CN117174009A

CN117174009A - Screen driving circuit, screen refreshing method and electronic equipment

Info

Publication number: CN117174009A
Application number: CN202210589122.3A
Authority: CN
Inventors: 苏懿; 安亚斌; 贺海明; 赵明远
Original assignee: Honor Device Co Ltd
Current assignee: Honor Device Co Ltd
Priority date: 2022-05-27
Filing date: 2022-05-27
Publication date: 2023-12-05

Abstract

A screen driving circuit, a screen refreshing method and electronic equipment relate to the technical field of terminals and the technical field of display screens. The screen driving circuit includes a pixel circuit, a display driving chip, a row driving circuit, and a column driving circuit. The line driving circuit generates a line driving signal for driving a pixel line of the screen; the column driving circuit inputs the data signal output by the display driving chip into the pixel circuit; the pixel circuit is used for refreshing the display content of the screen; the display driving chip sends a first enabling signal to the row driving circuit and sends a second enabling signal to the column driving circuit according to the pixels needing to be refreshed, so that when the first enabling signal and the second enabling signal are pulse signals, the screen performs local refreshing under the driving of the row driving circuit and the column driving circuit, and when the first enabling signal is of a first level and the second enabling signal is of a second level, the screen performs global refreshing under the driving of the row driving circuit and the column driving circuit. The scheme can reduce power consumption and reduce delay of screen refreshing.

Description

Screen driving circuit, screen refreshing method and electronic equipment

Technical Field

The present application relates to the field of terminal technologies, and in particular, to a screen driving circuit, a screen refreshing method, and an electronic device.

Background

At present, information is displayed on electronic devices such as mobile phones and tablet computers by using a display module, wherein the display module comprises a screen and a driving module of the screen.

At present, when a driving module of the electronic equipment drives a screen to display, the driving mode adopted is as follows: the data signal is written linearly under the drive of a line scanning signal (also called GOA or shift register), and the refreshing of the global content is realized through the writing of pixel signals on the whole surface of the screen.

The implementation always carries out global refreshing on the screen, and when only a small part of display contents needing to be updated on the screen, continuous global refreshing can cause high power consumption and high delay of screen refreshing.

Disclosure of Invention

In order to solve the problems, the application provides a screen driving circuit, a screen refreshing method and an electronic device, which can reduce power consumption and reduce delay of screen refreshing.

In a first aspect, the present application provides a screen driving circuit applied to an electronic device, the screen driving circuit comprising: pixel circuits, display driver chips, row driver circuits, and column driver circuits. The line driving circuit is used for generating line driving signals for driving pixel lines of the screen; the column driving circuit is used for inputting the data signals output by the display driving chip into the pixel circuit; the pixel circuit is used for refreshing the display content of the screen. The display driving chip is used for sending a first enabling signal to the row driving circuit according to the pixels needing to be refreshed, sending a second enabling signal to the column driving circuit, enabling the screen to be locally refreshed under the driving of the row driving circuit and the column driving circuit when the first enabling signal and the second enabling signal are pulse signals, and enabling the screen to be globally refreshed under the driving of the row driving circuit and the column driving circuit when the first enabling signal is a first level and the second enabling signal is a second level.

By utilizing the scheme provided by the embodiment of the application, the screen driving circuit has the functions of global refreshing and local refreshing. When the display driving chip realizes the function of local refreshing, only partial pixels with updated contents on the screen are refreshed, namely the local refreshing of the screen is realized, and the rest partial pixels without updated contents on the screen can keep original display without refreshing, so that the power consumption can be reduced, and the delay of the refreshing of the screen is reduced.

In one possible implementation manner, the display driving chip is specifically configured to make the output first enable signal be a first level when at least one of the local refresh reset signal and the local refresh enable signal is a second level, and make the output first enable signal be a second level otherwise; the ratio of the basic frame rate of the screen to the frequency of the local refresh reset signal is a positive integer, and the basic frame rate is the display frame rate currently adopted by the screen.

When the screen is locally refreshed, the refresh rate between pixels is different, so that the device characteristics of circuit devices corresponding to the pixels are different, namely, the drift of the device characteristics exists, and the inaccuracy of the image displayed by the screen is caused. Therefore, by setting the local refreshing reset signal, all pixels on the screen are refreshed uniformly according to a certain period, the drift of the characteristics of each device can be reduced or eliminated, and the quality of the display picture of the screen is improved.

In one possible implementation, the duration that the local refresh reset signal is at the first level is a first period of time, the period that the local refresh reset signal is at the second level is a second period of time, and the first period of time and the second period of time are fixed. I.e. the duty cycle of the partial refresh reset signal is fixed.

In one possible implementation, the duration of the partial refresh reset signal at the first level is a first period of time, the period of time the partial refresh reset signal is at the second level is a second period of time, and a combination of the sets of the first period of time and the second period of time is predetermined and stored in a register of the display driving chip. The display driving chip is also used for responding to a selection request of a user and selecting a corresponding set of setting combinations from the plurality of sets of setting combinations.

At this time, the user may select a setting menu of the electronic device according to a desired display effect, for example, when the user desires to extend the endurance time of the electronic device, a setting combination with a low high-order time ratio and a high low-order time ratio may be selected, and when the user desires to improve the display picture quality of the electronic device without paying attention to the power consumption of the electronic device, a setting combination with a high-order time ratio and a low-order time ratio may be selected, and the display driver chip selects a corresponding setting combination in response to a selection request of the user.

In one possible implementation, the duration of the partial refresh reset signal at the first level is a first period, the period of the partial refresh reset signal at the second level is a second period, multiple sets of setting combinations of the first period and the second period are predetermined and stored in a register of the display driving chip, and the basic frame rate of the screen is adjustable. The display driving chip is also used for determining a corresponding set of setting combinations from the plurality of sets of setting combinations according to the current basic frame rate of the screen. For example, the lower time duty cycle is now positively correlated with the base frame rate of the screen, i.e., the higher the refresh rate of the screen, the higher the time duty cycle for partial refresh is employed to further reduce power consumption.

