TWI395173B - Touch sensor, touch screen panel, and touch screen module - Google Patents

Description

Touch sensor and touch display panel and touch display module

The present invention relates to a touch sensor and a touch display panel thereof, and more particularly to a touch sensor using a sensing channel generated by compression and a touch display panel thereof.

The technology of the touch display panel has been widely used in electronic devices, such as mobile phones, notebook computers, music players (MP3), personal digital assistants (PDAs), global satellite positioning systems (GPS), ultra-mini computers (UMPC). Among other portable electronic products, one of the application fields of the touch display panel can be peeped.

The technical principle of the traditional touch panel is mainly divided into resistance type and capacitive type. The principle of the resistive sensing method is to cover two transparent conductive films on the surface of the display panel, for example, a thin film resistor. When the display panel is externally pressed, the conductive films will touch each other to generate a voltage change. The principle of the capacitive sensing method is to apply a plurality of transparent conductive films on the display panel and apply a bias voltage to the electrodes on both sides of the conductive film to generate a uniform low-voltage electric field. When the display panel is subjected to static electricity, for example, electrostatic induction of a finger. At this time, the conductive film generates a potential change of the capacitance. The position of the touched surface is known by the positioning mode of the conductive film and according to the voltage change or the potential change.

In addition, the optical touch panel circuit design (Planar Systems, Inc.) published by Active Matrix LCD with Integrated In the technical literature of Optical Touch Screen, a photo-sensing transistor (Photo TFT) is disposed in a pixel array of a panel, so that the driven photo-sensing transistor generates a voltage change under the change of ambient light.遂 Use this voltage change to know where you are touching. However, this optical touch panel has a great influence on the variability of ambient light, that is, under low illumination ambient light, the sensitivity of the circuit is greatly reduced, and the position touched cannot be correctly judged.

The invention relates to a touch sensor and a touch display panel thereof. The touch sensor is based on a circuit structure of a panel, and when the panel is touched, a driven electrode and a corresponding switching component are changed. The spacing of the active layers induces a channel on the active layer and produces a corresponding sensing signal. In addition, by integrating a plurality of touch sensors in the display panel to achieve a touch display panel, for example, a one-touch type or a multi-touch touch type display panel.

According to a first aspect of the present invention, a touch sensor is provided, comprising a first substrate, a second substrate, a sensing electrode and an inductive switching element. The second substrate is disposed opposite to the first substrate. The sensing electrode is located on the first substrate. The inductive switching element is located on the second substrate and includes a first switching electrode, a second switching electrode and an active layer. The active layer is disposed between the first switch electrode and the second switch electrode and is in contact with the first switch electrode and the second switch electrode. The active layer is opposite to the sensing electrodes and spaced apart from each other. When the first substrate or the second substrate is pressed, the sensing electrode and the active layer are changed When the distance is between, the driven sensing electrode induces a channel corresponding to the change of the pitch on the active layer, so that the first switching electrode and the second switching electrode are turned on.

According to a second aspect of the present invention, a touch display panel includes a first substrate, a second substrate, a pixel array, and a plurality of touch sensors. The second substrate is disposed opposite to the first substrate. The pixel array is disposed between the first substrate and the second substrate. Each of the touch sensors includes an inductive electrode and an inductive switching element. The sensing electrode is located on the first substrate. The inductive switching element is located on the second substrate. The inductive switching element includes a first switching electrode, a second switching electrode, an active layer, a dielectric layer and a light shielding layer. The active layer is disposed between the first switch electrode and the second switch electrode and is in contact with the first switch electrode and the second switch electrode. The active layer is opposite to the sensing electrodes and spaced apart from each other. The active layer, the first switching electrode and the second switching electrode are covered on the dielectric layer. The light shielding layer is located between the second substrate and the dielectric layer and opposite to the active layer. When the first substrate or the second substrate is pressed to change the distance between the sensing electrode and the active layer, the driven sensing electrode induces a channel corresponding to the pitch change on the active layer, so that the first switching electrode and the first The two switch electrodes are turned on, and when at least one of the first switch electrode and the second switch electrode is driven, a corresponding sensing signal is generated between the first switch electrode and the second switch electrode.

According to a third aspect of the present invention, a touch display module is provided, comprising a touch display panel and a read circuit. The touch display panel includes a first substrate and a second substrate disposed oppositely, a pixel array disposed between the first substrate and the second substrate, and a plurality of touch sensors. Each of the touch sensors includes an inductive electrode and an inductive switching element. Induction electrode Located on the first substrate. The inductive switching element is located on the second substrate. The inductive switching element includes a first switching electrode, a second switching electrode, an active layer, a dielectric layer and a light shielding layer. The active layer is disposed between the first switch electrode and the second switch electrode and is in contact with the first switch electrode and the second switch electrode. The active layer is opposite to the sensing electrodes and spaced apart from each other. The active layer, the first switching electrode and the second switching electrode are covered on the dielectric layer. The light shielding layer is located between the second substrate and the dielectric layer and opposite to the active layer. When the first substrate or the second substrate is pressed to change the distance between the sensing electrode and the active layer, the driven sensing electrode induces a channel corresponding to the pitch change on the active layer, so that the first switching electrode and the first The two switch electrodes are turned on, and when at least one of the first switch electrode and the second switch electrode is driven, a corresponding sensing signal is generated between the first switch electrode and the second switch electrode. The reading circuit is configured to receive the sensing signal of at least one of the touch sensors, and the sensing signal is a current signal. The read circuit is used to convert the current signal into an output signal.

