TWI862375B - Touch input device - Google Patents

Abstract

A touch input device comprises a circuit board, a plurality of illuminant elements, a spacer, a plurality of light guide plates, a shielding sheet, and a top plate. The circuit board has an upper surface and a board edge, wherein the upper surface has a plurality of sensing regions. The illuminant elements are disposed on the upper surface of the circuit board. The spacer is positioned above the circuit board and has a light-leaking edge and a plurality of accommodating holes for accommodating the illuminant elements and the light guide plate. The shielding sheet includes a main sheet section, a first extension section, and a second extension section. The main sheet section covers the spacer and has a plurality of transparent regions respectively corresponding to the light guide plates. The first extension section covers the light-leaking edge of the spacer and the board edge of the circuit board.

Description

Touch input device

The present invention relates to an input device for an electronic device, and in particular to a touch input device.

The input device of an electronic device, such as a keyboard, is for the user to press to transmit input signals to the electronic device. Common keyboards include multiple independent keys, and the types of keys may be, for example, mechanical keys, membrane switch keys, or optical induction switch keys. Mechanical keys have a more complex structure and are larger in size, and are not suitable for use in electronic devices that require higher thinness (such as laptops). Currently, the keyboards used in thin electronic devices are mainly membrane switch keys, but more and more keyboards are beginning to use optical induction switch keys as the key type of keyboards.

As the functions of thin electronic devices increase, their input devices include touch function bars in addition to keyboards. The touch function bar has multiple touch areas for users to touch and operate, allowing the electronic device to perform different functions. The commonly used touch function bar has a backlight module inside to illuminate the touch function bar. If the backlight module is poorly assembled, the touch function bar may leak light.

In view of this, an object of the present invention is to provide a touch input device that can avoid light leakage.

In order to achieve the above-mentioned object, the present invention provides a touch input device, which includes a circuit board, a plurality of light-emitting elements, a spacer, a plurality of light guides, a light shielding plate and a top plate. The circuit board has an upper surface, a lower surface and a side edge, the upper surface has a plurality of sensing areas, and the sensing areas are arranged along a long axis; the light-emitting elements are arranged on the upper surface of the circuit board and arranged along the long axis; the spacer is arranged above the upper surface of the circuit board, the spacer has a top surface, a bottom surface and a light leakage edge, and the spacer has a plurality of receiving holes, the receiving holes penetrate the top surface and the bottom surface, the receiving holes are arranged along the long axis and correspond to the sensing areas respectively, and the light leakage edge corresponds to the side edge of the circuit board; wherein the light-emitting elements protrude into the receiving holes respectively; the light guide sheets are respectively The light shielding plate comprises a main board section, a first extension section and a second extension section, wherein the main board section covers the top surface of the light shielding plate, the main board section has a plurality of light-transmitting areas, the light-transmitting areas are arranged along the long axis, and the light-transmitting areas correspond to the light guide plates respectively; the first extension section covers the light leakage edge of the spacer and the side edge of the circuit board; the second extension section is connected to the first extension section and combined with the lower surface of the circuit board; the top plate is arranged on the main board section of the light shielding plate, and the top plate has a plurality of light-emitting areas, the light-emitting areas are arranged along the long axis and correspond to the light-transmitting areas of the main board section of the light shielding plate respectively.

By covering the light-leaking edge of the spacer and the side edge of the circuit board with the first extension section of the light-shielding plate, the light of the light-emitting elements can be shielded to avoid light leakage.

The present invention further provides a touch input device, comprising a circuit board, a plurality of light-emitting elements, a reflective layer, a spacer, a plurality of light guide sheets, a light shielding plate and a top plate. The circuit board has an upper surface and a lower surface, the upper surface has a plurality of sensing areas, and the sensing areas are arranged along a long axis; the light-emitting elements are arranged on the upper surface of the circuit board and arranged along the long axis; the reflective layer includes a main reflective section, a first extension section and a second extension section, wherein the main reflective section is arranged on the upper surface of the circuit board, the main reflective section has a plurality of through holes, the through holes are arranged along the long axis, and the light-emitting elements pass through the through holes respectively; the spacer is arranged on the main reflective section of the reflective layer, the spacer has a top surface, a bottom surface and a light leakage edge, and the spacer has a plurality of accommodating holes, the accommodating holes penetrate the top surface and the bottom surface, the accommodating holes are arranged along the long axis and correspond to the light-emitting elements respectively. The sensing area and the through holes, wherein the light emitting elements protrude into the receiving holes respectively; the light guide sheets are respectively arranged in the receiving holes of the spacer; the light shielding plate covers the top surface of the spacer, the light shielding plate has a plate side and a plurality of light-transmitting areas, the plate side corresponds to the light-leaking edge of the spacer, the light-transmitting areas are arranged along the long axis, and the light-transmitting areas The top plate is arranged on the shading plate, and the top plate has a plurality of light emitting areas, which are arranged along the long axis and correspond to the light-transmitting areas of the shading plate respectively; wherein the first extension section of the reflective layer covers the light-leaking edge of the spacer and the side edge of the shading plate; the second extension section of the reflective layer is connected to the first extension section and combined with the top plate.

