Display device

Abstract

The display device includes: a display panel; and a housing surrounding a rear surface, a side surface, and a front peripheral edge of the display panel, the housing including a rear cover facing the rear surface of the display panel, where the rear cover includes: a plurality of spaced apart parallel straight line portions extending in a first direction parallel to a front plane of the display panel, the display device includes a plurality of linear portions having a rear surface and rounded portions at both ends of each of the linear portions extending in a first direction, and a plurality of connecting portions extending in the first direction, the connecting portions being connected to adjacent ones of the linear portions, the connecting portions being positioned at a depth inward toward the display panel with respect to the rear surface of the adjacent linear portions.

Description

[0001] This application is a divisional application of the Chinese national phase application, which was filed on February 16, 2021, with international application number PCT / JP2021 / 005733 and titled "Display Device". The Chinese national phase application entered the national phase on September 23, 2022, with application number 202180024169.9 and titled "Display Device". Technical Field

[0002] This technology relates to a technology for display devices having a structure formed by injection molding. Background Technology

[0003] Some display devices, such as televisions, have structures formed by injection molding. In such display devices, for example, in some cases, a back cover, which is part of the housing, is formed by injection molding. Multiple holes are formed in the back cover for air intake and exhaust to cool heat generated inside the housing (see, for example, Patent Document 1). This portion with multiple holes is formed in a grid shape.

[0004] Existing technical documents

[0005] Patent documents

[0006] Patent Document 1: Japanese Patent Application Publication No. 2011-095772 Summary of the Invention

[0007] The problem to be solved by the present invention

[0008] Simultaneously, when the lattice-like sections are formed through injection molding, the molten resin splits and joins. In some cases, a weld line is formed at the point where the molten resin converges.

[0009] Because the portion forming a weld line has lower strength than other portions, the formation of a weld line can lead to cracks or defects. For example, countermeasures are needed when cracks or defects appear in an impact test of a product.

[0010] This technology was developed in view of this problem, and its purpose is to improve the strength of the portion forming the hole.

[0011] Solution to the problem

[0012] The display device according to this technology includes: a plurality of linear portions, which extend in the first direction and are positioned separately from each other in the second direction when the three directions are orthogonal to each other as a first direction, a second direction, and a third direction; and a connecting portion, which connects corresponding portions of two adjacent linear portions in the second direction. The linear portions and the connecting portion are integrally formed by injection molding. The linear portions have a base extending in the first direction and a pair of protrusions protruding from two ends of the base in the third direction in the second direction, and the two ends of the connecting portion are continuous with the corresponding front ends of the protrusions of the two adjacent linear portions.

[0013] Therefore, holes are formed between the straight sections. Furthermore, during injection molding, the flow rate of the molten resin forming the base is higher than the flow rate of the molten resin forming the connecting section. Therefore, a convergence point (weld line) of the molten resin diverted by the holes is easily formed in the connecting section.

[0014] In the above-described display device, the plurality of connecting portions can be arranged separately from each other in a first direction.

[0015] Therefore, the strength of the straight section is improved.

[0016] In the above-mentioned display device, the pitch width a of the connecting parts adjacent to each other in the first direction, the length b of the connecting parts in the second direction, the thickness t1 of the base in the third direction, and the thickness t2 of the connecting parts in the third direction can satisfy the following formula:

[0017] (t1 / t2) 3 >a / b

[0018] Therefore, fusion lines are easily formed in the joint.

[0019] In the aforementioned display device, the pitch width a can be greater than the length b.

[0020] Therefore, the space enclosed by the straight part and the connecting part is an elongated hole.

[0021] In the aforementioned display device, the thickness t1 can be greater than the thickness t2.

[0022] Therefore, the flow rate of the molten resin when forming the connecting part is slower than the flow rate of the molten resin when forming the base of the straight part.

[0023] In the above-mentioned display device, the thickness t1 can be greater than the thickness t3 of the protrusion in the second direction.

[0024] Therefore, the flow rate of the molten resin when forming the protrusion is slower than the flow rate of the molten resin when forming the base of the straight section.

[0025] In the above-mentioned display device, thickness t2 and thickness t3 can be the same thickness.

[0026] Therefore, the thickness of the connecting part or protrusion will not be reduced excessively.

[0027] In the above-described display device, at least a portion of the outer surfaces of the straight portion on both sides in the second direction can be formed as inclined surfaces, which approach each other in the second direction as the distance from the connecting portion in the third direction increases.

[0028] Therefore, the cross-sectional area of ​​the space forming the continuity between the base and the protrusion in the mold used for injection molding is reduced, and the molten resin hardly flows into the protrusion.

[0029] The aforementioned display device further includes a rear cover disposed behind the display panel. The straight section and the connecting section may be disposed within the rear cover.

[0030] Therefore, weld lines are easily formed in the connection part of the back cover.

[0031] In the above-mentioned display device, the base may be located on the outer surface side of the connecting part.

[0032] Therefore, the connection part that is easy to form a fusion line is located on the side closer to the internal space of the display device than the base.

[0033] In the above-described display device, the space surrounded by adjacent straight sections and connecting sections adjacent to each other in the first direction can be formed as an air intake and exhaust port.

[0034] Therefore, heat generated from electronic substrates, etc., can be discharged through the air intake and exhaust vents, and the strength of the structure used to form the air intake and exhaust vents can be maintained above a certain level.

[0035] The display device according to the present technology includes: a display panel; and a housing surrounding a rear surface, side surfaces and a front peripheral edge of the display panel, the housing including a rear cover facing the rear surface of the display panel, wherein the rear cover includes: a plurality of spaced-apart parallel straight portions extending in a first direction parallel to the front plane of the display panel, the straight portions having a rear surface and rounded corners at both ends of each straight portion extending in the first direction, and a plurality of connecting portions extending in the first direction, the connecting portions connecting to adjacent straight portions, the connecting portions being positioned at a depth inward toward the display panel relative to the rear surface of the adjacent straight portions. Attached Figure Description

[0036] Figure 1 It is a perspective view of the display device.

