Touch display panel and sensing method thereof

Abstract

A touch display panel and a sensing method thereof. The touch display panel includes a control circuit, a column driving circuit, a row driving circuit, a common electrode driving / sensing circuit, a plurality of gate electrode lines, a plurality of source electrode lines, a plurality of common electrode lines, and a plurality of liquid crystal pixels. The common electrode driving / sensing circuit is coupled to the common electrode lines. The control circuit controls the touch display panel to enter a standby gesture wake-up mode. In a first sensing period, the common electrode driving / sensing circuit drives the common electrode lines with a plurality of first pulses oscillating between a first voltage range, and in a second sensing period, drives the common electrode lines with a plurality of second pulses oscillating between a second voltage range different from the first voltage range.

Description

Technical Field

[0001] This invention relates to a touch display technology, and more particularly to a touch display panel and its sensing method. Background Technology

[0002] Today, with the rapid development of semiconductor technology, the functionality of portable electronic devices is constantly improving, making them indispensable household appliances. Furthermore, due to the size limitations of portable electronic devices, touch modules have become an essential operating interface. By using touch modules to sense and wake up gestures, the need for physical buttons in portable electronic devices is reduced, thus protecting them.

[0003] However, the touch module senses and wakes up gestures when the display module is in sleep mode, which affects the operation of the display module and can even cause polarization of the liquid crystal in the LCD module. Therefore, a new sensing method is needed. Summary of the Invention

[0004] This invention provides a touch display panel and its sensing method, which can reduce touch noise caused by sensing start gestures during standby without avoiding liquid crystal polarization.

[0005] The touch display panel of the present invention includes a control circuit, a column driving circuit, a row driving circuit, a common electrode driving / sensing circuit, a plurality of gate electrode lines, a plurality of source electrode lines, a plurality of common electrode lines, and a plurality of liquid crystal pixels. Each liquid crystal pixel is individually coupled to a corresponding gate electrode line, a corresponding source electrode line, and a corresponding common electrode line. The column driving circuit is coupled to these gate electrode lines. The row driving circuit is coupled to the source electrode lines. The common electrode driving / sensing circuit is coupled to the common electrode lines. The control circuit controls the column driving circuit, the row driving circuit, and the common electrode driving / sensing circuit, and controls the touch display panel to enter a standby gesture wake-up mode. During a first sensing period, the common electrode driving / sensing circuit drives the common electrode lines with a plurality of first pulses oscillating between a first voltage range. During a second sensing period different from the first sensing period, the common electrode driving / sensing circuit drives these common electrode lines with a plurality of second pulses oscillating between a second voltage range different from the first voltage range, wherein the common voltage is located between the first voltage range and the second voltage range.

[0006] The sensing method for a touch display panel of the present invention includes the following steps: Determining that the touch display panel has entered a standby gesture wake-up mode. During a first sensing period, driving multiple common electrodes of the touch display panel with multiple first pulses oscillating between a first voltage range via a common electrode driving / sensing circuit of the touch display panel. During a second sensing period different from the first sensing period, driving these common electrode lines with multiple second pulses oscillating between a second voltage range different from the first voltage range via the common electrode driving / sensing circuit, wherein the common voltage is located between the first voltage range and the second voltage range.

[0007] Based on the above, the touch display panel and sensing method of this invention drive the common electrode line with a voltage range based on a common voltage during different sensing periods, so that the average voltage of the common electrode line approaches the common voltage. This reduces touch noise caused by sensing activation gestures during standby while avoiding liquid crystal polarization.

[0008] To make the above features and advantages of the present invention more apparent and understandable, specific embodiments are described below in conjunction with the accompanying drawings. Attached Figure Description

[0009] Figure 1 This is a schematic diagram of a touch display panel according to a first embodiment of the present invention.

[0010] Figure 2 This is a schematic diagram of the driving waveform of a touch display panel according to an embodiment of the present invention.

[0011] Figure 3 This is a schematic diagram of the state machine of a touch display panel according to an embodiment of the present invention.

[0012] Figure 4 This is a flowchart of a sensing method for a touch display panel according to an embodiment of the present invention.

