CN215642646U

CN215642646U - Virtual key illumination module and touch display device

Info

Publication number: CN215642646U
Application number: CN202121278387.9U
Authority: CN
Inventors: 谌微
Original assignee: Nanchang Qinsheng Electronic Technology Co ltd
Current assignee: Nanchang Qinsheng Electronic Technology Co ltd
Priority date: 2021-06-08
Filing date: 2021-06-08
Publication date: 2022-01-25
Anticipated expiration: 2031-06-08

Abstract

The utility model provides a virtual key illumination module and a touch display device. The utility model provides a virtual key illumination module which is used for providing illumination for a plurality of virtual keys arranged on a touch panel at intervals and comprises a light-emitting component, a light guide film and at least one light shielding film; the at least one light shielding film comprises a bottom light shielding film, and the light guide film and the bottom light shielding film are sequentially arranged on the back of the touch panel; the light emitting component is arranged on the outer side of at least one end of the light guide film, the light emitting direction of the light emitting component faces the light guide film, and light rays emitted by the light emitting component are incident into the light guide film from the side of the light guide film. The virtual key illumination module provided by the utility model has good light-emitting uniformity, improves the light leakage phenomenon and improves the product quality.

Description

Virtual key illumination module and touch display device

Technical Field

The utility model relates to the technical field of backlight illumination, in particular to a virtual key illumination module and a touch display device.

Background

With the progress of science and technology, more and more display devices are mounted on a touch panel in the market. The touch panel is also called a touch screen or a touch screen, and can receive input signals such as a contact, and when a virtual key on the screen is touched, the on-screen tactile feedback system can drive various connecting devices according to a pre-programmed program, so that the touch panel can be used for replacing a mechanical button panel.

In the existing touch panel device with virtual keys, the lighting function of the virtual keys is usually added to adapt to the use scene in the dark environment. In a conventional virtual key illumination design, a top light-emitting LED is arranged below each key, the LED is fixed on a Printed Circuit Board (PCB) through a bonding pad, and the on and off of each LED is controlled by using the Circuit design of the PCB, so that the light-emitting effect of the virtual key is achieved.

However, in the prior art, the light emission of the whole virtual key is not uniform, and the light leakage phenomenon exists.

SUMMERY OF THE UTILITY MODEL

In order to solve at least one problem mentioned in the background art, the utility model provides a virtual key illumination module and a touch display device.

In order to achieve the above purpose, the utility model provides the following technical scheme:

in one aspect, the utility model provides a virtual key illumination module for providing illumination to a plurality of virtual keys arranged on a touch panel at intervals, comprising a light emitting component, a light guide film and at least one light shielding film; the at least one light shielding film comprises a bottom light shielding film, and the light guide film and the bottom light shielding film are sequentially arranged on the back of the touch panel; the light emitting component is arranged on the outer side of at least one end of the light guide film, and light rays emitted by the light emitting component are incident into the light guide film from the side of the light guide film.

Optionally, the at least one light shielding film further includes a surface light shielding film, and the surface light shielding film is located between the touch panel and the light guiding film; the surface shading film is provided with a plurality of light holes at intervals, and the light holes correspond to the virtual keys one to one.

As mentioned above, optionally, the edge of the bottom light shielding film and the edge of the surface light shielding film both extend out of the light guiding film, and the edge of the bottom light shielding film and the edge of the surface light shielding film are attached to each other.

As mentioned above, optionally, the bottom light shielding film and the surface light shielding film both include a substrate, a surface of the substrate facing the light guiding film is a light reflecting surface, and a surface of the substrate facing away from the light guiding film is a light absorbing surface.

Optionally, the light emitting assembly includes a flexible circuit board and at least one light emitting diode disposed on the flexible circuit board, and a light emitting surface of the light emitting diode faces the light guiding film.

In the virtual key illumination module as described above, optionally, a plurality of light emitting diodes are disposed on the flexible circuit board at intervals, and each light emitting diode is located on the same straight line as a corresponding column of virtual keys in the virtual keys arranged in an array.

As described above, optionally, the surface of the flexible circuit board facing the light guide film has a reflective layer.

Optionally, a portion of the flexible circuit board is embedded between the light guide film and the bottom light shielding film, and the light emitting diode is tightly attached to the light guide film.

