Display driving apparatus, display driving method, and display apparatus

Abstract

This invention discloses a display driving device, a display driving method, and a display device. The display driving device includes a reference voltage generation module and a grayscale voltage generation module. The reference voltage generation module generates a first reference voltage and a second reference voltage based on a power supply voltage input from a power supply voltage terminal. The first reference voltage is greater than the second reference voltage, the difference between the power supply voltage and the second reference voltage is greater than or equal to a preset difference, and the difference between the power supply voltage and the first reference voltage is less than the preset difference. The grayscale voltage generation module generates grayscale voltages corresponding to at least one bound point grayscale level in a bound point grayscale group based on the first and second reference voltages, and generates grayscale voltages corresponding to the remaining bound point grayscale levels in the bound point grayscale group based on the second and third reference voltages. The technical solution of this invention helps to reduce the power consumption of the display device, extend the standby time of the display device, and simultaneously help to ensure display effect.

Description

Technical Field

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

[0002] With the continuous development of display technology, people have increasingly higher requirements for the performance of display devices. Currently, existing display devices suffer from high power consumption, resulting in short standby times and impacting user experience. Summary of the Invention

[0003] This invention provides a display driving device, a display driving method, and a display device to reduce the power consumption of the display device, extend the standby time of the display device, and help ensure the display effect.

[0004] In a first aspect, embodiments of the present invention provide a display driving device, comprising:

[0005] A reference voltage generation module is connected to a power supply voltage terminal and is used to generate a first reference voltage and a second reference voltage based on the power supply voltage input to the power supply voltage terminal. The first reference voltage is greater than the second reference voltage, the difference between the power supply voltage and the second reference voltage is greater than or equal to a preset difference, and the difference between the power supply voltage and the first reference voltage is less than the preset difference.

[0006] A grayscale voltage generation module is connected to the reference voltage generation module and a third reference voltage terminal. The third reference voltage input to the third reference voltage terminal is less than the second reference voltage. The grayscale voltage generation module is used to generate grayscale voltages corresponding to at least one binding point grayscale in the binding point grayscale group based on the first reference voltage and the second reference voltage, and to generate grayscale voltages corresponding to the remaining binding point grayscales in the binding point grayscale group based on the second reference voltage and the third reference voltage.

[0007] Optionally, the grayscale group of binding points includes n grayscale levels of binding points, and the grayscale voltage corresponding to the first to the nth grayscale levels of binding points decreases sequentially. The grayscale voltage generation module generates the grayscale voltage corresponding to the first i grayscale levels of binding points based on the first reference voltage and the second reference voltage, and generates the grayscale voltage corresponding to the (i+1)th to the nth grayscale levels of binding points based on the second reference voltage and the third reference voltage, where 1 ≤ i < n; preferably, i = 1.

[0008] Preferably, the gray level of the first binding point is the lowest gray level.

[0009] Optionally, the magnitude of the second reference voltage is related to the grayscale voltage corresponding to the (i+1)th grayscale of the binding point under the preset display brightness level, and the magnitude of the first reference voltage is related to the grayscale voltage corresponding to the first grayscale of the binding point under the preset display brightness level; wherein, the grayscale voltage corresponding to the first grayscale of the binding point under the preset display brightness level is the maximum grayscale voltage.

[0010] Preferably, the grayscale voltage corresponding to the first grayscale of the binding point under the preset display brightness level is equal to the sum of the grayscale voltage adjustment value corresponding to the (i+1)th grayscale of the binding point under the preset display brightness level and the preset voltage value;

[0011] Preferably, the power supply voltage is equal to the sum of the second reference voltage and the preset difference.

[0012] Optionally, the reference voltage generation module includes:

[0013] The first reference voltage generation unit is connected to the reference voltage terminal, the power supply voltage terminal, and the grayscale voltage generation module. It is used to convert the reference voltage input to the reference voltage terminal according to the power supply voltage to obtain the first reference voltage.

[0014] The second reference voltage generation unit is connected to the reference voltage terminal, the power supply voltage terminal, and the grayscale voltage generation module. It is used to convert the reference voltage according to the power supply voltage to obtain the second reference voltage.

[0015] Optionally, the first reference voltage generation unit includes a first boost circuit, a first resistor, and a second resistor;

[0016] The first input terminal of the first boost circuit is connected to the reference voltage terminal, the second input terminal of the first boost circuit is connected to the first terminal of the first resistor and the first terminal of the second resistor, the first power supply terminal of the first boost circuit is connected to the power supply voltage terminal, the output terminal of the first boost circuit serves as the first reference voltage output terminal, the second terminal of the first resistor is connected to the output terminal of the first boost circuit, and the second power supply terminal of the first boost circuit and the second terminal of the second resistor are grounded. The first boost circuit is used to boost the reference voltage according to the power supply voltage to obtain the first reference voltage.

[0017] Optionally, the second reference voltage generation unit includes a second boost circuit, a third resistor, and a fourth resistor;

[0018] The first input terminal of the second boost circuit is connected to the reference voltage terminal, the second input terminal of the second boost circuit is connected to the first terminals of the third resistor and the fourth resistor, the first power supply terminal of the second boost circuit is connected to the power supply voltage terminal, the output terminal of the second boost circuit serves as the second reference voltage output terminal, the second terminal of the third resistor is connected to the output terminal of the second boost circuit, and the second power supply terminal of the second boost circuit and the second terminal of the fourth resistor are grounded. The second boost circuit is used to boost the reference voltage according to the power supply voltage to obtain the second reference voltage.

[0019] Optionally, the grayscale voltage generation module includes:

[0020] The first voltage divider circuit is connected to the first reference voltage output terminal and the second reference voltage output terminal of the reference voltage generation module. It is used to divide the voltage between the first reference voltage and the second reference voltage to obtain the gray level voltage corresponding to at least one of the binding point gray levels in the binding point gray level group.

[0021] The second voltage divider circuit is connected to the output terminal of the second reference voltage and the third reference voltage, and is used to divide the voltage between the second reference voltage and the third reference voltage to obtain the gray level voltage corresponding to the remaining gray levels in the gray level group of the binding points.

[0022] Preferably, the first voltage divider circuit includes a plurality of voltage divider resistors connected in series between the first reference voltage output terminal and the second reference voltage output terminal, and the second voltage divider circuit includes a plurality of voltage divider resistors connected in series between the second reference voltage output terminal and the third reference voltage output terminal, wherein at least one end of each voltage divider resistor serves as a voltage divider terminal, so that the voltage of the corresponding voltage divider terminal is used as the gray level voltage of the binding point gray level.

