Dynamic privacy side-in backlight and control method thereof

Abstract

The present application relates to the technical field of the privacy screen, solve the problem that the prior art cannot intelligently realize dynamic switching of the privacy side-in backlight between the full-view display mode and the privacy display mode, provide a dynamic privacy side-in backlight and a control method thereof, comprising: obtaining a display mode control instruction input by a user and a real-time display mode; obtaining a target display mode according to the display mode control instruction, wherein the target display mode includes a full-view display mode and a privacy display mode; determining whether the real-time display mode needs to be switched according to the real-time display mode and the target display mode; when it is determined that the real-time display mode needs to be switched, switching the real-time display mode, obtaining a target driving control parameter; driving and controlling the corresponding FPC component to light up according to the target driving control parameter, realizing privacy display or full-view display. The present application realizes intelligent dynamic switching between full-view display and privacy display.

Description

Technical Field

[0001] This invention relates to the field of privacy screens, and more particularly to a dynamic privacy side-entry backlight and its control method. Background Technology

[0002] Privacy-protected side-lit backlights are a new type of display backlight structure. By incorporating a privacy film and backlight optical control components into the display screen, they limit the angle of light emission, allowing normal display in a specific direction while reducing brightness or obscuring the display from the side, thus achieving effective privacy protection. This type of backlight is commonly used in automotive displays and portable electronic devices, maintaining high display clarity and contrast while protecting user privacy.

[0003] Existing privacy-protecting edge-lit backlights mostly employ a traditional edge-lit light source combined with a fixed privacy film to achieve privacy display. Their backlight control technology primarily relies on global adjustment of the entire screen brightness, lacking precise zone-based driving capabilities for different display modes. Current technologies typically switch display modes via button commands or single control signals, but the control logic is relatively simple and cannot simultaneously meet the dynamic switching needs of full-view display and privacy display. Furthermore, existing backlight control methods often suffer from uneven brightness, high latency, and poor display quality during switching, failing to meet the requirements of high-resolution and high-contrast displays. However, existing privacy-protecting edge-lit backlights and their control methods still have significant technical limitations: they cannot achieve efficient and stable switching between full-view display mode and privacy display mode, making it difficult to meet users' display needs in different usage scenarios. In addition, existing solutions fail to effectively integrate the recognition and priority processing of multiple control commands (such as gestures and buttons), resulting in insufficient interactive flexibility and ease of use.

[0004] Chinese patent CN222213111U discloses a dynamic privacy-protected side-lit backlight, comprising: a privacy-protected viewing angle display component and a full-view display component stacked sequentially from bottom to top within an accommodating cavity formed by the same die-casting part, and electrically connected to a control terminal to achieve dynamic switching between the two display modes. The privacy-protected viewing angle display component includes a first light guide plate, a first LED strip, an optical film, a privacy film, and a first frame; the full-view display component includes a second light guide plate, a second LED strip, and a second frame. The second light guide plate adopts a transparent light guide plate structure to avoid blocking the light from the lower privacy display. To improve optical performance, the backlight also has a reflective bottom film, a reflective strip, and a reflective side film respectively provided at the bottom and sides of the light guide plate to enhance light reflection, increase brightness, and eliminate edge dark areas. The aforementioned patent achieves the switching between privacy protection and full-view display by independently lighting two sets of light guide plates and light strips, lacking an intelligent adjustment mechanism based on scene, angle, or ambient brightness. Furthermore, it does not involve parameter coordination at the structural and control levels, leading to problems such as sudden brightness changes, uneven viewing angles, and display flickering during the switching process. Therefore, the aforementioned patent as a whole remains at the stage of simple hardware layered control, lacking refined and adaptive dynamic privacy dimming capabilities.

[0005] Therefore, how to intelligently achieve dynamic switching between full-view display mode and privacy display mode for privacy-protected side-lit backlights is a technical problem that urgently needs to be solved. Summary of the Invention

[0006] In view of this, embodiments of the present invention provide a dynamic privacy-protected side-lit backlight and its control method to solve the problem in the prior art that the privacy-protected side-lit backlight cannot intelligently switch dynamically between full-view display mode and privacy-protected display mode.

[0007] In a first aspect, embodiments of the present invention provide a dynamic privacy-protecting side-entry backlight, comprising:

[0008] The main frame assembly includes a die-cast part, an inner plastic shell, and a central iron frame. The inner plastic shell is embedded in the plastic shell groove of the die-cast part to support the upper optical components. The central iron frame is located on the outermost side to press and fix the edge and define the boundary of the visible area.

[0009] The first display component includes a first FPC component, a first light guide plate, an optical film layer, and a reflective film component. The first FPC component is disposed on the lower part of the inner wall of the die-cast part and is opposite to the side light-incident surface of the first light guide plate. The optical film layer includes a light-diffusing film, a light-enhancing film, a DBEF film, and a privacy film stacked sequentially along the light-emitting direction.

[0010] The second display component includes a second FPC component and a second light guide plate. The second FPC component is disposed on the upper part of the inner wall of the die-cast part and is opposite to the side light-incident surface of the second light guide plate. The second light guide plate is used to achieve uniform light output from all angles.

[0011] The control component is electrically connected to the first FPC component and the second FPC component respectively, and is used to output mutually exclusive drive signals to the LED light-emitting units carried on the first FPC component and the LED light-emitting units carried on the second FPC component, so as to switch between full-view display mode and privacy display mode.

[0012] Preferably, the first FPC component and the second FPC component are fixed to the lower part of the inner wall of the die-casting part with the embossed line on the inner side of the die-casting part as the alignment reference; the back of the first FPC component and the back of the second FPC component are respectively thermally coupled to the back heat sink through thermally conductive adhesive, and respectively led out to the independent electrical interface of the control component to achieve independent drive without interference.

[0013] Preferably, the dynamic privacy-protecting side-entry backlight further includes:

[0014] The upper light guide plate reflective film is attached to the surface of the inner shell and serves as the attachment base and reflective interface of the upper light guide plate. The inner edge of the upper light guide plate reflective film is aligned with the outer edge of the central iron frame boss and a circumferential safety gap is reserved to avoid intrusion into the visible area.

[0015] In a second aspect, embodiments of the present invention provide a dynamic privacy-protecting side-lit backlight control method for controlling the dynamic privacy-protecting side-lit backlight as described in the first aspect, the method comprising:

[0016] Obtain user-inputted display mode control commands and real-time display mode;

[0017] According to the display mode control command, a target display mode is obtained, wherein the target display mode includes a full-view display mode and a privacy display mode;

[0018] Based on the real-time display mode and the target display mode, determine whether it is necessary to switch the real-time display mode;

[0019] When it is determined that the real-time display mode needs to be switched, the real-time display mode is switched through the control component, and the target drive control parameters of the FPC component after the switch are obtained.

[0020] Based on the target drive control parameters, the FPC component corresponding to the target display mode is driven to light up, thereby achieving privacy protection display or full-view display.

[0021] Preferably, the display mode control command includes target button commands and / or target gesture commands, and obtaining the target display mode according to the display mode control command includes:

[0022] If the display mode control instruction only includes the target key instruction, then according to the first mapping relationship between the preset key instruction and the display mode, the target key instruction is mapped to the corresponding target display mode;

[0023] If the display mode control instruction only includes the target gesture instruction, then the gesture instruction is identified to obtain the gesture type;

[0024] The gesture type is compared with each gesture in a preset reference gesture set. If the gesture type is a gesture in the reference gesture set, the target gesture command is mapped to the corresponding target display mode according to the second mapping relationship between the preset gesture command and the display mode.

[0025] If the display mode control command includes a target button command and a target gesture command, then the target display mode is determined based on the target button command and the target gesture command, combined with a preset command priority.

[0026] Preferably, if the display mode control command includes a target button command and a target gesture command, then the target display mode is determined based on the target button command and the target gesture command, combined with a preset command priority, including:

[0027] Based on the first mapping relationship, the target key instruction is mapped to the corresponding first candidate display mode;

[0028] The gesture type corresponding to the target gesture instruction is compared with each gesture in the preset reference gesture set. If the gesture type is a gesture in the reference gesture set, the target gesture instruction is mapped to the corresponding second candidate display mode according to the second mapping relationship.

[0029] The first candidate display mode and the second candidate display mode are compared. If the first candidate display mode and the second candidate display mode are the same, the first candidate display mode is taken as the target display mode.

[0030] If the first candidate display mode and the second candidate display mode are different, then obtain the usage scenario type of the dynamic privacy-proof side-entry backlight;

[0031] Based on the usage scenario type, determine the first priority corresponding to the button command and the second priority corresponding to the gesture command;

[0032] If the first priority is greater than the second priority, then the first candidate display mode is taken as the target display mode;

[0033] If the first priority is not greater than the second priority, then the second candidate display mode is taken as the target display mode.

[0034] Preferably, when it is determined that the real-time display mode needs to be switched, the real-time display mode is switched through the control component, and the target drive control parameters of the FPC component after the switch are obtained, including:

[0035] When it is determined that the real-time display mode needs to be switched, the real-time drive control parameters of the FPC component corresponding to the real-time display mode are obtained, wherein the real-time drive control parameters include the real-time drive current value, the real-time pulse width modulation duty cycle, and the real-time switching transition time.