[0037] Figure 2 The display device is different from Figure 1 A perspective view in the direction of the view.

[0038] Figure 3 This is a rear view of the back cover.

[0039] Figure 4 It is along Figure 3 The end face view taken from line AA in the diagram.

[0040] Figure 5 This is a schematic diagram showing the state of elastic deformation of the back cover caused by applying an impact to the outer surface of the back cover.

[0041] Figure 6 It is along Figure 3 The end face view taken from line BB in the image.

[0042] Figure 7 It is along Figure 3 The end face view of the line CC in the image.

[0043] Figure 8 This is a rear view showing the process of forming the back cover using molten resin.

[0044] Figure 9 It is along Figure 8 The end face view captured by line FF in the image.

[0045] Figure 10 It shows the continuation Figure 8 Rear view of the subsequent process of forming the back cover using molten resin.

[0046] Figure 11 It is along Figure 10 The end face view captured by line FF in the image.

[0047] Figure 12 It shows the continuation Figure 10 Rear view of the subsequent process of forming the back cover using molten resin.

[0048] Figure 13 It is along Figure 12 The end face view captured by line FF in the image.

[0049] Figure 14 It shows the continuation Figure 12 Rear view of the subsequent process of forming the back cover using molten resin.

[0050] Figure 15 It is along Figure 14 The end face view captured by line FF in the image.

[0051] Figure 16 It is an end view showing the thickness of the base, the thickness of the protrusion, and the thickness of the connecting part.

[0052] Figure 17 This is an end-view view used to describe an example that takes into account the time it takes for molten resin to flow through the protrusion.

[0053] Figure 18This is a schematic diagram showing exemplary dimensions.

[0054] Figure 19 These are cross-sectional and end-face views showing the straight section and connecting section in the modified example.

[0055] Figure 20 This is a view showing one end of the connector in a connected state. Detailed Implementation

[0056] The implementation methods will be described below in the following order.

[0057] <1. Display device configuration>

[0058] <2. Back Cover Structure>

[0059] <3. Molding method of the back cover in injection molding>

[0060] <4. Pressure loss of molten resin>

[0061] <5. Exemplary Dimensions>

[0062] <6. Variations>

[0063] <7. Summary>

[0064] <8. This technology>

[0065] <1. Display device configuration>

[0066] Reference Figure 1 and Figure 2 The configuration of the display device 1 described herein is illustrated. Note that the display device 1 is a device that displays video or images thereon, such as a television device or a monitor device.

[0067] The display device 1 includes: a display unit 2 having a generally rectangular shape; a support unit 3 attached to the rear surface of the display unit 2 and extending in the vertical direction; and a base portion 4, the lower end of the support unit 3 being attached to the base portion 4, and the base portion 4 having a flat shape in the horizontal direction to stabilize the posture of the display unit 2 and the support unit 3.

[0068] In the following description, the front-to-back direction is described as the user's side viewing the video (image) displayed on the display device 1, referred to as the front side. Additionally, the direction of gravity is sometimes described as the up-down direction, and the horizontal direction as the left-to-right direction. Note that the left-to-right direction uses the view from the back of the display device 1.

[0069] It should be noted that the terms "first direction," "second direction," and "third direction" in the claims refer to the aforementioned vertical, horizontal, and front-back directions, respectively. However, these directions are determined according to the opening directions of the air intake and exhaust ports, as described later. Specifically, since the air intake and exhaust ports described in this embodiment are rearward-opening holes, the first direction is the vertical direction. For example, in the case where the air intake and exhaust ports are downward-opening holes, the first direction is the front-back direction, the second direction is the horizontal direction, and the third direction is the vertical direction.

[0070] It should be noted that these directions are for descriptive purposes only, and the invention is not limited to these directions in the implementation of this technology.

[0071] The display unit 2 includes: a housing 5 that houses each unit such as electronic circuits for displaying images and has an opening that faces forward; and a display panel 6 that displays images and is configured to be visible from the front through the opening in the housing 5.

[0072] For example, the housing 5 includes a frame 7 formed as the front side, a rear cover 8 formed as the rear side and positioned behind the display panel 6, and various operation symbols (not shown).

[0073] The frame 7 includes: an upper surface portion 9, which is vertically oriented and extends horizontally; a pair of side surfaces 10 and 10, which are horizontally oriented and continuous with the left and right ends of the upper surface portion 9, extending vertically; a lower surface portion 11, which is vertically oriented and has left and right ends continuous with the lower portions of the pair of side surfaces 10 and 10; and a frame-shaped portion 12, which is formed in a front-back oriented frame shape. The outer periphery of the frame-shaped portion 12 is continuous with each front end of the upper surface portion 9, the side surfaces 10 and 10, and the lower surface portion 11.

[0074] The back cover 8 is formed by injection molding into a plate-shaped resin component facing forward and backward, and is attached from the rear side to the rear end of the frame 7.

[0075] The rear cover 8 is provided with an air intake hole for drawing air into the internal space and an air exhaust hole for expelling air from the internal space. Heat discharged from the substrate and other components arranged inside the display unit 2 is cooled through the air intake hole and the air exhaust hole. These air intake holes and air exhaust holes will be collectively referred to as air intake and air exhaust holes 13.

[0076] Multiple air intake and exhaust holes 13 are configured in the rear cover 8 as rearward-opening holes, downward-opening holes, upward-opening holes, and side-opening holes. Alternatively, in addition to air intake and exhaust holes opening in these directions, air intake and exhaust holes 13 opening in an oblique direction can be used. The portion forming the multiple air intake and exhaust holes 13 is configured in a grid shape.

