Display driving device, display driving method, and display device

Abstract

Embodiments of the present invention disclose a display driving device, a display driving method, and a display device. The display driving device includes a reference voltage generating module, a gamma voltage generating module, and a grayscale voltage generating module. The reference voltage generating module is used to generate a first reference voltage and a second reference voltage based on a driving power supply voltage connected to a driving power supply terminal. The gamma voltage generating module is used to generate multiple gamma voltages based on the first reference voltage and the second reference voltage. The grayscale voltage generating module is used to generate grayscale voltages corresponding to multiple binding point grayscales, wherein the grayscale voltage corresponding to the lowest binding point grayscale among the binding point grayscales is equal to the driving power supply voltage, and the grayscale voltages corresponding to the remaining binding point grayscales except the lowest binding point grayscale are obtained based on the respective gamma voltages. The technical solution of the embodiment of the present invention helps to reduce the power consumption of the display driving device, improve the accuracy of the grayscale voltage, and thus improve the display effect.

Description

Technical Field

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

[0002] With the continuous development of display technology, people have higher and higher requirements for the performance of display devices. At present, existing display devices have problems such as high power consumption and poor display effects, which affect user experience. Summary of the Invention

[0003] Embodiments of the present invention provide a display driving device, a display driving method, and a display device to reduce power consumption of the display driving device and improve display effects.

[0004] In a first aspect, an embodiment of the present invention provides a display driving device, comprising:

[0005] a reference voltage generating module, connected to the driving power supply terminal, for generating a first reference voltage and a second reference voltage according to a driving power supply voltage connected to the driving power supply terminal, wherein the driving power supply voltage is greater than the first reference voltage, and the first reference voltage is greater than the second reference voltage;

[0006] a gamma voltage generating module, connected to the reference voltage generating module, and configured to generate a plurality of gamma voltages according to the first reference voltage and the second reference voltage;

[0007] A grayscale voltage generating module is connected to the driving power supply terminal and the gamma voltage generating module, and is used to generate grayscale voltages corresponding to multiple binding point grayscales, wherein the grayscale voltage corresponding to the lowest binding point grayscale among the binding point grayscales is equal to the driving power supply voltage, and the grayscale voltages corresponding to the remaining binding point grayscales except the lowest binding point grayscale are obtained based on the respective gamma voltages.

[0008] Optionally, the driving power supply voltage is a black state voltage corresponding to a black screen displayed by the display device.

[0009] Optionally, the reference voltage generating module includes a first reference voltage generating unit and a second reference voltage generating unit;

[0010] The first reference voltage generating unit is connected to the driving power supply terminal and the first reference voltage terminal, and is used to generate a first reference voltage according to the driving power supply voltage and the first reference voltage connected to the first reference voltage terminal;

[0011] The second reference voltage generating unit is connected to the driving power supply terminal and the second reference voltage terminal, and is used to generate a second reference voltage according to the driving power supply voltage and a second reference voltage connected to the second reference voltage terminal;

[0012] The driving power supply voltage is greater than the first reference voltage, and the first reference voltage is greater than the second reference voltage.

[0013] Optionally, the first reference voltage generating unit includes a first voltage buffer amplifier, and the second reference voltage generating unit includes a second voltage buffer amplifier;

[0014] a first input terminal of the first voltage buffer amplifier connected to the first reference voltage terminal, a second input terminal of the first voltage buffer amplifier connected to its own output terminal, a first power supply terminal of the first voltage buffer amplifier connected to the driving power supply terminal, a second power supply terminal of the first voltage buffer amplifier grounded, and an output terminal of the first voltage buffer amplifier providing the first reference voltage;

[0015] a first input terminal of the second voltage buffer amplifier connected to the second reference voltage terminal, a second input terminal of the second voltage buffer amplifier connected to its own output terminal, a first power supply terminal of the second voltage buffer amplifier connected to the driving power supply terminal, a second power supply terminal of the second voltage buffer amplifier grounded, and an output terminal of the second voltage buffer amplifier providing the second reference voltage;

[0016] The difference between the driving power supply voltage and the first reference voltage is greater than or equal to a preset bias voltage, and the difference between the driving power supply voltage and the second reference voltage is greater than or equal to the preset bias voltage.

[0017] Optionally, the reference voltage generating module includes a first reference voltage output terminal and a second reference voltage output terminal, and the gamma voltage generating module includes a voltage dividing circuit, and the voltage dividing circuit includes a plurality of voltage dividing resistors and a plurality of gamma voltage output terminals;

[0018] Each of the voltage-dividing resistors is connected in series between the first reference voltage output terminal and the second reference voltage output terminal, and the multiple gamma voltage output terminals are respectively located between the first reference voltage output terminal and the voltage-dividing resistor, between the second reference voltage output terminal and the voltage-dividing resistor, and between two adjacent voltage-dividing resistors. The voltage-dividing resistor is used to divide the voltage between the first reference voltage and the second reference voltage, and the gamma voltage output terminal is used to provide the gamma voltage.

[0019] Optionally, the grayscale voltage generating module includes a gating circuit and n grayscale voltage output terminals corresponding one-to-one to the n binding point grayscales;

[0020] The lowest binding point grayscale corresponds to the first grayscale voltage output terminal, and the first grayscale voltage output terminal is connected to the driving power supply terminal;

[0021] The gating circuit is connected to each gamma voltage output terminal and the second to nth grayscale voltage output terminals, and the gating circuit is used to control the grayscale voltage output terminal to be connected to the corresponding gamma voltage output terminal, so as to provide a grayscale voltage to the corresponding grayscale voltage output terminal according to the voltage of the gamma voltage output terminal.

[0022] Optionally, the binding point grayscale includes a first binding point grayscale, which is higher than the lowest binding point grayscale and lower than the remaining binding point grayscales except the lowest binding point grayscale and the first binding point grayscale, and the grayscale voltage corresponding to the first binding point grayscale is equal to the first reference voltage.

[0023] Optionally, the grayscale voltage corresponding to the highest binding point grayscale among the binding point grayscales is equal to the second reference voltage.

[0024] In a second aspect, an embodiment of the present invention provides a display driving method, including:

[0025] generating a first reference voltage and a second reference voltage according to a driving power supply voltage, wherein the driving power supply voltage is greater than the first reference voltage, and the first reference voltage is greater than the second reference voltage;

[0026] generating a plurality of gamma voltages according to the first reference voltage and the second reference voltage;

[0027] Grayscale voltages corresponding to multiple binding point grayscales are generated, wherein the grayscale voltage corresponding to the lowest binding point grayscale among the binding point grayscales is equal to the driving power supply voltage, and the grayscale voltages corresponding to the remaining binding point grayscales except the lowest binding point grayscale are obtained based on the respective gamma voltages.

