CN113741848A

CN113741848A - Image display method, DDIC, display screen module and terminal

Info

Publication number: CN113741848A
Application number: CN202111078927.3A
Authority: CN
Inventors: 高延凯; 王月文; 蔡辉跃; 苗守飞; 钟柳和
Original assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Current assignee: Guangdong Oppo Mobile Telecommunications Corp Ltd
Priority date: 2021-09-15
Filing date: 2021-09-15
Publication date: 2021-12-03
Anticipated expiration: 2041-09-15
Also published as: CN113741848B; WO2023040591A1

Abstract

The embodiment of the application discloses an image display method, a DDIC, a display screen module and a terminal. The method is used for DDIC of a display screen and comprises the following steps: starting frame compensation; in response to receiving the kth frame of image data sent by the AP, carrying out image scanning on the kth frame of image based on the kth frame of image data; performing frame compensation on the kth frame image based on the target compensation frequency in response to completion of image scanning, and outputting a TE signal in a frame compensation process; in response to receiving the (k + 1) th frame of image data sent by the AP to the DDIC and completing the frame compensation of the (k) th frame of image, performing image scanning on the (k + 1) th frame of image based on the (k + 1) th frame of image data. Because DDIC continues to compensate frames in the process of image display, the problem of image flicker can be avoided, and DDIC does not need to carry out extra self-refresh even if AP has display sending delay, which is beneficial to reducing display power consumption.

Description

Image 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 an image Display method, a Display Driver Integrated Circuit (DDIC), a Display screen module and a terminal.

Background

With the continuous development of display screen technology, high refresh rate display screens are in operation, and in order to take display fluency and power consumption into account, more and more high refresh rate display screens start to support dynamic frequency conversion.

In the dynamic frequency conversion process, the DDIC can dynamically adjust the refresh rate of the display screen according to the image drawing speed of the AP, namely, when the application with high frame rate requirement is operated, the refresh rate of the display screen is adjusted up, so that the image fluency is improved; when the application with the low frame rate requirement is operated, the power consumption of the terminal is reduced by adjusting the refresh rate of the display screen downwards. Furthermore, when the AP image drawing speed is slow and the display delay is caused, the DDIC needs to perform self-refresh (refreshing), that is, control the display screen to perform repeated refresh display on the displayed image.

Disclosure of Invention

The embodiment of the application provides an image 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 an image display method, which is used for a DDIC of a display screen, and the method includes:

starting frame compensation;

in response to receiving image data of a k-th frame sent by an Application Processor (AP), performing image scanning on the image of the k-th frame based on the image data of the k-th frame, wherein k is a positive integer;

in response to completing the image scan, performing frame compensation on the k frame image based on a target compensation frequency, and outputting a Tearing Effect (TE) signal in a frame compensation process, wherein the TE signal is used for instructing the AP to transmit image data to the DDIC;

in response to receiving the (k + 1) th frame of image data sent by the AP and completing the frame compensation of the (k) th frame of image, carrying out image scanning on the (k + 1) th frame of image based on the (k + 1) th frame of image data.

On the other hand, the embodiment of the present application provides a DDIC, where the DDIC chip is applied to a display screen, and the DDIC is configured to:

starting frame compensation;

in response to receiving the kth frame of image data sent by the AP, carrying out image scanning on the kth frame of image based on the kth frame of image data, wherein k is a positive integer;

On the other hand, the embodiment of the application provides a display screen module, which comprises a display screen and a DDIC, wherein the DDIC is used for driving the display screen, and the DDIC is used for realizing the image display method according to the above 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 used to implement the image display method according to the above aspect.

In the embodiment of the application, under the condition of starting frame compensation, after completing image scanning based on received image data, DDIC performs frame compensation based on a target compensation frequency, and continuously outputs a TE signal in the frame compensation process, so that AP transmits new image data based on the TE signal, and further continues to perform image scanning based on the new image data when receiving the new image data and completing the frame compensation of the previous frame image; because DDIC continues to carry on the frame compensation in the course of the image display, so can avoid the problem that the picture glimmers, and even if AP sends and shows and delays, DDIC does not need to carry on the extra self-refresh, help to reduce and display the power consumption; in addition, DDIC continuously outputs TE signals in the frame compensation process, thereby increasing the display window of the AP and being beneficial to reducing the display delay of the AP.

