Display control method, display control device and display equipment

Abstract

The invention discloses a display control method, a display control device and display equipment. The method comprises the following steps: receiving input image information, and obtaining a target gray scale value of each pixel in the image information; then, matching target mapping data in the first mapping table according to each target gray-scale value; and finally, outputting a driving current to a light emitting unit of the display panel according to the target mapping data so as to control the display brightness of the display panel. Wherein the target mapping data comprises a first target modulation parameter of the first control mode and a second target modulation parameter of the second control mode. The first control mode is to control the amplitude of the driving current, and the second control mode is to control the pulse width of the driving current. In this way, the driving current in the multiple display control modes can be more accurately and orderly controlled, and therefore the display effect of the display panel is improved.

Description

Technical Field

[0001] The present application relates to the field of display technology, and in particular to a display control method, a display control device and a display equipment. Background Art

[0002] Display products based on mini light emitting diode (MLED) technology can achieve higher pixel density and higher brightness levels, thereby providing excellent image quality. The display control modes of MLED can include pulse amplitude modulation (PAM) mode and pulse width modulation (PWM) mode. When performing display control of MLED, the driving current is usually modulated by one of the PAM mode and the PWM mode to control the luminous effect of the display panel. Since the modulation methods of the PAM mode and the PWM mode are different, if the PAM mode and the PWM mode are used at the same time for the display control of MLED, it may cause problems such as control logic confusion and signal interference with each other, and it is easy to cause problems such as distortion or inaccuracy of display color, thereby affecting the display effect of MLED. Summary of the invention

[0003] The purpose of the present application is to provide a display control method, a display control device and a display equipment, so as to solve the problem of poor effect of mixed use of multiple display control modes in traditional technology.

[0004] In order to achieve the above-mentioned object, the present application provides a display control method in a first aspect, comprising:

[0005] Receive input image information and obtain a target grayscale value for each pixel in the image information;

[0006] Matching target mapping data in the first mapping table according to each target grayscale value, the target mapping data including a first target modulation parameter of the first control mode and a second target modulation parameter of the second control mode;

[0007] Outputting a driving current to a light-emitting unit of a display panel according to target mapping data to control display brightness of the display panel;

[0008] The first control mode is to control the amplitude of the driving current, and the second control mode is to control the pulse width of the driving current.

[0009] In the embodiment of the present application, before matching the target mapping data in the first mapping table according to each target grayscale value, the method further includes:

[0010] Determine a first brightness value corresponding to a plurality of grayscale values;

[0011] Determining a plurality of modulation parameter combinations based on a plurality of grayscale values, the modulation parameter combinations comprising a first modulation parameter of a first control mode and a second modulation parameter of a second control mode;

[0012] Obtaining the second brightness value corresponding to each modulation parameter combination respectively;

[0013] Determine a modulation parameter combination corresponding to a second brightness value equal to the first brightness value as mapping data corresponding to a grayscale value;

[0014] A first mapping table is established based on a mapping relationship between grayscale values ​​and mapping data.

[0015] In the embodiment of the present application, determining the first brightness value corresponding to the plurality of grayscale values ​​includes:

[0016] Obtaining a third brightness value corresponding to a first grayscale value among a plurality of grayscale values;

[0017] Determining a fourth brightness value corresponding to a second grayscale value other than the first grayscale value among the plurality of grayscale values ​​based on the set gamma curve and the third brightness value;

[0018] The first brightness value is determined according to the third brightness value and the fourth brightness value.

[0019] In an embodiment of the present application, multiple modulation parameter combinations are determined based on multiple grayscale values, including:

[0020] Determine a first count value corresponding to the grayscale value in the first control mode, and a second count value corresponding to the grayscale value in the second control mode;

[0021] constructing a second mapping table based on the grayscale value, the first count value, and the second count value;

[0022] Dividing the plurality of grayscale values ​​into a plurality of grayscale value intervals, and determining a target control mode for each grayscale value interval, the target control mode being the first control mode or the second control mode;

[0023] The count value interval corresponding to the target control mode is determined according to the second mapping table to obtain a plurality of modulation parameter combinations.

[0024] In the embodiment of the present application, the count value interval corresponding to the target control mode is determined according to the second mapping table to obtain multiple modulation parameter combinations, including:

[0025] If the target control mode is the first control mode, determining a first count value interval corresponding to the grayscale value interval according to the second mapping table, and determining the second count value of the second control mode in the grayscale value interval as the third count value;

[0026] determining a first modulation parameter combination according to the third count value and each first count value in the first count value interval;

[0027] If the target control mode is the second control mode, determining a second count value interval corresponding to the grayscale value interval according to the second mapping table, and determining the first count value of the first control mode in the grayscale value interval as the fourth count value;

[0028] determining a second modulation parameter combination according to each second count value in the interval between the fourth count value and the second count value;

[0029] A plurality of modulation parameter combinations are obtained based on the first modulation parameter combination and the second modulation parameter combination.

[0030] In the embodiment of the present application, a plurality of grayscale values ​​are divided into a plurality of grayscale value intervals, and a target control mode for each grayscale value interval is determined, including:

[0031] Dividing the plurality of grayscale values ​​into a first interval and a second interval, the grayscale value of the first interval being greater than the grayscale value of the second interval;

[0032] The target control mode of the first interval is determined as the first control mode, and the target control mode of the second interval is determined as the second control mode; or the target control mode of the first interval is determined as the second control mode, and the target control mode of the second interval is determined as the first control mode.