[0028] In a third aspect, an embodiment of the present invention provides a display device, comprising the display driving device described in the first aspect, and further comprising a display panel.

[0029] The display driving device, display driving method and display device provided by the embodiments of the present invention generate a first reference voltage and a second reference voltage based on a driving power supply voltage. The driving power supply voltage is greater than the first reference voltage, and the first reference voltage is greater than the second reference voltage. By setting the grayscale voltage corresponding to the lowest binding point grayscale among the binding point grayscales to be equal to the driving power supply voltage, the grayscale voltages corresponding to the remaining binding point grayscales except the lowest binding point grayscale are obtained based on the various gamma voltages, that is, based on the first reference voltage, the second reference voltage and the voltage therebetween, so that the driving power supply voltage can be set to a lower voltage value to reduce the power consumption of the display driving device and reduce the cross-voltage between the first reference voltage and the second reference voltage, thereby improving the accuracy of each gamma voltage level, thereby improving the accuracy of the grayscale voltage and improving the display effect. In addition, when the lowest binding point grayscale is 0 grayscale, its corresponding grayscale voltage is the driving power supply voltage, and the difference between the driving power supply voltage and the first reference voltage is large, by adjusting the DBV instruction or performing gamma debugging to determine the grayscale voltage corresponding to 1 grayscale to 255 grayscale, the grayscale voltage corresponding to the display brightness between 0 grayscale and 1 grayscale will not be obtained, which helps to avoid problems such as uneven display and color cast caused by the light-emitting device being in a critical conduction state, thereby improving the display effect at low grayscale.

[0030] It should be understood that the content described in this section is not intended to identify the key or important features of the embodiments of the present invention, nor is it intended to limit the scope of the present invention. Other features of the present invention will become readily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] 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.

[0032] Figure 1 is a schematic structural diagram of a display device provided by an embodiment of the present invention;

[0033] Figure 2 1 is a schematic structural diagram of a display driving device provided by an embodiment of the present invention;

[0034] Figure 3 is a structural diagram of another display driving device provided by an embodiment of the present invention;

[0035] Figure 4 is a structural diagram of another display driving device provided by an embodiment of the present invention;

[0036] Figure 5is a structural diagram of another display driving device provided by an embodiment of the present invention;

[0037] Figure 6 is a structural diagram of another display driving device provided by an embodiment of the present invention;

[0038] Figure 7 is a structural diagram of another display driving device provided by an embodiment of the present invention;

[0039] Figure 8 1 is a schematic structural diagram of a gating unit provided by an embodiment of the present invention;

[0040] Figure 9 is a structural diagram of another display driving device provided by an embodiment of the present invention;

[0041] Figure 10 is a structural diagram of another display driving device provided by an embodiment of the present invention;

[0042] Figure 11 It is a flow chart of a display driving method provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0043] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions 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 embodiments described 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 making creative efforts should fall within the scope of protection of the present invention.

[0044] It should be noted that the terms "first", "second", etc. in the description 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 numbers 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 clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0045] As described in the background art, existing display devices have problems with high power consumption and poor display effects, which affect user experience. The inventors have found that the reasons for the above problems are as follows: the existing display device includes a display panel and a driver chip. The display panel includes multiple sub-pixels. The sub-pixels can be composed of light-emitting devices, such as organic light-emitting diodes (OLEDs). The driver chip obtains grayscale voltages corresponding to multiple binding point grayscales based on the driving power supply voltage, and uses the difference method to calculate the grayscale voltage corresponding to the display grayscale between the two adjacent binding point grayscales based on the grayscale voltages corresponding to the grayscale voltages corresponding to the two adjacent binding point grayscales, thereby determining the grayscale voltage corresponding to each display grayscale. The driver chip drives each light-emitting device to emit light and display according to the grayscale voltage corresponding to each display grayscale. The driving power supply voltage used by the existing driver chip is relatively large, resulting in high power consumption of the display device. The grayscale voltage obtained from the driving power supply voltage is also relatively large, resulting in a large difference between the grayscale voltages corresponding to different binding point grayscales, resulting in low accuracy of the grayscale voltage, which affects the display effect.

[0046] In addition, the display brightness level of the display device can be changed by adjusting the display brightness value (DBV) command of the display device. The DBV command corresponds to the display brightness of the maximum grayscale of the display panel. When the display brightness corresponding to the maximum grayscale of the display panel is changed, the display brightness corresponding to other grayscales will also change. When adjusting the DBV command or performing gamma adjustment in the prior art, a grayscale voltage corresponding to a display brightness between grayscale 0 and grayscale 1 may be obtained. Due to the characteristics of OLED light-emitting devices, driving the OLED light-emitting device with this grayscale voltage will cause the light-emitting device to enter a critical conduction state, thereby causing problems such as display unevenness (mura) and color cast, resulting in poor display quality at low grayscales.

[0047] In view of the above problems, an embodiment of the present invention provides a display driving device. Figure 1 It is a structural schematic diagram of a display device provided by an embodiment of the present invention. Figure 2 1 is a schematic diagram of the structure of a display driving device provided by an embodiment of the present invention. Figure 1 and Figure 2 The display driving device 100 includes a reference voltage generating module 10 , a gamma voltage generating module 20 and a grayscale voltage generating module 30 .

[0048] The reference voltage generation module 10 is connected to the driving power supply terminal, which is connected to the driving power supply voltage AVDD. The reference voltage generation module 10 is used to generate a first reference voltage VGMP and a second reference voltage VGSP based on the driving power supply voltage AVDD. The driving power supply voltage AVDD is greater than the first reference voltage VGMP, and the first reference voltage VGMP is greater than the second reference voltage VGSP. The gamma voltage generation module 20 is connected to the reference voltage generation module 10 and is used to generate multiple gamma voltages based on the first reference voltage VGMP and the second reference voltage VGSP. The grayscale voltage generation module 30 is connected to the driving power supply terminal and the gamma voltage generation module 20 and is used to generate grayscale voltages corresponding to multiple binding point grayscales. The grayscale voltage corresponding to the lowest binding point grayscale among the binding point grayscales is equal to the driving power supply voltage AVDD, and the grayscale voltages corresponding to the remaining binding point grayscales except the lowest binding point grayscale are derived based on the respective gamma voltages.

[0049] Specifically, the display device includes a display driver device 100, a display panel 200, and a gate driver module 300. The display driver device 100 can be a display driver chip (Display Driver Integrated Circuit, DDIC) or a touch and display driver integration (Touch and Display Driver Integration, TDDI) chip. The display panel 200 can include a plurality of scan lines GL extending along the row direction and a plurality of data lines DL extending along the column direction and intersecting the scan lines GL. The intersection of the scan lines GL and the data lines DL can define a plurality of pixel areas on the display panel 200. A pixel circuit PX can be provided in each pixel area. The plurality of pixel circuits PX are arranged in an array in the display panel 200.