As mentioned above, optionally, the surface of the flexible circuit board facing the light guide film is covered with an adhesive layer, and the flexible circuit board and the light guide film are connected by the adhesive layer.

In another aspect, the present invention provides a touch display device, including a touch panel and the virtual key illumination module as described above; the virtual key lighting module is arranged on the back of the touch panel, a plurality of virtual keys are arranged on the touch panel at intervals, and the virtual key lighting module is used for providing lighting for the virtual keys.

The virtual key illumination module is used for providing illumination for a plurality of virtual keys arranged on a touch panel at intervals, a light guide film is arranged on the back surface of the touch panel, a light emitting component is arranged on the outer side of at least one of the top end and the bottom end of the light guide film, the light emitting component is a lateral light emitting component, light emitted by the light emitting component faces the lateral side of the light guide film and is incident into the light guide film from the lateral side of the light guide film, and the light is uniformly irradiated to all parts of the touch panel through the light guide film; therefore, on one hand, the LEDs do not need to be arranged below each virtual key correspondingly, so that the cost and the overall power consumption can be reduced, and on the other hand, the uniformity of the light emission of the virtual keys is improved; and, through set up the end photomask behind the leaded light membrane, the light that the end photomask can shelter from and absorb to follow the leaded light membrane and jet out behind one's back weakens the light leak phenomenon of module, promotes the product quality.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention. For a person skilled in the art, without inventive effort, further figures can be obtained from these figures.

Fig. 1 is a schematic structural diagram of a touch panel with virtual keys;

FIG. 2 is a schematic diagram illustrating a prior art LED for the virtual key shown in FIG. 1;

FIG. 3 is a cross-sectional view of a prior art virtual key illumination module;

fig. 4 is an assembly structure diagram of a virtual key illumination module according to an embodiment of the present invention;

fig. 5 is an assembly structure diagram of a surface light shielding film and a touch panel according to a first embodiment of the present invention;

fig. 6 is an assembly structure diagram of the surface light shielding film, the light guiding film, the light emitting assembly and the bottom light shielding film according to the first embodiment of the present invention;

FIG. 7 is a partial cross-sectional view of FIG. 6;

fig. 8 is a schematic structural diagram of a light emitting device according to an embodiment of the present invention;

fig. 9 is a cross-sectional view illustrating an assembly of a light emitting device and a light guiding film according to an embodiment of the present invention.

Description of reference numerals:

100-a touch panel; 110-virtual keys; 120-a light-shielding layer;

1-an LED; 2-PCB; 3-shading sleeve;

200-virtual key lighting module;

210-a light emitting component; 220-a light directing film; 230-bottom light shielding film; 240-face shading film;

211-FPC; 212-LED; 241-light holes;

2111-a light-reflecting layer; 2112-glue line.

Detailed Description

Fig. 1 is a schematic structural diagram of a touch panel with virtual keys; FIG. 2 is a schematic diagram illustrating a prior art LED for the virtual key shown in FIG. 1; fig. 3 is a cross-sectional view of a prior art virtual key illumination module.

As shown in fig. 1, taking the touch panel 100 as an example in which a plurality of number virtual keys 110 and control virtual keys 110 are arranged at intervals, in conjunction with fig. 2, in the prior art, LEDs 1 are correspondingly arranged on the back surface of each virtual key 110 to provide illumination for each virtual key 110. As shown in fig. 3, the LEDs 1 are disposed on a Printed Circuit Board (PCB) at intervals, the PCB2 is located on the back of the touch panel 100, the LEDs 1 are fixed on the surface of the PCB2 facing the touch panel 100, and the LEDs 1 are top-emitting LEDs 1, that is, the light-emitting surface of the LED1 faces the corresponding virtual key 110; the outer sleeve of each LED1 is equipped with shading cover 3 to prevent light leakage between adjacent LEDs 1.

The LEDs 1 are arranged in one-to-one correspondence with the virtual keys 110, so that the number of the LEDs 1 is large, the cost of the product is increased, and the power consumption is high; moreover, the light emitting effect of the virtual key 110 is not uniform, and especially for the virtual key 110 with a large coverage area, for example, for controlling the virtual key 110, the light emitting uniformity of the virtual key 110 is poor.

