Display driving device, display device and display driving method

Abstract

The invention discloses a display driving device, a display device and a display driving method. The display driving device comprises a voltage compensation module which is used for generating a first gamma reference signal according to a first initial reference signal and generating a second gamma reference signal according to a second initial reference signal, VGMPOUT = VGMPIN + DetalVGMP, VGSPOUT = VGSPIN + DetalVGSP, DetalVGMP is related to V1, V1 = ELVDD0-ELVDD1, ELVDD0 is an output voltage value of a first pixel power supply signal provided for a pixel circuit in a display panel, and ELVDD0 is an output voltage value of a second pixel power supply signal provided for a pixel circuit in the display panel. ELVDD1 is an actual voltage value of a first pixel power supply signal received by a pixel circuit in the display panel. According to the display driving device, the display device and the display driving method provided by the embodiment of the invention, the crosstalk compensation effect can be improved.

Description

Technical Field

[0001] The present invention relates to the field of display technology, and in particular to a display driving device, a display device and a display driving method. Background Art

[0002] Organic Light-Emitting Diode (OLED) display devices have the advantages of self-luminescence, no need for backlight, low power consumption and high brightness, and are widely used in various electronic devices.

[0003] The existing display device has a crosstalk problem at the junction of light and dark, and the corresponding compensation effect is not good, which affects the display effect of the picture. Summary of the invention

[0004] The invention provides a display driving device, a display device and a display driving method to improve the compensation effect of crosstalk.

[0005] According to one aspect of the present invention, there is provided a display driving device, comprising:

[0006] an initial reference signal generating module, electrically connected to the first power signal terminal, and configured to generate a first initial reference signal and a second initial reference signal according to a first power signal provided by the first power signal terminal, wherein a voltage value of the first initial reference signal is greater than a voltage value of the second initial reference signal;

[0007] a voltage compensation module, electrically connected to the initial reference signal generating module, and configured to generate a first gamma reference signal according to the first initial reference signal, and to generate a second gamma reference signal according to the second initial reference signal;

[0008] a driving module, electrically connected to the voltage compensation module, and configured to drive the display panel to display according to the first gamma reference signal and the second gamma reference signal;

[0009] Wherein, the voltage value of the first initial reference signal is VGMP_IN, the voltage value of the second initial reference signal is VGSP_IN, the voltage value of the first gamma reference signal is VGMP_OUT, and the voltage value of the second gamma reference signal is VGSP_OUT;

[0010] VGMP_OUT=VGMP_IN+Detal_VGMP;

[0011] VGSP_OUT=VGSP_IN+Detal_VGSP;

[0012] Detal_VGMP is related to V1, V1 = ELVDD0-ELVDD1;

[0013] ELVDD0 is an output voltage value of a first pixel power signal provided to a pixel circuit in the display panel, and ELVDD1 is an actual voltage value of the first pixel power signal received by the pixel circuit in the display panel.

[0014] According to another aspect of the present invention, a display device is provided, comprising the display driving device according to the first aspect.

[0015] According to another aspect of the present invention, there is provided a display driving method, comprising:

[0016] Acquire a first power supply signal, and generate a first initial reference signal and a second initial reference signal according to the first power supply signal, wherein a voltage value of the first initial reference signal is greater than a voltage value of the second initial reference signal;

[0017] generating a first gamma reference signal and a second gamma reference signal according to the first initial reference signal and the second initial reference signal;

[0018] driving a display panel to display according to the first gamma reference signal and the second gamma reference signal;

[0019] Wherein, the voltage value of the first initial reference signal is VGMP_IN, the voltage value of the second initial reference signal is VGSP_IN, the voltage value of the first gamma reference signal is VGMP_OUT, and the voltage value of the second gamma reference signal is VGSP_OUT;

[0020] VGMP_OUT=VGMP_IN+Detal_VGMP;

[0021] VGSP_OUT=VGSP_IN+Detal_VGSP;

[0022] Detal_VGMP is related to V1;

[0023] V1 = ELVDD0 - ELVDD1;

[0024] ELVDD0 is an output voltage value of a first pixel power signal provided to a pixel circuit in the display panel, and ELVDD1 is an actual voltage value of the first pixel power signal received by the pixel circuit in the display panel.

[0025] The display driving device, the display device and the display driving method provided by the embodiments of the present invention are provided in the display driving device, wherein a voltage compensation module connected between the initial reference signal generating module and the driving module is provided to compensate the first initial reference signal VGMP0 and the second initial reference signal VGSP0 generated by the initial reference signal generating module to obtain the first gamma reference signal VGMP1 and the second gamma reference signal VGSP1, wherein the voltage value VGMP_OUT of the first gamma reference signal VGMP1 is the sum of the voltage value VGMP_IN of the first initial reference signal VGMP0 plus the first compensation value Detal_VGMP, the voltage value VGSP_OUT of the second gamma reference signal VGSP1 is the sum of the voltage value VGSP_IN of the second initial reference signal VGSP0 plus the second compensation value Detal_VGSP, and the first compensation value Detal_VGMP and the second compensation value Detal_VGSP are both equal to the output voltage value ELVDD0 of the first pixel power supply signal and the actual voltage value ELVDD1. The difference V1 between the first gamma reference signal VGMP1 and the second gamma reference signal VGSP1 output by the voltage compensation module is related to each other, so that the voltage value VGMP_OUT of the first gamma reference signal VGMP1 output by the voltage compensation module and the voltage value VGSP_OUT of the second gamma reference signal VGSP1 change with the output voltage value ELVDD0 of the first pixel power supply signal. Furthermore, the driving module generates the data voltage DATA based on the first gamma reference signal VGMP1 and the second gamma reference signal VGSP1, so that the display panel displays each gray scale based on the data voltage DATA. In this way, the voltage value VGMP_OUT of the first gamma reference signal VGMP1 output by the voltage compensation module and the voltage value VGSP_OUT of the second gamma reference signal VGSP1 change with the output voltage value ELVDD0 of the first pixel power supply signal within a suitable range, thereby reducing the influence of the change of the output voltage value ELVDD0 of the first pixel power supply signal on the gray scale value actually displayed by the sub-pixel, and improving the compensation effect of crosstalk.

[0026] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present invention, nor are they intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0028] Figure 1A schematic diagram of the structure of a display driving device provided by an embodiment of the present invention;

[0029] Figure 2 It is a structural schematic diagram of a display driving device in the related art;

[0030] Figure 3 A schematic diagram of the structure of a display panel provided by an embodiment of the present invention;

[0031] Figure 4 A partial structural schematic diagram of a pixel circuit provided by an embodiment of the present invention;

[0032] Figure 5 A schematic diagram of the crosstalk phenomenon of a display panel at the junction of light and dark in the related art;

[0033] Figure 6 A schematic diagram of a compensation process of a display panel in the related art;

[0034] Figure 7 A schematic diagram of the structure of another display driving device provided by an embodiment of the present invention;

[0035] Figure 8 A schematic structural diagram of another display driving device provided by an embodiment of the present invention;

[0036] Fig. 9 A schematic structural diagram of another display driving device provided by an embodiment of the present invention;

[0037] Fig.10 A schematic diagram of the structure of a display device provided by an embodiment of the present invention;

[0038] Fig.11 A schematic flow chart of a display driving method provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0039] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0040] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0041] Figure 1 A schematic diagram of the structure of a display driving device provided by an embodiment of the present invention is shown in FIG. Figure 1 As shown, the display driving device 100 provided by the embodiment of the present invention includes:

[0042] The initial reference signal generating module 10 is electrically connected to the first power signal terminal 30, and is used to generate a first initial reference signal VGMP0 and a second initial reference signal VGSP0 according to the first power signal provided by the first power signal terminal 30, and the voltage value of the first initial reference signal VGMP0 is greater than the voltage value of the second initial reference signal VGSP0.

[0043] The voltage compensation module 11 is electrically connected to the initial reference signal generating module 10 , and is used to generate a first gamma reference signal VGMP1 according to the first initial reference signal VGMP0 , and to generate a second gamma reference signal VGSP1 according to the second initial reference signal VGSP0 .

[0044] The driving module 12 is electrically connected to the voltage compensation module 11 , and is used to drive the display panel 200 to display according to the first gamma reference signal VGMP1 and the second gamma reference signal VGSP1 .

[0045] The voltage value of the first initial reference signal VGMP0 is VGMP_IN, the voltage value of the second initial reference signal VGSP0 is VGSP_IN, the voltage value of the first gamma reference signal VGMP1 is VGMP_OUT, and the voltage value of the second gamma reference signal VGSP1 is VGSP_OUT.

[0046] VGMP_OUT=VGMP_IN+Detal_VGMP; VGSP_OUT=VGSP_IN+Detal_VGSP.

[0047] Detal_VGMP is related to V1, V1=ELVDD0-ELVDD1.