In one possible implementation manner, the display driving chip is specifically configured to make the output second enable signal be at the second level when at least one of the local refresh reset signal and the local refresh data enable signal is at the second level, and make the output second enable signal be at the first level otherwise.

In one possible implementation, the display driver chip includes a mobile industry processor interface. The mobile industry processor interface decodes the control command sent by the application processor to obtain the pixel needing refreshing; the control command carries the coordinates of the pixels to be refreshed.

In one possible implementation, the first level is a low level and the second level is a high level.

In a second aspect, the present application also provides a screen refreshing method, including the steps of:

according to the pixels to be refreshed, a first enabling signal is sent to the row driving circuit, a second enabling signal is sent to the column driving circuit, so that when the first enabling signal and the second enabling signal are pulse signals, the screen performs local refreshing under the driving of the row driving circuit and the column driving circuit, when the first enabling signal is a first level and the second enabling signal is a second level, the screen performs global refreshing under the driving of the row driving circuit and the column driving circuit, and the row driving circuit is used for generating row driving signals for driving pixel rows of the screen; and the column driving circuit is used for inputting the data signals output by the display driving chip into the pixel circuit and refreshing the display content of the screen.

The method provided by the application enables the screen driving circuit to have the functions of global refreshing and local refreshing. When the display driving chip realizes the function of local refreshing, only partial pixels with updated contents on the screen are refreshed, namely the local refreshing of the screen is realized, and the rest partial pixels without updated contents on the screen can keep original display without refreshing, so that the power consumption can be reduced, and the delay of the refreshing of the screen is reduced.

In one possible implementation, the sending of the first enable signal to the row driving circuit specifically includes:

when at least one of the local refresh reset signal and the local refresh enable signal is at a second level, the output first enable signal is at a first level, otherwise, the output first enable signal is at a second level; the ratio of the basic frame rate of the screen to the frequency of the local refreshing reset signal is a positive integer, and the basic frame rate is the display frame rate currently adopted by the screen.

In one possible implementation, the duration of the partial refresh reset signal at the first level is a first period, the period of the partial refresh reset signal at the second level is a second period, and a plurality of sets of setting combinations of the first period and the second period are predetermined and stored in a register of the display driving chip; the method further comprises the steps of:

in response to a user selection request, a corresponding one of the plurality of sets of set combinations is determined.

In one possible implementation manner, the duration of the local refresh reset signal at the first level is a first time period, the time period of the local refresh reset signal at the second level is a second time period, multiple groups of setting combinations of the first time period and the second time period are predetermined and stored in a register of the display driving chip, and the basic frame rate of the screen is adjustable; the method further comprises the steps of:

And determining a corresponding set of setting combinations from the plurality of sets of setting combinations according to the current basic frame rate of the screen.

In one possible implementation, the nematic driving circuit sends the second enable signal, specifically including:

and when at least one of the local refresh reset signal and the local refresh data enable signal is at a second level, enabling the output second enable signal to be at the second level, otherwise enabling the output second enable signal to be at the first level.

In practical applications, the low-order time duty ratio is positively correlated with the basic frame rate of the screen, that is, the higher the refresh rate of the screen is, the higher the time duty ratio of local refresh is adopted, so as to further reduce the power consumption.

In one possible implementation, before sending the first enable signal to the row driver circuit and the second enable signal to the column driver circuit, according to the pixels to be refreshed, the method further includes:

and acquiring the pixels to be refreshed according to a control command sent by the application processor, wherein the control command carries the coordinates of the pixels to be refreshed.

In a third aspect, the present application also provides an electronic device, including the screen driving circuit provided in the above implementation manner, and further including a screen. The screen comprises a pixel array and a pixel driving circuit; the pixel array is a display area of the screen; the output end of the screen driving circuit is connected with the input end of the pixel driving circuit; and the pixel driving circuit is used for driving the pixel array to refresh display contents.

The screen driving circuit of the electronic equipment has the functions of global refreshing and local refreshing. When the display driving chip realizes the function of local refreshing, only partial pixels with updated contents on the screen are refreshed, namely, the local refreshing of the screen is realized, and other partial pixels without updated contents on the screen can continue to keep original display without refreshing, so that the power consumption can be reduced, the endurance time of the electronic equipment is improved, and the delay of screen refreshing is reduced. The electronic device may be a cell phone, a notebook computer, a wearable electronic device (e.g., a smart watch), a tablet computer, an augmented reality (augmented reality, AR) device, a Virtual Reality (VR) device, an in-vehicle device, or the like.

In one possible implementation, the screen of the electronic device is an active matrix organic light emitting diode or Active Matrix Organic Light Emitting Diode (AMOLED) screen, a liquid crystal display (liquid crystal display, LCD), or an organic light-emitting diode (OLED) screen.

Drawings

FIG. 1 is a schematic diagram of an electronic device;

FIG. 2 is a schematic diagram of an AMOLED display;

FIG. 3 is a schematic diagram of a peripheral driving circuit;

FIG. 4 is a schematic diagram of a conventional row driving process;

FIG. 5 is a schematic diagram of a screen driving circuit according to an embodiment of the present application;

FIG. 6 is a schematic diagram of a display driving chip according to an embodiment of the present application;

FIG. 7 is a schematic diagram of a line driving process of a screen according to an embodiment of the present application;

FIG. 8 is a timing chart of driving control according to an embodiment of the present application;

FIG. 9 is a schematic diagram of a NOR gate output GOA enable signal according to an embodiment of the present application;

FIG. 10 is a schematic diagram of an OR gate output O_ENB according to an embodiment of the present application;

FIG. 11 is a schematic diagram of a driving architecture of a display driving chip according to an embodiment of the present application;

FIG. 12 is a timing chart II of driving control according to an embodiment of the present application;

fig. 13 is a schematic diagram of a screen refreshing method according to an embodiment of the present application;

FIG. 14 is a schematic diagram of another screen refreshing method according to an embodiment of the present application;

fig. 15 is a schematic diagram of an electronic device according to an embodiment of the present application.

Detailed Description

In order to make the technical personnel in the technical field more clearly understand the scheme of the application, the application scenario of the technical scheme of the application is first described below.