Drawings

FIG. 1 is a graph comparing a single-TE signal and a multiple-TE signal, as shown in an exemplary embodiment;

FIG. 2 is a diagram illustrating an image display process under the AP-DDCI-Panel architecture;

FIG. 3 is a diagram illustrating a presentation delay process in accordance with an illustrative embodiment;

FIG. 4 illustrates a flow chart of an image display method shown in an exemplary embodiment of the present application;

FIG. 5 is a diagram illustrating an implementation of a frame compensation process according to an exemplary embodiment of the present application;

FIG. 6 is a graph comparing AP presentation delay with and without continuous frame compensation introduced;

FIG. 7 illustrates a flow chart of an image display method shown in another exemplary embodiment of the present application;

FIG. 8 illustrates a flow chart of an image display method shown in another exemplary embodiment of the present application;

FIG. 9 is a schematic diagram illustrating an implementation of a frame compensation process according to another exemplary embodiment of the present application;

FIGS. 10 and 11 are comparative diagrams of image display processes with and without continuous frame compensation introduced;

fig. 12 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.

For convenience of understanding, terms referred to in the embodiments of the present application will be described below.

DDIC: the chip for driving the display screen to display images has the functions of controlling the display panel to perform self-luminescence, image display, frame compensation and the like. In the image display process, after receiving image data from the AP through the MIPI, the DDIC drives the display panel to perform image scanning based on the image data, and therefore image display is achieved.

Frame compensation (compensation): a process for optically compensating a display picture (i.e., a currently displayed image frame) based on Gamma (Gamma) parameters is provided to prevent abrupt changes in picture brightness during non-image scanning.

Tear Effect (TE) signal: a signal generated by a DDIC is used for preventing tearing problem when a picture is refreshed in the process of image display. The DDIC generates the TE signal when it controls that one frame of image is refreshed and is ready to refresh the next frame of image.

Alternatively, the TE signal may be a single-TE signal or a multiple-TE signal. The single-TE signal is a continuous high-level TE signal output by the DDIC, and the multiple-TE signal is a continuous TE signal output by the DDIC according to a preset frequency. In some embodiments, the single-TE signal is a TE signal generated at a lower frequency and having a longer duration of high level, and the multiple-TE signal is a TE signal generated at a higher frequency and having a shorter duration of high level. Accordingly, when the DDIC outputs a single-TE signal, the AP transmits new image data to the DDIC when detecting that the TE signal is in a high level state; when the DDIC outputs a multiple-TE signal, the AP transmits new image data to the DDIC upon detecting a rising edge of the TE signal.

In an illustrative example, as shown in fig. 1, in the image display process, after the a-frame image scanning is completed, the DDIC continuously outputs a multiple-TE signal 4 times at a frequency of 360Hz, or outputs a single-TE signal having a high level duration of 3/360-8.3 ms; after completing the B, C frame image scan, the DDIC continuously outputs a multiple-TE signal 5 times at a frequency of 360Hz, or outputs a single-TE signal with a high level duration of 4/360 ═ 11.1 ms.

Emission (EM) frequency: the EM signal is a panel row switching signal for controlling whether the pixels of the current row emit light. Correspondingly, the EM frequency is the reporting frequency for generating the EM signal, that is, the light emitting frequency of the pixels in the current row. Generally, the EM frequency is an integer multiple of the Gate frequency, i.e., the EM switching is performed multiple times within one frame of the Gate, wherein the Gate frequency is the on-off frequency of the Gate (corresponding to the pixel row in the display panel). For example, when the Gate frequency is 60Hz, the EM frequency is 240Hz or 360 Hz.

As shown in fig. 2, under the 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 the 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. And when the adaptive frequency conversion is realized, the DDIC can adaptively adjust the refresh frequency according to the output frame rate of the AP. For example, DDIC may decrease the refresh rate when the output frame rate of the AP decreases, and may increase the refresh rate when the output frame rate of the AP increases.

In this case, the AP does not immediately send display after completing the image data preparation (i.e., immediately transmits image data to the DDIC after completing the image data preparation), but sends display when detecting the TE signal output by the DDIC. However, since the AP has a difference in the speed of preparing the image data (for example, in a game scene, the speed of preparing the image data by the AP is 120FPS because the screen content is updated quickly, and in an electronic book reading scene, the speed of preparing the image data by the AP is 10FPS because the screen content is kept unchanged for a long time), when the image data preparation speed is slow, the AP may miss the TE signal output by the DDIC (i.e., miss the rendering window), thereby causing a rendering delay. Accordingly, since new image data issued by the AP is not received, the DDIC needs to perform self-refresh based on the last received image data, that is, repeatedly refresh and display the old (refreshed and displayed) image frame, and from the perspective of the user, the problems of image blocking and image flickering may occur in this case.

