CN116893749A

CN116893749A - electronic device

Info

Publication number: CN116893749A
Application number: CN202211688241.0A
Authority: CN
Inventors: 罗焕亮; 冯瑞泰; 陈昱宏; 颜上明
Original assignee: Innolux Display Corp
Current assignee: Innolux Corp
Priority date: 2022-04-07
Filing date: 2022-12-27
Publication date: 2023-10-17

Abstract

An electronic device comprises a touch sensing unit and a light source. The light source is arranged adjacent to the touch sensing unit. The driving signal of the light source has a voltage variation period. The touch sensing unit senses during sensing. The voltage change period at least partially overlaps the sensing period.

Description

Electronic device

Technical Field

The disclosed embodiments relate to an electronic device, and more particularly, to an electronic device capable of reducing coupling interference energy.

Background

Known electronic devices may include a touch sensor and a light source, with the touch sensor disposed adjacent to the light source. However, the pulses of the driving signal for driving the light source may generate instant coupling energy, which may interfere with the operation of the touch sensor, so that the sensing performance of the touch sensor is affected. Therefore, there is a need for a new circuit architecture design that ameliorates the aforementioned problems.

Disclosure of Invention

The embodiment of the disclosure provides an electronic device, which comprises a touch sensing unit and a light source. The light source is arranged adjacent to the touch sensing unit. The driving signal of the light source has a voltage variation period. The touch sensing unit senses during sensing. The voltage change period at least partially overlaps the sensing period.

Drawings

Fig. 1 is a schematic diagram of an electronic device according to an embodiment of the 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.

[ symbolic description ]

100 electronic device

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 driving device

170 second driving means

S1 drive signal

TP during voltage Change

TS: sensing period

TS2 another sensing period

TV light source switching period

H maximum voltage value

L minimum voltage value

θ1, θ2-included angle

D1 Voltage variation

Detailed Description

The present disclosure will be described in more detail with reference to the accompanying drawings. In order to make it easier for the reader to understand and for the sake of brevity in the drawings, many of the drawings in this disclosure may depict only a portion of the entire apparatus, and the particular elements in the drawings are not drawn to actual scale.

The present disclosure provides different examples to illustrate the technical features of different embodiments of the present disclosure. The arrangement, number and size of the elements in the embodiments are for illustration, and are not intended to limit the disclosure. In addition, if the embodiment and the reference numerals of the elements in the drawings are repeated, the description is not intended to indicate the correlation between the different embodiments.

Furthermore, the use of ordinal numbers such as "first," "second," etc., in the description and the claims to modify a claim element does not by itself connote and indicate any preceding ordinal number for a requesting element, nor does it indicate the order in which a requesting element is ordered from another requesting element, or the order in which it is manufactured, and is used for distinguishing between a requesting element having a certain name and another requesting element having the same name.

In the present disclosure, features of the embodiments may be mixed and matched at will without departing from the spirit of the invention or conflicting.

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

As used herein, the terms "substantially" and "about" generally refer to a range within 20%, or within 10%, or within 5%, or within 3%, or within 2%, or within 1%, or within 0.5% of a given value. Where an amount is given herein as about, i.e., where "about" or "approximately" is not specified, the meaning of "about" or "approximately" may still be implied.

In the following description and in the claims, the terms "include" and "comprise" are used in an open-ended fashion, and thus should be interpreted to mean "include, but not limited to.

Further, "connected" and "coupled" herein include any direct or indirect connection. 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 film, there are no intervening elements or films present therebetween. If a first device on a circuit is described herein as being "directly coupled" or "directly electrically connected" to a second device, then this means that only wires or passive components (e.g., resistors, capacitors, etc.) are connected between the first device and the second device, and no other electronic components are connected between the first device and the second device. When a first device on a circuit is described herein as being "coupled" or "electrically connected" to a second device, it is intended that other electronic components (e.g., active components) may be included between the first device and the second device.