By covering the light-leaking edge of the spacer and the side edge of the light-shielding plate with the first extension section of the reflective layer, the light of the light-emitting elements can be shielded to avoid light leakage.

In order to explain the present invention more clearly, a preferred embodiment is given and described in detail with reference to the drawings. Please refer to FIG. 1 to FIG. 5 , which are a touch input device 1 of a first preferred embodiment of the present invention. In this embodiment, the touch input device 1 is long. For the convenience of explanation, a long axis X, a short axis Y and a stacking axis Z are defined perpendicular to each other. The touch input device 1 includes a circuit board 10, a plurality of light-emitting elements 22, a spacer 24, a plurality of light guide sheets 34, a light shielding plate 36 and a top plate 50.

The circuit board 10 has an upper surface 102, a lower surface 104 and a board side 106. In this embodiment, the circuit board 10 has two long sides 10a, 10b and two short sides 10c, 10d. The two long sides 10a, 10b are opposite to each other in the short axis direction Y, and each of the long sides 10a, 10b extends along the long axis direction X; the two short sides 10c, 10d are opposite to each other in the long axis direction X, and each of the short sides 10c, 10d extends along the short axis direction Y. The upper surface 102 has a plurality of sensing areas 12, which are arranged along the long axis direction X, and the sensing areas 12 are connected to a sensing circuit 14. Each of the sensing areas is used to sense a touch operation of a user to generate a corresponding touch signal. The lower surface 104 is provided with a reading element 18 and a light source driving element 20. The reading element 18 is electrically connected to the sensing regions 12 through the sensing circuit 14 to obtain the touch signals generated by the sensing regions 12.

The light-emitting elements 22 are disposed on the upper surface 102 of the circuit board 10 and arranged along the long axis X. The light-emitting elements 22 are electrically connected to the light-source driving element 20 through a light-source line 16 on the upper surface 102 of the circuit board 10. The light-source driving element 20 drives each of the light-emitting elements 22 to emit light through the light-source line 16. In this embodiment, in the short axis Y, each of the light-emitting elements 22 is located on one side of each of the sensing regions 12. Each of the light-emitting elements 22 is a light-emitting diode and has a side light-emitting surface 222. Each of the side light-emitting surfaces 222 faces each of the sensing regions 12 upward along the short axis. More specifically, each of the light emitting elements 22 is located between each of the sensing regions 12 and one of the long sides 10b of the circuit board 10, and the other long side 10a is farther from the light emitting elements 22. The long side 10b closer to the light emitting elements 22 of the two long sides 10a, 10b of the circuit board 10 constitutes the board side 106.

In this embodiment, the touch input device 1 may optionally include a reflective layer 60, and the reflective layer 60 is disposed on the upper surface 102 of the circuit board 10. The reflective layer 60 is disposed on the upper surface 102 of the circuit board 10 along the stacking axis Z. The reflective layer 60 is, for example, a reflective plate and is disposed on the upper surface 102 of the circuit board 10 in an adhesive manner, but is not limited thereto, and may also be a reflective coating, and the reflective coating is coated on the upper surface 102 of the circuit board 10. The reflective layer 60 has a plurality of openings 602 and a plurality of through holes 604. The openings 602 are arranged along the long axis X and correspond to the sensing regions 12 of the circuit board 10 respectively. Each of the sensing regions 12 is located within the range of each of the openings 602 in the stacking axis Z. The through holes 604 are arranged along the long axis X and the light-emitting elements 22 pass through the through holes 604 respectively. The reflective layer 60 has an upper reflective surface 60a, and the upper reflective surface 60a faces away from the circuit board 10. In one embodiment, the reflective layer 60 may not be provided with the openings 602, so that the sensing regions 12 of the circuit board 10 are covered by the reflective layer 60. Each of the sensing regions 12 can also sense the touch operation of the user.

