Drive Circuit, Display Device, and Power Supply Voltage Regulation Method

Abstract

The present invention discloses a driving circuit, a display device and a power supply voltage regulation method. The power supply voltage regulation method includes: obtaining the dynamic setting of the gamma voltage under different display parameters; obtaining the setting of the control pulse according to the dynamic setting of the gamma voltage; and controlling a power management circuit by the control pulse to generate a corresponding power supply voltage. Through the dynamic power supply voltage setting, the power supply voltage under different display parameters can be the lowest voltage required by the display module, thereby reducing power consumption.

Description

Technical Field

[0001] The present invention relates to the field of display technologies, and particularly to a driving circuit, a display device, and a power supply voltage regulation method. Background Art

[0002] With the development of display technologies and the wide application of display devices, Organic Electroluminance Display (OLED) devices are widely used in various display devices, such as smart phones, laptop computers, tablet computers, etc., due to their low power consumption, high response speed, and flexible performance.

[0003] The power consumption of a display driving integrated circuit chip is the main factor affecting its power consumption. Currently, the main power supply methods of OLED Display Driver Integrated Circuit (DDIC) chips are two types: 4 power supply voltages (AVDD / VDDI / VCI / DVDD) and 3 power supply voltages (AVDD / VDDI / VCI). The main source of the Gamma voltage provided to the display panel is generated from the AVDD voltage. The existing AVDD and Gamma voltages are set separately and do not interfere with each other. Therefore, a method for feedback regulating the AVDD voltage through the Gamma voltage provided to the display panel and thus reducing the power consumption of the display driving integrated circuit chip remains to be proposed. Summary of the Invention

[0004] In view of the above problems, an object of the present invention is to provide a driving circuit, a display device, and a power supply voltage regulation method, so as to solve the technical defects mentioned in the above background art.

[0005] According to one aspect of the present invention, a power supply voltage regulation method is provided, including:

[0006] Obtaining the dynamic setting of the Gamma voltage under different display parameters;

[0007] Obtaining the setting of a control pulse according to the dynamic setting of the Gamma voltage;

[0008] Controlling a power management circuit to generate a corresponding power supply voltage through the control pulse.

[0009] Preferably, the obtaining the setting of a control pulse according to the dynamic setting of the Gamma voltage includes:

[0010] Presetting control pulses of power supply voltages under different display parameters;

[0011] Back-calculating the setting of the control pulse according to the dynamic setting of the Gamma voltage.

[0012] Preferably, the setting of the control pulse according to the dynamic setting of the gamma voltage includes:

[0013] Determine the difference between the gamma voltage and the supply voltage;

[0014] Based on the difference between the gamma voltage and the supply voltage, inversely deduce the dynamic setting of the supply voltage, and then obtain the control pulse of the supply voltage.

[0015] Preferably, the display parameters include display brightness and display frequency.

[0016] Preferably, the supply voltage is the lowest voltage required by the display module under the display parameters.

[0017] Preferably, the setting of the control pulse inversely deduced according to the dynamic setting of the gamma voltage includes:

[0018] Based on the dynamic setting of the gamma voltage under different display parameters, obtain the corresponding gamma voltage;

[0019] Based on the display parameters characterized by the gamma voltage, obtain the setting of the control pulse.

[0020] According to another aspect of the present invention, there is provided a driving circuit, including:

[0021] A display driving circuit for performing display parameter statistics on the display panel it drives, obtaining the dynamic setting of the gamma voltage under different display parameters to drive the display panel, and obtaining the setting of the control pulse according to the dynamic setting of the gamma voltage;

[0022] A power management circuit connected to the display driving circuit, receiving the control pulse and generating a corresponding supply voltage.

[0023] Preferably, the display driving circuit includes:

[0024] A display parameter statistics module for performing display parameter statistics on the display panel and providing the display parameters to the gamma voltage determination module;

[0025] A gamma voltage determination module storing gamma voltage data, for determining the corresponding gamma voltage in the gamma voltage data according to the display parameters;

[0026] A supply voltage determination module for obtaining the setting of the control pulse according to the dynamic setting of the gamma voltage.