According to a fourth aspect of the present invention, a touch sensor is provided, including a first substrate, a second substrate, an inductive electrode, and an inductive switching element. The second substrate is disposed opposite to the first substrate. The sensing electrode is located on the first substrate. The inductive switching element is located on the second substrate and includes a source, a drain, an active layer and a gate. The active layer is disposed between the source and the drain and is in contact with the source and the drain. The active layer is opposite to the sensing electrodes and spaced apart from each other. The gate is opposite to the active layer and is vacant. When the first substrate or the second substrate is pressed to change the distance between the sensing electrode and the active layer, the driven sensing electrode induces a channel corresponding to the pitch change on the active layer, so that The source and the drain are turned on.

According to a fifth aspect of the present invention, a touch display panel includes a first substrate, a second substrate, a pixel array, and a plurality of touch sensors. The second substrate is disposed opposite to the first substrate. The pixel array is disposed between the first substrate and the second substrate. Each of the touch sensors includes a sensing electrode and a thin film transistor. The sensing electrode is located on the first substrate. The thin film transistor is on the second substrate. The inductive thin film transistor has a source, a drain, an active layer and a gate. The active layer is disposed between the source and the drain and is in contact with the source and the drain. The active layer is opposite to the sensing electrodes and spaced apart from each other. The gate is opposite to the active layer and is vacant. When the first substrate or the second substrate is pressed to change the spacing between the sensing electrode and the active layer, the driven sensing electrode induces a channel corresponding to the pitch change on the active layer to make the source and the drain Turning on, and generating a corresponding sensing signal between the source and the drain when at least one of the source and the drain is driven.

In order to make the above description of the present invention more comprehensible, the preferred embodiments of the present invention are described in detail below with reference to the accompanying drawings.

First embodiment

Please refer to FIG. 1A, which is a structural diagram of a touch sensor according to a first embodiment of the present invention. The touch sensor 110 includes a first substrate 120, A second substrate 130, a sensing electrode 140 and an inductive switching element 150. The second substrate 130 is disposed opposite to the first substrate 120. The sensing electrode 140 is located on the first substrate 120. The inductive switching element 150 is located on the second substrate 130.

The inductive switching element 150 includes a first switching electrode 151, a second switching electrode 152, and an active layer 153. The active layer 153 is disposed between the first switch electrode 151 and the second switch electrode 152 and is in contact with the first switch electrode 151 and the second switch electrode 152. The active layer 153 is opposite to the sensing electrode 140 and spaced apart by a distance d1. The first switch electrode 151 and the second switch electrode 152 in this embodiment may be disposed on both sides of the active layer 153 and cover a portion of the active layer 153; in other implementations, the two switch electrodes 151 and 152 The setting relationship and the composition may be changed. For example, the two switch electrodes 151 and 152 are respectively disposed on and electrically connected to the active layer 153, and further include a metal layer and a doped layer such as an n+ layer, or other The doped layer is changed to a different material to enhance the electrical conduction effect with the active layer 153.

Please refer to FIG. 1B at the same time, which is a structural diagram of the touch sensor inducing the track when pressed according to the first embodiment of the present invention. When one of the first substrate 120 or the second substrate 130 is pressed by an external force, the distance d1 between the sensing electrode 140 and the active layer 153 is changed, for example, the pitch d1 in FIG. 1A is reduced to the pitch d2 in the first FIG. At this time, the driven sensing electrode 140 induces a channel corresponding to the change of the pitch d1 on the active layer 153, and turns on the first switching electrode 151 and the second switching electrode 152.

The circuit diagram of the above touch sensor 110 will be described below. Please refer to FIG. 2A and FIG. 2B simultaneously, which respectively show circuit diagrams of the touch sensor according to the first embodiment of the present invention, and the sensing signal generated when the touch sensor is pressed according to the first embodiment of the present invention. Schematic diagram of the circuit. The sensing electrode 140 is configured to receive a first signal to be driven, the first switching electrode 151 is configured to receive a second signal from the trace Y to be driven, and the second switching electrode 152 is configured to receive the trace from the trace One of the third signals of X is driven. In some embodiments, the second switch electrode 152 may also receive no signal, but when the first switch electrode 151 and the second switch electrode 152 are turned on, the output signal Si generated between the first switch electrode 151 and the second switch electrode 152 is outputted by the trace X. The sensing signal Si is transmitted out.

When the first switch electrode 151 and the second switch electrode 152 are turned on, a corresponding sense signal Si is generated, or the sense signal Si is changed, for example, a voltage value, a current value, or a waveform change. Therefore, whether the sensing signal Si is generated or not changes can reflect whether the touch sensor 110 is pressed, that is, whether the distance between the sensing electrode 140 of the touch sensor 110 and the active layer 153 is changed. . In addition, the touch sensor 110 is changed from the state of being pressed to the state of being uncompressed, and the change of the pitch is increased, reflecting the change of the sensing signal Si, so that the situation can also be detected.

In the embodiment, the active layer 153 induces a channel and the channel turns on the first switch electrode 151 and the second switch electrode 152. A top-gate field-effect transistor (field-effect transistor) can be applied. , FET) explains the principle of generating channels. However, worth it It is noted that the sensing electrode 140 of the touch sensor 110 is separated from the sensing switching element 150 and has a variable spacing, and the channel induced by the active layer 153 corresponds to the change of the spacing. relationship.