[0033] In the embodiment of the present application, a plurality of grayscale values ​​are divided into a plurality of grayscale value intervals, and a target control mode for each grayscale value interval is determined, including:

[0034] Dividing the plurality of grayscale values ​​into a third interval, a fourth interval and a fifth interval, the grayscale value of the third interval being greater than the grayscale value of the fourth interval, and the grayscale value of the fourth interval being greater than the grayscale value of the fifth interval;

[0035] The target control mode in the third section and the fifth section is determined as the first control mode, and the target control mode in the fourth section is determined as the second control mode.

[0036] In an embodiment of the present application, outputting a driving current to a light-emitting unit of a display panel according to target mapping data to control the display brightness of the display panel includes:

[0037] Determine a first driving current corresponding to the first target modulation parameter according to a third mapping table;

[0038] Determine a second driving current corresponding to a second target modulation parameter according to a fourth mapping table;

[0039] Determine a driving current of a light emitting unit corresponding to each pixel according to the first driving current and the second driving current;

[0040] The driving current is output to each light emitting unit based on the driving sequence of each display pixel of the display panel to control the display brightness of the display panel.

[0041] A second aspect of the present application provides a display control device, comprising:

[0042] An acquisition module, used to receive input image information and acquire a target grayscale value of each pixel in the image information;

[0043] A determination module, configured to match target mapping data in a first mapping table according to each target grayscale value, the target mapping data including a first target modulation parameter of a first control mode and a second target modulation parameter of a second control mode;

[0044] A control module, used to output a driving current to a light-emitting unit of a display panel according to target mapping data, so as to control display brightness of the display panel;

[0045] The first control mode is to control the amplitude of the driving current, and the second control mode is to control the pulse width of the driving current.

[0046] A third aspect of the present application provides a display device, including the above-mentioned display control device, the display device comprising:

[0047] Display panel;

[0048] a memory configured to store instructions; and

[0049] The processor is configured to call instructions from the memory and implement the above display control method when executing the instructions.

[0050] To summarize, by adopting the technical solution of the present application, based on the first mapping table, the corresponding target mapping data is found according to the target grayscale value of each pixel in the image information, and then the modulation parameters of the first control mode and the second control mode are controlled separately based on the target mapping data. This can more accurately and orderly control the driving currents in multiple display control modes, thereby improving the display effect of the display panel.

[0051] Other features and advantages of the present application will be described in detail in the subsequent detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0053] Figure 1 A schematic diagram of the control principle of a PAM mode of an MLED display device;

[0054] Figure 2(a)-Figure 2(c) A schematic diagram of the control principle of a PWM mode of an MLED display device;

[0055] Figure 3 A schematic diagram of an application scenario of a display control method provided in an embodiment of the present application;

[0056] Figure 4 A flow chart of a display control method provided in an embodiment of the present application;

[0057] Figure 5 A schematic diagram of a flow chart of a method for establishing a first mapping table provided in an embodiment of the present application;

[0058] Figure 6 A schematic diagram of determining a target control mode provided in an embodiment of the present application;

[0059] Figure 7 A schematic diagram of determining a target control mode provided in another embodiment of the present application;

[0060] Figure 8 A schematic diagram of determining a target control mode provided in another embodiment of the present application;

[0061] Fig. 9 A schematic diagram of the light-emitting characteristics of a light-emitting unit provided in an embodiment of the present application;

[0062] Fig.10 A schematic diagram of a display control method provided in a specific embodiment of the present application;

[0063] Fig.11 A schematic diagram of the structure of a display control device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0064] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of this application.

[0065] In the description of the present application, it should be understood that the terms "first" and "second" are used only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined. In the present application, the word "exemplary" is used to mean "used as an example, illustration or description". Any embodiment described as "exemplary" in the present application is not necessarily interpreted as being more preferred or more advantageous than other embodiments. In order to enable any technician in the field to implement and use the present application, the following description is given. In the following description, details are listed for the purpose of explanation. It should be understood that a person of ordinary skill in the art can recognize that the present application can also be implemented without using these specific details. In other examples, well-known structures and processes will not be elaborated in detail to avoid unnecessary details that make the description of the present application obscure. Therefore, the present application is not intended to be limited to the embodiments shown, but is consistent with the widest range of principles and features disclosed in the present application.

[0066] The MLED display device may include a control circuit and a display panel. The control circuit is used to generate an appropriate control signal according to an input signal or instruction. The display mode of the MLED display device may include direct display and backlight display. In the direct display MLED, the display panel is composed of a plurality of tiny light emitting diodes (LEDs), and each LED can be used as a light emitting unit to emit light independently. In the backlight display, the display panel includes a liquid crystal layer and a backlight module. The liquid crystal layer is used to adjust the degree of light transmission, and the backlight module provides a backlight source. The backlight module may include a plurality of LEDs, which serve as light emitting units to provide backlight illumination. The control signal generated by the control circuit can control the brightness of the LED, and the brightness of the backlight module can be adjusted, so that the display panel can display the required image and content. Among them, the control signal may include a pulse signal, and the pulse signal generated by the control circuit is adjusted by a set modulation mode, so that the intensity of the driving current can be controlled, and the light emitting brightness of the LED can be adjusted, thereby controlling the display brightness of the display panel. The display panel can perform display control through a variety of modulation modes, and the following is an example of PAM and PWM modes.

[0067] In the PAM mode, the driving current can be adjusted by adjusting the amplitude of the pulse signal, thereby controlling the display brightness of each pixel of the display panel, wherein the amplitude level of the pulse can represent the brightness level of the pixel. Figure 1 The schematic diagram of the control principle of the PAM mode of an MLED display device. When the switching frequency of the LED of the backlight module of the display device is constant, the control circuit of each pixel is controlled by outputting a set PAM voltage to convert the PAM voltage into the current control of the LED, so as to control the brightness of the LED corresponding to each pixel. At low brightness, since the required current is small, it is easy to fluctuate, resulting in low current control accuracy. At the same time, the spectral emission fluctuation of the LED is greater at a lower current, resulting in inconsistent brightness and color points of the LED, which leads to the phenomenon of pitting when the grayscale value of the pixel is low. Pit refers to the situation where small dots of light or dark spots appear on the backlight module or display panel.