[0036] According to the target display mode, the drive control parameters corresponding to the target display mode are used as the initial drive control parameters, wherein the initial drive control parameters include the initial drive current value, the initial pulse width modulation duty cycle, and the initial switching transition time.

[0037] Obtain the usage scenario type and usage location information of the dynamic privacy-protecting side-entry backlight;

[0038] Based on the usage scenario type and usage location information, the initial drive control parameters are adjusted to obtain the adjusted drive control parameters;

[0039] Based on the adjusted drive control parameters, the real-time drive control parameters are corrected to obtain the target drive control parameters.

[0040] Preferably, adjusting the initial drive control parameters according to the usage scenario type and usage location information to obtain the adjusted drive control parameters includes:

[0041] The usage scenario type and usage location information are obtained, wherein the usage scenario type includes indoor scenario, outdoor scenario and vehicle scenario, and the usage location information includes the installation location and installation angle of the dynamic privacy-proof side-entry backlight;

[0042] Based on the usage scenario type and combined with the preset mapping relationship between scenarios and brightness levels, the target brightness level is determined, wherein the target brightness level includes low brightness level, medium brightness level and high brightness level;

[0043] Based on the installation position and angle, the angle between the light emission direction of the dynamic privacy-proof side-entry backlight and the user's line of sight is analyzed to obtain the brightness compensation coefficient.

[0044] The initial drive current value is adjusted according to the target brightness level and the brightness compensation coefficient to obtain the adjusted drive current value.

[0045] Based on the adjusted drive current value, the initial pulse width modulation duty cycle is synchronously adjusted to obtain the adjusted pulse width modulation duty cycle;

[0046] Based on the usage scenario type, obtain the correction coefficient for the switching transition time;

[0047] The initial handover transition time is corrected according to the correction coefficient to obtain the adjusted handover transition time;

[0048] The adjusted drive control parameters are determined based on the adjusted drive current value, the adjusted pulse width modulation duty cycle, and the adjusted switching transition time.

[0049] Preferably, the step of analyzing the angular relationship between the light emission direction of the dynamic privacy-protecting side-entry backlight and the user's line of sight based on the installation position and installation angle to obtain the brightness compensation coefficient includes:

[0050] Based on the installation location and installation angle, the light emission direction vector of the dynamic privacy-protecting side-entry backlight is calculated.

[0051] Based on the location information, obtain the user's gaze direction vector;

[0052] The difference between the light emission direction vector and the user's line of sight direction vector is calculated to obtain the target angle between the light emission direction and the user's line of sight direction.

[0053] The target angle is compared with a preset angle threshold to determine the brightness compensation direction;

[0054] Based on the brightness compensation direction and the preset correspondence between the included angle and the brightness compensation value, the brightness compensation coefficient is calculated.

[0055] Preferably, the step of correcting the real-time drive control parameters based on the adjusted drive control parameters to obtain the target drive control parameters includes:

[0056] The difference between the adjusted drive control parameters and the real-time drive control parameters is calculated to obtain the drive control parameter difference.

[0057] Based on the adjusted switching transition time, the adjustment rate of the drive control parameter difference is allocated to obtain the adjustment step value corresponding to each drive control parameter.

[0058] Based on the adjustment step value, the real-time drive current value and the real-time pulse width modulation duty cycle are corrected in stages to obtain the stage correction parameters;

[0059] Based on the phased correction parameters, the output status of the FPC component is monitored to obtain the brightness fluctuation value and temperature change.

[0060] Based on the brightness fluctuation value and temperature rise change, the stability of the phased correction parameter is judged to obtain the convergence judgment result;

[0061] Based on the convergence judgment result, the current drive current value, pulse width modulation duty cycle and switching transition time are finally corrected to obtain the target drive control parameters.

[0062] In summary, the beneficial effects of the present invention are as follows:

[0063] This invention provides a dynamic privacy-protecting side-lit backlight and its control method. The method includes: acquiring a user-inputted display mode control command and a real-time display mode; acquiring a target display mode based on the display mode control command, wherein the target display mode includes a full-view display mode and a privacy-protecting display mode; determining whether the real-time display mode needs to be switched based on the real-time display mode and the target display mode; when it is determined that the real-time display mode needs to be switched, switching the real-time display mode through the control component to acquire the switched display mode; and controlling the first display component or the second display component to operate based on the switched display mode. This invention solves the problem in the prior art where privacy-protecting side-lit backlights cannot intelligently switch between full-view display mode and privacy-protecting display mode by introducing a multi-source command recognition and priority decision mechanism, combined with real-time display mode judgment and dynamic switching control. Specifically, the system first acquires user-input display mode control commands (including button commands and / or gesture commands), and identifies and verifies these commands based on a preset mapping relationship to ensure that only valid commands trigger mode switching. Second, it compares the real-time display mode with the target display mode to determine if switching is necessary, thus avoiding resource waste and display delays caused by invalid switching. If switching is indeed required, the control component adjusts the driving methods of the first and second display components to obtain the switched display mode, achieving a smooth transition between full-view display and privacy-protected display. Furthermore, when input commands conflict, priority judgment logic based on usage scenario type is introduced to ensure the intelligence and stability of display mode switching. Therefore, it not only achieves efficient and intelligent switching between two display modes but also improves the flexibility of interaction and the reliability of the display. Attached Figure Description

[0064] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the embodiments of the present invention will be briefly introduced below. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort, and these are all within the protection scope of the present invention.

[0065] Figure 1 This is a schematic diagram of the overall structure of the dynamic privacy-protecting side-entry backlight in Embodiment 1 of the present invention;

[0066] Figure 2 A schematic diagram of the overall process of the dynamic privacy-protecting side-entry backlight control method in Embodiment 2 of the present invention;

[0067] Figure 3 This is a flowchart illustrating the process of obtaining the target display mode according to the display mode control instruction in Embodiment 2 of the present invention.

[0068] Figure 4 This is a flowchart illustrating how the real-time display mode is switched using the control component in Embodiment 2 of the present invention, and how the target drive control parameters of the FPC component are obtained after the switch.

[0069] The numbers in the diagram are as follows:

[0070] 11-Die casting; 12-Inner shell; 13-Middle iron frame; 21-First FPC component; 22-First light guide plate; 23-Reflective film component; 24-Diffusing film; 25-Brightness enhancement film; 26-DBEF film; 27-Anti-spy film; 31-Second FPC component; 32-Second light guide plate. Detailed Implementation

[0071] The features and exemplary embodiments of various aspects of the present invention will now be described in detail. To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only configured to explain the present invention and are not configured to limit the present invention. For those skilled in the art, the present invention can be practiced without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the present invention by illustrating examples of the invention.

[0072] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising..." does not exclude the presence of additional identical elements in the process, method, article, or apparatus that includes said element.

[0073] It should be noted that all actions involving the acquisition of signals, information, or data in this invention are carried out in compliance with the relevant data protection laws and regulations of the locality and with authorization from the owner of the relevant device.

[0074] Example 1

[0075] Please see Figure 1 This invention provides a dynamic privacy-protecting side-entry backlight, comprising:

[0076] The main frame assembly includes a die-cast part 11, an inner plastic shell 12, and a central iron frame 13. The inner plastic shell 12 is embedded in the plastic shell groove of the die-cast part 11 to support the upper optical components. The central iron frame 13 is located on the outermost side to press and fix the edges and define the boundary of the visible area.

[0077] Specifically, the main frame assembly includes a die-cast part 11, an inner plastic shell 12, and a central iron frame 13. The die-cast part 11, the inner plastic shell 12, and the central iron frame 13 form a multi-layer support and limiting structure from bottom to top: the die-cast part 11 is located on the outermost layer, providing high-strength support and heat dissipation foundation for the whole, and its inner wall is machined with a plastic shell groove for embedding the inner plastic shell 12; the inner plastic shell 12 is precisely embedded in the plastic shell groove of the die-cast part 11, serving as a reference platform to support the upper optical components (such as light guide plates, reflective films, and diffuser film assemblies), and its inner wall is provided with a baffle and step structure to limit the position of the optical layer and prevent the optical components from shifting; the central iron frame 13 is located on the outermost side, and cooperates with the die-cast part 11 through fixing glue to achieve edge fixing and limit the boundary of the visible area, preventing the optical film from shifting outward or warping.

[0078] The first display component includes a first FPC component 21, a first light guide plate 22, an optical film layer, and a reflective film component 23. The first FPC component 21 is disposed on the lower part of the inner wall of the die-cast part 11 and is opposite to the side light-incident surface of the first light guide plate 22. The optical film layer includes a light-diffusing film 24, a light-enhancing film 25, a DBEF film 26, and a privacy film 27, which are stacked sequentially along the light-emitting direction.