[0027] Preferably, the gamma voltage data includes dynamic gamma voltages corresponding to the display parameters respectively.

[0028] According to another aspect of the present invention, there is provided a display device, comprising:

[0029] a display panel, and the driving circuit described in any one of the above, wherein the display panel is one of a liquid crystal display panel, a micro light-emitting diode display panel, a mini light-emitting diode display panel, a quantum dot light-emitting diode display panel, and an organic light-emitting diode display panel.

[0030] The power supply voltage regulation method provided by the present invention enables the power supply voltage to be the lowest voltage required by the display module under different display modes and different display brightness levels through dynamic power supply voltage setting, thereby reducing power consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Through the following description of the embodiments of the present invention with reference to the accompanying drawings, the above and other objects, features, and advantages of the present invention will become more apparent. In the drawings:

[0032] FIG. 1 is a schematic structural diagram of a driving circuit driving a display panel provided by an embodiment of the present invention;

[0033] FIG. 2 is an internal structural diagram of a display driving circuit provided by an embodiment of the present invention;

[0034] FIG. 3 is a flowchart of a power supply voltage regulation method provided by an embodiment of the present invention;

[0035] FIG. 4 is a flowchart of specific steps in a power supply voltage regulation method provided by an embodiment of the present invention;

[0036] FIG. 5 is a flowchart of specific steps in a power supply voltage regulation method provided by another embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0037] The various embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. In each of the drawings, the same elements or modules are denoted by the same or similar reference numerals. For clarity, the various parts in the drawings are not drawn to scale.

[0038] It should be understood that in the following description, a "circuit" may include a single or multiple combined hardware circuits, programmable circuits, state machine circuits, and / or elements capable of storing instructions executed by a programmable circuit. When an element or circuit is referred to as being "connected to" another element or when an element or circuit is referred to as being "connected between" two nodes, it may be directly coupled or connected to another element or there may be intermediate elements, and the connection between the elements may be physical, logical, or a combination thereof. In contrast, when an element is referred to as being "directly coupled to" or "directly connected to" another element, it means that there are no intermediate elements between the two.

[0039] Meanwhile, in this patent specification and claims, certain terms are used to refer to specific components. Those of ordinary skill in the art should understand that hardware manufacturers may use different terms to refer to the same component. This patent specification and claims do not use the difference in names as a way to distinguish components, but use the difference in functions of components as the criterion for distinction.

[0040] In addition, it should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising one..." does not exclude the presence of additional identical elements in the process, method, article or device comprising the said element.

[0041] FIG. 1 is a schematic structural diagram of a driving circuit driving a display panel provided by an embodiment of the present invention.

[0042] As shown in FIG. 1, the driving circuit 20 is used to perform display driving on the display panel 10. The driving circuit 20 may include: a display driving circuit 201 corresponding to driving the display panel 10, and a power management circuit 202. The power management circuit 202 is connected to the display driving circuit 201 and provides a supply voltage AVDD to the display driving circuit 201.

[0043] In an embodiment of the present invention, the display driving circuit 201 is used to perform display parameter statistics on the display panel 10 it drives, obtain dynamic setting of gamma voltage under different display parameters to drive the display panel, and obtain the setting of control pulses according to the dynamic setting of the gamma voltage. The above gamma voltage is obtained from the supply voltage AVDD through, for example, an LDO (low dropout regulator) circuit, which has a high power supply rejection ratio and the output voltage is not affected by power supply noise. Specifically, the LDO circuit adjusts the load current to ensure that the output voltage is a stable value and is only related to the resistor and the reference voltage, and has nothing to do with the supply voltage AVDD.

[0044] The display driving circuit 201 is also used to perform feedback calculation on the determined gamma voltage value to obtain the target value of the supply voltage AVDD for feedback regulation.

