CN114187871A

CN114187871A - Voltage adjusting method and device and electronic equipment

Info

Publication number: CN114187871A
Application number: CN202111508555.3A
Authority: CN
Inventors: 高雪岭; 谭仲齐; 周坤
Original assignee: Beijing Orende Microelectronics Technology Co ltd
Current assignee: Beijing Orende Microelectronics Technology Co ltd
Priority date: 2021-12-10
Filing date: 2021-12-10
Publication date: 2022-03-15
Anticipated expiration: 2041-12-10
Also published as: CN114187871B

Abstract

The present disclosure relates to a voltage adjustment method, an apparatus, and an electronic device, the method is used for adjusting a reset voltage of a pixel circuit of a self-luminous display panel, and the method includes: determining a first gray scale of a currently displayed N-1 th frame display image and a second gray scale of an N-th frame display image to be displayed; determining a first reset voltage corresponding to the Nth frame of display image according to the corresponding relation of the first gray scale, the second gray scale and a preset gray scale voltage; and when the display image of the N-1 th frame is displayed, resetting the pixel circuit by using the first reset voltage so as to display the display image of the N-1 th frame. The embodiment of the disclosure can dynamically adjust the reset voltage in the display preparation stage according to the gray data of two adjacent frames of images, so as to avoid the display panel from generating large brightness change when displaying the Nth frame of image, thereby improving the display accuracy.

Description

Voltage adjusting method and device and electronic equipment

Technical Field

The present disclosure relates to the field of display technologies, and in particular, to a voltage adjustment method and apparatus, and an electronic device.

Background

Currently, self-luminous display panels (such as OLED display panels) are widely used, and more electronic devices are equipped with the self-luminous display panels. However, the OLED display panel has a hysteresis effect, so that the display brightness of the OLED display panel may change, and when the OLED display panel switches from a dark image to a bright image, the display brightness of the OLED display panel may be lower than that in a normal display, and the image may not be accurately displayed.

Disclosure of Invention

According to an aspect of the present disclosure, there is provided a voltage adjusting method for adjusting a reset voltage of a pixel circuit of a self-luminous display panel, the method including:

determining a first gray scale of a currently displayed N-1 frame display image and a second gray scale of an N frame display image to be displayed, wherein the N frame display image is an adjacent next frame display image of the N-1 frame display image, and N is a positive integer;

determining a first reset voltage corresponding to the Nth frame of display image according to the corresponding relation of the first gray scale, the second gray scale and a preset gray scale voltage, wherein the corresponding relation of the preset gray scale voltage comprises the corresponding relation of at least one combination of the first preset gray scale and the second preset gray scale and the preset reset voltage;

and when the display image of the N-1 th frame is displayed, resetting the pixel circuit by using the first reset voltage so as to display the display image of the N-1 th frame.

In one possible embodiment, the method further comprises:

when the display of the nth frame display image is finished, adjusting the reset voltage from the first reset voltage to an initial reset voltage, and resetting the pixel circuit by using the initial reset voltage to display an N +1 th frame display image, wherein the N +1 th frame display image is an adjacent next frame display image of the nth frame display image, and the potential of the initial reset voltage is lower than the first reset voltage.

In a possible embodiment, if the first gray scale is equal to or higher than the second gray scale, the obtained first reset voltage is an initial reset voltage; and if the first gray scale is smaller than the second gray scale, the obtained potential of the first reset voltage is higher than the initial reset voltage.

In one possible implementation, the magnitude of the first reset voltage is positively correlated to the difference between the first gray scale and the second gray scale.

In a possible embodiment, the preset gray voltage correspondence relationship includes N first preset grays, N second preset grays and a plurality of preset reset voltages, any combination of the first preset grays and the second preset grays has a correspondence relationship with the preset reset voltage, and the potential of the preset reset voltage is positively correlated with the gray difference value of the first preset grays and the second preset grays.

In one possible embodiment, the minimum gray values of the N first preset grays and the N second preset grays are all 0, and the maximum gray values are all 255.

In a possible embodiment, if the first gray scale is between any two first preset gray scales and/or the second gray scale is between any two second preset gray scales, the method further includes:

and determining the first reset voltage by utilizing an interpolation method and the corresponding relation of the preset gray voltage.

In a possible implementation manner, the preset grayscale voltage correspondence relationship is configured in a lookup table, the lookup table includes a first data axis, a second data axis, and a voltage axis, the first data axis corresponds to an N-1 th frame image currently displayed, the second data axis corresponds to an N-th frame image to be displayed, N points are arranged on the first data axis and the second data axis and respectively correspond to each first preset grayscale and each second preset grayscale, and the voltage axis includes a plurality of preset reset voltages.

In one possible implementation, the pixel circuit includes a first charging transistor, a second charging transistor, a third charging transistor, an energy storage capacitor, a first control transistor, a second control transistor, a third control transistor, and a reset transistor, wherein,

a first terminal of the first charging transistor is connected to a data voltage line, a control terminal of the first charging transistor is used for receiving a control signal, a second terminal of the first charging transistor is connected to a first terminal of the first control transistor and a first terminal of the second charging transistor,

the control end of the second charging transistor is connected with the first end of the energy storage capacitor, the first end of the third charging transistor and the first end of the reset transistor, the second end of the second charging transistor is connected with the first end of the second control transistor and the second end of the third charging transistor,

the control ends of the first control transistor and the second control transistor are used for receiving emission signals, the second end of the second control transistor is connected with the first end of the third control transistor and the light-emitting element, the second end of the third control transistor is used for receiving reset voltage, and the control end of the third control transistor is used for receiving control signals,

a second terminal of the reset transistor is for receiving a reset voltage, a control terminal of the reset transistor is for receiving a reset signal,

and the second end of the energy storage capacitor is connected to the second end of the first control transistor and a power supply voltage line and used for receiving power supply voltage.

