CN116072070B - Display panel, driving method thereof and display device - Google Patents
Display panel, driving method thereof and display device Download PDFInfo
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Classifications
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—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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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
- G09G3/3225—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
- G09G3/3233—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix with pixel circuitry controlling the current through the light-emitting element
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
- G09G3/3275—Details of drivers for data electrodes
- G09G3/3291—Details of drivers for data electrodes in which the data driver supplies a variable data voltage for setting the current through, or the voltage across, the light-emitting elements
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0233—Improving the luminance or brightness uniformity across the screen
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0257—Reduction of after-image effects
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
- Electroluminescent Light Sources (AREA)
- Liquid Crystal Display Device Control (AREA)
Abstract
The invention discloses a display panel, a driving method thereof and a display device, wherein the display panel comprises: a display area and a non-display area; the non-display area comprises a first non-display area which is positioned on a first side of the display area in a first direction; the first non-display area includes a plurality of data terminals; the display panel includes a plurality of data lines extending in a first direction; the data line comprises a first end close to the first non-display area and a second end far away from the first non-display area; the first end of the data line is connected with the corresponding data terminal; the display panel comprises a data detection circuit and a driving chip; the data detection circuit is respectively connected with the data line and is used for acquiring the actual measurement current of the data line; the driving chip is respectively and electrically connected with the data terminal and the data detection circuit, and is used for acquiring compensation voltage according to the actual measurement current of the data line, and superposing the compensation voltage to the theoretical data voltage and outputting the theoretical data voltage to the corresponding data terminal. The technical scheme provided by the invention can improve the display uniformity of the display panel.
Description
Technical Field
The present invention relates to the field of display technologies, and in particular, to a display panel, a driving method thereof, and a display device.
Background
Along with the continuous development of display technology, the application range of the display panel is wider and wider, and the requirements of people on the display panel are also higher and higher. Therefore, how to manufacture a high quality display panel is a technical problem to be solved by those skilled in the art.
In display panels, especially those in which pixels are driven by current such as OLED, problems such as luminance degradation, display unevenness, and image sticking, etc. are caused in actual flow through the display panel due to line voltage drop (RC Loading) and device process parameters.
Disclosure of Invention
The embodiment of the invention provides a display panel, a driving method thereof and a display device, so as to improve the display uniformity of the display panel.
In a first aspect, an embodiment of the present invention provides a display panel, including: a display area and a non-display area; the non-display area comprises a first non-display area which is positioned on the first side of the display area in the first direction; the first non-display area includes a plurality of data terminals;
The display panel includes a plurality of data lines extending in the first direction; the data line comprises a first end close to the first non-display area and a second end far away from the first non-display area; the first end of the data line is connected with the corresponding data terminal;
The display panel comprises a data detection circuit and a driving chip; the data detection circuit is respectively connected with the data line and is used for acquiring the actual measurement current of the data line; the driving chip is respectively and electrically connected with the data terminal and the data detection circuit, and is used for acquiring compensation voltage according to the actual measurement current of the data line, and superposing the compensation voltage to theoretical data voltage and outputting the theoretical data voltage to the corresponding data terminal.
In a second aspect, an embodiment of the present invention provides a driving method of a display panel, the display panel including a display area and a non-display area; the non-display area comprises a first non-display area which is positioned on the first side of the display area in the first direction; the first non-display area includes a plurality of data terminals; the display panel includes a plurality of data lines extending in the first direction; the data line comprises a first end close to the first non-display area and a second end far away from the first non-display area; the first end of the data line is connected with the corresponding data terminal; the display panel comprises a data detection circuit and a driving chip; the data detection circuit is respectively connected with each data line; the driving chip is connected with each data terminal;
The driving method includes:
In the test stage, controlling the data detection circuit to acquire the actual measurement current of the data line; controlling the driving chip to acquire compensation voltage according to the actually measured current;
And in the display stage, controlling the driving chip to superimpose the compensation voltage on the theoretical data voltage and outputting the theoretical data voltage to the corresponding data terminal.
In a third aspect, an embodiment of the present invention further provides a display apparatus, including a display panel provided by any embodiment of the present invention.
In the invention, a data detection circuit is arranged, the data detection circuit can acquire actual measurement current on a data line in the process of scanning and displaying the display panel, so as to acquire actual measurement current of a pixel, a driving chip can store theoretical data voltage required by the pixel, and then the driving chip acquires compensation voltage according to the actual measurement current and the theoretical data voltage output by the data detection circuit, so that the compensation voltage is overlapped with the theoretical data voltage to be output to a data terminal in the normal displaying process of the display panel, and is transmitted to a data line connected with the pixel through the data terminal, thus completing compensation of the pixel, and the like, and the compensation of any pixel of the display panel can be completed. According to the embodiment, the actual measurement current flowing through the pixels is measured, the final data voltage is compensated, the problems of display brightness attenuation, display unevenness and residual shadows caused by the voltage drop on the data line and the technological parameters of the light-emitting device are avoided, and the display uniformity is improved.
