CN114170961B - Display driving device, system and method - Google Patents
Display driving device, system and method Download PDFInfo
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- CN114170961B CN114170961B CN202111523547.6A CN202111523547A CN114170961B CN 114170961 B CN114170961 B CN 114170961B CN 202111523547 A CN202111523547 A CN 202111523547A CN 114170961 B CN114170961 B CN 114170961B
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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]
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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]
- G09G3/3275—Details of drivers for data electrodes
- G09G3/3291—Details of drivers for data electrodes in which the data driver supplies a variable data voltage for setting the current through, or the voltage across, the light-emitting elements
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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
- 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
Abstract
The application relates to a display driving device, a system and a method. The device comprises: the voltage setting module is used for receiving the brightness adjusting signal, determining a target dimming mode of the display module, determining a power supply voltage target value based on the target dimming mode and sending the power supply voltage target value to the power supply management chip; and the driving module is used for generating a data voltage signal for driving the display module according to the target dimming mode when the power management chip provides power voltage according to the power voltage target value so as to control the brightness of the display module. The device can reduce the power consumption of the DDIC.
Description
Technical Field
The present disclosure relates to display technologies, and in particular, to a display driving apparatus, a display driving system and a display driving method.
Background
With the development of science and technology, the requirements of users on display screens are higher and higher. Not only the image quality is high, but also the brightness uniformity is good and the whole is free from flicker.
In the conventional technology, a DDIC (Display Driver Integrated Circuit) employs PWM (Pulse Width Modulation) dimming at low luminance and DC (Direct Current) dimming at high luminance.
However, power consumption of DDICs is currently high.
Disclosure of Invention
In view of the above, it is desirable to provide a display driving apparatus, a system and a method capable of reducing power consumption of a DDIC.
According to an aspect of the present application, there is provided a display driving apparatus, the apparatus including:
the voltage setting module is used for receiving the brightness adjusting signal, determining a target dimming mode of the display module, determining a power supply voltage target value based on the target dimming mode and sending the power supply voltage target value to the power supply management chip;
and the driving module is used for generating a data voltage signal for driving the display module according to the target dimming mode when the power management chip provides power voltage according to the power voltage target value so as to control the brightness of the display module.
In the display driving device, the voltage setting module receives the brightness adjusting signal, determines a target dimming mode of the display module, determines a power supply voltage target value based on the target dimming mode, and sends the power supply voltage target value to the power supply management chip, so that the power supply management chip can set the power supply voltage target value according to the dimming mode adopted by the display driving signal and inform the power supply management chip of the power supply voltage target value, and the power supply management chip can provide the power supply voltage according to the power supply voltage target value. At the moment, the driving module generates a data voltage signal for driving the display module according to the target dimming mode to control the brightness of the display module, so that the display driving chip is not influenced to control the display module to display images, and the power consumption of the display driving chip can be saved.
In one embodiment, the apparatus further comprises:
the at least two first registers are respectively connected with the voltage setting module, the at least two first registers correspond to various dimming modes of the display module one by one, and each first register stores a power supply voltage value;
the voltage setting module is configured to determine the first register corresponding to the target dimming mode, and obtain a power supply voltage value from the determined first register as the power supply voltage target value.
And a plurality of first registers are additionally arranged for respectively storing the power supply voltage target values corresponding to different dimming modes, so that after the target dimming mode of the display module is determined, the power supply voltage value stored in the corresponding first register is obtained and can be used as the power supply voltage target value. The target value of the power supply voltage can change along with the target dimming mode of the display module, so that the brightness of the display module can be adjusted, and the waste of power consumption can not be caused. And the target value of the power supply voltage is easy and convenient to obtain.
In one embodiment, the apparatus further comprises:
the second register is connected with the voltage setting module, and a set voltage value is stored in the second register;
the voltage setting module is further connected with the driving module, and is configured to obtain a maximum value of the gamma voltage from the driving module, obtain the set voltage value from the second register, and determine a sum of the maximum value of the gamma voltage and the set voltage value as the power supply voltage target value; wherein the gamma voltage is determined based on the target dimming manner and is used to generate the data voltage signal.
