WO2021052027A1

WO2021052027A1 - Light guide strip and touch display device

Info

Publication number: WO2021052027A1
Application number: PCT/CN2020/105913
Authority: WO
Inventors: 陈玉香
Original assignee: 广州创知科技有限公司
Priority date: 2019-09-17
Filing date: 2020-07-30
Publication date: 2021-03-25
Also published as: CN210514678U

Abstract

Provided are a light guide strip (100) and a touch display device. The light guide strip (100) is provided with a first refracting surface (110), a second refracting surface (120), a third refracting surface (130) and a fourth refracting surface (140), wherein the second refracting surface (120) and the third refracting surface (130) are located between the first refracting surface (110) and the fourth refracting surface (140); an intersection point of the first refracting surface (110), or an extension line thereof, and the second refracting surface (120), or an extension line thereof, is located on a first side, and an intersection point of the third refracting surface (130), or an extension line thereof, and the fourth refracting surface (140), or an extension line thereof, is located on a second side; and a connecting line between the midpoint of the first refracting surface (110) and the midpoint of the fourth refracting surface (140) is taken as a reference line (200), and the first side and the second side are respectively located on two opposite sides of the reference line (200). The light guide strip (100) changes the trajectory of light rays, so that an infrared lamp (600) of a touch display device can still meet the requirements of a touch writing height under the condition where the distance between the infrared lamp and the surface of a glass screen (400) is relatively small, and the height of a frame (500) where the infrared lamp (600) is mounted can be reduced.

Description

Light guide bar and touch display device

This application claims the priority of the patent application filed to the State Intellectual Property Office of China on September 17, 2019 with the application number 201921547208.X and the invention title "light guide strip and touch display device".

Technical field

This application relates to the field of display devices, more specifically, a light guide bar and touch display device.

Background technique

An infrared touch display device is a touch device that uses a dense infrared matrix in the X and Y directions to detect and locate touch operations. In the existing touch display device, the infrared light emitted by the infrared lamp is generally located on the front side of the glass screen through the light guide strip. After the infrared light passes through the light guide strip, its height from the glass screen surface is basically unchanged. The height of the rear infrared light can meet the writing height on the glass screen. The center line of the lamp bead of the infrared lamp generally has a relatively high distance from the surface of the glass screen. In the process of realizing the present invention, the inventor found that the prior art has The distance between the center line of the lamp bead and the surface of the glass screen is relatively high, which results in a higher height of the frame for installing the infrared lamp from the surface of the glass screen.

Summary of the invention

The purpose of this application is to provide a light guide strip and a touch display device. The light guide strip changes the trajectory of light so that the infrared lamp of the touch display device can still meet the touch writing height even when the distance from the glass screen surface is low. It can reduce the height of the frame where the infrared lamp is installed.

The technical scheme is as follows:

This application discloses a light guide strip.

The light guide strip has a first refraction surface, a second refraction surface, a third refraction surface and a fourth refraction surface, the second refraction surface and the third refraction surface are located between the first refraction surface and the fourth refraction surface, The intersection of the first refraction surface or its extension line and the second refraction surface or its extension line is located on the first side, and the third refraction surface or its extension line and the fourth refraction surface or its extension line are The intersection is located on the second side, and the line connecting the midpoint of the first refraction surface and the midpoint of the fourth refraction surface is taken as the reference line, and the first side and the second side are respectively located opposite to the reference line On both sides.

The first side is located on the back side of the reference line, and the second side is located on the front side of the reference line.

The angle formed by the intersection of the first refraction surface or its extension line and the second refraction surface or its extension line is α, and the third refraction surface or its extension line and the fourth refraction surface or its extension The angle formed after the lines intersect is β, and the angle difference between the angle α and the angle β is 0 to 20 degrees.

The angle α is equal to the angle β.

The light guide strip further has a first mounting surface and a second mounting surface, and the first mounting surface and the second mounting surface are respectively located on both sides of the reference line.

The first refraction surface intersects the first mounting surface, and the included angle between the first refraction surface and the extension line of the first mounting surface is less than 90 degrees.

The included angle between the first refraction surface and the extension line of the first mounting surface is 30 degrees to 60 degrees.

The fourth refraction surface intersects the first mounting surface, and the included angle between the fourth refraction surface and the first mounting surface is 70 degrees to 90 degrees.

