Liquid crystal display device peeping prevention control method and liquid crystal display device

Abstract

The present application discloses an anti-peep control method for a liquid crystal display device and a liquid crystal display device, the method including the steps of receiving and detecting a screen display signal required for the liquid crystal display device, the screen display signal including a luminance signal and an anti-peep signal, and, when it is detected that the anti-peep signal in the screen display signal is local anti-peep information, controlling a first switching timing of a backlight operating state of a lamp substrate (20) in the liquid crystal display device and a second switching timing of a film operating state of an electrically controlled liquid crystal film (50) to match each other according to the luminance signal, thereby realizing local anti-peep display of the liquid crystal display device.

Description

[Technical Field]

[0001] (CROSS-REFERENCE TO RELATED APPLICATIONS) This application claims priority from a Chinese patent application filed on August 17, 2022, bearing application number 202210984826.0, the entire contents of which are incorporated herein by reference.

[0002] The present invention relates to the field of liquid crystal displays, and more particularly to a method for preventing peeping of a liquid crystal display device and a liquid crystal display device. [Background technology]

[0003] Conventional anti-peeping technologies for LCDs all apply processing to the entire display panel of an LCD display. That is, the entire display panel is controlled to switch between a full-screen anti-peeping state and a non-anti-peeping state as needed. Although this meets the user's needs for state switching, switching the entire display panel between a full-screen anti-peeping state and a non-anti-peeping state limits the user's freedom of control, and the display panel in the full-screen anti-peeping state may consume high power, failing to meet the user's clearly defined needs for anti-peeping. Summary of the Invention [Problem to be solved by the invention]

[0004] The main object of this application is to provide an anti-peeping control method for an LCD display device and an LCD display device, which aim to solve the technical problems of conventional anti-peeping technologies, which can only switch the anti-peeping state for the entire display panel, resulting in low flexibility, high power consumption, and inability to meet the user's clearly defined anti-peeping needs. [Means for solving the problem]

[0005] In order to achieve the above object, the present application provides a method for preventing peeping of a liquid crystal display device, the method comprising: receiving and detecting a screen display signal required for a liquid crystal display device, the screen display signal including a luminance signal and an anti-peeping signal; When it is detected that the anti-peeping signal in the screen display signal is local anti-peeping information, the method includes a step of realizing local anti-peeping display of the liquid crystal display device by controlling the first switching timing of the backlight operating state of the lamp substrate in the liquid crystal display device and the second switching timing of the film operating state of the electrically controlled liquid crystal film to match in accordance with the brightness signal.

[0006] The present application further provides a liquid crystal display device, the liquid crystal display device comprising: a digital system unit for receiving and detecting a screen display signal required for a liquid crystal display device, the screen display signal including a luminance signal and an anti-peeping signal; and a logic control unit that, when it is detected that the anti-peeping signal in the screen display signal is local anti-peeping information, controls the first switching timing of the backlight operating state of the lamp substrate in the liquid crystal display device and the second switching timing of the film operating state of the electrically controlled liquid crystal film to match in accordance with the local anti-peeping information and the brightness signal, thereby realizing local anti-peeping display of the liquid crystal display device.

[0007] (beneficial effects) The present application uses a digital system unit to receive and detect screen display signals required for a liquid crystal display device. When a user's need for localized anti-peeping is detected, the first switching timing of the backlight operating state based on multiple target backlight zones in a lamp substrate and the second switching timing of the film operating state of the electrically controlled liquid crystal film are matched to each other, so that the collimated light emitted by the backlight zone at the first switching timing remains collimated even after passing through the anti-peeping film and the electrically controlled liquid crystal film at the second switching timing. For example, when the film operating state of the electrically controlled liquid crystal film is in a translucent state at the second switching timing, the backlight operating state of the target backlight zone at this time is switched to a lit state at the first switching timing, so that the light emitted after the lamp beads of the target backlight zone are lit remains collimated after passing through the anti-peeping film and the electrically controlled liquid crystal film at the translucent state. This allows only users facing the display panel to see the light source, i.e., only users standing in the center can see the information content on the display panel. This achieves the effect of preventing localized peeping, meets users' demand for localized peeping prevention, enhances the flexibility of peeping prevention technology, and avoids the situation of high power consumption in the full-screen peeping prevention state. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 2 is a terminal structure diagram of a hardware operating environment according to an embodiment of the present application; [Figure 2] 1 is a schematic flowchart of an embodiment of a method for preventing peeping of a liquid crystal display device according to the present invention. [Figure 3] 10 is a schematic diagram of scenarios of what users at different positions see when the target backlight zone changes dynamically. [Figure 4] 10 is a schematic diagram of a step after step S10 in the anti-peeping control method for a liquid crystal display device of the present application. FIG. [Figure 5] 1 is a structural schematic diagram of a liquid crystal display device according to the present invention; [Figure 6] 10 is a schematic diagram showing a state in which incident light emitted from a lamp substrate while it is turned on is collimated through a display panel. FIG. [Figure 7] 10 is a schematic diagram showing a state in which incident light emitted from a lamp substrate while it is turned on is scattered through a display panel. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0009] The realization of the object, function features and advantages of the present invention will be further explained in combination with the embodiments with reference to the accompanying drawings.

