CN116453462A - Display driving device, display driving method and display device - Google Patents

Display driving device, display driving method and display device Download PDF

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Publication number
CN116453462A
CN116453462A CN202310443364.6A CN202310443364A CN116453462A CN 116453462 A CN116453462 A CN 116453462A CN 202310443364 A CN202310443364 A CN 202310443364A CN 116453462 A CN116453462 A CN 116453462A
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China
Prior art keywords
voltage
reference voltage
gray scale
binding point
gray
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CN202310443364.6A
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Chinese (zh)
Inventor
王铁钢
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Yungu Guan Technology Co Ltd
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Yungu Guan Technology Co Ltd
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Priority to CN202310443364.6A priority Critical patent/CN116453462A/en
Publication of CN116453462A publication Critical patent/CN116453462A/en
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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/2003—Display of colours
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0271—Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
    • G09G2330/02—Details of power systems and of start or stop of display operation
    • G09G2330/021—Power management, e.g. power saving
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D10/00—Energy efficient computing, e.g. low power processors, power management or thermal management

Abstract

The embodiment of the 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 gray scale voltage generation module; the reference voltage generation module is used for generating a first reference voltage and a second reference voltage according to the power supply voltage input by the power supply voltage end, wherein the first reference voltage is larger than the second reference voltage, the difference value between the power supply voltage and the second reference voltage is larger than or equal to a preset difference value, and the difference value between the power supply voltage and the first reference voltage is smaller than the preset difference value; the gray level voltage generation module is used for generating gray level voltages corresponding to at least one binding point gray level in the binding point gray level group according to the first reference voltage and the second reference voltage, and generating gray level voltages corresponding to the rest binding point gray levels in the binding point gray level group according to the second reference voltage and the third reference voltage. The technical scheme of the embodiment of the invention is beneficial to reducing the power consumption of the display device, prolonging the standby time of the display device and simultaneously guaranteeing the display effect.

Description

Display driving device, display driving method and display device
Technical Field
The embodiment of the invention relates to the technical field of display, in particular to a display driving device, a display driving method and a display device.
Background
With the continuous development of display technology, performance requirements of display devices are increasing. At present, the existing display device has the problem of larger power consumption, so that the standby time of the display device is shorter, and the user experience is influenced.
Disclosure of Invention
The embodiment of the invention provides a display driving device, a display driving method and a display device, which are used for reducing the power consumption of the display device, prolonging the standby time of the display device and simultaneously helping to ensure the display effect.
In a first aspect, an embodiment of the present invention provides a display driving apparatus, including:
the reference voltage generation module is connected with a power supply voltage end and is used for generating a first reference voltage and a second reference voltage according to the power supply voltage input by the power supply voltage end, wherein the first reference voltage is larger than the second reference voltage, the difference value between the power supply voltage and the second reference voltage is larger than or equal to a preset difference value, and the difference value between the power supply voltage and the first reference voltage is smaller than the preset difference value;
the gray scale voltage generation module is connected with the reference voltage generation module and a third reference voltage end, the third reference voltage input by the third reference voltage end is smaller than the second reference voltage, and the gray scale voltage generation module is used for generating gray scale voltages corresponding to at least one binding point gray scale in the binding point gray scale group according to the first reference voltage and the second reference voltage, and generating gray scale voltages corresponding to the rest binding point gray scales in the binding point gray scale group according to the second reference voltage and the third reference voltage.
Optionally, the binding point gray scale group includes n binding point gray scales, gray scale voltages corresponding to the 1 st to n th binding point gray scales are sequentially reduced, the gray scale voltage generating module generates gray scale voltages corresponding to the first i binding point gray scales according to the first reference voltage and the second reference voltage, and generates the gray scale voltages corresponding to the i+1th to n th binding point gray scales according to the second reference voltage and the third reference voltage, wherein i is less than or equal to 1 < n; preferably, i=1;
preferably, the 1 st binding point gray level is the lowest gray level.
Optionally, the magnitude of the second reference voltage is related to a gray-scale voltage corresponding to the (i+1) th binding point gray-scale under a preset display brightness level, and the magnitude of the first reference voltage is related to a gray-scale voltage corresponding to the (1) th binding point gray-scale under the preset display brightness level; the gray-scale voltage corresponding to the 1 st binding point gray-scale under the preset display brightness level is the maximum gray-scale voltage;
preferably, the gray-scale voltage corresponding to the 1 st binding point gray-scale under the preset display brightness level is equal to the sum of the gray-scale voltage debugging value corresponding to the i+1 th binding point gray-scale under the preset display brightness level and the preset voltage value;
Preferably, the power supply voltage is equal to a sum of the second reference voltage and the preset difference value.
Optionally, the reference voltage generating module includes:
the first reference voltage generation unit is connected with a reference voltage end, the power supply voltage end and the gray scale voltage generation module and is used for converting the reference voltage input by the reference voltage end according to the power supply voltage to obtain a first reference voltage;
and the second reference voltage generating unit is connected with the reference voltage end, the power supply voltage end and the gray scale voltage generating module and is used for converting the reference voltage according to the power supply voltage to obtain a second reference voltage.
Optionally, the first reference voltage generating unit includes a first boost circuit, a first resistor, and a second resistor;
the first input end of the first voltage boosting circuit is connected with the reference voltage end, the second input end of the first voltage boosting circuit is connected with the first end of the first resistor and the first end of the second resistor, the first power end of the first voltage boosting circuit is connected with the power voltage end, the output end of the first voltage boosting circuit serves as a first reference voltage output end, the second end of the first resistor is connected with the output end of the first voltage boosting circuit, the second power end of the first voltage boosting circuit and the second end of the second resistor are grounded, and the first voltage boosting circuit is used for boosting the reference voltage according to the power voltage to obtain a first reference voltage.
Optionally, the second reference voltage generating unit includes a second boost circuit, a third resistor, and a fourth resistor;
the first input end of the second voltage boosting circuit is connected with the reference voltage end, the second input end of the second voltage boosting circuit is connected with the third resistor and the first end of the fourth resistor, the first power end of the second voltage boosting circuit is connected with the power voltage end, the output end of the second voltage boosting circuit serves as a second reference voltage output end, the second end of the third resistor is connected with the output end of the second voltage boosting circuit, the second power end of the second voltage boosting circuit and the second end of the fourth resistor are grounded, and the second voltage boosting circuit is used for boosting the reference voltage according to the power voltage to obtain a second reference voltage.
