In-cell touch display device and operating method thereof

Abstract

The present disclosure provides an in-cell touch display device, which includes a display panel, a touch electrode and a cover plate. The touch electrode is disposed on the display panel and includes a driving electrode and a sensing electrode. The cover plate is disposed on the touch electrode. The driving electrode is away from the display panel relative to the sensing electrode in a top view direction of the in-cell touch display device. The present disclosure also provides an operation method of the in-cell touch display device. The in-cell touch display device provided by the present disclosure can reduce noise interference from the display panel and has relatively flexible operability and / or relatively low cost.

Description

Technical Field

[0001] This disclosure relates to an electronic device and a method of manufacturing the same, and more particularly to an embedded touch display device and a method of operating the same. Background Technology

[0002] Fingers and passive styluses are commonly used as the medium for operating embedded touch displays; however, both have limitations in their application scenarios. For example, fingers and passive pens are relatively poor at producing smooth writing and varying line thickness, making them relatively unsuitable for writing or drawing. Therefore, technology has been developed that utilizes active styluses in conjunction with embedded touch displays.

[0003] However, during the display phase, the display drive signal transmitted to the display panel of the embedded touch display device can easily interfere with the signal transmission between the active stylus and the embedded touch display device. This can lead to false alarms due to noise interference, thereby increasing the load of touch operation and / or reducing the accuracy of touch sensing.

[0004] Furthermore, when using the Microsoft Pen Protocol with an embedded touch display device, a Bluetooth transmitter is required, and when using an Electromagnetic Resonance stylus with an embedded touch display device, a grid-like sensor plate needs to be embedded. This imposes design limitations and relatively high costs on embedded touch display devices. Summary of the Invention

[0005] This disclosure provides an embedded touch display device that reduces noise interference from the display panel and has relatively flexible operability and / or relatively low cost.

[0006] The disclosed embedded touch display device includes a display panel, touch electrodes, and a cover plate. The touch electrodes are disposed on the display panel and include driving electrodes and sensing electrodes. The cover plate is disposed on the touch electrodes. The driving electrodes are located away from the display panel relative to the sensing electrodes in a top-view orientation of the embedded touch display device.

[0007] In one embodiment disclosed herein, the driving electrode is close to the cover plate relative to the sensing electrode in the top view of the embedded touch display device.

[0008] In one embodiment disclosed herein, the display panel is a liquid crystal display panel.

[0009] In one embodiment disclosed herein, the embedded touch display device further includes a first adhesive layer, a second adhesive layer, and a third adhesive layer. The first adhesive layer is disposed between the display panel and the sensing electrode. The second adhesive layer is disposed between the sensing electrode and the driving electrode. The third adhesive layer is disposed between the driving electrode and the cover plate.

[0010] In one embodiment disclosed herein, the embedded touch display device is operated by an active stylus.

[0011] In one embodiment disclosed herein, the active stylus includes a Microsoft Pen Protocol or an electromagnetic resonance stylus.

[0012] This disclosure provides an operating method for an embedded touch display device that can reduce noise interference from the display panel and has relatively flexible operation and / or relatively low cost.

[0013] The operation method of the embedded touch display device disclosed herein includes the following steps. During the display phase, a data voltage is applied to the display panel in the embedded touch display device, wherein when driving the first row of pixels of the display panel, the data voltage is reduced from a first potential to a second potential.

[0014] In one embodiment disclosed herein, the first potential is 10V and the second potential is 9V.

[0015] In one embodiment of this disclosure, the display panel includes a plurality of pixel units, and one of the plurality of pixel units includes 8x8 pixels.

[0016] In one embodiment of this disclosure, the first row of pixels includes pixels that are in a dark state.

[0017] Based on the above, in the embedded touch display device disclosed herein, by adjusting the relative position between the driving electrode and the sensing electrode, the technical problem of false signal alarms between the active stylus and the embedded touch display device due to noise interference can be reduced. Furthermore, in the operating method of the embedded touch display device disclosed herein, by adjusting the data voltage, the 5kHz octave noise and 25kHz fixed-frequency noise generated by the display panel can be reduced or eliminated. Since this operating method can suppress the noise generated by the display panel, it can also reduce the technical problem of false signal alarms between the active stylus and the embedded touch display device due to noise interference.

