Method for preventing viewing of liquid crystal display device 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 to 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 controlling an anti-peek display of a liquid crystal display device and the liquid crystal display device. [Background technology]

[0003] Conventional anti-peep technologies for liquid crystal displays apply processing to the entire display panel of the liquid crystal display. That is, the entire display panel is controlled to switch to a full-screen anti-peep state or a non-peep-peep-peep state as necessary. Although this meets the user's state switching needs, switching the entire display panel to a full-screen anti-peep state or a non-peep-peep-peep-peep state gives the user little freedom of control, and the display panel in the full-screen anti-peep state may consume high power, so it does not meet the user's clearly-defined need for anti-peep. Summary of the Invention [Problem to be solved by the invention]

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

[0005] In order to achieve the above object, the present application provides a method for controlling an anti-peek 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; The method includes a step of, 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 the backlight operating state of a lamp substrate in the liquid crystal display device and a second switching timing of the film operating state of an electrically controlled liquid crystal film to match each other in accordance with the brightness signal, thereby realizing local anti-peep display of the liquid crystal display device.

[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; The liquid crystal display device includes a logic control unit that, when it is detected that an anti-peep signal in the screen display signal is local anti-peep information, realizes local anti-peep display of the liquid crystal display device by controlling a first switching timing of a backlight operating state of a lamp substrate in the liquid crystal display device and a second switching timing of a film operating state of an electrically controlled liquid crystal film to be compatible with each other in accordance with the local anti-peep information and the brightness signal.

[0007] (Beneficial Effects) The present application receives and detects a screen display signal required for a liquid crystal display device based on a digital system unit. When a user's need for localized anti-peeping is detected, the first switching timing of the backlight operation state based on multiple target backlight zones in a lamp substrate and the second switching timing of the film operation state of the electrically controlled liquid crystal film are matched with each other so that the parallel light emitted by the backlight zone at the first switching timing remains parallel 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 operation state of the electrically controlled liquid crystal film is in a light-transmitting state at the second switching timing, the backlight operation state of the target backlight zone at this time is switched to the first switching timing in a light-on state so that the light emitted after the lamp beads of the target backlight zone are turned on remains parallel after passing through the anti-peeping film and the electrically controlled liquid crystal film in a light-transmitting state. Thus, only users facing the display panel can 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 the user's demand for preventing localized peeping, enhances the flexibility of peeping prevention technology, and avoids the situation of high power consumption in the full-screen peeping prevention state. [Brief description of the drawings]

[0008] [Figure 1] FIG. 2 is a schematic diagram of a terminal structure of a hardware operating environment according to an embodiment of the present application; [Diagram 2] 1 is a schematic flowchart of an embodiment of an anti-peek control method for a liquid crystal display device according to the present application. [Diagram 3] FIG. 13 is a schematic diagram of scenarios of what users in 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-peek control method for a liquid crystal display device of the present application. FIG. [Diagram 5] 1 is a structural schematic diagram of a liquid crystal display device according to the present application; [Figure 6] 1 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. [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 PREFERRED EMBODIMENTS

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

[0010] It should be understood that the specific embodiments 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-peep information is detected, control the first switching timing of the backlight operation state of the backlight zone and the second switching timing of the film operation state of the electrically controlled liquid crystal film to be compatible according to the brightness signal in the local anti-peep information, thereby further realizing local anti-peep display of the liquid crystal display device.

[0012] Conventional anti-peep technologies for liquid crystal displays apply processing to the entire display panel of the liquid crystal display. That is, the entire display panel is controlled to switch to a full-screen anti-peep state or a non-peep-peep-peep-peep state as needed. This has the problem that the degree of control by the user is low, and the power consumption of a display panel in the full-screen anti-peep state may be high, so it is not possible to meet the clear anti-peep needs of users.

