Display device, and common voltage compensation method for display panel

Abstract

Provided are a display device, and a common voltage compensation method for a display panel (10). The display device comprises the display panel (10) and at least one negative feedback circuit (20); the display panel (10) comprises a common electrode layer (11); the common electrode layer (11) comprises a plurality of common electrode regions (12); the plurality of common electrode regions (12) include at least one first region (13) and at least one second region (14); each first region (13) is provided with a detection interface (121); each second region (14) is provided with a compensation interface (122); each negative feedback circuit (20) comprises a first input end (21), a second input end (22), and a compensation output end (23); the first input end (21) is connected to the detection interface (121) and used for inputting of a real-time common voltage (VCOM_FB) of the detection interface (121); the second input end (22) is used for inputting of a standard common voltage (VCOM_O); the compensation output end (23) is connected to the compensation interface (122) and used for loading a compensation voltage (VCOM_PM) to the compensation interface (122). In this way, the common voltage can be maintained in a relatively stable state, picture crosstalk is mitigated, and the display picture quality is improved.

Description

Display device and common voltage compensation method of display panel TECHNICAL FIELD

[0001] The present application relates to the technical field of display, in particular to a display device and a common voltage compensation method of a display panel. BACKGROUND

[0002] With the rapid development of display technology, display panels, especially large-size, high-refresh-rate or touch-integrated display panels, have been widely used in various fields such as entertainment, education, security, etc., and users have higher requirements for the display quality of display panels.

[0003] The display panel can include a data line, a scan line and an upper plate common electrode. There is usually a parasitic capacitance between the data line and the scan line and the upper plate common electrode, so the voltage variation on the data line will also affect the voltage of the upper plate common electrode. However, due to the effect of capacitive coupling, the voltage of the upper plate common electrode deviates from the set value and cannot be restored in a short time, thereby easily forming a crosstalk phenomenon, which seriously affects the display quality. SUMMARY

[0004] Embodiments of the present application provide a display device and a common voltage compensation method of a display panel to improve the stability of the common voltage, improve the crosstalk phenomenon of the picture, and improve the display quality.

[0005] Technical solution: The embodiments of the present application provide a display device, comprising:

[0006] a display panel, the display panel comprising a common electrode layer, the common electrode layer comprising a plurality of common electrode sub-zones, the plurality of common electrode sub-zones comprising at least one first sub-zone and at least one second sub-zone, each first sub-zone being provided with a detection interface, and each second sub-zone being provided with a compensation interface;

[0007] at least one negative feedback circuit, each negative feedback circuit comprising a first input end, a second input end and a compensation output end, the first input end being connected to the detection interface for accessing the real-time common voltage of the detection interface, the second input end being used for accessing a standard common voltage, and the compensation output end being connected to the compensation interface for loading a compensation voltage to the compensation interface.

[0008] According to the display device provided by the above-mentioned embodiments of the present application, the embodiments of the present application further provide a common voltage compensation method of a display panel, the method comprising:

[0009] obtaining, by a negative feedback circuit, a real-time common voltage of a common electrode sub-zone to be detected on the display panel;

[0010] acquire a standard common voltage through the negative feedback circuit;

[0011] generate a compensation voltage through the negative feedback circuit based on a deviation between the real-time common voltage and the standard common voltage;

[0012] load the compensation voltage to a common electrode partition to be compensated on the display panel through the negative feedback circuit, to inversely compensate the real-time common voltage of the common electrode partition to be compensated. BRIEF DESCRIPTION OF DRAWINGS

[0013] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0014] Fig. 1 is a partial structure example schematic diagram of a display panel of the present application;

[0015] Fig. 2 is a structure schematic diagram of a display device of the present application;

[0016] Fig. 3 is a structure schematic diagram of a negative feedback circuit of the present application;

[0017] Fig. 4 is a schematic diagram of one of the examples of the display device of the present application;

[0018] Fig. 5 is a schematic diagram of the second example of the display device of the present application;

[0019] Fig. 6 is a schematic diagram of the third example of the display device of the present application;

[0020] Fig. 7 is a schematic diagram of the fourth example of the display device of the present application;

[0021] Fig. 8 is a whole flow schematic diagram of a common voltage compensation method of a display panel of the present application;

[0022] Reference signs:

[0023] 10 - display panel; 11 - common electrode layer; 12 - common electrode sub-area; 121 - detection interface; 122 - compensation interface; 13 - first sub-area; 14 - second sub-area; 15 - third sub-area; 16 - wiring layer; 20 - negative feedback circuit; 21 - first input terminal; 22 - second input terminal; 23 - compensation output terminal; 24 - operational amplifier; 241 - non-inverting input terminal; 242 - inverting input terminal; 243 - voltage output terminal; 25 - first resistor; 26 - second resistor; 27 - third resistor; 28 - fourth resistor; 30 - feedback wiring; 31 - first sub-wiring; 32 - second sub-wiring; 40 - compensation wiring; 41 - third sub-wiring; 42 - fourth sub-wiring. Embodiments of the present application

[0024] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0025] In the description of the present application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined as "first", "second" can explicitly or implicitly include one or more features. In the description of the present application, the meaning of "multiple" is two or more, at least one of which can be one, two or more, unless otherwise specifically limited.

[0026] The display device and the common voltage compensation method of the display panel provided by the embodiments of the present application can improve the stability of the common voltage, improve the picture crosstalk phenomenon, and improve the display quality.

