Direct-type backlight module and touch display device using the direct-type backlight module

Abstract

The present disclosure relates to the field of touch technology, and provides a backlight module and a touch display device using the backlight module. The backlight module includes: a substrate, a plurality of driving electrode lines, a plurality of receiving electrode lines, and a plurality of light sources. The driving electrode lines are arranged on the substrate. The receiving electrode lines are arranged on the substrate, wherein the receiving electrode lines and the driving electrode lines define a plurality of light source areas on the substrate. The light sources are arranged in the light source areas, wherein at least one of the light sources is arranged in each light source area. The touch display device includes: a backlight module and a display panel. The backlight module is used to provide backlight light. The display panel is arranged on the backlight module to display an image using the backlight light provided by the backlight module. By integrating the receiving electrode lines and the driving electrode lines into the backlight module, the overall thickness and volume of the touch display device can be reduced.

Description

Technical Field

[0001] The present disclosure relates to the field of touch control technology, and more particularly to a direct-type backlight module integrated with a touch control function and a touch control display device using the direct-type backlight module. Background Art

[0002] Touch display devices are widely used in various electronic devices, such as smart phones, tablet computers, cameras, e-book readers and other electronic products. The existing touch display device includes a backlight module, a display panel, a capacitive touch sensor panel and an electromagnetic touch sensor panel, wherein the capacitive touch sensor panel includes a capacitive touch sensor module and a capacitive touch sensor circuit to sense the touch of the user's finger, and the electromagnetic touch sensor panel includes an electromagnetic touch sensor module and an electromagnetic touch sensor circuit to sense the touch of the electromagnetic stylus. However, the capacitive touch sensor panel and the electromagnetic touch sensor panel are stacked on the display panel, which greatly increases the thickness of the touch display device, and the operations of the capacitive touch sensor panel and the electromagnetic touch sensor panel will also interfere with each other. Therefore, the industry is in urgent need of proposing a new touch display device to overcome the problems of increased thickness and easy interference in existing touch display devices. Summary of the invention

[0003] In order to solve the above technical problems, the present disclosure aims to provide a backlight module which integrates capacitive touch sensing function and electromagnetic touch sensing function and performs capacitive touch sensing and electromagnetic touch sensing in a time-sharing manner to avoid mutual interference between capacitive touch sensing and electromagnetic touch sensing.

[0004] Another object of the present disclosure is to provide a touch display device, which uses the above-mentioned backlight module to integrate capacitive touch sensing function and electromagnetic touch sensing function, and performs capacitive touch sensing and electromagnetic sensing in a time-sharing manner to avoid mutual interference between capacitive touch sensing and electromagnetic touch sensing, and reduce the thickness of the touch display device.

[0005] The technical solution adopted in this disclosure is:

[0006] A backlight module comprises: a substrate, a plurality of driving electrode lines, a plurality of receiving electrode lines, and a plurality of light sources. The driving electrode lines are arranged on the substrate. The receiving electrode lines are arranged on the substrate, wherein the receiving electrode lines and the driving electrode lines define a plurality of light source areas on the substrate. The light sources are arranged in the light source areas, wherein at least one of the light sources is arranged in each light source area.

[0007] In some embodiments, the light source is a light emitting diode.

[0008] In some embodiments, the backlight module further includes: a switch module, a capacitive touch sensing module, and an electromagnetic touch sensing module. The switch module is electrically connected to the receiving electrode line and the driving electrode line. The capacitive touch sensing module is electrically connected to the switch module. The electromagnetic touch sensing module is electrically connected to the switch module. The switch module is used to electrically connect the capacitive touch sensing module to the receiving electrode line and the driving electrode line in a first touch sensing period, and to electrically connect the electromagnetic touch sensing module to the receiving electrode line and the sensing line in a second touch sensing period. The capacitive touch sensing module is used to perform touch sensing using the receiving electrode line and the driving electrode line in the first touch sensing period. The electromagnetic touch sensing module is used to perform touch sensing using the receiving electrode line and the driving electrode line in the second touch sensing period.

[0009] In some embodiments, the substrate is a printed circuit board.