[0077] It should be noted that the intake and exhaust vents 13 can be located within the frame 7. For example, in Figure 2 The air intake and exhaust vents 13 shown in the figure are examples of holes formed in the rear cover 8 to open rearward and holes formed in the lower surface portion 11 of the frame 7 to open downward.

[0078] In the following description, the intake and exhaust port 13 that opens to the rear side of the rear cover 8 will be described. Various shapes of multiple intake and exhaust ports 13 can be considered, but in this example, an intake and exhaust port 13 with an elongated shape in the vertical direction is taken as an example.

[0079] The display panel 6 has a laminated structure including a diffuser plate, an optical sheet, a wiring layer, etc.

[0080] <2. Back Cover Structure>

[0081] Reference Figure 3 Describe the specific configuration of the back cover 8.

[0082] The predetermined portion of the rear cover 8 includes: a central portion 14 having a plurality of air intake holes 13; and an outer peripheral portion 15 which is another part.

[0083] The outer peripheral portion 15, excluding the outermost edge 15a, includes: a plurality of straight portions 16 extending in the vertical direction and positioned to be separated from each other in the horizontal direction; and a connecting portion 17 positioned between the straight portions 16. A rearwardly opening recess is formed between adjacent straight portions 16.

[0084] Next, we will refer to Figure 4 Describe the straight section 16 and the connecting section 17.

[0085] The straight portion 16 includes: a base 18 extending in the vertical direction and having a generally cuboid shape; and a pair of protrusions 19 and 19, protruding forward from the left and right ends of the base 18 and having a generally cuboid shape extending in the vertical direction.

[0086] Here, the protrusion 19 that protrudes from the left end of the base 18 is called protrusion 19L, and the protrusion 19 that protrudes from the right end is called protrusion 19R. In addition, when there is no distinction between left and right protrusions, they are simply referred to as protrusion 19.

[0087] The left and right ends of the connecting portion 17 are continuous with the front end portion 20 of the protrusion 19R of the adjacent straight portion 16 and the front end portion 20 of the protrusion 19L of the straight portion 16, respectively.

[0088] The rear surface of the base 18 is formed as part of the outer surface 21 of the display device 1. The outer surface 21 undergoes surface treatments such as smoothing by eliminating unevenness, and embossing treatments to form unevenness. Furthermore, the outer surface 21 is also the part to which impact is applied during impact testing. In addition, the outer surface 21 is one of the parts that may be subjected to impacts from users, etc., after commercialization.

[0089] In the rear cover 8, the horizontal cross-sectional shape is formed into an uneven shape (bellows shape) by means of the straight portion 16 and the connecting portion 17. In the event of an impact applied to the rear cover 8, such as... Figure 5 As shown, near the point D where the impact is applied, each part of the rear cover 8 deforms, causing adjacent bases 18 and 18 to approach each other and widening the gap between a pair of protrusions 19L and 19R of the straight portion 16.

[0090] Therefore, the impact applied to the rear cover 8 is absorbed by deformation before being transmitted to the connecting part 17 and the protrusion 19, and thus no large stress is generated in the connecting part 17 and the protrusion 19.

[0091] Next, we will refer to Figure 3 , Figure 6 and Figure 7 Describe the central part 14 of the back cover 8.

[0092] The central portion 14 of the rear cover 8 includes a plurality of straight portions 16 arranged apart from each other in the left-right direction and a plurality of connecting portions 22 arranged apart from each other in the up-down direction. That is, the plurality of connecting portions 22 are arranged between two adjacent straight portions 16, and the strength of the straight portions 16 is improved.

[0093] like Figure 7 As shown, the connecting portion 22 has a shape similar to the horizontal cross-section of the connecting portion 17. That is, the connecting portion 22 has a cuboid shape extending in the left-right direction, and the left and right ends are continuous with the front end portion 20 of the protrusion 19R of the adjacent straight portion 16 and the front end portion 20 of the protrusion 19L of the straight portion 16, respectively.

[0094] Multiple connecting parts 22 are configured to be separated from each other in the vertical direction.

[0095] The space surrounded by the straight sections 16 and 16 adjacent to each other in the left-right direction and the connecting sections 22 and 22 adjacent to each other in the up-down direction is formed as the air intake and exhaust port 13. Heat generated by the electronic substrate and the like arranged inside the housing 5 can be released to the outside through the air intake and exhaust port 13. Therefore, good heat dissipation can be ensured in the display device 1.

[0096] It should be noted that the space surrounded by the straight sections 16 and 16 adjacent to each other in the left and right directions, the end of the connecting section 17, and the connecting section 22 is also formed as the intake and exhaust port 13.

[0097] Next, the length and thickness of each part of the back cover 8 will be described (see Figure 3 and Figure 7 ).

[0098] The thickness of the base 18 in the front-rear direction is defined as thickness t1. The thickness of the connecting portion 22 in the front-rear direction is defined as thickness t2. The thickness of the protrusion 19 in the left-right direction is defined as thickness t3. The pitch width in the vertical direction between the connecting portions 22 is defined as pitch width a. The length of the connecting portion 22 in the left-right direction is defined as length b.

[0099] In this embodiment, for example, the thickness t1 is greater than both thickness t2 and thickness t3. Furthermore, the thicknesses t2 and t3 are the same.

[0100] In addition, the pitch width a is greater than the length b.

[0101] Note that the conditions for satisfying these thicknesses and lengths will be described again later.

[0102] <3. Molding method of the back cover in injection molding>

[0103] As described above, the back cover 8 is formed by injection molding of molten resin.

[0104] The process of forming each part of the back cover 8 by injection molding will be described in chronological order below (see below). Figures 8 to 15 ).

