresponding to the color component diagram into the liquid crystal display panel in the subfield sequence, and driving and moving liquid crystal in the liquid crystal display panel to a position corresponding to the color component diagram after the writing of the pixel driving data is completed; and then controlling the backlight module to start the backlight with the color corresponding to the sub-field sequence so as to realize the display of the color component diagram in the corresponding field sequence.
However, the writing process of the pixel driving data may result in a shorter time for turning on the backlight of the display panel, which may affect the overall display brightness and color gamut.
Disclosure of Invention
In view of the above, embodiments of the present application provide a driving method, a driving circuit and a display device for a display panel, so as to solve the technical problem that in the field sequential display process, the display brightness and the color gamut of the display panel are affected as the backlight of the display panel is turned on for a short time, resulting in poor user experience.
To solve the above-mentioned technical problem, in a first aspect, the present application provides a driving method of a display panel, the display panel including a plurality of pixel units, the pixel units including a storage capacitor and a liquid crystal capacitor, the display panel displaying a time required for each frame of image including a plurality of sub-field sequences sequentially including a data writing period and a backlight emission period, the method comprising:
determining first display data required by a sub-field sequence i and second display data required by a sub-field sequence i+1, wherein i is a positive integer;
writing the first display data into the liquid crystal capacitor in the data writing period of the subfield sequence i so as to enable the pixel electrode of the pixel unit of the display panel to keep the gray scale voltage corresponding to the first display data;
temporarily storing the second display data to the storage capacitor in the backlight light-emitting period of the subfield sequence i, and providing backlight for the display panel;
and writing second display data in the storage capacitor into the liquid crystal capacitor in the data writing period of the subfield sequence i+1 so as to enable the pixel electrode of the pixel unit to keep the gray scale voltage corresponding to the second display data.
In one example of the first aspect, the method further comprises: and erasing the first display data in the liquid crystal capacitor in the data writing period of the subfield sequence i+1.
In one example of the first aspect, the method further comprises:
erasing display data required by the sub-field sequence i-1 in the liquid crystal capacitor in the data writing period of the sub-field sequence i;
the writing the first display data into the liquid crystal capacitor in the data writing period of the subfield order i to enable the pixel electrode of the pixel unit of the display panel to maintain the gray scale voltage corresponding to the first display data includes:
and writing the first display data in the storage capacitor into the liquid crystal capacitor in the data writing period of the subfield sequence i so as to enable the pixel electrode of the pixel unit of the display panel to keep the gray scale voltage corresponding to the first display data.
In one example of the first aspect, the sub-field sequence further includes a liquid crystal inversion period, wherein the liquid crystal inversion period is located between the data writing period and the backlight emission period;
the writing the first display data into the liquid crystal capacitor in the data writing period of the subfield order i to enable the pixel electrode of the pixel unit of the display panel to maintain the gray scale voltage corresponding to the first display data includes:
writing the first display data into the liquid crystal capacitor in the data writing period of the subfield sequence i;
driving the liquid crystal capacitor to turn over corresponding liquid crystal molecules in a liquid crystal turning-over period of the subfield sequence i so as to enable pixel electrodes of pixel units of the display panel to keep gray scale voltages corresponding to the first display data;
the writing the second display data in the storage capacitor into the liquid crystal capacitor in the data writing period of the subfield sequence i+1 so that the pixel electrode of the pixel unit maintains the gray scale voltage corresponding to the second display data, including:
writing the second display data into the liquid crystal capacitor in a data writing period of the subfield sequence i+1;
and driving the liquid crystal capacitor to turn over corresponding liquid crystal molecules in the liquid crystal turning-over period of the subfield sequence i+1 so as to enable the pixel electrode of the pixel unit of the display panel to keep the gray scale voltage corresponding to the second display data.
In one example of the first aspect, each pixel unit corresponds to a first thin film transistor and a second thin film transistor, respectively, wherein the first thin film transistor is connected to the storage capacitor, and the second thin film transistor is connected to the liquid crystal capacitor;
the temporarily storing the second display data in the storage capacitor in the backlight light emitting period of the subfield order i, and providing backlight for the display panel, including:
in the backlight light-emitting period of the subfield sequence i, temporarily storing the second display data to the storage capacitor by turning on the first thin film transistor, and providing backlight for the display panel;
the writing the second display data in the storage capacitor into the liquid crystal capacitor in the data writing period of the subfield sequence i+1 so that the pixel electrode of the pixel unit maintains the gray scale voltage corresponding to the second display data, including:
and in the data writing period of the subfield sequence i+1, writing the second display data to the liquid crystal capacitor by starting the second thin film transistor so as to enable the pixel electrode of the pixel unit to keep the gray scale voltage corresponding to the second display data.
