CN110322833B - Display driving method, method for controlling light emission of display panel and display panel - Google Patents
Display driving method, method for controlling light emission of display panel and display panel Download PDFInfo
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- CN110322833B CN110322833B CN201810276398.XA CN201810276398A CN110322833B CN 110322833 B CN110322833 B CN 110322833B CN 201810276398 A CN201810276398 A CN 201810276398A CN 110322833 B CN110322833 B CN 110322833B
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- 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]
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Abstract
The embodiment of the invention discloses a display driving method, a method for controlling light emission of a display panel and the display panel, wherein the display driving method comprises the following steps: determining black insertion times when the panel is driven to emit light, if the times are not zero, determining transmission time of a light-emitting control signal according to the time for scanning one line of pixels by a scanning signal, the number of lines of an effective display area and the number of lines of a VBlank area, determining a driving time sequence of the light-emitting control signal according to the transmission time, and driving the panel to emit light under the control of the time sequence. The transmission time can be used for controlling the number of lines of the light-emitting control signal transmitted in one frame time length to be the number of lines of the effective display area, so that the light-emitting control signal can only be transmitted from the first line to the last line of the effective display area in one frame time length, and the light-emitting control signal returns to the first line again when the next frame time length arrives, so that the number of the light-emitting lines cannot enter the VBlank area, and the number of the light-emitting lines in the effective display area is unchanged at any moment, thereby avoiding the brightness change caused by black insertion and improving the display effect.
Description
Technical Field
The invention relates to the technical field of display, in particular to a display driving method, a method for controlling light emission of a display panel and the display panel.
Background
With the development of display technology, VR (Virtual Reality) products are rapidly coming into the lives of people. At present, the VR products generally adopt an OLED (Organic Light-Emitting Diode) display panel, and in order to avoid a phenomenon of smearing when displaying a screen, a black insertion technique is generally adopted when driving the OLED. Black insertion means that during a display period of a frame, a row of pixels is controlled not to emit light for a period of time, and to emit light normally for other periods of time, so that, since the rows of pixels are scanned line by line in the order from top to bottom by the light emission control signal, some rows of pixels always emit light at the same time, and other rows of pixels do not emit light.
In the prior art, the scanning signal for controlling data writing also scans rows of pixels line by line in sequence, and a vertical blanking interval, also called VBlank area, exists between the time when the last row of pixels in the effective display area writes data of a previous frame of picture and the time when the first row of pixels writes data of a next frame of picture, and the number of lines in the VBlank area is equal to the number of lines of pixels that can be swept by the scanning signal in the duration of the vertical blanking interval. Under the black insertion display mode, if the number of light emitting lines enters the VBlank area of the vertical blanking interval, the actual number of light emitting lines of the display panel may change, thereby causing a change in ELVDD current, and further generating IR drop, causing a change in brightness of a display screen, and further affecting a display effect, and causing poor user experience.
In summary, there is a need for a display driving method to solve the technical problems of uneven display brightness and poor display effect when the OLED display panel is driven to display by using the black insertion technique in the prior art.
Disclosure of Invention
The invention provides a display driving method, a method for controlling a display panel to emit light and the display panel, which are used for solving the technical problems of uneven display brightness and poor display effect when a black insertion technology is used for driving an OLED display panel to display in the prior art.
The embodiment of the invention provides a display driving method, which is applied to an Organic Light Emitting Diode (OLED) display panel; the method comprises the following steps:
determining the black insertion times in a frame of picture when the OLED display panel is driven to emit light;
if the black insertion times are not zero, determining the transmission time of the light-emitting control signal according to the time of scanning a line of pixels by the scanning signal, the line number of the effective display area of the OLED display panel and the line number of the vertical blanking interval VBlank area of the OLED display panel; the transmission time is used for controlling the number of pixel lines of the light-emitting control signal transmitted in one frame duration to be equal to the number of pixel lines of the effective display area;
and determining the driving time sequence of the light-emitting control signal according to the transmission time of the light-emitting control signal, and driving the OLED display panel to emit light under the control of the driving time sequence.
