CN110706593A - Support structure and foldable display device - Google Patents

Abstract

The invention discloses a support structure and a foldable display device, wherein the support structure is used to support a flexible display screen, and includes a first support member, a second support member, a connecting component and a bendable support member; a first support member and a second support member The support is connected in rotation through the connecting assembly, the first support and the second support can be folded between the unfolded state and the folded state; the bendable support is located between the first support and the second support, and is connected with the Component connection. The present invention utilizes the first support member, the bendable support member and the second support member of the support structure to form a support plane composed of a first support surface, a third support surface and a second support surface. The display part and the bending display part are respectively effectively supported, thereby improving the overall use sensitivity and impact resistance of the flexible display.

Description

Support structure and foldable display device

technical field

The invention relates to the field of folding screens, in particular to a support structure and a foldable display device.

Background technique

At present, flagship mobile phones of mainstream manufacturers tend to have large-screen designs, but large-screen mobile phones have great disadvantages compared to small-screen mobile phones in terms of grip comfort and portability.

In order to meet the needs of users for large-screen displays and improve the convenience of carrying the display device, foldable mobile phones utilizing the bendable characteristics of flexible displays are gradually being commercialized. Foldable mobile phones can be used in different applications due to their flexible display panels. The feature of flexible folding to change the size in the scene is becoming the main direction of next-generation mobile phone development by mainstream equipment manufacturers. In a folding mobile phone, fully and effectively supporting the flexible display screen so that the flexible display screen has a better user experience is an important indicator for improving the quality of the folding mobile phone.

At present, some foldable mobile phones are only provided with a support structure for supporting the non-bending part of the flexible display screen, and no support structure is provided for supporting the bending part of the flexible display screen. Therefore, the bent part is not effectively supported, and problems such as depression and failure are prone to occur when it is touched, and the user experience is poor.

SUMMARY OF THE INVENTION

The main purpose of the present invention is to provide a support structure, which aims to solve the problem that the bending part of the flexible display screen in the prior art foldable display device is prone to touch depression and failure due to lack of effective support.

In order to achieve the above object, the present invention provides a support structure for supporting a flexible display screen, the support structure includes a first support member, a second support member, a connecting component and a bendable support member;

The first support member and the second support member are rotatably connected through the connecting assembly, and the first support member and the second support member can be folded between the unfolded state and the folded state; the bendable support member is located between the first support member and the second support member between parts and connected with connecting components;

The first support member has a first support surface, the second support member has a second support surface, and the bendable support member has a third support surface; when the first support member and the second support member are in the unfolded state, the first support surface , The second support surface and the third support surface face the same and are flush with each other; when the first support member and the second support member are in the folded state, the first support surface and the second support surface are opposite to each other, and the third support surface is bent .

Preferably, the connecting assembly comprises a first connecting piece, a second connecting piece, a third connecting piece, a fourth connecting piece and a fifth connecting piece which are connected in sequence; On one side, the fifth connector is arranged on the side of the second support away from the second support surface, and the second connector, the third connector and the fourth connector are all located on the side of the bendable support away from the third support surface. side.

Preferably, the bendable support member includes a first support plate connected with the second connection member, a second support plate connected with the third connection member, and a third support plate connected with the fourth connection member.

Preferably, the third connecting member is provided with a first arc-shaped guide groove and a second arc-shaped guide groove which are arranged opposite to each other and the bending directions are both facing the third support surface; the first connecting member is provided with a first arc-shaped guide groove The third arc-shaped guide groove is arranged opposite to the grooves, the fifth connecting piece is provided with a fourth arc-shaped guide groove opposite to the second arc-shaped guide groove, the first arc-shaped guide groove, the second arc-shaped guide groove, the third arc-shaped guide groove The three arc-shaped guide grooves and the fourth arc-shaped guide groove are located in the relative rotation plane of the first support member and the second support member;

Two ends of the second connecting piece are respectively matched with the first arc-shaped guide groove and the third arc-shaped guide groove for sliding connection, and the two ends of the fourth connecting piece are respectively matched with the second arc-shaped guide groove and the fourth arc-shaped guide groove. Mate for a sliding connection.

