Touch display device and electronic device

Abstract

A touch display device and an electronic device, the touch display device comprising a first substrate, a second substrate, a functional layer, a photosensitive layer and a touch layer, the second substrate being arranged opposite to the first substrate, the functional layer being arranged between the first substrate and the second substrate, the photosensitive layer being arranged between the first substrate and the functional layer, the photosensitive layer comprising a photosensitive portion, the photosensitive portion being used to receive light and generate a touch signal, the touch layer being arranged on a side of the first substrate facing away from the second substrate, the touch layer comprising a touch portion, the touch portion and the photosensitive portion being arranged correspondingly, when the touch portion is not subjected to touch pressure, light is totally reflected in the touch portion, when the touch portion is subjected to touch pressure, the touch portion is elastically deformed, light is refracted in the touch portion and incident on the photosensitive portion, thereby improving the touch recognition accuracy and integration of the touch display device.

Description

Technical Field

[0001] The present invention relates to the technical field of touch display panels, and in particular to a touch display device and an electronic device. Background Art

[0002] In modern society, display devices with touch functions have become an indispensable part of many electronic devices, providing users with an intuitive and convenient interactive experience. The screen touch devices in the prior art usually use external technology to realize the touch function, which has the problems of low touch recognition accuracy and low integration. Summary of the invention

[0003] The purpose of the present invention is to provide a touch display device and an electronic device, which solve the problems of low touch recognition accuracy and low integration.

[0004] To achieve the purpose of the present invention, the present invention provides the following technical solutions:

[0005] In a first aspect, the present invention provides a touch display device, comprising: a first substrate; a second substrate, arranged opposite to the first substrate; a functional layer, arranged between the first substrate and the second substrate; a photosensitive layer, arranged between the first substrate and the functional layer, the photosensitive layer comprising a photosensitive portion, the photosensitive portion being used to receive light and generate a touch signal; a touch layer, arranged on a side of the first substrate facing away from the second substrate, the touch layer comprising a touch portion, the touch portion being arranged corresponding to the photosensitive portion; when the touch portion is not subjected to touch pressure, light is totally reflected in the touch portion; when the touch portion is subjected to touch pressure, the touch portion undergoes elastic deformation, and light is refracted in the touch portion and incident on the photosensitive portion.

[0006] In one embodiment, the touch layer also includes a touch panel, which is arranged opposite to the first substrate, and the touch portion is arranged on a surface of the touch panel facing the first substrate, and light enters the touch portion from the touch panel. When the touch panel is subjected to touch pressure, the touch panel deforms and squeezes the touch portion to cause the touch portion to deform elastically.

[0007] In one embodiment, in a cross section of the touch layer, a contour shape of the touch portion is an arc protruding from the touch panel toward one side of the first substrate.

[0008] In one embodiment, the photosensitive portion is a photosensitive thin film transistor, the functional layer includes a gate layer and a display thin film transistor, the gate layer is arranged on the side of the photosensitive layer facing away from the first substrate, and the display thin film transistor is arranged on the side of the gate layer facing away from the photosensitive layer, and the gate of the photosensitive thin film transistor and the gate of the display thin film transistor are both electrically connected to the gate layer.

[0009] In one embodiment, the photosensitive thin film transistor, the display thin film transistor and the touch control unit are all arranged in an array, and the multiple display thin film transistors and the multiple touch control units are arranged in a one-to-one correspondence with the multiple photosensitive thin film transistors; the photosensitive layer also includes a plurality of detection lines, and each of the detection lines is electrically connected to the drain of at least one of the photosensitive thin film transistors.

[0010] In one embodiment, the drain electrodes of the plurality of photosensitive thin film transistors in the same column are all electrically connected to the same detection line; or, the drain electrodes of the photosensitive thin film transistors in the same row are all electrically connected to the same detection line.

[0011] In one embodiment, the touch display device further includes a light source, and the light source is used to emit light to the touch layer.

[0012] In one embodiment, the functional layer also includes a color resist layer and a liquid crystal layer, the color resist layer is arranged on the surface of the second substrate facing the first substrate, and the liquid crystal layer is arranged on the side of the color resist layer facing away from the second substrate; the touch display device also includes a light guide plate, and the light guide plate is arranged on the side of the second substrate facing away from the first substrate; the light source includes a first light source and a second light source, the first light source is connected to the light guide plate, and the second light source is connected to the touch layer; or, the touch display device also includes a first light guide plate and a second light guide plate, the first light guide plate is arranged on the surface of the second substrate facing away from the first substrate, one end of the second light guide plate is connected to the first light guide plate, and the other end is connected to the touch layer, and the light source is connected to the first light guide plate or the second light guide plate.

[0013] In one embodiment, the touch display device further includes a transparent conductive layer, wherein the transparent conductive layer is disposed between the first substrate and the touch layer, and the transparent conductive layer is used to isolate external static electricity.

