CN102902121B - Double-sided display device and backlight module - Google Patents

Abstract

A double-sided display device and a backlight module are provided, the double-sided display device comprises a first display panel, a second display panel and the backlight module arranged between the first display panel and the second display panel. The backlight module comprises a digital plate, a first light guide plate, a second light guide plate and at least one light-emitting element. The digital plate is arranged between the first light guide plate and the second light guide plate and comprises a shielding layer, a first sensing layer and a second sensing layer, wherein the first sensing layer is positioned between the shielding layer and the first light guide plate, and the second sensing layer is positioned between the shielding layer and the second light guide plate. The first light guide plate is disposed between the first display panel and the digitizer. The second light guide plate is disposed between the second display panel and the digitizer. The at least one light-emitting element is arranged beside the first light guide plate and the second light guide plate.

Description

Double-sided display device and backlight module

technical field

The invention relates to a display device and its backlight module, in particular to a double-sided display device combined with a digitizer to realize a touch function and a backlight module suitable for the double-sided display device.

Background technique

Flat panel display is the communication interface between people and information, so its development is particularly important. Among various types of flat panel displays, Liquid Crystal Display (LCD) has superior characteristics such as high space utilization efficiency, low power consumption, no radiation, and low electromagnetic interference, so LCD displays are very popular among consumers.

With the progress of display technology, the application fields of liquid crystal displays are very wide. Among them, the liquid crystal display with double-sided display function can be applied to portable consumer electronic devices, or used as a large-size liquid crystal display television for viewing by the public. Generally speaking, two liquid crystal display panels can be used to complete the manufacture of a double-sided liquid crystal display, so as to achieve the purpose of double-sided display.

On the other hand, the display device can integrate a touch panel to provide a display interface with a touch input function. However, the traditional double-sided display device does not have a design for integrating a touch panel, resulting in a relatively narrow application range. If touch panels are added on both sides of the device, the thickness and volume of the double-sided display device will be increased, which is not conducive to thinning and lightening the double-sided display device.

Contents of the invention

The technical problem to be solved by the present invention is to provide a double-sided display device and a backlight module, combined with a digital panel to simultaneously provide double-sided display and sensing functions.

In order to achieve the above object, the present invention provides a double-sided display device, which includes:

A first display panel with a first display surface;

A second display panel is arranged parallel to the first display panel, and the second display panel has a second display surface facing away from the first display panel;

A digital tablet is arranged between the first display panel and the second display panel, the digital tablet includes:

a shielding layer;

a first sensing layer located between the shielding layer and the first display panel; and

a second sensing layer located between the shielding layer and the second display panel;

A first light guide plate, arranged between the first display panel and the digital panel;

a second light guide plate disposed between the second display panel and the digital panel; and

At least one light emitting element is arranged beside the first light guide plate and the second light guide plate, and is suitable for emitting a first light into the first light guide plate and a second light into the second light guide plate.

The above-mentioned double-sided display device, which also includes:

a first reflective layer located between the first sensing layer and the first display panel; and

a second reflective layer located between the second sensing layer and the second display panel,

Wherein, the material of the first reflective layer and the second reflective layer is non-metal.

In the above double-sided display device, the shielding layer can generate a shielding signal.

In the above double-sided display device, wherein the first light guide plate and the second light guide plate correspond to the same light emitting element, so as to respectively receive the first light and the second light emitted by the same light emitting element.

The above-mentioned double-sided display device, wherein the at least one light-emitting element includes:

a first light-emitting element, arranged beside the first light guide plate, to emit the first light into the first light guide plate; and

A second light-emitting element is arranged beside the second light guide plate to emit the second light into the second light guide plate.

The above double-sided display device, wherein the first light guide plate and the second light guide plate are wedge-shaped light guide plates respectively, a first side of the first light guide plate is opposite to a second side of the second light guide plate, and The first light emitting element and the second light emitting element are respectively located beside the first side and the second side.

