TWI643116B - Touch display device and method using display peripheral electrode and display electrode - Google Patents

Abstract

The present invention relates to a touch display device and method using a display peripheral electrode and a display electrode, comprising a touch display panel, wherein the touch display panel sequentially sets a substrate, a pixel electrode layer, a luminescent material layer and a cathode electrode layer from bottom to top. And the cover plate, the pixel electrode layer and the cathode electrode layer constitute a display area electrode, and the peripheral touch receiving electrode (RX) is disposed outside the display area electrode; when the display behavior operation is performed, the display control signal is transmitted through the touch display control unit Between the pixel electrode layer and the cathode electrode layer, the luminescent material layer is driven to emit light for image display; when the touch behavior operation is performed, the touch control signal is transmitted to the pixel electrode layer and the cathode electrode through the touch display control unit. The layer has a pixel electrode layer and a cathode electrode layer as a touch transmitting electrode (TX) and emits a touch signal, and the peripheral touch receiving electrode (RX) receives the touch signal for touch detection.

Description

Touch display device and method using display peripheral electrode and display electrode

The invention relates to a touch panel, in particular to a touch detection device and method using a peripheral electrode and a display electrode of the display.

Referring to FIG. 1 , a conventional OLED touch panel uses an organic layer as an insulating layer (PI) between a cathode and an anode, and a parasitic capacitance C _f is generated from a cathode and an anode. It can be known that the capacitance value is proportional to the contact area A of the OLED, and inversely proportional to the distance d between the cathode and the anode. Since the thickness of the OLED layer is only 30 nm, a large parasitic capacitance _Cf is formed between the cathode and the anode. _The capacitance value is about nF. Therefore, when the cathode and the anode are used as the sensing electrodes of the in-cell TP, the parasitic capacitance C _{f is} too large, and the sensing capacitance (about less than 10 pF) generated by the finger is regarded as noise. The size of the capacitor cannot be sensed.

In general, the sensing method of In-Cell TP is self-capacitance and mutual-capacity (Mutual-Capacitance). The so-called self-capacity means that both the driver and the sensing end are the same point, and the mutual capacitance is It means that the drive end and the sensing end are separated by two points. The self-capacity and mutual capacitance are not related to the characteristics of the single-point touch, but the user does not feel any difference, but at more than two points. When you touch it, there will be obvious differences in performance. For example, as shown in FIG. 2, when two fingers touch two A1 and A2 points, there are four sensing channels inside the touch IC to generate signals for sensing capacitance change, which are X1, X2, Y1, and Y2, respectively. For the IC, touch the two points A1 and A2 and touch A3 and A4. The two points are also the signal responses of the four axis sensing channels of X1, X2, Y1 and Y2, so the touch IC itself has no way to accurately determine exactly which two coordinate points are actually touched. Point, so there will be a false alarm of Ghost Points (Ghost Points), so the self-contained sensing method can not achieve multi-touch.

Referring to FIG. 3 , a schematic diagram of a display device having a self-capacitive In-Cell touch screen is disclosed. Referring to the prior art, the panel 100 includes a plurality of driving electrodes 111 and a plurality of signal lines 112 and is divided into display regions 110. In the non-display area 120, the display driving IC 200 applies a common voltage or a touch scan signal to each of the driving electrodes 111 through the respective signal lines 112, and when the driving electrodes 111 in the display area 110 of the panel 100 are driven in a self-contained manner, the display is performed. The touch sensitivity of the outer peripheral driving electrode 111 of the region 110 is not as good as the central position of the display region 110. Therefore, the blank electrode 121 is disposed adjacent to the touch electrode 111 at the outermost periphery of the display region 11 to increase the touch area to improve the touch sensitivity. The touch method of the conventional one uses a plurality of driving electrodes 111 for self-capacitance detection, that is, the same driving electrode 111 is first charged and then discharged, and the difference in the detecting capacitance of the driving electrode 111 is observed. To achieve the touch behavior, the blank electrode 121 only has the function of increasing the touch area and does not have the display function. In order to achieve better touch sensitivity, it is necessary to set The number of drive electrodes 111 and the amount of signal lines 112, however, the parasitic capacitance problem when the number of drive electrodes 111 generated by the more higher the relative touch sensitivity is also insufficient.

Accordingly, how to develop a structure without the parasitic capacitance problem and making the In-Cell TP on the OLED touch panel is the research and development focus of the present invention.

