JP7276234B2 - DISPLAY DEVICE AND METHOD FOR MANUFACTURING DISPLAY DEVICE - Google Patents

Description

The disclosure in this specification relates to a display device having an organic light emitting (Electro Luminescence: EL) panel and a manufacturing method of the display device.

A vehicle display device described in Patent Document 1 has a display panel housed in a case, and a translucent protective panel is provided on the front side of the organic EL panel. A translucent member is provided between the translucent protection panel and the display panel.

JP 2018-194674 A

Unlike a liquid crystal display panel, the organic EL panel generates heat in the entire display area due to self-emission. In an environment where the temperature tends to be high, such as when mounted on a vehicle, the organic EL panel needs to be cooled by efficiently dissipating heat.

Accordingly, it is an object of the disclosure, which has been made in view of the aforementioned problems, to provide a display device and a method of manufacturing the display device that can promote heat dissipation from an organic light-emitting panel.

The present disclosure employs the following technical means to achieve the aforementioned objects.

The display device disclosed herein includes an organic light-emitting panel (21) having a display surface for displaying an image, and a thermally conductive flat plate-shaped frame provided at a distance from the rear surface opposite to the display surface. (14) is provided so as to protrude from the entire circumference of the surface of the frame facing the back surface of the organic light-emitting panel, has elasticity, and is in contact with the back surface of the organic light-emitting panel. and the surface of the frame, and a potting material (17) having thermal conductivity filled in the closed portion surrounded by the wall, the rear surface of the organic light emitting panel and the surface of the frame. The closed portion is filled only with potting material, the frame is formed with a plurality of holes (24) communicating with the closed portion, and the wall portion is formed around the entire circumference of the frame. is provided only .

According to such a display device, a frame is provided on the rear surface of the organic light-emitting panel with a gap therebetween. A potting material is filled in the closed portion between the organic light-emitting panel and the frame. Since the frame is formed with a plurality of holes communicating with the closed portion, after the frame is assembled with the organic light-emitting panel, the precursor of the potting material is poured into the closed space through the holes to provide the potting material in the closed space. can be done. As a result, even if the organic light emitting panel is curved or there is a manufacturing tolerance, the back surface of the organic light emitting panel and the frame can be connected with the potting material without a gap. In addition, since the wall has elasticity, it is possible to form a closed space by absorbing the difference in spacing between the organic light-emitting panel and the frame due to curvature and tolerance. Further, since the frame and the potting material have thermal conductivity, the heat of the organic light-emitting panel can be conducted and the heat can be radiated from the frame to the external space. As a result, heat can be efficiently dissipated from the organic light-emitting panel.

In addition, the disclosed method for manufacturing a display device includes an organic light-emitting panel (21) having a display surface for displaying an image, and a plurality of holes (24) provided at intervals on the back surface opposite to the display surface. A flat plate-shaped frame (14) having thermal conductivity and provided so as to protrude only from the entire circumference of the surface of the frame (14) on the side facing the back surface of the organic light-emitting panel, and having elasticity, a wall portion (18) in contact with the back surface of the organic light emitting panel to maintain a gap between the back surface of the organic light emitting panel and the front surface of the frame, the method comprising: separating the organic light emitting panel and the frame; A first step of assembling to form a closed space (23) surrounded by the wall portion, the rear surface of the organic light emitting panel and the front surface of the frame, and removing heat conductivity from holes other than at least one hole in the frame. a second step of injecting a precursor of a potting material (17) having a hole in the frame to fill the closed space with the precursor; and a third step of curing the precursor to form the potting material. The hole into which the precursor is not injected is a hole for removing the air in the closed space and filling the closed space with only the precursor in the second step, which is the manufacturing method of the display device.

According to this method of manufacturing a display device, the closed space is formed in the first step, but since the wall portion has elasticity, even if there are tolerances due to the curvature of the organic light-emitting panel and manufacturing, it will not be possible to close the space with the organic light-emitting panel. A closed space can be reliably formed by absorbing the difference in the distance from the frame. Then, by the second step and the third step, the potting material can be provided in the closed space by pouring the precursor of the potting material into the closed space through the hole. Since the potting material precursor is injected through the other holes, the air in the closed space can escape through one hole. Therefore, it is possible to prevent air from remaining in the closed space. Moreover, since the potting material is provided in the closed space, even if the organic light emitting panel is curved or there is a manufacturing tolerance, the back surface of the organic light emitting panel and the frame can be connected with the potting material without any gap. Further, since the frame and the potting material have thermal conductivity, the heat of the organic light-emitting panel can be conducted and the heat can be radiated from the frame to the external space. Accordingly, it is possible to manufacture a display device capable of efficiently dissipating heat from the organic light-emitting panel.