In one possible embodiment, the light-emitting element comprises an organic light-emitting diode OLED.

In one possible embodiment, the first gray scale is an average gray scale of the display image of the N-1 th frame, and the second gray scale is an average gray scale of the display image of the N-th frame.

According to an aspect of the present disclosure, there is provided a voltage adjusting apparatus for adjusting a reset voltage of a pixel circuit of a self-luminous display panel, the apparatus including:

the first determining module is used for determining the first gray scale of the currently displayed N-1 frame display image and the second gray scale of the N frame display image to be displayed, wherein the N frame display image is the next adjacent frame display image of the N-1 frame display image;

a second determining module, configured to determine a first reset voltage corresponding to the nth frame of display image according to a corresponding relationship between the first gray scale, the second gray scale, and a preset gray scale voltage, where the preset gray scale voltage corresponding relationship includes a corresponding relationship between at least one combination of a first preset gray scale and a second preset gray scale and a preset reset voltage;

and the control module is used for resetting the pixel circuit by using the first reset voltage when the display image of the N-1 th frame is displayed so as to display the display image of the N-th frame.

In one possible embodiment, the control module is further configured to:

In a possible embodiment, the preset gray voltage correspondence relationship includes N first preset grays, N second preset grays and a plurality of preset reset voltages, any combination of the first preset grays and the second preset grays has a correspondence relationship with the preset reset voltage, the potential of the preset reset voltage is positively correlated with the gray difference value between the first preset grays and the second preset grays, and N is a positive integer.

In a possible embodiment, if the first gray scale is between any two first preset gray scales and/or the second gray scale is between any two second preset gray scales, the second determining module is further configured to:

According to an aspect of the present disclosure, there is provided an electronic device including the voltage adjustment apparatus.

In one possible implementation, the electronic device comprises a display, a smartphone, or a portable device.

According to an aspect of the present disclosure, there is provided an electronic device including: a processor; a memory for storing processor-executable instructions; wherein the processor is configured to invoke the memory-stored instructions to perform the above-described method.

According to an aspect of the present disclosure, there is provided a computer readable storage medium having stored thereon computer program instructions which, when executed by a processor, implement the above-described method.

In various aspects of the embodiments of the present disclosure, a first gray scale of a currently displayed N-1 th frame display image and a second gray scale of an N-th frame display image to be displayed are determined, where the N-th frame display image is an adjacent next frame display image of the N-1 th frame display image; determining a first reset voltage corresponding to the Nth frame of display image according to the corresponding relation of the first gray scale, the second gray scale and a preset gray scale voltage, wherein the corresponding relation of the preset gray scale voltage comprises the corresponding relation of at least one combination of the first preset gray scale and the second preset gray scale and the preset reset voltage; when the display image of the (N-1) th frame is displayed, the pixel circuit is reset by using the first reset voltage so as to display the display image of the (N) th frame, and thus, the embodiment of the disclosure can dynamically adjust the reset voltage in the display preparation stage according to the gray data of two adjacent frames of images so as to avoid the display panel from generating large brightness change when the display panel displays the image of the (N) th frame, thereby improving the display accuracy.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure. Other features and aspects of the present disclosure will become apparent from the following detailed description of exemplary embodiments, which proceeds with reference to the accompanying drawings.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and, together with the description, serve to explain the principles of the disclosure.

Fig. 1 shows a luminance diagram of display panel display switching.

Fig. 2 shows a schematic diagram of a pixel circuit according to an embodiment of the present disclosure.

Fig. 3 illustrates an operation timing diagram of a pixel circuit according to an embodiment of the present disclosure.

Fig. 4 shows a voltage timing chart of the node N1 of the storage capacitor in the pixel circuit, and fig. 5 shows a current timing chart of the light emitting element.

FIG. 6 shows a flow chart of a voltage-based adjustment method according to an embodiment of the present disclosure.

Fig. 7 shows a schematic diagram of a voltage adjustment method according to an embodiment of the present disclosure.

Fig. 8 is a schematic diagram illustrating a preset gray voltage relationship according to an embodiment of the present disclosure, and fig. 9 is a schematic diagram illustrating a preset gray voltage relationship according to an embodiment of the present disclosure.

Fig. 10 shows a timing diagram of adjusting a reset voltage by using the voltage adjusting method according to the embodiment of the disclosure.

Fig. 11 shows a block diagram of a voltage adjustment apparatus according to an embodiment of the present disclosure.

FIG. 12 shows a block diagram of an electronic device in accordance with an embodiment of the present disclosure.

Detailed Description

Various exemplary embodiments, features and aspects of the present disclosure will be described in detail below with reference to the accompanying drawings. In the drawings, like reference numbers can indicate functionally identical or similar elements. While the various aspects of the embodiments are presented in drawings, the drawings are not necessarily drawn to scale unless specifically indicated.

In the description of the present disclosure, it is to be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, as used herein, refer to an orientation or positional relationship indicated in the drawings, which is solely for the purpose of facilitating the description and simplifying the description, and does not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and, therefore, should not be taken as limiting the present disclosure.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present disclosure, "a plurality" means two or more unless specifically limited otherwise.

