Display brightness control circuit, method and display device

Abstract

The application belongs to the technical field of display, and particularly relates to a display brightness control circuit, method and display device. The method comprises the following steps: receiving a frame skipping signal, determining a scanning position on a display screen corresponding to a scanning signal according to the frame skipping signal, the scanning signal being used for scanning pictures in a video signal to the display screen in a preset order, and the frame skipping signal being used for indicating whether the video signal is abnormal; judging whether the scanning position belongs to a preset control area, and if the scanning position belongs to the preset control area, determining brightness step information of the display screen; obtaining a first control instruction based on the brightness step information, and controlling the luminous brightness of a backlight source through the first control instruction, the first control instruction being used for controlling the brightness of the backlight source according to the brightness step information. The application can improve the display effect when a display picture is abnormal.

Description

Technical Field

[0001] The present application belongs to the field of display technology, and specifically relates to a display brightness control circuit, method and display device. Background Art

[0002] When the video signal is interfered with, the display screen will display an abnormal picture. When the abnormality occurs, the display screen will be controlled to skip frames, not display the abnormal picture, and the operating voltage of the pixel unit of the display screen will be latched to maintain the normal picture until the next frame.

[0003] During the latching process of the operating voltage, the display screen will experience a slow linear discharge phenomenon in low-brightness images, resulting in a decrease in image brightness. When the pixel unit is restored to charge in the next frame, the image brightness returns to normal. The large brightness difference between the previous and next images creates a flickering visual effect. Summary of the Invention

[0004] The purpose of the present application is to provide a display brightness control circuit, method and display device to reduce flickering of the display screen and improve the screen effect during crosstalk.

[0005] An embodiment of the present application provides a display brightness control circuit, comprising a light emitting module, the light emitting module being disposed on one side of a display module, the light emitting module comprising at least two light emitting units;

[0006] A micro control unit, configured to receive a scanning signal and a brightness adjustment signal;

[0007] a first driving unit, connected to the light-emitting module and the microcontroller unit, and configured to control the light-emitting module to operate in a first backlight mode according to the scanning signal, wherein the first backlight mode is to control the light-emitting module to operate according to a scanning sequence indicated by the scanning signal, wherein the scanning sequence corresponds to an arrangement order of the light-emitting units in the light-emitting module;

[0008] A second driving unit, the second driving unit is connected to the light-emitting module and the micro control unit, and is used to control the light-emitting module to operate in a second backlight mode according to the brightness adjustment signal. The second backlight mode refers to controlling each light-emitting unit in the light-emitting module to operate in different brightness.

[0009] In one embodiment of the present application, the light emitting module includes a first light emitting unit, a second light emitting unit, and a third light emitting unit;

[0010] The first driving unit is connected in parallel with the first end of the first light-emitting unit, the first end of the second light-emitting unit, and the first end of the third light-emitting unit through a first control switch;

[0011] The second driving unit is respectively connected to the first end of the first light-emitting unit, the first end of the second light-emitting unit, and the first end of the third light-emitting unit through a second control switch;

[0012] The second end of the first light emitting unit, the second end of the second light emitting unit, and the second end of the third light emitting unit are connected to a control end between the first driving unit and the second driving unit.

[0013] In one embodiment of the present application, the second end of the first light emitting unit is connected to the first control end between the first driving unit and the second driving unit;

[0014] The second end of the second light emitting unit is connected to the second control end between the first driving unit and the second driving unit;

[0015] The second end of the third light emitting unit is connected to the third control end between the first driving unit and the second driving unit;

[0016] The first control end enables the first light emitting unit to operate at a first operating voltage, the second control end enables the second light emitting unit to operate at a second operating voltage, and the third control end enables the third light emitting unit to operate at a third operating voltage.

[0017] In one embodiment of the present application, the connection line between the second control switch and the first light-emitting unit is larger than the connection line between the second control switch and the second light-emitting unit;

[0018] A connection line between the second control switch and the second light-emitting unit is larger than a connection line between the second control switch and the third light-emitting unit.

[0019] An embodiment of the present application provides a display brightness control method, which is applied to the display brightness control circuit provided in the above embodiment. The method includes:

[0020] receiving a frame skip signal, and determining a scanning position on a display screen corresponding to a scanning signal according to the frame skip signal, wherein the scanning signal is used to scan frames in a video signal onto the display screen in a preset order, and the frame skip signal is used to indicate whether an abnormality occurs in the video signal;

[0021] determining whether the scanning position belongs to a preset control area, and if the scanning position belongs to the preset control area, determining brightness step information of the display screen, wherein the brightness step information is used to indicate brightness changes of the display screen;

[0022] Based on the brightness step information, a first control instruction is acquired, and the light emitting brightness of the backlight source is controlled by the first control instruction, wherein the first control instruction is used to control the brightness of the backlight source according to the brightness step information.

[0023] An embodiment of the present application provides a display device, the display device including the display brightness control circuit provided by the above embodiment;

[0024] The controller is used to execute the display brightness control method provided in the above embodiment.