A second register is additionally arranged to store a set voltage value in advance, so that a target dimming mode of the display module is determined, and after the gamma voltage is determined based on the target dimming mode, the maximum value of the gamma voltage is added with the set voltage value to serve as a power supply voltage target value. The target value of the power supply voltage can change along with the target dimming mode of the display module, so that the brightness of the display module can be adjusted, and the waste of power consumption can not be caused. And the set and stored voltage values are less, and the realization cost is lower.
In one embodiment, the apparatus further comprises:
the switch is connected between the voltage setting module and the driving module in series;
the at least two first registers are respectively connected with the voltage setting module, the at least two first registers correspond to various dimming modes of the display module one by one, and each first register stores a power supply voltage value;
the voltage setting module is further configured to determine the first register corresponding to the target dimming mode when the switch is turned off, and obtain a power supply voltage value from the determined first register as the power supply voltage target value.
When the switch is closed, the voltage setting module is connected with the driving module, the maximum value of the gamma voltage can be obtained from the driving module, the set voltage value is obtained from the second register at the moment, and the sum of the maximum value of the gamma voltage and the set voltage value is determined as the target value of the power supply voltage. When the switch is disconnected, the voltage setting module is not connected with the driving module, the maximum value of the gamma voltage cannot be obtained from the driving module, the first register corresponding to the target dimming mode is determined at the moment, and the power supply voltage value is obtained from the determined first register and serves as the power supply voltage target value. And the mode of determining the target value of the power supply voltage is conveniently selected through the on-off of the switch.
In one embodiment, the target dimming mode is PWM dimming or DC dimming.
The power supply voltage AVDD required by PWM dimming and the power supply voltage AVDD required by DC dimming have larger difference, and can provide matched power supply voltage for the display driving chip according to whether the target dimming mode is PWM dimming or DC dimming, so that the generation of the required maximum gamma voltage VGMP by the display driving chip can not be influenced, and the power consumption of the display driving chip can be saved.
According to another aspect of the present application, a display driving system is provided, where the system includes a power management chip and the display driving apparatus of any of the above embodiments, and the voltage setting module and the driving module are respectively connected to the power management chip.
In the display driving system, the voltage setting module receives the brightness adjusting signal, determines the target dimming mode of the display module, determines the power supply voltage target value based on the target dimming mode, and sends the power supply voltage target value to the power supply management chip, and the voltage setting module can set the power supply voltage target value according to the dimming mode adopted by the display driving signal and inform the power supply management chip of the power supply voltage target value, so that the power supply management chip provides the power supply voltage according to the power supply voltage target value. At the moment, the driving module generates a data voltage signal for driving the display module according to the target dimming mode so as to control the brightness of the display module, the display driving chip is not influenced to control the display module to display images, and the power consumption of the display driving chip can be saved.
According to still another aspect of the present application, there is provided a display driving method, the method including:
receiving a brightness adjusting signal;
determining a target dimming mode of the display module based on the brightness adjusting signal;
determining a power supply voltage target value based on the target dimming mode, and sending the power supply voltage target value to a power supply management chip;
and when the power supply management chip provides power supply voltage according to the power supply voltage target value, generating a data voltage signal for driving the display module according to the target dimming mode so as to control the brightness of the display module.
In the display driving method, the brightness adjusting signal is received, the target dimming mode of the display module is determined, the target value of the power supply voltage is determined based on the target dimming mode and is sent to the power supply management chip, and the target value of the power supply voltage can be set according to the dimming mode adopted by the display driving signal and is informed to the power supply management chip, so that the power supply management chip provides the power supply voltage according to the target value of the power supply voltage. At the moment, the data voltage signal for driving the display module is generated according to the target dimming mode so as to control the brightness of the display module, the display driving chip is not influenced to control the display module to display images, and the power consumption of the display driving chip can be saved.
In one embodiment, the determining the target value of the power supply voltage based on the target dimming manner includes:
and acquiring a power supply voltage value corresponding to the target dimming mode as the power supply voltage target value, wherein each dimming mode of the display module has a corresponding power supply voltage value.