The technical scheme provided by the embodiment of the application is used for enabling the screen of the electronic equipment to have a local refreshing function. The electronic device may be a mobile phone, a notebook computer, a wearable electronic device (e.g., a smart watch), a tablet computer, an augmented reality AR device, a virtual reality VR device, a vehicle-mounted device, or the like.

Referring to fig. 1, a schematic structure of an electronic device is shown.

The electronic device 100 may include a processor 110, an external memory interface 120, an internal memory 121, a universal serial bus (universal serial bus, USB) interface 130, a charge management module 140, a power management module 141, a battery 142, an antenna 1, an antenna 2, a mobile communication module 150, a wireless communication module 160, an audio module 170, a speaker 170A, a receiver 170B, a microphone 170C, an earphone interface 170D, a sensor module 180, keys 190, a motor 191, an indicator 192, a camera 193, a display 194, and a subscriber identity module (subscriber identification module, SIM) card interface 195, etc. The sensor module 180 may include a pressure sensor 180A, a gyro sensor 180B, an air pressure sensor 180C, a magnetic sensor 180D, an acceleration sensor 180E, a distance sensor 180F, a proximity sensor 180G, a fingerprint sensor 180H, a temperature sensor 180J, a touch sensor 180K, an ambient light sensor 180L, a bone conduction sensor 180M, and the like.

It should be understood that the illustrated structure of the embodiment of the present application does not constitute a specific limitation on the electronic device 100. In other embodiments of the application, electronic device 100 may include more or fewer components than shown, or certain components may be combined, or certain components may be split, or different arrangements of components. The illustrated components may be implemented in hardware, software, or a combination of software and hardware.

The processor 110 may include one or more processing units, such as: the processor 110 may include an application processor (application processor, AP), a modem processor, a graphics processor (graphics processing unit, GPU), an image signal processor (image signal processor, ISP), a controller, a video codec, a digital signal processor (digital signal processor, DSP), a baseband processor, and/or a neural network processor (neural-network processing unit, NPU), etc. Wherein the different processing units may be separate devices or may be integrated in one or more processors.

The controller can generate operation control signals according to the instruction operation codes and the time sequence signals to finish the control of instruction fetching and instruction execution.

The electronic device 100 implements display functions through a GPU, a display screen 194, an application processor, and the like. The GPU is a microprocessor for image processing, and is connected to the display 194 and the application processor. The GPU is used to perform mathematical and geometric calculations for graphics rendering. Processor 110 may include one or more GPUs that execute program instructions to generate or change display information.

The display screen 194 is used to display images, videos, and the like. The display 194 includes a display panel. The display panel may employ a liquid crystal display (liquid crystal display, LCD), an organic light-emitting diode (OLED), an AMOLED, a flexible light-emitting diode (FLED), a Mini-LED, a Micro-OLED, a quantum dot light-emitting diode (quantum dot light emitting diodes, QLED), or the like. In some embodiments, the electronic device 100 may include 1 or N display screens 194, N being a positive integer greater than 1.

The internal memory 121 may be used to store computer executable program code including instructions. The internal memory 121 may include a storage program area and a storage data area. The storage program area may store an application program (such as a sound playing function, an image playing function, etc.) required for at least one function of the operating system, etc. The storage data area may store data created during use of the electronic device 100 (e.g., audio data, phonebook, etc.), and so on. In addition, the internal memory 121 may include a high-speed random access memory, and may further include a nonvolatile memory such as at least one magnetic disk storage device, a flash memory device, a universal flash memory (universal flash storage, UFS), and the like. The processor 110 performs various functional applications of the electronic device 100 and data processing by executing instructions stored in the internal memory 121 and/or instructions stored in a memory provided in the processor.

The following description will take a screen, i.e., a display panel of the display screen 194 as an AMOLED as an example.

Referring to fig. 2, a schematic structure of an AMOLED display screen is shown.

The AMOLED display 20 mainly includes a pixel array 21, a pixel driving circuit 22 located below the pixel array 21, a peripheral driving circuit 23 located at the same layer as the pixel driving circuit 22, and a support back plate 24 below the peripheral driving circuit 23.

The pixel array 21 is an effective display area of the AMOLED display screen 20 for displaying contents.

For example, one typical distribution of pixel array 21 is an array of 1920×1080 pixels. Each pixel in the pixel array includes an R (red) G (green) B (blue) light emitting diode, i.e., an rgbmoled.

The pixel driving circuit 22 and the peripheral driving circuit 23 may also be referred to as Active Matrix (Active Matrix), and the AMOLED display screen mixes colors by driving rgbmoled with a display driving chip (Display Driver Integrated Circuit, DDIC) and Active Matrix, and converts the image display content into an optical signal of the display screen.

Referring to fig. 3, a schematic diagram of a peripheral driving circuit is shown.

The peripheral drive circuit (or referred to as an array drive circuit) includes a row drive circuit 31 and a column drive circuit 32.

The row driving circuit 31 receives a serial bus clock signal output from the DDIC, and writes the serial bus clock signal to each pixel circuit 33 in the DDIC clock order.

The function of the row driver circuit 31 is to convert the serial clock of the DDIC into sequential write pulses with driving capability, which is essentially a linear controller. A disadvantage of the linear controller is that the direction is single, i.e. either from the first line to the nth line or from the last line (endLine) to the first line (firstLine).

The column driving circuit 32 inputs a Data (Data) signal extracted from the DDIC directly or via a time shifter (MUX) to the pixel circuit 33.

The data signals are linearly written into the pixel circuits under the drive of the row driving signals, so that the content of the whole screen is updated.

Referring to fig. 4, a schematic diagram of a conventional row driving process is shown.

The current mainstream OLED driving mode is that the data signal is written linearly under the driving of the line scanning signal, and the whole screen content is refreshed. As shown in fig. 4, it is assumed that the screen includes 12×10 pixels, i.e., 12 rows and 10 columns of pixels. The content to be displayed is in a center-shaped (16 pixels in total), and according to the current progressive scanning driving mode, the refreshing area is 100%, namely, the pixels of the whole screen are refreshed, so that the problems of high power consumption and high time delay exist.