Preferably, the second connecting piece includes a first fixing base and two first rotating shafts disposed at both ends of the first fixing base, the two first rotating shafts are respectively penetrated in the first arc-shaped guide groove and the third arc-shaped guide groove, and the two There is an escape space between the first rotating shaft for the first connecting piece and the third connecting piece to be inserted at the same time; They are respectively penetrated in the second arc guide groove and the fourth arc guide groove, and an escape space for the second connecting piece and the fourth connecting piece to be inserted at the same time is arranged between the two second rotating shafts.

Preferably, the inner walls of the first arc-shaped guide groove, the second arc-shaped guide groove, the third arc-shaped guide groove and the fourth arc-shaped guide groove are all provided with racks, and the first rotating shaft and the second rotating shaft are provided with Gears that match the racks.

Preferably, a first limiting block is provided on the side of the third connecting member away from the third supporting surface, and a second limiting block is provided on the side of the first fixing base and the second fixing base which is away from the third supporting surface, When the first support member and the second support member are in the folded state, the two second limit blocks abut against the first limit block.

Preferably, the first connecting member and the fifth connecting member are respectively provided with third limiting blocks. When the first supporting member and the second supporting member are in the folded state, the two third limiting blocks are respectively connected to the two second limiting blocks. block abutment.

Preferably, the number of the connecting assemblies is multiple, and the multiple connecting assemblies are arranged at intervals along the length direction of the bendable support.

The present invention also provides a foldable display device, the foldable display includes a flexible display screen and a support structure according to any of the above, the flexible display screen is covered on the first support surface, the second support surface and the third support surface.

The beneficial effects of the present application are: the support structure of the present invention utilizes a combination of a first support member, a second support member and a bendable support member to form inner and outer sides, wherein the outer side is the supporting surface of the flexible display screen, supported by the first The flat display part of the flexible display screen is supported by the first supporting surface and the second supporting surface, and the curved display part is supported by the third supporting surface, so that the supporting structure not only It supports the flat display part of the flexible display, and also effectively supports the bending display part of the flexible display, so that when the user touches the bending display part, the flexible display is supported and avoids dents , failure and other problems, the support structure improves the overall impact resistance of the flexible display screen to a certain extent.

Description of drawings

FIG. 1 is a schematic structural diagram of the foldable display device of the present invention in an unfolded state;

2 is a schematic structural diagram of the foldable display device of the present invention in a folded state;

Fig. 3 is the partial structure schematic diagram of the support structure of the present invention;

Fig. 4 is a partial structural schematic diagram of the support structure of the present invention from a viewing angle;

FIG. 5 is a partial structural schematic diagram of the support structure of the present invention from a viewing angle;

FIG. 6 is a schematic structural diagram of the second connector shown in FIG. 3;

FIG. 7 is a schematic structural diagram of the fourth connector shown in FIG. 3 .

Detailed ways

Embodiments of the present invention will be described in detail below, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to like elements or elements having the same function throughout. The embodiments described below with reference to the accompanying drawings are exemplary, and are intended to be used to explain the present invention, but should not be construed as a limitation of the present invention. Based on the embodiments of the present invention, those of ordinary skill in the art will not make any creative work. All other embodiments obtained under the premise belong to the protection scope of the present invention.

The present invention proposes a support structure 1 for supporting a flexible display screen 2. As shown in Figures 1-3, the support structure 1 includes a first support member 11, a second support member 12, a connecting component 13 and a bendable support member 14;

The first support 11 and the second support 12 are rotatably connected through the connecting assembly 13, and the first support 11 and the second support 12 can be folded between the unfolded state and the folded state; the bendable support 14 is located in the first between the support member 11 and the second support member 12, and connected with the connection assembly 13;

The first support member 11 has a first support surface 111, the second support member 12 has a second support surface 121, and the bendable support member 14 has a third support surface 141; when the first support member 11 and the second support member 12 are in the In the unfolded state, the first support surface 111 , the second support surface 121 and the third support surface 141 face the same and are flush with each other; when the first support member 11 and the second support member 12 are in the folded state, the first support surface 111 Opposite to the second support surface 121, the third support surface 141 is bent.