Alternatively, the transmission time of the light emission control signal is determined by the following formula:
wherein Tre is a transmission time of the light emission control signal, m is a number of lines of the effective display area, n is a number of lines of the VBlank area, and TsThe time for scanning a row of pixels for the scanning signal.
Based on the same inventive concept, an embodiment of the present invention further provides a method for controlling light emission of a display panel, where the method includes:
acquiring a driving time sequence of a light-emitting control signal; the transmission time of the light-emitting control signal in the driving sequence is determined according to the time for scanning one row of pixels by a scanning signal, the number of rows of an effective display area of the OLED display panel and the number of rows of a vertical blanking interval VBlank area of the OLED display panel, and the transmission time is used for controlling the number of rows of pixels transmitted by the light-emitting control signal in one frame time length to be equal to the number of rows of pixels of the effective display area;
and controlling each row of pixels in the effective display area of the OLED display panel to emit light under the driving of the driving time sequence.
The embodiment of the invention provides a display panel, which comprises a memory and a processor, wherein the memory is used for storing program instructions, and the processor is used for calling the program instructions stored in the memory and executing any one of the methods according to the obtained program.
Embodiments of the present invention provide a computer storage medium, where computer-executable instructions are stored, and the computer-executable instructions are configured to cause a computer to perform any one of the methods described above.
Another embodiment of the present invention also provides a display driving method applied to an organic light emitting diode OLED display panel, the method including:
determining the number of black insertion times in a frame of picture when the OLED is driven to emit light and the period of the light-emitting control signal corresponding to the number of black insertion times according to the number of lines of an effective display area of the OLED display panel and the number of lines of a vertical blanking interval VBlank area; the black insertion times are used for controlling the number of lines emitting light in the VBlank area to be unchanged at any time;
and determining the driving time sequence of the light-emitting control signal according to the black insertion times and/or the period of the light-emitting control signal, and driving the OLED display panel to emit light under the control of the driving time sequence.
Optionally, the black insertion number is equal to a ratio of the total number of lines of the effective display area and the VBlank area to the number of lines of the VBlank area.
Optionally, a period of the light emission control signal is equal to a product of the number of lines of the VBlank area and a time for which the scan signal scans one line of pixels.
Based on the same inventive concept, another embodiment of the present invention also provides a method of controlling light emission of a display panel, the method including:
acquiring a driving time sequence of a light-emitting control signal; the period of the light-emitting control signal in the driving sequence is determined according to the time for scanning one row of pixels by a scanning signal, the number of rows of an effective display area of the OLED display panel and the number of rows of a VBlank area of a vertical blanking interval of the OLED display panel, and the period is used for controlling the number of rows emitting light in the VBlank area to be unchanged at any moment;
and controlling each row of pixels in the effective display area of the OLED display panel to emit light under the driving of the driving time sequence.
Another embodiment of the present invention further provides a display panel, which includes a memory and a processor, wherein the memory is used for storing program instructions, and the processor is used for calling the program instructions stored in the memory and executing any one of the above methods according to the obtained program.
Another embodiment of the present invention provides a computer storage medium having stored thereon computer-executable instructions for causing a computer to perform any one of the methods described above.
In the embodiment of the invention, the black insertion times in a frame of picture when the OLED display panel is driven to emit light are determined, if the black insertion times are not zero, the transmission time of the light-emitting control signal is determined according to the time of scanning a line of pixels by a scanning signal, the line number of an effective display area and the line number of a vertical blanking interval VBlank area, the driving time sequence of the light-emitting control signal is determined according to the transmission time, and the OLED display panel is driven to emit light under the control of the driving time sequence.