In an embodiment, the electronic device may include a display device, a backlight device, an antenna device, a sensing device, a stitching device or a therapeutic 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 type display device or a self-luminous type 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 for sensing capacitance, light, heat energy or ultrasonic waves, but is not limited thereto. The electronic components may include passive components and active components such as capacitors, resistors, inductors, diodes, transistors, and the like. The diode may comprise a light emitting diode or a photodiode. The light emitting diode may include, for example, but not limited to, an organic light emitting diode (organic light emitting diode, OLED), a sub-millimeter light emitting diode (mini LED), a micro LED, or a quantum dot LED (QLED). The splicing device can be, for example, a display splicing device or an antenna splicing device, but is not limited to this. It should be noted that the electronic device may be any of the above arrangements, but is not limited thereto. The display device is 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 disclosure. Referring to fig. 1, the electronic device 100 may at least include 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 may 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 the present embodiment, the light source 120 may be a backlight module (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 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. Further, the touch sensing unit 110 may be disposed on a first side 131 of the first substrate 130, and the light source 120 may be disposed adjacent to a second side 132 of the first substrate 130, wherein the first side 131 may be opposite to the second side 132. The electronic device 100 may include a liquid crystal display (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 the display unit 140 is disposed adjacent to the touch sensing unit 110, it is meant that the display unit 140 may include transistors, data signal lines, scan signal lines, pixel electrodes, and the like, and the transistors may be coupled to the data signal lines, the scan signal lines, and the pixel electrodes. The touch sensing unit 110 may include touch sensing electrodes, signal reading lines, and the like, and the touch sensing electrodes may be coupled to the signal reading lines. Meanwhile, part of the elements of the display unit 140 and part of the elements of the touch sensing unit 110 may be disposed adjacent to each other, and may be in a juxtaposed or at least partially overlapped state in a top view. The second substrate 150 may be disposed on the display unit 140 and the touch sensing unit 110. In the present embodiment, the first substrate 130 and/or the second substrate 150 may be glass substrates, but the disclosure is not limited thereto. In some embodiments, the first substrate 130 may be a flexible substrate material, and the second substrate 150 may be a flexible substrate material or a thin film layer covering the display unit 140 and the touch sensing unit 110. Further, 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, so as to drive the display unit 140 and/or the touch sensing unit 110.

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

Having described the internal components of the electronic device 100 and their configuration, some embodiments will be described below to illustrate driving signals for driving the light source.

Fig. 2 is a waveform diagram of a driving signal according to an embodiment of the present disclosure. Referring to fig. 1 and 2, the driving signal S1 of the light source 120 (i.e. the driving signal generated by the second driving device 170) may have a voltage variation period TP. In the present embodiment, the voltage change period TP is, for example, a period from the lowest voltage value L to the highest voltage value H of the driving signal S1 or a period from the highest voltage value H to the lowest voltage value L of the driving signal S1. The driving signal S1 is, for example, a pulse width modulation (pulse width modulation, PWM) signal, but the disclosure is not limited thereto.

The touch sensing unit 110 may sense during a sensing period TS, and at least one voltage variation period TP may at least partially overlap the sensing period TS. That is, the touch sensing unit 110 may sense during a portion of the voltage variation 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 20000 nanoseconds (ns) (200 ns+.tp+.20000 ns), although the disclosure is not limited thereto. 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), although the disclosure is not limited thereto. In addition, in the present embodiment, the length of the voltage change period TP is, for example, longer than the length of the sensing time TS.

