TWI408588B - Positioning method of lighting projector and optical touch apparatus - Google Patents

Abstract

A positioning method of lighting projector includes the steps of disposing a dual-wavelength lighting projector on a lighting source area of a touch panel, which has a visible light laser diode and a invisible light laser diode; driving the visible light laser diode of the dual-wavelength lighting projector for generating visible light; correcting the dual-wavelength lighting projector on a suitable position of the lighting source area for making visible light aim at a mark; disabling the visible light laser diode of the dual-wavelength lighting projector for breaking off visible light. The present invention further discloses an optical touch apparatus included a dual-wavelength lighting projector.

Description

Light source emitter positioning method and optical touch device

An optical touch device and a light source transmitter positioning method, in particular, a positioning technology for assembling an optical touch device.

Resistive or capacitive touch devices require an additional film process that will affect the transparency of the panel. At the same time, the conventional optical touch device utilizes light to detect the position of the touch panel surface to be touched by the finger, so that the transparent performance of the panel is not affected, and the touch device can be more resistant than the above-mentioned resistive or capacitive touch device. Good visual effects.

The principle of the conventional optical touch device 1 is to detect the shadow formed by the approaching object through the CCD/CMOS sensor at two corners, and find the position of the touch through the triangular positioning.

Please refer to the first figure. The first figure is a schematic diagram of components of a conventional optical touch device. The conventional optical touch device 1 includes a touch panel 10, two light source emitters 11a and 11b, and two CCD/CMOS sensors 13a and 13b. The surface of the touch panel 10 has a touch area 102. The two light source emitters 11a and 11b are oppositely disposed at opposite corners of the touch panel 10, and the light source emitters 11a and 11b continuously project a scattered light 110a, 110b. Covering the surface of the touch area 102. The two CCD/CMOS sensors 13a, 13b are respectively disposed adjacent to the light source emitters 11a, 11b at the opposite ends of the touch panel 10 to detect the shadow formed by the approaching object, and then through the triangular positioning. Find the location of the touch S1.

In order to maintain the transparency of the touch panel 10, the conventional optical touch device 1 generally employs a laser diode capable of emitting non-visible light as the light source emitters 11a, 11b. However, the implementation of the non-visible laser diodes as the light source emitters 11a, 11b takes a considerable time to complete the positioning of the light source emitters 11a, 11b, which seriously affects the efficiency of assembly, resulting in a relatively high Labor costs.

In view of the above, the present invention provides a method for positioning a light source emitter, which uses a visible light line emitted by a dual-wavelength light source emitter to align a predetermined mark as a dual-wavelength light source emitter positioned in an optical touch device. Therefore, the purpose of improving the efficiency and quality of the optical touch device assembly is achieved.

The optical touch device of the embodiment of the invention comprises a touch panel and a dual-wavelength light source emitter. The touch panel has a touch area, a light source setting area and a positioning mark. The dual-wavelength light source emitter is disposed in the light source setting area of the touch panel, and the dual-wavelength light source emitter has a visible light laser diode and a non-visible light laser diode, wherein the non-visible laser diode The visible light laser diode is used to generate one of the alignment marks, and the visible light laser diode is used to generate one of the visible light lines of the alignment mark.

The method for positioning a light source emitter according to an embodiment of the present invention includes the steps of: firstly providing a dual-wavelength light source emitter having a visible light laser diode and a non-visible light laser diode, and placing the dual-wavelength light source emitter On a light source setting area of a touch panel. Next, the visible light laser diode of the dual wavelength light source emitter is driven to emit a visible light line. Then, the dual-wavelength light source emitter is calibrated at an appropriate position on the light source setting area, and the visible light is aligned with one of the touch panel positioning marks. Finally, the visible light laser diode of the dual-wavelength light source emitter is disabled, so that the visible light laser diode cannot emit visible light.

In summary, the light source emitter positioning method disclosed in the embodiment provides the light source visible to the assembler as a basis for determining the position of the light source emitter in the optical touch device. In this way, the embodiment can enable the light source emitter to achieve the purpose of positioning more accurately and quickly, and at the same time, the convenience of assembling the optical touch device is improved, and the labor cost is reduced.