[0025] The present application provides a display brightness control circuit, wherein a light-emitting module is arranged on one side of the display module and includes at least two light-emitting units; a microcontroller unit is used to receive a scanning signal and a brightness adjustment signal; a first driving unit is connected to the light-emitting module and is used to control the light-emitting module to operate in a first backlight mode, and the first backlight mode enables the light-emitting module to control the light-emitting units in the light-emitting module to operate in the order of the scanning signal; a second driving unit is connected to the light-emitting module and is used to control the light-emitting module to operate in a second backlight mode according to the brightness adjustment signal, and the second backlight mode enables each light-emitting unit in the light-emitting module to operate at a different brightness. When the scanning signal is abnormal, each light-emitting unit in the light-emitting module operates at a different brightness, compensating for the brightness during the abnormality, and avoiding a large difference between the brightness when the scanning signal is normal and the brightness in the abnormal state, which causes a visual flickering effect.

[0026] Other features and advantages of the present application will become apparent from the following detailed description, or may be learned in part by practice of the present application.

[0027] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The accompanying drawings are incorporated into and constitute a part of the specification, illustrate embodiments consistent with the present application, and together with the specification, are used to explain the principles of the present application. Obviously, the drawings described below are only some embodiments of the present application, and those skilled in the art can derive other drawings based on these drawings without inventive effort.

[0029] Figure 1 FIG. 4 shows a schematic diagram of the circuit structure of the display brightness control circuit provided in this embodiment.

[0030] Figure 2 FIG. 4 shows a schematic structural diagram of a display brightness control circuit provided in this embodiment.

[0031] Figure 3 A flow chart of a display brightness control method according to an embodiment of the present application is shown.

[0032] Figure 4 A schematic flow chart of the display brightness control method provided in this embodiment is shown when it is applied to a display brightness control circuit.

[0033] Description of reference numerals:

[0034] The light emitting module 110 , the micro control unit 120 , the first driving unit 130 , the second driving unit 140 , the first control switch SW1 , the second control switch SW2 , the first light emitting unit 111 , the second light emitting unit 112 , and the third light emitting unit 113 . DETAILED DESCRIPTION

[0035] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in many forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this application will be thorough and complete and will fully convey the concepts of the example embodiments to those skilled in the art.

[0036] In addition, described feature, structure or characteristic can be combined in one or more embodiments in any suitable manner.In the following description, many specific details are provided so as to provide a full understanding of the embodiments of the present application. However, it will be appreciated by those skilled in the art that the technical scheme of the present application can be put into practice without one or more of the specific details, or other methods, components, devices, steps etc. can be adopted. In other cases, known methods, devices, implementations or operations are not shown or described in detail to avoid blurring the various aspects of the application.

[0037] The block diagrams shown in the accompanying drawings are merely functional entities and do not necessarily correspond to physically separate entities. That is, these functional entities may be implemented in software, in one or more hardware modules or integrated circuits, or in different networks and / or processor devices and / or microcontroller devices.

[0038] The flowcharts shown in the accompanying drawings are for illustrative purposes only and do not necessarily include all contents and operations / steps, nor must they be executed in the order described. For example, some operations / steps may be decomposed, while others may be combined or partially combined. Therefore, the actual execution order may vary depending on the actual situation.

[0039] During high-speed transmission, video signals from liquid crystal modules (LCMs) are susceptible to interference from electrostatic discharge (ESD) and electromagnetic radiation, leading to display anomalies. When video signal data is abnormal, the display device is controlled to skip frames. Frame skipping occurs when data within a frame is abnormal. Instead, the LCD panel latches the display to the normal operating voltage, maintaining the current display until the next frame resumes.

[0040] Existing TFT (Thin Film Transistor) display panels may not be able to latch voltage in low-brightness images. Due to the material characteristics, slow linear leakage will occur, and the leakage will cause obvious changes in the display brightness. When the next frame of data returns to normal, the display panel's luminance returns to normal. The brightness difference before and after is large, giving people a flickering visual effect.

[0041] Generally, local dimming is configured or the display material is changed, such as LTPS or IGZO, etc. Changing the display material or display processing will increase the cost, and in some display devices without local dimming, the flicker effect caused by frame skipping cannot be improved.

[0042] Example 1

[0043] An embodiment of the present application provides a display brightness control circuit. Figure 1 FIG. 4 shows a schematic diagram of the circuit structure of the display brightness control circuit provided in this embodiment.

[0044] like Figure 1 As shown, the display brightness control circuit includes:

[0045] A light emitting module 110 is provided on one side of the display module and includes at least two light emitting units;

[0046] A micro control unit 120, the micro control unit 120 is used to receive a scanning signal and a brightness adjustment signal;

[0047] a first driving unit 130, which is connected to the light-emitting module 110 and the microcontroller unit 120 and is used to control the light-emitting module 110 to operate in a first backlight mode according to the scanning signal. The first backlight mode refers to controlling the light-emitting module 110 to operate according to a scanning sequence indicated by the scanning signal. The scanning sequence corresponds to the arrangement order of the light-emitting units in the light-emitting module 110;

[0048] The second driving unit 140 is connected to the light emitting module 110 and the micro control unit 120, and is used to control the light emitting module 110 to operate in a second backlight mode according to the brightness adjustment signal. The second backlight mode refers to controlling each light emitting unit in the light emitting module 110 to operate at different brightness.

