Anti-peeping display module and vehicle-mounted display device

Abstract

The utility model relates to the technical field of display, and discloses a peep-proof display module and a vehicle-mounted display device, a cover plate, a TFT (Thin Film Transistor) liquid crystal display screen, a first peep-proof liquid crystal display screen, a second peep-proof liquid crystal display screen and a backlight are sequentially stacked from top to bottom, and a 1 / 2 wavelength phase difference film is arranged on the upper side of the first peep-proof liquid crystal display screen. A fourth polaroid is arranged on the lower side of the second peep-proof liquid crystal screen, and a third polaroid is arranged on the upper side of the second peep-proof liquid crystal screen or the lower side of the first peep-proof liquid crystal screen, so that the peep-proof mode can be quickly switched by applying voltage to the peep-proof liquid crystal screen, the displayed visual angle is obviously narrowed at the moment, and the peep-proof purpose is achieved; the problem that the peep-proof effect is not ideal under a large view angle in the prior art is solved, the peep-proof liquid crystal screen can be switched to the sharing mode without applying voltage to the peep-proof liquid crystal screen, a wide display view angle is shown at the moment, and therefore the good peep-proof effect on a driving position can be achieved, the high contrast ratio can be kept, and better driving experience can be brought.

Description

TECHNICAL FIELD

[0001] The utility model relates to display technical field especially relates to a kind of anti-peep display module and vehicle-mounted display device. BACKGROUND

[0002] With the continuous progress of display technology, liquid crystal display has shown excellent viewing angle breadth, especially on the display screen of the central control co-driver position, whether the driver or the passenger, from the different viewing angle of each other, can clearly enjoy the display content. However, in this particular scenario of driving, if the driver is disturbed by the content of the display screen of the central control co-driver position, it will undoubtedly affect the driving safety, therefore, the application of anti-peep technology becomes imperative.

[0003] Recently, a brand new anti-peep technology emerges as the times require, its applicable scene is extremely extensive, and it has flexible switching function of anti-peep function, aims to provide more high-quality driving and riding experience for driver and other users. Specifically, when user is in the environment needing to share information, it can be easily switched to sharing mode, at this time, the display screen will show wide viewing angle, which is convenient for information transmission and exchange;When user is in the environment needing to protect privacy or avoid interference to the driver, it can be quickly switched to anti-peep mode, the viewing angle of display screen will be significantly narrowed, and the anti-peep purpose is achieved.

[0004] However, the switchable anti-peep technology on the market still has deficiencies in anti-peep effect. Specifically, in the-25° small viewing angle anti-peep state relative to the vertical angle, when the brightness ratio is less than 1.5%, the brightness ratio in the 40° to 60° large viewing angle range of the driving position is higher than 0.5%, which means that the anti-peep effect under large viewing angle is poor.

[0005] Therefore, in order to further improve the anti-peep performance, it is particularly urgent to develop a new technology that can realize ultra-narrow viewing angle anti-peep.

[0006] The above information is given as background information only to assist with understanding the present disclosure, and does not establish or acknowledge that any of the above information can be used as prior art with respect to the present disclosure. SUMMARY

[0007] The utility model provides a kind of anti-peep display module and vehicle-mounted display device to solve the problems in prior art.

[0008] To achieve the above purpose, the utility model provides the following technical scheme:

[0009] Firstly, the utility model provides an anti-peep display module, which comprises a cover plate, a TFT liquid crystal display, an anti-peep liquid crystal screen and a backlight.

[0010] The cover plate, the TFT liquid crystal display screen, the peep-proof liquid crystal screen and the backlight are sequentially stacked from top to bottom.

[0011] The peep-proof liquid crystal screen comprises a first peep-proof liquid crystal screen and a second peep-proof liquid crystal screen.

[0012] The first peep-proof liquid crystal screen and the second peep-proof liquid crystal screen are sequentially stacked from top to bottom.

[0013] The upper side of the first peep-proof liquid crystal screen is provided with a 1 / 2 wavelength phase difference film.

[0014] The lower side of the second peep-proof liquid crystal screen is provided with a fourth polaroid.

[0015] The upper side of the second peep-proof liquid crystal screen or the lower side of the first peep-proof liquid crystal screen is provided with a third polaroid.