[0013] In the attached figures, the following labels are used:

[0014] 100: Touch display panel

[0015] 110: Control Circuit

[0016] 120: Column drive circuit

[0017] 130: Horizontal drive circuit

[0018] 140: Common electrode drive / sensing circuit

[0019] AGG: During electrode grounding

[0020] AVDD: System High Voltage

[0021] AVEE: System low voltage

[0022] CME: Common Electrode Line

[0023] DTE: Source Electrode Line

[0024] FM1~FM3: During the broadcast

[0025] GSC: Gate Control Signal

[0026] LGE: Gate electrode line

[0027] NSE1: Second Sensing Period

[0028] PLS1: First pulse

[0029] PLS2: Second Pulse

[0030] PLS3: Third Pulse

[0031] PLS4: Fourth Pulse

[0032] PLS5: Fifth Pulse

[0033] PSE1: First Sensing Period

[0034] PSE2: Third Sensing Period

[0035] PXE: Liquid Crystal Pixel

[0036] RSC: Source Control Signal

[0037] S00: Normal state

[0038] S01: Sleep mode

[0039] S02: Gesture wake-up state

[0040] S03: Deep standby state

[0041] VGHO: Gate High Voltage

[0042] VGLO: Gate Low Voltage

[0043] S101, S103, S105: Steps Detailed Implementation

[0044] Unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. It will be further understood that terms such as those defined in commonly used dictionaries should be interpreted as having meanings consistent with their meanings in the context of the relevant technology and this invention, and will not be interpreted as having idealized or overly formal meanings unless expressly defined herein.

[0045] It should be understood that although the terms “first,” “second,” “third,” etc., may be used herein to describe various elements, components, regions, layers, and / or parts, these elements, components, regions, and / or parts should not be limited by these terms. These terms are used only to distinguish one element, component, region, layer, or part from another. Therefore, the “first element,” “component,” “region,” “layer,” or “part” discussed below may be referred to as a second element, component, region, layer, or part without departing from the teachings of this document.

[0046] The terminology used herein is for the purpose of describing particular embodiments only and is not restrictive. As used herein, unless the content clearly indicates otherwise, the singular forms “a,” “an,” and “the” are intended to include the plural forms, including “at least one.” “Or” means “and / or.” As used herein, the term “and / or” includes any and all combinations of one or more of the associated listed items. It should also be understood that, when used in this specification, the terms “comprising” and / or “comprising” specify the presence of the stated features, areas, integrals, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, areas, integrals, steps, operations, elements, components, and / or combinations thereof.

[0047] Figure 1 This is a system schematic diagram of a touch display panel according to a first embodiment of the present invention. Please refer to... Figure 1 In this embodiment, the touch display panel 100 includes a control circuit 110, a column driving circuit 120, a row driving circuit 130, a common electrode driving / sensing circuit 140, a plurality of gate electrode lines LGE, a plurality of source electrode lines DTE, a plurality of common electrode lines CME, and a plurality of liquid crystal pixels PXE.

[0048] Each liquid crystal pixel PXE is individually coupled to its corresponding gate electrode line LGE, its corresponding source electrode line DTE, and its corresponding common electrode line CME. Column drive circuit 120 is coupled to the gate electrode line LGE to enable the drive signal on the gate electrode line LGE column by column, thereby turning on the liquid crystal pixel PXE column by column. Row drive circuit 130 is coupled to the source electrode line DTE to transmit the pixel voltage to the turned-on liquid crystal pixel PXE through the source electrode line DTE.

[0049] A common electrode driving / sensing circuit 140, coupled to a common electrode line CME, is used to set the voltage level of the common electrode line CME to a common voltage (e.g., ground voltage) during display and to drive the common electrode line CME for touch sensing during sensing. A control circuit 110 is coupled to the column driving circuit 120, the row driving circuit 130, and the common electrode driving / sensing circuit 140, and controls these circuits.

[0050] By controlling the column drive circuit 120, the row drive circuit 130, and the common electrode drive / sensing circuit 140, the control circuit 110 can control the touch display panel 100 to enter one of the following modes: normal mode, sleep mode, standby gesture wake-up mode, and deep standby mode.

[0051] In this embodiment, when the control circuit 110 controls the touch display panel 100 to enter the standby gesture wake-up mode, the control circuit 110 controls the common electrode driving / sensing circuit 140 to drive the common electrode lines CME with a plurality of first pulses oscillating between a first voltage range during at least one sensing period, and to drive the common electrode lines CME with a plurality of second pulses oscillating between a second voltage range different from the first voltage range during at least one additional sensing period, wherein the common voltage is located between the first voltage range and the second voltage range.

