1. A screen sensing module having a plurality of sensing units arranged in an array, the sensing units comprising:

a second transistor; and

a capacitor;

wherein one of the two transistors is electrically connected to the other of the two transistors and the capacitor; and

one of the two transistors is configured to have a photosensitive layer, so that the capacitor changes a capacitance state in response to laser light irradiating the photosensitive layer and a charged body adjacent to the capacitor.

2. The screen sensing module of claim 1, wherein the sensing unit comprises:

a substrate;

a metal layer patterned on the substrate into a gate of a phototransistor, a gate of a switch transistor, and a first electrode of the capacitor;

an insulating layer disposed on the metal layer and the substrate;

a semiconductor layer patterned on the insulating layer to form the photosensitive layer of the photosensitive transistor and an active layer of the switching transistor, wherein the active layer of the switching transistor is aligned with the gate of the switching transistor, and the photosensitive layer of the photosensitive transistor is aligned with the gate of the photosensitive transistor;

a conductive layer patterned on the photosensitive layer of the phototransistor into a source and a drain of the phototransistor, patterned on the active layer of the switching transistor into a source and a drain of the switching transistor, and patterned on the insulating layer into a second electrode of the capacitor, the second electrode being disposed opposite to the first electrode; and

and the passivation layer is arranged on the insulating layer, the semiconductor layer and the conducting layer.

3. The screen sensing module of claim 2, wherein one of the source and the drain of the photosensing transistor is electrically connected to the second electrode, and the other of the source and the drain of the photosensing transistor is electrically connected to one of the source and the drain of the switching transistor.

4. The screen sensing module of claim 3, wherein the passivation layer is provided with a light shielding unit, and the light shielding unit is aligned with the active layer of the switching transistor.

5. The screen sensing module of claim 4, further comprising a light-transmissive protective layer disposed on the passivation layer and the light blocking unit.

6. The screen sensing module of claim 2, wherein one of the source and the drain of the switching transistor is electrically connected to the second electrode, and the other of the source and the drain of the switching transistor is electrically connected to one of the source and the drain of the photosensing transistor.

7. The screen sensing module of claim 6, wherein a projected extent of the photosensitive layer of the photosensitive transistor on the passivation layer is greater than a projected extent of the gate of the photosensitive transistor on the passivation layer.

8. The screen sensor module of claim 6, wherein the passivation layer is provided with two light shielding units, and the two light shielding units are aligned with the photosensitive layer of the photosensitive transistor and the active layer of the switching transistor.

9. The screen sensing module of claim 2, wherein the second electrode has a salient pole portion that protrudes away from the first electrode.

10. A display device characterized by comprising the screen sensing module according to any one of claims 1 to 9.

Background

The touch display equipment has the functions of display and man-machine interaction, can feed back the control will of a user to a screen in real time, and gradually becomes an important product for research and development and production.

In a large-sized display screen, an operator needs to be close to the touch screen in order to realize a touch function, resulting in difficulty in realizing full-screen touch or observation. In the past, although some control technologies combining physical (e.g., finger or pen) touch control and laser sensing, such as camera shooting or timing control, have been adopted, many problems, such as low accuracy, poor efficiency, and complicated control, are still to be improved.

Therefore, a solution is provided to solve the problems of the prior art.

Disclosure of Invention

The invention provides a display device and a screen sensing module thereof, which are used for solving the problems of low precision, poor efficiency, complex control and the like in the existing display touch technology.

To solve the above problem, a first aspect of the present invention provides a screen sensing module having a plurality of sensing units arranged in an array, the sensing units comprising: a second transistor; and a capacitor; wherein one of the two transistors is electrically connected to the other of the two transistors and the capacitor; and one of the two transistors is configured to have a photosensitive layer, so that the capacitor changes a capacitance state in response to laser light irradiating the photosensitive layer and a charged body adjacent to the capacitor.

According to an embodiment of the present invention, the sensing unit includes: a substrate; a metal layer patterned on the substrate into a gate of a phototransistor, a gate of a switch transistor, and a first electrode of the capacitor; an insulating layer disposed on the metal layer and the substrate; a semiconductor layer patterned on the insulating layer to form the photosensitive layer of the photosensitive transistor and an active layer of the switching transistor, wherein the active layer of the switching transistor is aligned with the gate of the switching transistor, and the photosensitive layer of the photosensitive transistor is aligned with the gate of the photosensitive transistor; a conductive layer patterned on the photosensitive layer of the phototransistor into a source and a drain of the phototransistor, patterned on the active layer of the switching transistor into a source and a drain of the switching transistor, and patterned on the insulating layer into a second electrode of the capacitor, the second electrode being disposed opposite to the first electrode; and a passivation layer disposed on the insulating layer, the semiconductor layer and the conductive layer.