The spacer 24 is disposed above the upper surface 102 of the circuit board 10 along the stacking axis Z. The spacer 24 has a top surface 242, a bottom surface, and a light leakage edge. In this embodiment, the spacer 24 is disposed on the reflective layer 60 along the stacking axis Z, for example, by gluing the spacer 24 on the upper reflective surface 60a of the reflective layer 60, so that the reflective layer 60 is disposed between the upper surface of the circuit board 10 and the bottom surface 244 of the spacer 24. The spacer 24 has a plurality of receiving holes 26, which penetrate the top surface 242 and the bottom surface 244. The receiving holes 26 are arranged along the long axis X and correspond to the openings 602 and the through holes 604 of the reflective layer 60, and the sensing areas 12 of the circuit board 10, respectively. A spacer rib 28 is formed between two adjacent receiving holes 26, that is, each spacer rib 28 isolates two adjacent receiving holes 26.

In this embodiment, the spacer 24 has a first spacer section 30 and a second spacer section 32 in the short axis direction Y. The first spacer section 30 has the receiving holes 26. The light emitting elements 22 protrude into the receiving holes 26. In the short axis direction Y, the length of the first spacer section 30 is greater than the length of the second spacer section 32. The spacer 24 has two opposite long sides 24a and 24b in the short axis direction Y. Each of the long sides 24a and 24b extends along the long axis direction X. One of the long sides 24a is located in the first spacing section 30, and the other long side 24b is located in the second spacing section 32. The long side 24b of the two long sides 24a and 24b that is closer to the light-emitting elements 22 (i.e., the long side 24b of the second spacing section) constitutes the light leakage edge 246. The light leakage edge 246 of the spacer 24 corresponds to the board side 106 of the circuit board 10, and in the stacking axis direction Z, the light leakage edge 246 is located above the board side 106 of the circuit board 10.

In this embodiment, each opening 602 and each through hole 604 of the reflective layer 60 are located within the range of each receiving hole 26 in the stacking axis Z. In one embodiment, the reflective layer 60 may not be provided, and the spacer 24 may be directly provided on the circuit board 10, and the bottom surface 244 of the spacer 24 directly faces the upper surface 102 of the circuit board 10.

The light guide plates 34 are respectively disposed in the receiving holes 26 of the spacer 24, and the side light emitting surface 222 of each light emitting element 22 faces each light guide plate 34. Each light guide plate 34 has a receiving portion. In the present embodiment, each receiving portion is exemplified by a notch 342, but is not limited thereto and may also be a structure such as a groove or a perforation. Each notch 342 is formed by being recessed from one side of each light guide plate 34. Each light emitting element 22 protrudes into the notch 342 of each light guide plate 34. Each notch 342 surrounds the side light emitting surface 222 of each light emitting element 22, and the side light emitting surface 222 of each light emitting element 22 faces the wall surface of the notch 342 of each light guide plate 34. The notch 342 has a long light-entering edge 342a and two short light-entering edges 342b. The long light-entering edge 342a is opposite to the side light-emitting surface 222 of the light-emitting element 22 on the short axis Y, and the two short light-entering edges 342b are located on opposite sides of the side light-emitting surface 222 of the light-emitting element 22 on the long axis X. Thus, the light emitted from the side light-emitting surface 222 of the light-emitting element 22 can mainly enter the light guide plate 34 through the long light-entering edge 342a; the light emitted to the sides from the side light-emitting surface 222 can enter the light guide plate 34 through the two short light-entering edges 342b, thereby increasing the amount of light entering the light guide plate 34.

In one embodiment, each light emitting element 22 may be located on one side of the light guide plate 34 , and each light guide plate 34 may not be provided with a receiving portion, so that the light emitted from the side light emitting surface 222 of each light emitting element 22 enters the light guide plate 34 from the side of each light guide plate 34 .

The light shielding plate 36 includes a main plate section 38, a first extension section 40 and a second extension section 42. The main plate section 38 covers the top surface 242 of the spacer 24, and is disposed on the top surface 242 of the spacer 24 by adhesive, for example. The main plate section 38 confines the light guide sheets 34 in the receiving holes 26 of the spacer 24. The main plate section 38 has a plurality of light-transmitting areas 382, which are arranged along the long axis X and correspond to the light guide sheets 34 respectively. Each of the light guide sheets 34 is located below each of the light-transmitting areas 382 in the stacking axis Z.