[0045] Among them, the display driving circuit 201 and the power management circuit 202 are connected through a Signal Wire (SWIRE) interface. SWIRE is an interface protocol that controls the output supply voltage value AVDD by the number of pulses emitted. The output (AVDD) of the power management circuit 202 supplies the display driving circuit 201. In this way, it can be realized to feedback and regulate the supply voltage AVDD through the dynamic gamma voltage.

[0046] Figure 2 is a schematic diagram of the internal structure of the display driving circuit provided by an embodiment of the present invention.

[0047] As shown in Figure 2, the display driving circuit 201 specifically includes a display parameter statistics module 2011, a gamma voltage determination module 2012, and a supply voltage determination module 2013.

[0048] Among them, the display parameter statistics module 2011 is used to statistically analyze the display parameters of the display panel 10 and provide the display parameters to the gamma voltage determination module 2012. In one embodiment, the display parameters are, for example, the display brightness or display frequency of the display panel.

[0049] The gamma voltage determination module 2012 stores gamma voltage data, and the gamma voltage data includes dynamic gamma voltages corresponding to the display parameters of the display panel respectively. The gamma voltage determination module 2012 determines the corresponding gamma voltage in the gamma voltage data according to the display parameters. Among them, taking the refresh rate as an example, the gamma voltage corresponding to the first refresh rate includes: the sub-gamma voltage a0 corresponding to gray scale 0, the sub-gamma voltage a1 corresponding to gray scale 1, …, the sub-gamma voltage a255 corresponding to gray scale 255. The gamma voltage corresponding to the second refresh rate includes: the sub-gamma voltage b0 corresponding to gray scale 0, the sub-gamma voltage b1 corresponding to gray scale 1, …, the sub-gamma voltage b255 corresponding to gray scale 255, and so on. The dynamic gamma voltages under other refresh rates or display brightnesses can be obtained.

[0050] The supply voltage determination module 2013 realizes the feedback regulation of the supply voltage AVDD according to the dynamic setting of the gamma voltage by obtaining the setting of the control pulse. Specifically, the feedback regulation is, for example, directly setting the dynamic supply voltage AVDD through the dynamic gamma voltage, or setting the difference between the dynamic supply voltage AVDD and the dynamic gamma voltage, and then obtaining the value of the supply voltage AVDD to be regulated.

[0051] Figure 3 is a flowchart of a method for regulating the supply voltage provided by an embodiment of the present invention;

[0052] As shown in FIG. 3, a power supply voltage regulation method provided by an embodiment of the present invention is implemented by, for example, the above-mentioned display driving circuit, and specifically includes the following steps:

[0053] S01: Obtain the dynamic setting of the gamma voltage under different display parameters.

[0054] In step S01, gamma voltage data is pre-stored in the gamma voltage determination module. The gamma voltage data includes dynamic gamma voltages respectively corresponding to the display parameters of the display panel. The gamma voltage determination module 2012 determines the corresponding gamma voltage in the gamma voltage data according to the display parameters. Among them, taking the refresh rate as an example, the gamma voltages corresponding to the first refresh rate include: the sub-gamma voltage a0 corresponding to gray level 0, the sub-gamma voltage a1 corresponding to gray level 1, …, the sub-gamma voltage a255 corresponding to gray level 255. The gamma voltages corresponding to the second refresh rate include: the sub-gamma voltage b0 corresponding to gray level 0, the sub-gamma voltage b1 corresponding to gray level 1, …, the sub-gamma voltage b255 corresponding to gray level 255. By analogy, the dynamic gamma voltages of other refresh rates can be obtained. In terms of display brightness, similarly, the minimum display brightness of different display modes is 0, and the maximum display brightness of different display modes can vary from several nits to several hundred nits. Exemplary maximum display brightnesses can include 2 nits, 5 nits, 10 nits, 30 nits, 100 nits, 300 nits, 500 nits or 600 nits, etc. Each display brightness range can be divided into 2n gray levels, for example, can be divided into 0-255 gray levels, corresponding to different sub-gamma voltages.

[0055] S02: Obtain the setting of the control pulse according to the dynamic setting of the gamma voltage.