According to an embodiment of the present invention, one of the source and the drain of the light sensing transistor is electrically connected to the second electrode, and the other of the source and the drain of the light sensing transistor is electrically connected to one of the source and the drain of the switching transistor.

According to an embodiment of the present invention, the passivation layer is provided with a light shielding unit, and the light shielding unit is aligned with the active layer of the switching transistor.

According to an embodiment of the present invention, the screen sensing module further includes a light-transmitting protective layer disposed on the passivation layer and the light-shielding unit.

According to an embodiment of the present invention, one of the source and the drain of the switching transistor is electrically connected to the second electrode, and the other of the source and the drain of the switching transistor is electrically connected to one of the source and the drain of the light sensing transistor.

According to an embodiment of the present invention, a projection range of the photosensitive layer of the photosensitive transistor on the passivation layer is larger than a projection range of the gate of the photosensitive transistor on the passivation layer.

According to an embodiment of the present invention, the passivation layer is provided with two light shielding units, and the two light shielding units are disposed opposite to the photosensitive layer of the photosensitive transistor and the active layer of the switching transistor.

According to an embodiment of the present invention, the second electrode has a salient pole portion protruding toward a direction away from the first electrode.

To solve the above problems, a second aspect of the present invention provides a display device, comprising: the screen sensing module as described above.

The display device and the screen sensing module thereof have a plurality of sensing units arranged in an array, wherein each sensing unit comprises two transistors and a capacitor, one transistor in the two transistors is electrically connected with the other transistor in the two transistors and the capacitor, one transistor in the two transistors is configured to have a photosensitive layer, and the capacitor changes the capacitance state in response to laser irradiating the photosensitive layer and charged bodies adjacent to the capacitor. The position information of the finger or the laser pointing to the screen sensing module can be obtained by scanning and detecting the capacitance change conditions of different sensing units in the screen sensing module. Therefore, the position sensing function of the finger touch screen or the laser pointing screen can be achieved without additionally adopting a time-sharing driving mechanism. Compared with other time-sharing driving technologies based on time sequence control, the display device and the screen sensing module thereof can achieve the beneficial effects of simplifying the driving scheme, improving the identification efficiency and the like; compared with other indirect driving technologies based on camera control, the display device and the screen sensing module thereof disclosed by the invention can achieve the beneficial effects of simplifying a control scheme, improving the precision and the like, and are beneficial to improving the industrial technical level.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1 is a schematic circuit diagram of a screen sensing module according to an embodiment of the present invention;

FIG. 2 is a schematic cross-sectional view illustrating a sensing unit in a screen sensing module according to an embodiment of the invention;

FIG. 3 is a schematic cross-sectional view of a display device according to an embodiment of the invention; and

fig. 4 is a schematic cross-sectional view of a display device according to another embodiment of the invention.

Detailed Description

The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description herein, it will be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," and the like are used in the orientations and positional relationships indicated in the drawings to facilitate the description of the invention and to simplify the description, but do not indicate or imply that the device or element being referred to has a particular orientation, is constructed and operates in a particular orientation, and is not therefore to be considered limiting.

In the description herein, it is to be understood that the terms "first", "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

Many different embodiments or examples are provided herein to implement different configurations of the present invention. To simplify the present disclosure, certain exemplary components and arrangements are described below. Of course, they are merely examples and are not intended to limit the present invention. Furthermore, the present invention may repeat reference numerals and/or letters in the various examples, such repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. Additionally, examples of various specific processes and materials are provided herein, but one of ordinary skill in the art may recognize applications of other processes and/or use of other materials.

The embodiment of the invention provides a display device and a screen sensing module thereof. The following are detailed below.

In one aspect, embodiments of the present invention provide a screen sensing module, which can be suitably disposed in the display device described herein, for providing manipulation position information of a finger and a laser directed to a display panel.