[0010] It should be understood that the specific examples described herein are used only to interpret the present application, and are not used to limit the present application.

[0011] The main solution of the embodiments of the present application is to receive and detect the screen display signal required for the liquid crystal display device, and when local anti-peeping information is detected, control the first switching timing of the backlight operating state of the backlight zone and the second switching timing of the film operating state of the electrically controlled liquid crystal film to be compatible according to the brightness signal in the local anti-peeping information, thereby further realizing local anti-peeping display of the liquid crystal display device.

[0012] Conventional anti-peeping technologies for LCDs apply processing to the entire display panel of the LCD display. That is, the entire display panel is controlled to switch between a full-screen anti-peeping state and a non-anti-peeping state as needed. This has the problem of giving the user limited control, and the display panel in the full-screen anti-peeping state can consume high power, so it cannot meet the user's clearly defined needs for anti-peeping.

[0013] This application provides a solution. A digital system unit receives and detects the screen display signals required for the LCD device, and then matches a first switching timing of the backlight operating state based on multiple backlight zones within the lamp substrate with a second switching timing of the film operating state of the electrically controlled liquid crystal film. If the received screen display signal detects that the anti-peeping signal is local anti-peeping information, the backlight operating state of each backlight zone within the lamp substrate is controlled to match the film operating state of the electrically controlled liquid crystal film according to the local anti-peeping information and a brightness signal. This ensures that the collimated light emitted by the backlight zone at the first switching timing remains collimated even after passing through the anti-peeping film and the electrically controlled liquid crystal film at the second switching timing, thereby achieving local anti-peeping of the display panel. This improves controllability, meets the user's specific needs for local anti-peeping, and avoids the high power consumption that exists in full-screen anti-peeping.

[0014] As shown in FIG. 1, FIG. 1 is a terminal structure schematic diagram of a hardware operating environment according to an embodiment of the present application.

[0015] The liquid crystal display device is the subject to which the anti-peeping control method for a liquid crystal display device according to the embodiment of the present application is applied. As shown in FIG. 1, the liquid crystal display device may include a processor 1001 (e.g., a CPU), a network interface 1004, a user interface 1003, a memory 1005, and a communication bus 1002. The communication bus 1002 enables connection and communication between these components. The user interface 1003 may include a display area and an input unit (e.g., a keyboard). Preferably, the user interface 1003 may further include a standard wired interface and a wireless interface. Preferably, the network interface 1004 may include a standard wired interface and a wireless interface (e.g., a Wi-Fi interface). The memory 1005 may be a high-speed RAM memory or a non-volatile memory, such as a magnetic disk memory. Preferably, the memory 1005 may be a storage device independent of the processor 1001.

[0016] In one embodiment, the LCD device may further include a webcam, RF (Radio Frequency) circuits, sensors, audio circuits, a WiFi module, etc. Among these, sensors include, for example, light sensors, motion sensors, and other sensors. Specifically, light sensors include an ambient light sensor and a proximity sensor. Among these, the ambient light sensor can adjust the brightness of the display based on the brightness of the ambient light. The proximity sensor can turn off the display and / or backlight when the mobile device is brought close to the ear. As a type of motion sensor, a gravity acceleration sensor can detect the magnitude of acceleration in each direction (usually three axes) and can detect the magnitude and direction of gravity when the device is stationary. This can be used for applications that recognize the orientation of the mobile device (e.g., landscape / portrait switching, related games, magnetometer orientation calibration), vibration recognition-related functions (e.g., pedometer, click), etc. Of course, the mobile device can also be equipped with other sensors such as a gyroscope, barometer, hygrometer, thermometer, infrared sensor, etc., which will not be described here.

[0017] Those skilled in the art will understand that the structure of the liquid crystal display device shown in FIG. 1 does not constitute a limitation on the liquid crystal display device, and that the liquid crystal display device may include more or fewer components than those shown, or that some components may be combined or have different component arrangements.

[0018] As shown in FIG. 1, the memory 1005, which serves as a type of computer storage medium, may include an operating system, a network communication module, a user interface module, and a computer processing program.