[0049] Specifically, the light emitting module 110 is used to generate light to provide light for the display module. The light emitting module 110 is disposed on one side of the display module and includes at least two light emitting units.

[0050] Each light emitting unit is arranged in a first direction.

[0051] The micro control unit 120 is connected to the first driving unit 130 and the second driving unit 140 and is used to selectively control the operation of the first driving unit 130 or the second driving unit 140 according to the received scanning signal and brightness adjustment signal.

[0052] The first driving unit 130 and the second driving unit 140 are both connected to the light emitting module 110 and are used to control the light emitting module 110 to operate in different backlight modes.

[0053] The first driving unit 130 controls the light emitting module 110 to operate in a first backlight mode according to the scanning signal. The first backlight mode controls the light emitting module 110 to operate according to the scanning sequence indicated by the scanning signal. The scanning signal is used to display an image on the display panel. Images of different brightness require different backlight brightness. When the scanning signal is normal, the operating brightness of the light emitting unit in the light emitting module 110 should correspond to the brightness of the image on the display.

[0054] The second driving unit 140 controls the light emitting module 110 to operate in the second backlight mode according to the brightness adjustment signal. The second backlight mode means that each light emitting unit operates at a different brightness.

[0055] The brightness adjustment signal is a signal used to control the display panel to skip frames when an abnormality occurs in the scanning signal.

[0056] Signal anomalies may occur at any time in any frame. When a data signal anomaly occurs, the scanning area of ​​the scanning signal will also be different. When frame skipping occurs in different scanning areas, the picture performance will be different.

[0057] Understandably, the higher the scanning area, the more pixels involved in latching, the greater the parasitic capacitance and resistance generated, the more severe the panel leakage, and the darker the screen brightness. Furthermore, each frame is scanned from top to bottom. Pixels located at the top can be charged immediately, while those located at the bottom have to wait longer to charge, resulting in more leakage. At low brightness levels, the overall screen will darken gradually from top to bottom.

[0058] Exemplarily, the scanning area of ​​the display screen is divided into three parts according to the vertical area from top to bottom. When scanning the upper area, the leakage phenomenon is most serious, and the discharge is faster, resulting in the darkest overall picture. When scanning the middle area, the leakage phenomenon is less than that in the upper area, but there are more parasitic capacitance and parasitic resistance, and the operating voltage of the pixel unit gradually decreases, at this time the brightness of the picture becomes darker. When scanning the lower area, frame skipping occurs. At this time, there are fewer pixel units involved in latching, and the display screen can maintain the brightness of the picture before the frame skip. After the frame skip ends, the brightness difference before and after is not obvious.

[0059] The second driving unit 140 can cause the light-emitting units in the light-emitting module 110 to operate at different brightness levels. When frame skipping occurs, the light-emitting units in the light-emitting module 110 can operate at different brightness levels based on the different scanning areas of the scanning signal, resulting in a gradient dimming effect on the screen. Optionally, the brightness of the light-emitting units in the light-emitting module 110 can be gradually brightened or dimmed along the first direction.

[0060] The existing display mode is generally to scan and display from top to bottom, and provide operating voltages to pixel units in the display module in a corresponding order.

[0061] Illustratively, this embodiment is applied to a liquid crystal display device, the light emitting module 110 is a backlight source, and the display module is composed of a transistor array and a liquid crystal layer.

[0062] The light emitting module 110 is installed on one side of the display module in a side-entry installation manner, that is, the light emitting module 110 is installed on the side of the liquid crystal panel, and the light refracted by the light guide plate passes through the liquid crystal layer for display.

[0063] In this embodiment, the light emitting module 110 includes at least two light emitting units, and the light emitting units are arranged in a first direction.

[0064] The number of light-emitting units can be set according to the brightness change gradient requirements of the display panel. For example, if the brightness change gradient is 6 levels, then the number of light-emitting units is set to 6; if the brightness change gradient is 3 levels, then the number of light-emitting units is set to 3.

[0065] When the micro control unit 120 receives the brightness adjustment signal, it transmits the brightness adjustment signal to the second driving unit 140 . The second driving unit 140 controls each light emitting unit in the light emitting module 110 to operate at different brightness based on the connection mode of each light emitting unit.

[0066] Specifically, the second driving unit 140 adjusts the operating voltage of each light-emitting unit so that the brightness of each light-emitting unit is different.

[0067] In this embodiment, the light-emitting module 110 includes at least two light-emitting units, and the microcontroller unit 120 receives a scanning signal and a brightness adjustment signal. The scanning signal and the brightness adjustment signal are used to drive the first driving unit 130 and the second driving unit 140 respectively. The first driving unit 130 and the second driving unit 140 are used to control the operation of the light-emitting module 110 according to different backlight modes. When an abnormality occurs in the scanning signal, the display panel is controlled to skip frames. At this time, the light-emitting module 110 needs to adjust the brightness to compensate for the brightness of the display panel to avoid the brightness difference between the front and back of the display panel being too obvious after the next frame scanning signal is restored, which visually causes flickering and affects the display effect. The light-emitting module 110 is controlled by the second driving unit 140 to work at different brightnesses and to provide fill light when an abnormality occurs in the display panel. When applied to non-self-luminous display screens, flickering can be avoided and the display effect can be improved.