As shown in fig. 1, a screen sensing module according to an embodiment of the present invention has a plurality of sensing units arranged in an array, and the sensing units include: two transistors T1, T2 and a capacitor C, one of the transistors T1, T2 (e.g., transistor T1) electrically connects the other of the transistors T1, T2 (e.g., transistor T2) and the capacitor C, one of the transistors T1, T2 is configured to have a photosensitive layer, such that the capacitor C changes capacitance state in response to laser light irradiating the photosensitive layer and charged bodies adjacent to the capacitor C.

As shown in fig. 1, the transistors T1, T2 described herein may be transistors suitable for a display panel, such as Thin Film Transistors (TFTs), which may be bottom gate thin film transistors or the like, having a gate electrode, a source electrode and a drain electrode.

As shown in fig. 1, the gate of the transistor T1 is electrically connected to a gate voltage V1, one of the source and the drain of the transistor T1 is electrically connected to one end of the capacitor C, the other of the source and the drain of the transistor T1 is electrically connected to one of the source and the drain of the transistor T2, the other of the source and the drain of the transistor T2 is electrically connected to a positive voltage V2, such as 0 to +15 volts (V), the gate of the transistor T2 is electrically connected to a negative voltage V3, such as-10 to 0 volts (V), and the capacitor C changes capacitance state in response to the laser irradiating one of the transistors T1 and T2, such as the transistor T1, and the charged body F adjacent to the capacitor C.

In an embodiment, as shown in fig. 2, taking a bottom-gate thin film transistor as an example, the sensing unit includes: a substrate N1, a metal layer N2, an insulating layer N3, a semiconductor layer N4, a conductive layer N5 and a passivation layer N6. Fig. 2 (a) to (e) show an exemplary preparation scheme, which is exemplified as follows.

In fig. 2, as shown at (a), the substrate N1 may be, for example, a glass substrate; the metal layer N2 is patterned on the substrate N1 into a gate G of a phototransistor T1 (as shown at (e)), a gate G of a switching transistor T2 (as shown at (e)), and a first electrode C1 of the capacitor C, and the metal layer N2 may be prepared, for example, from an M1 metal material, such as a metal material like copper or aluminum, for example, by a specific mask design, for example, by Physical Vapor Deposition (PVD) for film formation, and then patterned by a wet etching process.

In fig. 2, as shown at (b), the insulating layer N3 is disposed on the metal layer N2 and the substrate N1, such as the insulating layer N3 covering the gate G of the light sensing transistor T1, the gate G of the switching transistor T2, the first electrode C1 of the capacitor C and the substrate N1, the insulating layer N3 may be made of, for example, a GI insulating layer material, such as by a specific mask design, such as by Chemical Vapor Deposition (CVD).

In fig. 2, as shown at (c), the semiconductor layer N4 may be prepared, for example, by using an active semiconductor material, such as amorphous silicon (a-Si), etc., the semiconductor layer N4 is patterned on the insulating layer N3 into a photosensitive layer a1 of the phototransistor T1 and an active layer a2 of the switching transistor T2, for example, by a specific mask design, the active layer a2 of the switching transistor T2 is aligned with the gate G of the switching transistor T2, and the photosensitive layer a1 of the phototransistor a1 is aligned with the gate G of the phototransistor a 1; the photosensitive layer a1 may be made of, for example, a semiconductor material having photosensitive characteristics such as amorphous silicon (a-Si) for changing the electrical characteristics of the phototransistor T1 in response to laser light, such as a current state, but not limited thereto, for example, the photosensitive layer a1 may be made of an organic molecule or a polymer semiconductor capable of generating a photocurrent, or a metal oxide semiconductor capable of sensing a specific wavelength of a laser pen.

In fig. 2, as shown at (d), the conductive layer N5 is patterned on the photosensitive layer a1 of the photo transistor T1 into a source and a drain of the photo transistor T1, on the active layer a2 of the switching transistor T2 into a source and a drain of the switching transistor T2, and on the insulating layer N3 into a second electrode C2 of the capacitor C, the second electrode C2 being disposed in alignment with the first electrode C1, one of the source and the drain of the photo transistor T1 being electrically connected to the second electrode C2, the other of the source and the drain of the photo transistor T1 being electrically connected to one of the source and the drain of the switching transistor T2, the conductive layer N5 may be made of a metal material such as copper or aluminum, such as by a specific mask design, for example, PVD is used for film formation, and then, patterning is performed by wet etching. The conductive material for electrical connection may be a transparent conductive material, such as Indium Tin Oxide (ITO), and it is understood that the holes required for electrical connection may be formed by a dry etching process.

