METHOD FOR MANUFACTURING A VEHICLE INDICATOR DEVICE, VEHICLE INDICATOR FIELD AND VEHICLE INDICATOR DEVICE

Abstract

[Problem] The object of the invention is to provide a vehicle display field that does not impair the strength and aesthetic appearance of the vehicle display field, does not generate any background noise in the vehicle display field, and reduces light emission, as well as a vehicle display device with such a vehicle display field. [Solution] In the groove forming process, grooves 23 between display areas AR11 ~ AR17 and the ends 21E of the transparent resin mold body 21 and / or between the adjacent display areas AR11 ~ AR17 along the predetermined shape are formed by machining with computer-controlled numerical control such that a thickness remains within a specific range.In the process of forming a filled body, the grooves 23 are filled with colored resin filling, which blocks the light passing through the transparent resin mold body, and a body 22 filled with colored resin filling is formed in the grooves 23.

Description

Technical field

[0001] The invention relates to a method for manufacturing a motor vehicle display device, a motor vehicle display field and a motor vehicle display device. General state of the art

[0002] A display device is provided in the instrument panel of a motor vehicle. The instrument panel display device includes, for example, a display for a navigation system and a symbol for a heating control panel, as described in patent document 1 (JP 7125713 B2). State-of-the-art documents, patent documents

[0003] Patent document 1: JP 7125713 B2 Brief description of the invention; Problem of the present invention

[0004] In a vehicle display unit, light propagates through the transparent resin housing of the vehicle display panel and the heating control panel, and can, for example, escape from the ends of the transparent resin housing. If light escapes from the ends of the vehicle display panel or the heating control panel inside the vehicle at night, this escaping light can be very noticeable.

[0005] To reduce light leakage at the ends of such a transparent resin molded body, it is conceivable to incorporate a light-shielding measure at the point of exit. However, if the shape of the transparent resin molded body is made complex to accommodate such a light-shielding measure, the surface of the transparent resin molded body of the automotive instrument cluster may develop sink marks, etc., after the molding process, which can impair its aesthetic appearance. If the aesthetic appearance is compromised due to a defect on the surface of the transparent resin molded body, this can lead to poor quality of the automotive instrument cluster, as the instrument cluster is located in front of the driver and passengers.

[0006] Furthermore, there is a high probability that the driver or passengers will collide with the instrument panel in a traffic accident, etc., and it is expected that a vehicle display panel located in the instrument panel will help to protect the driver and passengers in an emergency such as an accident. In addition, it is necessary for the vehicle display panel to suppress the reduction of strength and the generation of noise caused by rubbing parts.

[0007] The object of the invention is to provide a motor vehicle display field that does not impair the strength and aesthetic appearance of the motor vehicle display field, does not generate any disturbing noise in the motor vehicle display field and reduces light emission, as well as a motor vehicle display device with such a motor vehicle display field. Means of solving the task

[0008] Several aspects are described below as means of solving the task. These aspects can be combined as needed.

[0009] The method for manufacturing a motor vehicle display device according to a first aspect of the invention comprises an injection molding process, a groove forming process, and a process for forming a filled body. In the injection molding process, a translucent transparent resin body is injection molded with a predetermined shape. In the groove forming process, grooves between display areas, which are indicated by light passing from the back to the front of the transparent resin body, and the ends of the transparent resin body and / or between the adjacent display areas along the predetermined shape are formed by machining with computer-controlled numerical control, such that a thickness remains within a specific range.In the process of forming a filled body, the grooves are filled with colored resin filling, which blocks the light passing through the transparent resin mold body, and a body filled with colored resin filling is formed in the grooves.

[0010] The method for manufacturing a motor vehicle display device according to the first aspect includes the groove forming process and the process for forming a filled body, so that the grooves do not need to be formed by injection molding and thus sink marks and warping during groove formation can be avoided. Since the grooves are filled with the colored resin filler and the body filled with colored resin filler is formed within the grooves, the transparent resin mold body is integrated into the body filled with colored resin filler at the circumference of the grooves. Thus, the transparent resin mold body is reinforced by the body filled with colored resin filler, so that the reduction in the strength of the motor vehicle display field caused by the formation of the grooves is suppressed and the generation of noise in the motor vehicle display field due to vehicle vibrations can be prevented.The penetration of light into the end of the transparent resin mold body and / or into the adjacent display areas can be reduced by the body filled with colored resin in the grooves.

[0011] The method for manufacturing a motor vehicle display device according to a second aspect of the invention is provided in the method for manufacturing a motor vehicle display device according to the first aspect such that the defined area is 0.5 mm or more and 2 mm or less and is equal to or less than half the thickness of the transparent resin mold body on both sides of the grooves.

[0012] According to the method for manufacturing a motor vehicle display device of the second aspect, it is possible to adjust the reduction of light emission and the suppression of a reduction in the strength of the motor vehicle display field accordingly.

[0013] The method for manufacturing a motor vehicle display device according to a third aspect of the invention includes, in the method for manufacturing a motor vehicle display device according to the first aspect or the second aspect, a thinning process in which the display areas of the transparent resin mold body are thinned by machining with computer-controlled numerical control along the predetermined shape.