[0010] In some embodiments, the receiving electrode lines and the driving electrode lines are copper wires.

[0011] A touch display device comprises: a backlight module and a display panel. The backlight module is used to provide backlight. The display panel is arranged on the backlight module to display an image using the backlight provided by the backlight module. The backlight module comprises: a substrate, a plurality of driving electrode lines, a plurality of receiving electrode lines, and a plurality of light sources. The driving electrode lines are arranged on the substrate. The receiving electrode lines are arranged on the substrate, wherein the receiving electrode lines and the driving electrode lines define a plurality of light source areas on the substrate.

[0012] In some embodiments, the light source is a light emitting diode.

[0013] In some embodiments, the backlight module further includes: a switch module, a capacitive touch sensing module, and an electromagnetic touch sensing module. The switch module is electrically connected to the receiving electrode line and the driving electrode line. The capacitive touch sensing module is electrically connected to the switch module. The electromagnetic touch sensing module is electrically connected to the switch module. The switch module is used to electrically connect the capacitive touch sensing module to the receiving electrode line and the driving electrode line in a first touch sensing period, and to electrically connect the electromagnetic touch sensing module to the receiving electrode line and the sensing line in a second touch sensing period. The capacitive touch sensing module is used to perform touch sensing using the receiving electrode line and the driving electrode line in the first touch sensing period. The electromagnetic touch sensing module is used to perform touch sensing using the receiving electrode line and the driving electrode line in the second touch sensing period.

[0014] In some embodiments, the substrate is a printed circuit board.

[0015] In some embodiments, the receiving electrode lines and the driving electrode lines are copper wires.

[0016] The present invention sets receiving electrode lines and driving electrode lines on a printed circuit board of a backlight module, and integrates a capacitive touch sensing module and an electromagnetic touch sensing module in the backlight module to perform capacitive touch sensing and electromagnetic touch sensing in a time-sharing manner. This can avoid mutual interference between capacitive touch sensing and electromagnetic touch sensing, and reduce the thickness of the touch display device. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to make the above features and advantages of the present disclosure more obvious and easy to understand, the following embodiments are specifically cited and described in detail with the attached drawings. From the following detailed description made in conjunction with the attached drawings, the aspects of the present disclosure can be better understood. It should be noted that according to standard practices in the industry, the features are not drawn to scale. In fact, in order to make the discussion clearer, the size of each feature can be increased or decreased arbitrarily.

[0018] Figure 1 is a schematic structural diagram of a touch display device according to an embodiment of the present disclosure;

[0019] Figure 2 is a functional block diagram of a backlight module according to an embodiment of the present disclosure;

[0020] Figure 3 is a partial structural schematic diagram of a light source substrate according to an embodiment of the present disclosure;

[0021] Figure 4 is a partial structural schematic diagram of a light source substrate according to an embodiment of the present disclosure;

[0022] Figure 5 is a timing diagram of the electromagnetic touch sensing function and the capacitive touch sensing function according to an embodiment of the present disclosure;

[0023] Figure 6 is a structural schematic diagram of a switch module according to an embodiment of the present disclosure.

[0024] Explanation of symbols

[0025] 100: Touch display device

[0026] 110: Backlight module

[0027] 120: Display panel

[0028] 112:Light source substrate

[0029] 112a: driving electrode line

[0030] 112b: receiving electrode line

[0031] 112c: Light source

[0032] 112P: Projection

[0033] 114: Switch module

[0034] 114a: First multitasking device

[0035] 114b: Second multiplexer

[0036] 114c: Third multitasker

[0037] 114d: The fourth multitasker

[0038] 116: Capacitive touch sensing module

[0039] 118: Electromagnetic touch sensing module

[0040] P11: Input pin

[0041] P12: Output pin

[0042] P21: Input pin

[0043] P22: Output pin

[0044] P31: Input pin

[0045] P32: Output pin

[0046] P41: Input pin

[0047] P42: Output pin

[0048] SA: Light source area

[0049] SC: Control signal

[0050] T1: First touch sensing period

[0051] T2: Second touch sensing period DETAILED DESCRIPTION

[0052] In order to make the purpose, technical solutions and advantages of the present disclosure more clear, the present disclosure is further described in detail below in conjunction with the accompanying drawings, implementation methods, and examples. It should be understood that the specific implementation methods and examples described herein are only used to explain the present disclosure and are not used to limit the scope of the claims.

