CN116844476A

CN116844476A - Display device, display module, display driving device and display driving method

Info

Publication number: CN116844476A
Application number: CN202310934840.4A
Authority: CN
Inventors: 屈雪; 鲍文超; 李慧慧; 刘苗
Original assignee: BOE Technology Group Co Ltd; Hefei BOE Zhuoyin Technology Co Ltd
Current assignee: BOE Technology Group Co Ltd; Hefei BOE Zhuoyin Technology Co Ltd
Priority date: 2023-07-26
Filing date: 2023-07-26
Publication date: 2023-10-03

Abstract

The display driving device comprises a time sequence control circuit, a power management integrated circuit and a gamma circuit, wherein the input end of the gamma circuit is connected with the power management integrated circuit, and the output end of the gamma circuit is connected with a source electrode driving integrated circuit of a display panel; the timing control circuit is coupled to the power management integrated circuit and the gamma circuit and configured to: in each frame display period, obtaining the maximum value of the required brightness of a target object in a display panel in a current frame; determining a gamma voltage maximum value according to the required brightness maximum value; determining a target AVDD voltage according to the gamma voltage maximum value, and controlling a power management integrated circuit to output the target AVDD voltage to the gamma circuit; the target AVDD voltage is not lower than the gamma voltage maximum. The display driving device can reduce logic power consumption of the display panel.

Description

Display device, display module, display driving device and display driving method

Technical Field

The present application relates to the field of display technologies, and in particular, to a display device, a display module, a display driving apparatus, and a display driving method.

Background

Organic Light-Emitting Diode (OLED) display products are increasingly used. Taking an Active-matrix organic light emitting diode (AMOLED) display panel as an example, the AMOLED display panel has advantages of self-luminescence, fast response, high contrast, etc., and is increasingly applied to display devices. The OLED is a current-type device that controls the light emitting luminance of a light emitting device or pixel by controlling a current signal flowing through a driving transistor DTFT through a data voltage signal Vdata during driving. The larger the brightness is, the larger the current is, the larger the logic power consumption generated by the OLED panel is, the more the afterimage problem is easy to occur, and the display quality is influenced. In addition to OLEDs, display panels that suffer from the above-described logic power consumption problems include, but are not limited to: quantum dot light emitting diodes (Quantum Dot Light Emitting Diodes, QLED for short), micro light emitting diodes (Micro Light Emitting Diodes, micro LED for short), and the like.

Disclosure of Invention

In view of the above, the present disclosure provides a display device, a display module, a display driving apparatus, and a display driving method, capable of reducing logic power consumption of a display panel.

In a first aspect, the present disclosure provides, by way of an embodiment, the following technical solutions:

the display driving device comprises a time sequence control circuit, a power management integrated circuit and a gamma circuit, wherein the input end of the gamma circuit is connected with the power management integrated circuit, and the output end of the gamma circuit is connected with a source electrode driving integrated circuit of a display panel; the timing control circuit is coupled to the power management integrated circuit and the gamma circuit and configured to:

in each frame display period, obtaining the maximum value of the required brightness of a target object in a display panel in a current frame; determining a gamma voltage maximum value according to the required brightness maximum value; determining a target AVDD voltage according to the gamma voltage maximum value, and controlling a power management integrated circuit to output the target AVDD voltage to the gamma circuit; the target AVDD voltage is not lower than the gamma voltage maximum.

In some embodiments, the target object is N sub-display areas in the display panel, N >1 and is an integer;

the timing control circuit is configured to:

acquiring the required brightness of all the sub-pixels in all the sub-display areas in the current frame, and determining the maximum value of the required brightness and a target sub-display area corresponding to the maximum value of the required brightness; determining a gamma voltage maximum value according to the required brightness maximum value; and controlling the power management integrated circuit to output the target AVDD voltage to a gamma circuit corresponding to the target sub-display area.

In some embodiments, the target object is M types of sub-pixels in the display panel, the display driving device includes M groups of gamma circuits, one type of sub-pixel corresponds to one group of gamma circuits, and M is greater than or equal to 3 and is an integer;

the timing control circuit is configured to:

for each type of sub-pixel, obtaining the required brightness of all the same type of sub-pixels and determining the maximum value of the required brightness; determining a corresponding gamma voltage maximum value according to the required brightness maximum value of each type of sub-pixel; for each type of sub-pixel, the power management integrated circuit is controlled to output the target AVDD voltage to a corresponding gamma circuit.

