CN113608713A

CN113608713A - Variable frequency display method, DDIC, display screen module and terminal

Info

Publication number: CN113608713A
Application number: CN202110869095.0A
Authority: CN
Inventors: 王月文; 高延凯; 蔡辉跃
Original assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Current assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Priority date: 2021-07-30
Filing date: 2021-07-30
Publication date: 2021-11-05
Anticipated expiration: 2041-07-30
Also published as: WO2023005558A1; CN113608713B

Abstract

The embodiment of the application discloses a variable frequency display method, a DDIC, a display screen module and a terminal. The method comprises the following steps: responding to the received nth frame of image data sent by the AP, determining a current display scene based on historical image data sending parameters of the AP, wherein the historical image data sending parameters are obtained by counting the receiving condition of the historical image data through DDIC; determining a target refreshing frequency corresponding to a current display scene, wherein different display scenes correspond to different refreshing frequencies; and controlling the display screen to display the image based on the target refreshing frequency and the nth frame of image data. By adopting the scheme provided by the embodiment of the application, the statistics of the content updating speed is carried out by the DDIC, and the DDIC carries out statistics through hardware logic, so that the display scene can be judged frame by frame, the refreshing frequency can be adjusted frame by frame, and the timeliness and the accuracy of the adjustment of the refreshing frequency are improved.

Description

Variable frequency display method, DDIC, display screen module and terminal

Technical Field

The embodiment of the application relates to the technical field of Display, in particular to a variable frequency Display method, a Display Driver Integrated Circuit (DDIC), a Display screen module and a terminal.

Background

With the continuous development of display screen technologies, more and more display screens capable of supporting high-refresh-rate display are developed, and when a high-frame-rate application program is operated or in the sliding operation process, the fluency of a picture can be improved by setting the display screen to be in a high-refresh-rate mode.

For an Active-Matrix Organic Light-Emitting Diode (AMOLED) display screen, limited by a driving structure of an Application Processor (AP) -DDIC-Panel (Panel) and self-Light-Emitting characteristics of the AMOLED display screen, in the related art, an AP end calculates an average frame rate within a period of time, so as to control the DDIC to adjust a refresh frequency according to the average frame rate.

However, since the AP needs to count the number of frames through software, and if the counting duration is too short, too much resources are occupied, resulting in increased power consumption, a larger counting duration, for example, 1s, is usually set. However, the larger statistical duration results in a lag in the adjustment of the refresh frequency and a less accurate adjustment.

Disclosure of Invention

The embodiment of the application provides a variable frequency display method, a DDIC, a display screen module and a terminal. The technical scheme is as follows:

in one aspect, an embodiment of the present application provides a variable frequency display method, where the method is used for a DDIC of a display screen, and the method includes:

in response to receiving the nth frame of image data sent by the AP, determining a current display scene based on historical image data sending parameters of the AP, wherein the historical image data sending parameters are obtained by counting the receiving condition of the historical image data by the DDIC;

determining a target refreshing frequency corresponding to the current display scene, wherein different display scenes correspond to different refreshing frequencies;

and controlling a display screen to display an image based on the target refreshing frequency and the nth frame of image data.

In another aspect, an embodiment of the present application provides a DDIC, where the DDIC is applied to a display screen, and the DDIC is configured to:

On the other hand, the embodiment of the application provides a display screen module, the display screen module comprises a display screen and a DDIC, the DDIC is used for driving the display screen, and the DDIC is used for realizing the frequency conversion display method in the aspect.

On the other hand, an embodiment of the present application provides a terminal, where the terminal includes an AP, a display screen, and a DDIC, where the AP and the DDIC are connected through a Mobile Industry Processor Interface (MIPI), and the DDIC is configured to implement the frequency conversion display method according to the above aspect.

In the embodiment of the application, the DDIC obtains the historical image data sending parameters of the AP by counting the receiving condition of the historical image data, so that when the image data sent by the AP is received, the current display scene is determined according to the historical image data sending parameters, the target refreshing frequency suitable for the current display scene is further determined, and finally the display screen is controlled to display the image based on the target refreshing frequency; by adopting the scheme provided by the embodiment of the application, the statistics of the content updating speed is carried out by the DDIC, and the DDIC carries out statistics through hardware logic, so that the display scene can be judged frame by frame, the refreshing frequency can be adjusted frame by frame, and the timeliness and the accuracy of the adjustment of the refreshing frequency are improved; in addition, different refreshing frequencies are set for different display scenes, and when image data sent by the AP are received, the refreshing frequency adopted subsequently is determined based on the display scene judgment result, so that the self-adaptive dynamic frequency conversion of the display screen is realized, the display quality under different display scenes is ensured, and the reduction of the power consumption of the display screen is facilitated.

Drawings

FIG. 1 is a diagram illustrating an image display process under the AP-DDCI-Panel architecture;

FIG. 2 is a diagram illustrating an embodiment of an AP adjusting a refresh frequency according to an average frame rate indication DDIC in the related art;

FIG. 3 is a schematic diagram of an embodiment in which DDIC actively adjusts the refresh rate according to the historical image data transmission parameters of the AP;

FIG. 4 is a flow chart illustrating a variable frequency display method according to an exemplary embodiment of the present application;

FIG. 5 is a flow chart illustrating a variable frequency display method according to another exemplary embodiment of the present application;

FIG. 6 is a diagram illustrating an adaptive frequency conversion process in a dynamic display scenario according to an exemplary embodiment of the present application;

FIG. 7 is a diagram illustrating an adaptive frequency conversion process in a static display scenario according to an exemplary embodiment of the present application;

FIG. 8 is a flow chart illustrating a variable frequency display method according to another exemplary embodiment of the present application;

FIG. 9 is a schematic diagram illustrating an implementation of a display scene switching process according to an exemplary embodiment of the present application;

FIG. 10 is a schematic diagram illustrating an implementation of a display scene switching process according to another exemplary embodiment of the present application;

fig. 11 is a block diagram illustrating a structure of a terminal according to an exemplary embodiment of the present application.

Detailed Description

To make the objects, technical solutions and advantages of the present application more clear, embodiments of the present application will be described in further detail below with reference to the accompanying drawings.

Reference herein to "a plurality" means two or more. "and/or" describes the association relationship of the associated objects, meaning that there may be three relationships, e.g., a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship.