Drawings
Fig. 1 is a schematic structural diagram of a display panel according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of another display panel according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of another display panel according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of another display panel according to an embodiment of the present invention;
Fig. 5 is a schematic structural diagram of another display panel according to an embodiment of the present invention;
Fig. 6 is a schematic structural diagram of another display panel according to an embodiment of the present invention;
Fig. 7 is a schematic flow chart of a driving method of a display panel according to an embodiment of the present invention;
fig. 8 is a schematic structural diagram of a display device according to an embodiment of the present invention.
Detailed Description
The invention is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present invention are shown in the drawings.
In the prior art, the actual brightness of the pixel display is larger than the ideal brightness of the OLED product due to the driving and design characteristics, which is easy to cause uneven display of the whole surface. Specifically, firstly, because RC loading exists in the wiring, the driving chip IC outputs data voltage to the pixels so as to be easy to attenuate; secondly, because of the process difference of the OLED devices, the actual voltage drop loading of each pixel is different, so that the display current of the OLED devices is different under the same data voltage driving. These causes cause a difference between the actual display luminance of the pixel and the ideal luminance, resulting in uneven display of the whole surface.
In order to solve the above problems, an embodiment of the present invention provides a display panel, including: a display area and a non-display area; the non-display area comprises a first non-display area which is positioned on a first side of the display area in a first direction; the first non-display area includes a plurality of data terminals;
the display panel includes a plurality of data lines extending in a first direction; the data line comprises a first end close to the first non-display area and a second end far away from the first non-display area; the first end of the data line is connected with the corresponding data terminal;
The display panel comprises a data detection circuit and a driving chip; the data detection circuit is respectively connected with the data line and is used for acquiring the actual measurement current of the data line; the driving chip is respectively and electrically connected with the data terminal and the data detection circuit, and is used for acquiring compensation voltage according to the actual measurement current of the data line, and superposing the compensation voltage to the theoretical data voltage and outputting the theoretical data voltage to the corresponding data terminal.
In the embodiment of the invention, the data detection circuit is arranged, the data detection circuit can acquire the actual measurement current on the data line in the scanning display process of the display panel, so as to acquire the actual measurement current of the pixel, the driving chip can store the theoretical data voltage required by the pixel, and the driving chip acquires the compensation voltage according to the actual measurement current and the theoretical data voltage output by the data detection circuit, so that the compensation voltage is overlapped with the theoretical data voltage to be output to the data terminal in the normal display process of the display panel, and is transmitted to the data line connected with the pixel through the data terminal, thereby completing the compensation of the pixel, and the like, and the compensation of any pixel of the display panel can be completed. According to the embodiment, the actual measurement current flowing through the pixels is measured, the final data voltage is compensated, the problems of display brightness attenuation, display unevenness and residual shadows caused by the voltage drop on the data line and the technological parameters of the light-emitting device are avoided, and the display uniformity is improved.
The foregoing is the core idea of the present invention, and the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without making any inventive effort are intended to fall within the scope of the present invention.
As shown in fig. 1, fig. 1 is a schematic structural diagram of a display panel according to an embodiment of the present invention, where the display panel includes a display area AA and a non-display area NA, at least a portion of the non-display area NA is disposed around the display area AA, and the non-display area NA includes a first non-display area NA1 located on a first side of the display area AA in a first direction Y. The first non-display area NA1 includes a plurality of data terminals 11. The data terminals 11 may be pad structures for overlapping the driving chips 12, as shown in fig. 1, the display panel is further provided with the driving chips 12, the driving chips 12 may output data voltages to the data lines 12, and the driving chips 12 may be bound to the display panel through a Chip On Glass (COG) process, so that the driving chips 12 are directly connected to the data lines 13 through leads of the display panel. Of course, the data terminal 11 may not be directly overlapped with the driving Chip 12, referring to fig. 2, fig. 2 is a schematic structural diagram of another display panel provided in the embodiment of the present invention, the driving Chip 12 may use a Chip On Flex (COF) process, specifically, a die pad packaging technology for fixing the driving Chip 12 On the flexible circuit board 21, so that the driving Chip 12 is connected with the data line 13 of the display panel through the flexible circuit board 21, which is beneficial to the design of a narrow frame of the display panel. Whether in COG or COF, the driving chip 12 can output data voltages to the respective data lines 13 through the data terminals 11.