[0013] This application provides a solution. A digital system unit receives and detects a screen display signal required for a liquid crystal display device, and matches a first switching timing of the backlight operation state based on a plurality of backlight zones in a lamp substrate with a second switching timing of the film operation state of the electrically controlled liquid crystal film. When it is detected that the anti-peeping signal in the received screen display signal is local anti-peeping information, the backlight operation state of each backlight zone in the lamp substrate and the film operation state of the electrically controlled liquid crystal film are controlled to match according to the local anti-peeping information and the brightness signal, so that the parallel light emitted by the backlight zone at the first switching timing remains parallel even after passing through the anti-peeping film and the electrically controlled liquid crystal film at the second switching timing, and further realizing local anti-peeping of the display panel. The degree of freedom that can be controlled is improved to meet the needs of local anti-peeping with a clear purpose of the user, and the high power consumption situation that exists in full-surface anti-peeping is avoided.

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

[0015] The subject to which the anti-peek control method for a liquid crystal display device according to the embodiment of the present application is applied is a liquid crystal display device. 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 is for realizing the connection and communication between these components. The user interface 1003 may include a display area (Display) and an input unit (e.g., a keyboard), and 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 stable memory (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 liquid crystal display device may further include a webcam, an RF (Radio Frequency) circuit, a sensor, an audio circuit, a WiFi module, etc. Among them, the sensor may be, for example, a light sensor, a motion sensor, or other sensors. Specifically, the light sensor includes an ambient light sensor and a proximity sensor. Among them, 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 the backlight when the mobile terminal is moved to the ear. As a type of motion sensor, the 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 stationary, and can be used for applications that recognize the orientation of the mobile terminal (e.g., switching between landscape and portrait orientation, related games, magnetometer orientation calibration), related functions of vibration recognition (e.g., pedometer, click), etc. Of course, the mobile terminal may further include other sensors such as a gyroscope, a barometer, a hygrometer, a thermometer, and an infrared sensor, which will not be described here.

[0017] Those skilled in the art will appreciate 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 some of the 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 used for data communication with the back-end server, the user interface 1003 is mainly connected to a client side (user side) and 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-peep signal in the screen display signal is local anti-peep information, a step can be executed of realizing local anti-peep display of the liquid crystal display device by controlling a first switching timing of the backlight operation state of the lamp substrate in the liquid crystal display device and a second switching timing of the film operation state of the electrically controlled liquid crystal film to be compatible in accordance with the brightness signal.

[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 each other according to the brightness signal, a step can be further executed of dividing the lamp substrate into a target backlight zone and other backlight zones according to an anti-peep screen position signal in the local anti-peep information, and controlling the film operating state of the electrically controlled liquid crystal film according to a film operation signal in the local anti-peep 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 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 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 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 a second switching timing in a cloudy 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 an off state according to the brightness signal, and controlling the backlight operating state of the other backlight zone to be at a first switching timing in a 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 a liquid crystal display device, when it is detected that the anti-peep signal in the screen display signal is full-surface anti-peep 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-surface anti-peep information, and controlling the backlight operating state of the lamp substrate to be in a first switching timing to be in a lighted 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 a liquid crystal display device, when it is detected that the anti-spy 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 step of driving liquid crystal molecules in a display panel in the liquid crystal display device by an adaptation signal further included in the screen display signal, and displaying a corresponding screen on the display panel in accordance with the brightness signal and the anti-snooping signal can be further performed.

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

[0027] In step S10, a display signal required for the liquid crystal display device is received and detected, the display signal includes a luminance signal and an anti-peeping signal.

[0028] In this embodiment, before the display panel displays the display screen, the digital system unit inside the liquid crystal display device receives the screen display signals required for processing the display screen. The screen display signals required in this embodiment include a luminance signal, an anti-peeping signal and a compatibility signal, and may specifically 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 different signal types in the screen display signal. In this embodiment, the anti-peep signal is the main component, and when the digital system unit receives the anti-peep signal, it performs detection on the information contained in the anti-peep signal, and performs different logic control on the Mini LED lamp board in combination with the brightness signal based on the different information contained in the anti-peep signal. Here, the Mini LED lamp board referred to in this embodiment is equivalent to the lamp board in FIG. 5.