[0019] In the terminal shown in FIG. 1, the network interface 1004 is mainly connected to a back-end server and is used for data communication with the back-end server, the user interface 1003 is mainly connected to a client side (user side) and is used for data communication with the client side, and the processor 1001 calls a computer processing program stored in the memory 1005, receiving and detecting a screen display signal required for a liquid crystal display device, the screen display signal including a luminance signal and an anti-peeping signal; When it is detected that the anti-peeping signal in the screen display signal is local anti-peeping information, a step can be executed in which a first switching timing of the backlight operating state of the lamp substrate in the liquid crystal display device and a second switching timing of the film operating state of the electrically controlled liquid crystal film are controlled to match in accordance with the brightness signal, thereby realizing local anti-peeping display of the liquid crystal display device.

[0020] Furthermore, the processor 1001 calls a computer processing program stored in the memory 1005, Before the step of controlling the first switching timing of the backlight operating state of the lamp substrate in the liquid crystal display device and the second switching timing of the film operating state of the electrically controlled liquid crystal film to match according to the brightness signal, a step can be further performed of dividing the lamp substrate into a target backlight zone and other backlight zones according to the anti-peeping screen position signal in the local anti-peeping information, and controlling the film operating state of the electrically controlled liquid crystal film according to the film operating signal in the local anti-peeping information.

[0021] Furthermore, the processor 1001 calls a computer processing program stored in the memory 1005, When the film operating state of the electrically controlled liquid crystal film is at a second switching timing in a light-transmitting state, a step can be further executed of controlling the backlight operating state of the target backlight zone to be at a first switching timing in a light-on state according to the brightness signal, and controlling the backlight operating state of the other backlight zones to be at a first switching timing in a light-off state.

[0022] Furthermore, the processor 1001 calls a computer processing program stored in the memory 1005, When the film operating state of the electrically controlled liquid crystal film is at the second switching timing in the opaque state, a step can be further executed of controlling the backlight operating state of the target backlight zone to be at the first switching timing in the off state according to the brightness signal, and controlling the backlight operating state of the other backlight zone to be at the first switching timing in the on state.

[0023] Furthermore, the processor 1001 calls a computer processing program stored in the memory 1005, After the step of receiving and detecting a screen display signal required for the liquid crystal display device, if it is detected that the anti-peeping signal in the screen display signal is full-screen anti-peeping information, a step can be further executed of controlling the second switching timing of the film operating state of the electrically controlled liquid crystal film to be in a light-transmitting state according to the full-screen anti-peeping information, and controlling the backlight operating state of the lamp substrate to be in a first switching timing of a lit state according to the brightness signal.

[0024] Furthermore, the processor 1001 calls a computer processing program stored in the memory 1005, After the step of receiving and detecting a screen display signal required for the liquid crystal display device, if it is detected that the anti-peeping signal in the screen display signal is full visibility information, a step can be further executed of controlling the second switching timing of the film operating state of the electrically controlled liquid crystal film to be in a cloudy state according to the full visibility information, and controlling the backlight operating state of the lamp substrate to be in a first switching timing to be in a lit state according to the brightness signal.

[0025] Furthermore, the processor 1001 calls a computer processing program stored in the memory 1005, The steps of driving liquid crystal molecules in a display panel in the liquid crystal display device using an adaptation signal further included in the screen display signal, and displaying a corresponding screen on the display panel according to the brightness signal and anti-peeping signal can be further performed.

[0026] Referring to FIG. 2, an embodiment of the present application provides an anti-peeping control method for a liquid crystal display device, which includes the following steps:

[0027] In step S10, a screen display signal required for the LCD device is received and detected, which includes a brightness signal and an anti-peeping signal.

[0028] In this embodiment, before the display panel displays the display screen, the digital system unit inside the LCD device receives the display signals required for processing the display screen, which include a brightness signal, an anti-peeping signal, and a compatibility signal, and may include other signals, which are not limited in this embodiment.

[0029] When the digital system unit receives the screen display signal, it performs branching processing according to the different signal types in the screen display signal. In this embodiment, the anti-peeping signal is the main focus, and when the digital system unit receives the anti-peeping signal, it detects the information contained in the anti-peeping signal, and combines it with the brightness signal to perform different logical controls on the Mini LED lamp board based on the different information contained in the anti-peeping signal. Here, the Mini LED lamp board referred to in this embodiment is equivalent to the lamp board in Figure 5.

[0030] In step S20, if it is detected that the anti-peeping signal in the screen display signal is local anti-peeping information, the first switching timing of the backlight operating state of the lamp substrate in the liquid crystal display device and the second switching timing of the film operating state of the electrically controlled liquid crystal film are controlled to match in accordance with the brightness signal, thereby realizing local anti-peeping display of the liquid crystal display device.

[0031] For example, if the digital system unit detects the anti-peeping signal and the obtained information is local anti-peeping information, it means that the user needs to locally prevent peeping of the display panel at that time, and the digital system unit controls the film operating state of the electrically controlled liquid crystal film based on the local anti-peeping information to alternate between a light-transmitting state and an opaque state, i.e., controls the electrically controlled liquid crystal film to alternate between the light-transmitting state and the opaque state at a frequency of 20 Hz or more.