[0027] The display device provided by the embodiments of the present application comprises:

[0028] The display panel comprises a common electrode layer, and the common electrode layer comprises a plurality of common electrode sub-areas, the plurality of common electrode sub-areas comprising at least one first sub-area and at least one second sub-area, each first sub-area being provided with a detection interface, and each second sub-area being provided with a compensation interface.

[0029] At least one negative feedback circuit, each negative feedback circuit comprising a first input end, a second input end and a compensation output end, the first input end being connected with the detection interface for accessing the real-time common voltage of the detection interface, the second input end being used for accessing the standard common voltage, and the compensation output end being connected with the compensation interface for loading the compensation voltage to the compensation interface.

[0030] In some embodiments, the number of common electrode partitions is M, the number of first partitions is one, and the number of second partitions and negative feedback circuits is N, satisfying: N = M-1, and M and N are integers;

[0031] The N first input ends are respectively connected with the detection interfaces of the first partition in correspondence, and the N compensation output ends are respectively connected with the compensation interfaces of the N second partitions in correspondence.

[0032] In some embodiments, N = 2; the first partition is provided with N detection interfaces, and the N detection interfaces are distributed at different positions of the corresponding first partition;

[0033] Each second partition is provided with at least two compensation interfaces, and the at least two compensation interfaces are distributed at different positions of the second partition.

[0034] In some embodiments, the column direction of the display panel is defined as the first direction, and the M common electrode partitions are arranged in sequence along the first direction;

[0035] Along the second direction, the N detection interfaces are distributed at two ends of the corresponding first partition, and the at least two compensation interfaces are distributed at two ends of the corresponding second partition, and the second direction intersects with the first direction.

[0036] In some embodiments, each detection interface is connected with the corresponding first input end through a feedback wire, and the feedback wire comprises a first sub-wire extending along the first direction and a second sub-wire extending along the second direction;

[0037] Each compensation interface is connected with the corresponding compensation output end through a compensation wire, and the compensation wire comprises a third sub-wire extending along the first direction and a fourth sub-wire extending along the second direction.

[0038] In some embodiments, the first partition is located between two second partitions.

[0039] In some embodiments, the display device comprises a display area and a non-display area, the non-display area is located at one side of the display area, the common electrode layer is located in the display area, and the negative feedback circuit is located in the non-display area; wherein

[0040] The first partition is located at one side of the two second partitions away from the non-display area.

[0041] In some embodiments, the plurality of common electrode partitions further comprises Z third partitions, each of the third partitions being provided with a detection interface and a compensation interface;

[0042] The number of common electrode partitions is M, the number of first partitions is K, the number of second partitions is P, and the number of negative feedback circuits is N, satisfying: K+P+Z=M, P+Z=N, K, P, N, and M are all positive integers;

[0043] The N first input terminals are respectively connected to the detection interfaces of the K first partitions and the detection interfaces of the Z third partitions, and the N compensation output terminals are respectively connected to the compensation interfaces of the P second partitions and the compensation interfaces of the Z third partitions;

[0044] The detection interface and the compensation interface of each third partition are connected to the same negative feedback circuit.

[0045] In some embodiments, the negative feedback circuit comprises an operational amplifier, and the operational amplifier has a non-inverting input terminal, an inverting input terminal, and a voltage output terminal;

[0046] The voltage output terminal is connected to the inverting input terminal through a first resistor, the inverting input terminal is connected to the first input terminal through a second resistor, the non-inverting input terminal is connected to the second input terminal through a third resistor, and the voltage output terminal is connected to the compensation output terminal through a fourth resistor.

[0047] The embodiments of the present application also provide a common voltage compensation method for a display panel, the method comprising:

[0048] Obtaining a real-time common voltage of a common electrode partition to be detected on the display panel through a negative feedback circuit;

[0049] Obtaining a standard common voltage through the negative feedback circuit;

[0050] Generating a compensation voltage based on a deviation between the real-time common voltage and the standard common voltage through the negative feedback circuit;

[0051] Loading the compensation voltage to a common electrode partition to be compensated on the display panel through the negative feedback circuit to inversely compensate the real-time common voltage of the common electrode partition to be compensated.

[0052] Advantages:

[0053] The display device provided by the embodiment of the present application comprises a display panel and at least one negative feedback circuit, the display panel comprises a common electrode layer, the common electrode layer comprises a plurality of common electrode subareas, the plurality of common electrode subareas comprise at least one first subarea and at least one second subarea, each first subarea is provided with a detection interface, each second subarea is provided with a compensation interface, each negative feedback circuit comprises a first input end, a second input end and a compensation output end, the first input end is connected with the detection interface and is used for inputting a real-time common voltage of the detection interface, the second input end is used for inputting a standard common voltage, and the compensation output end is connected with the compensation interface and is used for loading a compensation voltage to the compensation interface. The display device can perform subarea compensation on the common electrode layer in combination with the negative feedback circuit, compensate the common voltage in the opposite direction according to the voltage fluctuation of the common electrode subarea, so that the common voltage can be maintained in a relatively stable state, and then the picture crosstalk phenomenon is improved and the display quality is improved.

[0054] The embodiment of the present application will be further described below in combination with the drawings and specific embodiments:

[0055] Please refer to FIG. 1, which shows a partial structure example of the display panel according to the embodiment of the present application. The display panel 10 can comprise a plurality of display functional layers a, which can comprise a common electrode layer 11 and a wiring layer 16, the common electrode layer 11 is used for inputting a common voltage VCOM, and the wiring layer 16 comprises a data line and a scan line, the data line is used for inputting a data voltage, and the scan line is used for inputting a scan voltage.