Optionally, the gray scale voltage generating module includes:
the first voltage dividing circuit is connected with a first reference voltage output end and a second reference voltage output end of the reference voltage generating module and is used for dividing the voltage between the first reference voltage and the second reference voltage so as to obtain gray scale voltages corresponding to at least one binding point gray scale in the binding point gray scale group;
The second voltage dividing circuit is connected with the second reference voltage output end and the third reference voltage end and is used for dividing the voltage between the second reference voltage and the third reference voltage so as to obtain gray scale voltages corresponding to the gray scales of the other binding points in the binding point gray scale group;
preferably, the first voltage dividing circuit includes a plurality of voltage dividing resistors connected in series between the first reference voltage output terminal and the second reference voltage output terminal, the second voltage dividing circuit includes a plurality of voltage dividing resistors connected in series between the second reference voltage output terminal and the third reference voltage output terminal, and at least one end of each voltage dividing resistor is used as a voltage dividing terminal, so that the voltage of the corresponding voltage dividing terminal is used as the gray scale voltage of the binding point gray scale.
Optionally, the first voltage dividing circuit and the second voltage dividing circuit include m voltage dividing resistors, a first end of a 1 st voltage dividing resistor is connected with the first reference voltage output end, and a second end of an m th voltage dividing resistor is connected with the third reference voltage output end;
the gray scale voltage generation module further comprises m-1 first switches and m second switches, wherein j-1 first switches are connected between the j-1 voltage dividing resistor and the j-1 voltage dividing resistor, the second end of the k-1 voltage dividing resistor and the first end of the k-1 voltage dividing resistor are connected with the first end of the k-1 second switches, the second end of the m-1 voltage dividing resistor is connected with the first end of the m-th second switches, the second ends of the second switches are all connected with the second reference voltage output end, and j is more than or equal to 2 and less than or equal to m, and k is more than or equal to 2 and less than or equal to m-1;
The x-th first switch is in an off state, the rest of the first switches are in an on state, the x-th second switch is in an on state, and the rest of the second switches are in an off state, wherein x is more than or equal to 1 and less than or equal to m-1.
In a second aspect, an embodiment of the present invention provides a display driving method, including:
generating a first reference voltage and a second reference voltage according to a power supply voltage, wherein the first reference voltage is larger than the second reference voltage, the difference value between the power supply voltage and the second reference voltage is larger than or equal to a preset difference value, and the difference value between the power supply voltage and the first reference voltage is smaller than the preset difference value;
generating gray scale voltages corresponding to at least one binding point gray scale in a binding point gray scale group according to the first reference voltage and the second reference voltage, and generating gray scale voltages corresponding to the rest binding point gray scales in the binding point gray scale group according to the second reference voltage and the third reference voltage.
In a third aspect, an embodiment of the present invention provides a display device, including a display panel, and further including the display driving device in the first aspect.
According to the display driving device, the display driving method and the display device provided by the embodiment of the invention, the reference voltage generating module generates the first reference voltage and the second reference voltage according to the power voltage input by the power voltage end, the first reference voltage is larger than the second reference voltage, the difference value between the power voltage and the second reference voltage is larger than or equal to the preset difference value, and the difference value between the power voltage and the first reference voltage is smaller than the preset difference value, so that the stability of the second reference voltage generated by the reference voltage generating module is higher than that of the first reference voltage, and the reduction of the power voltage is facilitated, so that the power consumption of the display driving device is reduced. The gray scale voltage generating module generates the gray scale voltage corresponding to at least one binding point gray scale in the binding point gray scale group according to the first reference voltage and the second reference voltage, and generates the gray scale voltages corresponding to the rest binding point gray scales in the binding point gray scale group according to the second reference voltage and the third reference voltage, so that the accuracy of the gray scale voltages generated by the gray scale voltage generating module according to the second reference voltage and the third reference voltage is higher than that of the gray scale voltages generated by the gray scale voltage generating module according to the first reference voltage and the second reference voltage, and under the condition that the corresponding binding point gray scale is lower, the stability of the first reference voltage has smaller influence on the display effect of the part of the binding point gray scales, and the stability of the second reference voltage is higher, so that the display effect of the rest binding point gray scales can be ensured, and the display effect of all the binding point gray scales can be ensured. When the display driving device is applied to the display device, the technical scheme of the embodiment of the invention not only can reduce the power consumption of the display device, thereby prolonging the standby time of the display device, but also is helpful for ensuring the display effect of the display device.
It should be understood that the description in this section is not intended to identify key or critical features of the embodiments of the invention or to delineate the scope of the invention. Other features of the present invention will become apparent from the description that follows.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a display device according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a display driving device according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of another display driving apparatus according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of another display driving apparatus according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of another display driving apparatus according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of another display driving apparatus according to an embodiment of the present invention;
Fig. 7 is a schematic flow chart of a display driving method according to an embodiment of the invention.
Detailed Description
In order that those skilled in the art will better understand the present invention, a technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and the claims of the present invention and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the invention described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
As described in the background art, the existing display device has a problem of larger power consumption, so that the standby time of the display device is shorter, and the user experience is affected. The inventors found that the above problems occur for the following reasons: the conventional display device generally comprises a display panel and a display driving chip, wherein the display panel comprises a light emitting device and a pixel circuit, and the display driving chip can provide gray scale voltages for the pixel circuit in the display panel so as to drive the light emitting device to emit light through the pixel circuit, so that the display panel displays corresponding gray scales. The display driving chip has multiple external supply voltages, wherein the power supply voltage AVDD is used for supplying power to an analog circuit in the display driving chip, such as a gamma (gamma) voltage generating circuit. The gamma voltage generating circuit can generate a reference voltage VGMP according to the power voltage AVDD so as to divide the voltage between the reference voltage VGMP and the reference voltage VGSP to obtain a plurality of gamma voltages, and when gamma debugging is carried out on the gray scale of the binding point of the display panel, the corresponding gamma voltage can be selected as the gray scale voltage corresponding to the gray scale of the binding point. If the power supply voltage AVDD can be reduced, the power consumption of the display driving chip can be saved, thereby saving the power consumption of the display device. However, the difference between the power supply voltage AVDD and the reference voltage VGMP is greater than or equal to about 0.3V, and if not, the reference voltage VGMP generated by the gamma voltage generating circuit is unstable, which affects the accuracy of the gamma voltage and the gray scale voltage, thereby affecting the display effect. The larger the maximum gray-scale voltage required for the display panel is, the higher the corresponding power supply voltage AVDD is required. The above reasons cause that the power supply voltage AVDD cannot be further reduced, so that the power consumption of the display device is large, resulting in a problem that the standby time of the display device is short.