[0048] ELVDD0 is an output voltage value of a first pixel power signal provided to a pixel circuit in the display panel 200 , and ELVDD1 is an actual voltage value of the first pixel power signal received by the pixel circuit in the display panel 200 .

[0049] Among them, the display driving device provided by the embodiment of the present invention can transmit grayscale voltage to the pixel circuit in the display panel 200 according to the received image signal, so that each pixel circuit in the display panel 200 drives the light-emitting element to emit light, thereby enabling the display panel 200 to realize the display function.

[0050] Specifically, Figure 1 As shown, the initial reference signal generating module 10 in the display driving device receives the first power signal provided by the first power signal terminal 30, and generates a first initial reference signal VGMP0 and a second initial reference signal VGSP0 based on the first power signal, wherein the first initial reference signal VGMP0 has a higher voltage value, which can be used to determine the minimum grayscale brightness of the display panel 200, that is, the dark state brightness; the second initial reference signal VGSP0 has a smaller voltage value, which can be used to determine the maximum grayscale brightness of the display panel 200.

[0051] Among them, the initial reference signal generating module 10 can also be electrically connected to the second power signal terminal 31, and the second power signal terminal 31 is used to provide a reference ground voltage AVSS to the initial reference signal generating module 10, which can ensure the stability and accuracy of the generated first initial reference signal VGMP0 and the second initial reference signal VGSP0.

[0052] Figure 2 FIG. 1 is a schematic diagram of a display driving device in the related art. Figure 2 As shown, in the related art, the initial reference signal generating module 10 is directly electrically connected to the driving module 12, the driving module 12 receives the first initial reference signal VGMP0 and the second initial reference signal VGSP0 provided by the initial reference signal generating module 10, and generates a data voltage DATA based on the first initial reference signal VGMP0 and the second initial reference signal VGSP0, and then provides the data voltage DATA to the display panel 200, and the display panel 200 displays various gray scales based on the data voltage DATA.

[0053] Specifically, Figure 3 A schematic diagram of the structure of a display panel provided by an embodiment of the present invention is shown in FIG. Figure 3As shown, the display panel 200 includes a plurality of scan lines 21 extending along the row direction, and a plurality of data lines 22 extending along the column direction. The plurality of scan lines 21 and the plurality of data lines 22 are cross-arranged to define a plurality of pixel areas. A pixel circuit PX can be set in each pixel area, and a plurality of pixel circuits PX are arrayed in the display panel 200. Each pixel circuit PX is correspondingly connected to a light-emitting element. The pixel circuit PX can drive the correspondingly connected light-emitting element to perform light-emitting display, wherein the pixel circuit PX and the light-emitting element connected thereto together constitute a sub-pixel in the display panel.

[0054] The light-emitting element may be an organic light-emitting diode (OLED) or a micro light-emitting diode (Micro-LED), etc., which is not specifically limited in the embodiment of the present invention.

[0055] Furthermore, the gate driving module 300 transmits a scanning signal to each row of pixel circuits PX in sequence through the scanning line 21. When each row of pixel circuits PX receives the scanning signal, the display driving device 100 transmits a data voltage DATA to each column of pixel circuits PX in the row of pixel circuits PX through the data line 22, so that each pixel circuit PX in the display panel 200 drives the light-emitting elements to emit light row by row, so that the display panel 200 realizes the display function.

[0056] It should be noted that Figure 3 Only the case where the display driving device 100 and the gate driving module 300 are both arranged outside the display panel 200 is shown. In other embodiments, the display driving device 100 and the gate driving module 300 can also be arranged in the non-display area of ​​the display panel 200, but it is not limited to this. The embodiments of the present invention do not make specific limitations on this.

[0057] Figure 4 A partial structural diagram of a pixel circuit provided by an embodiment of the present invention is shown in FIG. Figure 4 As shown, optionally, the pixel circuit PX includes a driving transistor T1, a data writing transistor T2 and a storage capacitor Cs, and the driving transistor T1 and the light-emitting element 23 are connected in series between a first pixel power signal terminal 31 and a second pixel power signal terminal 32, wherein the first pixel power signal terminal 31 is used to provide a first pixel power signal, the second pixel power signal terminal 32 is used to provide a second pixel power signal, and the output voltage value ELVDD0 of the first pixel power signal is greater than the output voltage value ELVSS of the second pixel power signal.

[0058] When the pixel circuit PX drives the corresponding light-emitting element 23 to emit light, a scanning signal Gate is first provided to the gate of the data writing transistor T2 to turn on the data writing transistor T2. The data voltage DATA provided by the display driving device 100 is transmitted to the gate of the driving transistor T1 through the data writing transistor T2 and can be stored in the storage capacitor Cs. When the driving transistor T1 is turned on, the driving current Id formed by the driving transistor T1 according to the data voltage DATA flows through the light-emitting element 23, thereby driving the light-emitting element 23 to emit light with a brightness of a corresponding gray scale, wherein the gray scale value is determined by the data voltage DATA.

[0059] It can be understood that the brightness of the light-emitting element 23 is related to the size of the driving current Id flowing through the source and drain of the driving transistor T1. The size of the driving current Id is determined by the gate voltage of the driving transistor T1, and the gate voltage of the driving transistor T1 is determined by the data voltage DATA. Therefore, the size of the data voltage DATA will directly affect the brightness of each sub-pixel in the display panel 20, that is, the size of the data voltage DATA will directly affect the grayscale value actually displayed by each sub-pixel in the display panel 20.

[0060] The inventors have found through research that the display driving device 100 provides the data voltage DATA to the pixel circuit PX of the sub-pixel row by row. When the grayscale value of the sub-pixel in the adjacent row suddenly changes, the corresponding data voltage DATA will also suddenly change. At this time, the actual voltage value of the first pixel power signal will fluctuate due to the capacitive coupling effect, so that a difference is generated between the actual voltage value ELVDD1 of the first pixel power signal and the output voltage value ELVDD0 of the first pixel power signal, thereby affecting the grayscale value actually displayed by the sub-pixel, resulting in a crosstalk problem.

[0061] For example, Figure 5 Schematic diagram of crosstalk phenomenon of a display panel at the junction of light and dark in the related art. Figure 5 As shown, at the junction of light and dark on the screen, due to the sudden change in the grayscale value of the adjacent row sub-pixel, the corresponding data voltage DATA also suddenly changes, and due to the parasitic capacitance coupling, a deviation occurs between the actual voltage value ELVDD1 of the first pixel power signal and the output voltage value ELVDD0, resulting in the actual display grayscale value of the sub-pixel at the junction of light and dark on the screen not meeting expectations, resulting in unnecessary brightness increase or decrease, thereby forming a crosstalk area 201, affecting the display effect of the picture.

[0062] Based on the above technical problems, in the related art, the grayscale difference between adjacent rows of sub-pixels can be calculated, the grayscale value of the sub-pixel can be compensated according to the grayscale difference, and the sub-pixel can be driven to display with the compensated grayscale value, thereby improving the crosstalk problem.

[0063] After further research, the inventors found that the first pixel power signal is provided by a power management chip (Power IC), wherein the wiring through which the power management chip outputs the first pixel power signal to the display panel 200 is longer, resulting in a larger resistance of the wiring, causing a correspondingly larger voltage drop (Drop) of the first pixel power signal. As a result, there is a large gap between the actual voltage value ELVDD1 of the first pixel power signal received by the pixel circuit PX on the display panel 200 and its output voltage value ELVDD0, which can easily lead to insufficient power supply in certain areas of the display panel 200, thereby affecting the display uniformity of the display panel 200.

[0064] Based on the above technical problem, the power management chip will start the dynamic compensation of the output voltage value ELVDD0 of the first pixel power signal to maintain the display brightness of each area of ​​the display panel 200.

[0065] Specifically, according to the difference between the output voltage value ELVDD0 of the first pixel power signal and the actual voltage value ELVDD1 of the first pixel power signal received by the pixel circuit PX, the output voltage value ELVDD0 of the first pixel power signal is adjusted to compensate for the voltage drop of the first pixel power signal during the transmission process, and the power management chip outputs the adjusted voltage value so that the actual voltage value ELVDD1 of the first pixel power signal received by the pixel circuit PX can reach the originally expected output voltage value.

[0066] For example, if the actual voltage value ELVDD1 of the first pixel power signal received by the expected pixel circuit PX is 4.6V, and the output voltage value ELVDD0 of the first pixel power signal is 4.6V, since the wiring of the power management chip to output the first pixel power signal to the display panel 200 is long, the first pixel power signal produces a voltage drop, and the actual voltage value ELVDD1 of the first pixel power signal received by the pixel circuit PX may only reach 4.5V, then the output voltage value ELVDD0 of the first pixel power signal can be adjusted to a voltage value greater than 4.6V (for example, 4.7V) so that the actual voltage value ELVDD1 of the first pixel power signal can reach the expected 4.6V.