In addition, the driving manner of the sensing electrode 140 and the inductive switching element 150 can also be explained by the driving method of the field effect transistor. For example, in order for the active layer 153 to generate a channel, such as an n-channel, the sensing electrode 140 is driven in such a manner that the sensing electrode 140 is energized to induce a channel on the active layer 153 at a distance therefrom. Similarly, if the touch sensor 110 is set to generate a p-channel, the driving considerations are also the same. In short, as long as the driving sensing electrode 140 and the active layer 153 can be spaced apart at a certain interval, the channel can be induced in the active layer 153. In this case, the first switching electrode 151 and the second switching electrode 152 are added. The appropriate sensing signal Si can be obtained from the first switching electrode 151 or the second switching electrode 152 by appropriate driving, for example, by applying a bias voltage or a bias current.

Although, in the operation of the sensing electrode 140 and the inductive switching element 150 of the touch sensor 110, how the principle of inducing the active layer 153 to the channel is different from that of the field effect transistor, but for convenience of explanation In the following embodiments and figures, we will employ a circuit component symbol similar to a field effect transistor to represent the touch sensor in various embodiments in accordance with the present invention.

In some embodiments of the present disclosure, the touch sensor 110 described above can be applied to a touch display panel. Please refer to FIG. 1C, which illustrates the touch sensor 110 applied to the touch according to the first embodiment of the present invention. Structure diagram when the panel is displayed. In FIG. 1C, the inductive switching element 150 shown in FIG. 1A further includes a dielectric layer 154 and a light shielding layer 155. The active layer 153, the first switch electrode 151 and the second switch electrode 152 are overlying the dielectric layer 154. The light shielding layer 155 is located between the second substrate 130 and the dielectric layer 154 and opposite to the active layer. Since the light of the backlight enters from the second substrate 130 in the touch display panel generally using the backlight, when the touch sensor 110 of the present invention is applied to the display panel, the light shielding layer can be used. 155 is used to conceal the light entering the second substrate 130 and illuminating the active layer 153 to prevent the active layer 153 from being affected by the light source of the display panel.

Please refer to FIGS. 3A and 3B at the same time. FIG. 3A is a schematic diagram of the touch sensor of FIG. 1C applied to the touch type liquid crystal display panel. Fig. 3B is a cross-sectional view showing the touch type liquid crystal display panel according to the section line AA' in Fig. 3A. The liquid crystal display panel 300 includes a first substrate 120, a second substrate 130, a pixel array, and a plurality of touch sensors. For simplification of the description, the 3A and 3B diagrams show a touch sensor 110 and three pixels 160 of the pixel array as an example. The second substrate 130 is disposed opposite to the first substrate 120. The pixel array is disposed between the first substrate 120 and the second substrate 130. The three pixels 160 in the 3A and 3B drawings can be regarded as three sub-pixels of the color liquid crystal display panel.

The touch sensor 110 is disposed between the first panel 120 and the second panel 130, that is, in the pixel array. Therefore, the touch sensor 110 can be set in the manufacturing process of the display panel, so that the circuit and the pixel array of the touch sensor can be integrated in a touch display panel. In a real In an example, an electrode is formed on a color filter plate of a liquid crystal display to implement the sensing electrode 140, and an inductive switching element 150 is formed on a thin-film transistor plate. Moreover, in other examples, the sensing electrode 140 can implement the sensing electrode 140 using bumps. Moreover, the characteristics of the dielectric material can be considered to design the distance between the sensing electrode 140 and the sensing switch element 150; and the shape, length, width or depth of the sensing electrode 140 can also be related to the characteristics of the dielectric material and the electrical requirements of the actual layout. And consider it. In summary, in practice, as in the above-described implementation example, the drive layer 140 and the inductive switching element 150 can be induced to exit the active layer 153 at a certain pitch.

Various embodiments in which the touch sensor of the present invention is applied to a touch display panel and embodiments thereof are described below.

Second embodiment

In this embodiment, the light shielding layer 155 of FIG. 1C is, for example, a control electrode having a metal material. In this case, the first switch electrode 151, the second switch electrode 152, and the control electrode form, for example, a thin film transistor ( Thin film transistor (TFT) structure. The example in which the inductive switching element 150 is achieved by a thin film transistor is taken as an example. Please refer to FIG. 4, which is a circuit diagram of a touch-type liquid crystal display panel according to a second embodiment of the present invention. The thin film transistor 450 has a source 450s, a drain 450d, a gate 450g, and an active layer (not shown in FIG. 4), which respectively correspond to the first switch electrode 151 and the second switch of the inductive switching element. Electrode 152, control electrode 155 and active layer 153. The thin film transistor 450 is, for example, an amorphous germanium thin film transistor (amorphous silicon TFT), or poly-silicon TFT.

The operation of this embodiment will be described below. As shown in FIG. 4, the sensing electrode 140 is configured to receive a first signal and is driven, for example, an external voltage signal Vr. The source 450s is driven to receive a second signal, and the second signal is a voltage signal, such as a scan signal Gn generated by a gate driver (not shown in FIG. 4). The gate 450g is driven to receive a fourth signal, such as another external voltage signal Vr2. When the source 450s and the drain 450d are turned on, a corresponding sensing signal Si is generated, and the drain 450d is used to output the sensing signal Si. Therefore, whether or not the touch sensor 110 is pressed can be known by the presence or absence of the induced signal Si or its change.

