Display method, display device and storage medium

Abstract

The invention relates to a display method, a display device and a storage medium. The display method comprises the steps of determining current display brightness of a display screen of the electronic equipment; in response to the fact that the current display brightness is smaller than a first brightness threshold value and smaller than a second brightness threshold value, the first frequency is determined as the target dimming frequency, and the first frequency is higher than a preset frequency threshold value; and setting a current dimming frequency according to the target dimming frequency, and performing screen dimming on the display screen by using a pulse width modulation (PWM) dimming mode according to the current dimming frequency. According to the invention, in the display brightness interval corresponding to PWM dimming, the interval is divided into two brightness ranges according to the preset brightness threshold value, dimming is carried out on the display screen by adopting the dimming frequency higher than the preset frequency in the PWM dimming mode in the relatively low brightness range, and the brightness of the display screen is adjusted on the premise of ensuring the endurance of the electronic equipment. Ultrahigh-frequency PWM dimming under low display brightness is achieved, the problem of low-brightness flicker is effectively solved, and display and eye protection are achieved.

Description

Technical Field

[0001] The present disclosure relates to the field of screen display, and in particular, to a display method, a display device, and a storage medium. Background Art

[0002] Active-Matrix Organic Light-Emitting Diode (AMOLED) screen technology is a common screen solution for electronic devices such as mobile phones and tablets in the current market. Organic Light-Emitting Diode (OLED) screens have natural advantages such as self-luminescence, wide color gamut, and low power consumption.

[0003] OLED screens generally adopt a dimming method of direct current (DC) plus pulse width modulation (PWM), that is, DC dimming is used at high display brightness, and PWM dimming is used at other display brightness for high-frequency (such as 1920 Hz) dimming, which will cause screen flickering problems and have an adverse impact on the user's visual fatigue and eye health. Summary of the Invention

[0004] To overcome the problems in the related art, the present disclosure provides a display method, a display device, and a storage medium.

[0005] According to a first aspect of an embodiment of the present disclosure, a display method is provided, including: determining a current display brightness of a display screen of an electronic device; in response to the current display brightness being less than a first brightness threshold and the current display brightness being less than a second brightness threshold, determining a first frequency as a target dimming frequency; the first brightness threshold is used to control the switching between pulse width modulation (PWM) dimming mode and direct current (DC) dimming mode, and the first brightness threshold is greater than the second brightness threshold, and the first frequency is higher than a preset frequency threshold; setting a current dimming frequency according to the target dimming frequency, and performing screen dimming on the display screen using the pulse width modulation (PWM) dimming mode according to the current dimming frequency.

[0006] In an implementation manner, the method further includes: in response to the current display brightness being less than the first brightness threshold and the current display brightness being greater than or equal to the second brightness threshold, determining a second frequency as the target dimming frequency, and the second frequency is lower than the preset frequency threshold.

[0007] In one implementation, there is a corresponding relationship between the dimming frequency of the PWM dimming method and the number of pulses per unit time. Setting the current dimming frequency according to the target dimming frequency includes: according to the corresponding relationship between the dimming frequency and the number of pulses per unit time, setting the number of pulses per unit time corresponding to the target dimming frequency as the number of pulses per unit time currently.

[0008] In one implementation, the method further includes: in response to the current display brightness being less than the first brightness threshold and the current display brightness being less than the second brightness threshold, using a first Gamma value model for screen display; in response to the current display brightness being less than the first brightness threshold and the current display brightness being greater than or equal to the second brightness threshold, using a second Gamma value model for screen display; the first Gamma value model is different from the second Gamma value model; the first Gamma value model and the second Gamma value model are used to determine the driving voltage of the pixel units of the display screen at different gray levels.

[0009] In one implementation, the method further includes: in response to the current display brightness being greater than or equal to the first brightness threshold, using a direct current (DC) dimming method to dim the display screen.

[0010] In one implementation, the electronic device includes an application processor and a display driver chip; the target dimming frequency is determined by the application processor in the following manner: in response to the current display brightness being less than the first brightness threshold and the application processor monitoring that the previous display brightness is less than the second brightness threshold, determining the first frequency as the target dimming frequency by the application processor; in response to the current display brightness being less than the first brightness threshold and the application processor monitoring that the previous display brightness is greater than or equal to the second brightness threshold, determining the first frequency as the target dimming frequency by the application processor; setting the current dimming frequency according to the target dimming frequency includes: controlling the display driver chip to set the current dimming frequency by the application processor according to the target dimming frequency.

[0011] According to a second aspect of the embodiments of the present disclosure, a display device is provided, including: a determination unit configured to determine the current display brightness of the display screen of an electronic device; a processing unit configured to, in response to the current display brightness being less than a first brightness threshold and the current display brightness being less than a second brightness threshold, determine a first frequency as a target dimming frequency; the first brightness threshold is used to control the switching between pulse width modulation (PWM) dimming mode and direct current (DC) dimming mode, and the first brightness threshold is greater than the second brightness threshold, and the first frequency is higher than a preset frequency threshold; an adjustment unit configured to set the current dimming frequency according to the target dimming frequency and perform screen dimming on the display screen using the pulse width modulation (PWM) dimming mode according to the current dimming frequency.

[0012] In one implementation, the processing unit is further configured to: in response to the current display brightness being less than the first brightness threshold and the current display brightness being greater than or equal to the second brightness threshold, determine a second frequency as the target dimming frequency, and the second frequency is lower than the preset frequency threshold.

[0013] In one implementation, there is a corresponding relationship between the dimming frequency of the PWM dimming mode and the number of pulses per unit time. The adjustment unit sets the current dimming frequency according to the target dimming frequency in the following manner, including: according to the corresponding relationship between the dimming frequency and the number of pulses per unit time, setting the number of pulses per unit time corresponding to the target dimming frequency as the number of pulses per unit time in the current situation.