However, in order to be able to fully and fully disclose the present invention, and to exemplify the preferred embodiments, the following description will be described in detail with reference to the accompanying drawings:

Please refer to the second picture. The second figure discloses a schematic structural view of a dual-wavelength light source emitter before and after positioning according to an embodiment of the present invention. The optical touch device 2a of the present embodiment includes a touch panel 20 and a dual-wavelength light source emitter 21. The touch panel 20 has a touch area 202, a light source setting area 204, and a positioning mark 206. At the same time, the dual-wavelength light source emitter 21 is disposed in the light source setting area 204 of the touch panel 20 . In the foregoing, the light source setting area 204 may be any one of the periphery of the touch panel 20 . In practice, a two-wavelength light source emitter 21 is respectively disposed at two corners of the optical touch device 2a.

It is worth mentioning that a general optical touch device is usually disposed on two corresponding corners of the touch panel by two CCD/CMOS sensors, and adjacent to a light source emitter respectively. Therefore, the optical touch device 2a of the present invention also utilizes two CCD/CMOS sensors 29 adjacent to the corresponding dual-wavelength light source emitter 21. The CCD/CMOS sensor 29 detects the shadow formed by the approaching object, and performs a triangulation calculation on the detection result to determine the position of the touch panel 202 of the touch panel 20 to accept the touch, thereby achieving the purpose of the touch. .

Referring to the third figure, the third figure is a schematic structural view of a dual-wavelength light source emitter according to an embodiment of the present invention. The dual-wavelength light source emitter 21 has a visible light laser diode 210 and a non-visible laser diode 212, and two control pins (LD1, LD2) and a ground pin (G) are externally disposed. When the control pin LD1 is enabled, the visible light laser diode 210 is used to generate a visible light line P1, and when the control pin LD2 is enabled, the non-visible light laser diode is enabled. 212 is used to generate a non-visible line P3. The visible light line P1 and the non-visible light line P3 are mutually parallel light rays, and the distance between the two is very small, and is about 3 mm. In the foregoing, the non-visible light line P3 may be infrared light or ultraviolet light.

For the second and third figures, please refer to the fourth picture. The fourth figure is a schematic diagram of a positioning process of a light source emitter according to an embodiment of the present invention. First, the dual-wavelength light source emitter 21 is disposed on the light source setting area 204 of the touch panel 20 (S10). Next, the dual-wavelength light source emitter 21 is enabled to generate a visible light line P1 (S11). Then, the dual-wavelength light source emitter 21 is corrected at an appropriate position on the light source setting area 204 (S12). Next, it is judged whether or not the visible light line P1 is aligned with the positioning mark 206 (S13). If the visible light line P1 (indicated by the dotted line) has not been aligned with the positioning mark 206, it is necessary to return to step S12 to correct the position of the dual-wavelength light source emitter 21 placed on the light source setting area 204 again, so that the dual-wavelength light source emitter is enabled. The visible light line P1 emitted by the 21 can be aligned with the positioning mark 206 of the touch panel 20 as shown in the second figure.

When the visible light line P1 (solid line indication) is aligned with the positioning mark 206, the assembler can position the dual-wavelength light source emitter 21 at an appropriate position of the light source setting area 204 (S14). Finally, the assembler can short-circuit or float the control pin LD1 of the dual-wavelength light source emitter 21 to disable the visible light laser diode 210 in the dual-wavelength light source emitter 21. It is rendered incapable of emitting visible light P1 (S15).

After step S15, if the control pin LD2 of the dual-wavelength light source emitter 21 is enabled, the non-visible light line P3 generated by the non-visible light laser diode 212 in the dual-wavelength light source emitter 21 will The alignment mark 206 is aligned as a light source when the optical touch device 2a operates.