[0014] According to the third aspect of the method for manufacturing a motor vehicle display device, the forming difficulty caused by the resin's flowability, as encountered in injection molding, is eliminated, and the forming process is facilitated. The difficulties in forming due to the resin's flowability are eliminated, and the occurrence of sink marks or distortions in the display area can be prevented by thinning the display area through machining using computer-controlled numerical control.

[0015] The method for manufacturing a motor vehicle display device according to a fourth aspect of the invention includes, in the method for manufacturing a motor vehicle display device according to the third aspect, a bonding process in which a display is bonded to the sections thinned by machining in the thinning process by means of an optically transparent resin or an optically transparent adhesive.

[0016] According to the method for manufacturing a motor vehicle display device of the fourth aspect, the visibility of the display can be improved by the optically transparent resin or the optically transparent adhesive that is bonded to the sections of the transparent resin mold body thinned by machining.

[0017] The method for manufacturing a motor vehicle display device according to a fifth aspect of the invention is provided such that, in the method for manufacturing a motor vehicle display device according to the fourth aspect, the refractive index of the optically transparent resin or the optically transparent adhesive is equal to or greater than the refractive index of the transparent resin mold body minus 0.1 and equal to or less than the refractive index of the transparent resin mold body plus 0.1.

[0018] According to a method for manufacturing a motor vehicle display device of the fifth aspect, the visibility of the display can be improved compared to the case where the refractive index is set outside this range by setting the refractive index of the optically transparent resin or the optically transparent adhesive to a value that is equal to or greater than the refractive index of the transparent resin mold body 21 minus 0.1 and equal to or less than the refractive index of the transparent resin mold body 21 plus 0.1.

[0019] A motor vehicle display panel according to a sixth aspect of the invention comprises a translucent, transparent resin body with a predetermined shape and grooves formed by machining along the predetermined shape, and a colored resin-filled body consisting of a colored resin that is filled into the grooves and blocks light passing through the transparent resin body. The transparent resin body has display areas in which the display is achieved by means of light passing from the back to the front. The grooves are arranged between the display areas and the ends of the transparent resin body and / or between adjacent display areas. The thickness of the transparent resin body at the grooves is 0.5 mm or more and 2 mm or less, and half or less of the thickness of the transparent resin body on both sides of the grooves.

[0020] In the sixth aspect of the vehicle display panel, sink marks and distortions during groove formation can be prevented because the grooves are formed by machining. Since the grooves are filled with colored resin and the resin-filled body is formed within the grooves, the transparent resin mold body is integrated into the resin-filled body around the circumference of the grooves. This reinforces the transparent resin mold body, thus suppressing the reduction in strength of the vehicle display panel caused by the groove formation and preventing the generation of noise in the vehicle display panel due to vehicle vibrations.The penetration of light into the end of the transparent resin mold body and / or into the adjacent display areas can be reduced by the colored resin-filled body in the grooves. Furthermore, it is possible to adjust the reduction of light emission and the suppression of any reduction in the strength of the automotive display panel accordingly.

[0021] The motor vehicle display field according to a seventh aspect of the invention is a motor vehicle display field according to the sixth aspect, in which the transparent resin mold body is designed such that the display areas are thinner than the perimeter of the display areas due to machining.

[0022] According to the seventh aspect of the motor vehicle display field, it is possible to prevent the occurrence of sink marks and distortions in the display areas and to give the display areas a good aesthetic appearance.

[0023] The motor vehicle display device according to an eighth aspect of the invention comprises a translucent transparent resin body with a predetermined shape and grooves formed by machining along the predetermined shape, a body filled with colored resin consisting of a colored resin that is filled into the grooves and blocks light passing through the transparent resin body, and a light source arranged on the rear side of the transparent resin body that emits the light passing through the transparent resin body. The transparent resin body has display areas in which the display is made by means of light passing from the rear to the front. The grooves are arranged between the display areas and the ends of the transparent resin body and / or between adjacent display areas.The thickness of the transparent resin mold body at the grooves is 0.5 mm or more and 2 mm or less, and half or less of the thickness of the transparent resin mold body on both sides of the grooves.

[0024] In the eighth aspect of the automotive display device, sink marks and distortions during groove formation can be prevented because the grooves are formed by machining. Since the grooves are filled with colored resin and the resin-filled body is formed within the grooves, the transparent resin mold body is integrated into the resin-filled body around the circumference of the grooves. This reinforces the transparent resin mold body, thus suppressing the reduction in strength of the automotive display device caused by groove formation and preventing the generation of noise in the automotive display device due to vehicle vibrations.The penetration of light into the end of the transparent resin mold body and / or into the adjacent display areas can be reduced by the colored resin filling in the grooves. Furthermore, it is possible to adjust the reduction of light emission and the suppression of any reduction in the strength of the automotive display device accordingly.

[0025] The motor vehicle display device according to a ninth aspect of the invention is a motor vehicle display device according to the eighth aspect, in which the transparent resin molded body display areas are designed such that the display areas are thinner than the perimeter of the display areas due to machining. An optically transparent resin or an optically transparent adhesive is provided for bonding a display, which is shown with the light source, to the thin sections of the display areas.