In some embodiments, the target object is P sub-pixel groups in the display panel, each sub-pixel group includes at least one type of sub-pixel, the display driving device includes P groups of gamma circuits, one sub-pixel group corresponds to one group of gamma circuits, and P is greater than or equal to 2 and is an integer;

the timing control circuit is configured to:

for each sub-pixel group, obtaining the required brightness of all similar sub-pixels in the sub-pixel group in the current frame and determining the maximum value of the required brightness; determining a corresponding gamma voltage maximum for a required brightness maximum of each sub-pixel group; for each sub-pixel group, controlling a power management integrated circuit to output the target AVDD voltage to the corresponding gamma circuit.

In some embodiments, the timing control circuit is configured to:

if the gamma voltage maximum value is smaller than or equal to a first set value, determining the target AVDD voltage as the first set value;

if the gamma voltage maximum value is greater than the first set value and less than a second set value, determining the target AVDD voltage to be not lower than the gamma voltage maximum value;

and if the gamma voltage maximum value is greater than or equal to the second set value, determining the target AVDD voltage as the gamma voltage maximum value.

In some embodiments, the first set value ranges from 6V to 12V, and the second set value ranges from 16V to 17V.

In some embodiments, the timing control circuit is configured to:

determining the data voltage output by the source drive integrated circuit according to the maximum value of the required brightness;

and determining the maximum value of the gamma voltage according to the data voltage.

In a second aspect, based on the same inventive concept, the present disclosure provides, through an embodiment, the following technical solutions:

a display driving method applied to a display driving module provided in an embodiment of a first aspect, the method includes:

in each frame display period, obtaining the maximum value of the required brightness of a target object in a display panel in a current frame;

determining a gamma voltage maximum value according to the required brightness maximum value;

determining a target AVDD voltage according to the gamma voltage maximum value, and controlling a power management integrated circuit to output the target AVDD voltage to a gamma circuit corresponding to the target object; the target AVDD voltage is not lower than the gamma voltage maximum.

In a third aspect, based on the same inventive concept, the present disclosure provides, by an embodiment, the following technical solutions:

a display module comprises a display panel and a display driving device provided by an embodiment of a first aspect.

According to a fourth aspect, based on the same inventive concept, the present disclosure provides, through an embodiment, the following technical solutions:

a display device includes a display module provided in an embodiment of the third aspect.

Through one or more technical schemes of the present disclosure, the present disclosure has the following beneficial effects or advantages:

the present disclosure provides a display driving apparatus, which configures a timing control circuit to: in the display period of each frame, determining a corresponding gamma voltage maximum value according to the maximum value of the required brightness of a target object in the display panel in the current frame, further determining a corresponding target AVDD voltage, and controlling the power management integrated circuit to output the target AVDD voltage to a gamma circuit corresponding to the target object. According to the display driving device, the corresponding AVDD voltage is adjusted according to the maximum value of the required brightness of the target object in each display frame, and compared with the scheme that the AVDD voltage is set to be the fixed maximum value at present, the display driving device can effectively reduce the AVDD voltage in a display period with lower required brightness, and realize self-adaptive adjustment of the AVDD voltage according to the actual picture brightness, so that the logic power consumption of a display panel is reduced.

The foregoing description is merely an overview of the technical solutions of the present disclosure, and may be implemented according to the content of the specification in order to make the technical means of the present disclosure more clearly understood, and in order to make the above and other objects, features and advantages of the present disclosure more clearly understood, the following specific embodiments of the present disclosure are specifically described.

Drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the disclosure. Also, like reference numerals are used to designate like parts throughout the figures.

In the drawings:

FIG. 1 shows a schematic diagram of a 3T1C pixel driving circuit;

FIG. 2 shows a schematic diagram of a display driving apparatus of an embodiment of the present disclosure;

fig. 3 is a schematic diagram of a system architecture of a display module driving circuit according to an embodiment of the disclosure;

fig. 4A shows a schematic diagram of a display module of scheme 1 in an embodiment of the disclosure;

FIG. 4B shows a logic control flow diagram of a scheme 1 timing control circuit of an embodiment of the present disclosure;

FIG. 5 shows a logic control flow diagram of a scheme 2 timing control circuit of an embodiment of the present disclosure;

FIG. 6 shows a logic control flow diagram of a scheme 3 timing control circuit of an embodiment of the present disclosure;

FIG. 7 shows a flow diagram of a display driving method of an embodiment of the present disclosure;

FIG. 8 is a schematic diagram of a display module according to an embodiment of the disclosure;

fig. 9 shows a schematic diagram of a display device of an embodiment of the present disclosure.

Detailed Description

Hereinafter, embodiments of the present disclosure will be described with reference to the accompanying drawings. It should be understood that the description is only exemplary and is not intended to limit the scope of the present disclosure. In addition, in the following description, descriptions of well-known structures and techniques are omitted so as not to unnecessarily obscure the concepts of the present disclosure.