In the panel layout, since the scan signal Gn is used to drive one column of the pixel array, for example, the nth column, the touch sensors 110 receiving the scan signal Gn can be disposed in the column adjacent to the pixel array. At the office. Therefore, in this embodiment, since the source 450s of the touch sensor 110 is driven by receiving the adjacent scan signal Gn, no additional wiring is needed to receive the signal at a remote location, and the signal can be further Save circuit wiring and increase costs.

In addition, in the case where the thin film transistor 450 is, for example, an amorphous germanium thin film transistor, the active layer of the thin film transistor 450 is photoinduced by light, so that the gate of the thin film transistor 450 can be regarded as a light shielding structure layer (black). Matrix), and can also be a gate signal structure layer at the same time to reduce the phenomenon of light induction.

It can be seen from the embodiment that when the touch sensor and the pixel array are integrated in a touch display panel, the layout manner is also related to the signal source of the driving of the touch sensor. Therefore, when the touch sensor is in a combination of different driving sources, the user can relatively make a different circuit layout according to the driving source, for example, the layout design of the relevant wiring, in accordance with an embodiment of the present invention. Implement this touch display panel.

Third embodiment

Please refer to FIG. 5, which is a circuit diagram of a touch-type liquid crystal display panel according to a third embodiment of the present invention. The present embodiment is different from the second embodiment in that the control electrode is electrically connected to one of the first switch electrode 151 and the second switch electrode 152. That is, the gate 450g is electrically connected to one of the source 450s and the drain 450d. In Fig. 5, the description is made by taking a gate 450g electrically connected to the source 450s as an example. Since the source 450s receives the scan signal Gn to be driven, it is known that the gate 450g also receives the scan signal Gn to be driven. Thus, the thin film transistor 450 of the present embodiment can be regarded as a diode element.

When the voltage signal Vr senses the channel and the source 450s and the drain 450d are turned on, that is, the diode element will be turned on, and an induced signal Si corresponding to the scan signal Gn is generated. In this way, the present embodiment can also know whether the touch sensor 110 is pressurized by the presence or absence of the sensing signal Si or its change.

Fourth embodiment

Please refer to FIG. 6, which is a circuit diagram of a touch-type liquid crystal display panel according to a fourth embodiment of the present invention. Therefore, it is known that the gate 450g does not receive signals and is not driven.

Since in the second and third embodiments, the gate 450g is driven to receive the fourth signal, for example, receiving another voltage signal Vr2 in the second embodiment or receiving the scan signal Gn in the third embodiment. . However, in practice, the Applicant has found that when a gate 450g (i.e., the light-shielding layer 155 of FIG. 1C, which is a control electrode having a metal material) is driven to receive a voltage signal, an electric field is generated. The electric field may affect the ability of the sensing electrode 140 to induce a channel on the active layer 153.

Moreover, the Applicant has also found that because the distance between the active layer 153 and the gate 450g which are also on the second substrate 130 is relatively close (about 1000 to 2000 Angstrom), and is located on the second substrate 130. The distance between the active layer 153 and the sensing electrode 140 on the first substrate 120 is relatively far (about 1 to 2 micrometers (μm)). Thus, if the same driving signal, the magnitude of the electric field generated by the gate 450g on the active layer 153 will be greater than the magnitude of the electric field generated by the sensing electrode 140 on the active layer 153. Therefore, when the active layer 153 is induced to generate a channel, the driven gate 450g may affect the ability of the sensing electrode 140 to sense the channel, resulting in a decrease in sensitivity of the sensing electrode 140 to the sensing channel. Therefore, in this embodiment, the gate 450g is vacantly connected to be undriven, so that when the sensing electrode 140 is in the sensing channel, the effect of the gate 450g may be reduced.

Thus, when the source 450s and the drain 450d are turned on, a feeling is generated. Should signal Si. Moreover, since the gate of the empty gate 450g may cause the sensing electrode 140 to increase the sensitivity to the sensing signal Si. Therefore, the present embodiment can know whether the touch sensor 110 is pressed by the presence or absence of the sensing signal Si or the change thereof, and can also have a better process in sensing whether the voltage is under pressure. Sensing sensitivity.

Fifth embodiment

Please refer to FIG. 7, which is a circuit diagram of a touch-type liquid crystal display panel according to a fifth embodiment of the present invention. The circuit of the display panel of this embodiment is similar to the circuit of the display panel of the fourth embodiment, except that the touch sensor 110 is driven by different driving signals.

In the present embodiment, the sensing electrode 140 receives, for example, a common voltage Vcom to be driven. This common voltage Vcom is used to drive the pixel array. The source 450s is driven to receive the scan signal Gn generated by the gate driver, and the gate 450g is vacant. The bungee 450d is used to output the sensing signal Si. Therefore, whether or not the touch sensor 110 is pressed can be known by the presence or absence of the induced signal Si or its change.

Sixth embodiment

In this embodiment, the light shielding layer 155 of the touch sensor 110 of FIG. 1C is, for example, a black matrix having an insulating material, and may also be referred to as a black matrix. Please refer to FIG. 8 , which is a circuit diagram of a touch-type liquid crystal display panel according to a sixth embodiment of the present invention. Since the light shielding structure layer of the insulating material is used as the light shielding layer in this embodiment, it is different from the second The control electrode of the metal material used in the embodiment. Therefore, in this embodiment, the touch sensor of the present embodiment is represented by a circuit component symbol similar to the field effect transistor but having no gate terminal, such as the seventh. The touch sensor 110 is shown.