In one example of the first aspect, the pixel unit further corresponds to a third thin film transistor;
the erasing the first display data in the liquid crystal capacitor in the data writing period of the subfield order i+1 includes:
and in the data writing period of the subfield sequence i+1, erasing the first display data in the liquid crystal capacitor by turning on a third thin film transistor.
The application has the beneficial effects that: the pixel driving data writing stage of the next sub-field sequence is overlapped with the light emitting stage of the last sub-field sequence, so that the time required by the pixel driving data writing stage is greatly saved, the duty ratio of backlight light emission is improved, and the display brightness of the display panel is improved.
In a second aspect, the present application also provides a driving circuit of a display panel, the driving circuit comprising:
a storage capacitor;
a liquid crystal capacitor;
the control end of the first thin film transistor is used for being connected with a grid scanning signal, the input end of the first thin film transistor is connected with a source signal, and the output end of the first thin film transistor is connected with the storage capacitor;
the controlled end of the second thin film transistor is used for accessing a data writing signal, the input end of the second thin film transistor is connected with the storage capacitor, and the output end of the second thin film transistor is connected with the liquid crystal capacitor;
wherein, the controller corresponding to the display panel is used for
In the backlight light emitting period of the sub-field sequence i-1, a grid scanning signal is sent to the controlled end of the first thin film transistor, so that the first thin film transistor receives a source signal to determine first display data required by the sub-field sequence i, and the first display data is temporarily stored in the storage capacitor;
in the data writing period of the subfield sequence i, a data writing signal is sent to the controlled end of the second thin film transistor so as to write first display data in the storage capacitor into the liquid crystal capacitor, and the pixel electrode of the pixel unit of the display panel keeps the gray scale voltage corresponding to the first display data;
in the backlight light emitting period of the sub-field sequence i, a grid scanning signal is sent to the controlled end of the first thin film transistor, so that the first thin film transistor receives a source signal to determine second display data required by the sub-field sequence i+1, and the second display data is temporarily stored in the storage capacitor;
in the data writing period of the subfield sequence i+1, a data writing signal is sent to the controlled end of the second thin film transistor so as to write second display data in the storage capacitor into the liquid crystal capacitor; and sending a data erasing signal to the third thin film transistor so as to erase the first display data in the liquid crystal capacitor, so that the pixel electrode of the pixel unit of the display panel maintains the gray scale voltage corresponding to the second display data.
In one example of the second aspect, the driving circuit further includes:
the controlled end of the third thin film transistor is used for being connected with a data erasing signal, the input end of the third thin film transistor is connected with the liquid crystal capacitor, and the output end of the third thin film transistor is connected with the common electrode;
wherein, the controller that display panel corresponds is still used for:
transmitting a data erasing signal to the third thin film transistor in the data writing period of the sub-field sequence i so as to erase the display data required by the sub-field sequence i-1 in the liquid crystal capacitor;
and in the data writing period of the subfield sequence, sending a data erasing signal to the third thin film transistor so as to erase the first display data in the liquid crystal capacitor.
A third aspect of an embodiment of the present application provides a display device comprising a display panel, a memory, a controller and a computer program stored in the memory and executable on the controller, the controller implementing the steps of the driving method as claimed in any one of the preceding claims when the computer program is executed.
In the driving method of the display panel according to the first aspect of the embodiment of the present application, it is to be understood that the beneficial effects of the second aspect and the third aspect can be seen from the related description in the first aspect, and are not repeated herein.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments or the description of the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a display device according to a first embodiment of the present application;
FIG. 2 is a color field sequential display timing diagram of a conventional display panel;
fig. 3 is a flowchart illustrating a driving method of a display panel according to a second embodiment of the application;
FIG. 4 is a timing chart of color field sequential display of a display panel according to an embodiment of the present application;
FIG. 5 is a schematic circuit diagram of a pixel unit according to an embodiment of the present application;
fig. 6 is a circuit operation timing diagram corresponding to the display device in operation according to the embodiment of the present application.