[0014] In a second aspect, the present invention further provides an electronic device, comprising a housing and a touch display device according to any one of the various embodiments of the first aspect, wherein the touch display device is accommodated in the housing.

[0015] A photosensitive layer is arranged between the first substrate and the functional layer, the photosensitive layer includes a photosensitive portion, the photosensitive portion is used to receive light and generate a touch signal, a touch layer is arranged on the side of the first substrate facing away from the second substrate, the touch layer includes a touch portion, the touch portion and the photosensitive portion are arranged correspondingly, when the touch portion is not subjected to touch pressure, the light is totally reflected in the touch portion, when the touch portion is subjected to touch pressure, the touch portion is elastically deformed, the light is refracted in the touch portion and incident on the photosensitive portion, so that the touch display device can recognize the touch position by receiving the refracted light generated when the touch portion is subjected to touch pressure through the photosensitive portion arranged between the first substrate and the functional layer, thereby improving the touch recognition accuracy and integration of the touch display device. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 is a schematic diagram of an electronic device of an embodiment;

[0018] Figure 2 is a partial cross-sectional view of a touch display device of an embodiment when it is not touched;

[0019] Figure 3 is a partial cross-sectional view of a touch display device of an embodiment when being touched;

[0020] Figure 4 is a partial top view A of a touch display device according to an embodiment;

[0021] Figure 5 is a partial top view B of a touch display device according to an embodiment;

[0022] Figure 6 is a partial cross-sectional view of a touch display device according to another embodiment including a first light source and a second light source;

[0023] Figure 7 It is a partial cross-sectional view of a touch display device according to another embodiment including a first light source.

[0024] Description of reference numerals:

[0025] 1000-Electronic equipment;

[0026] 100-touch display device;

[0027] 10- a first substrate;

[0028] 20- a second substrate;

[0029] 30-functional layer, 31-gate layer, 32-display thin film transistor, 33-color resist layer, 331-light shielding part, 332-light filtering part, 34-liquid crystal layer, 35-insulating layer;

[0030] 40-photosensitive layer, 41-photosensitive part;

[0031] 50-touch layer, 51-touch portion, 52-touch panel;

[0032] 60-light source, 61-first light source, 62-second light source;

[0033] 70-light guide plate, 71-first light guide plate, 72-second light guide plate;

[0034] 80-transparent conductive layer;

[0035] Gn-scanning line, L1-photosensitive data line, L2-display data line, L3-detection line;

[0036] 200-Housing. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] It should be noted that when a component is said to be "fixed to" another component, it can be directly on the other component or there can be a central component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there can be a central component at the same time.

[0039] Unless otherwise defined, all technical and scientific terms used in the present invention have the same meaning as those commonly understood by those skilled in the art to which the present invention belongs. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used in the present invention includes any and all combinations of one or more of the related listed items.

[0040] Some embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0041] Please refer to Figure 1The present invention provides an electronic device 1000, including a housing 200 and a touch display device 100 in an embodiment of the present invention, and the touch display device 100 is accommodated in the housing 200. The electronic device 1000 can be an e-reader, an e-book, a touch display, a mobile phone, etc., without limitation. The electronic device 1000 provided by the present invention, by adopting the housing 200 and the touch display device 100 in an embodiment of the present invention, the touch display device 100 is accommodated in the housing 200, so as to realize the display and touch functions of the electronic device 1000, and improve the touch recognition accuracy and integration of the touch display device 100.

[0042] Please refer to Figure 2 and Figure 3 The present invention further provides a touch display device 100, comprising a first substrate 10, a second substrate 20, a functional layer 30, a photosensitive layer 40 and a touch layer 50. The second substrate 20 is arranged opposite to the first substrate 10, the functional layer 30 is arranged between the first substrate 10 and the second substrate 20, the photosensitive layer 40 is arranged between the first substrate 10 and the functional layer 30, the photosensitive layer 40 comprises a photosensitive portion 41, the photosensitive portion 41 is used to receive light and generate a touch signal, the touch layer 50 is arranged on the side of the first substrate 10 facing away from the second substrate 20, the touch layer 50 comprises a touch portion 51, the touch portion 51 is arranged corresponding to the photosensitive portion 41, when the touch portion 51 is not subjected to touch pressure, the light is totally reflected in the touch portion 51, when the touch portion 51 is subjected to touch pressure, the touch portion 51 is elastically deformed, the light is refracted in the touch portion 51 and incident into the photosensitive portion 41.

