A high-frequency display screen modulation method, device, electronic device and storage medium

Abstract

The present application provides a high-frequency display screen modulation method, device, electronic device and storage medium, which relates to the field of display control technology. The method includes: selecting a target color light that meets the screening rules from the three primary colors according to the afterglow time of each color light under the target backlight intensity and the single cycle time corresponding to the signal frequency of the backlight modulation signal, the single cycle time is the duration of a single cycle in the backlight modulation signal, and the target backlight intensity is the intensity of the backlight generated by the backlight modulation signal with a full duty cycle; using the afterglow intensity curve of the target color light, determining the energy to be attenuated corresponding to the target color light at the current brightness; using the energy to be attenuated to modulate the target color light so that the color displayed on the modulated display screen meets the color requirements. By adopting the above-mentioned high-frequency display screen modulation method, device, electronic device and storage medium, the problem of low accuracy of color display in the display screen when performing high-frequency PWM dimming is solved.

Description

Technical Field

[0001] The present application relates to the field of display control technology, and in particular to a high-frequency display screen modulation method, device, electronic device and storage medium. Background Art

[0002] As the living standards of residents continue to improve, more and more electronic devices have entered people's daily lives. However, the display screen itself has a fluorescent afterglow effect, which is caused by the excitation of the phosphor of the display screen itself, and the intensity of the afterglow effect is related to the pulse width modulation (PWM) frequency of the display screen.

[0003] When the PWM frequency is low, the afterglow effect is weak and will not significantly affect the display effect of the display. However, when the PWM frequency is very high, for example, above 5000HZ or even above 10000HZ, the afterglow effect will be amplified due to frequent changes in light and dark, and the degree of afterglow effect caused by different colors of light is also different. All of these lead to the problem of low accuracy of color display in the display when high-frequency PWM dimming is used. Summary of the invention

[0004] In view of this, the purpose of the present application is to provide a high-frequency display screen modulation method, device, electronic device and storage medium to solve the problem of low accuracy of color display in a display screen during high-frequency PWM dimming.

[0005] In a first aspect, an embodiment of the present application provides a high-frequency display screen modulation method, comprising:

[0006] According to the afterglow time of each color light under the target backlight intensity and the single cycle time corresponding to the signal frequency of the backlight modulation signal, the target color light that meets the screening rules is selected from the three primary colors. The single cycle time is the duration of a single cycle in the backlight modulation signal, and the target backlight intensity is the intensity of the backlight generated by the backlight modulation signal with a full duty cycle;

[0007] Using the afterglow intensity curve of the target color light, determine the energy to be attenuated corresponding to the target color light at the current brightness;

[0008] The target color light is modulated using the energy to be attenuated so that the color displayed on the display screen after modulation meets the color requirements.

[0009] Optionally, the target color light is modulated using the energy to be attenuated, including: determining a target transmittance of a liquid crystal layer in a display screen according to the energy to be attenuated; and using the target transmittance to attenuate the brightness of the target color light passing through the liquid crystal layer, so that the brightness of the modulated target color light conforms to a Gamma curve.

[0010] Optionally, based on the afterglow time of each color light under the target backlight intensity and the single cycle time corresponding to the signal frequency of the backlight modulation signal, a target color light that meets the screening rules is selected from the three primary colors of light, including: for each color light, determining the ratio of the afterglow time corresponding to the color light to the single cycle time; and selecting the color light whose ratio is greater than a set threshold as the target color light.

[0011] Optionally, the afterglow intensity curve of the target color light is used to determine the energy to be attenuated corresponding to the target color light at the current brightness, including: determining the single-cycle afterglow energy according to the afterglow intensity curve; determining the energy to be attenuated corresponding to the target color light according to the single-cycle afterglow energy and the proportional relationship between the backlight modulation cycle and the liquid crystal adjustment cycle.

[0012] Optionally, determining the single-cycle afterglow energy according to the afterglow intensity curve includes: integrating the light intensity in the target afterglow time interval in the afterglow intensity curve to obtain the single-cycle afterglow energy.

[0013] Optionally, the energy to be attenuated corresponding to the target color light is determined according to the proportional relationship between the single-cycle afterglow energy and the backlight modulation cycle and the liquid crystal adjustment cycle, including: determining the energy amplification coefficient according to the proportional relationship between the backlight modulation cycle and the liquid crystal adjustment cycle; and determining the product of the single-cycle afterglow energy and the energy amplification coefficient as the energy to be attenuated.