[0023] Optionally, the first voltage divider circuit and the second voltage divider circuit together include m voltage divider resistors, the first end of the first voltage divider resistor is connected to the first reference voltage output terminal, and the second end of the mth voltage divider resistor is connected to the third reference voltage output terminal;

[0024] The grayscale voltage generation module further includes m-1 first switches and m second switches. In the first voltage divider circuit and the second voltage divider circuit, the j-1th voltage divider resistor and the jth voltage divider resistor are connected to the j-1th first switch. The second end of the k-1th voltage divider resistor and the first end of the kth voltage divider resistor are connected to the first end of the k-1th second switch. The second end of the mth voltage divider resistor is connected to the first end of the mth second switch. The second end of each second switch is connected to the second reference voltage output terminal. 2≤j≤m, 2≤k≤m-1;

[0025] Wherein, the xth first switch is in the off state, and the rest of the first switches are in the on state; the xth second switch is in the on state, and the rest of the second switches are in the off state; 1≤x≤m-1.

[0026] Secondly, embodiments of the present invention provide a display driving method, including:

[0027] A first reference voltage and a second reference voltage are generated based on the power supply voltage. The first reference voltage is greater than the second reference voltage. The difference between the power supply voltage and the second reference voltage is greater than or equal to a preset difference. The difference between the power supply voltage and the first reference voltage is less than the preset difference.

[0028] Generate grayscale voltages corresponding to at least one binding point grayscale level in the binding point grayscale group based on the first reference voltage and the second reference voltage, and generate grayscale voltages corresponding to the remaining binding point grayscale levels in the binding point grayscale group based on the second reference voltage and the third reference voltage.

[0029] Thirdly, embodiments of the present invention provide a display device, including a display panel and the display driving device described in the first aspect.

[0030] The display driving device, display driving method, and display device provided in this embodiment of the invention generate a first reference voltage and a second reference voltage based on the power supply voltage input from the power supply voltage terminal through a reference voltage generation module. The first reference voltage is greater than the second reference voltage, the difference between the power supply voltage and the second reference voltage is greater than or equal to a preset difference, and the difference between the power supply voltage and the first reference voltage is less than the preset difference. This makes the stability of the second reference voltage generated by the reference voltage generation module higher than that of the first reference voltage, and helps to reduce the power supply voltage, thereby reducing the power consumption of the display driving device. The grayscale voltage generation module generates grayscale voltages corresponding to at least one bound point grayscale level in the bound point grayscale group based on a first reference voltage and a second reference voltage. It also generates grayscale voltages corresponding to the remaining bound point grayscale levels in the group based on the second and third reference voltages. This ensures that the accuracy of the grayscale voltage generated by the grayscale voltage generation module based on the second and third reference voltages is higher than that based on the first and second reference voltages. When the grayscale voltage generated by the grayscale voltage generation module based on the first and second reference voltages is high, and the corresponding bound point grayscale level is low, the stability of the first reference voltage has a smaller impact on the display effect of that portion of the bound point grayscale levels. However, the higher stability of the second reference voltage ensures the display effect of the remaining bound point grayscale levels, thus helping to guarantee the display effect of all bound point grayscale levels. When the display driving device is applied to a display device, the technical solution of this embodiment not only reduces the power consumption of the display device, thereby extending the standby time, but also helps to guarantee the display effect of the display device.

[0031] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of the present invention, nor is it intended to limit the scope of the invention. Other features of the invention will become readily apparent from the following description. Attached Figure Description

[0032] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0033] Figure 1 This is a schematic diagram of the structure of a display device provided in an embodiment of the present invention;

[0034] Figure 2 This is a schematic diagram of the structure of a display driving device provided in an embodiment of the present invention;

[0035] Figure 3 This is a schematic diagram of another display driving device provided in an embodiment of the present invention;

[0036] Figure 4 This is a schematic diagram of another display driving device provided in an embodiment of the present invention;

[0037] Figure 5 This is a schematic diagram of another display driving device provided in an embodiment of the present invention;

[0038] Figure 6 This is a schematic diagram of another display driving device provided in an embodiment of the present invention;

[0039] Figure 7 This is a flowchart illustrating a display driving method provided in an embodiment of the present invention. Detailed Implementation

[0040] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0041] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0042] As described in the background section, existing display devices suffer from high power consumption, resulting in short standby times and impacting user experience. The inventors have discovered the following reasons for this problem: Existing display devices generally include a display panel and a display driver chip. The display panel includes light-emitting devices and pixel circuits. The display driver chip provides grayscale voltages to the pixel circuits in the display panel, driving the light-emitting devices to emit light and displaying corresponding grayscale levels. The display driver chip has multiple external voltage supplies, with the power supply voltage AVDD used to power analog circuits within the chip, such as the gamma voltage generation circuit. The gamma voltage generation circuit generates a reference voltage VGMP based on the power supply voltage AVDD. Multiple gamma voltages are obtained by voltage division between the reference voltage VGMP and the reference voltage VGSP. When performing gamma adjustment on the grayscale levels of the display panel, the appropriate gamma voltage can be selected as the corresponding grayscale voltage for the grayscale level. Reducing the power supply voltage AVDD can save power consumption of the display driver chip, thereby saving power consumption of the display device. However, hardware limitations require the difference between the power supply voltage AVDD and the reference voltage VGMP to be greater than or equal to approximately 0.3V. If this requirement is not met, the reference voltage VGMP generated by the gamma voltage generation circuit will become unstable, affecting the accuracy of the gamma voltage and grayscale voltage, thus impacting the display effect. Furthermore, the higher the maximum grayscale voltage required by the display panel, the higher the corresponding power supply voltage AVDD needs to be. These factors prevent the power supply voltage AVDD from being further reduced, resulting in higher power consumption and a shorter standby time for the display device.

[0043] In view of this, embodiments of the present invention provide a display driving device to reduce the power consumption of the display device, extend the standby time of the display device, and at the same time help to ensure the display effect. Figure 1 This is a schematic diagram of the structure of a display device provided in an embodiment of the present invention. Figure 2 This is a schematic diagram of the structure of a display driving device provided in an embodiment of the present invention. (In conjunction with...) Figure 1 and Figure 2 The display driving device 200 includes a reference voltage generation module 10 and a grayscale voltage generation module 20.

[0044] The reference voltage generation module 10 is connected to the power supply voltage terminal, which receives the power supply voltage AVDD. The reference voltage generation module 10 generates a first reference voltage VGMP1 and a second reference voltage VGMP2 based on the power supply voltage AVDD. The first reference voltage VGMP1 is greater than the second reference voltage VGMP2. The difference between the power supply voltage AVDD and the second reference voltage VGMP2 is greater than or equal to a preset difference, and the difference between the power supply voltage AVDD and the first reference voltage VGMP1 is less than the preset difference.