Each dimming mode of the display module corresponds to one power supply voltage value, and the power supply voltage value corresponding to the target dimming mode is obtained and serves as the power supply voltage target value, so that the power supply voltage target value can change along with the target dimming mode of the display module, brightness adjustment of the display module can be achieved, and waste of power consumption is avoided. And the target value of the power supply voltage is simple and convenient to obtain.
In one embodiment, the determining the target value of the power supply voltage based on the target dimming manner includes:
acquiring the maximum value and the set voltage value of the gamma voltage; wherein the gamma voltage is determined based on the target dimming manner and is used to generate the data voltage signal;
and determining the sum of the maximum value of the gamma voltage and the set voltage value as the power supply voltage target value.
The maximum value and the set voltage value of the gamma voltage are obtained, the gamma voltage is determined based on the target dimming mode, and then the maximum value of the gamma voltage is added with the set voltage value to be used as the target value of the power supply voltage. The target value of the power supply voltage can change along with the target dimming mode of the display module, so that the brightness of the display module can be adjusted, and the waste of power consumption can not be caused. And the set and stored voltage values are less, and the realization cost is lower.
In one embodiment, the determining a power supply voltage target value based on the target dimming manner further includes:
if the maximum value of the gamma voltage cannot be obtained, a power supply voltage value corresponding to the target dimming mode is obtained as the power supply voltage target value, and each dimming mode of the display module has a corresponding power supply voltage value.
If the maximum value of the gamma voltage cannot be obtained, a power supply voltage value corresponding to the target dimming mode is obtained as a power supply voltage target value, and the power supply voltage target value is ensured to be obtained.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments or the conventional technologies of the present application, the drawings used in the description of the embodiments or the conventional technologies will be briefly introduced below, it is obvious that the drawings in the description below are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a diagram illustrating an exemplary embodiment of a display driver;
FIG. 2 is a schematic diagram of a display driver according to an embodiment;
FIG. 3 is a flowchart illustrating a display driving method according to an embodiment.
Description of the reference numerals:
a display driver chip 100 is shown in a display driver chip,
an interface 10, a power module 20, a memory 30, a driving module 40,
a voltage setting module 101, a driving module 102, a first register 103, a second register 104, and a switch 105;
a power management chip 200;
a display module 300;
the application processor 400.
Detailed Description
To facilitate an understanding of the present application, the present application will now be described more fully with reference to the accompanying drawings. Embodiments of the present application are given in the accompanying drawings. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the present application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.
It will be understood that, as used herein, the terms "first," "second," and the like may be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one element from another.
Spatially relative terms, such as "under," "below," "beneath," "under," "above," "over," and the like, may be used herein to describe one element or feature's relationship to another element or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements or features described as "below" or "beneath" other elements or features would then be oriented "above" the other elements or features. Thus, the exemplary terms "under" and "under" can encompass both an orientation of above and below. In addition, the device may comprise additional orientations (e.g., rotated 90 degrees or other orientations) and the spatial descriptors used herein interpreted accordingly.
It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or be connected to the other element through intervening elements. Further, "connection" in the following embodiments is understood to mean "electrical connection", "communication connection", or the like, if there is a transfer of electrical signals or data between the connected objects.
As used herein, the singular forms "a", "an" and "the" may include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises/comprising," "includes" or "including," etc., specify the presence of stated features, integers, steps, operations, components, parts, or combinations thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof. Also, as used in this specification, the term "and/or" includes any and all combinations of the associated listed items.
As described in the background, the DDIC of the prior art has a problem of high power consumption. The application scenario and the working process of the DDIC will be briefly described below.
As shown in fig. 1, the display driver chip (DDIC) 100 includes an interface (interface) 10, a power module (power) 20, a Random Access Memory (RAM) 30, and a driver module 40, where the power module 20 and the Memory 30 are respectively connected to the interface 10, and the driver module 40 is respectively connected to the power module 20 and the Memory 30. The driving module 40 includes a Timing Controller (TCON), a source driver (source driver) or a data driver (data driver), and a Gate driver (Gate on Array, GOA).
