TWI884783B - Electromagnetic touch light-emitting panel - Google Patents

Abstract

An electromagnetic touch light-emitting panel includes an electromagnetic induction panel and a light-emitting panel. The electromagnetic induction panel is configured to emit electromagnetic fields. The light-emitting panel is disposed on a side of the electromagnetic induction panel. The light-emitting panel includes a substrate, a circuit pattern layer and a plurality of light-emitting elements. The circuit pattern layer is disposed on the substrate. The light-emitting elements, corresponding to the circuit pattern layer, is disposed on a side of the substrate opposite to the electromagnetic induction plate. The circuit pattern layer has a plurality of slits to allow the electromagnetic fields to penetrate the light-emitting panel.

Description

Electromagnetic touch luminous panel

The present invention relates to a touch light-emitting panel, and in particular to an electromagnetic touch light-emitting panel.

With the development of displays and smart products, touch displays have become a standard feature of smart products. According to the working principle, touch technology can be divided into resistive, capacitive, optical, acoustic or electromagnetic induction. Among them, electromagnetic induction touch technology can best achieve a true pen touch, so high-end drawing systems usually use electromagnetic induction touch.

In order to improve the image quality of the display, the display's light-emitting panel is preferably a direct-type light-emitting panel. However, the current direct-type light-emitting panel will shield the electromagnetic field generated by the electromagnetic plate, thereby seriously interfering with the operation of the stylus.

The present invention provides an electromagnetic touch luminous panel, which can provide direct luminous and reduce the problem of electromagnetic field shielding generated by the electromagnetic plate.

An embodiment of the present invention provides an electromagnetic touch luminous panel, which includes an electromagnetic induction board and a luminous board. The electromagnetic induction board is used to emit an electromagnetic field. The luminous board is arranged on one side of the electromagnetic induction board. The luminous board includes a substrate, a circuit pattern layer and a plurality of luminous elements. The circuit pattern layer is arranged on the substrate. The luminous elements are arranged on a side of the substrate opposite to the electromagnetic induction board corresponding to the circuit pattern layer. The circuit pattern layer has a plurality of slits so that the electromagnetic field can penetrate the luminous board.

Based on the above, in an electromagnetic touch luminous panel of an embodiment of the present invention, the electromagnetic touch luminous panel includes an electromagnetic induction board and a luminous board, and the circuit pattern layer of the luminous board has a plurality of slits, so that the electromagnetic field emitted by the electromagnetic induction board can penetrate the luminous board. Therefore, the electromagnetic touch luminous panel can provide direct lighting and reduce the problem of shielding of the electromagnetic field generated by its electromagnetic induction board.

FIG. 1 is a schematic cross-sectional view of an electromagnetic touch luminous panel according to an embodiment of the present invention. FIG. 2 is a schematic top view of an electromagnetic touch luminous panel according to an embodiment of the present invention. Referring to FIG. 1 and FIG. 2, an embodiment of the present invention provides an electromagnetic touch luminous panel 10, which includes an electromagnetic induction plate 100 and a luminous plate 200. The electromagnetic induction plate 100 is used to emit an electromagnetic field EM. The luminous plate 200 is disposed on one side of the electromagnetic induction plate 100. The luminous plate 200 includes a substrate 210, a circuit pattern layer 220, and a plurality of luminous elements 230. The circuit pattern layer 220 is disposed on (the surface of) the substrate 210. The light emitting element 230 corresponds to the circuit pattern layer 220 and is disposed on a side of the substrate 210 opposite to the electromagnetic induction board 100. The circuit pattern layer 220 has a plurality of slits O so that the electromagnetic field EM can penetrate the light emitting board 200.

Specifically, in this example, the substrate 210 may be a FR4 (frame retardant 4, glass epoxy or glass fiber) substrate or a glass substrate, but the present invention is not limited thereto. The material of the circuit pattern layer 220 may be copper, aluminum foil or other metal materials. In addition, the light-emitting element 230 may be a light-emitting diode (LED), a sub-millimeter light-emitting diode (Mini LED) or a micro light-emitting diode (Micro LED), but the present invention is not limited thereto.

In this embodiment, the width of the slit O is preferably greater than or equal to 0.1 mm.

In this embodiment, the circuit pattern layer 220 includes an upper circuit layer 222 and a ground layer 224. The upper circuit layer 222 is disposed on the side of the substrate 210 opposite to the electromagnetic induction board 100. The light emitting element 230 is disposed on the upper circuit layer 222, and the upper circuit layer 222 is disposed between the light emitting element 230 and the substrate 210. The ground layer 224 is disposed on the side of the substrate 210 facing the electromagnetic induction board 100 opposite to the upper circuit layer 222.

In this embodiment, the range of the orthographic projection of the upper circuit layer 222 toward the ground layer 224 overlaps with the range of the ground layer 224 .