[0067] It should be noted that, in the process of adjusting the output voltage value ELVDD0 of the first pixel power signal, the module that originally outputs the output voltage value ELVDD0 of the first pixel power signal may not be changed, for example, it still outputs 4.6V, and the output voltage value ELVDD0 of the first pixel power signal may be adjusted by other algorithm modules (Intellectual Property, IP) (for example, the original output voltage value is raised) to compensate for the voltage drop caused by the first pixel power signal, so that the actual voltage value ELVDD1 of the first pixel power signal received by the pixel circuit PX can reach the originally expected output voltage value (for example, 4.6V). The embodiment of the present invention does not specifically limit this.

[0068] Figure 6 FIG. 1 is a schematic diagram of a compensation process of a display panel in a related art. Figure 4 and Figure 6 As shown, the inventors have found through further research that under the condition of the same luminous brightness, in order to maintain a constant driving current Id, the difference between the source voltage of the driving transistor T1 and the gate voltage of the driving transistor T1 should remain unchanged, and the gate voltage of the driving transistor T1 is determined by the data voltage DATA. In the related art, the data voltage DATA is determined by the first initial reference signal VGMP0 and the second initial reference signal VGSP0. Therefore, the voltage difference between the voltage value VGMP_IN of the first initial reference signal VGMP0 and the output voltage value ELVDD0 of the first pixel power signal is usually kept unchanged, and the voltage difference between the voltage value VGSP_IN of the second initial reference signal VGSP0 and the output voltage value ELVDD0 of the first pixel power signal is kept unchanged. Then, when the output voltage value ELVDD0 of the first pixel power signal is adjusted, the voltage value VGMP_IN of the first initial reference signal VGMP0 and the voltage value VGSP_IN of the second initial reference signal VGSP0 will also change dynamically with the change of the output voltage value ELVDD0 of the first pixel power signal.

[0069] For example, when the output voltage value ELVDD0 of the first pixel power signal is raised by 0.1V, the voltage value VGMP_IN of the first initial reference signal VGMP0 and the voltage value VGSP_IN of the second initial reference signal VGSP0 are also raised by 0.1V to ensure that the voltage difference between the voltage value VGMP_IN of the first initial reference signal VGMP0 and the output voltage value ELVDD0 of the first pixel power signal remains unchanged, and the voltage difference between the voltage value VGSP_IN of the second initial reference signal VGSP0 and the output voltage value ELVDD0 of the first pixel power signal remains unchanged.

[0070] Furthermore, in the related art, the data voltage DATA is obtained by the voltage value VGMP_IN of the first initial reference signal VGMP0 and the voltage value VGSP_IN of the second initial reference signal VGSP0. Therefore, after the voltage value VGMP_IN of the first initial reference signal VGMP0 and the voltage value VGSP_IN of the second initial reference signal VGSP0 change with the output voltage value ELVDD0 of the first pixel power supply signal, the data voltage DATA will also change accordingly, thereby affecting the grayscale value actually displayed by the sub-pixel, and further affecting the compensation effect of crosstalk.

[0071] Based on the above problems, continue to refer to Figure 1 In the embodiment of the present invention, a voltage compensation module 11 is provided in the display driving device 100. The voltage compensation module 11 is connected between the initial reference signal generating module 10 and the driving module 12. The voltage compensation module 11 is used to receive the first initial reference signal VGMP0 and the second initial reference signal VGSP0 generated by the initial reference signal generating module 10, and compensate the first initial reference signal VGMP0 and the second initial reference signal VGSP0 to generate the first gamma reference signal VGMP1 and the second gamma reference signal VGSP1.

[0072] The voltage value VGMP_OUT of the first gamma reference signal VGMP1 is the sum of the voltage value VGMP_IN of the first initial reference signal VGMP0 and the first compensation value Detal_VGMP, that is, VGMP_OUT=VGMP_IN+Detal_VGMP.

[0073] The voltage value VGSP_OUT of the second gamma reference signal VGSP1 is the sum of the voltage value VGSP_IN of the second initial reference signal VGSP0 and the second compensation value Detal_VGSP, that is, VGSP_OUT=VGSP_IN+Detal_VGSP.

[0074] Furthermore, the driving module 12 receives the first gamma reference signal VGMP1 and the second gamma reference signal VGSP1 obtained after the voltage compensation module 11 compensates the first initial reference signal VGMP0 and the second initial reference signal VGSP0, and generates a data voltage DATA based on the first gamma reference signal VGMP1 and the second gamma reference signal VGSP1, and then provides the data voltage DATA to the display panel 200, so that the display panel 200 displays various gray scales based on the data voltage DATA.

[0075] Among them, in the related art, the difference between the voltage value VGMP_IN of the first initial reference signal VGMP0 and the output voltage value ELVDD0 of the first pixel power signal is a fixed value, and the difference between the voltage value VGSP_IN of the second initial reference signal VGSP0 and the output voltage value ELVDD0 of the first pixel power signal is a fixed value, and in this embodiment, the voltage value VGMP_IN of the first initial reference signal VGMP0 is compensated by the first compensation value Detal_VGMP through the voltage compensation module 11 to obtain the voltage value VGMP_OUT of the first gamma reference signal VGMP1, and the voltage value VGMP_OUT of the second initial reference signal VGSP0 is compensated by the first compensation value Detal_VGMP. VGSP_IN compensates the second compensation value Detal_VGSP to obtain the voltage value VGSP_OUT of the second gamma reference signal VGSP1, and the first compensation value Detal_VGMP and the second compensation value Detal_VGSP are both related to the difference V1 between the output voltage value ELVDD0 of the first pixel power signal and the actual voltage value ELVDD1, so that the voltage value VGMP_OUT of the first gamma reference signal VGMP1 output by the voltage compensation module 11 and the voltage value VGSP_OUT of the second gamma reference signal VGSP1 can change with the degree to which the output voltage value ELVDD0 of the first pixel power signal changes.

[0076] For example, when the output voltage value ELVDD0 of the first pixel power signal is raised by 0.1V, the voltage value VGMP_IN of the first initial reference signal VGMP0 and the voltage value VGSP_IN of the second initial reference signal VGSP0 are only raised by 0.01V, obtaining the voltage value VGMP_OUT of the first gamma reference signal VGMP1 and the voltage value VGSP_OUT of the second gamma reference signal VGSP1.

[0077] By adjusting the voltage value VGMP_OUT of the first gamma reference signal VGMP1 and the voltage value VGSP_OUT of the second gamma reference signal VGSP1 to change within a suitable range following the output voltage value ELVDD0 of the first pixel power signal, the influence of the change of the output voltage value ELVDD0 of the first pixel power signal on the grayscale value actually displayed by the sub-pixel can be reduced, thereby improving the compensation effect of crosstalk.

[0078] It should be noted that the first compensation value Detal_VGMP and the second compensation value Detal_VGSP are both related to the difference V1 between the output voltage value ELVDD0 of the first pixel power signal and the actual voltage value ELVDD1, which may mean that the first compensation value Detal_VGMP and the second compensation value Detal_VGSP are both linearly related to V1. For example, the relationship between the first compensation value Detal_VGMP and V1 can be expressed by a first-order polynomial, and the relationship between the second compensation value Detal_VGSP and V1 can also be expressed by a first-order polynomial.

[0079] By setting in this way, the proportional relationship between the first compensation value Detal_VGMP and V1, and between the second compensation value Detal_VGSP and V1 can be made simple, easy to implement and debug.

[0080] In other embodiments, the first compensation value Detal_VGMP and the second compensation value Detal_VGSP are both related to V1, which may also mean that the first compensation value Detal_VGMP and the second compensation value Detal_VGSP are both in a nonlinear relationship with V1. For example, the relationship between the first compensation value Detal_VGMP and V1 can be expressed by a quadratic polynomial or an exponential function, and the relationship between the second compensation value Detal_VGSP and V1 can also be expressed by a quadratic polynomial or an exponential function, etc.

[0081] With such configuration, the compensation strategy can be adjusted more flexibly to adapt to different display panels 200 and achieve a better crosstalk compensation effect, but the present invention is not limited thereto.

[0082] Among them, by setting the first compensation value Detal_VGMP and the second compensation value Detal_VGSP to be related to V1, the voltage value of the compensated first gamma reference signal VGMP1 to VGMP_OUT and the voltage value of the second gamma reference signal VGSP1 to VGSP_OUT can be more adapted to the change of the output voltage value ELVDD0 of the first pixel power signal, so that the voltage value of the first gamma reference signal VGMP1 to VGMP_OUT and the voltage value of the second gamma reference signal VGSP1 to VGSP_OUT are within a stable range, which helps to prevent over-compensation or under-compensation and reduce display abnormalities, thereby improving the stability and consistency of the display of the display panel 200.