[0050] Each pixel circuit PX may include a thin-film transistor, a storage capacitor, and a light-emitting device. The light-emitting device may be an organic light-emitting diode (OLED) or a micro-LED. The thin-film transistor includes a switching transistor and a driving transistor. When a pulsed scan signal is input to the scan line GL, the switching transistor in the pixel circuit PX connected to the scan line GL is turned on. The pixel circuit PX then receives a data voltage transmitted from the data line DL. The driving transistor in the pixel circuit PX then drives the light-emitting device to emit light at a corresponding brightness according to the data voltage.

[0051] The display driving device 100 can control the gate driving module 300 according to the received image signal, so that the gate driving module 300 transmits a scanning signal to each row of pixel circuits PX, and transmits a data voltage to each column of pixel circuits PX through the display driving device 100, so that each pixel circuit PX in the display panel 200 drives the light-emitting device to emit light row by row, so that the display panel 200 realizes the display function.

[0052] It should be noted that Figure 1 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, and the gate driving module 300 can also be integrated into the display driving device 100.

[0053] The gamma voltage generation module 20 can generate gamma voltages based on a first reference voltage VGMP and a second reference voltage VGSP, and can obtain the gamma voltages by dividing the voltage between the first reference voltage VGMP and the second reference voltage VGSP. For example, the gamma voltage generation module 20 can generate m gamma voltages, including gamma voltages VR1, VR2, VR3, ..., VRm-1, and VRm. Gamma voltage VR1 can be equal to the first reference voltage VGMP, gamma voltage VRm can be equal to the second reference voltage VGSP, and gamma voltages VR2 to VRm-1 can be voltages obtained by dividing the voltage between the first reference voltage VGMP and the second reference voltage VGSP.

[0054] By connecting the grayscale voltage output terminal corresponding to the lowest binding point grayscale among the binding point grayscales to the driving power supply terminal, the grayscale voltage corresponding to the lowest binding point grayscale can be made equal to the driving power supply voltage AVDD connected to the driving power supply terminal. The multiple binding point grayscales can be a set of pre-set display grayscales, for example, the multiple binding point grayscales can be at least a portion of the grayscales from grayscale 0 to grayscale 255. The grayscale voltage can be a voltage used to drive the light-emitting device to emit light. For example, the grayscale voltage can be a data voltage used to drive the light-emitting device to emit light, or the data voltage can be obtained by processing the grayscale voltage. The grayscale voltage generation module 30 can generate grayscale voltages corresponding to n binding point grayscales, where the i-th binding point grayscale corresponds to the grayscale voltage Vi, 1≤i≤n. That is, the grayscale voltage generation module 30 can generate grayscale voltages V1, V2, V3, ..., Vn-1, Vn. The lowest binding point grayscale is the lowest displayed grayscale among the binding point grayscales. The grayscale voltage corresponding to the lowest binding point grayscale is greater than the grayscale voltages corresponding to the remaining binding point grayscales. For example, the lowest binding point grayscale may be the first binding point grayscale, which is grayscale 0. In this case, the grayscale voltage V1 corresponding to the lowest binding point grayscale is equal to the driving power supply voltage AVDD. The remaining binding point grayscales other than the lowest binding point grayscale are the second through nth binding point grayscales. Any of the grayscale voltages V2 through Vn corresponding to the second through nth binding point grayscales can be derived based on the gamma voltages VR1 through VRm. In other words, any of the grayscale voltages V2 through Vn can be derived based on the first reference voltage VGMP, the second reference voltage VGSP, or a voltage therebetween.

[0055] Since the first reference voltage VGMP and the second reference voltage VGSP are generated based on the driving power supply voltage AVDD, the gamma voltages VR1 to VRm are generated based on the first reference voltage VGMP, the second reference voltage VGSP and the voltage therebetween, the driving power supply voltage AVDD is greater than the first reference voltage VGMP, the first reference voltage VGMP is greater than the second reference voltage VGSP, and the driving power supply voltage AVDD is greater than each gamma voltage. In this embodiment, the grayscale voltage corresponding to the lowest binding point grayscale is set as the driving power supply voltage AVDD, and the grayscale voltages corresponding to the remaining binding point grayscales are obtained based on the gamma voltages VR1 to VRm, and the grayscale voltage corresponding to the lowest binding point grayscale is greater than the grayscale voltages corresponding to the remaining binding point grayscales. Compared with a solution in which the grayscale voltage corresponding to each binding point grayscale is obtained based on the gamma voltages VR1 to VRm, the driving power supply voltage AVDD can be set lower when the grayscale voltage corresponding to the lowest binding point grayscale is the same. For example, when the grayscale voltage corresponding to the lowest binding point grayscale is 6.7V, the driving power supply voltage AVDD in this embodiment can be directly set to 6.7V. However, if the grayscale voltage corresponding to the lowest binding point grayscale is derived from the gamma voltages VR1 to VRm, that is, from the first reference voltage VGMP, the second reference voltage VGSP, and the voltage therebetween, the first reference voltage VGMP must be at least 6.7V, and the corresponding driving power supply voltage AVDD must be greater than 6.7V. In other words, the technical solution of this embodiment enables the driving power supply voltage AVDD to be set to a lower voltage value, which helps reduce power consumption of the display driver device. When the driving power supply voltage AVDD is low, the first reference voltage VGMP and the second reference voltage VGSP derived from the driving power supply voltage AVDD are also lower, which helps reduce the cross-voltage between the first reference voltage VGMP and the second reference voltage VGSP, thereby improving the accuracy of each gamma voltage step and, in turn, the accuracy of the grayscale voltage, thereby enhancing display quality.

[0056] In the case where the multiple binding point grayscales include grayscale 0 to grayscale 255, the grayscale voltage generation module 30 can directly generate grayscale voltages corresponding to grayscales 0 to grayscale 255, so as to drive the display device to display each grayscale based on the generated grayscale voltages. In the case where the multiple binding point grayscales include some grayscales from grayscale 0 to grayscale 255, calculations can be performed based on the grayscale voltages corresponding to the respective binding point grayscales to obtain the grayscale voltages corresponding to the other display grayscales from grayscale 0 to grayscale 255, excluding the binding point grayscales. For example, based on the grayscale voltages corresponding to the j-th binding point grayscale and the j+1-th binding point grayscale, an interpolation method can be used to calculate the grayscale voltages corresponding to the display grayscales between the j-th binding point grayscale and the j+1-th binding point grayscale, thereby obtaining the grayscale voltages corresponding to each display grayscale.