[0068] In PWM mode, the driving current can be adjusted by adjusting the width of the pulse signal, thereby controlling the display brightness of each pixel of the display panel. The high level time of the pulse signal determines the brightness level of the pixel. Figure 2(a)-Figure 2(c) The schematic diagram of the control principle of the PWM mode of an MLED display device. As shown in FIG2(a), the PWM mode controls the brightness of the LED by controlling the LED frequency switch. By outputting the PWM data voltage, the PWM data voltage is stored in the capacitor through the pixel control circuit to match the sweep signal. As shown in FIG2(b) and FIG2(c), the voltage of the sweep signal slowly decreases. When there is a voltage drop across the capacitor, the charge of the capacitor is pulled down. The brightness of the corresponding LED of the pixel is controlled by controlling the conduction or shutdown of the thin-film transistor (TFT) of the pixel. When the charge of the capacitor drops to a certain level, the TFT can be turned on by PWM control. Therefore, the PWM mode converts the PWM data voltage into time, and controls the light-emitting time of the LED by the duty cycle of the PWM signal. When the LED is at a lower brightness, the TFT is turned on for a shorter time within a scanning cycle of the corresponding pixel, which makes the display panel prone to flickering.

[0069] In the mixed mode of PAM and PWM, in the same video source or picture source, the driving current needs to be controlled based on the data of the PAM mode and the PWM mode at the same time. In this way, it is easy to cause the control logic to be confused and interfere with each other, and further cause problems such as distortion or inaccuracy of display color, thereby affecting the display effect. Based on this, the embodiment of the present application performs pre-parameter settings according to the needs, and uses the combination formed by the corresponding modulation parameters during the mixed control of the PAM mode and the PWM mode as mapping data, and stores the mapping relationship between the mapping data and each grayscale value. In this way, the corresponding mapping data can be determined according to the grayscale value of each pixel of the received image information, thereby obtaining the modulation parameters of the PAM mode and the PWM mode, so that the PAM mode and the PWM mode can control the display brightness of pixels with different grayscale values ​​in an orderly and accurate manner.

[0070] like Figure 3 As shown, Figure 3 Schematic diagram of an application scenario of a display control method provided in an embodiment of the present application. The application scenario in the embodiment of the present application is a display device, for example, an MLED display device, which may include a display panel 310, a processor 320, a memory 330, an input module 340, a transmission module 350, and a switching module 360.

[0071] The display panel 310 provides backlight through the light-emitting unit to display images. The processor 320 communicates with the display panel 310, and obtains the driving current of each pixel after processing the received input information, thereby controlling the display brightness of each pixel. The processor 320 can be a programmable chip such as a Field Programmable Gate Array (FPGA) or an Advanced RISC Machines (ARM).

[0072] The input information of the input module 340 may include video data input through a display port (DisplayPort, DP) or a high-definition multimedia interface (High-Definition Multimedia Interface, HDMI), or picture data input through a secure digital card (Secure Digital, SD) card.

[0073] The memory 330 may include a random access memory (RAM). The RAM may be an external storage RAM or a RAM inside a chip in the processor 320. In one example, the memory 330 may include a first sub-memory and a second sub-memory, wherein the first sub-memory is used to store the modulation parameters of the first control mode, and stores a first mapping relationship between the target grayscale value and the first target modulation parameter. The second sub-memory is used to store the modulation parameters of the second control mode, and stores a second mapping relationship between the target grayscale value and the second target modulation parameter. Among them, the first control mode and the second control mode are two control modes of different types. In the embodiment of the present application, the first control mode is used to control the amplitude of the driving current, and the second control mode is used to control the pulse width of the driving current as an example. For example, the first control mode is a PAM mode, and the second control mode is a PWM mode. In this way, the memory 330 may include two RAMs, one storing the modulation parameters corresponding to the PAM mode, and the other storing the modulation parameters corresponding to the PWM mode. For example, the RAM has 256 addresses and the data content is 10 bits (bit), wherein the 256 addresses correspond to displaying 256 grayscale values, and the 10-bit content of each address is the corresponding mapping data. Due to the characteristics of RAM, the size of each address data can be a random size. Therefore, the modulation parameters of the PAM mode and the PWM mode can be set to any size under different grayscale values.

[0074] The processor 320 can generate a corresponding driving current based on the mapping data composed of the modulation parameters of the first control mode and the second control mode, and then transmit it to the display panel 310 through the transmission module 350. In one example, the driving current corresponding to the first control mode and the second control mode can be switched to the corresponding control circuit through the switching module 360. Among them, the switching module can be a multiplexer (Multiplexer, MUX). In another example, the driving current corresponding to the first control mode and the second control mode can also be transmitted to the control circuit through two channels.

[0075] It should be noted that Figure 3 The application scenario of the display control method shown is merely an example. The application scenario of the display control method described in the embodiment of the present application is intended to more clearly illustrate the technical solution of the embodiment of the present application, and does not constitute a limitation on the technical solution provided in the embodiment of the present application.

[0076] Based on the application scenario of the above display control method, the embodiment of the present application proposes an embodiment of the display control method.

[0077] Figure 4 FIG. 1 is a flow chart of a display control method provided in an embodiment of the present application. Figure 4As shown, the display control method can execute steps 401-403 through the above-mentioned processor 320, which will be described in detail below.