It should be noted that the symbols in parentheses of each of the means described above are examples showing the correspondence with specific means described in the embodiments described later.

1 is a perspective view of a vehicle display device viewed from the front side; FIG. The perspective view of the display apparatus for vehicles seen from the back side. 1 is an exploded perspective view of a vehicle display device viewed from the front side; FIG. FIG. 2 is an exploded perspective view of the vehicle display device viewed from the rear side; FIG. 3 is a perspective view of the display unit viewed from the front side; FIG. 3 is a perspective view of the display unit viewed from the back side; The perspective view which expands and shows a part of housing|casing frame. The perspective view which expands and shows a part of housing|casing frame. FIG. 4 is a perspective view showing a process of assembling the display section; Sectional drawing which shows the process of a manufacturing method.

(First embodiment)
A first embodiment of the present disclosure will be described with reference to FIGS. 1 to 10. FIG. The vehicle display device 10 of the first embodiment is installed on a dashboard of a vehicle and configured as a device for displaying various information. The vehicular display device 10 is arranged, for example, in a region located at the center in the vehicle width direction on the upper surface of the dashboard in such a manner that the display surface of the display faces the rear of the vehicle. As shown in FIGS. 1 and 2, the vehicular display device 10 has a rectangular shape when viewed from the front, and has a shape in which a part protrudes partially when viewed from the rear.

The up-down direction and the left-right direction are set in advance in the vehicle display device 10 . The vehicle display device 10 is attached so that its vertical direction is substantially parallel to the vertical direction of the vehicle. In addition, the vehicle display device 10 is mounted so that the left-right direction is substantially parallel to the vehicle width direction, in other words, the vehicle width direction.

As shown in FIGS. 3 and 4, the vehicle display device 10 includes a display section 11, a front panel 12, a rear panel 13, a housing frame 14, a substrate cover 15, a control unit 16, a potting material 17 and a sealer 18. Configured.

The display unit 11 is a display device that displays an image. As shown in FIG. 5, the display unit 11 has a plate shape with a rectangular display surface. The display unit 11 includes a touch unit 20, an organic light-emitting panel 21, and a control substrate 22, as shown in FIG. The organic light-emitting panel 21 is also referred to as an organic EL panel or an organic light-emitting diode (OLED), and may be hereinafter referred to as the organic EL panel 21 .

The driving of the organic EL panel 21 is controlled by a control board 22 . The organic EL panel 21 is flat and has a display surface on the front side for displaying images. The control board 22 is driven based on a control signal from a display controller mounted on the control unit 16 to control a display image. The touch unit 20 is implemented by a translucent touch panel and allows touch operations. It is attached to the front side of the organic EL panel 21 with an optical adhesive. The control board 22 is provided on the rear surface of the organic EL panel 21 .

The front panel 12 has a rectangular frame shape, covers the outer periphery of the display unit 11, and forms a front design. The front panel 12 is attached to the rear side of the organic EL panel 21 with an elastic adhesive as shown in FIG.

As shown in FIG. 6, the housing frame 14 has a flat plate shape and is spaced apart from the rear surface of the organic light emitting panel. The housing frame 14 is a flat plate-shaped frame having thermal conductivity. A flat plate shape includes a flat plate shape and a curved plate shape. The housing frame 14 is made of a material with excellent thermal conductivity, such as an alloy containing aluminum or magnesium. The housing frame 14 has a function of dissipating the heat of the organic EL panel 21 to the outside. A plurality of holes 24 are formed in the housing frame 14 as shown in FIG.

As shown in FIGS. 7 and 10, the sealer 18 is provided so as to protrude from the front surface of the housing frame 14 on the side facing the rear surface of the organic EL panel 21 . The sealer 18 has elasticity, contacts the rear surface of the organic EL panel 21 , and maintains a gap between the rear surface of the organic EL panel 21 and the surface of the housing frame 14 . The sealer 18 forms a closed space 23 surrounded by the rear surface of the organic EL panel 21 and the front surface of the housing frame 14 . The sealer 18 is also called a sealing material or a dam material and functions as a wall. As the material for the sealer 18, for example, rubber, urethane cushion, and silicone gel are selected.

The potting material 17 is made of a material having thermal conductivity. The potting material 17 is provided so as to fill the closed space 23 and fill the closed space 23 . The potting material 17 thermally bonds the organic EL panel 21 and the housing frame 14 and transfers the heat amount of the organic EL panel 21 to the housing frame 14 . Since the closed space 23 disappears when the closed space 23 is filled with the potting material 17, the portion filled with the potting material 17 is called a closed portion.