[0105] Figure 8 This is a diagram showing the state in which molten resin PL flows in from inlet position E to form the portion shown in the rear cover 8. Inlet position E is, for example, at... Figure 8 The portion shown is closest to the gate (not shown). It should be noted that in... Figure 8 The inflow position E shown is just an example and can be set arbitrarily according to the position of the gate set in the back cover 8.

[0106] Furthermore, the number of inflow locations E is not necessarily one, and multiple inflow locations E can be set.

[0107] Note that when the back cover 8 is formed by injection molding, the gate can be located at any position. Furthermore, the number of gates can be one or more.

[0108] Note that the following figures show the positional relationship between the back cover 8, which is the final molded product, and the molten resin PL (the satin portion in the figures) at this point. Furthermore, the movement of the molten resin along... Figure 8 The flow state, etc., within the internal space (cavity) of the mold cut by the dotted-dash line FF shown.

[0109] like Figure 8 and Figure 9 As shown, the molten resin PL flows first in the space forming the straight section 16A, which is closer to the inflow position E than the space forming the straight section 16B.

[0110] As described above, the thickness t1 of the base 18 in the front-back direction is greater than the thickness t3 of the protrusion 19 in the left-right direction. Therefore, the velocity of the molten resin PL flowing in the front-back direction in the space of the protrusion 19 is faster than the velocity of the molten resin PL flowing in the vertical direction in the space forming the base 18. Therefore, there is a state where the molten resin flows into the base 18 but does not flow into the protrusion 19. Therefore, it is possible to delay the time until the molten resin PL reaches the space forming the connection 22, and it is possible to easily form a fusion line W in the connection 22.

[0111] Subsequently, as Figure 10 and Figure 11 As shown, molten resin PL flows from the space forming the straight portion 16A through the space forming the protrusion 19R to the space forming the connecting portion 22, and from the space forming the base 18 of the straight portion 16B to the space forming the protrusion 19L.

[0112] Subsequently, as Figure 12 and Figure 13 As shown, molten resin PL flows from the space forming the straight portion 16A to the space forming the connecting portion 22, and flows from the space forming the protrusion 19L toward the space forming the connecting portion 22.

[0113] Subsequently, as Figure 14 and Figure 15 As shown, molten resin PL converges in the space forming the connection portion 22. Therefore, a weld line W of molten resin PL is formed in the space forming the connection portion 22.

[0114] As described above, the thickness t1 of the base 18 in the front-rear direction is greater than the thickness t2 of the connecting portion 22 in the front-rear direction. Therefore, the velocity of the molten resin PL flowing in the left-right direction within the space forming the connecting portion 22 (see...) Figure 13 and Figure 15 The velocity of the molten resin PL flowing in the vertical direction within the space forming the base 18 (see...) Figure 12 and Figure 14 )slow.

[0115] Therefore, a fusion line W can be easily formed in the connecting part 22.

[0116] It should be noted that the thickness t2 of the connecting part 22 in the front-to-back direction and the thickness t3 of the protrusion 19 in the left-to-right direction can be the same.

[0117] In order to form a confluence point of molten resin PL in the connecting portion 22, it is conceivable to reduce the thickness t3 of the protrusion 19 or the thickness t2 of the connecting portion 22. If only one of the thicknesses t2 and t3 is reduced, the strength of the portion with reduced thickness is reduced, and cracking or breakage may occur.

[0118] When the thickness t2 of the connecting portion 22 is the same as the thickness t3 of the protrusion 19, the connecting portion 22 and the protrusion 19 can be formed to have a specific thickness compared to the case where only one of the thicknesses t2 and t3 is reduced. Therefore, while ensuring the strength of the protrusion 19 and the connecting portion 22, the flow rate of the molten resin PL during the formation of the protrusion 19 and the connecting portion 22 can be reduced, and the durability of the back cover 8 can be improved.

[0119] Furthermore, as shown in the figures, the base 18 is located on the outer surface side (rear side) of the connecting portion 22. Therefore, the connecting portion 22, which is easier to form a fusion line W, is closer to the internal space side of the display device 1 than the straight portion 16.

[0120] Therefore, impacts are less likely to be applied to the connection 22 where a fusion line W might form, and thus fractures and cracks caused by the fusion line W are less likely to occur, improving the durability of the back cover 8. Furthermore, when the base 18 serves as the outer surface 21 of the display device 1, impacts can be applied to the base 18 during impact testing. In this case, since the fusion line W is not formed in the base 18, it easily passes the impact test, and no countermeasures are required. Therefore, unnecessary downtime can be suppressed.

[0121] <4. Pressure loss of molten resin>

[0122] During injection molding, the flow rate of molten resin PL corresponds to the magnitude of the pressure loss generated as the molten resin PL flows within the mold. That is, the greater the pressure loss, the lower the flow rate.

[0123] The pressure loss ΔP is calculated using the following formula (1).

[0124] ΔP=12μLQ / (wt 3 ...Equation (1)

[0125] μ represents the viscosity of the molten resin PL. L represents the flow distance. Q represents the flow rate of the molten resin PL. w represents the width of the flow path through which the molten resin PL flows. t represents the thickness of the flow path.

[0126] In the following text, specific examples of pressure loss associated with the rear cover 8 will be described using the pitch width a in the vertical direction of multiple connecting parts 22 that are far apart from each other in the vertical direction and the length b in the horizontal direction of the connecting parts 22.

[0127] In order to form a fusion line W in the portion outside the straight section 16, it is required that the straight section 16 ( Figure 9 Before the molten resin PL of the straight section 16A in the middle completes the formation of the connecting section 22, it flows through the adjacent straight section 16 ( Figure 9 The base 18 is formed by molten resin PL in the straight section 16B.

[0128] To meet this condition, the time required for the base 18 of the straight section 16 to span the pitch width a is shorter than the time required for the connecting section 22 to span the length b.

[0129] When the base 18 of the straight section 16 spans the pitch width a, the pressure loss ΔP1 of the molten resin PL can be expressed by the following formula (2) (see Figure 16 ).