As shown in fig. 1, under an AP-DDIC-Panel architecture, an AP side first performs layer rendering through an Application program (App), then performs layer composition on a rendered layer through a surface flicker to obtain image data, and further sends (writes) the image data to the DDIC through MIPI. The DDIC stores the image data sent from the AP to the Buffer, and controls Panel to perform image refresh Display (Display) by scanning (reading) the image data in the Buffer. Under a high-refresh-rate display scene, the AP side generates image data at high frequency, and correspondingly, the Panel side carries out high-frequency image refreshing according to the image data, so that the fluency of the picture is improved.

In the practical application process, besides the need of realizing a high refresh rate in a high frame rate game, the high frame rate is mainly applied to a small amount of fast sliding scenes such as desktop sliding and album browsing, and the purpose of the method is to improve the fluency of the picture when a user executes fast sliding operation. However, the fast sliding occupies a small time proportion in practical application, and most of the usage scenes are still static display, low-speed sliding and low-frame-rate video playing scenes. In the above usage scenario, the image rendering speed at the AP side is reduced, and the Panel side still maintains a high refresh rate to perform image refresh (when the AP side does not send new image data, the DDIC controls the Panel to perform repeated display of a single frame image according to recently received image data), which does not improve the smoothness of the image, but increases the power consumption of the display screen.

In the related art, in order to reduce the power consumption of the high refresh rate display screen, the AP end counts the number of frames of image data sent to the DDIC by the AP within a period of time through software, so as to determine an average frame rate within the counted period according to the number of frames, and further send a refresh frequency adjustment instruction to the DDIC based on the average frame rate, so that the DDIC adjusts the refresh frequency based on the instruction.

Because the AP needs to occupy a certain processing resource when executing the software logic, the statistical period is usually set to be longer, for example, 1s, in consideration of power consumption, that is, the number of frames of image data sent by the AP in 1s is counted, so as to determine the average frame rate in 1 s. In an illustrative example, the AP counts that 30 frames of image data have been sent within the last 1s, thereby determining that the average frame rate is 30 fps.

However, the average frame rate can only reflect the average sending rate of the image data in the statistical time period, but cannot reflect the real-time image data sending situation of the AP, and particularly, in the case of a longer statistical time period, the average frame rate calculated by the AP has obvious hysteresis and is poor in accuracy, which is likely to cause an improper adjustment of the subsequent refresh frequency.

Illustratively, as shown in fig. 2, in the statistical period, the AP transmits 30 frames of image data in the first 500ms (DDIC scans from new image data transmitted by the AP in the first 500 ms), and does not transmit image data in the second 500ms (DDIC scans from the latest image data in the second 500 ms), and the AP determines the average frame rate to be 30fps based on the total number of frames of image data transmitted in the statistical period being 30 frames, and cannot recognize that the picture in the second 500ms is in a still state. Further, the AP instructs DDIC to adjust the refresh frequency to 30Hz based on the average frame rate of 30 fps. However, since the picture is still (i.e. in a static display scene) 500ms later, the DDIC could set a lower refresh frequency to reduce power consumption, but in practice the DDIC still maintains a higher refresh frequency, resulting in increased display power consumption.

In order to solve the above technical problem, in the variable frequency display method provided in the embodiment of the present application, a DDIC determines a historical image data transmission parameter of an AP based on a reception condition of the historical image data, so as to determine a current display scene based on the parameter. Since the DDIC executes the above-described flow through hardware logic, frame-by-frame determination can be realized, which is helpful for improving the real-time and accuracy of determination of a display scene. Furthermore, the DDIC determines a target refresh frequency based on the current display scene, so that the display screen is controlled to refresh and display images based on the target refresh frequency, self-adaptive adjustment of the refresh frequency under different display scenes is realized, the image display quality is ensured, and the display power consumption can be reduced.

When the scheme provided by the embodiment of the present application is applied to the above exemplary scenario, as shown in fig. 3, the DDIC can perform frame-by-frame determination, so that after receiving image data sent by the AP, the DDIC can recognize that the DDIC is in a static display scenario for the last 500ms, and thus a lower refresh frequency (for example, 1Hz) is set for image display, and display power consumption is reduced.

The whole adjusting process is actively executed by the DDIC (not triggered by a frequency conversion instruction sent by the AP), so that the adjusting process is simplified, and the real-time performance and the accuracy of frequency conversion are improved. The following description will be made by using exemplary embodiments.

Referring to fig. 4, a flowchart of a variable frequency display method according to an exemplary embodiment of the present application is shown. This embodiment is exemplified by DDIC applied to a display screen by this method. The method comprises the following steps:

step 401, in response to receiving the nth frame image data sent by the AP, determining the current display scene based on the historical image data sending parameters of the AP, where the historical image data sending parameters are obtained by the DDIC through statistics of the receiving conditions of the historical image data.

In one possible implementation, the DDIC determines whether the image data transmitted by the AP is received frame by frame, so as to determine the historical image data transmission parameters of the AP according to the image data reception situation. Because DDIC judges frame by frame through executing hardware logic, the historical image data sending parameter determined by DDIC is more accurate than the average frame rate determined by AP through software logic, and the real-time content updating speed of AP can be more accurately reflected.

In the embodiment of the application, the historical image data sending parameter is used for representing the real-time content updating speed of the AP. In some embodiments, the historical image data transmission parameter is an interval between the most recent transmission of image data by the AP and the current time. Correspondingly, the DDIC updates the historical image data sending parameters each time the DDIC judges that the AP does not send new image data; when the DDIC receives new image data transmitted from the AP, the history image data transmission parameter is reset.

In other embodiments, the historical image data sending parameter is a frame rate of the AP within a latest preset duration, the frame rate is determined by the DDIC according to a receiving condition of the image data within the preset duration, and the DDIC can determine the receiving condition of the image data frame by frame through hardware logic, so that the preset duration is much shorter than a statistical duration adopted when the average frame rate is determined by the AP, and accordingly, the frame rate can more accurately reflect a real-time content updating speed of the AP. For example, the preset time period is 50 ms.

Optionally, when receiving the image data sent by the AP, the DDIC obtains a currently maintained historical image data sending parameter, thereby determining a current display scene according to the historical image sending parameter, and executing the adaptive frequency conversion logic.