[0026] According to the ninth aspect of the automotive display device, it is possible to prevent the occurrence of sink marks and distortions in the display areas and to give the display areas a good aesthetic appearance. Furthermore, the visibility of the display can be improved by the optically transparent resin or adhesive that is bonded to the sections of the transparent resin molded body thinned by machining. Effect of the invention

[0027] The method for manufacturing a motor vehicle display device according to the invention enables the provision of a motor vehicle display device that does not impair the strength and aesthetic appearance of the vehicle display field, prevents the generation of interference noise in the vehicle display field, and reduces light emission from the vehicle display field. The vehicle display field or motor vehicle display device according to the invention makes it possible to simultaneously prevent the deterioration of strength and aesthetic appearance, the generation of interference noise, and the reduction of light emission. Brief description of the characters Fig. Figure 1 shows a schematic front view of an instrument panel to illustrate the arrangement of a motor vehicle display device in the instrument panel. Fig. Figure 2 shows a perspective view illustrating an example of the construction of a motor vehicle display panel according to a first embodiment. Fig. Figure 3 shows a cross-sectional view of a motor vehicle display panel along Line II in Fig. 2. Fig. Figure 4 shows a cross-sectional view of a motor vehicle display panel along line II-II in Fig. 2. Fig. Figure 5 shows a flowchart illustrating an example of a manufacturing process for a motor vehicle display device according to the first embodiment. Fig. Figure 6 shows a cross-sectional view illustrating an example of the construction of a motor vehicle display panel according to a second embodiment. Fig. Figure 7 shows a cross-sectional view illustrating an example of the construction of a motor vehicle display panel according to a third embodiment. Fig. Figure 8 shows a flowchart illustrating an example of a manufacturing process for a motor vehicle display device according to the third embodiment. Fig. Figure 9 shows a cross-sectional view illustrating an example of the construction of a motor vehicle display panel according to a fourth embodiment. Fig. Figure 10 shows a cross-sectional view illustrating an example of the construction of a motor vehicle display panel according to a fifth embodiment. Embodiments of the invention<Erste Ausführungsform> (1) Design of a motor vehicle display device

[0028] Fig. Figure 1 shows an instrument panel 10 of a motor vehicle. The instrument panel 10 is equipped with displays such as a speedometer 11. A dashboard 12 is also part of the instrument panel 10. A steering wheel 90 is located in front of the instrument panel 10.

[0029] A vehicle display panel 20 is located in the center of the instrument panel 10. The vehicle display panel 20 is, for example, a component of a navigation system. Below the vehicle display panel 20 is a heating control panel 30. When controlling the cooling system, the term "heating control panel" can be replaced by "air conditioning control panel." The heating control panel 30 displays, for example, a temperature setting symbol, a heater symbol, a mode switching symbol, and an on / off symbol. The temperature setting symbol is, for example, a symbol that displays a number indicating the temperature or an arrow. The heater symbol is a symbol represented by a wavy line. The heater symbol indicates, for example, that the heater is switched on. The mode switching symbol indicates the change between the heater's modes (heating, cooling, fan).The on / off symbol indicates whether the heating is on or off. (1-1) Motor vehicle display field

[0030] An example of a motor vehicle display field 20 is in Fig. 2 shown. The vehicle display field 20 shows, as in Fig. 3 and Fig. Figure 4 shows a transparent resin mold body 21 and a body 22 filled with colored resin. Fig. Figure 3 shows a cross-sectional shape along line II in Fig. 2, and Fig. Figure 4 shows a cross-sectional shape along line II-II in Fig. 2.

[0031] In the center of the vehicle display field 20, viewed from the front, a trapezoidal, transparent first display area AR11, which is formed by the transparent resin mold body 21, is arranged, with a second display area AR12 and a third display area AR13, each approximately rectangular, arranged below the first display area AR11. An opening 25 is arranged between the second display area AR12 and the third display area AR13, in which, for example, a rotary knob is located. When viewed from the front, an opaque light-shielding area AR2 is arranged around the display areas AR11, AR12, and AR13.

[0032] The transparent resin mold body 21 has a predefined shape. This predefined shape is a rectangular shape with an arcuate cross-section when viewed from the front and an opening 25. The transparent resin mold body 21 has a groove 23 formed by machining. The grooves 23 follow the predefined shape of the transparent resin mold body 21. In other words, the grooves 23 are formed by machining. Fig. 3 and Fig. The four grooves 23 shown are curved in an arc along the surface of the transparent resin mold body 21, which is also curved in an arc. Here, the grooves 23 follow a simple arc shape, but the predefined shape that the grooves 23 follow can be a complex three-dimensional shape that combines more curves and surfaces than a simple basic shape, such as a flat plate and an arc shape. The transparent resin mold body 21 is made of a transparent resin and allows light to pass through it. The transparent resin mold body 21 can also be semi-transparent.

[0033] The colored resin-filled body 22 consists of a colored resin that is filled into the grooves 23. Such colored resin-filled bodies 22 can block the light passing through the transparent resin mold body 21. The colored resin-filled body 22 is arranged along the predetermined shape of the transparent resin mold body 21, so that the emission of light from the ends 21E of the transparent resin mold body 21 can be reduced.