Alternatively, in an embodiment, as shown in fig. 2, the second electrode C2 may have a salient pole portion C21, the salient pole portion C21 protruding away from the first electrode C1. Therefore, when an external charged body is adjacent, the touch control device can assist in improving the charge induction capability and improving the sensitivity of charge induction, and is favorable for improving the touch control effect.

In fig. 2, as shown at (e), the passivation layer N6 is disposed on the insulating layer N3, the semiconductor layer N4 and the conductive layer N5, such as the passivation layer N6 covering the source electrode, the drain electrode, the active layer and the insulating layer N3, prepared by, for example, a specific mask design, such as film formation using CVD, thereby forming specific configurations of the phototransistor T1, the switching transistor T2 and the capacitor C.

As shown in fig. 3, the capacitor C may change a capacitance state in response to a laser L irradiating the photosensitive layer a1 of the photosensitive transistor T1 and a charged body F adjacent to the capacitor C, which may be a finger, a touch pen, or the like, and the laser L may be various colors of light from the laser pen, for example, as follows.

Optionally, in an embodiment, as shown in fig. 3, the passivation layer N6 of the screen sensing module may further include a light shielding unit B, such as a Black Matrix (BM) photo-resistor, disposed opposite to the active layer of the switching transistor T2, for blocking laser L from irradiating the active layer of the switching transistor T2.

Optionally, in an embodiment, as shown in fig. 3, the screen sensing module further includes a light-transmissive protection layer P, such as glass, disposed on the passivation layer N6 and the light shielding unit B for protecting the material layers inside the screen sensing module.

The screen sensing module of the present invention may be configured in a display device, such as another aspect of the present invention provides a display device, and the screen sensing module may be configured to be externally hung on a display panel.

Alternatively, in an embodiment, as shown in fig. 3, the display device includes a screen sensing module U and a display part Y, the screen sensing module U has a plurality of sensing units arranged in an array, which is only an example, but not limited thereto, and the sensing units include: two transistors (such as the light sensing transistor T1 and the switch transistor T2) and a capacitor C. Such as a substrate N1, a metal layer N2, an insulating layer N3, a semiconductor layer N4, a conductive layer N5 and a passivation layer N6 (the same structure as shown in fig. 2); the display part Y is, for example, a flat display module such as a Liquid Crystal Display (LCD) module or an Organic Light Emitting Diode (OLED) module. Taking a liquid crystal display module as an example, the display part Y has a light source side Y1 (such as a TFT glass array substrate) and a display side Y2 (such as a color filter glass substrate), a liquid crystal material may be disposed between the display side Y2 and the light source side Y1, and a light source H (such as from a cold cathode fluorescent lamp or the like) of the display part Y irradiates from the light source side Y1 to the display side Y2, so that the display side Y2 presents different images.

In one embodiment, as shown in fig. 3, a sealing layer E may be further attached between the display side Y2 of the display part Y and the substrate N1 of the screen sensing module U for enhancing the sealing and bonding performance between the display part Y and the screen sensing module U.

For example, as shown in fig. 3, when a charged object (e.g., a finger) F is adjacent to or touches a position of the light-transmissive protective layer P near the capacitor C, charge accumulation is induced, such that capacitance between the first electrode C1 and the second electrode C2 of the capacitor C is changed for positioning according to touch. In addition, when the laser L (e.g. from a laser pen) irradiates the photosensitive layer a1 of the phototransistor T1, the phototransistor T1 generates a current change in the photosensitive layer a1 between the source and the drain, e.g. a current leakage phenomenon occurs, so that the capacitance between the first electrode C1 and the second electrode C2 of the capacitor C changes, which is used as a basis for laser positioning. Correspondingly, the capacitance change conditions of different sensing units in the screen sensing module U can be scanned and detected in cooperation with a related touch scanning chip, and the capacitance change conditions can be used as position information of the sensing finger F or the laser L pointing to the screen sensing module.

Alternatively, in an embodiment, the screen sensing module of the present invention may be configured to be built in the display panel (as shown in fig. 4).

