Display device and method for controlling brightness of display device

Abstract

The present application provides a display device and a method for controlling the brightness of a display device. The display device includes: a power supply, a controller, a first driving unit, and a light-emitting unit; the power supply is connected to the first driving unit, the controller, and the light-emitting unit, respectively; one end of the light-emitting unit is connected to the power supply, and the other end of the light-emitting unit is connected to the first driving unit; the controller is connected to the first driving unit; the controller is configured to: receive an image signal, determine an initial brightness signal, a field rate signal frequency, and an average grayscale value corresponding to the image signal; determine a compensation value for the initial brightness signal based on the initial brightness signal, the field rate signal frequency, and the average grayscale value; and the first driving unit drives the light-emitting unit to emit light based on a signal obtained by superimposing the initial brightness signal and the compensation value. By superimposing the compensation value on the initial brightness signal when controlling the backlight of the display device, the display device is in VRR mode, so that even if the field rate signal frequency changes too quickly, the resulting change will not be noticeable to the human eye.

Description

Technical Field

[0001] The present application relates to the field of display, and in particular to a display device and a method for controlling the brightness of the display device. Background Art

[0002] Currently, to ensure that when display devices play video images with a fixed frame rate, the screen will not experience screen delays, freezes, or tearing due to inconsistencies between the display device's field frequency signal and the input image frame rate, a variable refresh rate technology has been introduced. This technology continuously adjusts the field frequency signal to keep the display device's field frequency signal frequency consistent with the image frame rate, thereby avoiding screen tearing or freezes on the display device. For example, for game videos, the screen output by the game console is usually frame-locked, and the frame rates of different games vary, which can easily cause screen tearing on the display device. The variable refresh rate (VRR) can avoid screen tearing by adjusting the display refresh rate (i.e., the field frequency signal frequency).

[0003] However, under a variable refresh rate, for liquid crystal display devices, the brightness of the image displayed on the display panel is different under field frequency signals of different frequencies. If the frequency of the field frequency signal changes more drastically, the brightness of the image on the display panel will change more significantly, and the display device will flicker, affecting the user experience.

[0004] Therefore, it is necessary to provide a display device to solve the problem of screen flickering when the display device is in a variable refresh rate mode. Summary of the Invention

[0005] The present application provides a display device and a method for controlling the brightness of the display device, which are used to solve the screen flickering problem caused by drastic changes in the frequency of the field frequency signal of the display device in a variable refresh rate mode in the related art.

[0006] In a first aspect, the present application provides a display device, comprising: a power supply, a controller, a first driving unit, and a light-emitting unit; wherein,

[0007] The power supply is connected to the first driving unit, the controller and the light-emitting unit respectively; the power supply is used to provide power supply signals to the first driving unit, the controller and the light-emitting unit; one end of the light-emitting unit is connected to the power supply, and the other end of the light-emitting unit is connected to the first driving unit; the controller is connected to the first driving unit;

[0008] The controller is configured to:

[0009] Receive an image signal, and determine an initial brightness signal, a field rate signal frequency, and an average grayscale value of a display panel in a display device corresponding to the image signal;

[0010] determining a compensation value of the initial brightness signal according to the initial brightness signal, the field rate signal frequency, and the average grayscale value;

[0011] The first driving unit is configured to drive the light-emitting unit to emit light based on a signal obtained by superimposing the initial brightness signal and a compensation value of the initial brightness signal.

[0012] In some embodiments, the controller is specifically configured as follows:

[0013] Determining a preset grayscale value of a grayscale interval corresponding to the average grayscale value;

[0014] A compensation value of the initial brightness signal is determined according to the preset grayscale value, the initial brightness signal, and the field rate signal frequency.

[0015] In some embodiments, the controller is further configured to:

[0016] Determining a preset field frequency signal frequency in a field frequency interval corresponding to the field frequency signal frequency;

[0017] The controller is specifically configured to determine a compensation value corresponding to the initial brightness signal according to the preset field rate signal frequency, the initial brightness signal, and the preset grayscale value.

[0018] In some embodiments, the light emitting unit includes a plurality of light zones; the display panel includes a plurality of display subareas; the light zones correspond one-to-one to the display subareas; and the controller is specifically configured as follows:

[0019] Receive image signals and determine the initial brightness signal, field rate signal frequency and average grayscale value of each display partition corresponding to each light zone;

[0020] Determining a compensation value for each initial brightness signal according to the field signal frequency, the initial brightness signal corresponding to each light zone, and the average grayscale value of each display partition;

[0021] The multiple initial brightness signals sent by the controller and the multiple signals corresponding to and superimposed on the multiple compensation values ​​sent by the controller drive each lamp area in the light-emitting unit to emit light.

[0022] In some embodiments, the first driving unit includes: a microprocessor, a driving controller;

[0023] The microprocessor is configured to determine a composite signal based on the initial brightness signal and the compensation value, and to analyze the composite signal to obtain a analyzed signal;

[0024] The driving controller is used to generate a driving signal to drive the light-emitting unit to emit light according to the analyzed signal sent by the microprocessor.

[0025] In some embodiments, the controller is specifically configured as follows: if it is determined that the dimming method of the light-emitting unit is analog dimming, the current value determined based on the image signal is used as the initial brightness signal; if it is determined that the dimming method of the light-emitting unit is PWM dimming, the PWM value determined based on the image signal is used as the initial brightness signal.

[0026] In some embodiments, the display device further includes: a liquid crystal module and a second driving unit;

[0027] The second driving unit is configured to control parameters of the liquid crystal module based on a control signal determined by the controller according to the image signal, so that the display panel displays an image.