[0034] The body 22, filled with colored resin, is filled into the grooves 23 and is thus firmly bonded to the transparent resin mold body 21. In other words, the body 22 filled with colored resin is integrated into the transparent resin mold body 21. Because the body 22 filled with colored resin and the transparent resin mold body 21 are integrated, no displacement occurs between the body 22 filled with colored resin and the transparent resin mold body 21, even if the transparent resin mold body 21 is subjected to stress, for example, from vehicle vibrations, thus preventing the generation of noise caused by vehicle vibrations.Since the stress is distributed over the colored resin-filled body 22 and the transparent resin mold body 21, it does not concentrate on the area of ​​the transparent resin mold body 21 thinned by the grooves 23, so that even during the formation of the grooves 23, an impairment of the strength and the aesthetic appearance of the transparent resin mold body 21 of the motor vehicle display panel 20 is prevented.

[0035] The display areas AR11, AR12 and AR13 of the transparent resin body 21 are areas where the display is achieved with light penetrating from the rear side BS to the front side FS. The grooves 23 are arranged between the display areas AR11, AR12, AR13 and the ends 21E.

[0036] The thickness TH1 of the transparent resin mold body 21 at the grooves 23 is 0.5 mm or more and 2 mm or less, and is set to half or less of the thickness TH2 of the transparent resin mold body 21 on both sides of the grooves 23. The width of the grooves 23 is, for example, 1 mm or more and 5 mm or less.

[0037] The in Fig. The vehicle display panel 20 shown in Figures 2 to 4 has a partial light-shielding film 26. The partial light-shielding film 26 is transparent in the sections corresponding to the display areas AR11, AR12, and AR13, and is colored, for example, black in the section corresponding to a light-shielding area AR1. The light-shielding area AR1 can be a color other than black, as long as it shields light directed from the rear side BS to the front side FS of the transparent resin body 21 so that it does not radiate from the vehicle display panel 20. The light-shielding area AR1 is formed, for example, by printing the entire surface of the light-shielding area AR1 with ink. The partial light-shielding film 26 is, for example, a decorative film.The partial light shielding film 26 is applied to the front side FS of the transparent resin mold body 21, for example by overmolding during injection molding of the transparent resin mold body 21. (1-2) Motor vehicle display device

[0038] The vehicle display device 1 comprises a vehicle display panel 20, a liquid crystal display 2, and a light source 3. The liquid crystal display 2 and the light source 3 are arranged on the back side BS of the transparent resin body 21. The light source 3 provides backlighting for the liquid crystal display 2. The arrangement on the back side BS means that direct contact with the back side BS of the transparent resin body 21 is not necessary. Of course, they can also be arranged to come into direct contact with the back side BS of the transparent resin body 21.

[0039] The light emitted by the light source 3 penetrates the liquid crystal display 2 and the transparent resin body 21 and is emitted outwards from the display areas AR11, AR12, and AR13 of the vehicle display device 1. However, the portion of the light emitted by the light source 3 that passes through the transparent resin body 21 and is directed towards the ends 21E of the transparent resin body 21 is blocked by the colored resin-filled body 22 and is therefore reduced compared to the case where the colored resin-filled body 22 is not present.

[0040] Instead of the liquid crystal display 2 and the light source 3, a self-illuminating display such as an organic electroluminescent display (OLED) or a plasma display can be used. When using an organic electroluminescent display or a plasma display, it serves as its own light source and is self-illuminating, so no separate light source is required. (2) Method for manufacturing a motor vehicle display device

[0041] The manufacture of the above-described motor vehicle display device 1 is described with reference to the flowchart in Fig. 5 described.

[0042] In the injection molding process (step S1), the transparent resin mold body 21 is injection molded. The transparent resin mold body 21 produced in the injection molding process does not yet have a groove 23 formed. This means that the predetermined shape of the transparent resin mold body 21 corresponds to that specified in the Fig. The form shown in figures 2 to 4, with the exception of groove 23, is identical. The transparent resin mold body 21 is formed from a transparent resin and allows light to pass through. Examples of transparent resins are polycarbonate resin (PC) and polymethyl methacrylate resin (PMMA).

[0043] It is possible that during the injection molding process, the partial light shielding film 26 is placed in a mold and simultaneously applied to the front surface FS of the transparent resin mold body 21. Alternatively, the partial light shielding film 26 can be bonded to the front surface FS of the transparent resin mold body 21 after injection molding.

[0044] In the groove forming process (step S2), the grooves 23 are formed by machining with computer-controlled numerical control (CNC) along a predetermined shape of the transparent resin mold body 21 such that a thickness TH1 remains in a specific area. The use of computer-controlled numerical control makes it possible to form the grooves 23 according to the three-dimensional shape of the transparent resin mold body 21. In the Fig. 3 and Fig. In the transparent resin mold body 21 shown in Figure 4, the grooves 23 are formed along an arc-shaped curvature. For example, the thickness TH1 of the transparent resin mold body 21 at the part where the grooves 23 are formed is a constant thickness of, say, 0.5 mm. Alternatively, the grooves 23 can be formed such that the thickness TH1 of the transparent resin mold body 21 at the part where the groove 23 is formed varies in the range of 0.5 mm to 1 mm, for example, if the thickness TH2 of the transparent resin mold body 21 around the grooves 23 is 3 mm. If the transparent resin mold body 21 is used in the automotive display device 1, the thickness TH2 of the transparent resin mold body 21 is, for example, 2 mm to 4 mm.