The transmission time of the light-emitting control signal can be used for controlling the number of pixel lines transmitted by the light-emitting control signal in one frame time length to be equal to the number of pixel lines of the effective display area, so that the light-emitting control signal in one frame time length can be just transmitted from the first line of pixels to the last line of pixels of the effective display area, and the light-emitting control signal returns to the first line again when the next frame time length arrives, so that the problem that the number of the light-emitting lines enters the Vblank area does not exist, the number of the pixel lines emitting light in the effective display area is unchanged at any moment, and the technical problem that the display effect is poor due to the change of the display brightness caused by black insertion is solved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
Fig. 1 is a schematic diagram of a pixel matrix of an OLED display panel according to an embodiment of the invention;
FIG. 2a is a schematic diagram of the light emission of the display panel before the number of light emission lines enters the VBlank region in the prior art;
FIG. 2b is a schematic diagram of the prior art after the number of light emitting lines enters the VBlank region;
FIG. 2c is a schematic diagram of the prior art when the number of rows of light-emitting lines completely covers the VBlank region;
FIG. 3 is a schematic diagram illustrating the variation of the ELVDD current in the prior art;
fig. 4 is a schematic flowchart of a display driving method according to an embodiment of the invention;
FIG. 5a is a schematic diagram of driving timing sequences of a scan signal and a light-emitting control signal when the number of black insertions is one according to a first embodiment of the present invention;
FIG. 5b is a schematic diagram illustrating driving timing sequences of the scan signal and the emission control signal when the black insertion number is two in the first embodiment of the present invention;
fig. 6 is a flowchart illustrating a method for controlling light emission of a display panel according to an embodiment of the invention;
fig. 7 is a schematic flowchart of a display driving method according to a second embodiment of the present invention;
FIG. 8 is a schematic diagram illustrating driving timing sequences of scan signals and light-emitting control signals according to a second embodiment of the present invention;
fig. 9 is a schematic diagram of the light emission of the OLED display panel after the period of the light emission control signal set by the method in the second embodiment of the invention;
fig. 10 is a flowchart illustrating a method for controlling light emission of a display panel according to a second embodiment of the present invention;
fig. 11 is a schematic structural diagram of a display panel according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, 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.
The embodiments of the present invention will be described in further detail with reference to the drawings attached hereto.
Fig. 1 is a schematic diagram of a pixel matrix of an OLED display panel according to an embodiment of the present invention, and as shown in fig. 1, it is assumed that the OLED display panel includes a pixel matrix with N rows and M columns, in the pixel matrix, each row of pixels shares a row electrode (also referred to as a scan electrode), a row driving unit inputs a row signal to each row of pixels through the row electrode, each column of pixels shares a column electrode (also referred to as a data electrode), and a column driving unit (also referred to as a data driving unit) inputs a column signal to each column of pixels through the column electrode.
In the embodiment of the present invention, the row driving unit may be further divided into a scan driving unit and a light emitting driving unit, which are respectively used for inputting the scan signal Sn and the light emitting control signal En. The scanning signal Sn is used for controlling data to be written into a row of pixels, and in the time sequence of the scanning signal Sn, low level control is written in, and high level control is not written in; the light emission control signal En is used to control one row of pixels to emit light, and in the timing of the light emission control signal En, a low level indicates that light emission is controlled, and a high level indicates that no light emission is controlled. In general, the time period of En (i.e., the duration occupied by the low level in one period of En) is an integral multiple of the time period of Sn (i.e., the duration occupied by the low level in one period of Sn), which means that after data of a plurality of rows of pixels are written, the pixels emit light together.
Assuming that the number of pixel lines in the effective display area is m lines, and the VBlank area is n lines, in the prior art, in the black insertion mode, the number of theoretical lighting lines in one frame of picture is equal to (m + n) × t. Wherein t is a black insertion ratio, that is, a ratio of a light emitting time to a frame time in a frame time length for one line of pixels.
When the number of light-emitting lines enters the VBlank area, but before the first line of pixels in the effective display area starts to emit light, the actual number of light-emitting lines will gradually decrease. Fig. 2a is a schematic diagram of light emission in the display panel before the number of light emission lines enters the VBlank area, fig. 2b is a schematic diagram of light emission after the number of light emission lines enters the VBlank area, and fig. 2c is a schematic diagram of light emission when the number of light emission lines completely covers the VBlank area.
As shown in fig. 2a to 2c, 201 is the effective display area, the shaded portion 202 is the actual number of rows of light emitting in the effective display area, and 203 is the VBlank area. In fig. 2a, the number of actual light emission lines is equal to the number of theoretical light emission lines. As shown in fig. 2b, the number of light-emitting lines initially enters the VBlank area, at this time, the first line of pixels has not yet started to emit light, and the actual number of light-emitting lines is smaller than the theoretical number of light-emitting lines. With the change of time, the actual light emission gradually decreases, and the number of light emission lines gradually covers the VBlank area, even completely covers the VBlank area, until the number of actual light emission lines remains unchanged after the first line of pixels starts to emit light. After the display of the previous frame of picture is finished, the actual number of the luminous lines starts to increase gradually until the number of the luminous lines leaves the VBlank area. In this process, the ELVDD current of each pixel in the effective display area changes regularly as shown in fig. 3, which causes the brightness of the display panel to change, resulting in mura defects.