[0078] Step 401: When receiving input image information, obtain the target grayscale value of each pixel in the image information.

[0079] In an embodiment of the present application, the image information may include multiple pixels, and the grayscale value corresponding to each pixel is the target grayscale value. In one example, the image information may be directly acquired picture data, or it may be image frame data extracted from acquired video data. If the acquired data is picture data, the target grayscale value of each pixel in the picture data may be directly extracted. If the acquired data is video data, the video data needs to be processed to obtain multiple frames of static pictures, namely, image frame data. Then, the target grayscale value of each pixel is extracted from the image frame data.

[0080] Step 402: Match target mapping data in a first mapping table according to each target grayscale value, where the target mapping data includes a first target modulation parameter of a first control mode and a second target modulation parameter of a second control mode.

[0081] In an embodiment of the present application, the first mapping table is a mapping table established in advance that stores a mapping relationship between grayscale values ​​and mapping data. The mapping data refers to a combination of modulation parameters corresponding to the first control mode and the second control mode during mixed control. The target mapping data is the mapping data corresponding to each target grayscale value. The target mapping data includes a first target modulation parameter and a second target modulation parameter. The first target modulation parameter is a modulation parameter corresponding to the first control mode having a mapping relationship with the target grayscale value, and the second target modulation parameter is a modulation parameter corresponding to the second control mode having a mapping relationship with the target grayscale value. The first target modulation parameter and the second target modulation parameter are a preferred modulation parameter combination set in advance according to demand, indicating that at the target grayscale value, the target mapping data can better perform display control.

[0082] Step 403 : outputting a driving current to the light-emitting unit of the display panel according to the target mapping data to control the display brightness of the display panel.

[0083] In an embodiment of the present application, the driving current in the first control mode and the second control mode can be determined based on the target mapping data, so that the backlight module of the display panel can perform backlight display according to the respective driving currents, so that the display panel displays the corresponding brightness according to the light-emitting unit of each pixel. In one example, the driving current of the first control mode and the driving current of the second control module can be switched and transmitted through a switching module. In another example, the driving current of the first control mode and the second control mode can also be transmitted through two channels respectively.

[0084] The embodiment of the present application is based on a first mapping table established in advance. The corresponding target mapping data is found according to the target grayscale value of each pixel in the image information, and the modulation parameters of the first control mode and the second control mode are controlled separately based on the target mapping data. It can more accurately and orderly control the driving current under multiple display control modes, thereby improving the display effect of the display panel.

[0085] Figure 5 FIG. 1 is a flow chart of a method for establishing a first mapping table provided in an embodiment of the present application. Figure 5 As shown, in the embodiment of the present application, the method for establishing the first mapping table may include steps 501-504, etc., which are described in detail below.

[0086] Step 501: Determine first brightness values ​​corresponding to a plurality of grayscale values ​​equal in number to a set address.

[0087] Step 502: Determine a plurality of modulation parameter combinations based on a plurality of grayscale values, where the modulation parameter combinations include a first modulation parameter of a first control mode and a second modulation parameter of a second control mode.

[0088] Step 503: Obtain the second brightness value corresponding to each modulation parameter combination respectively, and determine the modulation parameter combination corresponding to the second brightness value equal to the first brightness value as mapping data corresponding to the grayscale value.

[0089] Step 504: Establish a first mapping table based on the mapping relationship between the grayscale value and the mapping data.

[0090] In an embodiment of the present application, the number of grayscale values ​​can be determined based on the number of addresses stored in the memory. For example, assuming that the number of addresses of the memory is 256, the brightness values ​​corresponding to the 256 grayscale values ​​can be determined based on the image information, and the brightness value is the first brightness value. Assuming that the data content of the first control mode and the second control mode is 10 bits, each control mode can have 1024 data changes, that is, 1024 modulation parameters. Among them, the modulation parameter of the first control mode is the first modulation parameter, and the modulation parameter of the second control mode is the second modulation parameter. For example, the modulation parameter of the first control mode can be 1024 values, and the modulation parameter of the second control mode can be 1024 values.

[0091] Since the brightness adjustment range of the LED in the PAM mode usually changes from the minimum amplitude (e.g., 0) to the maximum amplitude (e.g., 1023), and the brightness adjustment range of the LED in the PWM mode usually changes from the maximum brightness (e.g., 1023) to completely off (e.g., 0), for 256 grayscale values, when the PAM mode and the PWM mode are adjusted at the same time, there can be 1024 modulation parameter combinations. The brightness value corresponding to the light-emitting state of the LED under each modulation parameter combination is the second brightness value.

[0092] Then, find 256 second brightness values ​​that are equal to the above 256 first brightness values ​​among the 1024 second brightness values, and these 256 second brightness values ​​are mapping data. Each mapping data corresponds to a grayscale value, representing a modulation parameter combination that can achieve a better display effect at the grayscale value. Finally, based on the mapping relationship between each grayscale value and the mapping data, a first mapping table can be established. In this way, only the target grayscale value needs to be obtained to find the corresponding target mapping data, thereby obtaining the first target modulation parameter of the first control mode and the second target modulation parameter of the second control mode at each target grayscale value.

[0093] In step 501 of the embodiment of the present application, a third brightness value corresponding to a first grayscale value among multiple grayscale values ​​may be first obtained. Then, based on the set gamma curve and the third brightness value, a fourth brightness value corresponding to a second grayscale value other than the first grayscale value among the multiple grayscale values ​​may be determined. Finally, the first brightness value may be determined according to the third brightness value and the fourth brightness value.