Reference numerals:
01-display panel, 02-memory, 03-controller, 04-communication interface;
the relevant reference numerals in the circuit diagram of fig. 5 illustrate:
t1-first thin film transistor, T2-second thin film transistor, T3-third thin film transistor, cst-storage capacitor, clc-liquid crystal capacitor, data-Data signal, gate-Gate scan signal, data-Data signal, reset-Data erase signal, share-Data write signal, common electrode of Acom-array substrate, common electrode of CFcom-CF substrate.
Detailed Description
In the following description, for purposes of explanation and not limitation, specific details are set forth such as the particular system architecture, techniques, etc., in order to provide a thorough understanding of the embodiments of the present application. It will be apparent, however, to one skilled in the art that the present application may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present application with unnecessary detail.
It should also be understood that the term "and/or" as used in the present specification and the appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes such combinations.
Furthermore, the terms "first," "second," "third," and the like in the description of the present specification and in the appended claims, are used for distinguishing between descriptions and not necessarily for indicating or implying a relative importance.
Reference in the specification to "one embodiment" or "some embodiments" or the like means that a particular feature, structure, or characteristic described in connection with the embodiment is included in one or more embodiments of the application. Thus, appearances of the phrases "in one embodiment," "in some embodiments," "in other embodiments," and the like in the specification are not necessarily all referring to the same embodiment, but mean "one or more but not all embodiments" unless expressly specified otherwise. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless expressly specified otherwise.
Example 1
An embodiment of the present application provides a display device, and fig. 1 shows a schematic structural diagram of a display device 100 of this embodiment, where the display device includes a display panel 01, a memory 02, a controller 03, and a computer program stored in the memory 02 and capable of running on the controller 03, where the controller may be a DIC (digital in-line ceramic package, driver circuit integrated chip) or a TCON (timing controller ). The driving method of the display device may be performed by a controller of the display device when running a corresponding computer program.
Specifically, the memory 02 and the controller 03 may be connected by a bus or a signal line. The display panel 01 may be connected to the communication interface 04 through a bus, a signal line, or a circuit board.
The communication interface 04 may be used to connect an I/O (Input/Output) related display panel 01 to the controller 03 and the memory 02. In some embodiments, the controller 03, the memory 02 and the communication interface 04 are integrated on the same chip or circuit board; in some other embodiments, either or both of the controller 03 and the memory 02 and the communication interface 04 may be implemented on a separate chip or circuit board, which is not limited in this embodiment.
The display device may be a thin film transistor liquid crystal display (Thin Film Transistor Liquid Crystal Display, TFT-LCD), liquid crystal display (Liquid Crystal Display, LCD), organic laser display (Organic Electroluminesence Display, OLED), quantum dot light emitting diode (Quantum Dot Light Emitting Diodes, QLED) display.
In applications, display devices typically include high definition multimedia interfaces (High Definition Multimedia Interface, HDMI), substrates, motherboards, timing control boards, source drivers, gate drivers, backlight components, and the like. The substrate includes a power management integrated circuit (power management integrated circuit, pmic) for providing an operating voltage for a main board, a timing control board, a data driving board, a scan driving board, etc., and for generating a common voltage. The motherboard comprises a Transition-minimized differential signaling (TMDS) receiver, an analog-to-digital converter, a clock generator, a master control chip (Scaler IC), a microcontroller circuit, an embedded display interface and the like. The microcontroller circuit typically includes a backlight control chip, a display data memory, and the like. The timing control board includes timing controller (TCON, timing Controller), data clock recovery (Clock and Data Recovery, CDR) circuits, and the like. The Source Driver includes a data driving unit, which may be a Source Driver Chip (Source Driver IC) or a thin Film Source Driver Chip (S-COF) for emitting Source signals. The Gate Driver includes a Gate driving unit, which may be a Gate driving Chip (Gate Driver IC) or a thin Film Gate driving Chip (G-COF) for emitting a Gate scan signal.
The backlight source assembly comprises a backlight module, and the backlight module can provide backlight corresponding to the sub-field sequence for the liquid crystal display panel.
