Vehicle-mounted display module and vehicle-mounted display device

Abstract

The application relates to a vehicle-mounted display module, comprising a display panel and a polaroid located at the light-emitting side of the display panel, wherein the side of the polaroid far from the display panel is provided with an optical control structure, and the optical control structure comprises: a quarter-wave plate for converting linearly polarized light emitted by the polaroid into circularly polarized light; and a light-adjusting layer arranged at the light-emitting side of the quarter-wave plate and used for controlling the emission angle of the linearly polarized light. The application also relates to a vehicle-mounted display device.

Description

Technical Field

[0001] This invention relates to the field of display product manufacturing technology, and in particular to an in-vehicle display module and an in-vehicle display device. Background Technology

[0002] Currently, in-vehicle displays are developing towards larger sizes and greater personalization, which will bring consumers a brand-new visual experience. However, due to factors such as large screen size, strong and complex ambient light, scenarios where sunglasses are worn, and high safety requirements, in-vehicle displays often require the use of light control film (LCF) components. LCF controls the light emission angle of the display panel, thereby adjusting the viewing angle for the human eye. This cannot meet the requirement of "sunglass-free" (meaning that in outdoor ambient light scenarios, there will be no severe darkening at a certain angle due to wearing sunglasses, resulting in unclear vision). When people wear sunglasses, blind spots will appear at specific viewing angles due to the optical effects between the film layers, affecting driving safety. Summary of the Invention

[0003] To address the aforementioned technical problems, this invention provides an in-vehicle display module and an in-vehicle display device, resolving the issue that light-controlled films cannot fulfill the sunglass-free function.

[0004] To achieve the above objectives, the technical solution adopted in this embodiment of the invention is: an in-vehicle display module, including a display panel and a polarizer located on the light-emitting side of the display panel, wherein an optical control structure is disposed on the side of the polarizer away from the display panel, and the optical control structure includes:

[0005] A quarter-wave plate is used to convert linearly polarized light emitted from the polarizer into circularly polarized light;

[0006] A dimming layer is disposed on the light-emitting side of the quarter-wave plate and is used to control the emission angle of the linearly polarized light.

[0007] Optionally, the quarter-wave plate is a substrate layer, and the dimming layer is formed on the light-emitting surface of the substrate layer.

[0008] Optionally, the dimming layer includes a grating structure, the grating structure including multiple grating stripes extending along a first direction, the multiple grating stripes being spaced apart along a second direction perpendicular to the first direction.

[0009] Optionally, the substrate layer is rectangular, the angle between the extension direction of the long side of the rectangle and the first direction is 10±5 degrees, and the direction of the long side of the rectangle is perpendicular to the polarization direction of the linearly polarized light.

[0010] Optionally, the angle between the direction of the delay axis of the quarter-wave plate and the direction of the long side of the rectangle is 45 ± 10 degrees.

[0011] Optionally, the quarter-wave plate is made of polyethylene terephthalate, cyclic olefin polymers, or cellulose triacetate.

[0012] Optionally, a first protective film layer is provided on the side of the dimming layer away from the substrate layer.

[0013] Optionally, the vehicle display module further includes a cover plate located on the light-emitting side of the display panel, and the optical control structure is disposed between the polarizer and the cover plate.

[0014] Optionally, the vehicle display module further includes a cover plate located on the light-emitting side of the display panel, and the optical control structure is disposed on the side of the cover plate away from the display panel.

[0015] This invention also provides an in-vehicle display device, including the above-described in-vehicle display module.