[0016] Further, in the peep-proof display module, the peep-proof liquid crystal screen is a TN twisted nematic type.

[0017] Further, in the peep-proof display module, the cell gap of the peep-proof liquid crystal screen is 4u-15um, the twist angle is 60°-120°, and the retardation is 500-2000nm.

[0018] Further, in the peep-proof display module, when the upper side of the second peep-proof liquid crystal screen is provided with the third polaroid, the third polaroid is provided with a C-Plate compensation film, or the fourth polaroid is provided with a C-Plate compensation film.

[0019] Further, in the peep-proof display module, when the lower side of the first peep-proof liquid crystal screen is provided with a third polaroid, the third polaroid is provided with a C-Plate compensation film.

[0020] Further, in the peep-proof display module, the retardation of the C-Plate compensation film is 50nm-300nm.

[0021] The optical compensation value of the C-Plate compensation film and the optical path difference value of the liquid crystal layer of the peep-proof liquid crystal screen are mutually compensated.

[0022] Further, the peep-proof display module further comprises a first polaroid and a second polaroid.

[0023] The first polaroid is arranged on the upper side of the TFT liquid crystal display screen.

[0024] The second polaroid is arranged on the lower side of the TFT liquid crystal display screen.

[0025] Further, in the privacy display module, the polarizing degrees of the first, second, third and fourth polarizing plates are greater than 99.9%.

[0026] Further, in the privacy display module, the upper side of the cover plate is coated with an anti-glare coating and an anti-reflection layer.

[0027] In a second aspect, the utility model provides a vehicle-mounted display device which comprises the privacy display module provided in the first aspect.

[0028] Compared with the prior art, the utility model has the following beneficial effects:

[0029] The privacy display module and the vehicle-mounted display device have the following advantages: when in an environment where privacy needs to be protected or disturbance to the driver needs to be avoided, the privacy display mode is rapidly switched by applying voltage to the privacy liquid crystal screen, the display viewing angle is significantly narrowed, the privacy display purpose is achieved, and the problem of poor privacy display effect under a large viewing angle in the prior art is overcome; when in an environment where information needs to be shared, the sharing mode is switched by not applying voltage to the privacy liquid crystal screen, a wide display viewing angle is exhibited, and information transmission and exchange are facilitated, so that good privacy display effect on the driving position is achieved, high contrast is maintained, and better driving experience is brought.

[0030] The utility model has other characteristics and advantages which will be apparent or will be described in detail in the drawings and the following specific embodiments incorporated herein, which together serve to explain the specific principles of the utility model. BRIEF DESCRIPTION OF DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the utility model or the prior art, the drawings needed to be used in the embodiment or the prior art description will be briefly introduced below, and obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings can be obtained according to these drawings without creative labor.

[0032] Figure 1 is a structural schematic view of a privacy display module provided in the first embodiment of the utility model;

[0033] Figure 2 is a structure schematic diagram two of the peep-proof display module provided by the embodiment one of the utility model;

[0034] Figure 3 is a structure schematic diagram three of the peep-proof display module provided by the embodiment one of the utility model;

[0035] Figure 4 is the C-Plate compensation film principle explanation mentioned by the embodiment one of the utility model.

[0036] Reference signs:

[0037] Cover plate 1, TFT liquid crystal display screen 2, first peep-proof liquid crystal screen 3, second peep-proof liquid crystal screen 4, backlight 5, phase difference film 6, fourth polaroid 7, third polaroid 8, C-Plate compensation film 9, first polaroid 10, second polaroid 11, adhesive layer 12. Specific implementation

[0038] In order to describe possible application scenarios, technical principles, specific implementation schemes, and achieve the purposes and effects of the present application, the following specific embodiments are combined with the drawings for detailed description. The embodiments described in this paper are only used to more clearly illustrate the technical solutions of the present application, and therefore cannot limit the protection scope of the present application.

[0039] In this paper, the term "embodiment" means that the specific features, structures or characteristics described in conjunction with the embodiment can be included in at least one embodiment of the present application. The term "embodiment" appearing in various places in the specification does not necessarily refer to the same embodiment, and does not particularly limit its independence or association with other embodiments. In principle, in this application, as long as there is no technical contradiction or conflict, the technical features mentioned in each embodiment can be combined in any way to form a corresponding implementable technical solution.