Alternatively, in an embodiment, as shown in fig. 4, the display device includes a screen sensing module U 'and a display part Y'. The screen sensing module U' has a plurality of sensing units arranged in an array, and herein, only one sensing unit is taken as an example, but not limited thereto, and the sensing unit includes: a substrate N1 ', a metal layer, an insulating layer, a semiconductor layer, a conductive layer and a passivation layer N6 ' (the screen sensor module U ' in fig. 4 is similar in structure to the screen sensor module U in fig. 3, but arranged in the opposite direction), and the materials and processes thereof can be referred to above. The difference between this embodiment and the previous embodiment is, for example, the difference between the forms of the photosensitive layer and the position of the phototransistor, and only some reference numerals are shown below for explaining the difference.

As shown in fig. 4, taking the lcd module as an example, the display component Y 'has a light source side Y1' (such as a color filter glass substrate), the display component Y 'can be combined with the passivation layer N6' of the screen sensor module U 'to serve as a display side, a liquid crystal material is disposed between the display side and the light source side Y1', and a light source H (such as from a cold cathode fluorescent lamp or the like) of the display component Y 'can irradiate from the light source side Y1' toward the display side, so that the display side presents different images.

In one embodiment, as shown in fig. 4, the passivation layer N6 ' is provided with two light-shielding units B1 and B2, and the two light-shielding units B1 and B2 are aligned with the photosensitive layer a1 ' of the light-sensing transistor T1 ' and the active layer a2 ' of the switching transistor T2 '. Accordingly, the light source H from the light source side Y1 ' can be properly blocked from irradiating the photosensitive layer a1 ' of the photosensitive transistor T1 ', the active layer a2 ' of the switching transistor T2 ', and the photosensitive transistor T1 ' and the switching transistor T2 ' are prevented from being affected.

Alternatively, in an embodiment, as shown in fig. 4, a projection range of the photosensitive layer a1 ' of the photo transistor T1 ' on the passivation layer N6 ' is larger than a projection range of the gate G ' of the photo transistor T1 ' on the passivation layer N6 ', such as in a specific longitudinal cross section (as shown in fig. 4), the photosensitive layer a1 ' extends along a lateral direction, so that a width of the photosensitive layer a1 ' is larger than a width of the gate G '. Accordingly, it is possible to prevent the laser light L from being blocked by the gate G 'of the photo transistor T1'.

For example, as shown in fig. 4, in the same sensing unit of the screen sensing module U ', when a charged object (e.g. a finger) F is adjacent to or touches a position of the substrate N1' near the corresponding capacitor C ', a charge accumulation is induced, such that a capacitance between the first electrode and the second electrode of the capacitor C' is changed for serving as a basis for touch location. In addition, when the laser L irradiates the photosensitive layer of the phototransistor T1 ', the phototransistor T1' generates a current change, such as a current leakage phenomenon, in the active layer a1 'between the source and the drain, so that the capacitance between the first electrode and the second electrode of the capacitor C' is changed for serving as a basis for laser positioning. Correspondingly, the capacitance change conditions of different sensing units in the screen sensing module U' can be scanned and detected in cooperation with a related touch scanning chip, and the capacitance change conditions can be used as position information for detecting that the finger F or the laser L points to the screen sensing module.

The display device and the screen sensing module thereof according to the above embodiments of the present invention have a plurality of sensing units arranged in an array, the sensing unit includes two transistors and a capacitor, one of the two transistors is electrically connected to the other of the two transistors and the capacitor, and one of the two transistors is configured to have a photosensitive layer, so that the capacitor changes a capacitance state in response to laser light irradiating the photosensitive layer and a charged body adjacent to the capacitor. The position information of the finger or the laser pointing to the screen sensing module can be obtained by scanning and detecting the capacitance change conditions of different sensing units in the screen sensing module. Therefore, the position sensing function of the finger touch screen or the laser pointing screen can be achieved without additionally adopting a time-sharing driving mechanism.

Compared with other time-sharing driving technologies based on time sequence control, the display device and the screen sensing module thereof in the embodiment of the invention can achieve the beneficial effects of simplifying the driving scheme, improving the recognition efficiency and the like; compared with other indirect driving technologies based on camera control, the display device and the screen sensing module thereof in the embodiment of the invention can achieve the beneficial effects of simplifying a control scheme, improving the precision and the like, and are beneficial to improving the industrial technical level.

The embodiments of the present invention are described in detail above, and the principle and the implementation of the present invention are explained in the present document by using specific embodiments, and the description of the embodiments is only used to help understanding the technical scheme and the core idea of the present invention; those of ordinary skill in the art will understand that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.