[0053] Please refer to Figure 1 , Figure 11 is a schematic diagram of the structure of a touch display device 100 according to an embodiment of the present disclosure. The touch display device 100 includes a backlight module 110 and a display panel 120. The backlight module 110 is used to provide backlight required by the display panel 120, and the display panel 120 is disposed on the backlight module 110 to display an image using the backlight provided by the backlight module 110. In this embodiment, the backlight module 110 is a direct-type backlight module, and the display panel 120 is a liquid crystal display panel.

[0054] Please refer to Figure 2 and Figure 3 , Figure 2 is a functional block diagram of the backlight module 110 according to an embodiment of the present disclosure, Figure 3 1 is a partial structural schematic diagram of a light source substrate 112 according to an embodiment of the present disclosure. The backlight module 110 includes a light source substrate 112, a switch module 114, a capacitive touch sensing module 116 and an electromagnetic touch sensing module 118. The light source substrate 112 includes a substrate (not shown), a driving electrode line 112a, a receiving electrode line 112b and a light source 112c. The substrate may be a printed circuit board, such as a copper foil substrate. The driving electrode line 112a, the receiving electrode line 112b and the light source 112c are arranged on the substrate, wherein the driving electrode line 112a and the receiving electrode line 112b are arranged in the gap between the light sources 112c. It can also be understood that the light source 112c is arranged in the light source area SA defined by the driving electrode line 112a and the receiving electrode line 112b. In the present embodiment, the driving electrode line 112a and the receiving electrode line 112b are arranged on the same surface of the substrate, and cross each other perpendicularly to define the light source area SA. At the intersection of the driving electrode line 112a and the receiving electrode line 112b, the driving electrode line 112a can pass under the receiving electrode line 112b using a via, or the receiving electrode line 112b can pass under the driving electrode line 112a using a via. In another embodiment of the present disclosure, the driving electrode line 112a and the receiving electrode line 112b can be arranged on different surfaces of the substrate. For example, the driving electrode line 112a and the light source 112c are arranged on the front side of the substrate, while the receiving electrode line 112b is arranged on the back side of the substrate. The projection 112P of the receiving electrode line 112b on the front side of the substrate can define a light source area SA with the driving electrode line 112a, such as Figure 4 In another embodiment of the present disclosure, the substrate may be a multi-layer circuit board, and the driving electrode lines 112a and / or the receiving electrode lines 112b may be disposed in an inner layer of the substrate.

[0055] In this embodiment, the light source 112c is a light emitting diode, and the driving electrode line 112a and the receiving electrode line 112b are copper wires. For example, the driving electrode line 112a and the receiving electrode line 112b can be formed using the copper layer of the substrate. Since the driving electrode line 112a and the receiving electrode line 112b are copper wires, the driving electrode line 112a and the receiving electrode line 112b have a lower resistance value than conventional driving electrode lines and receiving electrode lines made of indium tin oxide (ITO).

[0056] Please go back Figure 2 The backlight module 110 of this embodiment not only has a light source 112c to provide the backlight required by the display panel 120, but also integrates a capacitive touch sensing module 116 and an electromagnetic touch sensing module 118 to provide capacitive touch sensing functions and electromagnetic touch sensing functions. Specifically, the capacitive touch sensing module 116 and the electromagnetic touch sensing module 118 are electrically connected to the driving electrode lines 112a and the receiving electrode lines 112b of the light source substrate 112 through the switch module 114, so as to utilize the driving electrode lines 112a and the receiving electrode lines 112b to perform the capacitive touch sensing function and the electromagnetic touch sensing function, wherein the switch module 114 is used to switch the capacitive touch sensing module 116 and the electromagnetic touch sensing module 118, so as to connect one of them to the driving electrode lines 112a and the receiving electrode lines 112b.