In view of this, the embodiment of the invention provides a display driving device, which is used for reducing the power consumption of the display device, prolonging the standby time of the display device and simultaneously helping to ensure the display effect. Fig. 1 is a schematic structural diagram of a display device according to an embodiment of the present invention. Fig. 2 is a schematic structural diagram of a display driving device according to an embodiment of the present invention. Referring to fig. 1 and 2, the display driving apparatus 200 includes: a reference voltage generation module 10 and a gray scale voltage generation module 20.
The reference voltage generating module 10 is connected to a power supply voltage terminal, the power supply voltage terminal inputs a power supply voltage AVDD, the reference voltage generating module 10 is configured to generate a first reference voltage VGMP1 and a second reference voltage VGMP2 according to the power supply voltage AVDD, the first reference voltage VGMP1 is greater than the second reference voltage VGMP2, a difference value between the power supply voltage AVDD and the second reference voltage VGMP2 is greater than or equal to a preset difference value, and the difference value between the power supply voltage AVDD and the first reference voltage VGMP1 is less than the preset difference value.
The gray level voltage generation module 20 is connected to the reference voltage generation module 10 and a third reference voltage terminal, the third reference voltage terminal inputs a third reference voltage VGSP, the third reference voltage VGSP is smaller than the second reference voltage VGMP2, the gray level voltage generation module 20 is configured to generate a gray level voltage corresponding to a gray level of at least one binding point in the binding point gray level group according to the first reference voltage VGMP1 and the second reference voltage VGMP2, and generate gray level voltages corresponding to gray levels of other binding points in the binding point gray level group according to the second reference voltage VGMP2 and the third reference voltage VGSP.
Specifically, the display device includes a display driving device 100 and a display panel 200. The display driving apparatus 100 may be a display driving chip (Display Driver Integrated Circuit, DDIC) or a touch and display driving integrated (Touch and Display Driver Integration, TDDI) chip, or the like. The display panel 200 includes a plurality of pixel circuits PX arranged in an array, each pixel circuit PX including a thin film transistor, a storage capacitor, and a light emitting device, which may be an organic light emitting diode OLED or the like, the thin film transistor including a switching transistor and a driving transistor. The display driving apparatus 100 is capable of transmitting a data voltage to each column of pixel circuits PX to drive the light emitting devices to emit light with corresponding luminance according to the data voltage through the driving transistors in the pixel circuits PX, so that the display panel 200 realizes a display function.
The reference voltage generation module 10 and the grayscale voltage generation module 20 may be analog circuit modules, and the power supply voltage AVDD is used to supply power to the reference voltage generation module 10. The power voltage AVDD is greater than the second reference voltage VGMP2, and the difference between the power voltage AVDD and the second reference voltage VGMP2 is greater than or equal to the preset difference, which may be expressed as AVDD-VGMP2 is greater than or equal to Δv, where Δv represents the preset difference, and the magnitude of the preset difference Δv is determined by the specific structure of the reference voltage generating module 10, and in one embodiment, Δv=0.3V. The difference between the power supply voltage AVDD and the first reference voltage VGMP1 is smaller than a preset difference, which may be expressed as |avdd-vgmp1| < Δv, and the power supply voltage AVDD may be greater than the first reference voltage VGMP1, or less than the first reference voltage VGMP1, or equal to the first reference voltage VGMP1 while satisfying the condition.
The binding point gray scale group comprises a plurality of binding point gray scales, and the binding point gray scales can be a preset group of display gray scales, such as at least part of gray scales from 0 gray scale to 255 gray scales. The gray scale voltage corresponding to the gray scale of the binding point is a voltage for driving the light emitting device to display a corresponding gray scale, for example, the gray scale voltage may be a data voltage for driving the light emitting device or a voltage related to the data voltage, and the data voltage may be obtained by processing the gray scale voltage. The gray scale voltage generation module 20 may divide a voltage between the first reference voltage VGMP1 and the second reference voltage VGMP2 to obtain a plurality of gamma voltages, and the divided gamma voltages may be less than or equal to the first reference voltage VGMP1 and greater than or equal to the second reference voltage VGMP2 to select a corresponding voltage from the gamma voltages as a gray scale voltage corresponding to at least one binding point gray scale in the binding point gray scale group. The gray scale voltage generating module 20 may further divide a voltage between the second reference voltage VGMP2 and the third reference voltage VGSP to obtain a plurality of gamma voltages, and the divided gamma voltages may be less than or equal to the second reference voltage VGMP2 and greater than or equal to the third reference voltage VGSP to select a corresponding voltage from the gamma voltages as a gray scale voltage corresponding to the gray scale of the remaining binding points in the binding point gray scale group.
Alternatively, in one embodiment, the lower the display gray scale, the higher the corresponding gray scale voltage. The gray scale voltage corresponding to the lowest binding point gray scale in the binding point gray scale group can be generated by the gray scale voltage generation module 20 according to the first reference voltage VGMP1 and the second reference voltage VGMP2, and the gray scale voltages corresponding to the rest binding points in the binding point gray scale group can be generated according to the second reference voltage VGMP2 and the third reference voltage VGSP. Since AVDD-VGMP2 is greater than or equal to Δv, the voltage requirement of the analog circuit is satisfied between the power voltage AVDD of the reference voltage generating module 10 and the second reference voltage VGMP2 outputted by the power voltage AVDD-VGMP2, and |avdd-VGMP1| < Δv, so that the stability of the second reference voltage VGMP2 generated by the reference voltage generating module 10 is higher than the stability of the first reference voltage VGMP1, so that the accuracy of the gray-scale voltage generated by the gray-scale voltage generating module 20 according to the second reference voltage VGMP2 and the third reference voltage VGSP is higher than the accuracy of the gray-scale voltage generated by the gray-scale voltage generating module 20 according to the first reference voltage VGMP1 and the second reference voltage VGMP2, that is, the accuracy of the gray-scale voltages corresponding to the rest of the binding point gray scales except the lowest binding point gray-scale in the binding point gray-scale group is higher than the accuracy of the gray-scale voltages corresponding to the lowest binding point gray-scale. Because the display screen corresponding to the gray level of the lowest binding point is darker, especially when the gray level of the lowest binding point is 0 gray level, the corresponding display screen is a black screen, the display screen has no brightness, the stability of the first reference voltage VGMP1 only affects the gray level voltage corresponding to the 0 gray level, even if the stability of the first reference voltage VGMP1 is not ideal, the stability of the first reference voltage VGMP1 has small influence on the display effect of the 0 gray level due to the fact that the human eyes are difficult to observe the brightness deviation under the black screen, and the stability of the second reference voltage VGMP2 is higher, so that the accuracy of the gray level voltages corresponding to the rest binding points is higher, the display effect of the gray level of the rest binding points can be ensured, and the display effect of the gray level of all binding points is ensured.