Various structural schematic diagrams according to embodiments of the present disclosure are shown in the drawings. The figures are not drawn to scale, wherein certain details are exaggerated for clarity of presentation and may have been omitted. The shapes of the various regions, layers and relative sizes, positional relationships between them shown in the drawings are merely exemplary, may in practice deviate due to manufacturing tolerances or technical limitations, and one skilled in the art may additionally design regions/layers having different shapes, sizes, relative positions as actually required.

Unless defined otherwise, technical or scientific terms used in this disclosure should be given the ordinary meaning as understood by one of ordinary skill in the art to which this disclosure belongs. The terms "first," "second," and the like, as used in this disclosure, do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. Likewise, the terms "a," "an," or "the" and similar terms do not denote a limitation of quantity, but rather denote the presence of at least one. The word "comprising" or "comprises", and the like, means that elements or items preceding the word are included in the element or item listed after the word and equivalents thereof, but does not exclude other elements or items. The terms "connected" or "connected," and the like, are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", etc. are used merely to indicate relative positional relationships, which may also be changed when the absolute position of the object to be described is changed.

Studies have shown that one of the methods of reducing the logic power consumption of display panels is to reduce the AVDD (Analog VDD) voltage output by the power management integrated circuit (Power Management Integrated Circuit, PMIC for short). This is because the current level in the light emitting device OLED is mainly determined by the data voltage Vdata in the light emitting period. For example, for the pixel driving circuit of 3T1C shown in fig. 1, the driving transistor DT thereof is connected to the power signal terminal ELVDD, the second electrode of the first transistor T1, and the anode of the light emitting device D1, respectively; the cathode of the light-emitting device D1 is grounded; the control electrode of the first transistor T1 is connected with the first scanning signal end G1, and the first electrode is connected with the Data signal end Data; the control electrode of the second transistor T2 is connected with the first scanning signal end G2, the first end of the first capacitor C1 is connected with the second electrode of the second transistor T2, and the second end is grounded; one end of the second capacitor C2 is connected between the first transistor T1 and the control electrode of the driving transistor DT, and the other end is connected to the first electrode of the second transistor T2.

According to the saturation current formula, the current in the light emitting device OLED during the light emitting phase is:

I＝K×(V _GS -V _th ) ² (1)

k in the above formula is a constant value, V, related to the driving transistor DT itself _th To drive the threshold voltage of the transistor DT, V _GS Representing the voltage between the gate and source of the drive transistor DT, wherein the voltage at the gate node is charged to the data voltage V during the data writing phase _data Thus V _GS And data voltage V _data Directly related.

As can be seen from the formula (1), the OLED current of the light-emitting device is mainly determined by V _data Voltage determination, the greater the brightness of the panel display, the greater the current required, V _data The larger the voltage that needs to be supplied, the larger the AVDD output by the PMIC increases, resulting in an increase in logic power consumption. In the current display method or driving method, the AVDD voltage outputted from the PMIC is set to a fixed value, and the fixed value is usually the maximum value within the selectable range of AVDD in order to ensure normal display at the maximum brightness. In practice, the actual display images of the display panels at different times are different, and the maximum display voltages actually required are different, so that the required AVDD voltages are different. In some time periods with lower brightness requirements, if the AVDD voltage still takes a fixed maximum value, the phenomenon of AVDD voltage redundancy exists, so that the panel logic power consumption part is wasted. Therefore, in order to reduce logic power consumption, particularly for oversized display panels, it is necessary to reduce AVDD voltage without affecting the normal display of the display panel.

Based on the above problem analysis, in an alternative embodiment, referring to fig. 2, a display driving apparatus is provided, which includes a timing control circuit TCON IC, a power management integrated circuit PMIC, and a Gamma circuit Gamma, wherein an input end of the Gamma circuit Gamma is connected to the power management integrated circuit PMIC, and an output end of the Gamma circuit Gamma is connected to a source driving integrated circuit of a display panel; the timing control circuit TCON IC is connected to the power management integrated circuit PMIC and the Gamma circuit Gamma, and is configured to: in each frame display period, obtaining the maximum value of the required brightness of a target object in a display panel in a current frame; determining the maximum value of gamma voltage according to the maximum value of the required brightness; determining a target AVDD voltage according to the maximum value of the Gamma voltage, and controlling the power management integrated circuit PMIC to output the target AVDD voltage to the Gamma circuit Gamma; the target AVDD voltage is not lower than the gamma voltage maximum value.