As another example, as the screen area of current electronic devices increases, in a typical application scenario, the screen may be divided into two or more display windows, such as a chat window and a video play window. For a chat window, this window theoretically does not need to be refreshed when the content is unchanged. For a video playing window, the content change rate of the window is higher, and the refresh rate required for the region is higher. Therefore, in such an application scenario, the refresh rate of the whole screen needs to be set to meet the requirement of the window with the highest requirement, that is, the refresh rate requirement of the video playing window, 120Hz or 60Hz, so that the display window which does not need to have a high refresh rate also needs to have a high refresh rate, thus also resulting in high power consumption and high delay.

High power consumption can reduce the endurance of the electronic device. The high delay may cause poor display effect, and may not satisfy feedback delay of input/output (I/O) devices such as an active pen, thereby reducing user experience.

In order to solve the problems, the application provides a screen driving circuit, a screen refreshing method and electronic equipment, which can enable a driving display chip to drive only a part with updated content, namely, local refreshing of a screen is realized, and the rest part without updated content on the screen can keep original display continuously, so that the power consumption of a driving module can be reduced, and the delay of screen refreshing is reduced. The following is a detailed description of various embodiments.

The terms first, second, third and the like in the description and in the claims and in the drawings are used for distinguishing between different objects and not for limiting the specified order.

Furthermore, in the present application, directional terms "upper", "lower", etc. may be defined as including, but not limited to, the orientation in which the components are schematically disposed with respect to each other in the drawings, and it should be understood that these directional terms may be relative concepts, which are used for the description and clarity with respect thereto, and which may be correspondingly varied depending upon the orientation in which the components are disposed with respect to the drawings in the drawings.

In embodiments of the application, words such as "exemplary" or "such as" are used to mean serving as an example, instance, or illustration. Any embodiment or design described herein as "exemplary" or "e.g." in an embodiment should not be taken as preferred or advantageous over other embodiments or designs. Rather, the use of words such as "exemplary" or "such as" is intended to present related concepts in a concrete fashion.

In the present application, unless explicitly specified and limited otherwise, the term "connected" is to be construed broadly, and for example, "connected" may be either fixedly connected, detachably connected, or integrally formed; can be directly connected or indirectly connected through an intermediate medium.

The embodiment of the application provides an electronic device, and the electronic device is specifically described below with reference to the accompanying drawings.

Referring to fig. 5, a schematic diagram of a screen driving circuit according to an embodiment of the present application is shown.

The screen driving circuit provided by the embodiment of the application comprises: a display driving chip 51, a row driving circuit 31, a column driving circuit 32, and a pixel circuit 33.

Wherein the row driving circuit 31 is for generating row driving signals for driving the pixel rows of the screen.

The column driving circuit 32 is used to input the data signals output from the display driving chip to the pixel circuits.

The pixel circuit 33 is used to refresh the display content of the screen.

The display driving chip 51 is used for sending a first enabling signal to the row driving circuit and sending a second enabling signal to the column driving circuit according to the pixel refreshed as required.

When the first enabling signal and the second enabling signal sent by the display driving chip 51 are pulse signals, the screen is subjected to local refreshing under the driving of the row driving circuit and the column driving circuit; when the first enable signal sent by the display driving chip 51 is at the first level and the second enable signal is at the second level, the screen performs global refresh under the driving of the row driving circuit and the column driving circuit.

In the following description of the embodiments of the present application, the first level is a low level, the second level is a high level, and when the first level is a high level, the implementation manner of the second level is similar, and the embodiments of the present application are not repeated.

The implementation of the display driver chip is first described below.

Referring to fig. 6, a schematic diagram of a display driving chip according to an embodiment of the application is shown.

The display driving chip 51, that is, DDIC, specifically includes a logic board 511 and MIPI Rx512.

The logic board 511 is also called a screen driving board, a center control board, or a TCON board, among others.

The logic board 511 processes an image data input signal (the image input signal may include three signals, such as an RGB data signal, a clock signal, and a control signal) sent from the digital board, converts the processed image data input signal into a signal capable of driving a screen, and outputs the signal.

The display driver chip 51 includes a mobile industry processor interface (Mobile Industry Processor Interface Receiver, MIPI Rx) that aims to standardize interfaces inside the electronic device, such as a display screen interface, etc., thereby reducing complexity of the design of the electronic device and increasing design flexibility.

The display driving chip 51 can switch between the global refresh mode and the local refresh mode when performing timing control. The global refresh mode is a refresh mode adopted in the prior art, namely, the pixels of the whole screen are refreshed. The partial refresh mode is to refresh only the updated content, and to keep the original display for the part without updating, namely to refresh part of pixels of the screen.

The MIPI Rx512 side of the display driver chip 51 decodes the control command of the front-end application processor (application processor, AP) 61 to determine whether the global refresh mode or the local refresh mode is currently required.

If the display driver chip 51 determines that the global refresh mode is currently required, the global refresh is performed according to the conventional refresh mode, which is not described in detail again in the embodiment of the present application.

If the display driving chip 51 determines that it is currently required to be in the partial refresh mode, driving is performed in accordance with timing control of partial refresh, which will be described in detail below.

The output end of the display driving chip 51 is connected to a control board 62, and the control board 62 includes a plurality of Array substrate row driving circuits (GOAs) and source timing control (source timing control) circuits.

The GOA integrates the gate switch circuit on the array substrate, so that the high integration of the driving circuit is realized, and the cost is reduced from the aspects of saving materials and reducing process steps.

The GOA circuit is a row driving circuit for a row of pixels in the pixel array. Since the pixel array of the screen includes a plurality of rows of pixels in practical use, the output terminals of the display driving chip 51 need to be connected to a plurality of GOA circuits. As shown in fig. 7, which is a schematic diagram of a line driving process of a screen provided by the present application, an output terminal of the driving chip 51 is connected to 12 GOA circuits.

Referring to fig. 8, a timing chart of driving control provided by an embodiment of the present application is shown.