[0032] The Mini LED lamp substrate is controlled to be turned on when the electrically controlled liquid crystal film is in a translucent state, and turned off when the electrically controlled liquid crystal film is in an opaque state, thereby avoiding scattering of incident light within the liquid crystal display device and ensuring that the light is projected parallel to the display panel to display the corresponding screen, thereby putting the display panel into an anti-peeping state. According to the characteristics of the Mini LED lamp substrate having a plurality of spaced backlight zones, the film operating state of the electrically controlled liquid crystal film is controlled to alternate between the translucent state and the opaque state, thereby performing an anti-peeping operation in the corresponding backlight zone where the anti-peeping screen position signal is indicated, i.e., the target backlight zone, and performing a non-anti-peeping operation in the corresponding backlight zone where the anti-peeping screen position signal is not indicated, i.e., the other backlight zones. By matching the first switching timing of the backlight operating state of the target backlight zone with the second switching timing of the film operating state of the electrically controlled liquid crystal film with each other, a local anti-peeping effect can be achieved on the same display panel.

[0033] In one embodiment, step S21 is further included before the step of controlling the first switching timing of the backlight operating state of the lamp substrate in the liquid crystal display device and the second switching timing of the film operating state of the electrically controlled liquid crystal film to be consistent according to the brightness signal in step S20.

[0034] In step S21, the lamp substrate is divided into a target backlight zone and other backlight zones according to the anti-peeping screen position signal in the local anti-peeping information, and the film operation state of the electrically controlled liquid crystal film is controlled according to the film operation signal in the local anti-peeping information.

[0035] Specifically, the Mini LED lamp board is divided into a target backlight zone and other backlight zones according to the anti-peeping screen position signal in the local anti-peeping information. For example, if a user controls the left half of the display panel as an area requiring anti-peeping and the right half is not controlled using an operating device, the backlight zone corresponding to the left half of the display panel is divided as the target backlight zone and the backlight zone corresponding to the right half is divided as the other backlight zone according to the anti-peeping screen position signal generated by the operation. At the same time, the logic control unit in the LCD display device controls the electrically controlled liquid crystal film to alternate between a translucent state and an opaque state according to the film operation signal in the local anti-peeping information.

[0036] Referring to FIG. 3, the target backlight zone can be dynamically changed. For example, if a user uses an operating device to select a displayed on the display panel as an area requiring privacy protection, and then moves the position of a from left to right (110 and 111 represent the previous position of a, and 112 represents its current position, so the dynamic movement of a on the display panel in FIG. 3 is 110 → 111 → 112), the privacy protection screen position information is updated according to the trajectory of a's positional movement, and the target backlight zone corresponding to the privacy protection screen position information is further updated. This allows the area requiring privacy protection on the display panel to dynamically change in accordance with the change in the display position of the information content. As can be seen from the visual frame (i.e., 116) of user (1) (the user standing in the center position), user (1) can clearly see a on the display panel, regardless of where a is located on the display panel. Conversely, as can be seen from the visual frame (117) of user (2) (a user standing in a non-central position), due to the local anti-peeping effect, user (2) can only see information content other than a, and for a, user (2) can only see a black shadow. Specifically, 113 and 114 represent the position of a before its movement as seen by user (2), and 115 represents the current position of a as seen by user (2), so the dynamic movement position of a as seen by user (2) is 113 → 114 → 115. This further enhances the controllable freedom and convenience of anti-peeping technology, eliminating the need for users to operate and set it again when there is a change in the area requiring anti-peeping.

[0037] In one embodiment, in step S20, the step of controlling the first switching timing of the backlight operating state of the lamp board in the liquid crystal display device and the second switching timing of the film operating state of the electrically controlled liquid crystal film according to the luminance signal to match each other includes: Step S22: when the film operating state of the electrically controlled liquid crystal film is the second switching timing in the light transmitting state, control the backlight operating state of the target backlight zone to be the first switching timing in the light emitting state according to the luminance signal, and control the backlight operating state of the other backlight zones to be the first switching timing in the light off state; and step S23, when the film operating state of the electrically controlled liquid crystal film is at the second switching timing in the opaque state, controlling the backlight operating state of the target backlight zone to be at the first switching timing in the off state according to the brightness signal, and controlling the backlight operating state of the other backlight zones to be at the first switching timing in the on state.