[0045] It is preferred that the thickness TH1 of the transparent resin molded body 21 at the part where the grooves 23 are formed is 0.5 mm or more and 2 mm or less, and is set to half or less than the thickness TH2 of the transparent resin molded body on both sides of the grooves 23. If the thickness TH1 of the transparent resin molded body 21 at the part where the grooves 23 are formed is large, the amount of light exiting the ends 21E, etc., increases. If the thickness TH1 of the transparent resin molded body 21 at the part where the grooves 23 are formed is small, the stiffness of the vehicle display panel 20 decreases. The aforementioned preferred range for thickness TH1 was determined taking into account the balance between these two factors.

[0046] If the grooves 23 are produced by injection molding, sink marks and distortions may occur in the transparent resin mold body 21, but if the groove 23 is produced by machining with computer-controlled numerical control, sink marks and / or distortions can be avoided.

[0047] The grooves 23 are formed at least between the display areas AR11, AR12, AR13 and the ends 21E of the transparent resin molded body 21, as well as between the respective adjacent display areas AR11, AR12, AR13. In the first embodiment, the grooves 23 are formed, for example, around the entire circumference of the display area AR11. If, for example, measures are also taken when the light exits from the top of the vehicle display field 20 to prevent the exiting light from being emitted into the vehicle interior by other sealing components, etc., the formation of the grooves on the top of the display area AR11 can be omitted.

[0048] In the filler formation process (step S3), the colored resin-filled body 22 is formed by filling the grooves 23 with colored resin. The colored resin filler serves to block the light passing through the transparent resin body 21 from the display areas AR11, AR12, and AR13 to the ends 21E and / or to the adjacent display areas AR11, AR12, and AR13. The light directed to the adjacent display areas is the light directed from display area AR11 to display areas AR12 and AR13, the light directed from display area AR12 to display areas AR11 and AR13, and the light directed from display area AR13 to display areas AR11 and AR12.

[0049] Colored resin is a resin that has been colored by mixing in a colorant. Colorants include, for example, pigments and dyes. The types of resins used to produce colored resin include thermoplastic resins, thermosetting resins, and UV-curing resins. Polypropylene resin is an example of a thermoplastic resin. Urethane resin is an example of a thermosetting resin. Acrylic resins are examples of UV-curable resins. As a material for colored resins, thermoplastic resins offer excellent processability due to their softening properties when heated. Thermoplastic resins facilitate the uniform incorporation of pigments and ensure consistent color distribution. Furthermore, thermoplastic resins are suitable for recycling because they can be softened and reshaped by heat.

[0050] In the assembly process (step S4), the vehicle display device 1 is assembled. During this process, the liquid crystal display 2 and the light source 3 are combined to form the vehicle display panel 20. Alternatively, other displays, such as an organic EL display or a plasma display, and light sources can be used instead of the liquid crystal display 2 and the light source 3. <Zweite Ausführungsform> (3) Design and manufacture of the motor vehicle display device

[0051] In the first embodiment, a case was described in which various information and video images are displayed using the liquid crystal display 2, an organic EL display, or a plasma display. However, in the automotive display device 1, some displays operate by switching between illumination and non-illumination, such as the symbols on the heater control panel 30.

[0052] In Fig. 6 The partial light-shielding film 26 for the display areas AR14, AR15, AR16, and AR17 of the motor vehicle display device 1, according to the second embodiment, has a printed section through which light passes only through symbol patterns. Four LEDs 3L are arranged on the reverse side BS as light sources 3, corresponding to the display areas AR14, AR15, AR16, and AR17. An on / off symbol is arranged in display area AR14, and when the LED 3L corresponding to display area AR14 illuminates, the on / off symbol also illuminates. It is possible to indicate to the driver that the heater is switched on by illuminating the on / off symbol.

[0053] In the vehicle display field 20 of the vehicle display device 1 according to the second embodiment, a body 22 filled with colored resin (grooves 23) is arranged between the adjacent display areas AR14, AR15, AR16, and AR17, similar to the first embodiment. Furthermore, the bodies 22 filled with colored resin (grooves 23) are arranged between the display areas AR14 and AR17 and the ends 21E of the transparent resin mold body 21. Light emission from the illumination of the on / off symbol into the display area AR15 is suppressed, even when, for example, the on / off symbol is illuminated, because the body 22 filled with colored resin is arranged between the display area AR14 of the on / off symbol and the adjacent display area AR15.