The data line 13 of the display panel may extend in the first direction Y, and the data line 13 includes two ends: a first end and a second end; the first end is close to the first non-display area NA1, also called the near end, the near end is the one end nearer to the driving chip 12, the second end is far away from the first non-display area NA1, also called the far end, the far end is the one end farther from the driving chip 12, when the data voltage is output to each data line 13 by the driving chip 12, the data voltage is transmitted from the first end to the second end along with the data voltage, and the data voltage is attenuated due to the voltage drop of the data line 13, so that the current input to the pixel is finally attenuated, the expected brightness cannot be displayed, and even the problems of uneven display, ghost and the like occur. The pixel 15 generally includes a pixel driving circuit and a light emitting unit, and the data line 13 inputs a data voltage into the pixel driving circuit of the pixel 15, so that the pixel driving circuit generates a driving current for driving the light emitting unit to emit light, and the light emitting element may be an OLED device or the like.
The display panel may further include a data detection circuit 14, where the data detection circuit 14 is connected to each data line 13, so as to obtain a current value on the data line 13, which may be referred to as a measured current of the data line 13 or a measured current of the currently-lit pixel 15. The data detection circuit 14 may also be coupled to the driver chip 12 for transmitting the measured current to the driver chip 12. In this embodiment, the theoretical current generated between the driving chip 12 and the pixel may be obtained through simulation or experiment, so as to compare the theoretical current with the actual measurement current, and it should be noted that the difference between the theoretical current and the actual measurement current may be caused by the voltage drop of the data line or may be caused by the process parameter difference of different light emitting elements, and when compensating the currently lit pixel 15, the embodiment may obtain the actual measurement data voltage according to the current calculation formula, where I OLED is the current flowing through the light emitting unit, K is a constant, V data is the data voltage, and it is known that there is a fixed calculation relationship between the actual measurement current and the actual measurement data voltage. Similarly, there is a fixed relationship between the theoretical current and the theoretical data voltage, in this embodiment, the actual data voltage is obtained through the actual measurement current, the theoretical data voltage is obtained through the theoretical current, the theoretical data voltage and the actual data voltage are compared, the compensation voltage is obtained, the compensation voltage is added to the theoretical data voltage, and the compensated data voltage is output to the corresponding data line 13, so that the display precision of the pixel 15 is improved, the uniformity of the whole display panel is improved, and the problems of brightness attenuation and uneven display caused by the voltage drop of the data line are avoided. In addition, since the parameters of the light emitting units are different, loading differences among the light emitting elements are easily caused, the data voltage of the pixels is compensated according to the actually measured current, and the problems of uneven display, ghost and the like of the display panel are solved from the source. It should be noted that, in this embodiment, the driving current transmitted on the data lines 13 is directly detected, so that the driving current can be obtained regardless of whether the data detection circuit 14 is connected to each data line 13, as shown in fig. 2, the distal end of the data line 13 may be connected, as shown in fig. 1, or the distal end of the data line 13 may not be connected. Compared with the scheme of directly measuring the voltage drop of the far end and the near end of the data line 13, the method has various connection modes, and the driving current flowing through the pixels is directly and accurately measured, so that the voltage caused by the technological parameter reasons of the light-emitting units can be accurately compensated, the compensation accuracy of the light-emitting brightness of the pixels is enhanced, and the picture uniformity is improved.
Alternatively, the driving chip 12 may include: a compensation calculation module; the compensation calculation module is used for obtaining theoretical data voltage output to the data line by the driving chip according to the theoretical current of the data line obtained through simulation; the compensation calculation module is connected with the data detection circuit and is used for acquiring actual measurement data voltage according to the actual measurement current of the data line; the compensation calculation module is also used for taking the difference value of the theoretical data voltage and the actual data voltage as the compensation voltage of the data line.
From the current calculation formula I OLED＝K(PVDD-Vdata)2, it can be known that The embodiment can be based on the actual measured currentThe measured data voltage V Actual measurement is obtained, and the compensation calculation module can obtain the measured data voltage according to the theoretical current I Theory of of the data line obtained by simulation and according to the theoretical current I Theory of The measured data voltage V Theory of is obtained, and the compensation calculation module calculates the compensation voltageAnd then the compensation voltage is used as the compensation voltage of the pixel currently driven by the data line, and in the picture display process, if the current pixel is driven again, the theoretical data voltage is overlapped with the compensation voltage and is used as the final data voltage to be output from the driving chip to the corresponding data line.