[0056] Since the common electrode layer 11 is usually directly connected with the standard common voltage (i.e. VCOM_O voltage) through a line b, and the standard common voltage VCOM_O is generated by a PMIC (Power Management IC, power management integrated circuit), there is usually a parasitic capacitance between the data line and the scan line and the common electrode layer 11, and the common electrode layer 11 can be equivalent to a resistance-capacitance network. When the signal on the data line changes, the potential on the common electrode layer 11 will also be affected. Due to the influence of the capacitive coupling effect, the time length for the voltage on the common electrode layer 11 to deviate from the set value to recover to the set value is usually greater than the write time length of the data voltage, thereby causing the common voltage VCOM to fluctuate, and thus the crosstalk phenomenon is easily formed, which seriously affects the display quality, especially on a large-size, high-refresh-rate or touch-integrated display panel, the crosstalk phenomenon will be more obvious.

[0057] The embodiment of the present application provides a display device, which divides the common electrode layer into subareas, and reversely compensates the corresponding common voltage according to the real-time voltage fluctuation of the common electrode subarea through the negative feedback circuit, so that the common voltage can be maintained in a relatively stable state, and then the picture crosstalk is improved and the quality is improved, thereby at least part of the above technical problems can be solved.

[0058] Referring to FIG. 2, FIG. 2 shows the structure of the display device of the embodiment of the present application. The display device of the embodiment of the present application comprises a display panel 10 (not shown in the figure) and a negative feedback circuit 20. The display panel 10 comprises a common electrode layer 11, the common electrode layer 11 comprising a plurality of common electrode sub-zones 12, the plurality of common electrode sub-zones 12 comprising at least one first sub-zone 13 and at least one second sub-zone 14, each first sub-zone 13 being provided with a detection interface 121, and each second sub-zone 14 being provided with a compensation interface 122, that is to say, each first sub-zone 13 can be provided with only the detection interface 121, which is a common electrode sub-zone 12 for voltage detection, and each second sub-zone 14 can be provided with only the compensation interface 122, which is a common electrode sub-zone 12 for voltage compensation. The detection interface 121 is used to feed back the real-time common voltage VCOM_FB of the corresponding common electrode sub-zone 12, and the compensation interface 122 is used to receive the corresponding compensation voltage VCOM_PM. Exemplarily, the sizes of the plurality of common electrode sub-zones 12 can be the same.

[0059] The number of the negative feedback circuit 20 is at least one. Exemplarily, the number of the second sub-zone 14 is 2, and the number of the negative feedback circuit 20 is 2, or the number of the second sub-zone 14 is 3, and the number of the negative feedback circuit 20 is 3, and so on, and there can be various setting modes according to actual needs.

[0060] Each negative feedback circuit 20 comprises a first input end 21, a second input end 22 and a compensation output end 23, the first input end 21 being connected with the detection interface 121 of the corresponding first sub-zone 13, used to access the real-time common voltage VCOM_FB, the second input end 22 being connectable with the PMIC, used to obtain the standard common voltage VCOM_O, and the compensation output end 23 being connected with the compensation interface 122 of the corresponding second sub-zone 14, used to load the compensation voltage VCOM_PM to the compensation interface 122, so as to load the compensation voltage VCOM_PM to the corresponding second sub-zone 14 through the compensation interface 122, and reversely compensate the real-time common voltage VCOM_FB, the compensation voltage VCOM_PM being generated based on the real-time common voltage VCOM_FB and the standard common voltage VCOM_O.

[0061] It can be understood that the compensation voltage VCOM_PM loaded to any common electrode sub-zone 12 can act on the common voltage VCOM of the entire common electrode layer 11.

[0062] Please refer to FIG. 3, which shows the structure of the negative feedback circuit according to the embodiments of the present application. In some examples, the negative feedback circuit 20 can include an operational amplifier 24 having a non-inverting input terminal 241, an inverting input terminal 242 and a voltage output terminal 243. The voltage output terminal 243 is connected to the inverting input terminal 242 through a first resistor 25, the inverting input terminal 242 is connected to the first input terminal 21 through a second resistor 26, the non-inverting input terminal 241 is connected to the second input terminal 22 through a third resistor 27, and the voltage output terminal 243 is connected to the compensation output terminal 23 through a fourth resistor 28.

[0063] In application, the inverting input terminal 242 is connected to the real-time common voltage VCOM_FB, the non-inverting input terminal 241 is connected to the standard common voltage VCOM_O, and the voltage output terminal 243 outputs the compensation voltage VCOM_PM, wherein the compensation voltage VCOM_PM is opposite to the real-time common voltage VCOM_FB in direction, and the relationship between the compensation voltage VCOM_PM and the real-time common voltage VCOM_FB can be expressed by the following formula (1):

[0064]

[0065] In formula (1), R1 is the resistance value of the first resistor 25, and R2 is the resistance value of the second resistor 26. The compensation degree can be determined by the ratio of the resistance value of the first resistor 25 to the resistance value of the second resistor 26.

[0066] For example, the inverting input terminal 242 of the negative feedback circuit 20 is connected to the real-time common voltage VCOM_FB of 5.3V, the non-inverting input terminal 241 is connected to the standard common voltage VCOM_O of 5V, and the voltage output terminal 243 outputs the compensation voltage VCOM_PM of -5.3V. That is, when the real-time common voltage VCOM_FB deviates upward from the standard common voltage VCOM_O, the real-time common voltage VCOM_FB is compensated downward by the compensation voltage VCOM_PM, so that the real-time common voltage VCOM_FB can be maintained in a relatively stable state.

