WO2015081637A1

WO2015081637A1 - Infrared touch screen and touch-control display device

Info

Publication number: WO2015081637A1
Application number: PCT/CN2014/072615
Authority: WO
Inventors: 陈伟山; 翟振耀; 栗勇
Original assignee: 深圳市天时通科技有限公司
Priority date: 2013-12-06
Filing date: 2014-02-27
Publication date: 2015-06-11
Also published as: CN104699326A; CN104699326B

Abstract

An infrared touch screen, comprising a touch-control substrate, an annular flexible printed circuit board, a plurality of infrared emitters, a plurality of infrared receivers, a filter strip and a control circuit board. The flexible printed circuit board can extend from the upper surface of the touch-control substrate to the lower surface and is electrically connected to the control circuit board; the infrared emitters are arranged in parallel along the flexible printed circuit board; the plurality of infrared receivers and the plurality of infrared emitters are disposed on opposite sides of the upper surface respectively, the plurality of infrared receivers being electrically connected to the flexible printed circuit board; the filter strip covers the plurality of infrared emitters and the plurality of infrared receivers; infrared light emitted from the infrared emitters can be transmitted through the filter strip into the infrared receivers; and the control circuit board obtains the positions of the touch points on the infrared touch-control net based on the infrared light received by the infrared receivers. The infrared touch screen avoids soldering producing many soldered spots, simplifies the manufacturing process, and reduces cost.

Description

Infrared touch screen and touch display device

[Technical Field]

The present invention relates to a touch screen, and more particularly to an infrared touch screen and a touch display device.

【Background technique】

The infrared touch screen uses a dense infrared light matrix in the X and Y directions to detect and locate the user's touch. The infrared touch screen is provided with a circuit board outer frame on the front side of the display, and the circuit board arranges an infrared transmitting tube and an infrared receiving tube on four sides of the screen, and one-to-one correspondingly forms an infrared light matrix which is horizontally and vertically intersected. When the user touches the screen, the finger blocks the two infrared rays passing through the position, so that the position of the touch point on the screen can be determined.

At present, the infrared touch screen is usually composed of a two-layer PCB board, a touch substrate, an LED lamp and additional accessories. Among them, the LED light is set on the upper PCB board. The upper PCB board is electrically connected to the lower layer control circuit board by soldering. In the welding process, due to the large number of solder joints, the operation in the manufacturing process is complicated, resulting in high labor costs.

[Summary of the Invention]

Based on this, it is necessary to provide an infrared touch screen which is simple in structure and convenient to manufacture.

An infrared touch screen comprising:

a transparent touch substrate, the touch substrate comprising an upper surface and a lower surface parallel to the upper surface;

An annular flexible circuit board is fixedly disposed around the touch substrate, and the flexible circuit board extends from the upper surface of the touch substrate to the lower surface;

a plurality of infrared emitters located above the upper surface, the plurality of infrared emitters being arranged side by side on the flexible circuit board adjacent to the two sides of the upper surface, and electrically connected to the flexible circuit board connection;

a plurality of infrared receivers disposed above the upper surface, the plurality of infrared emitters being juxtaposed on the flexible circuit board adjacent to two sides of the upper surface, the plurality of infrared receivers and The plurality of infrared emitters are oppositely disposed, the plurality of infrared receivers are electrically connected to the flexible circuit board, and the infrared receiver receives infrared light emitted by the infrared emitter;

a filter strip disposed on the plurality of infrared emitters and the plurality of infrared receivers, wherein infrared light emitted by the infrared emitters is transparent to the filter strips, and the infrared rays are in the touch Forming an infrared touch screen above the upper surface of the control substrate, the infrared light entering the infrared receiver through the filter strip;

a control circuit board disposed under the lower surface, the control circuit board is electrically connected to the flexible circuit board, and the control circuit board acquires the infrared touch according to the infrared receiver receiving infrared light The location of the touch point on the web.

In one embodiment, the filter strip is provided with a receiving slot, the receiving slot extends along the axis of the filter strip, and the infrared emitter is received in the receiving slot, and the receiving slot is away from The sidewall of the edge of the touch panel is fixedly connected to the touch substrate, and the sidewall of the receiving slot adjacent to the edge of the touch substrate is fixedly connected to the flexible circuit board.