[0054] The motor vehicle display device 1 of the second embodiment can be manufactured using the same manufacturing process as the motor vehicle display device 1 of the first embodiment, so that explanations of the manufacturing process for the motor vehicle display device 1 of the second embodiment are omitted here. <Dritte Ausführungsform> (4) Design and manufacture of the motor vehicle display device

[0055] In the motor vehicle display device 1 according to the first embodiment, the shape of the transparent resin mold body 21 at the location where the liquid crystal display 2 and the light source 3 are arranged remains the same as the shape produced by injection molding. An example of the construction of the motor vehicle display device 1 according to the third embodiment is shown in Fig. 7 shown. As in Fig. As shown in Figure 7, in the third embodiment of the motor vehicle display device 1, the transparent resin mold body 21 of the display area AR11, which corresponds to the location where the liquid crystal display 2 and the light source 3 are arranged, is thinner than the circumference RN1 of the display area AR11 due to machining by means of computer-controlled numerical control. That is, the following equation applies: (Thickness TH3 of the transparent resin mold body 21 at the thin section P1, which corresponds to the display area AR11) < (Thickness TH4 of the perimeter RN1 of the display area AR11).

[0056] When the transparent resin mold body 21 is used in the motor vehicle display device 1, the thickness TH4 of the circumference RN1 of the display area AR11 is, for example, 2 mm to 4 mm. The difference (TH4-TH3) between the thickness TH3 of the transparent resin mold body 21 at the thinned section P1 and the thickness TH4 of the circumference RN1 of the display area AR11 is, for example, 0.5 mm to 2 mm.

[0057] Furthermore, in Fig. 7 The wall between the perimeter RN1 of the display area AR11 and the thinned section P1 is shown inclined; however, this wall can also be formed perpendicular to the surface of the thinned section P1 or to the surface of the perimeter RN1. With a vertical wall, the liquid OCR can be conveniently stored, and, for example, bonding it to the liquid crystal display 2 becomes easier.

[0058] A manufacturing process for the motor vehicle display device 1 according to the third embodiment is described in Fig. 8 shown. The manufacturing process of the motor vehicle display device 1 according to the third embodiment differs from the manufacturing process of the one shown in Fig. 5 first embodiment shown in that the manufacturing process includes a thinning process (step S2').

[0059] In the thinning process, analogous to the groove forming process (step S2), the display area AR11 of the transparent resin mold body 21 is thinned along the predetermined shape of the transparent resin mold body 21 by machining using computer-controlled numerical control (CNC). Here, the case described is in which the thinning process (step S2') is carried out after the groove forming process (step S2); however, the order of these processes can be reversed.

[0060] To thin a large area like the display area AR11, the transparent resin mold body 21 is initially thin, for example, 3 mm, making molding difficult due to the resin's flowability. If the display area AR11 is thinned by injection molding, sink marks and warping can occur in the transparent resin mold body 21. However, if the display area AR11 is thinned by machining using computer-controlled numerical control, the molding difficulty due to the resin's flowability is eliminated, and the occurrence of sink marks or warping can be prevented. <Vierte Ausführungsform> (5) Design and manufacture of the motor vehicle display device

[0061] In the third embodiment of the automotive display device 1, the case was described in which the liquid crystal display 2 and the light source 3 are arranged on the back side BS of the thinned transparent resin mold body 21. In the third embodiment, the thinned transparent resin mold body 21 has cut marks on its back side BS. In the automotive display device 1 according to the third embodiment, the cut section is polished to remove the cut marks. Alternatively, in the automotive display device 1 according to the third embodiment, a coating agent is applied to the cut section to remove the cut marks. However, in the automotive display device 1 according to the third embodiment, there is an air gap between the liquid crystal display 2 and the light source 3, as well as between the back side BS of the transparent resin mold body 21.

[0062] In the fourth embodiment of the motor vehicle display device 1, an optically transparent resin 41 (optical clear resin) or an optically transparent adhesive 42 (optical clear adhesive) is arranged between the liquid crystal display 2 and the section P1, which has been made thinner than the surrounding area of ​​the display area AR11 by machining (see Fig. 9) The optically transparent resin 41 or the optically transparent adhesive 42 introduced into the cut marks penetrates the irregularities of the cut marks and prevents diffuse reflections that occur in the cut marks. Comparing the optically transparent resin 41 and the optically transparent adhesive 42, the optically transparent resin 41 exhibits higher flowability and fills cut marks better, making it more suitable for use in the cut sections of the transparent resin mold body 21. However, the optically transparent adhesive 42 is an adhesive processed into a tape and is therefore ideally suited for processing.Since the liquid crystal display 2 and the optically transparent resin 41 or the optically transparent adhesive 42 are in close contact with each other, no reflection occurs at the interface between air and resin, and a reduction in the amount of light directed from the liquid crystal display 2 to the front FS of the vehicle display panel 20 is suppressed. This prevents the visibility from being impaired by cut marks.