[0045] The grayscale voltage generation module 20 is connected to the reference voltage generation module 10 and the third reference voltage terminal. The third reference voltage terminal is input with a third reference voltage VGSP, which is less than the second reference voltage VGMP2. The grayscale voltage generation module 20 is used to generate grayscale voltages corresponding to at least one bound point grayscale in the bound point grayscale group based on the first reference voltage VGMP1 and the second reference voltage VGMP2, and to generate grayscale voltages corresponding to the remaining bound point grayscale in the bound point grayscale group based on the second reference voltage VGMP2 and the third reference voltage VGSP.

[0046] Specifically, the display device includes a display driver 100 and a display panel 200. The display driver 100 can be a display driver integrated circuit (DDIC) or a touch and display driver integration (TDDI) chip, etc. The display panel 200 includes multiple pixel circuits PX arranged in an array. Each pixel circuit PX includes a thin-film transistor, a storage capacitor, and a light-emitting device. The light-emitting device can be an organic light-emitting diode (OLED), etc., and the thin-film transistor includes a switching transistor and a driving transistor. The display driver 100 can transmit data voltages to each column of pixel circuits PX, so that the driving transistors in the pixel circuits PX can drive the light-emitting devices to emit light at a corresponding brightness according to the data voltage, enabling the display panel 200 to perform the display function.

[0047] The reference voltage generation module 10 and the grayscale voltage generation module 20 can be analog circuit modules. The power supply voltage AVDD is used to power the reference voltage generation module 10. The power supply voltage AVDD is greater than the second reference voltage VGMP2. The difference between the power supply voltage AVDD and the second reference voltage VGMP2 is greater than or equal to a preset difference, which can be expressed as AVDD-VGMP2≥ΔV, where ΔV represents the preset difference. The magnitude of the preset difference ΔV is determined by the specific structure of the reference voltage generation module 10. In one embodiment, ΔV=0.3V. The difference between the power supply voltage AVDD and the first reference voltage VGMP1 is less than the preset difference, which can be expressed as |AVDD-VGMP1|<ΔV. While satisfying this condition, the power supply voltage AVDD can be greater than, less than, or equal to the first reference voltage VGMP1.

[0048] The grayscale group includes multiple grayscale levels, which can be a pre-set set of display grayscale levels, such as at least some grayscale levels from grayscale 0 to grayscale 255. The grayscale voltage corresponding to the grayscale level is the voltage used to drive the light-emitting device to display the corresponding grayscale level. For example, the grayscale voltage can be the data voltage used to drive the light-emitting device, or a voltage related to the data voltage. By processing the grayscale voltage, the data voltage can be obtained. The grayscale voltage generation module 20 can divide the voltage between the first reference voltage VGMP1 and the second reference voltage VGMP2 to obtain multiple gamma voltages. The divided gamma voltages can be less than or equal to the first reference voltage VGMP1 and greater than or equal to the second reference voltage VGMP2, so that the corresponding voltage can be selected from these gamma voltages as the grayscale voltage corresponding to at least one grayscale level in the grayscale group. The grayscale voltage generation module 20 can also divide the voltage between the second reference voltage VGMP2 and the third reference voltage VGSP to obtain multiple gamma voltages. The divided gamma voltages can be less than or equal to the second reference voltage VGMP2 and greater than or equal to the third reference voltage VGSP, so as to select the corresponding voltage from these gamma voltages as the grayscale voltages corresponding to the remaining binding point grayscales in the binding point grayscale group.

[0049] Optionally, in one embodiment, the lower the displayed grayscale level, the higher the corresponding grayscale voltage. The grayscale voltage generation module 20 can generate the grayscale voltage corresponding to the lowest bound point grayscale level in the bound point grayscale group based on the first reference voltage VGMP1 and the second reference voltage VGMP2, and generate the grayscale voltages corresponding to the remaining bound point grayscale levels in the bound point grayscale group based on the second reference voltage VGMP2 and the third reference voltage VGSP. Since AVDD-VGMP2≥ΔV, the power supply voltage AVDD of the reference voltage generation module 10 and its output second reference voltage VGMP2 meet the voltage requirements of the analog circuit. However, |AVDD-VGMP1|<ΔV, so the stability of the second reference voltage VGMP2 generated by the reference voltage generation module 10 is higher than that of the first reference voltage VGMP1. This makes the accuracy of the grayscale voltage generated by the grayscale voltage generation module 20 based on the second reference voltage VGMP2 and the third reference voltage VGSP higher than the accuracy of the grayscale voltage generated by the grayscale voltage generation module 20 based on the first reference voltage VGMP1 and the second reference voltage VGMP2. In other words, the accuracy of the grayscale voltage corresponding to the grayscale levels of the bound points (excluding the lowest bound point grayscale level) in the bound point grayscale group is higher than the accuracy of the grayscale voltage corresponding to the lowest bound point grayscale level. Since the display image corresponding to the lowest bound point grayscale is relatively dark, especially when the lowest bound point grayscale is 0 grayscale, the corresponding display image is a black screen with no brightness. The stability of the first reference voltage VGMP1 only affects the grayscale voltage corresponding to the 0 grayscale. Even if the stability of the first reference voltage VGMP1 is not ideal, the brightness deviation under a black screen is difficult for the human eye to observe, so the stability of the first reference voltage VGMP1 has little impact on the display effect of the 0 grayscale. The stability of the second reference voltage VGMP2 is relatively high, which makes the accuracy of the grayscale voltage corresponding to the other bound point grayscale higher, ensuring the display effect of the other bound point grayscale, thus ensuring the display effect of all bound point grayscale.

[0050] For example, with the first reference voltage VGMP1 at 7.4V, the second reference voltage VGMP2 at 7.1V, and a preset difference ΔV = 0.3V, the power supply voltage AVDD can be set to 7.4V, such that AVDD - VGMP2 = ΔV, and |AVDD - VGMP1| < ΔV. In the prior art, the difference between the power supply voltage AVDD and the first reference voltage VGMP1 is generally set to be greater than or equal to the preset difference ΔV, i.e., AVDD - VGMP1 ≥ ΔV, and the minimum power supply voltage AVDD needs to be 7.7V. Compared with the prior art, the technical solution of this embodiment can reduce the power supply voltage AVDD by 0.3V, thereby achieving the purpose of saving power consumption. Furthermore, as analyzed above, this solution also helps to ensure the accuracy of the grayscale voltage corresponding to each grayscale point in the grayscale group, thereby ensuring the display effect of each grayscale point.