For example, in case that the first reference voltage VGMP1 is 7.4V, the second reference voltage VGMP2 is 7.1V, and the preset difference Δv=0.3V, the power supply voltage AVDD may be set to 7.4V such that AVDD-vgmp2=Δv, |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, that is, AVDD-VGMP1 is greater than or equal to Δv, and the minimum requirement of the power supply voltage AVDD is 7.7V. Compared with the prior art, the technical scheme of the embodiment of the invention can reduce the power supply voltage AVDD by 0.3V so as to achieve the purpose of saving power consumption, and meanwhile, as can be known from the analysis above, the scheme is also helpful for ensuring the accuracy of the gray scale voltages corresponding to the gray scales of all binding points in the gray scale group of the binding points, thereby ensuring the display effect of the gray scales of all the binding points.
In summary, according to the technical scheme of the embodiment of the present invention, the reference voltage generating module generates the first reference voltage and the second reference voltage according to the power voltage input by the power voltage terminal, the first reference voltage is greater than the second reference voltage, the difference between the power voltage and the second reference voltage is greater than or equal to the preset difference, and the difference between the power voltage and the first reference voltage is less than the preset difference, so that the stability of the second reference voltage generated by the reference voltage generating module is higher than that of the first reference voltage, and the power voltage is reduced, so that the power consumption of the display driving device is reduced. The gray scale voltage generating module generates the gray scale voltage corresponding to at least one binding point gray scale in the binding point gray scale group according to the first reference voltage and the second reference voltage, and generates the gray scale voltages corresponding to the rest binding point gray scales in the binding point gray scale group according to the second reference voltage and the third reference voltage, so that the accuracy of the gray scale voltages generated by the gray scale voltage generating module according to the second reference voltage and the third reference voltage is higher than that of the gray scale voltages generated by the gray scale voltage generating module according to the first reference voltage and the second reference voltage, and under the condition that the corresponding binding point gray scale is lower, the stability of the first reference voltage has smaller influence on the display effect of the part of the binding point gray scales, and the stability of the second reference voltage is higher, so that the display effect of the rest binding point gray scales can be ensured, and the display effect of all the binding point gray scales can be ensured. When the display driving device is applied to the display device, the technical scheme of the embodiment of the invention not only can reduce the power consumption of the display device, thereby prolonging the standby time of the display device, but also is helpful for ensuring the display effect of the display device.
Referring to fig. 2, optionally, the binding point gray scale group includes n binding point gray scales, the gray scale voltages V1 to Vn corresponding to the 1 st to nth binding point gray scales sequentially decrease, the gray scale voltage generating module 20 generates the gray scale voltages corresponding to the first i binding point gray scales according to the first reference voltage VGMP1 and the second reference voltage VGMP2, and generates the gray scale voltages corresponding to the i+1th to nth binding point gray scales according to the second reference voltage VGMP2 and the third reference voltage VGSP, and 1 is less than or equal to i < n.
The 1 st to nth binding point gray scales comprise at least part of gray scales from 0 gray scale to 255 gray scales. Because VGMP1 > VGMP2, AVDD-VGMP2 is larger than or equal to DeltaV, |AVDD-VGMP1| < DeltaV, the power supply voltage AVDD can be set smaller, 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 gray scale voltage corresponding to the gray scale of the first i binding point generated by the gray scale voltage generation module 20 according to the first reference voltage VGMP1 and the second reference voltage VGMP2 is higher than that of the gray scale voltage corresponding to the gray scale of the i+1th to n binding point generated by the gray scale voltage generation module according to the second reference voltage VGMP2 and the third reference voltage VGSP, so that the accuracy of the gray scale voltage corresponding to the gray scale of the i+1th to n binding point is higher, and the display effect of the gray scale of the i+1th to n binding point can be ensured. When the value of i is smaller, the stability of the first reference voltage VGMP1 has less influence on the overall display effect of the n binding point gray scales, which is helpful to ensure the overall display effect of the display device.
Preferably, in one embodiment, i=1, and the 1 st binding point gray level is the lowest gray level. Illustratively, the 1 st binding point gray level is 0 gray level, the rest of the binding points may be any gray level from 1 gray level to 255 gray levels, and the lower the display gray level, the higher the corresponding gray level voltage. The gray level voltage generation module 20 generates the 1 st binding point gray level, i.e., the gray level voltage V1 corresponding to the 0 th gray level, according to the first reference voltage VGMP1 and the second reference voltage VGMP2, and generates the 2 nd to nth binding point gray level voltages V2 to Vn according to the second reference voltage VGMP2 and the third reference voltage VGSP. According to the analysis, the stability of the first reference voltage VGMP1 has a small influence on the display effect of the 0 gray scale, and the stability of the second reference voltage VGMP2 is higher, so that the accuracy of the gray scale voltages corresponding to the 2 nd to nth binding point gray scales is higher, and in the case that the 2 nd to nth binding point gray scales only include part of the display gray scales from 1 gray scale to 255 gray scales, the gray scale voltages corresponding to the rest display gray scales need to be calculated (for example, calculated by adopting an interpolation method) according to the gray scale voltages corresponding to the 2 nd to nth binding point gray scales, and as the accuracy of the gray scale voltages corresponding to the 2 nd to nth binding point gray scales is higher, the accuracy of the gray scale voltages corresponding to the rest display gray scales is higher, so that the display effect of all the display gray scales is facilitated to be ensured.
The above embodiment is described only by way of example in which the lower the display gray scale is, the higher the corresponding gray scale voltage is. In other embodiments, when the display gray level is higher and the corresponding gray level voltage is higher, the technical solution of the embodiment of the present invention is applicable as well.
Fig. 3 is a schematic structural diagram of another display driving device according to an embodiment of the present invention. Referring to fig. 3, in one embodiment, the reference voltage generation module 10 includes: a first reference voltage generating unit 110 and a second reference voltage generating unit 120.
The first reference voltage generating unit 110 is connected to the reference voltage terminal, the power supply voltage terminal, and the gray scale voltage generating module 20, and the reference voltage VREF is input by the reference voltage terminal, and the first reference voltage generating unit 110 is configured to convert the reference voltage VREF according to the power supply voltage AVDD to obtain a first reference voltage VGMP1.
The second reference voltage generating unit 120 is connected to the reference voltage terminal, the power supply voltage terminal, and the gray scale voltage generating module 20, and the second reference voltage generating unit 120 is configured to convert the reference voltage VREF according to the power supply voltage AVDD to obtain a second reference voltage VGMP2.
Specifically, the power supply voltage AVDD is used to supply power to the first reference voltage generating unit 110 and the second reference voltage generating unit 120. The first reference voltage generating unit 110 may boost the reference voltage VREF to obtain the first reference voltage VGMP1. The second reference voltage generating unit 120 may boost the reference voltage VREF to obtain the second reference voltage VGMP2.