In a possible implementation, the DDIC sets at least two display scenes in advance, and sets a mapping relationship between different display scenes corresponding to different content update speeds and the historical image data transmission parameters. And when the DDIC receives new image data, determining the current display scene from the mapping relation based on the currently maintained historical image data sending parameters. The following embodiments will be described in detail with respect to specific types of display scenarios.

Step 402, determining a target refresh frequency corresponding to a current display scene, wherein different display scenes correspond to different refresh frequencies.

In one possible implementation, different refresh frequencies are set for different display scenarios. After the current display scene is determined, the DDIC further determines a target refresh frequency suitable for the current display scene from a plurality of refresh frequencies.

In some embodiments, the target refresh frequency may be an optimal refresh frequency for the current display scenario. Optionally, the optimal refresh rate is a fixed refresh frequency, or a dynamically changing refresh frequency, and the optimal refresh frequency is preset in the DDIC and supports dynamic update.

And step 403, controlling the display screen to display the image based on the target refreshing frequency and the nth frame of image data.

Further, the DDIC controls the display screen to display the nth frame image based on the target refreshing frequency and the nth frame image data, wherein the DDIC controls the display screen to perform frame scanning based on the nth frame image data; after frame scanning is finished, under the condition that the (n + 1) th frame of image data sent by the AP is not received, the display screen is controlled to repeatedly display the nth frame of image based on the target refreshing frequency, namely, the nth frame of image is repeatedly refreshed according to the target refreshing frequency.

In some embodiments, after the DDIC adjusts the refresh frequency, to avoid that the frequency change affects the image display, the DDIC adjusts parameters according to display screen parameters corresponding to the target refresh frequency in the frame register, where the adjusted display screen parameters may include a Gamma parameter and a Demura parameter, which is not limited in this embodiment.

In the process of controlling the display screen to display images based on the target refresh frequency and the nth frame of image data, the DDIC continuously updates the historical image data transmission parameters of the AP according to the receiving condition of the image data, so that when the (n + 1) th frame of image data transmitted by the AP is received, the steps 401 and 402 are executed again, and the adaptive adjustment of the refresh frequency is realized.

In summary, in the embodiment of the present application, the DDIC obtains the historical image data sending parameter of the AP by counting the receiving condition of the historical image data, so that when the image data sent by the AP is received, the current display scene is determined according to the historical image data sending parameter, the target refresh frequency applicable to the current display scene is further determined, and finally, the display screen is controlled to display the image based on the target refresh frequency; by adopting the scheme provided by the embodiment of the application, the statistics of the content updating speed is carried out by the DDIC, and the DDIC carries out statistics through hardware logic, so that the display scene can be judged frame by frame, the refreshing frequency can be adjusted frame by frame, and the timeliness and the accuracy of the adjustment of the refreshing frequency are improved; in addition, different refreshing frequencies are set for different display scenes, and when image data sent by the AP are received, the refreshing frequency adopted subsequently is determined based on the display scene judgment result, so that the self-adaptive dynamic frequency conversion of the display screen is realized, the display quality under different display scenes is ensured, and the reduction of the power consumption of the display screen is facilitated.

In a possible implementation, a counter is arranged in the DDIC, and the count value of the counter is updated according to the frame-by-frame receiving condition of the image data, wherein the count value of the counter is used for representing the interval between the AP sending two adjacent frames of image data, the interval is the time interval between the adjacent frames, and the larger the count value of the counter is, the slower the real-time content updating speed of the AP side is, and accordingly, the DDIC needs to reduce the refreshing frequency; the smaller the count of the counter, the faster the real-time content update speed at the AP side, and accordingly, the DDIC needs to maintain a higher refresh frequency. The following description will be made using exemplary embodiments.

Referring to fig. 5, a flowchart of a variable frequency display method according to another exemplary embodiment of the present application is shown. This embodiment is exemplified by DDIC applied to a display screen by this method. The method comprises the following steps:

step 501, in the case of receiving the n-1 th frame of image data transmitted by the AP, updating the count value of the counter in response to not receiving the n-th frame of image data transmitted by the AP.

In the process that the DDIC controls the display screen to display images according to the n-1 frame of image data sent by the AP, whether the n frame of image data (namely new image data) sent by the AP is received or not is detected, in the process that the DDIC receives the n frame of image data sent by the AP and controls the display screen to display images based on the n frame of image data, whether the n +1 frame of image data sent by the AP is received or not is detected, and therefore frame-by-frame detection of the image data receiving condition is achieved.

In one possible implementation, the DDIC detects whether the image data of the n-th frame (i.e. new image data) transmitted by the AP is received during the image display process according to the image data of the n-1 th frame transmitted by the AP. If the nth frame of image data is not received, executing steps 501 to 502; if the nth frame of image data is received, steps 503 to 507 are executed.

In some embodiments, since the AP may send data other than image data to the DDIC, in the embodiments of the present application, after the DDIC receives the data sent by the AP, if the DDIC resolves that the data contains 0x2C, the data is determined to be image data.

Regarding the specific manner of detection, in one possible implementation, the DDIC outputs a TE signal (for instructing the AP to transmit image data) at a Tearing Effect (TE) frequency (when the AP listens to a rising edge of the TE signal or a high level of the TE signal and prepares for the next frame of image data, the AP transmits the next frame of image data to the DDIC), and detects whether the nth frame of image data transmitted by the AP is received after the TE signal is output.

The TE frequency is a preset frequency, for example, the preset frequency is 120Hz or 240Hz, and the TE frequency is not limited in the embodiments of the present application. In some embodiments, the TE frequency is greater than the highest refresh frequency of the display screen. Optionally, the TE frequency is an integer multiple of the highest refresh frequency of the display screen, for example, the highest refresh rate of the display screen is 120Hz, and the TE frequency is 360 Hz.

If the nth frame image data transmitted by the AP is not received after the TE signal is output, the DDIC updates the count value of the counter. For example, after outputting the TE signal every time, if the nth frame image data is not received, the DDIC performs an operation of adding one to the count value of the counter, which indicates that the interval between the nth-1 frame image data and the nth frame image data is added by one.

