Touch display device and heating operation method thereof

Abstract

The invention discloses a touch display device and a heating operation method thereof. The touch display device comprises a touch display panel, a driving induction circuit and a panel heating circuit. The touch display panel has a plurality of pixels, a plurality of touch electrodes, and a plurality of heater electrodes. The driving sensing circuit provides a plurality of pixel voltages to the pixels based on the received display data, and provides a touch driving signal to the touch electrodes. The panel heating circuit provides a heater signal to the heater electrode. During image display, the driving sensing circuit provides the pixel voltages to the pixels, and the voltage level of the heater signal is higher than the reference voltage. In the touch sensing period, the driving sensing circuit provides a touch driving signal to the touch electrode, and the voltage level of the heater signal is lower than or equal to the reference voltage.

Description

Technical Field

[0001] The present invention relates to a display device, and more particularly to a touch display device with a heater and a heating operation method thereof. Background Art

[0002] At present, the most common display technology should be liquid crystal display (LCD), in which LCD is an electronic device with flat display technology. Liquid crystal can flow like liquid, but also has the phase state of solid crystal optical properties. However, in low temperature environment, the rotation of liquid crystal becomes slow, causing the picture of LCD to be blurred. Therefore, in the structure of LCD, the bottom layer of the display panel forms a resistive heater electrode to achieve the function of heating the display panel, so that the display panel can overcome the problem of low temperature.

[0003] However, in the structure of the display panel forming the resistive heater electrode, the heater electrode overlaps with the touch electrode (or common electrode). Therefore, when the heater electrode is heated by applying a voltage, the charge of the heater electrode is coupled to the touch electrode, causing the touch sensing circuit to be unable to sense the charge difference of the finger touch, that is, the touch sensing circuit cannot detect the finger touch. Summary of the invention

[0004] The present invention provides a touch display device and a heating operation method thereof, which can reduce the influence of the operation of a heater electrode on a touch electrode.

[0005] The touch display device of the present invention includes a touch display panel, a driving sensing circuit, and a panel heating circuit. The touch display panel has a plurality of pixels arranged in an array, and has a plurality of touch electrodes and a plurality of heater electrodes. The driving sensing circuit is coupled to the touch display panel to provide a plurality of pixel voltages to the pixels based on the received display data, and to provide touch drive signals to the touch electrodes. The panel heating circuit is coupled to the driving sensing circuit and the heater electrodes to be controlled by the driving sensing circuit to provide heater signals to the heater electrodes. During the picture display period, the driving sensing circuit provides the pixel voltages to the pixels, and the voltage level of the heater signal provided by the panel heating circuit is higher than the reference voltage. During the touch sensing period, the driving sensing circuit provides the touch drive signal to the touch electrodes, and the voltage level of the heater signal provided by the panel heating circuit is lower than or equal to the reference voltage.

[0006] The heating operation method of the touch display device of the present invention comprises a touch display panel having a plurality of pixels, a plurality of touch electrodes and a plurality of heater electrodes, and the heating operation method comprises the following steps. The driving sensing circuit of the touch display device determines whether the touch display device is in a picture display period or a touch sensing period. During the picture display period, a plurality of pixel voltages are provided to these pixels via the driving sensing circuit, and a heater signal having a voltage level higher than a reference voltage is provided via a panel heating circuit of the touch display device. During the touch sensing period, a touch driving signal is provided to these touch electrodes via the driving sensing circuit, and the panel heating circuit provides a heater signal having a voltage level lower than or equal to the reference voltage.

[0007] Based on the above, the touch display device and heating operation method thereof of the embodiments of the present invention can reduce the voltage difference between the touch drive signal of the reference voltage and the heater signal by making the voltage level of the heater signal lower than or equal to the reference voltage during touch sensing, thereby reducing the influence of the operation of the heater electrode on the touch electrode.

[0008] In order to make the above features and advantages of the present invention more obvious and easy to understand, embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 FIG. 4 is a system diagram of a touch display device according to an embodiment of the present invention.