The first extension section 40 covers the light leakage edge 246 of the spacer 24 and the board side edge of the circuit board 10, and the second extension section 42 is connected to the first extension section 40 and combined with the lower surface 104 of the circuit board 10, for example, the second extension section 42 is combined with the lower surface 104 of the circuit board 10 in an adhesive manner. The first extension section 40 can be combined with the light leakage edge 246 of the spacer 24 and the board side edge 106 of the circuit board in an adhesive manner, alternatively, the first extension section 40 may not be combined with the light leakage edge 246 of the spacer 24 and the board side edge 106 of the circuit board 10. In more detail, the first extension section 40 is connected to a side of the main board section 38 close to the light leakage edge 246 of the spacer 24, and the first extension section 40 extends downward along the stacking axis Z to further cover the edge of the reflective layer 60. The second extension section 42 extends along the short axis Y and at least extends to the lower surface 104 of the circuit board 10 and is located directly below the second spacer section 32 of the spacer 24 to prevent the second extension section 42 from rising relative to the lower surface 104 of the circuit board 10. In this embodiment, the end of the second extension section 42 extends in the short axis Y to below the hole wall 26a of the accommodating hole 26, and does not extend to directly below the light-emitting element 22.

In this embodiment, the light shielding plate 36 includes a transparent substrate 44 and at least one light shielding layer. The at least one light shielding layer is disposed on the transparent substrate 44. The at least one light shielding layer and the light emitting elements overlap in the stacking axis Z. In this embodiment, the at least one light shielding layer is two layers, namely a reflective layer 46 and a light absorbing layer 48. An inner surface 442 of the transparent substrate 44 is used to combine the light shielding plate 36 and the circuit board 10. The reflective layer 46 can be, for example, white paint applied on an outer surface 444 of the transparent substrate 44. The light absorbing layer 48 can be, for example, black paint applied on the outer side of the reflective layer 46, and the edges of the reflective layer 46 are all covered by the light absorbing layer 48. On the main board segment 38, the light absorbing layer 48 has a plurality of hollow areas 482, and each hollow area 482 and the transparent substrate 44 thereunder constitute each light-transmitting area 382. In one embodiment, the at least one light shielding layer may be a single layer, for example, only the reflective layer 46 or the light absorbing layer 48 is provided.

The top plate 50 is disposed on the main board section of the light shielding plate 36. The top plate 50 has a plurality of light emitting areas 502. Each of the light emitting areas 502 can be, for example, a character. The light emitting areas 502 are arranged along the long axis X and correspond to the light-transmitting areas 382 of the main board section 38 of the light shielding plate 36, respectively. Each of the light emitting areas 502 of the top plate 50, each of the light-transmitting areas 382 of the main board section 38 of the light shielding plate 36, and each of the sensing areas 12 on the circuit board 10 overlap in the stacking axis Z. In this embodiment, the top plate 50 includes a transparent plate 52 and a bottom layer 54. The transparent plate 52 can be, for example, a glass plate. The front of the transparent plate 52 is an operating surface 522 for the user to touch. The bottom layer 54 can be, for example, a primer with a light shielding effect printed on the back of the transparent plate 52, thereby printing the shape of each light-transmitting area 382. The bottom layer 54 can be, for example, set on the main plate section 38 of the light shielding plate 36 in an adhesive manner. The top plate 50 has a plate edge 504, which extends along the long axis direction X and is adjacent to the first extension section 40 of the light shielding plate 36.

Light emitted by each light-emitting element 22 enters each light-guiding sheet 34, and then passes through each light-transmitting area 382 of the light-shielding plate 36 and each light-emitting area 502 of the top plate 50 to pass through the operation surface 522. The user can touch a position on the operation surface 522 of the top plate 50 corresponding to any light-emitting area 502, and the sensing area 12 of the circuit board 10 below the touched light-emitting area 502 can sense the user's touch operation. Since the light-leaking edge 246 of the spacer 24 is covered by the first extension section 40 of the light-shielding plate 36, light leakage can be prevented. The user will not see light passing through the board edge 504 of the top plate 50. In addition, since each of the light guide plates 34 is located in each of the receiving holes 26 of the spacer 24, the adjacent receiving holes 26 are isolated by the spacer ribs 28 of the spacer 24. Therefore, the light transmitted through the light guide plates 34 in each of the receiving holes 26 will not enter the adjacent receiving holes 26 and affect the light transmitted through the adjacent light output area 502.