[0014] In one implementation, the adjustment unit is further configured to: in response to the current display brightness being less than the first brightness threshold and the current display brightness being less than the second brightness threshold, use a first Gamma value model for screen display; in response to the current display brightness being less than the first brightness threshold and the current display brightness being greater than or equal to the second brightness threshold, use a second Gamma value model for screen display; the first Gamma value model is different from the second Gamma value model; the first Gamma value model and the second Gamma value model are used to determine the driving voltage of the pixel units of the display screen at different gray levels.

[0015] In one implementation, the adjustment unit is further configured to: in response to the current display brightness being greater than or equal to the first brightness threshold, perform screen dimming on the display screen using the direct current (DC) dimming mode.

[0016] In one implementation, the electronic device includes an application processor and a display driver chip; the target dimming frequency is determined by the application processor in the following manner: in response to the current display brightness being less than a first brightness threshold and the application processor detecting that the previous display brightness is less than a second brightness threshold, the application processor determines the first frequency as the target dimming frequency; in response to the current display brightness being less than the first brightness threshold and the application processor detecting that the previous display brightness is greater than or equal to the second brightness threshold, the application processor determines the first frequency as the target dimming frequency; the adjustment unit sets the current dimming frequency according to the target dimming frequency in the following manner: the application processor controls the display driver chip to set the current dimming frequency according to the target dimming frequency.

[0017] According to a third aspect of the embodiments of the present disclosure, there is provided a display device, including: a processor; a memory for storing processor-executable instructions; wherein, the processor is configured to: execute the display method described in the first aspect or any one of the implementations of the first aspect.

[0018] According to a fourth aspect of the embodiments of the present disclosure, there is provided a storage medium storing instructions that, when executed by a processor, enable the processor to execute the display method described in the first aspect or any one of the implementations of the first aspect.

[0019] The technical solutions provided by the embodiments of the present disclosure may include the following beneficial effects: when it is determined that the current display brightness of the display screen of the electronic device is within the brightness range corresponding to the PWM dimming method, the brightness range is divided into two brightness ranges according to a preset brightness threshold. For the brightness range below the preset brightness threshold, PWM dimming is performed using a dimming frequency higher than the preset frequency threshold. Through the present disclosure, within the display brightness interval corresponding to PWM dimming, the interval is divided into two brightness ranges according to a preset brightness threshold. In the lower brightness range, the display screen is dimmed by the PWM dimming method using a dimming frequency higher than the preset frequency threshold. On the premise of ensuring the battery life of the electronic device, ultra-high frequency PWM dimming at low display brightness is achieved, effectively improving the low brightness flicker problem and achieving the purpose of protecting eyesight during display.

[0020] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and do not limit the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings herein are incorporated into the specification and constitute a part of this specification, showing embodiments consistent with the present disclosure and, together with the specification, are used to explain the principles of the present disclosure.

[0022] Figure 1It is a schematic diagram of a display method shown according to an exemplary embodiment of the present disclosure.

[0023] Figure 2 It is a flowchart of a display method shown according to an exemplary embodiment.

[0024] Figure 3 It is a flowchart of a method for determining a target dimming frequency according to a second brightness threshold shown according to an exemplary embodiment.

[0025] Figure 4 It is a flowchart of a method for setting a current dimming frequency according to a target dimming frequency shown according to an exemplary embodiment.

[0026] Figure 5 It is a flowchart of a display method shown according to an exemplary embodiment.

[0027] Figure 6 It is a flowchart of a display method shown according to an exemplary embodiment.

[0028] Figure 7 It is a schematic diagram of a display method shown according to an exemplary embodiment of the present disclosure.

[0029] Figure 8 It is a schematic diagram of a display method shown according to another exemplary embodiment of the present disclosure.

[0030] Figure 9 It is a block diagram of a display device shown according to an exemplary embodiment.

[0031] Figure 10 It is a block diagram of a device for display shown according to an exemplary embodiment. Detailed implementation manners

[0032] Here, the exemplary embodiments will be described in detail, and the examples are shown in the drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The implementation manners described in the following exemplary embodiments do not represent all the implementation manners consistent with the present disclosure.

[0033] The display method provided by the embodiments of the present disclosure is applied to a scenario where the screen display of an electronic device is adjusted by using a PWM dimming method.

[0034] Mobile phones, tablets and other electronic devices play an increasingly important role in people's life, work and entertainment. Based on the user's demand for the film and television experience of electronic devices, the display screen technology of electronic devices is an aspect that various manufacturers focus on at present. The Active-Matrix Organic Light-Emitting Diode (AMOLED) screen technology is a common screen solution for mobile phones, tablets and other electronic devices in the current market. The Organic Light-Emitting Diode (OLED) screen has natural advantages such as self-luminescence, wide color gamut and low power consumption. There are mainly two dimming methods for the OLED screen, namely Direct Current (DC) dimming and Pulse Width Modulation (PWM) dimming. DC dimming is a dimming method that directly adjusts the display brightness of pixel units by adjusting the driving power (i.e., voltage * current) of the driving pixel units. Since the color display effect of pixel units is affected by current, color deviation problems will occur when DC dimming is used at medium and low brightness. The essence of PWM dimming is to adjust the duration of the screen being turned off and the duration of the screen being turned on within a unit time. If the brightness is reduced, the duration of the screen being turned off within a unit time is increased and the duration of the screen being turned on is reduced; if the brightness is increased, the duration of the screen being turned off within a unit time is reduced and the duration of the screen being turned on is increased, so that the user visually perceives that the display brightness of the screen has changed, while the display brightness of the screen pixel units has not changed, so there will be no color deviation problem at low brightness. In summary, based on the respective characteristics of DC dimming and PWM dimming, the DC+PWM dimming method is generally adopted, that is, DC dimming is used at high display brightness, and PWM dimming is used at medium and low display brightness. DC dimming is used at high display brightness, and PWM dimming is used at other display brightness for high-frequency (such as 1920Hz) dimming. However, based on the principle of the PWM dimming method, the lower the display brightness, the longer the time the screen is turned off within a unit time. Therefore, screen flicker problems will occur when PWM dimming is used at low display brightness. Therefore, the above-mentioned high-frequency (such as 1920HZ) PWM dimming will cause screen flicker problems at low display brightness, which is harmful to the user's eyesight.