The present invention provides a touch detection device and method using a display peripheral electrode and a display electrode, the main purpose of which is to use a pixel electrode and a cathode on the touch display panel. The electrode layer is used as a display area electrode and a touch transmitting electrode (TX) to achieve image display and touch function.

The present invention provides a touch detection device and method using the peripheral electrodes and display electrodes of the display, and the second object is to use the existing pixel electrode or cathode electrode layer on the touch display panel as the display area electrode and the touch transmission. The electrode (TX) is used to achieve image display and touch function.

To achieve the above objective, the present invention is a touch display device and method using a display peripheral electrode and a display electrode, including a touch display panel, and the touch display panel sequentially sets a substrate, a pixel electrode layer, and a luminescent material from bottom to top. The layer, the cathode electrode layer and the cover plate, the pixel electrode layer and the cathode electrode layer constitute a display area electrode, and the peripheral touch receiving electrode (RX) is disposed outside the display area electrode; when the display behavior operation is performed, the touch display control is performed The unit transmits a display control signal between the pixel electrode layer and the cathode electrode layer, and drives the luminescent material layer to emit light to perform image display. When the touch operation operation is performed, the touch control signal is transmitted to the pixel through the touch display control unit. The electrode layer and the cathode electrode layer have the pixel electrode layer and the cathode electrode layer as touch emitter electrodes (TX) and emit touch signals.

To achieve the above objective, the present invention is a touch display device and method using a display peripheral electrode and a display electrode, including a touch display panel, and the touch display panel sequentially sets a substrate, a pixel electrode layer, and a luminescent material from bottom to top. The layer, the cathode electrode layer and the cover plate, the pixel electrode layer and the cathode electrode layer constitute a display area electrode, and the peripheral touch receiving electrode (RX) is disposed outside the display area electrode; when the display behavior operation is performed, the touch display control is performed The unit transmits a display control signal between the pixel electrode layer and the cathode electrode layer, and drives the luminescent material layer to emit light for image display; when the touch behavior operation is performed, the touch control unit transmits the touch control The signal is applied to the pixel electrode layer or the cathode electrode layer, and the pixel electrode layer or the cathode electrode layer is used as a touch transmitting electrode (TX) and emits a touch signal.

Preferably, the upper and lower sides of the peripheral touch receiving electrode do not form a non-touch parasitic capacitance with any conductor.

Preferably, the peripheral touch receiving electrodes are disposed on the outer side of the display area electrodes, and the distance between the touch contacts and the peripheral touch receiving electrodes is identified by detecting the size of the electrodes received by the surrounding touch receiving electrodes to confirm The position of the touch contact on the touch display panel.

Preferably, the peripheral touch receiving electrodes can be disposed at least two outside of the display area electrodes, and the position of the touch contacts on the touch display panel is calculated by an interpolation algorithm.

Preferably, the touch display control unit has a screen scanning circuit and a touch detection circuit, and the screen scanning circuit and the touch detection circuit can be integrated into the same driving IC, or integrated into the two driving ICs respectively. The driver IC can be packaged in a glass flip chip (COG), a tape and tape package (TAB), or a thin film package COF.

<知知>

100‧‧‧ panel

110‧‧‧Display area

111‧‧‧ drive electrode

112‧‧‧Signal line

120‧‧‧ non-display area

121‧‧‧Blank electrode

IC200‧‧‧ display driver

<present invention>

20‧‧‧Touch display panel

21‧‧‧ pixel electrode layer

22‧‧‧ luminescent material layer

23‧‧‧Cathode electrode layer

24‧‧‧ Cover

240‧‧‧Display area electrode

30‧‧‧ Peripheral touch receiving electrode (RX)

40‧‧‧Shield electrode layer

50‧‧‧Touch display control unit

500‧‧‧Screen scanning circuit

501‧‧‧Touch detection circuit

51‧‧‧First signal埠

52‧‧‧Second signal埠

53‧‧‧ Third signal埠

FIG. 1 is a schematic cross-sectional view of a conventional touch panel.

2 is a schematic diagram of a conventional self-contained sensing coordinate.

FIG. 3 is a schematic diagram of a conventional display device having a self-contained In-Cell touch screen.

4 is a cross-sectional view (1) showing the structure of the touch detection device of the present invention.

FIG. 5 is a cross-sectional view showing the structure of the touch detection device of the present invention (2).