[0067] In the embodiments of the present application, at least one negative feedback circuit 20 can be provided as an independent circuit board near the source driving chip.

[0068] In some embodiments, the number of the common electrode partitions 12 is M, the number of the first partitions 13 is one, the number of the second partitions 14 and the number of the negative feedback circuits 20 are both N, and N = M-1 and M and N are both integers. The N first input ends 21 are respectively connected to the detection interfaces 121 of the first partition 13 in a one-to-one manner, and the N compensation output ends 23 are respectively connected to the compensation interfaces 122 of the N second partitions 14 in a one-to-one manner. That is, the real-time common voltage VCOM_FB of each second partition 14 can be compensated based on the change of the real-time common voltage VCOM_FB of the first partition 13. Each negative feedback circuit 20 can be used to compensate the real-time common voltage VCOM_FB of any second partition 14 according to the change of the real-time common voltage VCOM_FB of any first partition 13.

[0069] It can be understood that the number K of the first partitions 13 can also be set to two or more than two, and the number K of the first partitions 13 can be less than or equal to the number N of the second partitions 14. In this way, the voltage of the second partition 14 is compensated with the voltage of the first partition 13 as a reference, so that the compensation can be more convenient.

[0070] In the above manner, the number N of the negative feedback circuits 20 can be less than the number M of the common electrode partitions 12, which is not only convenient for layout, but also helps to control the cost of the control circuit.

[0071] The design of the common electrode partitions 12 and the connection relationship and compensation process between the common electrode partitions 12 and the negative feedback circuits 20 will be described below by specific examples in combination with the accompanying drawings.

[0072] Please refer to FIG. 4, which shows one of the examples of the display device according to the embodiments of the present application. In some examples, the number K of the first partitions 13 is one, the number N of the second partitions 14 is 2, and the number M of the common electrode partitions 12 is 3. The first partition 13 is provided with two detection interfaces 121, and the two detection interfaces 121 are distributed at different positions of the first partition 13. Each second partition 14 is provided with at least two compensation interfaces 122, and the at least two compensation interfaces 122 are distributed at different positions of the second partition 14. It can be understood that in this way, the voltage compensation can be more uniform, which is conducive to improving the in-plane common voltage uniformity. In addition, the number N of the second partitions 14 can also be greater than 2, and the detection interfaces 121 and the compensation interfaces 122 can also be provided with the remaining number or other arrangement, which is not limited in the embodiments of the present application.

[0073] In some examples, the column direction of the display panel 10 is defined as the first direction X, and the M common electrode partitions 12 are arranged in sequence along the first direction X. Along the second direction Y, two detection interfaces 121 are distributed at two ends of the corresponding first partition 13, and at least two compensation interfaces 122 are distributed at two ends of the corresponding second partition 14, and the second direction Y intersects the first direction X.

[0074] For example, the two detection interfaces 121 are symmetrically distributed at two ends of the corresponding first partition 13, and are both located at the center position. The at least two compensation interfaces 122 are symmetrically distributed at two ends of the corresponding second partition 14, and are both located at the center position.

[0075] For another example, the at least two compensation interfaces 122 can also be distributed at the edges of the corresponding second partition 14 and arranged uniformly.

[0076] In some examples, each detection interface 121 is connected to the corresponding first input end 21 through a feedback wire 30, and the feedback wire 30 includes a first sub-wire 31 extending along the first direction X and a second sub-wire 32 extending along the second direction Y. Each compensation interface 122 is connected to the corresponding compensation output end 23 through a compensation wire 40, and the compensation wire 40 includes a third sub-wire 41 extending along the first direction X and a fourth sub-wire 42 extending along the second direction Y. In this way, by adding the feedback wire 30 and the compensation wire 40 in the plane, the common electrode partitions 12 are connected to the negative feedback circuit 20, and the wires are connected by the sub-wires extending along the first direction X and the sub-wires extending along the second direction Y, which is also conducive to reducing the difficulty of wire processing and design.

[0077] In some examples, taking M=3, K=1, and N=2 as an example, the first partition 13 can be located between the two second partitions 14. For example, the display device can include a display area and a non-display area, the non-display area is located on one side of the display area, the common electrode layer 11 is located in the display area, and the negative feedback circuit 20 is located in the non-display area. The display area and the non-display area can be arranged along the first direction X, the first partition 13 can be located at the center position of the display area, and the two second partitions 14 can be oppositely arranged on the two sides of the first partition 13. For ease of description, in FIG. 4, the two second partitions 14 are respectively denoted as partitions ① and ③, and the first partition 13 is denoted as partition ②. The partitions ① and ③ are oppositely arranged on the two sides of the partition ② along the first direction X. The partition ② is provided with two detection interfaces 121 distributed at two ends of the partition ② along the second direction Y, the partition ① is provided with two compensation interfaces 122 distributed at two ends of the partition ① along the second direction Y, and the partition ③ is provided with four compensation interfaces 122 uniformly distributed on one side of the partition ③.