[0035] In an exemplary embodiment of the present disclosure, for a display screen with a 120Hz refresh rate, the above DC+PWM dimming method is used for screen dimming, such as Figure 1As shown in the schematic diagram of the display method, this method is implemented through a Display Driver Integrated Circuit (DDIC) and a One Time Programmable (OTP) device. The switching node brightness for switching the number of pulses per unit time (EM pulse) is preset inside the display driver chip: the preset brightness (n + 1) is the node for DC dimming, and the preset brightness (n) is the node for PWM dimming. When the display brightness ≤ the preset brightness (n), that is, when the lowest display brightness (Lvmin / DBV_TH(min) < display brightness ≤ the preset brightness (n)), it is in the Pulse Width Modulation (PWM) region, and the display driver chip will automatically switch to 16 pulses per unit time (i.e., EM to 16pulse) inside, and the modulation frequency is 1920 Hz at this time. When the display brightness ≥ the preset brightness (n + 1), that is, when the preset brightness (n) ≤ display brightness < the highest display brightness (Lvmax / DBV_TH(max)), it is in the Direct Current (DC) region, and the display driver chip will automatically switch to 1 pulse per unit time (i.e., EM to 1pulse). And perform gamma fine-tuning (tuning), and finally complete the gamma one-time programming through the one-time programming device.

[0036] In the related art, there are technical means to increase the dimming frequency and use a higher dimming frequency to achieve ultra-high frequency PWM dimming to solve the problem of screen display flicker when using PWM dimming at the above display brightness. However, increasing the modulation frequency will increase the alternating frequency of the screen turning on and off per unit time, so increasing the modulation frequency will increase the power consumption of the screen display, reduce the battery life of the electronic device, and increasing the modulation frequency has no obvious improvement on the screen display effect at medium display brightness. Therefore, using ultra-high frequency dimming will lead to an increase in terminal power consumption and affect the battery life of the electronic device.

[0037] In view of this, the present disclosure proposes a display method: when it is determined that the current display brightness of the display screen of the electronic device is within the intensity range corresponding to the PWM dimming method, two brightness ranges are set according to the preset brightness threshold, and the display screen is dimmed by using different dimming frequencies through the Pulse Width Modulation (PWM) dimming method in different brightness ranges, effectively improving the low brightness flicker problem on the premise of ensuring the battery life of the electronic device and achieving the purpose of eye protection for display.

[0038] Figure 2 is a flowchart of a display method shown according to an exemplary embodiment. As Figure 2 shown, this method includes steps S101 to S103.

[0039] In step S101, determine the current display brightness of the display screen of the electronic device.

[0040] In step S102, in response to the current display brightness being less than the first brightness threshold and less than the second brightness threshold, the first frequency is determined as the target dimming frequency.

[0041] Wherein, the first brightness threshold is used to control the switching between pulse width modulation (PWM) dimming mode and direct current (DC) dimming mode, and the first brightness threshold is greater than the second brightness threshold, and the first frequency is higher than the preset frequency threshold.

[0042] In step S103, the current dimming frequency is set according to the target dimming frequency, and the display screen is dimmed using the pulse width modulation (PWM) dimming mode according to the current dimming frequency.

[0043] In the embodiment of the present disclosure, on the basis of setting the brightness node (the first brightness threshold) for dividing DC dimming and PWM dimming, a brightness node (the second brightness threshold) for adjusting the PWM dimming frequency is also set. Based on the second brightness threshold, the brightness range for PWM dimming can be divided into a low brightness range (the current display brightness is less than the second brightness threshold) and a medium brightness range (the current display brightness is greater than or equal to the second brightness threshold). A higher dimming frequency (corresponding to the first frequency, such as 3840 Hz) is determined in the low brightness range, and a lower dimming frequency (corresponding to the second frequency, such as 1920 Hz) is determined in the high brightness range.

[0044] In the embodiment of the present disclosure, when the current display brightness of the display screen of the electronic device is less than the first brightness threshold, the PWM dimming mode is adopted for dimming, that is, the display brightness range from the lowest display brightness to the first brightness threshold is the brightness range for PWM dimming. The present disclosure additionally sets a brightness threshold (the second brightness threshold) between the lowest display brightness and the first brightness threshold, and uses the second brightness threshold to divide the brightness range for PWM dimming into two brightness ranges: namely, the lowest display brightness to the second brightness threshold, and the second brightness threshold to the first brightness threshold. Different dimming frequencies are preset within the two different brightness thresholds, so that within the brightness range for PWM dimming, different dimming frequencies are respectively adopted for PWM dimming based on the magnitude relationship between the current display brightness and the second brightness threshold. When the present disclosure performs PWM dimming in the brightness range of the display brightness of the display screen, different dimming frequencies are adopted for dimming the display screen through the pulse width modulation (PWM) dimming mode in different brightness ranges, so as to effectively improve the low brightness flicker problem and achieve the purpose of eye protection for display on the premise of ensuring the battery life of the electronic device.

[0045] It can be understood that PWM dimming essentially adjusts the duration of the screen being off and the duration of the screen being on within a unit time. If the brightness decreases, the duration of the screen being off is increased and the duration of the screen being on is decreased; if the brightness increases, the duration of the screen being off is decreased and the duration of the screen being on is increased, making the user visually perceive that the display brightness of the screen has changed without changing the display brightness of the screen pixel units. The present disclosure determines a higher dimming frequency (such as 3840 Hz) in a low brightness range (i.e., less than the second brightness threshold), and performs PWM dimming on the display screen based on the higher dimming frequency to achieve ultra-high frequency PWM dimming at low brightness.