In order to better achieve the above object, the present invention also provides a backlight module, which includes:

A digital tablet, including:

a masking layer;

a first sensing layer located between the shielding layer and the first display panel; and

a second sensing layer located between the shielding layer and the second display panel;

A first light guide plate and a second light guide plate are respectively arranged on opposite sides of the digitizer; and

At least one light emitting element is arranged beside the first light guide plate and the second light guide plate, and is suitable for emitting a first light into the first light guide plate and a second light into the second light guide plate.

The above-mentioned backlight module further includes:

a first reflective layer located on the first sensing layer; and

a second reflective layer located on the second sensing layer,

Wherein, the material of the first reflective layer and the second reflective layer is non-metal.

In the above backlight module, the shielding layer can generate a shielding signal.

In the aforementioned backlight module, wherein the first light guide plate and the second light guide plate correspond to the same light emitting element, so as to respectively receive the first light and the second light emitted by the same light emitting element.

The above-mentioned backlight module, wherein the at least one light-emitting element includes:

a first light-emitting element, arranged beside the first light guide plate, to emit the first light into the first light guide plate; and

A second light-emitting element is arranged beside the second light guide plate to emit the second light into the second light guide plate.

In the aforementioned backlight module, wherein the first light guide plate and the second light guide plate are wedge-shaped light guide plates, a first side of the first light guide plate is opposite to a second side of the second light guide plate, and the first light guide plate A light emitting element and the second light emitting element are located beside the first side and the second side respectively.

The technical effect of the present invention is that: the combination of the digital board can simultaneously provide the functions of double-sided display and sensing.

The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments, but not as a limitation of the present invention.

Description of drawings

FIG. 1 is a double-sided display device according to an embodiment of the present invention;

Fig. 2 is the detailed structure of the digital board according to an embodiment of the present invention;

FIG. 3 is a double-sided display device according to another embodiment of the present invention;

FIG. 4 is a double-sided display device according to another embodiment of the present invention.

Among them, reference signs

100 double-sided display device

110 first display panel

112 first display surface

120 second display panel

122 second display surface

130 backlight module

132 digital tablet

134 The first light guide plate

134a Light incident surface of the first light guide plate

136 Second light guide plate

136a Light incident surface of the second light guide plate

138 light emitting elements

140 frame

150 The first optical film

160 second optical film

210 first sensing layer

220 second sensing layer

230 masking layer

240 first reflection layer

250 second reflective layer

300 double-sided display device

310 first display panel

320 second display panel

330 backlight module

332 digital tablet

334 The first light guide plate

334a Light incident surface of the first light guide plate

336 second light guide plate

336a Light incident surface of the second light guide plate

338 The first light-emitting element

339 second light-emitting element

400 double-sided display device

410 first display panel

420 second display panel

430 backlight module

432 digital tablet

434 The first light guide plate

434a Light incident surface of the first light guide plate

434b The slope of the first light guide plate

436 Second light guide plate

436a Light incident surface of the second light guide plate

436b The slope of the second light guide plate

438 The first light-emitting element

439 second light-emitting element

L1～L6: light

S1～S6: surface light source

Detailed ways

Below in conjunction with accompanying drawing, structural principle and working principle of the present invention are specifically described:

The invention provides a double-sided display device combined with a digital board to simultaneously provide double-sided display and sensing functions. By controlling the signal of the shielding layer, the user can simultaneously perform independent touch operations on opposite sides of the double-sided display device, or display the touch information input from one side of the double-sided display device on the other side. side to improve operational interaction. Since the digital panel of the present invention has two sensing layers for double-sided sensing, and shares a shielding layer, it can save costs and reduce the thickness of the double-sided display device, which is conducive to achieving thinning and smoothing of the double-sided display device. lightweight.