Fig. 4 is a schematic structural diagram of another display driving device according to an embodiment of the present invention. Referring to fig. 4, the first reference voltage generating unit 110 may optionally include a first boosting circuit 111, a first resistor R1, and a second resistor R2, on the basis of the above-described embodiments. The first input end of the first voltage boosting circuit 111 is connected with a reference voltage end, the second input end of the first voltage boosting circuit 111 is connected with first ends of the first resistor R1 and the second resistor R2, the first power end of the first voltage boosting circuit 111 is connected with a power voltage end, the output end of the first voltage boosting circuit 111 serves as a first reference voltage output end, the second end of the first resistor R1 is connected with the output end of the first voltage boosting circuit 111, the second power end of the first voltage boosting circuit 111 and the second end of the second resistor R2 are grounded GND, and the first voltage boosting circuit 111 is used for boosting the reference voltage VREF according to the power voltage AVDD to obtain a first reference voltage VGMP1.
The second reference voltage generating unit 120 includes a second boosting circuit 121, a third resistor R3, and a fourth resistor R4. The first input end of the second boost circuit 121 is connected with the reference voltage end, the second input end of the second boost circuit 121 is connected with the first ends of the third resistor R3 and the fourth resistor R4, the first power end of the second boost circuit 121 is connected with the power voltage end, the output end of the second boost circuit 121 serves as the second reference voltage output end, the second end of the third resistor R3 is connected with the output end of the second boost circuit 121, the second power end of the second boost circuit 121 and the second end of the fourth resistor R4 are grounded GND, and the second boost circuit 121 is used for boosting the reference voltage VREF according to the power voltage AVDD to obtain a second reference voltage VGMP2.
The first boost circuit 111 and the second boost circuit 121 may be boost circuits. In other embodiments, the first booster circuit 111 and the second booster circuit 121 may also be voltage buffer amplifiers, driving capability amplifiers, voltage followers, or the like.
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, and when AVDD-VGMP1 is greater than or equal to Δv, the stability of the first reference voltage VGMP1 is better. The magnitude of the first reference voltage VGMP1 is determined by the reference voltage VREF, the first resistor R1 and the second resistor R2, and the magnitude of the first reference voltage VGMP1 can be expressed as: vgmp1= (1+r1/R2) VREF.
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, and when AVDD-VGMP2 is greater than or equal to 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, and the magnitude of the second reference voltage VGMP2 can be expressed as: vgmp2= (1+r3/R4) VREF.
Fig. 5 is a schematic structural diagram of another display driving device according to an embodiment of the present invention. Referring to fig. 5, in one embodiment, the gray scale voltage generation module 20 includes: a first voltage dividing circuit 210 and a second voltage dividing circuit 220.
The first voltage dividing circuit 210 is connected to the first reference voltage output terminal and the second reference voltage output terminal of the reference voltage generating module 10, and is configured to divide a voltage between the first reference voltage VGMP1 and the second reference voltage VGMP2 to obtain a gray scale voltage corresponding to at least one binding point gray scale in the binding point gray scale group.
The second voltage dividing circuit 220 is connected to the second reference voltage output terminal and the third reference voltage terminal, and is configured to divide a voltage between the second reference voltage VGMP2 and the third reference voltage VGSP to obtain gray scale voltages corresponding to the gray scales of the remaining binding points in the binding point gray scale group.
For example, in the case where the binding point gray scale group includes n binding point gray scales, the first voltage dividing circuit 210 may divide the voltage between the first reference voltage VGMP1 and the second reference voltage VGMP2 to obtain a plurality of different gamma voltages which are less than or equal to the first reference voltage VGMP1 and greater than or equal to the second reference voltage VGMP2, and when gamma debugging is performed on the first i binding point gray scales of the display panel, the corresponding gamma voltages may be selected as the gray scale voltages corresponding to the first i binding point gray scales. The second voltage dividing circuit 220 may divide the voltage between the second reference voltage VGMP2 and the third reference voltage VGSP to obtain a plurality of different gamma voltages which are less than or equal to the second reference voltage VGMP2 and greater than or equal to the third reference voltage VGSP, and when performing gamma adjustment on the i+1th to nth binding point gray levels of the display panel, the corresponding gamma voltages may be selected as the gray level voltages corresponding to the i+1th to nth binding point gray levels. Wherein i is more than or equal to 1 and less than n.
Further, in one embodiment, the first voltage dividing circuit 210 includes a plurality of voltage dividing resistors connected in series between the first reference voltage output terminal and the second reference voltage output terminal, and the second voltage dividing circuit 220 includes a plurality of voltage dividing resistors connected in series between the second reference voltage output terminal and the third reference voltage output terminal, and at least one end of each voltage dividing resistor is used as a voltage dividing terminal, so that the voltage of the corresponding voltage dividing terminal (i.e. the gamma voltage) is used as the gray scale voltage of the binding point gray scale.
Fig. 6 is a schematic structural diagram of another display driving device according to an embodiment of the present invention. Referring to fig. 6, in one embodiment, the first voltage dividing circuit 210 and the second voltage dividing circuit 220 include m voltage dividing resistors in total, a first terminal of the 1 st voltage dividing resistor is connected to the first reference voltage output terminal, and a second terminal of the m-th voltage dividing resistor is connected to the third reference voltage terminal.
The gray scale voltage generating module 20 further includes m-1 first switches and m second switches, among the first voltage dividing circuit 210 and the second voltage dividing circuit 220, the j-1 first switches are connected between the j-1 voltage dividing resistor and the j-1 voltage dividing resistor, the second ends of the k-1 voltage dividing resistor and the k-1 voltage dividing resistor are connected with the first ends of the k-1 second switches, the second ends of the m-th voltage dividing resistor are connected with the first ends of the m-th second switches, the second ends of the second switches are all connected with the second reference voltage output end, j is greater than or equal to 2 and less than or equal to m, and k is greater than or equal to 2 and less than or equal to m-1.
The x-th first switch is in an off state, the rest of the first switches are in an on state, the x-th second switch is in an on state, and the rest of the second switches are in an off state, wherein x is more than or equal to 1 and less than or equal to m-1.
Illustratively, when m=1024, the first voltage dividing circuit 210 and the second voltage dividing circuit 220 include 1024 voltage dividing resistors in total, denoted as r1 to r1024. The gray scale voltage generating module 20 includes 1023 first switches K1-1 to K1-1023, and 1024 second switches K2-1 to K2-1024.