[0083] In summary, the display driving device provided by the embodiment of the present invention is provided with a voltage compensation module connected between the initial reference signal generating module and the driving module in the display driving device to compensate the first initial reference signal VGMP0 and the second initial reference signal VGSP0 generated by the initial reference signal generating module to obtain the first gamma reference signal VGMP1 and the second gamma reference signal VGSP1, wherein the voltage value VGMP_OUT of the first gamma reference signal VGMP1 is the sum of the voltage value VGMP_IN of the first initial reference signal VGMP0 plus the first compensation value Detal_VGMP, the voltage value VGSP_OUT of the second gamma reference signal VGSP1 is the sum of the voltage value VGSP_IN of the second initial reference signal VGSP0 plus the second compensation value Detal_VGSP, and the first compensation value Detal_VGMP and the second compensation value Detal_VGSP are both equal to the output voltage value ELVDD0 of the first pixel power supply signal and the actual voltage value ELVDD 1, so that the voltage value VGMP_OUT of the first gamma reference signal VGMP1 output by the voltage compensation module and the voltage value VGSP_OUT of the second gamma reference signal VGSP1 change with the output voltage value ELVDD0 of the first pixel power signal. Further, the driving module generates the data voltage DATA based on the first gamma reference signal VGMP1 and the second gamma reference signal VGSP1, so that the display panel displays each gray scale based on the data voltage DATA. In this way, the voltage value VGMP_OUT of the first gamma reference signal VGMP1 output by the voltage compensation module and the voltage value VGSP_OUT of the second gamma reference signal VGSP1 change with the output voltage value ELVDD0 of the first pixel power signal within a suitable range, thereby reducing the influence of the change of the output voltage value ELVDD0 of the first pixel power signal on the gray scale value actually displayed by the sub-pixel, and improving the compensation effect of crosstalk.

[0084] Optionally, Detal_VGMP=aV1+b, Detal_VGSP=cV1+d, where a, b, c and d are all real numbers.

[0085] In this embodiment, the linear relationship Detal_VGMP=aV1+b, Detal_VGSP=cV1+d is used to determine the first compensation value Detal_VGMP and the second compensation value Detal_VGSP. The proportional relationship is simple and easy to implement and debug.

[0086] Among them, by adjusting the proportional coefficients a and c, the rate at which the first compensation value Detal_VGMP and the second compensation value Detal_VGSP change with V1 can be controlled, thereby adjusting the degree to which the voltage value VGMP_OUT of the first gamma reference signal VGMP1 and the voltage value VGSP_OUT of the second gamma reference signal VGSP1 follow the output voltage value ELVDD0 of the first pixel power signal, so that the degree to which the voltage value VGMP_OUT of the first gamma reference signal VGMP1 and the voltage value VGSP_OUT of the second gamma reference signal VGSP1 follow the output voltage value ELVDD0 of the first pixel power signal is within a suitable range.

[0087] Furthermore, by adjusting the correction factors b and d, the first compensation value Detal_VGMP and the second compensation value Detal_VGSP can be fine-tuned, and the degree to which the voltage value VGMP_OUT of the first gamma reference signal VGMP1 and the voltage value VGSP_OUT of the second gamma reference signal VGSP1 follow the output voltage value ELVDD0 of the first pixel power signal can be adjusted more accurately, thereby reducing the influence of the change of the output voltage value ELVDD0 of the first pixel power signal on the grayscale value actually displayed by the sub-pixel, and improving the compensation effect of crosstalk.

[0088] Optional, |a|≤1; |c|≤1.

[0089] Among them, if a and c are too large or too small, the absolute values ​​of the first compensation value Detal_VGMP and the second compensation value Detal_VGSP may be greater than the difference V1 between the output voltage value ELVDD0 of the first pixel power signal and the actual voltage value ELVDD1, thereby causing the compensation degree of the first initial reference signal VGMP0 and the second initial reference signal VGSP0 to exceed the fluctuation range of the output voltage value ELVDD0 of the first pixel power signal, resulting in over-compensation, which may further cause abnormal display effect of the display panel 200.

[0090] In this embodiment, by setting |a|≤1 and |c|≤1 as the constraints of the proportional coefficient, the first compensation value Detal_VGMP and the second compensation value Detal_VGSP can be prevented from being too large or too small, ensuring that the compensation amount of the first initial reference signal VGMP0 and the second initial reference signal VGSP0 is within a reasonable range, so that the voltage value VGMP_OUT of the first gamma reference signal VGMP1 and the voltage value VGSP_OUT of the second gamma reference signal VGSP1 change with the output voltage value ELVDD0 of the first pixel power supply signal within a suitable range, avoiding over-compensation and causing display abnormality.

[0091] Optionally, b=V1 / e, d=V1 / f, the bit width of e is greater than the bit width of a, the bit width of f is greater than the bit width of c, and both e and f are integers.

[0092] Among them, bit width refers to the number of binary bits occupied when a value is represented in a computer. The larger the bit width, the larger the range of values ​​represented and the higher the precision.

[0093] In this embodiment, a and c have smaller bit widths, that is, fewer bits are allocated to a and c to represent their values, which can reduce the consumption of computing resources.

[0094] Optionally, the bit width of a and c can be as low as 4 bits, so a and c can represent 16 different values, but it is not limited thereto.

[0095] Among them, the compensation value can be preliminarily adjusted by adjusting the proportional coefficients a and c to ensure that the change trend of the first compensation value Detal_VGMP and the second compensation value Detal_VGSP conforms to the change trend of the output voltage value ELVDD0 of the first pixel power signal. In addition, during the debugging process, by adjusting the proportional coefficients a and c, a significant change in the output voltage value ELVDD0 of the first pixel power signal can be quickly responded to, which helps to improve the debugging speed.

[0096] Further, b is a correction factor of the first compensation value Detal_VGMP, which is the result of dividing V1 by e, wherein the bit width of e is larger, that is, more bits are allocated to e to represent its value, so that e can represent a larger value range, thereby making the value setting of b more precise.

[0097] Similarly, d is the correction factor of the second compensation value Detal_VGSP, which is the result of dividing V1 by f. Since the bit width of f is larger, that is, more bits are allocated to f to represent its value, so that f can represent a larger value range, the value setting of d can be more precise.

[0098] Optionally, the bit width of b and d may be 8 bits or 10 bits, and b and d can represent 256 or 1024 different values, but are not limited thereto.

[0099] Among them, by adjusting the correction factors b and d, the setting accuracy of the first compensation value Detal_VGMP and the second compensation value Detal_VGSP can be improved, ensuring that the compensation of the first initial reference signal VGMP0 and the second initial reference signal VGSP0 is more accurate, avoiding the problem of over-compensation or under-compensation, and is conducive to improving the compensation effect of crosstalk.

[0100] Optional, -V1≤Detal_VGMP≤V1, -V1≤Detal_VGSP≤V1.

[0101] As mentioned above, when the absolute values ​​of the first compensation value Detal_VGMP and the second compensation value Detal_VGSP are greater than the difference V1 between the output voltage value ELVDD0 of the first pixel power signal and the actual voltage value ELVDD1, the degree of compensation for the first initial reference signal VGMP0 and the second initial reference signal VGSP0 may exceed the fluctuation range of the output voltage value ELVDD0 of the first pixel power signal, resulting in over-compensation, which may cause abnormal display effect of the display panel 200.

[0102] In this embodiment, by setting -V1≤Detal_VGMP≤V1, -V1≤Detal_VGSP≤V1, it is possible to avoid the first compensation value Detal_VGMP and the second compensation value Detal_VGSP being too large or too small, ensuring that the compensation amount of the first initial reference signal VGMP0 and the second initial reference signal VGSP0 is within a reasonable range, so that the voltage value VGMP_OUT of the first gamma reference signal VGMP1 and the voltage value VGSP_OUT of the second gamma reference signal VGSP1 change with the output voltage value ELVDD0 of the first pixel power supply signal within a suitable range, thereby avoiding over-compensation and causing display abnormality.

[0103] Optionally, VGMP_OUT≤AVDD, VGSP_OUT≤VGMP_OUT, and AVDD is a voltage value of the first power supply signal.

[0104] In the embodiment of the present invention, the voltage value VGMP_OUT of the first gamma reference signal VGMP1 corresponds to the minimum grayscale brightness, ie, dark state brightness, of the display panel 200 , while the voltage value VGSP_OUT of the second gamma reference signal VGSP1 corresponds to the maximum grayscale brightness of the display panel 200 .

[0105] Taking the image data received by the display panel 200 as an example, the display driving device can provide 2 8 , that is, 256 gamma voltages, the minimum grayscale is 0 grayscale, and the maximum grayscale is 255 grayscale.