[0063] To avoid impairing visibility, it is advantageous if the refractive index of the optically transparent resin 41 or the optically transparent adhesive 42 is within plus or minus 0.1 of the refractive index of the transparent resin body 21 (refractive index of the transparent resin body 21 -0.1 ≤ refractive index of the optically transparent resin 41 or the optically transparent adhesive 42 ≤ refractive index of the transparent resin body 21 +0.1). For example, if the transparent resin body 21 is made of polycarbonate resin (refractive index 1.58), it is preferred to use the optically transparent resin 41 or the optically transparent adhesive 42 with a refractive index of 1.48 to 1.68 to bond the transparent resin body 21 and the liquid crystal display 2 together.For example, if the transparent resin body 21 is made of polymethyl methacrylate resin (refractive index 1.49), it is preferred to use the optically transparent resin 41 or an optically transparent adhesive 42 with a refractive index of 1.39 to 1.59 to bond the transparent resin body 21 and the liquid crystal display 2 together.

[0064] The optically transparent resin 41 or the optically transparent adhesive 42 is used in the assembly process (step S4) in Fig. 8. To bond the liquid crystal display 2 and the thin section P1 of the optically transparent resin 41 together. The bonding process is the process in which the liquid crystal display 2 is bonded to the thinned section P1, which was made thinner by machining during the thinning process, using the optically transparent resin 41 or the optically transparent adhesive 42. After assembly, the optically transparent resin 41 or the optically transparent adhesive 42 is in close contact with the liquid crystal display 2 and the optically transparent resin 41.

[0065] Even if an organic EL display or a plasma display is used instead of the liquid crystal display 2, the organic EL display or the plasma display can be bonded to the transparent resin mold body 21 using the optically transparent resin 41 or the optically transparent adhesive 42. <Fünfte Ausführungsform>(6) Design and manufacture of the motor vehicle display device

[0066] An example of the construction of the motor vehicle display device 1 according to the fifth embodiment is shown in Fig. 10 shown. The in Fig. The motor vehicle display device 1 shown in Figure 10 differs from the motor vehicle display device 1 according to the fourth embodiment in Figure 10. Fig. 9 by providing a projection 50 on the back side BS of the transparent resin body 21 and adjusting the light transmittance such that the projection 50 is difficult to see from outside the vehicle display field 20. The structure provided on the back side BS of the transparent resin body 21 may be something other than the projection 50, for example, a rib or a clip seat. To make the structure provided on the back side BS of the transparent resin body 21 less visible, at least one pigment or colorant is added to the transparent resin body 21. A preferred range for the total light transmittance to make the structure provided on the back side BS of the transparent resin body 21 less visible is between 20% or more and 70% or less. The total light transmittance is measured according to JIS K7375.

[0067] The motor vehicle display device 1 according to the fifth embodiment can be manufactured using the same manufacturing process as the fourth embodiment of the motor vehicle display device 1, with the exception that the resin used for the transparent resin mold body 21 and the mold are different, so that the explanation of the method of manufacturing the motor vehicle display device 1 according to the fifth embodiment is omitted here. (7) Variation example

[0068] In the embodiments described above, the focus was on the case in which the vehicle display device 1 has the sole function of displaying information. However, the vehicle display device 1 can be equipped with a touch sensor and simultaneously function as both a display and an input device. The touch sensor is located at a position where input can be made by touching the vehicle display field 20. For example, the touch sensor is located on the front FS or the back BS of the transparent resin mold body 21. If the touch sensor is located on the front FS of the transparent resin mold body 21, it is situated, for example, between the transparent resin mold body 21 and the partial light shielding film 26.If the touch sensor is located on the back BS of the transparent resin body 21, the touch sensor is located, for example, between the transparent resin body 21 and the liquid crystal display 2. (8) Features (8-1)

[0069] The method for manufacturing the motor vehicle display device 1 according to the first to fifth embodiments described above comprises a groove forming process in which the grooves 23 between the display areas AR11 to AR17 and the ends 21E of the transparent resin mold body 21 and / or between adjacent display areas AR11 to AR17 are formed by machining along a predetermined shape using computer-controlled numerical control, such that a thickness remains within a specific range. The process also includes a process for forming a filled body in which the colored resin filling is injected into the grooves 23, and the body 22 filled with colored resin is formed within the grooves 23. This eliminates the need for injection molding to produce the grooves 23, thus avoiding sink marks and distortions that can occur during the production of the grooves 23.Since the colored resin filling is poured into the grooves 23 and the body 22 filled with colored resin is formed in the grooves 23, the transparent resin body 21 is connected to the body 22 filled with colored resin around the grooves 23, and the transparent resin body 21 is reinforced by the body 22 filled with colored resin. This prevents the reduction in strength and aesthetic appearance of the vehicle display panel 20 caused by the formation of the grooves 23 and also prevents the generation of noise due to vehicle vibrations. The penetration of light into the ends 21E of the transparent resin body 21 and / or into the adjacent display areas AR11 to AR17 is reduced by the body 22 filled with colored resin in the grooves 23. (8-2)

[0070] It is possible to adjust the reduction of light leakage and the suppression of strength reduction in automotive display field 20 accordingly by adjusting the thickness TH1 (see Fig. 4) of the transparent resin mold body 21, which remains after the formation of the grooves 23, to a value between 0.5 mm or more and 2 mm or less and to equal to or less than half the thickness TH2 (see Fig. 4) of the transparent resin mold body 21 is fixed on both sides of the grooves 23. (8-3)