The first refraction surface, the first mounting surface, the fourth refraction surface, and the second mounting surface are sequentially connected to form a ring structure.

The application also discloses a touch display device.

The touch display device includes a display module, a glass screen, a frame, an infrared lamp, and the light guide strip as described above. The display module and the glass screen are installed on the frame, and the display module The group is located on the back side of the glass screen, the infrared lamp is fixed on the frame, and is located on the front side of one side of the glass screen, the light guide strip is fixed on the frame, and the guide The light bar is located on the light transmission channel of the infrared lamp, and the first refraction surface is close to the infrared lamp.

The light guide strip is provided with a fixing groove, the frame is provided with a protruding part, the protruding part matches the fixing groove, and the light guide strip passes through the fixing groove and the protruding part Fixed with the frame.

The light guide strip abuts against the glass screen.

The frame has at least a first side and a second side. The first side is opposite to the second side. Both the first side and the second side are provided with infrared lamps and The light guide strip, the first side edge corresponds to the infrared lamp on the second side edge, the infrared lamp on one of the first side edge and the second side edge is an infrared emitting lamp, and the other The infrared light on one side is an infrared receiving light.

It should be noted:

The aforementioned "first, second, third..." are only used to distinguish names, and do not represent specific quantities and sequences.

The aforementioned "front side" refers to the side of the touch display device that is close to the viewer in front of the display screen, and the "rear side" is the other side opposite to the "front side";

The advantages or principles of this application are described below:

1. The light guide strip includes a first refraction surface, a second refraction surface, a third refraction surface, and a fourth refraction surface. The second refraction surface and the third refraction surface are located between the first refraction surface and the fourth refraction surface. Since light is refracted when entering a different medium from one medium, if the first refraction surface is the incident surface of the light, the light enters the light guide through the first refraction surface, and the light is refracted by the first refraction surface. Enter the light guide, then the light enters the second refraction surface, the light passes through the second refraction surface and then refracts again, then the light enters the third refraction surface, the light passes through the third refraction surface and then refracts again, and then the light enters the first refraction surface. Four refraction surfaces, the light is emitted from the light guide bar after being refracted by the fourth refraction surface. After the light passes through the first refraction surface, the second refraction surface, the third refraction surface, and the fourth refraction surface, the trajectory of the light is shifted. The light entering the first refraction surface is different from the light exiting the fourth refraction surface after being refracted. The height of the trajectory of the light is changed, and the trajectory height of the light emitted from the light guide strip becomes higher or lower than that of the light entering the light guide strip.

If the fourth refraction surface is the incident surface of the light, the light is refracted by the fourth refraction surface, the third refraction surface, the second refraction surface and the first refraction surface, and then exits from the first refraction surface, and the light entering the fourth refraction surface and After refraction, the trajectory height of the light emitted from the first refraction surface is changed compared to the trajectory height of the light, and the trajectory height of the light emitted from the light guide strip becomes higher or lower than that of the light entering the light guide strip.

The intersection of the first refraction surface or its extension and the second refraction surface or its extension is on the first side, the intersection of the third refraction surface or its extension and the fourth refraction surface or its extension is on the second side, and One side and the second side are respectively located on opposite sides of the reference line. The first refraction surface and the second refraction surface form a triangular, trapezoidal or quadrilateral cross-section structure on the light guide strip, and the third refraction surface and the fourth refraction surface form a triangular, trapezoidal or trapezoidal cross-section on the light guide strip. A quadrilateral structure similar to a trapezoid. The first side and the second side are located on opposite sides of the reference line. One of the two triangles formed is an upright triangle and the other is an inverted triangle. Of the two quadrilaterals formed, one is an upright triangle. Trapezoid, the other is an inverted trapezoid, the light is deflected and emitted in the same direction after being refracted by the first and second refraction surfaces, and the light is deflected in the same direction after being refracted by the third and fourth refraction surfaces It is emitted, and the deflection direction of the light after being refracted by the first and second refraction surfaces is opposite to the deflection direction after being refracted by the third and fourth refraction surfaces. When the height of the ray trajectory changes after the light passes through the light guide strip, the third and fourth refraction surfaces correct the direction of exit of the light after being refracted by the first refraction surface and the second refraction surface, or the first refraction surface And the second refraction surface for correcting deviation of the exit direction of the light rays refracted by the third refraction surface and the fourth refraction surface.

