CN111161663A - Driving method and testing method of display panel and display panel - Google Patents
Driving method and testing method of display panel and display panel Download PDFInfo
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- CN111161663A CN111161663A CN202010010656.7A CN202010010656A CN111161663A CN 111161663 A CN111161663 A CN 111161663A CN 202010010656 A CN202010010656 A CN 202010010656A CN 111161663 A CN111161663 A CN 111161663A
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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
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- 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
- G09G3/006—Electronic inspection or testing of displays and display drivers, e.g. of LED or LCD displays
Abstract
The embodiment of the invention discloses a driving method, a driving device and a display panel of the display panel, wherein the driving method comprises the steps of dividing a maximum gray scale section displayed by the display panel into a plurality of gray stages, outputting corresponding data signals to the display panel according to each gray scale in the gray stages to drive the display panel to display in the corresponding gray scale section, adjusting reference signals which are output to the display panel and correspond to a single gray stage to obtain a plurality of uniform brightness values corresponding to the gray stage, and obtaining reference signals corresponding to the maximum uniform brightness value in the plurality of uniform brightness values; the display panel is driven to display in the corresponding gray scale section according to the reference signal corresponding to the maximum uniform brightness value, so that the charging rate of the pixel circuit is higher and the uniform brightness value is higher when each gray scale section displays, the difference of the uniform brightness values of different gray scales is further reduced, the display uniformity of the display panel under different gray scales is further improved, and the display effect is improved.
Description
Technical Field
The embodiment of the invention relates to the technical field of display, in particular to a display panel and a driving method and a testing method thereof.
Background
With the development of display technology, the requirements on the quality of display pictures are higher and higher.
With the increase of display size and the improvement of display resolution, the number of pixel circuits in a display screen is increasing. Because different driving voltages are needed for displaying different gray scales, the charging rates of the pixel circuits at different gray scales are inconsistent, and the inconsistency causes poor brightness uniformity at different gray scales, thereby influencing the subjective feeling of display.
Disclosure of Invention
The invention provides a driving method and a testing method of a display panel and the display panel, which are used for improving the charging rate of the display panel to a pixel circuit, improving the display uniformity of the display panel and improving the display effect.
In a first aspect, an embodiment of the present invention provides a method for driving a display panel, including:
dividing the maximum gray scale section displayed by the display panel into a plurality of gray stages;
outputting corresponding data signals to the display panel according to each gray scale in the gray stage so as to drive the display panel to display in the corresponding gray scale section;
adjusting a reference signal which is output to the display panel and corresponds to a single gray stage to obtain a plurality of uniform brightness values corresponding to the gray stage, and obtaining a reference signal corresponding to the maximum uniform brightness value in the plurality of uniform brightness values;
and driving the display panel to display in the corresponding gray scale section according to the reference signal corresponding to the maximum brightness uniform value.
Optionally, dividing the maximum gray scale segment displayed by the display panel into a plurality of gray scale segments includes:
dividing the lowest gray scale to the first intermediate gray scale in the maximum gray stage into m gray scale sections, and dividing the highest gray scale in the first intermediate gray scale to the maximum gray stage into n gray stages;
wherein m > n;
Optionally, adjusting the reference signal output to the display panel and corresponding to a single gray stage to obtain a plurality of uniform brightness values corresponding to the gray stage, and obtaining the reference signal corresponding to the maximum uniform brightness value of the plurality of uniform brightness values includes:
selecting any gray scale in a single gray stage, and measuring a first brightness uniform value of the display panel under an original reference signal; the original reference signal is a preset fixed reference voltage;
adjusting the reference signal to gradually increase or decrease the reference signal to the data voltage corresponding to the selected gray scale, and measuring a second uniform brightness value of the display panel at the selected gray scale to obtain a plurality of second uniform brightness values under each reference signal;
the maximum luminance uniform value among the first luminance uniform value and the plurality of second luminance uniform values is acquired.