[0018] Furthermore, the embedded touch display device disclosed herein does not require a Bluetooth transmitter and does not require an embedded grid-like sensor panel. Therefore, the embedded touch display device disclosed herein offers relatively flexible operability and / or relatively low cost. Attached Figure Description

[0019] Figure 1This is a partial cross-sectional schematic diagram of an embedded touch display device according to an embodiment of the present disclosure;

[0020] Figure 2A This is a partial top view of a display panel according to an embodiment of the present disclosure;

[0021] Figure 2B This invention discloses a voltage waveform diagram of the pixel voltage of a display panel during the display stage according to an embodiment;

[0022] Figure 2C The diagram shows the voltage waveform of the noise signal generated by a display panel according to an embodiment of this disclosure and a prior art display panel. Detailed Implementation

[0023] The following examples, in conjunction with the accompanying drawings, are provided to describe this disclosure in detail, but the examples provided are not intended to limit the scope of this disclosure. Furthermore, the accompanying drawings are for illustrative purposes only, and certain elements in the drawings are not drawn to scale. For ease of understanding, the same elements will be identified using the same symbols in the following description.

[0024] Figure 1 This is a partial cross-sectional schematic diagram of an embedded touch display device according to an embodiment of the present invention.

[0025] Please refer to Figure 1 The embedded touch display device 10 in this embodiment includes a display panel 100, touch electrodes 200, and a cover plate 300.

[0026] The display panel 100 may include, for example, a liquid crystal display panel, but this disclosure is not limited thereto. In some embodiments, the display panel 100 includes a substrate (not shown), an element layer (not shown), and a display medium (not shown). The substrate of the display panel 100 may include, for example, a flexible substrate or a non-flexible substrate, wherein the material of the substrate may include, for example, glass, plastic, or a combination thereof. For example, the substrate of the display panel 100 may include quartz, sapphire, polymethyl methacrylate (PMMA), polycarbonate (PC), polyimide (PI), polyethylene terephthalate (PET), or other suitable materials or combinations thereof, and this disclosure is not limited thereto. The element layer of the display panel 100 is disposed on the substrate, for example, and may include, for example, a circuit structure to drive the display medium. For example, the element layer of the display panel 100 may include multiple scan lines, multiple data lines, an insulating layer, capacitors, multiple transistors, and / or multiple electrodes, etc., but this disclosure is not limited thereto. In some embodiments, the element layer of the display panel 100 may include multiple lines but not transistors, and the display medium of the display panel 100 may, for example, be disposed on the element layer. In this embodiment, the display medium of the display panel 100 includes liquid crystal molecules, which are liquid crystal molecules that can be rotated or switched by a vertical electric field or liquid crystal molecules that can be rotated or switched by a transverse electric field; this disclosure is not limited thereto.

[0027] The driving electrode 200 is disposed, for example, on the display panel 100. In this embodiment, the touch electrode 200 includes a driving electrode Tx and a sensing electrode Rx, and is electrically connected to a touch circuit (not shown). Specifically, the touch electrode 200 may include a driving electrode Tx configured to apply a driving signal and a sensing electrode Rx configured to receive a sensing signal. In this embodiment, the embedded touch display device 10 is operated using an active stylus (not shown, but may be, for example, a Microsoft Pen Protocol or Electromagnetic Resonance stylus). When the active stylus contacts the cover plate 300 of the embedded touch display device 10, the touch circuit can send a signal to the active stylus through the driving electrode Tx, and can receive the signal sent by the active stylus. In some embodiments, the signal sent by the touch circuit to the active stylus through the driving electrode Tx includes information of the display panel 100, and the signal received by the touch circuit from the active stylus includes information of the active stylus, but this disclosure is not limited thereto. The sensing electrode Rx senses the signal transmitted from the touch circuit to the driving electrode Tx and generates capacitance (mutual capacitance) together with the driving electrode Tx. In some embodiments, the driving electrode Tx and the sensing electrode Rx are respectively disposed on different planes. Specifically, an insulating layer (not shown) may be disposed between the driving electrode Tx and the sensing electrode Rx to achieve mutual capacitance between the driving electrode Tx and the sensing electrode Rx.