[0010] Figure 2 FIG. 4 is a system diagram of a panel heating circuit of a touch display device according to an embodiment of the present invention.

[0011] Figure 3 FIG. 1 is a schematic diagram of a first operation timing sequence of a touch display device according to an embodiment of the present invention.

[0012] Figure 4 FIG. 4 is a schematic diagram of a second operation timing sequence of a touch display device according to an embodiment of the present invention.

[0013] Figure 5 FIG. 4 is a flow chart of a heating operation method of a touch display device according to an embodiment of the present invention.

[0014] Description of reference numerals:

[0015] 100: Touch display device

[0016] 110: Driving sensing circuit

[0017] 120: Touch display panel

[0018] 130: Panel heating circuit

[0019] 131: Power circuit

[0020] 132: First switch circuit

[0021] 133: Second switch circuit

[0022] DATAdp: Display data

[0023] Display: Screen display period

[0024] EHano: Anode Heater Electrode

[0025] EHcath1, EHcath2: cathode heater electrode

[0026] GND: Ground voltage

[0027] HEon / off: Heating enable cutoff signal

[0028] LEht: Heater electrode

[0029] LEtp: Touch Electrode

[0030] PX: Pixel

[0031] SHEano: First heater control signal

[0032] SHEcath: Second heater control signal

[0033] SSheater: Heater electrode switch signal

[0034] SStouch: Touch electrode switch signal

[0035] SWh: Heater switch

[0036] SWt: Touch switch

[0037] TP: Touch sensing period

[0038] Vcom: common voltage

[0039] VDChe: Heater DC level

[0040] Vhearter: Heater signal

[0041] Vpixel: pixel voltage

[0042] Vtouch: touch drive signal

[0043] S110, S120, S130: Steps DETAILED DESCRIPTION

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

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

[0046] The terms used herein are only for the purpose of describing specific embodiments and are not restrictive. As used herein, unless the content clearly indicates, the singular forms "one", "an" and "the" are intended to include 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 related listed items. It should also be understood that when used in this specification, the terms "include" and / or "include" specify the presence and / or parts of the features, regions, entireties, steps, operations, elements, but do not exclude the presence or addition of one or more other features, regions, entireties, steps, operations, elements, parts and / or their combinations.

[0047] Figure 1 is a system diagram of a touch display device according to an embodiment of the present invention. Figure 1 In this embodiment, the touch display device 100 at least includes a driving sensing circuit 110, a touch display panel 120, and a panel heating circuit 130. The touch display panel 120 has a plurality of pixels PX arranged in an array, and has a plurality of touch electrodes LEtp extending in a vertical direction and arranged horizontally, and a plurality of heater electrodes LEht extending in a horizontal direction and arranged vertically.

[0048] The panel heating circuit 130 is coupled to the driving sensing circuit 110 and the heater electrode LEht, and is controlled by the driving sensing circuit 110 (for example, based on the first heater control signal SHEano and / or the second heater control signal SHEcath) to provide a heater signal Vhearter to the heater electrode LEht. The driving sensing circuit 110 is coupled to the touch display panel 120, and is used to provide a plurality of pixel voltages Vpixel to the pixel PX based on the received display data DATAdp, and to provide a touch driving signal Vtouch to the touch electrode LEtp, wherein the display data DATAdp received by the driving sensing circuit 110 determines whether the touch display device 100 is in a picture display period or a touch sensing period.

[0049] During the picture display period, the driving sensing circuit 110 provides the pixel voltage Vpixel to the pixel PX, and the voltage level of the heater signal Vhearter provided by the panel heating circuit 130 is higher than the reference voltage (e.g., the ground voltage) to heat the touch display device 100. During the touch sensing period, the driving sensing circuit 110 provides the touch driving signal Vtouch to the touch electrode LEtp, and the voltage level of the heater signal Vhearter provided by the panel heating circuit 130 is lower than or equal to the reference voltage (e.g., the ground voltage).