In the present disclosure, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integral; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present disclosure can be understood by those of ordinary skill in the art as appropriate.

The word "exemplary" is used exclusively herein to mean "serving as an example, embodiment, or illustration. Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments.

The term "and/or" herein is merely an association describing an associated object, meaning that three relationships may exist, e.g., a and/or B, may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the term "at least one" herein means any one of a plurality or any combination of at least two of a plurality, for example, including at least one of A, B, C, and may mean including any one or more elements selected from the group consisting of A, B and C.

Furthermore, in the following detailed description, numerous specific details are set forth in order to provide a better understanding of the present disclosure. It will be understood by those skilled in the art that the present disclosure may be practiced without some of these specific details. In some instances, methods, means, elements and circuits that are well known to those skilled in the art have not been described in detail so as not to obscure the present disclosure.

Referring to fig. 1, fig. 1 shows a luminance diagram of a display panel during display switching.

In combination with the description of the background art, when the OLED display panel switches from a darker image to a brighter image for display, the display brightness of the OLED display panel is lower than that in normal display, and particularly, if the display image of the N-1 th frame is a black image and the display image of the next frame (the nth frame) is a white image, the brightness of the white image is reduced to some extent. For example, as shown in fig. 1, the OLED display panel displays a black image (i.e., Gray 0) and a white image (i.e., Gray 255) in the left half and the right half of the display image of the N-1 th frame of the OLED display panel, respectively. Then, the OLED display panel displays white images on the left half display image and the right half display image of the Nth frame. In the luminance measurement, the luminance of the white image displayed in the display image of the (N-1) th frame and the luminance of the white image displayed in the display image of the (N) th frame are both 250 nits. However, the black image displayed in the display image of the N-1 th frame is displayed after the white image into which the display image of the N-1 th frame is switched, and the luminance of the white image is only 200nits, not 250 nits. As can be seen, when the display image is switched from dark to bright, the display brightness of the display panel is reduced, and the display image cannot be accurately displayed.

The pixel circuit of the embodiment of the disclosure may include at least one capacitor and a plurality of transistors, and the pixel circuit may include various implementations, such as 7T1C (7 transistors and one capacitor), 9T1C, 5T1C, and the like, where the capacitor may be an energy storage capacitor (or referred to as a holding capacitor, a storage capacitor) for holding the Data voltage Data. The self-light emitting unit is exemplarily described with a 7T1C pixel circuit, it should be understood that the embodiments of the present disclosure are not limited thereto, and in other embodiments, a person skilled in the art may change the 7T1C pixel circuit to obtain pixel circuits such as 9T1C and 5T1C, and the display device of the embodiments of the present disclosure may also be applied.

Referring to fig. 2, fig. 2 is a schematic diagram of a pixel circuit according to an embodiment of the disclosure.

In one example, as shown in fig. 2, the pixel circuit of the embodiment of the present disclosure includes a first charging transistor T7, a second charging transistor T3, a third charging transistor T2, and an energy storage capacitor C_stA first control transistor T5, a second control transistor T6, a third control transistor T4 and a reset transistor T1, wherein,

a first terminal of the first charging transistor T7 is connected to a Data voltage line Data, a control terminal of the first charging transistor T7 is configured to receive a control signal Gate, a second terminal of the first charging transistor T7 is connected to a first terminal of the first control transistor T5, a first terminal of the second charging transistor T3,

a control terminal of the second charging transistor T3 is connected to the first terminal of the storage capacitor Cst, the first terminal of the third charging transistor T2 and the first terminal of the reset transistor T1, a second terminal of the second charging transistor T3 is connected to the first terminal of the second control transistor T6 and the second terminal of the third charging transistor T2,

the control terminals of the first control transistor T5 and the second control transistor T6 are configured to receive an emission signal EM, the second terminal of the second control transistor T6 is connected to the first terminal of the third control transistor T4 and the light emitting element, the second terminal of the third control transistor T4 is configured to receive a reset voltage Vint, the control terminal of the third control transistor T4 is configured to receive a control signal Gate,

a second terminal of the Reset transistor T1 is for receiving a Reset voltage Vint, a control terminal of the Reset transistor T1 is for receiving a Reset signal Reset,

the second terminal of the storage capacitor Cst is connected to the second terminal of the first control transistor T5 and the power voltage line, and is configured to receive the power voltage ELVDD.

Illustratively, an EM signal is applied to the first control transistor T5 and the second control transistor T6 to control the switching of the OLED light emitting element, wherein the EM signal is active low to turn on the light emitting element and active high to turn off the light emitting element. The longer the second control transistor T6 is turned on represents that the OLED display device emits light for a longer time within one frame time, and the integrated luminance shows a linear increase with time.

Illustratively, the digital voltage signal Data is supplied to the point N1 and the energy storage capacitor C through the first charging transistor T7, the second charging transistor T3 and the third charging transistor T2_stCharging, the charged charge controls the carrier concentration flowing through the second charging transistor T3, and after charging, the charge is kept in the energy storage capacitor C_stIn the meantime, when the first charging transistor T7 and the third charging transistor T2 are turned off, and the ELVDD and ELVSS voltages are applied to both ends of the light emitting device after the first control transistor T5 and the second control transistor T6 are turned on, a current is formed through the second charging transistor T3, and the light emitting device controlled by the magnitude of the current shows different luminance.

In one example, as shown in fig. 3, the pixel circuit driving the light emitting element (e.g., OLED) to emit light includes at least three stages of a reset stage P1, a data receiving stage P2, and a light emitting stage P3.