[0046] It can be understood that in the medium brightness range, the duration of the screen being off and the duration of the screen being on are relatively balanced, and there is basically no problem of screen flickering (the human eye cannot observe screen flickering). Therefore, the present disclosure still uses high frequency (such as 1920 Hz) PWM dimming in the medium brightness range instead of ultra-high frequency (such as 3840 Hz) PWM dimming.

[0047] Figure 3 is a flowchart of a method for determining a target dimming frequency according to a second brightness threshold shown according to an exemplary embodiment. As Figure 3 shown, the method includes steps S201 to S202.

[0048] In step S201, the current display brightness of the display screen of the electronic device is determined.

[0049] In step S202, in response to the current display brightness being less than the first brightness threshold and the current display brightness being greater than or equal to the second brightness threshold, the second frequency is determined as the target dimming frequency.

[0050] Wherein, the second frequency is lower than the preset frequency threshold.

[0051] In the embodiments of the present disclosure, in the medium brightness range, the duration of the screen being off and the duration of the screen being on are relatively balanced, and there is no problem of screen flickering. Therefore, while the present disclosure uses ultra-high frequency (such as 3840 Hz) PWM dimming in the low display brightness range, it uses high frequency (such as 1920 Hz) PWM dimming in the medium display brightness range. On the premise of effectively improving the low brightness flickering problem, it ensures low power consumption in the medium display brightness range and ensures the battery life of the electronic device.

[0052] It can be understood that for PWM dimming, the dimming frequency is adjusted by setting the number of pulses within a unit time. The following embodiments of the present disclosure illustrate the method for setting the current dimming frequency.

[0053] Figure 4 is a flowchart of a method for setting the current dimming frequency according to a target dimming frequency shown according to an exemplary embodiment. AsFigure 4 As shown, the method includes steps S301 to S302.

[0054] In step S301, a target dimming frequency is determined according to a second brightness threshold.

[0055] In step S302, according to the correspondence between the dimming frequency and the number of pulses per unit time, the number of pulses per unit time corresponding to the target dimming frequency is set as the number of pulses per current unit time.

[0056] In an embodiment of the present disclosure, there is a correspondence between the dimming frequency and the number of pulses per unit time. For example, when the screen refresh rate is 120 Hz, the dimming frequency when the number of pulses per unit time is 1 (EM 1 pulse) is 120 Hz. The present disclosure adjusts the dimming frequency by adjusting the number of pulses per unit time.

[0057] In one example, for a screen with a refresh rate of 120 Hz, at low brightness, the number of pulses per unit time is set to 32 (EM 32 pulses), and at this time the dimming frequency is 3840 Hz; at medium brightness, the number of pulses per unit time is set to 16 (EM 16 pulses), and at this time the dimming frequency is 1920 Hz.

[0058] It can be understood that the change in the dimming frequency will cause a change in the screen display effect (i.e., Gamma accuracy and visual effect). To ensure that other visual effects of the screen remain unchanged when the dimming frequency changes and the screen display brightness changes, the present disclosure needs to finely adjust other display parameters when the dimming frequency changes.

[0059] Figure 5 is a flowchart of a display method shown according to an exemplary embodiment. As Figure 5 shown, the method includes step S401, step S402A, and step S402B.

[0060] In step S401, the current display brightness of the display screen of the electronic device is determined.

[0061] In step S402A, in response to the current display brightness being less than the first brightness threshold and less than the second brightness threshold, the first Gamma value model is used for screen display.

[0062] In step S402B, in response to the current display brightness being less than the first brightness threshold and greater than or equal to the second brightness threshold, the second Gamma value model is used for screen display.

[0063] In the embodiments of the present disclosure, the change in the dimming frequency will cause the change in the number of pulses per unit time, affecting the Gamma accuracy during the PWM dimming process, and further causing the change in the screen visual effect, based on the influence of different numbers of pulses per unit time on the screen display effect. In the setting stage of the screen, the present disclosure performs Gamma fine-tuning (tunning) in different brightness ranges (based on the first brightness threshold and the second brightness threshold), and after completing the Gamma fine-tuning, performs Gamma one-time programmable (OTP) programming through a Gamma one-time programmable (OTP) device, so that different Gamma models are available in different brightness ranges. The Gamma model includes the driving voltage of pixel units at different gray levels. When performing screen dimming, in response to the application processor detecting a change in the brightness range where the current display brightness is located, the application processor controls the display driver chip to adjust the Gamma model used at the current brightness. Through the present disclosure, the Gamma model used is adjusted when the dimming frequency changes, so as to ensure the Gamma accuracy during the PWM dimming process and the consistency of the screen visual effect when the dimming frequency changes and the screen display brightness changes.

[0064] It can be understood that the present disclosure mainly optimizes the PWM dimming in the DC+PWM dimming method, and DC dimming will still be used at high brightness. The following embodiments of the present disclosure further illustrate the display method proposed by the present disclosure.

[0065] Figure 6 is a flowchart of a display method shown according to an exemplary embodiment. As Figure 6 shown, the method includes steps S501 to step S502.

[0066] In step S501, determine the current display brightness of the display screen of the electronic device.

[0067] In step S502, in response to the current display brightness being greater than or equal to the first brightness threshold, use the direct current (DC) dimming method to perform screen dimming on the display screen.

[0068] In the embodiments of the present disclosure, the display driver chip detects the screen display brightness, and DC dimming is used at high display brightness (the current display brightness is greater than or equal to the first brightness threshold). Without the participation of the application processor, only through the control of the display driver chip, the switching of the number of pulses per unit time and the adjustment of the Gamma model are realized. By adjusting the driving power of the pixel unit, the brightness of the pixel unit is adjusted, thereby adjusting the screen display brightness.