[0051] In summary, the technical solution of this embodiment of the invention generates a first reference voltage and a second reference voltage based on the power supply voltage input from the power supply voltage terminal through a reference voltage generation module. The first reference voltage is greater than the second reference voltage, the difference between the power supply voltage and the second reference voltage is greater than or equal to a preset difference, and the difference between the power supply voltage and the first reference voltage is less than the preset difference. This makes the stability of the second reference voltage generated by the reference voltage generation module higher than that of the first reference voltage, and helps to reduce the power supply voltage, thereby reducing the power consumption of the display driver device. The grayscale voltage generation module generates grayscale voltages corresponding to at least one bound point grayscale level in the bound point grayscale group based on a first reference voltage and a second reference voltage. It also generates grayscale voltages corresponding to the remaining bound point grayscale levels in the group based on the second and third reference voltages. This ensures that the accuracy of the grayscale voltage generated by the grayscale voltage generation module based on the second and third reference voltages is higher than that based on the first and second reference voltages. When the grayscale voltage generated by the grayscale voltage generation module based on the first and second reference voltages is high, and the corresponding bound point grayscale level is low, the stability of the first reference voltage has a smaller impact on the display effect of that portion of the bound point grayscale levels. However, the higher stability of the second reference voltage ensures the display effect of the remaining bound point grayscale levels, thus helping to guarantee the display effect of all bound point grayscale levels. When the display driving device is applied to a display device, the technical solution of this embodiment not only reduces the power consumption of the display device, thereby extending the standby time, but also helps to guarantee the display effect of the display device.

[0052] See Figure 2 Based on the above embodiments, optionally, the grayscale group of binding points includes n grayscale points, and the grayscale voltages V1 to Vn corresponding to the first to nth grayscale points decrease sequentially. The grayscale voltage generation module 20 generates the grayscale voltages corresponding to the first i grayscale points according to the first reference voltage VGMP1 and the second reference voltage VGMP2, and generates the grayscale voltages corresponding to the (i+1)th to nth grayscale points according to the second reference voltage VGMP2 and the third reference voltage VGSP, where 1≤i<n.

[0053] The first to nth bound-point grayscale includes at least a portion of grayscale levels from 0 to 255. Since VGMP1 > VGMP2, AVDD - VGMP2 ≥ ΔV, and |AVDD - VGMP1| < ΔV, the power supply voltage AVDD can be set to a smaller value. Furthermore, the stability of the second reference voltage VGMP2 generated by the reference voltage generation module 10 is higher than that of the first reference voltage VGMP1. The accuracy of the grayscale voltages corresponding to the first i bound-point grayscale levels generated by the grayscale voltage generation module 20 based on the first reference voltage VGMP1 and the second reference voltage VGMP2 is higher than the accuracy of the grayscale voltages corresponding to the (i+1)th to nth bound-point grayscale levels generated by it based on the second reference voltage VGMP2 and the third reference voltage VGSP. This results in higher accuracy of the grayscale voltages corresponding to the (i+1)th to nth bound-point grayscale levels, ensuring the display effect of the (i+1)th to nth bound-point grayscale levels. When the value of i is small, the stability of the first reference voltage VGMP1 has little impact on the overall display effect of the n bound gray levels, which helps to ensure the overall display effect of the display device.

[0054] Preferably, in one embodiment, i = 1, and the first binding point grayscale is the lowest grayscale. For example, the first binding point grayscale is grayscale 0, and the remaining binding point grayscales can be any grayscale from 1 to 255, with a higher grayscale voltage corresponding to a lower grayscale. The grayscale voltage generation module 20 generates the grayscale voltage V1 corresponding to the first binding point grayscale (i.e., grayscale 0) based on the first reference voltage VGMP1 and the second reference voltage VGMP2, and generates the grayscale voltages V2 to Vn corresponding to the second to nth binding point grayscales based on the second reference voltage VGMP2 and the third reference voltage VGSP. As analyzed above, the stability of the first reference voltage VGMP1 has little impact on the display effect of grayscale 0, while the stability of the second reference voltage VGMP2 is relatively high, resulting in higher accuracy of the grayscale voltages corresponding to the 2nd to nth bounding point grayscales. When the 2nd to nth bounding point grayscales only include a portion of the display grayscales from grayscale 1 to grayscale 255, the grayscale voltages corresponding to the remaining display grayscales need to be calculated based on the grayscale voltages corresponding to the 2nd to nth bounding point grayscales (e.g., using interpolation). Since the accuracy of the grayscale voltages corresponding to the 2nd to nth bounding point grayscales is relatively high, this ensures that the accuracy of the grayscale voltages corresponding to the remaining display grayscales is also relatively high, thus helping to guarantee the display effect of all display grayscales.

[0055] It should be noted that the above embodiments are only illustrative examples of the case where a lower grayscale level corresponds to a higher grayscale voltage. In other embodiments, when a higher grayscale level corresponds to a higher grayscale voltage, the technical solutions of the embodiments of the present invention are also applicable.

[0056] Figure 3This is a schematic diagram of another display driving device provided in an embodiment of the present invention. See also... Figure 3 In one embodiment, the reference voltage generation module 10 includes: a first reference voltage generation unit 110 and a second reference voltage generation unit 120.

[0057] The first reference voltage generation unit 110 is connected to the reference voltage terminal, the power supply voltage terminal and the grayscale voltage generation module 20. The reference voltage VREF is input to the reference voltage terminal. The first reference voltage generation unit 110 is used to convert the reference voltage VREF according to the power supply voltage AVDD to obtain the first reference voltage VGMP1.

[0058] The second reference voltage generation unit 120 is connected to the reference voltage terminal, the power supply voltage terminal and the grayscale voltage generation module 20. The second reference voltage generation unit 120 is used to convert the reference voltage VREF according to the power supply voltage AVDD to obtain the second reference voltage VGMP2.

[0059] Specifically, the power supply voltage AVDD is used to power the first reference voltage generation unit 110 and the second reference voltage generation unit 120. The first reference voltage generation unit 110 can boost the reference voltage VREF to obtain the first reference voltage VGMP1. The second reference voltage generation unit 120 can boost the reference voltage VREF to obtain the second reference voltage VGMP2.

[0060] Figure 4 This is a schematic diagram of another display driving device provided in an embodiment of the present invention. See also... Figure 4 Optionally, based on the above embodiments, the first reference voltage generation unit 110 includes a first boost circuit 111, a first resistor R1, and a second resistor R2. The first input terminal of the first boost circuit 111 is connected to a reference voltage terminal, the second input terminal of the first boost circuit 111 is connected to the first terminals of the first resistor R1 and the second resistor R2, the first power supply terminal of the first boost circuit 111 is connected to a power supply voltage terminal, the output terminal of the first boost circuit 111 serves as the first reference voltage output terminal, the second terminal of the first resistor R1 is connected to the output terminal of the first boost circuit 111, and the second power supply terminal of the first boost circuit 111 and the second terminal of the second resistor R2 are grounded to GND. The first boost circuit 111 is used to boost the reference voltage VREF according to the power supply voltage AVDD to obtain the first reference voltage VGMP1.