[0079] Specifically, the first display component is located in the lower optical zone and includes a first FPC component 21, a first light guide plate 22, optical films, and a reflective film component 23. The first FPC component 21 is attached to the lower part of the inner wall of the die-cast part 11, with the light-emitting surface of the LED beads facing the side light-incident surface of the first light guide plate 22, forming a side-entry light path structure. The first light guide plate 22 is located below the optical film assembly and is responsible for guiding and uniformly diffusing light. Above it, a diffusing film 24, a brightness enhancement film 25, a DBEF film 26, and a privacy film 27 are layered sequentially. The diffusing film 24 is responsible for light diffusion and homogenization. The brightness enhancement film 25 and the DBEF film 26 reflect light from the non-emitting direction to the emitting direction to improve brightness, while the privacy film 27 limits the light emission angle through microstructures to achieve viewing angle control. The reflective film component 23 is attached below the light guide plate or to the surface of the inner shell 12 to reflect non-emitted light and improve light energy utilization. The first display component is limited by the inner frame and the middle shell in both the horizontal and vertical directions, ensuring stable film assembly and consistent optical path. This results in a high-contrast, directionally restricted and uniformly bright light field output in privacy mode, achieving a balance between optical performance and privacy protection.

[0080] The second display component includes a second FPC component 31 and a second light guide plate 32. The second FPC component 31 is disposed on the upper part of the inner wall of the die-cast part 11 and is opposite to the side light-incident surface of the second light guide plate 32. The second light guide plate 32 is used to achieve uniform light output from all angles.

[0081] Specifically, the second display component is located in the upper optical region of the backlight structure, and consists of a second FPC component 31 and a second light guide plate 32. The second FPC component 31 is installed on the upper part of the inner wall of the die-cast part 11, with its light-emitting surface facing the side light-incident surface of the second light guide plate 32, realizing side-incident coupling of the upper light. The second light guide plate 32 is arranged above the inner shell 12 or in the inner area of ​​the central iron frame 13. It is made of a high light transmittance material and forms a microstructure or optical scattering dot array inside the plate to uniformly scatter the side-incident light from multiple angles, thereby achieving a wide-angle and uniformly bright light output effect in the full-view mode. The second light guide plate 32 is isolated from the lower first light guide plate 22 by a partition structure or a reflective interface to avoid light path interference. With this upper-mounted light guide layout, the second display component can be lit independently to output high-brightness, wide-view background light without affecting the privacy display function of the lower layer, providing a stable light source for the full-view display mode.

[0082] The control component is electrically connected to the first FPC component 21 and the second FPC component 31 respectively, and is used to output mutually exclusive drive signals to the LED light-emitting units carried on the first FPC component 21 and the LED light-emitting units carried on the second FPC component 31, so as to switch between full-view display mode and privacy display mode.

[0083] Specifically, the control component is located in the electrical control area of ​​the dynamic privacy-protecting side-lit backlight, and is independently connected to the electrical interfaces of the first FPC component 21 and the second FPC component 31, respectively. The control component integrates a drive power module, a control chip, and a signal switching circuit, used to output mutually exclusive drive signals to the LED light-emitting units carried on the two FPCs. The control component not only enables rapid switching between modes but also ensures the stability of brightness output and optimizes system power consumption during switching, achieving intelligent mutual exclusion control between privacy-protecting and full-view display modes.

[0084] Preferably, the first FPC component 21 and the second FPC component 31 are fixed to the lower part of the inner wall of the die-casting part 11 with the embossed line on the inner side of the die-casting part 11 as the alignment reference; the back of the first FPC component 21 and the back of the second FPC component 31 are respectively thermally coupled to the back heat sink through thermally conductive adhesive, and respectively led out to the independent electrical interface of the control component to achieve independent drive without interference.

[0085] Specifically, the first FPC component 21 and the second FPC component 31 are installed using a common reference alignment method. The first FPC component 21 and the second FPC component 31 use the imprinted line formed on the inner side of the die-cast part 11 as a unified positioning reference line, and are respectively fixed to the lower area of ​​the inner wall of the die-cast part 11. This ensures consistent light incident angles and symmetrical light guide paths, avoiding optical ghosting or uneven brightness. The back surfaces of both the first FPC component 21 and the second FPC component 31 are thermally coupled to corresponding back heat sinks via thermally conductive adhesive. The thermally conductive adhesive ensures tight adhesion and uniform heat conduction, while the heat sinks quickly conduct the heat generated by the LED operation to the outer shell of the die-cast part 11 for diffusion, preventing high temperatures from causing luminous efficiency decay or color shift. The power supply and control signals of the first FPC component 21 and the second FPC component 31 are respectively led out to the control component through independent electrical interfaces, achieving physically isolated dual-channel drive control. This ensures that signals in different display modes do not interfere with each other and that the drive current is independently adjustable.

[0086] Preferably, the dynamic privacy-protecting side-entry backlight further includes:

[0087] The upper light guide plate reflective film is attached to the surface of the inner shell 12 and serves as the attachment base and reflective interface of the upper light guide plate. The inner edge of the upper light guide plate reflective film is aligned with the outer edge of the protrusion of the central iron frame 13 and a circumferential safety gap is reserved to avoid intrusion into the visible area.

[0088] Specifically, the reflective film of the upper light guide plate is attached to the planar surface of the inner shell 12 facing the upper light guide plate, positioned below the second light guide plate 32, forming a tight-fitting structure with the inner shell 12, serving as the attachment base and reflective interface for the upper light guide plate. The inner edge of the reflective film of the upper light guide plate is set with the outer edge of the protrusion of the central iron frame 13 as the alignment reference, ensuring that it is precisely aligned with the boundary of the visible area in the horizontal direction, while a safety gap is reserved in the circumferential direction to prevent the edge of the reflective film from encroaching into the visible display area, causing light obstruction or reflection interference.

[0089] Example 2

[0090] Please see Figure 2 This invention provides a dynamic privacy-protecting side-lit backlight control method for controlling the dynamic privacy-protecting side-lit backlight as described in Embodiment 1. The method includes:

[0091] Obtain user-inputted display mode control commands and real-time display mode;

[0092] Specifically, the user-initiated input signal for switching display states is acquired as a display mode control command. The acquisition methods for the display mode control command include key input and gesture input. At the same time, based on the currently lit first or second FPC component and its driving state, the real-time display mode is acquired. The real-time display mode includes a privacy screen display mode and a full-view display mode. By acquiring the display mode control command, the user's intention is identified, laying a stable foundation for subsequent driving signal switching and parameter adjustment.

[0093] According to the display mode control command, a target display mode is obtained, wherein the target display mode includes a full-view display mode and a privacy display mode;

[0094] Specifically, the display mode control commands are converted into a specific target display mode. Through a preset mapping relationship between control commands and display modes, button commands and / or gesture commands are parsed into corresponding mode options. If both exist simultaneously, a comprehensive judgment is made based on preset command priorities to determine the target display mode.

[0095] Based on the real-time display mode and the target display mode, determine whether it is necessary to switch the real-time display mode;

[0096] Specifically, the current real-time display mode is compared with the target display mode selected by the user to determine whether there is a need to switch modes. If the two are consistent, no redundant operation is required. If they are inconsistent, it is determined that a mode switch is required.

[0097] When it is determined that the real-time display mode needs to be switched, the real-time display mode is switched through the control component, and the target drive control parameters of the FPC component after the switch are obtained.

[0098] Specifically, after determining that the user needs to switch display modes, the control component can precisely execute and switch the real-time display mode, generating new drive control parameters as target drive control parameters. This ensures both rapid and smooth mode transitions, guaranteeing consistent optical output and natural visual transitions. The target drive control parameters characterize the electrical drive characteristics of the target FPC component (the group of LEDs about to be lit) in the new mode, including drive current value, pulse width modulation duty cycle, and switching transition time. By adjusting the drive control parameters to obtain the target drive control parameters, on the one hand, brightness abrupt changes and flicker during mode switching are significantly reduced, improving visual comfort; on the other hand, through dynamic calculation and output optimization of independent drive parameters, the light efficiency and display consistency in different modes are improved, ensuring seamless transition between privacy-protected display and full-view display states.

[0099] Based on the target drive control parameters, the FPC component corresponding to the target display mode is driven to light up, thereby achieving privacy protection display or full-view display.

[0100] Specifically, based on the target drive control parameters, the constant current channel and PWM modulation channel of the FPC component corresponding to the target display mode are set: firstly, the drive current and duty cycle are increased or maintained in stages according to the switching transition time, so that the LED brightness smoothly climbs to the target value along a predetermined slope; during the process, current / voltage and temperature feedback are read. If fluctuations or temperature rises close to the threshold are detected, the stepping is slowed down or the duty cycle is slightly adjusted back to maintain output stability; for the privacy mode, the center brightness and contrast are prioritized under the condition of limited light output angle to avoid lateral light spill; for the full viewing angle mode, the brightness is kept consistent under the higher requirement of light output uniformity, while avoiding transient flicker caused by rapid power-on. Finally, when the real-time output and the target drive control parameters converge, the current current, duty cycle and duration are locked to complete the stable lighting of the FPC component corresponding to the target display mode.