[0028] In a second aspect, the present application provides a method for controlling the brightness of a display device, which is applied to a controller in the display device according to the first aspect, the method comprising:

[0029] The controller receives an image signal and determines an initial brightness signal, a field rate signal frequency, and an average grayscale value of a display panel in a display device corresponding to the image signal;

[0030] The controller determines a compensation value of the initial brightness signal according to the initial brightness signal, the field rate signal frequency and the average grayscale value;

[0031] The first driving unit drives the light emitting unit to emit light based on the initial brightness signal and the compensation value.

[0032] In some embodiments, the controller determines the compensation value of the initial brightness signal according to the initial brightness signal, the field rate signal frequency, and the average grayscale value, including:

[0033] The controller determines a preset grayscale value of a grayscale interval corresponding to the average grayscale value;

[0034] The controller determines a compensation value of the initial brightness signal according to the preset grayscale value, the initial brightness signal, and the field rate signal frequency.

[0035] In some embodiments, the method further comprises:

[0036] The controller determines a preset field frequency signal frequency in a field frequency interval corresponding to the field frequency signal frequency;

[0037] The controller determines the compensation value of the initial brightness signal according to the initial brightness signal, the preset grayscale value, and the field rate signal frequency, including:

[0038] The controller determines a compensation value corresponding to the initial brightness signal according to the preset field rate signal frequency, the initial brightness signal, and the preset grayscale value.

[0039] In some embodiments, the controller determines the compensation value of the initial brightness signal according to the initial brightness signal, the field rate signal frequency, and the average grayscale value, including:

[0040] The controller determines a preset grayscale value of a grayscale interval corresponding to the average grayscale value;

[0041] The controller determines a compensation value of the initial brightness signal according to the preset grayscale value, the initial brightness signal, and the field rate signal frequency.

[0042] In some embodiments, the method further comprises:

[0043] The controller determines a preset field frequency signal frequency in a field frequency interval corresponding to the field frequency signal frequency;

[0044] The controller determines a compensation value of the initial brightness signal according to the initial brightness signal, the preset grayscale value, and the field rate signal frequency, including:

[0045] The controller determines a compensation value corresponding to the initial brightness signal according to the preset field rate signal frequency, the initial brightness signal, and the preset grayscale value.

[0046] In some embodiments, the controller receives an image signal and determines an initial brightness signal, a field rate signal frequency, and an average grayscale value of a display panel in a display device corresponding to the image signal, including:

[0047] The controller receives the image signal and determines the initial brightness signal corresponding to each light zone, the field frequency signal frequency and the average grayscale value of each display partition;

[0048] The controller determines a compensation value of the initial brightness signal according to the field rate signal frequency, the initial brightness signal and the average grayscale value, including:

[0049] The controller determines the compensation value of each initial brightness signal according to the frequency of the field signal, the initial brightness signal corresponding to each light zone, and the average grayscale value of each display partition;

[0050] The first driving unit drives the light emitting unit to emit light based on the initial brightness signal and the compensation value, including:

[0051] The first driving unit drives each lamp area in the light-emitting unit to emit light based on the multiple initial brightness signals and the multiple signals corresponding to and superimposed on the multiple compensation values.

[0052] In some embodiments, the first driving unit drives the light-emitting unit to emit light based on the initial brightness signal and the compensation value, including:

[0053] The first driving unit determines a composite signal according to the initial brightness signal and the compensation value, and analyzes the composite signal to obtain a analyzed signal;

[0054] The first driving unit generates a driving signal according to the analyzed signal to drive the light emitting unit to emit light.

[0055] In some embodiments, determining the initial brightness signal corresponding to the image signal includes:

[0056] If the dimming mode of the light emitting unit is determined to be analog dimming, the current value determined based on the image signal is used as the initial brightness signal; if the dimming mode of the light emitting unit is determined to be PWM dimming, the PWM value determined based on the image signal is used as the initial brightness signal.

[0057] In some embodiments, the display device further includes a second driving unit and a liquid crystal module. The method further includes the second driving unit controlling parameters of the liquid crystal module based on a control signal determined according to the image signal, so that the display panel displays an image.

[0058] The present application provides a display device and a method for controlling the brightness of a display device, wherein the display device includes: a power supply, a controller, a first driving unit and a light-emitting unit; wherein the power supply is connected to the first driving unit, the controller and the light-emitting unit respectively; the power supply is used to provide a power supply signal to the first driving unit, the controller and the light-emitting unit; one end of the light-emitting unit is connected to the power supply, and the other end of the light-emitting unit is connected to the first driving unit; the controller is connected to the first driving unit; the controller is configured to: receive an image signal, determine an initial brightness signal, a field rate signal frequency and an average grayscale value of a display panel in a display device corresponding to the image signal; determine a compensation value of the initial brightness signal based on the initial brightness signal, the field rate signal frequency and the average grayscale value; the first driving unit is used to drive the light-emitting unit to emit light based on a signal obtained by superimposing the initial brightness signal and the compensation value of the initial brightness signal. By superimposing a compensation value on the original initial brightness signal when controlling the backlight of the display device, and then controlling the above-mentioned superimposed signal, even in VRR mode, even if the field frequency signal changes too quickly, the change in brightness between different field frequency signals will not be perceived by the human eye, thereby avoiding the problem of display device flickering caused by too fast a change in field frequency signal frequency. BRIEF DESCRIPTION OF THE DRAWINGS

[0059] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0060] Figure 1 A schematic structural diagram of a display device provided in this application;

[0061] Figure 2 This is an equivalent schematic diagram of a liquid crystal control circuit provided in this application;

[0062] Figure 3 A schematic diagram of brightness change of a display device provided in this application;