Referring to fig. 3, the system architecture of the driving circuit of the display panel may be a timing controller circuit board (Timing Controller, TCON circuit board), on which the timing control circuit TCON IC, the power management integrated circuit PMIC, and the Gamma circuit Gamma are integrated. In addition, the common electrode voltage circuit Vcom may also be integrated on the TCON circuit board. The TCON circuit board is used as a core circuit for controlling the Panel time sequence action of the display Panel, converts video signals obtained from the device main board into data signal formats required by a Source drive integrated circuit Source-IC on the display Panel through the interface connector, and simultaneously transmits the data signals to the Source drive integrated circuit Source-IC. The output voltage of the PMIC comprises a digital working voltage DVDD supplied to each IC, an analog voltage AVDD supplied to the Gamma and Vcom circuits, and the control signals of the outputs on the TCON circuit board comprise control signals of the Source-IC and the shift register Gate-IC.

The basic flow of pixel brightness control is as follows: after the power management integrated circuit PMIC outputs the AVDD voltage to the gamma circuit, the gamma circuit outputs the gamma voltages VG1 to VG9 to the Source driver integrated circuit Source IC, and the Source driver integrated circuit outputs the data voltage V _data So as to control the current of the light-emitting device OLED in the light-emitting stage and achieve the required brightness. The maximum gamma voltage is typically VG1. In some embodiments, the Gamma circuit may include two parts, the first part is on the TCON circuit board with AVDD voltage as a reference voltage, generating new reference voltages VG1-VG9 in the Gamma resistor network string; the second part is to input multiple reference voltages to Source driver IC, and then combine with Gamma resistor network string inside Source IC to generate all gray scale voltages.

The target object in embodiments of the present disclosure may be a partition or a subpixel in a display area of a display panel. Taking partition as an example, N equally dividing the display area into target objects; for a sub-pixel, a class of sub-pixels may be taken as one target object. In either case, the required luminance of the plurality of sub-pixels in the current frame needs to be obtained, and then the maximum value of the required luminance is determined from the obtained required luminance. The required brightness refers to the brightness that the sub-pixel needs to generate for normal display in the current frame period.

The brightness value of the display panel can be measured by gray scale values, the gray scale value ranges from 0 to 255, the larger the gray scale value is, the higher the brightness of the pixel is, the smaller the gray scale value is, the lower the brightness of the pixel is, wherein the gray scale value of white is 255, and the gray scale value of black is 0. The determination of the required luminance maximum may thus be a determination of a gray-scale maximum from the required gray-scale values of the respective pixels in the current frame.

The corresponding gamma voltage maximum value can be determined according to the required brightness by adopting a reverse deduction mode. One proposal is to make the brightness maximum L according to the requirement _max Determining the data voltage V output by the source driver integrated circuit _data Then according to the data voltage V _data The mapping relation with the gamma voltage determines the gamma voltage maximum VG1. Wherein according to the required brightness L _max Determining data voltage V _data The current I can be obtained according to the following formula (2), and then the data voltage can be reversely deduced by combining the formula (1).

I＝a×L (2)

I in formula (2) is a current in the light emitting device OLED, a is a coefficient term, and L is luminance.

Another solution is to combine Gamma curves to determine the Gamma voltage directly from the required brightness. In order to realize that the change relation between the digitized gray scale value and the human eye perceived brightness is a linear relation, a gray scale-transmittance curve is fitted according to a voltage-transmittance relation (V-T) curve of the display panel, and the index of the fitted curve is Gamma (Gamma). When the value of Gamma (Gamma) is 2.0-2.4, the linear requirement of human eyes on brightness change and gray level change is met, and the Gamma (Gamma) is usually taken as a central value of 2.2, so that the corresponding Gamma voltage can be determined through the gray level value of brightness by means of a Gamma2.2 curve, specifically, the corresponding transmittance T is obtained according to the known gray level value, then the V-T curve of the driving voltage and the transmittance is queried, and the corresponding Gamma voltage VG1 can be obtained.

When the target AVDD voltage is determined according to the maximum value of the gamma voltage, the target AVDD voltage is not lower than the maximum value of the gamma voltage, namely AVDD is not less than VG1, so that the logic power consumption is reduced while the brightness requirement of the display panel is met. Optionally, in order to ensure display quality, the target AVDD voltage may be correspondingly provided with an upper limit value and a lower limit value, and a configuration scheme of a corresponding timing control circuit TCON IC is specifically as follows:

if the maximum value of the gamma voltage is smaller than or equal to the first set value, determining the target AVDD voltage as the first set value; if the gamma voltage maximum value is larger than the first set value and smaller than the second set value, determining the target AVDD voltage to be not lower than the gamma voltage maximum value; and if the gamma voltage maximum value is greater than or equal to the second set value, determining the target AVDD voltage as the gamma voltage maximum value.

The first set value is a set lower limit value of the target AVDD voltage, and the second set value is a set upper limit value of the target AVDD voltage. The first set value and the second set value are specifically determined according to the design requirement of the display panel. For example, for AMOLED, the first set value may be 6V to 12V, preferably 12V, and the second set value may be 16V to 17V, preferably 16.5V. At the maximum value VG1 of the gamma voltage greater than the first set value V _min And is smaller than the second set value V _max In this case, the target AVDD voltage can be set to have a value range of [ VG1, vmax]. In some embodiments avdd=vg1 may be made to minimize logic power consumption.