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

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

[0032] When the electrically controlled liquid crystal film is in a light-transmitting state, the Mini LED lamp board is controlled to be turned on, and when the electrically controlled liquid crystal film is in an opaque state, the Mini LED lamp board is controlled to be turned off, thereby avoiding scattering of incident light in the liquid crystal display device and ensuring that the light is projected in a parallel state onto the display panel to display the corresponding screen, thereby making the display panel in an anti-peeping state. According to the characteristics of the Mini LED lamp board having a plurality of backlight zones arranged at intervals, the film operating state of the electrically controlled liquid crystal film is controlled to be alternately switched between a light-transmitting state and an opaque state, and an anti-peeping operation is performed in the corresponding backlight zone where the anti-peeping screen position signal is indicated, i.e., the target backlight zone, and an anti-peeping non-prevention operation is performed in the corresponding backlight zone where the anti-peeping screen position signal is not indicated, i.e., the other backlight zones, so that the first switching timing of the backlight operating state of the target backlight zone and the second switching timing of the film operating state of the electrically controlled liquid crystal film are adapted to each other, thereby realizing a local anti-peeping effect on the same display panel.

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

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

[0035] Specifically, according to the anti-peeping screen position signal in the local anti-peeping information, the Mini LED lamp board is divided into a target backlight zone and another backlight zone. For example, when the user controls the left half of the display panel as an area that needs anti-peeping and does not control the right half through the 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, according to the film operation signal in the local anti-peeping information, the logic control unit in the liquid crystal display device controls the electric control liquid crystal film to alternate between a transparent state and an opaque state.

[0036] In addition, referring to FIG. 3, the target backlight zone can be dynamically changed. For example, after a user controls a displayed on the display panel as an area that requires privacy protection using an operating device, the user operates to move the position of a from left to right (110 and 111 indicate the positions of a before the movement, and 112 indicates the current position of a, so that the dynamic movement position of a on the display panel in FIG. 3 is 110→111→112). According to the trajectory of the position movement of a, the privacy protection screen position information is updated, and further, the target backlight zone corresponding to the privacy protection screen position information is updated, so that the area on the display panel that requires privacy protection can be dynamically changed according to the change in the display position of the information content. As can be seen from the visual frame (i.e., 116) of user (1) (a user standing at the center position), user (1) can clearly see a on the display panel no matter where a is on the display panel. Conversely, as can be seen from the visual frame (117) of user (2) (a user standing at 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 the 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. The controllable freedom and convenience of the anti-peeping technology are further enhanced, and the situation where the user has to operate and set it again when there is a change in the area where anti-peeping is required is avoided.

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

[0038] At this time, if the film operating state of the electrically controlled liquid crystal film is switched to a transparent state, the logic control unit switches the backlight operating state of the target backlight zone to a lighted state, and switches the backlight operating states of the other backlight zones to a lighted state or a lighted state according to the brightness signal at this time (in order to achieve a high-contrast screen effect, the backlight operating states of the other backlight zones are 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 cloudy state, the logic control unit switches the backlight operating state of the target backlight zone to a lighted state, and switches the backlight operating state of the other backlight zones to a lighted 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 observe only the contents of the display panel corresponding to the other backlight zones, thereby achieving the effect of local anti-peeping of the display panel.

[0039] In addition, the adjustment method of the brightness adjustment performed on 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 electric control liquid crystal film. For example, when the frequency of the electric control liquid crystal film is 20Hz, the frequency of the target backlight zone and other backlight zones can be analogized by an integer multiple, such as 40Hz, 60Hz, 80Hz, etc.

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

[0041] In step S11, the liquid crystal molecules in the display panel of the liquid crystal display device are driven by the compatibility 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) panel and the corresponding compatible signal is an LCD compatible signal.