[0106] Among them, Figure 1 As shown, by setting the voltage value VGMP_OUT of the first gamma reference signal VGMP1 to be less than or equal to the voltage value AVDD of the first power signal, it is possible to avoid applying an excessively high data voltage DATA to the display panel 200, thereby ensuring the display effect of the display panel 200 at a low gray scale and ensuring the stability and consistency of the dark state brightness.

[0107] Furthermore, by setting the voltage value VGSP_OUT of the second gamma reference signal VGSP1 to be less than or equal to the voltage value VGMP_OUT of the first gamma reference signal VGMP1 , the display abnormality of the display panel 200 can be avoided.

[0108] It should be noted that the value ranges of a, b, c and d can be set with reference to the constraint relationship between the voltage value VGMP_OUT of the first gamma reference signal VGMP1 and the voltage value VGSP_OUT of the second gamma reference signal VGSP1 to ensure normal display of the display panel 200, and the embodiment of the present invention does not specifically limit this.

[0109] Figure 7 A schematic diagram of the structure of another display driving device provided by an embodiment of the present invention is shown in FIG. Figure 7 As shown, optionally, the voltage compensation module 11 includes a gamma reference signal generating unit 111 and a feedback unit 112. The gamma reference signal generating unit 111 is electrically connected to the initial reference signal generating module 10, and is used to generate a first gamma reference signal VGMP1 according to the first initial reference signal VGMP0, and to generate a second gamma reference signal VGSP1 according to the second initial reference signal VGSP0. The feedback unit 112 is electrically connected to the gamma reference signal generating unit 111, and is used to increase the current values ​​of the first gamma reference signal VGMP1 and the second gamma reference signal VGSP1.

[0110] Specifically, Figure 7 As shown, the gamma reference signal generating unit 111 in the voltage compensation module 11 is used to generate a first gamma reference signal VGMP1 according to a first initial reference signal VGMP0, and to generate a second gamma reference signal VGSP1 according to a second initial reference signal VGSP0, wherein the relationship between the first initial reference signal VGMP0 and the first gamma reference signal VGMP1, and the relationship between the second initial reference signal VGSP0 and the second gamma reference signal VGSP1 can refer to any of the above-mentioned embodiments and will not be repeated here.

[0111] Furthermore, a feedback unit 112 is provided in the voltage compensation module 11. After being processed by the feedback unit 112, the current values ​​of the first gamma reference signal VGMP1 and the second gamma reference signal VGSP1 output by the gamma reference signal generating unit 111 increase, thereby amplifying the driving capability of the first gamma reference signal VGMP1 and the second gamma reference signal VGSP1, which helps to improve the anti-interference capability of the display panel 200.

[0112] Meanwhile, after being processed by the feedback unit 112 , the voltage values ​​of the first gamma reference signal VGMP1 and the second gamma reference signal VGSP1 output by the gamma reference signal generating unit 111 remain unchanged, so as to ensure the accuracy of the generated data voltage DATA and make the grayscale values ​​actually displayed by the sub-pixels in the display panel 200 more accurate.

[0113] The feedback unit 112 can monitor the voltage and current values ​​of the first gamma reference signal VGMP1 and the second gamma reference signal VGSP1 through a negative feedback mechanism, and dynamically adjust the gain of the current amplification according to the monitoring result to ensure that the current value is always within a reasonable range, but is not limited thereto.

[0114] Continue to refer Figure 7 Optionally, the gamma reference signal generating unit 111 may include a first gamma reference signal generating unit 111A and a second gamma reference signal generating unit 111B, and the feedback unit 112 may include a first feedback unit 112A and a second feedback unit 112B.

[0115] The first gamma reference signal generating unit 111A is used to generate a first gamma reference signal VGMP1 according to the first initial reference signal VGMP0 . The first feedback unit 112A is electrically connected to the first gamma reference signal generating unit 111A and is used to increase the current value of the first gamma reference signal VGMP1 .

[0116] The second gamma reference signal generating unit 111B is used to generate a second gamma reference signal VGSP1 according to the second initial reference signal VGSP0 . The second feedback unit 112B is electrically connected to the second gamma reference signal generating unit 111B and is used to increase the current value of the second gamma reference signal VGSP1 .

[0117] Among them, the gamma reference signal generating unit 111 is divided into two independent parts (such as the first gamma reference signal generating unit 111A and the second gamma reference signal generating unit 111B), and similarly, the feedback unit 112 is divided into two independent parts (such as the first feedback unit 112A and the second feedback unit 112B), which can respectively control the sizes of the first gamma reference signal VGMP1 and the second gamma reference signal VGSP1, so as to more finely control the compensation and current amplification of the first gamma reference signal VGMP1 and the second gamma reference signal VGSP1, and improve the driving capabilities of the first gamma reference signal VGMP1 and the second gamma reference signal VGSP1.

[0118] Continue to refer Figure 7 Optionally, the feedback unit 112 includes an operational amplifier.

[0119] Specifically, Figure 7As shown, the operational amplifier may include a first operational amplifier 41 and a second operational amplifier 42 .

[0120] The first operational amplifier 41 is located in the first feedback unit 112A in the feedback unit 112, and the first input terminal of the first operational amplifier 41 is connected to the first gamma reference signal generating unit 111A to access the first gamma reference signal VGMP1 output by the first gamma reference signal generating unit 111A, and the second input terminal of the first operational amplifier 41 is connected to its own output terminal, and the output terminal of the first operational amplifier 41 is used to output the first gamma reference signal VGMP1 with an increased current value.

[0121] The second operational amplifier 42 is located in the second feedback unit 112B in the feedback unit 112, and a first input terminal of the second operational amplifier 42 is connected to the second gamma reference signal generating unit 111B to access the second gamma reference signal VGSP1 output by the second gamma reference signal generating unit 111B, and a second input terminal of the second operational amplifier 42 is connected to its own output terminal, and an output terminal of the second operational amplifier 42 is used to output a second gamma reference signal VGSP1 with an increased current value.

[0122] Among them, the second input terminal of the operational amplifier is connected to its own output terminal to form a negative feedback loop. At this time, the operational amplifier constitutes a voltage follower. The output voltage of the voltage follower can follow or track the input voltage, and the voltage gain is 1, that is, the output voltage of the operational amplifier is equal to its input voltage. Although the voltage remains unchanged, the output impedance of the operational amplifier is very low, and a large current gain can be provided, thereby providing power gain. While keeping the voltage values ​​of the input first gamma reference signal VGMP1 and the second gamma reference signal VGSP1 unchanged, the output current values ​​of the first gamma reference signal VGMP1 and the second gamma reference signal VGSP1 can be increased, thereby improving its driving capability.

[0123] It should be noted that the structure of the feedback unit 112 is not limited to the above embodiment, and the embodiment of the present invention does not make any specific limitation on this.

[0124] Figure 8 A schematic diagram of the structure of another display driving device provided by an embodiment of the present invention is shown in FIG. Figure 8As shown, optionally, the voltage compensation module 11 includes a gamma reference signal generating unit 111, a first capacitor C1 and a second capacitor C2. The gamma reference signal generating unit 111 is electrically connected to the initial reference signal generating module 10, and is used to generate a first gamma reference signal VGMP1 according to the first initial reference signal VGMP0, and to generate a second gamma reference signal VGSP1 according to the second initial reference signal VGSP0. The gamma reference signal generating unit 111 includes a first output terminal 1111 and a second output terminal 1112, the first output terminal 1111 is used to output the first gamma reference signal VGMP1, and the second output terminal 1112 is used to output the second gamma reference signal VGSP1. The first end of the first capacitor C1 is electrically connected to the first output terminal 1111, the second end of the first capacitor C1 is grounded, the first end of the second capacitor C2 is electrically connected to the second output terminal 1112, and the second end of the second capacitor C2 is grounded.

[0125] The specific structure of the gamma reference signal generating unit 111 may refer to any of the above embodiments, which will not be described in detail here.

[0126] In this embodiment, if Figure 8 As shown, the first output terminal 1111 of the gamma reference signal generating unit 111 outputs the compensated first gamma reference signal VGMP1, and the first capacitor C1 is connected between the first output terminal 1111 and the ground, which can filter and smooth the signal, reduce the interference of other signals on the first gamma reference signal VGMP1, suppress noise, thereby reducing the noise and ripple in the first gamma reference signal VGMP1, and ensure the stability of the first gamma reference signal VGMP1.

[0127] Similarly, the second output terminal 1112 of the gamma reference signal generating unit 111 outputs the compensated second gamma reference signal VGSP1, and the second capacitor C2 is connected between the second output terminal 1112 and the ground, which can filter and smooth the signal, reduce the interference of other signals on the second gamma reference signal VGSP1, suppress noise, thereby reducing the noise and ripple in the second gamma reference signal VGSP1, and ensuring the stability of the second gamma reference signal VGSP1.