In this embodiment, the support structure 1 has inner and outer sides, wherein the outer side serves as the support surface of the flexible display screen 2, and is composed of the first support surface 111, the third support surface 141 and the second support surface 121 arranged in sequence. The flat display part of the screen 2 is supported by the first support surface 111 and the second support surface 121, and the curved display part is supported by the third support surface 141, so that the support structure 1 not only supports the flat display part of the flexible display screen 2 It also effectively supports the bending display part of the flexible display screen 2, so that when the user performs a touch operation on the bending display part, the flexible display screen is supported to avoid problems such as depression and failure. The support structure 1 improves the The overall impact resistance of the flexible display screen 2 is improved. The inner side of the support structure 1 is the side where the first support 11 , the second support 12 and the bendable support 14 are connected to the connecting assembly 13 .

There are various implementation forms of the bendable support member 14, for example, it is made of a bending-resistant elastic material, such as TPEE material, or a multi-segment structure in series. In this example, the connecting component 13 remains connected to the bendable support 14 to maintain the support for the bendable support 14 during the relative folding of the first support 11 and the second support 12, so that the third support The surface 141 continues to provide effective support for the flexible display screen 2 . The connecting assembly 13 can adopt various structures, such as a hinge structure. The hinge includes a middle fixing portion and a telescopic rod hinged with the middle fixing portion. A supporting member 11 is connected to the second supporting member 12. When the first supporting member 11 and the second supporting member 12 are folded relative to each other, the two telescopic rods are rotated in the middle fixing portion and the length is shortened, so that the first supporting member 14 can be bent. The areas of the three supporting surfaces 141 remain unchanged to avoid pulling the flexible display screen 2 . The connecting assembly 13 may also adopt a sliding connection to achieve relative rotation. For example, the connecting assembly 13 includes a first member, a second member and a The third member, wherein the second member is provided with two arc-shaped guide grooves facing the direction of the first member and the third member respectively, the first member and the third member are respectively provided with their corresponding arc-shaped guide grooves to cooperate with the arc-shaped guide grooves For the arc-shaped arm sliding in the slot, during the relative folding process of the first support member 11 and the second support member 12, the two arc-shaped arms penetrate into the two arc-shaped guide grooves and slide with the folding action. The connecting assembly 13 may also adopt a ball chain structure connected in series, for example, three ball chains corresponding to the first supporting member 11, the bendable supporting member 14 and the second supporting member 12, respectively, and the adjacent two ball chains are arranged between them. There is a space between them, and they are connected by connecting rods that can be telescopic or retractable relative to the two ball chains. The two connecting rods can also be relative to the middle in the folding plane (that is, the rotation plane in which the first support 11 is folded relative to the second support 12). When the ball chain rotates, when the first support 11 and the second support 12 are folded with each other, the two connecting rods rotate and shorten relative to the middle ball chain, and the two ball chains on both sides approach and rotate relative to each other.

As shown in FIG. 3 and FIG. 4 , the connecting assembly 13 may also adopt the first connecting piece 131 , the second connecting piece 132 , the third connecting piece 133 , the fourth connecting piece 134 and the fifth connecting piece 135 , which are connected in sequence; The connecting member 131 is arranged on the side of the first supporting member 11 away from the first supporting surface 111 , and the fifth connecting member 135 is arranged on the side of the second supporting member 12 away from the second supporting surface 121 . Both the three connecting pieces 133 and the fourth connecting piece 134 are located on the side of the bendable support piece 14 away from the third support surface 141 .

The bendable support member 14 can be made of elastic material, when the second connecting member 132 , the third connecting member 133 and the fourth connecting member 134 rotate with each other, and the three are opposite to the first connecting member 131 and the fifth connecting member 135 During the rotation process, the bendable support member 14 is bent along with it; or a multi-segment structure is adopted, for example, the bendable support member 14 includes a first support plate 142 connected with the second connection member 132 and connected with the third connection member 133 The second support plate 143 and the third support plate 144 connected with the fourth connecting piece 134 .

In this example, the bendable support member 14 is preferably a multi-segment structure. The flexible display screen 2 on the third supporting surface 141 is supported on the third supporting surface 141 , respectively, under the supporting action of each of them being kept outward.