In the embodiment, the sensing electrode 140 is configured to receive an external voltage signal Vr to be driven, and the first switching electrode 151 of the touch sensor 110 is configured to receive the scan signal Gn to be driven, when the first switch electrode When the second switch electrode 152 is turned on, a corresponding sensing signal Si is generated, and the second switch electrode 152 is used to output the sensing signal Si. Therefore, whether or not the touch sensor 110 is pressed can be known by the presence or absence of the induced signal Si or its change.

The touch sensor 110 of this embodiment also does not affect the sensitivity of the sensing electrode 140 to induce a channel on the active layer 153. In the fourth and fifth embodiments described above, the light shielding layer 155 having a metal material is made vacant, and in this embodiment, the light shielding structure layer having an insulating material is used as the light shielding layer 155, so that the insulating light shielding layer 155 is provided. The electric field is also not generated, so the sensitivity of the sensing electrode 140 to the sensing channel on the active layer 153 is not affected. In this way, the embodiment can know whether the touch sensor 110 is under pressure, and can also have better sensing sensitivity during sensing whether it is under pressure.

Seventh embodiment

Please refer to FIG. 9, which is a circuit diagram of a touch-type liquid crystal display panel according to a seventh embodiment of the present invention. The circuit of the display panel of this embodiment is similar to the circuit of the display panel of the sixth embodiment, and the difference is that The touch sensor 110 is driven by different drive signals.

In the present embodiment, the sensing electrode 140 receives, for example, a voltage signal Vr to be driven, and the first switching electrode 151 also receives the voltage signal Vr to be driven, and the second switching electrode 152 is configured to output the sensing signal Si. Therefore, whether or not the touch sensor 110 is pressed can be known by the presence or absence of the induced signal Si or its change.

Eighth embodiment

Please refer to FIG. 10, which is a circuit diagram of a touch-type liquid crystal display panel according to an eighth embodiment of the present invention. The circuit of the display panel of this embodiment is similar to the circuit of the display panel of the sixth embodiment, except that the touch sensor 110 is driven by different driving signals.

In the present embodiment, the sensing electrode 140 receives, for example, a common voltage Vcom to be driven, and the first switching electrode 151 receives the scanning signal Gn to be driven, and the second switching electrode 152 is configured to output the sensing signal Si. Therefore, whether or not the touch sensor 110 is pressed can be known by the presence or absence of the sensing signal si or its change.

In the above disclosed embodiment of the present invention, the touch sensor 110 can also be applied to a touch display module. Please refer to FIG. 11A, which is a schematic diagram showing an example of a touch display module applied to an embodiment of the present invention. The touch display module 500 is configured to know whether the touch sensor is pressurized according to whether the sensing signal Si is generated or not. In some examples, the touch display module 500 can determine according to at least one sensing signal. The location of the touch.

In FIG. 11A, the touch display module 500 includes a touch display panel 520, a readout integrated circuit (Readout-IC) 540, a positioning circuit 560, and a gate driver 580. The touch display panel 520 is, for example, a touch display panel to which the touch sensor 110 of the present invention is applied as described in one of the second to eighth embodiments.

Furthermore, as shown in FIG. 11A, the touch display panel 520 is configured to receive the scan signal Gn of the gate driver 580 to be driven. However, it is not limited to this. Please refer to FIG. 11B, which is a schematic diagram showing another example of a touch display module applied to an embodiment of the present invention. In FIG. 11B, the touch display module 500 can further include a touch control circuit 590 for providing the voltage signal Vr or Vr2 described above to drive the touch display panel 520. As such, in the embodiment of the present invention, the driving signal of the touch display panel 520 may include at least one of the scan signal Gn, the voltage signals Vr, and Vr2. That is, the touch display panel 520 can be driven by the gate driver 580 that drives the pixel array, as shown in FIG. 11A; or the touch display panel 520 can also be driven by the gate driver 580 and an external circuit (such as the above). The touch control circuit 590) is driven as shown in FIG. 11B.

The touch display module 500 of FIG. 11A is taken as an example for explanation. In FIG. 11A, the reading circuit 520 is configured to receive the sensing signal Si of at least one of the touch sensors, and the sensing signal Si is a current signal. The read circuit 520 is used to convert the current signal into an output signal So. Please refer to FIG. 12 to FIG. 16 , which are diagrams respectively showing an example of a circuit diagram of the reading circuit 520 of the touch display module according to the embodiment of the present invention. In Figure 12, The read circuit 540 includes a current-to-voltage amplifier 442, which includes, for example, an operational amplifier OP1 for converting the induced signal Si of the current signal into a first voltage signal V1. The read circuit 540 uses the first voltage signal V1 as the output signal So.

In FIG. 13, the read circuit 540 includes a current-to-voltage amplifier 442 and a comparison amplifier 444 shown in FIG. The comparison amplifier includes, for example, an operational amplifier OP2 for comparing the first voltage signal V1 with a reference voltage Vref to output a second voltage signal V2. The read circuit 540 uses the second voltage signal V2 as the output signal So.

In FIG. 14, the read circuit 540 includes a current-to-voltage amplifier 442, an inverting amplifier 446, and a comparison amplifier 444 shown in FIG. The inverting amplifier 446 includes, for example, an operational amplifier OP3 for inverting and amplifying the first voltage signal V1 to a second voltage signal V2'. The comparison amplifier 444 is configured to compare the second voltage signal V2' with a reference voltage Vref2 to output a third voltage signal V3. The read circuit 540 uses the third voltage signal V3 as the output signal So.