Illustratively, as shown in fig. 6, the initial count value of the counter is 0, and after receiving the image data a sent by the AP, the DDIC controls the display screen to display an image based on the image data a, and outputs the TE signal at a frequency of 120 Hz. Since the image data B transmitted by the AP is not received after the TE signal is continuously output 3 times, the count value of the counter is gradually increased from 0 to 3.

In some embodiments, the counter has an upper count limit, and when the count value of the counter needs to be updated, the DDIC detects whether the current count value of the counter reaches the upper count limit, and if so, keeps the current count value, and if not, updates the current count value. Illustratively, as shown in fig. 7, when the upper limit of the counter is 5, if the DDIC does not receive the image data B transmitted by the AP after continuously outputting the TE signal 5 times after receiving the image data a transmitted by the AP, the counter value of the counter is kept at 5 and is not updated.

Of course, in other embodiments, the counter may not set an upper limit of the count, which is not limited in this embodiment. Illustratively, as shown in fig. 6, when the counter does not have the upper limit of the count, the DDIC does not receive new image data for a long time after receiving the image data D transmitted by the AP, and the count value of the counter is increased.

And 502, controlling a display screen to display an image based on the current refreshing frequency and the image data of the (n-1) th frame.

Since no new image data is received, the DDIC needs to repeatedly display the (n-1) th frame image based on the current refresh frequency. In the process of repeatedly displaying the image of the (n-1) th frame, the DDIC continues to detect whether the image data of the (n) th frame is received.

Step 503, in response to receiving the nth frame of image data sent by the AP, obtaining a count value of a counter, where the count value of the counter is used to represent an interval between the nth-1 frame of image data and the nth frame of image data.

By setting the counter, the DDIC can count the interval between two adjacent frames of image data frame by frame, so as to determine the real-time content updating speed of the AP based on the interval, and therefore, when the nth frame of image data sent by the AP is received, the DDIC obtains the current count value of the counter, so that the subsequent refresh frequency is adaptively adjusted based on the count value, and the refresh frequency on the DDIC side is matched with the real-time content updating speed on the AP side.

In one possible implementation, if the nth frame image data sent by the AP is received after the TE signal is output, the DDIC obtains the count value of the counter.

Illustratively, as shown in fig. 6, when image data B transmitted by the AP is received, the DDIC acquires that the count value of the counter is 3; when receiving image data C sent by the AP, the DDIC obtains the count value of the counter to be 3; when receiving the image data D transmitted by the AP, the DDIC acquires that the count value of the counter is 3.

At step 504, a current display scene is determined based on the count value of the counter.

In this embodiment, at least two display scenes are divided in advance based on the interval between adjacent image frames, that is, different display scenes correspond to different content update speeds. After the obtained count value of the counter, the DDIC determines the current display scene according to the count value.

In one possible embodiment, the display scene is divided into a static display scene and a dynamic display scene, wherein the frequency of image data transmission by the AP in the static display scene is lower than the frequency of image data transmission by the AP in the dynamic display scene. For example, the static display scene is a scene such as a picture display and a text display (the frequency of transmitting image data by the AP is generally lower than 20fps), and the dynamic display scene is a scene such as a video play and a game (the frequency of transmitting image data by the AP is generally higher than 20 fps).

Accordingly, the interval corresponding to the static display scene is greater than the interval corresponding to the dynamic display scene. For example, in a static display scenario, the interval between adjacent image frames is 5 to 12 counting units (counting is performed with a TE frequency of 120 Hz); in a dynamic display scene, the interval between adjacent image frames is 1 to 4 count units.

Optionally, the DDIC divides the two display scenarios by setting a count threshold. In response to the count value of the counter being greater than or equal to the count threshold, the DDIC determines that the current display scene is a static display scene; in response to the count value of the counter being less than the count threshold, the DDIC determines that the current display scene is a dynamic display scene.

Wherein, the counting threshold value can be preset in the DDIC and supports dynamic update.

For example, the count threshold is set to 5, that is, when the count value of the counter does not reach 5, the DDIC determines that the current display scene is the dynamic display scene, and when the count value of the counter reaches 5, the DDIC determines that the current display scene is the static display scene.

Illustratively, as shown in fig. 6, when receiving the image data B, C, D sent by the AP, the DDIC determines that the current display scene is a dynamic display scene because the count value of the counter is 3 < the count threshold 5; as shown in fig. 7, when image data a transmitted by the AP is received, the DDIC determines that the current display scene is a static display scene because the count value of the counter is 5, i.e., the count threshold is 5.

Of course, in addition to the two display scenes, in other possible embodiments, the DDIC may also divide three or more display scenes, for example, a static display scene (count value range: > 10), a partial static display scene (count value range: 6-10), a partial dynamic display scene (count value range: 3-5), and a dynamic display scene (count value range: 0-2), and the embodiments of the present application do not limit the specific division manner of the display scenes.

And 505, determining a target refresh frequency corresponding to the current display scene.

For different display scenes, DDIC presets a refresh frequency suitable for the display scene, and after the current display scene is determined, DDIC determines a target refresh frequency suitable for the current display scene.

Optionally, the target refresh frequency is an optimal refresh frequency in the current display scene, or the target refresh frequency is a highest refresh frequency in the current display scene (which is adjusted downward based on the highest refresh frequency in the following).

In one possible implementation, when the display scene includes a static display scene and a dynamic display scene, in response to the current display scene being the static display scene, the DDIC determines the target refresh frequency as a first refresh frequency; in response to the current display scene being a dynamic display scene, the DDIC determines the target refresh frequency as a second refresh frequency. The first refresh rate may be a highest refresh rate in a static display scene, and the second refresh rate may be a highest refresh rate in a dynamic display scene.

Because the content updating speed of the AP is slow in the static display scene, in order to reduce the display power consumption, the DDIC sets a low refresh frequency, such as 10Hz, 1Hz, and the like, for the static display scene; and the content updating speed of the AP under the dynamic display scene is higher. Therefore, in order to improve the smoothness of the image display, the DDIC sets a high refresh rate, such as 60Hz, 30Hz, etc., for the dynamic display scene.