[0068] Example 2

[0069] On the basis of the first embodiment, the light emitting module 110 includes a first light emitting unit 111 , a second light emitting unit 112 and a third light emitting unit 113 ;

[0070] The first driving unit 130 is connected in parallel to the first end of the first light emitting unit 111, the first end of the second light emitting unit 112, and the first end of the third light emitting unit 113 through the first control switch SW1;

[0071] The second driving unit 140 is connected to the first end of the first light emitting unit 111, the first end of the second light emitting unit 112, and the first end of the third light emitting unit 113 respectively through the second control switch SW2;

[0072] The second end of the first light emitting unit 111 , the second end of the second light emitting unit 112 , and the second end of the third light emitting unit 113 are connected to the control end between the first driving unit 130 and the second driving unit 140 .

[0073] In this embodiment, the light emitting module 110 includes three light emitting units, namely a first light emitting unit 111 , a second light emitting unit 112 and a third light emitting unit 113 .

[0074] Figure 2 FIG. 4 shows a schematic structural diagram of a display brightness control circuit provided in this embodiment.

[0075] like Figure 2 As shown, the first driving unit 130 is connected to the light emitting module 110 through the first control switch SW1 , and the first control switch SW1 is connected to the light emitting module 110 and is connected in parallel with the first light emitting unit 111 , the second light emitting unit 112 and the third light emitting unit 113 through a main path.

[0076] The second driving unit 140 is connected to the light emitting module 110 through the second control switch SW2 , and is respectively connected to the first light emitting unit 111 , the second light emitting unit 112 , and the third light emitting unit 113 through three wires.

[0077] Optionally, each light-emitting unit is composed of several LED lights. The topmost light-emitting unit is the first light-emitting unit 111. If the circuit length between the first light-emitting unit 111 and the second control switch SW2 is L1, the corresponding resistor of the circuit is R1. Below the first light-emitting unit 111 is the second light-emitting unit 112. The circuit length between the second light-emitting unit 112 and the second control switch SW2 is L2, and the corresponding resistor is R2. Below the second light-emitting unit 112 is the third light-emitting unit 113. The circuit length between the third light-emitting unit 113 and the second control switch SW2 is L3, and the corresponding resistor is R3.

[0078] The relationship between the lengths of the circuits connected between the three and the second control switch SW2 is: L1>L2>L3, and the relationship between the sizes of the resistors is: R1>R2>R3.

[0079] The second control switch SW2 separates the forward power supply, and each forward power supply is connected to each light-emitting unit respectively. The path length of each forward power supply is different. The longer the path is, the greater the impedance is.

[0080] In order to make each light-emitting unit work at different brightness, a different working voltage is allocated to each channel so that the brightness presented during operation is different.

[0081] For example, the voltage range for operating an LED lamp is 2.8V-3.55V. The operating voltage of the LED lamp of the first light-emitting unit 111 is set to 3.3V. The power path between the first light-emitting unit 111 and the second control switch SW2 is called path one, and the voltage on path one is 9.9V. The power path between the second light-emitting unit 112 and the second control switch SW2 is called path two. The operating voltage of the LED lamp of the second light-emitting unit 112 is set to 3.4V, and the voltage on path two is 10.2V. The power path between the third light-emitting unit 113 and the second control switch SW2 is called path three. The operating voltage of the LED lamp of the third light-emitting unit 113 is set to 3.5V, and the voltage on path three is 10.3V.

[0082] The operating voltage on each path is different, and the corresponding light-emitting unit circuit is different. The brightness of the first light-emitting unit 111 is brightness 1, the second light-emitting unit 112 is brightness 2, and the third light-emitting unit 113 is brightness 3, where brightness 3 > brightness 2 > brightness 1. If the first light-emitting unit 111, the second light-emitting unit 112, and the third light-emitting unit 113 are arranged from top to bottom, the brightness of each light-emitting unit increases in sequence.

[0083] On the display screen, if frame skipping occurs, the scanning area of ​​the scanning signal on the display screen is different, and the overall brightness of the display screen is also different, and the overall brightness decreases from top to bottom. In order to ensure that the brightness of the display screen before and after frame skipping is not much different, the brightness of each light-emitting unit is increased in sequence.

[0084] Specifically, the first driving unit 130 and the second driving unit 140 may be LED driving chips, and the micro control unit 120 may be an MCU module, and the operation of the LED driving chips is controlled by the MCU module.

[0085] In one embodiment, the second end of the first light emitting unit 111 is connected to the first control end between the first driving unit 130 and the second driving unit 140;

[0086] The second end of the second light emitting unit 112 is connected to the second control end between the first driving unit 130 and the second driving unit 140;

[0087] The second end of the third light emitting unit 113 is connected to the third control end between the first driving unit 130 and the second driving unit 140;

[0088] The first control terminal enables the first light emitting unit 111 to operate at a first operating voltage, the second control terminal enables the second light emitting unit 112 to operate at a second operating voltage, and the third control terminal enables the third light emitting unit 113 to operate at a third operating voltage.

[0089] Specifically, the micro control unit 120 is connected to the display driver chip and is used to receive a scan signal and a frame skip signal sent by the display driver chip. The frame skip signal is also a brightness adjustment signal.