In one embodiment, the receiving groove has a trapezoidal cross section, and the side wall of the receiving groove connected to the touch substrate is an inclined wall, and the inclined wall is inclined with respect to a horizontal plane, and the inclined wall is Glossy.

In one embodiment, in one embodiment, the filter strips are four, and the four filter strips are respectively fixed on edges of the upper surface of the touch substrate.

In one embodiment, the flexible circuit board includes a body and a connecting arm, the body is elongated and disposed on a peripheral edge of the upper surface of the touch substrate, and the connecting arm is disposed on the body One side of the edge of the touch substrate, the free end of the connecting arm extends to a lower surface of the touch substrate, and the free end of the connecting arm is electrically connected to the control circuit board.

In one embodiment, the flexible circuit boards are four, each of the flexible circuit boards is elongated, and the four flexible circuit boards are sequentially connected end to end and electrically connected to each other.

In one embodiment, a plurality of flexible circuit connectors and FPC cables are further included, and both ends of the flexible circuit board are provided with a flexible circuit connector, and the FPC cable is disposed on the two adjacent terminals. Between the flexible circuit boards, two ends of the FPC cable are respectively electrically connected to two adjacent flexible circuit connectors.

In one embodiment, a plurality of pin connectors are further included, and both ends of the flexible circuit board are provided with a pin connector, and two adjacent pin connectors are coupled to each other to make adjacent The two flexible circuit boards are electrically connected.

In one embodiment, the control circuit board is annular, and an edge of the control circuit board is flush with an edge of the touch substrate.

In one embodiment, the control circuit board is four, the control circuit board is elongated, and the four control circuit boards are connected end to end in sequence, and are electrically connected to each other.

In one embodiment, the control circuit board is provided with a flexible circuit connector and an FPC cable at both ends, and the FPC cable is disposed between two adjacent control circuit boards, the FPC Both ends of the cable are electrically connected to two adjacent flexible circuit connectors, respectively.

In one embodiment, the two ends of the control circuit board are provided with a pin connector, and the two adjacent pin connectors are mated to electrically connect the plurality of the control circuit boards to each other. .

In one embodiment, the plane of the flexible circuit board and the plane of the touch substrate are perpendicular to each other, and the flexible circuit board is fixedly connected to the outer sidewall of the touch substrate.

In one embodiment, the flexible circuit boards are four, and the four flexible circuit boards are end-to-end spliced into a ring shape and electrically connected to each other.

In one embodiment, both ends of the flexible circuit board are provided with a flexible circuit connector and an FPC cable, and the FPC cable is disposed between two adjacent flexible circuit boards, the FPC Both ends of the cable are electrically connected to two adjacent flexible circuit connectors, respectively.

In one embodiment, the flexible circuit board is provided with a pin connector at both ends, and the two adjacent pin connectors are mated to electrically connect the plurality of flexible circuit boards to each other. .

In one embodiment, the method further includes a plurality of flexible circuit connecting plates, the flexible circuit connecting plate is elongated, one end of the flexible circuit connecting board is electrically connected to the flexible circuit board, and the other end is connected to the control circuit The board is electrically connected.

In one embodiment, a flexible circuit connector is disposed on a side of the control circuit board, and the flexible circuit connection board is adjacent to an end of the control circuit board through the flexible circuit connector and the control circuit board Electrical connection.

In one embodiment, the flexible circuit connection board and the control circuit board are each provided with a pin connector, and the flexible circuit connection board and the control circuit board are electrically connected through the pin connector.

A touch display device is also provided.

A touch display device includes:

The above infrared touch screen;

a display screen disposed on one side of the touch substrate and stacked on the touch screen.

The infrared touch screen enables the infrared emitter, the infrared receiver and the control circuit through the flexible circuit board, compared with the conventional method of electrically connecting the PCB board and electrically connecting the upper PCB board and the lower layer control circuit board by soldering. The plates are electrically connected, thus avoiding the occurrence of more solder joint welding processes, simplifying the manufacturing process and reducing costs.