[0040] Unless otherwise defined, the meaning of the technical terms used in this paper is the same as that generally understood by those skilled in the art to which the present application belongs; the use of related terms in this paper is only for the purpose of describing specific embodiments, and is not intended to limit the present application.

[0041] In the description of the present application, the word "and / or" is a description of the logical relationship between the objects, which means that there can be three relationships, for example, A and / or B, which means that there are three cases: A exists, B exists, and A and B exist at the same time. In addition, the character " / " in this paper generally represents that the associated objects before and after are a "or" logical relationship.

[0042] In the present application, the terms such as "first" and "second" are merely used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual number, primary or secondary, or order relationship between the entities or operations.

[0043] In the present application, the "includes", "contains", "has", or other similar expressions used in the statements are intended to cover non-exclusive inclusion, and these expressions do not exclude the presence of additional elements in the process, method or product comprising the elements, so that the process, method or product comprising a series of elements can not only include those defined elements, but also include other elements not explicitly listed, or also include elements inherent to such process, method or product.

[0044] In the present application, the expressions such as "greater than", "less than", "exceed" are understood as not including the number; the expressions such as "above", "below", "within" are understood as including the number. In addition, in the description of the embodiments of the present application, the meaning of "multiple" is more than two (including two), and similar expressions related to "multiple" are also understood in this way, such as "multiple groups", "multiple times", etc., unless otherwise explicitly specified.

[0045] In the description of the embodiments of the present application, the spatial-related expressions used, such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "vertical", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. The indicated orientation or position relationship is based on the orientation or position relationship shown in the specific embodiment or the drawing, and is only for the convenience of describing the specific embodiments of the present application or for the reader to understand, and does not indicate or imply that the indicated device or component must have a specific position, a specific orientation, or be constructed or operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0046] Unless otherwise explicitly specified or limited, in the description of the embodiments of the present application, the terms "mount", "connect", "connect", "fix", "set", etc. should be understood broadly. For example, the "connection" can be a fixed connection, or a detachable connection, or an integral setting; it can be a mechanical connection, or an electrical connection, or a communication connection; it can be directly connected, or indirectly connected through an intermediate medium; it can be the internal communication or interaction relationship of two elements. For those skilled in the art to which the present application belongs, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0047] Embodiment one

[0048] In view of the defects in the prior art described above, the applicant, based on years of rich practical experience and professional knowledge in this field, and with the use of academic principles, actively conducts research and innovation in the hope of creating a technology that can solve the defects in the prior art. After continuous research, design, and repeated trial of samples and improvement, the present utility model is finally created, which has practical value.

[0049] Please refer to Figures 1-3 The utility model embodiment provides a kind of anti-peep display module, including cover plate 1, TFT liquid crystal display 2, anti-peep liquid crystal screen and backlight 5;In this structure,

[0050] The cover plate 1, TFT liquid crystal display 2, anti-peep liquid crystal screen and backlight 5 follow the order from top to bottom, and are stacked, ensuring the stability of the module structure and the realization of the function.

[0051] Further, the anti-peep liquid crystal screen is ingeniously subdivided into a first anti-peep liquid crystal screen 3 and a second anti-peep liquid crystal screen 4, both of which are also stacked in the order from top to bottom, together constituting the crucial anti-peep function layer in the module.

[0052] On the upper side of the first anti-peep liquid crystal screen 3, a 1 / 2 wavelength phase difference film 6 is innovatively provided, which can accurately regulate the phase of light, thereby optimizing the display effect.

[0053] At the same time, a fourth polarizing plate 7 is installed on the lower side of the second anti-peep liquid crystal screen 4, and a third polarizing plate 8 is ingeniously configured on the upper side of the second anti-peep liquid crystal screen 4 or the lower side of the first anti-peep liquid crystal screen 3. The two polarizing plates work together to further improve the optical performance and image quality of the module.