In one example, the initial Reset voltage Vint is low, the Reset signal Reset is low during the Reset phase P1, and the Reset transistor is ResetT1 is turned on, the other transistors are turned off, the gate voltage of the second charging transistor T3 is pulled low, and the previous frame (N-1) data is cleared to ensure that the data of the next frame (N frame) can be correctly written into the energy storage capacitor C_stIn the reset phase P1, the voltage at the node N1 is equal to the initial reset voltage Vint.

In one example, in the Data receiving phase P2, the control signal Gate is at a low level, the first charging transistor T7, the third charging transistor T2, and the third control transistor T4 are turned on, the remaining transistors are kept off, the second charging transistor T3 is turned on (the on condition Vgs < Vth is satisfied), and the Data voltage Data starts to flow to the energy storage capacitor C_stAnd is charged until the voltage of the node N1 is equal to the sum of the Data voltage Data and Vth, at which time the second charging transistor T3 is turned off.

In one example, during the light-emitting period P3, the EM signal is pulled low, two voltages of ELVDD and ELVSS are applied across the light-emitting element, and the light-emitting element emits light.

Referring to fig. 4 and 5 together, fig. 4 shows a voltage timing diagram of the node N1 of the storage capacitor in the pixel circuit, and fig. 5 shows a current timing diagram of the light emitting device.

In one example, as shown in FIG. 4, for a pixel circuit displaying black pixels in the N-1 th frame display image and white pixels in the N-1 th frame display image, there is a gate voltage difference (i.e., Δ V) between the gate voltage of the N-1 th frame and the gate voltage of the N-th frame_G1). After the display preparation phase completes the reset and the writing of the display data of the Nth frame, it can be seen that the gate voltage difference still cannot be completely eliminated (Δ V still exists)_G2). The display preparation phase mentioned in the embodiments of the present disclosure at least includes a reset phase and a data receiving phase.

In one example, as shown in connection with FIG. 5, the gate voltage difference (Δ V)_G2) Resulting in a current difference of a certain degree between the OLED current of the N-1 frame and the OLED current of the nth frame of the OLED pixel driven by the pixel circuit. Therefore, as shown in fig. 1, the black image displayed in the display image of the N-1 th frame is displayed after the white image into which the display image of the N-1 th frame is switched, and the luminance of the white image is only 200nits, not 250 nits. Must speciallyIt should be noted that as the display frame is increased, the reset time and the display data writing time are also forced to be shortened, which results in the second gate voltage difference Δ V_G2The brightness of the white image is reduced more when the black image is switched to the white image.

According to the voltage adjustment method provided by the embodiment of the disclosure, a first gray scale of a currently displayed N-1 th frame display image and a second gray scale of an N-th frame display image to be displayed are determined, wherein the N-th frame display image is an adjacent next frame display image of the N-1 th frame display image; determining a first reset voltage corresponding to the Nth frame of display image according to the corresponding relation of the first gray scale, the second gray scale and a preset gray scale voltage, wherein the corresponding relation of the preset gray scale voltage comprises the corresponding relation of at least one combination of the first preset gray scale and the second preset gray scale and the preset reset voltage; when the display image of the (N-1) th frame is displayed, the pixel circuit is reset by using the first reset voltage so as to display the display image of the (N) th frame, and thus, the embodiment of the disclosure can dynamically adjust the reset voltage in the display preparation stage according to the gray data of two adjacent frames of images so as to avoid the display panel from generating large brightness change when the display panel displays the image of the (N) th frame, thereby improving the display accuracy.

The main body of the voltage-based adjustment method may be a voltage-based adjustment device. For example, the voltage-based adjustment method may be performed by a terminal device or a server or other processing device. The terminal device may be a User Equipment (UE), a mobile device, a User terminal, a handheld device, a computing device, or a vehicle-mounted device, and some examples of the terminal device are as follows: a Mobile Phone (Mobile Phone), a tablet computer, a notebook computer, a palm computer, a Mobile Internet Device (MID), a wearable device, a Virtual Reality (VR) device, an Augmented Reality (AR) device, a wireless terminal in Industrial Control (Industrial Control), a wireless terminal in unmanned driving (self driving), a wireless terminal in Remote Surgery (Remote medical Surgery), a wireless terminal in Smart Grid, a wireless terminal in Transportation Safety, a wireless terminal in Smart City (Smart City), a wireless terminal in Smart Home (Smart Home), a wireless terminal in car networking, and the like. For example, the server may be a local server or a cloud server.

In some possible implementations, the voltage-based adjustment method may be implemented by the processing component invoking computer-readable instructions stored in the memory. In one example, a processing component includes, but is not limited to, a single processor, or discrete components, or a combination of a processor and discrete components. The processor may comprise a controller having functionality to execute instructions in an electronic device, which may be implemented in any suitable manner, e.g., by one or more Application Specific Integrated Circuits (ASICs), Digital Signal Processors (DSPs), Digital Signal Processing Devices (DSPDs), Programmable Logic Devices (PLDs), Field Programmable Gate Arrays (FPGAs), controllers, micro-controllers, microprocessors or other electronic components. Within the processor, the executable instructions may be executed by hardware circuits such as logic gates, switches, Application Specific Integrated Circuits (ASICs), programmable logic controllers, and embedded microcontrollers. As shown in fig. 6, the voltage-based adjustment method for adjusting the reset voltage of the pixel circuit of the self-light emitting display panel includes steps S11 to S13.