[0090] When the micro control unit 120 receives the scanning signal, it controls the first driving unit 130 to operate. At this time, the first control switch SW1 is closed and the second control switch SW2 is opened.

[0091] When the micro control unit 120 receives the frame skipping signal, ie, the brightness adjustment signal, it controls the second driving unit 140 to operate. At this time, the second control switch SW2 is closed, and the first control switch SW1 is opened.

[0092] Specifically, the first driving unit 130 is connected to the second driving unit 140, and the second driving unit 140 is connected to the microcontroller unit 120. The microcontroller unit 120 is connected to the second driving unit 140 via a bus protocol. Optionally, the microcontroller unit 120 stores multiple sets of brightness control codes. Depending on the scanning area of ​​the scanning signal when frame skipping occurs, the corresponding brightness control code can be sent to the second driving unit 140 to control the light-emitting module 110 to operate according to the operating voltage indicated by the brightness control code.

[0093] The first control end of the first drive unit 130 is connected to the first control end of the second drive unit 140 , the second control end of the first drive unit 130 is connected to the second control end of the second drive unit 140 , and the third control end of the first drive unit 130 is connected to the third control end of the second drive unit 140 .

[0094] The first control end is connected to the second end of the first light-emitting unit 111, and the first end of the first light-emitting unit 111 is connected to the first control switch SW1 and the second control switch SW2; the second control end is connected to the second end of the second light-emitting unit 112, and the first end of the second light-emitting unit 112 is connected to the first control switch SW1 and the second control switch SW2; the third control end is connected to the second end of the third light-emitting unit 113, and the first end of the third light-emitting unit 113 is connected to the first control switch SW1 and the second control switch SW2.

[0095] Furthermore, the micro control unit 120 is connected to the first control switch SW1 and the second control switch SW2 .

[0096] In one embodiment, the connection line between the second control switch SW2 and the first light emitting unit 111 is larger than the connection line between the second control switch SW2 and the second light emitting unit 112 ;

[0097] The connection line between the second control switch SW2 and the second light emitting unit 112 is larger than the connection line between the second control switch SW2 and the third light emitting unit 113 .

[0098] Specifically, the second control switch SW2 is connected to the first light emitting unit 111 , the second light emitting unit 112 and the third light emitting unit 113 respectively, and the connection distance between the two is related to the position of each light emitting unit.

[0099] Taking a plane as an example, the second control switch SW2 is at the bottom and the first light emitting unit 111 is at the top, so the distance between the second control switch SW2 and the first light emitting unit 111 is the farthest.

[0100] The first light-emitting unit 111, the second light-emitting unit 112, and the third light-emitting unit 113 are arranged sequentially in a first direction, which is from top to bottom. Therefore, the second light-emitting unit 112 is located below the first light-emitting unit 111, and the distance between the second control switch SW2 and the second light-emitting unit 112 is shorter than the distance between the second control switch SW2 and the first light-emitting unit 111. The third light-emitting unit 113 is located below the second light-emitting unit 112, and the distance between the third light-emitting unit 113 and the second control switch SW2 is shorter than the distance between the second light-emitting unit 112 and the second control switch SW2.

[0101] Example 3

[0102] This embodiment provides a display brightness control method, which is applied to the display brightness control circuit provided in the above embodiment.

[0103] Figure 3 A schematic flow chart of the display brightness control method provided in this embodiment is shown.

[0104] like Figure 3 As shown, the display brightness control method provided in this embodiment includes:

[0105] S310, receiving a frame skip signal, and determining a scanning position on the display screen corresponding to a scanning signal based on the frame skip signal, wherein the scanning signal is used to scan frames in the video signal onto the display screen in a preset order, and the frame skip signal is used to indicate whether an abnormality occurs in the video signal;

[0106] Specifically, the scanning position on the display screen corresponding to the scanning signal is determined according to the time node when the frame skipping signal is received.

[0107] The scan signal is used to scan the video signal onto the display screen in a preset order. For example, the preset order can be from top to bottom. The frame skip signal indicates whether the video signal is abnormal. When an abnormality occurs, the display screen is controlled to skip frames. During the frame skipping process, the voltage of the pixel cells in the display screen is latched.

[0108] If signal interference occurs during the video signal transmission of a frame of data, causing the video signal to be abnormal, the abnormal image will not be transmitted in the current frame, and the control will maintain the normal image voltage to maintain the display until the next frame is restored.

[0109] The display area of ​​the display screen is divided into a predetermined number of equal parts, for example, into thirds. The node where the video signal abnormality occurs may be when the scanning signal scans one of the third-divided areas. However, the scanning signal has a timing sequence, and the scanning order of the scanning signal on the display screen is fixed. Therefore, the current scanning position can be determined based on the timing of the scanning signal when the frame skip signal is received.

[0110] S320, determining whether the scanning position belongs to a preset control area. If the scanning position belongs to the preset control area, determining brightness step information of the display screen, where the brightness step information is used to indicate brightness changes of the display screen.

[0111] The function of this embodiment is to reduce the brightness difference of the display screen before and after the video signal is abnormal.