[0094] In an embodiment of the present application, a first brightness value can be determined based on a gamma curve. When image information is acquired, the maximum brightness of the image information can be obtained. Therefore, the maximum grayscale value can be selected as the first grayscale value, and among multiple grayscale values, the grayscale values ​​other than the first grayscale value are the second grayscale values. In this way, a third brightness value corresponding to the first grayscale value, that is, the maximum brightness of the image information, can be obtained. Then, the brightness value of the second grayscale value can be determined according to the third brightness value and the set gamma curve, and the brightness value of the second grayscale value is the fourth brightness value. Among them, the gamma curve is set to a gamma curve determined based on the characteristics of the display device, for example, the set gamma curve can be gamma2.2. Finally, the third brightness value corresponding to the first grayscale value and the fourth brightness value corresponding to the second grayscale value are combined to obtain the first brightness value of each grayscale value. By combining the maximum brightness value and setting the gamma curve, the first brightness value corresponding to each grayscale value can be determined more efficiently.

[0095] In one example, take the first control mode as PAM mode and the second control mode as PWM mode as an example. Assume that there are 256 grayscale values ​​in total and there are 9 binding points, and the 9 binding points can output 9 voltages. First, the third brightness value needs to be determined. Specifically, the modulation parameter of the PWM mode can be controlled to be the maximum value 1023, which corresponds to the binding point voltage of gamma9. The modulation parameter of the PAM mode is controlled to be the minimum value 0, which is the voltage of the gamma1 binding point. Adjust the voltages of gamma1 and gamma9 to ensure that the grayscale value 255 can reach the first brightness value. Then, according to the gamma curve gamma2.2, the brightness values ​​of grayscale value 0 to grayscale value 254 are determined in sequence to obtain the fourth brightness value. Finally, the first brightness value can be obtained based on the third brightness value and the fourth brightness value.

[0096] In step 502 of the embodiment of the present application, a first count value corresponding to the grayscale value in the first control mode and a second count value corresponding to the grayscale value in the second control mode can be first determined. Then, a second mapping table is constructed based on the grayscale value, the first count value and the second count value. Then, multiple grayscale values ​​are divided into multiple grayscale value intervals, and a target control mode for each grayscale value interval is determined. Among them, the target control mode is the first control mode or the second control mode. Finally, the count value interval corresponding to the target control mode is determined according to the second mapping table, and multiple modulation parameter combinations are obtained.

[0097] In the embodiment of the present application, the count value refers to a numerical value that characterizes the modulation level corresponding to the grayscale value in each control mode, the first count value is the count value corresponding to the grayscale value in the first control mode, and the second count value is the count value corresponding to the grayscale value in the second control mode. Take the first control mode as PAM mode, the second control mode as PWM mode, and the data content of each address as 10 bits as an example. For the PAM mode, the first count value represents the amplitude of the pulse signal, where 0 represents the lowest amplitude and 1023 represents the highest amplitude. For the PWM mode, the second count value represents the duty cycle of the pulse signal, where 0 represents the minimum width, that is, the pulse is off, and 1023 represents the maximum width, that is, the pulse is fully on.

[0098] In the embodiment of the present application, a second mapping table can be constructed based on the mapping relationship between each grayscale value and the corresponding first count value and second count value, and the second mapping table is a mapping table that characterizes the corresponding relationship between the grayscale value and the count value. Since the grayscale value is 256, the modulation parameter combination obtained by combining the first count value and the second count value is 1024. Therefore, it is necessary to correspond the modulation parameter combination to the grayscale value.

[0099] Still taking the first control mode as the PAM mode and the second control mode as the PWM mode as an example. According to the control characteristics of the PAM mode and the PWM mode, the first count value of the PAM mode can be arranged from 0 to 1023, the second count value of the PWM mode can be arranged from 1023 to 0, and the grayscale value can be arranged from the maximum grayscale value to the minimum grayscale value. Then, according to the needs, the multiple grayscale values ​​are divided into multiple grayscale value intervals, and the target control mode corresponding to each grayscale value interval is determined. Among them, the target control mode is the dominant control mode in the grayscale value interval, which is the PAM mode or the PWM mode. The target control mode needs to be changed in this interval so that the brightness value corresponding to the grayscale value in the grayscale value interval changes.

[0100] In an embodiment of the present application, if the target control mode is the first control mode, a first count value interval corresponding to the grayscale value interval is determined according to the second mapping table, and the second count value of the second control mode in the grayscale value interval is determined as the third count value. The second count value includes the third count value. Then, the first modulation parameter combination is determined according to the third count value and each first count value in the first count value interval. The first modulation parameter combination is a modulation parameter combination when the target control mode is the first control mode. The second count value in the first modulation parameter combination remains unchanged, and the first count value changes.

[0101] For example, if the target control mode is the PAM mode, then in the grayscale value interval, the first count value corresponding to the PAM mode changes, while the second count value corresponding to the PWM mode does not change, and the second count value is determined as the third count value. The third count value is a fixed value, which is one of the second count values. Based on the third count value and the changed first count value, the first modulation parameter combination of the grayscale value interval can be obtained.

[0102] In an embodiment of the present application, if the target control mode is the second control mode, a second count value interval corresponding to the grayscale value interval is determined according to the second mapping table, and the first count value of the first control mode in the grayscale value interval is determined as the fourth count value. The first count value includes the fourth count value. Then, a second modulation parameter combination is determined according to the fourth count value and each second count value in the second count value interval. The second modulation parameter combination is a modulation parameter combination when the target control mode is the second control mode. The first count value in the second modulation parameter combination remains unchanged, and the second count value changes.

