JP-7857375-B2 - Touch display device, touch drive circuit, and touch controller

Inventors

• キム フンベ
• ゴン ナムヨン
• キム スンチョル
• キム スンヨプ
• イ スンユプ
• キム ジョンスン

Assignees

• エルジー ディスプレイ カンパニー リミテッド

Dates

Publication Date

20260512

Application Date

20241107

Priority Date

20231115

Claims (19)

1. A touch sensor including multiple first touch electrodes and multiple second touch electrodes, A touch display device including a touch driving circuit for driving the touch sensor, The operating period of the touch display device includes a first touch sensing mode period in which a first touch drive signal having a first amplitude is applied to the touch sensor, and a second touch sensing mode period in which a second touch drive signal having a second amplitude different from the first amplitude is applied to the touch sensor. During the first touch sensing mode period, the first touch drive signals are applied sequentially or simultaneously to the plurality of first touch electrodes. A touch display device in which, during the second touch sensing mode period, the second touch drive signal is simultaneously applied to two or more first touch electrodes that are electrically connected to each other among the plurality of first touch electrodes, or the second touch drive signal is simultaneously applied to two or more second touch electrodes that are electrically connected to each other among the plurality of second touch electrodes.
2. The touch display device according to claim 1, wherein the second amplitude is greater than the first amplitude.
3. The second touch sensing mode period includes a first sub-sensing period and a second sub-sensing period that do not overlap with each other. During the first sub-sensing period within the second touch sensing mode period, the second touch drive signal is simultaneously applied to two or more first touch electrodes that are electrically connected to each other among the plurality of first touch electrodes. The touch display device according to claim 1, wherein during the second sub-sensing period within the second touch sensing mode period, the second touch drive signal is simultaneously applied to two or more second touch electrodes that are electrically connected to each other among the plurality of second touch electrodes.
4. The aforementioned touch drive circuit is Two or more amplifiers, Two or more charge amplifiers, A first control switch circuit that controls all or part of the two or more first touch electrodes to be connected to all or part of the two or more amplifiers, or controls all or part of the two or more first touch electrodes to be connected to all or part of the two or more charge amplifiers, or controls the two or more first touch electrodes to be separated from the two or more amplifiers and the two or more charge amplifiers, The touch display device according to claim 1, further comprising a second control switch circuit that controls all or some of the two or more second touch electrodes to be connected to all or some of the two or more charge amplifiers, or controls all or some of the two or more second touch electrodes to be disconnected from the two or more charge amplifiers.
5. During the first touch sensing mode period, The first control switch circuit sequentially connects the two or more first touch electrodes and the two or more amplifiers so that they correspond to each other. The second control switch circuit connects the two or more second touch electrodes and the two or more charge amplifiers in correspondence with each other. The second touch sensing mode period includes a first sub-sensing period and a second sub-sensing period that do not overlap with each other. During the first subsensing period, The first control switch circuit connects the two or more first touch electrodes to a specific charge amplifier among the two or more charge amplifiers, The second control switch circuit separates the two or more second touch electrodes from the two or more charge amplifiers. During the second subsensing period, The first control switch circuit separates the two or more first touch electrodes from the two or more amplifiers and the two or more charge amplifiers. The touch display device according to claim 4, wherein the second control switch circuit connects the two or more second touch electrodes to the specific charge amplifier.
6. Each of the two or more charge amplifiers includes an operational amplifier having a first input node, a second input node, and an output node, and a feedback capacitor between the second input node and the output node. The particular charge amplifier further includes an additional feedback capacitor between the second input node and the output node, and a capacitance control switch that controls the connection between one of the second input node and the output node and the additional feedback capacitor. When the capacitance control switch is turned on, the additional feedback capacitor is connected in parallel with the feedback capacitor between the second input node and the output node. The touch display device according to claim 5, wherein when the capacitance control switch is turned off, the additional feedback capacitor is disconnected from the feedback capacitor between the second input node and the output node.
7. During the first touch sensing mode period, The aforementioned capacity control switch is in the turned-off state. A reference voltage whose voltage level does not fluctuate over time is applied to the first input node of each of the two or more charge amplifiers. During the second touch sensing mode period, The aforementioned capacity control switch is in the turned-on state. The touch display device according to claim 6, wherein the first input node of the specific charge amplifier is to be supplied with the second touch drive signal having a voltage level that varies over time and the second amplitude.
8. A display panel including multiple subpixels and the touch sensor, A display driving circuit that drives the plurality of subpixels, A touch controller that supplies a second mode control signal to the touch drive circuit, The system further includes a display controller that controls the display driving circuit and supplies a first mode control signal to the touch controller, The operating period of the touch display device includes a display mode period and a touch sensing mode period. The touch sensing mode period includes the first touch sensing mode period and the second touch sensing mode period. The touch display device according to claim 1, wherein the display mode period, the first touch sensing mode period, and the second touch sensing mode period are separated by the first mode control signal and the second mode control signal.
9. The first mode control signal is a control signal for distinguishing between the display mode period and the touch sensing mode period. The touch display device according to claim 8, wherein the second mode control signal is a control signal for distinguishing between the first touch sensing mode period and the second touch sensing mode period.
10. The first mode control signal is a vertical synchronization signal for dividing a single display frame period into an active period and a blank period, wherein the active period is the display mode period and the blank period is the touch sensing mode period. The touch display device according to claim 8, wherein the second mode control signal is a hover enable signal for enabling the hover touch sensing mode, which is the second touch sensing mode.