[0014] Optionally, the method further includes: constructing an afterglow intensity curve according to the afterglow time of the target color light and the light intensity at different times within the afterglow time, wherein the afterglow intensity curve is used to characterize the change of afterglow light intensity over time.

[0015] Optionally, the light intensity within the target afterglow time interval in the afterglow intensity curve is integrated to obtain the single-cycle afterglow energy, including: determining whether the sum of the afterglow time and the duty cycle time within a single modulation cycle at the current brightness is greater than the single cycle time, the duty cycle time being the duration corresponding to the high level within the single modulation cycle; if it is greater than the single cycle time, then taking the afterglow time within the single modulation cycle as the target afterglow time interval to integrate the light intensity within the target afterglow time interval; if it is less than or equal to the single cycle time, then taking the afterglow time as the target afterglow time interval to integrate the light intensity within the target afterglow time interval.

[0016] Optionally, the gamma curve has a minimum brightness, and the magnitude of the minimum brightness is determined by the magnitude of the signal frequency.

[0017] In a second aspect, an embodiment of the present application further provides a high-frequency display screen modulation device, the device comprising:

[0018] A color light selection module is used to select a target color light that meets the screening rules from the three primary colors according to the afterglow time of each color light under the target backlight intensity and the single cycle time corresponding to the signal frequency of the backlight modulation signal. The single cycle time is the duration of a single cycle in the backlight modulation signal, and the target backlight intensity is the intensity of the backlight generated by the backlight modulation signal with a full duty cycle;

[0019] An energy determination module, used to determine the energy to be attenuated corresponding to the target color light at the current brightness by using the afterglow intensity curve of the target color light;

[0020] The color modulation module is used to modulate the target color light using the energy to be attenuated so that the color displayed on the display screen after modulation meets the color requirements.

[0021] In a third aspect, an embodiment of the present application further provides an electronic device, comprising: a processor, a memory and a bus, wherein the memory stores machine-readable instructions executable by the processor, and when the electronic device is running, the processor and the memory communicate through the bus, and when the machine-readable instructions are executed by the processor, the steps of the high-frequency display screen modulation method as described above are performed.

[0022] In a fourth aspect, an embodiment of the present application further provides a computer-readable storage medium, on which a computer program is stored, and when the computer program is executed by a processor, the steps of the high-frequency display screen modulation method as described above are executed.

[0023] The embodiments of the present application bring the following beneficial effects:

[0024] A high-frequency display screen modulation method, device, electronic device and storage medium provided in the embodiments of the present application can select the target color light to be modulated in the display screen according to the afterglow time corresponding to each color light and the single cycle time of the backlight modulation signal. When the brightness of the display screen changes, the afterglow intensity curve of the target color light can be used to determine the additional energy corresponding to the afterglow effect currently generated by the target color light under the high-frequency modulation signal, and the additional energy generated by the afterglow effect is removed through modulation processing, thereby reducing the influence of the afterglow effect on the display effect under the high-frequency modulation signal. Compared with the display screen modulation method in the prior art, the problem of low accuracy of color display in the display screen during high-frequency PWM dimming is solved.

[0025] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, preferred embodiments are specifically cited below and described in detail with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0027] Figure 1 A flow chart of a high-frequency display screen modulation method provided in an embodiment of the present application is shown;

[0028] Figure 2 A schematic diagram showing the structure of a high-frequency display screen modulation device provided in an embodiment of the present application is shown;

[0029] Figure 3 A schematic diagram of the structure of an electronic device provided in an embodiment of the present application is shown. DETAILED DESCRIPTION

[0030] To make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. The components of the embodiments of the present application usually described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the application claimed for protection, but merely represents the selected embodiments of the present application. Based on the embodiments of the present application, each other embodiment obtained by those skilled in the art without making creative work belongs to the scope of protection of the present application.

[0031] It is worth noting that before the present application was filed, with the continuous improvement of residents' living standards, more and more electronic devices entered people's daily lives. However, the display screen itself has a fluorescent afterglow effect, which is caused by the excitation of the fluorescent powder of the display screen itself, and the strength of the afterglow effect is related to the pulse width modulation (PWM) frequency of the display screen. When the PWM frequency is low, the afterglow effect is weak and will not have a significant impact on the display effect of the display screen. However, when the PWM frequency is very high, for example: above 5000HZ, or even above 10000HZ, the proportion of afterglow time will increase, especially in low brightness conditions, the brightness will be more affected. At this time, the afterglow effect will be amplified due to frequent changes in light and dark, and the degree of afterglow effect caused by different colors of light is also different. These all lead to the problem of low accuracy of color display of the display screen during high-frequency PWM dimming.