At this time, the display driving chip 51 needs to increase the following driving control in order to realize the partial refresh mode:

base_sub_vsync, which refers to a partial refresh reset reference signal, may be set. The frequency of the partial refresh reset reference signal is obtained by dividing a base frame rate (base frame rate) by a preset positive integer. The Frame rate (Frame rate) is a frequency at which bitmap images in units of frames appear continuously on a screen. The frame rate may also be referred to as the frame frequency and is expressed in hertz (Hz). Base Vsync in the figure represents a Base frame rate synchronization signal. The basic frame rate of the screen is the display frame rate adopted when the screen currently displays the content.

Taking the basic frame rate of 120Hz as an example, that is, 120 screen refreshes in 1 second, each refresh interval is 8.3 milliseconds (ms), the frequency of the local refresh reset reference signal is 1/12 of the basic frame rate. The local refresh reset reference signal resets all pixels once every 100ms, and then resumes local refresh in a new period, thereby improving the display effect problem of each pixel on the screen due to different refresh rates.

It can be understood that the above 1/12 ratio of the frequency of the local refresh reset reference signal to the base frame rate is only illustrative, and does not constitute a limitation to the technical solution of the present application, in practical application, the ratio of the frequency of the local refresh reset reference signal to the base frame rate may be other values, such as 1/10, 1/15, etc., and the embodiments of the present application will not be repeated.

Partial _ scan _ enb refers to a local refresh enable signal for enabling local refresh. The duration of each recessed pulse of the local refresh enable signal is the time it takes to scan a Y row of pixels.

Partial_rst refers to the local refresh reset signal. Taking into account the characteristics of the Discrete-time fourier transform (DTFT), the pixels that are not refreshed are reset and the entire data is refreshed again. The high potential (hereinafter denoted by H) and the low potential (hereinafter denoted by L) of the partial_rst are set on the basis of base_sub_vsync, that is, the period of partial_rst is also 100ms at this time. The frequency of the local refresh reset reference signal, i.e. the frequency of the local refresh reset signal, is thus high.

Taking the refresh rate of the screen as 120Hz as an example, when partial refresh is performed, the frame rate of Y rows of pixels needing data refresh is 120Hz, and the rest rows needing no refresh are maintained as they are, so that the number and times of data refresh are reduced, and further the power consumption can be reduced. However, the refresh rate of the pixels is different, so that the device characteristics of the circuit devices corresponding to the pixels are different, that is, the drift of the device characteristics exists, and the inaccuracy problem exists in the image displayed on the screen. Therefore, by setting the partial_rst, all pixels on the screen are refreshed uniformly, and the drift of the characteristics of each device is reduced or eliminated.

In fig. 8, partial_act_y is a row local refresh operation signal, and each black pulse in partial_act_y indicates that Y rows of pixels are refreshed once, assuming that Y rows are shared by pixels that need to be locally refreshed. I.e. the Y rows of pixels are now locally refreshed every 8.3 ms.

Base_sub_vsync, partial_scan_enb, and partial_rst are internal logic controls of the display driving chip 51, and may not be output to the control board 62.

Referring to fig. 9, a schematic diagram of a nor gate output GOA enable signal according to an embodiment of the present application is shown.

The partial_goa_enb refers to a GOA local refresh enable signal, that is, a first enable signal, which is a signal that is output from the display driver chip 51 to the control board 62 and is used to instruct the respective GOA circuits to perform local refresh. The signal is the NOR gate (NOR gate) output of partial_rst and partial_scan_enb. The nor gate circuit may be implemented by components included in the display driving chip 51, and the implementation manner of the nor gate circuit is a mature technology, which is not described herein in detail.

For a screen of an electronic device, the Y direction is the extending direction of the column and the X direction is the extending direction of the row.

When the partial_rst is pulled down to L, the partial_scan_enb is L, and the partial_GOA_enb is H; when the partial_scan_enb is H, the partial_goa_enb is L, that is, the partial_goa_enb is locally refreshed at this time, and the partial_goa_enb is pulled down to L at the Y-row pixels to be locally refreshed, and the scanning of the Y-row pixels is turned on in cooperation with each GOA circuit of the control board 62.

When the partial_rst is pulled up to H, no matter whether the partial_scan_enb is L or H, the partial_GOA_enb outputs high potential H in all areas in the Y direction, namely global refreshing is performed at the moment, so that all scans on a screen can be opened in sequence, and each row can perform data refreshing, thereby reducing or eliminating drift of characteristics of each device.

The realization mode controls the local refreshing and the global refreshing to be alternately carried out, and the time-sharing control can reduce the power consumption, reduce or eliminate the drift of the characteristics of each device and ensure the quality of the displayed picture.

The row control section corresponding to GOA is described above, and the column control section corresponding to data is described below.

The driving architecture modification design of the display driving chip 51 requires adding an enable bit (enable bit) control to a final source (source) control board (OP), which is implemented by a source channel OP enable bit (Source channel OP enable bit, abbreviated as o_enb), and also enables a second enable signal, which will be described in detail below.

Referring to fig. 10, a schematic diagram of an or gate output o_enb according to an embodiment of the present application is shown.

O_ENB is the OR gate output of partial_rst (Partial refresh reset signal) and Partial scan_enb (Partial scan enable signal).

See also fig. 11-12. Fig. 11 is a schematic diagram of a driving architecture of a display driving chip according to an embodiment of the present application; fig. 12 is a timing chart of driving control according to an embodiment of the present application.

In terms of the data architecture of the entire display driving chip 51, where h_clk, h_sync, and partial_rst are signals outputted from the display driving chip 51 when timing control (timing control) is performed.

H_clk is a pixel clock signal, and h_sync is a row synchronization signal.

The process of data controlling the output control voltage is specifically described below.

The shift register (S/R) causes the first latch (latch) to latch video data (video data) by clock shifting. Each latch1 in FIG. 11 characterizes one of the first latches.

When the first latch stores, the second latch is enabled, and each latch2 in FIG. 11 is one of the second latches. The existing display driver chip 51 has added an enable bit (enable bit) for each latch of the second latch. The enable bit is used to implement framing of the active (active) regions of the screen, e.g., 1080 active regions of the screen, then 1080 latches would be enabled to frame 1080 pixels.