Optionally, adjusting the reference signal output to the display panel and corresponding to a single gray stage to obtain a plurality of uniform brightness values corresponding to the gray stage, and obtaining the reference signal corresponding to the maximum uniform brightness value of the plurality of uniform brightness values includes:
selecting any gray scale in the gray stage, and measuring a first brightness uniform value of the display panel under an original reference signal; the original reference signal is a preset fixed reference voltage;
adjusting the reference signal to gradually increase or decrease the data voltage of the reference signal from the selected gray scale, and measuring a second uniform brightness value of the display panel at the selected gray scale to obtain a plurality of second uniform brightness values under each reference signal;
the maximum luminance uniform value among the first luminance uniform value and the plurality of second luminance uniform values is acquired.
Optionally, selecting any gray level in the gray stage includes:
selecting a second intermediate gray scale in a single gray stage; wherein the second intermediate gray level represents an average gray level of the minimum gray level in the gray phase and the maximum gray level in the gray level segment.
Optionally, each gray scale segment includes a plurality of gray scales therein.
Optionally, each gray level segment includes a gray level.
Optionally, the data signal is a data voltage; the minimum data voltage corresponding to the gray scale in the first gray stage is greater than the maximum data voltage corresponding to the gray scale in the second gray stage; the first reference signal corresponding to the first gray scale section is greater than the second reference signal corresponding to the second gray scale section; the first ash stage and the second ash stage are two ash stages within the maximum ash stage.
In a second aspect, an embodiment of the present invention further provides a driving apparatus for a display panel, including:
the gray scale dividing module is used for dividing the maximum gray scale section displayed by the display panel into a plurality of gray stages;
the data driving module is used for outputting corresponding data signals to the display panel according to each gray scale in the gray stage so as to drive the display panel to display in the corresponding gray scale section;
the reference acquisition module is used for adjusting the reference signal which is output to the display panel and corresponds to a single gray stage to acquire a plurality of uniform brightness values corresponding to the gray stage and acquiring the reference signal corresponding to the maximum uniform brightness value in the plurality of uniform brightness values;
and the reference driving module is used for driving the display panel to display in the corresponding gray scale section according to the reference signal corresponding to the maximum brightness uniform value.
In a third aspect, an embodiment of the present invention further provides a display apparatus, including a display panel and the driving apparatus for the display panel provided in the first aspect, where the display panel is electrically connected to the driving apparatus, the driving apparatus outputs a data signal and a reference signal to the display panel, and the display panel drives a light emitting device in the display panel to emit light according to the received data signal and reference signal.
The embodiment of the invention provides a driving method, a driving device and a display panel of the display panel, wherein the maximum gray scale section displayed by the display panel is divided into a plurality of gray stages, a reference signal which is output to the display panel and corresponds to a single gray stage is adjusted to obtain a plurality of uniform brightness values corresponding to the gray stages, and a reference signal which corresponds to the maximum uniform brightness value in the plurality of uniform brightness values is obtained; the display panel is driven to display in the corresponding gray scale section according to the reference signal corresponding to the maximum uniform brightness value, so that the charging rate of the pixel circuit is higher and the uniform brightness value is higher when each gray scale section displays, the difference of the uniform brightness values of different gray scales is further reduced, the display uniformity of the display panel under different gray scales is further improved, and the display effect is improved.
Drawings
Fig. 1 is a flowchart of a driving method of a display panel according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a pixel circuit commonly used in the prior art;
FIG. 3 is a flowchart of another driving method of a display panel according to an embodiment of the present invention;
FIG. 4 is a flowchart illustrating another driving method of a display panel according to an embodiment of the present invention;
FIG. 5 is a flowchart illustrating another driving method of a display panel according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of a driving apparatus of a display panel according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of a display device according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
As described in the background art, different driving voltages are required for displaying different gray scales, so that the charging rates of the pixel circuits at different gray scales are not consistent, and the brightness uniformity at different gray scales is poor due to the inconsistency. The inventors have found that the above problems occur because a plurality of pixel circuits are generally included in the conventional display panel, and when the pixel circuits are driven, an initialization phase and a data writing phase are generally included, and the data writing phase is performed after the initialization phase. In the initialization stage, an initialization voltage is usually written into the gate of the driving transistor to initialize the gate potential of the driving transistor; in the data writing stage, a data voltage corresponding to a display gray scale of the light emitting device in the pixel circuit is written to the gate of the driving transistor. When driving a pixel circuit in a conventional display panel, the initialization voltage is usually a fixed value. Because the data voltages corresponding to different display gray scales are different in size, the driving transistors in different pixel circuits written with the same initialization voltage in the initialization stage may need to be written with different data voltages in the data writing stage. For example, the driving transistors of the pixel circuits corresponding to some data voltage ranges may completely write the data voltage, and the driving transistors of the pixel circuits corresponding to other data voltage ranges may not write the data voltage sufficiently, that is, the data voltage may not be completely written, so that there may be a difference between the uniformity of each light emitting device in each pixel circuit to which one data voltage is written and the uniformity of each light emitting device in each pixel circuit to which another data voltage is written, that is, the luminance uniformity at different gray scales is poor, and the display effect is affected.