[0061] The second reference voltage generation unit 120 includes a second boost circuit 121, a third resistor R3, and a fourth resistor R4. The first input terminal of the second boost circuit 121 is connected to the reference voltage terminal. The second input terminal of the second boost circuit 121 is connected to the first terminals of the third resistor R3 and the fourth resistor R4. The first power supply terminal of the second boost circuit 121 is connected to the power supply voltage terminal. The output terminal of the second boost circuit 121 serves as the second reference voltage output terminal. The second terminal of the third resistor R3 is connected to the output terminal of the second boost circuit 121. The second power supply terminal of the second boost circuit 121 and the second terminal of the fourth resistor R4 are grounded to GND. The second boost circuit 121 is used to boost the reference voltage VREF according to the power supply voltage AVDD to obtain the second reference voltage VGMP2.

[0062] In this embodiment, both the first boost circuit 111 and the second boost circuit 121 can be boost circuits. In other embodiments, the first boost circuit 111 and the second boost circuit 121 can also be voltage buffer amplifiers, drive capability amplifiers, or voltage followers, etc.

[0063] The stability of the first reference voltage VGMP1 output by the first boost circuit 111 is determined by the voltage difference between the power supply voltage AVDD and the first reference voltage VGMP1. When AVDD-VGMP1≥ΔV, the stability of the first reference voltage VGMP1 is relatively good. The magnitude of the first reference voltage VGMP1 is determined by the reference voltage VREF, the first resistor R1, and the second resistor R2. The magnitude of the first reference voltage VGMP1 can be expressed as: VGMP1=(1+R1 / R2)*VREF.

[0064] Similarly, the stability of the second reference voltage VGMP2 output by the second boost circuit 121 is determined by the voltage difference between the power supply voltage AVDD and the second reference voltage VGMP2. When AVDD-VGMP2≥ΔV, the stability of the second reference voltage VGMP2 is better. The magnitude of the second reference voltage VGMP2 is determined by the reference voltage VREF, the third resistor R3, and the fourth resistor R4. The magnitude of the second reference voltage VGMP2 can be expressed as: VGMP2=(1+R3 / R4)*VREF.

[0065] Figure 5 This is a schematic diagram of another display driving device provided in an embodiment of the present invention. See also... Figure 5 In one embodiment, the grayscale voltage generation module 20 includes: a first voltage divider circuit 210 and a second voltage divider circuit 220.

[0066] The first voltage divider circuit 210 is connected to the first reference voltage output terminal and the second reference voltage output terminal of the reference voltage generation module 10. It is used to divide the voltage between the first reference voltage VGMP1 and the second reference voltage VGMP2 to obtain the gray level voltage corresponding to at least one gray level in the gray level group.

[0067] The second voltage divider circuit 220 is connected to the second reference voltage output terminal and the third reference voltage terminal. It is used to divide the voltage between the second reference voltage VGMP2 and the third reference voltage VGSP to obtain the gray level voltages corresponding to the remaining gray levels in the gray level group.

[0068] For example, when the grayscale group includes n grayscale points, the first voltage divider circuit 210 can divide the voltage between the first reference voltage VGMP1 and the second reference voltage VGMP2 to obtain multiple different gamma voltages that are less than or equal to the first reference voltage VGMP1 and greater than or equal to the second reference voltage VGMP2. When performing gamma adjustment on the first i grayscale points of the display panel, the corresponding gamma voltage can be selected as the grayscale voltage corresponding to each of the first i grayscale points. The second voltage divider circuit 220 can divide the voltage between the second reference voltage VGMP2 and the third reference voltage VGSP to obtain multiple different gamma voltages that are less than or equal to the second reference voltage VGMP2 and greater than or equal to the third reference voltage VGSP. When performing gamma adjustment on the (i+1)th to nth grayscale points of the display panel, the corresponding gamma voltage can be selected as the grayscale voltage corresponding to each of the (i+1)th to nth grayscale points. Wherein, 1≤i<n.

[0069] Furthermore, in one embodiment, the first voltage divider circuit 210 includes a plurality of voltage divider resistors connected in series between the first reference voltage output terminal and the second reference voltage output terminal, and the second voltage divider circuit 220 includes a plurality of voltage divider resistors connected in series between the second reference voltage output terminal and the third reference voltage terminal, wherein at least one end of each voltage divider resistor serves as a voltage divider terminal, so that the voltage of the corresponding voltage divider terminal (i.e., the gamma voltage mentioned above) is used as the gray level voltage of the bounding gray level.

[0070] Figure 6 This is a schematic diagram of another display driving device provided in an embodiment of the present invention. See also... Figure 6 In one embodiment, the first voltage divider circuit 210 and the second voltage divider circuit 220 together include m voltage divider resistors. The first end of the first voltage divider resistor is connected to the first reference voltage output terminal, and the second end of the m voltage divider resistor is connected to the third reference voltage terminal.

[0071] The grayscale voltage generation module 20 also includes m-1 first switches and m second switches. In the first voltage divider circuit 210 and the second voltage divider circuit 220, the j-1th voltage divider resistor and the jth voltage divider resistor are connected to the j-1th first switch. The second end of the k-1th voltage divider resistor and the first end of the kth voltage divider resistor are connected to the first end of the k-1th second switch. The second end of the mth voltage divider resistor is connected to the first end of the mth second switch. The second end of each second switch is connected to the second reference voltage output terminal, 2≤j≤m, 2≤k≤m-1.

[0072] In this configuration, the xth first switch is in the off state, and the remaining first switches are in the on state; the xth second switch is in the on state, and the remaining second switches are in the off state; 1 ≤ x ≤ m-1.

[0073] For example, when m = 1024, the first voltage divider circuit 210 and the second voltage divider circuit 220 together include 1024 voltage divider resistors, denoted as r1 to r1024. The grayscale voltage generation module 20 includes 1023 first switches K1-1 to K1-1023 and 1024 second switches K2-1 to K2-1024.