[0043] The LCD compatibility 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-peep signal contains local anti-peep information, the first switching timing of the backlight operation state of the backlight zone in the LCD display device and the second switching timing of the film operation state of the electrically controlled liquid crystal film are controlled to be compatible according to the local anti-peep information and the brightness signal), the screen displayed on the LCD display panel at this time is 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 observe only 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 can perform high-contrast screen display in local dynamic anti-peep mode under the backlight zone control of the Mini LED 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 a plurality of backlight zones spaced apart, the film operating state of the electrically controlled liquid crystal film is controlled to alternate between a light-transmitting 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 light-transmitting state, it is in the on state, and when the electrically controlled liquid crystal film switches to the opaque state, it is in the off state), and an anti-peeping non-anti-peeping 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 the user's demand for local anti-peeping, enhancing the flexibility of anti-peeping technology, and avoiding the situation of high power consumption in the full-surface 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 the steps of receiving and detecting a screen display signal required for the liquid crystal display device in step S10, When it is detected that the anti-peep signal in the screen display signal is full-surface anti-peep 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-surface anti-peep information, and controlling the backlight operating state of the lamp substrate to be in a first switching timing to be in a lighted state according to the brightness signal.

[0046] When the digital system unit detects the anti-peep signal and the obtained information is the full-screen anti-peep information, it means that the user needs to prevent the entire display panel from being peeped at this time, so the digital system unit controls the film operation state of the electric control liquid crystal film to maintain the light-transmitting state based on the full-screen anti-peep information. At the same time, the logic control unit controls the entire Mini LED lamp board to be in the light-on state according to the brightness signal at this time, so that the parallel light emitted by the entire Mini LED lamp board is still projected on the entire display panel as parallel light after passing through the anti-peep film and the electric control liquid crystal film in the light-transmitting state, so that the information content on the entire display panel at this time is only visible to the user standing at the center position, and the information content cannot be seen by the user standing at the non-center 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 to be in a lit state according to the brightness signal.

[0048] When the digital system unit detects the anti-peeping information and the obtained information is the full visible information, it means that the user does not need to perform the anti-peeping operation on the display panel at this time, so the digital system unit controls the film operation state of the electric control 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 the 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 electric control liquid crystal film in the opaque state, and the scattered light is projected on the entire display panel, so that the information content of the entire display panel at this time can be seen by the user at any visualization angle.

[0049] In this embodiment, the user can not only perform local anti-peeping operations on the information content displayed in a certain area on the display panel in a targeted manner, but can also perform full-surface anti-peeping operations or full-surface 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; The liquid crystal display device includes a logic control unit that, when it is detected that an anti-peep signal in the screen display signal is local anti-peep information, realizes local anti-peep display of the liquid crystal display device by controlling a first switching timing of a backlight operating state of a lamp substrate in the liquid crystal display device and a second switching timing of a film operating state of an electrically controlled liquid crystal film to be compatible with each other in accordance with the local anti-peep information and the brightness signal.

[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 from one another, the backlight zones including a target backlight zone that projects onto an anti-peep area, and when the liquid crystal display device is in a local anti-peep mode, a first switching timing at which the target backlight zone is in an on state is synchronized with a second switching timing at which the electrically controlled liquid crystal film 50 is in a light-transmitting state, and a first switching timing at which the target backlight zone is in an off state is synchronized with a second switching timing at which the electrically controlled liquid crystal film 50 is in an opaque state, where the on state and the off state are backlight operation states of the backlight zone, and the light-transmitting state and the opaque state are film operation 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-prying film 40, and a display panel 60, which are sequentially stacked in a light emission direction of the lamp substrate, The electrically controlled liquid crystal film 50 is provided between the anti-peep film 40 and the display panel 60, The lamp substrate 20 , the optical adjustment control member 30 , the anti-spy 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 FIG. 5 is replaced with a MiniLED (Mini Light-Emitting Diode, sub-millimeter light-emitting diode) lamp substrate having a plurality of spaced backlight zones, the lamp substrate 20 of the MiniLED type is made of a plurality of lamp beads. Therefore, while a normal lamp substrate can only operate at the same brightness overall, the MiniLED lamp substrate can operate at different brightness locally, so that it is possible to control different light and dark effects for the brightness projected onto the electrically controlled liquid crystal film 50.