In FIG. 15, the read circuit 540 includes a current to voltage amplifier 442 shown in FIG. 12, and an analog to digital converter (ADC) 448. The analog digital converter 448 is configured to convert the analog first voltage signal V1 to a digital voltage signal Vd. The read circuit 540 uses the digital voltage signal Vd as the output signal So.

In FIG. 16, the read circuit 540 includes a current-to-voltage amplifier 442, an inverting amplifier 446, and an analog-to-digital converter 448 shown in FIG. Analog to digital converter 448 for converting analogous second voltage signals The number V2' is a digital voltage signal Vd2. The read circuit 540 uses the digital voltage signal Vd2 as the output signal So.

In the example illustrated in Figures 12 to 16, the characteristics of the circuit that is used to touch the sensor can be used to cause the read circuit 540 to read the sensing signal Si, and according to the sensing signal Si, for example, corresponding The current changes are applied to implement various correlation analysis with whether the sensed touch sensor 110 is stressed or stressed. In these examples, the sensing signal Si received by the reading circuit 520 is a signal in the form of a current. That is, the sensing signal Si sensed by the touch sensor is a current signal, and thus, compared to the voltage signal, the current signal may be less susceptible to the components of the panel layout from the touch panel 520. The voltage coupling effect is affected, so that the sensing signal Si can be stably transmitted to the reading circuit 520 outside the panel.

Continuing to refer to FIG. 11A, in one embodiment, the touch sensors of one row are coupled to the read circuit 540 for jointly outputting the sensing signal Si. As such, when the read circuit 540 provides the output signal So according to the sensing signal Si, the positioning circuit 560 can position the touch display panel 520 according to the output signal So outputted by the read circuit 540.

In another embodiment, the gate driver 580 is configured to generate a scan signal Gn for driving one of the pixel arrays, and the touch display panel 520 is driven by the gate driver 580 to display a picture. One of the touch sensors is configured to receive the scan signal Gn for being driven, and the touch sensors of the column receiving the scan signal Gn are disposed adjacent to the column of the pixel array. As such, the positioning circuit 560 can also be based on the scan signal Gn. Determining whether the touch sensor that generates the sensing signal Si lists the touch sensors for this purpose, and determining the position of the touch sensor touched by the sensing signal Si to position the touch The display panel 520 is touched. That is, when the reading circuit 540 receives the sensing signal Si from the touch sensors of one row and outputs the signal So, the positioning circuit 560 can locate the touch according to at least the scanning signal Gn and the output signal So. The display panel 520 is touched.

For example, the touch display module 500 of the embodiment of the present invention can apply the touch signal Gn and the output signal So according to the touch display panel of the second to sixth and eighth embodiments. Position the touched position. Since the touch sensor is driven by a scan signal Gn driving a column (represented as one column in the horizontal direction), the touch sensor is disposed near the column of pixels. Therefore, the positioning circuit 560 can determine the longitudinal coordinate Dy of the touch sensor on the touch display panel 520 from the scan signal Gn.

Furthermore, it is assumed that the touched touch sensor is the Yth touch sensor of the column of touch sensors so that one of the Y touch sensors is included (represented as straight) One of the plurality of touch sensors outputs a sensing signal Si in common. Thus, when the reading circuit 540 receives the sensing signal Si and causes the positioning circuit 560 to detect the output signal So, the positioning circuit 560 can determine that the touch sensor is touched by the touch sensor. The lateral coordinate Dx on the panel 520. In this way, the positioning circuit 560 can locate the position of the touch sensor that is touched according to the lateral coordinate and the longitudinal coordinate (Dx, Dy), and can know the position of the touch display panel 520 being touched. .

In the example where the touch sensor receives the scan signal Gn for being driven, the touch display module 500 may further include a controller (not shown). The controller is used to control the gate driver 580 to enable the gate driver 580 to sequentially output scan signals. That is, the controller will be able to control the timing of the scan signal Gn, and the positioning circuit 560 can refer to the timing controlled by the controller to locate the touched sensors that are driven. In practice, the positioning circuit 560 can be implemented in the internal circuitry of the controller. For example, the controller can be implemented by a Field Programmable Gate Array (FPGA), and the positioning circuit 560 can be implemented in a logic gate array of the FPGA. However, the positioning circuit 560 can also be implemented in an external circuit of the controller described above. It is within the scope of the present invention to provide a positioning circuit for locating the touched position by means of the sensing signal Si.

Although several embodiments of the above-described touch sensor integrated with the pixel array are exemplified by a pixel and a touch sensor. However, in other embodiments, the touch sensor and the pixels may have different combinations, such as being arranged in a pixel array at a certain or different distribution ratio; for example, a part of the touch sensor Can be set or extended beyond the display area of the pixel array for other applications. For example, by arranging a plurality of touch sensors between the pixel arrays, and detecting a plurality of sensing signals that are touched by the touch sensors, thereby different fingers or at the same time The touch position of the object on the panel can be positioned, so that a multi-touch display panel can be achieved. In addition, by detecting the sensing signal and the needs of the actual application, it can also be set It is counted as a one-touch display panel.

In addition, the above-mentioned related embodiments take the integration mode of the liquid crystal panel as an example, but other display panel technologies can implement the touch display panel disclosed in the present invention as long as the touch sensor can be constructed between the upper and lower substrates. In addition, the inductive switching element and the auxiliary switching element of the touch display panel embodiment are exemplified by a thin film transistor, but the invention is not limited thereto. In other panel technologies, the sensing electrode can be used to make the switching element generate a channel. To implement the touch display panel as in the above embodiment.