[0038] At this time, if the film operating state of the electrically controlled liquid crystal film is switched to a translucent state, the logic control unit switches the backlight operating state of the target backlight zone to an on state and switches the backlight operating state of the other backlight zones to an off state or on state according to the brightness signal at this time (to achieve a high-contrast screen effect, the backlight operating state of the other backlight zones is not affected by the film operating state of the electrically controlled liquid crystal film and the information on whether to prevent peeping). At this time, if the film operating state of the electrically controlled liquid crystal film is switched to a opaque state, the logic control unit switches the backlight operating state of the target backlight zone to an off state and switches the backlight operating state of the other backlight zones to an on state according to the brightness signal at this time, so that a user standing in a central position can observe the contents of the entire display panel, and a user standing in a non-central position can only observe the contents of the display panel corresponding to the other backlight zones, thereby achieving the effect of localized anti-peeping of the display panel.

[0039] The brightness adjustment method for the target backlight zone and other backlight zones according to the brightness signal can be either DC (voltage level) dimming or PWM (pulse width modulation) dimming. When using PWM dimming, the adjustment frequency of the lamp beads in the target backlight zone and other backlight zones is an integer multiple of the frequency of the electrically controlled liquid crystal film. For example, if the frequency of the electrically controlled liquid crystal film is 20 Hz, the frequency of the target backlight zone and other backlight zones can be an integer multiple of 40 Hz, 60 Hz, 80 Hz, etc.

[0040] In one embodiment, the screen display signal in step S10 further includes a matching signal.

[0041] In step S11, the liquid crystal molecules in the display panel of the liquid crystal display device are driven by the adaptive signal, and a corresponding screen is displayed on the display panel according to the brightness signal and the anti-peeping signal.

[0042] An example will be described in which the display panel is an LCD (Liquid Crystal Display) display panel and the corresponding compatible signal is an LCD compatible signal.

[0043] The LCD adaptation signal is used to drive liquid crystal molecules in the LCD display panel, and in relation to the above-mentioned scenario (i.e., when it is detected that the anti-peeping signal contains local anti-peeping information, the first switching timing of the backlight operating state of the backlight zone in the LCD display device and the second switching timing of the film operating state of the electrically controlled liquid crystal film are controlled to be adapted according to the local anti-peeping information and the brightness signal), the screen displayed on the LCD display panel at this time will be such that (1) a user standing in a central position can observe the information content displayed on the entire LCD display panel, and (2) a user standing in a non-central position can only observe the information content on a partial area of ​​the entire LCD display panel (i.e., the information content on the LCD display panel corresponding to other backlight zones), and the LCD display panel will be able to display a high-contrast screen in local dynamic anti-peeping mode under the backlight zone control of the MiniLED lamp board.

[0044] In this embodiment, the digital system unit receives and detects the screen display signals required for the display screen of the liquid crystal display device, and performs branching processing according to different signal types in the screen display signals, so that the logic control unit can perform different logic controls based on the branching processing. For example, when local anti-peeping information is detected, based on the characteristics of a lamp substrate having multiple backlight zones spaced apart, the film operating state of the electrically controlled liquid crystal film is controlled to alternate between a translucent state and an opaque state, and an anti-peeping operation is performed in the corresponding target backlight zone where the anti-peeping screen position signal is indicated (i.e., when the electrically controlled liquid crystal film switches to the translucent state, it is turned on, and when the electrically controlled liquid crystal film switches to the opaque state, it is turned off), and an anti-peeping non-operation is performed in other corresponding backlight zones where the anti-peeping screen position signal is not indicated, so that the backlight operating state of each backlight zone and the film operating state of the electrically controlled liquid crystal film are compatible with each other, thereby realizing the effect of local anti-peeping on the same display panel, meeting users' needs for local anti-peeping, enhancing the flexibility of anti-peeping technology, and avoiding high power consumption in the full-screen anti-peeping state.

[0045] Further, referring to FIG. 4, another embodiment of the present application provides an anti-peeping control method for a liquid crystal display device, which includes receiving and detecting a screen display signal required for the liquid crystal display device in step S10, When it is detected that the anti-peeping signal in the screen display signal is full-screen anti-peeping information, the method further includes step S30 of controlling the second switching timing of the film operating state of the electrically controlled liquid crystal film to be in a light-transmitting state according to the full-screen anti-peeping information, and controlling the backlight operating state of the lamp substrate to be in a first switching timing of a lighting state according to the brightness signal.

[0046] If the digital system unit detects the anti-peeping signal and the obtained information is full-screen anti-peeping information, it means that the user needs to prevent the entire display panel from being peeped at that time, so the digital system unit controls the film operating state of the electrically controlled liquid crystal film to maintain a light-transmitting state based on the full-screen anti-peeping information. At the same time, the logic control unit controls the entire Mini LED lamp board to be lit according to the brightness signal at this time, so that the parallel light emitted from the entire Mini LED lamp board is still projected as parallel light onto the entire display panel after passing through the anti-peeping film and the electrically controlled liquid crystal film in a light-transmitting state, so that the information content on the entire display panel can only be seen by a user standing in a central position, and no information content can be seen by a user standing in a non-central position.