[0103] For example, if the target control mode is the PWM mode, then in the grayscale value interval, the first count value corresponding to the PAM mode does not change, and the first count value is determined as the fourth count value. The fourth count value is a fixed value, which is one of the first count values. The second count value corresponding to the PWM mode changes. Based on the fourth count value and the changed second count value, a second modulation parameter combination for the grayscale value interval can be obtained.

[0104] Finally, multiple modulation parameter combinations are obtained based on the first modulation parameter combination and the second modulation parameter combination. In this way, a modulation parameter combination that can meet the needs can be obtained through the divided grayscale value intervals and the corresponding target control mode. The PWM mode and PAM mode in the related art are usually mixed, and in order to achieve the required brightness value, they usually cause mutual display interference. The embodiment of the present application selects the target control mode for different grayscale value intervals based on the display effect required by the user, and can more accurately control the mixed mode for different grayscale values, thereby improving the display effect of the display device.

[0105] In the embodiment of the present application, the grayscale value interval can be arbitrarily divided according to the requirements and the target control mode of each grayscale value interval can be determined. The following is an example of the division of three grayscale value intervals. Still taking the first control mode as the PAM mode, the second grayscale mode as the PWM mode, the grayscale value as 256, and the first count value and the second count value as 1024 as an example.

[0106] Figure 6 FIG. 1 is a schematic diagram of determining a target control mode provided in an embodiment of the present application. Figure 6 As shown, in one embodiment, a plurality of grayscale values ​​may be divided into a first interval and a second interval. The grayscale value of the first interval is greater than the grayscale value of the second interval. That is, the first interval is a high grayscale value interval, and the second interval is a low grayscale value interval. Then, the target control mode of the first interval is determined as the first control mode, and the target control mode of the second interval is determined as the second control mode. For example, the target control mode of the high grayscale value interval is the PAM mode, and the target control mode of the low grayscale value interval is the PWM mode.

[0107] Table 1 is a division table of grayscale value intervals provided in an embodiment of the present application. As shown in Table 1, the dividing point between the high grayscale value interval and the low grayscale value interval is between the grayscale value 127 and the grayscale value 128. In the high grayscale value interval, the second count value of the PWM mode can be fixed at 1023, and the first count value of the PAM mode can be increased from 0 to the first count value corresponding to the grayscale value 128, that is, 511. In the low grayscale value interval, the first count value of the PAM mode is fixed at 511, and the second count value corresponding to the grayscale value 127 is 1020. Therefore, the second count value of the PWM mode can be reduced from 1020 to 511.

[0108] Table 1

[0109]

[0110] In this embodiment, in the low grayscale value range, since the driving current controlled by the PAM mode is lower than the driving current controlled only by the PWM mode, the accuracy of display control based on the mapping data is higher than that of display control only by the PWM mode, thereby alleviating the problem of flickering of the display device at low grayscale.

[0111] Figure 7 FIG. 1 is a schematic diagram of determining a target control mode provided in another embodiment of the present application. Figure 7 As shown, in another embodiment, a plurality of grayscale values ​​may be divided into a first interval and a second interval, and the grayscale value of the first interval is greater than the grayscale value of the second interval. That is, the first interval is a high grayscale value interval, and the second interval is a low grayscale value interval. Then, the target control mode of the first interval is determined as the second control mode, and the target control mode of the second interval is determined as the first control mode. That is, the target control mode of the high grayscale value interval is the PWM mode, and the target control mode of the low grayscale value interval is the PAM mode.

[0112] Table 2 is a division table of grayscale value intervals provided in an embodiment of the present application. As shown in Table 2, the dividing point between the high grayscale value interval and the low grayscale value interval is between the grayscale value 127 and the grayscale value 128. In the high grayscale value interval, the first count value of the PAM mode can be fixed at 0, and the second count value of the PWM mode can be sequentially reduced from 1023 to the second count value corresponding to the grayscale value 128, that is, 511. In the low grayscale value interval, the second count value of the PWM mode is fixed at 511, and the first count value corresponding to the grayscale value 127 is 1, so the second count value of the PAM mode can be increased from 1 to 511.

[0113] Table 2

[0114]

[0115] In this embodiment, in the low grayscale value range, since the duty cycle controlled by the PWM mode is much smaller than the duty cycle controlled only by the PAM mode, the accuracy of display control based on the mapping data is higher than that of display control only by the PAM mode, thereby alleviating the problem of pitting in the display device at low grayscale.

[0116] Figure 8 FIG. 1 is a schematic diagram of determining a target control mode provided in another embodiment of the present application. Figure 8 As shown, in another embodiment, based on Figure 6 The technical solution shown is further optimized. According to the TFT switch tube characteristics of the control circuit, when the TFT switch tube is turned on, it takes a certain amount of time to turn on, resulting in a ramp-up process of the light-emitting current of the LED when it is emitting light. Fig. 9 A schematic diagram of the light-emitting characteristics of a light-emitting unit provided in an embodiment of the present application. Fig. 9 As shown, when the light-emitting current is climbing, if PWM mode control is used, inaccurate control is likely to occur. Therefore, in the climbing stage, the display control using the PAM mode is better than the display control using the PWM mode. Based on this, multiple grayscale values ​​can be divided into a third interval, a fourth interval, and a fifth interval. Among them, the grayscale value of the third interval is greater than the grayscale value of the fourth interval, and the grayscale value of the fourth interval is greater than the grayscale value of the fifth interval. In other words, the third interval is a high grayscale value interval, the fourth interval is a medium grayscale interval, and the fifth interval is a low grayscale value interval. Then, the target control mode of the third interval and the fifth interval is determined as the first control mode, and the target control mode of the fourth interval is determined as the second control mode. In other words, the target control mode of the high grayscale value interval and the low grayscale value interval is the PAM mode, and the target control mode of the medium grayscale interval is the PWM mode.