6 is a schematic plan view showing the electrical connection between the touch display control unit and the touch detection device of the present invention.

FIG. 7 is a cross-sectional view showing the structure of the touch control receiving electrode of the present invention disposed on the touch detecting device.

FIG. 8 is a schematic diagram of a touch transmitting electrode and a peripheral touch receiving electrode for operating touch detection according to an embodiment of the invention.

FIG. 9 is a schematic diagram of a touch transmitting electrode and a peripheral touch receiving electrode for operating touch detection according to another embodiment of the present invention.

Referring to FIG. 4 to FIG. 9 , the touch detection device and the method for using the display peripheral electrode and the display electrode of the present invention are described in the following text. The touch detection device of the present invention can be applied to a wearable device and an Internet of Things device. The illuminating material layer 22 is disposed on the touch display panel 20, and the luminescent material layer 22 is disposed on the luminescent material layer 22, and the luminescent material layer 22 is laterally disposed. a plurality of cathode electrode layers 23, each of which is provided with a cover plate 24, wherein the pixel electrode layer 21 and the cathode electrode layer 23 constitute a display region electrode 240. In this embodiment, the pixel electrode layer 21 can be a transparent anode. The material may be TCO (Transparent Conductive Oxide), for example, ITO, IZO, ZnO, SnO ₂ , and ITO is the best material; the peripheral touch receiving electrode (RX) 30 is disposed on the touch display panel 20 or the cover 24 Either side (as shown in FIG. 7) and located outside the display area electrode 240, wherein the peripheral touch receiving electrode (RX) 30 can be fabricated on the same layer as the pixel electrode layer 21 or the cathode electrode layer 23, or Is made in different layers The shield electrode layer 40 can be disposed on the outside of the touch display panel 20 or the cover 24 as shown in FIG. 4 and FIG. 5 . When the touch display panel 20 is used as the touch side, the cover 24 is non-touch. The shielding electrode layer 40 is disposed on the outer side of the cover 24 and connected to the shielding voltage or the reference position. Otherwise, when the cover 24 is used as the touch side, the touch display panel 20 is non-touch measurement, and the shielding electrode layer 40 is disposed on the outer side of the touch display panel 20 and connected to the shielding voltage or the reference position. The shielding electrode layer 40 can prevent signal interference on the non-touch side. The touch display control unit 50 includes: the screen scanning circuit 500 and the touch The control detection circuit 501 has a first signal 埠51, a second signal 埠52, and a third signal 埠53. The first signal 埠51 is electrically connected to the touch display control unit 50 and each pixel electrode layer 21, and second. The signal 埠52 is electrically connected to the touch display control unit 50 and each of the cathode electrode layers 23, and the third signal 埠53 is electrically connected to the touch display control unit 50 and the peripheral touch receiving electrode 30 (RX); wherein the screen scanning circuit 51 And the touch detection circuit 52 can be integrated into the same driver IC, or Do two integrated driver IC, the driver IC packages may be a chip on glass (COG), tape and reel (TAB) or a thin film encapsulation (COF).

Accordingly, the touch detection device of the present invention is configured by the above-mentioned components, and the operation method of the first embodiment is as follows: when the operation screen is displayed, the display control signal is transmitted through the screen scanning circuit 500 of the touch display control unit 50. The first signal 埠51 and the second signal 埠52 are transmitted between the pixel electrode layer 21 and the cathode electrode layer 23, and the pixel electrode layer 21 and the cathode electrode layer 23 are used as the display region electrode 240, and are drawn by The electrode layer 21 and the cathode electrode layer 23 drive the luminescent material layer 22 to emit light to achieve an image display effect; when the touch detection is performed, the touch control signal 501 of the touch display control unit 50 transmits the touch control signal The first signal 埠51, the second signal 埠52, and the third signal 埠53 are transmitted to the pixel electrode layer 21, the cathode electrode layer 23, and the peripheral touch receiving electrode (RX) 30, so that the pixel electrode layer 21 and the cathode are provided. The electrode layer 23 serves as a touch transmitting electrode (TX) and receives the electrode by a peripheral touch (RX) 30 receives the touch control signal of the touch transmitting electrode (TX) to achieve the effect of mutual capacitive touch detection.