[0047] In one embodiment, after receiving and detecting a screen display signal required for the liquid crystal display device in step S10, When it is detected that the anti-peeping signal in the screen display signal is full-visibility information, the method further includes step S40 of controlling the second switching timing of the film operating state of the electrically controlled liquid crystal film to be in a cloudy state according to the full-visibility information, and controlling the backlight operating state of the lamp substrate to be in a first switching timing of a lit state according to the brightness signal.

[0048] If the digital system unit detects the anti-peeping information and finds that the information obtained is full-visible information, it means that the user does not need to perform anti-peeping operations on the display panel at this time, so the digital system unit controls the film operating state of the electrically controlled liquid crystal film to maintain the opaque state based on the full-visible information. At the same time, the logic control unit controls the entire Mini LED lamp board to be in an off state according to the brightness signal at this time, so that the parallel light emitted by the entire Mini LED lamp board diverges after passing through the electrically controlled liquid crystal film in the opaque state, and the scattered light is projected onto the entire display panel, so that the information content of the entire display panel can be seen by users at any viewing angle.

[0049] In this embodiment, the user can not only perform local anti-peeping operations on the information content displayed in a specific area on the display panel in a targeted manner, but can also perform full-screen anti-peeping operations or full-screen viewing operations on the entire display panel according to actual needs, thereby meeting the diverse operating needs of users.

[0050] An embodiment of the present application further provides a liquid crystal display device, the liquid crystal display device comprising: a digital system unit for receiving and detecting a screen display signal required for a liquid crystal display device, the screen display signal including a luminance signal and an anti-peeping signal; and a logic control unit that, when it is detected that the anti-peeping signal in the screen display signal is local anti-peeping information, controls the first switching timing of the backlight operating state of the lamp substrate in the liquid crystal display device and the second switching timing of the film operating state of the electrically controlled liquid crystal film to match in accordance with the local anti-peeping information and the brightness signal, thereby realizing local anti-peeping display of the liquid crystal display device.

[0051] Referring to FIG. 5, the liquid crystal display device further includes a lamp substrate 20 and an electric control liquid crystal film 50; The lamp substrate 20 includes a plurality of backlight zones spaced apart, each of which includes a target backlight zone that projects onto an anti-peeping area. When the liquid crystal display device is in the local anti-peeping mode, a first switching timing at which the target backlight zone is in a lit state is synchronized with a second switching timing at which the electrically controlled liquid crystal film 50 is in a translucent state, and a first switching timing at which the target backlight zone is in an extinguished state is synchronized with a second switching timing at which the electrically controlled liquid crystal film 50 is in an opaque state. Here, the lit state and the extinguished state are backlight operating states of the backlight zone, and the translucent state and the opaque state are film operating states of the electrically controlled liquid crystal film 50.

[0052] The liquid crystal display device further includes an optical adjustment control member 30, an anti-peeping film 40, and a display panel 60, which are stacked in this order in the light emission direction of the lamp substrate, The electrically controlled liquid crystal film 50 is provided between the anti-peeping film 40 and the display panel 60, The lamp substrate 20 , the optical adjustment control member 30 , the anti-peeping film 40 , the electrically controlled liquid crystal film 50 and the display panel 60 constitute a liquid crystal display assembly, which is installed in the support frame 10 .

[0053] In a liquid crystal display device in which the normal lamp substrate in the conventional liquid crystal display device shown in Figure 5 is replaced with a MiniLED (Mini Light-Emitting Diode, submillimeter light-emitting diode) lamp substrate having multiple backlight zones arranged at intervals, the lamp substrate 20 is of MiniLED type and is made up of multiple lamp beads.Therefore, while a normal lamp substrate can only operate at the same brightness overall, a MiniLED lamp substrate can operate at different brightness locally, making it possible to control different light and dark effects for the brightness projected onto the electrically controlled liquid crystal film 50.

[0054] Meanwhile, the electrically controlled liquid crystal film 50 can switch between a translucent state and an opaque state by adjusting the voltage. Therefore, different states of the electrically controlled liquid crystal film 50 can project light sources with different brightness effects, thereby achieving a localized anti-peeping effect for the liquid crystal display device. As shown in FIG. 6, the translucent state is the power-on state of the electrically controlled liquid crystal film 50, allowing incident light 102 (i.e., light emitted from the Mini LED lamp board) to be collimated and emitted as 101 on the display panel 60. As shown in FIG. 7, the opaque state is the power-off state of the electrically controlled liquid crystal film 50, allowing incident light 102 to be scattered and emitted as 103 on the display panel. Therefore, to achieve an anti-peeping effect when the electrically controlled liquid crystal film 50 is in the opaque state, the target backlight zone at this time is switched off to prevent the incident light from being scattered and emitted. Meanwhile, the first and second switching timings occur only when there is a need for anti-peeping in the liquid crystal display device, and the switching timings are advantageous times for achieving an anti-peeping effect.

