CN116893749A - electronic device - Google Patents

Abstract

An electronic device includes a touch sensing unit and a light source. The light source and the touch sensing unit are arranged adjacent to each other. The driving signal of the light source has a voltage change period. The touch sensing unit performs sensing during the sensing period. The voltage change period at least partially overlaps with the sensing period.

Description

electronic device

Technical field

Embodiments of the present disclosure relate to an electronic device, and in particular, to an electronic device that can reduce coupling interference energy.

Background technique

Known electronic devices may include a touch sensor and a light source, and the touch sensor is disposed adjacent to the light source. However, the pulse of the driving signal used to drive the light source will generate instantaneous coupling energy. This instantaneous coupling energy will interfere with the operation of the touch sensor, causing the sensing performance of the touch sensor to be affected. Therefore, a new circuit structure design is needed, which can improve the aforementioned problems.

Contents of the invention

An embodiment of the present disclosure provides an electronic device including a touch sensing unit and a light source. The light source and the touch sensing unit are arranged adjacent to each other. The driving signal of the light source has a voltage change period. The touch sensing unit performs sensing during the sensing period. The voltage change period at least partially overlaps with the sensing period.

Description of the drawings

FIG. 1 is a schematic diagram of an electronic device according to an embodiment of the present disclosure.

FIG. 2 is a waveform diagram of a driving signal according to an embodiment of the present disclosure.

FIG. 3 is a waveform diagram of a driving signal according to another embodiment of the present disclosure.

FIG. 4 is a waveform diagram of a driving signal according to another embodiment of the present disclosure.

FIG. 5 is a waveform diagram of a driving signal according to another embodiment of the present disclosure.

【Symbol Description】

100: Electronic devices

110:Touch sensing unit

120:Light source

121:Light emitting diode

130: First substrate

131: First side

132: Second side

140:Display unit

150:Second substrate

160: First drive device

170: Second drive device

S1: drive signal

TP: During voltage change

TS: sensing period

TS2: Another sensing period

TV: During light source switching

H: maximum voltage value

L: minimum voltage value

θ1, θ2: included angle

D1: Voltage change amount

Detailed ways

In order to make the purpose, features and advantages of the present disclosure more obvious and understandable, embodiments are given below and described in detail together with the accompanying drawings. For the sake of ease of understanding for readers and simplicity of the drawings, many of the drawings in this disclosure may only depict a portion of the entire device, and specific elements in the drawings are not drawn to actual scale.

This disclosure provides different examples to illustrate the technical features of different implementations of the disclosure. The configuration, quantity, and size of each component in the embodiment are for illustrative purposes and are not intended to limit the present disclosure. In addition, if the component numbers in the embodiments and the drawings are repeated, this is to simplify the description and does not imply the correlation between different embodiments.

Furthermore, the ordinal numbers used in the description and claims, such as "first", "second", etc., are used to modify the elements of the claims. They do not themselves imply or represent that the claimed component has any previous elements. Ordinal numbers do not represent the order between a certain request component and another request component, or the order in the manufacturing method. The use of these ordinal numbers is used to make one request component with a certain name and another request component with the same name Can make clear distinctions.

In the present disclosure, features of various embodiments may be mixed and matched arbitrarily as long as they do not violate the spirit of the invention or conflict.

In some embodiments of the present disclosure, the term "coupling" may include any direct or indirect electrical connection means unless otherwise defined.

In this article, the terms "approximately" and "approximately" usually mean within 20%, or within 10%, or within 5%, or within 3%, or within 2%, or within 1% of a given value. within, or within a range of 0.5%. The quantity given here is an approximate quantity, that is, even if "approximately" or "approximately" is not specifically stated, the meaning of "approximately" or "approximately" can still be implied.

The word "including" mentioned throughout the description and claims is an open-ended term, and therefore should be interpreted to mean "including but not limited to."

Furthermore, “connection” and “coupling” here include any direct and indirect connection means. Thus, when an element or film is referred to as being "connected" to another element or film, it can be directly connected to the other element or film or intervening elements or films may be present therebetween. When an element is referred to as being "directly connected" to another element or layer, there are no intervening elements or layers present. If it is described that a first device on a circuit is "directly coupled" or "directly electrically connected" to a second device, it means that there are only wires or passive components (such as resistors, capacitors) between the first device and the second device. etc.) connection, and no other electronic components are connected between the first device and the second device. When a first device in a circuit is described as being "coupled" or "electrically connected" to a second device, this may include other electronic components (eg, active components) between the first device and the second device.