[0101] Preferably, please refer to Figure 3 The display mode control instructions include target button instructions and / or target gesture instructions, and obtaining the target display mode according to the display mode control instructions includes:

[0102] If the display mode control instruction only includes the target key instruction, then according to the first mapping relationship between the preset key instruction and the display mode, the target key instruction is mapped to the corresponding target display mode;

[0103] Specifically, when the display mode control command only includes the target key command, the acquired key signals are debouncing and timing analysis are performed according to the target key command to distinguish different triggering patterns and filter mechanical jitter interference. Then, the control module calls the first mapping relationship stored in the non-volatile memory, and uses the key number, triggering pattern, and current device status as search keys to look up and output the target display mode corresponding to the target key command.

[0104] If the display mode control instruction only includes the target gesture instruction, then the gesture instruction is identified to obtain the gesture type;

[0105] Specifically, if the display mode control command only includes the target gesture command, the system receives the raw signal from the gesture detection module based on the target gesture command, and identifies the user's movement trajectory through changes in infrared reflection distance, spatial coordinate trajectory, or time series features. The signal is preprocessed, including filtering out background noise and non-human motion signals, and then feature vectors are extracted, such as trajectory direction, duration, movement speed, and path smoothness. Next, by comparing the feature parameters with a preset gesture template library, the system determines the type of the current gesture, and the recognition result is output as the gesture type for subsequent steps to further determine the target display mode based on the mapping relationship.

[0106] The gesture type is compared with each gesture in a preset reference gesture set. If the gesture type is a gesture in the reference gesture set, the target gesture command is mapped to the corresponding target display mode according to the second mapping relationship between the preset gesture command and the display mode.

[0107] Specifically, the currently recognized gesture type is input to the matching module, and its similarity is compared with each gesture template in the reference gesture set. The similarity between the current gesture and the standard gesture is used as the basis for the comparison. When the comparison result is higher than a preset confidence threshold, the gesture is determined to be a valid gesture in the reference set. Subsequently, based on a preset second mapping relationship between gesture commands and display modes, a second mapping relationship table is obtained. The corresponding display mode command is output according to the recognized gesture type; for example, swiping up corresponds to enabling full-view mode, swiping down corresponds to switching to privacy mode, and hovering may be used for brightness pausing or mode hold. If the gesture fails to match any template or the confidence level is lower than the threshold, the system automatically ignores the input to avoid accidental touches that could cause display jitter.

[0108] If the display mode control command includes a target button command and a target gesture command, then the target display mode is determined based on the target button command and the target gesture command, combined with a preset command priority.

[0109] Specifically, when the display mode control command includes both the target button command and the target gesture command: a first candidate display mode and a second candidate display mode are generated in parallel. If they are consistent, they are directly confirmed; if they are inconsistent, the target display mode is determined according to the preset command priority.

[0110] Preferably, if the display mode control command includes a target button command and a target gesture command, then the target display mode is determined based on the target button command and the target gesture command, combined with a preset command priority, including:

[0111] Based on the first mapping relationship, the target key instruction is mapped to the corresponding first candidate display mode;

[0112] Specifically, the target key instruction is a discrete control event issued by the user through physical keys, including elements such as key number, triggering method, and occurrence time. The first mapping relationship is a pre-configured set of key-to-display-mode correspondences, used to standardize the conversion of different key events into functional semantics. The first candidate display mode is the mode result output by the mapping relationship, usually one of two types: full-view display or privacy screen display. The purpose of this step is to transform the physical key input, which is susceptible to noise and accidental touches, into stable and determinable target mode candidates, thereby providing a clear starting point for subsequent comparison and arbitration, and ensuring a one-to-one correspondence between the control logic and the actual display hardware. In implementation, the system first performs debouncing and timing analysis on the key events, identifies short press, long press, double press, and continuous press, and determines whether the event is in the usable domain by combining the current state of the device and safety constraints. For example, high-frequency switching can be restricted during driving to avoid distraction. Then, using the key number plus the triggering mode and context as the search key, the first mapping relationship is queried to obtain the first candidate display mode; if the lookup fails or ambiguity occurs, the system reverts to the predetermined default mode and logs it for later optimization. After mapping is complete, the system does not immediately drive the backlight. Instead, it generates a stable mode candidate to prepare for subsequent consistency comparison with gesture candidates. Thanks to this step, the button path has characteristics such as interpretability, low latency, and high determinism. Once adopted, it can directly point to a specific hardware driving strategy to achieve a privacy viewing angle and high contrast display effect. This is consistent with the system's dual-display structure and is conducive to obtaining uniform, bright, and targeted backlight performance.

[0113] The gesture type corresponding to the target gesture instruction is compared with each gesture in the preset reference gesture set. If the gesture type is a gesture in the reference gesture set, the target gesture instruction is mapped to the corresponding second candidate display mode according to the second mapping relationship.

[0114] Specifically, the target gesture command originates from continuous input from sensor channels such as cameras, infrared sensors, or inertial sensors. The gesture type is a standardized classification result of the input in terms of spatial shape and temporal trajectory. The reference gesture set is a library of gestures that the system allows to trigger control. The second mapping relationship is a set of corresponding gestures to display modes. The purpose of this step is to transform natural human movements into reliable control semantics, enabling users to complete mode selection without touching physical keys, thereby improving interaction convenience and security and privacy in specific scenarios. In implementation, the system performs denoising, subject segmentation, and key point or trajectory extraction on the raw sensor data to obtain a stable gesture feature sequence, and outputs the gesture type and confidence score through a classifier. Subsequently, it performs fault-tolerant matching with the reference gesture set, allowing mirrored gestures and subtle differences in movements to improve robustness. When the matching is successful and the confidence score reaches the threshold, the second mapping relationship is invoked to generate a second candidate display mode; if the recognition is insufficient, the current state is maintained and the user can be prompted to supplement the action or extend the duration. The gesture candidates obtained in this way are characterized by being non-contact, intuitive, and highly adaptable to different scenarios. Once adopted in subsequent arbitration, the system will switch the backlight driving path according to the corresponding mode, which is conducive to quickly responding to user intentions and maintaining the consistency and clarity of the image.

[0115] The first candidate display mode and the second candidate display mode are compared. If the first candidate display mode and the second candidate display mode are the same, the first candidate display mode is taken as the target display mode.

[0116] Specifically, the consistency comparison performs a semantic-level equivalence judgment on the candidate modes formed by two independent input channels. The target display mode is the mode result that the system finally confirms and sends to the backlight driver at the current moment. The purpose of this step is to prioritize the consensus of both when the user simultaneously provides button input and gesture input, reducing unnecessary arbitration and waiting, and ensuring that mode switching has the shortest path and the highest certainty.

[0117] In implementation, the system performs an equivalence check on the first and second candidates, while also considering the synchronization requirements within the time window to avoid misjudgments caused by accidental consistency across time slices. If the determination is consistent, the system immediately confirms the candidate as the target display mode and enters the switching execution sequence: deactivating the backlight path of the current mode, loading the backlight drive parameters of the target mode, smoothly illuminating the corresponding light source and partitions, and finally combining the optical film and diffuser to complete the output rendering and lock it into a stable state. By omitting priority arbitration and scene recognition, this step can significantly reduce latency and interface jitter. Combined with the coordinated control of partitioned dimming and optical structure, the target display effect can be presented faster and more stably, thus achieving better visual experience and consistency in actual use with frequent switching.

[0118] If the first candidate display mode and the second candidate display mode are different, then obtain the usage scenario type of the dynamic privacy-proof side-entry backlight;

[0119] Specifically, the usage scenario type refers to the system's abstraction of the current usage context based on the environment and task status, such as driving, meeting presentations, public commuting, personal movie watching, or office work. The purpose of this step is to introduce scenario context as a higher-level decision-making basis when two input channels give different intentions, ensuring that the final mode selection meets the overall optimal balance of security, privacy, and user experience. In implementation, the system integrates multi-source cues to identify the scenario type, including the device's foreground application status, location information and speed, ambient light and noise levels, number of people present and their interaction habits, time slots, and schedule tags. It also provides a credibility level and a short-term stability window for the identification results to avoid scenario jitter. Once the scenario type is acquired, it plays a crucial role in subsequent priority allocation and arbitration. For example, in driving scenarios, the determinism of physical buttons is emphasized, while in meeting or public spaces, the naturalness and privacy of gestures are prioritized. By elevating candidate disagreements to the contextual level for interpretation and constraint, the system can make mode selections that match real needs while ensuring safety and compliance, and provide consistent higher-level instructions for subsequent parameter adjustments and backlight driving, achieving end-to-end closed-loop control from user intent to optical output.