[0057] For example, the switch module 114 can electrically connect the capacitive touch sensing module 116 to the driving electrode line 112a and the receiving electrode line 112b in the first touch sensing period to perform the capacitive touch sensing function to sense the user's finger touch. In addition, the switch module 114 can electrically connect the electromagnetic touch sensing module 118 to the driving electrode line 112a and the receiving electrode line 112b in the second touch sensing period to perform the electromagnetic touch sensing function to sense the touch of the electromagnetic stylus. In this embodiment, Figure 5 As shown, the first touch sensing period T1 and the second touch sensing period T2 are staggered with each other, so as to avoid mutual interference between the capacitive touch sensing function and the electromagnetic touch sensing function.

[0058] Please refer to Figure 6 , Figure 61 is a schematic diagram of the structure of the switch module 114 according to an embodiment of the present disclosure. The switch module 114 includes a first multiplexer 114a, a second multiplexer 114b, a third multiplexer 114c and a fourth multiplexer 114d. The first multiplexer 114a, the second multiplexer 114b, the third multiplexer 114c and the fourth multiplexer 114d are used to switch the capacitive touch sensing module 116 and the electromagnetic touch sensing module 118 according to the external input mode control signal SC to connect one of them to the driving electrode line 112a and the receiving electrode line 112b. For example, when the control signal SC is at a high level, the first multiplexer 114a, the second multiplexer 114b, the third multiplexer 114c and the fourth multiplexer 114d electrically connect the capacitive touch sensing module 116 to the driving electrode line 112a and the receiving electrode line 112b to perform the capacitive touch sensing function. For another example, when the control signal SC is at a low level, the first multiplexer 114a, the second multiplexer 114b, the third multiplexer 114c and the fourth multiplexer 114d electrically connect the electromagnetic touch sensing module 118 to the driving electrode lines 112a and the receiving electrode lines 112b to perform the electromagnetic touch sensing function.

[0059] First, consider the first multiplexer 114a and the second multiplexer 114b. The first multiplexer 114a has a plurality of input pins P11 and a plurality of output pins P12. The input pins P11 are electrically connected to the capacitive touch sensing module 116 and the electromagnetic touch sensing module 118, respectively, and the output pins P12 are electrically connected to the receiving electrode line 112b. The second multiplexer 114b has a plurality of input pins P21 and at least one output pin P22. The input pins P21 are electrically connected to the receiving electrode line 112b, and the output pins P22 are electrically grounded.

[0060] When the control signal SC is at a high level, the first multiplexer 114a connects the input pin P11 connected to the capacitive touch sensing module 116 to the output pin P12, so that the first multiplexer 114a can electrically connect the capacitive touch sensing module 116 to the receiving electrode line 112b. At the same time, the second multiplexer 114b floats the input pin P21, so that the receiving electrode line 112b can be used as a receiving electrode (RX) for capacitive touch sensing.

[0061] When the control signal SC is at a low level, the first multiplexer 114a connects the input pin P11 connected to the electromagnetic touch sensing module 118 with the output pin P12, so that the first multiplexer 114a can electrically connect the electromagnetic touch sensing module 118 to the receiving electrode line 112b. At the same time, the second multiplexer 114b connects the input pin P21 with the output pin P22, so that the receiving electrode line 112b can be used as an antenna for electromagnetic induction.

[0062] Next, consider the third multiplexer 114c and the fourth multiplexer 114d. The fourth multiplexer 114d has a plurality of input pins P41 and a plurality of output pins P42. The input pins P41 are electrically connected to the capacitive touch sensing module 116 and the electromagnetic touch sensing module 118, respectively, and the output pins P42 are electrically connected to the driving electrode line 112a. The third multiplexer 114c has a plurality of input pins P31 and at least one output pin P32. The input pins P31 are electrically connected to the driving electrode line 112a, and the output pins P32 are electrically grounded.

[0063] When the control signal SC is at a high level, the fourth multiplexer 114d connects the input pin P41 connected to the capacitive touch sensing module 116 to the output pin P42, so that the first multiplexer 114a can electrically connect the capacitive touch sensing module 116 to the driving electrode line 112a, and the third multiplexer 114c floats the input pin P31, so that the driving electrode line 112a can be used as a driving electrode (TX) for capacitive touch sensing.