In order to solve the above problem, a first embodiment of the present invention provides a display driving method, as shown in fig. 4, the method includes the following steps S401 to S403:
step S401: determining the black insertion times in a frame of picture when the OLED display panel is driven to emit light;
step S402: if the black insertion times are not zero, determining the transmission time of the light-emitting control signal according to the time of scanning a line of pixels by the scanning signal, the line number of the effective display area of the OLED display panel and the line number of the vertical blanking interval VBlank area of the OLED display panel; the transmission time is used for controlling the number of pixel lines of the light-emitting control signal transmitted in one frame duration to be equal to the number of pixel lines of the effective display area;
step S403: and determining the driving time sequence of the light-emitting control signal according to the transmission time of the light-emitting control signal, and driving the OLED display panel to emit light under the control of the driving time sequence.
Specifically, in the embodiment of the present invention, if it is determined that the black insertion needs to be performed once or multiple times in one frame of the display screen when the display panel displays the screen, the transmission time of the light emission control signal may be determined according to the following formula two:
wherein Tre is the transmission time of the light emission control signal, m is the number of lines of the effective display area, n is the number of lines of the VBlank area, and TsThe time for scanning one row of pixels for the scan signal may be determined according to the resolution and scan frequency of the display panel.
Fig. 5a and 5b are schematic diagrams illustrating driving timing of the scan signal and the light emission control signal after the transmission time of the light emission control signal is set using the above formula two. In fig. 5a, the number of lines in the effective display area is 16 lines, the number of lines in the VBlank area is 4 lines, and assuming that the duration of one frame is 20 time units, the time T for scanning one line of pixels by the scanning signal is T s1/20 equal to the duration of a frame, a frameIn the case where black insertion is performed only once in the screen and the black insertion ratio is 2/5 (i.e., the light emission time period of one line of pixels is 8 time units and the non-light emission time period is equal to 12 time units within one frame time period), it is determined that the transmission time Tre of the light emission control signal is 1.25 Ts. As can be seen from fig. 5a, in the duration of one frame, the light-emitting control signal can be exactly transmitted from the first row of pixels to the 16 th row of pixels, and the light-emitting control signal returns to the first row again when the next frame arrives, therefore, compared with the prior art in which the transmission time of the light-emitting control signal is set to be Ts or an integral multiple of Ts, in the first embodiment of the present invention, there is no problem that the number of light-emitting rows enters the Vblank region, and when the previous frame is converted into the next frame, at any time, the number of pixel rows actually emitting light in the effective display region is substantially unchanged.
In fig. 5b, the number of black insertion times in one frame is changed to two, and the black insertion ratio is still maintained at 3:2, according to the second formula, the transmission time Tre of the light-emitting control signal is set to 1.25Ts, when the previous frame is converted to the next frame, the problem that the number of light-emitting lines enters the VBlank area does not exist, and at any time, the number of pixel lines actually emitting light in the effective display area is not changed. Therefore, it can be seen that the same applies to the case where the number of black insertions is multiple according to the second formula.
In an actual application scenario, the number of pixel lines in the effective display area is far greater than 16 lines, and the black insertion times and the black insertion ratio can also be specifically set by a person skilled in the art according to actual needs, but under the condition that other time sequence parameters of the scanning signal and the light-emitting control signal are not changed, the transmission time of the light-emitting control signal is set by the method provided in the first embodiment of the invention, so that the technical problem that the brightness of a display picture is changed due to the change of the ELVDD current of each line of pixels when the number of light-emitting lines enters the VBlank area can be solved.