It is understood that the manner in which the liquid crystal display device implements color display is classified into a color filtering method and a color field sequential display method. In a liquid crystal display device using a color filtering method, each pixel unit of a display panel is divided into three sub-pixel units, and color filters of corresponding colors are provided for each sub-pixel unit, and light emitted from a backlight source is transmitted to red, green and blue color filters through liquid crystals, thereby forming a color image. In a liquid crystal display device using a color field sequential display method, RGB light sources are arranged in each pixel unit instead of decomposing the pixel unit into three RGB sub-pixel units. And the red, green and blue primary lights emitted by the RGB light source are sequentially emitted through the liquid crystal in a time-sharing mode, and the liquid crystal molecules corresponding to the pixel units are correspondingly controlled to deflect a preset angle in a time-sharing mode, and the gray scales of the corresponding R, G and B primary lights are corresponding, so that the afterimage effect is used for displaying the color image.
In this embodiment, the display panel is driven by a color field sequential display method.
Because the conventional color field sequence display method writes pixel driving data corresponding to the color component diagram into the liquid crystal display panel in the sub-field sequence, after the pixel driving data writing is completed, the liquid crystal in the liquid crystal display panel is driven and moves to the position corresponding to the color component diagram; and then controlling the backlight module to start the backlight with the color corresponding to the sub-field sequence so as to realize the display of the color component diagram in the corresponding field sequence. However, the writing process of the pixel driving data may result in a shorter time for turning on the backlight, which may affect the overall display brightness and color gamut.
Fig. 2 is a timing chart of color field sequential display of a conventional display panel, and as shown in fig. 2, a frame of color display is divided into three sub-field sequences of RGB, and a completed frame of color display is formed by overlapping the three sub-field sequences. Each frame of the sub-field sequence can be divided into three phases: writing data, turning over liquid crystal, and emitting light by backlight; with the current higher and higher requirements of people on display resolution, the data writing amount will become larger and longer, so that the time of writing data becomes longer and longer, which compresses the time of backlight light emission, and the actual duty ratio of display light emission becomes smaller, thereby influencing the realization of high brightness and high color gamut of the display.
The display device of the embodiment can overlap the pixel driving data writing stage of the next subfield sequence and the light emitting stage of the previous subfield sequence, so that the defect of the conventional color field sequence display of fig. 2 can be overcome, the time required by the pixel driving data writing stage is greatly saved, the duty ratio of backlight light emission is improved, and the display brightness of the display panel is improved.
Example two
As shown in fig. 3, the driving method of the display panel provided in the second embodiment of the present application is applied to the display device, where the display panel includes a plurality of pixel units, the pixel units include a storage capacitor and a liquid crystal capacitor, and the time required for displaying each frame of image of the display panel includes a plurality of sub-field sequences, and the sub-field sequences sequentially include a data writing period, a liquid crystal inversion period, and a backlight light emission period;
accordingly, the driving method of the present embodiment includes the following steps S10 to S40:
step S10, determining first display data required by the sub-field sequence i and second display data required by the sub-field sequence i+1, wherein i is a positive integer.
The driving method of the display panel of the present embodiment is performed by a controller of the display device, and the timing controller TCON is taken as an example of the controller of the display device. In this embodiment, one pixel unit corresponds to three sub-field sequences.
In this embodiment, the time required for the display panel to display each frame of image may include at least two sub-field sequences, i.e., sub-field sequence i and sub-field sequence i+1;
for example, when a gate signal is scanned to a thin film transistor in a pixel unit of a display panel during displaying a frame of a picture, a source driver supplies display data (i.e., pixel driving data) to the thin film transistor in the pixel unit, and in a subfield sequence i of the frame of the picture, the pixel driving data required by each pixel unit is called first display data; in the sub-field sequence i+1 of the frame, the pixel driving data required for each pixel unit is referred to as second display data.
Step S20, writing the first display data into the liquid crystal capacitor in the data writing period of the subfield sequence i so as to enable the pixel electrode of the pixel unit of the display panel to keep the gray scale voltage corresponding to the first display data;
in a specific application, as shown in fig. 4, the time required for the display panel to display each frame of image may include a sub-field order R (corresponding to sub-field order i), a sub-field order G (corresponding to sub-field order i+1), and a sub-field order B (corresponding to sub-field order i+2) in order;
in the data writing period of the subfield sequence i, pixel driving data in a liquid crystal capacitor needs to be erased, and the first display data (R pixel driving data) is written into the liquid crystal capacitor; for example: erasing display data required by the sub-field sequence i-1 in the liquid crystal capacitor in the data writing period of the sub-field sequence i; and writing the first display data in the storage capacitor into the liquid crystal capacitor in the data writing period of the subfield sequence i.