[0028] A cover plate 300 is disposed on the touch electrode 200, for example, to protect the touch electrode 200 and the display panel 100. For instance, the cover plate 300 may include dustproof, scratch-resistant, and water vapor intrusion-resistant properties to reduce the impact of the external environment on the touch electrode 200 and the display panel 100, and the cover plate 300 may be light-transmitting. In some embodiments, the material of the cover plate 300 may include glass, wherein the type or composition of the glass is not particularly limited, and it may be, for example, aluminosilicate glass, lithium aluminosilicate glass, soda-lime silicate glass, aluminosilicate glass, quartz glass, or other light-transmitting glass, but this disclosure is not limited thereto. In other embodiments, the material of the cover plate 300 may include organic materials, such as resin, acrylic, or other suitable organic materials.

[0029] In some embodiments, the embedded touch display device 10 may further include an adhesive layer OCA to bond adjacent components to each other. In this embodiment, the adhesive layer OCA includes adhesive layers OCA1, OCA2, and OCA3, wherein adhesive layer OCA1 is disposed between the display panel 100 and the sensing electrode Rx, adhesive layer OCA2 is disposed between the sensing electrode Rx and the driving electrode Tx, and adhesive layer OCA3 is disposed between the driving electrode Tx and the cover plate 300. In some embodiments, the adhesive layer OCA may include an optically clear adhesive (OCA). For example, the material of the adhesive layer OCA may include acrylic resin, silicone resin, epoxy resin, or other suitable materials or combinations thereof, but this disclosure is not limited thereto.

[0030] In this embodiment, the driving electrode Tx is positioned close to the cover plate 300 relative to the sensing electrode Rx in the top-view direction Z of the embedded touch display device 10, which increases the signal strength transmitted between the active stylus and the embedded touch display device 10. Additionally, in this embodiment, the driving electrode Tx is positioned away from the display panel 100 relative to the sensing electrode Rx in the top-view direction Z of the embedded touch display device 10, which reduces interference from the data voltage (pixel voltage) of the data lines (not shown) transmitted to the display panel 100 with the signal transmitted between the active stylus and the embedded touch display device 10. Through this design, the embedded touch display device 10 of this embodiment reduces the technical problem of false alarms caused by noise interference.

[0031] Figure 2A This is a partial top view of a display panel according to an embodiment of the present disclosure. Figure 2B This disclosure presents a voltage waveform diagram of the pixel voltage of a display panel during the display phase, according to an embodiment of the present invention. Figure 2C The diagram shows the voltage waveform of the noise signal generated by a display panel according to an embodiment of this disclosure and a prior art display panel.

[0032] Please refer to Figure 2A The display panel 100 in this embodiment may include a plurality of pixels PX, which are arranged in an array in the X and Y directions. In this embodiment, 8x8 pixels PX constitute a pixel unit U. In some embodiments, the display panel 100 may include a gate driving circuit (not shown), wherein the gate driving circuit may include 8 shift registers (not shown) and 8 clock signal lines (not shown), and each shift register is electrically connected to a corresponding clock signal line so that after receiving a clock signal from the corresponding clock signal line, it outputs a corresponding gate signal through the clock signal and delivers it to the corresponding pixel PX in a pixel unit U. In other words, the shift registers in this embodiment are in 8-level cycles, but this disclosure is not limited thereto.

[0033] It is worth noting that, Figure 2A The illustration shows that pixel PX can be pixel PX1, which presents a dark state, and pixel PX2, which presents a bright state, but this disclosure is not limited thereto. For example, the first row of pixels PX in pixel unit U includes pixel PX1, which presents a dark state.