[0016] The beneficial effect of this invention is that by setting a quarter-paddle, linearly polarized light is converted into circularly polarized light, which is matched with the sunglasses worn by the driver (which have polarization function) and applied to the vehicle display device, so that the vehicle display device has a sunglasses function. Attached Figure Description

[0017] Figure 1 Schematic diagram of the optical control structure in an embodiment of the present invention. Figure 1 ;

[0018] Figure 2 Schematic diagram of the optical control structure in an embodiment of the present invention. Figure 2 ;

[0019] Figure 3 Indication of the cutting status of the optical control structure Figure 1 ;

[0020] Figure 4 Indication of the cutting status of the optical control structure Figure 2 ;

[0021] Figure 5 Schematic diagram of optical control structure Figure 3 ;

[0022] Figure 6 A schematic diagram showing a display module with the optical control structure attached thereto;

[0023] Figure 7 A schematic diagram illustrating the fabrication process of the optical control structure;

[0024] Figure 8 This diagram illustrates the optical path of a sunglasses device with polarization capabilities and a display module with optical control structure. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of the embodiments of this disclosure clearer, the technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this disclosure. All other embodiments obtained by those skilled in the art based on the described embodiments of this disclosure without creative effort are within the scope of protection of this disclosure.

[0026] Unless otherwise defined, the technical or scientific terms used in this disclosure shall have the ordinary meaning understood by one of ordinary skill in the art to which this disclosure pertains. The terms “first,” “second,” and similar terms used in this disclosure do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, the terms “an,” “a,” or “the,” and similar terms do not indicate a quantity limitation, but rather indicate the presence of at least one. The terms “including,” “comprising,” or “containing,” and similar terms mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. The terms “connected,” “linked,” or similar terms are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. The terms “upper,” “lower,” “left,” and “right,” etc., are used only to indicate relative positional relationships, and these relative positional relationships may change accordingly when the absolute position of the described objects changes.

[0027] refer to Figures 1-5 This embodiment provides an optical control structure disposed on the light-emitting side of a display module emitting polarized light, comprising:

[0028] A quarter-wave plate 11 is used to convert the linearly polarized light into circularly polarized light;

[0029] The dimming layer 12 is disposed on the light-emitting side of the quarter-wave plate 11 and is used to control the emission angle of the linearly polarized light.

[0030] By controlling the emission angle of the linearly polarized light through the dimming layer 12, the projection of large vehicle instrument / central control displays onto the vehicle's windshield is avoided, thereby improving driving safety.

[0031] By setting the quarter-wave plate 11, the linearly polarized light emitted by the display module can be converted into circularly polarized light, which can be matched with the sunglasses (with polarization function) worn by the driver, so that the display module has a sunglasses function, solves the blind spot problem, and improves driving safety.

[0032] Figure 8 The wide arrow in the image indicates the direction of light propagation, and the arrow in the glasses indicates the polarization direction of the polarizing lens of the sunglasses 100. A polarizer 3 is provided on the light-emitting side of the display panel 2. The polarization direction of the polarizing lens of the sunglasses 100 is parallel to the polarization direction of the polarizer 3. The light emitted from the display panel 2 forms linearly polarized light after passing through the polarizer 3. The linearly polarized light forms circularly polarized light after passing through the optical control structure 1. In this way, even if the display module is rotated, for example, from a horizontal screen to a vertical screen, it will not affect the view of the driver wearing the sunglasses.

[0033] In an exemplary embodiment, the quarter-wave plate 11 is a substrate layer, and the dimming layer 12 is formed on the light-emitting surface of the substrate layer.

[0034] By adopting the above solution, there is no need to set a separate substrate layer, which can reduce the thickness of the optical control structure in the light emission direction, and thus reduce the overall thickness of the display module after the optical control structure is assembled with the display module.

[0035] In an exemplary embodiment, the dimming layer 12 includes a grating structure, the grating structure including multiple lines along a first direction (reference). Figure 1 The grating stripes 121 extend in the X direction, and multiple grating stripes 121 are spaced apart along a second direction perpendicular to the first direction.

[0036] In this application, the grating structure is manufactured by means of ink printing or other methods and is arranged in a louver-like manner. The grating structure absorbs and reflects incident light with a wide viewing angle. By designing the shape and angle of the grating, the purpose of adjusting the direction and angle of light output can be achieved.