[0120] Based on the usage scenario type, determine the first priority corresponding to the button command and the second priority corresponding to the gesture command;

[0121] Specifically, the usage scenario type is an abstraction of the current usage context, such as driving, meeting presentations, public commuting, personal movie watching, or office work, used to describe the emphasis on security, privacy, and ease of interaction. Its purpose is to introduce a higher level of contextual constraints when button presses and gestures conflict, making the arbitration result more in line with real-world needs and risk control: for example, driving emphasizes reliable, low-misclick physical operation, while meetings or public spaces emphasize quick entry, privacy, and minimizing peeping. The first display component provides a full-view side-lit light source, and the second display component provides a privacy viewing angle. This structure is naturally suitable for weighing and switching between the two display paths based on the scenario, thus establishing the scenario → priority → mode link as an interpretable control loop. In implementation, the system first identifies the scenario type using multi-source cues, which may include the foreground application status, device displacement and speed, ambient light and noise levels, number of people present, and historical preferences, and provides confidence levels and short-term stability windows for the identification results to suppress jitter. The corresponding priority strategy set is then loaded, with button paths designated as the first priority and gesture paths as the second priority. The strategy can be a static template, such as prioritizing button input in driving scenarios, or an adaptive weighting system that dynamically adjusts based on recognition confidence, the success rate within the past 30 seconds, and user preferences. Thanks to the upper layer's use of scene constraints rather than a single signal arbitration, coupled with the underlying dual-path backlight structure and zone dimming capabilities, the system can make switching more closely resemble real-world requirements while ensuring safety and compliance. It also provides stable upper-level instructions for selecting subsequent backlight drive parameters and optical film combinations, thereby reducing visual inconsistencies caused by erroneous switching and lag.

[0122] If the first priority is greater than the second priority, then the first candidate display mode is taken as the target display mode;

[0123] Specifically, the first priority here corresponds to button path priority. The aim is to shorten the arbitration chain in scenarios emphasizing operational certainty and low risk of accidental touches, directly adopting the button-side mode candidate to avoid instability in gesture recognition or complex environments. The device's hardware pipeline allows for rapid implementation of the matching backlight path once the target mode is determined: if the target is a full-view mode, the side-emitting LED strip is prioritized and forms a wide viewing cone through the upper housing, diffuser plate, and reflective side film; if the target is a privacy mode, the corresponding FPC LED strip group is prioritized and works with the privacy film, brightness enhancement film, and diffusing and diffusion structures to form a limited viewing angle and high contrast output. This one-to-one correspondence between mode and physical pipeline gives button priority a natural execution advantage. In implementation, after confirming that the first priority is higher, the system immediately adopts the first candidate display mode and enters the driving phase: first, it smoothly shuts down the current mode; second, it loads the backlight driving parameters corresponding to the target mode; and third, it drives the corresponding light source.

[0124] If the first priority is not greater than the second priority, then the second candidate display mode is taken as the target display mode.

[0125] Specifically, when the second priority of the gesture path is no lower than that of the button path, the aim is to prioritize the user's natural action intent in scenarios that emphasize privacy immediacy and natural interaction, reducing reliance on physical contact and improving seamless switching efficiency. Because the device's second display component features a side-lit backlight centered on an FPC light strip and a systematic stack of optical films, the system can quickly map gesture semantics to the corresponding backlight driver and optical adjustment strategy when selecting between privacy protection and full-view mode, ensuring a short and stable link between natural interaction, target mode, and optical output. In implementation, after adopting the second candidate, the system first performs a lightweight confidence check and a very short undo window, then executes mode switching: if the target is privacy protection, the partition driver is invoked to generate regionalized PWM signals on the IC side, forming a fine brightness field for each lamp and zone. The emission angle distribution is expanded through a privacy film, light enhancement, and scattering structure, while simultaneously compressing the sensitive viewing angle, achieving clear frontal and suppressed lateral views. If the target is a full viewing angle, the system switches to a side-lit light source path and utilizes reflective side films and reflective film components to suppress light absorption loss, obtaining a bright, uniform image with a wider coverage area. The beneficial effect of this gesture-priority link is to reduce the user's operational costs in scenarios such as meetings, public places, and presentations, keeping mode switching synchronized with actual privacy needs. Simultaneously, relying on partitioned dimming, exposed copper area grounding interference suppression, and mechanical limiting and fixing of optical components, it improves drive stability, anti-interference, and long-term reliability, ultimately achieving more natural human-computer interaction without sacrificing image quality.

[0126] Preferably, please refer to Figure 4 When it is determined that the real-time display mode needs to be switched, the control component switches the real-time display mode, and the target drive control parameters of the FPC component after the switch are obtained, including:

[0127] When it is determined that the real-time display mode needs to be switched, the real-time drive control parameters of the FPC component corresponding to the real-time display mode are obtained, wherein the real-time drive control parameters include the real-time drive current value, the real-time pulse width modulation duty cycle, and the real-time switching transition time.

[0128] Specifically, the real-time drive control parameters include a set of drive parameters for the FPC LED strip currently in operation under the current display mode. The real-time drive current value characterizes the operating current of each LED channel. The real-time pulse width modulation duty cycle is a dimming parameter used to control brightness. Operating parameters are acquired from the FPC components currently in operation to ensure the switching process is based on accurate operating data. The control component incorporates a current detection circuit and a PWM signal monitoring unit to detect the current value and pulse width modulation duty cycle of the LED drive channel in real time, while recording the transition time from the last switch to the current state to reflect the system response rate and output stability. The detected current signal is converted from analog to digital and stored in a register. A comparison with steady-state parameters is used to determine whether the current light emission state is within a stable range. If current fluctuations or abnormal duty cycles are detected, the switching command is paused until the parameters stabilize. By acquiring the real-time drive current value, real-time PWM duty cycle, and real-time switching transition time, the light emission characteristics and timing state of the current FPC component can be accurately characterized, providing a basis for parameter calculation and smooth brightness transition during subsequent switching.

[0129] According to the target display mode, the drive control parameters corresponding to the target display mode are used as the initial drive control parameters, wherein the initial drive control parameters include the initial drive current value, the initial pulse width modulation duty cycle, and the initial switching transition time.

[0130] Specifically, based on the target display mode, a set of standard drive parameters corresponding to that mode is retrieved from the display mode and drive control parameter mapping library as initial drive control parameters. These initial drive control parameters include the initial drive current value, the initial pulse width modulation duty cycle, and the initial switching transition time, which are used to determine the brightness level of the LED array, the luminous flux output rhythm, and the dynamic response speed of mode switching, respectively. The control component associates the target display mode (such as a privacy screen mode or a full-view mode) with the corresponding drive parameters through lookup logic or a calculation model: the privacy screen mode corresponds to a lower drive current and duty cycle to enhance the contrast of the central area and suppress lateral light spill; the full-view mode corresponds to a higher current and an optimized duty cycle to improve edge brightness and achieve wide-angle uniform light output.

[0131] Obtain the usage scenario type and usage location information of the dynamic privacy-protecting side-entry backlight;

[0132] Specifically, when acquiring information about the usage scenario and location of the dynamic privacy-protected side-lit backlight, the system, through the collaborative work of the control component and external sensing modules, identifies the operating environment and installation status of the device, providing a basis for subsequent parameter adjustments. Usage scenario types include indoor, outdoor, and vehicle-mounted scenarios, with significant differences in ambient light intensity, temperature, and visual requirements across different scenarios. Location information includes the device's installation position and angle, reflecting the geometric relationship between the backlight's light emission direction and the user's line of sight. The control component, through communication interfaces with ambient light sensors, temperature sensors, and attitude sensing units, periodically collects data such as external light intensity, ambient temperature, and device tilt angle, and calculates the device's installation posture based on factory calibration information. If the system detects that the light intensity exceeds a set threshold, it identifies it as an outdoor scenario; if the posture angle deviates from the light emission direction, it records it as a tilted installation state. By synchronously acquiring scenario type and location information, the control component can accurately determine the current application environment, providing a data foundation for brightness compensation, transition time adjustment, and anti-glare optimization of drive parameters. The implementation of this step ensures that the backlight can be adaptively controlled according to the actual usage conditions in different environments, which has significant technical effects such as improving display brightness matching, reducing energy consumption and enhancing user visual comfort.

[0133] Based on the usage scenario type and usage location information, the initial drive control parameters are adjusted to obtain the adjusted drive control parameters;

[0134] Specifically, the initial drive current value and pulse width modulation duty cycle are corrected in a level-based manner based on the scene-brightness level correspondence. The angle between the light direction and the user's line of sight is calculated by combining the installation position and installation angle. The brightness compensation coefficient is obtained according to the preset angle-brightness compensation correspondence to correct the current and duty cycle. For situations with high ambient light or strong vehicle vibration, ambient light compensation and anti-vibration slope parameters are superimposed to limit the variation of single-cycle current and duty cycle. For high temperature or heat dissipation-limited conditions, the target current is reduced and the switching transition time is extended according to the temperature derating curve. For installation configurations with insufficient edge brightness, the duty cycle of adjacent channels is micro-allocated and balanced according to the light guide plate scattering distribution table. After the above multi-factor correction, the adjusted drive control parameters are formed to maintain the consistency of center brightness, edge uniformity, and anti-peeping threshold under different scenes and postures, reduce energy consumption and glare, and improve long-term reliability.

[0135] Based on the adjusted drive control parameters, the real-time drive control parameters are corrected to obtain the target drive control parameters.