In addition, in the practical application process, it is found that when the content updating speed is slow, if a lower refreshing frequency is directly used, a more obvious smear phenomenon occurs, and the smear phenomenon can be eliminated only by reducing the refreshing frequency to a low refreshing frequency after refreshing for several frames at a high refreshing frequency; when the content updating speed is high and the refreshing frequency is matched with the content updating speed, the smear phenomenon is slight and is not easy to be perceived by a user.

Therefore, to avoid the smear problem in the static display scenario, in one possible implementation, the first refresh frequency is higher than the picture update frequency in the static display scenario, and the second refresh frequency matches the picture update frequency in the dynamic display scenario. And when image display is subsequently carried out in the static display scene, the DDIC adjusts the refreshing frequency down on the basis of the first refreshing frequency, so that the display power consumption in the static display scene is reduced under the condition of solving the smear problem.

Optionally, the first refresh frequency is an integer multiple of a picture update frequency in a static display scene, and the second refresh frequency is a picture update frequency in a dynamic display scene.

For example, when the picture update frequency in a static display scene is 10fps, the first refresh frequency may be set to 120Hz or 60Hz, so that the smear is eliminated by refreshing several frames of images with high frequency; the second refresh rate may be set to 30Hz when the picture update rate in the dynamic display scene is 30 fps.

Illustratively, as shown in fig. 6, DDIC, upon receiving image data A, B, C, D, determines that it is in a dynamic display scene, and determines the refresh frequency to be 30 Hz; as shown in fig. 7, when receiving image data a, DDIC determines that it is in a static display scene, and in order to avoid the smear problem, determines the refresh frequency to be 120Hz, and continuously refreshes multiple frames, and in the subsequent display process, the refresh frequency is gradually reduced, and the display power consumption is reduced.

In step 506, the count value of the counter is cleared.

In some embodiments, after receiving new image data and completing the refresh frequency adjustment each time, the DDIC needs to perform a zero clearing operation on the count value of the counter (i.e., reset the count to 0), so as to avoid affecting the subsequent display scene determination.

Illustratively, as shown in fig. 6, the DDIC resets the count value of the counter to 0 upon receiving the image data A, B, C, D.

And step 507, controlling the display screen to display the image based on the target refreshing frequency and the nth frame of image data.

Further, the DDIC controls the display screen to display the image based on the determined target refresh frequency and the nth frame image data. And under the condition that the image data of the (n + 1) th frame is not received, the DDIC controls the display screen to repeatedly display the image according to the target refreshing frequency.

Illustratively, as shown in fig. 6, when image data a is received but image data B is not received, DDIC performs image display at a refresh frequency of 30Hz based on image data a (since the frequency of transmitting image data by the AP side is 30fps, images are not repeatedly displayed). On the other hand, when the image data D is received but the subsequent image data is not received, the DDIC performs repeated display based on the image data D.

As shown in fig. 7, in the case where image data a is received but subsequent image data is not received, the DDIC first performs image display at a refresh frequency of 120Hz to avoid the problem of smear in a static display scene, and then gradually reduces the refresh frequency to reduce display power consumption.

In the process of displaying the nth frame image, the DDIC executes the above steps in a loop to detect whether the nth +1 th frame image data is received, which is not described herein again.

In the embodiment, the display scene is divided into a static display scene and a dynamic display scene, and the counter is used for counting the interval between two adjacent frames of image data, so that when new image data is received, the current display scene is determined based on the relationship between the count value of the counter and the count threshold value, the refresh frequency is adjusted to be the target refresh frequency suitable for the current display scene, and the self-adaptive frequency conversion is realized; the whole frequency conversion logic is completed by the DDIC, the power consumption of the terminal cannot be increased, the frequency conversion logic can be realized by means of the counter, the realization process is simple, and the frequency conversion efficiency is improved.

In addition, when new image data is received and the current static display scene is judged, the DDIC sets a high refresh frequency to refresh and display the image, thereby avoiding the phenomenon of smear and being beneficial to improving the image display quality under the static display scene.

Since the content update speed on the AP side has uncertainty, for example, when the video playing is finished, the content update speed on the AP side is reduced from 30fps to 10fps, in addition to performing adaptive frequency conversion when image data is received, the DDIC needs to implement adaptive frequency reduction when the AP does not transmit new image data and the content update speed is reduced, so as to reduce the display power consumption, and the following description uses an exemplary embodiment.

Referring to fig. 8, a flowchart of a variable frequency display method according to another exemplary embodiment of the present application is shown. This embodiment is exemplified by DDIC applied to a display screen by this method. The method comprises the following steps:

step 801, in the case of receiving the n-1 th frame of image data transmitted by the AP, updating the count value of the counter in response to not receiving the n-th frame of image data transmitted by the AP.

And step 802, controlling a display screen to display images based on the current refreshing frequency and the image data of the (n-1) th frame.

In response to receiving the nth frame of image data sent by the AP, a count value of a counter is obtained, where the count value of the counter is used to represent an interval between the nth-1 frame of image data and the nth frame of image data.

At step 804, a current display scene is determined based on the count value of the counter.

Step 805, determining a target refresh frequency corresponding to the current display scene.

The implementation of steps 801 to 805 can refer to steps 501 to 505, and this embodiment is not described herein again.

At step 806, an upper limit of the number of times the refresh frequency is maintained is determined based on the target refresh frequency.

The upper limit of the number of times of keeping the refresh frequency refers to the upper limit of the number of times of refreshing the image based on the current refresh frequency when the new image data is not received, and once the upper limit of the number of times is reached, the DDIC needs to execute a down-conversion logic.

The different refresh frequencies correspond to respective upper limits of the number of times of refreshing, and the upper limits of the number of times of refreshing can be set and obtained based on the display characteristics of the display screen under the different refresh frequencies. The different refresh frequencies may correspond to the same upper limit of the number of times of refresh frequency retention, or may correspond to the upper limit of the number of times of refresh frequency retention, which is not limited in this embodiment.

Illustratively, as shown in fig. 6, in a dynamic display scenario, the DDIC determines the number of times of refresh frequency maintenance to be 2 times based on the target refresh frequency of 30 Hz; as shown in fig. 7, the DDIC determines the refresh frequency retention number to be 2 times based on the target refresh frequency of 120Hz in the static display scenario.

In step 807, the count value of the counter is cleared.