[0052] By driving the common electrode line CME with a voltage range differentiated by a common voltage during different sensing periods, the average voltage of the common electrode line CME will approach the common voltage. This reduces touch noise caused by sensing activation gestures during standby without liquid crystal polarization.

[0053] In this embodiment, the control circuit 110 provides at least a gate high voltage VGHO, a gate low voltage VGLO, and a gate control signal GSC to the column drive circuit 120 to control the column drive circuit 120. Furthermore, the control circuit 110 provides at least a source control signal RSC to the row drive circuit 130 to control the row drive circuit 130.

[0054] Figure 2 This is a schematic diagram of the driving waveform of a touch display panel according to an embodiment of the present invention. Please refer to... Figure 1 and Figure 2In this embodiment, the touch display panel 100 operates in standby gesture wake-up mode, that is, the touch display panel 100 does not display images, but performs touch sensing, but does not sense touch points. Furthermore, three screen periods FM1 to FM3 are shown here as an example. Each screen period FM1 to FM3 includes a sensing period (e.g., PSE1, NSE1, PSE2) and multiple electrode grounding periods AGG, wherein the electrode grounding periods AGG are individually located between the sensing periods (e.g., PSE1, NSE1, PSE2).

[0055] During the first sensing period PSE1, the common electrode drive / sensing circuit 140 drives all common electrode lines CME with a plurality of first pulses PLS1 oscillating between a first voltage range located between the system high voltage AVDD and the ground voltage. Furthermore, the control circuit 110 forms a plurality of third pulses PLS3 oscillating between the first voltage range on the gate high voltage VGHO provided to the column drive circuit 120, and forms a plurality of fourth pulses PLS4 oscillating between the ground voltage and the system low voltage AVEE on the gate low voltage VGLO provided to the column drive circuit 120. Next, the control circuit 110 controls the row drive circuit 130 to form a plurality of fifth pulses PLS5 oscillating between the system high voltage AVDD and the system low voltage AVEE on these source electrode lines DTE, or controls the row drive circuit 130 to present a high impedance state at its output. In this embodiment of the invention, the first voltage range may be equal to the second voltage range.

[0056] During electrode grounding in the AGG, the common electrode drive / sensing circuit 140 can drive all common electrode lines CMEs with the ground voltage. However, in other embodiments, the common electrode drive / sensing circuit 140 can drive all common electrode lines CMEs with the system low voltage AVEE. This embodiment of the invention is not limited thereto.

[0057] During the second sensing period NSE1 following the first sensing period PSE1, the common electrode drive / sensing circuit 140 drives all common electrode lines CME with multiple second pulses PLS2 oscillating between a second voltage range (ground voltage and a system low voltage AVEE). At this time, the control circuit 110 also generates multiple third pulses PLS3 on the gate high voltage VGHO and multiple fourth pulses PLS4 on the gate low voltage VGLO. Furthermore, the row drive circuit 130 generates multiple fifth pulses PLS5 on these source electrode lines DTE, or controls the row drive circuit 130 to present a high impedance state at its output.

[0058] In the third sensing period PSE2, which follows the second sensing period NSE1, the common electrode drive / sensing circuit 140 operates identically to the first sensing period PSE1, driving all common electrode lines CMEs with a first pulse PLS1. Similarly, in the fourth sensing period, which follows the third sensing period PSE2, the common electrode drive / sensing circuit 140 drives these common electrode lines CMEs with a second pulse PLS2, identical to the second sensing period NSE1.

[0059] In this embodiment, the second sensing period NSE1 using the second pulse PLS2 is located between the first sensing period PSE1 using the first pulse PLS1 and the third sensing period PSE2, and the third sensing period PSE2 using the first pulse PLS1 is located between the second sensing period NSE1 using the second pulse PLS2 and the fourth sensing period. That is, during the sensing periods (such as PSE1, NSE1, PSE2), the first pulse PLS1 and the second pulse PLS2 are used alternately to drive all common electrode lines CME.

[0060] In embodiments of the present invention, multiple sensing periods (e.g., PSE1, PSE2) using the first pulse PLS1 can be replaced by multiple sensing periods (e.g., NSE1) using the second pulse PLS2. For example, if the image periods FM2 and FM3 are swapped, then the sensing periods PSE1 and PSE2 using the first pulse PLS1 are replaced by the sensing period NSE1 using the second pulse PLS2. In other words, the third sensing period PSE2 using the first pulse PLS1 is located between the first sensing period PSE1 using the first pulse PLS1 and the second sensing period NSE1 using the second pulse PLS2, and the second sensing period NSE1 using the second pulse PLS2 is located between the third sensing period PSE2 using the first pulse PLS1 and the fourth sensing period using the second pulse PLS2.