[0128] Fig. 9 A schematic diagram of the structure of another display driving device provided by an embodiment of the present invention is shown in FIG. Fig. 9As shown, optionally, the driving module 12 includes a gamma voltage generating module 121 and a data voltage converting module 122. The gamma voltage generating module 121 is electrically connected to the voltage compensation module 11, and is used to receive the first gamma reference signal VGMP1 and the second gamma reference signal VGSP1, and generate a gamma voltage according to the first gamma reference signal VGMP1 and the second gamma reference signal VGSP1. The data voltage converting module 122 is electrically connected to the gamma voltage generating module 121, and is used to receive the gamma voltage and generate a data voltage according to the gamma voltage.

[0129] The gamma voltage generating module 121 may divide the voltage between the first gamma reference signal VGMP1 and the second gamma reference signal VGSP1 to obtain the gamma voltage.

[0130] For example, the gamma voltage generating module 121 can generate n gamma voltages, including gamma voltages Vg1, Vg2, Vg3, . . . , Vg n-1 and Vg n The gamma voltage Vg1 may be equal to the first gamma reference signal VGMP1, and the gamma voltage Vg n can be equal to the second gamma reference signal VGSP1, the gamma voltages Vg2 to Vg n-1 It may be a voltage obtained by dividing a voltage between the first gamma reference signal VGMP1 and the second gamma reference signal VGSP1 .

[0131] The data voltage conversion module 122 converts the original data signal (Source) into a data voltage DATA suitable for the display panel 200 according to the gamma voltage, and transmits the data voltage DATA to the display panel 200 to drive each sub-pixel to display each gray scale.

[0132] Based on the same inventive concept, an embodiment of the present invention further provides a display device, which includes the display driving device described in any embodiment of the present invention. Therefore, the display device provided by the embodiment of the present invention has the technical effect of the technical solution in any of the above embodiments, and the structures that are the same or corresponding to the above embodiments and the explanation of terms are no longer repeated here.

[0133] Fig.10 A schematic diagram of a display device according to an embodiment of the present invention is shown in FIG. Fig.10As shown, the display device includes a display driving device 100, a display panel 200 and a power management chip 400, wherein the power management chip 400 is used to provide a first pixel power signal (output voltage value is ELVDD0) and a second pixel power signal (output voltage value is ELVSS) to the display panel 200, and provide a first power signal (voltage value is AVDD) to the display driving device 100. The display driving device 100 is used to provide a data voltage DATA to the display panel 200 to drive the display panel 200 to display an image.

[0134] The display driver device 100 may be integrated into a display driver chip (Display Driver Integrated Circuit, DDIC) or a touch and display driver integration (Touch and Display Driver Integration, TDDI) chip, but is not limited thereto.

[0135] The display device provided in the embodiment of the present invention can be a mobile phone or any electronic product with a display function, including but not limited to the following categories: televisions, laptops, desktop displays, tablet computers, digital cameras, smart bracelets, smart glasses, car displays, medical equipment, industrial control equipment, touch interactive terminals, etc. The embodiment of the present invention does not make any special limitations on this.

[0136] Based on the same inventive concept, an embodiment of the present invention further provides a display driving method. This embodiment can be applicable to the case of driving a display panel for display. The display driving method can be executed by a display driving device. The display driving device can be implemented in the form of hardware and / or software. The display driving device can be configured in a display driver chip (Display Driver Integrated Circuit, DDIC) or a touch and display driver integration (Touch and Display Driver Integration, TDDI) chip.

[0137] Fig.11 A flow chart of a display driving method provided by an embodiment of the present invention is shown in FIG. Fig.11 As shown, the display driving method includes:

[0138] S11. Acquire a first power signal, and generate a first initial reference signal and a second initial reference signal according to the first power signal, wherein a voltage value of the first initial reference signal is greater than a voltage value of the second initial reference signal.

[0139] Specifically, the first power signal may be an analog power voltage provided by a power management chip (Power IC), which may be used to convert the data signal into a data voltage DATA to control the display brightness of the sub-pixels in the display panel.

[0140] A first initial reference signal VGMP0 and a second initial reference signal VGSP0 are generated based on the voltage value AVDD of the first power supply signal, wherein the first initial reference signal VGMP0 has a higher voltage value, which can be used to determine the minimum grayscale brightness of the display panel 200, that is, the dark state brightness; the second initial reference signal VGSP0 has a smaller voltage value, which can be used to determine the maximum grayscale brightness of the display panel 200.

[0141] S12 , generating a first gamma reference signal and a second gamma reference signal according to the first initial reference signal and the second initial reference signal.

[0142] The first gamma reference signal VGMP1 and the second gamma reference signal VGSP1 are obtained by compensating the first initial reference signal VGMP0 and the second initial reference signal VGSP0.

[0143] S13 , driving the display panel to display according to the first gamma reference signal and the second gamma reference signal.

[0144] Specifically, the data voltage DATA is generated based on the first gamma reference signal VGMP1 and the second gamma reference signal VGSP1 and then provided to the display panel 200 , so that the display panel 200 displays various gray scales based on the data voltage DATA.

[0145] Further, the voltage value of the first initial reference signal VGMP0 is VGMP_IN, the voltage value of the second initial reference signal VGSP0 is VGSP_IN, the voltage value of the first gamma reference signal VGMP1 is VGMP_OUT, the voltage value of the second gamma reference signal VGSP1 is VGSP_OUT, VGMP_OUT=VGMP_IN+Detal_VGMP; VGSP_OUT=VGSP_IN+Detal_VGSP, Detal_VGMP is related to V1, V1=ELVDD0-ELVDD1, ELVDD0 is the output voltage value of the first pixel power signal provided to the pixel circuit in the display panel 200, and ELVDD1 is the actual voltage value of the first pixel power signal received by the pixel circuit in the display panel 200.

[0146] Among them, the voltage value VGMP_OUT of the first gamma reference signal VGMP1 is the sum of the voltage value VGMP_IN of the first initial reference signal VGMP0 plus the first compensation value Detal_VGMP, the voltage value VGSP_OUT of the second gamma reference signal VGSP1 is the sum of the voltage value VGSP_IN of the second initial reference signal VGSP0 plus the second compensation value Detal_VGSP, and the first compensation value Detal_VGMP and the second compensation value Detal_VGSP are both related to the difference V1 between the output voltage value ELVDD0 of the first pixel power signal and the actual voltage value ELVDD1, so that the voltage value VGMP_OUT of the first gamma reference signal VGMP1 and the voltage value VGSP_OUT of the second gamma reference signal VGSP1 output by the voltage compensation module 11 can change to the extent that the output voltage value ELVDD0 of the first pixel power signal changes. Furthermore, by adjusting the voltage value VGMP_OUT of the first gamma reference signal VGMP1 and the voltage value VGSP_OUT of the second gamma reference signal VGSP1 to change within a suitable range following the output voltage value ELVDD0 of the first pixel power signal, the influence of the change of the output voltage value ELVDD0 of the first pixel power signal on the grayscale value actually displayed by the sub-pixel can be reduced, thereby improving the compensation effect of crosstalk.

[0147] Optionally, before generating the first gamma reference signal and the second gamma reference signal according to the first initial reference signal and the second initial reference signal, the method further includes:

[0148] An output voltage value of a first pixel power supply signal provided to the pixel circuit is obtained.

[0149] An actual voltage value of a first pixel power supply signal received by the pixel circuit is obtained.

[0150] A voltage difference between an output voltage value of the first pixel power signal and an actual voltage value of the first pixel power signal is determined.

[0151] Detal_VGMP and Detal_VGSP are determined according to the voltage difference.

[0152] Specifically, the first pixel power signal is provided by a power management chip (Power IC), wherein the wiring through which the power management chip outputs the first pixel power signal to the display panel 200 is longer, resulting in a larger resistance of the wiring, causing a correspondingly larger voltage drop (Drop) of the first pixel power signal. As a result, a larger gap exists between an actual voltage value ELVDD1 of the first pixel power signal received by the pixel circuit PX on the display panel 200 and its output voltage value ELVDD0, which can easily lead to insufficient power supply to certain areas of the display panel 200, thereby affecting the display uniformity of the display panel 200.

[0153] Based on the above technical problem, the power management chip will start the dynamic compensation of the output voltage value ELVDD0 of the first pixel power signal to maintain the display brightness of each area of ​​the display panel 200.

[0154] Specifically, according to the difference between the output voltage value ELVDD0 of the first pixel power signal and the actual voltage value ELVDD1 of the first pixel power signal received by the pixel circuit PX, the output voltage value ELVDD0 of the first pixel power signal is adjusted to compensate for the voltage drop of the first pixel power signal during the transmission process, and the power management chip outputs the adjusted voltage value so that the actual voltage value ELVDD1 of the first pixel power signal received by the pixel circuit PX can reach the originally expected output voltage value.