[0063] Figure 4 A schematic structural diagram of a display device provided in an embodiment of the present application;

[0064] Figure 5 A schematic diagram of brightness change of another display device provided in an embodiment of the present application;

[0065] Figure 6 A schematic diagram of a grayscale value division method provided in an embodiment of the present application;

[0066] Figure 7 A schematic structural diagram of another display device provided in an embodiment of the present application;

[0067] Figure 8 A schematic structural diagram of another display device provided for the implementation of this application;

[0068] Figure 9 A schematic flow chart of a first method for controlling the brightness of a display device provided in an embodiment of the present application;

[0069] Figure 10 A schematic flow chart of a second method for controlling the brightness of a display device provided in an embodiment of the present application;

[0070] Figure 11 A schematic flow chart of a third method for controlling the brightness of a display device provided in an embodiment of the present application;

[0071] Figure 12 This is a flow chart of a fourth method for controlling the brightness of a display device provided in an embodiment of the present application.

[0072] The above drawings illustrate specific embodiments of the present application, which will be described in more detail below. These drawings and the textual description are not intended to limit the scope of the present application in any way, but rather to illustrate the concepts of the present application to those skilled in the art by reference to specific embodiments. DETAILED DESCRIPTION

[0073] Exemplary embodiments will be described in detail herein, with examples illustrated in the accompanying drawings. In the following description, when referring to the drawings, identical numerals in different figures represent identical or similar elements, unless otherwise indicated. The embodiments described in the following exemplary embodiments are not intended to represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present application, as detailed in the appended claims.

[0074] At present, with the development of information technology, various display devices have been widely used to facilitate people to obtain information.

[0075] Typically, a display device includes a power board, a driver board, a light-emitting element, and a controller. The power board supplies power to the driver board, the light-emitting element, and the controller. The controller receives image signals from an external server or transmitted via optical fiber, processes the image signals, generates drive signals, and sends these signals to the driver board, which drives the light-emitting element to emit light.

[0076] In some examples, Figure 1 For example, Figure 1This is a schematic diagram of the structure of a display device provided in the present application. In the figure, the driver board may include a first driver board and a second driver board. The first driver board is connected to the light-emitting element and is used to drive the light-emitting element to emit light based on a brightness signal in a drive signal sent by a controller. The second driver board is used to control the transmittance of the liquid crystal in the liquid crystal module based on a control signal in the drive signal sent by the controller, so that the light emitted by the light-emitting element passes through the various polarizers and liquid crystal layer in the liquid crystal module to display the final image on the display panel.

[0077] In some examples, the controller may be a SOC (System on Chip) disposed on a motherboard.

[0078] Figure 2 The present application provides an equivalent schematic diagram of a liquid crystal control circuit, wherein the control circuit includes a switch tube, a capacitor and a liquid crystal unit. In addition, a display device includes a plurality of the above control circuits arranged in an array. When displaying an image, the switch tube of each row is first turned on, and then the voltage on each liquid crystal unit in the row is controlled through column driving. Afterwards, the above control is performed row by row. In the display device, the transmittance of the liquid crystal unit can be controlled by controlling the magnitude of the voltage loaded on the liquid crystal unit. Specifically, when the display device is working, each time the image displayed by the display panel is refreshed, the charge on the capacitor in parallel with the liquid crystal unit is lost once along the turned-on switch tube, and then the voltage value at both ends of the liquid crystal unit will decrease. As the voltage value at both ends of the liquid crystal unit decreases, the angle of liquid crystal deflection will also decrease, and then the light that the light-emitting element can pass through the liquid crystal unit will also decrease, resulting in a decrease in the brightness of the display panel. The slower the display screen is updated, the lower the frequency of the corresponding field frequency signal of the display device, and the more charge in the corresponding control circuit is lost through the switch tube. Therefore, the brightness displayed by the display panel is different under different field frequency signal frequencies. Figure 3 As shown, Figure 3 This is a schematic diagram of brightness changes in a display device provided by this application. In the diagram, the horizontal axis represents the field rate signal frequency, and the vertical axis represents the brightness value. As can be seen, the higher the field rate signal frequency, the higher the displayed brightness. When the field rate signal frequency in a display device changes dramatically, the display brightness also changes dramatically, causing the display device screen to flicker, affecting the user experience.

[0079] The display device and the method for controlling the brightness of the display device provided in this application are intended to solve the above technical problems.

[0080] The following specific embodiments describe in detail the technical solution of the present application and how the technical solution of the present application solves the above-mentioned technical problems. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments. The embodiments of the present application will be described below in conjunction with the accompanying drawings.

[0081] Figure 4 This is a schematic diagram of the structure of a display device provided in an embodiment of the present application. Figure 4 As shown, the display device includes: a power supply, a controller, a first driving unit, and a light-emitting unit; the power supply is connected to the first driving unit, the controller, and the light-emitting unit respectively, for providing power supply signals to the first driving unit, the controller, and the light-emitting unit; one end of the light-emitting unit is connected to the power supply, and the other end of the light-emitting unit is connected to the first driving unit; the controller is connected to the first driving unit;

[0082] The controller is configured to receive an image signal and determine an initial brightness signal, a field rate signal frequency, and an average grayscale value of a display panel in a display device corresponding to the image signal; and determine a compensation value of the initial brightness signal based on the initial brightness signal, the field rate signal frequency, and the average grayscale value.

[0083] The first driving unit is configured to drive the light-emitting unit to emit light based on the initial brightness signal and the signal obtained by superimposing the compensation value.