[0055] On the other hand, the target backlight zone is a zone that needs to be adapted to the second switching timing of the film operating state of the electrically controlled liquid crystal film 50 to achieve the anti-peeping effect, and zones other than the target backlight zone are other backlight zones, which do not require the anti-peeping effect and therefore do not need to be adapted to the second switching timing of the film operating state of the electrically controlled liquid crystal film 50.

[0056] In addition, the display panel 60 on the LCD device drives the liquid crystal molecules according to the received appropriate signal to display the display screen, and the optical adjustment control member 30 usually includes one or a combination of a diffusion sheet, a prism sheet, a composite film, DBEF (Dual Brightness Enhancement Film, reflective polarized brightness enhancement film), etc., which can mix the light source projected from the Mini LED lamp board into a uniform surface light source, and the anti-peeping film 40 filters and removes the non-parallel light rays in the surface light source, that is, converts the surface light source into parallel light with a small angle, and emits each light ray approximately parallel and perpendicular to the display panel 60.

[0057] Meanwhile, the support frame 10 is used to ensure stable and normal operation of the liquid crystal display device, and the support frame 10 includes a number of support structural members.

[0058] As used herein, the terms "comprises," "including," or any other variation thereof, imply a non-exclusive inclusion such that a process, method, article, or system of a set of elements includes not only those elements but also other elements not expressly listed or inherent in such process, method, article, or system. In the absence of further limitations, elements defined by the phrase "comprises a..." do not exclude the presence of other identical elements in the process, method, article, or system that includes the element in question.

[0059] The numbers of the above examples of the present application are for illustrative purposes only and do not represent the superiority or inferiority of the examples.

[0060] Through the above description of the embodiments, those skilled in the art can clearly understand that the methods of the above embodiments can be realized by adding the necessary general-purpose hardware platform to software (of course, hardware is also possible, but in many cases the former is a better implementation method). Based on this understanding, the technical solution of the present application, in essence or in part contributing to the prior art, can be embodied in the form of a software product. The computer software product can be stored in the above-mentioned storage medium (e.g., ROM / RAM, magnetic disk, optical disk) and includes several instructions that cause a terminal device (which may be a mobile phone, computer, server, air conditioner, network device, etc.) to execute the methods described in each embodiment of the present application.

[0061] The above are only some examples of the present application, and do not limit the scope of protection of the present application. Any equivalent structure or equivalent flow conversion made by using the contents of the specification and drawings of the present application, or direct or indirect application to other related technical fields, are also included in the scope of protection of the present application for the same reason.

Claims

1. A method for preventing peeping of a liquid crystal display device, comprising: Step S10: receiving and detecting a screen display signal required for the liquid crystal display device, the screen display signal including a luminance signal and an anti-peeping signal; and a step S20 of controlling, when it is detected that the anti-peeping signal in the screen display signal is local anti-peeping information, a first switching timing at which the backlight operating state of the lamp substrate (20) in the liquid crystal display device is switched between a light-on state and an off state in accordance with the luminance signal, and a second switching timing at which the film operating state of the electrically controlled liquid crystal film (50) is switched between a light-transmitting state and an opaque state, so as to be compatible with each other, dividing the lamp substrate (20) into a target backlight zone and other backlight zones in accordance with the anti-peeping screen position signal in the local anti-peeping information, and controlling the film operating state of the electrically controlled liquid crystal film (50) in accordance with the film operating signal in the local anti-peeping information, thereby realizing local anti-peeping display of the liquid crystal display device. Step S20 Step S22: when the film operating state of the electrically controlled liquid crystal film (50) is in a light-transmitting state, controlling the first switching timing and the second switching timing according to the luminance signal so that the backlight operating state of the target backlight zone is in a light-on state and the backlight operating state of the other backlight zones is in a light-off state; and a step S23 of controlling the first switching timing and the second switching timing according to the luminance signal when the film operating state of the electrically controlled liquid crystal film (50) is in a cloudy state so that the backlight operating state of the target backlight zone is in an off state and the backlight operating state of the other backlight zones is in an on state. A method for preventing peeping of liquid crystal display devices.

2. Step S20: When the digital system unit detects the anti-peeping signal and the obtained information is the local anti-peeping information, the digital system unit controls the electrically controlled liquid crystal film (50) to switch between a transparent state and an opaque state at a frequency of 20 Hz or more. The method for preventing peeping of a liquid crystal display device according to claim 1.

3. The light-transmitting state corresponds to the power-on state of the electrically controlled liquid crystal film (50), and the opaque state corresponds to the power-off state of the electrically controlled liquid crystal film (50). The method for preventing peeping of a liquid crystal display device according to claim 2.