[0032] Based on this, an embodiment of the present application provides a high-frequency display screen modulation method to improve the accuracy of color display in the display screen during high-frequency PWM dimming.

[0033] The terms involved in the embodiments of the present application are explained below.

[0034] PWM duty cycle: refers to the ratio of the duration of the high level to the entire cycle time in a PWM signal. PWM is a technology that controls the average power or amplitude of the output signal by adjusting the width and period of the pulse signal. The duty cycle is usually expressed as a percentage. For example, if the cycle of a PWM signal is 10ms and the high level duration is 5ms, then the duty cycle of the PWM signal is 50%.

[0035] Afterglow time: Afterglow time is the time that light emission continues after excitation stops. Less than 1 microsecond is called "ultra-short afterglow"; 1 to 10 microseconds is called "short afterglow"; 10 microseconds to 1 millisecond is called "medium-short afterglow"; 1 to 100 milliseconds is called "medium afterglow".

[0036] See also Figure 1 , Figure 1 This is a flow chart of a high-frequency display screen modulation method provided in an embodiment of the present application. Figure 1 As shown, the high-frequency display screen modulation method provided in the embodiment of the present application includes:

[0037] Step S101 , selecting a target color light that meets a screening rule from the three primary colors according to the afterglow time of each color light at a target backlight intensity and a single cycle time corresponding to the signal frequency of a backlight modulation signal.

[0038] In this step, the three primary colors of light include: red light, green light, and blue light. The target color light is a color of the three primary colors of light.

[0039] The single cycle time is the duration of a single modulation cycle in the backlight modulation signal. For example, the backlight modulation signal is a PWM signal. Taking the signal frequency as 10000HZ, since the number of cycles from high level to low level and then back to high level in 1 second is 10000 times, the single cycle time is Second.

[0040] The target backlight intensity is the intensity of the backlight generated by the backlight modulation signal with a full duty cycle, that is, the intensity of the backlight generated when the PWM signal is at a full duty cycle (100% high level).

[0041] The screening rule may refer to a rule for screening out the afterglow time of the outstanding light being greater than a set time period.

[0042] In an embodiment of the present application, the high-frequency backlight modulation signal is a PWM signal with a frequency greater than 5000HZ, and the display screen is an LED or LCD display screen. Since not all the colors in the three primary colors will cause a significant afterglow effect under high-frequency PWM dimming, it is necessary to select the target color light that can produce a significant afterglow effect at the current frequency from the three primary colors, so as to perform targeted modulation processing on the target color light. To this end, it is necessary to first determine the signal frequency of the backlight modulation signal and the afterglow time of each color light at the target backlight intensity. Among them, the signal frequency can be obtained by measurement, or directly obtained through the device information of the display screen, and the afterglow time can be obtained by detecting the afterglow time of each color light at the target backlight intensity through the detection device.

[0043] After determining the signal frequency and the afterglow time of each color light, the ratio of the afterglow time corresponding to the color light to the single cycle time can be determined for each color light. For example, the single cycle time is seconds, and the afterglow time of red light is seconds, and the afterglow time of blue light is seconds, then the ratio corresponding to red light is = 0.1, the ratio corresponding to blue light is = 0.001. Then, the color light whose ratio is greater than the set threshold is selected as the target color light. Assuming that the set threshold is 0.0012, since the ratio corresponding to the blue light is less than the set threshold, the red light is selected as the target color light. Those skilled in the art can select the specific value of the set threshold according to actual conditions, and this application does not limit it here.

[0044] Step S102, using the afterglow intensity curve of the target color light, determining the energy to be attenuated corresponding to the target color light at the current brightness.

[0045] In this step, the afterglow intensity curve is used to characterize the change of afterglow light intensity over time. The abscissa of the afterglow intensity curve is time, and the ordinate of the afterglow intensity curve is light intensity.

[0046] The energy to be attenuated may refer to the light energy that needs to be attenuated under the target color light.