FIG6 shows a touch input device 2 of a second preferred embodiment of the present invention, which has a structure substantially similar to that of the first embodiment, except that the second extension section 42 of the light shielding plate 36 extends to the lower surface 104 of the circuit board 10 and is located directly below the light emitting elements 22. Compared with the first embodiment, the second extension section 42 of the present embodiment has a larger bonding area with the lower surface 104 of the circuit board 10, and the chance of the second extension section 42 protruding relative to the lower surface 104 of the circuit board 10 can be reduced.

FIG. 7 shows a touch input device 3 of a third preferred embodiment of the present invention, which has a structure substantially the same as that of the second embodiment, except that the second extension section 42 of the light shielding plate 36 extends to the lower surface of the circuit board 10 and is located directly below the sensing areas 12. The second extension section 42 of this embodiment has a larger bonding area with the lower surface 104 of the circuit board 10, so the bonding strength is stronger, and the second extension section 42 is less likely to rise relative to the lower surface 104 of the circuit board 10.

In addition, the second extension section 42 of the light shielding plate 36 of this embodiment can be selectively provided with a plurality of heat dissipation holes 422, which are arranged along the long axis X and are respectively located directly below the light emitting elements 22. Thus, the heat dissipated by each light emitting element 22 can be conducted to the circuit board 10 and out through each heat dissipation hole 422.

FIG. 8 and FIG. 9 show a touch input device 4 of a fourth preferred embodiment of the present invention, which has a structure substantially the same as that of the first embodiment, except that:

The reflective layer 60 of this embodiment includes a main reflective section 62, a first extension section 64 and a second extension section 66. The main reflective section 62 is disposed on the upper surface 102 of the circuit board 10. The main reflective section 62 has the openings 602 and the through holes 604. The first extension section 64 is connected to the main reflective section 62. The first extension section 64 extends upward along the stacking axis Z. The second extension section 66 of the reflective layer 60 is connected to the first extension section 64 and is combined with the top plate 50. More specifically, the second extension section 66 is combined with the bottom of the top plate 50, for example, by adhesively combining with the bottom layer 54 of the top plate 50. In one embodiment, the main reflective section 62 may not be provided with the openings 602.

The spacer 24 is disposed on the main reflective section 62 of the reflective layer 60, for example, by gluing it on the upper reflective surface 60a of the main reflective section 62. Each of the light-emitting elements 22 is located between each of the sensing regions 12 of the circuit board 10 and the light-leaking edge 246 of the spacer 24 in the short axis direction Y.

The light shielding plate 36 is composed of the main plate segment 38, and the first extension segment 40 and the second extension segment 42 as in the first embodiment are not provided. The light shielding plate 36 has a plate side edge 36a, and the plate side edge 36a corresponds to the light leakage edge 246 of the spacer 24, that is, the plate side edge 36a is located above the light leakage edge 246 in the stacking axis Z. In this embodiment, the transparent substrate 44 is not covered by the light absorption layer 48 at the plate side edge 36a. The first extension segment 64 of the reflective layer 60 covers the light leakage edge 246 of the spacer 24 and the plate side edge 36a of the light shielding plate 36.

Since the light leakage edge 246 of the spacer 24 and the plate side edge 36a of the light shielding plate 36 are covered by the first extension section 64 of the reflective layer 60, light leakage can be avoided. The user will not see the light transmitted from the plate edge 504 of the top plate 50. It is worth mentioning that since the transparent substrate 44 of the light shielding plate is not covered by the light absorption layer 48 at the plate side edge 36a, the first extension section 64 of the reflective layer 60 will reflect the light transmitted from the transparent substrate 44 at the plate side edge 36a back to each of the light guide plates 34, thereby increasing the amount of light entering each of the light guide plates 34, and further increasing the brightness of the light transmitted from the light emitting area 502 of the top plate 50.

The above description is only the preferred embodiment of the present invention. Any equivalent changes made by applying the present invention specification and the scope of patent application should be included in the patent scope of the present invention.