Illustratively, as shown in fig. 3, after image scanning is performed on the image frame a by the DDIC, the TE signal is output based on the light emission frequency (i.e., the TE signal is generated at the same frequency as the light emission frequency). After the image frame B is prepared, when the AP detects a rising edge of the TE signal, the AP transmits image data of the image frame B to the DDIC, the DDIC performs image scanning on the image frame B, and after the image scanning, the AP continues to output the TE signal based on the light emission frequency. The slow speed of preparing the image frame C by the AP causes that the image frame C has missed the display window (i.e. 4 TE signals output by the DDIC) when the preparation of the image frame C is completed, at this time, the DDIC needs to perform self-refresh according to the image data of the image frame B (i.e. the DDIC needs to control the display screen to perform self-refresh when not receiving the image data issued by the AP after outputting the preset number of TE signals), and outputs the TE signal again after completing the self-refresh, and correspondingly, the AP transmits the image data of the image frame C to the DDIC after detecting that the DDIC performs the self-refresh according to the image data of the image frame B and outputs the TE signal again.

It can be seen from the above process that DDIC in the related art needs to perform self-refresh when AP misses the display window, causing extra power consumption; moreover, when the DDIC carries out large-range frequency conversion, the problem of flicker of a display picture can occur, and the user experience is influenced; in addition, the AP easily misses the display window due to the small display window of the AP, thereby causing display delay.

In order to solve the above technical problem, in the embodiment of the present application, the DDIC starts continuous frame compensation in the image display process, that is, the DDIC performs frame compensation after receiving image data sent by the AP and completing image scanning, that is, performs optical compensation on the currently displayed image frame according to Gamma (Gamma) parameters, so that even if image refreshing is not performed when the AP display sending delay occurs, image flicker can be avoided, thereby avoiding self-refreshing when the AP display sending delay occurs, reducing display power consumption, and solving the image flicker problem in the frequency conversion process. Meanwhile, DDIC continues to output TE signal in the process of frame compensation, so that the effect of increasing the display sending window is achieved, the probability that AP misses the display sending opportunity is reduced, and the effect of reducing AP display sending delay is achieved. In addition, by adopting the scheme provided by the embodiment of the application, logic control is performed by the DDIC after frame compensation is started, and the AP does not need to issue instructions, thereby being beneficial to reducing the realization complexity of the logic at the AP side. The following description will be made using exemplary embodiments.

Referring to fig. 4, a flowchart illustrating an image 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, start frame compensation.

In a possible implementation, the DDIC starts frame compensation in an operating state, that is, a frame compensation strategy is adopted in various scenes; alternatively, the DDIC may start frame compensation in a specific scene, where the specific scene may include a low-brightness display scene (picture flicker problem may be alleviated by turning up brightness in a high-brightness scene), a game running scene (sensitivity to picture flicker is high), and the like, which is not limited in this embodiment.

In other possible embodiments, the frame compensation function may also be turned on or off manually by the user, which is not limited by this embodiment.

Step 402, in response to receiving the kth frame of image data sent by the AP, performing image scanning on the kth frame of image based on the kth frame of image data, where k is a positive integer.

When receiving the image data of the k frame sent by the AP, the DDIC performs image scanning based on the image data of the k frame, thereby controlling a display screen (Panel) to display the image of the k frame.

Illustratively, as shown in fig. 4, after the image frame a is prepared, when the AP detects a rising edge of the TE signal, the AP transmits the image data of the image frame a to the DDIC, and the DDIC scans the image data to display the image frame a.

Step 403, in response to the completion of the image scanning, performing frame compensation on the k frame image based on the target compensation frequency, and outputting a TE signal in the frame compensation process, where the TE signal is used to instruct the AP to transmit image data to the DDIC.

Since the frame compensation is turned on, the DDIC performs the frame compensation on the k frame image after the image scanning is completed. The frame compensation times of the k frame image are at least one time, and the DDIC performs optical compensation by taking a frame as a unit.

In a possible implementation manner, the DDIC performs frame compensation according to a uniform target compensation frequency under different refresh frequencies, so as to reduce implementation complexity of frame compensation. In some embodiments, the target compensation frequency is the highest refresh frequency of the display screen, for example, when the highest refresh frequency of the display screen is 120Hz, the DDIC performs frame compensation at 120Hz, i.e. the duration of each frame compensation is 8.3 ms.

Optionally, the DDIC outputs a TE signal after completing the image scanning, and if the (k + 1) th frame of image data sent by the AP is not received, performs frame compensation on the (k) th frame of image; and if the (k + 1) th frame of image data sent by the AP is received, performing image scanning based on the (k + 1) th frame of image data without performing frame compensation on the (k + 1) th frame of image.