[0074] See also Figure 6 Based on the above embodiments, the grayscale group includes n grayscale points. The first voltage divider circuit 210 generates the grayscale voltages corresponding to the first i grayscale points based on the first reference voltage VGMP1 and the second reference voltage VGMP2. The second voltage divider circuit 220 generates the grayscale voltages corresponding to the (i+1)th to nth grayscale points based on the second reference voltage VGMP2 and the third reference voltage VGSP. The magnitude of the second reference voltage VGMP2 is related to the grayscale voltage corresponding to the (i+1)th grayscale point at the preset display brightness level, and the magnitude of the first reference voltage VGMP1 is related to the grayscale voltage corresponding to the first grayscale point at the preset display brightness level. The grayscale voltage corresponding to the first grayscale point at the preset display brightness level is the maximum grayscale voltage.

[0075] Preferably, the grayscale voltage corresponding to the first bound point grayscale at the preset display brightness level is equal to the sum of the grayscale voltage adjustment value corresponding to the (i+1)th bound point grayscale at the preset display brightness level and the preset voltage value. Preferably, the power supply voltage AVDD is equal to the sum of the second reference voltage VGMP2 and the preset difference.

[0076] Specifically, the brightness bar on the display panel is used to adjust the display brightness level, also known as the Display Brightness Value (DBV). Each brightness level corresponds to the brightness of the highest grayscale level on the display panel. Changing the brightness of the highest grayscale level will change the brightness of the other grayscale levels. The preset brightness level can be the lowest brightness level, corresponding to 2 nits when the brightness bar is at its darkest position.

[0077] The following explanation uses i=1 and m=1024 as an example to illustrate the gamma debugging process based on the display driver. In the n bound grayscale levels, the first bound grayscale level is 0, the second bound grayscale level is 1, the nth bound grayscale level is 255, and the third to (n-1)th bound grayscale levels can be any display grayscale level from 1 to 255. In one implementation, the lower the display grayscale level, the higher the corresponding grayscale voltage. The display image corresponding to 0 grayscale is a black image, and the grayscale voltage corresponding to 0 grayscale is also called the black state voltage. Under the same display brightness level, the black state voltage is greater than the grayscale voltages corresponding to other display grayscale levels. When the preset display brightness level is the lowest display brightness level, the grayscale voltage corresponding to the first bound grayscale level (i.e., 0 grayscale) at the preset display brightness level is the maximum grayscale voltage of the display panel, i.e., the maximum black state voltage. The first reference voltage VGMP1 needs to be greater than or equal to the maximum black state voltage. The first reference voltage VGMP1 can be determined by determining the maximum black state voltage corresponding to the gray level of the first binding point.

[0078] Based on the maximum black-state voltage of display devices in the same production batch, the initial values ​​of the power supply voltage AVDD and the first reference voltage VGMP1 can be preset. For example, the initial value of the power supply voltage AVDD can be set to 7.7V, and the initial value of the first reference voltage VGMP1 can be set to 7.4V. On this basis, the grayscale voltage corresponding to each bound point grayscale at the preset display brightness level is adjusted. First, the grayscale voltage corresponding to the (i+1)th bound point grayscale is adjusted, which is the grayscale voltage corresponding to the second bound point grayscale, or the grayscale voltage corresponding to grayscale 1. Since grayscale 0 displays a black screen with no brightness, it is inconvenient to adjust; therefore, the grayscale voltage corresponding to grayscale 0 can be obtained based on the grayscale voltage corresponding to grayscale 1. For example, when the grayscale voltage V2 corresponding to grayscale 1 at the preset display brightness level is 7.1V, the grayscale voltage V1 corresponding to grayscale 0 is V2 + V0, where V0 represents the preset voltage value. The value of V0 can be set according to the actual parameters of the display panel. In this embodiment, V0 = 0.3V, then V1 = 7.4V, and the maximum black state voltage of the display panel is 7.4V. At this time, the second switches K2-1 to K2-1024 are all turned off, and the first switches K1-1 to K1-1023 are all turned on.

[0079] Based on the grayscale voltage V1 corresponding to the first bound point grayscale (0 grayscale) and the grayscale voltage V2 corresponding to the second bound point grayscale (1 grayscale), the positions of grayscale voltages V1 and V2 in the first voltage divider circuit 210 and the second voltage divider circuit 220 are determined. Specifically, grayscale voltage V1 corresponds to the voltage at the second terminal of voltage divider resistor r1, and grayscale voltage V2 corresponds to the voltage at the second terminal of voltage divider resistor rx. Based on the grayscale voltage V2 corresponding to the second bound point grayscale at the preset display brightness level, the reference voltage VREF, the third resistor R3, and the fourth resistor R4 are set so that the second reference voltage VGMP2 output by the second boost circuit 121 is equal to or close to the grayscale voltage V2. Based on this, the xth first switch K1-x is controlled to be in the off state, while the remaining first switches are turned on; the xth second switch K2-x is turned on, while the remaining second switches are turned off, so that the gray level voltage V1 corresponding to the first binding point gray level is generated by the first voltage divider circuit 210 according to the first reference voltage VGMP1 and the second reference voltage VGMP2; and the gray level voltages V2 to Vn corresponding to the second to nth binding point gray levels are generated by the second voltage divider circuit 220 according to the second reference voltage VGMP2 and the third reference voltage VGSP.

[0080] Since the initial value of the first reference voltage VGMP1 and the grayscale voltage V1 corresponding to the first binding point grayscale are both 7.4V, the first reference voltage VGMP1 can remain unchanged at 7.4V. The preset adjustment value of the grayscale voltage V2 corresponding to the second binding point grayscale at the preset display brightness level is 7.1V, and the second reference voltage VGMP2 is approximately 7.1V. When the preset difference ΔV = 0.3V, the power supply voltage AVDD can be changed from 7.7V to 7.1V + 0.3V = 7.4V to satisfy AVDD - VGMP2 ≥ ΔV, ensuring the stability of the second reference voltage VGMP2 output by the second boost circuit 121. Since |AVDD-VGMP1| < ΔV, although the stability of the first reference voltage VGMP1 output by the first boost circuit 111 is not ideal, the first reference voltage VGMP1 only affects the accuracy of the grayscale voltage V1 at grayscale 0. Since the display screen corresponding to grayscale 0 is a black screen with no brightness, the human eye cannot easily observe the brightness deviation under a black screen. Therefore, the stability of the first reference voltage VGMP1 has a relatively small impact on the display effect of grayscale 0. The stability of the second reference voltage VGMP2 is higher, resulting in higher accuracy of the grayscale voltages corresponding to the second to nth bound-point grayscales, ensuring the display effect of the remaining bound-point grayscales, thus guaranteeing the display effect of all bound-point grayscales. Simultaneously, the power supply voltage AVDD is changed from 7.7V to 7.4V. Compared with existing technologies, the power supply voltage AVDD can be reduced by 0.3V, thereby achieving the purpose of saving power consumption.