In one embodiment, the electronic device may include a display device, a backlight device, an antenna device, a sensing device, a splicing device or a therapeutic and diagnostic device, but is not limited thereto. The electronic device may be a bendable or flexible electronic device. The display device may be a non-self-luminous display device or a self-luminous display device. The antenna device may be a liquid crystal type antenna device or a non-liquid crystal type antenna device, and the sensing device may be a sensing device that senses capacitance, light, heat energy or ultrasonic waves, but is not limited thereto. Electronic components may include passive components and active components, such as capacitors, resistors, inductors, diodes, transistors, etc. Diodes may include light emitting diodes or photodiodes. Light emitting diodes may include, for example, organic light emitting diodes (OLEDs), sub-millimeter light emitting diodes (mini LEDs), micro light emitting diodes (micro LEDs) or quantum dot light emitting diodes (quantum dot LEDs, QLEDs), but are not considered to be limit. The splicing device may be, for example, a display splicing device or an antenna splicing device, but is not limited thereto. It should be noted that the electronic device can be any of the above-mentioned arrangements and combinations, but is not limited thereto. In the following, a display device will be used as an electronic device to illustrate the disclosure, but the disclosure is not limited thereto.

FIG. 1 is a schematic diagram of an electronic device according to an embodiment of the present disclosure. Referring to FIG. 1 , the electronic device 100 may include at least a touch sensing unit 110 and a light source 120 .

The touch sensing unit 110 may include at least one touch sensor, but the disclosure is not limited thereto. The touch sensing unit 110 can sense a touch operation and generate a corresponding touch signal.

The light source 120 may be disposed adjacent to the touch sensing unit 110 . In this embodiment, the light source 120 may be a backlight module, and the light source 120 may include at least one light emitting diode 121, but the disclosure is not limited thereto. In addition, the above-mentioned light-emitting diode 121 is, for example, an organic light-emitting diode (OLED), a sub-millimeter light-emitting diode (mini LED), a micro-light emitting diode (micro LED), a quantum dot light-emitting diode (QLED) or a combination thereof, but the present disclosure is not limited thereto. .

In this embodiment, the electronic device 100 may further include a first substrate 130, a display unit 140, a second substrate 150, a first driving device 160, and a second driving device 170. The first substrate 130 may be disposed between the touch sensing unit 110 and the light source 120 . Furthermore, the touch sensing unit 110 may be disposed on the first side 131 of the first substrate 130, and the light source 120 may be disposed adjacent to the second side 132 of the first substrate 130, where the first side 131 may be connected to the second side 132 of the first substrate 130. Sides 132 are opposite. The electronic device 100 may include a liquid crystal display (LCD) panel, but the disclosure is not limited thereto.

As shown in FIG. 1 , the display unit 140 may be disposed on the touch sensing unit 110 , but the disclosure is not limited thereto. In some embodiments, the display unit 140 may be disposed adjacent to the touch sensing unit 110 . More specifically, when it is mentioned that "the display unit 140 is disposed adjacent to the touch sensing unit 110", it means that the display unit 140 may include components such as transistors, data signal lines, scanning signal lines, and pixel electrodes, and the transistors may Coupling the data signal line, the scanning signal line and the pixel electrode. The touch sensing unit 110 may include components such as touch sensing electrodes and signal reading lines, and the touch sensing electrodes may be coupled to the signal reading lines. At the same time, some elements of the display unit 140 and some elements of the touch sensing unit 110 may be arranged adjacent to each other and appear juxtaposed or at least partially overlapped in a top view. The second substrate 150 may be disposed on the display unit 140 and the touch sensing unit 110 . In this embodiment, the first substrate 130 and/or the second substrate 150 may be a glass substrate, but the disclosure is not limited thereto. In some embodiments, the first substrate 130 may also be a flexible substrate material, and the second substrate 150 may also be a flexible substrate material or a film layer covering the display unit 140 and the touch sensing unit 110 . Furthermore, the touch sensing unit 110 and the display unit 140 may be disposed between the second substrate 150 and the first substrate 130 .

The first driving device 160 may be disposed on the first side 131 of the first substrate 130 , and the first driving device 160 may be electrically connected to the display unit 140 and/or the touch sensing unit 110 to drive the display unit 140 and/or Touch sensing unit 110.