And driving the liquid crystal capacitor to turn over corresponding liquid crystal molecules in the liquid crystal turning-over period of the subfield sequence i, so that the pixel electrode of the pixel unit of the display panel keeps the gray scale voltage corresponding to the R pixel driving data.
Step S30, temporarily storing the second display data to the storage capacitor in the backlight light emitting period of the sub-field sequence i, and providing backlight for the display panel;
it can be understood that the second display data required by the next subfield sequence G is temporarily stored in the storage capacitor in the backlight emission period of the subfield sequence R, so that the pixel driving data writing stage of the next subfield sequence overlaps with the emission stage of the previous subfield sequence.
Step S40, in the data writing period of the subfield sequence i+1, writing the second display data in the storage capacitor into the liquid crystal capacitor, so that the pixel electrode of the pixel unit maintains the gray scale voltage corresponding to the second display data.
In a specific implementation, during the data writing period of the subfield sequence i+1, the first display data in the liquid crystal capacitor is erased.
It can be understood that the data writing period of the sub-field sequence G may entirely erase the R pixel driving data in the liquid crystal capacitor, write the G pixel driving data (second display data) temporarily stored in the storage capacitor into the liquid crystal capacitor, and drive the liquid crystal capacitor to turn over the corresponding liquid crystal molecules in the liquid crystal turning period of the sub-field sequence G, so that the pixel electrode of the pixel unit of the display panel maintains the gray scale voltage corresponding to the G pixel driving data.
The pixel driving data required by the next sub-field sequence B is temporarily stored in a storage capacitor, and backlight is provided for the display panel; the pixel driving data writing stage of the next sub-field sequence is still overlapped with the light emitting stage of the previous sub-field sequence;
further, the data writing period of the sub-field sequence B is to entirely erase the G pixel driving data in the liquid crystal capacitor, write the B pixel driving data (third display data) temporarily stored in the storage capacitor into the liquid crystal capacitor, and drive the liquid crystal capacitor to turn over corresponding to the liquid crystal molecules in the liquid crystal turning period of the sub-field sequence B, so that the pixel electrode of the pixel unit of the display panel maintains the gray scale voltage corresponding to the B pixel driving data, and the display panel can display a frame of RGB color picture, thereby saving the time required by the pixel driving data writing period, and further improving the duty ratio of backlight light emission, and further improving the display brightness of the display panel.
Example III
An embodiment of the present application provides a driving circuit of a display panel, as shown in fig. 5, the driving circuit includes:
a storage capacitor Cst;
a liquid crystal capacitor Clc;
the control end of the first thin film transistor is used for being connected with a Gate scanning signal Gate, the input end of the first thin film transistor is connected with a source signal Data, and the output end of the first thin film transistor is connected with the storage capacitor Cst;
the controlled end of the second thin film transistor T2 is used for accessing a data writing signal Share, the input end of the second thin film transistor is connected with the storage capacitor Cst, the output end of the second thin film transistor is connected with the liquid crystal capacitor Clc, and the liquid crystal capacitor Clc is connected with the common electrode CFcom of the CF substrate of the display panel;
a third thin film transistor T3, a controlled end of which is used for accessing a data erasing signal Reset, an input end of which is connected with the liquid crystal capacitor Clc, and an output end of which is connected with a common electrode, specifically, an output end of which is connected with a common electrode Acom of the array substrate of the display panel;
wherein, the controller that display panel corresponds is used for:
in the backlight light emitting period of the sub-field sequence i-1, a Gate scanning signal Gate is sent to a controlled end of the first thin film transistor, so that the first thin film transistor receives a source signal Data to determine first display Data required by the sub-field sequence i, and the first display Data is temporarily stored in the storage capacitor;
in the data writing period of the subfield sequence i, a data writing signal Share is sent to the controlled end of the second thin film transistor so as to write the first display data in the storage capacitor into the liquid crystal capacitor; transmitting a data erasing signal Reset to the third thin film transistor T3 to erase the display data required by the subfield sequence i-1 in the liquid crystal capacitor, so that the pixel electrode of the pixel unit of the display panel maintains the gray scale voltage corresponding to the first display data;
in the backlight light emitting period of the sub-field sequence i, a Gate scanning signal Gate is sent to a controlled end of the first thin film transistor, so that the first thin film transistor receives a source signal Data to determine second display Data required by the sub-field sequence i+1, and the second display Data is temporarily stored in the storage capacitor;
in the data writing period of the subfield sequence i+1, a data writing signal Share is sent to the controlled end of the second thin film transistor so as to write the second display data in the storage capacitor into the liquid crystal capacitor; and sending a data erasing signal Reset to the third thin film transistor T3 to erase the first display data in the liquid crystal capacitor, so that the pixel electrode of the pixel unit of the display panel maintains the gray scale voltage corresponding to the second display data.