[0057] The lower the displayed grayscale, the higher the corresponding grayscale voltage. When the lowest binding point grayscale is grayscale 0, in this embodiment, the driving power supply voltage AVDD can be set to the grayscale voltage corresponding to grayscale 0. The grayscale voltages corresponding to the remaining binding point grayscales other than grayscale 0 need to be obtained based on the gamma voltages VR1 to VRm. The grayscale voltages corresponding to the display grayscales other than the binding point grayscales from grayscale 0 to grayscale 255 need to be calculated (for example, using interpolation) based on the grayscale voltages corresponding to the binding point grayscales. In other words, the grayscale voltages corresponding to grayscales 1 to 255 are all between the gamma voltages VR1 to VRm, that is, between the first reference voltage VGMP and the second reference voltage VGSP. Therefore, the maximum selectable grayscale voltage corresponding to each grayscale from grayscale 1 to grayscale 255 is the first reference voltage VGMP. In this embodiment, since the driving power supply voltage AVDD is the grayscale voltage corresponding to 0 grayscale, the driving power supply voltage AVDD is greater than the first reference voltage VGMP. When the difference between the driving power supply voltage AVDD and the first reference voltage VGMP is large, so that the first reference voltage VGMP is greater than the grayscale voltage corresponding to the display brightness between 0 grayscale and 1 grayscale, the grayscale voltage corresponding to 1 grayscale to 255 grayscale is determined by adjusting the DBV instruction or performing gamma debugging, and the grayscale voltage corresponding to the display brightness between 0 grayscale and 1 grayscale will not be obtained, which helps to avoid problems such as uneven display and color cast caused by the light-emitting device being in a critical conduction state, thereby improving the display effect at low grayscale.

[0058] To sum up, the technical solution of the embodiment of the present invention generates a first reference voltage and a second reference voltage based on the driving power supply voltage, the driving power supply voltage is greater than the first reference voltage, and the first reference voltage is greater than the second reference voltage. By setting the grayscale voltage corresponding to the lowest binding point grayscale in each binding point grayscale to be equal to the driving power supply voltage, the grayscale voltages corresponding to the remaining binding point grayscales except the lowest binding point grayscale are obtained based on each gamma voltage, that is, based on the first reference voltage, the second reference voltage and the voltage between the two, so that the driving power supply voltage can be set to a lower voltage value to reduce the power consumption of the display driving device and reduce the cross voltage between the first reference voltage and the second reference voltage, thereby improving the accuracy of each gamma voltage, thereby improving the accuracy of the grayscale voltage, and improving the display effect. In addition, when the lowest binding point grayscale is 0 grayscale, its corresponding grayscale voltage is the driving power supply voltage, and the difference between the driving power supply voltage and the first reference voltage is large, by adjusting the DBV instruction or performing gamma debugging to determine the grayscale voltage corresponding to 1 grayscale to 255 grayscale, the grayscale voltage corresponding to the display brightness between 0 grayscale and 1 grayscale will not be obtained, which helps to avoid problems such as uneven display and color cast caused by the light-emitting device being in a critical conduction state, thereby improving the display effect at low grayscale.

[0059] Based on the above embodiment, the driving power supply voltage AVDD can optionally be a black-state voltage corresponding to the display device displaying a black image. For example, if the lowest binding point grayscale is grayscale 0, then the grayscale voltage corresponding to grayscale 0 is the driving power supply voltage AVDD. By setting the driving power supply voltage AVDD to the black-state voltage, the display device is driven to display at this black-state voltage. This allows the display device to display a black image at grayscale 0, while also allowing the driving power supply voltage AVDD to be set to a lower voltage value. In the prior art, the driving power supply voltage AVDD is generally greater than the black-state voltage, with a voltage value of approximately 7V. This results in higher power consumption for the display driver device, and the resulting grayscale voltage is also larger, resulting in lower grayscale voltage accuracy. In this embodiment, the driving power supply voltage AVDD can be set to a black state voltage of approximately 6.7V to reduce the power consumption of the display driving device, and reduce the voltage values ​​of the first reference voltage VGMP and the second reference voltage VGSP obtained based on the driving power supply voltage AVDD, which helps to reduce the cross-voltage between the first reference voltage VGMP and the second reference voltage VGSP, thereby improving the accuracy of each level of gamma voltage, and further improving the accuracy of the grayscale voltage, so that the display effect can be improved.

[0060] Figure 3 FIG is a schematic diagram of the structure of another display driving device provided by an embodiment of the present invention. Figure 3 Optionally, the reference voltage generation module 10 includes a first reference voltage generation unit 110 and a second reference voltage generation unit 120. The first reference voltage generation unit 110 is connected to the driving power supply terminal and the first reference voltage terminal, the first reference voltage terminal is connected to the first reference voltage VGMP', and the first reference voltage generation unit 110 is used to generate the first reference voltage VGMP according to the driving power supply voltage AVDD and the first reference voltage VGMP'. The second reference voltage generation unit 120 is connected to the driving power supply terminal and the second reference voltage terminal, the second reference voltage terminal is connected to the second reference voltage VGSP', and the second reference voltage generation unit 120 is used to generate the second reference voltage VGSP according to the driving power supply voltage AVDD and the second reference voltage VGSP'. The driving power supply voltage AVDD is greater than the first reference voltage VGMP', and the first reference voltage VGMP' is greater than the second reference voltage VGSP'.

[0061] In one embodiment, the first reference voltage generating unit 110 can be configured to amplify the driving capability of a first reference voltage signal (the first reference voltage signal represents the voltage signal corresponding to the first reference voltage VGMP', the same below) under the driving of the driving power supply voltage AVDD to obtain a first reference voltage signal, and the first reference voltage VGMP' and the first reference voltage VGMP are of the same magnitude. The second reference voltage generating unit 120 can be configured to amplify the driving capability of a second reference voltage signal (the second reference voltage signal represents the voltage signal corresponding to the second reference voltage VGSP', the same below) under the driving of the driving power supply voltage AVDD to obtain a second reference voltage signal, and the second reference voltage VGSP' and the second reference voltage VGSP are of the same magnitude. By setting the driving power supply voltage AVDD to be greater than the first reference voltage VGMP' and the first reference voltage VGMP' to be greater than the second reference voltage VGSP', the driving power supply voltage AVDD is greater than the first reference voltage VGMP, and the first reference voltage VGMP is greater than the second reference voltage VGSP. In this way, the first reference voltage VGMP can be generated by the first reference voltage generating unit 110, and the second reference voltage VGSP can be generated by the second reference voltage generating unit 120, so as to control the magnitudes of the first reference voltage VGMP and the second reference voltage VGSP respectively, and improve the driving capabilities of the first reference voltage signal and the second reference voltage signal.