For the above reasons, an embodiment of the present invention provides a driving method of a display panel, and fig. 1 is a flowchart of the driving method of the display panel provided by the embodiment of the present invention, and referring to fig. 1, the driving method of the display panel includes:
for example, in the existing display panel, the display gray scale corresponding to the minimum brightness that can be displayed by each light emitting device is usually 0 gray scale, the display gray scale corresponding to the maximum brightness that can be displayed by each light emitting device is usually 255 gray scale, and then the maximum gray stage displayed by the display panel is 0 gray scale to 255 gray scale. When dividing the gray stage, the maximum gray stage can be divided according to the requirement of uniformity in different gray scale ranges, for example, when the requirement of uniformity on the display gray scale in the low gray scale range (which can mean 0 gray scale to 32 gray scale) is higher, the display gray scale in the low gray scale range can be divided into more gray stages.
fig. 2 is a schematic structural diagram of a pixel circuit commonly used in the prior art, and referring to fig. 2, the pixel circuit includes a first transistor T1, a second transistor T2, a third transistor T3, a fourth transistor T4, a fifth transistor T5, a sixth transistor T6, a seventh transistor T7, a storage capacitor Cst, and an organic light emitting device D1, and further includes a first power supply voltage input terminal Vdd and a second power supply voltage input terminal Vss, among them, the second transistor T2 is a driving transistor, the conductive states of the first transistor T1 and the sixth transistor T6 are controlled by the Scan signal inputted from the second Scan signal input terminal Scan2, the conductive state of the seventh transistor T7 is controlled by the Scan signal inputted from the first Scan signal input terminal Scan1, the conductive state of the fifth transistor T5 is controlled by the Scan signal inputted from the third Scan signal input terminal Scan3, and the conductive states of the third transistor T3 and the fourth transistor T4 are controlled by the signal inputted from the light emission control signal input terminal. Wherein the operation process of the pixel circuit can comprise an initialization phase, a data writing phase and a light emitting phase. In the initialization stage, the initialization voltage inputted from the reference signal input terminal Vref is transmitted to the gate of the second transistor T2 through the seventh transistor T7; in the data writing phase, the data voltage inputted from the data signal input terminal Vdata is transmitted to the gate of the second transistor T2 through the first transistor T1, the second transistor T2, and the sixth transistor T6. In the data writing stage, the data voltage input by the data signal input terminal Vdata is the data signal in this embodiment.
Specifically, the display gray scale of the light emitting device in the display panel corresponds to the data voltage written to the gate of the driving transistor in the pixel circuit that drives the light emitting device. The data voltage may be generated and output by the driving chip, the display panel may include data lines, and the data voltage output by the driving chip may be transmitted to a data voltage input terminal in the pixel circuit through an output line. When the display panel displays, the data voltage can be provided to the grid electrode of the driving transistor according to the display gray scale of the luminescent device driven by the pixel circuit in the gray scale section, so that the luminescent brightness of the luminescent device corresponds to the display gray scale.
in the working process of the pixel circuit shown in fig. 2, the initialization voltage input at the initialization stage initialization voltage input terminal is the reference signal in this embodiment. As described in the background art, in the prior art, when the initialization voltage is a fixed value, the uniformity of the display panel is inconsistent at different gray scales. In this step, the reference signal output to the display panel and corresponding to a single gray phase may be dynamically adjusted. Specifically, the reference signal output to the display panel corresponding to each gray level can be dynamically adjusted, and the uniform brightness value of the display panel in the gray level segment can be obtained by adjusting the reference signal each time.