The DDIC 100 is connected to a Power Integrated Circuit (Power management chip) 200, a Panel (display Panel or display module) 300, and an Application Processor (AP) 400, respectively. Power IC 200 provides supply voltage AVDD for DDIC 100. The power module 20 receives the power voltage AVDD through the interface 10 and generates the minimum gamma voltage VGSP and the maximum gamma voltage VGMP to the driving module 40.
When displaying an image, AP 400 inputs data of the display image to DDIC 100. Data is input into the DDIC 100 through the interface 10, and may be directly stored in the memory 30, or the data may be compressed first and then stored in the memory 30. The driving module 40 calls the data in the memory 30 to perform compensation (demura) and gamma correction (gamma), generates a data voltage between the minimum gamma voltage VGSP and the maximum gamma voltage VGMP according to the obtained data, and drives the Panel 300 to display an image.
When the brightness is adjusted, if PWM dimming is adopted, the minimum gamma voltage VGSP and the maximum gamma voltage VGMP are subjected to pulse modulation, and then the data voltage with the corresponding duty ratio is obtained. If the DC dimming is adopted, the voltage magnitudes of the minimum gamma voltage VGSP and the maximum gamma voltage VGMP are changed, and then the data voltage with the corresponding magnitudes is obtained.
The number of pulses (pulse) in the DC dimming is one, and the number of pulses in the PWM dimming is plural. The larger the number of pulses in PWM dimming, the weaker the flicker feeling of the display screen, and the better the use feeling. In order to ensure that the display screen has better use feeling, the number of pulse numbers during PWM dimming can be set to 32 at present, and the difference between the number of pulse numbers during DC dimming is more. Since the larger the number of pulses, the higher the required maximum gamma voltage VGMP during PWM dimming than the required maximum gamma voltage VGMP during DC dimming, as shown in table one below:
watch 1
In the related art, the DDIC sends a switch signal to the Power IC, where the switch signal carries the number of pulses set by PWM dimming. The Power IC provides Power supply voltage AVDD for the DDIC according to the maximum gamma voltage VGMP required during PWM dimming based on the pulse number set by PWM dimming in the switch signal. Based on the power supply voltage AVDD, DDIC can generate a large maximum gamma voltage VGMP during PWM dimming and a small maximum gamma voltage VGMP during DC dimming.
However, the supply voltage AVDD provided in this way is high, and the maximum gamma voltage VGMP required for DC dimming can be generated based on the low supply voltage AVDD, which causes high power consumption of the DDIC.
Based on the reasons, the invention provides a display driving device, a display driving system and a display driving method. The power management chip provides power voltage for the display driving chip according to the power voltage target value, and the display driving chip generates a data voltage signal for driving the display module according to the target dimming mode so as to control the brightness of the display module. Therefore, the power management chip provides the matched power supply voltage for the display driving chip according to the dimming mode adopted by the display driving chip, the maximum gamma voltage VGMP required by the generation of the display driving chip is not influenced, and the power consumption of the display driving chip can be saved.
The display driving apparatus, system and method provided by the present invention are suitable for various display apparatuses, including but not limited to OLED (Organic Light-Emitting Diode) display screens, such as PMOLED (Passive matrix OLED) display screens, AMOLED (Active-matrix Organic Light-Emitting Diode) display screens. The display driving device, the display driving system and the display driving method are also suitable for terminal equipment with the display device, such as electronic equipment such as mobile phones and tablet computers.
For ease of understanding, some concepts are described below:
the Display Driver Integrated Circuit (DDIC) mainly functions to control the Display module to Display images.
The Power management chip, power Integrated Circuit, abbreviated as Power IC, provides a supply voltage AVDD for the DDIC based on the requirements of the DDIC.
And PWM dimming is used for changing the brightness of the display screen by adjusting the proportion of alternately bright and dark of the display screen.
And DC dimming, wherein the brightness of the display screen is changed by using the power of the lifting circuit.
In one embodiment, as shown in fig. 2, there is provided a display driving apparatus including: a voltage setting module 101 and a driving module 102. The voltage setting module 101 is configured to receive the brightness adjustment signal, determine a target dimming mode of the display module, determine a power supply voltage target value based on the target dimming mode, and send the power supply voltage target value to the power management chip 200. The driving module 102 is configured to generate a data voltage signal for driving the display module according to a target dimming manner when the power management chip 200 provides a power voltage according to a power voltage target value, so as to control the brightness of the display module.