[0047] In the embodiment of the present application, the color displayed on the display screen is formed by the light emitted by the backlight source passing through the lower polarizer, TFT substrate, liquid crystal layer, color filter and upper polarizer in sequence and observed by the human eye, wherein the natural light emitted by the backlight first passes through the lower polarizer 9 to become linear polarization, and the linear polarization is transmitted to the color film through the twisting of the liquid crystal molecules, and is converted into red, green and blue primary colors (also called three primary colors) through the color film. The red, green and blue can obtain various colors required for actual display by mixing different brightness ratios. The gratings of the lower polarizer and the upper polarizer are perpendicular to each other. Through the flipping of the liquid crystal, the amount of light passing through the upper polarizer at different flipping angles is different. The more the amount, the greater the brightness, and the less the amount, the smaller the brightness, thereby controlling different brightness. In a low-frequency display screen, since the PWM frequency is low, no significant afterglow effect will be produced. However, when the PWM frequency is high, for example: greater than 5000HZ, the light emitted by the display screen will cause an afterglow effect, causing the color displayed on the display screen to have color difference, resulting in the problem of inaccurate color display. However, not all colors of the three primary colors produce significant afterglow effects. Therefore, it is necessary to screen out target colors with significant afterglow effects and determine the amount of energy that the target colors need to attenuate.

[0048] The target color light can be one or more. After determining the target color light, it is necessary to establish the afterglow intensity curve corresponding to each target color light according to the light intensity of each color light detected by the detection equipment. The afterglow intensity curve describes the process of light intensity change during the afterglow time. The light intensity of the target color light will gradually decay to 0 during the corresponding afterglow time. Since the characteristics of different color lights are different, the attenuation process of different color lights is different, resulting in different afterglow intensity curves corresponding to different color lights. If the target color light is only red, then establish an afterglow intensity curve corresponding to red light. If the target color light is red and green, then establish an afterglow intensity curve corresponding to red light and an afterglow intensity curve corresponding to green light respectively.

[0049] Here, an afterglow intensity curve can be constructed based on the afterglow time of the target color light and the light intensity at different times during the afterglow time. That is, for each color light, the duration of the light emission after the excitation stops is determined through experiments, and the light intensity at each moment during the duration of the light emission is recorded to generate an afterglow intensity curve.

[0050] After constructing the afterglow intensity curve corresponding to each target color light, the afterglow intensity curve of the target color light can be used to determine the energy to be attenuated corresponding to the target color light at the current brightness. Specifically, the single-cycle afterglow energy can be determined according to the afterglow intensity curve, and then the energy to be attenuated corresponding to the target color light can be determined according to the single-cycle afterglow energy and the proportional relationship between the backlight modulation cycle and the liquid crystal adjustment cycle. Here, since the adjustment cycle of the liquid crystal layer in the display screen is fixed, and the liquid crystal adjustment cycle is different from the modulation cycle of the backlight modulation signal, and since the time of these two cycles is very short, the human eye cannot recognize the time difference between the two cycles. Therefore, the proportional relationship between multiple backlight modulation cycles and one liquid crystal adjustment cycle can be determined, so that the sum of the energy to be attenuated corresponding to multiple backlight modulation cycles can be attenuated together within one liquid crystal adjustment cycle according to the proportional relationship.

[0051] Here, the liquid crystal adjustment cycle is determined by the liquid crystal refresh rate. Taking the liquid crystal adjustment cycle as 100 Hz and the signal frequency of the backlight modulation signal as 10000 Hz as an example, 100 backlight modulation cycles are equal to 1 liquid crystal adjustment cycle. Therefore, it can be determined that the ratio between the backlight modulation cycle and the liquid crystal adjustment cycle is 100. In this way, the energy to be attenuated corresponding to the target color light can be determined based on the single-cycle afterglow energy and the ratio of 100.

[0052] In one example, the single-cycle afterglow energy can be determined by integrating the light intensity in the target afterglow time interval in the afterglow intensity curve to obtain the single-cycle afterglow energy. Here, when performing the light intensity integration, it can be determined whether the sum of the afterglow time and the duty cycle time in a single modulation cycle at the current brightness is greater than the single cycle time, where the duty cycle time is the duration corresponding to the high level in a single modulation cycle. For example, the single cycle duration corresponding to a single modulation cycle is seconds, the duty cycle time is seconds, and the afterglow time is Second.

[0053] If it is greater than the single cycle time, it means that the afterglow time exceeds the duration of a single backlight modulation cycle. The afterglow time that exceeds a single modulation cycle is not considered, so the afterglow time within a single modulation cycle is taken as the target afterglow time interval to integrate the light intensity within the target afterglow time interval. Taking the above example, the afterglow time is seconds, the afterglow time beyond a single backlight modulation cycle is seconds, so the duration of the target afterglow time interval is Second.