11. The first mode control signal includes a first signal section having a first level voltage and a second signal section having a second level voltage different from the first level voltage. The second mode control signal includes a third signal section having a third level voltage and a fourth signal section having a fourth level voltage different from the third level voltage. During the aforementioned display mode period, The first mode control signal has the second level voltage, The second mode control signal has the third level voltage, During the first touch sensing mode period, The first mode control signal has the first level voltage, The second mode control signal has the third level voltage, During the second touch sensing mode period, The first mode control signal has the first level voltage, The touch display device according to claim 8, wherein the second mode control signal has the fourth level voltage.
12. The first touch sensing mode period is a period for sensing touches that come into contact with the screen. The touch display device according to claim 1, wherein the second touch sensing mode period is a period for sensing a hover touch that does not touch the screen.
13. A display panel including multiple subpixels and multiple touch electrodes, A display driving circuit that drives the plurality of subpixels, A touch drive circuit that supplies a touch drive signal to at least one of the plurality of touch electrodes, A touch controller that supplies a second mode control signal to the touch drive circuit, A touch display device including a display controller that controls the display driving circuit and supplies a first mode control signal to the touch controller, The operating period of the touch display device includes a display mode period and a touch sensing mode period. The touch sensing mode period includes a first touch sensing mode period and a second touch sensing mode period. The display mode period, the first touch sensing mode period, and the second touch sensing mode period are separated by the first mode control signal and the second mode control signal . The first mode control signal includes a first signal section having a first level voltage and a second signal section having a second level voltage different from the first level voltage. The second mode control signal includes a third signal section having a third level voltage and a fourth signal section having a fourth level voltage different from the third level voltage. During the aforementioned display mode period, The first mode control signal has the second level voltage, The second mode control signal has the third level voltage, During the first touch sensing mode period, The first mode control signal has the first level voltage, The second mode control signal has the third level voltage, During the second touch sensing mode period, The first mode control signal has the first level voltage, The second mode control signal has the fourth level voltage, Touch display device.
14. The first mode control signal is a control signal for dividing the operating period into the display mode period and the touch sensing mode period. The touch display device according to claim 13, wherein the second mode control signal is a control signal for dividing the touch sensing mode period into a first touch sensing mode period and a second touch sensing mode period.
15. Two or more amplifiers corresponding to multiple first touch electrodes, Multiple second touch electrodes, each corresponding to two or more charge amplifiers, each containing a feedback capacitor, A first control switch circuit that controls all or some of the plurality of first touch electrodes to be connected to all or some of the two or more amplifiers, or controls all or some of the plurality of first touch electrodes to be connected to all or some of the two or more charge amplifiers, or controls the plurality of first touch electrodes to be isolated from the two or more amplifiers and the two or more charge amplifiers, A touch drive circuit including a second control switch circuit that controls all or some of the plurality of second touch electrodes to be connected to all or some of the two or more charge amplifiers, or controls all or some of the plurality of second touch electrodes to be isolated from the two or more charge amplifiers, The operating period of the touch drive circuit includes a first touch sensing mode period and a second touch sensing mode period that do not overlap with each other, and the second touch sensing mode period includes a first sub-sensing period and a second sub-sensing period that do not overlap with each other. During the first sub-sensing period, two or more of the plurality of first touch electrodes are electrically connected to each other. A touch drive circuit in which two or more of the plurality of second touch electrodes are electrically connected to each other during the second subsensing period.
16. The touch drive circuit according to claim 15 , wherein during the first touch sensing mode period, the two or more amplifiers are configured to output a first touch drive signal having a first amplitude to the first touch electrode.
17. The touch driving circuit according to claim 16, wherein during the second touch sensing mode period, a second touch driving signal having a voltage level that changes over time and a second amplitude is applied to one of the two or more charge amplifiers.
18. During the first touch sensing mode period, The first control switch circuit sequentially connects the two or more first touch electrodes and the two or more amplifiers to each other, The second control switch circuit connects the two or more second touch electrodes and the two or more charge amplifiers in correspondence with each other. The second touch sensing mode period includes a first sub-sensing period and a second sub-sensing period that do not overlap with each other. During the first subsensing period, The first control switch circuit connects the two or more first touch electrodes to a specific charge amplifier among the two or more charge amplifiers, The second control switch circuit separates the two or more second touch electrodes from the two or more charge amplifiers. During the second subsensing period, The first control switch circuit separates the two or more first touch electrodes from the two or more amplifiers and the two or more charge amplifiers. The touch drive circuit according to claim 15 , wherein the second control switch circuit connects the two or more second touch electrodes to the specific charge amplifier.
19. Each of the two or more charge amplifiers further includes an operational amplifier having a first input node, a second input node, and an output node. The feedback capacitor is connected between the second input node and the output node. The particular charge amplifier further includes an additional feedback capacitor and a capacitance control switch connected between the second input node and the output node, When the capacitance control switch is turned on, the additional feedback capacitor is connected in parallel with the feedback capacitor between the second input node and the output node. The touch drive circuit according to claim 18 , wherein when the capacitance control switch is turned off, the additional feedback capacitor is disconnected from the feedback capacitor between the second input node and the output node.