The above-mentioned compensation voltage calculating process is a compensation voltage calculating process of one pixel in the display panel, and this embodiment can calculate the compensation voltage of any one pixel in all the pixels on the display panel, so as to improve the measurement accuracy of the corresponding pixel. Alternatively, as shown in fig. 2, the display area AA may include a plurality of pixels 15; the driving chip 12 is used for obtaining the compensation voltage of each pixel 15 according to the actual measurement current of the data line 13 connected with each pixel 15. Therefore, the embodiment can obtain the compensation voltage of each pixel 15 on the display panel, and in the subsequent picture display process, the corresponding compensation voltage and the theoretical data voltage are superimposed on each pixel 15 to enhance the light-emitting brightness accuracy of each pixel 15, further improve the uniformity of the whole display panel, effectively prevent the voltage drop of the data line and the voltage drop of the light-emitting unit, and greatly improve the display uniformity of the display panel.
In addition, it should be noted that, during the display process of the display panel, a certain pixel may display different gray scales in different pictures, and the theoretical current and the actually measured current of different gray scales are different, that is, the compensation voltage of the same pixel under different gray scale brightness may be different. Of course, for pixels with different gray scale brightness, the selected compensation voltages can be the same voltage value, specifically, in the test stage, one compensation voltage with a specific gray scale brightness is selected as the compensation voltage with all gray scale brightness of the pixel, thus, the compensation voltage can be obtained only by one test, the pixel brightness is effectively compensated, the test complexity is saved, and the display uniformity can be improved. Of course, if the display uniformity is further improved, the compensation voltage can be calculated for each gray level of the current pixel, and the gray level of the pixel and the corresponding compensation voltage are formed into a database table, when the display screen of the current frame is a certain gray level, the corresponding compensation voltage is selected from the database table to be overlapped with the theoretical data voltage under the gray level, and the pixel is driven to emit light, so that the light-emitting brightness of the pixel is more accurate, and the display effect of the screen is better.
In the above embodiment, the compensation voltage is calculated for each pixel on the display panel, when the area of the display panel is larger, the calculated amount is larger, on this basis, the display area AA of the whole display panel can be partitioned, and the method that the compensation voltage of each partition has the same value is adopted, so that the calculated amount of the compensation voltage is reduced in the test process, and the problems of panel brightness attenuation and uneven display can be effectively solved, alternatively, as shown in fig. 3, fig. 3 is a schematic structural diagram of another display panel provided in the embodiment of the present invention, and the display area AA may include a plurality of compensation areas Z (for example, Z1 to Zn) along the first direction Y; each compensation zone Z comprises a plurality of pixels 15; the compensation voltages corresponding to the compensation regions Z sequentially increase in a direction from the first end of the data line 13 toward the second end of the data line 13. Referring to fig. 3, the display area AA may be divided into a plurality of compensation areas a along the first direction Y, for example, the compensation areas Z1 and Z2 are sequentially included in a direction from the first end to the second end of the data line, to the compensation areas Zn-1 and Zn total n compensation areas. In this embodiment, the compensation voltages of the pixels 15 in each compensation zone Z are set to be the same, so that compensation control is conveniently implemented, and in the direction from the first end to the second end of the data line along the first direction Y, the compensation voltages corresponding to the compensation zones Z are sequentially increased, for example, the compensation voltage of the compensation zone Z2 is greater than the compensation zone Z1, and the compensation voltage of the compensation zone Z3 is greater than the compensation zone Z2, that is, the compensation voltage of the compensation zone Z near the far end is greater than the compensation voltage of the compensation zone Z near the near end.
With continued reference to fig. 3, the pixels 15 may alternatively be arranged in rows along the second direction X and in columns along the first direction Y; the first direction Y intersects the second direction X; each compensation zone Z comprises at least one row of pixels. The pixels 15 may be arranged in rows along the first direction Y and in columns along the first direction X, and if the compensation zones Z are arranged in sequence along the first direction Y, each compensation zone Z includes at least one row of pixels 15, and in fig. 3, each compensation zone Z includes 2 rows of pixels as an example. As shown in fig. 4, fig. 4 is a schematic structural diagram of another display panel provided in an embodiment of the present invention, each compensation area Z may be provided with only one row of pixels, so that each row of pixels is provided with a corresponding compensation voltage, and the compensation precision is higher, so as to improve the accuracy and uniformity of the image display.
In addition to arranging the compensation areas Z in the first direction Y in sequence, the compensation areas may be arranged in an array manner in the whole display area AA, as shown in fig. 5, fig. 5 is a schematic structural diagram of another display panel provided in an embodiment of the present invention, and optionally, the display area AA may include a plurality of compensation areas Z arranged in an array manner; in the embodiment, the defining method of the compensation zone Z further considers the voltage drop caused by the problem of the process parameters of the light emitting units, and the process parameters of the light emitting units in different areas may be different, and the embodiment separately performs the test and calculation of the compensation voltages on the compensation zones in different areas, thereby further improving the brightness precision of the pixels in each compensation zone and improving the uniformity of the display of the picture.