Then level shift (L/S) is performed, and digital-to-analog conversion (DAC) is performed after level shift.

When performing DAC, a gamma voltage (gamma voltage) is connected as a reference voltage, and a control voltage is outputted to the analog region.

The entire analog region includes many stages of OPs, only the scene at one stage of OPs is illustrated in fig. 11. When the analog region comprises a stage OP, an enable bit control is added on the stage OP; when the analog region includes multiple stages of OPs, an enable bit control is added to the OP of the last stage.

Taking fig. 7 as an example, the heart pattern of the screen refresh involves columns 2 to 9. Then the channel OPs corresponding to columns 2 through 9 need to be enabled at this time. The remaining columns 1 and 10 do not need to be refreshed, so that the channels OP corresponding to the columns 1 and 10 do not need to be enabled.

Within the analog region, whether the mode in which the refresh is performed is global or local can be selected, with different refresh modes, different OPs being enabled.

With continued reference to fig. 7, the scheme of the embodiment of the present application operates in a row selection unit, that is, after determining that the 3 rd to 8 th rows need to be refreshed, the display contents are refreshed by the pixel circuits of the connected row being determined whether to be output or not using CLK 2. Specifically, if CLK2 is valid, the write driving signal output from the GOA circuit is output to a row of pixel driving circuits connected at a later stage, that is, the write driving signal is provided for the row of pixel circuits. If CLK2 is inactive, the write drive signal at the output of the GOA circuit is masked, i.e., the display content of the row of pixel circuits is kept unchanged, and CLK2 is also the pixel clock signal H_clk.

With the or gate shown in fig. 10, whether the local OP or the global OP is currently enabled is determined, and the implementation of the or gate circuit is a more mature technology, which is not described herein in detail.

Referring to fig. 12, base_vsync represents a base frame rate synchronization signal, and continues to refresh the screen 120 times in 1 second, taking a base frame rate of 120Hz as an example.

Hsync is a line synchronization signal corresponding to h_sync in fig. 11 for determining a start timing of scanning each line of pixels. The frequency of the line synchronization signal in fig. 11 is only for convenience of description, and does not limit the technical solution of the present application, but may be set to other frequencies in practical application, and will not be described again.

The partial_data_enb refers to a Partial refresh data enable signal, and is determined by the X-direction update area of the Partial refresh update data, but is also controlled by the partial_rst signal.

The display driving chip 51 is specifically configured to output a second enable signal at a second level when at least one of the local refresh reset signal and the local refresh data enable signal is at the second level, and output the second enable signal at the first level otherwise.

Specifically, when the partial_rst is pulled down to L and the partial_data_enb is pulled up to H, the o_enb is H, so that the Source OP operation of the update area is performed, and the required Source data voltage is pushed out.

When partial_rst pulls up H, since O_ENB is the output of OR gate, O_ENB is continuously H, all source OPs are enabled, and all source OPs are enabled to push out source data voltage.

In fig. 12, partial_act_x is a column local refresh operation signal, and if there are X columns in total of pixels that need to be locally refreshed, each black pulse in the partial_act_column indicates that X columns of pixels are refreshed once.

The above high/low settings are for illustrating control purposes, and the actual circuit design will be different high/low designs according to the characteristics of the circuit device, and the embodiments of the present application are not described herein.

Before operation, the display driver chip 51 needs to set the registers as follows:

1. setting the base_sub_vsync, that is, setting the local refresh reset reference signal, may be obtained by dividing a positive integer by a whole according to a basic frame rate supported by the electronic device.

2. The high/low time setting of partial_rst is performed, and the alternating time of local refresh and global refresh is determined by the actual display effect.

In one possible implementation, the high/low time setting for partial_rst may be predetermined and stored in a register, so that the display driver chip 51 may be invoked directly when in use. At this time, the duration of the local refresh reset signal at the first level is a first period, the period of the local refresh reset signal at the second level is a second period, and the first period and the second period are fixed. I.e. the duty cycle of the partial refresh reset signal is fixed.

In another possible implementation manner, multiple sets of high-level/low-level time settings are stored in a register in advance, a user can select in a setting menu of the electronic device according to a desired display effect, for example, when the user wants to prolong the endurance time of the electronic device, a setting combination with a low high-level time ratio and a high-level time ratio can be selected to prolong the local refresh time ratio, when the user wants to improve the display picture quality of the electronic device without paying attention to the power consumption of the electronic device, a setting combination with a high-level time ratio and a low-level time ratio can be selected, and the display driving chip responds to a selection request of the user to select a corresponding setting combination.

In yet another possible implementation, the refresh rate of the screen of the electronic device may be adjusted automatically or manually by the user, where the low-level time duty cycle is positively correlated with the base frame rate of the screen, i.e., the higher the refresh rate of the screen, the higher the time duty cycle of the local refresh is employed to further reduce power consumption.

In summary, with the electronic device provided by the embodiment of the present application, when the MIPI Rx512 end of the display driver chip 51 decodes the control command of the application processor 61 at the front end, the pixel coordinates of (x 1, y 1), (x 2, y 2), …, (xn, yn) and the like are obtained to determine the pixel that needs to be refreshed, the local refresh is achieved, that is, the display content of the area with updated content is refreshed, the display content of the image holding area is not refreshed, so that the local refresh based on the display content is achieved, and the purposes of reducing the power consumption and reducing the screen refresh delay are achieved.

In some embodiments, the display screen of the electronic device is an AMOLED display screen, and the structure of the AMOLED display screen is shown in fig. 2, which is not described herein. By utilizing the scheme, the electronic equipment can realize the local refreshing function of the screen, and in one possible application scene, the display screen of the electronic equipment can be divided into different working partitions, each working partition refreshes display contents by adopting different refreshing rates, or partial working partitions are refreshed locally, and the working partitions such as chat windows or static backgrounds can be kept in an original state without refreshing. The refresh rate may be 60Hz, 90Hz, or even 120Hz or higher, as embodiments of the application are not particularly limited.