Moreover, in the above infrared touch screen, the flexible circuit connector or the pin connector is detachably connected to the control circuit board to avoid electrical connection between the flexible circuit board and the control circuit board. When a component of a flexible circuit board, an infrared receiver, an infrared emitter, or a control board has a quality problem or is damaged during the manufacturing process, it is only necessary to replace some of the components by removing the flexible circuit board. The components that are welded together are replaced, so the manufacturing cost can be saved.

Again, using a flexible circuit board to connect the infrared emitter and the infrared receiver, the volume occupied by the components can be reduced. The frame of the above infrared touch screen can reach 5~6mm, which is beneficial to the development of the infrared touch screen toward a narrow frame and thin.

[Description of the Drawings]

1 is an exploded view of an infrared touch screen of an embodiment;

2 is an assembled view of the infrared touch screen shown in FIG. 1;

Figure 3 is a cross-sectional view of the infrared touch screen shown in Figure 1;

4 is a partial enlarged view of a portion I of the infrared touch screen of FIG. 2;

5 is an assembled view of some components of the infrared touch screen shown in FIG. 1;

6 is a partial enlarged view of a portion II of the infrared touch screen shown in FIG. 5;

Figure 7 is a partial enlarged view of another embodiment of the portion II of Figure 6;

Figure 8 is a partial enlarged view of another embodiment of the portion II of Figure 6;

Figure 9 is a perspective view of the infrared touch screen shown in Figure 1;

Figure 10 is a partial enlarged view of the portion of the infrared touch screen III of Figure 9;

Figure 11 is a partial enlarged view of another embodiment of the portion III of Figure 9;

Figure 12 is a partial enlarged view of another embodiment of the portion III of Figure 9;

FIG. 13 is a perspective view of an infrared touch screen according to another embodiment; FIG.

Figure 14 is a cross-sectional view of the infrared touch screen shown in Figure 13;

15 is a cross-sectional view of an infrared touch screen of another embodiment;

16 is a perspective view of an infrared touch screen according to another embodiment;

Figure 17 is a partial enlarged view of the IV portion of the infrared touch screen of Figure 16;

Figure 18 is a partial enlarged view of another embodiment of the portion IV of Figure 16;

Figure 19 is a partial enlarged view of another embodiment of the IV portion of Figure 16;

FIG. 20 is a schematic structural diagram of a touch display device according to an embodiment.

【detailed description】

In order to facilitate the understanding of the present invention, the present invention will be described more fully hereinafter with reference to the accompanying drawings. Preferred embodiments of the invention are given in the drawings. However, the invention may be embodied in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that this disclosure will be more fully understood.

It should be noted that when an element is referred to as being "fixed" to another element, it can be directly on the other element or the element can be present. When an element is considered to be "connected" to another element, it can be directly connected to the other element or. The terms "vertical", "horizontal", "left", "right", and the like, as used herein, are for the purpose of illustration and are not intended to be the only embodiment.

All technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs, unless otherwise defined. The terminology used in the description of the present invention is for the purpose of describing particular embodiments and is not intended to limit the invention. The term "and/or" used herein includes any and all combinations of one or more of the associated listed items.

Referring to FIG. 1 to FIG. 7 , an infrared touch screen 100 of an embodiment includes a touch substrate 110 , a flexible circuit board 120 , a flexible circuit connector 130 , a plurality of FPC cables 140 , and a plurality of infrared emitters 150 and An infrared receiver 160, a filter strip 170 and a control circuit board 180.

The touch substrate 110 is tempered glass. The tempered glass is chemically tempered with flat glass, and its surface hardness is H7H, and the warpage is ‰1‰. The touch substrate 110 includes an upper surface 111 and a lower surface 112 that is parallel to the upper surface 111, and the upper surface 111 is an upper surface. The touch substrate 110 is provided with a screen printed reference line 113 near a side of the infrared emitter 150.