[0071] As explained in the third and fourth embodiments, the difficulty of shaping due to the resin's flowability, as occurs in injection molding, is eliminated and shaping is facilitated when the display area AR11 of the transparent resin mold body 21 is thinned by machining with computer-controlled numerical control along a predetermined shape. The difficulties of shaping due to the resin's flowability are eliminated, and the occurrence of sink marks and / or distortions in the display area AR11 can be prevented by thinning the display area AR11 by machining with computer-controlled numerical control. (8-4)

[0072] As explained in the fourth embodiment, the visibility of the display can be improved by, for example, bonding the liquid crystal display 2, the organic EL display or the plasma display to the section P1 of the transparent resin body 21 thinned by machining using the optically transparent resin 41 or the optically transparent adhesive 42. (8-5)

[0073] It is preferred that the refractive index of the aforementioned optically transparent resin 41 or the optically transparent adhesive 42 be set to a value that is equal to or greater than the refractive index of the transparent resin body 21 minus 0.1 and equal to or less than the refractive index of the transparent resin body 21 plus 0.1. By setting the refractive index of the optically transparent resin 41 or the optically transparent adhesive 42 within such a range, it is possible to improve the visibility of the display.

[0074] The first to fifth embodiments of the present invention have been explained above; however, the present invention is not limited to the embodiment described above and can be modified in various ways within a scope that does not deviate from the scope of the invention. In particular, the embodiments and examples of modifications listed in this description can be combined as required. Explanation of reference symbols 1 Motor vehicle display device 2 Liquid crystal display 3 light source 3L LED 20 Motor vehicle display field 21 transparent resin mold bodies 21E End 22 bodies filled with colored resin 23 Nut 41 optically transparent resin 42 optically transparent adhesive AR11-AR17 Display areas QUOTES INCLUDED IN THE DESCRIPTION

[0000] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature

[0000] JP 7125713 B2 [0002, 0003]

Claims

[1] Method for manufacturing a motor vehicle display device comprising: an injection molding process for injection molding a transparent resin body with a predetermined shape and light transmission; a groove forming process in which grooves between display areas, where a display is made by means of light passing from the back to the front of the transparent resin mold body, and an end of the transparent resin mold body and / or between adjacent display areas along the specified shape are formed by machining with a computer-controlled numerical control in such a way that a thickness remains in a certain area; and a process in which the grooves are filled with colored resin filling that blocks the light passing through the transparent resin mold body, and a body filled with colored resin filling is formed in the grooves. [2] Method for manufacturing a motor vehicle display device according to claim 1, wherein the defined area is 0.5 mm or more and 2 mm or less and is equal to or less than half the thickness of the transparent resin mold body on both sides of the grooves. [3] Method for manufacturing a motor vehicle display device according to claim 1 or 2, further comprising a thinning process in which the display areas of the transparent resin mold body are made thinner by machining with computer-controlled numerical control along the predetermined shape. [4] Method for manufacturing a motor vehicle display device according to claim 3, further comprising a bonding process in which a display is bonded to a section made thinner by machining in the thinning process by means of an optically clear resin or an optically clear adhesive. [5] Method for manufacturing a motor vehicle display device according to claim 4, wherein the refractive index of the optically transparent resin or the optically transparent adhesive is equal to or greater than the refractive index of the transparent resin mold body minus 0.1 and equal to or less than the refractive index of the transparent resin mold body plus 0.

1. [6] Having a motor vehicle display panel: a translucent transparent resin mold body with a predetermined shape and grooves formed by machining along the predetermined shape; and a colored resin filling made of a colored resin that fills the grooves and blocks light passing through the transparent resin mold body, wherein the transparent resin body has display areas in which a display is made by means of a light passing from the back to the front, wherein the grooves are arranged between the display areas and one end of the transparent resin mold body and / or between adjacent display areas, and wherein the thickness of the transparent resin mold body in the area of ​​the grooves is 0.5 mm or more and 2 mm or less, and half or less of the thickness of the transparent resin mold body on both sides of the grooves. [7] Motor vehicle display panel according to claim 6, wherein the transparent resin mold body is designed such that the display areas are thinner than the surrounding area due to machining. [8] Motor vehicle display device: a translucent transparent resin mold body with a predetermined shape and grooves formed by machining along the predetermined shape; a colored resin filling made of a colored resin that fills the grooves and blocks light passing through the transparent resin mold body; and a light source located on the back side of the transparent resin mold body that emits light which passes through the transparent resin mold body, wherein the transparent resin molded body has display areas in which a display is made by means of the light passing from the back to the front, wherein the grooves are arranged between the display areas and one end of the transparent resin mold body and / or between adjacent display areas, and wherein the thickness of the transparent resin mold body in the area of ​​the grooves is 0.5 mm or more and 2 mm or less, and half or less of the thickness of the transparent resin mold body on both sides of the grooves. [9] Motor vehicle display device according to claim 8, wherein the transparent resin mold body is designed such that the display areas are thinner than the surrounding area due to machining and wherein an optically clear resin or an optically clear adhesive is provided with which a display shown by the light source is bonded to the thin section of the display areas.

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