2. The first side and the second side are respectively located on opposite sides of the reference line, so that the light refracted by the first and second refraction surface and the light refracted by the third refraction surface and the fourth refraction surface are directed to the reference The direction of the opposite sides of the line is shifted. After the light passes through the first refraction surface and the second refraction surface, the exit direction of the light is shifted relative to the direction of the light incident on the first refraction surface. The light passes through the third refraction surface, The fourth refracting surface corrects the exit direction of the shifted light. Or after the light passes through the fourth refraction surface and the third refraction surface, the exit direction of the light is shifted relative to the direction of the light entering the fourth refraction surface, and the light is shifted after passing through the second refraction surface and the first refraction surface. The direction of light emission is corrected.

3. The first side is located on the back side of the reference line, and the second side is located on the front side of the reference line. The cross section formed on the light guide strip between the first refraction surface and the second refraction surface is an inverted triangle or an inverted trapezoid. , The cross section formed by the third refraction surface and the fourth refraction surface on the light guide strip is an upright triangle or an upright trapezoid. According to the law of refraction, the refracted light and the incident light lie on both sides of the normal. When the light enters a medium with a high speed of light, the angle of refraction is less than the angle of incidence. When a medium with a low speed of light enters a medium with a high speed of light, The angle of refraction is greater than the angle of incidence. If the first refraction surface is the incident surface, the light is refracted by the first refraction surface and the second refraction surface, and then the light is deflected and emitted in the direction of the second side, and passes through the first refraction surface, the second refraction surface, the third refraction surface, The light refracted by the fourth refraction surface is shifted to the second side relative to the light incident from the first refraction surface, and the light emitted from the fourth refraction surface moves relative to the light incident from the first refraction surface. The trajectory becomes higher. If the fourth refraction surface is the incident surface, the light is refracted by the fourth refraction surface and the third refraction surface, and then the light is deflected and emitted in the direction of the first side, and passes through the fourth refraction surface, the third refraction surface, the second refraction surface, The light behind the first refracting surface has a lower height relative to the trajectory of the light incident from the fourth refracting surface.

4. After the first refraction surface or its extension line intersects with the second refraction surface or its extension line, the cross section formed is an inverted triangle. After the third refraction surface or its extension line intersects the fourth refraction surface or its extension line, The formed cross-section is an upright triangle, and the light guide strip has the function of guiding light. The structure with two triangular cross-sections is similar to two prisms. In a prism, the deflection angle is related to the refractive index of the prism, the apex angle of the prism, and the prism. The angle of incidence is related. In this application, the refractive index of the light guide strip is fixed, and the deflection angle of the light is related to the apex angle of the two triangles and the incident angle of the light. If the angle α and the angle β are equal, the cross section is an inverted triangle. The apex angle of is the same as the apex angle of a triangle whose cross-section is upright. Only the incident angle of the light needs to be controlled to correct the deviation of the offset light.

5. The angle between the first refraction surface and the extension of the first mounting surface is less than 90 degrees, preferably 30 degrees to 60 degrees, and the light is parallel to the first mounting surface and enters the light guide from the first refraction surface. In the case of striping, the angle between the incident light and the first refracting surface is less than 90 degrees, preferably 30 degrees to 60 degrees. Since light is refracted when entering a different medium from one medium, when light enters a medium with a high speed of light into a medium with a low speed of light, the angle of refraction is less than the angle of incidence, and the propagation speed of light in the air is greater than that in the light guide. The speed of propagation in the bar. When the light enters the light guide from the first refraction surface parallel to the direction of the first mounting surface, the incident angle between the incident light and the normal of the first refraction surface is less than 90 degrees, and the light is refracted by the first refraction surface. The angle of refraction is smaller than the angle of incidence, and the light can only be shifted toward the second side, so that the light refracted by the first refraction surface shifts toward the second side with respect to the incident light, and the trajectory of the light becomes higher. The angle between the first refraction surface and the extension line of the first installation surface is limited so that the light rays refracted by the first refraction surface will not deviate from the light guide bar.