In an embodiment, as shown in fig. 5, fig. 5 is a schematic circuit design diagram of a pixel unit according to an embodiment of the present application, each pixel unit may be sequentially connected to a first thin film transistor T1, a second thin film transistor T2 and a third thin film transistor T3, where the first thin film transistor is connected to a storage capacitor, and the second thin film transistor is connected to a liquid crystal capacitor, so that the pixel unit is divided into a data temporary storage unit, a data writing unit and a data erasing unit.
For the data temporary storage unit, the scheme of temporarily storing the second display data to the storage capacitor and providing backlight for the display panel in the backlight light emitting period of the subfield sequence i corresponding to the step S30 specifically includes:
in the backlight light-emitting period of the subfield sequence i, temporarily storing the second display data to the storage capacitor by turning on the first thin film transistor, and providing backlight for the display panel;
for the data writing unit, in the data writing period of the subfield sequence i+1 corresponding to the step S40, the scheme for writing the second display data in the storage capacitor into the liquid crystal capacitor so as to enable the pixel electrode of the pixel unit to maintain the gray scale voltage corresponding to the second display data specifically includes:
and in the data writing period of the subfield sequence i+1, writing the second display data to the liquid crystal capacitor by starting the second thin film transistor so as to enable the pixel electrode of the pixel unit to keep the gray scale voltage corresponding to the second display data.
The scheme for erasing the first display data in the liquid crystal capacitor in the data writing period of the subfield sequence i+1 corresponding to the data erasing unit specifically includes:
and in the data writing period of the subfield sequence i+1, erasing the first display data in the liquid crystal capacitor by turning on a third thin film transistor.
Specifically, as shown in fig. 5, T1, T2, and T3 are arranged in order from left to right, the data temporary storage unit is composed of T1 and Cst (storage capacitor), the data writing unit is composed of T2 and Clc (liquid crystal capacitor), and the data erasing unit is composed of T3.
Fig. 6 is a circuit operation timing diagram corresponding to the operation of the display device, and fig. 6 is illustrated by taking the subfield sequence G in fig. 4 as an example.
As shown in fig. 6, it can be seen that the embodiment of the present application overlaps the data writing phase of the next subfield sequence and the light emitting phase of the previous subfield sequence, so as to greatly save the time of the data writing phase, greatly improve the duty ratio of backlight light emission, and further improve the brightness.
Specifically, the circuit work is sequentially divided into a data temporary storage stage, a data erasing stage and a data writing stage according to the time sequence:
in the Data temporary storage stage, at this time, the Gate scanning signal is at a high level, the first thin film transistor T1 is turned on, the Data signal is written into the storage capacitor Cst corresponding to the G pixel driving Data, this step is completed row by row until all rows of Data are temporarily stored in Cst, at this time, the Data in Clc is still the pixel driving Data of the last subfield order R, the backlight is still bright R pixels, and the temporary storage of the G pixel driving Data in the continuous light emission of R pixels is realized.
In the data erasing stage, at this time, the reset data erasing signal is at a high level, the second thin film transistor T2 is turned on, and the data corresponding to the common electrode Acom of the array substrate is written into the storage capacitor Clc, so as to realize the data reset of B in the storage capacitor Clc. At this time, the backlight module is in a turned-off state, and the data erasing signal reset of the whole panel is started together, not row by row, so that the time required for this stage is very short.
In the data writing stage, the Share data writing signal is at high level, the T2 is turned on, the data stored in the A point in Cst is shared with the data stored in the B point in Clc, so as to reach the pixel voltage of one target.
In application, each module in the driving device of the display panel can be a software program unit, or can be realized by different logic circuits integrated in the driving circuit integrated chip or independent physical components connected with the controller.
It should be noted that, because the content of information interaction and execution process between the above devices/units is based on the same concept as the method embodiment of the present application, specific functions and technical effects thereof may be referred to in the method embodiment section, and will not be described herein.