In addition, in order to improve the probability that the TE signal can be detected in time after the AP finishes image preparation, the DDIC continuously outputs the TE signal in the process of frame compensation, so that the display sending window of the AP is enlarged, and the problem that the display sending delay is caused by the fact that the AP misses the display sending window is solved.

Optionally, the DDIC outputs a continuous single-TE signal or outputs a continuous high-level multiple-TE signal during the frame compensation process.

Illustratively, as shown in fig. 5, after the DDIC finishes scanning the image of the image frame a, since the image frame B is not ready, the DDIC performs frame compensation on the image frame a (the frame compensation time is 8.3ms), and continuously outputs the multiple-TE signal during the frame compensation process (the output interval of the TE signal is 2.8 ms).

Similarly, referring to fig. 5, after the DDIC finishes scanning the image of the image frame B, because the image frame C is not ready, the DDIC performs frame compensation on the image frame B, and continuously outputs a multiple-TE signal during the frame compensation process (the output interval of the TE signal is 2.8 ms); since the image frame C is not ready after the first frame compensation, the DDIC needs to perform the frame compensation again and continue to output the multiple-TE signal during the second frame compensation.

Step 404, in response to receiving the (k + 1) th frame of image data sent by the AP and completing frame compensation for the (k) th frame of image, performing image scanning on the (k + 1) th frame of image based on the (k + 1) th frame of image data.

When receiving the (k + 1) th frame of image data sent by the AP and finishing the frame compensation of the (k) th frame of image, the DDIC scans the image based on the (k + 1) th frame of image data and controls the display screen to display the (k + 1) th frame of image.

Illustratively, as shown in fig. 5, since the image frame B is prepared before the first frame compensation of the image frame a is completed, the AP can transmit the image data of the image frame B to the DDIC based on the multiple-TE signal output by the DDIC during the first frame compensation, and accordingly, the DDIC performs image scanning on the image frame B after completing the first frame compensation of the image frame a.

Because the image frame C is prepared before the second frame compensation of the image frame B is completed, the AP can transmit the image data of the image frame B to the DDIC when detecting the TE signal output by the DDIC in the second frame compensation process, and correspondingly, the DDIC performs image scanning on the image frame C after completing the second frame compensation of the image frame B.

As can be seen from fig. 3 and 5, after the frame compensation is started, the DDIC performs the image frame compensation after the image scanning is finished, so that the problem of image flicker is fundamentally solved, and the display power consumption is reduced without performing self-refresh when the AP display delay is delayed; in addition, compared with the scheme without frame compensation, DDIC outputs TE signals during the frame compensation process, and increases the transmission window of AP (the transmission window of image frame C is increased from 8.3ms (i.e. 3 TE signals) in fig. 3 to 16.6ms (i.e. 6 TE signals) in fig. 5), so that AP can issue the prepared image data to DDIC as soon as possible, and the time delay between the image preparation and the image issue is reduced.

In the case where frame compensation is introduced and not introduced when a 60fps (frame Per second) game is run, the presentation delay (the time period from completion of image data preparation to issuance of image data to DDIC) on the AP side is as shown in fig. 6. Obviously, the fluctuation of the AP-side presentation delay is significantly reduced after introducing continuous frame compensation.

To sum up, in the embodiment of the present application, in the case of starting continuous frame compensation, after completing image scanning based on received image data, DDIC performs frame compensation based on a target compensation frequency, and continuously outputs a TE signal in the frame compensation process, so that AP transmits new image data based on the TE signal, and further continues to perform image scanning based on the new image data when receiving the new image data and completing frame compensation on the previous frame image; because DDIC continues to carry on the frame compensation in the course of the image display, so can avoid the problem that the picture glimmers, and even if AP sends and shows and delays, DDIC does not need to carry on the extra self-refresh, help to reduce and display the power consumption; in addition, DDIC continuously outputs TE signals in the frame compensation process, thereby increasing the display window of the AP and being beneficial to reducing the display delay of the AP.

Regarding the way the DDIC outputs the TE signal during frame compensation, in one possible implementation, the DDIC may output a multiple-TE signal at a high frequency, increasing the chance that the AP detects the rising edge of the TE signal. The following description will be made using exemplary embodiments.

Referring to fig. 7, a flowchart illustrating an image 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 701, starting frame compensation.

Step 702, in response to receiving the kth frame of image data sent by the AP, performing image scanning on the kth frame of image based on the kth frame of image data, where k is a positive integer.

The implementation process of steps 701 to 702 may refer to steps 401 to 402, which is not described herein again.