Referring to FIG. 3 and FIG. 4 , the annular flexible circuit board 120 is fixedly disposed around the touch substrate 110 . The flexible circuit board 120 may extend from the upper surface 111 of the touch substrate 110 to the lower surface 112. A side surface of the flexible circuit board 120 adjacent to the touch substrate 110 is provided with a double-sided tape, and the flexible circuit board 120 is fixed on the touch substrate 110 by a double-sided tape. Specifically, in the embodiment, the flexible circuit board 120 includes a body 121 and a connecting arm 123. The body 121 is elongated. The body 121 is disposed on a peripheral edge of the upper surface of the touch substrate 110. The connecting arm 123 is disposed on a side of the body 121 near the edge of the touch substrate 110. The free end of the connecting arm 123 extends to the lower surface 112 of the touch substrate 110. The free end of the connecting arm 123 is electrically connected to the control circuit board 180. Referring to FIGS. 5 and 6, the flexible circuit board 120 is four. The flexible circuit board 120 is elongated. The four flexible circuit boards 120 are connected end to end in sequence, and are spliced into a ring shape. The four flexible circuit boards 120 are electrically conducted to each other. One side of the body 121 is aligned with the reference line 113 on the touch substrate 110.

Specifically, the flexible circuit board 120 is a ring-shaped monolithic structure that does not require electrical connection using other components for splicing.

It can be understood that in other embodiments, please refer to FIG. 7 at the same time, the flexible circuit connector 130 is disposed at both ends of the body 121. FPC (Flexible Printed A circuit is disposed between the two adjacent flexible circuit boards, and two ends of the FPC cable are electrically connected to the adjacent two flexible circuit connectors 130, respectively. The FPC cable 140 is elongated, and the two ends are designed to be pluggable and can be directly connected to the flexible circuit connector 130 or soldered to both ends of the body 121. The middle of the FPC cable 140 is the line. The substrate of the FPC cable 140 is rolled copper, and the FPC cable 140 has the characteristics of resistance to tortuosity and high flexibility.

Referring to FIG. 8 at the same time, it can be understood that the plurality of flexible circuit connectors 130 and the plurality of FPC cables 140 can be omitted. Both ends of the body 121 are provided with pin connectors 190, and two adjacent pin connectors 190 are matedly connected to electrically connect adjacent two flexible circuit boards 120.

A plurality of infrared emitters 150 are located above the upper surface 111. A plurality of infrared emitters 150 are arranged side by side on the flexible circuit board 120 on the adjacent sides of the upper surface 111, and are electrically connected to the flexible circuit board 120. A plurality of infrared emitters 150 can emit infrared light. The elongated flexible circuit board 120 is distributed along the edge of the touch substrate 110, and the infrared emitters 150 are also distributed along the adjacent two edges of the touch substrate 110. Specifically, in the embodiment, the infrared emitter 150 may be an LED tube. LED tubes emit infrared light.

A plurality of infrared receivers 160 are located above the upper surface 111. A plurality of infrared receivers 160 are arranged side by side on the flexible circuit board 120 on the adjacent sides of the upper surface 111. The infrared receiver 160 is disposed opposite the infrared emitter 150. A plurality of infrared receivers 160 are electrically connected to the flexible circuit board 120. The infrared receiver 160 receives the infrared light emitted by the infrared emitter 150. The infrared generator emits infrared light to the opposite infrared receiver 160 on both sides of the touch substrate 110, and the infrared receiver 160 receives the emitted infrared light. The infrared light forms an infrared touch screen on one side of the touch substrate 110. When the touch substrate 110 is touched to form a touch point, the infrared receiver 160 and the infrared emitter 150 can acquire the infrared light.

Specifically, in the present embodiment, the infrared receiver 160 is an infrared receiving LED tube.