6. The angle between the fourth refraction surface and the first mounting surface is 70 degrees to 90 degrees. After the light passes through the first refraction surface and the second refraction surface, the exit direction of the light is relative to the first refraction surface and the second refraction surface. The incident direction of the two refraction surfaces is shifted to the direction of the second side, and the exit direction of the light after the light passes through the third refraction surface and the fourth refraction surface is relative to the incident direction of the third refraction surface and the fourth refraction surface. The direction of the first side is shifted, and the exit direction of the light after passing through the third refraction surface is slightly shifted to the direction of the second side with respect to the incident direction of the light entering the first refraction surface, or is different from the direction of the first refraction. The incident directions of the light rays on the surface are approximately parallel. When light enters a medium with a high speed of light from a medium with a low speed of light, the angle of refraction is greater than the angle of incidence, and the angle between the fourth refracting surface and the first mounting surface is limited, so that the exit direction of the light after passing through the fourth refracting surface is relative to the incident The incident direction of the fourth refraction surface has a small deviation to the first side direction, ensuring that the exit direction of the light rays refracted by the fourth refraction surface is consistent with the incident direction of the light rays entering the first refraction surface.

7. The light guide strip also has a first mounting surface and a second mounting surface, and the light guide strip is mounted on the touch display device through the first mounting surface and the second mounting surface.

8. The first refraction surface of the light guide strip is close to the infrared lamp, the infrared light emitted by the infrared lamp enters the light guide strip through the first refraction surface, and the infrared light passes through the first refraction surface, the second refraction surface, the third refraction surface and the first refraction surface. After being refracted by the four refraction surfaces, the height of the infrared light emitted through the fourth refraction surface is changed relative to that of the infrared light entering through the first refraction surface, so that the height of the infrared light after passing through the light guide becomes higher, so that the infrared light It can still meet the requirements of touch writing height even when the installation position is very low. Or infrared light enters the light guide strip through the fourth refraction surface, and exits after being refracted by the fourth refraction surface, the third refraction surface, the second refraction surface and the first refraction surface. The light guide strip changes the movement trajectory of the infrared light to make The height of the infrared light after passing through the light guide bar is reduced, so that the infrared lamp can still receive the infrared light even when the installation position is very low.

9. The light guide strip is fixed on the frame through the fixing groove and the protruding part, the fixing method of the light guide strip and the frame is simple, and the installation of the light guide strip is simple and convenient.

10. The light guide strip is in contact with the glass screen. There is no gap between the light guide strip and the glass screen. Dust outside the touch display device will not enter the touch display device through the light guide strip and the glass screen. The entry of dust, etc., affects the touch sensitivity of the touch display device.

11. The frame has opposite first and second sides, and the infrared lamp on one side is an infrared emitting lamp, the infrared lamp on the other side is an infrared receiving lamp, and the infrared emitting lamp on one side emits The infrared light is located on the front side of the glass screen after passing through the light guide strip, and then the infrared light is received by the infrared receiving lamp after passing through the light guide strip on the other side, so that the infrared receiving lamp can still meet the requirements of touch writing even when the installation position is very low. .

Description of the drawings

FIG. 1 is a schematic diagram of a partial cross-sectional view of the touch display device of this embodiment;

Figure 2 is a partial perspective view of the light guide strip of this embodiment;

Figure 3 is a cross-sectional view of the light guide strip of this embodiment;

4 is a schematic diagram of the light trajectory of the light entering the light guide strip in this embodiment;

Description of reference signs:

100. Light guide strip; 110, first refraction surface; 120, second refraction surface; 130, third refraction surface; 140, fourth refraction surface; 150, first mounting surface; 160, second mounting surface; 200, Baseline; 400, glass screen; 500, frame; 600, infrared lamp; 700, infrared PCB board; 170, fixed slot.

detailed description

The embodiments of the present application will be described in detail below.

As shown in FIG. 2, this embodiment discloses a light guide strip 100. The light guide strip 100 has a first refraction surface 110, a second refraction surface 120, a third refraction surface 130, and a fourth refraction surface 140. The refraction surface 120 and the third refraction surface 130 are located between the first refraction surface 110 and the fourth refraction surface 140. The intersection of the first refractive surface 110 or its extension and the second refractive surface 120 or its extension is located on the first side, and the intersection of the third refractive surface 130 or its extension and the fourth refractive surface 140 or its extension is located on the second side. 3, the line connecting the midpoint of the first refraction surface 110 and the midpoint of the fourth refraction surface 140 is taken as the reference line 200, and the first side and the second side are respectively located on opposite sides of the reference line 200. side.