Whether the compensation areas Z are arranged along the first direction Y, the compensation areas Z are arranged in an array arrangement mode, or the compensation areas Z are arranged in an irregular mode, each compensation area Z shares a compensation voltage, so that the compensation voltage calculation process of the pixel is simplified, and the compensation process of the pixel is completed rapidly. In another example, a plurality of pixels may be selected to acquire the compensation voltage, and the compensation voltage of the pixel may be averaged, and the average value is set as the compensation voltage of the compensation region Z, so that measurement errors can be avoided to a certain extent, the acquisition of the compensation voltage is more reliable, brightness accuracy of the pixel is improved, and display uniformity is improved.
Specifically, when the pixels are compensated by dividing the compensation areas, optionally, each compensation area may include a flag pixel therein; the driving chip can be used for obtaining the compensation voltage of the mark pixel according to the actual measurement current of the data line connected with the mark pixel; and the compensation voltage of the mark pixel is used as the compensation voltage of all pixels in the compensation area. The above-mentioned flag pixel is a pixel in the compensation area where the flag pixel is located, and the flag pixel may be selected from one of the compensation areas, or the pixels in the same position in different compensation areas are selected, for example, as shown in fig. 5, if each compensation area Z is provided with 4 pixels 15, the first pixel in each compensation area Z is selected as the flag pixel to obtain the compensation voltage, and the method for obtaining the flag pixel is not limited in particular in this embodiment.
In another example, optionally, a plurality of marker pixels may be included within each compensation zone; the driving chip is used for obtaining the compensation voltage of each mark pixel according to the actual measurement current of the data line connected with the mark pixel; and taking the average value of the compensation voltages of all the mark pixels as the compensation voltage of all the pixels in the compensation area. As shown in fig. 4, each compensation area includes a row of pixels, if 5 pixels are arbitrarily selected from each row of pixels, and the compensation voltages of the 5 pixels are obtained, then the values of the 5 compensation voltages are averaged to obtain an average value, and the average value is used as the compensation voltage of the compensation area, so that the accuracy of the compensation voltage of the compensation area is effectively improved, the accuracy of the picture display is further improved, the problem of brightness attenuation caused by the voltage drop of the data line and the voltage drop of the light emitting unit is effectively avoided, and the display non-uniformity is avoided.
Fig. 6 is a schematic structural diagram of another display panel according to an embodiment of the present invention, and optionally, the non-display area NA may further include a second non-display area NA2 located on a second side of the display area AA opposite to the first side in the first direction Y; the second non-display area NA2 includes a plurality of test terminals 16; the data detection circuit 14 is connected to the second end of the corresponding data line 13 through the corresponding test terminal 16.
As shown in fig. 1 to 5, the data detection circuit 14 may be a device provided on the display panel, and the data detection circuit 14 may be connected to the data line 13 directly through a metal line of the display panel driving circuit layer. In addition, the data detection circuit 14 may not be disposed on the display panel, and as shown in fig. 6, the display area AA includes two sides disposed opposite to each other: the first non-display area NA1 is located on the first side of the display area AA, the second non-display area NA2 is located on the second side of the display area AA, in this embodiment, the second non-display area NA2 includes a plurality of test terminals 16, the test terminals 16 are connected to the second ends of the corresponding data lines 13, and the data detection circuit 14 may be connected to the test terminals 16 through the pads 17, so as to electrically connect the data detection circuit 14 to the data lines 13. For example, when the driving current of the pixels is detected on the data line, the data detection circuit 14 may be connected to the test terminal 16 by a pseudo-voltage method, the connection method is simple and quick, and different display panels may share the data detection circuit 14 to obtain the actual measurement current of each pixel. After the data detection circuit 14 completes the detection of the actually measured current and sends the actually measured current to the driving chip 12, the test terminal 16 can be cut along the dotted line in fig. 6, so as to avoid the test terminal 16 occupying the space of the non-display area NA, which is beneficial to realizing the narrow frame design of the display panel. The compensation process of the pixel luminescence brightness in this embodiment needs to be concentrated in the test stage, and before the display panel leaves the factory, the test stage before the factory such as lighting test and impact test needs to be passed, the process of obtaining the compensation voltage of the pixel is also concentrated in the test stage in this embodiment, after the test of the compensation voltage is completed, the test terminal 16 is removed to form the finished product of the display panel, and then, during the display stage of the display panel, the theoretical data voltage overlaps the compensation voltage to drive the pixel, so as to avoid the pixel brightness attenuation, and improve the uniformity and the accuracy of the picture display.