[0069] It can be understood that the DC dimming method adjusts the display brightness by uniformly adjusting the brightness of pixel units. There is no situation where the screen turns on and off within a unit time, and there is no stroboscopic problem. Moreover, the DC dimming method does not have a color cast problem at high brightness. In summary, the present disclosure uses the DC dimming method for dimming at high brightness to ensure the display effect of the display screen at high brightness.

[0070] It can be understood that in the display driver chip for adjusting the screen display, only the display brightness node (i.e., the first brightness threshold) for dividing DC dimming and PWM dimming is set, and the display brightness node (i.e., the second brightness threshold) for dividing different dimming frequencies of PWM dimming is not set. It is impossible to adjust the dimming frequency during PWM dimming only relying on the display driver chip. The following embodiments of the present disclosure further illustrate the display method in the present disclosure.

[0071] In one implementation manner of an embodiment of the present disclosure, the electronic device includes an application processor and a display driver chip; the target dimming frequency is determined by the application processor in the following manner: in response to the current display brightness being less than the first brightness threshold and the application processor monitoring that the previous display brightness is less than the second brightness threshold, the application processor determines the first frequency as the target dimming frequency; in response to the current display brightness being less than the first brightness threshold and the application processor monitoring that the previous display brightness is greater than or equal to the second brightness threshold, the application processor determines the first frequency as the target dimming frequency; setting the current dimming frequency according to the target dimming frequency includes: the application processor controls the display driver chip to set the current dimming frequency according to the target dimming frequency.

[0072] In an embodiment of the present disclosure, in the display driver chip for adjusting the screen display, only the display brightness node (i.e., the first brightness threshold) for dividing DC dimming and PWM dimming is set, and the display brightness node (i.e., the second brightness threshold) for dividing different dimming frequencies of PWM dimming is not set. During the screen dimming process, relying on the display driver chip, only the switching between DC dimming and PWM dimming can be achieved, and the adjustment of the dimming frequency during PWM dimming cannot be achieved.

[0073] In an example of the present disclosure, the application processor of the electronic device monitors the screen display brightness, and within the brightness range corresponding to PWM dimming, according to the monitored current display brightness and the second brightness threshold, controls the display driver chip to set the target dimming frequency according to the brightness range where the current display brightness is located (greater than or equal to the second brightness threshold and less than the second brightness threshold). In summary, the present disclosure realizes the adjustment of the dimming frequency during PWM dimming by the application processor detecting the display brightness and controlling the display driver chip.

[0074] Figure 7 It is a schematic diagram of a display method shown according to an exemplary embodiment of the present disclosure. As Figure 7As shown, the present disclosure uses DC+PWM dimming method for dimming. Taking an electronic device with a 120HZ refresh rate as an example, the main devices for display are as follows: including a terminal control body, that is, an application processor. The application processor judges the display brightness node and outputs corresponding execution instructions to the display driver chip. The display brightness (x) [DBV_TH(x)] is the ultra-high frequency switching node, and the display brightness (x+1) DBV_TH(x+1) is the high frequency switching node. The specific process of this method is as follows: The display driver chip internally sets the pulse number switching node within a unit time, that is, the display brightness (n+1) [DBV_TH(n+1)] is the DC node, and the display brightness (n) [DBV_TH(n)] is the PWM node. During the gamma one-time burning of OTP, when the application processor judges that the display brightness (x+1) ≤ the display brightness, gamma fine-tuning (tuning) is automatically performed. When the display brightness ≤ the display brightness (x), the application processor sends an instruction to switch the pulse number within a unit time to the display driver chip to change the pulse number setting within the switched unit time of the current display brightness (n), that is, the pulse number within a unit time 16 (16pulse) → the pulse number within a unit time 32 (32pulse). Then gamma fine-tuning is performed to achieve the gamma fine-tuning result in the interval from the lowest display brightness to the display brightness (x) (when EM pulse is 32pulse, that is, the pulse number switched within a unit time is 32), and then gamma one-time burning of the full display brightness is performed. The application process of the display terminal is provided as follows: The application processor provides the execution instruction of the display driver chip by judging the display brightness to change the pulse number within a unit time in the corresponding display brightness interval, and ensures the gamma accuracy and visual effect under this dimming PWM. Specifically, the display terminal reports the current display brightness node, and the application processor judges the size relationship between the display brightness node, the display brightness (x), and the display brightness. When the display brightness_TH(x+1) ≤ the display brightness, the application processor issues an order to the display driver chip to switch the pulse number within a unit time to 16. When the display brightness ≤ the display brightness (x), the application processor issues an order to the display driver chip to switch the pulse number within a unit time to 32, realizing ultra-high frequency (3840Hz) PWM at low brightness and high frequency (1920Hz) PWM at medium brightness.

[0075] Figure 8 is a schematic diagram of a display method shown according to another exemplary embodiment of the present disclosure. As Figure 8 shown, based on the above Figure 7The device in the present disclosure also provides a solution process for the flickering during the sliding of the brightness bar of a display terminal, and the specific process is as follows: When the display terminal slides the display brightness (DBV) bar, it reports the current display brightness value to the application processor. After the application processor obtains the display brightness information, it determines whether the display brightness node at the sliding starting point crosses the display brightness (x) [DBV_TH(x)] and the display brightness (n + 1) [DBV_TH(n + 1)], that is, the AP judges the target DBV node. If the judgment is "No (N)", it directly adjusts the brightness step by step to the target display brightness according to the normal dimming process. If the judgment is "Yes (Y)", the subsequent judgment process is executed. When the application processor judges that the target display brightness node ≤ the display brightness (x) [DBV ≤ DBV_TH(x)], it adjusts the brightness step by step to the display brightness (x + 1) [DBV_TH(x + 1)], then the application processor switches the number of pulses per unit time to 32 [AP switches the EM pulse to be set to 32 pulses], then switches the display brightness to the display brightness_TH(x), and finally adjusts the display brightness step by step to the target brightness; when the application processor judges that the target display brightness node ≥ the display brightness (x + 1) [DBV ≤ DBV_TH(x + 1)], it adjusts the brightness step by step to the display brightness_TH(x), then the application processor sends a command to the display control chip to switch the number of pulses per unit time to 16 [AP switches the EM pulse to be set to 16 pulses], then switches the display brightness to the display brightness (x + 1), and finally adjusts the display brightness step by step to the target brightness.