In the display driving apparatus, the voltage setting module 101 receives the brightness adjustment signal, determines a target dimming mode of the display module, determines a power voltage target value based on the target dimming mode, and sends the power voltage target value to the power management chip 200, so that the power management chip 200 can set the power voltage target value according to the dimming mode adopted by the display driving signal and inform the power management chip 200 of the power voltage target value, so that the power management chip 200 provides the power voltage according to the power voltage target value. At this time, the driving module 102 generates a data voltage signal for driving the display module according to the target dimming manner to control the brightness of the display module, which does not affect the display driving chip 100 to control the display module to display the image, and can also save the power consumption of the display driving chip 100.
Illustratively, the target dimming manner is PWM dimming or DC dimming.
The difference between the power supply voltage AVDD required for PWM dimming and the power supply voltage AVDD required for DC dimming is large, and the power supply voltage can be provided for the display driver chip 100 according to whether the target dimming mode is PWM dimming or DC dimming, so that the generation of the required maximum gamma voltage VGMP by the display driver chip 100 is not influenced, and the power consumption of the display driver chip 100 can be saved.
In practical applications, the brightness adjustment signal is sent from the application processor to the display driver chip 100.
Illustratively, the application processor is provided with a human-computer interaction interface, such as a brightness bar for providing brightness adjustment, and the target brightness can be set by adjusting the position of a light spot on the brightness bar by a user. The application processor carries the target brightness set by the user in brightness adjustment and sends the target brightness to the display driver chip 100.
In one embodiment, the brightness adjustment signal carries a target brightness of the display module.
Accordingly, the voltage setting module 101 is configured to obtain the target brightness of the display module from the brightness adjustment signal, and determine the target dimming mode of the display module based on the target brightness of the display module.
Specifically, the voltage setting module 101 is configured to determine that the target dimming manner is PWM dimming when the target brightness is less than the brightness threshold; when the target brightness is greater than or equal to the brightness threshold, the target dimming manner is determined to be DC dimming.
For example, when the luminance value DBV =3500 is larger than the luminance threshold, the target dimming method is PWM dimming, and the corresponding power supply voltage target value AVDD =6.9V. For example, when the brightness value DBV =100 is smaller than the brightness threshold, the target dimming mode is DC dimming, and the corresponding power supply voltage target value AVDD =7.6V.
In one embodiment, as shown in fig. 2, the apparatus further comprises at least two first registers 103. The at least two first registers 103 are respectively connected to the voltage setting module 101. The at least two first registers 103 correspond to various dimming modes of the display module one to one. Each of the first registers 103 stores therein a power supply voltage value.
Accordingly, the voltage setting module 101 is configured to determine the first register 103 corresponding to the target dimming mode, and obtain the power supply voltage value from the determined first register 103 as the power supply voltage target value.
The plurality of first registers 103 are additionally arranged to store the power supply voltage target values corresponding to different dimming modes respectively, so that after the target dimming mode of the display module is determined, the power supply voltage value stored in the corresponding first register 103 is obtained and can be used as the power supply voltage target value. The target value of the power supply voltage can change along with the target dimming mode of the display module, so that the brightness of the display module can be adjusted, and the waste of power consumption can not be caused. And the target value of the power supply voltage is simple and convenient to obtain.
For example, the target values AVDD of the power supply voltage stored in the first register 103 corresponding to different dimming modes are as shown in the following table two:
watch two
| Light modulation mode | AVDD |
| DC dimming | 6.9 |
| PWM dimming | 7.6 |
Assuming that the operating current of the display driver chip is 30mA, the power consumption of the display driver chip in the related art during DC dimming is 7.6v 30ma =228mw, and the power consumption of the display driver chip in this embodiment during DC dimming is 6.9v 30ma =207mw, which saves the power consumption of the display driver chip by about 20 mw.
In one embodiment, as shown in FIG. 2, the apparatus further comprises a second register 104. The second register 104 is connected to the voltage setting module, and the second register 104 stores a set voltage value.