[0062] Figure 4 FIG is a schematic diagram of the structure of another display driving device provided by an embodiment of the present invention. Figure 4 Based on the above embodiment, optionally, the first reference voltage generating unit 110 includes a first voltage buffer amplifier OP1, and the second reference voltage generating unit 120 includes a second voltage buffer amplifier OP2. The first input terminal of the first voltage buffer amplifier OP1 is connected to the first reference voltage terminal, the second input terminal of the first voltage buffer amplifier OP1 is connected to its own output terminal, the first power terminal of the first voltage buffer amplifier OP1 is connected to the driving power terminal, the second power terminal of the first voltage buffer amplifier OP1 is grounded, and the output terminal of the first voltage buffer amplifier OP1 provides the first reference voltage VGMP. The first input terminal of the second voltage buffer amplifier OP2 is connected to the second reference voltage terminal, the second input terminal of the second voltage buffer amplifier OP2 is connected to its own output terminal, the first power terminal of the second voltage buffer amplifier OP2 is connected to the driving power terminal, the second power terminal of the second voltage buffer amplifier OP2 is grounded, and the output terminal of the second voltage buffer amplifier OP2 provides the second reference voltage VGSP. The difference between the driving power voltage AVDD and the first reference voltage VGMP is greater than or equal to a preset bias voltage, and the difference between the driving power voltage AVDD and the second reference voltage VGSP is greater than or equal to the preset bias voltage.

[0063] Specifically, a voltage buffer amplifier, also known as a drive capability amplifier or voltage follower, has a voltage gain of 1, implementing the function of a unity-gain buffer. The output voltage of the voltage buffer amplifier can follow or track the input voltage, but it can provide a large current gain, thereby providing power gain, thereby improving the drive capability of the output signal while maintaining the voltage value of the input signal unchanged. The first voltage buffer amplifier OP1, driven by the drive power supply voltage AVDD, can amplify the drive capability of a first reference voltage signal to obtain a first reference voltage signal, where the first reference voltage VGMP' is of equal magnitude to the first reference voltage VGMP. The second voltage buffer amplifier OP2, driven by the drive power supply voltage AVDD, can amplify the drive capability of a second reference voltage signal to obtain a second reference voltage signal, where the second reference voltage VGSP' is of equal magnitude to the second reference voltage VGSP. According to the operating principle of the voltage buffer amplifier, in order to drive the first voltage buffer amplifier OP1 and the second voltage buffer amplifier OP2 to operate, it is necessary to set the difference between the voltage value of the first power supply terminal and the voltage value of the first input terminal (or output terminal) of the first voltage buffer amplifier OP1 and the second voltage buffer amplifier OP2 to be greater than or equal to a preset bias voltage. The specific value of the preset bias voltage can be determined based on the structure of the first voltage buffer amplifier OP1 and the second voltage buffer amplifier OP2.

[0064] For example, when the preset bias voltage is 0.3V, AVDD-VGMP≥0.3V and AVDD-VGSP≥0.3V should be satisfied. Based on this, the lowest binding point grayscale can be set to 0 grayscale. The grayscale voltage corresponding to 0 grayscale is equal to the driving power supply voltage AVDD. The driving power supply voltage AVDD is a black state voltage of 6.7V. The first reference voltage VGMP is 6.4V, and the second reference voltage VGSP is 2V. Then VGMP-VGSP=4.4V. In the prior art, the driving power supply voltage is generally set to 7V. The high voltage of the reference voltage derived from the driving power supply voltage is 6.7V, and the low voltage is 2V. The cross-voltage of the reference voltage is 4.7V. As can be seen, compared to the prior art, the technical solution of the embodiments of the present invention reduces the driving power supply voltage AVDD by 0.3V by setting the grayscale voltage corresponding to the lowest binding point grayscale equal to the driving power supply voltage AVDD. This reduces the voltage of the driving power supply voltage AVDD by 0.3V, thereby reducing the cross-voltage between the first reference voltage VGMP and the second reference voltage VGSP by 0.3V, thereby improving the accuracy of each gamma voltage. Furthermore, because the driving power supply voltage AVDD is the black state voltage of grayscale 0, and the difference between the driving power supply voltage AVDD and the first reference voltage VGMP is at least 0.3V, the grayscale voltage derived from the first reference voltage VGMP, the second reference voltage VGSP, and the voltage therebetween does not cause the light-emitting device to display a brightness between grayscale 0 and grayscale 1. This helps avoid problems such as display unevenness and color cast caused by the light-emitting device being in a critical conduction state, thereby improving the display quality at low grayscales.

[0065] Continue to see Figure 4 Furthermore, the first reference voltage generating unit 110 further includes a first digital-to-analog conversion unit 111. The output terminal of the first digital-to-analog conversion unit 111 serves as a first reference voltage terminal. The first digital-to-analog conversion unit 111 is configured to perform digital-to-analog conversion on a signal inputted from its input terminal and output the result. The second reference voltage generating unit 120 further includes a second digital-to-analog conversion unit 112. The output terminal of the second digital-to-analog conversion unit 112 serves as a second reference voltage terminal. The second digital-to-analog conversion unit 112 is configured to perform digital-to-analog conversion on a signal inputted from its input terminal and output the result.

[0066] In one embodiment, the first digital-to-analog conversion unit 111 and the second reference voltage generating unit 120 may both be digital-to-analog converters (DACs). The first digital-to-analog conversion unit 111 receives a first reference voltage signal in the form of a digital signal at its input, and the first digital-to-analog conversion unit 111 may convert the first reference voltage signal into an analog signal and output the signal. The second digital-to-analog conversion unit 112 receives a second reference voltage signal in the form of a digital signal at its input, and the second digital-to-analog conversion unit 112 may convert the second reference voltage signal into an analog signal and output the signal.

[0067] Figure 5FIG is a schematic diagram of the structure of another display driving device provided by an embodiment of the present invention. Figure 5 Optionally, the reference voltage generation module 10 includes a first reference voltage output terminal and a second reference voltage output terminal, the first reference voltage output terminal is used to output the first reference voltage VGMP, and the second reference voltage output terminal is used to output the second reference voltage VGSP. The gamma voltage generation module 20 includes a voltage divider circuit, which includes multiple voltage divider resistors R and multiple gamma voltage output terminals. Each voltage divider resistor R is connected in series between the first reference voltage output terminal and the second reference voltage output terminal, and the multiple gamma voltage output terminals are respectively located between the first reference voltage output terminal and the voltage divider resistor R, between the second reference voltage output terminal and the voltage divider resistor R, and between two adjacent voltage divider resistors R. The voltage divider resistor R is used to divide the voltage between the first reference voltage VGMP and the second reference voltage VGSP, and the gamma voltage output terminal is used to provide gamma voltage.