4. The target backlight zone is a zone that needs to be adapted to the second switching timing of the film operating state of the electrically controlled liquid crystal film (50) to achieve an anti-peeping effect, and is a dynamically changeable zone. The method for preventing peeping of a liquid crystal display device according to claim 1.

5. the step of controlling the first switching timing and the second switching timing according to the luminance signal so that the backlight operation state of the target backlight zone is in an off state and the backlight operation state of the other backlight zones is in an on state, The method includes a step of dimming the target backlight zone and other backlight zones using a Pulse Width Modulation (PWM) dimming method according to the luminance signal, and adjusting the frequency of lamp beads in the target backlight zone and other backlight zones to an integer multiple of the frequency of the electrically controlled liquid crystal film (50). The method for preventing peeping of a liquid crystal display device according to claim 1.

6. After the step of receiving and detecting a screen display signal required for the liquid crystal display device, When it is detected that the anti-peeping signal in the screen display signal is full-screen anti-peeping information, the method further includes step S30 of controlling the film operating state of the electrically controlled liquid crystal film (50) to be a light-transmitting state at a second switching timing according to the full-screen anti-peeping information, and controlling the backlight operating state of the lamp substrate (20) to be a lighting state at a first switching timing according to the luminance signal. The method for preventing peeping of a liquid crystal display device according to claim 1.

7. After the step of receiving and detecting a screen display signal required for the liquid crystal display device, When it is detected that the anti-peeping signal in the screen display signal is full-screen visibility information, the method further includes step S40 of controlling the film operating state of the electrically controlled liquid crystal film (50) to be opaque at a second switching timing according to the full-screen visibility information, and controlling the backlight operating state of the lamp board (20) to be lit at a first switching timing according to the luminance signal. The method for preventing peeping of a liquid crystal display device according to claim 1.

8. The screen display signal further includes an adaptation signal; The method further includes a step S11 of driving liquid crystal molecules in a display panel (60) in the liquid crystal display device by the adaptation signal, and displaying a corresponding screen on the display panel (60) according to the brightness signal and the anti-peeping signal. The method for preventing peeping of a liquid crystal display device according to claim 1.

9. A liquid crystal display device, The liquid crystal display device is used in the liquid crystal display device anti-peeping control method according to any one of claims 1 to 4, The liquid crystal display device is a digital system unit for receiving and detecting a screen display signal required for a liquid crystal display device, the screen display signal including a luminance signal and an anti-peeping signal; and a logic control unit that, when it is detected that the anti-peeping signal in the screen display signal is local anti-peeping information, controls a first switching timing at which the backlight operating state of the lamp substrate (20) in the liquid crystal display device is switched between a light-on state and an off state and a second switching timing at which the film operating state of the electrically controlled liquid crystal film (50) is switched between a light-transmitting state and an opaque state so as to match each other in accordance with the local anti-peeping information and the luminance signal, thereby realizing a local anti-peeping display of the liquid crystal display device. LCD display equipment.

10. The liquid crystal display device further includes a lamp substrate (20) and an electrically controlled liquid crystal film (50); The lamp substrate (20) includes a plurality of spaced-apart backlight zones; The backlight zone includes a target backlight zone that projects onto an anti-peeping area, and when the liquid crystal display device is in a local anti-peeping mode, a first switching timing at which the target backlight zone turns on is synchronized with a second switching timing at which the electrically controlled liquid crystal film (50) turns translucent, and a first switching timing at which the target backlight zone turns off is synchronized with a second switching timing at which the electrically controlled liquid crystal film (50) turns opaque, the on state and the off state are backlight operation states of the backlight zone; The transparent state and the opaque state are the film operating states of the electrically controlled liquid crystal film (50).

10. The liquid crystal display device according to claim 9.

11. The liquid crystal display device further includes an optical adjustment control member (30), an anti-peeping film (40), and a display panel (60), which are stacked in this order in the light emission direction of the lamp substrate (20), The electrically controlled liquid crystal film (50) is provided between the anti-peeping film (40) and the display panel (60), The lamp substrate (20), the optical adjustment control member (30), the anti-peeping film (40), the electrically controlled liquid crystal film (50) and the display panel (60) constitute a liquid crystal display assembly, and the liquid crystal display assembly is installed in a support frame (10).

11. The liquid crystal display device according to claim 10.

12. The display panel (60) drives the liquid crystal molecules according to the received compatible signal to display the display screen; The optical adjustment control member (30) includes a diffusion sheet and a prism sheet, and can mix the light source projected by the lamp substrate (20) into a uniform surface light source; The anti-peeping film (40) filters out non-parallel light rays in the surface light source, The support frame (10) is used to ensure stable and normal operation of the liquid crystal display device and includes a plurality of support structural members.

12. The liquid crystal display device according to claim 11.

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