Of course, for the display panel shown in fig. 1 to 5, the data detection circuit 14 is disposed on the driving circuit layer of the display panel, and the display panel may perform the acquisition of the compensation voltage of the pixel in both the test phase and the display phase, and for example, after the acquisition of the compensation voltage in the test phase is completed, in the display phase, the light emission compensation is performed on each pixel according to the compensation voltage acquired in the test phase. However, as the service life of the display panel increases, the voltage drop of the light emitting unit may further change, and the measured current of each pixel may be obtained again by the data detection circuit 14, so that the driving chip 12 corrects the compensation voltage of each pixel, thereby further improving the uniformity of the display.
Based on the same conception, the embodiment of the invention also provides a driving method of the display panel. The display panel in this embodiment may be a display panel provided in any embodiment of the present invention, as shown in fig. 1 and fig. 2, where the display panel includes a display area AA and a non-display area NA; the non-display area NA includes a first non-display area NA1 located at a first side of the display area AA in the first direction Y; the first non-display area NA1 includes a plurality of data terminals 11; the display panel includes a plurality of data lines 13 extending in a first direction Y; the data line 13 includes a first end adjacent to the first non-display area NA1 and a second end remote from the first non-display area NA1; a first end of the data line 13 is connected to the corresponding data terminal 11; the display panel includes a data detection circuit 14 and a driving chip 12; the data detection circuit 14 is connected to each data line 13; the driving chip 12 is connected to each data terminal 11. Fig. 7 is a flow chart of a driving method of a display panel according to an embodiment of the invention, as shown in fig. 7, the method of the embodiment includes the following steps:
step S110, in a test stage, controlling a data detection circuit to acquire actual measurement current of a data line; and controlling the driving chip to acquire compensation voltage according to the actually measured current.
In the step S120, in the display stage, the driving chip is controlled to superimpose the compensation voltage on the theoretical data voltage and output the theoretical data voltage to the corresponding data terminal.
It should be noted that, as shown in fig. 6, if the test terminal 16 is provided in the non-display area NA of the display panel in order to connect the data detection circuit 14 and the corresponding data line 13. After the test stage is finished and the required compensation voltage is obtained, the test terminal can be cut off by cutting and other processes, and the data detection circuit 14 and the test terminal 16 are separated from the display panel, so that the frame width of the display panel is further reduced, and the narrow frame design is realized. The driving chip 12 can retain the data of the compensation voltage, and compensates the theoretical data voltage of the pixel through the compensation voltage in the subsequent actual display stage of the display panel, so as to improve the display effect of the display panel.
Specifically, the data line 13 pulls the driving signal of each pixel to the test terminal 16, and the data detection circuit 14 may be connected to the test terminal 16 by a pseudo-voltage method to test the driving current flowing through the data line 13, that is, the actual measured current flowing through the current pixel driven by the data line 13. The data detection circuit 14 may obtain the measured current of all pixels on the display panel when the scanning line scans all pixels of the display area row by row, or the data detection circuit 14 may obtain the measured current from an optional plurality of pixels in all pixels on the display panel. Therefore, the driving chip 12 can obtain the compensation voltage of any pixel according to the actual measurement current, and superimpose the compensation voltage when the pixel is driven by the output data voltage, so that the display precision of the pixel is improved, and the problems of uneven display and afterimage are avoided.
Of course, as shown in fig. 1 to 5, the data detection circuit 14 may be directly formed on the display panel without providing a test terminal, and the data detection circuit 14 may be connected to each data line 13, so that the data detection circuit 14 may be started again to obtain the compensation voltage in the display stage, thereby correcting the compensation voltage according to the service life and the current state of the display panel, further improving the accuracy of pixel compensation, and improving the overall display uniformity of the display panel.
In the embodiment of the invention, the data detection circuit is arranged, the data detection circuit can acquire the actual measurement current on the data line in the scanning display process of the display panel, so as to acquire the actual measurement current of the pixel, the driving chip can store the theoretical data voltage required by the pixel, and the driving chip acquires the compensation voltage according to the actual measurement current and the theoretical data voltage output by the data detection circuit, so that the compensation voltage is overlapped with the theoretical data voltage to be output to the data terminal in the normal display process of the display panel, and is transmitted to the data line connected with the pixel through the data terminal, thereby completing the compensation of the pixel, and the like, and the compensation of any pixel of the display panel can be completed. According to the embodiment, the actual measurement current flowing through the pixels is measured, the final data voltage is compensated, the problems of display brightness attenuation, display unevenness and residual shadows caused by the voltage drop on the data line and the technological parameters of the light-emitting device are avoided, and the display uniformity is improved.