The filter strip 170 is disposed on the plurality of infrared emitters 150 and the plurality of infrared receivers 160. The infrared light emitted by the infrared emitter 150 can pass through the filter strip 170, and the infrared light can be received by the infrared receiver 160 via the filter strip 170. A receiving groove 171 is defined in the filter strip 170. The receiving groove 171 extends along the axis of the filter strip 170, and the infrared emitter 150 is received in the receiving groove 171. The side wall of the receiving slot 171 adjacent to the edge of the touch substrate 110 is fixedly connected to the touch substrate 110. The side wall of the receiving slot 171 away from the edge of the touch substrate 110 is fixedly connected to the flexible circuit board 120. The receiving groove 171 has a trapezoidal cross section, and the side wall of the receiving groove 171 connected to the touch substrate 110 is an inclined wall 172. The inclined wall 172 is disposed obliquely with respect to the horizontal plane, and the inclined wall 172 is a light exiting surface. Light exits through the inclined wall 172. The filter strip 170 has a filtering effect on the light emitted by the infrared emitter 150, so that the light transmitted through the filter strip 170 is all infrared light. The filter strip 170 has a filtering effect on the light entering the infrared receiver 160, ensuring that the infrared receiver 160 can only receive infrared light from the infrared emitter 150, thereby avoiding the light entering the infrared receiver 160 due to the external environment, affecting the infrared receiver. 160 judgment of the position of the touch point. Moreover, the filter strip 170 limits the infrared emitter 150 and the infrared receiver 160 in the receiving groove 171, which can increase the strength of the overall assembly.

The filter strip 170 can be made into a one-piece or a panel type according to the production line production and the assembly requirements of the infrared touch screen 100. Specifically, in the present embodiment, the filter strip 170 has an integral structure. The filter strip 170 has a frame shape. The filter strips 170 are disposed on the periphery of the touch panel 110 such that the infrared emitters 150 and the infrared receivers 160 are received in the receiving slots 171 of the filter strips 170.

It can be understood that there are four filter strips 170, and four filter strips are respectively fixed on the outer edges of the upper surface of the touch substrate.

The control circuit board 180 is disposed below the lower surface 112. The control circuit board 180 is electrically connected to the flexible circuit board 120. The control circuit board 180 acquires the position of the touch point on the infrared touch screen according to the situation that the infrared receiver 160 receives the infrared light. The control circuit board 180 has a plurality of components such as IC, capacitor, and resistor on one side, and a double-sided adhesive on the other side, and the control circuit board 180 is fixed on the lower surface 112 of the touch substrate 110 by using a backing.

Please refer to FIG. 9 and FIG. 10. Specifically, in the present embodiment, the control circuit board 180 is annular. The edge of the control circuit board 180 is flush with the edge of the touch substrate 110. There are four control circuit boards 180. The control circuit board 180 is elongated. The four control circuit boards 180 are connected end to end in sequence, and are spliced into a ring shape. The four control circuit boards 180 are electrically connected to each other. Specifically, in the embodiment, the flexible circuit connector 130 and the plurality of FPC cables 140 are disposed at both ends of the control circuit board 180. The FPC cable 140 is disposed between two adjacent control circuit boards 180. The two ends of the FPC cable 140 are electrically connected to the adjacent two flexible circuit connectors 130, respectively. The FPC cable 140 is elongated. The two ends are designed to be pluggable and can be directly connected to the flexible circuit connector 130 or soldered to both ends of the flexible circuit board 120. The middle of the FPC cable 140 is the line. The substrate of the FPC cable 140 is rolled copper, and the FPC cable 140 has the characteristics of resistance to tortuosity and high flexibility.

Referring to FIG. 11, it can be understood that the plurality of flexible circuit connectors 130 and the plurality of FPC cables 140 can be omitted. A pin connector 190 is provided at both ends of the control circuit board 180. Adjacent two pin connectors 190 are mated to electrically connect adjacent two control circuit boards 180.

Referring to Figure 12, it can be understood that the pin connector 190 can also be omitted. The control circuit board 180 is a ring-shaped monolithic structure that requires no other components to be electrically connected for splicing.

Compared with the conventional infrared touch screen, the infrared touch screen 100 has at least the following advantages:

First, on the infrared touch screen 100, the infrared emitter 150 and the infrared receiver 160 are electrically connected to the control circuit board 180 through the flexible circuit board 120. Compared with the conventional method of electrically connecting the PCB board and the LED, and electrically connecting the upper PCB board and the lower layer control circuit board 180 by soldering, the infrared touch screen 100 can avoid more solder joints and a simple soldering process. The production process reduces costs.