Based on the electronic device provided in the above embodiment, the embodiment of the present application further provides a screen refreshing method, which is specifically described below with reference to the accompanying drawings.

Referring to fig. 13, a schematic diagram of a screen refreshing method according to an embodiment of the present application is shown.

The method is applied to the screen driving circuit, and the specific implementation and working principle of the screen driving circuit can be referred to the description in the above embodiments, which are not repeated here. The method comprises the following steps:

S101: pixels that need to be refreshed are determined.

In one possible implementation, the pixels to be refreshed are determined according to a control command sent by the application processor, where the control command carries coordinates of the pixels to be refreshed.

S102: according to the pixels needing to be refreshed, a first enabling signal is sent to the row driving circuit, and a second enabling signal is sent to the column driving circuit, so that when the first enabling signal and the second enabling signal are pulse signals, the screen performs local refreshing under the driving of the row driving circuit and the column driving circuit, and when the first enabling signal is at a first level and the second enabling signal is at a second level, the screen performs global refreshing under the driving of the row driving circuit and the column driving circuit.

The first enable signal is the partial_goa_enb in the above embodiment; the second enable signal is the source channel OP enable bit in the above embodiment, i.e., o_enb.

The row driving circuit is used for generating row driving signals for driving pixel rows of the screen. The column driving circuit is used for inputting the data signals output by the display driving chip into the pixel circuit. The pixel circuit is used for refreshing the display content of the screen.

The following description is directed to specific implementation methods. In the following description, the first level is a low level, the second level is a high level, and when the first level is a high level, the implementation manner of the second level is similar, and the embodiments of the present application are not repeated.

Referring to fig. 14, a schematic diagram of another screen refreshing method according to an embodiment of the present application is shown.

S201: and determining pixels needing refreshing according to the control command sent by the application processor.

S202: the frequency of the local refresh reset signal is determined according to the base frame rate of the screen.

The ratio of the basic frame rate of the screen to the frequency of the local refresh reset signal is a positive integer, and the basic frame rate is the display frame rate currently adopted by the screen.

S203: when at least one of the local refresh reset signal and the local refresh enable signal is at a second level, the output first enable signal is at a first level, otherwise, the output first enable signal is at a second level.

In another possible implementation, the duration of the partial refresh reset signal at the first level is a first period, the period of the partial refresh reset signal at the second level is a second period, and a combination of the sets of the first period and the second period is predetermined and stored in a register of the display driving chip. At this time, the method further comprises the steps of:

In yet another possible implementation, the combination of the sets of settings for the first time period and the second time period is predetermined and stored in a register of the display driver chip, and the base frame rate of the screen is adjustable, for example, automatically or manually by a user. The method at this time further comprises the steps of:

and determining a corresponding set of setting combinations from the plurality of sets of setting combinations according to the current basic frame rate of the screen. In practical applications, the low-order time duty cycle may be configured to be positively correlated with the base frame rate of the screen, i.e., the higher the refresh rate of the screen, the higher the time duty cycle of local refresh is employed to further reduce power consumption.

S204: and when at least one of the local refresh reset signal and the local refresh data enable signal is at a second level, enabling the output second enable signal to be at the second level, otherwise enabling the output second enable signal to be at the first level.

The above steps of the embodiments of the present application are merely for convenience of description, and do not constitute limitation of the technical solution of the present application.

By using the method provided by the embodiment of the application, the screen driving circuit has the functions of global refreshing and local refreshing. When the display driving chip realizes the function of local refreshing, only partial pixels with updated contents on the screen are refreshed, namely the local refreshing of the screen is realized, and the rest partial pixels without updated contents on the screen can keep original display without refreshing, so that the power consumption can be reduced, and the delay of the refreshing of the screen is reduced.

Based on the screen driving circuit provided by the embodiment, the embodiment of the application also provides an electronic device, and the electronic device is specifically described below with reference to the accompanying drawings.

Referring to fig. 15, a schematic diagram of an electronic device according to an embodiment of the present application is shown.

The electronic device 100 includes a screen driving circuit 101 and a screen 102.

The screen 102 is used for displaying images, videos, etc., and the screen 102 may be an AMOLED screen, an LCD screen, an OLED screen, etc., which is not limited in the present application.

In some embodiments, the electronic device 100 may include multiple screens 102, where the multiple screens 102 may be the same type of screen or different types of screens, and embodiments of the present application are not limited in this regard.

The screen 102 specifically includes a pixel array 21 and a pixel driving circuit 22. The pixel array 21 is a display area of the screen 102, and an output end of the screen driving circuit 22 is connected to an input end of the pixel driving circuit 22. The pixel driving circuit 22 refreshes the display content by driving the pixel array 21.

The screen driving circuit 101 includes a pixel circuit, a display driving chip, a row driving circuit and a column driving circuit, and for the specific implementation of the screen driving circuit 101, reference may be made to the related description in the above embodiments, and the description of the embodiments of the present application is omitted here again.

In summary, the screen driving circuit of the electronic device has the functions of global refresh and local refresh. When the display driving chip realizes the function of local refreshing, only partial pixels with updated contents on the screen are refreshed, namely, the local refreshing of the screen is realized, and other partial pixels without updated contents on the screen can continue to keep original display without refreshing, so that the power consumption can be reduced, the endurance time of the electronic equipment is improved, and the delay of screen refreshing is reduced. The electronic device may be a cell phone, a notebook computer, a wearable electronic device (e.g., a smart watch), a tablet computer, an AR device, a VR device, a vehicle-mounted device, and the like.

In the several embodiments provided in this embodiment, it should be understood that the disclosed system, apparatus and method may be implemented in other manners. For example, the apparatus embodiments described above are merely illustrative, e.g., the division of the modules or units is merely a logical functional division, and there may be additional divisions when actually implemented, e.g., multiple units or components may be combined or integrated into another system, or some features may be omitted, or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be an indirect coupling or communication connection via some interfaces, devices or units, which may be in electrical, mechanical or other form.

The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

In addition, each functional unit in each embodiment of the present embodiment may be integrated in one processing unit, each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in software functional units.