[0130] ΔP1=12μaQ / (w×t1 3 ...Equation (2)

[0131] Furthermore, the pressure loss ΔP2 when the molten resin PL flows from one end of the connector 22 to the other end can be expressed by the following formula (3) (see Figure 16 ).

[0132] ΔP2=12μbQ / (w×t2 3 ...Equation (3)

[0133] In order to form a fusion line W in the connection part 22, the pressure loss ΔP1 is required to be less than the pressure loss ΔP2.

[0134] That is, the following equation (4) is derived from equations (2) and (3).

[0135] (t1 / t2) 3 >a / b..Equation (4)

[0136] By satisfying the above expression (4), during injection molding, the molten resin PL flows from the base 18 of the adjacent straight portion 16 into the connecting portion 22 before the entire connecting portion 22 is formed when the base 18 is formed. Therefore, since no weld line W is formed in the straight portion 16, the strength of the straight portion 16 can be improved.

[0137] Note that various combinations of variables t1, t2, a, and b that satisfy equation (4) can be considered.

[0138] However, the value of variable t1 is the thickness of the base 18 in the front-rear direction, which is naturally determined by the design when considering the strength and weight of the rear cover 8. Furthermore, the value of variable a is the pitch width between the connecting portions 22 in the vertical direction, which is naturally determined when considering the size of the intake and exhaust ports 13. Additionally, the value of variable b is the length of the connecting portion 22 in the left-right direction, and is naturally determined when considering the size of the intake and exhaust ports 13.

[0139] Therefore, based on the values ​​of variables t1, a, and b, the value of variable t2 is derived from equation (4) as a value less than the predetermined value.

[0140] In order to form a fusion line W in the connecting part 22, in order to satisfy equation (4), the variable t2 needs to be less than a predetermined value. However, on the other hand, considering the durability of the back cover 8, the thickness t2 of the connecting part 22 in the front-rear direction cannot be too small, and it is desirable to make the variable t2 as large as possible.

[0141] Therefore, the conditions for increasing the value of thickness t2 will be described below.

[0142] In the display device 1, it is desirable to form a fusion line W in the connecting portion 22 to ensure high strength of the back cover 8. However, it is also permissible to form a fusion line W in the protrusion 19 other than the base 18 or in the connecting portion 22. Even if the fusion line W is formed in the protrusion 19, sufficient strength of the back cover 8 can be ensured. Furthermore, by relaxing the expression (4) which is the condition for forming a fusion line W in the protrusion 19 to the condition for forming a fusion line W in the protrusion 19 or the connecting portion 22, the value of the variable t2 can be increased as follows.

[0143] In order to form a fusion line W in the protrusion 19 or the connecting portion 22, the total value of the pressure loss of the molten resin PL when forming the protrusion 19 of the straight portion 16 and the pressure loss ΔP2 of the molten resin PL when forming the connecting portion 22 only needs to be greater than the pressure loss ΔP1.

[0144] That is, such as Figure 17 As shown, when the path of the molten resin PL flowing from the space of the protrusion 19R forming the straight section 16A through the space of the connecting section 22 to the space of the protrusion 19L forming the straight section 16B is defined as path G, the pressure loss ΔP3 of the molten resin PL flowing through path G only needs to be greater than the pressure loss ΔP1.

[0145] Here, if only one of the thickness t2 of the connecting portion 22 in the front-rear direction and the thickness t3 of the protrusion 19 in the left-right direction decreases, there is a possibility that the strength of the portion with the reduced thickness will be excessively reduced. Therefore, it is desirable that the thickness t2 of the connecting portion 22 in the front-rear direction and the thickness t3 of the protrusion 19 in the left-right direction have the same thickness.

[0146] The pressure loss ΔP3 when thicknesses t2 and t3 are the same is expressed by the following formula.

[0147] ΔP3=12μb'Q / (w×t2 3 ... Equation (5)b' is the path length of path G, and can be expressed by the following equation (6).

[0148] b' = 2c - t² + b + t³

[0149] =2c-t2+b+t2

[0150] =2c+b...Equation (6)

[0151] In order to form a fusion line W in the part of path G, namely protrusion 19 or connection 22, it is only necessary to make the pressure loss ΔP3 greater than the pressure loss ΔP1. Therefore, equation (7) can be derived from equations (2), (5) and (6).

[0152] (t1 / t2) 3 >a / b'

[0153] (t1 / t2) 3 >a / (2c+b)...Equation (7)

[0154] Based on equations (4) and (7), the possible values ​​of the extended thickness t2 are as follows.

[0155] Since c>0, (2c+b) is a value greater than b, and a / (2c+b) in equation (7) is a value less than a / b.

[0156] In contrast to equation (4), equation (7) indicates that (t1 / t2) can be a smaller value. Therefore, t2 can be set to a value greater than t2 in equation (4) through equation (7).

[0157] By determining the thickness t2 based on equation (7), the thickness t2 of the protrusion 19 and the connecting portion 22 can be further increased, thereby improving the strength of the protrusion 19 and the connecting portion 22. Furthermore, during injection molding, after the molten resin PL forms the protrusion 19R and the connecting portion 22 at the base 18 of the straight portion 16A, and before the protrusion 19L of the adjacent straight portion 16B is formed, the molten resin PL flows from the base 18 of the adjacent straight portion 16B into the protrusion 19L. That is, in the cavity of the mold, the molten resin PL flowing from the space forming each adjacent straight portion 16 to the space forming the connecting portion 22 located therebetween merges at the connecting portion 22 or the protrusion 19. Therefore, no weld line W is formed in the straight portion 16, and thus the strength of the straight portion 16 can be further improved.