[0084] For example, through experimental comparison, it is found that under different grayscale values, the brightness corresponding to the same field rate signal frequency is also different. Figure 5 This is another schematic diagram of brightness change of a display device provided in an embodiment of the present application. Figure 3 and Figure 5 It can be found that under the same field signal frequency, the display device brightness corresponding to different grayscale values ​​is also different. Therefore, to avoid the problem of display screen flickering caused by drastic changes in the field signal frequency, this embodiment superimposes a compensation signal on the initial brightness signal originally controlling the light-emitting element. This compensation signal is determined by the field signal frequency and grayscale value. The superimposed signal is then used to control the light-emitting element to avoid the problem of screen flickering when the frequency changes rapidly. The display device in this embodiment includes a power supply, a controller, and a light-emitting element. The power supply is used to supply power to the controller and the light-emitting element respectively.

[0085] The controller is used to receive externally input image signals. For example, this image signal can be transmitted to the display device via a wired method (such as optical fiber), obtained from a built-in or external storage unit, or obtained via a network. After receiving the image signal, the controller analyzes it to obtain an initial brightness signal of the image signal and detects the average grayscale value and vertical frequency of the display panel in the current display device.

[0086] In one example, when detecting the average grayscale value of a display panel in a display device, the average grayscale value of an externally input image signal can be directly used as the average grayscale value of the display panel. In another example, it can also be the average grayscale value obtained after a control unit such as a timing controller in the display device corrects the grayscale value of an externally input image signal. No specific restrictions are made here.

[0087] In addition, the controller is further configured to determine a compensation value corresponding to the initial brightness signal according to the determined initial brightness signal, the field rate signal frequency, and the average grayscale value.

[0088] In one example, a display device pre-stores multiple sets of compensation values ​​corresponding to initial brightness signals, field rate signal frequencies, and average grayscale values. For example, a set of initial brightness signals, field rate signal frequency values, and average grayscale values ​​corresponds to one compensation value. The controller can query the corresponding compensation value based on the stored field rate signal frequency, average grayscale value, and initial brightness signal.

[0089] In one example, the display device may pre-store the correspondence between the field rate signal frequency, the average grayscale value, the initial brightness signal, and the compensation value, such as a fitted functional relationship, and then calculate the corresponding compensation value based on the pre-stored correspondence, the field rate signal frequency, and the average grayscale value.

[0090] The first driving unit is configured to drive the light-emitting unit to emit light based on a signal obtained by superimposing an initial brightness signal sent by the controller and a compensation signal.

[0091] In one example, the display device may use analog dimming. If analog dimming is used, the controller may use the current signal corresponding to the image signal as the initial brightness signal, thereby enabling the third driving unit to control the brightness of the light-emitting element by controlling the current of the light-emitting element.

[0092] In one example, a display device may employ PWM (Pulse Width Modulation) dimming. If using analog dimming, the controller may use a PWM signal corresponding to an image signal as the initial brightness signal. The third driver unit then controls the brightness of the light-emitting element using the amplitude and duty cycle of the PWM signal.

[0093] In one example, when the display device can control the light-emitting unit by analog dimming or PWM dimming, the controller can determine the dimming mode currently adopted by the display device, and then determine the initial signal brightness. In one possible way, the controller can determine the current dimming mode based on the user's instruction to select the dimming mode. In addition, for a display device that has two dimming modes at the same time, the display device also needs to pre-store the correspondence between the initial brightness signal, compensation value, field frequency signal frequency and average grayscale value under the two dimming modes. For the PWM dimming mode, the compensation value at this time is the change value of the PWM signal, while for the analog dimming mode, the compensation value at this time is the current value.

[0094] In this embodiment, in order to avoid the problem of screen flickering caused by the rapid change of the field frequency signal frequency in the variable refresh rate mode of the display device, a compensation value is superimposed on the original initial brightness signal when controlling the backlight of the display device. The compensation value is determined by the initial brightness signal, the average grayscale value and the field frequency signal frequency. Then, through the control of the above-mentioned superimposed signal, even if the field frequency signal frequency of the display device changes too quickly, the change in brightness between different field frequency signals will not be perceived by the human eye, thereby avoiding the problem of display device flickering caused by the rapid change of the field frequency signal frequency.

[0095] In some embodiments, the controller determines the compensation value of the initial brightness signal according to the initial brightness signal, the field rate signal frequency, and the average grayscale value, specifically for:

[0096] First, the controller determines a preset grayscale value of a grayscale interval corresponding to the average grayscale value; then, the controller determines a compensation value of the initial brightness signal according to the initial brightness signal, the preset grayscale value, and the field signal frequency.

[0097] For example, in this embodiment, when determining the compensation value, the compensation value of the initial brightness signal can be determined based on the determined initial brightness signal, the grayscale interval in which the average grayscale is located, and the field frequency signal frequency. Typically, the grayscale value of the display panel is 256 values ​​ranging from 0 to 255. When determining the compensation value, the compensation value corresponding to each initial brightness signal, grayscale value, and field frequency signal frequency can be pre-determined. However, in order to reduce the amount of data stored in the display device and avoid the complexity caused by the large amount of data during the query process, in this embodiment, the 256 grayscale values ​​0-255 can be divided into several grayscale intervals, and the pre-selected grayscale value in each grayscale interval is used as the final grayscale value. Furthermore, each grayscale value can find a preset grayscale value through the grayscale interval in which it is located, and then the compensation value is determined based on the preset grayscale value, the initial brightness signal, and the field frequency signal frequency.