In addition, a gap should be formed between the top-emitting LED1 located behind the virtual key 110 and the touch panel 100 to avoid affecting the light-emitting effect of the virtual key 110, so that, as shown in fig. 3, the overall thickness of the virtual key illumination module is: the thickness of the PCB2, the thickness of the LED1, and the width of the gap between the LED1 and the touch panel 100 are, for example, 0.4mm for the thickness of the PCB2, 0.3mm for the thickness of the LED1, and 0.5 for the width of the gap between the LED1 and the touch panel 100, and the entire thickness of the virtual key illumination module is 1.2mm, which is relatively large.

In order to solve the above technical problems, the present invention provides a virtual key illumination module and a touch display device, where the virtual key illumination module includes a light guide film, a light emitting component is disposed at a side of the light guide film, and a bottom light shielding film is disposed on a back surface of the light guide film, so as to improve light emitting uniformity of a virtual key, reduce light leakage of the illumination module, and reduce cost and power consumption of the illumination module.

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example one

Fig. 4 is an assembly structure diagram of a virtual key illumination module according to an embodiment of the present invention; fig. 5 is an assembly structure diagram of a surface light shielding film and a touch panel according to a first embodiment of the present invention; fig. 6 is an assembly structure diagram of the surface light shielding film, the light guiding film, the light emitting assembly and the bottom light shielding film according to the first embodiment of the present invention; FIG. 7 is a partial cross-sectional view of FIG. 6; fig. 8 is a schematic structural diagram of a light emitting device according to an embodiment of the present invention; fig. 9 is a cross-sectional view illustrating an assembly of a light emitting device and a light guiding film according to an embodiment of the present invention.

As shown in fig. 4, the present embodiment provides a virtual key illumination module 200 (hereinafter referred to as an illumination module 200), in which the virtual key illumination module 200 includes a light emitting element 210, a light guiding film 220 and at least one light shielding film. The illumination module 200 is used for illuminating a plurality of virtual keys 110 arranged on the touch panel 100 at intervals, the light emitting element 210 is used for illuminating the virtual keys 110, the light guide film 220 is used for improving the light emitting uniformity of the virtual keys 110, and the light shielding film is used for reducing the light leakage phenomenon of the illumination module 200.

Specifically, the light guide film 220 is disposed on the back surface of the touch panel 100, as shown in fig. 4, for example, the length of the light guide film 220 is smaller than that of the touch panel 100, an accommodating space is disposed outside at least one of two ends of the light guide film 220 in the length direction, and the light emitting element 210 is disposed in the accommodating space.

For example, in the direction shown in fig. 4, the outer side of the bottom end of the light guiding film 220 has an accommodating space, and the light emitting assembly 210 is located at the bottom end of the light guiding film 220; or, the outer side of the top end of the light guiding film 220 has an accommodating space, and the light emitting assembly 210 is located at the top end of the light guiding film 220; or, the bottom end and the top end of the light guide film 220 are both provided with an accommodating space, and the bottom end and the top end of the light guide film 220 are both provided with the light emitting assembly 210.

The light emitting assembly 210 is a side-in light emitting assembly 210, light emitted by the light emitting assembly 210 irradiates the side wall of the light guiding film 220, and the light is incident into the light guiding film 220 from the side of the light guiding film 220, and through the light-homogenizing effect of the light guiding film 220, the light emitted by the light emitting assembly 210 uniformly irradiates the touch panel 100, so that the light emitting uniformity of each virtual key 110 can be improved, and particularly, the light emitting uniformity of the virtual key 110 is good for the virtual key 110 with a large coverage area.

As shown in fig. 4, in the present embodiment, the light shielding film includes a bottom light shielding film 230 disposed on the back of the light guiding film 220, that is, the light guiding film 220 and the bottom light shielding film 230 are sequentially disposed on the back of the touch panel 100. Because the light guide film 220 has high transparency, after the light emitted from the light emitting assembly 210 enters the light guide film 220, part of the light is emitted from the back of the light guide film 220, so that the light leakage of the lighting module 200 is caused, and the light emitting utilization rate of the lighting module 200 is reduced.

By disposing the bottom light shielding film 230 on the back of the light guiding film 220, the light emitted from the back of the light guiding film 220 is irradiated to the bottom light shielding film 230, and the light is prevented from passing through the bottom light shielding film 230 to be emitted outward by the light shielding and light absorption of the bottom light shielding film 230, so as to reduce the light leakage phenomenon of the lighting module 200.