[0037] If the optical control structure is bonded and assembled with the display module, and the angle between the extension direction of the grating stripe 121 and the extension direction of the absorption axis 20 of the polarizer in the display module is parallel, a moiré pattern will occur. To solve this problem, in an exemplary embodiment, the substrate layer is rectangular, the angle between the extension direction of the long side of the rectangle and the first direction is 10±5 degrees, and the direction of the long side of the rectangle is perpendicular to the polarization direction of the linearly polarized light, that is, the angle between the extension direction of the grating stripe 121 and the absorption axis 20 of the polarizer in the display module is 10±5 degrees.

[0038] In an exemplary embodiment, the angle between the direction of the delay axis 10 of the quarter-wave plate 11 and the direction of the long side of the rectangle is 45±10 degrees. That is, after the optical control structure is attached and assembled with the display module, the angle between the direction of the delay axis 10 of the quarter-wave plate 11 and the direction of the absorption axis 20 of the polarizer in the display module is 45±10 degrees, so that the optical control structure converts the linearly polarized light emitted by the display module into circularly polarized light. This can match the sunglasses (with polarization function) worn by the driver. Furthermore, when the display module is rotated 90 degrees, 180 degrees, and 270 degrees, the display module equipped with the optical control structure has a sunglasses function, ensuring driving safety. It can also switch between landscape and portrait modes according to different display screens, improving the user experience.

[0039] In an exemplary embodiment, the quarter-wave plate 11 is made of PET polyethylene terephthalate, COP cyclic olefin polymer or cellulose triacetate, but is not limited thereto. The quarter-wave plate 11 may also be made of other materials having the characteristic of λ / 4.

[0040] In an exemplary embodiment, a first protective film layer 14 is disposed on the side of the dimming layer 12 away from the substrate layer. When the optical control structure is bonded and assembled with the display module, the optical control structure is an optical control film layer disposed between the polarizer and the cover plate of the display module. Therefore, after the optical control structure is assembled with the display module, the first protective film layer 14 can be removed.

[0041] For example, the protective film layer may be made of a transparent material such as a polyurethane film.

[0042] In an exemplary embodiment, a second protective film layer 13 is provided on the side of the substrate layer away from the dimming layer 12.

[0043] The first protective film layer 14 and the second protective film layer 13 work together to effectively protect the quarter-wave plate 11 and the dimming layer 12. After assembly with the display module, both the first protective film layer 14 and the second protective film layer 13 can be removed to reduce the overall thickness of the display module.

[0044] This invention also provides an in-vehicle display module, including a display panel and a polarizer located on the light-emitting side of the display panel, wherein the optical control structure is disposed on the side of the polarizer away from the display panel.

[0045] refer to Figure 6The display module includes a display panel 2 and a polarizer 3 disposed on the light-emitting side of the display panel 2. The optical control structure 1 is disposed on the side of the polarizer 3 away from the display panel 2. A cover plate 4 is disposed on the side of the optical control structure 1 away from the polarizer 3. The optical control structure 1 and the cover plate 4 are connected by an optical adhesive layer. The optical control structure 1 and the polarizer 3 are connected by an optical adhesive layer 5.

[0046] The display device can be an in-vehicle display device. The angle between the display surface of the display module of the in-vehicle display device and the windshield of the vehicle can be 45±10 degrees, which is convenient for the driver to view and facilitates the control of the light output angle through the dimming layer 12, thus avoiding reflection on the windshield.

[0047] The display module as a whole can be rectangular, and the polarizer 3 is a rectangle that matches the display panel. The direction of the absorption axis 20 of the polarizer 3 is parallel to the extension direction of the long side of the rectangle, but it is not limited to this.

[0048] For example, the optical control structure is an optical film layer attached between the polarizer 3 and the cover plate 4. The angle between the extension direction of the delay axis 10 of the quarter-wave plate 11 and the extension direction of the absorption axis 20 of the polarizer in the optical control structure is 45 degrees, and the angle between the extension direction of the grating stripe 121 in the dimming layer 12 and the extension direction of the absorption axis 20 of the polarizer is 10 degrees.