[0117] Table 3 is a division table of grayscale value intervals provided in another embodiment of the present application. As shown in Table 3, the dividing point between the high grayscale value interval and the medium grayscale value interval is between the grayscale value 127 and the grayscale value 128, and the dividing point between the medium grayscale value interval and the low grayscale value interval is between the grayscale value 30 and the grayscale value 31. In the high grayscale value interval, the second count value of the PWM mode can be fixed at 1023, and the first count value of the PAM mode can be increased from 0 to the first count value corresponding to the grayscale value 128, that is, 511. In the medium grayscale value interval, the first count value of the PAM mode can be fixed at 511, the second count value corresponding to the grayscale value 127 is 1020, and the second count value corresponding to the grayscale value 31 is 639. The second count value of the PAM mode can be reduced from 1020 to 639. In the low grayscale value interval, the first count value of the PWM mode can be fixed at 639, and the first count value corresponding to the grayscale value 30 is 512, so the second count value of the PWM mode can be increased from 512 to 639.

[0118] Table 3

[0119]

[0120] In this embodiment, the driving current is controlled by the PAM mode in the high grayscale value interval. Since the driving current controlled by the PAM mode is lower than the driving current controlled by the PWM mode alone, the accuracy of display control based on the mapping data is higher than that of display control performed by the PWM mode alone. The driving current is also controlled by the PAM mode in the low grayscale value interval. The climbing process of the LED light emitting current is controlled by the PAM mode. Compared with the control accuracy of the PWM mode, it is higher, so that the flickering problem of the display device at low grayscale can be more accurately alleviated.

[0121] In step 403 of the embodiment of the present application, firstly, a first driving current corresponding to a first target modulation parameter is determined according to a third mapping table established in advance. Then, a second driving current corresponding to a second target modulation parameter is determined according to a fourth mapping table established in advance. Then, the driving current of the light-emitting unit corresponding to each pixel is determined according to the first driving current and the second driving current. Finally, the driving current is output to each light-emitting unit based on the driving sequence of each display pixel of the display panel to control the display brightness of the display panel.

[0122] In an embodiment of the present application, the third mapping table includes the correspondence between the first modulation parameter of the first control mode and the first drive current, and the fourth mapping table includes the relationship between the second modulation parameter and the second drive current. Among them, the first drive current is the drive current under the first control mode, and the second drive current is the drive current under the second control mode. In this way, after determining the first target modulation parameter, the corresponding first drive current can be found through the third mapping table. After determining the second target modulation parameter, the corresponding second drive current can be found through the fourth mapping table. In this way, the drive current of the light-emitting unit corresponding to each pixel can be obtained according to the first drive current and the second drive current. Finally, based on the drive sequence of each display pixel of the display panel, the drive current is output to each light-emitting unit, thereby controlling the display brightness of the display panel.

[0123] Combine the following Figure 3 The application environment describes in detail a display control method in a specific embodiment. Fig.10 FIG. 1 is a flow chart of a display control method provided in a specific embodiment of the present application. Fig.10 As shown, first, the pre-set mapping data can be encapsulated into the RAM of the corresponding PAM mode and PWM mode for subsequent calls. Then, the received video data of the DP / HDMI input or the picture data in the SD card is selected through the MUX to store the corresponding image data in the double data rate (Double Data Rate, DDR) dynamic random access memory. Then, the same frame of image information stored in the DDR dynamic random access memory is read respectively by two data channels of the PAM mode and the PWM mode. According to the target grayscale value of each pixel in the image information as the address of the RAM, the target mapping data corresponding to the target grayscale value of each pixel in the RAM is read. Then, according to the pixel output order of the PAM mode and the PWM mode of the control circuit, the target mapping data is stored in the first-in-first-out (Fist Input First Output, FIFO) queue. Finally, in conjunction with the timing of the control circuit, the data in the FIFO queue is read out and sent to the display panel. In this way, based on the first mapping table established in advance, the corresponding target mapping data is found according to the target grayscale value of each pixel in the image information, and then the modulation parameters of the first control mode and the second control mode are controlled separately based on the target mapping data. The driving current in multiple display control modes can be controlled more accurately and orderly, thereby improving the display effect of the display panel.

[0124] Fig.11 FIG. 1 is a schematic diagram of a display control device 1100 provided in an embodiment of the present application. Fig.11As shown, the display control device 1100 includes an acquisition module 1101, a determination module 1102 and a control module 1103. The acquisition module 1101 is used to receive input image information and obtain the target grayscale value of each pixel in the image information. The determination module 1102 is used to match the target mapping data in the first mapping table according to each target grayscale value. The target mapping data includes a first target modulation parameter of a first control mode and a second target modulation parameter of a second control mode. The control module 1103 is used to output a driving current to the light-emitting unit of the display panel according to the target mapping data to control the display brightness of the display panel. The first control mode is to control the amplitude of the driving current, and the second control mode is to control the pulse width of the driving current.

[0125] Among them, the acquisition module 1101, the determination module 1102 and the control module 1103 can be used to execute steps 401-403 in the embodiment corresponding to the above-mentioned display control method respectively. For the specific implementation methods of these modules and more details, please refer to the corresponding method part, which will not be repeated here.

[0126] An embodiment of the present application also provides a machine-readable storage medium, on which instructions are stored. When the instructions are executed by a processor, the processor is configured to execute the above-mentioned display control method.

[0127] Since the instructions stored in the display device and the machine-readable storage medium can execute the steps in any display control method provided in the embodiments of the present application, the beneficial effects that can be achieved by any display control method provided in the embodiments of the present application can be achieved. Please refer to the previous embodiments for details and will not be repeated here.