[0136] Specifically, the difference between the real-time drive current value, the real-time pulse width modulation duty cycle, and the corresponding adjusted target value is first calculated. The difference is then allocated into multi-step increments according to the adjusted switching transition time and slope limit constraints. The current and duty cycle are updated cycle by cycle using a coordinated ramp-up / ramp-down method. During the update process, the fluctuation is monitored based on brightness sensing or current sampling, and over-limit pauses and step rollbacks are performed using thermistor temperature or driver chip temperature as thresholds. When the difference is lower than the convergence threshold and there are no fluctuations exceeding the limit for several consecutive cycles, the final current, duty cycle, and switching transition time are calibrated and written into the register as target drive control parameters. This correction mechanism achieves smooth brightness transition and flicker-free output during mode switching through segmented ramp-up, abnormal over-limit suppression, and convergence criterion locking, avoiding current surges and thermal stress, and ensuring comprehensive optimization of optical consistency, response time, and power consumption control for both privacy and full-view modes.

[0137] Preferably, adjusting the initial drive control parameters according to the usage scenario type and usage location information to obtain the adjusted drive control parameters includes:

[0138] The usage scenario type and usage location information are obtained, wherein the usage scenario type includes indoor scenario, outdoor scenario and vehicle scenario, and the usage location information includes the installation location and installation angle of the dynamic privacy-proof side-entry backlight;

[0139] Specifically, when acquiring usage scenario type and location information, the control component reads preset parameters and installation record information to clarify the application environment and installation status of the backlight. The usage scenario type is pre-set to three categories at the system's factory: indoor, outdoor, and vehicle-mounted. Each scenario corresponds to different ambient light intensities and usage conditions. The control component selects the current scenario type based on the configuration options at startup or external system signals. Location information includes the installation position and installation angle, both determined during equipment assembly by the positioning reference of the mechanical structure and the angle of the mounting groove on the die-cast parts. The system obtains specific parameters by reading installation identification data and factory calibration records. The installation position determines the light-incident orientation of the FPC light strip relative to the light guide plate, and the installation angle defines the spatial relationship between the light output direction and the user's line of sight. This information acquisition process enables the control component to accurately grasp the geometric installation status and application scenario of the equipment, providing a clear foundation for subsequent brightness level determination, light output angle compensation, and drive current adjustment. By completing the retrieval and parsing of environmental and pose data without relying on additional sensing hardware, integrated design of structure and control can be achieved, reducing system complexity and cost, and ensuring the stability of the matching between optical output and the installation structure.

[0140] Based on the usage scenario type and combined with the preset mapping relationship between scenarios and brightness levels, the target brightness level is determined, wherein the target brightness level includes low brightness level, medium brightness level and high brightness level;

[0141] Specifically, based on the factory-defined "scene-brightness level" mapping table, after determining whether the scene is indoor, outdoor, or in-vehicle, the current scene is mapped to a low, medium, or high brightness level using a lookup table: indoor scenes prioritize low brightness levels to reduce glare and power consumption; outdoor scenes prioritize high brightness levels to combat strong environmental reflections; and in-vehicle scenes prioritize medium brightness levels while retaining limited switching capabilities to both high and low levels to balance readability and safety. The mapping table is stored in non-volatile memory and includes minimum / maximum brightness boundaries and hysteresis thresholds. The control component reads and writes the corresponding brightness target when the mode is initiated and the scene is switched, while simultaneously enabling hysteresis and minimum hold time to prevent frequent back-and-forth switching. When there are special limitations in the overall configuration (such as thermal power limits or nighttime appearance requirements), additional constraints in the table are used to clamp the target brightness level within the allowable range. This implementation method ensures the determinism and reproducibility of level selection through fixed mapping and hysteresis control, obtaining brightness targets that match the visual task in different usage scenarios, reducing glare and power consumption, and providing clear boundary conditions for subsequent quantitative settings of current and duty cycle.

[0142] Based on the installation position and angle, the angle between the light emission direction of the dynamic privacy-proof side-entry backlight and the user's line of sight is analyzed to obtain the brightness compensation coefficient.

[0143] Specifically, based on the installation position and angle, the control component determines the spatial normal vector of the light direction based on the assembly calibration data, and establishes a reference vector for the user's line of sight direction with the product's predetermined viewing posture. The angle between the two vectors is calculated as the directional deviation. According to the range of the angle, the brightness compensation coefficient is selected or interpolated according to the preset "angle-compensation" correspondence. The preferred correspondence rule includes a segmented strategy that keeps small angles unchanged, provides linear gain for medium angles, and restricts large angles by an upper limit. The edge weight is added in combination with the installation position (such as upright on a table, wall-mounted with an upward tilt, or embedded with a downward tilt) to correct the in-plane uniformity. The obtained brightness compensation coefficient is used to increase or decrease the drive current and PWM duty cycle in the target mode with the same scale or weight allocation. This compensates for the effective brightness when the line of sight deviates, and limits excessive brightness to control power consumption and glare when the deviation is too large. It takes into account the lateral suppression requirements of the privacy mode and the in-plane consistency of the full-view mode, and finally achieves constant brightness in the main viewing area, balanced edge brightness, and improved overall visual comfort under different installation postures.

[0144] The initial drive current value is adjusted according to the target brightness level and the brightness compensation coefficient to obtain the adjusted drive current value.

[0145] Specifically, based on the target brightness level, the corresponding reference current range and step granularity are determined. After converting the initial drive current value into a reference drive current value according to the level table, the brightness compensation coefficient is used for same-scale increase / decrease or segmented limiting correction. Preferably, candidate current values ​​are obtained according to the rule of small deviation linear compensation, medium deviation proportional amplification, and large deviation upper limit clamping. Boundary checks are performed on the candidate current values ​​according to thermal power limits, long-term reliability derating curves, and electromagnetic compatibility constraints. In the multi-channel structure, a small amount of reverse balancing is performed on adjacent channels in combination with the scattering distribution of the light guide plate to ensure that the in-plane uniformity is not destroyed by excessive brightness. Finally, the constrained current value is quantized and rounded according to the minimum step size of the digital-to-analog converter and the current code allowed by the driver chip and written into the register as the adjusted drive current value output. This adjustment process ensures that the brightness target is achieved while suppressing glare and power consumption increase caused by overcompensation, taking into account thermal stability and device lifespan. In-plane consistency is improved through channel balancing, thereby maintaining constant brightness in the main viewing area under different installation postures and line-of-sight deviations and maintaining the optical effects of both anti-peeping and full-view modes.

[0146] Based on the adjusted drive current value, the initial pulse width modulation duty cycle is synchronously adjusted to obtain the adjusted pulse width modulation duty cycle;

[0147] Specifically, during the synchronous adjustment of the initial pulse width modulation duty cycle, the control component performs an integrated brightness correction process based on the adjusted drive current value. This process uses the brightness balance of the target display mode as a benchmark. First, it determines the required brightness correction range based on the luminous response characteristics of the current FPC components, and then synchronously adjusts the duty cycle to maintain a consistent brightness output with the current change. Based on the luminous efficiency of each FPC LED strip and the light guide plate's coupling characteristics, the duty cycle is fine-tuned channel by channel to ensure that the luminous time distribution matches the energy input after current adjustment. A phased adjustment strategy controls the rising and falling edges of the PWM waveform, thereby avoiding sudden brightness changes and flickering. To further improve display uniformity, the control component also performs proportional balancing of the duty cycle between the edge and center areas based on the energy distribution of the light guide area, ensuring smooth light distribution in all-viewing-angle mode and effective edge suppression in privacy mode. Through this synchronous adjustment mechanism, the system can maintain constant overall brightness and smooth light field changes after current adjustment, significantly improving visual comfort and display stability, while also considering energy consumption control and anti-glare performance.

[0148] Based on the usage scenario type, obtain the correction coefficient for the switching transition time;

[0149] Specifically, different time response strategies are set according to different scenarios to ensure that the mode switching process is both smooth and meets the visual requirements of the application environment. For indoor scenarios, a shorter switching transition time is prioritized to achieve a fast response; for outdoor scenarios, a medium transition time is used and brightness gradual increase control is superimposed to avoid flickering under strong light; for in-vehicle scenarios, a longer transition time is set and a gradient buffer is added to prevent visual abrupt changes during driving from affecting safety. The correction coefficient is directly read from the scene classification table and multiplied by the basic time constant calibrated by the device at the factory to obtain the correction result.

[0150] The initial handover transition time is corrected according to the correction coefficient to obtain the adjusted handover transition time;

[0151] Specifically, based on the initially set time parameters, a correction coefficient is applied to the slope control module of the transition curve to achieve linear or piecewise gradual adjustment of the brightness change rate. When outputting the drive signal, the control component gradually adjusts the current and duty cycle update rate according to the corrected time constant, ensuring smooth and abrupt changes in light output during the start and end phases of switching. The corrected switching transition time not only affects the visual continuity of mode switching but also directly determines the balance of thermal shock and power consumption distribution in the drive system.

[0152] The adjusted drive control parameters are determined based on the adjusted drive current value, the adjusted pulse width modulation duty cycle, and the adjusted switching transition time.

[0153] Specifically, the adjusted drive control parameters are determined based on the adjusted drive current value, pulse width modulation duty cycle, and corrected switching transition time, and these parameters are written into the control register to form the target output command. This parameter set defines the complete drive state after switching, achieving dynamic consistency between electrical output and optical response in different modes. Through the above-mentioned coordinated control, the system can balance response speed and visual stability in various usage scenarios, prevent flickering, glare, and brightness jumps during switching, and improve the smoothness and display quality of transitions between privacy and full-view display modes.