[0056] In step S02, there are various methods to obtain the setting of the control pulse according to the dynamic setting of the gamma voltage.

[0057] FIG. 4 is a flowchart of specific steps in the power supply voltage regulation method provided by an embodiment of the present invention;

[0058] As shown in FIG. 4, step S02 in FIG. 4 can specifically include the following steps:

[0059] S11: Preset the control pulses of the power supply voltage under different display parameters.

[0060] In step S11, the setting of the control pulse under different display parameters is added inside the display driving circuit 201, where the control pulse is used to control the output power supply voltage value AVDD.

[0061] S12: Based on the dynamic setting of the gamma voltage, inversely deduce the setting of the control pulse.

[0062] In step S12, according to the dynamic setting of the gamma voltage under different display parameters, when the display parameter of the display panel is a certain value, the corresponding gamma voltage is obtained, and then the setting of the control pulse is obtained according to the display parameter characterized by the gamma voltage.

[0063] In this flowchart, the control pulses of the power supply voltage under different display parameters are preset, and the setting of the control pulse is inversely deduced according to the display parameter characterized by the gamma voltage.

[0064] Figure 5 is a flowchart of the specific steps in the power supply voltage adjustment method provided by another embodiment of the present invention;

[0065] As shown in Figure 5, step S02 in Figure 3 can specifically include the following steps:

[0066] S21: Determine the difference between the gamma voltage and the power supply voltage.

[0067] S22: Through the difference between the gamma voltage and the power supply voltage, inversely deduce the dynamic setting of the power supply voltage, and then obtain the control pulse of the power supply voltage.

[0068] In step S22, according to the corresponding relationship between the difference between the power supply voltage AVDD and the gamma voltage, that is, according to the display parameter, the dynamic setting of the gamma voltage is obtained, and several power supply voltage AVDD data under the above different display parameters are respectively corresponding. When the display parameter of the display panel is a certain value, the corresponding gamma voltage is obtained, and then the power supply voltage AVDD is inversely deduced according to the corresponding relationship between the gamma voltage and the power supply voltage AVDD, and then the control pulse corresponding to the power supply voltage is obtained.

[0069] In this flowchart, since the gamma voltage is obtained from the power supply voltage AVDD through an LDO (low dropout regulator) circuit, the low dropout regulator LDO receives the power supply voltage AVDD and outputs the gamma input voltage, and the difference between the two is fixed. That is, by determining the difference between the gamma voltage and the power supply voltage, after obtaining the dynamic gamma voltage setting, the dynamic setting of the corresponding power supply voltage AVDD can be obtained.

[0070] S03: Control the power management circuit to generate the corresponding power supply voltage through the control pulse.

[0071] In step S03, the obtained control pulse is provided to the power management circuit 202 through the SWIRE interface to generate a corresponding power supply voltage AVDD, and the power supply voltage is the lowest voltage required by the display module under the display parameters.

[0072] The above power supply voltage adjustment method provides a dynamic switching method for the power supply voltage. Through the dynamic AVDD voltage setting, the power supply voltage AVDD can be the lowest voltage required by the display module under different display modes and different display brightnesses, thereby reducing power consumption.

[0073] It should be additionally noted that the above power supply voltage adjustment method is not only applicable to OLED light-emitting elements. In an embodiment of the present application, a display device is further provided, including the above driving circuit and a display panel, and the display panel is one of a liquid crystal display panel, a micro light-emitting diode display panel, a mini light-emitting diode display panel, a quantum dot light-emitting diode display panel, and an organic light-emitting diode display panel.

[0074] It should be noted that those of ordinary skill in the art can understand that the words "during", "when", and "when...", which are related to circuit operation used herein, are not strict terms indicating actions that occur immediately when the starting action begins, but there may be some small but reasonable one or more delays between them and the reaction actions initiated by the starting action, such as various transmission delays, etc. The words "about" or "substantially" used herein mean that the element value has a parameter that is expected to be close to the stated value or position. However, as is well known in the art, there are always small deviations that make it difficult for the value or position to be exactly the stated value. It has been appropriately determined in the art that a deviation of at least ten percent (10%) (for semiconductor doping concentration, at least twenty percent (20%)) is a reasonable deviation from the described exact ideal target. When used in combination with the signal state, the actual voltage value or logical state of the signal (such as "1" or "0") depends on whether positive logic or negative logic is used.