Moreover, in the above infrared touch screen 100, the flexible circuit connector 130 or the pin connector 190 is detachably connected to the control circuit board 180 to avoid electrical connection between the flexible circuit board 120 and the control circuit board 180. When a component of the flexible circuit board 120, the infrared receiver 160, the infrared emitter 150, or the control circuit board 180 has a quality problem or is damaged during the manufacturing process, only a part of the components can be removed by disassembling the flexible circuit board 120. Replacement eliminates the need to replace all the components that are welded together, thus saving manufacturing costs.

Again, by connecting the infrared emitter 150 and the infrared receiver 160 with the flexible circuit board 120, the volume occupied by the components can be reduced. The frame of the infrared touch screen 100 can reach 5-6 mm, which is beneficial to the development of the infrared touch screen 100 toward a narrow frame and a thin trend.

Referring to FIG. 13 and FIG. 14 , in other embodiments, the difference is that the infrared touch screen 100 includes a plurality of flexible circuit connecting plates 199 . The flexible circuit connecting plate 199 is elongated. The control circuit board 180 is provided with a flexible circuit connector 130. One end of the flexible circuit connection board 199 is electrically connected to the flexible circuit board 120, and the other end is electrically connected to the control circuit board 180 through the flexible circuit connector 130.

Specifically, the control circuit board 180 is square. The control circuit board 180 is disposed on the lower surface 112 of the touch substrate 110. The area of the control circuit board 180 is smaller than the area of the touch substrate 110. A plurality of flexible circuit connectors 130 are provided on the periphery of the control circuit board 180. The flexible circuit connection board 199 and the flexible circuit board 120 have an integral structure. The flexible circuit connection board 199 extends from one side of the flexible circuit board 120 and extends to the lower surface 112. The axis of the flexible circuit connection plate 199 is perpendicular to the axis of the flexible circuit board 120. The control circuit board 180 is provided with a flexible circuit connector 130. The flexible circuit connection board 199 is electrically connected to the control circuit board 180 through the flexible circuit connector 130 near one end of the control circuit board 180. There are five flexible circuit connecting plates 199. Then, five flexible circuit connectors 130 are provided on the control circuit board 180. A flexible circuit connecting plate 199 is disposed on each of the three flexible circuit boards 120. A flexible circuit connector 130 is disposed on each of the three sides of the control circuit board 180. The three flexible circuit boards 120 are electrically connected to the control circuit board 180 through a flexible circuit connection board 199. In addition to this, two flexible circuit connecting plates 199 are connected to the fourth flexible circuit board 120. Two flexible circuit connectors 130 are provided on the fourth side of the control circuit board 180. The fourth flexible circuit board 120 is electrically connected to the control circuit board 180 through two flexible circuit connection boards 199 and two flexible circuit connectors 130. Since the interfaces of the different control circuit boards 180 have different pins and the number of pins is large, it is necessary to electrically conduct the pins of the interface through the two flexible circuit connection boards, respectively, to achieve the flexible circuit board 120 and control. A good electrical connection between the boards 180 is possible.

It can be understood that in other embodiments, the flexible circuit connection board 199 can be an FPC cable. The FPC cable is elongated, and the two ends are designed to be pluggable and can be directly connected to the flexible circuit connector 130 of the control circuit board 180. The substrate of the FPC cable is rolled copper, and the FPC cable has the characteristics of resistance to tortuosity and high flexibility. Alternatively, one end of the FPC cable adjacent to the flexible circuit board 120 is electrically connected to the flexible circuit board 120 by soldering, and the other end is electrically connected to the control circuit board 180 through the flexible circuit connector 130.

It can be understood that the plurality of flexible circuit connectors 130 and the plurality of FPC cables 140 can be omitted. A flexible pin connector 199 is provided with a first pin connector at both ends. The flexible circuit board 120 and the control circuit board 180 are each provided with a second pin connector that is coupled to the first pin connector. The flexible circuit connecting board 199 is coupled to the second pin connector through the first pin connector to electrically connect the flexible circuit board 120 to the control circuit board 180. It can be understood that the flexible circuit connecting plate 199 is provided with a first pin connector at one end of the control circuit board 180, and the flexible circuit connecting plate 199 is electrically connected to the flexible circuit board 120 by soldering at the other end.