[0043] Optionally, the first substrate 10 may be composed of materials such as glass and quartz and other structures on the substrate (for example, a buffer layer). Exemplarily, the first substrate 10 is made of a glass material with a low thermal expansion coefficient, low density and high chemical stability to ensure that the deformation and warping of the substrate during processing and use are smaller, and at the same time, when subjected to corrosion by various acidic and alkaline chemicals or gases, it is not easy to cause changes in the appearance of material decomposition. Optionally, the thickness of the first substrate 10 may be 0.3mm (millimeter)-0.7mm, specifically 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, etc., without limitation. Optionally, the material of the second substrate 20 is similar to that of the first substrate 10, which can be referred to and will not be repeated.

[0044] Optionally, the touch layer 50 is made of a highly light-transmitting resin material, so that the touch layer 50 can be elastically deformed in the touched area when receiving touch pressure, thereby allowing light to enter the photosensitive portion 41. Optionally, the photosensitive portion 41 can be made of a material that can generate current when receiving light, specifically cadmium telluride, copper indium gallium selenide, and graphene, etc., without limitation.

[0045] Optionally, the touch display device 100 further includes a driving chip, which is electrically connected to the photosensitive portion 41 . When the photosensitive portion 41 receives light from the touch portion 51 to generate a touch signal, the driving chip receives the touch signal to identify the touched area.

[0046] In the prior art, the touch function is usually realized by external plug-in technology. External plug-in technology is a method in which the touch screen and the display screen are independent of each other and are combined together by external connection or bonding. This touch screen usually exists as an additional component of the display screen. The low integration of this method will increase the thickness of the display screen. At the same time, since the touch screen and the display screen in the external plug-in technology need to be produced separately and then installed, it is difficult to ensure the consistency of the touch position and the display position.

[0047] In addition, the prior art generally uses In Cell technology and On Cell technology to realize the touch function. In Cell technology and On Cell technology both place the touch sensor inside the display screen, but the In Cell technology and On Cell technology in the prior art are not provided with the touch layer 50 provided by the present invention, so that the light in the non-touch area cannot be prevented from entering the touch sensor in the touch area. Although the In Cell technology and On Cell technology in the prior art have solved the problem of low integration to a certain extent, they also have the problems of low recognition accuracy and easy occurrence of touch recognition errors.

[0048] The touch display device 100 provided by the present invention is provided with a photosensitive layer 40 disposed between the first substrate 10 and the functional layer 30, the photosensitive layer 40 includes a photosensitive portion 41, the photosensitive portion 41 is used to receive light and generate a touch signal, and a touch layer 50 is disposed on the side of the first substrate 10 facing away from the second substrate 20, the touch layer 50 includes a touch portion 51, and the touch portion 51 is disposed corresponding to the photosensitive portion 41. When the touch portion 51 is not subjected to touch pressure, the light is totally reflected in the touch portion 51. When the touch portion 51 is subjected to touch pressure, the touch portion 51 is elastically deformed, and the light is refracted in the touch portion 51 and incident on the photosensitive portion 41, so that the touch display device 100 can realize the recognition of the touch position by receiving the refracted light generated by the touch portion 51 receiving the touch pressure through the photosensitive portion 41 disposed between the first substrate 10 and the functional layer 30, thereby improving the touch recognition accuracy and integration of the touch display device 100.

[0049] In addition, the touch display device 100 provided by the present invention can perform the steps of manufacturing the photosensitive layer 40 and the touch layer 50 on the functional layer during the process of manufacturing the functional layer and other structures, thereby reducing the transportation and storage links and improving the production speed.

[0050] Please refer to Figure 2 and Figure 3The touch layer 50 also includes a touch panel 52, which is arranged opposite to the first substrate 10. The touch portion 51 is arranged on the surface of the touch panel 52 facing the first substrate 10. Light enters the touch portion 51 from the touch panel 52. When the touch panel 52 is subjected to touch pressure, the touch panel 52 is deformed and squeezes the touch portion 51, so that the touch portion 51 is elastically deformed.

[0051] When the touch panel 52 receives touch pressure, the touch panel 52 and the touch portion 51 undergo only slight elastic deformation, and the touch portion 51 abuts against the first substrate 10. At this time, the contact surface between the touch portion 51 and the first substrate 10 is a plane, so that light can be irradiated into the first substrate 10 through the plane, and then the light is irradiated to the photosensitive portion 41 through the first substrate 10. Optionally, the touch panel 52 is a flat plate structure so that the surface of the touch display device 100 on the side for touch is flat and smooth. Optionally, the touch panel 52 and the touch portion 51 can be an integrated structure, or can be connected and fixed by bonding, hot melting, etc., without limitation.