Accordingly, the voltage setting module 101 is further connected to the driving module 102, and is configured to obtain the maximum value of the gamma voltage from the driving module 102, obtain the set voltage value from the second register 104, and determine the sum of the maximum value of the gamma voltage and the set voltage value as the power supply voltage target value. Wherein the gamma voltage is determined based on the target dimming manner and is used to generate the data voltage signal.
A second register 104 is additionally provided for storing a preset voltage value in advance, so as to determine a target dimming mode of the display module, and after the gamma voltage is determined based on the target dimming mode, the maximum value of the gamma voltage is added with the preset voltage value to be used as a power supply voltage target value. The target value of the power supply voltage can change along with the target dimming mode of the display module, so that the brightness of the display module can be adjusted, and the waste of power consumption can not be caused. And the set and stored voltage values are less, and the realization cost is lower.
Illustratively, the set voltage value is 0.2V to 0.7V.
Illustratively, the power supply voltage target values AVDD corresponding to the maximum values VGMP of the different gamma voltages are shown in table three below:
watch III
| VGMP | AVDD | Light modulation mode | Set voltage value |
| 6.5 | 6.8 | DC dimming | 0.3 |
| 6.3 | 6.6 | DC dimming | 0.3 |
| 7.3 | 7.6 | PWM dimming | 0.3 |
| 7.2 | 7.5 | PWM dimming | 0.3 |
Illustratively, as shown in FIG. 2, the apparatus further includes a switch 105. The switch 105 is connected in series between the voltage setting module 101 and the driving module 102.
Accordingly, the voltage setting module 101 is further configured to determine the first register 103 corresponding to the target dimming mode when the switch 105 is turned off, and obtain the power supply voltage value from the determined first register 103 as the power supply voltage target value.
When the switch 105 is closed, the voltage setting module 101 is connected to the driving module 102, and may obtain the maximum value of the gamma voltage from the driving module, at this time, obtain the set voltage value from the second register 104, and determine the sum of the maximum value of the gamma voltage and the set voltage value as the power supply voltage target value. When the switch 105 is turned off, the voltage setting module 101 is not connected to the driving module 102, and the maximum value of the gamma voltage cannot be obtained from the driving module 102, at this time, the first register 103 corresponding to the target dimming mode is determined, and the power supply voltage value is obtained from the determined first register 103 as the power supply voltage target value. By switching the switch 105 on and off, it is convenient to select the way of determining the target value of the supply voltage.
Further, the voltage setting module 101 is further configured to store the set voltage value in the second register 104 when the switch 105 is turned off.
When the switch 105 is turned off, the enable signal is 0, and the set voltage value may be stored in the second register 104. When the switch 105 is closed, the enable signal is 1, and the set voltage value can be read from the second register 104.
In one embodiment, the voltage setting module 101 is configured to convert the power voltage target value into an equivalent pulse number; the equivalent number of pulses is carried in the switch signal and sent to the power management chip 200.
In the related art, the pulse number set by PWM dimming is carried in a switch signal and is sent to a power management chip, so that the power management chip provides a power voltage corresponding to the pulse number carried in the switch signal. The target value of the power supply voltage is converted into the equivalent pulse number, and the equivalent pulse number is carried in the switch signal and sent to the power supply management chip, so that the power supply management chip can provide the power supply voltage corresponding to the equivalent pulse number, namely, the power supply voltage is provided according to the target value of the power supply, the related technology is not required to be changed, and the method is simple and convenient to implement and low in cost.
In one embodiment, the driving module 102 is configured to adjust a duty ratio of the data voltage signal according to a target brightness when the target dimming mode is PWM dimming; when the target dimming mode is DC dimming, the voltage magnitude of the data voltage signal is adjusted according to the target brightness.
Based on the same inventive concept, in one embodiment, as shown in fig. 2, there is provided a display driving system including: in any of the above embodiments, the display driving apparatus 100 and the power management chip 200, the voltage setting module 101 and the driving module 102 are respectively connected to the power management chip 200.