[0049] It should be noted that when the display module is rectangular, the display module can be rotated to display in portrait or landscape mode. In landscape mode, the dimming layer 12 can adjust the light emission angle of the display panel in the extension direction of the short side of the rectangle, and / or in portrait mode, the dimming layer 12 can adjust the light emission angle of the display panel in the extension direction of the long side of the rectangle to avoid reflection on the windshield.

[0050] It should be noted that in normal use, the vehicle display device is located between the driver and passenger seats, and the vehicle display device is in landscape mode. At this time, the dimming layer 12 can only adjust the light emission angle of the display panel in the extension direction of the short side of the rectangle to avoid reflection on the windshield. When the display screen is rotated to display in portrait mode, it will reflect on the windshield. In order to avoid affecting driving safety due to the control of the light emission angle, the vehicle display screen needs to be moved closer to the passenger seat. At this time, the vehicle display screen is movably installed on the vehicle via a track.

[0051] It should be noted that the optical control structure 1 is not limited to being disposed between the polarizer 3 and the cover plate 4. For example, the optical control structure can also be disposed on the side of the cover plate 4 away from the display panel 2.

[0052] refer to Figure 1 , Figure 3 and Figure 7 The present invention also provides a method for fabricating an optical control structure, which is used to fabricate the above-mentioned optical control structure, and includes the following steps:

[0053] A phase delay film 101 to be cut is formed using a material with λ / 4 characteristics;

[0054] A dimming layer 12 is formed on a phase retardation film 101. The dimming layer 12 includes a grating structure, which includes multiple grating stripes 121 extending along a first direction. The multiple grating stripes 121 are spaced apart along a second direction perpendicular to the first direction, and the angle b between the first direction and the extension direction of the retardation axis 10 of the quarter-wave plate 11 is 35±5 degrees.

[0055] The phase retardation film 101 is cut to form the optical control structure of a preset shape, for example, to form a rectangle that matches the shape of the display module to be bonded, wherein the angle α between the extension direction of the cutting line 30 and the extension direction of the retardation axis 10 of the quarter-wave plate 11 is 45±10 degrees.

[0056] When the optical control structure made by the above method is assembled with the display module, the optical control structure is located between the polarizer and the cover plate of the display module, and the angle d between the extension direction of the grating stripe 121 and the extension direction of the absorption axis 20 of the polarizer is 10±5 degrees, and the angle c between the extension direction of the delay axis 10 of the quarter-wave plate 11 and the extension direction of the absorption axis 20 of the polarizer is 45±10 degrees.

[0057] By coordinating the extension direction of the grating stripes 121 with the cutting angle, the angle between the extension direction of the delay axis 10 of the quarter-wave plate 11 and the extension direction of the absorption axis 20 of the polarizer of the display module to be bonded is 45±10 degrees. This gives the display module bonded to the optical control structure a sunglass function, improving driving safety. Furthermore, the angle between the extension direction of the grating stripes 121 and the extension direction of the absorption axis 20 of the polarizer of the display module is 10±5 degrees, thereby eliminating moiré patterns.

[0058] refer to Figure 2 and Figure 4In some embodiments, the method for fabricating the optical control structure includes the following steps:

[0059] A phase delay film 101 to be cut is formed using a material with λ / 4 characteristics;

[0060] A dimming layer 12 is formed on the phase retardation film 101. The dimming layer 12 includes a grating structure. The grating structure includes multiple grating stripes 121 extending along a first direction. The multiple grating stripes 121 are spaced apart along a second direction perpendicular to the first direction. The angle b′ between the first direction and the extension direction of the retardation axis 10 of the quarter-wave plate 11 is 55±5 degrees.