[0155] Further, when the output voltage value ELVDD0 of the first pixel power signal is adjusted, the voltage value VGMP_IN of the first initial reference signal VGMP0 and the voltage value VGSP_IN of the second initial reference signal VGSP0 will also dynamically change with the change of the output voltage value ELVDD0 of the first pixel power signal, so as to ensure that the voltage difference between the voltage value VGMP_IN of the first initial reference signal VGMP0 and the output voltage value ELVDD0 of the first pixel power signal remains unchanged, and the voltage difference between the voltage value VGSP_IN of the second initial reference signal VGSP0 and the output voltage value ELVDD0 of the first pixel power signal remains unchanged. In the related art, the data voltage DATA is obtained by the voltage value VGMP_IN of the first initial reference signal VGMP0 and the voltage value VGSP_IN of the second initial reference signal VGSP0. Therefore, after the voltage value VGMP_IN of the first initial reference signal VGMP0 and the voltage value VGSP_IN of the second initial reference signal VGSP0 change with the output voltage value ELVDD0 of the first pixel power supply signal, the data voltage DATA will also change accordingly, thereby affecting the grayscale value actually displayed by the sub-pixel, and further affecting the compensation effect of crosstalk.

[0156] It can be understood that the voltage value VGMP_IN of the first initial reference signal VGMP0 and the voltage value VGSP_IN of the second initial reference signal VGSP0 change with the change of the output voltage value ELVDD0 of the first pixel power signal, and the change amplitude of the voltage value VGMP_IN of the first initial reference signal VGMP0 and the voltage value VGSP_IN of the second initial reference signal VGSP0 is determined by the adjustment amplitude of the output voltage value ELVDD0 of the first pixel power signal, and the adjustment amplitude of the output voltage value ELVDD0 of the first pixel power signal is related to the voltage drop of the first pixel power signal during the transmission process (that is, the difference between the actual voltage value ELVDD1 of the first pixel power signal and its output voltage value ELVDD0).

[0157] Therefore, in this embodiment, in the debugging process before generating the first gamma reference signal VGMP1 and the second gamma reference signal VGSP1 according to the first initial reference signal VGMP0 and the second initial reference signal VGSP0, the actual voltage value ELVDD1 of the first pixel power signal received by the pixel circuit on the display panel is detected.

[0158] The voltage detection device may be electrically connected to a signal line transmitting the first pixel power signal on the display panel, so as to obtain the actual voltage value ELVDD1 of the first pixel power signal through the voltage detection device, but the present invention is not limited thereto.

[0159] Further, the actual voltage value ELVDD1 of the first pixel power signal is compared with the output voltage value ELVDD0 of the first pixel power signal output by the power management chip, and the difference ELVDD0-ELVDD1 between the output voltage value ELVDD0 of the first pixel power signal and the actual voltage value ELVDD1 of the first pixel power signal is calculated, and then the first compensation value Detal_VGMP and the second compensation value Detal_VGSP are determined according to the difference ELVDD0-ELVDD1, so that the voltage value VGMP_OUT of the first gamma reference signal VGMP1 and the voltage value VGSP_OUT of the second gamma reference signal VGSP1 output by the voltage compensation module follow the output voltage value ELVDD0 of the first pixel power signal to change within a suitable range, thereby reducing the influence of the change of the output voltage value ELVDD0 of the first pixel power signal on the grayscale value actually displayed by the sub-pixel, and improving the compensation effect of crosstalk.

[0160] Exemplarily, when the difference ELVDD0-ELVDD1 between the output voltage value ELVDD0 of the first pixel power signal and the actual voltage value ELVDD1 of the first pixel power signal is large, the voltage drop of the first pixel power signal during transmission is large, and the adjustment amplitude of the output voltage value ELVDD0 of the first pixel power signal is large. The voltage value VGMP_OUT of the first gamma reference signal VGMP1 and the voltage value VGSP_OUT of the second gamma reference signal VGSP1 will change greatly following the output voltage value ELVDD0 of the first pixel power signal, and the influence on the grayscale value actually displayed by the sub-pixel is more obvious, and the compensation effect of crosstalk is significantly deteriorated. At this time, the first compensation value Detal_VGMP and the second compensation value Detal_VGSP can be set to negative values ​​with larger absolute values ​​to reduce the voltage. The voltage value VGMP_OUT of the first gamma reference signal VGMP1 and the voltage value VGSP_OUT of the second gamma reference signal VGSP1 output by the compensation module change with the output voltage value ELVDD0 of the first pixel power signal. For example, when the output voltage value ELVDD0 of the first pixel power signal is raised by 0.1V, the voltage value VGMP_IN of the first initial reference signal VGMP0 and the voltage value VGSP_IN of the second initial reference signal VGSP0 are only raised by 0.01V, and the voltage value VGMP_OUT of the first gamma reference signal VGMP1 and the voltage value VGSP_OUT of the second gamma reference signal VGSP1 are obtained, thereby reducing the influence of the change of the output voltage value ELVDD0 of the first pixel power signal on the grayscale value actually displayed by the sub-pixel, and improving the compensation effect of crosstalk.

[0161] On the contrary, when the difference ELVDD0-ELVDD1 between the output voltage value ELVDD0 of the first pixel power signal and the actual voltage value ELVDD1 of the first pixel power signal is small, the voltage drop of the first pixel power signal during the transmission process is small, and the adjustment amplitude of the output voltage value ELVDD0 of the first pixel power signal is small. The change amount of the voltage value VGMP_OUT of the first gamma reference signal VGMP1 and the voltage value VGSP_OUT of the second gamma reference signal VGSP1 following the output voltage value ELVDD0 of the first pixel power signal will decrease, and the influence on the grayscale value actually displayed by the sub-pixel will be smaller. At this time, the first compensation value Detal_VGMP and the second compensation value Detal_VGSP can be set to values ​​with smaller absolute values ​​to ensure that the compensation of the first initial reference signal VGMP0 and the second initial reference signal VGSP0 is more accurate, and to avoid over-compensation and affecting the display effect.

[0162] Optionally, determining Detal_VGMP and Detal_VGSP according to the voltage difference includes:

[0163] When the voltage difference is greater than or equal to the first preset threshold, Detal_VGMP and Detal_VGSP are reduced.

[0164] Among them, default values ​​can be set for the first compensation value Detal_VGMP and the second compensation value Detal_VGSP, wherein the first compensation value Detal_VGMP and the second compensation value Detal_VGSP can default to 0, that is, no compensation is made to the first initial reference signal VGMP0 and the second initial reference signal VGSP0; the first compensation value Detal_VGMP and the second compensation value Detal_VGSP can also default to a positive value to reduce the size of the driving current formed by the pixel circuit, which is beneficial to improve the life of the display panel, but is not limited to this.

[0165] During the debugging process, when the difference ELVDD0-ELVDD1 between the output voltage value ELVDD0 of the first pixel power signal and the actual voltage value ELVDD1 of the first pixel power signal is small (for example, the difference ELVDD0-ELVDD1 is less than the first preset threshold), the voltage drop of the first pixel power signal during the transmission process is small, and the adjustment amplitude of the output voltage value ELVDD0 of the first pixel power signal is small. The change amount of the voltage value VGMP_OUT of the first gamma reference signal VGMP1 and the voltage value VGSP_OUT of the second gamma reference signal VGSP1 following the output voltage value ELVDD0 of the first pixel power signal will be reduced, and the influence on the grayscale value actually displayed by the sub-pixel will be small. At this time, the first compensation value Detal_VGMP and the second compensation value Detal_VGSP do not need to be adjusted to the default values, which is beneficial to improving the service life of the display panel and avoiding over-compensation that affects the display effect.

[0166] When the difference ELVDD0-ELVDD1 between the output voltage value ELVDD0 of the first pixel power signal and the actual voltage value ELVDD1 of the first pixel power signal is large (for example, the difference ELVDD0-ELVDD1 is greater than or equal to the first preset threshold), the voltage drop of the first pixel power signal during transmission is large, the adjustment range of the output voltage value ELVDD0 of the first pixel power signal is large, and the voltage value VGMP_OUT of the first gamma reference signal VGMP1 and the voltage value VGSP_OUT of the second gamma reference signal VGSP1 change greatly following the output voltage value ELVDD0 of the first pixel power signal, which has an impact on the actual voltage value ELVDD1 of the sub-pixel. The influence of the grayscale value actually displayed on the sub-pixel is more obvious, and the compensation effect of crosstalk is significantly deteriorated. At this time, the first compensation value Detal_VGMP and the second compensation value Detal_VGSP are reduced to reduce the degree to which the voltage value VGMP_OUT of the first gamma reference signal VGMP1 and the voltage value VGSP_OUT of the second gamma reference signal VGSP1 output by the voltage compensation module follow the output voltage value ELVDD0 of the first pixel power supply signal, thereby reducing the influence of the change of the output voltage value ELVDD0 of the first pixel power supply signal on the grayscale value actually displayed by the sub-pixel and improving the compensation effect of crosstalk.