[0054] It is particularly worth mentioning that when the module is in an environment that requires strict privacy protection or to avoid unnecessary interference to the driver, by applying appropriate voltage to the anti-peep liquid crystal screen, the module will quickly and effectively switch to the anti-peep mode. In this mode, the liquid crystal molecules will be arranged at a certain angle, and the liquid crystal layer will produce a phase difference, causing the polarization direction of the light to change, and part of the light will be effectively blocked, thereby significantly narrowing the display angle, perfectly achieving the purpose of anti-peep. This ingenious design overcomes the technical problem of unsatisfactory anti-peep effect at large viewing angles in the prior art.

[0055] On the contrary, when the module is in an open environment that requires extensive sharing of information, it is only necessary to stop applying voltage to the anti-peep liquid crystal screen, and the module can be switched to the sharing mode. In this mode, the liquid crystal molecules will be arranged in parallel, and the light will smoothly pass through the liquid crystal layer and be emitted, thereby exhibiting a wide display angle, greatly facilitating the transmission and exchange of information.

[0056] In summary, the anti-peep display module provided by the utility model not only can realize excellent anti-peep effect in the driving position, but also maintains high contrast, and brings more excellent driving experience for users. The innovative design not only meets the dual needs of privacy protection and information sharing in the modern driving environment, but also opens up a new direction and possibility for the development of display technology.

[0057] In one embodiment of the present embodiment, the anti-peep liquid crystal screen adopts TN (Twisted Nematic) liquid crystal material which is mature in technology and stable in performance. TN type liquid crystal is widely used in the display field due to its fast response speed, low cost and easy manufacturing.

[0058] Further, in order to optimize the anti-peep effect and display performance, the key parameters of the anti-peep liquid crystal screen are finely designed in the present embodiment. Specifically, the cell gap of the anti-peep liquid crystal screen is set in the range of 4u-15um, which ensures that the module can exhibit better anti-peep effect in different environments.

[0059] Meanwhile, the twist angle of the anti-peep liquid crystal screen in the present embodiment is set to 60°-120°. The selection of this angle range aims to realize precise control of the polarization state of light by adjusting the arrangement direction of liquid crystal molecules, thereby further enhancing the anti-peep effect.

[0060] In addition, in order to further improve the display quality, the retardation of the anti-peep liquid crystal screen is also optimized in the present embodiment and is set in the range of 500-2000nm. As one of the important indicators for measuring the performance of liquid crystal material, the retardation directly affects the contrast and anti-peep effect of the displayed image. By finely designing the retardation, the present embodiment aims to ensure that the module can still maintain high contrast and better anti-peep effect in the anti-peep mode.

[0061] In summary, the present embodiment successfully creates an anti-peep display module with excellent performance and significant anti-peep effect by adopting TN twisted nematic liquid crystal material and carefully designing the key parameters such as cell gap, twist angle and retardation.

[0062] In one specific embodiment of the present embodiment, in order to further improve the performance and effect of the anti-peep display module, the C-Plate compensation film 9 is innovatively introduced as a key component. As a specific optical compensation material, C-Plate compensation film can effectively optimize the polarization state of light, thereby realizing control of different viewing angle brightness.

[0063] Regarding the specific setting position of the C-Plate compensation film 9, the present embodiment provides multiple flexible design schemes to adapt to different application scenarios and needs. Specifically:

[0064] In one aspect, when the upper side of the second privacy liquid crystal screen 4 is configured with the third polarizer 8, a C-Plate compensation film 9 can be arranged on the third polarizer 8, as shown in FIG. 4A, or a C-Plate compensation film 9 can be arranged on the fourth polarizer 7, as shown in FIG. 4B. Both of these two design schemes can effectively utilize the optical compensation characteristics of the C-Plate compensation film to improve the privacy effect. Figure 1 Figure 2

[0065] In another aspect, when the lower side of the first privacy liquid crystal screen 3 is configured with the third polarizer 8, a C-Plate compensation film 9 can be arranged on the third polarizer 8, as shown in FIG. 5. This design scheme can also significantly improve the performance of the privacy display module. Figure 3

[0066] It should be particularly noted that the C-Plate compensation film 9 in the present embodiment has a precise retardation control, and the retardation is set in the range of 50 nm-300 nm. The selection of this retardation is intended to ensure that the optical compensation value of the C-Plate compensation film and the optical path difference value of the liquid crystal layer of the privacy liquid crystal screen can be matched and effectively compensated, so as to further optimize the polarization state of the light.