Specifically, the bottom light shielding film 230 includes a substrate, illustratively, Polyethylene terephthalate (PET), and the surface of the substrate is treated to shield and absorb light. Taking the substrate of the bottom light shielding film 230 as a PET substrate as an example, the surface of the substrate is subjected to silk-screen printing to form a light absorbing surface on the surface of the substrate away from the light guiding film 220, the light absorbing surface is, for example, a black surface, and the phenomenon of light leakage from the back surface of the light guiding film 220 to the outside is reduced by light shielding and light absorption of the light absorbing surface.

In addition, in order to enhance the light emitting effect of the illumination module 200, a reflective surface may be formed on the surface of the base surface of the bottom light shielding film 230 facing the light guiding film 220, for example, a reflective surface is formed by performing a silk-screen printing process on the surface of the PET base surface facing the light guiding film 220, and the reflective surface may be a white surface taking the light emitted by the light emitting element 210 as white light as an example. The light emitted from the back of the light guiding film 220 irradiates the reflective surface of the bottom light shielding film 230, and the reflective surface can reflect the light to the light guiding film 220, so that the light emitted by the light emitting element 210 is concentrated to irradiate the virtual key 110, thereby improving the light utilization rate of the illumination module 200.

It can be understood that the virtual key 110 on the touch panel 100 is transparent, so that the light emitted from the light emitting element 210 illuminates the virtual key 110. By disposing the bottom light shielding film 230 on the back of the light guiding film 220 with high transparency, the bottom light shielding film 230 can shield the structure on the back of the light guiding film 220, so as to prevent the light-permeable virtual key 110 from exposing the structure behind the lighting module 200.

As shown in fig. 4, in practical applications, the back surface of the touch panel 100 is usually coated with a light shielding layer 120 on the periphery of each virtual key 110, the light shielding layer 120 bypasses the position of each virtual key 110, and the light shielding layer 120 can shield and absorb light irradiated to the periphery of the virtual key 110, so that the light emitting area on the touch panel 100 is concentrated on the position of each virtual key 110, thereby achieving the light emitting effect of the virtual key 110.

However, the light shielding layer 120 coated on the back surface of the touch panel 100 cannot completely shield the light irradiated outside the virtual key 110 area, so that there may be a light leakage phenomenon at the edge of the touch panel 100, and the light utilization rate of the virtual key 110 is affected, which affects the light emitting effect of the virtual key 110.

In contrast, as shown in fig. 4, in the present embodiment, the light shielding film may further include a surface light shielding film 240 disposed between the touch panel 100 and the light guiding film 220, a plurality of light holes 241 are disposed at intervals on the surface light shielding film 240, and the light holes 241 correspond to the virtual keys 110 one-to-one.

By arranging the surface light shielding film 240 on the light emitting side of the light guiding film 220 (i.e., the light incident side of the touch panel 100), the light transmitting holes 241 on the surface light shielding film 240 expose the positions of the virtual keys 110, and by the light shielding and light absorbing effects of the surface light shielding film 240, light is prevented from being irradiated to other areas of the touch panel 100 except the positions of the virtual keys 110, so that the light emitting effect of the virtual keys 110 is enhanced, and light leakage of the touch panel 100 is prevented.

Similarly to the bottom light-shielding film 230, the surface light-shielding film 240 may include a substrate, for example, the substrate of the surface light-shielding film 240 is a PET substrate, and both side surfaces of the surface light-shielding film 240 are processed, for example, screen-printed, so that both side surfaces of the surface light-shielding film 240 form a light-absorbing surface and a light-reflecting surface, respectively. Illustratively, the light absorbing surface of the surface light-shielding film 240 is a black surface, and the light reflecting surface of the surface light-shielding film 240 is a white surface.

The light-reflecting surface of the surface light-shielding film 240 faces the light-guiding film 220, so that light rays emitted from the light-guiding film 220 to the surface light-shielding film 240 are reflected into the light-guiding film 220, and the light rays emitted from the light-guiding film 220 pass through the light-transmitting holes 241 of the surface light-shielding film 240 and are intensively irradiated to the positions of the virtual keys 110, thereby improving the light-emitting effect of the virtual keys 110; the light absorbing surface of the surface light shielding film 240 faces the touch panel 100, and the light of the other regions outside the virtual keys 110 on the touch panel 100 is shielded and absorbed by the light absorbing surface of the surface light shielding film 240, so that light leakage of the touch panel 100 is prevented.