In a preferred embodiment, as shown in FIGS. 3-5 , the third connecting member 133 is provided with a first arc-shaped guide groove 1331 and a second arc-shaped guide groove 1331 and a second arc-shaped guide groove 1331 and a second arc-shaped guide groove 1331 , which are away from each other and are both bent toward the third support surface 141 . Guide groove 1332; the first arc guide groove 1331 and the second arc guide groove 1332 are in the shape of an annular shape less than or equal to a quarter circle, and the inner and outer diameters of the first arc guide groove 1331 and the second arc guide groove 1332 are equal to each other. Equivalent, it can be in the form of through-slots or non-through-slots. The first connecting member 131 is provided with a third arc-shaped guide groove 1311 opposite to the first arc-shaped guide groove 1331 , and the fifth connecting member 135 is provided with a fourth arc-shaped guide groove 1332 opposite to the second arc-shaped guide groove 1332 . The guide groove 1351 , the first arc guide groove 1331 , the second arc guide groove 1332 , the third arc guide groove 1311 and the fourth arc guide groove 1351 are located opposite the first support member 11 and the second support member 12 . In the rotation plane (the rotation plane is perpendicular to the first support surface 111 and the second support surface 121 ), the structures of two adjacent arc guide grooves are symmetrical to each other.

Both ends of the second connecting member 132 are respectively matched with the first arc-shaped guide groove 1331 and the third arc-shaped guide groove 1311 to be slidably connected. Four arc-shaped guide grooves 1351 are matched for sliding connection. When the first supporting member 11 and the second supporting member 12 are folded relative to each other, both ends of the second connecting member 132 slide in the first arc-shaped guide groove 1331 and the third arc-shaped guiding groove 1311 respectively, and the second connecting member 132 is opposite to each other. The third connecting piece 133 rotates with the first arc-shaped guide groove 1331 as the rotational trajectory, and at the same time the first connecting piece 131 rotates relative to the second connecting piece 132 with the third arc-shaped guide groove 1311 as the rotational locus, so the first connecting piece The relative positions of 131 and the third connecting piece 133 approach and rotate relative to each other. The fixed second support plate 143 is rotated. Similarly, during the relative folding process of the first support member 11 and the second support member 12, both ends of the fourth connecting member 134 slide in the second arc-shaped guide groove 1332 and the fourth arc-shaped guide groove 1351 respectively, and the first The fourth connecting member 134 rotates relative to the third connecting member 133 using the second arc-shaped guide groove 1332 as the rotation trajectory, while the fifth connecting member 135 rotates relative to the fourth connecting member 134 using the fourth arc-shaped guiding groove 1351 as the rotation trajectory. Therefore, the relative positions of the fifth connecting member 135 and the third connecting member 133 approach and rotate relative to each other. The second support plate 143 fixed by the third connecting member 133 rotates.

In a preferred embodiment, as shown in FIG. 5-FIG. 7, the first arc guide groove 1331, the second arc guide groove 1332, the third arc guide groove 1311 and the fourth arc guide groove 1351 adopt the slot structure. The second connecting member 132 includes a first fixing base 1321 and two first rotating shafts 1322 disposed at both ends of the first fixing base 1321, and the two first rotating shafts 1322 are respectively penetrated through the first arc-shaped guide groove 1331 and the third arc-shaped guide groove In 1311, the two first rotating shafts 1322 can roll or slide along the first arc-shaped guide grooves 1331 respectively, and their functions have two functions: one is the limiting function. The first connecting member 131 is far away from the second connecting member 132 , and the first rotating shaft 1322 passing through the first arc-shaped guide groove 1331 can prevent the first connecting member 131 from being separated from the second connecting member 132 , that is, restricting the first connecting member 131 After reaching the preset position, the continuous rotation causes the first support surface 111 and the third support surface 141 to reversely fold; the same is true for the other first rotating shaft 1322 passing through the third arc-shaped guide groove 1311; The two first rotating shafts 1322 are respectively matched with the first arc-shaped guide groove 1331 and the third arc-shaped guide groove 1311 to guide the movement trajectories of the first connecting member 131 and the second connecting member 132 . There is an escape space 1323 between the two first rotating shafts 1322 for the first connecting piece 131 and the third connecting piece 133 to be inserted at the same time. The escape space 1323 should accommodate at least the first arc guide groove 1331 and the second arc guide The grooves 1332 are the first connecting piece 131 and the third connecting piece 133 inserted into the first fixing seat 1321 when they are closest to each other.