It can be understood that the first pin connector and the second pin connector can also be omitted. The flexible circuit board 120 is a ring-shaped monolithic structure that requires no other components to be electrically connected for splicing.

In the infrared touch screen 100, the control circuit board 180 does not need to be formed into a ring shape, and the shape of the control circuit board 180 is not limited, so that the production of the infrared touch screen 100 is facilitated.

Referring to FIG. 15 and FIG. 16 , in other embodiments, the plane of the flexible circuit board 120 and the plane of the touch substrate 110 are perpendicular to each other. Referring to FIGS. 17 and 18 , the flexible circuit board 120 is fixedly connected to the outer sidewall of the touch substrate 110 . Similarly, the flexible circuit boards 120 on the adjacent sides can be electrically connected through the FPC cable 140 or the pin connector 190. Referring to FIG. 19, the flexible circuit board 120 is a ring-shaped monolithic structure. The flexible circuit board 120 can be directly sleeved on the outer side of the touch substrate 110.

The filter strip 170 is directly provided with an infrared emitter 150 and an infrared receiver 160 in front. There is no need to open the square slot 171. The volume of the filter strip 170 is reduced, which is advantageous for narrowing the side frame of the infrared touch screen 100 described above.

In the infrared touch screen 100, since the flexible circuit board 120 is connected to the outer side wall of the touch substrate, the flexible circuit board 120 does not occupy the surface of the touch substrate, so that the edge of the infrared touch screen 100 can be narrowed. The frame of the infrared touch screen 100 can reach 2~3 mm, improve the performance of the infrared touch screen 100, and can make the infrared touch screen 100 beautiful.

Please refer to FIG. 20 . Meanwhile, the present invention further provides a touch display device 10 .

The touch display device 10 includes the touch screen 100 and the display screen 200 described above. The display screen 200 is disposed on one side of the touch substrate 110 and is stacked on the touch screen 100 .

The above-mentioned embodiments are merely illustrative of several embodiments of the present invention, and the description thereof is more specific and detailed, but is not to be construed as limiting the scope of the invention. It should be noted that a number of variations and modifications may be made by those skilled in the art without departing from the spirit and scope of the invention. Therefore, the scope of the invention should be determined by the appended claims.

Claims

An infrared touch screen, comprising:

a touch substrate, the touch substrate including an upper surface and a lower surface parallel to the upper surface;

a flexible circuit board fixedly disposed around the touch substrate, the flexible circuit board extending from the upper surface of the touch substrate to the lower surface;

a plurality of infrared emitters located above the upper surface, the plurality of infrared emitters being arranged side by side on the flexible circuit board adjacent to the two sides of the upper surface, and electrically connected to the flexible circuit board connection;

a plurality of infrared receivers disposed above the upper surface, the plurality of infrared emitters being juxtaposed on the flexible circuit board adjacent to two sides of the upper surface, the plurality of infrared receivers and The plurality of infrared emitters are oppositely disposed, the plurality of infrared receivers are electrically connected to the flexible circuit board, and the infrared receiver receives infrared light emitted by the infrared emitter;

a filter strip disposed on the plurality of infrared emitters and the plurality of infrared receivers, wherein infrared light emitted by the infrared emitters is transparent to the filter strips, and the infrared rays are in the touch Forming an infrared touch screen above the upper surface of the control substrate, the infrared light entering the infrared receiver through the filter strip; and