The integrated units, if implemented in the form of software functional units and sold or used as stand-alone products, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present embodiment may be essentially or a part contributing to the prior art or all or part of the technical solution may be embodied in the form of a software product stored in a storage medium, including several instructions to cause a computer device (which may be a personal computer, a server, or a network device, etc.) or a processor to perform all or part of the steps of the method described in the respective embodiments. And the aforementioned storage medium includes: flash memory, removable hard disk, read-only memory, random access memory, magnetic or optical disk, and the like.

The foregoing is merely illustrative of specific embodiments of the present application, and the scope of the present application is not limited thereto, but any changes or substitutions within the technical scope of the present application should be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A screen driving circuit, characterized in that the screen driving circuit comprises: a pixel circuit, a display driving chip, a row driving circuit and a column driving circuit; wherein,

the line driving circuit is used for generating line driving signals for driving pixel lines of a screen;

the column driving circuit is used for inputting the data signals output by the display driving chip into the pixel circuit;

the pixel circuit is used for refreshing the display content of the screen;

the display driving chip is used for sending a first enabling signal to the row driving circuit and sending a second enabling signal to the column driving circuit according to pixels needing to be refreshed, so that when the first enabling signal and the second enabling signal are pulse signals, the screen is subjected to local refreshing under the driving of the row driving circuit and the column driving circuit, and when the first enabling signal is a first level and the second enabling signal is a second level, the screen is subjected to global refreshing under the driving of the row driving circuit and the column driving circuit.

2. The screen driving circuit according to claim 1, wherein the display driving chip is specifically configured to make the output first enable signal be a first level when at least one of the local refresh reset signal and the local refresh enable signal is a second level, and make the output first enable signal be a second level otherwise; the ratio of the basic frame rate of the screen to the frequency of the local refreshing reset signal is a positive integer, and the basic frame rate is the display frame rate currently adopted by the screen.

3. The screen drive circuit of claim 2, wherein a duration of the partial refresh reset signal at the first level is a first period of time, a period of time the partial refresh reset signal is at the second level is a second period of time, and the first period of time and the second period of time are fixed.

4. The screen driving circuit according to claim 2, wherein a duration of the partial refresh reset signal being at a first level is a first period of time, a period of time of the partial refresh reset signal being at a second level is a second period of time, and a plurality of sets of setting combinations of the first period of time and the second period of time are predetermined and stored in a register of the display driving chip;

The display driving chip is further used for responding to a selection request of a user and selecting a corresponding set of setting combinations from the multiple sets of setting combinations.

5. The screen driving circuit according to claim 2, wherein a duration of the partial refresh reset signal at a first level is a first period of time, a period of time of the partial refresh reset signal at a second level is a second period of time, a plurality of sets of setting combinations of the first period of time and the second period of time are predetermined and stored in a register of the display driving chip, and a basic frame rate of the screen is adjustable;

the display driving chip is further used for determining a corresponding set of setting combinations from the multiple sets of setting combinations according to the current basic frame rate of the screen.

6. The screen driving circuit according to any one of claims 2 to 5, wherein the display driving chip is specifically configured to make the output second enable signal be at the second level when at least one of the local refresh reset signal and the local refresh data enable signal is at the second level, and make the output second enable signal be at the first level otherwise.

7. The screen drive circuit of claim 1, wherein the display drive chip comprises a mobile industry processor interface;

The mobile industry processor interface decodes the control command sent by the application processor to determine the pixels to be refreshed; and the control command carries the coordinates of the pixel needing refreshing.

8. The screen driving circuit according to claim 1, wherein the first level is a low level and the second level is a high level.

9. A screen refresh method, the method comprising:

according to the pixels to be refreshed, a first enabling signal is sent to a row driving circuit, a second enabling signal is sent to a column driving circuit, when the first enabling signal and the second enabling signal are pulse signals, a screen is subjected to local refreshing under the driving of the row driving circuit and the column driving circuit, when the first enabling signal is at a first level and the second enabling signal is at a second level, the screen is subjected to global refreshing under the driving of the row driving circuit and the column driving circuit, and the row driving circuit is used for generating row driving signals for driving pixel rows of the screen; the column driving circuit is used for inputting the data signals output by the display driving chip into the pixel circuit, and the pixel circuit is used for refreshing the display content of the screen.

10. The screen refresh method of claim 9, wherein the sending a first enable signal to the row driver circuit, in particular, comprises:

11. The screen refresh method of claim 10, wherein a duration of the partial refresh reset signal being at a first level is a first period of time, and a period of time the partial refresh reset signal being at a second level is a second period of time, the first period of time and the second period of time being fixed.

12. The screen refresh method of claim 10, wherein a duration of the partial refresh reset signal being at a first level is a first period of time, a period of time the partial refresh reset signal being at a second level is a second period of time, a combination of sets of settings of the first period of time and the second period of time being predetermined and stored in a register of the display driver chip; the method further comprises the steps of:

13. The screen refreshing method according to claim 10, wherein a duration of the partial refresh reset signal at a first level is a first period of time, a period of time of the partial refresh reset signal at a second level is a second period of time, a plurality of sets of setting combinations of the first period of time and the second period of time are predetermined and stored in a register of the display driving chip, and a basic frame rate of the screen is adjustable; the method further comprises the steps of:

and determining a corresponding set of setting combinations from the multiple sets of setting combinations according to the current basic frame rate of the screen.

14. The screen refresh method of any one of claims 10 to 13, wherein the nematic driving circuit sends a second enable signal, comprising:

15. The screen refresh method of claim 1, wherein the pixel being refreshed as needed, before sending the first enable signal to the row driver circuit and the second enable signal to the column driver circuit, the method further comprises:

And determining the pixel to be refreshed according to a control command sent by the application processor, wherein the control command carries the coordinates of the pixel to be refreshed.

16. An electronic device, characterized in that the electronic device comprises the screen driving circuit of any one of claims 1-8, further comprising a screen;

the screen comprises a pixel array and a pixel driving circuit;

the pixel array is a display area of the screen;

the output end of the screen driving circuit is connected with the input end of the pixel driving circuit;

and the pixel driving circuit is used for driving the pixel array to refresh display contents.