For example, when the maximum gray level is 0 gray level to 255 gray level, and the maximum gray level is divided into four gray levels, i.e., 0-63 gray level, 64 gray level to 127 gray level, 128 gray level to 191 gray level, and 192 gray level to 255 gray level, the reference signal is dynamically adjusted in each of the four gray levels. For example, when dynamically adjusting the reference signal corresponding to the gray scale segment of 0-63 gray scale, an initialization voltage can be written into the gate of the driving transistor in the initialization stage of all the pixel circuits in the display panel; writing data voltage into the grid electrodes of the driving transistors of all the pixel circuits in a data writing stage, wherein the data voltage is the data voltage corresponding to a certain gray scale in a gray scale section corresponding to 0-63 gray scales; in the light emitting stage, a brightness uniformity of the light emitting devices in the display panel at the gray scale is obtained, wherein the brightness uniformity may be a ratio of the light emitting device with the minimum brightness to the light emitting device with the maximum brightness in the display panel. The above is a process of acquiring a uniform value of luminance once, the above process is performed once every time a reference signal (initialization voltage) is adjusted, and when the reference signal is adjusted in the same gray phase and a uniform value of luminance is acquired, a data voltage written to the gate electrode of the driving transistor is not changed every time a data writing phase in the above process is performed. When the reference signal is adjusted for multiple times and the brightness uniformity value is obtained, the reference signal corresponding to the maximum brightness uniformity value of the brightness uniformity values can be finally obtained, and the reference signal corresponding to the maximum brightness uniformity value can be used as the reference signal corresponding to the gray scale segment.
The process of dynamically adjusting the reference signal for other gray scale segments can refer to the process of dynamically adjusting the signal for the gray scale segments of 0-63 gray scales and acquiring a uniform brightness value, and finally the corresponding relation between each gray scale segment and the reference signal can be formed.
And 140, driving the display panel to display in the corresponding gray scale section according to the reference signal corresponding to the maximum brightness uniform value.
Specifically, after the step 130 is performed, each gray scale segment, that is, the reference signal corresponding to the maximum uniformity in each gray scale segment, can be formed, and when performing display, the display panel can be driven to perform display in the corresponding gray scale segment according to the reference signal corresponding to the maximum brightness uniformity. For example, for a certain specific gray scale, the gray scale segment to which the specific gray scale belongs can be determined, and the reference signal of the maximum uniform brightness value corresponding to the gray scale segment can be determined according to the gray scale segment to which the specific gray scale belongs, so that the uniform brightness value can be larger when each gray scale segment is displayed, the difference between the uniform brightness values of different gray scales can be reduced, and the display effect can be improved. In particular, the display panel has a large brightnessIf the data voltage is uniform, it indicates that the data voltage can be written into the gate of the driving transistor more sufficiently, and it indicates that the charging rate of the driving transistor in the pixel circuit is greater in the gray phase, wherein the charging rate can be calculated by the following formula
Wherein η represents the charging rate, VrefDenotes a reference signal, Vdata0Representing the actual data voltage, V, written to the gate of the drive transistor after the data writing phasedata1Representing the target data voltage that needs to be written during the data write phase. That is, the driving method of the display panel in this embodiment can make the pixel circuit in the display panel have a higher charging rate in each gray scale section by dynamically adjusting the reference signal, thereby improving the display uniformity of the display panel under different gray scales.
It should be noted that, the above description is only made by taking the driving method as an example for driving a display panel including a 7T1C pixel circuit (i.e., the pixel circuit shown in fig. 2) commonly used in the prior art, the driving method provided by this embodiment may also be applied to other display panels in the prior art, and the display panel includes a pixel circuit including a transistor for initializing a driving transistor, and the embodiment of the present invention is not limited specifically here.