[0078] The number of negative feedback circuits 20 is 2. For ease of description, the two negative feedback circuits 20 are respectively identified as negative feedback circuit 20a and negative feedback circuit 20b in FIG. 4. The first input end 21 of the negative feedback circuit 20a is connected with the detection interface 121 on one side of the partition ②, for receiving the real-time common voltage VCOM_FB1 on one side of the partition ②. The second input end 22 is connected with the PMIC, for receiving the standard common voltage VCOM_O. The compensation output end 23 is connected with the four compensation interfaces 122 of the partition ③, for loading the compensation voltage VCOM_PM1 to the partition ③. The first input end 21 of the negative feedback circuit 20b is connected with the detection interface 121 on the other side of the partition ②, for receiving the real-time common voltage VCOM_FB2 on the other side of the partition ②. The second input end 22 is connected with the PMIC, for receiving the standard common voltage VCOM_O. The compensation output end 23 is connected with the two compensation interfaces 122 of the partition ①, for loading the compensation voltage VCOM_PM2 to the partition ①.

[0079] In the above manner, the N negative feedback circuits 20 detect the voltage of the same common electrode partition 12, take the voltage of the common electrode partition 12 as the reference voltage, and compensate the common electrode in different regions. When the voltage feedback through the middle common electrode partition 12 detects the change of the panel common electrode voltage, the negative feedback circuit 20 compensates the common voltage in the opposite direction, thereby improving the stability of the common electrode voltage.

[0080] Please refer to FIG. 5, which shows another example of the display device according to the embodiments of the present application. In some examples, the display device can include a display area and a non-display area, the non-display area is located on one side of the display area, the common electrode layer 11 is located in the display area, and the negative feedback circuit 20 is located in the non-display area. The first partition 13 is located on the side of the N second partitions 14 away from the non-display area. Taking M=3, K=1, and N=2 as examples, the display area and the non-display area can be arranged along the first direction X, and the two second partitions 14 can be arranged in the display area in sequence, and the first partition 13 is located on the side of the two second partitions 14 away from the non-display area. For ease of description, the first partition 13 is denoted as partition ①, and the two second partitions 14 are denoted as partitions ② and ③ in FIG. 5. The partitions ② and ③ are distributed along the first direction X, and the first partition 13 is located on the side of the two second partitions 14 away from the non-display area along the first direction X. The partition ① is provided with two detection interfaces 121, which are distributed at both ends of the partition ① along the second direction Y. The partition ② is provided with two compensation interfaces 122, which are distributed at both ends of the partition ② along the second direction Y. The partition ③ is provided with four compensation interfaces 122, which are uniformly distributed on one side of the partition ③.

[0081] The number of negative feedback circuits 20 is 2. For ease of description, the two negative feedback circuits 20 are respectively identified as negative feedback circuit 20a and negative feedback circuit 20b in FIG. 5. The first input end 21 of the negative feedback circuit 20a is connected with the detection interface 121 on one side of the partition ①, for receiving the real-time common voltage VCOM_FB1 on one side of the partition ①. The second input end 22 is connected with the PMIC, for receiving the standard common voltage VCOM_O. The compensation output end 23 is connected with the four compensation interfaces 122 of the partition ③, for loading the compensation voltage VCOM_PM1 to the partition ③. The first input end 21 of the negative feedback circuit 20b is connected with the detection interface 121 on the other side of the partition ①, for receiving the real-time common voltage VCOM_FB2 on the other side of the partition ①. The second input end 22 is connected with the PMIC, for receiving the standard common voltage VCOM_O. The compensation output end 23 is connected with the two compensation interfaces 122 of the partition ②, for loading the compensation voltage VCOM_PM2 to the partition ②.

[0082] In the above manner, the N negative feedback circuits 20 detect the voltage of the same common electrode partition 12, take the voltage of the common electrode partition 12 as the reference voltage, and compensate the common electrodes in different regions. When the panel common electrode voltage changes are detected by the feedback voltage of the common electrode partition 12 through the edge, the common voltage is compensated in the opposite direction by the negative feedback circuit 20, thereby improving the stability of the common electrode voltage.

[0083] Referring to FIG. 6, FIG. 6 illustrates a third example of the display device according to an embodiment of the present application. In some examples, the M common electrode partitions 12 are arranged in the second direction Y in sequence. Along the first direction X, at least two detection interfaces 121 are distributed at two ends of the corresponding first partition 13, and at least two compensation interfaces 122 are distributed at two ends of the corresponding second partition 14. For example, the at least two detection interfaces 121 are symmetrically distributed at two ends of the corresponding first partition 13, and are both located at the center position. The at least two compensation interfaces 122 are symmetrically distributed at two ends of the corresponding second partition 14, and are both located at the center position.

[0084] For example, taking M=3, K=1, and N=2 as an example, there are 3 common electrode partitions 12 arranged in the second direction Y in sequence. Among them, 1 first partition 13 is located at the center position of the display area, and 2 second partitions 14 are oppositely arranged at two sides of the first partition 13 along the second direction Y. For ease of description, the two second partitions 14 are respectively denoted as partitions ① and ③ in FIG. 6, and the first partition 13 is denoted as partition ②. The partition ② is provided with two detection interfaces 121 distributed at two ends of the partition ② along the first direction X. The partition ① is provided with two compensation interfaces 122 distributed at two ends of the partition ① along the first direction X. The partition ③ is provided with two compensation interfaces 122 distributed at two ends of the partition ③ along the first direction X.