[0076] In an embodiment of the present disclosure, when dimming the display screen of an electronic device, the current display brightness of the electronic device is determined. When the current display brightness is less than the first brightness threshold, PWM dimming is performed. The current display brightness of the electronic device is determined by the application processor. When the current display brightness is less than the second brightness threshold, a higher target dimming frequency is determined, and the current dimming frequency is set according to the target dimming frequency, and the pulse width modulation PWM dimming method is used to perform screen dimming on the display screen. When the current display brightness is greater than or equal to the second brightness threshold (the second brightness threshold is greater than the first brightness threshold), a lower target dimming frequency is determined, and the current dimming frequency is set according to the lower target dimming frequency, and the pulse width modulation PWM dimming method is used to perform screen dimming on the display screen. Through the present disclosure, when using the pulse width modulation PWM dimming method to dim the display screen, two brightness ranges are set according to the preset brightness thresholds, and in different brightness ranges, different dimming frequencies are used to dim the display screen through the pulse width modulation PWM dimming method, effectively improving the low-brightness flickering problem and achieving the purpose of protecting eyesight during display while ensuring the battery life of the electronic device.

[0077] Based on the same concept, an embodiment of the present disclosure also provides a display device 100.

[0078] It can be understood that in order for the display device 100 provided by the embodiment of the present disclosure to achieve the above functions, it includes the corresponding hardware structures and / or software modules for executing each function. Combining the units and algorithm steps of the various examples disclosed in the embodiments of the present disclosure, the embodiments of the present disclosure can be implemented in the form of hardware or a combination of hardware and computer software. Whether a certain function is executed in the manner of hardware or computer software driving hardware depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods for each specific application to implement the described function, but such implementation should not be considered to exceed the scope of the technical solution of the embodiments of the present disclosure.

[0079] Figure 9 is a block diagram of a display device 100 shown according to an exemplary embodiment. Refer to Figure 9 , the device includes a determination unit 101, a processing unit 102, and an adjustment unit 103.

[0080] The determination unit 101 is used to determine the current display brightness of the display screen of the electronic device.

[0081] The processing unit 102 is configured to, in response to the current display brightness being less than the first brightness threshold and the current display brightness being less than the second brightness threshold, determine the first frequency as the target dimming frequency.

[0082] Wherein, the first brightness threshold is used to control the switching between the pulse width modulation (PWM) dimming method and the direct current (DC) dimming method, and the first brightness threshold is greater than the second brightness threshold, and the first frequency is higher than the preset frequency threshold.

[0083] The adjustment unit 103 is used to set the current dimming frequency according to the target dimming frequency, and perform screen dimming on the display screen using the pulse width modulation (PWM) dimming method according to the current dimming frequency.

[0084] In one implementation manner, the processing unit 102 is further configured to: in response to the current display brightness being less than the first brightness threshold and the current display brightness being greater than or equal to the second brightness threshold, determine the second frequency as the target dimming frequency, and the second frequency is lower than the preset frequency threshold.

[0085] In one implementation manner, there is a corresponding relationship between the dimming frequency of the PWM dimming method and the number of pulses per unit time. The adjustment unit 103 sets the current dimming frequency according to the target dimming frequency in the following manner, including: according to the corresponding relationship between the dimming frequency and the number of pulses per unit time, setting the number of pulses per unit time corresponding to the target dimming frequency as the number of pulses per unit time currently.

[0086] In one implementation, the adjustment unit 103 is further configured to: in response to the current display brightness being less than the first brightness threshold and the current display brightness being less than the second brightness threshold, use the first Gamma value model for screen display. In response to the current display brightness being less than the first brightness threshold and the current display brightness being greater than or equal to the second brightness threshold, use the second Gamma value model for screen display. The first Gamma value model is different from the second Gamma value model. The first Gamma value model and the second Gamma value model are used to determine the driving voltage of the pixel units of the display screen at different gray levels.

[0087] In one implementation, the adjustment unit 103 is further configured to: in response to the current display brightness being greater than or equal to the first brightness threshold, use the direct current (DC) dimming method to perform screen dimming on the display screen.

[0088] In one implementation, the electronic device includes an application processor and a display driver chip. The target dimming frequency is determined by the application processor in the following manner: in response to the current display brightness being less than the first brightness threshold and the application processor monitoring that the previous display brightness is less than the second brightness threshold, the application processor determines the first frequency as the target dimming frequency. In response to the current display brightness being less than the first brightness threshold and the application processor monitoring that the previous display brightness is greater than or equal to the second brightness threshold, the application processor determines the first frequency as the target dimming frequency. The adjustment unit 103 sets the current dimming frequency according to the target dimming frequency in the following manner: the application processor controls the display driver chip to set the current dimming frequency according to the target dimming frequency.

[0089] Regarding the device in the above embodiments, the specific manner in which each module performs operations has been described in detail in the embodiments related to the method, and will not be elaborated here.

[0090] Figure 10 FIG. 200 is a block diagram of a display device 200 shown according to an exemplary embodiment. The device 200 may be provided as a terminal. For example, the device 200 may be a mobile phone, a computer, a digital broadcast terminal, a messaging device, a game console, a tablet device, a medical device, a fitness device, a personal digital assistant, etc.

[0091] Refer to Figure 10 , the device 200 may include one or more of the following components: a processing component 202, a memory 204, a power component 206, a multimedia component 208, an audio component 210, an input / output (I / O) interface 212, a sensor component 214, and a communication component 216.