[0098] For example, the grayscale value can be divided into three parts in advance. Figure 6 A schematic diagram of a grayscale value division method provided in an embodiment of the present application. The first part is [0, 80], the second part is (80, 150], and the third part is (150, 255]. In the second part, the grayscale value of 128 can be selected as the preset grayscale for the pixel interval. Subsequently, if the determined average grayscale value is in the second part, the compensation value can be directly determined based on the grayscale value 128 and the field signal frequency. In this way, in each grayscale interval, only one compensation value corresponding to the grayscale value, the remaining field signal frequencies, and the initial brightness signal needs to be pre-determined and stored, thereby reducing the amount of data stored and the complexity of subsequently determining the compensation value. It should be noted that when dividing the grayscale intervals, it is necessary to ensure that the preset grayscale values ​​in adjacent grayscale intervals have a brightness change of the display panel after compensation that is less than the brightness change that can be distinguished by the human eye at the same field signal frequency value. It should be noted that in this embodiment, when dividing the grayscale intervals, the number of grayscales included in each grayscale interval can be the same or different, and the number of grayscale intervals ultimately obtained by division is not specifically limited.

[0099] In this embodiment, in order to reduce the complexity of determining the compensation signal, the grayscale can be divided into multiple grayscale intervals in advance, and a preset grayscale value is set in each grayscale interval. Then, the current preset grayscale value and the compensation value corresponding to the field frequency signal frequency can be searched or calculated in the pre-stored data based on the preset grayscale value of the grayscale interval corresponding to the average grayscale value, the field frequency signal frequency, and the initial brightness signal, thereby reducing the amount of pre-stored data.

[0100] In some embodiments, to determine the compensation value, the controller is further configured to determine a preset field rate signal frequency in a field rate interval corresponding to the field rate signal frequency. The controller then further determines the compensation value for the initial brightness signal based on the preset grayscale value, the initial brightness signal, and the preset field rate signal frequency.

[0101] For example, from Figure 3 As can be seen from the figure, the relationship between the field signal frequency and the display panel brightness satisfies the condition that the lower the frequency, the lower the brightness. Since the field signal frequency is a continuous data, in order to further reduce the complexity of determining the compensation value, the field signal frequency can be divided into multiple value intervals, and a preset field signal frequency is selected in each value interval. The controller can then determine the compensation value based on the preset grayscale value and the preset field signal frequency. For example, after obtaining the field signal frequency, the field signal frequency can be directly rounded to an integer, and the rounded value can be used as the preset field signal frequency.

[0102] Specifically, in actual application, the grayscale value can be pre-divided into three parts, the first part [0, 80], the second part (80, 150], and the third part (150, 255). For the first part, since the brightness of the display panel corresponding to this grayscale is relatively dim, the human eye cannot clearly distinguish the brightness change at this time. Therefore, it is possible to consider not making compensation at this time, that is, setting the compensation value to 0. For the second part, 128 can be selected as the preset grayscale value. For the third part, 255 can be selected as the preset grayscale value. As for the field frequency signal frequency, here, taking the field frequency signal frequency variation range of the display device as 40Hz-60Hz as an example, an even value within this interval can be selected as the preset field frequency signal frequency. In the range [40Hz, 41Hz), the preset field frequency signal frequency is set to 40Hz; in the range [41Hz, 43Hz), the preset field frequency signal frequency is set to 42Hz; in the range [43Hz, 45Hz), the preset field frequency signal frequency is set to 44Hz, and so on.

[0103] In this embodiment, to reduce the complexity of determining compensation values, multiple field frequency intervals are pre-set based on the grayscale division into multiple grayscale intervals. After determining the field frequency signal frequency, the field frequency interval corresponding to that field frequency signal frequency is directly determined. Subsequently, the corresponding compensation value is determined based on the determined initial field frequency signal, the preset field frequency signal frequency corresponding to the field frequency interval, and the preset grayscale value. Consequently, when storing the corresponding relationships, only the corresponding relationships between each preset field frequency signal frequency, preset grayscale value, initial field frequency signal, and compensation value need to be stored, reducing the amount of stored data and the complexity of determining the compensation value.

[0104] In one possible implementation, when PWM dimming is used, since the PWM value generated based on the image signal is constantly changing, even if the grayscale value and the field rate signal frequency of the display device do not change, the compensation values ​​corresponding to different PWM values ​​will also be different. Taking the following Table 1 as an example, when PWM dimming is used, under the condition that the grayscale and field rate frequency are fixed, it is necessary to store multiple sets of different PWM normal values ​​(in this case, values ​​obtained based on the image) and the compensation values ​​corresponding to each normal value.

[0105] Therefore, to reduce storage space, this embodiment further provides a dimming method that combines PWM dimming with analog dimming, using a fixed PWM value. Consequently, for the same grayscale and vertical signal frequency, only one compensation value corresponding to a normal PWM value needs to be stored. This dimming method and storage method are described in detail below.

[0106] When adjusting the backlight of a display device, the initial brightness signal generated based on the image signal can include both a PWM value and a current value (where the PWM value is used to control the switch connected to the light-emitting unit, and the current value is the current supplied to the light-emitting element). That is, dimming is performed using a combination of PWM dimming and analog dimming. In this case, the PWM value can be set to a fixed value, while the current value can be set to a variable value. The brightness of the light-emitting element can be changed by adjusting the current value. In this case, the problem of screen flickering in the display device can still be corrected by adding a compensation value to the fixed PWM value.

[0107] Table 1 is an example of the correspondence between the preset field rate signal frequencies and the compensation values ​​when the grayscale is 128, wherein the normal PWM value is the fixed value mentioned above, and the final PWM value is the sum of the normal PWM value and the compensation value.

[0108] Table 1

[0109]

[0110] Table 2 shows an example of the correspondence between the preset field rate signal frequencies and the compensation values ​​when the grayscale is 255, where the normal PWM value is the initial brightness value determined by the controller according to the image signal, and the final PWM value is the sum of the normal PWM value and the compensation value.