In the driving method of the display panel according to the embodiment of the present invention, the maximum gray scale section displayed by the display panel is divided into a plurality of gray stages, the reference signal output to the display panel and corresponding to a single gray stage is adjusted to obtain a plurality of uniform brightness values corresponding to the gray stage, and the reference signal corresponding to the maximum uniform brightness value among the plurality of uniform brightness values is obtained; the display panel is driven to display in the corresponding gray scale section according to the reference signal corresponding to the maximum uniform brightness value, so that the charging rate of the pixel circuit is higher and the uniform brightness value is higher when each gray scale section displays, the difference of the uniform brightness values of different gray scales is further reduced, the display uniformity of the display panel under different gray scales is further improved, and the display effect is improved.
Fig. 3 is a flowchart of another driving method of a display panel according to an embodiment of the present invention, and referring to fig. 3, the driving method of the display panel includes:
wherein m > n;
Specifically, the lowest GRAY level GRAY in the maximum GRAY stage of the existing GRAY stage1Usually, the GRAY level is 0, and the total number of GRAY levels that can be displayed on the display panel is determined by the number of bits of the display panel, for example, for an 8-bit display panel, the total number of GRAY levels is 28 to 256, and the highest GRAY level GRAY in the maximum GRAY level stage2Is odd, e.g. GRAY, highest GRAY level in maximum GRAY stage for 8-bit display panel2At 255 gray levels, the first intermediate gray level obtained by the above formula is an integer. In the lower gray scale range, the influence of the variation of the driving current of the driving transistor on the display gray scale is more obvious than that in the higher gray scale range, and the driving current is related to the data voltage written into the grid electrode of the driving transistor. Therefore, the number of gray scale segments divided from the lowest gray scale to the first intermediate gray scale in the maximum gray stage is set to be larger than the number of gray scale segments divided from the first intermediate gray scale to the highest gray scale in the maximum gray stage displayed by the display panel, namely, the number of gray scale segments divided from the lowest gray scale to the first intermediate gray scale in the maximum gray stage is set to be denser, so that the number of gray scales included in the gray stage corresponding to one reference signal in a lower gray scale range (from the lowest gray scale to the first intermediate gray scale in the maximum gray stage) is smaller, the reference signal corresponding to the gray scale segments can further meet the requirement of each gray scale on the reference signal in the gray stage, and the light-emitting device can display one gray scaleWhen each gray scale in the segment is in use, the data voltage can be written in sufficiently, so that the display uniformity of the range of lower gray scales can be improved, and the display effect can be improved.
fig. 4 is a flowchart of another driving method of a display panel according to an embodiment of the present invention, and referring to fig. 4, the driving method of the display panel includes:
331, selecting any gray scale in a single gray stage, and measuring a first brightness uniform value of the display panel under an original reference signal; the original reference signal is a preset fixed reference voltage;
specifically, in the conventional driving method, the initialization voltage (reference signal) is usually a constant value, and the original reference signal may be the initialization voltage value in the conventional driving method. In this step, the original reference signal may be written into the gate of the driving transistor at the initialization stage of each pixel circuit of the display panel; in the data writing stage, writing the data voltage corresponding to any gray scale in the single gray stage into the grid electrode of the driving transistor; and measuring a brightness uniformity value of the display panel at the light emitting stage as a first brightness uniformity value.
specifically, when the reference signal is adjusted, the reference signal may be adjusted in one direction, for example, when the driving transistor is a P-type transistor, the reference signal may be gradually increased from a value smaller than the data voltage corresponding to the selected gray scale to the data voltage corresponding to the selected gray scale, and the luminance uniformity value may be measured once as the second luminance uniformity value in the light emitting stage of each pixel circuit every time the reference signal is adjusted. Specifically, the reference signal is adjusted along one direction, so that the adjustment of the reference signal is easier to present a certain regularity, and correspondingly, the change of the brightness uniformity value is also easier to present a certain regularity, thereby being more convenient for setting the adjustment program.
Specifically, in this step, the first luminance uniform value and the plurality of second luminance uniform values may be compared to finally obtain a maximum value of the first luminance uniform value and the plurality of second luminance uniform values.
And 340, driving the display panel to display in the corresponding gray scale section according to the reference signal corresponding to the maximum brightness uniform value. This step is the same as step 140 in the above embodiment, and will not be described again here.