[0054] If it is less than or equal to the single cycle time, it means that the afterglow time does not exceed the duration of a single modulation cycle, and the energy within the entire afterglow time needs to be modulated. The afterglow time is used as the target afterglow time interval to integrate the light intensity within the target afterglow time interval.

[0055] After determining the single-cycle afterglow energy, the energy amplification coefficient can be determined according to the proportional relationship between the backlight modulation period and the liquid crystal adjustment period, and the product of the single-cycle afterglow energy and the energy amplification coefficient is determined as the energy to be attenuated. Taking the above example as an example, the proportional relationship value 100 can be directly used as the energy amplification coefficient, and finally, the result of the single-cycle afterglow energy × 100 is determined as the energy to be attenuated.

[0056] It should be noted that the current brightness is the fixed brightness obtained after the user manually adjusts the display screen. For example, the maximum brightness of the display screen is 100, and the current brightness after manual adjustment by the user is 70. At the current brightness of 70, the afterglow time of each modulation cycle is the same, that is, the energy to be attenuated corresponding to each modulation cycle is the same. In this way, the total energy to be attenuated in 100 modulation cycles can be represented by the product of the single-cycle afterglow energy and the energy amplification coefficient, so that this part of the total energy can be attenuated at one time when the adjustment cycle of the liquid crystal layer comes, so as to adjust the color display effect in the display screen. In addition, the current brightness refers to the brightness of the backlight. Different backlight brightness will change the proportion of the duty cycle in the PWM signal, that is, the proportion of the high level in the PWM signal.

[0057] Step S103, modulating the target color light using the energy to be attenuated, so that the color displayed on the display screen after modulation meets the color requirement.

[0058] In this step, the color requirement may refer to the requirements for color difference and color accuracy. When the PWM signal is high frequency, the afterglow effect will cause the color displayed on the display screen to shift, which does not meet the color requirement. At this time, the target color light can be modulated to eliminate this color shift.

[0059] Modulation processing may refer to dimming processing, which is used to attenuate excess energy in the target color light that can produce an afterglow effect.

[0060] In an embodiment of the present application, the target transmittance of the liquid crystal layer in the display screen can be determined according to the energy to be attenuated, and then the target transmittance is used to attenuate the brightness of the target color light passing through the liquid crystal layer, so that the brightness of the modulated target color light conforms to the Gamma curve. Among them, the Gamma curve is used to modulate the brightness of each grayscale, so that the brightness of each level of light emitted by the display screen conforms to the Gamma curve, thereby ensuring that the display screen can accurately display the details of different brightness of each pixel in the image when displaying the image. The horizontal axis of the Gamma curve is grayscale, and the vertical axis is brightness. The Gamma curve modulation method can refer to the content recorded in the patent application number 201610214546.6.

[0061] Specifically, the target light transmittance correction value can be determined according to the preset corresponding relationship between the energy to be attenuated and the light transmittance correction value. For example, if the corresponding relationship between the energy to be attenuated and the light transmittance correction value is a quadratic curve, the light transmittance correction value corresponding to the current energy to be attenuated found on the quadratic curve can be used as the target light transmittance correction value. Then, the current light transmittance is adjusted using the target light transmittance correction value, for example, the difference between the current light transmittance and the target light transmittance correction value is calculated to obtain the adjusted light transmittance. After determining the adjusted light transmittance, the liquid crystal layer is adjusted according to the adjusted light transmittance. When the liquid crystal layer is adjusted according to the adjusted light transmittance, the switching voltage corresponding to the adjusted light transmittance can be determined, the rotation angle of the liquid crystal is adjusted by the switching voltage, and the light transmittance is adjusted by the rotation angle to achieve the attenuation of the energy to be attenuated corresponding to the target color light. At the same time, the brightness of the attenuated target color light at different grayscales is calculated, and the brightness of each grayscale of the attenuated target color light is kept consistent with the Gamma curve by adjusting the light transmittance.

[0062] In addition, the Gamma curve has a minimum brightness and a maximum brightness, and the magnitude of the minimum brightness is determined by the magnitude of the signal frequency. Specifically, the minimum brightness and the maximum brightness of the display panel can be measured first, and the minimum brightness is recorded as: , the maximum brightness is recorded as: , the minimum brightness is the brightness of the 0th grayscale, and the maximum brightness is the brightness of the nth grayscale.