[0111] Table 2

[0112]

[0113] In order to obtain the PWM compensation value in the above table, at this time, the correspondence between the field signal frequency and the first brightness value of the display device when the compensation value is not added can be obtained when the grayscale is 255. Then, in order to avoid the flickering problem when the field signal frequency changes too quickly, a preset brightness value can be set for each field signal frequency, and the preset brightness values ​​between different field signal frequencies are the same or similar, thereby ensuring that the human eye cannot detect screen flickering when the field signal frequency changes. Afterwards, for each field signal frequency, calculate the percentage of the difference between the first brightness value and the preset brightness value at the field signal frequency as a percentage of the first brightness value, and then multiply the percentage by a fixed value to obtain the compensation value corresponding to the field frequency. Then, by combining analog dimming with PWM dimming and fixing the PWM value, the storage space occupied by the above table can be reduced.

[0114] In some embodiments, a display device may employ local dimming technology to adjust the overall image displayed by the display panel by adjusting the image in each region. Specifically, the light-emitting unit in the display device includes multiple light zones; the display panel in the display device also includes multiple display sub-areas, and the light zones correspond one to one with the display sub-areas.

[0115] For example, an embodiment of the present application provides a display device with two display partitions. The display device includes a panel 1, a backlight assembly 2 (i.e., a light-emitting unit), a mainboard 3, a rear housing 5, and a base 6. The panel 1 is used to present images to the user, and the backlight assembly 2 is located below the panel 1. It is usually an optical component that is used to provide sufficient brightness and uniform distribution of light so that the panel 1 can display images normally.

[0116] In some embodiments, the panel 1 is composed of a first panel 11 for a first display screen and a second panel 12 for a second display screen (i.e., the display panel is divided into two display partitions). The backlight assembly 2 is composed of a first backlight assembly 21 for the first display screen and a second backlight assembly 22 for the second display screen. The content displayed on the two display screens is independent of each other, and both are controlled by the mainboard 3.

[0117] In particular, the display device is provided with a first power board 4 (main power board) and a second power board 7 (auxiliary power board). The first power board 4 is used to supply power to the main board 3 and the first backlight component 21, and the second power board 7 is used to supply power to the second backlight component 22.

[0118] In some embodiments, the first backlight assembly 21 also includes a backplane 20, the main board 3 and the first power board 4 are arranged on the backplane 20, and some convex structures are usually stamped on the backplane 20, and the main board 3 and the power board 4 are fixed to the convex structures by screws or hooks; the second backlight assembly 22 may also include a backplane, and the second power board 7 is arranged on the backplane of the second backlight assembly 22.

[0119] In addition, the rear shell 5 is covered on the panel 1 to hide the components of the display device such as the first backlight assembly 21, the second backlight assembly 22, the main board 3, the first power board 4 and the second power board 7, thereby achieving an aesthetic effect; the base 6 is used to support the display device.

[0120] Specifically, when a display device includes multiple display partitions, a controller in the display device is configured to receive an image signal and determine an initial brightness signal, a vertical frequency signal, and an average grayscale value for each display partition corresponding to each lighting zone. Exemplarily, after receiving the image signal, the controller divides the image signal into regions according to a preset lighting zone division method. Then, the controller performs image analysis on the image in each region to determine an initial brightness signal, an average grayscale value, and a vertical frequency signal for each display partition corresponding to each lighting zone. There is a one-to-one correspondence between the display partitions and the lighting zones.

[0121] In some embodiments, the controller determines a compensation value for each initial brightness signal based on the field rate signal frequency, the initial brightness signal of each display partition, and the average grayscale value of each display partition. Subsequently, the first driving unit can drive each light zone in the light-emitting unit to emit light based on the multiple initial brightness signals and the multiple compensation values ​​determined by the controller. In one example, upon receiving multiple initial brightness signals and multiple compensation values, the first driving unit can determine the corresponding relationship between the initial brightness signals and the compensation values ​​based on the light zone labels added to the initial brightness signals and the compensation values, and then drive the corresponding light zone to emit light after the corresponding superposition.

[0122] In this embodiment, local dimming technology is combined when controlling the backlight of the display device. By compensating the initial brightness signal corresponding to each partition, compared with the above-mentioned direct compensation of the initial brightness signal corresponding to the entire image signal, the compensation method in this embodiment can achieve more accurate backlight compensation and avoid the problem of screen flickering caused by drastic changes in the frequency of the field rate signal.

[0123] In some embodiments, Figure 7 This is a schematic diagram of the structure of another display device provided in an embodiment of the present application. Figure 4 Based on the structure shown, the first driving unit in the display device includes: a microprocessor, a driving controller;

[0124] The microprocessor is configured to determine a composite signal based on the initial brightness signal and the compensation value determined by the controller, and then analyze the composite signal to obtain a analyzed signal. The driver controller is configured to generate a drive signal based on the analyzed signal sent by the microprocessor to drive the light-emitting unit to emit light. In one example, when the driver controller drives the light-emitting unit to emit light, the brightness of the light-emitting unit can be adjusted by controlling the on / off frequency of a switch connected to the light-emitting unit.