In this manner, the visible light P1 emitted by the dual-wavelength light source emitter 21 is aligned with the preset positioning mark 206 as a basis for the dual-wavelength light source emitter 21 to be positioned in the optical touch device 2a, thereby improving the optical. The purpose of efficiency and quality when assembling the touch device 2a.

Refer to the second and third figures. In the step of correcting the appropriate position (S12) of the dual-wavelength light source emitter 21 on the light source setting region 204, if the position set by the dual-wavelength light source emitter 21 is deviated, the emitted visible light P1 (dotted line indicates An error angle θ is generated between the horizontal plane of the touch panel 20 and the non-parallel state formed therebetween, so that the visible light line P1 cannot be aligned with the positioning mark 206. In addition, if the visible light line P1 (marked by the solid line) emitted by the dual-wavelength light source emitter 21 is aligned with the positioning mark 206, it means that there is no error angle θ between the visible light line P1 and the horizontal plane of the touch panel 20. A parallel state is formed in which the dual-wavelength light source emitter 21 is in an appropriate position on the light source setting area 204.

For the third picture, please refer to the fifth picture A. FIG. 5A is a schematic structural view of a dual-wavelength light source emitter according to another embodiment of the present invention. The main difference between the dual-wavelength light source emitter 23 and the dual-wavelength light source emitter 21 shown in the third figure is that the dual-wavelength light source emitter 23 has a diffusing element 231. The astigmatism element 231 is combined with the dual-wavelength light source emitter 21 shown in the third figure to form a dual-wavelength light source emitter 23 as shown in FIG.

With reference to the fifth A picture, refer to the fifth B picture. Figure 5B is a schematic diagram of the light intensity distribution of the dual-wavelength light source emitter of Figure 5A. As shown in FIG. 5B, the visible light P1 and the non-visible light P3 emitted by the dual-wavelength light source emitter 21 exhibit the strongest intermediate light intensity, and the light intensity gradually decreases from the middle portion to the both sides. Gaussian distribution), such a visible light P1 and a non-visible light P3 with a Gaussian distribution will seriously affect the light sensing capability of the optical touch device, resulting in malfunction.

Therefore, in order to solve the case where the light emitted by the dual-wavelength light source emitter 21 has a Gaussian distribution, the present invention integrates the astigmatism element 231 and the dual-wavelength light source emitter 21 into a dual-wavelength light source emitter 23 as shown in FIG. Thus, the visible light P1 and the non-visible light P3 having a Gaussian distribution pass through the astigmatism element 231, and then become a visible scattered light P2 and a non-visible scattered light P4 which are not Gaussian.

Refer to Figure 5A again. When the control pin LD1 is enabled, the visible light laser diode 210 is used to generate the visible light P1. At this time, the astigmatism element 231 is used to refract the visible light P1 to form visible scattered light P2. In addition, when the control pin LD2 is enabled, the non-visible laser diode 212 is used to generate the non-visible light line P3. At this time, the astigmatism element 231 is used to refract the non-visible light line P3 to form a non-visible line. Scattered light P4. In the foregoing, the scattered light P2 and the scattered light P4 are mutually parallel rays, and the distance between them is very small, and is about 3 mm.

For the fifth A picture, please refer to the sixth picture. FIG. 6 is a schematic view showing the structure of the dual-wavelength light source emitter before and after positioning according to another embodiment of the present invention. The difference between the optical touch device 2b of the present embodiment and the optical touch device 2a shown in the second embodiment is that the dual-wavelength light source emitter 23 used in the optical touch device 2b of the present embodiment has a astigmatism element 231. In the initial stage of positioning, the dual wavelength source emitter 23 is first enabled to produce visible scattered light P2.

Then, the dual-wavelength light source emitter 23 is corrected at an appropriate position on the light source setting area 204. Next, it is judged whether or not the visible scattered light P2 is aligned with the positioning mark 206. If the visible scattered light P2 (indicated by the dashed line) has not been aligned with the positioning mark 206, the position of the dual-wavelength light source emitter 23 placed on the light source setting area 204 is corrected again, so that the dual-wavelength light source emitter 23 emits The visible scattered light P2 (solid line indication) can be aligned with the positioning mark 206 of the touch panel 20, as shown in the sixth figure.