Since light is refracted when entering a different medium from one medium, if the first refraction surface 110 is the incident surface of the light, the light enters the light guide 100 through the first refraction surface 110, and the light passes through the first refraction. The surface 110 enters the light guide strip 100 after being refracted, then the light enters the second refraction surface 120, the light passes through the second refraction surface 120 and then refracts again, then the light enters the third refraction surface 130, and the light exits through the third refraction surface 130 After that, it is refracted again, and then the light enters the fourth refraction surface 140, and the light is refracted by the fourth refraction surface 140 and then exits the light guide strip 100. After the light passes through the first refraction surface 110, the second refraction surface 120, the third refraction surface 130, and the fourth refraction surface 140, the trajectory of the light is shifted. The light entering the first refraction surface 110 is different from the fourth refraction after being refracted. The light rays emitted from the surface 140 have a different trajectory height compared to the light rays. The light rays emitted from the light guide strip 100 have higher or lower trajectory heights relative to the light rays incident on the light guide strip 100.

If the fourth refraction surface 140 is the incident surface of the light, the light is refracted by the fourth refraction surface 140, the third refraction surface 130, the second refraction surface 120, and the first refraction surface 110 and then exits the first refraction surface 110. The trajectory height of the light entering the fourth refraction surface 140 and the light exiting the first refraction surface 110 after being refracted has changed. The light exiting from the light guide strip 100 is relative to the light entering the light guide strip 100. The height of its trajectory becomes higher or lower.

The cross section formed on the light guide strip 100 by the first refraction surface 110 and the second refraction surface 120 is a triangular, trapezoidal or quadrilateral structure similar to a trapezoid, and the third refraction surface 130 and the fourth refraction surface 140 are formed on the light guide strip 100 The cross section is triangular, trapezoidal or quadrilateral structure similar to trapezoid. Also, because the first side and the second side are located on opposite sides of the reference line 200, one of the two triangles is an upright triangle, and the other is an inverted triangle. Of the two quadrilaterals formed, one is a positive triangle. Vertical trapezoid, and the other inverted trapezoid.

The light is deflected and emitted in the same direction after being refracted by the first refraction surface 110 and the second refraction surface 120. The light is deflected and emitted in the same direction after being refracted by the third refraction surface 130 and the fourth refraction surface 140, and the light is deflected and emitted in the same direction after passing through the first refraction surface. The deflection direction after refracting by the first refraction surface 110 and the second refraction surface 120 is opposite to the deflection direction after being refracted by the third refraction surface 130 and the fourth refraction surface 140. While the height of the ray trajectory changes after the light passes through the light guide strip 100, the third refraction surface 130 and the fourth refraction surface 140 correct the exit direction of the light after being refracted by the first refraction surface 110 or the second refraction surface 120. Or the first refraction surface 110 and the second refraction surface 120 correct the exit direction of the light rays refracted by the third refraction surface 130 and the fourth refraction surface 140.

The first side and the second side are respectively located on opposite sides of the reference line 200. The light refracted by the first refraction surface 110 and the second refraction surface 120, and the light refracted by the third refraction surface 130 and the fourth refraction surface 140 It is shifted in the direction of the opposite sides of the reference line 200. After the light passes through the first refraction surface 110 and the second refraction surface 120, the exit direction of the light is shifted relative to the direction of the light incident on the first refraction surface 110, and the light passes through the third refraction surface 130 and the fourth refraction surface 140. Correct the exit direction of the shifted light. Or after the light passes through the fourth refraction surface 140 and the third refraction surface 130, the exit direction of the light is shifted from the direction of the light incident on the fourth refraction surface 140, and the light passes through the second refraction surface 120 and the first refraction surface 110. Correct the emission direction of the shifted light.