It will be apparent to those skilled in the art that the above-described functional units are merely illustrated in terms of division for convenience and brevity, and that in practical applications, the above-described functional distribution may be performed by different functional units, i.e., the internal structure of the apparatus is divided into different functional units, so as to perform all or part of the above-described functions. The functional units in the embodiment may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit, where the integrated units may be implemented in a form of hardware or a form of a software functional unit. In addition, the specific names of the functional units are also only for distinguishing from each other, and are not used to limit the protection scope of the present application. The specific working process of the units in the above system may refer to the corresponding process in the foregoing method embodiment, which is not described herein again.
In addition, the embodiment of the application also provides a computer readable storage medium, wherein a computer program is stored in the computer readable storage medium, and the steps in the embodiment of the display panel driving method can be realized when the computer program is executed by a controller.
Embodiments of the present application provide a computer program product enabling a display device to carry out the steps of the above-described embodiments of the display panel driving method when the computer program product is run on the display device.
In the foregoing embodiments, the descriptions of the embodiments are emphasized, and in part, not described or illustrated in any particular embodiment, reference is made to the related descriptions of other embodiments.
Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.
In the embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other manners. For example, the apparatus embodiments described above are merely illustrative, e.g., the division of the units is merely a logical function division, and there may be additional divisions when actually implemented, e.g., multiple units or components may be combined or integrated into another system, or some features may be omitted or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection via interfaces, devices or units, which may be in electrical, mechanical or other forms.
The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
The above embodiments are only for illustrating the technical solution of the present application, and not for limiting the same; although the application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present application, and are intended to be included in the scope of the present application.
Claims (10)
1. A driving method of a display panel, wherein the display panel includes a plurality of pixel units including a storage capacitor and a liquid crystal capacitor, the display panel includes a plurality of sub-field sequences of time required for displaying each frame image, the sub-field sequences sequentially including a data writing period and a backlight light emitting period, the method comprising:
determining first display data required by a sub-field sequence i and second display data required by a sub-field sequence i+1, wherein i is a positive integer;
writing the first display data into the liquid crystal capacitor in the data writing period of the subfield sequence i so as to enable the pixel electrode of the pixel unit of the display panel to keep the gray scale voltage corresponding to the first display data;
temporarily storing the second display data to the storage capacitor in the backlight light-emitting period of the subfield sequence i, and providing backlight for the display panel;
and writing second display data in the storage capacitor into the liquid crystal capacitor in the data writing period of the subfield sequence i+1 so as to enable the pixel electrode of the pixel unit to keep the gray scale voltage corresponding to the second display data.
2. The driving method according to claim 1, characterized in that the method further comprises:
and erasing the first display data in the liquid crystal capacitor in the data writing period of the subfield sequence i+1.
3. The driving method according to claim 2, characterized in that the method further comprises:
erasing display data required by the sub-field sequence i-1 in the liquid crystal capacitor in the data writing period of the sub-field sequence i;
the writing the first display data into the liquid crystal capacitor in the data writing period of the subfield order i to enable the pixel electrode of the pixel unit of the display panel to maintain the gray scale voltage corresponding to the first display data includes:
and writing the first display data in the storage capacitor into the liquid crystal capacitor in the data writing period of the subfield sequence i so as to enable the pixel electrode of the pixel unit of the display panel to keep the gray scale voltage corresponding to the first display data.
4. The driving method of claim 1, wherein the subfield order further includes a liquid crystal inversion period, wherein the liquid crystal inversion period is located between the data writing period and the backlight light emitting period;
the writing the first display data into the liquid crystal capacitor in the data writing period of the subfield order i to enable the pixel electrode of the pixel unit of the display panel to maintain the gray scale voltage corresponding to the first display data includes:
writing the first display data into the liquid crystal capacitor in the data writing period of the subfield sequence i;
driving the liquid crystal capacitor to turn over corresponding liquid crystal molecules in a liquid crystal turning-over period of the subfield sequence i so as to enable pixel electrodes of pixel units of the display panel to keep gray scale voltages corresponding to the first display data;
the writing the second display data in the storage capacitor into the liquid crystal capacitor in the data writing period of the subfield sequence i+1 so that the pixel electrode of the pixel unit maintains the gray scale voltage corresponding to the second display data, including:
writing the second display data into the liquid crystal capacitor in a data writing period of the subfield sequence i+1;
and driving the liquid crystal capacitor to turn over corresponding liquid crystal molecules in the liquid crystal turning-over period of the subfield sequence i+1 so as to enable the pixel electrode of the pixel unit of the display panel to keep the gray scale voltage corresponding to the second display data.