[0050] Based on the above, by setting the voltage level of the heater signal Vhearter to be lower than or equal to a reference voltage (e.g., a ground voltage) during touch sensing, the voltage difference between the touch driving signal Vtouch which is lower than the reference voltage and the heater signal Vhearter can be lowered to reduce the influence of the operation of the heater electrode LEht on the touch electrode LEtp.

[0051] In the embodiment of the present invention, the touch display device 100 further includes a plurality of touch switches SWt, an anode heater electrode EHano, a plurality of heater switches SWh, and a plurality of cathode heater electrodes (herein, two cathode heater electrodes EHcath1 and EHcath2 are taken as an example). Each of the touch switches SWt is coupled between the driving sensing circuit 110 and one of the touch electrodes LEtp, and is controlled by the touch electrode switch signal SStouch received by the driving sensing circuit 110.

[0052] The anode heater electrode EHano is coupled to the panel heating circuit 130 to receive the heater signal Vhearter. The heater switch SWh is coupled between the anode heater electrode EHano and the heater electrode LEht, and is controlled by the heater electrode switch signal SSheater provided by the driving sensing circuit 110. The cathode heater electrodes EHcath1 and EHcath2 are respectively coupled between a portion of the heater electrode LEht and the panel heating circuit 130, that is, a portion of the heater electrode LEht is coupled to the cathode heater electrode EHcath1, and another portion of the heater electrode LEht is coupled to the cathode heater electrode EHcath2.

[0053] In the embodiment of the present invention, the reference voltage may be a ground voltage. When the heater signal Vhearter is lower than or equal to the reference voltage, the heater electrode LEht may be regarded as being turned off (ie, inactive). This depends on the circuit design and is not limited to the embodiment of the present invention.

[0054] In the embodiment of the present invention, the touch electrode LEtp can be shared with the common electrode. In this case, the driving sensing circuit 110 can provide the common voltage Vcom to the touch electrode LEtp during the image display period. This depends on the circuit design and is not limited to the embodiment of the present invention.

[0055] In an embodiment of the present invention, the heater electrode LEht is set to be driven in a partitioned manner, but in an embodiment of the present invention, the heater electrode LEht can be set to be driven together, so the cathode heater electrode (such as EHcath1, EHcath2) can be one, which depends on the circuit design and is not limited to the embodiment of the present invention.

[0056] In the embodiment of the present invention, the heater switch SWh can be turned on when the heater electrode LEht is enabled, and turned off when it is disabled. Similarly, the touch switch SWt can be turned on when the touch electrode LEtp is enabled, and turned off when it is disabled.

[0057] In the embodiment of the present invention, the driving sensing circuit 110 may at least include a timing controller, a data driver, and a touch sensing circuit, but the embodiment of the present invention is not limited thereto.

[0058] Figure 2 This is a system diagram of a panel heating circuit of a touch display device according to an embodiment of the present invention. Figure 1 and Figure 2 In this embodiment, the panel heating circuit 130 at least includes a power circuit 131, a first switch circuit 132, and a second switch circuit 133. The power circuit 131 is used to provide a heater DC level VDChe higher than a reference voltage based on the heating enable off signal HEon / off.

[0059] The first switch circuit 132 is coupled between the anode heater electrode EHano and the power circuit 131, and receives one of the reference voltage and the touch driving signal Vtouch and the heater DC level VDChe. Based on the first heater control signal SHEano indicating that the touch display device 100 is in one of the picture display period and the touch sensing period, the first switch circuit 132 provides the heater DC level VDChe as the heater signal Vhearter to the anode heater electrode EHano during the picture display period, and provides one of the ground voltage GND and the touch driving signal Vtouch as the heater signal Vhearter to the anode heater electrode EHano during the touch sensing period.

[0060] The second switch circuit 133 is coupled between the cathode heater electrodes EHcath1, EHcath2 and the power circuit 131, and receives a second heater control signal SHEcath indicating a partition operation to couple one of the cathode heater electrodes EHcath1 and EHcath2 to the power circuit 131 based on the second heater control signal SHEcath to form a power loop.