1,2,3,4: Touch input device 10: Circuit board 10a: Long side 10b: Long side 10c: Short side 10d: Short side 102: Upper surface 104: Lower surface 106: Board side 12: Sensing area 14: Sensing circuit 16: Light source circuit 18: Reading element 20: Light source driving element 22: Light emitting element 222: Side emitting surface 24: Spacer 24a: Long side 24b: Long side 242: Top surface 244: Bottom surface 246: Light leakage side 26: Accommodating hole 26a: Hole wall 28: Spacer rib 30: First spacer section 32: Second spacer section 34: light guide plate 342: notch 342a: long light entry edge 342b: short light entry edge 36: light shielding plate 36a: board side edge 38: main board section 382: light transmission area 40: first extension section 42: second extension section 422: heat dissipation hole 44: transparent substrate 442: inner surface 444: outer surface 46: reflective layer 48: light absorption layer 482: hollow area 50: top plate 502: light exit area 504: board edge 52: transparent board 522: operation surface 54: bottom layer 60: reflective layer 60a: upper reflective surface 602: opening 604: through hole 62: main reflective section 64: First extension section 66: Second extension section X: Long axis Y: Short axis Z: Stacking axis

FIG. 1 is a three-dimensional diagram of a touch input device of a first preferred embodiment of the present invention. FIG. 2 is an exploded three-dimensional diagram of a touch input device of a first preferred embodiment of the present invention. FIG. 3 is a partially exploded schematic diagram of a touch input device of a first preferred embodiment of the present invention. FIG. 4 is a three-dimensional diagram of a touch input device of a first preferred embodiment of the present invention from another perspective, revealing the back of the touch input device. FIG. 5 is a cross-sectional schematic diagram of the direction 5-5 of FIG. 1. FIG. 6 is a cross-sectional schematic diagram of a touch input device of a second preferred embodiment of the present invention. FIG. 7 is a cross-sectional schematic diagram of a touch input device of a third preferred embodiment of the present invention. FIG8 is a partially exploded schematic diagram of a touch input device according to a fourth preferred embodiment of the present invention. FIG9 is a cross-sectional schematic diagram of a touch input device according to a fourth preferred embodiment of the present invention.

1: Touch input device

50: Top plate

502: Light-emitting area

504: Board edge

52: Transparent plate

522: Operation surface

X: Long axis

Y: short axis

Z: stacking axis

Claims (20)