With continued reference to fig. 6, on the basis of the above embodiments, the binding point gray scale group includes n binding point gray scales, the first voltage dividing circuit 210 generates gray scale voltages corresponding to the first i binding point gray scales according to the first reference voltage VGMP1 and the second reference voltage VGMP2, and the second voltage dividing circuit 220 generates gray scale voltages corresponding to the i+1th to n binding point gray scales according to the second reference voltage VGMP2 and the third reference voltage VGSP. The magnitude of the second reference voltage VGMP2 is related to the gray-scale voltage corresponding to the (i+1) th binding point gray-scale under the preset display brightness level, and the magnitude of the first reference voltage VGMP1 is related to the gray-scale voltage corresponding to the 1 st binding point gray-scale under the preset display brightness level. The gray scale voltage corresponding to the 1 st binding point gray scale under the preset display brightness level is the maximum gray scale voltage.
Preferably, the gray-scale voltage corresponding to the 1 st binding point gray scale under the preset display brightness level is equal to the sum of the gray-scale voltage debugging value corresponding to the (i+1) th binding point gray scale under the preset display brightness level and the preset voltage value. Preferably, the power voltage AVDD is equal to a sum of the second reference voltage VGMP2 and a preset difference value.
Specifically, the luminance bar of the display panel is used to adjust the display luminance level, also referred to as the display luminance value (Display Brightness Value, DBV). Each display brightness level can correspond to one display brightness of the maximum gray level in the display panel, and after the display brightness corresponding to the maximum gray level in the display panel is changed, the display brightness corresponding to other gray levels is also changed. The preset display brightness level may be the lowest display brightness level, corresponding to a display brightness level of 2nit where the brightness bar is at the darkest brightness position.
Hereinafter, a gamma debugging process by the display driving apparatus will be described by taking i=1 and m=1024 as an example. The 1 st binding point gray level in the n binding point gray levels is 0 gray level, the 2 nd binding point gray level is 1 gray level, the n th binding point gray level is 255 gray level, and the 3 rd to n-1 th binding point gray levels can be any display gray level in the 1 st gray level to 255 gray levels. In one embodiment, the lower the display gray scale, the higher the corresponding gray scale voltage. The display picture corresponding to the 0 gray scale is a black picture, and the gray scale voltage corresponding to the 0 gray scale is also called black state voltage, and the black state voltage is larger than the gray scale voltages corresponding to other display gray scales under the condition that the display brightness levels are the same. When the preset display brightness level is the lowest display brightness level, the gray-scale voltage corresponding to the 1 st binding point gray-scale (i.e. 0 gray-scale) under the preset display brightness level is the maximum gray-scale 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, and the first reference voltage VGMP1 can be determined by determining the maximum black state voltage corresponding to the 1 st binding point gray scale.
Initial values of the power supply voltage AVDD and the first reference voltage VGMP1 may be preset according to the maximum value of the black state voltages of the display devices of the same production lot. For example, the initial value of the power supply voltage AVDD is set to 7.7V, and the initial value of the first reference voltage VGMP1 is set to 7.4V. On the basis, the gray scale voltage corresponding to the gray scale of each binding point under the preset display brightness level is debugged. Firstly, the gray scale voltage corresponding to the gray scale of the (i+1) th binding point, namely the gray scale voltage corresponding to the gray scale of the (2) th binding point, namely the gray scale voltage corresponding to the 1 gray scale is debugged. Because the black picture is displayed in 0 gray scale, the brightness is not available, and the debugging is inconvenient, the gray scale voltage corresponding to 0 gray scale can be obtained on the basis of the gray scale voltage corresponding to 1 gray scale. For example, when the gray scale voltage v2=7.1v corresponding to 1 gray scale at the preset display brightness level, the gray scale voltage v1=v2+v0 corresponding to 0 gray scale, where V0 represents the preset voltage value, and the magnitude of V0 can be set according to the actual parameters of the display panel, in this embodiment, v0=0.3v is taken, v1=7.4v is taken, 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 controlled to be turned off, and the first switches K1-1 to K1-1023 are controlled to be turned on.
According to the gray-scale voltage V1 corresponding to the 1 st binding point gray scale (0 gray scale) and the gray-scale voltage V2 corresponding to the 2 nd binding point gray scale (1 gray scale), the corresponding positions of the gray-scale voltages V1 and V2 in the first voltage dividing circuit 210 and the second voltage dividing circuit 220 are determined. The gray-scale voltage V1 corresponds to the voltage at the second end of the voltage dividing resistor r1, and the gray-scale voltage V2 corresponds to the voltage at the second end of the voltage dividing resistor rx. According to the gray scale voltage V2 corresponding to the 2 nd binding point gray scale under 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 booster circuit 121 is equal to the gray scale voltage V2 or is close to the gray scale voltage V2. Based on this, the x-th first switch K1-x is controlled to be turned off, the rest of the first switches are turned on, the x-th second switch K2-x is turned on, and the rest of the second switches are turned off, so that the gray scale voltage V1 corresponding to the gray scale of the 1 st binding point is generated by the first voltage dividing circuit 210 according to the first reference voltage VGMP1 and the second reference voltage VGMP2, and the gray scale voltages V2 to Vn corresponding to the gray scale of the 2 nd to n-th binding points are generated by the second voltage dividing circuit 220 according to the second reference voltage VGMP2 and the third reference voltage VGSP.
Since the initial value of the first reference voltage VGMP1 and the gray-scale voltage V1 corresponding to the 1 st binding point gray-scale are both 7.4V, the first reference voltage VGMP1 may remain unchanged at 7.4V. The debug value of the gray scale voltage V2 corresponding to the gray scale of the 2 nd binding point under the preset display brightness level is 7.1V, the second reference voltage VGMP2 is approximately 7.1V, when the preset difference Δv=0.3v, the power voltage AVDD can be changed from 7.7V to 7.1v+0.3v=7.4v, so as to satisfy AVDD-VGMP2 not less than Δv, and ensure the stability of the second reference voltage VGMP2 output by the second boost circuit 121. Because |avdd-vgmp1| < Δv, although the stability of the first reference voltage VGMP1 output by the first voltage boosting circuit 111 is not ideal, the first reference voltage VGMP1 only affects the accuracy of the gray scale voltage V1 of 0 gray scale, the display screen corresponding to 0 gray scale is a black screen, the display screen has no brightness, the human eyes have difficulty in observing the brightness deviation under the black screen, so that the stability of the first reference voltage VGMP1 affects less on the display effect of 0 gray scale, and the stability of the second reference voltage VGMP2 is higher, so that the accuracy of the gray scale voltages corresponding to the 2 nd to n th binding points is higher, the display effect of the gray scales of other binding points can be ensured, and the display effect of the gray scales of all the binding points is ensured. Meanwhile, the power supply voltage AVDD is changed from 7.7V to 7.4V, and compared with the prior art, the power supply voltage AVDD can be reduced by 0.3V, so that the purpose of saving power consumption is achieved.