And step 703, in response to the completion of the image scanning, performing frame compensation on the k frame image based on the target compensation frequency, and determining the signal quantity of the multiple-TE signal in a single frame compensation period based on the target compensation frequency and the TE frequency of the multiple-TE signal.

Wherein the TE frequency is the frequency at which the DDIC generates the multiple-TE signal. Optionally, the TE frequency is the same as the EM frequency, or the TE frequency is an integer multiple of the EM frequency. For example, when the EM frequency is 360Hz, the TE frequency may be 360Hz or 720 Hz.

Optionally, the target compensation frequency is the highest refresh frequency of the display screen. In the present embodiment, the target compensation frequency is set to 120Hz as an example, but the target compensation frequency is not limited thereto.

In this embodiment, the DDIC outputs the multiple-TE signal at a high frequency according to the TE frequency, and accordingly, the AP transmits the image data to the DDIC when the image data preparation is completed and the rising edge of the multiple-TE signal is detected. Since the DDIC performs frame compensation on the current picture frame according to the target compensation frequency, that is, the compensation duration of each frame compensation is fixed, in order to ensure that the multiple-TE signal is uniformly output in the frame compensation process, the DDIC needs to determine the signal number of the multiple-TE signal required to be output in a single frame compensation period based on the target compensation frequency and the TE frequency. Wherein the signal quantity is TE frequency ÷ target compensation frequency.

In some embodiments, the DDIC outputs a multiple-TE signal at the EM frequency, i.e., the TE frequency coincides with the EM frequency. For example, when the EM frequency is 360Hz, the DDIC outputs a multiple-TE signal at 360Hz, i.e., outputs a multiple-TE signal every 2.8ms (1000/360); further, when the target compensation frequency is 120Hz, the DDIC needs to output 3 multiple-TE signals during a single frame compensation period.

Step 704, outputting multiple-TE signal in frame compensation process based on TE frequency and number of signals.

Further, the DDIC outputs multiple-TE signals according to the TE frequency during the frame compensation process, and ensures that the number of multiple-TE signals output in each frame compensation period is the determined number of signals.

In one possible implementation, when the speed of preparing image data by AP is slow, DDIC may need to perform frame compensation many times, so each time during the frame compensation process, DDIC needs to detect whether AP transmits image data of the (k + 1) th frame. In response to not receiving the (k + 1) th frame of image data during the frame compensation, the DDIC outputs multiple-TE signals at the TE frequency in units of the number of signals, i.e., the total number of multiple-TE signals output during the frame compensation is an integer multiple of the number of signals.

Optionally, in response to receiving the image data of the (k + 1) th frame during the frame compensation process, the DDIC stops outputting the multiple-TE signal after the current frame compensation is finished.

Illustratively, as shown in fig. 5, the TE frequency of the DDIC output multiple-TE signal is 360Hz, and the frame compensation frequency is 120Hz, and when performing frame compensation on the image frame a, the DDIC outputs 3 multiple-TE signals; since the image data of the image frame C is not received during the first frame compensation process for the image frame B, the DDIC continues to output 3 multiple-TE signals during the second frame compensation process, and thus the total number of multiple-TE signals output by the DDIC is 6 during the frame compensation process for the image frame B.

Step 705, in response to receiving the (k + 1) th frame of image data sent by the AP, completing frame compensation for the (k) th frame of image, and performing image scanning on the (k + 1) th frame of image based on the (k + 1) th frame of image data.

The implementation of this step can refer to step 304, which is not described herein again.

In this embodiment, the DDIC increases the display window of the AP by outputting the multiple-TE signal at a high frequency during the frame compensation, so that the AP can transmit the prepared image data to the DDIC in time based on the multiple-TE signal, thereby reducing the display delay of the AP and further reducing the image display delay.

In another possible implementation, the DDIC may output a single-TE signal, increasing the chance that the AP detects a high level of the TE signal. The following description will be made using exemplary embodiments.

Referring to fig. 8, a flowchart illustrating an image 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, start frame compensation.

Step 802, in response to receiving the kth frame of image data sent by the AP, performing image scanning on the kth frame of image based on the kth frame of image data, where k is a positive integer.

The implementation process of steps 801 to 802 may refer to steps 401 to 402, which is not described herein again.

And 803, in response to the completion of the image scanning, performing frame compensation on the kth frame image based on the target compensation frequency, and determining a single compensation time length based on the target compensation frequency.

In this embodiment, the DDIC outputs a continuous high-level single-TE signal when image scan preparation is completed, and accordingly, the AP transmits image data to the DDIC when image data preparation is completed and the high level of the single-TE signal is detected. In order to ensure that the AP can issue the prepared image data in time during the frame compensation period, the DDIC needs to continuously output a high-level single-TE signal during the frame compensation period, i.e. the high-level duration of the single-TE signal is consistent with the frame compensation duration.