Based on the same inventive concept, in one embodiment, as shown in fig. 3, there is provided a display driving method including:
in step S201, a brightness adjustment signal is received.
Step S202, determining a target dimming mode of the display module based on the brightness adjustment signal.
And step S203, determining a power supply voltage target value based on the target dimming mode, and sending the power supply voltage target value to a power supply management chip.
Step S204, when the power management chip provides the power voltage according to the power voltage target value, a data voltage signal for driving the display module is generated according to the target dimming mode so as to control the brightness of the display module.
Illustratively, the brightness adjustment signal carries a target brightness of the display module, and the target dimming mode is PWM dimming or DC dimming.
In one embodiment, this step 202 includes: when the target brightness is smaller than the brightness threshold, determining that the target dimming mode is PWM dimming; and when the target brightness is larger than or equal to the brightness threshold value, determining the target dimming mode as DC dimming.
In one embodiment, this step S203 includes: and acquiring a power supply voltage value corresponding to the target dimming mode as a power supply voltage target value, wherein each dimming mode of the display module has a corresponding power supply voltage value.
In one embodiment, this step 203 comprises: acquiring a maximum value and a set voltage value of a gamma voltage, wherein the gamma voltage is determined based on a target dimming mode and is used for generating a data voltage signal; the sum of the maximum value of the gamma voltage and the set voltage value is determined as the power supply voltage target value.
Illustratively, this step 203 further includes: if the maximum value of the gamma voltage cannot be obtained, the power supply voltage value corresponding to the target dimming mode is obtained as the power supply voltage target value, and each dimming mode of the display module has a corresponding power supply voltage value.
In one embodiment, this step 204 includes: when the target dimming mode is PWM dimming, the duty ratio of the data voltage signal is adjusted according to the target brightness; when the target dimming mode is DC dimming, the voltage magnitude of the data voltage signal is adjusted according to the target brightness.
It should be understood that, although the steps in the flowchart of fig. 3 are shown in order as indicated by the arrows, the steps are not necessarily performed in order as indicated by the arrows. The steps are not limited to being performed in the exact order illustrated and, unless explicitly stated herein, may be performed in other orders. Moreover, at least a portion of the steps in fig. 3 may include multiple steps or multiple stages, which are not necessarily performed at the same time, but may be performed at different times, which are not necessarily performed in sequence, but may be performed in turn or alternately with other steps or at least a portion of the other steps or stages.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above may be implemented by hardware instructions of a computer program, which may be stored in a non-volatile computer-readable storage medium, and when executed, may include the processes of the embodiments of the methods described above. Any reference to memory, storage, database or other medium used in the embodiments provided herein can include at least one of non-volatile and volatile memory. Non-volatile Memory may include Read-Only Memory (ROM), magnetic tape, floppy disk, flash Memory, optical storage, or the like. Volatile Memory can include Random Access Memory (RAM) or external cache Memory. By way of illustration and not limitation, RAM can take many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM), among others.
In the description herein, references to the description of "some embodiments," "other embodiments," "desired embodiments," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, a schematic description of the above terminology may not necessarily refer to the same embodiment or example.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is specific and detailed, but not to be understood as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, and these are all within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A display driving apparatus, characterized in that the apparatus comprises:
the voltage setting module is used for receiving the brightness adjusting signal, determining a target dimming mode of the display module, determining a power supply voltage target value based on the target dimming mode and sending the power supply voltage target value to the power supply management chip;
the driving module is used for generating a data voltage signal for driving the display module according to the target dimming mode when the power supply management chip provides power supply voltage according to the power supply voltage target value so as to control the brightness of the display module;
the power voltage is used for driving the driving module, and the data voltage signal is used for driving the display module.
2. The apparatus of claim 1, further comprising:
the at least two first registers are respectively connected with the voltage setting module, the at least two first registers correspond to various dimming modes of the display module one by one, and each first register stores a power supply voltage value;
the voltage setting module is configured to determine the first register corresponding to the target dimming mode, and obtain a power supply voltage value from the determined first register as the power supply voltage target value.