The cross-sectional area of the light hole 241 on the surface light shielding film 240 is larger than the coverage area of the corresponding virtual key 110, and taking the light hole 241 as a circular light hole 241 as an example, the edge of the light hole 241 is expanded outward by 0.3-0.5mm according to the boundary profile of the virtual key 110, so as to prevent the edge of the virtual key 110 from being blocked and displaying badly due to the attachment deviation of the surface light shielding film 240.

As shown in fig. 5, for the number virtual key 110, the edge of the light-transmitting hole 241 is, illustratively, enlarged outward by a dimension a of 0.5 mm; for the control virtual key 110, the edge of the light transmission hole 241 is expanded outward by a size b of 0.3 mm.

To avoid light leakage from the edge of the illumination module 200, as shown in fig. 6 and 7, the outer edge of the bottom light shielding film 230 and the outer edge of the surface light shielding film 240 may both extend out of the light guiding film 220, and the edge of the bottom light shielding film 230 and the edge of the surface light shielding film 240 are attached. Thus, after the bottom light shielding film 230 and the surface light shielding film 240 are attached to each other, the light guiding film 220 can be completely wrapped by the bottom light shielding film 230 and the surface light shielding film 240, and the light guiding film 220 can be shielded from light leakage at the edge by the bottom light shielding film 230 and the surface light shielding film 240, so that light leakage at the edge of the light guiding film 220 can be avoided.

As shown in fig. 6, in practical applications, the single side size of the bottom light shielding film 230 and the surface light shielding film 240 may be about 0.5mm larger than the single side size of the light guiding film 220, so as to ensure that the bottom light shielding film 230 and the surface light shielding film 240 can be bonded together, and the light guiding film 220 can be completely wrapped by the bonded two. For example, as shown in fig. 6, in the length direction, the dimension c of the edge of the bottom light shielding film 230 and the edge of the surface light shielding film 240 beyond the edge of the light guiding film 220 is 0.5 mm; the dimension d in the width direction where the edge of the bottom light shielding film 230 and the edge of the surface light shielding film 240 exceed the edge of the light guiding film 220 is 0.5 mm.

As shown in fig. 8, the Light Emitting assembly 210 may include a Flexible Printed Circuit (FPC) 211 and at least one Light-Emitting Diode (LED 212), and the LED212 is disposed on the Flexible Circuit. For example, a copper foil circuit is arranged on the flexible circuit board, and the LED212 is carried by the copper foil circuit, so that the LED212 circuit is conducted.

In this embodiment, the LEDs 212 are located at the side of the light guiding film 220, the LEDs 212 are side-in LEDs 212, the light emitting surface of the LEDs 212 faces the light guiding film 220, and the light emitted by the LEDs 212 enters the light guiding film 220 from the side of the light guiding film 220.

By arranging the light emitting assembly 210 at the side of the light guide film 220, the light emitting assembly 210 does not occupy the thickness space of the illumination module 200, and because the LED212 is a side-in LED212, the light emitted by the LED212 irradiates the touch panel 100 through the light guide film 220, and no gap is reserved between the light guide film 220 and the touch panel 100, thereby reducing the thickness of the illumination module 200.

In addition, by arranging the FPC211, the LED212 is arranged on the FPC211, the arrangement of the FPC211 is more flexible, the occupied space is smaller, the LED212 is conveniently arranged on the side of the light guide film 220, and the light emitting assembly 210 is easily fixed.

In practical applications, as shown in fig. 5, a plurality of virtual keys 110 on the touch panel 100 are arranged in an array, for example, a plurality of numeric virtual keys 110 are arranged in an array. For the light emitting device 210 at one end of the light guiding film 220, for example, the light emitting device 210 at the bottom end of the light guiding film 220, taking the FPC211 with 1 LED212 as an example, the LED212 may correspond to the middle row of the virtual key 110 array; taking the example of disposing more than 2 LEDs 212 on the FPC211, a plurality of LEDs 212 may be disposed at regular intervals to ensure that the LEDs 212 have a uniform light emitting effect.

For example, for the virtual keys 110 arranged in an array, a plurality of LEDs 212 arranged at intervals on the FPC211 may correspond to the virtual keys 110, and each LED212 is located on the same straight line with each column of the virtual keys 110. Thus, the uniformity of the light emitted from the LEDs 212 can be improved, and the luminance of the virtual keys 110 in each column can be improved. Taking the example that the number virtual key 110 has 3 rows, 3 LEDs 212 may be disposed on the FPC211 at intervals, and each LED212 and each row of the number virtual key 110 are located on the same straight line.