[0034] In this embodiment, the display panel 100 may further include a source drive circuit (not shown). Please refer to... Figure 2B During the display phase, the display panel 100 in the embedded touch display device 10 can apply a data voltage Vdata to the data line (not shown) via a source drive circuit. In this embodiment, when driving the first row of pixels PX in the pixel unit U, the data voltage Vdata is lowered from a first potential to a second potential, and when driving the second to eighth rows of pixels PX in the pixel unit U, the data voltage Vdata is maintained at the first potential. In this embodiment, the first potential is 10V and the second potential is 9V, but this disclosure is not limited thereto. By changing the data voltage Vdata, the 5kHz octave noise and the 25kHz fixed-frequency noise generated by the display panel 100 can be reduced or eliminated. For details, please refer to... Figure 2C In this embodiment, through the operation method of the embedded touch display device 10 described above, the noise voltage Vnoise generated by the display panel 100 will be reduced compared to the noise voltage Vnoise' generated by the display panel in the prior art.

[0035] Based on this, this embodiment can suppress noise generated by the display panel 100 by adjusting the data voltage Vdata. By suppressing the noise generated by the display panel 100, interference with the signal transmitted between the active stylus and the embedded touch display device 10 can also be reduced. Through this design, the embedded touch display device 10 of this embodiment can also reduce the technical problem of false alarms caused by noise interference.

[0036] In summary, in the embedded touch display device provided in one embodiment of this disclosure, by adjusting the relative position between the driving electrode and the sensing electrode, the strength of the signal transmitted between the active stylus and the embedded touch display device can be increased, and the interference of data voltage on the data line transmitted to the display panel on the signal transmitted between the active stylus and the embedded touch display device can be reduced. Based on this, the embedded touch display device provided in one embodiment of this disclosure can reduce the technical problem of false signal alarms between the active stylus and the embedded touch display device.

[0037] In the operation method of the embedded touch display device provided in one embodiment of this disclosure, by adjusting the data voltage, the 5kHz octave noise and 25kHz fixed-frequency noise generated by the display panel can be reduced or eliminated, thereby suppressing the noise generated by the display panel. Based on this, the operation method of the embedded touch display device provided in one embodiment of this disclosure can reduce the technical problem of false signal alarms between the active stylus and the embedded touch display device.

[0038] Furthermore, the embedded touch display device disclosed herein does not require a Bluetooth transmitter and does not require an embedded grid-like sensor panel. Therefore, the embedded touch display device disclosed herein offers relatively flexible operability and / or relatively low cost.

[0039] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An embedded touch display device, characterized in that, include: Display panel; Touch electrodes are disposed on the display panel and include driving electrodes and sensing electrodes; as well as A cover plate is disposed on the touch electrode. The driving electrode is located away from the display panel relative to the sensing electrode in the top view of the embedded touch display device.

2. The embedded touch display device according to claim 1, further comprising: A first adhesive layer is disposed between the display panel and the sensing electrode; A second adhesive layer is disposed between the sensing electrode and the driving electrode; as well as A third adhesive layer is disposed between the driving electrode and the cover plate. The driving electrode is located close to the cover plate relative to the sensing electrode in the top view of the embedded touch display device. The display panel mentioned is a liquid crystal display panel.

3. The embedded touch display device according to claim 1, which is operated by an active stylus.

4. The embedded touch display device according to claim 3, wherein the active stylus includes a Microsoft Pen Protocol stylus or an electromagnetic resonance stylus.

5. An embedded touch display device, characterized in that, The device includes a display panel, wherein during the display phase, a data voltage is applied to the display panel, and when driving the first row of pixels of the display panel, the data voltage is reduced from a first potential to a second potential.

6. An operation method for an embedded touch display device, characterized in that, include: During the display phase, a data voltage is applied to the display panel in the embedded touch display device. When driving the first row of pixels on the display panel, the data voltage is reduced from the first potential to the second potential.

7. The method of operating the embedded touch display device according to claim 6, wherein the first potential is 10V and the second potential is 9V.

8. The method of operating the embedded touch display device according to claim 6, wherein the display panel includes a plurality of pixel units, and one of the plurality of pixel units includes 8x8 pixels.

9. The method of operating the embedded touch display device according to claim 6, wherein the first row of pixels includes pixels that are in a dark state.

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