[0063] In order to ensure that the color difference is within a reasonable range, the minimum brightness For optimization, the following formula can be used to calculate the optimized minimum brightness: , where f represents the signal frequency of the PWM signal, for example: 10000HZ, and k represents the set time coefficient, for example: 0.02. Compare the magnitude relationship between the minimum brightness and the optimized minimum brightness, and select the brightness with the largest value between the minimum brightness and the optimized minimum brightness as the optimized minimum brightness. Wherein, k is a set value, and the k value is used to characterize the degree of influence of the afterglow effect on the color difference at the lowest brightness. The larger the k value, the greater the influence of the afterglow effect on the color difference at the lowest brightness, and the smaller the k value, the smaller the influence of the afterglow effect on the color difference at the lowest brightness. Those skilled in the art can make a choice based on the degree of influence of the color difference and the signal frequency of the display screen, and this application is not limited here.

[0064] It should be noted that the reason why the minimum brightness needs to be optimized is that when the brightness of the display is very low, the duty cycle in the PWM signal is very small (the proportion of the high level is very small). At this time, the afterglow effect will have a greater impact on the display effect of the display, resulting in serious display color difference. Therefore, in order to reduce the color difference problem caused by lower brightness, it is necessary to optimize the minimum brightness, so as to achieve the effect of reducing the color difference by raising the minimum brightness.

[0065] Then according to the optimized minimum brightness and maximum brightness , determine the coordinates of the 0th grayscale and the nth grayscale in the ideal Gamma curve coordinate system. Then, according to the coordinates of the 0th grayscale and the nth grayscale, calculate the difference between every two grayscales in the 0th to nth grayscales in the ideal Gamma curve coordinate system, so as to calculate the coordinates of the 1st to n-1st grayscales in the ideal Gamma curve coordinate system. On this basis, according to the ideal Gamma curve, calculate the brightness of the 1st to n-1st grayscales, and detect the brightness of the 0th grayscale , calculated brightness of the 1st to n-1st grayscales, detected brightness of the nth grayscale As a standard brightness value, it can be used to dim the prepared display screen.

[0066] Compared with the display screen modulation method in the prior art, the present application can select the target color light that needs to be modulated in the display screen according to the afterglow time corresponding to each color light and the single cycle time of the backlight modulation signal. When the brightness of the display screen changes, the afterglow intensity curve of the target color light can be used to determine the additional energy corresponding to the afterglow effect currently generated by the target color light under the high-frequency modulation signal, and the additional energy generated by the afterglow effect is removed through modulation processing, thereby reducing the influence of the afterglow effect on the display effect under the high-frequency modulation signal, and solving the problem of low accuracy of color display in the display screen during high-frequency PWM dimming.

[0067] Based on the same inventive concept, a high-frequency display screen modulation device corresponding to the high-frequency display screen modulation method is also provided in the embodiment of the present application. Since the principle of solving the problem by the device in the embodiment of the present application is similar to the high-frequency display screen modulation method in the embodiment of the present application, the implementation of the device can refer to the implementation of the method, and the repeated parts will not be repeated.

[0068] See also Figure 2 , Figure 2 This is a schematic diagram of the structure of a high-frequency display screen modulation device provided in an embodiment of the present application. Figure 2 As shown in , the high-frequency display screen modulation device 200 includes:

[0069] The color light selection module 201 is used to select the target color light that meets the screening rules from the three primary colors according to the afterglow time of each color light under the target backlight intensity and the single cycle time corresponding to the signal frequency of the backlight modulation signal. The single cycle time is the duration of a single cycle in the backlight modulation signal, and the target backlight intensity is the intensity of the backlight generated by the backlight modulation signal with a full duty cycle;

[0070] The energy determination module 202 is used to determine the energy to be attenuated corresponding to the target color light at the current brightness by using the afterglow intensity curve of the target color light;

[0071] The color modulation module 203 is used to modulate the target color light using the energy to be attenuated, so that the color displayed on the display screen after modulation meets the color requirements.

[0072] In a feasible implementation scheme of the present application, the color modulation module 203 is specifically used to: determine the target transmittance of the liquid crystal layer in the display screen according to the energy to be attenuated; and use the target transmittance to attenuate the brightness of the target color light passing through the liquid crystal layer so that the brightness of the modulated target color light conforms to the Gamma curve.

[0073] In a feasible implementation scheme of the present application, the color light selection module 201 is specifically used to: for each color light, determine the ratio of the afterglow time corresponding to the color light to the single cycle time; and select the color light with a ratio greater than a set threshold as the target color light.

