TWI457804B - Touch screen structure and manufacturing method thereof - Google Patents

Description

Touch screen structure and manufacturing method thereof

The present invention relates to a touch screen, and more particularly to an optical touch screen structure.

First, please refer to Fig. 1. Generally, the optical touch screens are usually provided with a plurality of photo sensors 40 (for example, CMOS) at the corners of the rectangular screen, and the four sides of the rectangular screen are respectively A light source structure 20 is disposed. The light source structure 20 can guide light generated by a plurality of light emitting diodes (not shown) into the effective area 301 in the center of the screen, and then can utilize light sensing at the corners of the screen. The device 40 detects the shadow of the object in the effective area 301, and then calculates the coordinate position of the object.

Referring to FIGS. 1 and 2 together, FIG. 2 is a cross-sectional view taken along the line X1-X2 in FIG. 1. It can be seen from FIG. 2 that the light source structure 20 includes the light guiding strip 22, the frame 21 and the side cover. 23, wherein the light generated by the light-emitting diodes is reflected by the light guide bar 22 and the frame body 21, and then passes through the side cover 23 to enter the effective area 301 (as indicated by the direction of the arrow in FIG. 2).

Please continue to refer to FIG. 2 . The conventional optical touch screen generally further includes a display module 10 . The tempered glass 30 can be disposed on the display module 10 during assembly, and then the light source structure 20 and the light sensor 40 are pasted one by one. The surface of the tempered glass 30 is reinforced. As shown in FIG. 2, the display module 10 includes a housing 11, a bracket 12, a display panel 13, a back cover 14, a light source 15, a light guide plate 16, and an optical film 17, wherein the tempered glass 30 is fixed to the outer casing 11, and the bracket 12 The display panel 13 is disposed on the bracket 12, and the light source 15, the light guide plate 16, and the optical film 17 are disposed between the bracket 12 and the back cover 14.

However, it should be specially noted that since the conventional optical touch screen is provided with the tempered glass 30 between the display module 10 and the light source structure 20, the thickness of the touch screen is not only increased, but also the product is thinned. It also increases material costs. On the other hand, the assembly method of attaching components such as the light source structure 20 and the photo sensor 40 to the tempered glass 30 one by one will increase the complexity of the manufacturing process and also cause difficulty in rework of defective products.

An embodiment of the present invention provides a touch screen structure including a display module, a rectangular frame, a plurality of light guide bars, and a plurality of light sensors. The frame is disposed on the display module, wherein the frame has an opening corresponding to the sensing area of the touch screen structure. The light guiding strips are respectively disposed on a plurality of sides of the frame for guiding light from the light source to the sensing area. The light sensor is fixed on the frame to detect light in the sensing area.

The present invention further provides a method for manufacturing a touch screen structure, comprising: providing a rectangular frame body, wherein the frame body has an opening corresponding to the sensing area of the touch screen structure; and a plurality of light guiding strips are provided, respectively disposed in the frame a plurality of sides of the body for guiding a light to the sensing area; providing a plurality of light sensors, and combining the light sensors on the frame for detecting light; and providing a display The module, wherein the display module has a casing and the frame is fixed to the casing.

The above described objects, features, and advantages of the invention will be apparent from the description and appended claims

Please refer to Figures 3 and 4 together, and Figure 4 shows a cross-sectional view along the X3-X4 direction in Figure 3. As shown in the figure, the touch screen structure of an embodiment of the present invention can be an optical touch screen structure, which mainly includes a display module 50, a rectangular frame 60, a light guiding strip 70, and a light-permeable side cover. 80 and light sensor 90. The photo sensor 90 is, for example, a CMOS, and can be embedded in the upper left corner and the upper right corner of the rectangular frame 60, respectively. In addition, the light guiding strip 70 and the side cover 80 may be disposed on the four sides of the rectangular frame 60, respectively. In an embodiment of the invention, the rectangular frame 60 is not provided with a side cover 80.

It should be understood that the rectangular frame 60 can be integrally formed. The inner surface of the frame 60 is provided with a reflective material, and the light-emitting diode can be generated by the frame 60 and the light guiding strip 70. The light is directed into the effective area 601 in the center of the screen (as indicated by the direction of the arrow in FIG. 4), and then the light sensor 90 located at the corner of the screen can detect the shadow of the object in the effective area 601, thereby calculating The coordinate position of the object.