[0068] Exemplarily, the number of voltage-dividing resistors R is m-1, and the number of gamma voltage output terminals is m. The gamma voltage output terminal between the first reference voltage output terminal and the first voltage-dividing resistor R provides a gamma voltage VR1, and VR1=VGMP, the gamma voltage output terminal between the kth and k+1th voltage-dividing resistors R provides a gamma voltage VRk, 2≤k≤m-2, and the gamma voltage output terminal between the second reference voltage output terminal and the m-1th voltage-dividing resistor R provides a gamma voltage VRm, and VRm=VGSP.

[0069] Figure 6 FIG is a schematic diagram of the structure of another display driving device provided by an embodiment of the present invention. Figure 6 Optionally, the grayscale voltage generation module 30 includes a gating circuit 310 and n grayscale voltage output terminals corresponding one-to-one to the n binding point grayscales. The lowest binding point grayscale corresponds to the first grayscale voltage output terminal, which is connected to the driving power supply terminal. The gating circuit 310 connects each gamma voltage output terminal and the second to nth grayscale voltage output terminals. The gating circuit 310 is configured to control the connection between the grayscale voltage output terminals and the corresponding gamma voltage output terminals, thereby providing a grayscale voltage to the corresponding grayscale voltage output terminal based on the voltage of the gamma voltage output terminal.

[0070] For example, the gating circuit 310 can control the connection or disconnection between the ath gamma voltage output terminal of the gamma voltage generating module 20 and the bth grayscale voltage output terminal of the grayscale voltage generating module 30, where 1≤a≤m and 2≤b≤n, so that the gamma voltage output by the ath gamma voltage output terminal is provided to the bth grayscale voltage output terminal as the grayscale voltage corresponding to the bth binding point grayscale. By controlling each grayscale voltage output terminal to connect with the corresponding gamma voltage output terminal, the gating circuit 310 can connect n grayscale voltage output terminals to n gamma voltage output terminals in a one-to-one correspondence, so that n gamma voltages are selected from the gamma voltages output by the m gamma voltage output terminals as the grayscale voltages of the n grayscale voltage output terminals.

[0071] Figure 7 FIG is a schematic diagram of the structure of another display driving device provided by an embodiment of the present invention. Figure 7 In one embodiment, the gating circuit 310 may include n-1 gating units 311 corresponding to the second to nth grayscale voltage output terminals, and each gating unit 311 is connected to each gamma voltage output terminal and the corresponding grayscale voltage output terminal ( Figure 7 (The connection between each gamma voltage output terminal and each gamma voltage output terminal is not specifically shown.) The gamma voltage output terminal 311 is used to control the connection between the corresponding grayscale voltage output terminal and any gamma voltage output terminal, thereby providing a grayscale voltage to the corresponding grayscale voltage output terminal based on the voltage of each gamma voltage output terminal. Each gamma voltage output terminal 311 may include a plurality of switches connected to the conductive path between each gamma voltage output terminal and the corresponding grayscale voltage output terminal to control the connection or disconnection between each gamma voltage output terminal and the corresponding grayscale voltage output terminal, thereby providing the gamma voltage output by any gamma voltage output terminal to the corresponding grayscale voltage output terminal.

[0072] Figure 8 It is a structural diagram of a gating unit provided by an embodiment of the present invention. Figure 8 Taking the example of the gamma voltage generating module 20 including 7 voltage dividing resistors R, a specific structure of the gating unit 311 corresponding to the b-th grayscale voltage output terminal is schematically shown. Figure 7 and Figure 8For example, when the gamma voltage generating module 20 includes seven voltage-dividing resistors R, the number of gamma voltage output terminals is eight. The gating unit 311 can be configured to include a first switch K1, a second switch K2, a third switch K3, a fourth switch K4, a fifth switch K5, and a sixth switch K6. By providing a first control signal d1 to the control terminal of the first switch K1, a first control signal d2 to the control terminal of the second switch K2, a first control signal d3 to the control terminal of the third switch K3, a first control signal d4 to the control terminal of the fourth switch K4, a first control signal d5 to the control terminal of the fifth switch K5, and a first control signal d6 to the control terminal of the sixth switch K6, the on and off of each switch can be controlled, thereby providing any of the gamma voltages VR1 to VR8 to the corresponding bth grayscale voltage output terminal of the gating unit 311 as the grayscale voltage corresponding to the bth binding point grayscale, where 2≤b≤n.

[0073] Combine Figure 7 and Figure 8 Furthermore, the grayscale voltage generation module 30 also includes n-1 third voltage buffer amplifiers OP3, which are arranged in a one-to-one correspondence with the second to nth grayscale voltage output terminals. The bth third voltage buffer amplifier OP3 is connected between the bth grayscale voltage output terminal and the bth selection unit 311, where 2≤b≤n. The third voltage buffer amplifier OP3 is used to amplify the driving capability of the output signal of the selection unit 311 and provide it to the corresponding grayscale voltage output terminal. The specific structure of the third voltage buffer amplifier OP3 can be the same as that of the first voltage buffer amplifier OP1 and the second voltage buffer amplifier OP2. The third voltage buffer amplifier OP3 also includes a first input terminal, a second input terminal, a first power supply terminal, a second power supply terminal, and an output terminal. The first input terminal of the third voltage buffer amplifier OP3 is connected to the corresponding selection unit 311, and the output terminal of the third voltage buffer amplifier OP3 is connected to the corresponding grayscale voltage output terminal. The first power supply terminal of the third voltage buffer amplifier OP3 is connected to the power supply voltage, and the second input terminal of the third voltage buffer amplifier OP3 is connected to the output terminal. For the specific structure, please refer to Figure 7 Understand.

[0074] Figure 9 FIG is a schematic diagram of the structure of another display driving device provided by an embodiment of the present invention. Figure 9 On the basis of the above embodiments, optionally, the binding point grayscale includes a first binding point grayscale, the first binding point grayscale is higher than the lowest binding point grayscale, and lower than the remaining binding point grayscales except the lowest binding point grayscale and the first binding point grayscale, and the grayscale voltage corresponding to the first binding point grayscale is equal to the first reference voltage VGMP.

[0075] Exemplarily, the number of binding point grayscales is n, and the grayscale voltage generation module 30 includes n grayscale voltage output terminals corresponding one-to-one to the n binding point grayscales. The first to nth binding point grayscales sequentially increase from low grayscale to high grayscale, with the first binding point grayscale being the lowest binding point grayscale and the second binding point grayscale being the first binding point grayscale. The grayscale voltage output terminal corresponding to the second binding point grayscale in the grayscale voltage generation module 30 can be connected to the first reference voltage output terminal of the reference voltage generation module 10, so that the first reference voltage VGMP is directly provided to the grayscale voltage output terminal corresponding to the second binding point grayscale as the grayscale voltage V2 corresponding to the first binding point grayscale.