FIG. 1 is a double-sided display device according to an embodiment of the present invention. The double-sided display device 100 includes components such as a first display panel 110, a second display panel 120, a backlight module 130, and an outer frame 140, wherein the first display panel 110 and the second display panel 120 are arranged parallel to each other, and the first display panel 110 The second display panel 120 is, for example, a liquid crystal display panel. The backlight module 130 is disposed between the first display panel 110 and the second display panel 120 to provide display backlight for the first display panel 110 and the second display panel 120 . The outer frame 140 covers the first display panel 110, the second display panel 120 and the backlight module 130, and exposes the first display surface 112 of the first display panel 110 and the second display surface 122 of the second display panel 120, so as to provide Two-way display screen output.

The backlight module 130 includes a digital panel 132 , a first light guide plate 134 , a second light guide plate 136 and a light emitting element 138 . The first light guide plate 134 and the second light guide plate 136 of this embodiment are, for example, flat-type light guide plates, and are respectively disposed on opposite sides of the tablet 132 . The light-emitting element 138 is, for example, a light-emitting diode element, which is arranged beside the light-incident surface 134a of the first light guide plate 134 and the light-incident surface 136a of the second light guide plate 136 to emit the first light L1 and enter the first light guide plate 134. And emit the second light L2 to enter the second light guide plate 136 . The first light guide plate 134 can convert the first light L1 and output the surface light source S1 to the first display panel 110, and the second light guide plate 136 can convert the second light L2 and output the surface light source S2 to the second display panel 120, so that the first The display panel 110 and the second display panel 120 respectively display a frame.

In addition, a first optical film 150 may be disposed between the first display panel 110 and the backlight module 130 to adjust the surface light source S1 output by the backlight module 130 . A second optical film 160 may be disposed between the second display panel 120 and the backlight module 130 to adjust the surface light source S2 output by the backlight module 130 . The first optical film 150 and the second optical film 160 may be common optical films such as a diffusion film, an enhancement film, a prism film, or a combination thereof.

In this embodiment, a digital panel 132 is disposed between the first light guide plate 134 and the second light guide plate 136 to integrate the sensing function in the backlight module 130 . In other words, the double-sided display device 100 using the backlight module 130 can simultaneously provide double-sided display and sensing functions.

FIG. 2 further shows the detailed structure of the digital tablet 132 of this embodiment. The tablet 132 includes a first sensing layer 210 , a second sensing layer 220 and a shielding layer 230 therebetween. The first sensing layer 210 is located between the shielding layer 230 and the first display panel 110 to provide a sensing function on the first display surface 112 . The second sensing layer 220 is located between the shielding layer 230 and the second display panel 120 to provide a sensing function on the first display surface 112 . Here, the first sensing layer 210 and the second sensing layer 220 are, for example, sensing structures capable of realizing an electromagnetic touch function, and are used to receive signals from an electromagnetic stylus. In addition, in one embodiment, the shielding layer 230 is made of common existing materials (such as metal materials or shielding films that can prevent electromagnetic interference), so as to prevent the first sensing layer 210 from receiving signals from the stylus on the other side. . In another embodiment, the shielding layer 230 can also be controlled by a signal to enable or disable the shielding function.

For example, the user can realize different operation modes by controlling the signal of the shielding layer 230 . For example, a shielding signal can be input to the shielding layer 230 to allow different users to perform independent touch operations on the first display surface 112 and the second display surface 122 of the double-sided display device 100 at the same time. Alternatively, the shielding signal on the shielding layer 230 is removed, so that when a user performs a touch operation on the first display surface 112 of the double-sided display device 100, the second sensing layer 220 on the other side of the shielding layer 230 The user's touch information can be sensed at the same time, so as to display the touch information on the second display surface 122 for another user to watch. In this way, the interaction between the two users in operation can be realized.

In this embodiment, the first reflective layer 240 and the second reflective layer 250 may also be selected to be respectively disposed on the first sensing layer 210 and the second sensing layer 220 . In other words, the backsides of the first display panel 110 and the second display panel 120 respectively have the first reflective layer 240 and the second reflective layer 250 to integrate the function of the reflective sheet into the digital tablet 132 .