After determining the target AVDD voltage, the power management integrated circuit PMIC can output the target AVDD voltage to a Gamma circuit Gamma corresponding to the target object, the Gamma circuit Gamma generates a corresponding Gamma voltage VG1 to a Source drive integrated circuit Source-IC according to the target AVDD voltage, and the Source drive integrated circuit Source-IC generates a corresponding number according to the Gamma voltage VG1According to voltage V _data V is set in the data writing stage of pixel driving _data And loading the signal to a gate node of the driving transistor corresponding to the target object.

Thus, the display driving apparatus provided by the embodiments of the present disclosure is configured by configuring the timing control circuit TCON IC to: in the display period of each frame, determining a corresponding gamma voltage maximum value according to the maximum value of the required brightness of a target object in the display panel in the current frame, further determining a corresponding target AVDD voltage, and controlling the power management integrated circuit to output the target AVDD voltage to a gamma circuit corresponding to the target object. According to the display driving device, the corresponding AVDD voltage is adjusted according to the maximum value of the required brightness of the target object in each display frame, and compared with the scheme that the AVDD voltage is set to be the fixed maximum value at present, the display driving device can effectively reduce the AVDD voltage in a display period with lower required brightness, and realize self-adaptive adjustment of the AVDD voltage according to the actual picture brightness, so that the logic power consumption of a display panel is reduced.

In order to more intuitively illustrate the driving method provided by the embodiment of the present disclosure, in the following, an AMOLED display panel is taken as an example, and the driving method provided by the embodiment of the present disclosure is further described with reference to a specific embodiment.

Scheme 1: the target object is N sub-display areas in the display panel, N >1 and is an integer.

Accordingly, the timing control circuit is configured to:

acquiring the required brightness of all the sub-pixels in all the sub-display areas in the current frame, and determining the maximum value of the required brightness and a target sub-display area corresponding to the maximum value of the required brightness; determining the maximum value of gamma voltage according to the maximum value of the required brightness; and controlling the power management integrated circuit PMIC to output the target AVDD voltage to the Gamma circuit Gamma corresponding to the target sub-display area.

Specifically, in the scheme 1, a display area of the display panel is divided into a plurality of sub-display areas, wherein the sub-display areas are only divided into different areas, and no structure exists between any two sub-display areas to perform physical separation. The number of the sub-display areas can be set according to the requirement, for example, the number of the sub-display areas is 2-10, and the N sub-display areas can be divided into N equal areas or have different areas.

In the scheme 1, the required brightness of all the sub-pixels in the current frame is obtained, a sub-display area with the largest required brightness is found out and used as a target sub-display area, and then the corresponding gamma voltage maximum value and the target AVDD voltage are determined according to the required brightness maximum value. The target AVDD voltage is then applied to the target sub-display area. The remaining sub-display areas may determine the corresponding AVDD voltage according to the actual brightness.

As an example, fig. 4A provides an AMOLED display module, where the display panel includes a display area and a routing area, the routing area includes a Chip On Film (COF) and a Source driver integrated circuit Source IC disposed On the COF, the Chip On Film COF is connected to a circuit board XPCB, the XPCB is further connected to a TCON circuit board through a flexible circuit board FPC, and a power management integrated circuit PMIC, a Gamma circuit Gamma and a TCON IC are integrated On the TCON circuit board, where the TCON IC may be a field programmable gate array (Field Programmable Gate Array, FPGA) or an application specific integrated circuit Chip (Application Specific Integrated Circuit, ASIC).

In FIG. 4A, the display area is divided into 4 sub-display areas, and the brightness of each sub-display area is different, so that the OLED current required by each sub-display area is different, and the data voltage V required by each sub-display area is different _data Different gamma voltage maxima VG1, which in turn result in different requirements, correspond to different AVDD voltages. By comparing the brightness of the 4 sub-display areas, if the brightness difference of the display screen is large, for example, the brightness of the sub-display area 1 is high, corresponding V _data The VG1 voltage required to be outputted by the gamma circuit is large as 16V, and there are regions of low brightness in the sub-display area 2, the sub-display area 3 and the sub-display area 4, and V required for the regions of low brightness _data The VG1 voltage required to be output by the gamma circuit is very small, e.g., 5V.