[0081] Based on this, the values ​​of the power supply voltage AVDD, the first reference voltage VGMP1, and the second reference voltage VGMP2 in the display driver were determined. Building upon this, gamma adjustments can then be performed on the remaining bound point grayscale levels at the preset display brightness level, as well as on the gamma adjustments for each bound point grayscale at other display brightness levels.

[0082] In summary, when the display driving device provided in the embodiments of the present invention is applied to a display device, it can not only reduce the power consumption of the display device and thus extend the standby time of the display device, but also help to ensure the display effect of the display device.

[0083] Based on the same inventive concept, the embodiments of the invention also provide a display device, including a display panel and a display driving device as described in any of the above embodiments. Therefore, it possesses the corresponding functional structure and beneficial effects of a display driving device, which will not be elaborated further here. Specifically, the display panel can be an OLED display panel or a Micro-LED display panel, etc. The display device can be a mobile phone, or any electronic product with display functionality, including but not limited to the following categories: televisions, laptops, desktop monitors, tablets, digital cameras, smart bracelets, smart glasses, automotive displays, medical devices, industrial control equipment, touch interactive terminals, etc. The embodiments of the present invention do not impose any special limitations on these categories.

[0084] Based on the same inventive concept, embodiments of the present invention also provide a display driving method, which can be executed by the display driving device in any of the above embodiments. Figure 7 This is a schematic flowchart of a display driving method provided in an embodiment of the present invention. See also: Figure 7 The method specifically includes the following steps:

[0085] S110. Generate a first reference voltage and a second reference voltage based on the power supply voltage. The first reference voltage is greater than the second reference voltage. The difference between the power supply voltage and the second reference voltage is greater than or equal to a preset difference. The difference between the power supply voltage and the first reference voltage is less than the preset difference.

[0086] S120. Generate gray level voltage corresponding to at least one binding point gray level in the binding point gray level group based on the first reference voltage and the second reference voltage.

[0087] S130. Generate the gray level voltages corresponding to the remaining gray levels in the gray level group based on the second reference voltage and the third reference voltage.

[0088] The technical solution of this invention involves a reference voltage generation module generating a first reference voltage and a second reference voltage based on the power supply voltage input from the power supply voltage terminal. The first reference voltage is greater than the second reference voltage, the difference between the power supply voltage and the second reference voltage is greater than or equal to a preset difference, and the difference between the power supply voltage and the first reference voltage is less than the preset difference. This makes the stability of the second reference voltage generated by the reference voltage generation module higher than that of the first reference voltage, and helps to reduce the power supply voltage, thereby reducing the power consumption of the display driver device. The grayscale voltage generation module generates grayscale voltages corresponding to at least one bound point grayscale level in the bound point grayscale group based on a first reference voltage and a second reference voltage. It also generates grayscale voltages corresponding to the remaining bound point grayscale levels in the group based on the second and third reference voltages. This ensures that the accuracy of the grayscale voltage generated by the grayscale voltage generation module based on the second and third reference voltages is higher than that based on the first and second reference voltages. When the grayscale voltage generated by the grayscale voltage generation module based on the first and second reference voltages is high, and the corresponding bound point grayscale level is low, the stability of the first reference voltage has a smaller impact on the display effect of that portion of the bound point grayscale levels. However, the higher stability of the second reference voltage ensures the display effect of the remaining bound point grayscale levels, thus helping to guarantee the display effect of all bound point grayscale levels. When the display driving device is applied to a display device, the technical solution of this embodiment not only reduces the power consumption of the display device, thereby extending the standby time, but also helps to guarantee the display effect of the display device.

[0089] Optionally, step S110 specifically includes:

[0090] The reference voltage is converted based on the power supply voltage to obtain the first reference voltage; the reference voltage is then converted based on the power supply voltage to obtain the second reference voltage.

[0091] Optionally, converting the reference voltage according to the power supply voltage to obtain a first reference voltage includes: boosting the reference voltage according to the power supply voltage to obtain a first reference voltage; converting the reference voltage according to the power supply voltage to obtain a second reference voltage includes: boosting the reference voltage according to the power supply voltage to obtain a second reference voltage.

[0092] Optionally, step S120 includes:

[0093] The voltage between the first reference voltage and the second reference voltage is divided to obtain the gray level voltage corresponding to at least one gray level in the gray level group of the binding points;

[0094] Step S130 includes:

[0095] The voltage between the second reference voltage and the third reference voltage is divided to obtain the gray level voltages corresponding to the remaining gray levels in the gray level group of the bound points.

[0096] Optionally, based on the above embodiments, the first voltage divider circuit and the second voltage divider circuit in the display driving device together include m voltage divider resistors. The first end of the first voltage divider resistor is connected to the first reference voltage output terminal, and the second end of the m-th voltage divider resistor is connected to the third reference voltage output terminal. The grayscale voltage generation module also includes m-1 first switches and m second switches. In the first voltage divider circuit and the second voltage divider circuit, the (j-1)-th voltage divider resistor and the j-th voltage divider resistor are connected to the (j-1)-th first switch. The second end of the (k-1)-th voltage divider resistor and the first end of the k-th voltage divider resistor are connected to the first end of the (k-1)-th second switch. The second end of the m-th voltage divider resistor is connected to the first end of the m-th second switch. The second end of each second switch is connected to the second reference voltage output terminal, 2≤j≤m, 2≤k≤m-1.

[0097] The display driver method also includes:

[0098] Control the x-th first switch to be in the off state and the remaining first switches to be in the on state, and control the x-th second switch to be in the on state and the remaining second switches to be in the off state, 1≤x≤m-1.

[0099] It should be understood that the various forms of processes shown above can be used, with steps reordered, added, or deleted. For example, the steps described in this invention can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution of this invention can be achieved, and no limitation is imposed herein.

[0100] The specific embodiments described above do not constitute a limitation on the scope of protection of this invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A display driving device, characterized in that, include: A reference voltage generation module is connected to a power supply voltage terminal and is used to generate a first reference voltage and a second reference voltage based on the power supply voltage input to the power supply voltage terminal. The first reference voltage is greater than the second reference voltage, the difference between the power supply voltage and the second reference voltage is greater than or equal to a preset difference, and the absolute value of the difference between the power supply voltage and the first reference voltage is less than the preset difference. The reference voltage generation module includes: The first reference voltage generation unit is connected to the reference voltage terminal, the power supply voltage terminal, and the grayscale voltage generation module. It is used to convert the reference voltage input to the reference voltage terminal according to the power supply voltage to obtain the first reference voltage. The second reference voltage generation unit is connected to the reference voltage terminal, the power supply voltage terminal, and the grayscale voltage generation module. It is used to convert the reference voltage according to the power supply voltage to obtain the second reference voltage. A grayscale voltage generation module is connected to the reference voltage generation module and a third reference voltage terminal. The third reference voltage input to the third reference voltage terminal is less than the second reference voltage. The grayscale voltage generation module is used to generate grayscale voltages corresponding to at least one binding point grayscale in the binding point grayscale group based on the first reference voltage and the second reference voltage, and to generate grayscale voltages corresponding to the remaining binding point grayscales in the binding point grayscale group based on the second reference voltage and the third reference voltage.