An embodiment of the present invention further provides a method for controlling light emission of a display panel, as shown in fig. 6, the method includes the following steps S601 to S602:
step S601: acquiring a driving time sequence of a light-emitting control signal; the transmission time of the light-emitting control signal in the driving sequence is determined according to the time for scanning one row of pixels by a scanning signal, the number of rows of an effective display area of the OLED display panel and the number of rows of a vertical blanking interval VBlank area of the OLED display panel, and the transmission time is used for controlling the number of rows of pixels transmitted by the light-emitting control signal in one frame time length to be equal to the number of rows of pixels of the effective display area;
step S602: and controlling each row of pixels in the effective display area of the OLED display panel to emit light under the driving of the driving time sequence.
In step S601, the parameter of the transmission time of the light-emitting control signal is specifically determined by formula two, which is not described herein again.
As shown in fig. 7, the second embodiment of the present invention provides another display driving method, which includes the following steps S701 to S702:
step S701: determining the number of black insertion times in a frame of picture when the OLED is driven to emit light and the period of the light-emitting control signal corresponding to the number of black insertion times according to the number of lines of an effective display area of the OLED display panel and the number of lines of a vertical blanking interval VBlank area; the black insertion times are used for controlling the number of lines emitting light in the VBlank area to be unchanged at any time;
and S702, determining the driving time sequence of the light-emitting control signal according to the black insertion times and/or the period of the light-emitting control signal, and driving the OLED display panel to emit light under the control of the driving time sequence.
Specifically, in step S701, the number of black insertion times and the period of the light emission control signal are determined specifically by the following formulas three and four:
wherein N is the black insertion times, and m is the effective display areaN is the number of lines of VBlank area, TeFor the period of the light emission control signal, TsThe time for scanning one row of pixels for the scan signal may be determined according to the resolution and scan frequency of the display panel.
In the second embodiment of the present invention, a manner of setting black insertion times is adopted to solve a technical problem that the actual number of lighting lines in the effective display area changes when the number of lighting lines enters the VBlank area. Thus, the period of the light emission control signal is set to nTsThen, the VBlank area contains a complete En period, so that the actual number of light emitting lines in the effective display area remains unchanged at any time, the ELVDD current of the pixels remains unchanged, and the brightness of the whole display panel does not change when displaying the picture.
Fig. 8 is a diagram schematically illustrating driving timings of the scan signal and the light emission control signal after a period of the light emission control signal set by the method in the second embodiment of the present invention. In fig. 8, the number of lines in the effective display area is 16 lines, the number of lines in the VBlank area is 4 lines, and assuming that the duration of one frame is 20 time units, the time T for scanning one line of pixels by the scanning signal iss1/20 equal to one frame duration, the black insertion times are 5 times and the period T of the light-emitting control signal is determined according to the above formula III and formula IVe＝4TsWhen the black insertion ratio is set to 3/4, as can be seen from fig. 8, when the previous frame is shifted to the next frame, the actual number of light-emitting lines in the effective display area is always kept unchanged by 12 lines.
Fig. 9 schematically shows the light emission of the OLED display panel after the period of the light emission control signal set by the method in the second embodiment of the present invention, where 901 is the effective display area, 902 is the VBlank area, and 903 and 904 are the numbers of pixel rows that do not emit light and emit light, respectively, in one period of the light emission control signal En in fig. 9. As shown in fig. 9, since the VBlank area includes a complete En period, the number of pixel rows emitting light and non-emitting light in the VBlank area is always fixed, and thus the number of pixel rows actually emitting light in the effective display area is also fixed.
The second embodiment of the present invention further provides another method for controlling light emission of a display panel, as shown in fig. 10, the method includes the following steps S1001 to S1002:
step S1001: acquiring a driving time sequence of a light-emitting control signal; the period of the light-emitting control signal in the driving sequence is determined according to the time for scanning one row of pixels by a scanning signal, the number of rows of an effective display area of the OLED display panel and the number of rows of a VBlank area of a vertical blanking interval of the OLED display panel, and the period is used for controlling the number of rows emitting light in the VBlank area to be unchanged at any moment;
step S1002: and controlling each row of pixels in the effective display area of the OLED display panel to emit light under the driving of the driving time sequence.
Specifically, in step S1001, the period of the light-emitting control signal is specifically determined according to the method in the above formula three and formula four, and details are not repeated here.