[0112] Specifically, when the frame skip signal is given, the scanning signal scans a certain area of ​​the display screen, and after the voltage of this area is latched, the display brightness does not change significantly. Even after the display screen returns to normal, the brightness difference before and after will not cause a too obvious brightness difference, and no additional brightness control is required.

[0113] First, it is necessary to determine whether the scanning position belongs to the preset control area. If the scanning position belongs to the preset control area, the brightness step information of the display screen is determined.

[0114] The brightness step information is used to indicate the brightness change of the display screen. The brightness change is the brightness change step. For example, if the brightness change step is 6 levels, it means that the brightness of the display screen changes in 6 steps.

[0115] The preset control area refers to the area where the backlight source needs to be controlled to perform brightness compensation according to the preset brightness. If the scanning position is located in the preset control area when frame skipping occurs, the brightness of the display screen changes significantly after the frame skipping is locked, so the brightness of the backlight source needs to be controlled.

[0116] S330: Based on the brightness step information, obtain a first control instruction, and control the light emitting brightness of the backlight source through the first control instruction, where the first control instruction is used to control the brightness of the backlight source according to the brightness step information.

[0117] Specifically, a first control instruction is obtained according to the brightness step information. The first control instruction controls the luminous brightness of the backlight source through a preset current control code. The first control instruction is used to control the brightness of the backlight source according to the brightness step information.

[0118] Exemplarily, the display area of ​​the display screen is divided into three equal areas longitudinally. When the scanning position falls into one of the areas, the corresponding current control code is also different.

[0119] From top to bottom, the display area is divided into a first area, a second area, and a third area. When a frame skip occurs, the scanning position is in the first area, and the overall brightness of the display screen is darker than when the scanning position is in the second area. In this case, the current control code provides a larger current to increase the brightness of the backlight source to compensate for the brightness of the display screen.

[0120] According to the content of the above embodiment, after the frame skipping latch, the brightness of the display screen gradually dims from top to bottom. In order to compensate for the brightness difference, the luminous brightness of the backlight source gradually increases from top to bottom.

[0121] The display brightness control method provided in this embodiment is applied to the display brightness control circuit provided in the above embodiment. After receiving the frame skip signal, the microcontroller unit gives a brightness adjustment signal. At this time, the first control switch is disconnected and the second control switch is closed. The second driving unit outputs the corresponding working current to the light-emitting unit of the light-emitting module through the current control code, so that each light-emitting unit operates at different brightness.

[0122] In this embodiment, the scanning position of the scanning signal on the display screen is determined by the frame skip signal, and it is determined whether the scanning position belongs to the preset control area. If it belongs to the preset control area, the brightness step information of the display screen is determined. The brightness step information is used to indicate the brightness change gradient of the display screen, so that the backlight source can adjust the brightness of the backlight source according to the brightness change gradient to adapt to the change gradient of the display screen, thereby achieving the effect of brightness compensation, avoiding excessive brightness difference after the normal picture display state is restored after the frame skip ends, causing visual flicker.

[0123] In one embodiment, S310, receiving a frame skip signal, and determining a scanning position on a display screen corresponding to a scanning signal according to the frame skip signal, includes:

[0124] S311, obtaining a refresh rate of the display screen, and obtaining the number of level transitions of the scanning signal according to the refresh rate;

[0125] S312: Determine the time difference between the scanning signal and the frame skipping signal according to the number of level jumps, and determine the scanning position on the display screen to which the scanning signal corresponds when the frame skipping signal is received.

[0126] Specifically, the refresh rate of the display screen is obtained, and the scanning signal jumps according to the refresh rate within 1 second.

[0127] For example, the refresh rate of the display screen is 60 Hz, and the level jump number of the scanning signal within 1 second is 60 times.

[0128] The number of level jumps of the scanning signal is counted. When a frame skip signal is given, the interval time between the last transmission of the scanning signal and the giving of the frame skip signal is calculated to determine the scanning position of the scanning signal on the display screen.

[0129] It can be understood that frame skipping occurs within the time of transmitting one frame of data, and the frame time during which frame skipping occurs can be any time during the transmission of the scanning signal.

[0130] Within 1S, the scanning position of the scanning signal on the display screen can be determined according to the number of level jumps of the scanning signal.

[0131] In this embodiment, the scanning position of the scanning signal on the display screen is determined based on the number of level transitions of the scanning signal and the time interval between frame skip signals. Different scanning positions result in different overall brightness of the display screen. First, the brightness change of the display screen is determined based on the scanning position. Subsequently, based on the brightness change of the display screen, the backlight brightness can be controlled to adapt to the brightness of the display screen, thereby improving the display effect.

[0132] In one embodiment, if the scanning position belongs to a preset control area, determining brightness step information of the preset control area at S320 includes:

[0133] S321: Determine a starting position based on the scanning position, and determine an ending position based on a boundary line of a preset control area.

[0134] S322: Determine the brightness change position based on the area between the starting position and the ending position.

[0135] S323: Determine brightness step information based on the brightness change position.

[0136] Specifically, based on the content of the above embodiment, the display area of ​​the display screen is divided into three equal parts. Assuming that the scanning position is located in the first area, the first area belongs to the preset control area, the scanning position is the starting position, and the boundary line between the first area and the second area is the ending position.