[0054] On the other hand, the electrically controlled liquid crystal film 50 realizes switching between the light-transmitting state and the opaque state by adjusting the voltage, so that light sources with different light and dark effects are projected according to different states of the electrically controlled liquid crystal film 50, thereby realizing the local anti-peeping effect of the liquid crystal display device. As shown in FIG. 6, the light-transmitting state is the power-on state of the electrically controlled liquid crystal film 50, and the incident light 102 (i.e., the light emitted by the Mini LED lamp board) can be made parallel on the display panel 60 and emitted 101. As shown in FIG. 7, the opaque state is the power-off state of the electrically controlled liquid crystal film 50, and the incident light 102 can be scattered on the display panel and emitted 103. Therefore, in order to exert the 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 to the off state to avoid the incident light being scattered and emitted. On the other hand, the first switching timing and the second switching timing appear only when there is a demand for anti-peeping on the liquid crystal display device, and the switching timing is, in other words, a time point advantageous for realizing the 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-peep effect, and zones other than the target backlight zone are other backlight zones, which do not require the anti-peep 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 liquid crystal display 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-spy 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 the stable and normal operation of the liquid crystal display device, and the support frame 10 includes a number of supporting 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 including elements inherent in such process, method, article, or system. In the absence of further limitations, an element defined by the phrase "comprises a..." does not exclude the presence of other identical elements in the process, method, article, or system that includes the element.

[0059] The numbers of the above embodiments of the present invention are for illustrative purposes only and do not indicate superiority or inferiority of the embodiments.

[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 a required 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 its 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, a computer, a server, an air conditioner, or a 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, which do not limit the scope of protection of the present application. Any equivalent structure or equivalent flow conversion made by utilizing the contents of the specification and drawings of the present application, or directly or indirectly applied to other related technical fields, shall be included in the scope of protection of the patent of the present application for the same reason.

Claims

1. A method for preventing viewing of a liquid crystal display device, comprising: Step S10: 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 step S20 of realizing a local anti-peep display of the liquid crystal display device by 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 when the anti-peep signal in the screen display signal is detected to be local anti-peep information. A method for preventing unauthorized viewing of liquid crystal display devices.

2. When it is detected that the anti-peep signal in the screen display signal is local anti-peep information, the step of 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) in accordance with the luminance signal so as to match each other, thereby realizing a local anti-peep display of the liquid crystal display device, When the digital system unit detects the anti-peep signal and the obtained information is the local anti-peep 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.

2. The method for preventing unauthorized viewing of a liquid crystal display device according to claim 1.

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

4. Before the step of controlling the first switching timing of the backlight operation state of the lamp substrate (20) in the liquid crystal display device and the second switching timing of the film operation state of the electrically controlled liquid crystal film (50) to match each other according to the luminance signal, The method further includes a step of dividing the lamp substrate (20) into a target backlight zone and another backlight zone according to an anti-peep screen position signal in the local anti-peep information, and controlling a film operation state of the electrically controlled liquid crystal film (50) according to a film operation signal in the local anti-peep information.

2. The method for preventing unauthorized viewing of a liquid crystal display device according to claim 1.

5. 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 is a dynamically changeable zone.

5. The method for preventing unauthorized viewing of a liquid crystal display device according to claim 4.

6. The step of controlling the first switching timing of the backlight operation state of the lamp substrate (20) in the liquid crystal display device and the second switching timing of the film operation state of the electrically controlled liquid crystal film (50) to match each other according to the luminance signal includes: When the film operating state of the electrically controlled liquid crystal film (50) is a second switching timing in a light transmitting state, the backlight operating state of the target backlight zone is controlled to be a first switching timing in a light-on state according to the luminance signal, and the backlight operating state of the other backlight zones is controlled to be a first switching timing in a light-off state.