[0125] In practical applications, a display device typically includes a mainboard and a driver board, and the controller can be a control chip provided on the mainboard. The first driver unit can be provided on the driver board. In some examples, a processing program corresponding to determining the compensation value of the initial brightness signal based on the initial brightness signal, the field signal frequency, and the average grayscale value can be integrated into a microprocessor within the first driver unit, with the microprocessor performing the operation of determining the compensation value. For example, a table of data corresponding to the pre-set compensation value, field signal frequency, and grayscale value can be stored in a register within the microprocessor, and the microprocessor can query and obtain the compensation value. In other examples, considering the low computing power of the microprocessor on the driver board, the processing program for determining the compensation value can be provided on the mainboard, with the mainboard determining the compensation value. The microprocessor in the driver board then performs superposition processing of the initial brightness signal and the compensation value, or the microprocessor in the driver board directly receives the composite value after superposition processing by the mainboard. When the mainboard determines the compensation value, it can be determined based on the correspondence between the compensation value, field signal frequency, and grayscale value pre-stored in a memory built into the mainboard, or it can be obtained from other memory outside the mainboard.

[0126] Furthermore, the microprocessors on the main board and the driver board may communicate using a preset I2C (Inter-Integrated Circuit) or SPI (Serial Peripheral Interface), which is not specifically limited here.

[0127] In some embodiments, Figure 8 A schematic diagram of another display device provided for the implementation of this application, in Figure 7 On the basis of, the display device further includes: a liquid crystal module and a second driving unit; the second driving unit is used to control the liquid crystal module parameters based on the control signal determined by the controller according to the image signal, so that the display panel displays the image.

[0128] For example, when a display device displays an image, the light emitted by the light-emitting unit in the display device needs to pass through a liquid crystal module composed of multiple optical elements before the final image can be displayed on the display panel. For example, when the liquid crystal of the liquid crystal module is not deflected, the light emitted by the light-emitting unit cannot pass through the liquid crystal module, and ultimately the image cannot be displayed on the display panel. Therefore, the controller in the display device will also generate a control signal based on the image signal, so that the second drive unit can control the parameters of the liquid crystal module based on the control signal, such as controlling the gate drive signal and data signal of the transistor corresponding to the liquid crystal pixel in the liquid crystal module to control the deflection angle of the liquid crystal pixel, and then control the transmittance of the liquid crystal pixel. Here, for the control process of the liquid crystal module, please refer to the implementation method in the relevant technology, which will not be repeated here.

[0129] Figure 9 A flow chart of a first method for controlling the brightness of a display device provided in an embodiment of the present application, which is applied to Figure 4 The display device shown in FIG. 1 comprises the following steps:

[0130] S101, a controller receives an image signal and determines an initial brightness signal, a field rate signal frequency, and an average grayscale value of a display panel in a display device corresponding to the image signal;

[0131] S102, the controller determines a compensation value of the initial brightness signal according to the initial brightness signal, the field rate signal frequency and the average grayscale value;

[0132] S103: The first driving unit drives the light-emitting unit to emit light based on the initial brightness signal and the signal obtained by superimposing the compensation value.

[0133] The method provided in this embodiment can refer to the solution description on the corresponding device side. Its implementation principle and technical effects are similar and will not be repeated here.

[0134] Figure 10 The flowchart of the second method for controlling the brightness of a display device provided in an embodiment of the present application is shown in the figure. As shown in the figure, the method includes the following steps:

[0135] S201, a controller receives an image signal and determines an initial brightness signal, a field rate signal frequency, and an average grayscale value of a display panel in a display device corresponding to the image signal;

[0136] S202, the controller determines a preset grayscale value of a grayscale interval corresponding to the average grayscale value;

[0137] S203, the controller determines a compensation value of the initial brightness signal according to the initial brightness signal, the preset grayscale value, and the field rate signal frequency;

[0138] S204: The first driving unit drives the light-emitting unit to emit light based on the initial brightness signal and the signal obtained by superimposing the compensation value.

[0139] Figure 11 A flow chart of a third method for controlling the brightness of a display device provided in an embodiment of the present application is shown in the figure. The method includes the following steps:

[0140] S301, a controller receives an image signal and determines an initial brightness signal, a field rate signal frequency, and an average grayscale value of a display panel in a display device corresponding to the image signal;

[0141] S302, the controller determines a preset grayscale value of a grayscale interval corresponding to the average grayscale value;

[0142] S303, the controller determines a preset field frequency signal frequency in a field frequency interval corresponding to the field frequency signal frequency;

[0143] S304: The controller determines a compensation value corresponding to the initial brightness signal according to the initial brightness signal, the preset field rate signal frequency, and the preset grayscale value;

[0144] S305 : The first driving unit drives the light-emitting unit to emit light based on the initial brightness signal and the signal obtained by superimposing the compensation value.

[0145] The method provided in this embodiment can refer to the solution description on the corresponding device side. Its implementation principle and technical effects are similar and will not be repeated here.

[0146] Figure 12 This is a flow chart of a fourth method for controlling the brightness of a display device provided in an embodiment of the present application. When the light-emitting unit in the display device is divided into multiple light zones, the controller in the display device may adopt the method shown in the figure when driving the light-emitting unit. The method includes the following steps:

[0147] S401: The controller receives an image signal and determines an initial brightness signal corresponding to each light zone, a field frequency signal frequency, and an average grayscale value of each display partition;

[0148] S402, the controller determines a compensation value for each initial brightness signal according to the field signal frequency, the initial brightness signal corresponding to each light zone, and the average grayscale value of each display partition;

[0149] S403: The first driving unit drives each lamp area in the light-emitting unit to emit light based on the multiple initial brightness signals and the multiple signals corresponding to and superimposed on the multiple compensation values.

[0150] In some embodiments, the first driving unit includes: a microprocessor and a driving controller. When executing step S103, it can be specifically implemented by the following steps:

[0151] The microprocessor determines a composite signal according to the initial brightness signal and the compensation value, and analyzes the composite signal to obtain a analyzed signal; the driving controller generates a driving signal according to the analyzed signal to drive the light-emitting unit to emit light.