[0137] The area between the start position and the end position determines the brightness position change position, the original brightness is maintained from the start position to the beginning position of the first area, and the area after the end position is the brightness compensation area.

[0138] It should be noted that the brightness of the brightness compensation area becomes darker after the frame skipping is latched, and the overall brightness is compensated by adjusting the brightness of the backlight source in the brightness compensation area.

[0139] After determining the brightness change position, the brightness compensation area is determined, and the brightness step information is determined. The brightness step information is used to indicate the brightness gradient of the backlight source.

[0140] It should be noted that the brightness gradient of the backlight source is related to the number of light-emitting units. For example, if there are 6 light-emitting units, the brightness gradient information can be selected to be 6 levels or 3 levels.

[0141] Specifically, each light-emitting unit represents a brightness. When the brightness step information is 6 levels, the brightness changes as brightness 1, brightness 2, brightness 3, brightness 4, brightness 5, and brightness 6, and each light-emitting unit corresponds to a brightness. If the brightness step information is 3 levels, the brightness changes as brightness 1, brightness 2, brightness 3, and every two light-emitting units correspond to a brightness.

[0142] In this embodiment, the brightness change position is determined by scanning the position, and the brightness step information is determined based on the brightness change position. The brightness step information can reflect the brightness change of the display screen, and the brightness of the backlight source is determined based on the brightness change to achieve the effect of brightness compensation.

[0143] In one embodiment, S330, based on the brightness step information, obtaining a first control instruction, and controlling the brightness of the backlight source using the first control instruction, includes:

[0144] S331: Obtain brightness partitions based on brightness step information.

[0145] S332: Control the operating voltage of each brightness partition to change in a step-by-step manner according to a preset sequence through the first control instruction to control the luminous brightness of the backlight source.

[0146] Specifically, brightness partitions are obtained based on the brightness step information. Brightness partitions refer to the division of brightness step changes, such as brightness 1, brightness 2, and brightness 3.

[0147] The first control instruction allocates a different operating current to each brightness subarea, so that each brightness subarea operates at a different brightness.

[0148] In this embodiment, the brightness partition is obtained through the brightness step information, and the first control instruction is used to transmit the corresponding current control code for each brightness partition according to the brightness partition to control the backlight source to emit light according to the gradient. This can compensate for the phenomenon that the display screen darkens in a gradient when the picture is abnormal, reduce the flickering phenomenon caused by the picture abnormality, and improve the display effect to a certain extent.

[0149] In one embodiment, after S330, the method further includes:

[0150] After detecting that the frame skipping signal ends, switching the first control instruction to the second control instruction;

[0151] The backlight source is controlled to emit light according to a second control instruction, and the second control instruction controls the brightness of the backlight source based on the scanning signal.

[0152] In this embodiment, after the frame skipping signal is detected to be finished, the first control instruction is switched to the second control instruction, and the second control instruction controls the brightness of the backlight source according to a default current control code.

[0153] It can be understood that after the frame skip signal ends, it means that the video signal can be transmitted normally. At this time, the role of the backlight source is to emit light so that the picture can be displayed.

[0154] Figure 4 A schematic flow chart of the display brightness control method provided in this embodiment is shown when it is applied to a display brightness control circuit.

[0155] like Figure 4 As shown, first, S410 is executed, and the micro control unit calculates the number of level jumps of the scanning signal;

[0156] S420, determining whether a frame skipping signal is received;

[0157] S430, if there is a frame skip signal, calculating the time interval between the last level jump of the scanning signal and the frame skip signal;

[0158] S440, determining a scanning position of the scanning signal on the display screen according to the time interval, and determining whether the scanning position belongs to a preset control area;

[0159] S450, selecting the corresponding current control code, closing the first control switch, and opening the second control switch;

[0160] S460: The frame skipping signal ends, the first control switch is turned on, and the second control switch is turned off.

[0161] Example 4

[0162] This embodiment provides a display device, which includes the display brightness control circuit provided by the above embodiment;

[0163] The controller is used to execute the display brightness control method provided in the above embodiment.

[0164] The display device provided in this embodiment may be a liquid crystal display, or a display device that does not adopt a mini-LED architecture and is not equipped with an LED driver chip for local dimming.

[0165] By combining the display brightness control circuit with the display brightness control method, when frame skipping occurs on the display screen, the overall brightness of the display screen is adjusted by presenting gradient brightness through the light-emitting module.

[0166] The flowcharts and block diagrams in the accompanying drawings illustrate the possible implementation architecture, functions and operations of the systems, methods and computer program products according to various embodiments of the present application. In this regard, each box in the flowchart or block diagram can represent a module, program segment, or a part of code, and the above-mentioned module, program segment, or a part of code contains one or more executable instructions for realizing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the box can also occur in an order different from that marked in the accompanying drawings. For example, two boxes represented in succession can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each box in the block diagram or flowchart, and the combination of the boxes in the block diagram or flowchart, can be implemented with a dedicated hardware-based system that performs the specified function or operation, or can be implemented with a combination of dedicated hardware and computer instructions.

[0167] It should be noted that, although several modules or units of the device for action execution are mentioned in the above detailed description, this division is not mandatory. In fact, according to the embodiment of the application, the features and functions of two or more modules or units described above can be concretized in one module or unit. On the contrary, the features and functions of one module or unit described above can be further divided into multiple modules or units to be concretized.