In some embodiments, the drive 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 variation period TP and the length of the sensing period TS, and covers the shorter one of the voltage variation period TP and the length of the sensing period TS. For example, in the present embodiment, the light source switching period TV covers the sensing period TS. More specifically, the start point of the light source switching period TV may be located at a midpoint between the start point of the voltage variation period TP and the start point of the sensing period TS, and the end point of the light source switching period TV may be located at a midpoint between the end point of the voltage variation period TP and the end point of the sensing period TS. Since the highest voltage value H of the light source 120 is related to the number of series connection of the light emitting diodes 121, the voltage variation speed of the TV during switching of the light source may vary with the number of series connection of the light emitting diodes 121. For example, if two leds 121 with a maximum voltage of 2.8 volts (Volt, V) are arranged in series in the light source 120, the highest voltage value 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 to the touch sensing unit 110 when the light source 120 is driven, the average variation speed of the voltage is reduced in the present embodiment. For example, during a 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 (v/ns) (i.e., 5.6 v divided by 200 ns), but the present disclosure is not limited thereto. Since the light source switching period TV is located within the voltage variation period TP in the present embodiment, the voltage variation speed of the driving signal S1 in the voltage variation period TP is the same as the voltage average variation speed of the light source switching period TV.

Further, in the present embodiment, since the voltage variation speed in the voltage variation period TP is the same as the voltage average variation speed of the light source switching period TV, the voltage average variation speed in the light source switching period TV may be equal to the voltage variation D1 of the driving signal S1 (the voltage difference between the highest voltage value H and the lowest voltage value L of the driving signal S1) divided by the length of the voltage variation period TP (i.e. the voltage average variation speed=d1/TP). In addition, in the present embodiment, the highest voltage value is, for example, 5.6 volts (V), and the lowest voltage value is, for example, 0V, but the present disclosure is not limited thereto.

In some embodiments, the waveform of the driving signal S1 at the beginning of the rise of the voltage value has an included angle θ1. In addition, the included angle θ1 may be greater than 90 degrees and less than or equal to 150 degrees (i.e. 90 degrees < θ1+.150 degrees), but the disclosure is not limited thereto. In this embodiment, the 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. Referring to fig. 1 and 3, the driving signal S1 of the light source 120 (i.e. the driving signal generated by the second driving device 170) may have a voltage variation period TP. In the present embodiment, the voltage change period TP is, for example, a period in which the driving signal S1 is changed from the highest voltage value H to the highest voltage value L, but the present disclosure is not limited thereto. The voltage change period TP may be a period in which the drive signal S1 changes from the lowest voltage value L to the highest voltage value H. The driving signal S1 is, for example, a pulse width modulation signal, but the disclosure is not limited thereto.

The touch sensing unit 110 may sense during a sensing period TS, and the voltage variation period TP may at least partially overlap the sensing period TS. That is, the touch sensing unit 110 may sense during a portion of the voltage variation 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 smaller than the length of the sensing time TS, for example, and the light source switching period TV covers the voltage change period TP. In addition, the minimum voltage value L of the driving signal S1 is also increased in the present embodiment to reduce the voltage variation D1 of the driving signal S1. Wherein the lowest voltage value L may be higher than 0 volts and lower than the voltage value at which the light emitting diode 121 begins to emit light in the light source 120. For example, when the light emitting diodes 121 emit light starting from a voltage of 2 volts, and the light source 120 is arranged in a group of two light emitting diodes 121 connected in series, the lowest voltage value L of the driving signal should be higher than 0 volts and lower than 4 volts (equal to 2 volts multiplied by 2).

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

In the light source switching period TV, the voltage average change speed may be equal to the voltage change amount D1 of the driving signal S1 divided by the length of the light source switching period TV (i.e., the voltage average change speed=d1/TV). Since the voltage variation D1 decreases and the light source switching period TV is longer than the voltage variation period TP, the average voltage variation rate decreases. Meanwhile, the average change speed of the voltage of the light source switching period TV is smaller than the change speed of the voltage in the voltage change period TP.

In some embodiments, the lowest voltage value L of the driving signal S1 has an included angle θ2 with the driving signal S1 during the voltage variation period TP. In addition, the included angle θ2 may be greater than 90 degrees and less than or equal to 150 degrees (i.e. 90 degrees < θ2+.150 degrees), but the disclosure is not limited thereto. In this embodiment, the included angle θ2 may be 110 degrees. Although the voltage change speed in the voltage change period TP may be faster than the voltage change speed in the embodiment shown in fig. 2 in the present embodiment, the interference of the pulse of the driving signal S1 to the touch sensing unit 110 can be reduced due to the reduction of the voltage change amount D1.