[0154] Preferably, the step of analyzing the angular relationship between the light emission direction of the dynamic privacy-protecting side-entry backlight and the user's line of sight based on the installation position and installation angle to obtain the brightness compensation coefficient includes:

[0155] Based on the installation location and installation angle, the light emission direction vector of the dynamic privacy-protecting side-entry backlight is calculated.

[0156] Specifically, the normal direction of the optical light-emitting surface is determined based on the structural reference plane of the die-cast part and the inner shell. The installation position and angle data are then substituted into the spatial coordinate definition of the light-emitting direction to generate the corresponding three-dimensional direction vector. The installation position reflects the installation orientation of the backlight in the display module or the entire unit (e.g., bottom, side, or top light source), and the installation angle reflects its inclination relative to the horizontal or vertical reference plane. Through combined calculations, the system can obtain the actual light-emitting direction vector of the backlight, which describes the projection path of light energy in space. This step ensures that the system can accurately identify the light propagation direction under different assembly configurations, providing a geometric basis for subsequent line-of-sight angle calculations, thereby ensuring the accuracy of light compensation and brightness distribution calculations.

[0157] Based on the location information, obtain the user's gaze direction vector;

[0158] Specifically, based on the design benchmarks of the device's usage form, the corresponding user gaze reference model is invoked to determine the unit vector of the user's viewing direction in spatial coordinates. The gaze direction has a fixed definition in different application environments; for example, desktop display devices use a horizontal forward-looking direction as the reference, in-vehicle devices use the slightly downward-tilted driver's gaze direction as the reference, and wall-mounted structures correspond to an upward-looking direction. After reading the usage position information, the control component extracts matching direction data from a preset gaze direction parameter table and standardizes it into a gaze vector. This vector is used to compare the spatial angle with the light emission direction vector to ensure that the system can correct brightness according to the actual usage posture, avoiding center brightness attenuation or lateral overexposure due to viewing angle differences.

[0159] The difference between the light emission direction vector and the user's line of sight direction vector is calculated to obtain the target angle between the light emission direction and the user's line of sight direction.

[0160] Specifically, a vector difference calculation is performed on the emitted light direction vector and the user's line-of-sight direction vector to obtain the angle between them in space. This angle characterizes the degree of deviation between the user's viewing direction and the main emission direction of the light. The control component records this angle as the "target angle" and compares it with the factory-calibrated optimal viewing angle range. The larger the target angle, the more significant the deviation between the user and the light direction, and the more significant the intensity attenuation of the light reaching the center of the field of view, requiring corresponding compensation. This step achieves optical geometry quantization, providing a clear angular basis for subsequent brightness compensation calculations, thereby improving the optical adaptation accuracy under different installation conditions.

[0161] The target angle is compared with a preset angle threshold to determine the brightness compensation direction;

[0162] Specifically, the calculated target angle is compared with a system-set angle threshold to determine whether brightness compensation is needed and the direction of compensation. If the target angle is less than the threshold, it means the user's line of sight is basically aligned with the light output direction, and no compensation is needed. If the target angle exceeds the threshold, the compensation type is determined based on the deviation direction: when the user is above or below the light output direction, longitudinal brightness enhancement or suppression is triggered respectively; when the user is to the side of the light output direction, lateral compensation is triggered according to the deviation angle. This determination process allows the system to selectively perform compensation based on the direction of geometric deviation, avoiding unnecessary brightness adjustments and maintaining the balance of the light field and the reasonable distribution of energy consumption.

[0163] Based on the brightness compensation direction and the preset correspondence between the included angle and the brightness compensation value, the brightness compensation coefficient is calculated.

[0164] Specifically, based on the brightness compensation direction, the corresponding compensation interval is extracted from the table corresponding to the angle and compensation value. The actual brightness compensation coefficient is calculated by looking up the table or by interpolation. This table, based on experimental calibration, defines the current gain or loss ratio corresponding to different angle intervals to balance the side-view brightness while ensuring constant center brightness. The system outputs the compensation coefficient to the drive parameter calculation unit to correct the subsequent drive current value and PWM duty cycle, thereby achieving fine adjustment of brightness as the angle changes. This compensation mechanism effectively improves the consistency of the display and privacy protection performance, enabling the backlight system to maintain ideal visual contrast and brightness uniformity under multi-angle observation.

[0165] Preferably, the step of correcting the real-time drive control parameters based on the adjusted drive control parameters to obtain the target drive control parameters includes:

[0166] The difference between the adjusted drive control parameters and the real-time drive control parameters is calculated to obtain the drive control parameter difference.

[0167] Specifically, the current real-time drive parameters and the adjusted drive control parameters are read, and the current value, pulse width modulation duty cycle, and switching transition time of each parameter are compared and the difference is calculated. This difference reflects the degree of deviation between the current output state and the target control state, and serves as the basis for subsequent smoothing correction. After the difference calculation is completed, an independent adjustment path is established for each parameter to ensure that there is no interference between channels and that the output response is controllable during electrical adjustment. Through this step, the switching error can be quantitatively identified, providing basic data for subsequent dynamic adjustment.

[0168] Based on the adjusted switching transition time, the adjustment rate of the drive control parameter difference is allocated to obtain the adjustment step value corresponding to each drive control parameter.

[0169] Specifically, using the corrected switching transition time as a time constraint, the difference in drive parameters is divided into several adjustment steps according to the time ratio, so that each parameter gradually approaches the target value within the switching cycle. To prevent sudden current surges or instantaneous brightness changes, the control component limits the slope of change in a single cycle and sets synchronization ratio coefficients between different parameters to maintain a coordinated relationship between the current and duty cycle adjustment processes. Through the rate allocation mechanism, the system can control the smoothness and stability of the switching process while ensuring response speed, preventing brightness jumps or drive overshoot.

[0170] Based on the adjustment step value, the real-time drive current value and the real-time pulse width modulation duty cycle are corrected in stages to obtain the stage correction parameters;

[0171] Specifically, the real-time current and duty cycle are updated incrementally according to predetermined step values. After each update, a fixed time window is waited to confirm that the output state is stable before proceeding to the next adjustment, forming a multi-stage progressive correction process. The correction value of each stage is filtered and limited to avoid oscillations or overcompensation caused by device response hysteresis. Through staged correction, transient interference can be effectively suppressed while ensuring the final target accuracy, so that the output curve presents a continuous gradual change and ensures a smooth brightness transition during switching.

[0172] Based on the phased correction parameters, the output status of the FPC component is monitored to obtain the brightness fluctuation value and temperature change.

[0173] Specifically, after each correction stage, the output brightness and operating temperature of the FPC component are collected in real time, and the corresponding signals are read through the monitoring circuit inside the control component. The brightness fluctuation value is used to reflect the output light stability, and the temperature change is used to judge the electrical load balance and heat dissipation status. If unstable brightness or excessive temperature rise is detected, the control component automatically reduces the step value of the next stage or extends the switching interval to prevent thermal shock and optical flicker. Through dynamic monitoring, the system realizes closed-loop control of the correction process, ensuring that the update of drive parameters is carried out under safe and stable conditions.

[0174] Based on the brightness fluctuation value and temperature rise change, the stability of the phased correction parameter is judged to obtain the convergence judgment result;

[0175] Specifically, based on the brightness fluctuation value and temperature rise change, a stability index for the current correction state is calculated using the monitoring results. When both the brightness fluctuation value and temperature rise change are below a preset threshold and remain stable, the system is determined to have entered a convergence state. If either parameter exceeds the limit, the next correction stage is delayed and the step rate is reallocated. This judgment process ensures that the adjustment action achieves the target accuracy while avoiding excessive iteration, thus realizing the self-termination of the correction process.

[0176] Based on the convergence judgment result, the current drive current value, pulse width modulation duty cycle and switching transition time are finally corrected to obtain the target drive control parameters.

[0177] Specifically, once the system determines that the correction process has converged, it writes the current, duty cycle, and transition time of the current stage as the final result into the control register, forming a complete set of target driving parameters. This parameter set represents the steady-state output conditions after the switching is completed, and is used to drive the corresponding FPC component into the new display mode. Through this dynamic correction mechanism, the system can achieve stable convergence under multi-parameter coupling conditions, ensuring smooth brightness, balanced thermal load, and electrical safety during the switching process, ultimately achieving consistent optical output and visual continuity.

[0178] In summary, the embodiments of the present invention provide a dynamic privacy-protecting side-entry backlight and its control method.

[0179] It should be clarified that the present invention is not limited to the specific configurations and processes described above and shown in the figures. For the sake of brevity, detailed descriptions of known methods are omitted here. In the above embodiments, several specific steps are described and shown as examples. However, the method process of the present invention is not limited to the specific steps described and shown. Those skilled in the art can make various changes, modifications, and additions, or change the order of steps, after understanding the spirit of the present invention.