In addition, the second embodiment is also applicable to the touch detection device of the present invention. The operation method is as follows: when the touch detection is performed, the touch is controlled by the touch display control unit 50. The detecting circuit 501 transmits the touch control signal to the pixel electrode layer 21 and the peripheral touch receiving electrode (RX) 30 via the first signal 埠51 and the third signal 埠53, or by the second signal 埠52 and The third signal 埠53 transmits the touch control signal to the cathode electrode layer 23 and the peripheral touch receiving electrode (RX) 30, and the pixel electrode layer 21 or the cathode electrode layer 23 is used as the touch transmitting electrode (TX). The peripheral touch receiving electrode (RX) 30 receives the touch control signal of the touch transmitting electrode (TX) to achieve the effect of mutual capacitive touch detection.

Furthermore, it is worth mentioning that when the touch operation is performed, if the pixel electrode layer 21 is used as the touch emitter electrode (TX), the cathode electrode layer 23 must be electrically floated or connected to a fixed level. (not shown), to avoid the touch signal failure; similarly, if the cathode electrode layer 23 is used as the touch emitter electrode (TX), the pixel electrode layer 21 must be electrically floated or connected to a fixed level ( The figure is not shown) to avoid the touch signal failure.

Further, the touch detection device of the present invention has the following touch operation mode, as shown in FIG. 8 , which is an embodiment in which a single peripheral touch receiving electrode (RX) 30 is disposed outside the display area electrode 240. In this embodiment, when the finger touches the S1 signal point, the distance between the touch position D1 and the peripheral touch receiving electrode (RX) 30 is relatively close, and the peripheral touch receiving electrode (RX) 30 can obtain a higher electrode. The value of the signal, and when the finger touches the S2 signal point, the touch position D2 is far away from the peripheral touch receiving electrode (RX) 30, and the peripheral touch receiving electrode (RX) 30 obtains a relatively low electrode signal value. Therefore, the size of the electrode received by the peripheral touch receiving electrode (RX) 30 is detected to identify the touch. The distance between the contact and the peripheral touch receiving electrode (RX) 30 to confirm the position of the touch contact on the touch display panel; and, as shown in FIG. 9, at least two peripheral touch receiving electrodes (RX) The embodiment is disposed on the outer side of the display area electrode 240. In the embodiment, when the finger touches the S3 signal point, since the touch position D3 is between the two peripheral touch receiving electrodes (RX) 30, the The interpolation algorithm calculates the actual touch position.

Based on the above description, the technical features and effects of the present invention have the following points:

1. The conventional 1 uses a self-capacitance sensing method to achieve a touch target with a large number of driving electrodes, resulting in an excessive parasitic capacitance value and a reduced touch sensitivity, and the present invention employs a pixel electrode or a cathode electrode on the display panel. The layer is used as a touch transmitting electrode (TX), and the touch function is achieved in a mutually compatible manner with the peripheral touch receiving electrode (RX) 30. Therefore, the large capacitance generated by the OLED structure can be surely prevented from affecting the touch effect. .

2. The upper and lower sides of the peripheral touch receiving electrode (RX) of the present invention do not form a non-touch parasitic capacitance with any conductor, so that an excessive parasitic capacitance value can be avoided.

The touch display panel of the present invention can drive the pixel electrode layer and the cathode electrode layer as display region electrodes when no touch action occurs, and drive the luminescent material layer to emit light to achieve image display effect; When the touch behavior is generated, the pixel electrode layer or the cathode electrode layer is driven as a touch transmitting electrode (TX), and the touch receiving signal (TX) is received by the peripheral touch receiving electrode (RX). Reach the touch effect.

The above embodiments are merely illustrative of the present invention and its effects, and are not intended to limit the present invention, and those skilled in the art can modify and modify the above embodiments without departing from the spirit and scope of the invention. Therefore, the scope of protection of the present invention should be as described later. The scope of the patent application is listed.

Claims (10)