a control circuit board disposed under the lower surface, the control circuit board is electrically connected to the flexible circuit board, and the control circuit board acquires the infrared touch according to the infrared receiver receiving infrared light The location of the touch point on the web.
The infrared touch screen of claim 1 , wherein the filter strip is provided with a receiving slot, the receiving slot extends along an axis of the filter strip, and the infrared emitter is received in the The side of the receiving slot is fixedly connected to the touch panel, and the side wall of the receiving slot adjacent to the edge of the touch substrate is fixedly connected to the flexible circuit board.
The infrared touch screen according to claim 2, wherein the receiving groove has a trapezoidal cross section, and the side wall of the receiving groove connected to the touch substrate is an inclined wall for emitting light, The inclined wall is inclined with respect to the horizontal plane.
The infrared touch screen of claim 2, wherein the filter strips are four, and the four filter strips are respectively fixed on the peripheral edges of the upper surface of the touch substrate.
The infrared touch panel of claim 1 , wherein the flexible circuit board comprises a body and a connecting arm, the body is elongated and disposed on a peripheral edge of the upper surface of the touch substrate. The connecting arm is disposed on a side of the body near the edge of the touch substrate, the free end of the connecting arm extends to a lower surface of the touch substrate, and the free end of the connecting arm is electrically connected to the control circuit board connection.
The infrared touch screen of claim 1 , wherein the flexible circuit boards are four, each of the flexible circuit boards is elongated, and the four flexible circuit boards are connected end to end and electrically connected to each other.
The infrared touch screen of claim 6, further comprising a plurality of flexible circuit connectors and FPC cables, wherein the flexible circuit board is provided with a flexible circuit connector at both ends thereof, the FPC row A wire is disposed between the two adjacent flexible circuit boards, and two ends of the FPC cable are respectively electrically connected to two adjacent flexible circuit connectors.
The infrared touch screen according to claim 6, further comprising a plurality of pin connectors, wherein the flexible circuit board is provided with a pin connector at both ends, and the two adjacent plugs The pin connectors are mated to electrically connect adjacent two of the flexible circuit boards.
The infrared touch screen of claim 1 , wherein the control circuit board is annular, and an edge of the control circuit board is flush with an edge of the touch substrate.
The infrared touch screen of claim 1 , wherein the control circuit board is four, the control circuit board is elongated, and the four control circuit boards are connected end to end in sequence, and are electrically connected to each other.
The infrared touch screen according to claim 10, wherein both ends of the control circuit board are provided with a flexible circuit connector and an FPC cable, and the FPC cable is disposed on two adjacent ones. Between the control circuit boards, both ends of the FPC cable are electrically connected to two adjacent flexible circuit connectors.
The infrared touch screen according to claim 10, wherein both ends of the control circuit board are provided with a pin connector, and the two adjacent pin connectors are mated and connected to each other. The control circuit boards are electrically connected to each other.
The infrared touch screen of claim 1 , wherein a plane of the flexible circuit board and a plane of the touch substrate are perpendicular to each other, and the flexible circuit board and the outer sidewall of the touch substrate Fixed connection.
The infrared touch screen according to claim 13, wherein the flexible circuit boards are four, and the four flexible circuit boards are end-to-end spliced into a ring shape and electrically connected to each other.
The infrared touch screen according to claim 14, wherein both ends of the flexible circuit board are provided with a flexible circuit connector and an FPC cable, and the FPC cable is disposed on two adjacent ones. Between the flexible circuit boards, two ends of the FPC cable are respectively electrically connected to two adjacent flexible circuit connectors.
The infrared touch screen according to claim 14, wherein both ends of the flexible circuit board are provided with a pin connector, and the two adjacent pin connectors are mated and connected to each other. The flexible circuit boards are electrically connected to each other.
The infrared touch screen according to claim 1, further comprising a plurality of flexible circuit connecting plates, wherein the flexible circuit connecting plate is elongated, and one end of the flexible circuit connecting plate is electrically connected to the flexible circuit board Connected, the other end is electrically connected to the control circuit board.
The infrared touch screen according to claim 17, wherein a flexible circuit connector is disposed on a side of the control circuit board, and the flexible circuit connection board is adjacent to an end of the control circuit board to pass the flexible A circuit connector is electrically coupled to the control circuit board.
The infrared touch screen according to claim 17, wherein the flexible circuit connecting board and the control circuit board are provided with pin connectors, and the flexible circuit connecting board and the control circuit board pass The pin connectors are electrically connected.
A touch display device, comprising:

The touch screen of claim 1;

a display screen disposed on one side of the touch substrate and stacked on the touch screen.