In one possible implementation, in the process of displaying the image by the DDIC based on the current refresh frequency, whether the adaptive down-conversion is needed or not needs to be determined based on the number of times the current refresh frequency is kept. If the number of retained times reaches the upper limit of the number of retained times of the refresh frequency, determining that frequency reduction is needed, and executing the following steps 810 to 811; if the number of retained times does not reach the upper limit of the number of retained times of the refresh frequency, it is determined that the image refresh is continued at the current refresh frequency, and the following steps 808 to 809 are performed.

In some embodiments, the DDIC may set a hold number counter for recording the number of held times of the current refresh frequency.

And 808, in response to that the image data of the (n + 1) th frame sent by the AP is not received and the retained frequency does not reach the upper limit of the retaining frequency of the refresh frequency, controlling the display screen to display the image based on the target refresh frequency and the image data of the nth frame.

And under the condition that the image data of the next frame is not received, if the number of times of keeping does not reach the upper limit of the number of times of keeping the refreshing frequency, the DDIC controls the display screen to display the image based on the target refreshing frequency and the image data of the nth frame.

Illustratively, as shown in fig. 6, after receiving image data D, DDIC first performs image display based on image data D, and when new image data is not received after continuously outputting TE signals 4 times, since the number of times of retention of the current refresh frequency 30Hz is 1 and the upper limit of the number of times of retention of the refresh frequency is not reached to 2 times, DDIC performs image display based on image data D again; as shown in fig. 7, after receiving image data a, DDIC first performs image display based on image data a, and when new image data is not received, DDIC performs image display based on image data D again because the number of times of holding of current refresh frequency 120Hz is 1 and does not reach the upper limit of the number of times of holding of refresh frequency 2.

Step 809, update the held times.

In some embodiments, each time an image display is completed, the DDIC performs an add-on operation on the number of times it has been held.

Step 810, in response to that the image data of the (n + 1) th frame sent by the AP is not received and the number of retained times reaches the upper limit of the number of retained times of the refresh frequency, adjusting the target refresh frequency to a third refresh frequency.

And under the condition that the image data of the next frame is not received, if the number of times of keeping reaches the upper limit of the number of times of keeping the refreshing frequency, the DDIC carries out self-adaptive frequency reduction, and reduces the target refreshing frequency to a third refreshing frequency. In a possible implementation, the target refresh frequency is the highest refresh frequency of the current display scene, that is, in a case where no new image data is received, the DDIC reduces the refresh frequency based on the highest refresh frequency of the current display scene to reduce the display power consumption.

Illustratively, a plurality of refresh frequencies corresponding to the static display scene and the dynamic display scene are shown in table one, and the DDIC performs down-conversion according to the current display scene and the descending order of the refresh frequencies.

Watch 1

Static display scene	120Hz	60Hz	30Hz	10Hz
					Dynamic display of scenes	30Hz	10Hz	-	-

Optionally, in the process of reducing the refresh frequency, the DDIC may directly reduce the target refresh frequency to the third refresh frequency; or, the DDIC may gradually reduce the target refresh frequency to the third refresh frequency, so as to avoid the influence on the screen display caused by the too large change amplitude of the refresh frequency. It should be noted that, in the process of gradually lowering the refresh frequency, after lowering the refresh frequency by one stage each time, the DDIC needs to execute the refresh frequency maintaining procedure (i.e. determining the upper limit of the refresh frequency maintaining times, updating the maintained times, and determining the maintained times), which is not described herein again in this embodiment.

Illustratively, as shown in fig. 6, in the process of displaying an image based on image data D, when the number of times of holding has reached 2 times, the DDIC reduces the refresh frequency from 30Hz to 10Hz, thereby reducing the number of times of image refresh and reducing the display power consumption without new image data; as shown in fig. 7, in the image display process based on the image data a, when the number of times of holding has reached 2 times, the DDIC gradually adjusts the refresh frequency down from 120Hz to 10Hz (120Hz → 60Hz → 30Hz → 10Hz), thereby reducing the number of times of image refresh and reducing the display power consumption without new image data.

And step 811, controlling the display screen to display the image based on the third refresh frequency and the nth frame of image data.

And the DDIC carries out image repeated display based on the adjusted third refresh frequency and the nth frame of image data, and continuously detects whether the next frame of image data is received or not in the display process.

In addition to determining whether frequency reduction is required by comparing the held times with the upper limit of the refresh frequency holding times, in another possible implementation, the DDIC may perform a subtraction operation on the upper limit of the refresh frequency holding times after each image display, so as to perform adaptive frequency reduction when the upper limit of the refresh frequency holding times reaches 0 times, which is not limited in this embodiment. For example, when the upper limit of the number of times of the refresh frequency retention is 2 times, the DDIC updates the upper limit of the number of times of the refresh frequency retention to 1 time after the first image display, and updates the upper limit of the number of times of the refresh frequency retention to 0 time after the second image display, and performs adaptive down-conversion.

In this embodiment, by setting the upper limit of the number of times of maintaining the refresh frequency for the refresh frequency and updating the number of times of maintaining after each image display under the condition that no new image data is received, when the number of times of maintaining reaches the upper limit of the number of times of maintaining the refresh frequency, adaptive down-conversion is triggered, so that the refresh frequency of the DDIC side is matched with the content update rate of the AP side, and the display power consumption is further reduced.

In the foregoing exemplary embodiment, an adaptive frequency conversion process in a single display scene is described, and a switching process between different display scenes is described below using the exemplary embodiment.

As shown in fig. 9, when DDIC receives image data A, B, C transmitted from AP, DDIC determines that the current display scene is a dynamic scene based on the count value of the counter and the count threshold, and performs image refresh display at a refresh frequency of 30 Hz. When image display is performed based on image data C, since the number of times of holding has reached 2 times, DDIC executes down-conversion logic, reducing the refresh frequency. When image data D sent by the AP is received in the process of continuously displaying the image of the frame C, the DDIC determines that the current display scene is a static display scene because the count value of the counter reaches a count threshold value of 5, so that the refresh frequency is set to be 120Hz, and the refresh frequency is gradually reduced according to the refresh frequency keeping time upper limit for 2 times.