5. A driving method according to any one of claims 1 to 4, wherein each pixel unit corresponds to a first thin film transistor and a second thin film transistor, respectively, wherein the first thin film transistor is connected to the storage capacitor, and the second thin film transistor is connected to the liquid crystal capacitor.
6. The driving method according to claim 5, wherein:
the temporarily storing the second display data in the storage capacitor in the backlight light emitting period of the subfield order i, and providing backlight for the display panel, including:
in the backlight light-emitting period of the subfield sequence i, temporarily storing the second display data to the storage capacitor by turning on the first thin film transistor, and providing backlight for the display panel;
the writing the second display data in the storage capacitor into the liquid crystal capacitor in the data writing period of the subfield sequence i+1 so that the pixel electrode of the pixel unit maintains the gray scale voltage corresponding to the second display data, including:
and in the data writing period of the subfield sequence i+1, writing the second display data to the liquid crystal capacitor by starting the second thin film transistor so as to enable the pixel electrode of the pixel unit to keep the gray scale voltage corresponding to the second display data.
7. The driving method according to claim 5, wherein the pixel unit further corresponds to a third thin film transistor;
the erasing the first display data in the liquid crystal capacitor in the data writing period of the subfield order i+1 includes:
and in the data writing period of the subfield sequence i+1, erasing the first display data in the liquid crystal capacitor by turning on a third thin film transistor.
8. A driving circuit of a display panel, the driving circuit comprising:
a storage capacitor;
a liquid crystal capacitor;
the control end of the first thin film transistor is used for being connected with a grid scanning signal, the input end of the first thin film transistor is connected with a source signal, and the output end of the first thin film transistor is connected with the storage capacitor;
the controlled end of the second thin film transistor is used for accessing a data writing signal, the input end of the second thin film transistor is connected with the storage capacitor, and the output end of the second thin film transistor is connected with the liquid crystal capacitor;
the display panel displays time required by each frame of image, the time required by the display panel comprises a plurality of sub-field sequences, the sub-field sequences sequentially comprise a data writing period and a backlight light emitting period, and a controller corresponding to the display panel is used for:
in the backlight light emitting period of the sub-field sequence i-1, a grid scanning signal is sent to the controlled end of the first thin film transistor, so that the first thin film transistor receives a source signal to determine first display data required by the sub-field sequence i, and the first display data is temporarily stored in the storage capacitor;
in the data writing period of the subfield sequence i, a data writing signal is sent to the controlled end of the second thin film transistor so as to write first display data in the storage capacitor into the liquid crystal capacitor, and the pixel electrode of the pixel unit of the display panel keeps the gray scale voltage corresponding to the first display data;
in the backlight light emitting period of the sub-field sequence i, a grid scanning signal is sent to the controlled end of the first thin film transistor, so that the first thin film transistor receives a source signal to determine second display data required by the sub-field sequence i+1, and the second display data is temporarily stored in the storage capacitor;
in the data writing period of the subfield sequence i+1, a data writing signal is sent to the controlled end of the second thin film transistor so as to write second display data in the storage capacitor into the liquid crystal capacitor; and sending a data erasing signal to the third thin film transistor so as to erase the first display data in the liquid crystal capacitor, so that the pixel electrode of the pixel unit of the display panel maintains the gray scale voltage corresponding to the second display data.
9. The drive circuit of claim 8, wherein the drive circuit further comprises:
the controlled end of the third thin film transistor is used for being connected with a data erasing signal, the input end of the third thin film transistor is connected with the liquid crystal capacitor, and the output end of the third thin film transistor is connected with the common electrode;
wherein, the controller that display panel corresponds is still used for:
transmitting a data erasing signal to the third thin film transistor in the data writing period of the sub-field sequence i so as to erase the display data required by the sub-field sequence i-1 in the liquid crystal capacitor;
and in the data writing period of the subfield sequence, sending a data erasing signal to the third thin film transistor so as to erase the first display data in the liquid crystal capacitor.
10. A display device comprising a display panel, a memory, a controller and a computer program stored in the memory and executable on the controller, the controller implementing the steps of the driving method according to any one of claims 1 to 7 when the computer program is executed.
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