[0064] When the control signal SC is at a low level, the fourth multiplexer 114d connects the input pin P41 connected to the electromagnetic touch sensing module 118 with the output pin P42, so that the fourth multiplexer 114d can electrically connect the electromagnetic touch sensing module 118 to the driving electrode line 112a. At the same time, the third multiplexer 114c connects the input pin P31 with the output pin P32, so that the driving electrode line 112a can serve as an antenna for electromagnetic induction.

[0065] It can be seen from the above description that when the control signal SC is at a high level, the first multiplexer 114a, the second multiplexer 114b, the third multiplexer 114c and the fourth multiplexer 114d electrically connect the capacitive touch sensing module 116 to one end of the driving electrode line 112a and the receiving electrode line 112b, and float the other ends of the driving electrode line 112a and the receiving electrode line 112b. In this way, the capacitive touch sensing module 116 can use the driving electrode line 112a and the receiving electrode line 112b as the driving electrode and the receiving electrode to perform capacitive touch sensing. Furthermore, when the control signal SC is at a low level, the first multiplexer 114a, the second multiplexer 114b, the third multiplexer 114c and the fourth multiplexer 114d electrically connect the electromagnetic touch sensing module 118 to one end of the driving electrode line 112a and the receiving electrode line 112b, and ground the other ends of the driving electrode line 112a and the receiving electrode line 112b, so that the electromagnetic touch sensing module 118 can use the driving electrode line 112a and the receiving electrode line 112b as antennas to perform electromagnetic touch sensing. By controlling the level of the control signal SC, capacitive touch sensing and electromagnetic touch sensing can be switched.

[0066] In addition, considering the problem of antenna impedance matching, when performing electromagnetic touch sensing, multiple (for example, three) driving electrode lines 112 a / receiving electrode lines 112 b may be regarded as one signal channel to overcome the problem of antenna impedance matching.

[0067] In summary, the implementation methods of the present disclosure reduce the overall thickness of the touch display device by integrating the driving electrode lines and the receiving electrode lines into the backlight module. Secondly, the production of the driving electrode lines and the receiving electrode lines can be integrated into the process of the printed circuit board, so that the driving electrode lines and the receiving electrode lines can be formed of metal materials (for example, copper), thereby greatly reducing the impedance of the driving electrode lines and the receiving electrode lines and the manufacturing time and manufacturing cost of the touch display device. Furthermore, the switch module 114 switches the electromagnetic touch sensing module 118 and the capacitive touch sensing module 116 to perform capacitive touch sensing and electromagnetic touch sensing in a time-sharing manner, so that the capacitive touch sensing and the electromagnetic touch sensing can be prevented from interfering with each other.

[0068] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A direct-type backlight module, It is characterized in that Include: a substrate, wherein the substrate is a printed circuit board; A plurality of driving electrode lines are arranged on the printed circuit board, wherein the plurality of driving electrode lines are copper wires; A plurality of receiving electrode lines are arranged on the printed circuit board, wherein the receiving electrode lines and the driving electrode lines define a plurality of light source areas on the substrate, and the plurality of receiving electrode lines are copper wires, so that the driving electrode lines and the receiving electrode lines are integrated into the printed circuit board; A plurality of light sources are disposed in the light source regions, wherein at least one of the light sources is disposed in each of the light source regions; and a switch module, electrically connected to the receiving electrode line and the driving electrode line, and configured to switch between a first state and a second state; in: The driving electrode lines and the receiving electrode lines are arranged on the same surface of the substrate, and the driving electrode lines and the receiving electrode lines have an intersection, the driving electrode lines pass under the receiving electrode lines at the intersection using a conducting hole, or the receiving electrode lines pass under the driving electrode lines at the intersection using a conducting hole; The switch module comprises: a first multiplexer having a first input pin group, a second input pin group and an output pin group, wherein the first input pin group of the first multiplexer is coupled to a capacitive touch sensing module, the second input pin group of the first multiplexer is coupled to an electromagnetic touch sensing module, and the output pin group of the first multiplexer is coupled to a plurality of first endpoints of the plurality of receiving electrode lines; a second multiplexer having a first input pin group and an output pin, wherein the first input pin group of the second multiplexer is coupled to a plurality of second endpoints of the plurality of receiving electrode lines, and the output pin of the second multiplexer is electrically grounded; When the switch module is in the first state, the plurality of second endpoints of the plurality of receiving electrode lines are in a floating state; When the switch module is in the second state, the second endpoints of the receiving electrode lines are electrically grounded.