The material of the first reflective layer 240 and the second reflective layer 250 can be selected from non-metal, so as to avoid shielding or interfering with the touch information input by the user. Similarly, it is recommended to exclude the existence of other metal film layers between the first display panel 110 and the first sensing layer 210 and between the second display panel 110 and the second sensing layer 210, so as to maintain the normal operation of the digital tablet 132 operate.

FIG. 3 is a double-sided display device according to another embodiment of the present invention. Compared with the embodiment shown in FIG. 1, the double-sided display device 300 of this embodiment is similar to the aforementioned double-sided display device 100, the main difference is that the backlight module 330 of this embodiment uses two light-emitting elements to provide independent light output.

More specifically, the backlight module 330 of this embodiment includes a digital panel 332 , a first light guide plate 334 , a second light guide plate 336 , a first light emitting element 338 and a second light emitting element 339 . The tablet 332 is, for example, the structure shown in FIG. 2 . The first light guide plate 334 and the second light guide plate 336 are, for example, flat-type light guide plates, and are respectively disposed on opposite sides of the tablet 332 . The first light emitting element 338 is, for example, a light emitting diode element, and is disposed beside the light incident surface 334 a of the first light guide plate 334 for emitting the first light L3 to enter the first light guide plate 334 . The second light emitting element 339 is, for example, a light emitting diode element, and is disposed beside the light incident surface 336 a of the second light guide plate 336 for emitting the second light L4 into the second light guide plate 336 . In this embodiment, the light incident surface 334a of the first light guide plate 334 is adjacent to the light incident surface 336a of the second light guide plate 336, that is, the first light emitting element 338 and the second light emitting element 339 are located between the first light guide plate 334 and the light incident surface 336a. the same side of the second light guide plate 336 . However, in another embodiment, the first light emitting element 338 and the second light emitting element 339 may also be selected to be placed on opposite sides of the first light guide plate 334 and the second light guide plate 336 . The first light guide plate 334 can convert the first light L3 and output the surface light source S3 to the first display panel 310, and the second light guide plate 336 can convert the second light L4 and output the surface light source S4 to the second display panel 320, so that the first The display panel 310 and the second display panel 320 respectively display a frame.

Since this embodiment uses independent first light-emitting elements 338 and second light-emitting elements 339, the backlight sources of the first display panel 310 and the second display panel 320 can be independently designed as required, such as providing different color temperatures or different intensities. The backlight is connected to the first display panel 310 and the second display panel 320 .

FIG. 4 is a double-sided display device according to another embodiment of the present invention. Compared with the embodiment shown in FIG. 3, the double-sided display device 400 of this embodiment is similar to the aforementioned double-sided display device 300, the main difference is that this embodiment uses a wedge-type (wedge-type) light guide plate and accordingly the light-emitting elements The position has been adjusted.

More specifically, the backlight module 430 of this embodiment includes a digital panel 432 , a first light guide plate 434 , a second light guide plate 436 , a first light emitting element 438 and a second light emitting element 439 . The tablet 432 is, for example, the structure shown in FIG. 2 . The first light guide plate 434 and the second light guide plate 436 are wedge-shaped light guide plates respectively disposed on opposite sides of the tablet 432 , and the slope 434b of the first light guide plate 434 faces the slope 436b of the second light guide plate 436 . The first light emitting element 438 is, for example, a light emitting diode element, and is disposed beside the light incident surface 434 a of the first light guide plate 434 for emitting the first light L5 into the first light guide plate 434 . The second light emitting element 439 is, for example, a light emitting diode element, and is disposed beside the light incident surface 436 a of the second light guide plate 436 for emitting the second light L6 into the second light guide plate 436 . The first light guide plate 434 can convert the first light L5 and output the surface light source S5 to the first display panel 410, and the second light guide plate 436 can convert the second light L6 and output the surface light source S6 to the second display panel 420, so that the first The display panel 410 and the second display panel 420 respectively display a frame. This embodiment also has the advantage of independently designing the backlight sources of the first display panel 410 and the second display panel 420 according to requirements.