The touch sensor disclosed in the above embodiments of the present invention is disposed between the first panel and the second panel. Therefore, the touch sensor can be simultaneously set in the manufacturing process of the display panel, so that integration can be achieved. One of the touch panel display panels in the panel process. In addition, in the touch-type liquid crystal display panel disclosed in the above embodiments of the present invention, the touch sensor can be driven by the gate driver, such as receiving the adjacent scanning signal, so that no additional wiring is needed for receiving. The signal at a far distance can save circuit wiring and increase the cost. Also, in some embodiments, the auxiliary switching element is selectively turned on so that the pressurized touch sensor selectively generates an inductive signal, thereby achieving power saving. In addition, since the above embodiment of the present invention utilizes the sensing channel generated by the pressure to sense the occurrence or position of the touch, there is no problem that the optical touch panel has a great influence on the variability of the ambient light. And there is no capacitive touch panel that can only be used to limit the ability of conductive objects (such as fingers) to touch on the panel.

In summary, although the present invention has been disclosed above in the preferred embodiment, It is not intended to limit the invention. A person skilled in the art can make various changes and modifications without departing from the spirit and scope of the invention. Therefore, the scope of the invention is defined by the scope of the appended claims.

110‧‧‧Touch sensor

120‧‧‧First substrate

130‧‧‧second substrate

140‧‧‧Induction electrode

150‧‧‧Inductive switching components

151‧‧‧First switch electrode

152‧‧‧Second switch electrode

153‧‧‧ active layer

154‧‧‧ dielectric layer

155‧‧‧Lighting layer

160‧‧‧ pixels

300‧‧‧LCD panel

450‧‧‧film transistor

450s‧‧‧ source

450d‧‧‧Bungee

450g‧‧‧ gate

500‧‧‧Touch display module

520‧‧‧Touch display panel

540‧‧‧Read circuit

560‧‧‧ Positioning circuit

580‧‧‧gate driver

D1, d2‧‧‧ spacing

Gn‧‧‧ scan signal

Si‧‧‧ induction signal

Vcom‧‧‧Common voltage

Vr, Vr2‧‧‧ voltage signal

X, Y‧‧‧ trace

FIG. 1A is a structural diagram of a touch sensor according to a first embodiment of the present invention.

FIG. 1B is a structural diagram of the touch sensor inducing the track when it is pressed according to the first embodiment of the present invention.

FIG. 1C is a structural diagram showing the touch sensor 110 applied to the touch display panel according to the first embodiment of the present invention.

2A is a circuit diagram of a touch sensor according to a first embodiment of the present invention.

FIG. 2B is a schematic diagram showing a circuit for generating an inductive signal when the touch sensor is pressed according to the first embodiment of the present invention.

FIG. 3A is a schematic diagram showing that the touch sensor of FIG. 1C is applied to a touch type liquid crystal display panel.

Fig. 3B is a cross-sectional view showing the touch type liquid crystal display panel according to the section line AA' in Fig. 3A.

4 is a circuit diagram of a touch-type liquid crystal display panel according to a second embodiment of the present invention.

FIG. 5 is a schematic circuit diagram of a touch-type liquid crystal display panel according to a third embodiment of the present invention.

FIG. 6 is a schematic circuit diagram of a touch-type liquid crystal display panel according to a fourth embodiment of the present invention.

FIG. 7 is a schematic circuit diagram of a touch-type liquid crystal display panel according to a fifth embodiment of the present invention.

FIG. 8 is a diagram showing a touch-type liquid crystal display according to a sixth embodiment of the present invention. Schematic diagram of the circuit board of the display panel.

Figure 9 is a circuit diagram of a touch-type liquid crystal display panel in accordance with a seventh embodiment of the present invention.

Figure 10 is a circuit diagram of a touch-type liquid crystal display panel in accordance with an eighth embodiment of the present invention.

FIG. 11A is a schematic diagram showing an example of a touch display module applied to an embodiment of the present invention.

FIG. 11B is a schematic diagram showing another example of a touch display module applied to an embodiment of the present invention.

12 to 16 are diagrams each showing an example of a circuit diagram of a read circuit of the touch display module according to the embodiment of the present invention.

110‧‧‧Touch sensor

120‧‧‧First substrate

130‧‧‧second substrate

140‧‧‧Induction electrodes

150‧‧‧Inductive switching components

151‧‧‧First switch electrode

152‧‧‧Second switch electrode

153‧‧‧ active layer

D1‧‧‧ spacing

Claims (26)