[0092] The processing component 202 generally controls the overall operation of the device 200, such as operations associated with display, telephone calls, data communication, camera operations, and recording operations. The processing component 202 may include one or more processors 220 to execute instructions to complete all or part of the steps of the above-described methods. In addition, the processing component 202 may include one or more modules to facilitate the interaction between the processing component 202 and other components. For example, the processing component 202 may include a multimedia module to facilitate the interaction between the multimedia component 208 and the processing component 202.

[0093] The memory 204 is configured to store various types of data to support the operation of the device 200. Examples of such data include instructions for any application or method operating on the device 200, contact data, phone book data, messages, pictures, videos, etc. The memory 204 may be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, magnetic disk, or optical disk.

[0094] The power component 206 provides power to the various components of the device 200. The power component 206 may include a power management system, one or more power supplies, and other components associated with generating, managing, and distributing power for the device 200.

[0095] The multimedia component 208 includes a screen that provides an output interface between the device 200 and the user. In some embodiments, the screen may include a liquid crystal display (LCD) and a touch panel (TP). If the screen includes a touch panel, the screen may be implemented as a touch screen to receive input signals from the user. The touch panel includes one or more touch sensors to sense touches, swipes, and gestures on the touch panel. The touch sensors may sense not only the boundaries of the touch or swipe actions but also detect the duration and pressure associated with the touch or swipe operations. In some embodiments, the multimedia component 208 includes a front camera and / or a rear camera. When the device 200 is in an operating mode, such as a shooting mode or a video mode, the front camera and / or the rear camera may receive external multimedia data. Each of the front camera and the rear camera may be a fixed optical lens system or have focal length and optical zoom capabilities.

[0096] The audio component 210 is configured to output and / or input audio signals. For example, the audio component 210 includes a microphone (MIC) that is configured to receive external audio signals when the device 200 is in an operating mode, such as a call mode, a recording mode, and a voice recognition mode. The received audio signals can be further stored in the memory 204 or transmitted via the communication component 216. In some embodiments, the audio component 210 further includes a speaker for outputting audio signals.

[0097] The I / O interface 212 provides an interface between the processing component 202 and a peripheral interface module, and the peripheral interface module may be a keyboard, a click wheel, buttons, etc. These buttons may include, but are not limited to: a home button, a volume button, a power button, and a lock button.

[0098] The sensor component 214 includes one or more sensors for providing an assessment of various aspects of the state of the device 200. For example, the sensor component 214 can detect the on / off state of the device 200, the relative positioning of components, such as the display and keypad of the device 200. The sensor component 214 can also detect a change in the position of the device 200 or a component of the device 200, the presence or absence of user contact with the device 200, the orientation or acceleration / deceleration of the device 200, and a change in the temperature of the device 200. The sensor component 214 can include a proximity sensor configured to detect the presence of nearby objects without any physical contact. The sensor component 214 can also include a light sensor, such as a CMOS or CCD image sensor, for use in imaging applications. In some embodiments, the sensor component 214 can further include an acceleration sensor, a gyro sensor, a magnetic sensor, a pressure sensor, or a temperature sensor.

[0099] The communication component 216 is configured to facilitate communication between the device 200 and other devices in a wired or wireless manner. The device 200 can access a wireless network based on communication standards, such as WiFi, 2G, or 3G, or a combination thereof. In an exemplary embodiment, the communication component 216 receives broadcast signals or broadcast-related information from an external broadcast management system via a broadcast channel. In an exemplary embodiment, the communication component 216 further includes a near field communication (NFC) module to facilitate short-range communication. For example, the NFC module can be implemented based on radio frequency identification (RFID) technology, infrared data association (IrDA) technology, ultra-wideband (UWB) technology, Bluetooth (BT) technology, and other technologies.

[0100] In an exemplary embodiment, the apparatus 200 may be implemented by one or more application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field programmable gate arrays (FPGAs), controllers, microcontrollers, microprocessors, or other electronic components for performing the above method.

[0101] In an exemplary embodiment, a non-transitory computer-readable storage medium including instructions is also provided, such as the memory 204 including instructions, and the above instructions can be executed by the processor 220 of the apparatus 200 to complete the above method. For example, the non-transitory computer-readable storage medium may be a ROM, a random access memory (RAM), a CD-ROM, a magnetic tape, a floppy disk, and an optical data storage device, etc.

[0102] It can be understood that "a plurality of" in the present disclosure means two or more, and other quantifiers are similar thereto. "And / or" describes the association relationship of associated objects and indicates that three relationships may exist. For example, A and / or B may represent: A exists alone, A and B exist simultaneously, and B exists alone. The character " / " generally represents an "or" relationship between the associated objects before and after. The singular forms of "a", "the", and "said" are also intended to include the plural forms unless the context clearly indicates otherwise.

[0103] Furthermore, it can be understood that the terms "first", "second", etc. are used to describe various information, but this information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other and do not represent a specific order or importance. In fact, the expressions such as "first" and "second" can be used interchangeably. For example, without departing from the scope of the present disclosure, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information.

[0104] Furthermore, it can be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "front", "rear", "up", "down", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing this embodiment and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation.

[0105] Furthermore, it can be understood that unless otherwise specified, "connection" includes direct connection without other components between the two, and also includes indirect connection with other elements between the two.

[0106] It can be further understood that although operations are described in a specific order in the drawings in the embodiments of the present disclosure, it should not be construed as requiring these operations to be performed in the specific order shown or in a serial order, or requiring all the operations shown to obtain the desired result. In certain environments, multitasking and parallel processing may be advantageous.

[0107] Those skilled in the art will readily conceive of other embodiments of the present disclosure after considering the specification and practicing the invention disclosed herein. The present disclosure is intended to cover any variations, uses, or adaptations of the present solution, which follow the general principles of the present disclosure and include known common general knowledge or conventional technical means in the technical field not disclosed by the present disclosure.

[0108] It should be understood that the present disclosure is not limited to the exact structures described above and shown in the drawings, and various modifications and changes can be made without departing from its scope. The scope of the present disclosure is only limited by the appended claims.