2. The direct-type backlight module according to claim 1, It is characterized in that The light source is a light emitting diode.

3. The direct-lit backlight module according to claim 1, It is characterized in that The switch module further comprises: a third multiplexer having a first input pin group, a second input pin group and an output pin group, wherein the first input pin group of the third multiplexer is coupled to the capacitive touch sensing module, the second input pin group of the third multiplexer is coupled to the electromagnetic touch sensing module, and the output pin group of the third multiplexer is coupled to a plurality of second endpoints of the plurality of driving electrode lines; and A fourth multiplexer has a first input pin group and an output pin. The first input pin group of the fourth multiplexer is coupled to the first endpoints of the plurality of driving electrode lines, and the output pin of the fourth multiplexer is electrically grounded.

4. A touch display device, It is characterized in that Include: A direct-type backlight module is used to provide backlight, wherein the direct-type backlight module comprises: a substrate, wherein the substrate is a printed circuit board; A plurality of driving electrode lines are arranged on the printed circuit board, wherein the plurality of driving electrode lines are copper wires; A plurality of receiving electrode lines are arranged on the printed circuit board, wherein the receiving electrode lines and the driving electrode lines define a plurality of light source areas on the substrate, and the plurality of receiving electrode lines are copper wires, so that the driving electrode lines and the receiving electrode lines are integrated into the printed circuit board; and A plurality of light sources are disposed in the light source regions, wherein at least one of the light sources is disposed in each of the light source regions; and a switch module, electrically connected to the receiving electrode line and the driving electrode line, and configured to switch between a first state and a second state; a display panel disposed on the direct-type backlight module to display images using the backlight provided by the direct-type backlight module; in: The driving electrode lines and the receiving electrode lines are arranged on the same surface of the substrate, and the driving electrode lines and the receiving electrode lines have an intersection, the driving electrode lines pass under the receiving electrode lines at the intersection using a conducting hole, or the receiving electrode lines pass under the driving electrode lines at the intersection using a conducting hole; The switch module comprises: a first multiplexer having a first input pin group, a second input pin group and an output pin group, wherein the first input pin group of the first multiplexer is coupled to a capacitive touch sensing module, the second input pin group of the first multiplexer is coupled to an electromagnetic touch sensing module, and the output pin group of the first multiplexer is coupled to a plurality of first endpoints of the plurality of receiving electrode lines; a second multiplexer having a first input pin group and an output pin, wherein the first input pin group of the second multiplexer is coupled to a plurality of second endpoints of the plurality of receiving electrode lines, and the output pin of the second multiplexer is electrically grounded; When the switch module is in the first state, the plurality of second endpoints of the plurality of receiving electrode lines are in a floating state; When the switch module is in the second state, the second endpoints of the receiving electrode lines are electrically grounded.

5. The touch display device according to claim 4, It is characterized in that The light source is a light emitting diode.

6. The touch display device according to claim 4, It is characterized in that The switch module further comprises: a third multiplexer having a first input pin group, a second input pin group and an output pin group, wherein the first input pin group of the third multiplexer is coupled to the capacitive touch sensing module, the second input pin group of the third multiplexer is coupled to the electromagnetic touch sensing module, and the output pin group of the third multiplexer is coupled to a plurality of second endpoints of the plurality of driving electrode lines; and A fourth multiplexer has a first input pin group and an output pin. The first input pin group of the fourth multiplexer is coupled to the first endpoints of the plurality of driving electrode lines, and the output pin of the fourth multiplexer is electrically grounded.

Images