[0074] In a feasible implementation scheme of the present application, the energy determination module 202 includes a single-cycle energy determination module and an attenuation energy determination module. The single-cycle energy determination module is used to: determine the single-cycle afterglow energy according to the afterglow intensity curve; the attenuation energy determination module is used to: determine the energy to be attenuated corresponding to the target color light according to the single-cycle afterglow energy and the proportional relationship between the backlight modulation period and the liquid crystal adjustment period.

[0075] In a feasible implementation scheme of the present application, the single-cycle energy determination module is specifically used to: integrate the light intensity within the target afterglow time interval in the afterglow intensity curve to obtain the single-cycle afterglow energy.

[0076] In a feasible implementation scheme of the present application, the attenuation energy determination module is specifically used to: determine the energy amplification coefficient according to the proportional relationship between the backlight modulation period and the liquid crystal adjustment period; and determine the product of the single-cycle afterglow energy and the energy amplification coefficient as the energy to be attenuated.

[0077] In a feasible implementation scheme of the present application, the high-frequency display screen modulation device 200 also includes an afterglow curve construction module, which is used to: construct an afterglow intensity curve according to the afterglow time of the target color light and the light intensity at different times within the afterglow time, and the afterglow intensity curve is used to characterize the change of afterglow light intensity over time.

[0078] In a feasible implementation scheme of the present application, the single-cycle energy determination module is also specifically used to: determine whether the sum of the afterglow time and the duty cycle time within a single modulation cycle at the current brightness is greater than the single-cycle time, and the duty cycle time is the duration corresponding to the high level within a single modulation cycle; if it is greater than the single-cycle time, the target afterglow time within the single modulation cycle is used as the target afterglow time interval to integrate the light intensity within the target afterglow time interval; if it is less than or equal to the single-cycle time, the afterglow time is used as the target afterglow time interval to integrate the light intensity within the target afterglow time interval.

[0079] In a feasible implementation of the present application, the Gamma curve has a minimum brightness, and the magnitude of the minimum brightness is determined by the magnitude of the signal frequency.

[0080] See also Figure 3 , Figure 3 This is a schematic diagram of the structure of an electronic device provided in an embodiment of the present application. Figure 3 As shown in , the electronic device 300 includes a processor 310 , a memory 320 and a bus 330 .

[0081] The memory 320 stores machine-readable instructions executable by the processor 310. When the electronic device 300 is running, the processor 310 communicates with the memory 320 via the bus 330. When the machine-readable instructions are executed by the processor 310, the above-mentioned Figure 1 The steps of the high-frequency display screen modulation method in the method embodiment shown, and the specific implementation methods can be referred to the method embodiment, which will not be repeated here.

[0082] The present application also provides a computer-readable storage medium on which a computer program is stored. When the computer program is executed by a processor, the computer program can execute the above-mentioned Figure 1 The steps of the high-frequency display screen modulation method in the method embodiment shown, and the specific implementation methods can be referred to the method embodiment, which will not be repeated here.

[0083] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0084] In the several embodiments provided in the present application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. The device embodiments described above are merely schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some communication interfaces, and the indirect coupling or communication connection of devices or units can be electrical, mechanical or other forms.

[0085] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0086] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0087] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a non-volatile computer-readable storage medium that is executable by a processor. Based on this understanding, the technical solution of the present application, or the part that contributes to the prior art or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium, including several instructions for a computer device (which can be a personal computer, server, or network device, etc.) to execute all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM), random access memory (RAM), disk or optical disk, and other media that can store program codes.

[0088] Finally, it should be noted that the above-described embodiments are only specific implementation methods of the present application, which are used to illustrate the technical solutions of the present application, rather than to limit them. The protection scope of the present application is not limited thereto. Although the present application is described in detail with reference to the above-mentioned embodiments, ordinary technicians in the field should understand that any technician familiar with the technical field can still modify the technical solutions recorded in the above-mentioned embodiments within the technical scope disclosed in the present application, or can easily think of changes, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A high frequency display screen modulation method, characterized in that: include: According to the afterglow time of each color light at the target backlight intensity and the single cycle time corresponding to the signal frequency of the backlight modulation signal, the target color light that meets the screening rules is selected from the three primary colors, the single cycle time is the duration of a single cycle in the backlight modulation signal, the target backlight intensity is the intensity of the backlight generated by the backlight modulation signal with a full duty cycle, and the backlight modulation signal is a high-frequency modulation signal; Determine the energy to be attenuated corresponding to the target color light at the current brightness by using the afterglow intensity curve of the target color light; Using the energy to be attenuated to modulate the target color light, so that the color displayed on the display screen after modulation meets the color requirements; The method of using the afterglow intensity curve of the target color light to determine the energy to be attenuated corresponding to the target color light at the current brightness includes: Determining a single-cycle afterglow energy according to the afterglow intensity curve; The energy to be attenuated corresponding to the target color light is determined according to the single-cycle afterglow energy and the proportional relationship between the backlight modulation cycle and the liquid crystal adjustment cycle.