In this embodiment, the upper circuit layer 222 includes a plurality of upper conductors 2220. These upper conductors 2220 are arranged in parallel or cross-arranged with each other. The ground layer 224 includes a plurality of ground conductors 2240. These ground conductors 2240 are arranged in parallel or cross-arranged with each other. Among them, the width W1 of the ground conductor 2240 is greater than the width W2 of the upper conductor 2220, or the range of the orthographic projection of the upper conductor 2220 toward the ground conductor 2240 overlaps with the range of the ground conductor 2240.

In this embodiment, the width W1 of the ground wire 2240 is less than or equal to 30 mm.

In one embodiment, the current directions A1 and A2 of any two adjacent and parallel upper conductors 2220 are opposite and the distance D between them is less than or equal to 1 mm. In other words, when the distance D between two adjacent and parallel upper conductors 2220 is small enough and the current directions A1 and A2 are opposite, the induced magnetic field generated by the current passing through an upper conductor 2220 and the induced magnetic field generated by the adjacent upper conductor 2220 can cancel each other out, thereby reducing the problem of the induced magnetic field generated by the upper conductor 2220 interfering with the electromagnetic field EM generated by the electromagnetic induction board 100.

In this embodiment, the current applied to the upper wire 2220 is less than 30 mA, and the frequency of the pulse-width modulation (PWM) signal applied to the upper wire 2220 is greater than or equal to 400 kHz. In other words, when the current applied to the upper wire 2220 is less than 30 mA, a higher frequency pulse-width modulation signal can be obtained, thereby reducing visual discomfort when viewing the electromagnetic touch luminous panel 10.

In this embodiment, the light-emitting board 200 further includes a plurality of microcontrollers 250. The microcontrollers 250 are disposed on the circuit pattern layer 220 and are respectively adjacent to the light-emitting elements 230 to control the brightness of the light-emitting elements 230.

In this embodiment, the electromagnetic touch luminous panel 10 further includes at least one flexible flat cable (FFC) 300. The flexible flat cable 300 is electrically connected to the circuit pattern layer 220 and is disposed at the edge of the substrate 210. In other words, the flexible flat cable 300 that is prone to interfere with the electromagnetic field EM is disposed at the edge of the substrate 210, so that the electromagnetic touch luminous panel 10 can provide a better electromagnetic induction effect.

In this embodiment, the electromagnetic touch luminous panel 10 further includes at least one controller 400 . The controller 400 is electrically connected to the flexible flat cable 300 to control the brightness of the luminous element 230 .

In the present embodiment, the microcontroller 250 or the controller 500 includes, for example, a microcontroller unit (MCU), a central processing unit (CPU), a microprocessor, a digital signal processor (DSP), a programmable controller, a programmable logic device (PLD), or other similar devices or a combination of these devices, and the present invention is not limited thereto. In addition, in one embodiment, each function of the microcontroller 250 or the controller 500 can be implemented as a plurality of program codes. These program codes are stored in a memory, and the microcontroller 250 or the controller 500 executes these program codes. Alternatively, in one embodiment, each function of the microcontroller 250 or the controller 500 can be implemented as one or more circuits. The present invention does not limit the implementation of the functions of the microcontroller 250 or the controller 500 by software or hardware.

In addition, in other embodiments, the electromagnetic touch luminous panel 10 may be provided with only the microcontroller 250 or only the controller 500, and the microcontroller 250 or the controller 500 is used to control the luminous element 230 to emit light.

In this embodiment, the light-emitting board further includes a protective layer 260 . The protective layer 260 is, for example, a conformal coating. The protective layer 260 is disposed on the substrate 210 or the circuit pattern layer 220 .

Based on the above, in one embodiment of the present invention, the electromagnetic touch luminous panel 10 includes an electromagnetic induction board 100 and a luminous board 200. The luminous board 200 includes a substrate 210, a circuit pattern layer 220, and a plurality of luminous elements 230. The circuit pattern layer 220 is disposed on the substrate 210, and the luminous elements 230 are disposed on a side of the substrate 210 relative to the electromagnetic induction board 100 corresponding to the circuit pattern layer 220. The circuit pattern layer 220 has a plurality of slits O, so that the electromagnetic field EM emitted by the electromagnetic induction board 100 can penetrate the luminous board 200. Therefore, the electromagnetic touch luminous panel 10 can provide direct luminescence and reduce the problem of shielding of the electromagnetic field EM generated by the electromagnetic induction board 100.

FIG3 is a schematic diagram of an electromagnetic touch luminous panel according to another embodiment of the present invention. Referring to FIG3 , the electromagnetic touch luminous panel 10′ is similar to the electromagnetic touch luminous panel 10 of FIG2 , and the main difference is that in this embodiment, the circuit pattern layer 220′ and the luminous element 230 are composed of a plurality of luminous light strips 203′. These luminous light strips 203′ are arranged parallel to each other on the substrate 210. That is, the upper circuit layer and the ground layer in the circuit pattern layer 220′ are both arranged on the same side of the substrate 210.