5. The method for preventing unauthorized viewing of a liquid crystal display device according to claim 4.

7. The step of controlling the first switching timing of the backlight operation state of the lamp substrate (20) in the liquid crystal display device and the second switching timing of the film operation state of the electrically controlled liquid crystal film (50) to match each other according to the luminance signal includes: When the film operating state of the electrically controlled liquid crystal film (50) is a second switching timing in a cloudy state, the backlight operating state of the target backlight zone is controlled to be a first switching timing in a turned-off state according to the luminance signal, and the backlight operating state of the other backlight zones is controlled to be a first switching timing in a turned-on state.

5. The method for preventing unauthorized viewing of a liquid crystal display device according to claim 4.

8. The step of controlling the backlight operation state of the target backlight zone to be in a first switching timing in an off state and controlling the backlight operation state of the other backlight zones to be in a first switching timing in an on state according to the luminance signal includes: The method includes the steps of dimming the target backlight zone and other backlight zones according to the luminance signal by a Pulse Width Modulation (PWM) dimming method, and adjusting the frequency of lamp beads in the target backlight zone and the other backlight zones to an integer multiple of the frequency of the electrically controlled liquid crystal film (50). The method for preventing unauthorized viewing of a liquid crystal display device according to claim 7.

9. After receiving and detecting a screen display signal required for the liquid crystal display device, When it is detected that the anti-peep signal in the screen display signal is full-screen anti-peep information, the method further includes a step S30 of controlling a second switching timing of the film operating state of the electrically controlled liquid crystal film (50) to a light-transmitting state according to the full-screen anti-peep information, and controlling a backlight operating state of the lamp board (20) to a first switching timing to a light-on state according to the luminance signal.

2. The method for preventing unauthorized viewing of a liquid crystal display device according to claim 1.

10. After 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-visibility information, the method further includes a step S40 of controlling a second switching timing of the film operating state of the electrically controlled liquid crystal film (50) to be in a cloudy state according to the full-visibility information, and controlling a backlight operating state of the lamp board (20) to be in a first switching timing of a lighting state according to the luminance signal.

2. The method for preventing unauthorized viewing of a liquid crystal display device according to claim 1.

11. 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.

2. The method for preventing unauthorized viewing of a liquid crystal display device according to claim 1.

12. A liquid crystal display device, The liquid crystal display device is used in the liquid crystal display device anti-peek control method according to any one of claims 1 to 7, 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-peep signal in the screen display signal is local anti-peep information, controls 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 in accordance with the local anti-peep information and the luminance signal, thereby realizing a local anti-peep display of the liquid crystal display device. LCD display equipment.

13. 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 spaced apart backlight zones; the backlight zone includes a target backlight zone that projects onto an anti-peep area, and when the liquid crystal display device is in a local anti-peep 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 light-transmitting state, and a first switching timing at which the target backlight zone is in an unlit state is synchronized with a second switching timing at which the electrically controlled liquid crystal film (50) is in an opaque state; 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).

13. A liquid crystal display device according to claim 12.

14. The liquid crystal display device further includes an optical adjustment control member (30), an anti-prying film (40), and a display panel (60), which are stacked in order in the light emission direction of the lamp substrate (20), The electrically controlled liquid crystal film (50) is provided between the anti-peep film (40) and the display panel (60), The lamp substrate (20), the optical adjustment control member (30), the anti-peep film (40), the electric control 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).

14. A liquid crystal display device according to claim 13.

15. The display panel (60) drives liquid crystal molecules according to the received suitable signal to display a display screen; The optical adjustment control member (30) includes a diffusion sheet and a prism sheet, and can mix the light sources projected by the lamp substrate (20) into a uniform surface light source; The anti-sneaky 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 number of support structural members.

15. A liquid crystal display device according to claim 14.

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