[0075] According to the embodiments of the present invention as above, these embodiments do not elaborate on all details, nor do they limit the invention to only the specific embodiments. Obviously, according to the above description, many modifications and variations can be made. These embodiments are selected and specifically described in this specification to better explain the principles and practical applications of the present invention, so that those skilled in the art can make good use of the present invention and its modifications based on the present invention. The protection scope of the present invention should be defined by the scope defined by the claims of the present invention and their equivalents.

Claims

1. A power supply voltage regulation method, comprising: Obtaining the dynamic setting of the gamma voltage under different display parameters; Obtaining the setting of the control pulse according to the dynamic setting of the gamma voltage; Controlling a power management circuit through the control pulse to generate a corresponding power supply voltage, wherein, the obtaining the setting of the control pulse according to the dynamic setting of the gamma voltage includes: Presetting the control pulses of the power supply voltage under different display parameters; Back-calculating the setting of the control pulse according to the dynamic setting of the gamma voltage, the back-calculating the setting of the control pulse according to the dynamic setting of the gamma voltage includes: Obtaining the corresponding gamma voltage according to the dynamic setting of the gamma voltage under different display parameters; Obtaining the setting of the control pulse according to the display parameters represented by the gamma voltage.

2. The power supply voltage regulation method according to claim 1, wherein, The display parameters include display brightness and display frequency.

3. The power supply voltage regulation method according to claim 1, wherein, The power supply voltage is the lowest voltage required by the display module under the display parameters.

4. A power supply voltage regulation method, comprising: Obtaining the dynamic setting of the gamma voltage under different display parameters; Obtaining the setting of the control pulse according to the dynamic setting of the gamma voltage; Controlling a power management circuit through the control pulse to generate a corresponding power supply voltage, wherein, the obtaining the setting of the control pulse according to the dynamic setting of the gamma voltage includes: Determining the difference between the gamma voltage and the power supply voltage; Back-calculating the dynamic setting of the power supply voltage through the difference between the gamma voltage and the power supply voltage, and further obtaining the control pulse of the power supply voltage.

5. The power supply voltage regulation method according to claim 4, wherein, The display parameters include display brightness and display frequency.

6. The power supply voltage regulation method according to claim 4, wherein, The power supply voltage is the lowest voltage required by the display module under the display parameters.

7. A driving circuit for performing the power supply voltage regulation method according to any one of claims 1-6, the driving circuit comprising: A display driving circuit for performing display parameter statistics on a display panel driven thereby, obtaining the dynamic setting of the gamma voltage under different display parameters to drive the display panel, and obtaining the setting of the control pulse according to the dynamic setting of the gamma voltage; A power management circuit connected to the display driving circuit, receiving the control pulse and generating a corresponding power supply voltage.

8. The drive circuit according to claim 7, wherein, The display driving circuit includes: A display parameter statistics module for performing display parameter statistics on the display panel and providing the display parameters to a gamma voltage determination module; A gamma voltage determination module storing gamma voltage data for determining a corresponding gamma voltage in the gamma voltage data according to the display parameters; A power supply voltage determination module for obtaining the setting of the control pulse according to the dynamic setting of the gamma voltage.

9. The drive circuit according to claim 8, wherein, The gamma voltage data includes dynamic gamma voltages respectively corresponding to the display parameters.

10. A display device, comprising: A display panel, and the driving circuit according to any one of claims 7-9, wherein the display panel is one of a liquid crystal display panel, a micro light-emitting diode display panel, a mini light-emitting diode display panel, a quantum dot light-emitting diode display panel, and an organic light-emitting diode display panel.

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