[0158] Note that when the pitch width a of the connecting portion 22 is greater than the length b of the connecting portion 22, the space surrounded by the straight portion 16 and the connecting portion 22 is formed into an elongated air intake and exhaust hole 13. Therefore, it is possible to prevent fingers, foreign objects, etc. from entering the display device 1 through the elongated air intake and exhaust hole 13.

[0159] Note that it has been described here that the condition for thickness t2 can be relaxed by using variables other than thickness t2 as constants, but the condition for variables other than thickness t2 can be relaxed by changing the combination of variables to constants.

[0160] <5. Exemplary Dimensions>

[0161] Figure 18 Exemplary dimensions of the straight portion 16 and the connecting portion 22 are shown.

[0162] The left and right ends of the rear end portion of the base 18 are respectively formed as corner portions 18a. In addition, the inner ends of the front ends 20 and 20 of the protrusions 19L and 19R are respectively formed as inner corner portions 20a and 20a.

[0163] First, it is preferable that the distance d between the portions of protrusions 19R and 19L that protrude from a base 18 and are continuous with the base 18 is at least 2.3 times the thickness t2 of the connecting portion 22 and the thickness t3 of the protrusion 19.

[0164] Considering the ease of injection molding, it is difficult to form the thickness t2 of the connecting portion 22 and the thickness t3 of the protrusion 19 to be less than 1 mm. Therefore, for example, assuming that the thickness t2 of the connecting portion 22 and the thickness t3 of the protrusion 19 are 1 mm, the distance d is preferably 2.1 mm or more.

[0165] Therefore, the rate of molten resin when forming protrusion 19 and connecting portion 22 is slow enough to be slower than the rate of molten resin PL when forming base 18, so that fusion line W can be easily formed in the portion outside base 18.

[0166] The corner portion 18a and the inner corner portion 20a are preferably chamfered with a radius of R to prevent breakage, etc. It is preferable to apply a chamfer with a radius of R of, for example, 0.5 mm to 1 mm to the corner portion 18a, and a chamfer with a radius of R of, for example, 0.3 mm to the inner corner portion 20a.

[0167] In addition, the corners at both ends of the rear end of the connecting part 22 are formed to be more than 180 degrees, making it difficult to generate debris, so there is no need to perform R chamfering.

[0168] Similarly, since the corner of the continuous portion between the base 18 and the protrusion 19 is also formed to be 180 degrees or more, it is not necessary to perform a chamfer.

[0169] Furthermore, in order to facilitate the demolding of the back cover 8, which is a molded product, from the mold, it is desirable that the angle r formed by the extension direction and the front-rear direction of the protrusion 19 is greater than 0 degrees. For example, the angle r is 0.5 degrees or more.

[0170] Next, examples of possible values ​​of the variables t1, t2, a, and b used in equation (4) above will be described.

[0171] The maximum value of the pitch width 'a' of the connecting portion 22 in the vertical direction is preferably below a predetermined value so that the strength of the straight portion 16 is not reduced. Furthermore, from the viewpoint of heat dissipation efficiency, it is preferable that the pitch width 'a' is above the predetermined value. For example, the pitch width is 3 mm or more and 30 mm or less.

[0172] Ideally, the length b of the connecting portion 22 in the left-right direction is set to a predetermined value or less to prevent fingers or the like from entering through the air intake and exhaust ports 13. Furthermore, from the viewpoint of heat dissipation efficiency, it is preferable that the length b is a predetermined value or more. For example, the length b is 1 mm or more and 30 mm or less.

[0173] From the viewpoint of facilitating injection molding, the thickness t1 of the base 18 in the front-to-back direction is preferably set to a predetermined value or higher. Furthermore, from the viewpoint of weight and cost, it is preferable that the thickness t1 is set to a predetermined value or lower. For example, the thickness t1 is 0.5 mm or more and 4 mm or less.

[0174] From the viewpoint of ease of injection molding, the thickness t2 of the connecting portion 22 in the front-to-back direction is preferably set to a predetermined value or higher. Furthermore, from the viewpoint of weight and cost, the thickness t2 is preferably set to a predetermined value or lower. For example, the thickness t2 is 0.5 mm or more and 4 mm or less.

[0175] In order to form a fusion line W in the portion other than the base 18 of the straight portion 16, the relationship between thicknesses t1 and t2 is important. That is, it is desirable that thicknesses t1 and t2 be set to satisfy the above equations (4) and (7), while satisfying the conditions of 0.5 mm or more and 4 mm or less, respectively.

[0176] <6. Variations>

[0177] A modified example of the structure of the straight portion 16 and the connecting portion 22 that form the intake and exhaust holes 13 will be described.

[0178] In this example, the straight section 16 is a straight section 16C with an inclined surface formed on a part of the base 18.

[0179] Reference Figure 19 Provide a detailed description.

[0180] Figure 19A straight section 16C and a plurality of connecting sections 22 extending from the straight section 16C in a left-right direction are shown. Furthermore, Figure 19 A cross-sectional view of the straight section 16C and the connecting section 22 is shown, as well as an end view in a plane H orthogonal to the vertical direction, showing the portion of the connecting section 22 that is not on it.

[0181] The straight portion 16C has a base 18C and protrusions 19L and 19R.

[0182] The base 18C includes a protrusion 24 as the rear portion and a base 25 as the front portion of the protrusion 24.

[0183] The protrusion 24 is formed in a rectangular horizontal cross-section shape, and the base 25 is formed in such a way that the horizontal cross-section shape is an isosceles trapezoid shape, and the width in the left and right directions is greater than the width of the protrusion 24.

[0184] The base 25 is formed on the outer surface in the left and right directions as inclined surfaces 26, 26 approach each other as it approaches the protrusion 24.

[0185] By forming an inclined surface 26 in the straight section 16C, the angle of the corner 27 of the part where the back side of the base 25 is continuous with the inclined surface 26 is greater than a right angle, making it difficult for the corner 27 to have a notch.