[0061] In the embodiment of the present invention, the heating enable off signal HEon / off may be a temperature signal provided by a temperature sensor or a temperature-based control signal from the driving sensing circuit 110 , which depends on the circuit design and is not limited to the embodiment of the present invention.

[0062] In the present invention, the heater electrode LEht is set to be driven in a partitioned manner, so a second switching circuit 133 is required. However, in an embodiment of the present invention, the heater electrodes LEht can be set to be driven together, so the second switching circuit 133 can be omitted and the power supply circuit 131 can be directly coupled to the cathode heater electrodes (such as EHcath1, EHcath2).

[0063] Figure 3 FIG. 1 is a schematic diagram of a first operation sequence of a touch display device according to an embodiment of the present invention. Figure 1 and Figure 3 In this embodiment, when the display data DATAdp contains pixel data, the driving sensing circuit 110 can determine that the touch display device 100 is in the picture display period Display. At this time, the touch electrode LEtp can act as a common electrode, so the touch driving signal Vtouch can be a DC voltage (such as the ground voltage GND), and the heater signal Vhearter is set to a heater DC level VDChe higher than the ground voltage GND to enable the heater electrode LEht.

[0064] When there is no pixel data in the display data DATAdp, the driving sensing circuit 110 can determine that the touch display device 100 is in the touch sensing period TP. At this time, the touch electrode LEtp performs sensing, so the touch driving signal Vtouch will be a pulse lower than the ground voltage GND, and the heater signal Vhearter will be set to be equal to the ground voltage GND to disable the heater electrode LEht.

[0065] Figure 4 FIG. 1 is a schematic diagram of a second operation sequence of a touch display device according to an embodiment of the present invention. Figure 1 and Figure 3 In this embodiment, when the display data DATAdp contains pixel data, the driving sensing circuit 110 can determine that the touch display device 100 is in the picture display period Display. At this time, the touch electrode LEtp can act as a common electrode, so the touch driving signal Vtouch can be a DC voltage (such as the ground voltage GND), and the heater signal Vhearter is set to a heater DC level VDChe higher than the ground voltage GND to enable the heater electrode LEht.

[0066] When there is no pixel data in the display data DATAdp, the driving sensing circuit 110 can determine that the touch display device 100 is in the touch sensing period TP. At this time, the touch electrode LEtp performs sensing, so the touch driving signal Vtouch will be a pulse lower than the ground voltage GND, and the heater signal Vhearter will be set to the touch driving signal Vtouch lower than the ground voltage GND, that is, the voltage waveform of the heater signal Vhearter is the same as the touch driving signal Vtouch, so as to disable the heater electrode LEht.

[0067] Therefore, the heater signal Vhearter and the touch driving signal Vtouch are driven together, so that the capacitive sensing signal of the touch electrode LEtp has no saturation problem. In addition, the heater signal Vhearter and the touch driving signal Vtouch are driven together, so that the signal-to-noise ratio (SNR) evaluation of the touch electrode LEtp can be maintained at the same level.

[0068] Figure 5 This is a flow chart of a heating operation method of a touch display device according to an embodiment of the present invention. Figure 5In the present embodiment, the touch display device includes a touch display panel having a plurality of pixels, a plurality of touch electrodes and a plurality of heater electrodes, and the heating operation method includes the following steps. In step S110, the driving sensing circuit of the touch display device will determine whether the touch display device is in a picture display period or a touch sensing period. During the picture display period, step S120 will be executed. In step S120, a plurality of pixel voltages are provided to these pixels via the driving sensing circuit, and a heater signal having a voltage level higher than a reference voltage is provided via the panel heating circuit of the touch display device. During the touch sensing period, step S130 will be executed. In executing step S130, a touch driving signal is provided to these touch electrodes via the driving sensing circuit, and the panel heating circuit provides a heater signal having a voltage level lower than or equal to the reference voltage. Among them, the order of steps S110, S120 and S130 is for illustration, and the embodiments of the present invention are not limited thereto. And the details of steps S110, S120 and S130 can be referred to. Figures 1 to 4 The embodiments are shown in the embodiment, which will not be repeated here.