[0076] In one embodiment, the first binding point grayscale can be grayscale 0, and the second binding point grayscale can be grayscale 1. By setting the grayscale voltage corresponding to the second binding point grayscale, i.e., grayscale 1, to be equal to the first reference voltage VGMP, it is helpful to reduce the first reference voltage VGMP, thereby reducing the cross-voltage between the first reference voltage VGMP and the second reference voltage VGSP. Specifically, when performing gamma debugging on the display device, the display device can be driven to display by a first preset grayscale voltage. According to whether the actual brightness of the display device can reach the target brightness corresponding to grayscale 1, the magnitude of the first preset grayscale voltage is adjusted, and the first preset grayscale voltage corresponding to the actual brightness of the display device reaching the target brightness is set to the first reference voltage VGMP, and the grayscale voltage corresponding to the first binding point grayscale (i.e., grayscale 1) is set to be equal to the first reference voltage VGMP. Conventional display devices generally generate grayscale voltages based on the high and low voltages of a reference voltage. The high voltage of the reference voltage is typically greater than the grayscale voltage corresponding to grayscale 1, or even greater than the grayscale voltage corresponding to grayscale 0. This results in a larger value for the high voltage of the reference voltage, causing a larger crossover voltage between the high and low voltages of the reference voltage, thus affecting the accuracy of the grayscale voltages. Compared to the prior art, this embodiment adjusts the first reference voltage VGMP based on the display brightness corresponding to grayscale 1 and sets the grayscale voltage corresponding to grayscale 1 equal to the first reference voltage VGMP. This reduces the voltage value of the first reference voltage VGMP, helping to reduce the crossover voltage between the first reference voltage VGMP and the second reference voltage VGSP, thereby improving the accuracy of each gamma voltage level and, in turn, the accuracy of the grayscale voltages, resulting in an improved display quality.

[0077] Figure 10 FIG is a schematic diagram of the structure of another display driving device provided by an embodiment of the present invention. Figure 10 On the basis of the above embodiments, optionally, the grayscale voltage corresponding to the highest binding point grayscale among the binding point grayscales is equal to the second reference voltage VGSP.

[0078] Exemplarily, the nth binding point grayscale is the highest binding point grayscale, and the grayscale voltage output terminal corresponding to the nth binding point grayscale in the grayscale voltage generating module 30 can be set to be connected to the second reference voltage output terminal of the reference voltage generating module 10, so as to directly provide the second reference voltage VGSP to the grayscale voltage output terminal corresponding to the nth binding point grayscale as the grayscale voltage Vn corresponding to the highest binding point grayscale.

[0079] In one embodiment, the nth tie point grayscale can be grayscale 255. Setting the grayscale voltage corresponding to the nth tie point grayscale, i.e., grayscale 255, equal to the second reference voltage VGSP helps increase the second reference voltage VGSP, thereby reducing the crossover voltage between the first reference voltage VGMP and the second reference voltage VGSP. Specifically, when performing gamma adjustment on a display device, the display device can be driven by a second preset grayscale voltage for display. The magnitude of the second preset grayscale voltage is adjusted based on whether the actual brightness of the display device can reach the target brightness corresponding to grayscale 255. The second preset grayscale voltage corresponding to the actual brightness of the display device reaching the target brightness is set as the second reference voltage VGSP, and the grayscale voltage corresponding to the highest tie point grayscale (i.e., grayscale 255) is set equal to the second reference voltage VGSP. The low voltage of the reference voltage used in existing display devices is generally less than the grayscale voltage corresponding to grayscale 255, resulting in a smaller value of the low voltage in the reference voltage, causing a larger crossover voltage between the high voltage and the low voltage in the reference voltage, thereby affecting the accuracy of the grayscale voltage. Compared with the prior art, this embodiment adjusts the second reference voltage VGSP according to the display brightness corresponding to 255 grayscales, and sets the grayscale voltage corresponding to the highest binding point grayscale equal to the second reference voltage VGSP, so that the voltage value of the second reference voltage VGSP can be increased, which helps to reduce the cross-voltage between the first reference voltage VGMP and the second reference voltage VGSP, thereby improving the accuracy of each gamma voltage, and then improving the accuracy of the grayscale voltage, so that the display effect can be improved.

[0080] The embodiment of the present invention further provides a display device, comprising a display panel and a display driver device in any of the above embodiments, and thus having the corresponding functional structure and beneficial effects of the display driver device, which will not be described in detail here. Among them, the display panel can specifically be an OLED display panel or a Micro-LED display panel, etc. The display device can be a mobile phone, or it can be any electronic product with a display function, including but not limited to the following categories: televisions, laptops, desktop monitors, tablet computers, digital cameras, smart bracelets, smart glasses, car displays, medical equipment, industrial control equipment, touch interactive terminals, etc., and the embodiment of the present invention does not specifically limit this.

[0081] An embodiment of the present invention further provides a display driving method, which can be executed by the display driving device in any of the above embodiments. Figure 11 FIG is a flow chart of a display driving method provided by an embodiment of the present invention. Figure 11 , the method specifically comprises the following steps:

[0082] S110 , generating a first reference voltage and a second reference voltage according to a driving power supply voltage, wherein the driving power supply voltage is greater than the first reference voltage, and the first reference voltage is greater than the second reference voltage.

[0083] S120 , generating a plurality of gamma voltages according to the first reference voltage and the second reference voltage.

[0084] S130 , generating grayscale voltages corresponding to multiple binding point grayscales, wherein the grayscale voltage corresponding to the lowest binding point grayscale among the binding point grayscales is equal to the driving power supply voltage, and the grayscale voltages corresponding to the remaining binding point grayscales except the lowest binding point grayscale are obtained based on the respective gamma voltages.