[0167] The first preset threshold may be set according to the actual crosstalk compensation effect of the display panel, and the embodiment of the present invention does not specifically limit this.

[0168] Optionally, when the voltage difference is greater than or equal to the first preset threshold, the greater the voltage difference is, the smaller Detal_VGMP and Detal_VGSP are.

[0169] As mentioned above, when the difference ELVDD0-ELVDD1 between the output voltage value ELVDD0 of the first pixel power signal and the actual voltage value ELVDD1 of the first pixel power signal is larger, the voltage drop of the first pixel power signal during the transmission process is larger, the adjustment range of the output voltage value ELVDD0 of the first pixel power signal is larger, the voltage value VGMP_OUT of the first gamma reference signal VGMP1 and the voltage value VGSP_OUT of the second gamma reference signal VGSP1 follow the output voltage value ELVDD0 of the first pixel power signal. The greater the change, the greater the influence on the grayscale value actually displayed by the sub-pixel. Obviously, the worse the compensation effect of crosstalk is, the smaller the first compensation value Detal_VGMP and the second compensation value Detal_VGSP are set to be, so as to reduce the degree to which the voltage value VGMP_OUT of the first gamma reference signal VGMP1 and the voltage value VGSP_OUT of the second gamma reference signal VGSP1 output by the voltage compensation module change following the output voltage value ELVDD0 of the first pixel power signal, thereby reducing the influence of the change of the output voltage value ELVDD0 of the first pixel power signal on the grayscale value actually displayed by the sub-pixel, and improving the compensation effect of crosstalk.

[0170] It should be noted that after determining the values ​​of the first compensation value Detal_VGMP and the second compensation value Detal_VGSP during the debugging process, the first compensation value Detal_VGMP and the second compensation value Detal_VGSP can be stored in a storage module in the display device so as to be called when the display driving device drives the display panel for display.

[0171] When Detal_VGMP=aV1+b and Detal_VGSP=cV1+d, the values ​​of a, b, c and d can be stored in the storage module.

[0172] Further, when b=V1 / e, d=V1 / f, the values ​​of a, b, e and f may be stored in the storage module, but the present invention is not limited thereto.

[0173] In addition, multiple display panels may be debugged to select a public version of the first compensation value Detal_VGMP and the second compensation value Detal_VGSP.

[0174] For example, multiple display panels are debugged, and the first compensation value Detal_VGMP and the second compensation value Detal_VGSP of each display panel are averaged to obtain the public version of the first compensation value Detal_VGMP and the second compensation value Detal_VGSP. The corresponding batches of display panels all use the public version of the first compensation value Detal_VGMP and the second compensation value Detal_VGSP to improve debugging efficiency.

[0175] In other embodiments, single-chip debugging may also be performed, that is, each display panel is debugged, and the first compensation value Detal_VGMP and the second compensation value Detal_VGSP are independently set for each display panel to ensure that each display panel can achieve its optimal performance. The embodiment of the present invention does not specifically limit this.

[0176] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps described in the present invention can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solution of the present invention can be achieved, and this document does not limit this.

[0177] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A display driving device, characterized in that: include: an initial reference signal generating module, electrically connected to the first power signal terminal, and configured to generate a first initial reference signal and a second initial reference signal according to a first power signal provided by the first power signal terminal, wherein a voltage value of the first initial reference signal is greater than a voltage value of the second initial reference signal; a voltage compensation module, electrically connected to the initial reference signal generating module, and configured to generate a first gamma reference signal according to the first initial reference signal, and to generate a second gamma reference signal according to the second initial reference signal; a driving module, electrically connected to the voltage compensation module, and configured to drive the display panel to display according to the first gamma reference signal and the second gamma reference signal; Wherein, the voltage value of the first initial reference signal is VGMP_IN, the voltage value of the second initial reference signal is VGSP_IN, the voltage value of the first gamma reference signal is VGMP_OUT, and the voltage value of the second gamma reference signal is VGSP_OUT; VGMP_OUT=VGMP_IN+Detal_VGMP; VGSP_OUT=VGSP_IN+Detal_VGSP; Detal_VGMP is related to V1, V1 = ELVDD0-ELVDD1; ELVDD0 is an output voltage value of a first pixel power signal provided to a pixel circuit in the display panel, and ELVDD1 is an actual voltage value of the first pixel power signal received by the pixel circuit in the display panel.

2. The display driving device according to claim 1, characterized in that: Detal_VGMP=aV1+b; Detal_VGSP=cV1+d; a, b, c and d are all real numbers.

3. The display driving device according to claim 2, characterized in that: |a|≤1;|c|≤1.

4. The display driving device according to claim 2, characterized in that: b = V1 / e; d = V1 / f; The bit width of e is greater than the bit width of a; The bit width of f is greater than the bit width of c; Both e and f are integers.

5. The display driving device according to claim 1, characterized in that: -V1≤Detal_VGMP≤V1; -V1≤Detal_VGSP≤V1.

6. The display driving device according to claim 1, characterized in that: VGMP_OUT ≤ AVDD; VGSP_OUT≤VGMP_OUT; AVDD is the voltage value of the first power supply signal.

7. The display driving device according to claim 1, characterized in that: The voltage compensation module includes a gamma reference signal generating unit and a feedback unit; The gamma reference signal generating unit is electrically connected to the initial reference signal generating module, and is used to generate the first gamma reference signal according to the first initial reference signal, and to generate the second gamma reference signal according to the second initial reference signal; The feedback unit is electrically connected to the gamma reference signal generating unit, and is used to increase the current values ​​of the first gamma reference signal and the second gamma reference signal.

8. The display driving device according to claim 7, characterized in that: The feedback unit includes an operational amplifier.

9. The display driving device according to claim 1, characterized in that: The voltage compensation module includes a gamma reference signal generating unit, a first capacitor and a second capacitor; The gamma reference signal generating unit is electrically connected to the initial reference signal generating module, and is used to generate the first gamma reference signal according to the first initial reference signal, and to generate the second gamma reference signal according to the second initial reference signal; The gamma reference signal generating unit comprises a first output terminal and a second output terminal, the first output terminal is used to output the first gamma reference signal, and the second output terminal is used to output the second gamma reference signal; A first end of the first capacitor is electrically connected to the first output end, and a second end of the first capacitor is grounded; A first end of the second capacitor is electrically connected to the second output end, and a second end of the second capacitor is grounded.

10. A display device, characterized in that: The display driving device comprises any one of claims 1 to 9.

11. A display driving method, characterized in that: include: Acquire a first power supply signal, and generate a first initial reference signal and a second initial reference signal according to the first power supply signal, wherein a voltage value of the first initial reference signal is greater than a voltage value of the second initial reference signal; generating a first gamma reference signal and a second gamma reference signal according to the first initial reference signal and the second initial reference signal; driving a display panel to display according to the first gamma reference signal and the second gamma reference signal; Wherein, the voltage value of the first initial reference signal is VGMP_IN, the voltage value of the second initial reference signal is VGSP_IN, the voltage value of the first gamma reference signal is VGMP_OUT, and the voltage value of the second gamma reference signal is VGSP_OUT; VGMP_OUT=VGMP_IN+Detal_VGMP; VGSP_OUT=VGSP_IN+Detal_VGSP; Detal_VGMP is related to V1; V1 = ELVDD0 - ELVDD1; ELVDD0 is an output voltage value of a first pixel power signal provided to a pixel circuit in the display panel, and ELVDD1 is an actual voltage value of the first pixel power signal received by the pixel circuit in the display panel.

12. The display driving method according to claim 11, characterized in that: Before generating the first gamma reference signal and the second gamma reference signal according to the first initial reference signal and the second initial reference signal, the method further includes: Acquire an output voltage value of the first pixel power supply signal provided to the pixel circuit; Acquiring an actual voltage value of the first pixel power supply signal received by the pixel circuit; determining a voltage difference between an output voltage value of the first pixel power signal and an actual voltage value of the first pixel power signal; Detal_VGMP and Detal_VGSP are determined according to the voltage difference.

13. The display driving method according to claim 12, characterized in that: Determining Detal_VGMP and Detal_VGSP according to the voltage difference includes: When the voltage difference is greater than or equal to the first preset threshold, Detal_VGMP and Detal_VGSP are reduced.

14. The display driving method according to claim 13, characterized in that: When the voltage difference is greater than or equal to the first preset threshold, the greater the voltage difference is, the smaller Detal_VGMP and Detal_VGSP are.

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