3. The apparatus of claim 1, further comprising:
the second register is connected with the voltage setting module, and a set voltage value is stored in the second register;
the voltage setting module is further connected with the driving module, and is configured to obtain a maximum value of the gamma voltage from the driving module, obtain the set voltage value from the second register, and determine a sum of the maximum value of the gamma voltage and the set voltage value as the power supply voltage target value; wherein the gamma voltage is determined based on the target dimming manner and is used to generate the data voltage signal.
4. The apparatus of claim 3, further comprising:
the switch is connected between the voltage setting module and the driving module in series;
the at least two first registers are respectively connected with the voltage setting module, the at least two first registers correspond to various dimming modes of the display module one by one, and each first register stores a power supply voltage value;
the voltage setting module is further configured to determine the first register corresponding to the target dimming mode when the switch is turned off, and obtain a power supply voltage value from the determined first register as the power supply voltage target value.
5. The apparatus according to any one of claims 1 to 4, wherein the target dimming mode is PWM dimming or DC dimming.
6. A display driving system, comprising a power management chip and the display driving apparatus according to any one of claims 1 to 5, wherein the voltage setting module and the driving module are respectively connected to the power management chip.
7. A display driving method, the method comprising:
receiving a brightness adjusting signal;
determining a target dimming mode of the display module based on the brightness adjusting signal;
determining a power supply voltage target value based on the target dimming mode, and sending the power supply voltage target value to a power supply management chip;
when the power supply management chip provides power supply voltage according to the power supply voltage target value, generating a data voltage signal for driving the display module according to the target dimming mode so as to control the brightness of the display module;
the power voltage is used for driving the driving module, and the data voltage signal is used for driving the display module.
8. The method of claim 7, wherein determining a supply voltage target value based on the target dimming mode comprises:
and acquiring a power supply voltage value corresponding to the target dimming mode as the power supply voltage target value, wherein each dimming mode of the display module has a corresponding power supply voltage value.
9. The method of claim 7, wherein determining a supply voltage target value based on the target dimming mode comprises:
acquiring the maximum value and the set voltage value of the gamma voltage; wherein the gamma voltage is determined based on the target dimming manner and is used to generate the data voltage signal;
and determining the sum of the maximum value of the gamma voltage and the set voltage value as the power supply voltage target value.
10. The method of claim 9, wherein determining a supply voltage target value based on the target dimming manner further comprises:
if the maximum value of the gamma voltage cannot be obtained, a power supply voltage value corresponding to the target dimming mode is obtained as the power supply voltage target value, and each dimming mode of the display module has a corresponding power supply voltage value.
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| CN202650498U (en) * | 2012-07-02 | 2013-01-02 | 四川长虹电子系统有限公司 | Low energy consumption liquid crystal monitor |
| KR102579138B1 (en) * | 2015-11-11 | 2023-09-19 | 삼성디스플레이 주식회사 | Organic light emitting display device and driving method thereof |
| KR102552439B1 (en) * | 2016-05-09 | 2023-07-07 | 삼성디스플레이 주식회사 | Backlight unit, method of driving the same, and display device having the same |
| CN106304484B (en) * | 2016-08-22 | 2018-11-13 | 上海晶丰明源半导体股份有限公司 | Controllable silicon light modulation LED drive power and its dimming controlling method |
| EP3579045A4 (en) * | 2017-02-02 | 2020-08-26 | Toppan Printing Co., Ltd. | Dimmer device |
| CN109859721A (en) * | 2019-04-02 | 2019-06-07 | Oppo广东移动通信有限公司 | Brightness of display screen adjusting method, device, mobile terminal and storage medium |
| CN110164366A (en) * | 2019-04-22 | 2019-08-23 | 联想(北京)有限公司 | A kind of information processing method, electronic equipment |
| CN110769555A (en) * | 2019-11-25 | 2020-02-07 | 四川力士达智慧照明科技有限公司 | Multifunctional dimming control circuit |
| CN111210779B (en) * | 2020-01-08 | 2022-05-17 | 昆山龙腾光电股份有限公司 | Liquid crystal module and driving method |
| CN113674691B (en) * | 2021-08-30 | 2023-03-24 | 武汉华星光电半导体显示技术有限公司 | Display brightness adjusting method and adjusting device |
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