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 driving device are determined. On the basis, gamma debugging of the gray scales of the other binding points under the preset display brightness level can be continuously performed, and gamma debugging of the gray scales of all the binding points under other display brightness levels can be continuously performed.
In summary, when the display driving device provided by the embodiment of the invention is applied to a display device, the power consumption of the display device can be reduced, so that the standby time of the display device is prolonged, and the display effect of the display device is ensured.
Based on the same inventive concept, the embodiments of the present invention further provide a display device, which includes a display panel and the display driving device in any of the foregoing embodiments, so that the display device has a corresponding functional structure and beneficial effects of the display driving device, which are not described herein again. The display panel can be an OLED display panel or a Micro-LED display panel. The display device may be a mobile phone or any electronic product with a display function, including but not limited to the following categories: television, notebook computer, desktop display, tablet computer, digital camera, smart bracelet, smart glasses, vehicle-mounted display, medical equipment, industrial control equipment, touch interactive terminal, etc., which are not particularly limited in this embodiment of the invention.
Based on the same inventive concept, the embodiments of the present invention also provide a display driving method, which may be performed by the display driving apparatus in any of the above embodiments. Fig. 7 is a schematic flow chart of a display driving method according to an embodiment of the invention. With reference to figure 7 of the drawings, the method specifically comprises the following steps:
s110, generating a first reference voltage and a second reference voltage according to a power supply voltage, wherein the first reference voltage is larger than the second reference voltage, the difference value of the power supply voltage and the second reference voltage is larger than or equal to a preset difference value, and the difference value of the power supply voltage and the first reference voltage is smaller than the preset difference value.
S120, generating gray scale voltages corresponding to at least one binding point gray scale in the binding point gray scale group according to the first reference voltage and the second reference voltage.
S130, generating gray scale voltages corresponding to the gray scales of the rest binding points in the binding point gray scale group according to the second reference voltage and the third reference voltage.
According to the technical scheme, the reference voltage generating module generates the first reference voltage and the second reference voltage according to the power voltage input by the power voltage end, the first reference voltage is larger than the second reference voltage, the difference value between the power voltage and the second reference voltage is larger than or equal to the preset difference value, and the difference value between the power voltage and the first reference voltage is smaller than the preset difference value, so that the stability of the second reference voltage generated by the reference voltage generating module is higher than that of the first reference voltage, the power voltage is reduced, and the power consumption of the display driving device is reduced. The gray scale voltage generating module generates the gray scale voltage corresponding to at least one binding point gray scale in the binding point gray scale group according to the first reference voltage and the second reference voltage, and generates the gray scale voltages corresponding to the rest binding point gray scales in the binding point gray scale group according to the second reference voltage and the third reference voltage, so that the accuracy of the gray scale voltages generated by the gray scale voltage generating module according to the second reference voltage and the third reference voltage is higher than that of the gray scale voltages generated by the gray scale voltage generating module according to the first reference voltage and the second reference voltage, and under the condition that the corresponding binding point gray scale is lower, the stability of the first reference voltage has smaller influence on the display effect of the part of the binding point gray scales, and the stability of the second reference voltage is higher, so that the display effect of the rest binding point gray scales can be ensured, and the display effect of all the binding point gray scales can be ensured. When the display driving device is applied to the display device, the technical scheme of the embodiment of the invention not only can reduce the power consumption of the display device, thereby prolonging the standby time of the display device, but also is helpful for ensuring the display effect of the display device.
Optionally, step S110 specifically includes:
converting the reference voltage according to the power supply voltage to obtain a first reference voltage; and converting the reference voltage according to the power supply voltage to obtain a second reference voltage.
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, including: and boosting the reference voltage according to the power supply voltage to obtain a second reference voltage.
Optionally, step S120 includes:
dividing a voltage between the first reference voltage and the second reference voltage, obtaining gray scale voltages corresponding to at least one binding point gray scale in the binding point gray scale group;
step S130 includes:
and dividing the voltage between the second reference voltage and the third reference voltage to obtain gray scale voltages corresponding to the gray scales of the rest binding points in the binding point gray scale group.
Optionally, on the basis of the foregoing embodiment, the first voltage dividing circuit and the second voltage dividing circuit in the display driving device include m voltage dividing resistors altogether, a first end of the 1 st voltage dividing resistor is connected to the first reference voltage output end, and a second end of the m th voltage dividing resistor is connected to the third reference voltage output end; the gray level voltage generation module further comprises m-1 first switches and m second switches, wherein the j-1 first switches are connected between the j-1 voltage dividing resistors and the j-1 first switches, the second ends of the k-1 voltage dividing resistors and the first ends of the k-1 second switches are connected with the first ends of the k-1 second switches, the second ends of the m-th voltage dividing resistors are connected with the first ends of the m-th second switches, the second ends of the second switches are all connected with the second reference voltage output ends, j is more than or equal to 2 and less than or equal to m, and k is more than or equal to 2 and less than or equal to m-1;
The display driving method further includes:
the x-th first switch is controlled to be in an off state, the rest of the first switches are controlled to be in an on state, the x-th second switch is controlled to be in an on state, and the rest of the second switches are controlled to be in an off state, wherein x is more than or equal to 1 and less than or equal to m-1.
It should be appreciated that various forms of the flows shown above may be used to reorder, add, or delete steps. For example, the steps described in the present invention may be performed in parallel, sequentially, or in a different order, so long as the desired results of the technical solution of the present invention are achieved, and the present invention is not limited herein.
The above embodiments do not limit the scope of the present invention. It will be apparent to those skilled in the art that various modifications, combinations, sub-combinations and alternatives are possible, depending on design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of the present invention.

Claims (10)

1. A display driving apparatus, comprising:
the reference voltage generation module is connected with a power supply voltage end and is used for generating a first reference voltage and a second reference voltage according to the power supply voltage input by the power supply voltage end, wherein the first reference voltage is larger than the second reference voltage, the difference value between the power supply voltage and the second reference voltage is larger than or equal to a preset difference value, and the difference value between the power supply voltage and the first reference voltage is smaller than the preset difference value;
The gray scale voltage generation module is connected with the reference voltage generation module and a third reference voltage end, the third reference voltage input by the third reference voltage end is smaller than the second reference voltage, and the gray scale voltage generation module is used for generating gray scale voltages corresponding to at least one binding point gray scale in the binding point gray scale group according to the first reference voltage and the second reference voltage, and generating gray scale voltages corresponding to the rest binding point gray scales in the binding point gray scale group according to the second reference voltage and the third reference voltage.