In one possible implementation, the DDIC determines a single compensation duration for the single frame compensation based on the target compensation frequency. The single compensation duration is the duration of high level of single-TE signal output by DDIC in the single frame compensation period.

In one illustrative example, when the target compensation frequency is 120Hz, the DDIC determines that the single frame compensation duration is 8.3 ms.

And step 804, outputting a single-TE signal in the frame compensation process based on the single compensation duration, wherein the duration of the high level of the single-TE signal is integral multiple of the single compensation duration.

When the speed of preparing image data by the AP is slow, the DDIC may need to perform frame compensation many times, and correspondingly, when frame compensation needs to be performed many times, the DDIC needs to extend the duration of the high level of the single-TE signal and ensure that the duration of the high level of the single-TE signal after extension is consistent with the total duration of the frame compensation, that is, the duration of the high level of the single-TE signal is an integral multiple of the duration of a single compensation.

With respect to the manner of extending the duration of the high level of the single-TE signal, in one possible embodiment, the DDIC needs to detect whether the AP transmits the (k + 1) th frame image data every time during the frame compensation process. In response to not receiving the (k + 1) th frame image data in the frame compensation process, the DDIC lengthens the single-TE signal in units of a one-shot compensation duration.

Alternatively, the DDIC stops extending the single-TE signal in response to receiving the (k + 1) th frame image data during the frame compensation process.

Illustratively, as shown in fig. 9, DDIC determines a single frame compensation duration to be 8.3ms based on the target compensation frequency of 120 Hz. During the frame compensation of the image frame A, the DDIC outputs a single-TE signal with a high level duration of 8.3 ms; during the frame compensation of the image frame B, since the image data of the image frame C is not received in the first frame compensation process for the image frame B, the DDIC lasts the high level of the single-TE signal for up to 16.6ms (i.e., the transmission window of the AP is expanded to 16.6 ms).

Step 805, in response to receiving the (k + 1) th frame of image data sent by the AP and completing frame compensation for the (k + 1) th frame of image, performing image scanning on the (k + 1) th frame of image based on the (k + 1) th frame of image data.

In this embodiment, the DDIC outputs a continuous high-level single-TE signal during the frame compensation period to increase the display window of the AP, so that the AP can transmit the prepared image data to the DDIC in time based on the multiple-TE signal, thereby reducing the display delay of the AP and further reducing the image display delay.

In a possible case, the AP may issue image data based on the TE signal output by the DDIC during the frame compensation process, that is, the DDIC receives new image data before the current frame compensation is finished, and in order to ensure complete execution of the frame compensation, in one possible embodiment, in response to receiving the (k + 1) th frame image data sent by the AP during the frame compensation process, the DDIC continues to perform frame compensation on the k-th frame image; in response to completion of the frame compensation, the DDIC performs image scanning on the (k + 1) th frame image based on the (k + 1) th frame image data, avoiding interruption of the frame compensation in the middle.

Since new image scanning is performed after the current frame compensation is completed, the response time of the DDIC is correspondingly delayed, and the delay range is from 0 to a single frame compensation duration. For example, when the target compensation frequency is 120Hz, the delay range of the response time of the DDIC is 0 to 8.3 ms.

Illustratively, as shown in fig. 10, when the reference frame rate applied by the foreground (i.e. the AP prepares image data at the reference frame rate during operation and ensures that the display frame rate remains stable within a certain range above and below the reference frame rate) is 60FPS, after the start of the frame compensation mechanism is introduced, when receiving the image data of the image frame a sent by the AP, the DDIC performs frame compensation on the previous frame, and therefore the DDIC needs to scan the image frame a after waiting for the end of the frame compensation of the previous image frame. Similarly, the image frames B and D need to wait for the completion of the frame compensation before performing image scanning. Compared with the method without introducing the continuous open frame compensation mechanism, the image display speeds of the two mechanisms are kept consistent, obvious delay is avoided, and the problem of image flicker in the frequency conversion process can be solved (when the continuous open frame compensation mechanism is not introduced, the image flicker can occur due to different keeping time lengths of the image frames under different refreshing frequencies).

As shown in fig. 11, when the reference frame rate applied by the foreground is 90FPS, after the start frame compensation mechanism is introduced, the end of frame compensation of the previous frame needs to be waited before the image scanning is performed on the image frame A, B, D, E. Compared with the method without introducing the continuous opening frame compensation mechanism, the image display speed is basically kept consistent (only lags by one EMpulse), obvious delay does not occur, and the problem of picture flicker in the frequency conversion process can be eliminated. Therefore, the scheme provided by the embodiment of the application can be suitable for the application programs with different reference frame rates.