Claims

1. A display method, characterized in that, comprising: Determine the current display brightness of the display screen of the electronic device; In response to the current display brightness being less than the first brightness threshold and the current display brightness being less than the second brightness threshold, determine the first frequency as the target dimming frequency; The first brightness threshold is used to control the switching between pulse width modulation (PWM) dimming mode and direct current (DC) dimming mode, and the first brightness threshold is greater than the second brightness threshold, and the first frequency is higher than the preset frequency threshold; Set the current dimming frequency according to the target dimming frequency, and perform screen dimming on the display screen using the pulse width modulation (PWM) dimming mode according to the current dimming frequency.

2. The method according to claim 1, characterized in that, the method further comprises: In response to the current display brightness being less than the first brightness threshold and the current display brightness being greater than or equal to the second brightness threshold, determine the second frequency as the target dimming frequency, and the second frequency is lower than the preset frequency threshold.

3. The method according to any one of claims 1 or 2, characterized in that, There is a corresponding relationship between the dimming frequency of the PWM dimming mode and the number of pulses per unit time; The setting of the current dimming frequency according to the target dimming frequency includes: According to the corresponding relationship between the dimming frequency and the number of pulses per unit time, set the number of pulses per unit time corresponding to the target dimming frequency as the number of pulses per unit time of the current.

4. The method according to claim 1, characterized in that, the method further comprises: In response to the current display brightness being less than the first brightness threshold and the current display brightness being less than the second brightness threshold, use the first Gamma value model for screen display; In response to the current display brightness being less than the first brightness threshold and the current display brightness being greater than or equal to the second brightness threshold, use the second Gamma value model for screen display; The first Gamma value model is different from the second Gamma value model; The first Gamma value model and the second Gamma value model are used to determine the driving voltage of the pixel unit of the display screen at different gray levels.

5. The method according to claim 1, characterized in that, the method further comprises: In response to the current display brightness being greater than or equal to the first brightness threshold, perform screen dimming on the display screen using the direct current (DC) dimming mode.

6. The method according to any one of claims 1 or 2, characterized in that, the electronic device includes an application processor and a display driver chip; The target dimming frequency is determined by the application processor in the following manner: In response to the current display brightness being less than the first brightness threshold and the application processor monitoring that the previous display brightness is less than the second brightness threshold, determine the first frequency as the target dimming frequency through the application processor; In response to the current display brightness being less than the first brightness threshold and the application processor monitoring that the previous display brightness is greater than or equal to the second brightness threshold, determine the first frequency as the target dimming frequency through the application processor; Setting the current dimming frequency according to the target dimming frequency includes: Controlling, by the application processor according to the target dimming frequency, the display driving chip to set the current dimming frequency.

7. A display device, characterized in that it includes: a determination unit configured to determine the current display brightness of the display screen of the electronic device; a processing unit configured to, in response to the current display brightness being less than a first brightness threshold and the current display brightness being less than a second brightness threshold, determine a first frequency as the target dimming frequency; the first brightness threshold is used to control the switching between pulse width modulation (PWM) dimming mode and direct current (DC) dimming mode, and the first brightness threshold is greater than the second brightness threshold, and the first frequency is higher than a preset frequency threshold; an adjustment unit configured to set the current dimming frequency according to the target dimming frequency, and perform screen dimming on the display screen using the pulse width modulation (PWM) dimming mode according to the current dimming frequency.

8. The device according to claim 7, characterized in that the processing unit is further configured to: in response to the current display brightness being less than the first brightness threshold and the current display brightness being greater than or equal to the second brightness threshold, determine a second frequency as the target dimming frequency, and the second frequency is lower than the preset frequency threshold.

9. The device according to any one of claims 7 or 8, characterized in that there is a corresponding relationship between the dimming frequency of the PWM dimming mode and the number of pulses per unit time, and the adjustment unit sets the current dimming frequency according to the target dimming frequency in the following manner, including: According to the corresponding relationship between the dimming frequency and the number of pulses per unit time, setting the number of pulses per unit time corresponding to the target dimming frequency as the number of pulses per unit time currently.

10. The device according to claim 7, characterized in that the adjustment unit is further configured to: in response to the current display brightness being less than the first brightness threshold and the current display brightness being less than the second brightness threshold, perform screen display using a first Gamma value model; in response to the current display brightness being less than the first brightness threshold and the current display brightness being greater than or equal to the second brightness threshold, perform screen display using a second Gamma value model; the first Gamma value model is different from the second Gamma value model; the first Gamma value model and the second Gamma value model are used to determine the driving voltage of the pixel unit of the display screen at different gray levels.

11. The device according to claim 7, characterized in that the adjustment unit is further configured to: in response to the current display brightness being greater than or equal to the first brightness threshold, perform screen dimming on the display screen using the direct current (DC) dimming mode.

12. The device according to any one of claims 7 or 8, characterized in that the electronic device includes an application processor and a display driving chip; the target dimming frequency is determined by the application processor in the following manner: In response to the current display brightness being less than the first brightness threshold and the application processor detecting that the previous display brightness is less than the second brightness threshold, determine the first frequency as the target dimming frequency through the application processor; In response to the current display brightness being less than the first brightness threshold and the application processor detecting that the previous display brightness is greater than or equal to the second brightness threshold, determine the first frequency as the target dimming frequency through the application processor; The adjustment unit sets the current dimming frequency according to the target dimming frequency in the following manner: Control the display driver chip to set the current dimming frequency according to the target dimming frequency through the application processor.

13. A display device, Characterized in that, Comprising: A processor: A memory for storing instructions executable by the processor; Wherein, the processor is configured to: execute the display method according to any one of claims 1 to 6.

14. A storage medium, Characterized in that, Instructions are stored in the storage medium, and when the instructions in the storage medium are executed by the processor, the processor can execute the display method according to any one of claims 1 to 6.

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