Fig. 5 is a flowchart of another driving method of a display panel according to an embodiment of the present invention, and referring to fig. 5, the driving method of the display panel includes:
431, selecting any gray scale in the gray stage, and measuring a first brightness uniform value of the display panel under an original reference signal; the original reference signal is a preset fixed reference voltage; this step is the same as the step 331 in the above embodiment, and is not described herein again;
specifically, when the reference signal is adjusted, the reference signal may be adjusted in one direction, for example, when the driving transistor is a P-type transistor, the reference signal may be gradually decreased from the data voltage corresponding to the selected gray scale, and the luminance uniformity value may be measured once at the light emitting stage of each pixel circuit as the second luminance uniformity value every time the reference signal is adjusted. Specifically, the reference signal is adjusted in one direction, so that the adjustment of the reference signal is easier to present a certain regularity, for example, when the driving transistor is a P-type transistor, the reference signal can be gradually increased from a certain value smaller than the data voltage corresponding to the selected gray scale to the data voltage corresponding to the selected gray scale, thereby facilitating the setting of the adjustment program.
And 433, acquiring a maximum brightness uniformity value of the first brightness uniformity value and the plurality of second brightness uniformity values. This step is the same as step 333 in the above embodiment, and is not described herein again;
On the basis of the technical scheme, selecting any gray scale in the gray stage comprises the following steps:
selecting a second intermediate gray scale in a single gray stage; wherein the second intermediate gray level represents an average gray level of the minimum gray level in the gray phase and the maximum gray level in the gray level segment.
Specifically, when the sum of the maximum gray scale and the minimum gray scale in the gray scale section is an even number, the second intermediate gray scale is half of the sum of the maximum gray scale and the minimum gray scale in the gray scale section; when the sum of the maximum gray scale and the minimum gray scale in the gray stage is an odd number, the second intermediate gray scale is the sum of the maximum gray scale and the minimum gray scale in the gray stage plus 0.5 or minus 0.5. Specifically, the second intermediate gray scale in a single gray stage is selected, and the brightness uniformity of the display panel under the second intermediate gray scale is measured after the reference signal is adjusted each time, so that the reference signal corresponding to the maximum brightness uniformity can be finally obtained, and the display panel can have larger brightness uniformity under the second intermediate gray scale. In addition, because the closer the reference signal is to the data voltage corresponding to the gray scale, the higher the charging rate of the pixel circuit at the gray scale, and the data voltage generally increases with the increase of the gray scale or decreases with the increase of the gray scale in one gray stage, i.e. monotonically changes, when the reference signal monotonically changes and is in accordance with the monotonically changing direction of the data voltage, the charging rate of the display panel at each gray scale can be higher, and the display panel has greater brightness uniformity at different gray scales. However, in consideration of hardware limitations and the cycle in which the driving method is performed, it is general to set a gray scale section to include a plurality of gray scales. Because the difference value between the second intermediate gray scale and the minimum gray scale in the gray scale section and the difference value between the second intermediate gray scale and the maximum gray scale in the gray scale section are approximately consistent, correspondingly, the reference signal corresponding to the maximum brightness uniformity of the second intermediate gray scale is used as the reference signal corresponding to the whole gray scale section, so that the reference signal is closer to the reference signal corresponding to other gray scales in the gray scale section and having the maximum charging rate, the display uniformity of the whole display panel is higher in a single gray scale stage, and the display effect is improved.
On the basis of the above technical solution, optionally, each gray scale segment includes a plurality of gray scales.
Specifically, the reference signal needs to be adjusted in each gray stage, so that the more the number of gray scale segments obtained by dividing the maximum gray stage, the more the number of times the reference signal needs to be adjusted. Each gray scale section comprises a plurality of gray scales, so that the plurality of gray scales correspond to one reference signal, the adjustment times of the reference signal can be reduced, and the execution period of the driving method of the display panel can be shortened. Moreover, the plurality of gray scales correspond to one reference signal, so that the total number of the reference signals required by the pixel circuits in the display panel is less, and the circuit for generating the reference signals is easier to realize on hardware.
Optionally, each gray level segment includes a gray level.
Specifically, each gray scale section comprises a gray scale, each gray scale corresponds to a reference signal, the charging rate of the pixel circuit can be higher under each gray scale, the brightness uniformity value under each gray scale is larger, the brightness uniformity difference under different gray scales is further reduced, and the display effect is improved.