Description

The embodiments of this disclosure relate to a touch display device, a touch driving circuit, and a touch controller. In recent years, touch display devices have been developed that sense user touches from fingers or pens and provide touch-based input processing functions. To provide a wider range of application functions for such touch display devices, there is a demand for various forms of touch sensing. For example, wearable devices may require not only the ability to sense contact touches (when the user touches the screen) but also the ability to sense non-contact touches (hover touches) when the user is not touching the screen. This is a system configuration diagram of a touch display device according to an embodiment of the present disclosure.This shows a touch sensor for a touch display device according to an embodiment of the present disclosure.This invention illustrates a touch sensing system for a touch display device according to an embodiment of the present disclosure.This diagram shows the drive timing of a touch display device according to an embodiment of the present disclosure.The operating mode definition table for a touch display device according to an embodiment of this disclosure is shown.A touch drive circuit according to an embodiment of the present disclosure is shown.This invention illustrates a charge amplifier in a touch drive circuit according to an embodiment of the present disclosure.This is a flowchart illustrating the operation method of a touch display device according to an embodiment of the present disclosure.This diagram shows the operating status when the operating period of the touch display device according to the embodiment of this disclosure is the first touch sensing mode period.This diagram shows the operating status when the operating period of the touch display device according to the embodiment of this disclosure is the first touch sensing mode period.This diagram shows the operating status when the operating period of the touch display device according to the embodiment of this disclosure is the first sub-sensing period within the second touch sensing mode period.This diagram shows the operating status when the operating period of the touch display device according to the embodiment of this disclosure is the first sub-sensing period within the second touch sensing mode period.This diagram shows the operating status when the operating period of the touch display device according to the embodiment of this disclosure is the second sub-sensing period within the second touch sensing mode period.This diagram shows the operating status when the operating period of the touch display device according to the embodiment of this disclosure is the second sub-sensing period within the second touch sensing mode period.This diagram briefly illustrates the operation of the touch drive circuit during the touch sensing mode period according to the embodiments of this disclosure.This diagram briefly illustrates the operation of the touch drive circuit during the touch sensing mode period according to the embodiments of this disclosure.This diagram briefly illustrates the operation of the touch drive circuit during the touch sensing mode period according to the embodiments of this disclosure.This shows multiple channel binding group regions included in a touch sensor according to an embodiment of the present disclosure.A touch drive circuit according to an embodiment of the present disclosure is shown.The touch drive circuit during the first touch sensing mode period according to an embodiment of the present disclosure is shown.The touch drive circuit during the first sub-sensing period within the second touch sensing mode period according to the embodiment of this disclosure is shown.The touch drive circuit during the second sub-sensing period within the second touch sensing mode period according to the embodiment of this disclosure is shown. Hereinafter, some embodiments of this disclosure will be described in detail with reference to illustrative drawings. In assigning reference numerals to components in each drawing, the same reference numerals may be used for the same component, even if they appear in different drawings, whenever possible. In describing this disclosure, if a specific description of a related known configuration or function is deemed to obscure the gist of this disclosure, such detailed description may be omitted. Where "includes," "has," "performs," etc., as used herein, other parts may be added unless "only" is used. Where a component is expressed singularly, it may include multiple components unless otherwise explicitly stated. Furthermore, terms such as First, Second, A, B, (a), and B may be used to describe the components of this disclosure. These terms are used to distinguish a component from other components, and do not limit the nature, order, procedure, or number of the components. In descriptions of the spatial relationships between components, when it