The potting material 17 is preferably formed by curing a delayed curing material. The delayed curing property is a property in which curing can be started after flowing through the closed space 23 and filling the closed space 23 without immediately curing when injected into the closed space 23 . Therefore, it is desirable to have a delayed curing property, in which curing is initiated several minutes after injection, or curing is initiated by heat.

The potting material 17 is formed by curing a low-viscosity precursor. If the potting material 17 is highly viscous, it may remain in the closed space 23 without flowing. If the potting material 17 has a low viscosity, it can be spread throughout the closed space 23 when injected. The low viscosity also depends on the injection pressure, and means a viscosity that can fill every corner of the closed space 23 when injected at the injection pressure adopted at the time of manufacture.

The potting material 17 is made of a resin material having thermal conductivity, slow curing and low viscosity, such as silicon. In this case, liquid silicon grease is used as the precursor of the potting material 17 .

The board cover 15 is provided on a portion of the rear side of the housing frame 14 and is provided at a position that covers the control board 22 . The substrate cover 15 is formed with openings for connection.

The rear panel 13 has a rectangular frame shape and is a portion that covers the rear side of the housing frame 14 and forms a rear design. The front peripheral portion of the rear panel 13 is fitted or joined to the front panel 12 . The rear panel 13 has an opening through which the substrate cover 15 is exposed.

The control unit 16 is provided in the opening of the rear panel 13 . The control unit 16 is electrically connected to the control board 22 through the opening of the board cover 15 . The control unit 16 has a rectangular parallelepiped box shape and serves as a control section for controlling the display state of the organic EL panel 21 . The control unit 16 controls the image display of the organic EL panel 21 according to the image data for display, the operating state of the passenger, and the like.

Next, heat dissipation of the organic EL panel 21 will be described. Since the organic EL panel 21 is self-luminous, the entire display surface generates heat. Therefore, as a heat dissipation technique for the organic EL panel 21, for example, providing a heat dissipation sheet on the back surface of the organic EL panel 21 is conceivable. However, in the case of heat dissipation sheets, the shape of the organic EL panel 21 may be flat, but if the shape is curved, there is a problem in that the heat dissipation sheets are difficult to follow the shape when sandwiched between them, and the assembly is difficult. Furthermore, if a heat dissipation sheet is used, there is a possibility that a gap may be partially formed between the back surface of the organic EL panel 21 and the heat dissipating property due to the air in the gap if there is a dimensional tolerance. In addition, it is difficult to sandwich the heat-dissipating sheet in a pressed state so as not to create a gap due to dimensional tolerances. Further, in order to improve the heat dissipation, it is preferable to reduce the thickness of the heat dissipation sheet in order to reduce the thermal resistance, but the heat dissipation sheet has limitations in processing.

Therefore, in this embodiment, the potting material 17 is used instead of the heat dissipation sheet. The precursor of the potting material 17 is liquid, and the closed space 23 is filled with the potting material 17 in a liquid state. Therefore, the followability of the shape of the closed space 23 is excellent. Further, not only the shape of the organic EL panel 21 but also the variation in the distance between the organic EL panel 21 and the housing frame 14 can be followed. Also, the potting material 17 can be made thinner to reduce the heat resistance.

Next, a specific manufacturing method will be described with reference to FIGS. 9 and 10. FIG. As shown in (1) of FIGS. 9 and 10 , the display section 11 is laminated on the housing frame 14 . The organic EL panel 21 has the touch portion 20 adhered to the surface via an optical adhesive 30 . An elastic adhesive 31 is applied around the touch portion 20 . The touch portion 20 is adhered to the front panel 12 with an elastic adhesive 31 . When the display unit 11 is assembled to the housing frame 14 , the rear surface of the organic EL panel 21 elastically contacts the tip of the sealer 18 . Then, as shown in FIG. 10(2), a closed space 23 surrounded by the rear surface of the organic EL panel 21, the front surface of the housing frame 14, and the sealer 18 is formed.

Then, as shown in (2) of FIG. 10, the precursor of the potting material 17 is injected using the hole 24 of the housing frame 14 . As shown in FIGS. 8 and 9, the housing frame 14 is formed with a plurality of holes 24 , nine holes 24 in this embodiment, but the precursor is not injected through all the holes 24 . The precursor is injected through other injection holes 24 excluding at least one air vent hole 24 of the housing frame 14 . Of the holes 24 in the housing frame 14 , the holes 24 for removing air that are not injected are holes 24 for removing the air in the closed space 23 . If the precursor is injected into all the holes 24, air may remain inside the closed space 23. FIG. By leaving at least one air vent hole 24 there, air can escape to the outside and the closed space 23 can be filled with the precursor.