[0085] The number of negative feedback circuits 20 is 2. For the convenience of description, the two negative feedback circuits 20 are respectively identified as negative feedback circuit 20a and negative feedback circuit 20b in FIG. 6. The first input end 21 of the negative feedback circuit 20a is connected with the detection interface 121 on one side of the partition ②, for receiving the real-time common voltage VCOM_FB1 on one side of the partition ②. The second input end 22 is connected with the PMIC, for receiving the standard common voltage VCOM_O. The compensation output end 23 is connected with the two compensation interfaces 122 of the partition ①, for loading the compensation voltage VCOM_PM1 to the partition ①. The first input end 21 of the negative feedback circuit 20b is connected with the detection interface 121 on the other side of the partition ②, for receiving the real-time common voltage VCOM_FB2 on the other side of the partition ②. The second input end 22 is connected with the PMIC, for receiving the standard common voltage VCOM_O. The compensation output end 23 is connected with the two compensation interfaces 122 of the partition ③, for loading the compensation voltage VCOM_PM2 to the partition ③.

[0086] In the above manner, when the feedback voltage of the middle common electrode partition 12 detects the change of the panel common electrode voltage, the negative feedback circuit 20 compensates the common voltage in the opposite direction, thereby improving the stability of the common electrode voltage, and the wiring is also more neat and convenient.

[0087] Please refer to FIG. 7, which shows the fourth example of the display device according to the embodiments of the present application. In some examples, the plurality of common electrode partitions 12 further include Z third partitions 15, and each third partition 15 is provided with a detection interface 121 and a compensation interface 122. That is to say, the third partition 15 is provided with both the detection interface 121 and the compensation interface 122, and is a common electrode partition 12 for compensating by detecting the change of its own voltage.

[0088] In the above manner, when the feedback voltage of the middle common electrode partition 12 detects the change of the panel common electrode voltage, the negative feedback circuit 20 compensates the common voltage in the opposite direction, thereby improving the stability of the common electrode voltage, and the wiring is also more neat and convenient.

[0089] That is to say, the real-time common voltage VCOM FB of each second partition 14 can be compensated based on the change of the real-time common voltage VCOM FB of the first partition 13, and the real-time common voltage VCOM FB of the corresponding third partition 15 can be compensated based on the change of the real-time common voltage VCOM FB of the third partition 15.

[0090] It can be understood that the number K of the first partitions 13 can be less than or equal to the number P of the second partitions 14. In this way, compensation can be more convenient.

[0091] Exemplarily, taking M=4, K=1, N=3, P=2, and Z=1 as an example, there are a total of 4 common electrode partitions 12 arranged in sequence along the first direction X, of which 1 is the first partition 13, located between 2 second partitions 14 distributed along the first direction X, and 1 third partition 15 is arranged on the side of one second partition 14 away from the first partition 13 along the first direction X. For ease of description, the third partition 15 is denoted as partition ①, the two second partitions 14 are denoted as partitions ② and ④ respectively, and the first partition 13 is denoted as partition ③ in FIG. 7. The partition ③ is provided with two detection interfaces 121 distributed at both ends of the partition ③ along the second direction Y, the partition ② is provided with two compensation interfaces 122 distributed at both ends of the partition ② along the second direction Y, the partition ④ is provided with four compensation interfaces 122 uniformly distributed on one side of the partition ④, and the partition ① is provided with one detection interface 121 and one compensation interface 122 distributed at both ends of the partition ① along the second direction Y.

[0092] The number of negative feedback circuits 20 is three. For the convenience of description, the three negative feedback circuits 20 are respectively identified as negative feedback circuit 20a, negative feedback circuit 20b and negative feedback circuit 20c in FIG. 7. The first input end 21 of the negative feedback circuit 20a is connected with the detection interface 121 on one side of the partition ③, for receiving the real-time common voltage VCOM_FB1 on one side of the partition ③. The second input end 22 is connected with the PMIC, for receiving the standard common voltage VCOM_O. The compensation output end 23 is connected with the four compensation interfaces 122 of the partition ④, for loading the compensation voltage VCOM_PM1 to the partition ④. The first input end 21 of the negative feedback circuit 20b is connected with the detection interface 121 on the other side of the partition ③, for receiving the real-time common voltage VCOM_FB2 on the other side of the partition ③. The second input end 22 is connected with the PMIC, for receiving the standard common voltage VCOM_O. The compensation output end 23 is connected with the two compensation interfaces 122 of the partition ②, for loading the compensation voltage VCOM_PM2 to the partition ②. The first input end 21 of the negative feedback circuit 20c is connected with the detection interface 121 of the partition ①, for receiving the real-time common voltage VCOM_FB3 of the partition ①. The second input end 22 is connected with the PMIC, for receiving the standard common voltage VCOM_O. The compensation output end 23 is connected with the compensation interface 122 of the partition ①, for loading the compensation voltage VCOM_PM3 to the partition ①.

[0093] In the above manner, the common voltage is detected through two paths. When the feedback voltage of the middle common electrode partition 12 detects the change of the panel common electrode voltage, the negative feedback circuit 20 compensates the common voltage in the opposite direction. When the feedback voltage of the edge common electrode partition 12 detects the change of the panel common electrode voltage, the negative feedback circuit 20 also compensates the common voltage in the opposite direction. Therefore, the stability of the common electrode voltage as a whole can be improved, the crosstalk phenomenon can be significantly improved, and the display effect can be improved.