[0085] The technical solution of the embodiment of the present invention generates a first reference voltage and a second reference voltage based on a driving power supply voltage, wherein the driving power supply voltage is greater than the first reference voltage, and the first reference voltage is greater than the second reference voltage. By setting the grayscale voltage corresponding to the lowest binding point grayscale among each binding point grayscale to be equal to the driving power supply voltage, the grayscale voltages corresponding to the remaining binding point grayscales except the lowest binding point grayscale are obtained based on each gamma voltage, that is, based on the first reference voltage, the second reference voltage and the voltage therebetween, so that the driving power supply voltage can be set to a lower voltage value to reduce the power consumption of the display driving device and reduce the cross-voltage between the first reference voltage and the second reference voltage, thereby improving the accuracy of each gamma voltage, thereby improving the accuracy of the grayscale voltage, and improving the display effect. In addition, when the lowest binding point grayscale is 0 grayscale, its corresponding grayscale voltage is the driving power supply voltage, and the difference between the driving power supply voltage and the first reference voltage is large, by adjusting the DBV instruction or performing gamma debugging to determine the grayscale voltage corresponding to 1 grayscale to 255 grayscale, the grayscale voltage corresponding to the display brightness between 0 grayscale and 1 grayscale will not be obtained, which helps to avoid problems such as uneven display and color cast caused by the light-emitting device being in a critical conduction state, thereby improving the display effect at low grayscale.

[0086] It should be understood that the various forms of the processes shown above can be used to reorder, add, or delete steps. For example, the steps described in the present invention can be performed in parallel, sequentially, or in a different order, as long as the desired results of the technical solution of the present invention can be achieved. This is not limited herein.

[0087] The above specific embodiments do not limit the scope of protection of the present invention. Those skilled in the art will appreciate that various modifications, combinations, sub-combinations, and substitutions may be made based on design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention are intended to be included within the scope of protection of the present invention.

Claims

1. A display driving device, characterized in that: include: a reference voltage generating module, connected to the driving power supply terminal, for generating a first reference voltage and a second reference voltage according to a driving power supply voltage connected to the driving power supply terminal, wherein the driving power supply voltage is greater than the first reference voltage, and the first reference voltage is greater than the second reference voltage; a gamma voltage generating module, connected to the reference voltage generating module, and configured to generate a plurality of gamma voltages according to the first reference voltage and the second reference voltage; a grayscale voltage generating module connected to the driving power supply terminal and the gamma voltage generating module, configured to generate grayscale voltages corresponding to a plurality of binding point grayscales, wherein the grayscale voltage corresponding to the lowest binding point grayscale among the binding point grayscales is equal to the driving power supply voltage, and the grayscale voltages corresponding to the remaining binding point grayscales except the lowest binding point grayscale are obtained based on the respective gamma voltages; The grayscale voltage generating module includes a gating circuit and n grayscale voltage output terminals corresponding one-to-one to the n binding point grayscales; The lowest binding point grayscale corresponds to the first grayscale voltage output terminal, and the first grayscale voltage output terminal is connected to the driving power supply terminal; The gating circuit is connected to each gamma voltage output terminal and the second to nth grayscale voltage output terminals, and the gating circuit is used to control the grayscale voltage output terminal to be connected to the corresponding gamma voltage output terminal, so as to provide a grayscale voltage to the corresponding grayscale voltage output terminal according to the voltage of the gamma voltage output terminal.

2. The display driving device according to claim 1, wherein: The driving power supply voltage is a black state voltage corresponding to the display device displaying a black picture.

3. The display driving device according to claim 1, wherein: The reference voltage generating module includes a first reference voltage generating unit and a second reference voltage generating unit; The first reference voltage generating unit is connected to the driving power supply terminal and the first reference voltage terminal, and is used to generate a first reference voltage according to the driving power supply voltage and the first reference voltage connected to the first reference voltage terminal; The second reference voltage generating unit is connected to the driving power supply terminal and the second reference voltage terminal, and is used to generate a second reference voltage according to the driving power supply voltage and a second reference voltage connected to the second reference voltage terminal; The driving power supply voltage is greater than the first reference voltage, and the first reference voltage is greater than the second reference voltage.

4. The display driving device according to claim 3, wherein: The first reference voltage generating unit includes a first voltage buffer amplifier, and the second reference voltage generating unit includes a second voltage buffer amplifier; a first input terminal of the first voltage buffer amplifier connected to the first reference voltage terminal, a second input terminal of the first voltage buffer amplifier connected to its own output terminal, a first power supply terminal of the first voltage buffer amplifier connected to the driving power supply terminal, a second power supply terminal of the first voltage buffer amplifier grounded, and an output terminal of the first voltage buffer amplifier providing the first reference voltage; a first input terminal of the second voltage buffer amplifier connected to the second reference voltage terminal, a second input terminal of the second voltage buffer amplifier connected to its own output terminal, a first power supply terminal of the second voltage buffer amplifier connected to the driving power supply terminal, a second power supply terminal of the second voltage buffer amplifier grounded, and an output terminal of the second voltage buffer amplifier providing the second reference voltage; The difference between the driving power supply voltage and the first reference voltage is greater than or equal to a preset bias voltage, and the difference between the driving power supply voltage and the second reference voltage is greater than or equal to the preset bias voltage.

5. The display driving device according to claim 1, wherein: The reference voltage generating module includes a first reference voltage output terminal and a second reference voltage output terminal, and the gamma voltage generating module includes a voltage dividing circuit, and the voltage dividing circuit includes a plurality of voltage dividing resistors and a plurality of gamma voltage output terminals; Each of the voltage-dividing resistors is connected in series between the first reference voltage output terminal and the second reference voltage output terminal, and the multiple gamma voltage output terminals are respectively located between the first reference voltage output terminal and the voltage-dividing resistor, between the second reference voltage output terminal and the voltage-dividing resistor, and between two adjacent voltage-dividing resistors. The voltage-dividing resistor is used to divide the voltage between the first reference voltage and the second reference voltage, and the gamma voltage output terminal is used to provide the gamma voltage.

6. The display driving device according to claim 1, wherein: The binding point grayscale includes a first binding point grayscale, which is higher than the lowest binding point grayscale and lower than the remaining binding point grayscales except the lowest binding point grayscale and the first binding point grayscale, and the grayscale voltage corresponding to the first binding point grayscale is equal to the first reference voltage.

7. The display driving device according to any one of claims 1 to 6, wherein: The grayscale voltage corresponding to the highest binding point grayscale among the binding point grayscales is equal to the second reference voltage.

8. A display driving method, applicable to the display driving device according to any one of claims 1 to 7, characterized in that: include: generating a first reference voltage and a second reference voltage according to a driving power supply voltage, wherein the driving power supply voltage is greater than the first reference voltage, and the first reference voltage is greater than the second reference voltage; generating a plurality of gamma voltages according to the first reference voltage and the second reference voltage; Grayscale voltages corresponding to multiple binding point grayscales are generated, wherein the grayscale voltage corresponding to the lowest binding point grayscale among the binding point grayscales is equal to the driving power supply voltage, and the grayscale voltages corresponding to the remaining binding point grayscales except the lowest binding point grayscale are obtained based on the respective gamma voltages.

9. A display device, characterized in that: The display driving device comprises the display driving device according to any one of claims 1 to 7, and further comprises a display panel.

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