Certainly, the present invention also can have other multiple embodiments, without departing from the spirit and essence of the present invention, those skilled in the art can make various corresponding changes and deformations according to the present invention, but these corresponding Changes and deformations should belong to the scope of protection of the appended claims of the present invention.

Claims (12)

1. A double-sided display device, characterized in that, comprising: A first display panel with a first display surface; A second display panel is arranged parallel to the first display panel, and the second display panel has a second display surface facing away from the first display panel; A digital tablet is arranged between the first display panel and the second display panel, the digital tablet includes: a masking layer; a first sensing layer located between the shielding layer and the first display panel; and a second sensing layer located between the shielding layer and the second display panel; A first light guide plate, arranged between the first display panel and the digital panel; a second light guide plate disposed between the second display panel and the digital panel; and At least one light emitting element is arranged beside the first light guide plate and the second light guide plate, and is suitable for emitting a first light into the first light guide plate and a second light into the second light guide plate. 2. The double-sided display device according to claim 1, further comprising: a first reflective layer located between the first sensing layer and the first display panel; and a second reflective layer located between the second sensing layer and the second display panel, Wherein, the material of the first reflective layer and the second reflective layer is non-metal. 3. The double-sided display device as claimed in claim 1, wherein the shielding layer can generate a shielding signal. 4. The double-sided display device according to claim 1, wherein the first light guide plate and the second light guide plate correspond to the same light-emitting element, so as to respectively receive the first light and the second light emitted by the same light-emitting element. Two rays. 5. The double-sided display device according to claim 1, wherein the at least one light emitting element comprises: a first light-emitting element, arranged beside the first light guide plate, to emit the first light into the first light guide plate; and A second light-emitting element is arranged beside the second light guide plate to emit the second light into the second light guide plate. 6. The double-sided display device according to claim 5, wherein the first light guide plate and the second light guide plate are wedge-shaped light guide plates respectively, and a first side surface of the first light guide plate and the second light guide plate A second side of the light plate is opposite, and the first light-emitting element and the second light-emitting element are respectively located beside the first side and the second side. 7. A backlight module, characterized in that, comprising: A digital tablet, including: a masking layer; a first sensing layer located between the shielding layer and a first display panel; and a second sensing layer located between the shielding layer and a second display panel; A first light guide plate and a second light guide plate are respectively arranged on opposite sides of the digitizer; and At least one light emitting element is arranged beside the first light guide plate and the second light guide plate, and is suitable for emitting a first light into the first light guide plate and a second light into the second light guide plate. 8. The backlight module according to claim 7, further comprising: a first reflective layer located on the first sensing layer; and a second reflective layer located on the second sensing layer, Wherein, the material of the first reflective layer and the second reflective layer is non-metal. 9. The backlight module as claimed in claim 7, wherein the shielding layer can generate a shielding signal. 10. The backlight module according to claim 7, wherein the first light guide plate and the second light guide plate correspond to the same light emitting element, so as to respectively receive the first light and the second light emitted by the same light emitting element . 11. The backlight module according to claim 7, wherein the at least one light emitting element comprises: a first light-emitting element, arranged beside the first light guide plate, to emit the first light into the first light guide plate; and A second light-emitting element is arranged beside the second light guide plate to emit the second light into the second light guide plate. 12. The backlight module according to claim 11, wherein the first light guide plate and the second light guide plate are wedge-shaped light guide plates respectively, a first side of the first light guide plate and a side of the second light guide plate A second side is opposite, and the first light-emitting element and the second light-emitting element are respectively located beside the first side and the second side.