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 is substantially combined with the driving signal S1 of the embodiment of fig. 2 and the embodiment of fig. 3. That is, in fig. 4, the voltage change speed of the voltage change period TP is reduced at the same time, and the voltage change amount D1 of the driving signal S1 is also reduced. Reference is therefore made to the description related to fig. 2 and 3, and no further description is given 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, and therefore, the description of the similarities will not be repeated. The difference between the embodiment of the present invention and the embodiment of fig. 3 is that the touch sensing unit 110 can sense in another sensing period TS2, and the driving signal S1 can have no voltage change in the sensing period TS2, for example, the driving signal S1 is at the lowest voltage value L or the voltage change amount D1 is zero. Specifically, the sensing time TS2 may be located between the second pulse and the third pulse. In this way, the touch sensing unit 110 can sense during the sensing period TS (i.e. at least partially overlapping with the voltage variation period TP) and/or the sensing period TS2 (i.e. the period in which the driving signal S1 has no voltage variation), so as to increase the convenience in use.

In fig. 5, the position of TS2 during sensing 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, the partial sensing period TS2 is located between two adjacent pulses of the driving signal S1. In addition to the case where the sensing time TS2 shown in FIG. 5 is between the second pulse and the third pulse, in some embodiments, the sensing period TS2 may also be between the first pulse and the second pulse. In other embodiments, the driving signal S1 of the light source 120 may be changed according to the requirement (e.g. the light source 120 has a variable frequency light emitting function), so that the interval between the second pulse and the third pulse may be longer than the interval between the first pulse and the second pulse. The sensing time TS2 is located between the second pulse and the third pulse.

In summary, in the electronic device according to the embodiments of the disclosure, the driving signal transmitted through the light source has a voltage variation period, the touch sensing unit senses during the sensing period, and the voltage variation period at least partially overlaps the sensing period. In addition, during a light source switching period of the driving signal (a length of the light source switching period is between a length of the voltage variation period and a length of the sensing period), a voltage average variation speed of the driving signal is greater than 0 and less than 0.028 (V/ns). The voltage variation of the driving signal is 10% to 90% of the highest voltage value of the driving signal. Furthermore, an included angle is formed between the lowest voltage value of the driving signal and the driving signal in the voltage variation period, and the included angle is more 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 influence on the sensing performance of the touch sensing unit can be reduced.

Although the present disclosure has been described with reference to certain embodiments, it should be understood that the present disclosure is not limited to the details of the embodiments, and that various changes, substitutions, rearrangements, mixtures, modifications and substitutions can be made herein by one skilled in the art without departing from the spirit and scope of the disclosure.

Claims

1. An electronic device, comprising:

a touch sensing unit; and

a light source arranged adjacent to the touch sensing unit;

the touch sensing unit senses in a sensing period, and the voltage variation period at least partially overlaps with the sensing period.

2. The electronic device of claim 1, wherein the driving signal is a pulse width modulated 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 20000 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, a start point of the light source switching period is located at a midpoint between a start point of the voltage change period and a start point of the sensing period, an end point of the light source switching period is located at a midpoint between an end point of the voltage change period and an end point of the sensing period, and a voltage average change speed of the driving signal is greater than 0 and less than 0.028 (v/ns) during the light source switching period.

6. The electronic device of claim 1, wherein a voltage variation of the driving signal is a difference between a highest voltage value and a lowest voltage value of the driving signal, and the voltage variation is 10% -90% of the highest voltage value.

7. The electronic device of claim 1, wherein the touch sensing unit senses during another sensing period, and the driving signal has no voltage variation during the another sensing period.

8. The electronic device of claim 1, wherein the waveform of the driving signal at the beginning of the rise of the voltage 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.