2. The method according to claim 1, characterized in that: The step of modulating the target color light by using the energy to be attenuated includes: Determining a target light transmittance of a liquid crystal layer in the display screen according to the energy to be attenuated; The target light transmittance is used to attenuate the brightness of the target color light passing through the liquid crystal layer, so that the brightness of the modulated target color light conforms to the Gamma curve.

3. The method according to claim 1, characterized in that: The target color light meeting the screening rule is selected from the three primary colors according to the afterglow time of each color light under the target backlight intensity and the single cycle time corresponding to the signal frequency of the backlight modulation signal, including: For each color light, determine the ratio of the afterglow time corresponding to the color light to the single cycle time; The color light whose ratio is greater than a set threshold is selected as the target color light.

4. The method according to claim 1, characterized in that: Determining the single-cycle afterglow energy according to the afterglow intensity curve includes: The light intensity in the target afterglow time interval in the afterglow intensity curve is integrated to obtain the single-cycle afterglow energy.

5. The method according to claim 1, characterized in that The step of determining the energy to be attenuated corresponding to the target color light according to the single-cycle afterglow energy and the proportional relationship between the backlight modulation cycle and the liquid crystal adjustment cycle includes: Determining an energy amplification coefficient according to a proportional relationship between the backlight modulation period and the liquid crystal adjustment period; The product of the single-cycle afterglow energy and the energy amplification coefficient is determined as the energy to be attenuated.

6. The method according to claim 1, characterized in that The method further comprises: According to the afterglow time of the target color light and the light intensity at different times within the afterglow time, an afterglow intensity curve is constructed, and the afterglow intensity curve is used to characterize the change of afterglow light intensity over time.

7. The method according to claim 1, characterized in that The step of integrating the light intensity in the target afterglow time interval in the afterglow intensity curve to obtain the single-cycle afterglow energy includes: Determine whether the sum of the afterglow time and the duty cycle time in a single modulation cycle at the current brightness is greater than the single cycle time, where the duty cycle time is the duration corresponding to the high level in a single modulation cycle; If it is greater than the single cycle time, the afterglow time in a single modulation cycle is taken as the target afterglow time interval to integrate the light intensity in the target afterglow time interval; If it is less than or equal to the single cycle time, the afterglow time is taken as the target afterglow time interval to integrate the light intensity within the target afterglow time interval.

8. The method according to claim 2, characterized in that: The Gamma curve has a minimum brightness, and the magnitude of the minimum brightness is determined by the magnitude of the signal frequency.

9. A high-frequency display screen modulation device, characterized in that: include: A color light selection module is used to select a target color light that meets the screening rules from the three primary colors according to the afterglow time of each color light under the target backlight intensity and the single cycle time corresponding to the signal frequency of the backlight modulation signal, wherein the single cycle time is the duration of a single cycle in the backlight modulation signal, the target backlight intensity is the intensity of the backlight generated by the backlight modulation signal with a full duty cycle, and the backlight modulation signal is a high-frequency modulation signal; An energy determination module, used to determine the energy to be attenuated corresponding to the target color light at the current brightness by using the afterglow intensity curve of the target color light; A color modulation module, used to modulate the target color light using the energy to be attenuated, so that the color displayed on the display screen after modulation meets the color requirements; The energy determination module is specifically used for: Determining a single-cycle afterglow energy according to the afterglow intensity curve; The energy to be attenuated corresponding to the target color light is determined according to the single-cycle afterglow energy and the proportional relationship between the backlight modulation cycle and the liquid crystal adjustment cycle.

10. An electronic device, characterized in that: include: A processor, a storage medium and a bus, wherein the storage medium stores machine-readable instructions executable by the processor, and when the electronic device is running, the processor communicates with the storage medium via the bus, and the processor executes the machine-readable instructions to perform the steps of the high-frequency display screen modulation method as described in any one of claims 1 to 8.

11. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps of the high-frequency display screen modulation method according to any one of claims 1 to 8 are executed.

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