On the basis of the above embodiment, the display area includes a plurality of pixels; the pixels are arranged in rows along the second direction and in columns along the first direction; the first direction intersects the second direction;
The data detection circuit obtains the actual measurement current of the data line; the driving chip obtains the compensation voltage according to the actual measurement current, and the method can comprise the following steps: dividing a display area into a plurality of compensation areas, and acquiring at least one mark pixel from each compensation area; each compensation region includes a plurality of pixels; scanning pixels line by line; when scanning to the mark pixel, controlling the data detection circuit to obtain the actual measurement current of the data line connected with the mark pixel; the control driving chip obtains the compensation voltage of the mark pixel according to the actual measured current; if the compensation area comprises a mark pixel, the compensation voltage of the mark pixel is used as the compensation voltage of all pixels in the compensation area; if the compensation area comprises a plurality of mark pixels, the average value of the mark pixels is used as the compensation voltage of all the pixels in the compensation area. On the basis, superimposing the compensation voltage to the theoretical data voltage and outputting the theoretical data voltage to the corresponding data terminal may include: scanning pixels line by line; when scanning to the pixel of the compensation area, the control driving chip outputs the theoretical data voltage of the pixel to the compensation voltage of the pixel of the compensation area to the data line connected with the pixel.
Optionally, the display area includes a plurality of pixels; the control data detection circuit obtains the actual measurement current of the data line; the control driving chip obtains compensation voltage according to actual measurement current, including: scanning pixels line by line; when scanning to the current pixel, controlling a data detection circuit to acquire the actual measurement current of a data line connected with the current pixel; the control driving chip obtains the compensation voltage of the current pixel according to the actual measured current; superimposing the compensation voltage to the theoretical data voltage output to the corresponding data terminal, comprising: scanning pixels line by line; when scanning to the current pixel, the control driving chip outputs the theoretical data voltage of the current pixel to the data line connected with the current pixel by superposing the compensation voltage of the current pixel.
The embodiment of the invention also provides a display device. Fig. 8 is a schematic structural diagram of a display device according to an embodiment of the present invention, and as shown in fig. 8, the display device according to an embodiment of the present invention includes a display panel 200 according to any embodiment of the present invention. The electronic device may be a mobile phone as shown in fig. 8, or may be a computer, a television, an intelligent wearable device, etc., which is not limited in this embodiment.
Note that the above is only a preferred embodiment of the present invention and the technical principle applied. 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, while the invention has been described in connection with the above embodiments, the invention is not limited to the embodiments, but may be embodied in many other equivalent forms without departing from the spirit or scope of the invention, which is set forth in the following claims.
Claims (13)
1. A display panel, comprising: a display area and a non-display area; the non-display area comprises a first non-display area which is positioned on the first side of the display area in the first direction; the first non-display area includes a plurality of data terminals;
The display panel includes a plurality of data lines extending in the first direction; the data line comprises a first end close to the first non-display area and a second end far away from the first non-display area; the first end of the data line is connected with the corresponding data terminal;
The display panel comprises a data detection circuit and a driving chip; the data detection circuit is respectively connected with the data line and is used for acquiring the actual measurement current of the data line; the driving chip is respectively and electrically connected with the data terminal and the data detection circuit, and is used for acquiring compensation voltage according to the actual measurement current of the data line, superposing the compensation voltage to theoretical data voltage and outputting the theoretical data voltage to the corresponding data terminal;
the non-display area further includes a second non-display area located at a second side of the display area opposite to the first side in the first direction; the second non-display area comprises a plurality of test terminals;
the data detection circuit is connected to the second end of the corresponding data line through the corresponding test terminal;
The data detection circuit is connected with the test terminal in a pseudo-voltage mode, and after the data detection circuit completes detection of actual measurement current and sends the actual measurement current to the driving chip, the second non-display area is cut, so that the test terminal is removed.
2. The display panel of claim 1, wherein the display area includes a plurality of compensation areas along the first direction; each compensation area comprises a plurality of pixels;
In a direction from the first end of the data line to the second end of the data line, the compensation voltages corresponding to the compensation regions sequentially increase.
3. The display panel of claim 2, wherein the pixels are arranged in rows along a second direction and in columns along the first direction; the first direction intersects the second direction;
each compensation zone includes at least one row of pixels therein.
4. The display panel of claim 1, wherein the display area comprises a plurality of compensation areas arranged in an array; each compensation region includes a plurality of pixels.
5. The display panel of claim 2 or 4, wherein each of the compensation regions includes a logo pixel therein;
the driving chip is used for acquiring the compensation voltage of the mark pixel according to the actual measurement current of the data line connected with the mark pixel; and taking the compensation voltage of the mark pixel as the compensation voltage of all pixels in the compensation area.