In order to ensure the normal display of the AMOLED, a first set value V can be set _min =12v, second set point V _max At time=16.5v, the detailed logic control diagram of the timing control circuit TCON IC can be seen in fig. 4B, including the followingThe steps are as follows:

s41: comparing the required brightness of the 4 sub-display areas, and determining the maximum value of the required brightness;

s42: determining a corresponding target sub-display area and a data voltage V according to the required brightness maximum value _data ；

S43: according to the data voltage V _data Determining gamma voltages VG1-VG 9;

s44: judging whether VG1 is larger than 12V;

S45A: if yes, setting AVDD to be more than or equal to VG1;

S45B: if not, avdd=12v is set; this is due to the minimum input voltage V accepted by the Source IC of the Source drive integrated circuit _min ＝12V；

S46: judging whether AVDD is smaller than 16.5V;

S47A: if yes, setting AVDD=VG1, and meeting the requirement of not less than 12V;

S47B: if not, avdd=16.5v is set.

By detecting the brightness of the screen in the four partitions, the data voltage V is reversely deduced according to the brightness _data The gamma voltage maximum VG1 can thus be determined, resulting in the desired corresponding AVDD voltage value. AVDD in each partition is larger than or equal to VG1, and logic power consumption is reduced while the brightness requirement of a display screen is met.

The specific flow of AVDD voltage control is as follows: the 220V power supply is converted into 12V through a power supply adapter plate to supply power to a time sequence controller or a time sequence control integrated circuit TCON, a power management integrated circuit PMIC on the TCON outputs AVDD voltage to a Gamma circuit Gamma, the Gamma circuit Gamma outputs VG1-VG9, the maximum Gamma voltage VG1 and a clock embedded differential CEDS signal are input to a Source drive integrated circuit Source IC together, and a Source IC end outputs data voltage V _data The magnitude of the current in the light emitting device OLED is controlled so that the display region exhibits a desired brightness. Wherein, scheme 1 may only set up a group of gamma circuits.

Scheme 2: the target object is M types of sub-pixels in the display panel, the display driving device comprises M groups of gamma circuits, one type of sub-pixel corresponds to one group of gamma circuits, and M is more than or equal to 3 and is an integer.

The "class of sub-pixels" refers to the emission type of the sub-pixels, for example, if the RGB sub-pixels form a pixel unit, three sub-pixels, respectively, are R pixel (red), G pixel (green) and B pixel (blue); if the RGBW subpixel forms a pixel unit, four types of subpixels, respectively, an R pixel (red), a G pixel (green), a B pixel (blue), and a W pixel (white), are included.

Corresponding to scheme 2, the timing control circuit TCON IC is configured to:

for each type of sub-pixel, obtaining the required brightness of all the same type of sub-pixels and determining the maximum value of the required brightness; determining a corresponding gamma voltage maximum value according to the required brightness maximum value of each type of sub-pixel; for each type of sub-pixel, the control power management integrated circuit outputs a target AVDD voltage to the corresponding gamma circuit.

Specifically, the required brightness of all the sub-pixels of the same type is obtained, for example, RGBW is taken as an example, that is, the required brightness of all the R pixels, the required brightness of all the G pixels, the required brightness of all the B pixels, and the required brightness of all the W pixels are respectively obtained, and then in each frame picture, the maximum brightness L of the R pixels in the current frame picture is determined according to the brightness of each sub-pixel R, G, B, W _RMAX Maximum brightness L of G pixel _GMAX Maximum brightness L of B pixel _BMAX Maximum brightness L of W pixel _WMAX . Thus, the data voltages Vdata corresponding to the four types of sub-pixels can be obtained respectively, and 4 sets of matched Gamma voltages are needed.

Thus, the detailed logic control diagram of scheme 2 may refer to fig. 5, and specifically includes:

s51: respectively obtaining the brightness maximum value L of 4 types of sub-pixels in a frame picture _RMAX 、L _GMAX 、L _BMAX And L _WMAX ；

S52: according to L respectively _RMAX 、L _GMAX 、L _BMAX And L _WMAX Determining four corresponding groups of data voltages Vdata;

s53: according to the data voltage Vdata, 4 groups of gamma voltages VG1-VG9 corresponding to RGBW are respectively determined;

s54: judging whether VG1 in each group of Gamma voltages is larger than 12V or not respectively;

S55A: if yes, setting AVDD of the corresponding group to be more than or equal to VG1;

S55B: if not, avdd=12v is set;

s56: judging whether each group of AVDD is smaller than 16.5V or not respectively;

S57A: if yes, setting AVDD=VG1, and meeting the requirement of not less than 12V;

S57B: if not, avdd=16.5v is set.