[0128] It should also be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the process, method, commodity or device including the elements.

[0129] The above are only embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included within the scope of the claims of the present application.

Claims

1. A display control method, characterized in that: include: Receiving input image information, and obtaining a target grayscale value of each pixel in the image information; Matching target mapping data in the first mapping table according to each of the target grayscale values, the target mapping data including a first target modulation parameter of the first control mode and a second target modulation parameter of the second control mode; Outputting a driving current to a light-emitting unit of a display panel according to the target mapping data to control display brightness of the display panel; The first control mode is to control the amplitude of the driving current, and the second control mode is to control the pulse width of the driving current.

2. The display control method according to claim 1, characterized in that: Before matching the target mapping data in the first mapping table according to each of the target grayscale values, the method further includes: Determine a first brightness value corresponding to a plurality of grayscale values ​​equal to the number of set addresses; Determine a plurality of modulation parameter combinations based on the plurality of grayscale values, the modulation parameter combinations comprising a first modulation parameter of the first control mode and a second modulation parameter of the second control mode; Respectively obtain a second brightness value corresponding to each of the modulation parameter combinations; Determine a modulation parameter combination corresponding to a second brightness value equal to the first brightness value as mapping data corresponding to the grayscale value; The first mapping table is established based on a mapping relationship between the grayscale value and the mapping data.

3. The display control method according to claim 2, characterized in that: The determining of first brightness values ​​corresponding to a plurality of grayscale values ​​equal in number to the set address comprises: Acquire a third brightness value corresponding to a first grayscale value among the plurality of grayscale values; Determining a fourth brightness value corresponding to a second grayscale value other than the first grayscale value among the plurality of grayscale values ​​based on a set gamma curve and the third brightness value; The first brightness value is determined according to the third brightness value and the fourth brightness value.

4. The display control method according to claim 2, characterized in that: Determining a plurality of modulation parameter combinations based on the plurality of grayscale values ​​comprises: Determine a first count value corresponding to the grayscale value in a first control mode, and a second count value corresponding to the grayscale value in a second control mode; constructing a second mapping table based on the grayscale value, the first count value and the second count value; Dividing the plurality of grayscale values ​​into a plurality of grayscale value intervals, and determining a target control mode for each grayscale value interval, the target control mode being the first control mode or the second control mode; The count value interval corresponding to the target control mode is determined according to the second mapping table to obtain a plurality of the modulation parameter combinations.

5. The display control method according to claim 4, characterized in that: The determining, according to the second mapping table, a count value interval corresponding to the target control mode to obtain a plurality of modulation parameter combinations includes: If the target control mode is the first control mode, determining a first count value interval corresponding to the grayscale value interval according to the second mapping table, and determining the second count value of the second control mode in the grayscale value interval as a third count value; determining a first modulation parameter combination according to the third count value and each of the first count values ​​in the first count value interval; If the target control mode is the second control mode, determining a second count value interval corresponding to the grayscale value interval according to the second mapping table, and determining the first count value of the first control mode in the grayscale value interval as a fourth count value; determining a second modulation parameter combination according to the fourth count value and each of the second count values ​​in the second count value interval; A plurality of modulation parameter combinations are obtained based on the first modulation parameter combination and the second modulation parameter combination.

6. The display control method according to claim 4, characterized in that: The dividing the plurality of grayscale values ​​into a plurality of grayscale value intervals and determining a target control mode for each grayscale value interval includes: Dividing the plurality of grayscale values ​​into a first interval and a second interval, wherein the grayscale value of the first interval is greater than the grayscale value of the second interval; The target control mode of the first interval is determined as the first control mode, and the target control mode of the second interval is determined as the second control mode; or, the target control mode of the first interval is determined as the second control mode, and the target control mode of the second interval is determined as the first control mode.

7. The display control method according to claim 4, characterized in that: The dividing the plurality of grayscale values ​​into a plurality of grayscale value intervals and determining a target control mode for each grayscale value interval includes: Dividing the plurality of grayscale values ​​into a third interval, a fourth interval and a fifth interval, the grayscale value of the third interval being greater than the grayscale value of the fourth interval, and the grayscale value of the fourth interval being greater than the grayscale value of the fifth interval; The target control mode in the third section and the fifth section is determined as the first control mode, and the target control mode in the fourth section is determined as the second control mode.

8. The display control method according to any one of claims 1 to 7, characterized in that: Outputting a driving current to a light-emitting unit of a display panel according to the target mapping data to control the display brightness of the display panel includes: Determine a first driving current corresponding to the first target modulation parameter according to a third mapping table; Determine a second driving current corresponding to the second target modulation parameter according to a fourth mapping table; Determine the driving current of the light emitting unit corresponding to each of the pixels according to the first driving current and the second driving current; The driving current is output to each light emitting unit based on the driving sequence of each display pixel of the display panel to control the display brightness of the display panel.

9. A display control device, characterized in that: include: An acquisition module, used for receiving input image information and acquiring a target grayscale value of each pixel in the image information; A determination module, configured to match target mapping data in a first mapping table according to each target grayscale value, wherein the target mapping data includes a first target modulation parameter of a first control mode and a second target modulation parameter of a second control mode; A control module, configured to output a driving current to a light-emitting unit of a display panel according to the target mapping data, so as to control the display brightness of the display panel; The first control mode is to control the amplitude of the driving current, and the second control mode is to control the pulse width of the driving current.

10. A display device, characterized in that: The display control device according to claim 9, wherein the display device comprises: Display panel; a memory configured to store instructions; and A processor is configured to call the instructions from the memory and implement the display control method according to any one of claims 1 to 8 when executing the instructions.

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