A touch display panel includes: a first substrate; a second substrate disposed opposite to the first substrate; a pixel array disposed between the first substrate and the second substrate; and a plurality of contacts Each of the touch sensors includes: an inductive electrode on the first substrate; and an inductive switching element on the second substrate, the inductive switching element includes: a first switch electrode And a second switching electrode; an active layer is disposed between the first switching electrode and the second switching electrode, and is in contact with the first switching electrode and the second switching electrode, the active layer and the sensing The electrodes are opposite and spaced apart from each other; a dielectric layer, wherein the active layer, the first switch electrode and the second switch electrode are over the dielectric layer; and a light shielding layer is located on the second substrate and the dielectric layer Between the electrical layers, and opposite to the active layer; wherein when the first substrate or the second substrate is pressed to change the spacing between the sensing electrode and the active layer, the driven sensing electrode is in the Corresponding to the active layer a channel, wherein the first switch electrode and the second switch electrode are turned on, and when at least one of the first switch electrode and the second switch electrode is driven, the first switch electrode and the second switch electrode are A corresponding sensing signal is generated between; The sensing electrode is configured to receive a first signal and be driven. The touch display panel of claim 1, wherein the first switch electrode and the second switch electrode are located on both sides of the active layer and cover a portion of the active layer. The touch display panel of claim 1, wherein the first signal is a voltage signal. The touch display panel of claim 3, wherein the first signal is a common voltage, wherein the common voltage is used to drive the pixel array. The touch display panel of claim 1, wherein the first switch electrode is configured to receive a second signal to be driven. The touch display panel of claim 5, wherein the second switch electrode is configured to output the sensing signal. The touch display panel of claim 5, wherein the second signal is a voltage signal. The touch display panel of claim 5, wherein the second signal is generated by a gate driver. The touch display panel of claim 8, wherein the second signal is a scanning signal for driving one of the pixel arrays. The touch-sensitive display panel of claim 9, wherein the touch sensors that receive the second signal are disposed adjacent to the touch panel The column of the pixel array. The touch-sensitive display panel of claim 1, wherein the light-shielding layer has a light-shielding structure layer of an insulating material. The touch-sensitive display panel of claim 1, wherein the light-shielding layer has one of the metal material control electrodes. The touch-sensitive display panel of claim 12, wherein the control electrode is vacant. The touch-sensitive display panel of claim 12, wherein the control electrode is configured to receive a fourth signal to be driven. The touch display panel of claim 14, wherein the fourth signal is a voltage signal. The touch display panel of claim 12, wherein the control electrode is electrically connected to one of the first switch electrode and the second switch electrode. A touch display module includes: a touch display panel, comprising: a first substrate and a second substrate disposed oppositely, a pixel array disposed between the first substrate and the second substrate, and a plurality of touch sensors, each of the touch sensors comprising: an inductive electrode on the first substrate; and an inductive switching element on the second substrate, the inductive switching element comprising: a first a switching electrode and a second switching electrode; an active layer disposed on the first switching electrode and the The second switching electrode is in contact with the first switching electrode and the second switching electrode, and the active layer is opposite to the sensing electrode and spaced apart from each other; a dielectric layer, wherein the active layer and the first switch The electrode and the second switch electrode are disposed on the dielectric layer; and a light shielding layer is disposed between the second substrate and the dielectric layer and opposite to the active layer, wherein the first substrate or the When the second substrate is pressed to change the spacing between the sensing electrode and the active layer, the driven sensing electrode induces a corresponding channel on the active layer, so that the first switching electrode and the second The switch electrode is turned on, and when at least one of the first switch electrode and the second switch electrode is driven, a corresponding sensing signal is generated between the first switch electrode and the second switch electrode; and a read The circuit is configured to receive the sensing signal of at least one of the touch sensors, the sensing signal is a current signal, and the reading circuit is configured to convert the current signal into an output signal. The touch display module of claim 17, further comprising: a positioning circuit for positioning the touch display panel to be touched according to the output signal. The touch display module of claim 18, further comprising: a gate driver for generating a scan signal for driving one of the pixel arrays; wherein the touch sensors One of the columns is used to receive the scan signal The touch sensors are driven to receive the column of the scan signal, and the touch sensors are disposed adjacent to the column of the pixel array; wherein the positioning circuit is further configured to determine the generation according to the scan signal Whether the touch sensor of the sensing signal is the touch sensor of the column, and determining, according to the sensing signal, the position of the touch sensor touched to locate the touch type The position where the display panel is touched. The touch display module of claim 19, further comprising: a touch control circuit for providing at least one voltage signal to drive the touch display panel. The touch-sensitive display module of claim 17, wherein the one of the touch sensors receives a scan signal for being driven, and the scan signal is used to drive one of the pixel arrays. The read circuit receives the sensing signal from the touch sensors of a row to output the output signal, and the touch display module further includes: a positioning circuit, according to at least the scan signal and the output signal, It is used to locate the position where the touch display panel is touched. The touch-sensitive display module of claim 17, wherein the read circuit comprises: a current-to-voltage amplifier for converting the current signal to a first voltage signal, wherein the read circuit is The first voltage signal is used as the output signal. The touch display module of claim 17, wherein the read circuit comprises: a current-to-voltage amplifier for converting the current signal into a first voltage signal; and a comparison amplifier for comparing the first voltage signal with a reference voltage to output a second voltage signal, the reading circuit The second voltage signal is used as the output signal. The touch-sensitive display module of claim 17, wherein the read circuit comprises: a current-to-voltage amplifier for converting the current signal into a first voltage signal; and an inverting amplifier for Inverting and amplifying the first voltage signal to be a second voltage signal; and comparing amplifiers for comparing the second voltage signal with a reference voltage to output a third voltage signal, the reading circuit is the third The voltage signal is used as the output signal. The touch-sensitive display module of claim 17, wherein the read circuit comprises: a current-to-voltage amplifier for converting the current signal into a first voltage signal; and an analog-to-digital converter, The first voltage signal used to convert analog is a digital voltage signal, and the reading circuit uses the digital voltage signal as the output signal. The touch display module of claim 17, wherein the read circuit comprises: a current to voltage amplifier for converting the current signal to a first a voltage signal; an inverting amplifier for inverting and amplifying the first voltage signal to be a second voltage signal; and an analog-to-digital converter for converting the analogous second voltage signal to a digital voltage signal, the reading The circuit takes the digital voltage signal as the output signal.