The second driving device 170 may be disposed on, but is not limited to, one side of the light source 120 relative to the second side 131 of the first substrate 130 , and the second driving device 170 may be electrically connected to the light source to drive the light source 120 . That is to say, the second driving device 170 can generate a driving signal to the light source 120 so that the light source 120 can generate corresponding light.

The above embodiments have described the internal components of the electronic device 100 and their configuration relationships. Some embodiments will be listed below to illustrate the driving signals used to drive the light sources.

FIG. 2 is a waveform diagram of a driving signal according to an embodiment of the present disclosure. Referring to FIG. 1 and FIG. 2 , the driving signal S1 of the light source 120 (ie, the driving signal generated by the second driving device 170 ) may have a voltage change period TP. In this embodiment, the voltage change period TP is, for example, a period during which the driving signal S1 changes from the lowest voltage value L to the highest voltage value H, or a period during which the driving signal S1 changes from the highest voltage value H to the lowest voltage value L. In addition, the above-mentioned driving signal S1 is, for example, a pulse width modulation (PWM) signal, but the present disclosure is not limited thereto.

The touch sensing unit 110 may perform sensing during the sensing period TS, and at least one voltage change period TP may at least partially overlap with the sensing period TS. That is to say, the touch sensing unit 110 can perform sensing during part of the voltage change period TP.

In some embodiments, the length of TP during the voltage change may be greater than or equal to 200 nanoseconds (ns) and less than or equal to 20,000 nanoseconds (ns) (200 nanoseconds≦TP≦20000 nanoseconds), but this disclosure does not Limited to this. In some embodiments, the length of the sensing period TS may be greater than or equal to 5000 nanoseconds and less than or equal to 3000000 nanoseconds (5000 nanoseconds≦TP≦3000000 nanoseconds), but the present disclosure is not limited thereto. In addition, in this embodiment, the length of the voltage change period TP is greater than the length of the sensing time TS, for example.

In some embodiments, the driving signal S1 also has a light source switching period TV. The length of the light source switching period TV may be between the length of the voltage change period TP and the length of the sensing period TS, and covers the shorter one of the voltage change period TP and the sensing period TS. For example, in this embodiment, the light source switching period TV covers the sensing period TS. More specifically, the starting point of the light source switching period TV can be located at the midpoint between the starting point of the voltage change period TP and the starting point of the sensing period TS, and the end point of the light source switching period TV can be located at the end point of the voltage changing period TP and the sensing period. The midpoint of the end point of period TS. Since the maximum voltage value H of the light source 120 is related to the number of the light-emitting diodes 121 connected in series, the voltage change speed of TV during the light source switching period will change with the number of the series-connected light-emitting diodes 121 . For example, if two light-emitting diodes 121 with a maximum voltage of 2.8 volts (Volt, V) are arranged in series in the light source 120, then the maximum voltage required to drive the light source 120 is 5.6 volts. In order to reduce the interference of the pulse of the driving signal S1 on the touch sensing unit 110 when driving the light source 120, the average change speed of the voltage is reduced in this embodiment. For example, during the light source switching period TV, the average voltage change speed of the driving signal S1 may be greater than 0 and less than 0.028 (volts/ns) (that is, 5.6 volts divided by 200 nanoseconds), but the disclosure is not limited thereto. Since in this embodiment, the light source switching period TV is located within the voltage change period TP, the voltage change speed of the driving signal S1 in the voltage change period TP is the same as the average voltage change speed of TV during the light source switch period.

Furthermore, in this embodiment, since the voltage change speed in the voltage change period TP is the same as the average voltage change speed of TV during the light source switching period, the average voltage change speed in TV during the light source switching period may be equal to the driving signal S1 The voltage change amount D1 (the voltage difference between the highest voltage value H and the lowest voltage value L of the drive signal S1) is divided by the length of the voltage change period TP (that is, the average voltage change speed = D1/TP). In addition, in this embodiment, the highest voltage value is, for example, 5.6 volts (V), and the lowest voltage value is, for example, 0V, but the disclosure is not limited thereto.

In some embodiments, the waveform of the driving signal S1 at the point where the voltage value starts to rise has an included angle θ1. In addition, the above-mentioned included angle θ1 may be greater than 90 degrees and less than or equal to 150 degrees (that is, 90 degrees < θ1 ≦ 150 degrees), but the disclosure is not limited thereto. In this embodiment, the above-mentioned included angle θ1 may be 140 degrees.