According to the scheme, 4 groups of Gamma voltages are formed according to the 4 types of sub-pixels. For convenient control, 4 Gamma circuits can be arranged in the TCON circuit board, one Gamma circuit corresponds to one type of sub-pixel, the PMIC respectively inputs each group of determined target AVDD voltage into the Gamma circuit of the corresponding pixel, then the 4 groups of Gamma circuits output 4 groups of VG1 voltages to the Source drive integrated circuit Source-IC, and the Source drive integrated circuit Source-IC respectively determines the corresponding data voltage Vdata according to the 4 groups of VG1 voltages so as to drive all the similar sub-pixels to emit light under the corresponding data voltage Vdata.

Scheme 3: the target object is P sub-pixel groups in the display panel, each sub-pixel group comprises at least one type of sub-pixel, the display driving device comprises P groups of gamma circuits, one sub-pixel group corresponds to one group of gamma circuits, and P is more than or equal to 2 and is an integer.

The sub-pixels may be grouped according to actual requirements, for example, in the case that RGB sub-pixels form a pixel unit, the sub-pixels may be grouped into: r group, GB group; or RG, B. For the case where the RGBW sub-pixels constitute one pixel unit, it may be grouped as: RG group, BW group; or RB group, GW group, R group, G group, BW group, etc.

In accordance with the aspect 3, the display driving apparatus is configured to:

for each sub-pixel group, obtaining the required brightness of all similar sub-pixels in the sub-pixel group in the current frame and determining the maximum value of the required brightness; determining a corresponding gamma voltage maximum for a required brightness maximum of each sub-pixel group; for each sub-pixel group, the control power management integrated circuit outputs a target AVDD voltage to the corresponding gamma circuit.

After the sub-pixels are grouped, the scheme 3 can respectively obtain the required brightness of all the sub-pixels in each group of sub-pixels, determine the maximum brightness of each group of sub-pixels, and then respectively obtain the data voltage Vdata corresponding to each group of sub-pixels according to the maximum brightness of each group of sub-pixels in each frame picture.

Taking the packet manner of RG and BW as an example, the detailed logic control diagram of scheme 3 may refer to fig. 6, which specifically includes:

s61: respectively obtaining the brightness maximum value L of two groups of sub-pixels in a frame picture _RGMAX And L _BWMAX ；

S62: according to L respectively _RGMAX 、L _BWMAX Determining two corresponding groups of data voltages Vdata;

s63: according to the data voltage V _data Respectively determining two groups of corresponding gamma voltages VG1-VG 9;

s64: judging whether VG1 in each group of Gamma voltages is larger than 12V or not respectively;

S65A: if yes, setting AVDD of the corresponding group to be more than or equal to VG1;

S65B: if not, avdd=12v is set;

s66: judging whether each group of AVDD is smaller than 16.5V or not respectively;

S67A: if yes, setting AVDD=VG1, and meeting the requirement of not less than 12V;

S67B: if not, avdd=16.5v is set.

According to the scheme, 2 groups of Gamma voltages are respectively formed according to 2 groups of sub-pixel groups. For convenient control, 2 Gamma circuits can be arranged in the TCON circuit board, one Gamma circuit corresponds to one sub-pixel group, the PMIC respectively inputs each determined target AVDD voltage group into the Gamma circuit corresponding to the sub-pixel group, then the 2 Gamma circuits output 2 VG1 voltages to the Source drive integrated circuit Source-IC, and the Source drive integrated circuit Source-IC respectively determines the corresponding data voltage Vdata according to the 2 VG1 voltages so as to drive all the sub-pixels in the sub-pixel group to emit light under the corresponding data voltage Vdata.

In general, the above scheme determines the corresponding maximum data voltage according to the maximum brightness of the actual demand of the target object, and further determines the corresponding target AVDD voltage, thereby realizing the adaptive adjustment of the AVDD voltage value according to the brightness of the actual display picture, instead of setting the AVDD voltage to a fixed maximum value, and realizing the technical effect of reducing the logic power consumption.

In a second alternative embodiment, referring to fig. 7, a display driving method is provided, based on the same inventive concept, and is applied to the display driving apparatus provided in the first embodiment, including:

s71: in each frame display period, obtaining the maximum value of the required brightness of a target object in a display panel in a current frame;

s72: determining the maximum value of gamma voltage according to the maximum value of the required brightness;

s73: determining a target AVDD voltage according to the maximum value of the gamma voltage, and controlling the power management integrated circuit to output the target AVDD voltage to a gamma circuit corresponding to the target object; the target AVDD voltage is not lower than the gamma voltage maximum value.

the method for obtaining the required brightness maximum value of the target object in the display panel in the current frame comprises the following steps:

acquiring the required brightness of all the sub-pixels in all the sub-display areas in the current frame, and determining the maximum value of the required brightness and a target sub-display area corresponding to the maximum value of the required brightness;

controlling the power management integrated circuit to output a target AVDD voltage to a gamma circuit corresponding to the target object, comprising:

and controlling the power management integrated circuit to output the target AVDD voltage to the gamma circuit corresponding to the target sub-display area.