As can be seen from FIG. 4 , the display module 50 mainly includes a housing 51 , a bracket 52 , a display panel 53 , a back cover 54 , a light source 55 , a light guide plate 56 , and an optical film 57 , wherein the housing 51 is disposed around the display panel 53 . The bracket 52 is connected to the outer casing 51. The display panel 53 is disposed on the bracket 52. The light source 55, the light guide plate 56 and the optical diaphragm 57 are disposed between the bracket 52 and the back cover 54. It should be noted that the frame 60 in the embodiment is fixed on the outer casing 51 of the display module 50 and has a U-shaped cross section. The light guide bar 70 is received in the frame 60, and the side cover 80 is It is bonded to the opening of the frame 60. In an embodiment of the invention, the outer casing 51 and the bracket 52 may be integrally formed. In another embodiment of the present invention, the outer casing 51 is disposed around the display panel 53 and connected to the side cover 80, and the outer casing 51 can be formed integrally with the side cover 80.

Referring to FIG. 5 , the light guide bar 70 , the side cover 80 , the photo sensor 90 , and the light emitting diode L can be placed into the frame 60 from the inner side and the outer side of the frame 60 respectively during assembly. The frame 60 of the example is a single component that is integrally formed, so that the light guide bar 70, the side cover 80, the photo sensor 90, and the light-emitting diode L can be directly fixed inside the frame 60 during assembly, so that It can be easily assembled to improve production efficiency and achieve good positioning.

As shown in FIG. 5, a bevel 81 is formed at both ends of the side cover 80 in the embodiment, wherein an angle A is formed between the inclined faces 81 of the two adjacent side covers 80 (as shown in FIG. 3), and The angle A can range from 60° to 89°, or the bevel 81 can be replaced by a circular arc surface, so that the sensing angle of the photo sensor 90 can range from 60° to 89°. between.

Corresponding to the embodiment disclosed in FIGS. 3~5, the present invention further provides a method for manufacturing a touch screen structure (as shown in FIG. 9), which mainly includes: providing a rectangular frame 60, wherein the frame 60 The central portion has an opening corresponding to the sensing area 601 of the touch screen structure (step S11); a plurality of light guiding strips 70 are provided on the four sides of the frame 60 for receiving from at least one light source (for example, The light of the light-emitting diode L) shown in FIG. 5 is guided to the sensing area 601 (step S12); a plurality of light sensors 90 are provided, and the light sensor 90 is coupled to the frame 60 for The light is detected (step S13); and a display module 50 is provided, wherein the display module 50 has a housing 51 and the frame 60 is fixed to the housing 51 (step S14).

Referring to FIG. 6 again, the touch screen structure of another embodiment of the present invention mainly manufactures the frame 60 and the outer casing 51 of the lower display module 50 in an integrated manner, thereby reducing the number of parts and simplifying the assembly process. . Alternatively, the side cover 80 and the outer casing 51 of the lower display module 50 may be integrally formed (as shown in FIG. 7). At this time, the frame 60 and the light guiding strip 70 are covered by the outer casing 51 and the side cover 80. By coating, the number of parts can be reduced and the assembly process can be simplified, thereby greatly increasing production efficiency.

Referring to FIG. 8 , in another embodiment of the touch screen structure, the frame 60 and the light guide strip 70 may be disposed together inside the side cover 80 . As shown in FIG. 8, the frame 60 and the side cover 80 respectively have a U-shaped cross section, wherein the light guiding strip 70 is disposed inside the frame 60, and the side cover 80 is disposed outside the frame 60 and the light guiding strip 70. And fixed to the outer casing 51 of the display module 50.

Corresponding to the embodiment disclosed in FIG. 8, the present invention further provides a method for manufacturing a touch screen structure (as shown in FIG. 10), which mainly includes: providing a rectangular frame 60, wherein the frame 60 has a central portion The opening corresponds to the sensing area 601 of the touch screen structure (step S21); a plurality of light guiding strips 70 are provided, which are respectively disposed on the four sides of the frame 60 for receiving the light source (for example, as shown in FIG. 5 The light of the light-emitting diode L) is guided to the sensing region 601 (step S22); a plurality of side covers 80 are provided, respectively fixed to the frame 60 and corresponding to the light guiding strip 70, wherein the light passes through the side cover 80. And entering the sensing area 601 (step S23); providing a plurality of photo sensors 90, and combining the photo sensor 90 on the frame 60 for detecting light (step S24); and providing a display mode The group 50, wherein the display module has a casing 51, and the side cover 80 is fixed to the casing 51 (step S25).

In summary, the present invention provides an optical touch screen structure in which a light guide bar, a side cover, a photo sensor, and a light emitting diode are first fixed in a hollow rectangular frame body, and then the foregoing The frame is fixed to the display module. Alternatively, the outer casing of the display module may be integrally formed with the frame or the side cover; for example, the frame may be made of polycarbonate (PC), and the side cover may be made of acrylic. (PMMA), since the touch screen structure of the present invention can be easily assembled and has a good positioning effect, it can be widely applied to various electronic devices.