FIG. 3 is a waveform diagram of a driving signal according to another embodiment of the present disclosure. Please refer to FIG. 1 and FIG. 3 . The driving signal S1 of the light source 120 (ie, the driving signal generated by the second driving device 170 ) may have a voltage change period TP. In this embodiment, the voltage change period TP is, for example, a period during which the driving signal S1 changes from the highest voltage value H to the highest voltage value L, but the disclosure is not limited thereto. In addition, the voltage change period TP may also be a period during which the drive signal S1 changes from the lowest voltage value L to the highest voltage value H. In addition, the above-mentioned driving signal S1 is, for example, a pulse width modulation signal, but the present disclosure is not limited thereto.

The touch sensing unit 110 may perform sensing during the sensing period TS, and the voltage change period TP may at least partially overlap with the sensing period TS. That is to say, the touch sensing unit 110 can perform sensing during part of the voltage change period TP.

The difference between this embodiment and the embodiment shown in FIG. 2 is that the length of the voltage change period TP is, for example, shorter than the length of the sensing time TS, and the light source switching period TV covers the voltage change period TP. In addition, in this embodiment, the minimum voltage value L of the driving signal S1 is also increased to reduce the voltage variation D1 of the driving signal S1. The lowest voltage value L may be higher than 0 volts and lower than the voltage value at which the light-emitting diode 121 in the light source 120 starts to emit light. For example, when the light-emitting diode 121 starts to emit light from a voltage of 2 volts, and the light source 120 is configured with two light-emitting diodes 121 connected in series as a group, the lowest voltage value L of the driving signal should be higher than 0 volts and low. at 4 volts (equal to 2 volts times 2).

With different types of light-emitting diodes 121 and differences in the number of series-connected light-emitting diodes 121 , the highest voltage value H and the lowest voltage value L of the driving signal S1 will also be different. In this embodiment, the voltage variation D1 of the driving signal S1 may be 10% to 90% of the highest voltage value H of the driving signal S1, but the disclosure is not limited thereto. That is to say, in this embodiment, by increasing the minimum voltage value L of the driving signal S1, the voltage variation D1 is reduced, and the interference of the pulses of the driving signal S1 on the touch sensing unit 110 is further reduced.

During the light source switching period TV, the average voltage change speed may be equal to the voltage change D1 of the driving signal S1 divided by the length of the light source switching period TV (that is, the average voltage change speed = D1/TV). Since the voltage change amount D1 decreases and the light source switching period TV is longer than the voltage change period TP, the average voltage change speed also decreases. At the same time, the average voltage change speed of TV during the light source switching period is smaller than the voltage change speed in TP during the voltage change period.

In some embodiments, there is an angle θ2 between the lowest voltage value L of the driving signal S1 and the driving signal S1 during the voltage change period TP. In addition, the above-mentioned included angle θ2 may be greater than 90 degrees and less than or equal to 150 degrees (that is, 90 degrees < θ2 ≦ 150 degrees), but the disclosure is not limited thereto. In this embodiment, the above-mentioned included angle θ2 may be 110 degrees. Although in this embodiment, the voltage change speed in TP during the voltage change period may be faster than the voltage change in the embodiment shown in FIG. 2, due to the reduction of the voltage change amount D1, the impact of the pulse of the driving signal S1 on the touch control can still be reduced. interference in the sensing unit 110 .

FIG. 4 is a waveform diagram of a driving signal according to another embodiment of the present disclosure. The driving signal S1 of FIG. 4 substantially combines the driving signal S1 of the embodiment of FIG. 2 and the embodiment of FIG. 3 . That is to say, in FIG. 4 , the voltage change speed of the voltage change period TP is simultaneously reduced, and the voltage change amount D1 of the drive signal S1 is also reduced. Therefore, reference may be made to the relevant descriptions of FIG. 2 and FIG. 3 , and details will not be described again here.

FIG. 5 is a waveform diagram of a driving signal according to another embodiment of the present disclosure. This embodiment is substantially similar to the embodiment shown in FIG. 3 , so the similarities between the two will not be described again. The difference between this embodiment and the embodiment shown in FIG. 3 is that the touch sensing unit 110 can perform sensing in another sensing period TS2, and in the sensing period TS2, the driving signal S1 can have no voltage change, for example The driving signal S1 is at the lowest voltage value L or the voltage variation D1 is zero. Specifically, the sensing time TS2 may be located between the second pulse wave and the third pulse wave. In this way, the touch sensing unit 110 can perform sensing during the sensing period TS (that is, at least partially overlaps with the voltage change period TP) and/or the sensing period TS2 (that is, the period during which the driving signal S1 has no voltage change), so as to Increase convenience of use.