[0061] In embodiments of the present invention, in standby gesture wake-up mode, the electronic device (not shown) configuring the touch display panel 100 operates in sleep mode. Therefore, the system high voltage AVDD can be set to the system standby high voltage (VSP), and the system low voltage AVEE can be set to the system standby low voltage (VSN). However, the embodiments of the present invention are not limited thereto. For example, when the electronic device (not shown) configuring the touch display panel 100 operates in normal mode, the system high voltage AVDD can be approximately 5 volts, and the system low voltage AVEE can be approximately -5 volts; when the electronic device (not shown) configuring the touch display panel 100 operates in sleep mode, the system high voltage AVDD can be approximately 3 volts, and the system low voltage AVEE can be approximately -3 volts.

[0062] Figure 3 This is a schematic diagram of the state machine of a touch display panel according to an embodiment of the present invention. Please refer to... Figure 1 and Figure 4 In this embodiment, after the touch display panel 100 completes initialization, it generally enters a normal state S00. At this time, both the display and touch states are normal, meaning the image is displayed and the user's touch points are sensed. When the touch display panel 100 receives a user command or meets predetermined conditions (e.g., standby time exceeds a predetermined period), it enters a sleep state S01. At this time, the touch display panel 100 can confirm whether to enter gesture wake-up mode through system parameters. If the confirmation result is negative, it remains in sleep state S01; if the confirmation result is positive, it enters gesture wake-up state S02. In gesture wake-up state S02, the display state is sleep, but the touch state is in standby gesture wake-up mode, meaning the image is not displayed, but user touch is sensed. Furthermore, in sleep state S01 and gesture wake-up state S02, when the operation of the touch display panel 100 meets predetermined conditions, it enters a deep standby state S03.

[0063] In gesture wake-up state S02, when a user's touch is sensed, system parameters are modified, and the system returns to sleep state S01. Then, through the change in system parameters, the touch display panel 100 returns from sleep state S01 to normal state S00. In deep standby state S03, when the touch display panel 100 receives a user command, it enters sleep state S01.

[0064] Figure 4 This is a flowchart of a sensing method for a touch display panel according to an embodiment of the present invention. Please refer to... Figure 4 In this embodiment, the sensing method of the touch display panel includes the following steps. In step S101, it is determined that the touch display panel has entered a standby gesture wake-up mode. In step S103, during the first sensing period, all common electrodes of the touch display panel are driven by a plurality of first pulses oscillating within a first voltage range via the common electrode driving / sensing circuit of the touch display panel. In step S105, during the second sensing period, all common electrode lines are driven by a plurality of second pulses oscillating within a second voltage range via the common electrode driving / sensing circuit, wherein the second sensing period is different from the first sensing period, and the second voltage range is different from the first voltage range. The order of steps S101, S103, and S105 is for illustrative purposes and is not intended to limit the scope of this embodiment. Details of steps S101, S103, and S105 can be found in [reference needed]. Figures 1 to 3 As shown in the examples, they will not be repeated here.

[0065] In summary, the touch display panel and sensing method of this invention drive the common electrode line with a voltage range based on a common voltage during different sensing periods, so that the average voltage of the common electrode line approaches the common voltage. This reduces touch noise caused by sensing activation gestures during standby while avoiding liquid crystal polarization.

[0066] Although the present invention has been disclosed above by way of embodiments, it is not intended to limit the present invention. Anyone skilled in the art can make some modifications and refinements without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. A touch display panel, characterized in that, include: Multiple gate electrode lines; Multiple source electrode lines; Multiple common electrode lines; Multiple liquid crystal pixels, each individually coupled to a corresponding gate electrode line, a corresponding source electrode line, and a corresponding common electrode line; A drive circuit is coupled to these gate electrode lines; A drive circuit is coupled to these source electrode lines; A common electrode drive / sensing circuit is coupled to these common electrode lines; as well as A control circuit controls the column drive circuit, the row drive circuit, and the common electrode drive / sensing circuit, and controls the touch display panel to enter a standby gesture wake-up mode. During a first sensing period, the common electrode driving / sensing circuit drives the common electrode lines with a plurality of first pulses oscillating within a first voltage range. During a second sensing period different from the first sensing period, the common electrode driving / sensing circuit drives the common electrode lines with a plurality of second pulses oscillating within a second voltage range different from the first voltage range, wherein a common voltage lies between the first voltage range and the second voltage range. During multiple electrode grounding periods, the common electrode drive / sensing circuit drives the common electrode lines with a system low voltage or the common voltage, wherein the electrode grounding periods are individually located between the first sensing period, the second sensing period, a third sensing period, and a fourth sensing period.