Although the present invention has been disclosed above in the foregoing embodiments, it is not intended to limit the invention. Those skilled in the art having the ordinary skill in the art can make some modifications and refinements without departing from the spirit and scope of the invention. Therefore, the scope of the invention is defined by the scope of the appended claims.

10. . . Display module

11. . . shell

12. . . support

13. . . Display panel

14. . . Back cover

15. . . light source

16. . . Light guide

17. . . Optical diaphragm

20. . . Light source structure

twenty one. . . framework

twenty two. . . Light guide strip

twenty three. . . Side cover

30. . . Tempered glass

301. . . Effective area

40. . . Light sensor

50. . . Display module

51. . . shell

52. . . support

53. . . Display panel

54. . . Back cover

55. . . light source

56. . . Light guide

57. . . Optical diaphragm

60. . . framework

601. . . Effective area

70. . . Light guide strip

80. . . Side cover

81. . . Bevel

90. . . Light sensor

A. . . Angle

L. . . Light-emitting diode

Figure 1 shows a top view of a conventional touch screen structure;

Figure 2 is a cross-sectional view taken along the line X1-X2 in Figure 1;

3 is a top view showing a structure of a touch screen according to an embodiment of the present invention;

Figure 4 is a cross-sectional view taken along the line X3-X4 in Figure 3;

Figure 5 is a schematic view showing the light guide bar, the side cover, the photo sensor, and the light emitting diode being coupled to the frame;

Figure 6 is a cross-sectional view showing the structure of a touch screen according to another embodiment of the present invention;

Figure 7 is a cross-sectional view showing the structure of a touch screen according to another embodiment of the present invention;

Figure 8 is a cross-sectional view showing the structure of a touch screen according to another embodiment of the present invention;

9 is a schematic view showing a manufacturing method of a touch screen structure according to an embodiment of the present invention;

FIG. 10 is a schematic view showing a manufacturing method of a touch screen structure according to another embodiment of the present invention.

50. . . Display module

60. . . framework

601. . . Effective area

80. . . Side cover

81. . . Bevel

90. . . Light sensor

A. . . Angle

Claims (12)

A touch screen structure includes: a display module; a rectangular frame disposed on the display module, wherein the frame has an opening corresponding to a sensing area of the touch screen structure; The light guiding strips are respectively disposed on the plurality of sides of the frame for guiding a light to the sensing area; a plurality of light sensors are fixed on the frame for detecting the sensing The light in the area; and a plurality of side covers fixed on the frame and corresponding to the light guiding strips, wherein the light passes through the side covers into the sensing area, and the side covers respectively have a bevel, an angle formed between the inclined faces of the adjacent side covers, wherein the included angle is between 60° and 89°. The touch screen structure of claim 1, wherein the display module further comprises a casing and a display panel, the casing is disposed around the display panel and connected to the side covers. The touch screen structure of claim 2, wherein the outer casing is integrally formed with the side covers. The touch screen structure of claim 1, wherein the display module further comprises a casing, a bracket and a display panel, the casing connecting the side covers and the bracket, the display panel being disposed on the bracket Upper, wherein the outer casing is integrally formed with the side covers. The touch screen structure of claim 1, wherein the frame and the side covers respectively have a U-shaped cross section, and the frame is received in the side covers. The touch screen structure of claim 1, wherein the display module further comprises a casing and a display panel, the casing is disposed around the display panel and connected to the frame. The touch screen structure of claim 6, wherein the outer casing is integrally formed with the frame. The touch screen structure of claim 1, wherein the display module further comprises a casing, a bracket and a display panel, the casing connecting the frame and the bracket, and the display panel is disposed on the bracket Upper, wherein the outer casing is integrally formed with the frame. The touch screen structure of claim 1, wherein the frame further comprises at least one light source, the light source providing the light. A method for manufacturing a touch screen structure includes: providing a rectangular frame, wherein the frame has an opening corresponding to a sensing area of the touch screen structure; and providing a plurality of light guiding strips respectively disposed on the a plurality of sides of the frame for guiding a light to the sensing area; providing a plurality of light sensors, and combining the light sensors on the frame for detecting the light Providing a display module, wherein the display module has a casing and fixing the frame to the casing; and providing a plurality of side covers fixed to the frame and corresponding to the light guiding strips, wherein The light passes through the side covers and enters the sensing area, and the side covers respectively have a sloped surface, and an adjacent angle is formed between the inclined surfaces of the side covers, wherein the angle is between 60° and 89 ° between. The system of the touch screen structure as described in claim 10 The method, wherein the frame and the side covers respectively have a U-shaped cross section, and the frame is received in the side covers, and the side covers are connected to the outer casing to fix the frame On the outer casing. The method for manufacturing a touch screen structure according to claim 10, wherein the method further comprises: providing at least one light source disposed in the frame to provide the light.