The first side is located on the back side of the reference line 200, and the second side is located on the front side of the reference line 200. The cross section formed on the light guide strip 100 between the first refraction surface 110 and the second refraction surface 120 is an inverted triangle or An inverted trapezoid, the cross section formed by the third refraction surface 130 and the fourth refraction surface 140 on the light guide strip 100 is an upright triangle or an upright trapezoid. According to the law of refraction, incident light and refracted light are located on both sides of the normal. When light enters a medium with a high speed of light, the angle of refraction is less than the angle of incidence, and when light enters a medium with a high speed of light from a medium with a low speed of light, The angle of refraction is greater than the angle of incidence. If the light enters through the first refraction surface 110, the light is refracted by the first refraction surface 110 and the second refraction surface 120, and then the light deviates and exits in the direction of the second side, and then passes through the first refraction surface 110 and the second refraction surface 120. The light refracted by the third refraction surface 130 and the fourth refraction surface 140 is shifted to the second side relative to the light incident from the first refraction surface 110, and the light emitted from the fourth refraction surface 140 is relative to the light from the first refraction surface. The height of the trajectory of the light incident from a refracting surface 110 becomes higher. If the fourth refraction surface 140 is the incident surface, the light is refracted by the fourth refraction surface 140 and the third refraction surface 130, and then the light deviates and exits in the direction of the first side, and then passes through the fourth refraction surface 140, the third refraction surface 130, and the third refraction surface 130. The light rays behind the second refraction surface 120 and the first refraction surface 110 have a lower moving track height relative to the light rays incident from the fourth refraction surface 140.

As shown in FIG. 3, the angle formed by the intersection of the first refraction surface 110 or its extension line and the second refraction surface 120 or its extension line is α, and the third refraction surface 130 or its extension line and the fourth refraction surface 140 or The included angle formed by the intersection of the extension lines is β, and the angle difference between the included angle α and the included angle β is 0 to 20 degrees, and the angle between the included angle α and the included angle β is preferably equal.

In this embodiment, after the first refraction surface 110 or its extension line intersects the second refraction surface 120 or its extension line, the cross section formed is an inverted triangle, the third refraction surface 130 or its extension line, and the fourth refraction surface After 140 or its extension lines intersect, the cross section formed is an erect triangle. The two triangular cross-section structures are similar to two prisms. In a prism, the deflection angle is related to the refractive index of the prism, the vertex angle of the prism, and the incident angle. The refractive index of the light guide strip 100 in this embodiment is fixed, the deflection angle of the light is related to the apex angle of the two triangles and the incident angle of the light, and because the angle α and the angle β are equal, the cross-section The apex angle of the inverted triangle is the same as the apex angle of the triangle whose cross-section is upright, and it is only necessary to control the incident angle of the light to correct the offset of the light.

As shown in FIG. 4, the light guide strip 100 also has a first mounting surface 150 and a second mounting surface 160. The first mounting surface 150 is parallel to the second mounting surface 160. The first refraction surface 110, the first mounting surface 150, and the second mounting surface 160 are parallel to each other. The four-refraction surface 140 and the second mounting surface 160 are sequentially connected to form a ring structure. The first mounting surface 150 and the second mounting surface 160 are respectively located on both sides of the reference line 200, and the light guide bar 100 is mounted on the touch display device or other devices through the first mounting surface 150 and the second mounting surface 160.

4, the first refraction surface 110 intersects the first mounting surface 150, the angle between the first refraction surface 110 and the extension of the first mounting surface 150 is α1, and the angle of α1 is less than 90 degrees, Preferably it is 30 degrees to 60 degrees. When the light enters the light guide strip 100 from the first refraction surface 110 in a direction parallel to the first mounting surface 150, the angle between the incident light and the first refraction surface 110 is less than 90 degrees, preferably 30 degrees to 60 degrees . Since light is refracted when entering a different medium from one medium, when light enters a medium with a high speed of light into a medium with a low speed of light, the angle of refraction is less than the angle of incidence, and the propagation speed of light in the air is greater than that in the light guide. The speed of propagation in bar 100. When the light enters the light guide strip 100 from the first refraction surface 110 parallel to the direction of the first mounting surface 150, the incident angle between the incident light and the normal of the first refraction surface 110 is less than 90 degrees, and the light passes through the first refraction. The angle of refraction after the surface 110 is refracted is smaller than the angle of incidence, and the light can only be shifted toward the second side, so that the light after being refracted by the first refraction surface 110 shifts toward the second side relative to the incident light. The movement trajectory becomes higher. At the same time, the angle between the first refraction surface 110 and the extension of the first installation surface 150 is limited so that the light refracted by the first refraction surface 110 will not deviate from the light guide strip 100.