In some embodiments, the method provided by the embodiments of the present application is applied to a mobile terminal, that is, the DDIC chip of the display screen in the mobile terminal executes the image 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 used for the mobile terminal, the DDIC can be prevented from performing additional self-refresh, and the display power consumption is 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.

In addition, in this application embodiment, the display screen is Low Temperature Polycrystalline Oxide (LTPO) display screen, because the particularity of LTPO display screen design, it can take place the scintillation when frequency conversion on a large scale, consequently can use the scheme that this application embodiment provided, improves the display effect of frequency conversion on a large scale to LTPO display screen.

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

starting frame compensation;

in response to receiving the kth frame of image data sent by the application processor AP, carrying out image scanning on the kth frame of image based on the kth frame of image data, wherein k is a positive integer;

Optionally, the TE signal is a single-TE signal, the single-TE signal is a TE signal of a continuous high level output by the DDIC, and the AP is configured to transmit image data to the DDIC when the high level of the single-TE signal is detected;

the DDIC is used for:

determining a single compensation duration based on the target compensation frequency;

outputting the single-TE signal in a frame compensation process based on the single compensation duration, wherein the duration of the high level of the single-TE signal is integral multiple of the single compensation duration.

Optionally, the DDIC is configured to:

in response to not receiving the (k + 1) th frame of image data in a frame compensation process, extending the single-TE signal in units of the single compensation duration.

Optionally, the TE signal is a multiple-TE signal, the multiple-TE signal is a continuous TE signal output by the DDIC according to a preset frequency, and the AP is configured to transmit image data to the DDIC when a rising edge of the multiple-TE signal is detected;

the DDIC is used for:

determining a signal number of the multiple-TE signal during a single frame compensation period based on the target compensation frequency and the TE frequency of the multiple-TE signal;

outputting the multiple-TE signal in a frame compensation process based on the TE frequency and the number of signals.

Optionally, the DDIC is configured to:

in response to not receiving the (k + 1) th frame image data in a frame compensation process, outputting the multiple-TE signal at the TE frequency in units of the signal number.

Optionally, the TE frequency is the same as the luminous EM frequency of the display screen, or the TE frequency is an integer multiple of the EM frequency.

Optionally, the DDIC is further configured to:

responding to the k +1 th frame of image data sent by the AP received in the frame compensation process, and continuing to perform frame compensation on the k frame of image;

performing image scanning on the (k + 1) th frame image based on the (k + 1) th frame image data in response to completion of frame compensation on the (k + 1) th frame image.

Optionally, the target compensation frequency is the highest refresh frequency of the display screen, or the target compensation frequency is an integer multiple of the highest refresh frequency of the display screen.

Optionally, the DDIC is applied to an organic light emitting diode OLED display screen.

Optionally, the DDIC is applied to a low temperature poly-oxide LTPO display screen.

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

The detailed process of implementing the image display method by the DDIC may refer to the above embodiments of the method, and this embodiment is not described herein again.

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

Referring to fig. 12, a block diagram of a terminal 1200 according to an exemplary embodiment of the present application is shown. The terminal 1200 may be a smart phone, a tablet computer, a notebook computer, or the like. The terminal 1200 in the present application may include one or more of the following components: processor 1210, memory 1220, display screen module 1230.

Processor 1210 may include one or more processing cores. The processor 1210, using various interfaces and lines to connect various parts throughout the terminal 1200, performs various functions of the terminal 1200 and processes data by executing or executing instructions, programs, code sets, or instruction sets stored in the memory 1220, and calling data stored in the memory 1220. Alternatively, the processor 1210 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 1210 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 to be displayed by the touch screen module 1230; the NPU is used for realizing an Artificial Intelligence (AI) function; the modem is used to handle wireless communications. It is understood that the modem may not be integrated into the processor 1210, but may be implemented by a single chip.

The Memory 1220 may include a Random Access Memory (RAM) or a Read-Only Memory (ROM). Optionally, the memory 1220 includes a non-transitory computer-readable medium. The memory 1220 may be used to store instructions, programs, code, sets of codes, or sets of instructions. The memory 1220 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 1200, and the like.

The display module 1230 is a display module for displaying images, and is generally disposed on the front panel of the terminal 1200. The display screen module 1230 may be designed as a full-screen, curved screen, odd-shaped screen, double-sided screen, or folding screen. The display screen module 1230 can be designed to be a combination of a full-screen and a curved-surface screen, or 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 1230 includes a DDIC1231 and a display screen 1232 (panel). The display screen 1232 is 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.