[0180] Those skilled in the art will understand that embodiments of the present invention can be provided as methods, systems, or computer program products. Therefore, the present invention can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention can take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0181] This invention is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart illustrations and / or block diagrams. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0182] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0183] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0184] It should also be noted that the exemplary embodiments mentioned in this invention describe methods or systems based on a series of steps or apparatus. However, this invention is not limited to the order of the steps described above; that is, the steps can be performed in the order mentioned in the embodiments, or in a different order, or several steps can be performed simultaneously.

[0185] The above description is merely a specific embodiment of the present invention. Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, modules, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here. It should be understood that the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and these modifications or substitutions should all be covered within the protection scope of the present invention.

Claims

1. A dynamic privacy-protecting side-entry backlight control method, characterized in that, Dynamic privacy-protecting side-entry backlights include: The main frame assembly includes a die-cast part, an inner plastic shell, and a central iron frame. The inner plastic shell is embedded in the plastic shell groove of the die-cast part to support the upper optical components. The central iron frame is located on the outermost side to press and fix the edge and define the boundary of the visible area. The first display component includes a first FPC component, a first light guide plate, an optical film layer, and a reflective film component. The first FPC component is disposed on the lower part of the inner wall of the die-cast part and is opposite to the side light-incident surface of the first light guide plate. The optical film layer includes a light-diffusing film, a light-enhancing film, a DBEF film, and a privacy film stacked sequentially along the light-emitting direction. The second display component includes a second FPC component and a second light guide plate. The second FPC component is disposed on the upper part of the inner wall of the die-cast part and is opposite to the side light-incident surface of the second light guide plate. The second light guide plate is used to achieve uniform light output from all angles. The control component is electrically connected to the first FPC component and the second FPC component respectively, and is used to output mutually exclusive drive signals to the LED light-emitting units carried on the first FPC component and the LED light-emitting units carried on the second FPC component, so as to switch between full-view display mode and privacy display mode. The control method includes: Obtain user-inputted display mode control commands and real-time display mode; According to the display mode control command, a target display mode is obtained, wherein the target display mode includes a full-view display mode and a privacy display mode; Based on the real-time display mode and the target display mode, determine whether it is necessary to switch the real-time display mode; When it is determined that the real-time display mode needs to be switched, the real-time display mode is switched through the control component, and the target drive control parameters of the FPC component after the switch are obtained. Based on the target driving control parameters, the FPC component corresponding to the target display mode is driven to light up, thereby achieving privacy protection display or full-view display. When it is determined that the real-time display mode needs to be switched, the control component switches the real-time display mode, and the target drive control parameters of the FPC component after the switch are obtained, including: When it is determined that the real-time display mode needs to be switched, the real-time drive control parameters of the FPC component corresponding to the real-time display mode are obtained, wherein the real-time drive control parameters include the real-time drive current value, the real-time pulse width modulation duty cycle, and the real-time switching transition time. According to the target display mode, the drive control parameters corresponding to the target display mode are used as the initial drive control parameters, wherein the initial drive control parameters include the initial drive current value, the initial pulse width modulation duty cycle, and the initial switching transition time. Obtain the usage scenario type and usage location information of the dynamic privacy-protecting side-entry backlight; Based on the usage scenario type and usage location information, the initial drive control parameters are adjusted to obtain the adjusted drive control parameters; Based on the adjusted drive control parameters, the real-time drive control parameters are corrected to obtain the target drive control parameters; The step of adjusting the initial drive control parameters according to the usage scenario type and usage location information to obtain the adjusted drive control parameters includes: The usage scenario type and usage location information are obtained, wherein the usage scenario type includes indoor scenario, outdoor scenario and vehicle scenario, and the usage location information includes the installation location and installation angle of the dynamic privacy-proof side-entry backlight; Based on the usage scenario type and combined with the preset mapping relationship between scenarios and brightness levels, the target brightness level is determined, wherein the target brightness level includes low brightness level, medium brightness level and high brightness level; Based on the installation position and angle, the angle between the light emission direction of the dynamic privacy-proof side-entry backlight and the user's line of sight is analyzed to obtain the brightness compensation coefficient. The initial drive current value is adjusted according to the target brightness level and the brightness compensation coefficient to obtain the adjusted drive current value. Based on the adjusted drive current value, the initial pulse width modulation duty cycle is synchronously adjusted to obtain the adjusted pulse width modulation duty cycle; Based on the usage scenario type, obtain the correction coefficient for the switching transition time; The initial handover transition time is corrected according to the correction coefficient to obtain the adjusted handover transition time; The adjusted drive control parameters are determined based on the adjusted drive current value, the adjusted pulse width modulation duty cycle, and the adjusted switching transition time.

2. The dynamic privacy-protecting side-entry backlight control method according to claim 1, characterized in that, The first FPC component and the second FPC component are fixed to the lower part of the inner wall of the die-casting part with the embossed line on the inner side of the die-casting part as the alignment reference; the back of the first FPC component and the back of the second FPC component are respectively thermally coupled to the back heat sink through thermally conductive adhesive, and respectively led out to the independent electrical interface of the control component to achieve independent drive without interference.

3. The dynamic privacy-protecting side-entry backlight control method according to claim 1, characterized in that, The dynamic privacy-protecting side-entry backlight also includes: The upper light guide plate reflective film is attached to the surface of the inner shell and serves as the attachment base and reflective interface of the upper light guide plate. The inner edge of the upper light guide plate reflective film is aligned with the outer edge of the central iron frame boss and a circumferential safety gap is reserved to avoid intrusion into the visible area.

4. The dynamic privacy-protecting side-entry backlight control method according to claim 1, characterized in that, The display mode control instructions include target button instructions and target gesture instructions, and obtaining the target display mode according to the display mode control instructions includes: If the display mode control instruction only includes the target key instruction, then according to the first mapping relationship between the preset key instruction and the display mode, the target key instruction is mapped to the corresponding target display mode; If the display mode control instruction only includes the target gesture instruction, then the gesture instruction is identified to obtain the gesture type; The gesture type is compared with each gesture in a preset reference gesture set. If the gesture type is a gesture in the reference gesture set, the target gesture command is mapped to the corresponding target display mode according to the second mapping relationship between the preset gesture command and the display mode. If the display mode control command includes a target button command and a target gesture command, then the target display mode is determined based on the target button command and the target gesture command, combined with a preset command priority.

5. The dynamic privacy-protecting side-entry backlight control method according to claim 4, characterized in that, If the display mode control command includes a target button command and a target gesture command, then based on the target button command and the target gesture command, and in conjunction with a preset command priority, the target display mode is determined to include: Based on the first mapping relationship, the target key instruction is mapped to the corresponding first candidate display mode; The gesture type corresponding to the target gesture instruction is compared with each gesture in the preset reference gesture set. If the gesture type is a gesture in the reference gesture set, the target gesture instruction is mapped to the corresponding second candidate display mode according to the second mapping relationship. The first candidate display mode and the second candidate display mode are compared. If the first candidate display mode and the second candidate display mode are the same, the first candidate display mode is taken as the target display mode. If the first candidate display mode and the second candidate display mode are different, then obtain the usage scenario type of the dynamic privacy-proof side-entry backlight; Based on the usage scenario type, determine the first priority corresponding to the button command and the second priority corresponding to the gesture command; If the first priority is greater than the second priority, then the first candidate display mode is taken as the target display mode; If the first priority is not greater than the second priority, then the second candidate display mode is taken as the target display mode.

6. The dynamic privacy-protecting side-entry backlight control method according to claim 1, characterized in that, The process involves analyzing the angle between the light emission direction of the dynamic privacy-protecting side-entry backlight and the user's line of sight, based on the installation location and angle, to obtain a brightness compensation coefficient including: Based on the installation location and installation angle, the light emission direction vector of the dynamic privacy-protecting side-entry backlight is calculated. Based on the location information, obtain the user's gaze direction vector; The difference between the light emission direction vector and the user's line of sight direction vector is calculated to obtain the target angle between the light emission direction and the user's line of sight direction. The target angle is compared with a preset angle threshold to determine the brightness compensation direction; Based on the brightness compensation direction and the preset correspondence between the included angle and the brightness compensation value, the brightness compensation coefficient is calculated.

7. The dynamic privacy-protecting side-entry backlight control method according to claim 6, characterized in that, The step of correcting the real-time drive control parameters based on the adjusted drive control parameters to obtain the target drive control parameters includes: The difference between the adjusted drive control parameters and the real-time drive control parameters is calculated to obtain the drive control parameter difference. Based on the adjusted switching transition time, the adjustment rate of the drive control parameter difference is allocated to obtain the adjustment step value corresponding to each drive control parameter. Based on the adjustment step value, the real-time drive current value and the real-time pulse width modulation duty cycle are corrected in stages to obtain the stage correction parameters; Based on the phased correction parameters, the output status of the FPC component is monitored to obtain the brightness fluctuation value and temperature change. Based on the brightness fluctuation value and temperature rise change, the stability of the phased correction parameter is judged to obtain the convergence judgment result; Based on the convergence judgment result, the current drive current value, pulse width modulation duty cycle and switching transition time are finally corrected to obtain the target drive control parameters.

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