Based on the same inventive concept, the embodiment of the present invention further provides another display panel, as shown in fig. 11, the display panel 1100 may include a Central Processing Unit (CPU) 1101, a memory 1102, an input/output device 1103, a bus system 1104, and the like. The input device may include a keyboard, a mouse, a touch screen, and the like, and the output device may include a Display device such as a Liquid Crystal Display (LCD), a Cathode Ray Tube (CRT), and the like.
The memory may include Read Only Memory (ROM) and Random Access Memory (RAM), and provides the processor with program instructions and data stored in the memory. In an embodiment of the present invention, the memory may be used to store a program of the above-described display driving method and/or method of controlling light emission of the display panel.
The processor is used for executing the display driving method and/or the method for controlling the light emission of the display panel according to the obtained program instructions by calling the program instructions stored in the memory.
Based on the same inventive concept, embodiments of the present invention provide a computer storage medium for storing computer program instructions for the display panel, which includes a program for executing the display driving method and/or the method of controlling light emission of the display panel.
The computer storage media may be any available media or data storage device that can be accessed by a computer, including, but not limited to, magnetic memory (e.g., floppy disks, hard disks, magnetic tape, magneto-optical disks (MOs), etc.), optical memory (e.g., CDs, DVDs, BDs, HVDs, etc.), and semiconductor memory (e.g., ROMs, EPROMs, EEPROMs, non-volatile memory (NAND FLASH), Solid State Disks (SSDs)), etc.
From the above, it can be seen that:
in the embodiment of the invention, the black insertion times in a frame of picture when the OLED display panel is driven to emit light are determined, if the black insertion times are not zero, the transmission time of the light-emitting control signal is determined according to the time of scanning a line of pixels by a scanning signal, the line number of an effective display area and the line number of a vertical blanking interval VBlank area, the driving time sequence of the light-emitting control signal is determined according to the transmission time, and the OLED display panel is driven to emit light under the control of the driving time sequence.
The transmission time of the light-emitting control signal can be used for controlling the number of pixel lines transmitted by the light-emitting control signal in one frame time length to be equal to the number of pixel lines of the effective display area, so that the light-emitting control signal in one frame time length can only be transmitted from the first line of pixels to the last line of pixels of the effective display area, and the light-emitting control signal returns to the first line again when the next frame time length arrives, so that the problem that the number of the light-emitting lines enters the Vblank area does not exist, the number of the pixel lines emitting light in the effective display area is unchanged at any moment, and the technical problem that the display effect is poor due to the change of the display brightness caused by black insertion is solved.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart block or blocks and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While alternative embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following appended claims be interpreted as including alternative embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (11)
1. A display driving method is applied to an Organic Light Emitting Diode (OLED) display panel and comprises the following steps:
determining the black insertion times in a frame of picture when the OLED display panel is driven to emit light;
if the black insertion times are not zero, determining the transmission time of the light-emitting control signal according to the time of scanning a line of pixels by the scanning signal, the line number of the effective display area of the OLED display panel and the line number of the vertical blanking interval VBlank area of the OLED display panel; the transmission time of the light-emitting control signal is used for controlling the number of pixel lines of the light-emitting control signal transmitted in one frame duration to be equal to the number of pixel lines of the effective display area, namely, the transmission time of the light-emitting control signal is the transmission time of the light-emitting control signal in one line of pixels;
and determining the driving time sequence of the light-emitting control signal according to the transmission time of the light-emitting control signal, and driving the OLED display panel to emit light under the control of the driving time sequence.
2. The method according to claim 1, wherein the transmission time of the light emission control signal is determined by the following formula:
wherein Tre is a transmission time of the light emission control signal, m is a number of lines of the effective display area, n is a number of lines of the VBlank area, and TsThe time for scanning a row of pixels for the scanning signal.
3. A method of controlling light emission of a display panel, the method comprising:
acquiring a driving time sequence of a light-emitting control signal; the transmission time of the light-emitting control signal in the driving sequence is determined according to the time for scanning one row of pixels by a scanning signal, the number of rows of an effective display area of an OLED display panel, and the number of rows of a vertical blanking interval VBlank area of the OLED display panel, and the transmission time of the light-emitting control signal is used for controlling the number of rows of pixels transmitted by the light-emitting control signal in one frame time duration to be equal to the number of rows of pixels of the effective display area, that is, the transmission time of the light-emitting control signal is the transmission time of the light-emitting control signal in one row of pixels;
and controlling each row of pixels in the effective display area of the OLED display panel to emit light under the driving of the driving time sequence.