[0186] Furthermore, when the straight portion 16C and the connecting portion 22 are formed during injection molding, the cross-sectional area of ​​the space formed in the continuous portion between the base portion 18C and the protrusion 19 is reduced. Specifically, when the inclined surface 26 is formed, the width t4' of the root of the protrusion 19 is shorter than the width t4 (=t2) of the root of the protrusion 19 when the inclined surface 26 is not formed.

[0187] Therefore, the molten resin PL has difficulty flowing from the base 18C of the straight portion 16C to the protrusions 19L and 19R. That is, the time required for the molten resin PL to reach the connecting portion 22 is longer, and a weld line W is more easily formed in the connecting portion 22. In addition, during the demolding process of injection molding, the molded part and the mold can be easily separated, and work efficiency can be improved.

[0188] The inclined surface 26 is only provided in the portion of the straight portion 16 that is continuous with the connecting portion 22 and in the vicinity thereon, and is not formed in the portion between adjacent connecting portions 22, such as... Figure 19 As shown in the end face view.

[0189] In addition, the protrusions 19L and 19R are formed in the part near the connecting part 22 as a wide part 28 with a wider width in the left and right direction, and the other part is a narrow part 29 with a narrower width in the left and right direction than the wide part 28.

[0190] Therefore, when the molten resin PL flows downwards, for example, during the formation of the straight section 16C, the flow rate decreases when the narrow section 29 is formed, compared to the case where the narrow section 29 is not formed. As a result, the time for the molten resin PL to flow into the wide section 28 (which is the part near the connecting section 22) is longer, and the possibility of a fusion line W forming in the connecting section 22 can be increased.

[0191] It should be noted that, such as Figure 20 As shown, in the connecting part 17, the edge of the intake and exhaust hole 13 can be formed as the connecting part 22.

[0192] Therefore, each intake and exhaust port 13 is formed by a pair of straight portions 16 and 16 adjacent to each other in the left-right direction and a pair of connecting portions 22 and 22 adjacent to each other in the up-down direction. That is, the various functions and effects described above and below also apply to the intake and exhaust port 13' formed by the pair of straight portions 16 and 16, one end of the connecting portion 17 in the up-down direction, and the connecting portion 22.

[0193] It should be noted that in the above examples, an example has been described in which the display device 1 includes a rear cover 8 in which an air intake / exhaust port 13 is formed. However, the air intake / exhaust port 13 can be formed in the rear cover, side cover, or the like in the housing of another electronic device. For example, in the case of a personal computer that includes various substrates or devices such as a motherboard and a housing arranged in the internal space, the air intake / exhaust port 13 having the above-described features can be formed on the back and side of the housing.

[0194] Furthermore, the holes formed by the straight portion and the connecting portion are not limited to air intake and exhaust holes, and this technology can be applied to various structures formed into a grid shape by injection molding in the display device 1. It should be noted that although an example in which the connecting portion 17 is formed on the outer periphery 15 of the rear cover 8 has been described above, this technology can also be applied to configurations in which the connecting portion 17 is not formed on the outer periphery 15.

[0195] <7. Summary>

[0196] As described in the examples above, when the three orthogonal directions are the first direction (vertical direction), the second direction (left-right direction), and the third direction (front-back direction), the rear cover 8 of the display device 1 includes a plurality of straight sections 16 (16A, 16B, 16C) extending in the first direction (vertical direction) and positioned separately in the second direction (left-right direction), and a connecting section 22 connecting the corresponding portions of two adjacent straight sections 16 (16A, 16B, 16C) in the second direction (left-right direction).

[0197] Furthermore, the straight portion 16 (16A, 16B, 16C) and the connecting portion 22 are integrally formed by injection molding. The straight portion 16 (16A, 16B, 16C) has a base 18 (18C) extending in a first direction (vertical direction) and a pair of protrusions 19 (19L, 19R) protruding from the two ends of the base 18 (18C) in a second direction (left-right direction) in a third direction (front-back direction). The two ends of the connecting portion 22 are continuous with the corresponding top ends 20 of the protrusions 19 (19L, 19R) of the two adjacent straight portions 16 (16A, 16B, 16C).

[0198] Therefore, holes (vacuum / vent holes 13) are formed between the straight portions 16 (16A, 16B, 16C). Furthermore, the flow rate of molten resin PL during injection molding when forming the base portion 18 (18C) is higher than the flow rate of molten resin PL during forming the connecting portion 22. Therefore, the convergence point (weld line W) of the molten resin PL divided by the holes (vacuum / vent holes 13) is easily formed in the connecting portion 22.

[0199] Since the fusion line W is formed in the connection part 22, the strength of the base 18 (18C) can be improved.

[0200] Furthermore, because the serrated shape (bellows shape) formed by alternating U-shaped cross-sections in the continuous portions of the straight sections 16 (16A, 16B, 16C) and the connecting section 22 reduces the likelihood of tensile stress in the connecting section 22 and prevents cracking and breakage when an impact is applied to the base 18 (18C). Therefore, the number of rear covers 8 that fail the impact test is reduced, and no countermeasures are required.

[0201] It should be noted that the effects described in this manual are merely illustrative and not limited, and other effects may be provided.

[0202] Furthermore, the above examples can be combined in any way, as long as the combination is not impossible.