2. The touch display panel as described in claim 1, characterized in that, During the third sensing period, the common electrode drive / sensing circuit drives the common electrode lines with the first pulses, and during the fourth sensing period, the common electrode drive / sensing circuit drives the common electrode lines with the second pulses.

3. The touch display panel as described in claim 2, characterized in that, The second sensing period is located between the first sensing period and the third sensing period, and the third sensing period is located between the second sensing period and the fourth sensing period.

4. The touch display panel as described in claim 2, characterized in that, The third sensing period is located between the first sensing period and the second sensing period, and the second sensing period is located between the third sensing period and the fourth sensing period.

5. The touch display panel as described in claim 1, characterized in that, The first voltage range is located between a system high voltage and the common voltage, and the second voltage range is located between the common voltage and a system low voltage.

6. The touch display panel as described in claim 5, characterized in that, The first voltage range is equal to the second voltage range.

7. The touch display panel as described in claim 5, characterized in that, During the first sensing period and the second sensing period, the control circuit forms a plurality of third pulses oscillating within the first voltage range on a gate high voltage provided to the column drive circuit, and forms a plurality of fourth pulses oscillating within the second voltage range on a gate low voltage provided to the column drive circuit.

8. The touch display panel as described in claim 7, characterized in that, During the first sensing period and the second sensing period, the control circuit controls the row drive circuit to form a plurality of fifth pulses on the source electrode lines that oscillate between the system high voltage and the system low voltage.

9. A sensing method for a touch display panel, characterized in that, include: The touch display panel has entered standby gesture wake-up mode. During a first sensing period, a plurality of common electrode lines of the touch display panel are driven by a plurality of first pulses oscillating within a first voltage range via a common electrode driving / sensing circuit of the touch display panel; as well as In a second sensing period different from the first sensing period, the common electrode lines are driven via the common electrode drive / sensing circuit with a plurality of second pulses oscillating between a second voltage range different from the first voltage range, wherein a common voltage is located between the first voltage range and the second voltage range; wherein During multiple electrode grounding periods, the common electrode lines are driven by a system low voltage or the common voltage via the common electrode drive / sensing circuit, wherein the electrode grounding periods are individually located between the first sensing period, the second sensing period, a third sensing period and a fourth sensing period.

10. The sensing method as described in claim 9, characterized in that, Also includes: During the third sensing period, the common electrode lines are driven by the first pulses via the common electrode drive / sensing circuit; as well as During the fourth sensing period, the common electrode drive / sensing circuit drives the common electrode lines with the second pulses.

11. The sensing method as described in claim 10, characterized in that, The second sensing period is located between the first sensing period and the third sensing period, and the third sensing period is located between the second sensing period and the fourth sensing period.

12. The sensing method as described in claim 10, characterized in that, The third sensing period is located between the first sensing period and the second sensing period, and the second sensing period is located between the third sensing period and the fourth sensing period.

13. The sensing method as described in claim 9, characterized in that, The first voltage range is located between a system high voltage and the common voltage, and the second voltage range is located between the common voltage and a system low voltage.

14. The sensing method as described in claim 13, characterized in that, The first voltage range is equal to the second voltage range.

15. The sensing method as described in claim 13, characterized in that, Also includes: During the first sensing period and the second sensing period, a control circuit of the touch display panel forms a plurality of third pulses oscillating between the first voltage range on a gate high voltage provided to a column driving circuit of the touch display panel, and forms a plurality of fourth pulses oscillating between the second voltage range on a gate low voltage provided to the column driving circuit.

16. The sensing method as described in claim 15, characterized in that, Also includes: During the first sensing period and the second sensing period, multiple fifth pulses are formed on multiple source electrode lines of the touch display panel via a row driving circuit of the touch display panel, oscillating between the system high voltage and the system low voltage.

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