As shown in fig. 8, a reflective layer 2111 may be disposed on a surface of the FPC211 facing the light guiding film 220, and the reflective layer 2111 may reflect light emitted from the LED212 onto the surface of the FPC211 toward the light guiding film 220, so that the light emitted from the LED212 is incident into the light guiding film 220 in a concentrated manner, thereby reducing or avoiding light source loss. For example, in the case where the LED212 emits white light, light incident on the surface of the FPC211 may be reflected by printing a white coating on the surface of the FPC211 as the light reflecting layer 2111.

In practical applications, the light reflecting layer 2111 may be disposed on the surface of the FPC211, for example, a white coating is printed on the surface of the FPC211, the white coating bypasses the pads of the LEDs 212 during printing, and then the LEDs 212 are soldered on the pads.

In addition, in order to improve the light extraction efficiency of the illumination module 200, in one possible embodiment, a portion of the FPC211 may be embedded between the light guide film 220 and the bottom light shielding film 230, and the LED212 is tightly attached to the light guide film 220. As shown in fig. 9, by embedding a portion of the FPC211 between the light guide film 220 and the bottom light shielding film 230, that is, by locating the edge of the FPC211 on the back of the light guide film 220, the interval between the LED212 and the side of the light guide film 220 can be shortened.

Specifically, the portion of the FPC211 exposed on the LED212 is located on the back of the light guiding film 220, so that the light emitting surface of the LED212 is tightly attached to the light guiding film 220, and thus, light emitted by the LED212 is totally incident into the light guiding film 220, so that light emitted by the LED212 is prevented from irradiating the light guiding film 220, light source loss is avoided, the light emitting efficiency of the LED212 is improved, and the light emitting effect of the virtual key 110 is improved.

In addition, by locating the portion of the FPC211 exposed above the LED212 on the back of the light guiding film 220, it is convenient to fix the FPC 211. For example, as shown in fig. 9, by covering an adhesive layer 2112 on a surface of the FPC211 facing the light guide film 220, the adhesive layer 2112 being, for example, a double-sided adhesive, one side surface of the adhesive layer 2112 is adhered to the FPC211, and the other side surface of the adhesive layer 2112 is adhered to the back surface of the light guide film 220, the FPC211 is fixed to the back surface of the light guide film 220 through the adhesive layer 2112.

Moreover, since the FPC211 is interposed between the light guide film 220 and the bottom light shielding film 230, the bottom light shielding film 230 is in close contact with the light guide film 220, and the fixation of the FPC211 is reinforced by the interaction between the light guide film 220 and the bottom light shielding film 230.

As shown in fig. 9, the surface of the FPC211 exposed outside the LED212 may be covered with an adhesive layer 2112, and not only the portion of the FPC211 connected to the light guide film 220 has the adhesive layer 2112, but also the portion of the surface of the FPC211 facing away from the light guide film 220 has the adhesive layer 2112. Thus, taking the light emitting element 210 at the bottom of the light guiding film 220 as an example, the portion of the surface light shielding film 240 near the bottom edge can be adhered to the adhesive layer 2112 on the surface of the FPC211, which is helpful for fixing the surface light shielding film 240 and can make the FPC211 more secure.

As shown in fig. 9, taking the height of the LED212 and the thickness of the light guiding film 220 as an example, the thickness of the lighting module 200 of the present embodiment is: the thickness of the surface light shielding film 240, the height of the LEDs 212, the thickness of the FPC211 and the thickness of the bottom light shielding film 230 are 0.05mm, the height of the LEDs 212 is 0.3mm, the thickness of the FPC211 is 0.12mm, the thickness of the bottom light shielding film 230 is 0.05mm, for example, the overall thickness of the illumination module 200 is 0.52mm, which is much smaller than the thickness of the illumination module in the prior art, so that the illumination module 200 is thinner and thinner.