[0061] The phase retardation film 101 is cut to form the optical control structure of a preset shape, for example, to form a rectangle that matches the shape of the display module to be bonded, wherein the angle α′ between the extension direction of the cutting line 30 and the extension direction of the retardation axis 10 of the quarter-wave plate 11 is 45±10 degrees.

[0062] When the extension directions of the delay axis 10 of the quarter-wave plate 11 are the same, Figure 4 The extension direction of the grating stripe 121 in the image is... Figure 3 The extension directions of the grating stripes 121 in the optical control structure and the display module are different. In order to make the angle d′ between the extension direction of the grating stripes 121 and the extension direction of the absorption axis 20 of the polarizer 10 10 degrees and the angle c′ between the extension direction of the delay axis 10 of the quarter-wave plate 11 and the extension direction of the absorption axis 20 of the polarizer 20 of the display module 45 ± 10 degrees, when the optical control structure and the display module are bonded, the extension direction of the edge formed by the cutting line 30 needs to be parallel to the extension direction of the absorption axis 20 of the polarizer 20.

[0063] refer to Figures 3-5 In some embodiments, after forming the phase delay film 101 to be cut, it needs to be stretched and wound up. Then, a resin material is coated on part of the roll as a filler layer 15. After etching, multiple openings are formed (it should be noted that the openings can also be formed by an imprinting process). A black grating (arranged at a preset angle) is made on the filler layer 15 by ink printing or other processes. Specifically, nano-metals can be used to fill the corresponding openings. Then, it is cut into sheets by a die (offset at a preset angle) to finally form an optical control film to be bonded to the corresponding display module.

[0064] In the manufacturing process of the display module, the optical control film is bonded to the OLED module with the polarizer attached, and finally the cover plate is attached to the optical control film.

[0065] It is understood that the above embodiments are merely exemplary implementations used to illustrate the principles of the present invention, and the present invention is not limited thereto. For those skilled in the art, various modifications and improvements can be made without departing from the spirit and essence of the present invention, and these modifications and improvements are also considered to be within the scope of protection of the present invention.

Claims

1. A vehicle-mounted display module, comprising a display panel and a polarizer located on the light-emitting side of the display panel, wherein an optical control structure is disposed on the side of the polarizer away from the display panel, characterized in that, The optical control structure includes: A quarter-wave plate is used to convert linearly polarized light emitted from the polarizer into circularly polarized light; A dimming layer is disposed on the light-emitting side of the quarter-wave plate and is used to control the emission angle of the linearly polarized light; The quarter-wave plate is a substrate layer, and the dimming layer is formed on the light-emitting surface of the substrate layer; The dimming layer includes a grating structure, which includes multiple grating stripes extending along a first direction, and the multiple grating stripes are spaced apart along a second direction perpendicular to the first direction; The substrate layer is rectangular, and the angle between the extension direction of the long side of the rectangle and the first direction is 10±5 degrees, and the direction of the long side of the rectangle is perpendicular to the polarization direction of the linearly polarized light.

2. The vehicle-mounted display module according to claim 1, characterized in that, The angle between the direction of the delay axis of the quarter-wave plate and the direction of the long side of the rectangle is 45 ± 10 degrees.

3. The vehicle-mounted display module according to claim 1, characterized in that, The quarter-wave plate is made of polyethylene terephthalate, cyclic olefin polymers, or cellulose triacetate.

4. The vehicle-mounted display module according to claim 1, characterized in that, A first protective film layer is provided on the side of the dimming layer away from the substrate layer.

5. The vehicle-mounted display module according to claim 1, characterized in that, It also includes a cover plate located on the light-emitting side of the display panel, and the optical control structure is disposed between the polarizer and the cover plate.

6. The vehicle-mounted display module according to claim 1, characterized in that, It also includes a cover plate located on the light-emitting side of the display panel, and the optical control structure is disposed on the side of the cover plate away from the display panel.

7. A vehicle-mounted display device, characterized in that, Includes the vehicle display module as described in any one of claims 1-6.

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