The fourth refraction surface 140 also intersects the first mounting surface 150, the angle between the fourth refraction surface 140 and the first mounting surface 150 is β1, and the angle of β1 is 70 to 90 degrees. After the light passes through the first refraction surface 110 and the second refraction surface 120, the exit direction of the light deviates from the incident direction of the first refraction surface 110 and the second refraction surface 120 to the direction of the second side. The exit direction of the light after the third refraction surface 130 and the fourth refraction surface 140 is shifted to the first side relative to the incident direction of the third refraction surface 130 and the fourth refraction surface 140, and exits through the third refraction surface 130 The exit direction of the subsequent light is slightly shifted to the direction of the second side with respect to the incident direction of the light incident on the first refraction surface 110, or approximately parallel to the incident direction of the light incident on the first refraction surface 110. When light enters a medium with a high speed of light from a medium with a low speed of light, the angle of refraction is greater than the angle of incidence. The angle between the fourth refracting surface 140 and the first mounting surface 150 is limited, so that the exit direction of the light after passing through the fourth refracting surface 140 is opposite. The incident direction of the fourth refraction surface 140 has a small deviation to the first side direction, so that the incident direction of the light rays refracted by the fourth refraction surface 140 and the first refraction surface 110 are consistent.

When the fourth refraction surface 140 is the incident surface, the first refraction surface 110 is the exit surface, and the light enters the fourth refraction surface 140 in a direction parallel to the first mounting surface 150, the deviation direction of the light is opposite to the above, and the principle is the same , I won’t repeat it again.

As shown in FIG. 1, this embodiment also discloses a touch display device, which includes a display module (not shown in the figure), a glass screen 400, a frame 500, an infrared lamp 600, and the aforementioned guide Light strip 100. The display module and the glass screen 400 are installed on the frame 500, and the display module is located on the back side of the glass screen 400. The frame 500 is provided with an infrared PCB board 700 installation position, and an infrared PCB board 700 and an infrared lamp 600 are installed on the installation position. It is installed on the infrared PCB board 700, and the infrared lamp 600 is located on the front side of one side of the glass screen 400.

The light guide strip 100 is fixed on the frame 500, the light guide strip 100 is located on the light transmission channel of the infrared lamp 600, and the first refraction surface 110 is close to the infrared lamp 600. The infrared light emitted by the infrared lamp 600 enters the light guide strip 100 through the first refraction surface 110, and the infrared light is emitted after being refracted by the first refraction surface 110, the second refraction surface 120, the third refraction surface 130, and the fourth refraction surface 140. The height of the infrared light emitted through the fourth refraction surface 140 relative to the infrared light incident through the first refraction surface 110 is changed, so that the height of the infrared light after passing through the light guide strip 100 becomes higher, so that the infrared lamp 600 is installed It can still meet the requirements of touch writing height even when the position is very low. Or infrared light enters the light guide strip 100 through the fourth refraction surface 140, and exits after being refracted by the fourth refraction surface 140, the third refraction surface 130, the second refraction surface 120, and the first refraction surface 110. The light guide strip 100 changes The movement track of the infrared light reduces the height of the infrared light after passing through the light guide strip 100, so that the infrared lamp 600 can still receive the infrared light even when the installation position is low.

The frame 500 has a first side, a second side, a third side, and a fourth side. The first side is opposite to the second side, the third side is opposite to the fourth side, and the first side, An infrared lamp 600 and a light guide strip 100 are installed on the second side, the third side, and the fourth side.

The infrared lamp 600 on the first side corresponds to the infrared lamp 600 on the second side, and the infrared lamp 600 on the third side corresponds to the infrared lamp 600 on the fourth side. The first side corresponds to the third side. The infrared lamps 600 on the side are infrared emitting lamps, and the infrared lamps 600 on the second and fourth sides are infrared receiving lamps. The infrared light emitted by the infrared lamp 600 on the first side passes through the light guide strip 100 and is located on the front side of the glass screen 400, and then passes through the light guide strip 100 on the second side and is received by the infrared receiver lamp on the second side. The infrared light emitted by the infrared lamps 600 on the three sides passes through the light guide strip 100 and is located on the front side of the glass screen 400, and then passes through the light guide strip 100 on the fourth side and is received by the infrared receiver lamp on the fourth side.