Step S11, determining a first gray scale of a currently displayed N-1 frame display image and a second gray scale of an N frame display image to be displayed, wherein the N frame display image is an adjacent next frame display image of the N-1 frame display image, and N is a positive integer;

step S12, determining a first reset voltage corresponding to the nth frame of display image according to a corresponding relationship between the first gray scale, the second gray scale and a preset gray scale voltage, where the preset gray scale voltage corresponding relationship includes a corresponding relationship between at least one combination of a first preset gray scale and a second preset gray scale and a preset reset voltage;

step S13, when the display image of the N-1 th frame is completed, resetting the pixel circuit by using the first reset voltage to display the display image of the N-1 th frame.

The gray scale of the display image mentioned in the embodiments of the present disclosure may be determined in various ways, for example, in one possible implementation, the gray scale of the display image may be an average gray scale, that is, the first gray scale is an average gray scale of the display image of the N-1 th frame, and the second gray scale is an average gray scale of the display image of the N-th frame, and of course, the gray scale of the display image may also be a maximum gray scale of an area determined according to the display weight, or a maximum average gray scale of average gray scales in each area, and the embodiments of the present disclosure are not limited thereto.

Although the disclosed embodiments are described in terms of gray scale, it should be understood that in other embodiments, brightness, display data, etc. may be substituted as appropriate.

Referring to fig. 7, fig. 7 is a schematic diagram illustrating a voltage adjustment method according to an embodiment of the disclosure.

In one possible embodiment, as shown in fig. 7, the method further comprises:

step S14, when the display of the nth frame display image is completed, adjusting the reset voltage from the first reset voltage to an initial reset voltage, and resetting the pixel circuit by using the initial reset voltage to display an N +1 th frame display image, where the N +1 th frame display image is an adjacent next frame display image of the nth frame display image, and a potential of the initial reset voltage is lower than the first reset voltage.

According to the embodiment of the disclosure, when the display of the nth frame display image is completed, the reset voltage is adjusted from the first reset voltage to the initial reset voltage, and the pixel circuit is reset by using the initial reset voltage to display the (N + 1) th frame display image, so that the reset voltage can be recovered as the initial reset voltage after the adjustment of the nth frame display image, and the brightness transition adjustment of the subsequent (N + 1) th frame display image is avoided.

Various aspects of the voltage adjustment method of the embodiments of the present disclosure are exemplarily described below.

For example, in the embodiment of the present disclosure, when the grayscale of the display image of the nth frame is higher than the grayscale of the display image of the N-1 st frame, the embodiment of the present disclosure may perform a display preparation operation using a first reset voltage higher than an initial reset voltage, for example, reset the pixel circuit, receive display data of the display image of the nth frame, and the like, and increase the display brightness of the display brighter image, so as to normally display the display image of the nth frame; when the gray scale of the display image of the nth frame is equal to or lower than the gray scale of the display image of the (N-1) th frame, the reset voltage in the display preparation stage is not adjusted and is kept as the initial reset voltage.

The embodiment of the disclosure sets the magnitude of the first reset voltage to be positively correlated with the difference between the first gray scale and the second gray scale, so that a proper reset voltage can be flexibly and adaptively determined according to the difference between the gray scale of the nth frame display image and the gray scale of the N-1 th frame display image, so as to further improve the accuracy of image display, for example, if the gray scale difference between the gray scale of the nth frame display image and the gray scale of the N-1 th frame display image is large, the reset voltage of the nth frame display image is set to be a large value; if the gray scale difference between the gray scale of the display image of the Nth frame and the gray scale of the display image of the (N-1) th frame is small, the reset voltage of the display image of the Nth frame is set to be a small value so as to realize the compensation adaptability and flexibility of the reset voltage.

The specific size of N is not limited in the embodiments of the present disclosure, and those skilled in the art can set the size according to actual situations and needs.

In a possible implementation manner, the preset grayscale voltage correspondence relationship is configured in a lookup table, for example, the lookup table includes a first data axis, a second data axis, and a voltage axis, the first data axis corresponds to the currently displayed N-1 th frame image, the second data axis corresponds to the N-th frame image to be displayed, N points are arranged on the first data axis and the second data axis and respectively correspond to each of the first preset grayscale and each of the second preset grayscale, and the voltage axis includes a plurality of preset reset voltages.

Referring to fig. 8 and 9, fig. 8 is a schematic diagram illustrating a preset gray voltage relationship according to an embodiment of the disclosure, and fig. 9 is a schematic diagram illustrating a preset gray voltage relationship according to an embodiment of the disclosure.

In one example, as shown in fig. 8, the lookup table may include N, for example, 8 first preset grays and 8 second preset grays, which are Gray0, Gray 32, Gray 64, Gray 128, Gray 160, Gray 192, Gray 224, and Gray 255, respectively, and a combination of each first preset grayscale and each second preset grayscale may determine a corresponding preset reset voltage, where X represents the initial reset voltage Vref.

In one example, as shown in fig. 9, a first data axis corresponding to the display image of the N-1 th frame and a second data axis corresponding to the display image of the N-th frame are provided with N points, where N is a positive integer. For example, there are 8 points, Gray0, Gray 32, Gray 64, Gray 128, Gray 160, Gray 192, Gray 224, and Gray 255, respectively.