A touch input device comprises: A circuit board having an upper surface, a lower surface and a side edge of the board, the upper surface having a plurality of sensing areas arranged along a long axis; A plurality of light-emitting elements arranged on the upper surface of the circuit board and arranged along the long axis; A spacer arranged above the upper surface of the circuit board, the spacer having a top surface, a bottom surface and a light leakage edge, and the spacer having a plurality of receiving holes, the receiving holes penetrating the top surface and the bottom surface, the receiving holes arranged along the long axis and corresponding to the sensing areas respectively, and the light leakage edge corresponding to the side edge of the circuit board; wherein the light-emitting elements protrude into the receiving holes respectively; A plurality of light guide sheets are respectively arranged in the receiving holes of the spacer; A light shielding plate comprises a main board section, a first extension section and a second extension section, the main board section covers the top surface of the spacer, the main board section has a plurality of light-transmitting areas, the light-transmitting areas are arranged along the long axis, and the light-transmitting areas correspond to the light guide sheets respectively; the first extension section covers the light leakage edge of the spacer and the board side edge of the circuit board; the second extension section is connected to the first extension section and combined with the lower surface of the circuit board; and A top plate is arranged on the main board section of the light shielding plate, the top plate has a plurality of light-emitting areas, the light-emitting areas are arranged along the long axis and correspond to the light-transmitting areas of the main board section of the light shielding plate respectively. A touch input device as described in claim 1, wherein each of the light-emitting elements is located between each of the sensing areas of the circuit board and the side of the board. A touch input device as described in claim 2, wherein the circuit board has two opposite long sides in a short axis direction, and each of the long sides extends along the long axis direction, and the long side of the two long sides closer to the light-emitting elements constitutes the side of the board. A touch input device as described in claim 3, wherein the spacer has a first spacer section and a second spacer section in the direction of the short axis, the first spacer section has the receiving holes, and the second spacer section has the light leakage edge; the second extension section of the shading plate extends at least to the lower surface of the circuit board and is located directly below the second spacer section. A touch input device as described in claim 4, wherein the second extension section of the shading plate extends to the lower surface of the circuit board and is located directly below the light-emitting elements, or the second extension section of the shading plate extends to the lower surface of the circuit board and is located directly below the sensing areas. A touch input device as described in claim 5, wherein the second extension section of the shading plate extends to directly below the sensing areas, and the second extension section of the shading plate has a plurality of heat dissipation holes, which are arranged along the long axis and are respectively located directly below the light-emitting elements. A touch input device as described in claim 2, wherein each light guide has a receiving portion, and each light emitting element protrudes into the receiving portion of each light guide; each light emitting element has a side light emitting surface, and the side light emitting surface of each light emitting element faces the wall of the receiving portion of each light guide. The touch input device as described in claim 1 includes a reflective layer disposed between the upper surface of the circuit board and the bottom surface of the spacer, the reflective layer having a plurality of through holes arranged along the long axis and the light-emitting elements passing through the through holes respectively. A touch input device as described in claim 8, wherein the reflective layer has a plurality of openings, the openings are arranged along the long axis and correspond to the accommodating holes and the sensing areas of the circuit board respectively. A touch input device as described in claim 1, wherein the light emitting areas of the top plate, the light transmitting areas of the main board section of the shading plate and the sensing areas on the circuit board overlap upward on a stacking axis. A touch input device as described in claim 10, wherein the shading plate comprises a transparent substrate and at least one shading layer, the at least one shading layer is disposed on the transparent substrate, and the at least one shading layer and the light-emitting elements overlap in the stacking axis direction. A touch input device comprises: A circuit board having an upper surface and a lower surface, the upper surface having a plurality of sensing areas arranged along a long axis; A plurality of light-emitting elements arranged on the upper surface of the circuit board and arranged along the long axis; A reflective layer comprising a main reflective section, a first extension section and a second extension section, wherein the main reflective section is arranged on the upper surface of the circuit board, the main reflective section has a plurality of through holes, the through holes are arranged along the long axis and the light-emitting elements pass through the through holes respectively; A spacer, disposed on the main reflective section of the reflective layer, the spacer having a top surface, a bottom surface and a light leakage edge, and the spacer having a plurality of accommodation holes, the accommodation holes penetrating the top surface and the bottom surface, the accommodation holes being arranged along the long axis and corresponding to the sensing areas and the through holes respectively, wherein the light-emitting elements protrude into the accommodation holes respectively; A plurality of light guides, respectively disposed in the accommodation holes of the spacer; A light shielding plate, covering the top surface of the spacer, the light shielding plate having a plate side edge and a plurality of light-transmitting areas, the plate side edge corresponding to the light leakage edge of the spacer, the light-transmitting areas being arranged along the long axis, and the light-transmitting areas respectively corresponding to the light guides; and A top plate is arranged on the shading plate, and the top plate has a plurality of light emitting areas, which are arranged along the long axis and correspond to the light-transmitting areas of the shading plate respectively; Wherein, the first extension section of the reflective layer covers the light-leaking edge of the spacer and the side edge of the shading plate; the second extension section of the reflective layer is connected to the first extension section and combined with the top plate. In the touch input device as described in claim 12, the main reflective section has a plurality of openings, which are arranged along the long axis and correspond to the accommodating holes and the sensing areas of the circuit board respectively. A touch input device as described in claim 12, wherein the second extension section of the reflective layer is coupled to the bottom of the top plate. A touch input device as described in claim 12, wherein each of the light-emitting elements is located between each of the sensing areas of the circuit board and the light-leaking edge of the spacer. A touch input device as described in claim 15, wherein the spacer has two opposite long sides in a short axis direction, and each of the long sides extends along the long axis direction, and the long side of the two long sides that is closer to the light-emitting elements constitutes the light leakage edge. A touch input device as described in claim 15, wherein each light guide has a receiving portion, and each light emitting element protrudes into the receiving portion of each light guide; each light emitting element has a side light emitting surface, and the side light emitting surface of each light emitting element faces the wall of the receiving portion of each light guide. A touch input device as described in claim 12, wherein the light emitting areas of the top plate, the light transmitting areas of the light shielding plate and the sensing areas on the circuit board overlap upward on a stacking axis. A touch input device as described in claim 18, wherein the shading plate comprises a transparent substrate and at least one shading layer, the at least one shading layer is disposed on the transparent substrate, and the at least one shading layer and the light-emitting elements overlap in the stacking axis. A touch input device as described in claim 19, wherein the transparent substrate of the shading plate is not covered by the at least one shading layer on the side of the plate.

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