As shown in fig. 10, when DDIC receives image data a sent by AP, it first enters a static display scene, performs image refresh display at a refresh frequency of 120Hz, and executes down-conversion logic when the number of times of hold has reached 2 times. When the frequency is reduced to 30Hz, the DDIC receives the image data B sent by the AP, because the counting value of the counter reaches a counting threshold value of 5, the DDIC determines that the current display scene is still a static display scene, carries out image refreshing display at a refreshing frequency of 120Hz, and executes a frequency reduction logic when the number of times of keeping reaches 2 times. When the frequency is reduced to 60Hz, the DDIC receives the image data C sent by the AP, and since the count value (count value of 3) of the counter does not reach the count threshold value of 5, the DDIC determines that the current display scene is changed to the dynamic display scene, thereby setting the refresh frequency to 30Hz, and performs image refresh display according to the refresh frequency keeping number upper limit of 2 times (since the image data D is received before the count value reaches 5, repeated refresh of the image is not required).

In some embodiments, the method provided by the embodiments of the present application is applied to a mobile terminal, that is, the DDIC of the OLED display screen in the mobile terminal executes the above frequency conversion display method. Because the mobile terminal is usually powered by a battery, and the electric quantity of the battery is limited (the battery is sensitive to power consumption), after the method provided by the embodiment of the application is applied to the mobile terminal, the display quality of the mobile terminal is improved, and the power consumption of the mobile terminal can be reduced. The mobile terminal may include a smart phone, a tablet computer, a wearable device (such as a smart watch), a portable personal computer, and the like, and the specific type of the mobile terminal is not limited in the embodiments of the present application.

Of course, the method provided in the embodiment of the present application may also be used for other non-battery-powered terminals, such as televisions, displays, personal computers, and the like, which is not limited in the embodiment of the present application.

The embodiment of the application further provides a DDIC, which is applied to a display screen and is used for:

Optionally, the DDIC is configured to:

acquiring a count value of a counter, wherein the count value of the counter is used for representing an interval between the n-1 th frame of image data and the nth frame of image data;

determining the current display scene based on the count value of the counter;

and carrying out zero clearing operation on the count value of the counter.

Optionally, the DDIC is configured to:

determining that the current display scene is a static display scene in response to the count value of the counter being greater than or equal to a count threshold;

determining that the current display scene is a dynamic display scene in response to the count value of the counter being less than the count threshold;

wherein the frequency of transmitting image data by the AP in the static display scene is lower than the frequency of transmitting image data by the AP in the dynamic display scene.

Optionally, the DDIC is configured to:

in response to that the current display scene is the static display scene, determining the target refresh frequency as a first refresh frequency, wherein the first refresh frequency is the highest refresh frequency in the static display scene;

and in response to the current display scene being the dynamic display scene, determining the target refresh frequency as a second refresh frequency, wherein the second refresh frequency is the highest refresh frequency in the dynamic display scene.

Optionally, the first refresh frequency is higher than the picture update frequency in the static display scene;

the second refresh frequency is matched with a picture update frequency in the dynamic display scene.

Optionally, the DDIC is further configured to:

and in the case of receiving the n-1 frame of image data transmitted by the AP, updating the count value of the counter in response to not receiving the n frame of image data transmitted by the AP.

Optionally, the DDIC is configured to:

outputting a TE signal based on a tearing effect TE frequency, wherein the TE signal is used for instructing the AP to send image data;

and updating the count value of the counter in response to the situation that the nth frame of image data sent by the AP is not received after the TE signal is output.

Optionally, the TE frequency is an integer multiple of the highest refresh frequency of the display screen.

Optionally, the DDIC is further configured to:

determining a refresh frequency keeping time upper limit based on the target refresh frequency;

responding to that the n +1 th frame of image data sent by the AP is not received and the number of times of the retained image data does not reach the upper limit of the number of times of the refreshing frequency, and controlling a display screen to display the image based on the target refreshing frequency and the n frame of image data;

updating the held times.

Optionally, the target refresh frequency is the highest refresh frequency in the current display scene;

the DDIC is further configured to:

in response to that the image data of the (n + 1) th frame sent by the AP is not received and the kept number reaches the upper limit of the keeping number of the refreshing frequency, the target refreshing frequency is adjusted downwards to a third refreshing frequency;

and controlling a display screen to display images based on the third refresh frequency and the nth frame of image data.

Optionally, the third refresh frequency is the lowest refresh frequency in the current display scene;

the DDIC is used for:

and gradually reducing the target refreshing frequency to the third refreshing frequency.

Optionally, the DDIC is a DDIC of an OLED display screen in the mobile terminal.

For the detailed process of implementing the variable frequency display method by the DDIC, reference may be made to the above embodiments of the method, and this embodiment is not described herein again.

In addition, the embodiment of the application further provides a display screen module, wherein the display screen module comprises a display screen and a DDIC, the DDIC is used for driving the display screen, and the DDIC is used for realizing the frequency conversion display method provided by the above method embodiments.

Referring to fig. 10, a block diagram of a terminal 1100 according to an exemplary embodiment of the present application is shown. The terminal 1100 may be a smart phone, a tablet computer, a notebook computer, etc. Terminal 1100 in the present application may include one or more of the following components: processor 1110, memory 1120, display screen module 1130.

The processor 1110 may include one or more processing cores, and the processor 1110 may be an AP as described in the above embodiments. The processor 1110 interfaces with various interfaces and circuitry throughout the various portions of the terminal 1100, and performs various functions of the terminal 1100 and processes data by executing or executing instructions, programs, code sets, or instruction sets stored in the memory 1120, and invoking data stored in the memory 1120. Alternatively, the processor 1110 may be implemented in hardware using at least one of Digital Signal Processing (DSP), Field-Programmable Gate Array (FPGA), and Programmable Logic Array (PLA). The processor 1110 may integrate one or more of a Central Processing Unit (CPU), a Graphics Processing Unit (GPU), a Neural-Network Processing Unit (NPU), a modem, and the like. Wherein, the CPU mainly processes an operating system, a user interface, an application program and the like; the GPU is responsible for rendering and drawing the content that the touch display screen module 1130 needs to display; the NPU is used for realizing an Artificial Intelligence (AI) function; the modem is used to handle wireless communications. It is to be understood that the modem may not be integrated into the processor 1110, but may be implemented by a single chip.