In one example, the preset read voltage relationship may be that, in the case where the second preset gray scale is greater than the first preset gray scale, any one of the first preset gray scales is fixed, the corresponding preset reset voltage is larger and larger along with the increase of the second preset gray scale, that is, as the gray difference between the second preset gray and the first preset gray increases, the corresponding preset reset voltage becomes larger, for example, as shown in fig. 8 and 9, when the first preset Gray level is fixed to Gray0, the preset reset voltages corresponding to the Gray levels (Gray 0, Gray 32, Gray 64, Gray 128, Gray 160, Gray 192, Gray 224, and Gray 255) of the second preset Gray level become larger, i.e., Vref, Vint0, Vint1, Vint2, Vint3, Vint4, Vint5, Vint6, are increasingly larger, i.e., in the embodiment of the present disclosure, the initial preset reset voltage Vref is less than each of the other preset reset voltages.

The adjustment of the reset voltage by the voltage adjustment method according to the embodiment of the present disclosure is exemplarily described below.

For example, when the voltage adjustment method of the embodiment of the present disclosure is used to adjust the reset voltage, a first gray scale of a currently displayed display image of an N-1 th frame and a second gray scale of a display image of an N-th frame to be displayed may be determined;

in a case of obtaining a first Gray scale and a second Gray scale, a first reset voltage corresponding to the nth frame of display image may be determined according to a corresponding relationship between the first Gray scale, the second Gray scale and a preset Gray scale voltage, in an example, the first Gray scale is Gray0 (i.e., a black image is displayed) and the second Gray scale is Gray 64, at this time, a reset voltage of the nth frame of display image in a display preparation phase (reset and display data write) may be found to be Vint1 from the preset Gray scale voltage corresponding relationship (e.g., through a lookup table). In another example, the first Gray scale is Gray 160 and the second Gray scale is Gray 255, and the reset voltage of the nth frame of display image in the display preparation phase (reset and display data write) can be found from the preset Gray scale voltage corresponding relation (e.g. by using a lookup table) to be Vint 24;

for example, in some cases, if the obtained first gray scale and the second gray scale are not identical to the first preset gray scale and the second preset gray scale in the preset gray scale voltage relationship, the embodiment of the present disclosure may obtain the corresponding first reset voltage in various ways.

For example, in a possible implementation, if the first gray scale is between any two first preset gray scales and/or the second gray scale is between any two second preset gray scales, the method may further include:

For example, a linear relationship (may also be a non-linear relationship) may be established according to the N first preset grayscales, the N second preset grayscales and the preset reference voltages corresponding to each pair of the first preset grayscales and the second preset grayscales, so that the first reset voltage of any combination of the first grayscales and any combination of the second grayscales may be determined according to the linear relationship.

Of course, the embodiments of the present disclosure may also determine the first reset voltage corresponding to the first gray scale and the second gray scale in a fuzzy manner, for example, determine the first preset gray scale and the second preset gray scale that are closest to the first gray scale and the second gray scale in the lookup table, and determine the first reset voltage by using the preset reset voltage corresponding to the first preset gray scale and the second preset gray scale that are closest to each other.

It can be seen that, in the embodiment of the present disclosure, the form of the preset gray voltage relationship is not limited (may be a linear or nonlinear functional relationship, may be a table form, may be a space mapping form, and may also be other relational data forms, such as a database), and for different preset gray voltage relationships, when determining the first reset voltage corresponding to the first gray scale and the second gray scale, different methods may be sampled, and thus, the embodiment of the present disclosure is not limited.

In the case of obtaining the first reset voltage, when the display image of the nth-1 frame is displayed, the embodiment of the present disclosure may enter a display preparation stage of a display image of an actual nth frame, and reset the pixel circuit by using the first reset voltage (including an acquisition process of the display data after the reset and other preparation processes, which are not limited in the embodiment of the present disclosure) to display the display image of the nth frame. The embodiment of the disclosure can dynamically adjust the reset voltage in the display preparation stage according to the gray data of two adjacent frames of images, so as to avoid the display panel from generating large brightness change when displaying the Nth frame of image, thereby improving the display accuracy.

Referring to fig. 10, fig. 10 is a timing diagram illustrating a reset voltage adjustment performed by the voltage adjustment method according to the embodiment of the disclosure.

In one example, as shown in FIG. 10, for a pixel circuit displaying black pixels in the N-1 th frame display image and white pixels in the N-1 th frame display image, there is a gate voltage difference between the gate voltage of the N-1 th frame display image and the gate voltage of the N-1 th frame display image, and this gate voltage difference causes a current difference to occur to some extent between the OLED current of the N-1 th frame display image and the OLED current of the N-1 th frame display image of the OLED sub-pixel driven by the pixel circuit. As shown in fig. 10, in the case of applying the dynamic voltage adjustment method implemented by the present disclosure, the value of the reset voltage VINT of the display image of the nth frame is dynamically adjusted from-3.1V to-5.0V (the absolute value becomes larger, i.e., the potential increases), so that the current difference is greatly reduced (8% → 3%).

The voltage adjustment method according to the embodiment of the present disclosure dynamically adjusts the reset voltage (which may also be referred to as an initialization voltage) of the pixel circuit when the gray scale of the display image of the N-1 th frame and the gray scale of the display image of the N-th frame are different, and thus, the embodiment of the present disclosure minimizes an adverse effect (a decrease in luminance) on the luminance of the display image of the N-th frame due to the significant difference, thereby improving the display accuracy.