In FIG. 5 , the position of TS2 during the sensing period is an example embodiment of the present disclosure, but the present disclosure is not limited thereto. Since the frequency of the signal driving the touch sensing unit 110 and the frequency of the driving signal S1 driving the light source 120 may not be equal, part of the sensing period TS2 will be located between two adjacent pulses of the driving signal S1. In addition to the situation where the sensing time TS2 is located between the second pulse wave and the third pulse wave as shown in Figure 5, in some embodiments, the sensing period TS2 may also be located between the first pulse wave and the second pulse wave. between waves. In other embodiments, the driving signal S1 of the light source 120 can be changed as required (for example, the light source 120 has a variable frequency light emitting function), so the interval between the second pulse wave and the third pulse wave can be longer than the first pulse wave. The time between pulse wave and second pulse wave. The sensing time TS2 is located between the second pulse wave and the third pulse wave.

To sum up, in the electronic device according to the embodiment of the present disclosure, the driving signal transmitted through the light source has a voltage change period, the touch sensing unit performs sensing during the sensing period, and the voltage change period at least partially overlaps with the sensing period. In addition, during the light source switching period of the driving signal (the length of the light source switching period is between the length of the voltage change period and the length of the sensing period), the average voltage change speed of the driving signal is greater than 0 and less than 0.028 (V/ns ). In addition, the voltage change amount of the driving signal is 10% to 90% of the highest voltage value of the driving signal. Furthermore, there is an included angle between the lowest voltage value of the driving signal and the driving signal during the voltage change, and the included angle is greater than 90 degrees and less than or equal to 150 degrees. In this way, by changing the waveform of the driving signal, the coupling interference energy of the driving signal to the touch sensing unit can be reduced, or the impact on the sensing performance of the touch sensing unit can be reduced.

Although the present disclosure is disclosed in terms of embodiments, they are not intended to limit the scope of the disclosure. Any person skilled in the art can replace the features in several different embodiments without departing from the spirit and scope of the disclosure. The invention can be reorganized, mixed or slightly adjusted, combined, modified and modified to achieve other embodiments. Therefore, the scope of protection of the present disclosure shall be determined by the appended claims.

Claims (10)

1. An electronic device, characterized in that it includes: a touch sensing unit; and A light source is provided adjacent to the touch sensing unit; Wherein, a driving signal of the light source has a voltage change period, the touch sensing unit performs sensing during a sensing period, and the voltage change period at least partially overlaps with the sensing period. 2. The electronic device of claim 1, wherein the driving signal is a pulse width modulation signal. 3. The electronic device of claim 1, wherein the length of the voltage change period is greater than or equal to 200 nanoseconds and less than or equal to 20,000 nanoseconds. 4. The electronic device of claim 1, wherein the length of the sensing period is greater than or equal to 5000 nanoseconds and less than or equal to 3000000 nanoseconds. 5. The electronic device of claim 1, wherein the driving signal further has a light source switching period, and a starting point of the light source switching period is located between a starting point of the voltage change period and a starting point of the sensing period. The midpoint, the end point of the light source switching period is located at the midpoint of the end point of the voltage change period and the end point of the sensing period, and during the light source switching period, an average voltage change speed of the driving signal is greater than 0 and less than 0.028 (V/ns). 6. The electronic device of claim 1, wherein a voltage change amount of the driving signal is a difference between a highest voltage value and a lowest voltage value of the driving signal, and the voltage change amount is 10% to 90% of the highest voltage value. 7. The electronic device of claim 1, wherein the touch sensing unit performs sensing during another sensing period, and during the other sensing period, the driving signal has no voltage change. 8. The electronic device of claim 1, wherein the waveform of the driving signal at the point where the voltage value starts to increase has an included angle, and the included angle is greater than 90 degrees and less than or equal to 150 degrees. 9. The electronic device of claim 1, wherein the frequency of the driving signal is different from the frequency of a signal driving the touch sensing unit. 10. The electronic device of claim 1, further comprising a first substrate, wherein the touch sensing unit is disposed on the first substrate, and the first substrate is located between the touch sensing unit and the light source. between.