In order to realize the fixing of the light guide strip 100 and the frame 500, a fixing groove 170 is provided on the light guide strip 100, and the frame 500 is provided with a protruding part that matches the fixing groove 170, and the light guide strip 100 passes through the fixing groove. 170 and the protruding part are fixed to the frame 500, the fixing method of the light guide strip 100 is simple, and the installation of the light guide strip 100 is convenient.

The light guide strip 100 is fixed between the frame 500 and the glass screen 400. After being fixed, the first mounting surface 150 of the light guide strip 100 is against the glass screen 400. There is no gap between the light guide strip 100 and the glass screen 400, and the display device is touched. External dust and the like will not enter the touch display device through the space between the light guide strip 100 and the glass screen 400, and will not affect the touch sensitivity of the touch display device due to the dust and the like.

The above are only specific examples of this application, and do not limit the scope of protection of this application; any replacements and improvements made on the basis of not violating the concept of this application belong to the scope of protection of this application.

Claims

The light guide strip has a first refraction surface, a second refraction surface, a third refraction surface, and a fourth refraction surface, and the second refraction surface and the third refraction surface are located on the first refraction surface and the fourth refraction surface In between, the intersection of the first refraction surface or its extension and the second refraction surface or its extension is on the first side, and the third refraction surface or its extension and the fourth refraction surface or its extension The intersection of the extension line is located on the second side, and the line connecting the midpoint of the first refraction surface and the midpoint of the fourth refraction surface is taken as the reference line, and the first side and the second side are respectively located on the reference Opposite sides of the line.
The light guide strip according to claim 1, wherein the first side is located on the back side of the reference line, and the second side is located on the front side of the reference line.
The light guide strip according to claim 1, wherein the angle formed by the intersection of the first refraction surface or its extension and the second refraction surface or its extension is α, and the third refraction surface or its extension The angle formed by the extension line and the fourth refraction surface or the extension line thereof is β, and the angle difference between the angle α and the angle β is 0 to 20 degrees.
5. The light guide strip of claim 3, wherein the angle α is equal to the angle β.
The light guide strip according to any one of claims 1 to 4, wherein the light guide strip further has a first mounting surface and a second mounting surface, and the first mounting surface and the second mounting surface are respectively located at the The two sides of the reference line.
5. The light guide strip according to claim 5, wherein the first refraction surface intersects the first mounting surface, and the included angle between the first refraction surface and the extension line of the first mounting surface is less than 90 degree.
7. The light guide strip of claim 6, wherein the angle between the first refraction surface and the extension line of the first mounting surface is 30 degrees to 60 degrees.
5. The light guide strip of claim 5, wherein the fourth refraction surface intersects the first mounting surface, and the angle between the fourth refraction surface and the first mounting surface is 70 degrees to 90 degrees degree.
5. The light guide strip of claim 5, wherein the first refraction surface, the first mounting surface, the fourth refraction surface, and the second mounting surface are sequentially connected to form a ring structure.
A touch display device, which includes a display module, a glass screen, a frame, an infrared lamp, and the light guide strip according to any one of claims 1 to 9, and the display module and the glass screen are mounted on On the frame, the display module is located on the rear side of the glass screen, the infrared lamp is fixed on the frame and located on the front side of one side of the glass screen, and the light guide strip is fixed On the frame, the light guide strip is located on the light transmission channel of the infrared lamp, and the first refraction surface is close to the infrared lamp.
The touch display device according to claim 10, wherein the light guide strip is provided with a fixing groove, the frame is provided with a protruding part, the protruding part matches the fixing groove, and the light guide The strip is fixed to the frame through the fixing groove and the protruding part.
11. The touch display device of claim 11, wherein the light guide strip abuts the glass screen.
The touch display device of claim 10, wherein the frame has at least a first side and a second side, and the first side is opposite to the second side, and the first side and the second side are opposite to each other. The second side is provided with an infrared lamp and a light guide strip, the first side corresponds to the infrared lamp of the second side, and the first side and the second side are The infrared lamp on one side is an infrared emitting lamp, and the infrared lamp on the other side is an infrared receiving lamp.