After the precursor is injected, the precursor hardens to form the potting material 17 over time. After that or during curing, as shown in (3) of FIG. 10, the remaining parts such as the rear panel 13 are assembled to complete the main parts of the vehicle display device 10 .

As described above, in the vehicle display device 10 of the present embodiment, the housing frame 14 is provided on the back surface of the organic light emitting panel with a gap therebetween. A potting material 17 is filled in the closed portion between the organic light emitting panel and the housing frame 14 . Since a plurality of holes 24 communicating with the closed portion are formed in the housing frame 14, the precursor of the potting material 17 is poured into the closed space 23 through the holes 24 after the housing frame 14 is assembled with the organic light emitting panel. , the potting material 17 can be provided in the closed space 23 . As a result, even if the organic light-emitting panel is curved or there is a dimensional tolerance due to manufacturing, the back surface of the organic light-emitting panel and the housing frame 14 can be connected with the potting material 17 without a gap. In addition, since the sealer 18 has elasticity, it is possible to form the closed space 23 by absorbing the gap between the organic light emitting panel and the housing frame 14 due to curvature and dimensional tolerance. Since the housing frame 14 and the potting material 17 have thermal conductivity, the heat of the organic light-emitting panel can be transferred to the outside space through the housing frame 14 . As a result, heat can be efficiently dissipated from the organic light-emitting panel.

Since the organic EL panel 21 is thin like a film, it can be easily made thin, and is suitable for forming a curved surface. Furthermore, since it is lightweight, it has the advantage of being easily enlarged. However, there is a disadvantage that the entire display surface emits light and generates heat, and it is necessary to ensure heat dissipation. However, in this embodiment, as described above, the closed space 23 is filled with the potting material 17 to realize the heat dissipation structure, so heat dissipation can be reliably performed even if the size and the surface are increased.

According to the manufacturing method of the vehicle display device 10 of the present embodiment, the first step of assembling the organic light emitting panel and the housing frame 14 to form the closed space 23, and the potting material from the hole 24 of the housing frame 14 are removed. A second step of injecting the precursor of 17 and a third step of curing the precursor to form the potting material 17 . The closed space 23 is formed by the first step shown in FIG. 10(1), but since the sealer 18 has elasticity, even if there are tolerances due to the bending of the organic light-emitting panel and manufacturing, the organic light-emitting panel and the frame will not be stuck together. The closed space 23 can be reliably formed by absorbing the difference in spacing. 10(2) and the third step shown in FIG. 10(3), the precursor of the potting material 17 is poured into the closed space 23 through the injection hole 24, and the potting material 17 is removed. It can be provided in the closed space 23 . Since the precursor of the potting material 17 is injected through the injection hole 24 , the air in the closed space 23 can be released through the air vent hole 24 . Therefore, it is possible to prevent air from remaining in the closed space 23 . Also, since the potting material 17 is provided in the closed space 23, even if the organic light emitting panel is curved or there is a dimensional tolerance due to manufacturing, the back surface of the organic light emitting panel and the housing frame 14 are connected with the potting material 17 without any gap. be able to. Since the housing frame 14 and the potting material 17 have thermal conductivity, the heat of the organic light-emitting panel can be transferred to the outside space through the housing frame 14 . Accordingly, it is possible to manufacture the display device 10 for a vehicle that can efficiently dissipate heat from the organic light-emitting panel.

Furthermore, in this embodiment, the potting material 17 is formed by hardening a delayed hardening material. As a result, when the precursor of the potting material 17 is injected into the closed space 23, the closed space 23 can be filled without being cured immediately. Therefore, the heat conductivity of the potting material 17 can be ensured. The delayed curing may be not only a material that cures with time, but also a thermosetting material that cures by heating, or a material that cures with ultraviolet light, humidity, and two liquids.

Further, in this embodiment, a precursor having a low viscosity is cured and formed. As a result, when the precursor of the potting material 17 is injected into the closed space 23, the closed space 23 can be completely filled. Therefore, the heat conductivity of the potting material 17 can be ensured.

Furthermore, in this embodiment, the housing frame 14 is made of a metal material. As a result, even if the potting material 17 requires heating for curing, it can be reliably cured by heating the housing frame 14, and curing can be accelerated.