[0067] Specifically, when no C-Plate compensation film 9 is arranged, the light source will form elliptical polarization after passing through the privacy liquid crystal screen. However, since the polarizer (usually a linear polarizer) on the lower side of the TFT liquid crystal display screen 2 cannot completely block part of the light in the elliptical polarization, a certain light leakage phenomenon will occur, affecting the privacy effect. When the C-Plate compensation film 9 is arranged, as shown in FIG. 6, the light source forms linear polarization (point A) after passing through the polarizer 4 on the lower side of the second privacy liquid crystal screen 4 (i.e., the privacy liquid crystal screen 2), forms elliptical polarization after passing through the second privacy liquid crystal screen 4, and still forms elliptical polarization after passing through the C-Plate compensation film. However, the ellipticity of the two is different, and finally linear polarization is formed after passing through the first privacy liquid crystal screen 3, which is blocked by the third polarizer 8 on the lower side of the first privacy liquid crystal screen 3 (i.e., the privacy liquid crystal screen 1), achieving a better privacy effect. Figure 4

[0068] In summary, the present embodiment successfully creates a privacy display module with more outstanding performance and more significant privacy effect by introducing the C-Plate compensation film 9 and flexibly designing the arrangement position thereof. This innovative design not only meets the strict requirements of modern display technology for high precision, high stability and high performance, but also brings users a more excellent visual experience and privacy protection.

[0069] ​​​​In a more detailed embodiment of the present embodiment, the structure of the privacy display module is further improved and upgraded. Specifically, in addition to the components mentioned earlier, the present embodiment innovatively introduces a first polarizer 10 and a second polarizer 11 to further improve the display performance of the module.

[0070] Regarding the specific setting position of the first polarizer 10, it is selected to be set on the upper side of the TFT liquid crystal display screen 2.

[0071] The second polarizer 11 is set on the lower side of the TFT liquid crystal display screen 2. The front polarizer and the bottom polarizer work together to control the polarization state of light and achieve good display effect.

[0072] In an embodiment of the present embodiment, more stringent requirements are placed on the performance of the polarizers in the privacy display module. Specifically, the polarization degree of the first polarizer 10, the second polarizer 11, the third polarizer 8, and the fourth polarizer 7 is set to be greater than 99.9%.

[0073] Polarization degree, as one of the important indicators to measure the performance of polarizers, directly affects the contrast, color saturation, and the pros and cons of the privacy effect of the display image.

[0074] In addition, polarizers with high polarization degree can also improve the stability and durability of the module. In the long-term use process, even in the face of complex environmental conditions and light source interference, polarizers with high polarization degree can maintain stable performance, ensuring that the module can always provide users with excellent display effect and privacy protection.

[0075] In summary, by setting the polarization degree of the first polarizer 10, the second polarizer 11, the third polarizer 8, and the fourth polarizer 7 to be greater than 99.9%, the present embodiment successfully creates a privacy display module with more excellent performance and display effect. This innovative design not only meets the strict requirements of modern display technology for high precision, high stability, and high performance, but also brings users a more excellent visual experience and privacy protection.

[0076] In an embodiment of the present embodiment, the design of the cover plate 1 is further optimized and upgraded. Specifically, an anti-glare coating and an anti-reflection layer are cleverly coated on the upper side of the cover plate 1, aiming to bring users a more clear and comfortable visual experience.

[0077] The design principle of the anti-glare coating is to form a micro-film layer structure with uneven surface on the polarizing sheet. This structure can effectively diffuse the incident light, thereby reducing the brightness difference at different angles. When the user observes the display screen at different angles, the anti-glare coating can ensure that the light is more evenly distributed, reducing the occurrence of glare, making the display image clearer and softer.

[0078] The anti-reflection layer further reduces reflection and improves light transmittance. In strong light environment, the surface of the display screen is easy to form reflected light, making it difficult for the user to clearly observe the display content. The anti-reflection layer can effectively reduce the generation of such reflected light, so that more light can penetrate the cover plate and enter the user's eyes. In this way, even in strong light environment, the user can easily read the display content, greatly improving the readability of the display screen.