[0094] In addition, in other examples, only one detection interface 121 can also be arranged on each first partition 13. The M common electrode partitions 12 can also include a second partition 14 and a third partition 15. The third partition 15 is used for detecting and compensating its own voltage, and the second partition 14 is used for compensation through the compensation voltage of the third partition 15. The connection mode of the negative feedback circuit 20 and each common electrode partition 12 can be flexibly selected according to actual conditions. The number and arrangement of the detection interface 121 and the compensation interface 122 on each common electrode partition 12 are not specifically limited, the specific corresponding relationship between the negative feedback circuit 20 and each common electrode partition 12 is not specifically limited, and the combination mode of the first partition 13, the second partition 14 and the third partition 15 is not specifically limited.

[0095] It can be understood that in other embodiments, each common electrode sub-area 12 can also be arbitrarily divided in other manners. If the display quality is satisfactory, the number of common electrode sub-areas 12 and the number of negative feedback circuits 20 can be appropriately reduced. If the display quality is not satisfactory, the number of common electrode sub-areas 12 and the number of negative feedback circuits 20 can be appropriately increased. The actual requirements can be set, and the present application embodiment does not make specific limitations.

[0096] In order to verify the common voltage compensation effect of the display device of the present application, the following will be described in combination with specific experimental results.

[0097] Taking the display device shown in FIG. 4 as an example, two detection interfaces 121 are symmetrically arranged on the first sub-area 13 (i.e. sub-area ②) in the middle for double-sided feedback, the second sub-area 14 (i.e. sub-area ①) at the far end is compensated by the compensation voltage VCOM_PM2, and the second sub-area 14 (i.e. sub-area ③) at the near end is compensated by the compensation voltage VCOM_PM1, which is determined as verification scheme 1. Only one detection interface 121 is arranged on the first sub-area 13 (i.e. sub-area ②) in the middle for single-sided feedback, the second sub-area 14 (i.e. sub-area ①) at the far end is compensated by the compensation voltage VCOM_PM2, and the second sub-area 14 (i.e. sub-area ③) at the near end is compensated by the compensation voltage VCOM_PM1, which is determined as verification scheme 2.

[0098] Taking the display device shown in FIG. 5 as an example, two detection interfaces 121 are symmetrically arranged on the first sub-area 13 (i.e. sub-area ①) at the far end for double-sided feedback, the second sub-area 14 (i.e. sub-area ②) in the middle is compensated by the compensation voltage VCOM_PM2, and the second sub-area 14 (i.e. sub-area ③) at the near end is compensated by the compensation voltage VCOM_PM1, which is determined as verification scheme 3. Only one detection interface 121 is arranged on the first sub-area 13 (i.e. sub-area ①) at the far end for single-sided feedback, the second sub-area 14 (i.e. sub-area ②) in the middle is compensated by the compensation voltage VCOM_PM2, and the second sub-area 14 (i.e. sub-area ③) at the near end is compensated by the compensation voltage VCOM_PM1, which is determined as verification scheme 4.

[0099] In addition, the two third sub-zones 15, one second sub-zone 14 are arranged in the first direction X in sequence from the far end to the near end, each third sub-zone 15 is symmetrically provided with a detection interface 121 and a compensation interface 122, and the second sub-zone 14 is provided with two compensation interfaces 122, for example, the number of negative feedback circuits 20 is 2, which are respectively identified as negative feedback circuit 20a and negative feedback circuit 20b. The negative feedback circuit 20a is used for receiving the real-time common voltage VCOM_FB1 of the third sub-zone 15 located at the far end, and loading the compensation voltage VCOM_PM1 to the third sub-zone 15 located at the far end and the second sub-zone 14 located at the near end at the same time. The negative feedback circuit 20b is used for receiving the real-time common voltage VCOM_FB2 of the third sub-zone 15 located at the middle, and loading the compensation voltage VCOM_PM2 to the third sub-zone 15 located at the middle. That is to say, the left side of the third sub-zone 15 located at the far end is fed back through VCOM_FB1, and the right side is compensated through VCOM_PM1, the left side of the third sub-zone 15 located at the middle is fed back through VCOM_FB2, and the right side is compensated through VCOM_PM2, and the second sub-zone 14 located at the near end is compensated through the compensation voltage VCOM_PM1, which is determined as verification scheme 5.

[0100] The display effect JND (Just Noticeable Difference, perceptible difference) of each verification scheme is obtained, and the display effect JND of directly inputting the standard common voltage VCOM_O to the common electrode layer (i.e. the original scheme 1) is obtained. The specific results are shown in Table 1.

[0101] Table 1: JND comparison of original scheme 1 and verification schemes 1 to 5

[0102]

[0103] By using the display device of the present application, the display effect is greatly improved compared with the traditional display device.

[0104] It can be understood that the display device of the present application can partition the common electrode layer 11, and increase the in-plane feedback wire 30 and the compensation wire 40, and combine the negative feedback circuit 20 for partition compensation, according to the voltage fluctuation of the common electrode partition, the common voltage is compensated in the opposite direction, so that the common voltage can be maintained in a relatively stable state, and the in-plane voltage uniformity is good, which can effectively improve the picture crosstalk phenomenon and significantly improve the display quality.

[0105] Correspondingly, please refer to FIG. 8, which shows the overall flow of the common voltage compensation method of the display panel of the present application. The common voltage compensation method of the display panel of the present application is applied to the display device of the present application, and specifically includes the following steps:

[0106] Step 801: obtaining, by the negative feedback circuit, a real-time common voltage of a common electrode subarea to be detected on the display panel.

[0107] Step 802: obtaining, by the negative feedback circuit, a standard common voltage.

[0108] Step 803: generating, by the negative feedback circuit, a compensation voltage based on a deviation between the real-time common voltage and the standard common voltage.