Optionally, the data signal is a data voltage; the minimum data voltage corresponding to the gray scale in the first gray stage is greater than the maximum data voltage corresponding to the gray scale in the second gray stage; the first reference signal corresponding to the first gray scale section is greater than the second reference signal corresponding to the second gray scale section; the first ash stage and the second ash stage are two ash stages within the maximum ash stage.
Specifically, the closer the reference signal and the data voltage are, the higher the charging rate is in the data writing stage, and the better the uniformity of the display panel is. Illustratively, the maximum gray stage is 0 gray scale to 255 gray scale, the first gray stage is 0 gray scale to 31 gray scale, the minimum data voltage in the gray stage corresponding to 31 gray scale in the first gray stage is 2V, the second gray stage is 64 gray scale to 95 gray scale, the maximum data voltage corresponding to 64 gray scale in the second gray stage is 1.8V, that is, the minimum data voltage corresponding to the gray scale in the first gray stage is greater than the maximum data voltage corresponding to the gray scale in the second gray stage, the reference signal (e.g. 1.8V) corresponding to the first gray scale is greater than the reference signal (e.g. 1.5V) corresponding to the second gray stage, thereby ensuring that the pixel circuit can reach a greater charging rate in each gray stage, thereby making the luminance uniformity value in each gray stage greater, further reducing the gray scale difference of the luminance uniformity values under different gray scales, and further improving the display uniformity, the display effect is improved.
Fig. 6 is a schematic structural diagram of a driving apparatus for a display panel according to an embodiment of the present invention, and referring to fig. 6, the driving apparatus 500 for a display panel includes:
a gray scale dividing module 510, configured to divide a maximum gray scale segment displayed by the display panel into a plurality of gray scale segments;
the data driving module 520 is configured to output a corresponding data signal to the display panel according to the gray stage to drive the display panel to display in the corresponding gray scale stage;
a reference obtaining module 530, configured to adjust a reference signal output to the display panel and corresponding to a single gray stage to obtain a plurality of uniform brightness values corresponding to the gray stage, and obtain a reference signal corresponding to a maximum uniform brightness value of the plurality of uniform brightness values;
the reference driving module 540 is configured to drive the display panel to display in the corresponding gray scale section according to the reference signal corresponding to the maximum brightness uniformity value.
In the driving apparatus for a display panel according to the embodiment of the present invention, a maximum gray scale section displayed by the display panel is divided into a plurality of gray stages by a gray scale dividing module, a reference signal output to the display panel and corresponding to a single gray stage is adjusted to obtain a plurality of uniform brightness values corresponding to the gray stage, and a reference obtaining module obtains a reference signal corresponding to a maximum uniform brightness value among the plurality of uniform brightness values; the reference driving module drives the display panel to display in the corresponding gray scale section according to the reference signal corresponding to the maximum uniform brightness value, so that the charging rate of the pixel circuit is higher and the uniform brightness value is larger when each gray scale section displays, the difference of the uniform brightness values of different gray scales is further reduced, the display uniformity of the display panel under different gray scales is further improved, and the display effect is improved.
Fig. 7 is a schematic structural diagram of a display device according to an embodiment of the present invention, and referring to fig. 7, the display device includes a display panel 100 and a driving device 500 of the display panel according to the embodiment, the display panel 100 is electrically connected to the driving device 500, the driving device 500 outputs a data signal and a reference signal to the display panel 100, and the display panel 100 drives a light emitting device in the display panel 100 to emit light according to the received data signal and reference signal.
Referring to fig. 7, the display panel includes a plurality of pixel circuits 101, a plurality of data signal lines (D1, D2, D3, D4 … …), a plurality of reference signal lines (R1, R2, R3, R4 … …), optionally, each data line may be connected to a data voltage input terminal of a column of pixel circuits, and each initialization line may be connected to a reference signal input terminal of a column of pixel circuits.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (10)
1. A method of driving a display panel, comprising:
dividing the maximum gray scale section displayed by the display panel into a plurality of gray stages;
outputting corresponding data signals to the display panel according to each gray scale in the gray stage so as to drive the display panel to display in the corresponding gray stage;
adjusting a reference signal which is output to the display panel and corresponds to a single gray stage to obtain a plurality of uniform brightness values corresponding to the gray stage, and obtaining the reference signal corresponding to the maximum uniform brightness value of the plurality of uniform brightness values;
and driving the display panel to display at the corresponding gray stage according to the reference signal corresponding to the maximum brightness uniform value.