4. A display driving method is applied to an Organic Light Emitting Diode (OLED) display panel and comprises the following steps:
determining the black insertion times in a frame of picture when the OLED is driven to emit light according to the line number of an effective display area of the OLED display panel and the line number of a vertical blanking interval VBlank area, and determining the period of a light-emitting control signal according to the black insertion times and the time of scanning one line of pixels by a scanning signal; the black insertion times are used for controlling the number of lines emitting light in the VBlank area to be unchanged at any time;
and determining the driving time sequence of the light-emitting control signal according to the black insertion times and/or the period of the light-emitting control signal, and driving the OLED display panel to emit light under the control of the driving time sequence.
5. The method of claim 4, wherein the number of black insertions is equal to the ratio of the number of rows in the active display area to the total number of rows in the VBlank area to the number of rows in the VBlank area.
6. The method of claim 5, wherein the period of the emission control signal is equal to the product of the number of rows of the VBlank region and the time for the scan signal to scan one row of pixels.
7. A method of controlling light emission of a display panel, the method comprising:
acquiring a driving time sequence of a light-emitting control signal; wherein a period of the light emission control signal in the driving timing is determined according to the following formula:
wherein N is the number of black insertions, TsScanning a line of pixels for a scanning signal, m being the number of lines of the effective display area of the OLED display panel, n being the number of lines of the vertical blanking interval VBlank area of the OLED display panel, TeThe period of the light-emitting control signal is used for controlling the number of rows emitting light in the VBlank area to be unchanged at any moment;
and controlling each row of pixels in the effective display area of the OLED display panel to emit light under the driving of the driving time sequence.
8. A display panel, comprising:
a memory for storing program instructions;
a processor for calling program instructions stored in said memory to execute the method as claimed in claim 3 in accordance with the obtained program.
9. A computer storage medium having computer-executable instructions stored thereon for causing a computer to perform the method of claim 3.
10. A display panel, comprising:
a memory for storing program instructions;
a processor for calling program instructions stored in said memory to execute the method as claimed in claim 7 in accordance with the obtained program.
11. A computer storage medium having computer-executable instructions stored thereon for causing a computer to perform the method of claim 7.
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| CN111292674A (en) * | 2020-02-26 | 2020-06-16 | 福建华佳彩有限公司 | Display driving method and device with high image quality |
| CN112735335B (en) * | 2020-11-30 | 2022-04-29 | 武汉天马微电子有限公司 | Organic light-emitting display panel, display device and driving method |
| CN112885299B (en) * | 2021-01-22 | 2022-06-24 | 合肥京东方卓印科技有限公司 | Display brightness compensation method, compensation circuit and display device |
| CN113012652B (en) | 2021-03-09 | 2022-11-08 | Tcl华星光电技术有限公司 | Backlight driving circuit and liquid crystal display device |
| CN113611248B (en) * | 2021-08-11 | 2023-08-11 | 合肥京东方卓印科技有限公司 | Display panel, driving method of switch circuit of display panel and display device |
| CN113920939B (en) * | 2021-10-28 | 2022-09-16 | 合肥京东方卓印科技有限公司 | Brightness compensation method, brightness compensation module and display device |
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| KR100707628B1 (en) * | 2005-03-31 | 2007-04-13 | 삼성에스디아이 주식회사 | Light Emitting Display and Driving Method Thereof |
| KR100629585B1 (en) * | 2005-03-31 | 2006-09-27 | 삼성에스디아이 주식회사 | Light emitting display and driving method thereof |
| KR20100042798A (en) * | 2008-10-17 | 2010-04-27 | 삼성모바일디스플레이주식회사 | Organic light emitting display device |
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| CN107481667B (en) * | 2017-08-25 | 2019-11-05 | 上海天马有机发光显示技术有限公司 | A kind of organic electroluminescent display panel, its driving method and display device |
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