DDIC1231 is used to drive the display screen 1232 for image display, and DDIC1231 is used to implement the image display methods provided by the various embodiments described above. In addition, the DDIC1231 is connected to the processor 1210 through an MIPI interface, and is configured to receive image data and instructions sent by the processor 1210.

In a possible implementation manner, the display screen module 1230 further has a touch function, and through the touch function, a user can use any suitable object such as a finger, a touch pen, and the like to perform a touch operation on the display screen module 1230.

In addition, those skilled in the art will appreciate that the configuration of terminal 1200 illustrated in the above-described figures is not meant to be limiting with respect to terminal 1200, 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 1200 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. An image display method, characterized in that, a display driver chip DDIC for a display panel, the method comprises:

starting frame compensation;

2. The method of claim 1, wherein the TE signal is a single-TE signal, the single-TE signal is a TE signal of a continuously high level output by the DDIC, and the AP is configured to transmit image data to the DDIC when detecting the high level of the single-TE signal;

the outputting the TE signal in the frame compensation process includes:

3. The method of claim 2, wherein outputting the single-TE signal in a frame compensation process based on the one-time compensation duration comprises:

4. The method of claim 1, wherein the TE signal is a multiple-TE signal, the multiple-TE signal is a continuous TE signal output by the DDIC at a preset frequency, and the AP is configured to transmit image data to the DDIC when a rising edge of the multiple-TE signal is detected;

the outputting the TE signal in the frame compensation process includes:

5. The method of claim 4, wherein outputting the multiple-TE signal in a frame compensation process based on the TE frequency and the number of signals comprises:

6. The method of claim 4, wherein the TE frequency is the same as the illuminating EM frequency of the display screen, or wherein the TE frequency is an integer multiple of the EM frequency.

7. The method according to any one of claims 1 to 6, wherein the performing image scanning on the (k + 1) th frame image based on the (k + 1) th frame image data in response to receiving the (k + 1) th frame image data sent by the AP and completing the frame compensation on the k +1 th frame image comprises:

8. The method according to any one of claims 1 to 6, wherein the target compensation frequency is the highest refresh frequency of the display screen, or wherein the target compensation frequency is an integer multiple of the highest refresh frequency of the display screen.

9. The method of any of claims 1 to 6, wherein the DDIC is applied to an Organic Light Emitting Diode (OLED) display.

10. The method of any of claims 1 to 6, wherein the DDIC is applied to a low temperature poly-oxide LTPO display.

11. The method according to any of claims 1 to 6, wherein the method is used for a DDIC of a display screen in a mobile terminal.

12. A display driving chip DDIC is characterized in that the DDIC chip is applied to a display screen and is used for:

starting frame compensation;

13. A DDIC as in claim 12, wherein the TE signal is a single-TE signal, the single-TE signal is a TE signal of a continuously high level output by the DDIC, and the AP is configured to transmit image data to the DDIC when detecting the high level of the single-TE signal;

the DDIC is used for:

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

15. A DDIC as in claim 12, wherein the TE signal is a multiple-TE signal, the multiple-TE signal is a continuous TE signal output by the DDIC at a preset frequency, and the AP is configured to transmit image data to the DDIC when a rising edge of the multiple-TE signal is detected;

the DDIC is used for:

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

17. A DDIC as in claim 15, wherein the TE frequency is the same as the illuminating EM frequency of the display screen, or wherein the TE frequency is an integer multiple of the EM frequency.

18. A DDIC as in any of claims 12 to 17, further configured to:

19. A DDIC as in any of claims 12 to 17, wherein the target compensation frequency is a highest refresh frequency of the display screen, or wherein the target compensation frequency is an integer multiple of the highest refresh frequency of the display screen.

20. A DDIC as in any of claims 12 to 17, applied to an organic light emitting diode, OLED, display.

21. A DDIC as in any of claims 12 to 17, applied to a low temperature poly-oxide LTPO display.

22. A DDIC as in any of claims 12 to 17, wherein the DDIC is a DDIC for a display in a mobile terminal.

23. A display screen module, characterized in that the display screen module comprises a display screen and a display driver chip DDIC, the DDIC is used for driving the display screen, and the DDIC is used for implementing the image display method according to any one of claims 1 to 11.

24. A terminal, characterized in that the terminal comprises an application processor AP, a display screen and a display driver chip DDIC, the AP and the DDIC are connected through a mobile industry processor interface MIPI, and the DDIC is used for implementing the image display method according to any one of claims 1 to 11.