Finally, the assembler can short-circuit or float the control pin LD1 of the dual-wavelength light source emitter 23 to disable the dual-wavelength light source emitter 23 from emitting visible scattering. Light P2.

When the optical touch device 2b is activated, if the control pin LD2 of the dual-wavelength light source emitter 23 is enabled, the non-visible scattered light P4 generated by the dual-wavelength light source emitter 23 (as shown in FIG. The display will cover the touch area 202 of the touch panel 20 and align the positioning mark 206 to serve as a light source when the optical touch device 2b is operated.

Refer to the sixth picture. The optical touch device 2b of the present embodiment further includes a CCD/CMOS sensor 29 disposed on the light source setting area 204 of the touch panel 20 and adjacent to the dual-wavelength light source emitter 23. Thus, when the user approaches the touch area 202 of the touch panel 20, the CCD/CMOS sensor 29 is used to detect the shadow formed by the approaching object.

It is worth mentioning that a general optical touch device is usually disposed on two corresponding corners of the touch panel by two CCD/CMOS sensors, and adjacent to a light source emitter respectively. Therefore, the optical touch device 2b of the present invention also uses two CCD/CMOS sensors 29 to simultaneously detect the shadow formed by the approaching object, and performs a triangulation calculation on the detection result to determine the touch panel. The surface of the touch area 202 of 20 accepts the touched position to achieve the purpose of touch.

Please refer to FIG. 7A, which is a perspective view of a astigmatism element according to an embodiment of the present invention. The astigmatism element 231a of this embodiment may have a curved surface, and the non-visible scattered light P4 emitted by the dual-wavelength light source emitter 23a having the astigmatism element 231a is linear (as shown in FIG. 7B). The remaining component compositions and embodiments are equivalent to the above embodiments.

Please refer to FIG. 8A, which is a perspective view of a astigmatism element according to another embodiment of the present invention. The astigmatism element 231b of the present embodiment has a plurality of side-by-side curved surfaces, and the non-visible scattered light P4 emitted by the dual-wavelength light source emitter 23b having the astigmatism element 231b has a dotted line shape (as shown in FIG. 8B). The remaining component compositions and implementations are equivalent to the above embodiments.

Please refer to FIG. 9A, which is a perspective view of a astigmatism element according to still another embodiment of the present invention. The astigmatism element 231c of this embodiment is a Powell lens. The non-visible scattered light P4 emitted by the dual-wavelength light source emitter 23c having the astigmatism element 231c is linear (as shown in FIG. BB), and the remaining component compositions and embodiments are equivalent to the above embodiment. In addition, in order to solve the problem of Gaussian distribution, the present invention can further utilize an element such as a diffractive element (DOE), a beam shape element (Beam Shape) or a micro lens (Micro Lens) as an application embodiment of the astigmatism element.

In summary, the light source emitter positioning method disclosed in the embodiment provides the light source visible to the assembler as a basis for determining the position of the light source emitter in the optical touch device. In this way, the embodiment can enable the light source emitter to achieve the purpose of positioning more accurately and quickly, and at the same time, the convenience of assembling the optical touch device is improved, and the labor cost is reduced.

However, the above description is only a detailed description of the specific embodiments of the present invention, and any one skilled in the art can easily conceive changes or modifications in the field of the present invention. The scope of the patent in this case below.