[0079] It is worth noting that the introduction of the anti-glare coating and the anti-reflection layer does not increase the complexity or cost of the module, but rather optimizes the light transmission and reflection characteristics, improving the overall display performance and user experience. This innovative design not only meets the strict requirements of modern display technology for high precision, high definition and high performance, but also brings users a more comfortable and convenient visual experience.

[0080] In summary, by coating the anti-glare coating and the anti-reflection layer on the upper side of the cover plate 1, a privacy display module with superior performance and excellent display effect is successfully created. This design not only improves the display performance and readability of the module, but also brings users a clearer and more comfortable visual experience.

[0081] It can be understood that the privacy display module also includes an adhesive layer 12, which plays a crucial role in the module. It is responsible for tightly and firmly bonding various components together, ensuring the stability and reliability of the module during long-term use.

[0082] Specifically, the adhesive layer 12 can be selected from OCA (Optically Clear Adhesive, optical adhesive), OCR water adhesive layer or AIR BONDING layer, etc. These different types of adhesive layers have their own advantages in performance and can meet the requirements of high precision, high transparency and strong adhesion of the module.

[0083] In Figure 1 , the adhesive layer 12 is provided between the cover plate 1 and the first polarizing sheet 10, between the phase difference film 6 and the second polarizing sheet 11, and between the first privacy liquid crystal screen 3 and the C-Plate compensation film 9.

[0084] In Figure 2 In the embodiment, the adhesive layer 12 is arranged between the cover plate 1 and the first polarizer 10, the adhesive layer 12 is arranged between the phase difference film 6 and the second polarizer 11, and the adhesive layer 12 is arranged between the second privacy liquid crystal screen 4 and the C-Plate compensation film 9.

[0085] In Figure 3 In the embodiment, the adhesive layer 12 is arranged between the cover plate 1 and the first polarizer 10, the adhesive layer 12 is arranged between the phase difference film 6 and the second polarizer 11, and the adhesive layer 12 is arranged between the second privacy liquid crystal screen 4 and the C-Plate compensation film 9.

[0086] In summary, the embodiment successfully creates a privacy display module with more stable structure and more excellent performance by introducing the adhesive layer 12 as a key component and carefully planning the setting position and type selection of the adhesive layer 12 in the module. The innovative design not only improves the overall performance and reliability of the module, but also brings users a more high-quality and stable visual experience.

[0087] Although the terms such as cover plate and backlight are used more in the present application, the possibility of using other terms is not excluded. The use of these terms is only for more convenient description and explanation of the essence of the utility model; any kind of additional limitation is contrary to the spirit of the utility model.

[0088] The privacy display module and the vehicle-mounted display device provided by the embodiment of the utility model, through from top to bottom setting cover plate, TFT liquid crystal display screen, first privacy liquid crystal screen and second privacy liquid crystal screen and backlight successively and setting phase difference film of 1 / 2 wavelength on the upside of first privacy liquid crystal screen, setting fourth polarizer on the downside of second privacy liquid crystal screen, setting third polarizer on the upside of second privacy liquid crystal screen or the downside of first privacy liquid crystal screen, when being in the environment needing to protect privacy or avoid causing disturbance to the driver, then through applying voltage to privacy liquid crystal screen and switching to privacy mode quickly, the display angle will be narrowed significantly at this time, and the privacy purpose is achieved, and the problem that the privacy effect under large angle of view is not ideal in the prior art is overcome, and when being in the environment needing to share information, can easily switch to sharing mode by not applying voltage to privacy liquid crystal screen, and a wide display angle will be shown at this time, and the information transmission and exchange are facilitated, so that the privacy effect on the driving position can be realized, the high contrast can be maintained, and better driving experience can be brought.

[0089] Embodiment Two

[0090] The embodiment two of the utility model provides a vehicle-mounted display device, including the privacy display module provided by the above-mentioned embodiment one.

[0091] The vehicle-mounted display device of the embodiment not only has excellent display effect, but also realizes excellent privacy protection function, and brings more safe and comfortable visual experience for the driver.

[0092] Specifically, the vehicle-mounted display device can be applied to the instrument panel, central control display screen and co-driver display screen of the vehicle. In these scenes, the high definition, high contrast and excellent privacy protection effect of the privacy display module can ensure that the driver can clearly observe the display content under different lighting conditions, and effectively prevent peeping from the side, protecting the safety of the driver.