2. The method according to claim 1, wherein the dividing the maximum gray scale segment displayed by the display panel into a plurality of gray scale segments comprises:
dividing the lowest gray scale to the first intermediate gray scale in the maximum gray stage into m gray scale sections, and dividing the highest gray scale in the first intermediate gray scale to the maximum gray stage into n gray stages;
wherein m > n;
3. The method according to claim 1, wherein the adjusting the reference signal output to the display panel and corresponding to a single gray stage to obtain a plurality of uniform brightness values corresponding to the gray stage and obtain the reference signal corresponding to a maximum uniform brightness value of the plurality of uniform brightness values comprises:
selecting any gray scale in the single gray stage, and measuring a first brightness uniform value of the display panel under an original reference signal; the original reference signal is a preset fixed reference voltage;
adjusting the reference signal to gradually increase or decrease the reference signal to a data voltage corresponding to the selected gray scale, and determining a second uniform brightness value of the display panel at the selected gray scale to obtain a plurality of second uniform brightness values under each reference signal;
acquiring the maximum brightness uniformity value of the first brightness uniformity value and the plurality of second brightness uniformity values.
4. The method according to claim 1, wherein the adjusting the reference signal output to the display panel and corresponding to a single gray stage to obtain a plurality of uniform brightness values corresponding to the gray stage and obtain the reference signal corresponding to a maximum uniform brightness value of the plurality of uniform brightness values comprises:
selecting any gray scale in the gray stage, and measuring a first brightness uniform value of the display panel under an original reference signal; the original reference signal is a preset fixed reference voltage;
adjusting the reference signal to enable the data voltage corresponding to the selected gray scale of the reference signal to gradually increase or decrease, and determining a second brightness uniformity value of the display panel under the selected gray scale under each reference signal to obtain a plurality of second brightness uniformity values;
acquiring the maximum brightness uniformity value of the first brightness uniformity value and the plurality of second brightness uniformity values.
5. The method according to claim 3 or 4, wherein selecting any gray level in the gray phase comprises:
selecting a second intermediate gray scale in a single gray stage; wherein the second intermediate gray level represents an average gray level of a minimum gray level within the gray phase and a maximum gray level within the gray phase.
6. The method according to claim 1, wherein each of the gray scale segments comprises a plurality of gray scales.
7. The method according to claim 1, wherein each gray level segment includes a gray level.
8. The method for driving a display panel according to claim 1, wherein the data signal is a data voltage; the minimum data voltage corresponding to the gray scale in the first gray stage is greater than the maximum data voltage corresponding to the gray scale in the second gray stage; a first reference signal corresponding to the first gray scale section is greater than a second reference signal corresponding to the second gray scale section; the first ash stage and the second ash stage are two ash stages within the maximum ash stage.
9. A driving apparatus of a display panel, comprising:
the gray scale dividing module is used for dividing the maximum gray scale section displayed by the display panel into a plurality of gray stages;
the data driving module is used for outputting corresponding data signals to the display panel according to each gray scale in the gray stage so as to drive the display panel to display in the corresponding gray stage;
a reference obtaining module, configured to adjust a reference signal output to the display panel and corresponding to a single gray stage to obtain a plurality of uniform brightness values corresponding to the gray stage, and obtain the reference signal corresponding to a maximum uniform brightness value of the plurality of uniform brightness values;
and the reference driving module is used for driving the display panel to display at the corresponding gray stage according to the reference signal corresponding to the maximum brightness uniform value.
10. A display apparatus comprising a display panel and a driving apparatus of the display panel according to claim 9, the display panel being electrically connected to the driving apparatus, the driving apparatus outputting the data signal and the reference signal to the display panel, the display panel driving light emitting devices in the display panel to emit light in accordance with the reception of the data signal and the reference signal.
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