It is understood that the above-mentioned method embodiments of the present disclosure can be combined with each other to form a combined embodiment without departing from the logic of the principle, which is limited by the space, and the detailed description of the present disclosure is omitted. Those skilled in the art will appreciate that in the above methods of the specific embodiments, the specific order of execution of the steps should be determined by their function and possibly their inherent logic.

Referring to fig. 11, fig. 11 is a block diagram of a voltage adjustment apparatus according to an embodiment of the disclosure.

The device is used for adjusting the reset voltage of the pixel circuit of the self-luminous display panel, as shown in figure 1, the device comprises:

a first determining module 10, configured to determine a first gray scale of an N-1 th frame display image currently displayed and a second gray scale of an N-th frame display image to be displayed, where the N-th frame display image is an adjacent next frame display image of the N-1 th frame display image;

a second determining module 20, configured to determine a first reset voltage corresponding to the nth frame of display image according to a corresponding relationship between the first gray scale, the second gray scale and a preset gray scale voltage, where the corresponding relationship between the preset gray scale voltage and the preset reset voltage includes a corresponding relationship between at least one combination of a first preset gray scale and a second preset gray scale;

and the control module 30 is configured to reset the pixel circuit by using the first reset voltage when the display image of the nth-1 frame is completed, so as to display the display image of the nth frame.

The voltage adjusting device provided by the embodiment of the disclosure determines a first gray scale of a currently displayed (N-1) th frame display image and a second gray scale of an N (N-1) th frame display image to be displayed, where the N-th frame display image is an adjacent next frame display image of the N-1 th frame display image; determining a first reset voltage corresponding to the Nth frame of display image according to the corresponding relation of the first gray scale, the second gray scale and a preset gray scale voltage, wherein the corresponding relation of the preset gray scale voltage comprises the corresponding relation of at least one combination of the first preset gray scale and the second preset gray scale and the preset reset voltage; when the display image of the (N-1) th frame is displayed, the pixel circuit is reset by using the first reset voltage so as to display the display image of the (N) th frame, and thus, the embodiment of the disclosure can dynamically adjust the reset voltage in the display preparation stage according to the gray data of two adjacent frames of images so as to avoid the display panel from generating large brightness change when the display panel displays the image of the (N) th frame, thereby improving the display accuracy.

In one possible embodiment, the control module is further configured to:

In some embodiments, functions of or modules included in the apparatus provided in the embodiments of the present disclosure may be used to execute the method described in the above method embodiments, and specific implementation thereof may refer to the description of the above method embodiments, and for brevity, will not be described again here.

Embodiments of the present disclosure also provide a computer-readable storage medium having stored thereon computer program instructions, which when executed by a processor, implement the above-mentioned method. The computer readable storage medium may be a non-volatile computer readable storage medium.

An embodiment of the present disclosure further provides an electronic device, including: a processor; a memory for storing processor-executable instructions; wherein the processor is configured to invoke the memory-stored instructions to perform the above-described method.

The disclosed embodiments also provide a computer program product comprising computer readable code or a non-transitory computer readable storage medium carrying computer readable code, which when run in a processor of an electronic device, the processor in the electronic device performs the above method.

The electronic device may be provided as a terminal, server, or other form of device.

Referring to fig. 12, fig. 12 is a block diagram of an electronic device according to an embodiment of the disclosure.

For example, the electronic device 800 may be a mobile phone, a computer, a digital broadcast terminal, a messaging device, a game console, a tablet device, a medical device, a fitness device, a personal digital assistant, or the like terminal.

Referring to fig. 12, electronic device 800 may include one or more of the following components: processing component 802, memory 804, power component 806, multimedia component 808, audio component 810, input/output (I/O) interface 812, sensor component 814, and communication component 816.

The processing component 802 generally controls overall operation of the electronic device 800, such as operations associated with display, telephone calls, data communications, camera operations, and recording operations. The processing components 802 may include one or more processors 820 to execute instructions to perform all or a portion of the steps of the methods described above. Further, the processing component 802 can include one or more modules that facilitate interaction between the processing component 802 and other components. For example, the processing component 802 can include a multimedia module to facilitate interaction between the multimedia component 808 and the processing component 802.

The memory 804 is configured to store various types of data to support operations at the electronic device 800. Examples of such data include instructions for any application or method operating on the electronic device 800, contact data, phonebook data, messages, pictures, videos, and so forth. The memory 804 may be implemented by any type or combination of volatile or non-volatile memory devices such as Static Random Access Memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, magnetic or optical disks.

The power supply component 806 provides power to the various components of the electronic device 800. The power components 806 may include a power management system, one or more power supplies, and other components associated with generating, managing, and distributing power for the electronic device 800.

The multimedia component 808 includes a screen that provides an output interface between the electronic device 800 and a user. In some embodiments, the screen may include a Liquid Crystal Display (LCD) and a Touch Panel (TP). If the screen includes a touch panel, the screen may be implemented as a touch screen to receive an input signal from a user. The touch panel includes one or more touch sensors to sense touch, slide, and gestures on the touch panel. The touch sensor may not only sense the boundary of a touch or slide action, but also detect the duration and pressure associated with the touch or slide operation. In some embodiments, the multimedia component 808 includes a front facing camera and/or a rear facing camera. The front camera and/or the rear camera may receive external multimedia data when the electronic device 800 is in an operation mode, such as a shooting mode or a video mode. Each front camera and rear camera may be a fixed optical lens system or have a focal length and optical zoom capability.