Convention:

1. . . Optical touch device

10. . . Touch panel

11a, 11b. . . Light source emitter

13a, 13b. . . CCD/CMOS sensor

102. . . Touch area

110a, 110b. . . Scattered light

S1. . . Touch position

this invention:

2a, 2b. . . Optical touch device

20. . . Touch panel

202. . . Touch area

204. . . Light source setting area

206. . . Positioning mark

θ. . . Error angle

21, 23. . . Dual wavelength light source transmitter

210. . . Visible light laser diode

212. . . Non-visible laser diode

LD1, LD2. . . Control pin

G. . . Grounding pin

P1. . . Visible light

P3. . . Non-visible light

23, 23a, 23b, 23c. . . Dual wavelength light source transmitter

231, 231a, 231b, 231c. . . Astigmatic component

P2. . . Visible scattered light

P4. . . Non-visible scattered light

29. . . CCD/CMOS sensor

The first figure is a schematic diagram of components of a conventional optical touch device;

The second figure is a schematic structural view of a dual-wavelength light source transmitter before and after positioning according to an embodiment of the present invention;

The third figure is a schematic structural view of a dual-wavelength light source transmitter according to an embodiment of the present invention;

The fourth figure is a schematic diagram of a positioning process of a light source transmitter according to an embodiment of the present invention;

5A is a schematic structural view of a dual-wavelength light source transmitter according to another embodiment of the present invention;

Figure 5B is a schematic diagram showing the light intensity distribution of the dual-wavelength light source emitter of Figure 5A;

FIG. 6 is a schematic structural view showing the front and rear of a dual-wavelength light source transmitter according to another embodiment of the present invention;

7A is a perspective view of a astigmatism element according to an embodiment of the present invention;

Figure 7B is a schematic view showing the use of the astigmatism element of Figure 7 to emit linear scattered light;

8A is a perspective view of a astigmatism element according to another embodiment of the present invention;

Figure 8B is a schematic view showing the use of the astigmatism element of Figure 8 to emit scattered light in a dotted line;

9A is a perspective view of a astigmatism element according to still another embodiment of the present invention; and

Figure IX is a schematic view showing the use of the astigmatism element of Figure 9 to emit linearly scattered light.

The representative diagram is a flow chart, so there is no component symbol.

Claims (10)

A method for positioning a light source emitter of an optical touch device comprises the steps of: placing a dual-wavelength light source emitter having a visible light laser diode and a non-visible light laser diode on a light source of a touch panel a visible light laser diode for driving the dual-wavelength light source emitter to emit a visible light line; correcting the dual-wavelength light source emitter at an appropriate position on the light source setting area, and causing the visible light pair Positioning the mark on one of the touch panels; and disabling the visible light laser diode of the dual-wavelength light source emitter, so that the visible light laser diode cannot emit the visible light. The light source emitter positioning method of the optical touch device of claim 1, wherein the dual-wavelength light source emitter has an astigmatism element that refracts the visible light to form a visible scattered light to The positioning mark of the touch panel. The method for locating a light source emitter of an optical touch device according to claim 1 is to use a short-circuit or floating one of the dual-wavelength light source emitters to control the foot position to disable ( Disable) The visible laser diode. An optical touch device includes: a touch panel having a touch area, a light source setting area, and a positioning mark; and a dual-wavelength light source emitter disposed on the light source of the touch panel a dual-wavelength light source emitter having a visible light laser diode and a non-visible light laser diode, wherein the visible light laser diode is used to generate a visible light line aligned with the positioning mark, and After the visible light line is aligned with the positioning mark, one of the non-visible light lines generated by the non-visible light laser diode will be aligned with the positioning mark. The optical touch device of claim 4, wherein the non-visible light is infrared or ultraviolet light. The optical touch device of claim 4, wherein the light source setting area is any one of the periphery of the touch panel. The optical touch device of claim 6, further comprising an astigmatism component coupled to the dual-wavelength light source emitter to form a scattered light to cover the touch area. The optical touch device of claim 7, wherein the astigmatism element refracts the visible light to form visible scattered light for aligning the positioning mark of the touch panel, and refracting the non-visible light line. The scattered light that is not visible is formed. The optical touch device of claim 7, further comprising a CCD/CMOS sensor disposed in the light source setting area of the touch panel adjacent to the dual wavelength Light source transmitter. The optical touch device of claim 7, wherein the astigmatism element has a curved surface; or the astigmatism element has a plurality of side-by-side curved surfaces; or the astigmatism element It is a Powell lens, a diffraction element (DOE), a Beam Shape element or a Micro Lens.