In summary, in one embodiment of the present invention, the electromagnetic touch luminous panel includes an electromagnetic induction board and a luminous board, and the luminous board includes a substrate, a circuit pattern layer, and a plurality of luminous elements. The circuit pattern layer has a plurality of slits, so that the electromagnetic field emitted by the electromagnetic induction board can penetrate the luminous board. Therefore, the electromagnetic touch luminous panel can provide direct luminescence and reduce the problem of shielding of the electromagnetic field generated by the electromagnetic induction board.

10, 10': electromagnetic touch light panel 100: electromagnetic induction board 200: light board 203': light strip 210: substrate 220, 220': circuit pattern layer 222: upper circuit layer 224: ground layer 230: light element 400: controller 260: protective layer 2220: upper conductor 2240: ground conductor A1, A2: current direction D: distance EM: electromagnetic field O: slit W, W1, W2: width

FIG. 1 is a schematic cross-sectional view of an electromagnetic touch luminescent panel according to an embodiment of the present invention. FIG. 2 is a schematic top view of an electromagnetic touch luminescent panel according to an embodiment of the present invention. FIG. 3 is a schematic view of an electromagnetic touch luminescent panel according to another embodiment of the present invention.

10: Electromagnetic touch luminous panel

100: Electromagnetic induction board

200: Luminous board

210:Substrate

220: Circuit pattern layer

222: Go to line layer

224: Ground layer

260: Protective layer

2220: Upper conductor

2240: Grounding wire

A1, A2: Current direction

D: distance

EM:Electromagnetic field

O: Open seam

W, W1, W2: Width

Claims (14)

An electromagnetic touch luminous panel comprises: an electromagnetic induction plate for emitting an electromagnetic field; and a luminous plate disposed on one side of the electromagnetic induction plate, comprising: a substrate; a circuit pattern layer disposed on the substrate; and a plurality of luminous elements disposed on one side of the substrate opposite to the electromagnetic induction plate corresponding to the circuit pattern layer, wherein the circuit pattern layer has a plurality of slits so that the electromagnetic field can penetrate the luminous plate. The electromagnetic touch luminous panel as described in claim 1, wherein the material of the circuit pattern layer is copper or aluminum foil. An electromagnetic touch luminous panel as described in claim 1, wherein the width of the slits is greater than or equal to 0.1 mm. The electromagnetic touch luminous panel as described in claim 1, wherein the circuit pattern layer includes: an upper circuit layer, arranged on the side of the substrate opposite to the electromagnetic induction board, wherein the light-emitting elements are arranged on the upper circuit layer; and a ground layer, arranged on the side of the substrate facing the electromagnetic induction board relative to the upper circuit layer. An electromagnetic touch luminous panel as described in claim 4, wherein the range of the orthographic projection of the upper circuit layer toward the ground layer overlaps with the range of the ground layer. The electromagnetic touch light-emitting panel as described in claim 4, wherein the upper circuit layer includes a plurality of upper conductors, which are arranged in parallel or cross-arranged with each other, wherein the grounding layer includes a plurality of grounding conductors, which are arranged in parallel or cross-arranged with each other, wherein the width of the grounding conductors is greater than the width of the upper conductors. An electromagnetic touch lighting panel as described in claim 6, wherein the width of the grounding wires is less than or equal to 30 mm. An electromagnetic touch luminous panel as described in claim 6, wherein the current directions of any two adjacent and parallel upper conductive lines are opposite and the distance between them is less than or equal to 1 mm. An electromagnetic touch light-emitting panel as described in claim 6, wherein the current of the upper conductors is less than 30 mA, and the frequency of the pulse width modulation signal is greater than or equal to 400 kHz. The electromagnetic touch luminous panel as described in claim 1, wherein the luminous panel further comprises: A plurality of microcontrollers, disposed on the circuit pattern layer and respectively adjacent to the luminous elements, to control the brightness of the luminous elements. An electromagnetic touch luminous panel as described in claim 1, wherein the substrate is a FR4 substrate or a glass substrate. The electromagnetic touch luminous panel as described in claim 1 further includes: At least one flexible flat cable electrically connected to the circuit pattern layer and disposed at the edge of the substrate. The electromagnetic touch luminous panel as described in claim 12 further includes: At least one controller electrically connected to the at least one flexible flat cable for controlling the brightness of the luminous elements. The electromagnetic touch light-emitting panel as described in claim 1, wherein the circuit pattern layer and the light-emitting elements are composed of a plurality of light-emitting strips, and the light-emitting strips are arranged parallel to each other on the substrate.

Images