2. The display driving device according to claim 1, wherein the binding point gray scale group includes n binding point gray scales, gray scale voltages corresponding to 1 st to n th binding point gray scales decrease in sequence, the gray scale voltage generation module generates gray scale voltages corresponding to the first i binding point gray scales according to the first reference voltage and the second reference voltage, and generates the gray scale voltages corresponding to the i+1th to n th binding point gray scales according to the second reference voltage and the third reference voltage, wherein i < n is greater than or equal to 1; preferably, i=1;
preferably, the 1 st binding point gray level is the lowest gray level.
3. The display driving device according to claim 2, wherein the second reference voltage is related to a gray-scale voltage corresponding to the (i+1) th binding point gray-scale at a preset display brightness level, and the first reference voltage is related to a gray-scale voltage corresponding to the (1) th binding point gray-scale at the preset display brightness level; the gray-scale voltage corresponding to the 1 st binding point gray-scale under the preset display brightness level is the maximum gray-scale voltage;
preferably, the gray-scale voltage corresponding to the 1 st binding point gray-scale under the preset display brightness level is equal to the sum of the gray-scale voltage debugging value corresponding to the i+1 th binding point gray-scale under the preset display brightness level and the preset voltage value;
preferably, the power supply voltage is equal to a sum of the second reference voltage and the preset difference value.
4. The display driving apparatus according to claim 1, wherein the reference voltage generating module comprises:
the first reference voltage generation unit is connected with a reference voltage end, the power supply voltage end and the gray scale voltage generation module and is used for converting the reference voltage input by the reference voltage end according to the power supply voltage to obtain a first reference voltage;
And the second reference voltage generating unit is connected with the reference voltage end, the power supply voltage end and the gray scale voltage generating module and is used for converting the reference voltage according to the power supply voltage to obtain a second reference voltage.
5. The display driving device according to claim 4, wherein the first reference voltage generating unit includes a first booster circuit, a first resistor, and a second resistor;
the first input end of the first voltage boosting circuit is connected with the reference voltage end, the second input end of the first voltage boosting circuit is connected with the first end of the first resistor and the first end of the second resistor, the first power end of the first voltage boosting circuit is connected with the power voltage end, the output end of the first voltage boosting circuit serves as a first reference voltage output end, the second end of the first resistor is connected with the output end of the first voltage boosting circuit, the second power end of the first voltage boosting circuit and the second end of the second resistor are grounded, and the first voltage boosting circuit is used for boosting the reference voltage according to the power voltage to obtain a first reference voltage.
6. The display driving device according to claim 4, wherein the second reference voltage generating unit includes a second booster circuit, a third resistor, and a fourth resistor;
The first input end of the second voltage boosting circuit is connected with the reference voltage end, the second input end of the second voltage boosting circuit is connected with the third resistor and the first end of the fourth resistor, the first power end of the second voltage boosting circuit is connected with the power voltage end, the output end of the second voltage boosting circuit serves as a second reference voltage output end, the second end of the third resistor is connected with the output end of the second voltage boosting circuit, the second power end of the second voltage boosting circuit and the second end of the fourth resistor are grounded, and the second voltage boosting circuit is used for boosting the reference voltage according to the power voltage to obtain a second reference voltage.
7. The display driving apparatus according to any one of claims 1 to 6, wherein the gray scale voltage generating module includes:
the first voltage dividing circuit is connected with a first reference voltage output end and a second reference voltage output end of the reference voltage generating module and is used for dividing the voltage between the first reference voltage and the second reference voltage so as to obtain gray scale voltages corresponding to at least one binding point gray scale in the binding point gray scale group;
the second voltage dividing circuit is connected with the second reference voltage output end and the third reference voltage end and is used for dividing the voltage between the second reference voltage and the third reference voltage so as to obtain gray scale voltages corresponding to the gray scales of the other binding points in the binding point gray scale group;
Preferably, the first voltage dividing circuit includes a plurality of voltage dividing resistors connected in series between the first reference voltage output terminal and the second reference voltage output terminal, the second voltage dividing circuit includes a plurality of voltage dividing resistors connected in series between the second reference voltage output terminal and the third reference voltage output terminal, and at least one end of each voltage dividing resistor is used as a voltage dividing terminal, so that the voltage of the corresponding voltage dividing terminal is used as the gray scale voltage of the binding point gray scale.
8. The display driving device according to claim 7, wherein the first voltage dividing circuit and the second voltage dividing circuit include m voltage dividing resistors in total, a first end of a 1 st voltage dividing resistor is connected to the first reference voltage output terminal, and a second end of an m-th voltage dividing resistor is connected to the third reference voltage output terminal;
the gray scale voltage generation module further comprises m-1 first switches and m second switches, wherein j-1 first switches are connected between the j-1 voltage dividing resistor and the j-1 voltage dividing resistor, the second end of the k-1 voltage dividing resistor and the first end of the k-1 voltage dividing resistor are connected with the first end of the k-1 second switches, the second end of the m-1 voltage dividing resistor is connected with the first end of the m-th second switches, the second ends of the second switches are all connected with the second reference voltage output end, and j is more than or equal to 2 and less than or equal to m, and k is more than or equal to 2 and less than or equal to m-1;
The x-th first switch is in an off state, the rest of the first switches are in an on state, the x-th second switch is in an on state, and the rest of the second switches are in an off state, wherein x is more than or equal to 1 and less than or equal to m-1.
9. A display driving method, characterized by comprising:
generating a first reference voltage and a second reference voltage according to a power supply voltage, wherein the first reference voltage is larger than the second reference voltage, the difference value between the power supply voltage and the second reference voltage is larger than or equal to a preset difference value, and the difference value between the power supply voltage and the first reference voltage is smaller than the preset difference value;
generating gray scale voltages corresponding to at least one binding point gray scale in a binding point gray scale group according to the first reference voltage and the second reference voltage, and generating gray scale voltages corresponding to the rest binding point gray scales in the binding point gray scale group according to the second reference voltage and the third reference voltage.
10. A display device comprising a display panel and further comprising the display driving device according to any one of claims 1 to 8.
CN202310443364.6A 2023-04-23 2023-04-23 Display driving device, display driving method and display device Pending CN116453462A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117316106A (en) * 2023-11-29 2023-12-29 禹创半导体(深圳)有限公司 OLED (organic light emitting diode) fast switching GAMMA circuit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117316106A (en) * 2023-11-29 2023-12-29 禹创半导体(深圳)有限公司 OLED (organic light emitting diode) fast switching GAMMA circuit

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