The Memory 1120 may include a Random Access Memory (RAM) or a Read-Only Memory (ROM). Optionally, the memory 1120 includes a non-transitory computer-readable medium. The memory 1120 may be used to store instructions, programs, code, sets of codes, or sets of instructions. The memory 1120 may include a stored program area and a stored data area, wherein the stored program area may store instructions for implementing an operating system, instructions for at least one function (such as a touch function, a sound playing function, an image playing function, etc.), instructions for implementing various method embodiments of the present application, and the like; the storage data area may store data (such as audio data, a phonebook) created according to the use of the terminal 1100, and the like.

The display screen module 1130 is a display component for displaying images, and is generally disposed on the front panel of the terminal 1100. Display screen module 1130 may be designed as a full-face screen, curved screen, contoured screen, double-face screen, or folding screen. The display screen module 1130 may also be designed to be a combination of a full-screen and a curved-surface screen, and a combination of a special-shaped screen and a curved-surface screen, which is not limited in this embodiment.

In the embodiment of the present application, the display screen module 1130 includes a DDIC1131 and a display screen 1132 (panel). The display screen 1132 may be an OLED display screen, which may be a Low Temperature Polysilicon (LTPS) AMOLED display screen or a Low Temperature Polysilicon Oxide (LTPO) AMOLED display screen.

DDIC1131 is used to drive display screen 1132 for image display, and DDIC1131 is used to implement the frequency conversion display method provided by the above embodiments. In addition, the DDIC1131 is connected to the processor 1110 through an MIPI interface, and is configured to receive image data and instructions sent by the processor 1110.

In one possible implementation, the display screen module 1130 further has a touch function, and a user can perform a touch operation on the display screen module 1130 by using any suitable object such as a finger, a touch pen, and the like through the touch function.

In addition, those skilled in the art will appreciate that the configuration of terminal 1100 illustrated in the above-described figures does not constitute a limitation of terminal 1100, and that terminals may include more or less components than those illustrated, or some components may be combined, or a different arrangement of components. For example, the terminal 1100 further includes a microphone, a speaker, a radio frequency circuit, an input unit, a sensor, an audio circuit, a Wireless Fidelity (WiFi) module, a power supply, a bluetooth module, and other components, which are not described herein again.

Those skilled in the art will recognize that, in one or more of the examples described above, the functions described in the embodiments of the present application may be implemented in hardware, software, firmware, or any combination thereof. When implemented in software, the functions may be stored on or transmitted over as one or more instructions or code on a computer-readable medium. Computer-readable media includes both computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another. A storage media may be any available media that can be accessed by a general purpose or special purpose computer.

The above description is only exemplary of the present application and should not be taken as limiting, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A frequency conversion display method is characterized in that the method is used for a display driving circuit chip DDIC of a display screen, and the method comprises the following steps:

in response to receiving the nth frame of image data sent by an Application Processor (AP), determining a current display scene based on historical image data sending parameters of the AP, wherein the historical image data sending parameters are obtained by counting the receiving condition of the historical image data by the digital data converter (DDIC);

2. The method of claim 1, wherein determining the current display scene based on historical image data transmissions by the AP comprises:

determining the current display scene based on the count value of the counter;

and carrying out zero clearing operation on the count value of the counter.

3. The method of claim 2, wherein determining the current display scene based on the count value of the counter comprises:

4. The method of claim 3, wherein the determining the target refresh frequency corresponding to the currently displayed scene comprises:

5. The method of claim 4,

the first refreshing frequency is higher than the picture updating frequency under the static display scene;

6. The method of claim 2, wherein in response to receiving the nth frame of image data transmitted by the AP, the method further comprises, before determining the current scene to be displayed based on historical image data transmission parameters of the AP:

7. The method according to claim 6, wherein said updating the count value of the counter in response to not receiving the nth frame of image data transmitted by the AP comprises:

and updating the count value of the counter in response to that the nth frame of image data sent by the AP is not received after the TE signal is output.

8. The method of claim 7, wherein the TE frequency is an integer multiple of a highest refresh frequency of the display screen.

9. The method according to any one of claims 1 to 8, further comprising:

the controlling a display screen to display an image based on the target refreshing frequency and the nth frame of image data comprises the following steps:

updating the held times.

10. The method of claim 9, wherein the target refresh frequency is a highest refresh frequency in the currently displayed scene;

the method further comprises the following steps:

11. The method of claim 10, wherein the third refresh frequency is a lowest refresh frequency in the currently displayed scene;

the adjusting the target refresh frequency down to a third refresh frequency includes:

12. The method according to any of claims 1 to 8, wherein the method is used for DDIC of an organic light emitting diode, OLED, display in a mobile terminal.

13. A display driving circuit chip DDIC, wherein the DDIC is applied to a display screen, and the DDIC is used for:

14. A DDIC as in claim 13, wherein the DDIC is configured to:

determining the current display scene based on the count value of the counter;

and carrying out zero clearing operation on the count value of the counter.

15. A DDIC as in claim 14, wherein the DDIC is to:

16. A DDIC as in claim 15, wherein the DDIC is configured to:

17. A DDIC as in claim 16,

18. A DDIC as in claim 14, further configured to:

19. A DDIC as in claim 18, wherein the DDIC is configured to:

20. A DDIC as in claim 19, wherein the TE frequency is an integer multiple of a highest refresh frequency of the display.

21. A DDIC as in any of claims 13 to 20, further configured to:

updating the held times.

22. A DDIC as in claim 21, wherein the target refresh frequency is a highest refresh frequency in the current display scenario;

the DDIC is further configured to:

23. A DDIC as in claim 22, wherein the fifth refresh frequency is a lowest refresh frequency for the current display scenario;

the DDIC is used for:

24. A DDIC as in any of claims 13 to 20, wherein the DDIC is a DDIC of an organic light emitting diode, OLED, display in a mobile terminal.

25. A display screen module, characterized in that, the display screen module comprises a display screen and a display driving circuit chip DDIC, the DDIC is used for driving the display screen, and the DDIC is used for realizing the frequency conversion display method according to any one of claims 1 to 12.

26. A terminal, characterized in that the terminal comprises an application processor AP, a display screen and a display driver circuit chip DDIC, the AP is connected to the DDIC through a mobile industry processor interface MIPI, and the DDIC is used to implement the frequency conversion display method according to any one of claims 1 to 12.