[0109] Step 804: loading, by the negative feedback circuit, the compensation voltage to the common electrode subarea to be compensated on the display panel, to reversely compensate the real-time common voltage of the common electrode subarea to be compensated.

[0110] It can be understood that features not described in detail in the common voltage compensation method of the display panel of the embodiments of the present application can refer to the relevant discussions of the display device of the foregoing embodiments, and each embodiment can be mutually referred to.

[0111] It can be understood that the common voltage compensation method of the embodiments of the present application can perform subarea compensation on the common electrode layer in combination with the negative feedback circuit, compensate the common voltage in the opposite direction according to the voltage fluctuation of the common electrode subarea, so that the common voltage can be maintained in a relatively stable state, thereby improving the picture crosstalk phenomenon and improving the display quality.

[0112] Correspondingly, the embodiments of the present application also provide a display device, which comprises the display device of the foregoing embodiments of the present application.

[0113] It can be understood that the display device of the embodiments of the present application can maintain the common voltage in a relatively stable state, is not prone to the picture crosstalk phenomenon, has good display quality, and has good user experience.

[0114] The common voltage compensation method of the display device and the display panel provided by the embodiments of the present application is described in detail above, and specific examples are applied in this paper to describe the principles and implementation manners of the present application. The above description of the embodiments is only used to help understand the technical solutions and core ideas of the present application; those skilled in the art should understand that they can modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to some technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A display device comprising a display panel and at least one negative feedback circuit, wherein: The display panel includes a common electrode layer, the common electrode layer includes a plurality of common electrode partitions, the plurality of common electrode partitions include at least one first partition and at least one second partition, each of the first partitions is provided with a detection interface, and each of the second partitions is provided with a compensation interface; Each of the negative feedback circuits includes a first input terminal, a second input terminal and a compensation output terminal, wherein the first input terminal is connected to the detection interface and is used to access the real-time common voltage of the detection interface, the second input terminal is used to access the standard common voltage, and the compensation output terminal is connected to the compensation interface and is used to load the compensation voltage to the compensation interface.

2. The display device according to claim 1, wherein The number of the common electrode partitions is M, the number of the first partition is one, the number of the second partitions and the number of the negative feedback circuits are both N, and N=M-1, where M and N are both integers; The N first input terminals are respectively connected to the detection interfaces of the first partition, and the N compensation output terminals are respectively connected to the compensation interfaces of the N second partitions.

3. The display device according to claim 2, wherein: N=2; N detection interfaces are provided on the first partition, and the N detection interfaces are distributed at different positions corresponding to the first partition; Each of the second partitions is provided with at least two compensation interfaces, and the at least two compensation interfaces are distributed at different positions of the second partition.

4. The display device according to claim 3, wherein The column direction of the display panel is defined as a first direction, and the M common electrode partitions are arranged in sequence along the first direction; Along a second direction, the N detection interfaces are distributed at two ends corresponding to the first partition, and at least two compensation interfaces are distributed at two ends corresponding to the second partition. The second direction intersects the first direction.

5. The display device according to claim 4, wherein Each of the detection interfaces is connected to the corresponding first input terminal via a feedback line, wherein the feedback line includes a first sub-line extending along the first direction and a second sub-line extending along the second direction; Each compensation interface is connected to the corresponding compensation output terminal via a compensation line, and the compensation line includes a third sub-line extending along the first direction and a fourth sub-line extending along the second direction. The display device according to claim 3 , wherein: The first partition is located between the two second partitions.

7. The display device according to claim 3, wherein: The display device includes a display area and a non-display area, the non-display area is located on one side of the display area, the common electrode layer is located in the display area, and the negative feedback circuit is located in the non-display area; The first partition is located on a side of the two second partitions away from the non-display area.

8. The display device according to claim 1, wherein The plurality of common electrode partitions further include Z third partitions, each of the third partitions being provided with the detection interface and the compensation interface; The number of the common electrode partitions is M, the number of the first partitions is K, the number of the second partitions is P, and the number of the negative feedback circuits is N, satisfying: K+P+Z=M, P+Z=N, K, P, N, and M are all positive integers; The N first input terminals are respectively connected to the K detection interfaces of the first partitions and the Z detection interfaces of the third partitions, and the N compensation output terminals are respectively connected to the P compensation interfaces of the second partitions and the Z compensation interfaces of the third partitions; The detection interface and the compensation interface of each third partition are connected to the same negative feedback circuit.

9. The display device according to any one of claims 1 to 8, wherein: The negative feedback circuit includes an operational amplifier having a non-inverting input terminal, an inverting input terminal and a voltage output terminal; The voltage output terminal is connected to the inverting input terminal through a first resistor, the inverting input terminal is connected to the first input terminal through a second resistor, the non-inverting input terminal is connected to the second input terminal through a third resistor, and the voltage output terminal is connected to the compensation output terminal through a fourth resistor.

10. A common voltage compensation method for a display panel, wherein: Applicable to the display device according to any one of claims 1 to 9; the method comprising: Acquiring the real-time common voltage of the common electrode partition to be detected on the display panel through a negative feedback circuit; Obtaining a standard common voltage through the negative feedback circuit; generating a compensation voltage based on a deviation between the real-time common voltage and the standard common voltage through the negative feedback circuit; The compensation voltage is applied to the common electrode subarea to be compensated on the display panel through the negative feedback circuit, so as to reversely compensate for the real-time common voltage of the common electrode subarea to be compensated.

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