A touch detection method using a display electrode and a display electrode, comprising: a touch display panel, wherein the touch display panel is provided with a plurality of pixel electrodes, and each of the pixel electrodes is provided with a layer of a light-emitting material, the light-emitting material a plurality of cathode electrode layers are disposed on the layer, and each of the cathode electrode layers is provided with a cover plate, wherein the pixel electrode layer and the cathode electrode layer form a display area electrode; the peripheral touch receiving electrode is disposed outside the display area electrode; The control display unit has a first signal 埠, a second signal 埠, and a third signal 埠, the first signal is electrically connected to the touch display control unit and each of the pixel electrodes, and the second signal is electrically Connecting the touch display control unit and each of the cathode electrode layers, the third signal is electrically connected to the touch display control unit and the peripheral touch receiving electrode; when the operation screen is displayed, the touch display control unit transmits the The first signal 埠 and the second signal 埠 transmit a display control signal between the pixel electrode layer and the cathode electrode layer, so that the pixel electrode layer and the cathode electrode layer are The display area electrode is used to drive the luminescent material layer to emit light to achieve image display; when the touch operation operation is performed, the touch control unit transmits the touch control through the first signal 埠 and/or the second signal 埠The signal is applied to the pixel electrode layer and/or the cathode electrode layer, and the pixel electrode layer and/or the cathode electrode layer is used as a touch emitter electrode (TX) and emits a touch signal, and is received by the peripheral touch receiving electrode (RX). Launch touch signals for touch detection. The touch detection using the display peripheral electrode and the display electrode as described in claim 1 The method, wherein the upper and lower sides of the peripheral touch receiving electrode do not form a non-touch parasitic capacitance with any conductor. The touch detection method of the display peripheral electrode and the display electrode according to claim 1, wherein the peripheral touch receiving electrode is disposed on the outer side of the display area electrode, and the peripheral touch receiving is detected by detecting The size of the electrode received by the electrode identifies the distance between the touch contact and the peripheral touch receiving electrode to confirm the position of the touch contact on the touch display panel. The touch detection method of the display peripheral electrode and the display electrode according to claim 1, wherein the peripheral touch receiving electrode can be disposed at least two outside of the display area electrode, and is calculated by an interpolation algorithm. The position of the touch contact on the touch display panel. The touch detection method of the display peripheral electrode and the display electrode according to claim 1, wherein the peripheral touch receiving electrode is formed on the same layer as the pixel electrode layer or the cathode electrode layer, or Different layers are produced together. The touch detection method using the display peripheral electrode and the display electrode according to claim 1, wherein the cathode electrode layer is electrically floated or connected only when the pixel electrode layer is used as the touch emitter electrode. To a fixed level, when the cathode electrode layer is used as the touch emitter electrode, the pixel electrode layer is electrically floated or connected to a fixed level. The touch detection method of the display peripheral electrode and the display electrode according to claim 1, wherein the shielding electrode layer is further disposed on the non-touch side, and the shielding voltage or the reference position is connected. The touch detection method using the display peripheral electrode and the display electrode as described in claim 1, wherein the touch display control unit has a screen scanning circuit and a touch detection circuit, and the screen scanning circuit and the touch detection The test circuit can be integrated into the same driver IC or integrated into the two driver ICs, and the driver IC can be packaged in a glass flip chip (COG), a tape reel package (TAB) or a thin film package (COF). The touch detection method using the display peripheral electrode and the display electrode as described in claim 1, wherein the touch detection device can be applied to a wearable device, an Internet of Things device, a handheld device, or a meter. A touch detection device using a display electrode and a display electrode, comprising: a touch display panel, wherein the touch display panel is provided with a plurality of pixel electrodes, and each of the pixel electrodes is provided with a layer of a light-emitting material, the light-emitting material a plurality of cathode electrode layers are disposed on the layer, and each of the cathode electrode layers is provided with a cover plate, wherein the pixel electrode layer and the cathode electrode layer form a display area electrode; the peripheral touch receiving electrode is disposed outside the display area electrode; The control display unit has a first signal 埠, a second signal 埠, and a third signal 埠, the first signal is electrically connected to the touch display control unit and each of the pixel electrodes, and the second signal is electrically Connecting the touch display control unit and each of the cathode electrode layers, the third signal is electrically connected to the touch display control unit and the peripheral touch receiving electrode; when the operation screen is displayed, the touch display control unit transmits the The first signal 埠 and the second signal 埠 transmit a display control signal between the pixel electrode layer and the cathode electrode layer, so that the pixel electrode layer and the cathode electrode layer are So that the display electrode area For driving the luminescent material layer to emit light to achieve image display; when the touch operation operation is performed, the touch control signal is transmitted to the picture through the first signal 埠 and/or the second signal 透过 through the touch display control unit The electrode layer and/or the cathode electrode layer, the pixel electrode layer and/or the cathode electrode layer are used as a touch emitter electrode (TX) and emit a touch signal, and the peripheral touch receiving electrode (RX) receives the touch touch Signal, for touch detection.