[0069] The touch display device and heating operation method thereof of the embodiment of the present invention can reduce the voltage difference between the touch driving signal of the reference voltage and the heater signal by making the voltage level of the heater signal lower than or equal to the reference voltage during touch sensing, thereby reducing the influence of the operation of the heater electrode on the touch electrode.

[0070] Although the present invention has been disclosed as above by way of embodiments, it is not intended to limit the present invention. Any person skilled in the art may make some changes and modifications without departing from the concept and scope of the present invention. Therefore, the protection scope of the present invention shall be determined by the claims.

Claims

1. A touch display device, comprising: A touch display panel having a plurality of pixels arranged in an array, a plurality of touch electrodes and a plurality of heater electrodes; A driving sensing circuit coupled to the touch display panel for providing a plurality of pixel voltages to the pixels based on received display data and providing a touch driving signal to the touch electrodes; as well as a panel heating circuit coupled to the driving sensing circuit and the heater electrodes to be controlled by the driving sensing circuit to provide a heater signal to the heater electrodes; During a frame display period, the driving sensing circuit provides the pixel voltages to the pixels, and a voltage level of the heater signal provided by the panel heating circuit is higher than a reference voltage. During a touch sensing period, the driving sensing circuit provides the touch driving signal to the touch electrodes, and the voltage level of the heater signal provided by the panel heating circuit is lower than or equal to the reference voltage. 2 . The touch display device as claimed in claim 1 , wherein during the touch sensing period, the voltage level is lower than the reference voltage. 3 . The touch display device as claimed in claim 2 , wherein during the touch sensing period, a voltage waveform of the heater signal is the same as that of the touch driving signal. 4 . The touch display device as claimed in claim 1 , wherein the reference voltage is a ground voltage.

5. The touch display device according to claim 1, further comprising: an anode heater electrode coupled to the panel heating circuit to receive the heater signal; as well as A plurality of heater switches are coupled between the anode heater electrode and the heater electrodes.

6. The touch display device as claimed in claim 5, wherein the panel heating circuit comprises: a power circuit for providing a heater DC level higher than the reference voltage based on a heating enable cutoff signal; A first switching circuit is coupled between the anode heater electrode and the power supply circuit, and receives the reference voltage, one of the touch drive signal, and the heater DC level, wherein the first switching circuit provides the heater DC level as the heater signal to the anode heater electrode during the image display period based on a first heater control signal indicating that the touch display device is in one of the image display period and the touch sensing period, and provides the reference voltage and one of the touch drive signal as the heater signal to the anode heater electrode during the touch sensing period. 7 . The touch display device as claimed in claim 5 , further comprising a plurality of cathode heater electrodes, each of which is coupled between a portion of the heater electrodes and the panel heating circuit.

8. The touch display device as claimed in claim 7, wherein the panel heating circuit further comprises: A second switch circuit is coupled between the cathode heater electrodes and the power circuit and receives a second heater control signal indicating a partition operation to couple one of the cathode heater electrodes to the power circuit based on the second heater control signal.

9. A heating operation method of a touch display device, the touch display device comprising a touch display panel having a plurality of pixels, a plurality of touch electrodes and a plurality of heater electrodes, the heating operation method comprising: Determining, via a driving sensing circuit of the touch display device, whether the touch display device is in the image display period or the touch sensing period; During the display of the image, a plurality of pixel voltages are provided to the pixels via the driving sensing circuit, and a heater signal having a voltage level higher than a reference voltage is provided via a panel heating circuit of the touch display device; as well as During the touch sensing period, a touch driving signal is provided to the touch electrodes via the driving sensing circuit, and the panel heating circuit provides the heater signal whose voltage level is lower than or equal to the reference voltage. 10 . The heating operation method as claimed in claim 9 , wherein during the touch sensing period, the voltage level is lower than the reference voltage. 11 . The heating operation method as claimed in claim 10 , wherein during the touch sensing period, a voltage waveform of the heater signal is the same as that of the touch driving signal. 12 . The heating operation method as claimed in claim 9 , wherein the reference voltage is a ground voltage.

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