The fourth connecting member 134 includes a second fixing base 1341 and two second rotating shafts 1342 disposed at both ends of the second fixing base 1341, and the two second rotating shafts 1342 are respectively penetrated through the second arc-shaped guide groove 1332 and the fourth arc-shaped guide groove. Inside 1351, there is an escape space 1343 between the two second rotating shafts 1342 for the second connecting piece 132 and the fourth connecting piece 134 to be inserted at the same time. The function of the second rotating shaft 1342 is the same as that of the first rotating shaft 1322 , and also plays the role of limiting and guiding the movement of the fourth connecting member 134 and the fifth connecting member 135 . The avoidance space 1343 in the second fixing seat 1341 also has the same function as the avoidance space 1323 in the first fixing seat 1321 .

In a preferred embodiment, as shown in FIG. 5, the inner walls of the first arc guide groove 1331, the second arc guide groove 1332, the third arc guide groove 1311 and the fourth arc guide groove 1351 are provided with Rack, the first rotating shaft 1322 and the second rotating shaft 1342 are both provided with gears that cooperate with the racks, and the racks and gears that cooperate with each other can connect the first connecting piece 131, the second connecting piece 132, and the fourth connecting piece 134. and the motion trajectory of the fifth connecting member 135 is further defined.

In a preferred embodiment, as shown in FIGS. 5-7 , the side of the third connecting member 133 away from the third supporting surface 141 is provided with a first limiting block 1333 , a first fixing seat 1321 and a second fixing seat 1341 The upper side away from the third support surface 141 is provided with a second limit block (1324 in FIG. 6 and 1344 in FIG. 7 ). When the first support 11 and the second support 12 are in the folded state, the two The second limiting block is in contact with the first limiting block 1333 . The first limit block 1333 and the second limit block in the abutting state can define the relative positions of the first support member 11 and the second support member 12 when they are in the folded state—mainly reflected in the folding angle, which is preferably designed as When the two second limiting blocks abut against the first limiting block 1333 , the first supporting surface 111 and the second supporting surface 121 are parallel to each other. The sizes of the first limiting block 1333 and the second limiting block can be set according to the requirements of the included angle when the first supporting member 11 and the second supporting member 12 are in the folded state.

Similarly, the first connecting member 131 and the fifth connecting member 135 are also provided with third limiting blocks (1312 and 1352 in FIG. 4 ) respectively. When the first supporting member 11 and the second supporting member 12 are in the folded state , the two third limiting blocks are respectively abutted with the two second limiting blocks. The shape of the third limit block may be determined according to the shape of the second limit block. For example, if the shape of the second limit block is a gate shape, the third limit block may be M-shaped.

In a preferred embodiment, as shown in FIG. 1 , the number of the connecting elements 13 is multiple, and the multiple connecting elements 13 are spaced and evenly arranged along the length direction of the bendable support 14 .

The length direction of the bendable support member 14 is perpendicular to the rotation plane of the relative folding of the first support member 11 and the second support member 12 , that is, perpendicular to the first support surface 111 and the second support surface 121 . The assembly 13 provides multi-point support to the first support 11 and the second support 12 in the length direction of the bendable support 14, thereby increasing the stability of the first support 11 and the second support 12 during the relative folding process . The number of connecting assemblies 13 is preferably three.

The present invention also proposes a foldable display device, as shown in FIG. 1 and FIG. 2 , the foldable display device includes a flexible display screen 2 and a support structure 1 , and the support structure 1 is the support structure 1 in any of the above embodiments. The structure 1 at least includes a first support 11 , a second support 12 , a connection assembly 13 and a bendable support 14 . The first support member 11 and the second support member 12 are rotatably connected through the connecting assembly 13, and the first support member 11 and the second support member 12 can be folded between the unfolded state and the folded state. The bendable supporting member 14 is located between the first supporting member 11 and the second supporting member 12 and is connected with the connecting component 13 . The first support 11 has a first support surface 111 , the second support 12 has a second support surface 121 , and the bendable support 14 has a third support surface 141 . When the first support 11 and the second support 12 are in the unfolded state, the first support surface 111 , the second support surface 121 and the third support surface 141 face the same and are flush with each other; when the first support 11 and the second support When the support member 12 is in the folded state, the first support surface 111 and the second support surface 121 are opposite to each other, and the bendable support member 14 is bent. The flexible display screen 2 is covered on the first support surface 111 , the second support surface 121 and the third support surface 141 .