The audio component 810 is configured to output and/or input audio signals. For example, the audio component 810 includes a Microphone (MIC) configured to receive external audio signals when the electronic device 800 is in an operational mode, such as a call mode, a recording mode, and a voice recognition mode. The received audio signals may further be stored in the memory 804 or transmitted via the communication component 816. In some embodiments, audio component 810 also includes a speaker for outputting audio signals.

The I/O interface 812 provides an interface between the processing component 802 and peripheral interface modules, which may be keyboards, click wheels, buttons, etc. These buttons may include, but are not limited to: a home button, a volume button, a start button, and a lock button.

The sensor assembly 814 includes one or more sensors for providing various aspects of state assessment for the electronic device 800. For example, the sensor assembly 814 may detect an open/closed state of the electronic device 800, the relative positioning of components, such as a display and keypad of the electronic device 800, the sensor assembly 814 may also detect a change in the position of the electronic device 800 or a component of the electronic device 800, the presence or absence of user contact with the electronic device 800, orientation or acceleration/deceleration of the electronic device 800, and a change in the temperature of the electronic device 800. Sensor assembly 814 may include a proximity sensor configured to detect the presence of a nearby object without any physical contact. The sensor assembly 814 may also include a light sensor, such as a Complementary Metal Oxide Semiconductor (CMOS) or Charge Coupled Device (CCD) image sensor, for use in imaging applications. In some embodiments, the sensor assembly 814 may also include an acceleration sensor, a gyroscope sensor, a magnetic sensor, a pressure sensor, or a temperature sensor.

The communication component 816 is configured to facilitate wired or wireless communication between the electronic device 800 and other devices. The electronic device 800 may access a wireless network based on a communication standard, such as a wireless network (WiFi), a second generation mobile communication technology (2G) or a third generation mobile communication technology (3G), or a combination thereof. In an exemplary embodiment, the communication component 816 receives a broadcast signal or broadcast related information from an external broadcast management system via a broadcast channel. In an exemplary embodiment, the communication component 816 further includes a Near Field Communication (NFC) module to facilitate short-range communications. For example, the NFC module may be implemented based on Radio Frequency Identification (RFID) technology, infrared data association (IrDA) technology, Ultra Wideband (UWB) technology, Bluetooth (BT) technology, and other technologies.

In an exemplary embodiment, the electronic device 800 may be implemented by one or more Application Specific Integrated Circuits (ASICs), Digital Signal Processors (DSPs), Digital Signal Processing Devices (DSPDs), Programmable Logic Devices (PLDs), Field Programmable Gate Arrays (FPGAs), controllers, micro-controllers, microprocessors or other electronic components for performing the above-described methods.

In an exemplary embodiment, a non-transitory computer-readable storage medium, such as the memory 804, is also provided that includes computer program instructions executable by the processor 820 of the electronic device 800 to perform the above-described methods.

Having described embodiments of the present disclosure, the foregoing description is intended to be exemplary, not exhaustive, and not limited to the disclosed embodiments. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen in order to best explain the principles of the embodiments, the practical application, or improvements made to the technology in the marketplace, or to enable others of ordinary skill in the art to understand the embodiments disclosed herein.

Claims

1. A voltage adjustment method for adjusting a reset voltage of a pixel circuit of a self-luminous display panel, comprising:

2. The method of claim 1, further comprising:

3. The method of claim 1, wherein if the first gray level is equal to or higher than the second gray level, the obtained first reset voltage is an initial reset voltage; and if the first gray scale is smaller than the second gray scale, the obtained potential of the first reset voltage is higher than the initial reset voltage.

4. The method according to claim 1, wherein the magnitude of the first reset voltage is positively correlated to the difference between the first gray scale and the second gray scale.

5. The method according to claim 1, wherein the preset gray voltage correspondence relationship comprises N first preset grays, N second preset grays and a plurality of preset reset voltages, any combination of the first preset grays and the second preset grays has a correspondence relationship with the preset reset voltage, and the potential of the preset reset voltage is positively correlated with the gray difference value between the first preset grays and the second preset grays.

6. The method of claim 5, wherein the minimum gray value of the N first predetermined grays and the minimum gray value of the N second predetermined grays are all 0, and the maximum gray values are all 255.

7. The method according to claim 5, wherein if the first gray scale is between any two first preset gray scales and/or the second gray scale is between any two second preset gray scales, the method further comprises:

8. The method according to any one of claims 5 to 7, wherein the preset gray voltage correspondence relationship is configured in a lookup table, the lookup table includes a first data axis, a second data axis and a voltage axis, the first data axis corresponds to the currently displayed N-1 frame image, the second data axis corresponds to the N-th frame image to be displayed, N points are arranged on the first data axis and the second data axis and respectively correspond to the first preset gray and the second preset gray, and the voltage axis includes a plurality of preset reset voltages.

9. The method of claim 1, wherein the pixel circuit comprises a first charge transistor, a second charge transistor, a third charge transistor, an energy storage capacitor, a first control transistor, a second control transistor, a third control transistor, and a reset transistor, wherein,

10. The method of claim 9, wherein the light-emitting element comprises an organic light-emitting diode (OLED).

11. The method of claim 1, wherein the first gray scale is an average gray scale of the display image of the N-1 th frame, and the second gray scale is an average gray scale of the display image of the N-th frame.

12. A voltage adjustment apparatus for adjusting a reset voltage of a pixel circuit of a self-luminous display panel, comprising:

13. An electronic device characterized in that it comprises a voltage adjustment apparatus according to claim 12.

14. The electronic device of claim 13, wherein the electronic device comprises a display, a smartphone, or a portable device.