[0203] <8. This technology>

[0204] This technology can also be configured as follows. (1)

[0206] A display device, comprising:

[0207] Multiple straight sections, when the three directions orthogonal to each other are a first direction, a second direction, and a third direction, extend in the first direction and are positioned separately from each other in the second direction; and

[0208] A connecting portion, which connects the corresponding parts of two adjacent straight sections in the second direction;

[0209] The straight section and the connecting section are integrally formed by injection molding;

[0210] The straight portion has a base extending in a first direction and a pair of protrusions projecting upwards from two ends of the base in a second direction; and

[0211] The two ends of the connecting part are continuous with the corresponding front ends of the protrusions of the two adjacent straight parts. (2)

[0213] According to the display device described in (1),

[0214] Among them, multiple connecting parts are arranged separately from each other in the first direction. (3)

[0216] According to the display device described in (2),

[0217] Wherein, the pitch width a of the connecting parts adjacent to each other in the first direction, the length b of the connecting parts in the second direction, the thickness t1 of the base in the third direction, and the thickness t2 of the connecting parts in the third direction satisfy the following formula:

[0218] (t1 / t2) 3 >a / b (4)

[0220] According to the display device described in (3),

[0221] In this case, the pitch width 'a' is greater than the length 'b'. (5)

[0223] The display device according to any one of (3) to (4),

[0224] Among them, the thickness t1 is greater than the thickness t2. (6)

[0226] The display device according to any one of (3) to (5),

[0227] The thickness t1 is greater than the thickness t3 of the protrusion in the second direction. (7)

[0229] According to the display device described in (6),

[0230] In this case, thickness t2 and thickness t3 are the same thickness. (8)

[0232] The display device according to any one of (1) to (7),

[0233] In this embodiment, at least a portion of the outer surfaces on both sides of the straight portion in the second direction are formed as inclined surfaces, and the inclined surfaces approach each other in the second direction as the distance from the connecting portion in the third direction increases. (9)

[0235] The display device according to any one of (1) to (8) further comprises:

[0236] The back cover is located behind the display panel;

[0237] The straight section and the connecting section are located in the back cover. (10)

[0239] According to the display device described in (9),

[0240] The base is located on the outer surface of the connecting part. (11)

[0242] The display device according to any one of (3) to (7),

[0243] The space surrounded by adjacent straight sections and connecting sections adjacent to each other in the first direction is formed as an intake and exhaust port.

[0244] Symbol Explanation

[0245] 1 Display device

[0246] 8. Back cover

[0247] 13, 13' intake and exhaust ports

[0248] 16, 16A, 16B, 16C Straight Section

[0249] 18, 18C base

[0250] 19, 19L, 19R protrusions

[0251] 20 Front end

[0252] 21 Outer surface

[0253] 22 Connecting parts

[0254] 26 Inclined surface

[0255] a. Pitch width;

[0256] b Length

[0257] Thicknesses t1, t2, and t3.

Claims

1. A display device, comprising: Display panel; as well as A housing surrounding the rear surface of the display panel, the sides of the display panel, and the front peripheral edge of the display panel, the housing including a rear cover facing the rear surface of the display panel. The rear cover includes: Multiple spaced-apart parallel straight sections extend in a first direction parallel to the front plane of the display panel. Each straight section has a rear surface and rounded corners at both ends extending along the first direction. Multiple connecting portions extend in the first direction, the connecting portions being connected to adjacent straight portions among the straight portions, the connecting portions being positioned at a depth inward toward the display panel relative to the rear surface of the adjacent straight portions.

2. The display device according to claim 1, in, The straight portion and the connecting portion are integrally formed by injection molding.

3. The display device according to claim 1, wherein, The back cover has two outer peripheral portions that support the straight portion. The two outer peripheral portions are oriented in a first direction and separated from each other in a second direction. The second direction is perpendicular to the first direction and forms a plane parallel to the front plane of the display panel.

4. The display device according to claim 1, wherein, There are multiple connecting portions that connect each pair of adjacent straight sections.

5. The display device according to claim 4, wherein, The plurality of connecting portions between a pair of adjacent straight portions have a pitch width a and a thickness t2 in the first direction, and the connecting portion in the pair of connecting portions has a length b and a thickness t1 in the second direction, the second direction being perpendicular to the first direction and forming a plane parallel to the front plane of the display panel with the first direction, wherein the following expression is satisfied: (t1 / t2) 3 >a / b。 6. The display device according to claim 5, wherein, The pitch width a is greater than the length b.

7. The display device according to claim 5, wherein, The thickness t1 is greater than the thickness t2.

8. The display device according to claim 5, wherein, Each of the adjacent straight sections has a concave square notch on the inner side of the straight section extending in the first direction, wherein each of the adjacent straight sections has two opposing walls forming the concave square notch, such that the two opposing walls have a thickness t3.

9. The display device according to claim 8, wherein, The thickness t1 is greater than the thickness t3 of the protrusion in the second direction.

10. The display device according to claim 8, wherein, The thickness t2 and the thickness t3 are the same.

11. The display device according to claim 1, wherein, The space surrounded by the adjacent straight portions of the straight portion and the connecting portions adjacent to each other in the first direction is formed as an intake and exhaust port.

12. The display device according to claim 1, wherein, The rear cover includes a series of vents.

13. The display device according to claim 1, wherein, The housing includes a frame that surrounds the display panel and is positioned in front of the back cover.

14. The display device according to claim 13, wherein, The frame includes a second vent.

15. The display device according to claim 12, further comprising an electronic substrate that generates heat, wherein, The electronic substrate is located between the display panel and the back cover, and the heat is discharged through the vent.

16. The display device of claim 14, further comprising an electronic substrate that generates heat, wherein, The electronic substrate is located between the display panel and the back cover, and the heat is discharged through the exhaust port and the second exhaust port.

17. The display device according to claim 1, wherein, Each of the adjacent straight sections has a concave square notch on the inner side of the straight section extending in the first direction, wherein each of the adjacent straight sections has two opposing walls forming the concave square notch, such that each bottom corner of the opposing walls is rounded.

18. The display device according to claim 14, wherein, The second exhaust port is elongated and divided into at least two groups, wherein each group includes a plurality of second exhaust ports that are parallel to each other.

19. The display device according to claim 1, wherein, The back cover is formed from molten resin.

20. The display device according to claim 13, wherein, The border forms a continuous frame shape.

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