[0152] In some embodiments, the display device has two dimming modes. At this time, if the controller in the display device determines that the dimming mode of the light-emitting unit is analog dimming, the current value determined based on the image signal is used as the initial brightness signal; if the dimming mode of the light-emitting unit is determined to be PWM dimming, the PWM value determined based on the image signal is used as the initial brightness signal.

[0153] In some embodiments, the display device also includes a second driving unit and a liquid crystal module. Based on any of the above-mentioned methods for controlling the brightness of the display device, the control method also includes: the second driving unit controls the liquid crystal module parameters based on a control signal determined according to the image signal so that the display panel displays an image.

[0154] The device provided in this embodiment is used to implement the technical solution provided by the above method. Its implementation principle and technical effects are similar and will not be described in detail.

[0155] Those skilled in the art will readily appreciate other embodiments of the present invention after considering the specification and practicing the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the present invention that follow the general principles of the present invention and include common knowledge or customary techniques in the art not disclosed herein. The description and examples are to be considered merely as exemplary, and the true scope and spirit of the present application are indicated by the appended claims.

[0156] It should be understood that the present application is not limited to the exact structure described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present application is limited only by the appended claims.

Claims

1. A display device, characterized in that: include: A power supply, a controller, a first driving unit and a light emitting unit; wherein, The power supply is connected to the first driving unit, the controller and the light-emitting unit respectively; the power supply is used to provide power supply signals to the first driving unit, the controller and the light-emitting unit; one end of the light-emitting unit is connected to the power supply, and the other end of the light-emitting unit is connected to the first driving unit; the controller is connected to the first driving unit; The controller is configured to: Receive an image signal, and determine an initial brightness signal, a field rate signal frequency, and an average grayscale value of a display panel in a display device corresponding to the image signal; Determining the grayscale interval into which the average grayscale value falls among the plurality of grayscale intervals, and determining the preset grayscale value corresponding to the grayscale interval as the preset grayscale value corresponding to the average grayscale value; wherein the plurality of grayscale intervals are obtained by pre-dividing the grayscale values, and the preset grayscale value corresponding to each grayscale interval is a grayscale value selected from the grayscale interval; determining a compensation value of the initial brightness signal according to the preset grayscale value, the initial brightness signal, and the field rate signal frequency; The first driving unit is configured to drive the light emitting unit to emit light using a superimposed signal obtained by superimposing the initial brightness signal with a compensation value based on the initial brightness signal.

2. The display device according to claim 1, wherein The controller is further configured to: Determining a preset field frequency signal frequency in a field frequency interval corresponding to the field frequency signal frequency; The controller is specifically configured to determine a compensation value corresponding to the initial brightness signal according to the preset field rate signal frequency, the initial brightness signal, and the preset grayscale value.

3. The display device according to claim 1, wherein The light-emitting unit includes a plurality of light zones; the display panel includes a plurality of display subareas; the light zones correspond to the display subareas in a one-to-one manner; and the controller is specifically configured as follows: Receive image signals and determine the initial brightness signal, field rate signal frequency and average grayscale value of each display partition corresponding to each light zone; Determining a compensation value for each initial brightness signal according to the field signal frequency, the initial brightness signal corresponding to each light zone, and the average grayscale value of each display partition; The multiple initial brightness signals sent by the controller and the multiple signals corresponding to and superimposed on the multiple compensation values ​​sent by the controller drive each lamp area in the light-emitting unit to emit light.

4. The display device according to claim 1, wherein The first driving unit includes: a microprocessor and a driving controller; The microprocessor is configured to determine a composite signal based on the initial brightness signal and the compensation value, and to analyze the composite signal to obtain a analyzed signal; The driving controller is used to generate a driving signal to drive the light-emitting unit to emit light according to the analyzed signal sent by the microprocessor.

5. The display device according to claim 1, wherein The controller is specifically configured as follows: if it is determined that the dimming mode of the light-emitting unit is analog dimming, the current value determined based on the image signal is used as the initial brightness signal; if it is determined that the dimming mode of the light-emitting unit is PWM dimming, the PWM value determined based on the image signal is used as the initial brightness signal.

6. The display device according to claim 1, wherein The display device further includes: a liquid crystal module and a second driving unit; The second driving unit is configured to control parameters of the liquid crystal module based on a control signal determined by the controller according to the image signal, so that the display panel displays an image.

7. A method for controlling the brightness of a display device, characterized in that: Applied to the display device according to claim 1, the method comprises: The controller receives an image signal and determines an initial brightness signal, a field rate signal frequency, and an average grayscale value of a display panel in a display device corresponding to the image signal; Determining the grayscale interval into which the average grayscale value falls among the plurality of grayscale intervals; and determining the preset grayscale value corresponding to the grayscale interval as the preset grayscale value corresponding to the average grayscale value; wherein the plurality of grayscale intervals are obtained by pre-dividing the grayscale values, and the preset grayscale value corresponding to each grayscale interval is a grayscale value selected from the grayscale interval; The controller determines a compensation value of the initial brightness signal according to the preset grayscale value, the initial brightness signal, and the field rate signal frequency; The first driving unit drives the light emitting unit to emit light using a superimposed signal obtained by superimposing the initial brightness signal with a compensation value based on the initial brightness signal.

8. The control method according to claim 7, characterized in that: The method further comprises: The controller determines a preset field frequency signal frequency in a field frequency interval corresponding to the field frequency signal frequency; The controller determines the compensation value of the initial brightness signal according to the initial brightness signal, the preset grayscale value and the field rate signal frequency, including: the controller determines the compensation value corresponding to the initial brightness signal according to the preset field rate signal frequency, the initial brightness signal and the preset grayscale value.

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