Also, the potting material 17 can be of a two-liquid curing type, and in the case of a one-liquid curing heating type, curing can be accelerated by heating the housing frame 14 as described above. Further, by providing a plurality of holes 24 in the housing frame 14, it is possible to control the filling location and the filling speed. As a result, the degree of freedom in designing the installation equipment can be improved.

Furthermore, in this embodiment, the potting material 17 is provided over substantially the entire back surface of the organic EL panel 21 . The housing frame 14 also has a surface area substantially the same as the rear surface of the organic EL panel 21, and is provided with a potting material 17. As shown in FIG. Therefore, a heat dissipation area can be secured over a wide range of the rear surface of the organic EL panel 21 . This can improve the cooling performance.

Further, in this embodiment, a sealer 18 is provided. Since the sealer 18 is added to the entire circumference of the housing frame 14 as shown in FIG. 7, the adhesion with the organic EL panel 21 can be enhanced. Thereby, the filling operation of the potting material 17 can be easily realized.

(Other embodiments)
Although the preferred embodiments of the present disclosure have been described above, the present disclosure is not limited to the above-described embodiments, and various modifications can be made without departing from the gist of the present disclosure.

The structures of the above-described embodiments are merely examples, and the scope of the present disclosure is not limited to the scope of these descriptions. The scope of the present disclosure is indicated by the description of the claims, and further includes all changes within the meaning and range of equivalents to the description of the claims.

In the above-described first embodiment, the display device is realized for vehicles, but it is not limited to vehicles and may be used for other purposes.

In the first embodiment described above, the display unit 11 also has a function as a touch panel, but the display device may have no function as a touch panel. Further, the display unit 11 has the organic EL panel 21, but may be another display method such as a liquid crystal display panel.

In the first embodiment described above, the sealer 18 is provided on the entire circumference of the housing frame 14, but the configuration is not limited to this. For example, the sealer 18 may be provided by dividing it into grids. In this case, by providing holes 24 in the housing frame 14 so as to correspond to the partitioned portions, the partitioned closed spaces 23 can be filled with the potting material 17 .

Further, in the above-described first embodiment, the housing frame 14 and the front panel 12 are separate bodies, but they may be integrated. In the case of being integrated, it is necessary to fix the touch unit 20 to the housing frame 14 , but the sealer 18 may function as an adhesive, that is, the sealer 18 may have the function of the elastic adhesive 31 .

DESCRIPTION OF SYMBOLS 10... Display apparatus for vehicles 11... Display part 12... Front panel 13... Rear panel 14... Housing frame (frame) 15... Board cover 16... Control unit 17... Potting material 18... Sealer (wall part) 20... Touch part 21... Organic EL panel (organic light emitting panel) 22 Control board 23 Closed space 24 Hole

Claims (4)

an organic light-emitting panel (21) having a display surface for displaying an image;
a flat frame (14) having thermal conductivity and spaced apart from the rear surface opposite to the display surface;
It is provided so as to protrude from the entire circumference of the surface of the frame on the side facing the back surface of the organic light emitting panel, has elasticity, contacts the back surface of the organic light emitting panel, and contacts the back surface of the organic light emitting panel. a wall (18) maintaining spacing with the surface of said frame;
a thermally conductive potting material (17) filled in a closed portion surrounded by the wall portion, the back surface of the organic light emitting panel, and the front surface of the frame;
The closed portion is filled only with the potting material,
The frame is formed with a plurality of holes (24) communicating with the closed portion ,
The display device , wherein the wall portion is provided only around the entire circumference of the frame . 2. The display device according to claim 1, wherein the potting material is formed by hardening a delayed hardening material. 3. The display device according to claim 1, wherein the potting material is formed by curing a precursor having a low viscosity. an organic light-emitting panel (21) having a display surface for displaying an image;
a flat plate-like frame (14) provided at intervals on the back surface opposite to the display surface, having a plurality of holes (24) formed therein and having thermal conductivity;
provided so as to protrude only from the entire circumference of the surface of the frame on the side facing the back surface of the organic light emitting panel, has elasticity, contacts the back surface of the organic light emitting panel, and contacts the back surface of the organic light emitting panel; and a wall (18) maintaining a distance between the surface of the frame, comprising:
a first step of assembling the organic light-emitting panel and the frame to form a closed space (23) surrounded by the wall portion, the rear surface of the organic light-emitting panel, and the front surface of the frame;
a second step of injecting a precursor of a potting material (17) having thermal conductivity from holes other than at least one hole of the frame to fill the closed space with the precursor;
a third step of curing the precursor to form the potting material;
Manufacture of a display device, wherein the holes of the frame into which the precursor is not injected are holes for removing air from the closed space and filling only the precursor into the closed space in the second step. Method.

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