The virtual key illumination module 200 provided in this embodiment is configured to provide illumination for a plurality of virtual keys 110 disposed at intervals on the touch panel 100, a light guide film 220 is disposed on the back of the touch panel 100, a light emitting element 210 is disposed outside at least one of the top end and the bottom end of the light guide film 220, the light emitting element 210 is a lateral light emitting element 210, light emitted by the light emitting element 210 faces the lateral side of the light guide film 220 and is incident into the light guide film 220 from the lateral side of the light guide film 220, and the light is uniformly irradiated to each part of the touch panel 100 through the light guide film 220; therefore, on one hand, the LEDs 212 do not need to be arranged below each virtual key 110 correspondingly, so that the cost and the overall power consumption can be reduced, and on the other hand, the uniformity of the light emission of the virtual keys 110 is improved; moreover, the bottom light shielding film 230 is arranged behind the light guide film 220, so that the bottom light shielding film 230 can shield and absorb light emitted from the back of the light guide film 220, the light leakage phenomenon of the module is weakened, and the product quality is improved.

Example two

The present embodiment provides a touch display device, which includes a touch panel 100 and a virtual key illumination module 200 according to the first embodiment. Exemplarily, the touch display device may be an electronic device such as a mobile phone, a tablet computer, a notebook computer, an intelligent wearable device, or a combination lock.

Specifically, the virtual key illumination module 200 is located on the back surface of the touch panel 100, a plurality of virtual keys 110 are disposed on the touch panel 100 at intervals, and the virtual key illumination module 200 is used for providing illumination for the plurality of virtual keys 110.

The specific structure, function and principle of the virtual key illumination module 200 are described in detail in the first embodiment, and are not described herein again.

It is to be understood that the terms upper, lower, top, bottom, top end, bottom end, top end surface, bottom end surface, and the like referring to the present embodiment indicate the orientation based on the positional relationship of the installation and use state of the apparatus or equipment.

The embodiments or implementation modes in the present specification are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments may be referred to each other.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the utility model has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A virtual key lighting module is used for providing lighting for a plurality of virtual keys arranged on a touch panel at intervals and is characterized by comprising a light-emitting component, a light guide film and at least one light shielding film; the at least one light shielding film comprises a bottom light shielding film, and the light guide film and the bottom light shielding film are sequentially arranged on the back surface of the touch panel; the light emitting assembly is arranged on the outer side of at least one end of the light guide film, the light emitting direction of the light emitting assembly faces the light guide film, and light rays emitted by the light emitting assembly are incident into the light guide film from the side of the light guide film.

2. The virtual key illumination module according to claim 1, wherein the at least one light shielding film further comprises a surface light shielding film, the surface light shielding film being located between the touch panel and the light guide film; the surface shading film is provided with a plurality of light holes at intervals, and the light holes correspond to the virtual keys one to one.

3. The virtual key illumination module according to claim 2, wherein the edge of the bottom light shielding film and the edge of the surface light shielding film both extend out of the light guide film, and the edge of the bottom light shielding film and the edge of the surface light shielding film are attached to each other.

4. The virtual key illumination module as claimed in claim 2, wherein the bottom light shielding film and the surface light shielding film each comprise a substrate, a surface of the substrate facing the light guide film is a light reflecting surface, and a surface of the substrate facing away from the light guide film is a light absorbing surface.

5. The virtual key illumination module according to any one of claims 1 to 4, wherein the light emitting assembly comprises a flexible circuit board and at least one light emitting diode disposed on the flexible circuit board, and a light emitting surface of the light emitting diode faces the light guiding film.

6. The virtual key illumination module according to claim 5, wherein a plurality of light emitting diodes are disposed on the flexible circuit board at intervals, and each light emitting diode is aligned with the corresponding row of the virtual keys arranged in the array.

7. The virtual key illumination module of claim 5, wherein the surface of the flexible circuit board facing the light guide film has a light reflecting layer.

8. The virtual key illumination module as claimed in claim 5, wherein a portion of the flexible circuit board is embedded between the light guide film and the bottom light shielding film, and the light emitting diode is tightly attached to the light guide film.

9. The virtual key illumination module according to claim 8, wherein a surface of the flexible circuit board facing the light guide film is covered with a glue layer, and the flexible circuit board and the light guide film are connected by the glue layer.

10. A touch display device, comprising a touch panel and the virtual key illumination module of any one of claims 1 to 9; the virtual key lighting module is arranged on the back face of the touch panel, a plurality of virtual keys are arranged on the touch panel at intervals, and the virtual key lighting module is used for providing lighting for the virtual keys.