2. The display driving device according to claim 1, characterized in that, The grayscale group of binding points includes n grayscale levels of binding points. The grayscale voltage corresponding to the first to the nth grayscale level of binding points decreases sequentially. The grayscale voltage generation module generates the grayscale voltage corresponding to the first i grayscale levels of binding points based on the first reference voltage and the second reference voltage, and generates the grayscale voltage corresponding to the (i+1)th to the nth grayscale levels of binding points based on the second reference voltage and the third reference voltage, where 1≤i<n; i=1; The gray level of the first binding point is the lowest gray level.

3. The display driving device according to claim 2, characterized in that, The magnitude of the second reference voltage is related to the grayscale voltage corresponding to the (i+1)th grayscale of the binding point under the preset display brightness level, and the magnitude of the first reference voltage is related to the grayscale voltage corresponding to the first grayscale of the binding point under the preset display brightness level; wherein, the grayscale voltage corresponding to the first grayscale of the binding point under the preset display brightness level is the maximum grayscale voltage. The grayscale voltage corresponding to the first grayscale of the binding point under the preset display brightness level is equal to the sum of the grayscale voltage adjustment value and the preset voltage value corresponding to the (i+1)th grayscale of the binding point under the preset display brightness level. The power supply voltage is equal to the sum of the second reference voltage and the preset difference.

4. The display driving device according to claim 3, characterized in that, The first reference voltage generation unit includes a first boost circuit, a first resistor, and a second resistor; The first input terminal of the first boost circuit is connected to the reference voltage terminal, the second input terminal of the first boost circuit is connected to the first terminal of the first resistor and the first terminal of the second resistor, the first power supply terminal of the first boost circuit is connected to the power supply voltage terminal, the output terminal of the first boost circuit serves as the first reference voltage output terminal, the second terminal of the first resistor is connected to the output terminal of the first boost circuit, and the second power supply terminal of the first boost circuit and the second terminal of the second resistor are grounded. The first boost circuit is used to boost the reference voltage according to the power supply voltage to obtain the first reference voltage.

5. The display driving device according to claim 3, characterized in that, The second reference voltage generation unit includes a second boost circuit, a third resistor, and a fourth resistor; The first input terminal of the second boost circuit is connected to the reference voltage terminal, the second input terminal of the second boost circuit is connected to the first terminals of the third resistor and the fourth resistor, the first power supply terminal of the second boost circuit is connected to the power supply voltage terminal, the output terminal of the second boost circuit serves as the second reference voltage output terminal, the second terminal of the third resistor is connected to the output terminal of the second boost circuit, and the second power supply terminal of the second boost circuit and the second terminal of the fourth resistor are grounded. The second boost circuit is used to boost the reference voltage according to the power supply voltage to obtain the second reference voltage.

6. The display driving device according to any one of claims 1-5, characterized in that, The grayscale voltage generation module includes: The first voltage divider circuit is connected to the first reference voltage output terminal and the second reference voltage output terminal of the reference voltage generation module. It is used to divide the voltage between the first reference voltage and the second reference voltage to obtain the gray level voltage corresponding to at least one of the binding point gray levels in the binding point gray level group. The second voltage divider circuit is connected to the output terminal of the second reference voltage and the third reference voltage, and is used to divide the voltage between the second reference voltage and the third reference voltage to obtain the gray level voltage corresponding to the remaining gray levels in the gray level group of the binding points. The first voltage divider circuit includes a plurality of voltage divider resistors connected in series between the first reference voltage output terminal and the second reference voltage output terminal. The second voltage divider circuit includes a plurality of voltage divider resistors connected in series between the second reference voltage output terminal and the third reference voltage output terminal. At least one end of each voltage divider resistor serves as a voltage divider terminal, so that the voltage of the corresponding voltage divider terminal is used as the gray level voltage of the binding point gray level.

7. The display driving device according to claim 6, characterized in that, The first voltage divider circuit and the second voltage divider circuit together include m voltage divider resistors. The first end of the first voltage divider resistor is connected to the first reference voltage output terminal, and the second end of the m-th voltage divider resistor is connected to the third reference voltage output terminal. The grayscale voltage generation module further includes m-1 first switches and m second switches. In the first voltage divider circuit and the second voltage divider circuit, the j-1th voltage divider resistor and the jth voltage divider resistor are connected to the j-1th first switch. The second end of the k-1th voltage divider resistor and the first end of the kth voltage divider resistor are connected to the first end of the k-1th second switch. The second end of the mth voltage divider resistor is connected to the first end of the mth second switch. The second end of each second switch is connected to the second reference voltage output terminal. 2≤j≤m, 2≤k≤m-1; Wherein, the xth first switch is in the off state, and the rest of the first switches are in the on state; the xth second switch is in the on state, and the rest of the second switches are in the off state; 1≤x≤m-1.

8. A display driving method, characterized in that, include: A first reference voltage and a second reference voltage are generated based on the power supply voltage. The first reference voltage is greater than the second reference voltage. The difference between the power supply voltage and the second reference voltage is greater than or equal to a preset difference. The absolute value of the difference between the power supply voltage and the first reference voltage is less than the preset difference. The step of generating the first reference voltage and the second reference voltage based on the power supply voltage includes: The first reference voltage generation unit is connected to the reference voltage terminal, the power supply voltage terminal, and the grayscale voltage generation module. It is used to convert the reference voltage input to the reference voltage terminal according to the power supply voltage to obtain the first reference voltage. The second reference voltage generation unit is connected to the reference voltage terminal, the power supply voltage terminal, and the grayscale voltage generation module. It is used to convert the reference voltage according to the power supply voltage to obtain the second reference voltage. Generate grayscale voltages corresponding to at least one binding point grayscale level in the binding point grayscale group based on the first reference voltage and the second reference voltage, and generate grayscale voltages corresponding to the remaining binding point grayscale levels in the binding point grayscale group based on the second reference voltage and the third reference voltage.

9. A display device, characterized in that, It includes a display panel and a display driving device as described in any one of claims 1-7.

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