The above are only some or preferred embodiments of the present invention, and neither the text nor the accompanying drawings can therefore limit the scope of protection of the present invention. Equivalent structural transformation, or direct/indirect application in other related technical fields are all included in the protection scope of the present invention.

Claims (10)

1. A support structure for supporting a flexible display screen, wherein the support structure comprises a first support member, a second support member, a connecting component and a bendable support member; The first support member and the second support member are rotatably connected through the connecting assembly, and the first support member and the second support member can be folded between the unfolded state and the folded state; the bendable support a piece is located between the first support piece and the second support piece, and is connected with the connection assembly; The first support member has a first support surface, the second support member has a second support surface, and the bendable support member has a third support surface; when the first support member and the second support member are in the In the unfolded state, the first support surface, the second support surface and the third support surface face the same and are flush with each other; when the first support member and the second support member are in the folded state, the first support surface It is opposite to the second support surface, and the third support surface is bent. 2 . The support structure according to claim 1 , wherein the connecting assembly comprises a first connecting piece, a second connecting piece, a third connecting piece, a fourth connecting piece and a fifth connecting piece which are connected in sequence; 3 . The first connecting piece is arranged on the side of the first supporting piece away from the first supporting surface, the fifth connecting piece is arranged on the side of the second supporting piece away from the second supporting surface, the The second connecting piece, the third connecting piece and the fourth connecting piece are all located on the side of the bendable support member away from the third support surface. 3 . The supporting structure according to claim 2 , wherein the bendable supporting member comprises a first supporting plate connected with the second connecting member, and a second supporting plate connected with the third connecting member. 4 . a plate and a third support plate connected with the fourth connector. 4 . The support structure according to claim 3 , wherein the third connecting member is provided with a first arc-shaped guide groove and a second arc-shaped guide which are away from each other and whose bending directions are both directed toward the third support surface. 5 . The first connecting piece is provided with a third arc-shaped guide groove opposite to the first arc-shaped guide groove, and the fifth connecting piece is provided with a fourth arc opposite the second arc-shaped guide groove The first arc guide groove, the second arc guide groove, the third arc guide groove and the fourth arc guide groove are located opposite the first support member and the second support member in the plane of rotation; The two ends of the second connecting piece are respectively matched with the first arc-shaped guide groove and the third arc-shaped guide groove to be slidably connected, and the two ends of the fourth connecting piece are respectively guided with the second arc-shaped guide groove. The groove cooperates with the fourth arc guide groove for sliding connection. 5 . The support structure according to claim 4 , wherein the second connecting member comprises a first fixing base and two first rotating shafts disposed at both ends of the first fixing base, and the two first rotating shafts are respectively 5 . Pass through the first arc guide groove and the third arc guide groove, and there is an escape space for the first connecting piece and the third connecting piece to be inserted between the two first rotating shafts; The four connecting pieces include a second fixing base and two second rotating shafts disposed at both ends of the second fixing base, and the two second rotating shafts respectively pass through the second arc-shaped guide groove and the fourth arc-shaped guide groove , an escape space for the insertion of the second connecting piece and the fourth connecting piece is arranged between the two second rotating shafts. 6 . The support structure according to claim 5 , wherein the inner walls of the first arc guide groove, the second arc guide groove, the third arc guide groove and the fourth arc guide groove are all provided with 6 . A rack, the first rotating shaft and the second rotating shaft are both provided with gears matched with the rack. 7 . The support structure according to claim 5 , wherein a side of the third connecting piece facing away from the third support surface is provided with a first limiting block, the first fixing seat and the second fixing The side of the seat facing away from the third support surface is provided with a second limit block. When the first support member and the second support member are in a folded state, the two second limit blocks and the first The limit block abuts. 8 . The support structure according to claim 7 , wherein the first connecting piece and the fifth connecting piece are respectively provided with a third limiting block, when the first support piece and the second support piece are in the In the folded state, the two third limiting blocks are in contact with the two second limiting blocks respectively. 9 . The support structure according to claim 1 , wherein the number of the connecting components is plural, and the plural connecting components are spaced along the length direction of the bendable support member. 10 . layout. 10. A foldable display device, comprising a flexible display screen and a support structure, the support structure being the support structure according to any one of claims 1-9, and the flexible display screen is wrapped around the the first support surface, the second support surface and the third support surface.

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