In some embodiments, the target object is M types of sub-pixels in the display panel, wherein one type of sub-pixels is correspondingly provided with a group of gamma circuits, and M is more than or equal to 3 and is an integer;

for each type of sub-pixel, obtaining the required brightness of all the same type of sub-pixels and determining the maximum value of the required brightness;

determining a gamma voltage maximum according to the required brightness maximum, including:

determining a corresponding gamma voltage maximum value according to the required brightness maximum value of each type of sub-pixel;

for each type of sub-pixel, the control power management integrated circuit outputs a target AVDD voltage to the corresponding gamma circuit.

In some embodiments, the target object is P sub-pixel groups in the display panel, each sub-pixel group comprises at least one type of sub-pixel, one sub-pixel group is correspondingly provided with a group of gamma circuits, and P is more than or equal to 2 and is an integer;

for each sub-pixel group, obtaining the required brightness of all similar sub-pixels in the sub-pixel group in the current frame and determining the maximum value of the required brightness;

determining a corresponding gamma voltage maximum for a required brightness maximum of each sub-pixel group;

for each sub-pixel group, the control power management integrated circuit outputs a target AVDD voltage to the corresponding gamma circuit.

In some embodiments, determining the target AVDD voltage from the gamma voltage maximum value includes:

if the maximum value of the gamma voltage is smaller than or equal to the first set value, determining the target AVDD voltage as the first set value;

if the gamma voltage maximum value is larger than the first set value and smaller than the second set value, determining the target AVDD voltage to be not lower than the gamma voltage maximum value;

In some embodiments, determining the gamma voltage maximum based on the desired brightness maximum comprises:

the gamma voltage maximum value is determined according to the data voltage.

In a third aspect, referring to fig. 8, in another alternative embodiment, a display module is provided, which includes a display panel and a display driving device provided in the embodiment of the first aspect, based on the same inventive concept. Optionally, the wiring area of the display panel includes a Source driver integrated circuit Source IC disposed on the flip chip film, and the flip chip film is connected to a circuit board XPCB, and the XPCB is connected to the display driver through a flexible circuit board FPC. The display panel may be an OLED display panel, a Quantum dot light emitting diode (Quantum Dot Light Emitting Diodes, QLED) display panel, an MLED display panel (including Mini-LED sub-millimeter light emitting diodes, micro-LED Micro light emitting diodes), or the like.

In a fourth aspect, referring to fig. 9, in another alternative embodiment, a display device is provided, including the display module provided in the third aspect, based on the same inventive concept. The display device can be a smart phone, a tablet personal computer, a vehicle-mounted display screen, a television, a computer display, a conference integrated machine and the like.

The technical effects of the display module provided by the third embodiment and the display device provided by the fourth embodiment of the present application can be referred to in the related content of the first embodiment, and are not described herein.

While preferred embodiments of the present application have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiments and all such alterations and modifications as fall within the scope of the application.

It will be apparent to those skilled in the art that various modifications and variations can be made to the present application without departing from the spirit or scope of the application. Thus, it is intended that the present application also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.

Claims

1. The display driving device is characterized by comprising a time sequence control circuit, a power management integrated circuit and a gamma circuit, wherein the input end of the gamma circuit is connected with the power management integrated circuit, and the output end of the gamma circuit is connected with a source electrode driving integrated circuit of a display panel; the timing control circuit is coupled to the power management integrated circuit and the gamma circuit and configured to:

2. The display driving apparatus according to claim 1, wherein the target object is N sub-display areas in the display panel, N >1 and is an integer;

the timing control circuit is configured to:

3. The display driving device according to claim 1, wherein the target object is M types of sub-pixels in the display panel, the display driving device includes M groups of gamma circuits, one type of sub-pixel corresponds to one group of gamma circuits, and M is equal to or greater than 3 and is an integer;

the timing control circuit is configured to:

4. The display driving device according to claim 1, wherein the target object is P sub-pixel groups in the display panel, each sub-pixel group including at least one type of sub-pixel, the display driving device including P groups of gamma circuits, one of the sub-pixel groups corresponding to one group of gamma circuits, P being equal to or greater than 2 and being an integer;

the timing control circuit is configured to:

5. The display driving apparatus according to claim 1, wherein the timing control circuit is configured to:

6. The display driving device according to claim 5, wherein the range of the first set value is 6V to 12V, and the range of the second set value is 16V to 17V.

7. The display driving apparatus according to claim 1, wherein the timing control circuit is configured to:

8. A display driving method applied to the display driving module according to any one of claims 1 to 7, the method comprising:

9. A display module comprising a display panel and a display driving device according to any one of claims 1 to 7.

10. A display device comprising the display module of claim 9.