[0168] 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 this application and include common knowledge or customary techniques in the art that are not disclosed herein.

[0169] 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 brightness control circuit, characterized in that: include: a light emitting module, the light emitting module being disposed on one side of the display module and comprising at least two light emitting units; A micro control unit, configured to receive a scanning signal and a brightness adjustment signal; a first driving unit, connected to the light-emitting module and the microcontroller unit, and configured to control the light-emitting module to operate in a first backlight mode according to the scanning signal, wherein the first backlight mode is to control the light-emitting module to operate according to a scanning sequence indicated by the scanning signal, wherein the scanning sequence corresponds to an arrangement order of the light-emitting units in the light-emitting module; a second driving unit, connected to the light-emitting module and the microcontroller unit, and configured to control the light-emitting module to operate in a second backlight mode according to the brightness adjustment signal, wherein the second backlight mode is to control each light-emitting unit in the light-emitting module to operate in a different brightness; The brightness adjustment signal is a signal used to control the display panel to skip frames when an abnormality occurs in the scanning signal; When the micro control unit receives the scanning signal, it controls the first driving unit to operate; When the micro control unit receives the brightness adjustment signal, it controls the second driving unit to operate.

2. The display brightness control circuit according to claim 1, wherein: The light emitting module includes a first light emitting unit, a second light emitting unit and a third light emitting unit; The first driving unit is connected to the first end of the first light-emitting unit, the first end of the second light-emitting unit, and the first end of the third light-emitting unit through a first control switch; The second driving unit is respectively connected to the first end of the first light-emitting unit, the first end of the second light-emitting unit, and the first end of the third light-emitting unit through a second control switch; The second end of the first light emitting unit, the second end of the second light emitting unit, and the second end of the third light emitting unit are connected to a control end between the first driving unit and the second driving unit.

3. The display brightness control circuit according to claim 2, wherein: The second end of the first light emitting unit is connected to the first control end between the first driving unit and the second driving unit; The second end of the second light emitting unit is connected to the second control end between the first driving unit and the second driving unit; The second end of the third light emitting unit is connected to the third control end between the first driving unit and the second driving unit; The first control end enables the first light emitting unit to operate at a first operating voltage, the second control end enables the second light emitting unit to operate at a second operating voltage, and the third control end enables the third light emitting unit to operate at a third operating voltage.

4. The display brightness control circuit according to claim 2, wherein: The connection line between the second control switch and the first light-emitting unit is longer than the connection line between the second control switch and the second light-emitting unit; A connection line between the second control switch and the second light-emitting unit is larger than a connection line between the second control switch and the third light-emitting unit.

5. A display brightness control method, characterized in that: Applied to the display brightness control circuit according to any one of claims 1 to 4, the method comprising: receiving a frame skip signal, and determining a scanning position on a display screen corresponding to a scanning signal according to the frame skip signal, wherein the scanning signal is used to scan frames in a video signal onto the display screen in a preset order, and the frame skip signal is used to indicate whether an abnormality occurs in the video signal; determining whether the scanning position belongs to a preset control area, and if the scanning position belongs to the preset control area, determining brightness step information of the display screen, wherein the brightness step information is used to indicate brightness changes of the display screen; Based on the brightness step information, a first control instruction is acquired, and the light emitting brightness of the backlight source is controlled by the first control instruction, wherein the first control instruction is used to control the brightness of the backlight source according to the brightness step information.

6. The display brightness control method according to claim 5, wherein: The receiving the frame skip signal and determining the scanning position on the display screen corresponding to the scanning signal according to the frame skip signal includes: Obtaining a refresh rate of the display screen, and obtaining the number of level transitions of the scanning signal according to the refresh rate; The time difference between the scanning signal and the frame skip signal is determined according to the number of level jumps, and the scanning position on the display screen to which the scanning signal corresponds when the frame skip signal is received is determined.

7. The display brightness control method according to claim 5, wherein: If the scanning position belongs to a preset control area, determining brightness step information of the preset control area includes: Determine a starting position based on the scanning position, and determine an ending position based on a boundary line of the preset control area; determining a brightness change position based on an area between the starting position and the ending position; Brightness step information is determined according to the brightness change position.

8. The display brightness control method according to claim 5, wherein: The acquiring a first control instruction based on the brightness step information, and controlling the light emitting brightness of the backlight source according to the first control instruction, includes: Acquire brightness partitions based on the brightness step information; The first control instruction is used to control the operating voltage of each brightness subarea to change in a step-by-step manner according to a preset sequence, so as to control the luminous brightness of the backlight source.

9. The display brightness control method according to claim 5, wherein: After acquiring a first control instruction based on the brightness step information and controlling the light emitting brightness of the backlight source by using the first control instruction, the method includes: After detecting that the frame skipping signal ends, switching the first control instruction to a second control instruction; The backlight source is controlled to emit light according to a second control instruction, and the second control instruction controls the brightness of the backlight source based on the scanning signal.

10. A display device, characterized in that: A display brightness control circuit comprising the display brightness control circuit according to any one of claims 1 to 4; A controller, configured to execute the display brightness control method according to any one of claims 5 to 9.

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