[0093] In addition, the vehicle-mounted display device of the embodiment also inherits many advantages of the privacy display module in embodiment one, such as stable structure, excellent performance, high reliability, etc. These advantages enable the vehicle-mounted display device to maintain good performance during long-term use, reducing maintenance and replacement costs caused by failure or damage.

[0094] It is worth mentioning that the vehicle-mounted display device of the embodiment can also be customized and optimized according to specific application scenarios and requirements. For example, in the instrument panel scenario, the display content and layout can be further optimized to provide more intuitive and easy-to-read driving information; in the central control display screen and co-driver display screen scenarios, touch function, voice recognition and other interaction methods can be added to improve the operation convenience of users.

[0095] In summary, the vehicle-mounted display device with excellent performance and safety and reliability is successfully created by introducing the privacy display module provided in embodiment one. This innovative design not only meets the strict requirements of modern vehicles for high-precision, high-definition and high-performance display technology, but also brings more high-quality and safe visual experience for the driver.

[0096] Finally, it should be noted that although the above embodiments have been described in the specification and drawings of the present application, the patent protection scope of the present application should not be limited. Any equivalent structure or equivalent flow replacement or modification based on the essential concept of the present application, using the content described in the specification and drawings, directly or indirectly implementing the technical solutions of the above embodiments in other related technical fields, etc. are all included in the patent protection scope of the present application.

Claims

1. A privacy display module, characterized in that, It comprises a cover plate (1), a TFT liquid crystal display screen (2), a privacy liquid crystal screen and a backlight (5), wherein The cover plate (1), the TFT liquid crystal display screen (2), the privacy liquid crystal screen and the backlight (5) are sequentially stacked from top to bottom. The privacy liquid crystal screen comprises a first privacy liquid crystal screen (3) and a second privacy liquid crystal screen (4). The first privacy liquid crystal screen (3) and the second privacy liquid crystal screen (4) are sequentially stacked from top to bottom. The upper side of the first privacy liquid crystal screen (3) is provided with a 1 / 2 wavelength phase difference film (6). The lower side of the second privacy liquid crystal screen (4) is provided with a fourth polarizer (7). The upper side of the second privacy liquid crystal screen (4) or the lower side of the first privacy liquid crystal screen (3) is provided with a third polarizer (8). 2.The privacy display module of claim 1, wherein, The privacy liquid crystal screen is a TN twisted nematic type. 3.The privacy display module of claim 2, wherein, The cell gap of the privacy liquid crystal screen is 4u-15um, the twist angle is 60°-120°, and the retardation is 500-2000nm. 4.The privacy display module of claim 1, wherein, When the upper side of the second privacy liquid crystal screen (4) is provided with the third polarizer (8), the third polarizer (8) is provided with a C-Plate compensation film (9), or the fourth polarizer (7) is provided with a C-Plate compensation film (9). 5.The privacy display module of claim 1, wherein, When the lower side of the first privacy liquid crystal screen (3) is provided with a third polarizer (8), the third polarizer (8) is provided with a C-Plate compensation film (9). 6.The privacy display module of claim 4 or 5, wherein, The retardation of the C-Plate compensation film (9) is 50nm-300nm. The optical compensation value of the C-Plate compensation film (9) and the liquid crystal layer optical path difference value of the privacy liquid crystal screen are mutually compensated. 7.The privacy display module of claim 4 or 5, wherein, It further comprises a first polarizer (10) and a second polarizer (11). The first polarizer (10) is arranged on the upper side of the TFT liquid crystal display screen (2). The second polarizer (11) is arranged on the lower side of the TFT liquid crystal display screen (2). 8.The privacy display module of claim 7, wherein, The polarizing degree of the first polarizer (10), the second polarizer (11), the third polarizer (8) and the fourth polarizer (7) is >99.9%. 9.The privacy display module of claim 1, wherein, The upper side of the cover plate (1) is coated with an anti-glare coating and an anti-reflection layer.

10. A display device for a vehicle, characterized by comprising: It comprises the privacy display module as claimed in any one of claims 1-9. It comprises the privacy display module as claimed in any one of claims 1-9.

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