6. The display panel of claim 2 or 4, wherein each of the compensation regions includes a plurality of flag pixels therein;
The driving chip is used for obtaining the compensation voltage of each mark pixel according to the actual measurement current of the data line connected with the mark pixel; and taking the average value of the compensation voltages of all the mark pixels as the compensation voltage of all the pixels in the compensation area.
7. The display panel of claim 1, wherein the display area comprises a plurality of pixels; the driving chip is used for obtaining the compensation voltage of each pixel according to the actual measurement current of the data line connected with each pixel.
8. The display panel of claim 1, wherein the driving chip comprises: a compensation calculation module;
The compensation calculation module is used for obtaining theoretical data voltage output to the data line by the driving chip according to the theoretical current of the data line obtained through simulation; the compensation calculation module is connected with the data detection circuit and is used for acquiring actual measurement data voltage according to the actual measurement current of the data line;
the compensation calculation module is further used for taking the difference value between the theoretical data voltage and the measured data voltage as the compensation voltage of the data line.
9. A driving method of a display panel, wherein the display panel includes a display area and a non-display area; the non-display area comprises a first non-display area which is positioned on the first side of the display area in the first direction; the first non-display area includes a plurality of data terminals; the display panel includes a plurality of data lines extending in the first direction; the data line comprises a first end close to the first non-display area and a second end far away from the first non-display area; the first end of the data line is connected with the corresponding data terminal; the display panel comprises a data detection circuit and a driving chip; the data detection circuit is respectively connected with each data line; the driving chip is connected with each data terminal; the non-display area further includes a second non-display area located at a second side of the display area opposite to the first side in the first direction; the second non-display area comprises a plurality of test terminals; the data detection circuit is connected to the second end of the corresponding data line through the corresponding test terminal; the data detection circuit is connected with the test terminal in a pseudo-voltage mode, and after the data detection circuit completes detection of actual measurement current and sends the actual measurement current to the driving chip, the second non-display area is cut, so that the test terminal is removed;
The driving method includes:
In the test stage, controlling the data detection circuit to acquire the actual measurement current of the data line; controlling the driving chip to acquire compensation voltage according to the actually measured current;
And in the display stage, controlling the driving chip to superimpose the compensation voltage on the theoretical data voltage and outputting the theoretical data voltage to the corresponding data terminal.
10. The driving method of a display panel according to claim 9, wherein the display region includes a plurality of pixels; the pixels are arranged in rows along a second direction and in columns along the first direction; the first direction intersects the second direction;
the data detection circuit obtains the actual measurement current of the data line; the driving chip obtains compensation voltage according to the actually measured current, and the method comprises the following steps:
dividing the display area into a plurality of compensation areas, and acquiring at least one mark pixel from each compensation area; each compensation region comprises a plurality of pixels;
scanning the pixels line by line; when scanning to the mark pixel, controlling the data detection circuit to acquire the actual measurement current of the data line connected with the mark pixel; controlling the driving chip to acquire the compensation voltage of the mark pixel according to the actually measured current;
if the compensation area comprises a mark pixel, the compensation voltage of the mark pixel is used as the compensation voltage of all pixels in the compensation area; if the compensation area comprises a plurality of mark pixels, the average value of the mark pixels is used as the compensation voltage of all the pixels in the compensation area.
11. The driving method of a display panel according to claim 10, wherein superimposing the compensation voltage to a theoretical data voltage output to a corresponding data terminal, comprises:
scanning the pixels line by line;
When scanning to the pixel of the compensation area, controlling the driving chip to output the theoretical data voltage of the pixel to the data line connected with the pixel by superposing the compensation voltage of the pixel of the compensation area.
12. The driving method of a display panel according to claim 9, wherein the display region includes a plurality of pixels;
controlling the data detection circuit to obtain the actual measurement current of the data line; controlling the driving chip to obtain a compensation voltage according to the actually measured current, including:
Scanning the pixels line by line; when scanning to the current pixel, controlling the data detection circuit to acquire the actual measurement current of the data line connected with the current pixel; controlling the driving chip to acquire the compensation voltage of the current pixel according to the actually measured current;
Superimposing the compensation voltage to a theoretical data voltage output to a corresponding data terminal, comprising:
Scanning the pixels line by line; when scanning to the current pixel, controlling the driving chip to output the theoretical data voltage of the current pixel to the compensation voltage of the current pixel in a superposition mode to the data line connected with the current pixel.
13. A display device comprising a display panel as claimed in any one of the preceding claims 1-8.
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| JP4010999B2 (en) * | 2003-08-25 | 2007-11-21 | 三菱電機株式会社 | Voltage fluctuation compensation device |
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