[0052] By setting the touch layer 50 to also include a touch panel 52, the touch panel 52 is arranged opposite to the first substrate 10, and the touch portion 51 is arranged on the surface of the touch panel 52 facing the first substrate 10. Light enters the touch portion 51 from the touch panel 52. When the touch panel 52 is subjected to touch pressure, the touch panel 52 is deformed and squeezes the touch portion 51, so that the touch portion 51 is elastically deformed. When the user touches any position of the touch panel 52, the touch panel 52 can evenly transfer the touch pressure to the touch portion 51 in the touched area, so that the deformation of the corresponding touch portion 51 is even, ensuring that light can be refracted from the touch portion 51 in the touched area to the corresponding photosensitive portion 41, thereby improving the touch recognition accuracy of the touch display device 100.

[0053] Please refer to Figure 2 and Figure 3 In the cross section of the touch layer 50 , the contour shape of the touch portion 51 is an arc protruding from the touch panel 52 toward the first substrate 10 .

[0054] Optionally, when the touch layer 50 is not subjected to touch pressure, there may be a gap between the outer surface of the touch portion 51 and the first substrate 10, or they may be in contact, without limitation. Optionally, when the touch layer 50 is subjected to touch pressure, part of the outer surface of the touch portion 51 abuts against the first substrate 10 and forms a plane, so that the light does not undergo total reflection at the plane but is refracted to the photosensitive portion 41.

[0055] By being arranged in the cross section of the touch layer 50, the contour shape of the touch portion 51 is an arc protruding from the touch panel 52 to the side of the first substrate 10, so that when the touch layer 50 is not subjected to touch pressure, all light can be fully reflected in the touch portion 51 without the risk of light leakage. When the touch layer 50 is subjected to touch pressure, the spherical surface of the touch portion 51 can be turned into a plane under pressure without surface folding, ensuring that the light in the touch portion 51 can be irradiated to the corresponding photosensitive portion 41 without irradiating other areas, thereby improving the touch recognition accuracy of the touch display device 100.

[0056] Please refer to Figures 2 to 4 The photosensitive portion 41 is a photosensitive thin film transistor, the functional layer 30 includes a gate layer 31 and a display thin film transistor 32, the gate layer 31 is arranged on the side of the photosensitive layer 40 facing away from the first substrate 10, and the display thin film transistor 32 is arranged on the side of the gate layer 31 facing away from the photosensitive layer 40, and the gate of the photosensitive thin film transistor and the gate of the display thin film transistor 32 are both electrically connected to the gate layer 31.

[0057] in, Figure 4 A is a partial top view of a touch display device of an embodiment. Optionally, the photosensitive layer 40 includes a metal layer, an isolation layer and a semiconductor layer. The semiconductor layer is connected to the surface of the gate layer 31 facing away from the display thin film transistor 32, and the metal layer is connected to the surface of the semiconductor layer facing away from the gate layer 31 to form a photosensitive thin film transistor. The semiconductor layer constitutes the channel of the photosensitive thin film transistor, the metal layer constitutes the source and drain of the photosensitive thin film transistor, the gate layer 31 constitutes the gate of the photosensitive thin film transistor, and the isolation layer is connected between the metal layer and the first substrate 10 to insulate and protect the metal layer and the semiconductor layer. Optionally, the structure of the display thin film transistor 32 is similar to that of the photosensitive thin film transistor, which can be referred to and will not be repeated.

[0058] When the photosensitive thin film transistor is irradiated by light from the touch control unit 51 , the conductivity of the semiconductor structure of the photosensitive thin film transistor is increased due to the light, so that the source and drain of the photosensitive thin film transistor are turned on, thereby generating leakage current, that is, generating a touch signal.

[0059] Optionally, the touch display device 100 further includes a scan line Gn, a photosensitive data line L1, and a display data line L2. The scan line Gn is electrically connected to the gate layer 31. The scan line Gn is used to output a scan signal to the gate layer 31 so that the photosensitive thin film transistor and the display thin film transistor 32 are turned on to realize the display function. The photosensitive data line L1 is electrically connected to the source of the photosensitive thin film transistor to output a display signal to the photosensitive thin film transistor, and the display data line L2 is electrically connected to the source of the display thin film transistor 32 to output a display signal to the display thin film transistor 32. Optionally, the scan line Gn is set in the gate layer 31, the photosensitive data line L1 is set in the metal layer, and the display data line L2 is set in the same layer as the source of the display thin film transistor 32.

[0060] Optional, please refer to Figure 4 , in the orthographic projection in the stacking direction of the touch display device 100, the photosensitive data line L1 overlaps with the display data line L2, and the photosensitive thin film transistor overlaps with the display thin film transistor 32. It should be explained that in order to distinguish the different positions of the photosensitive layer 40 and the functional layer 30 in the stacking direction of the touch display device 100, Figure 4 The portion corresponding to the photosensitive layer 40 is indicated by a dotted line. Figure 4 The rest of the parts are represented by solid lines.

[0061] Optionally, the metal layer can be made of metals such as molybdenum, aluminum, aluminum-nickel alloy, molybdenum-tungsten alloy, chromium, or copper, or a combination of the above-mentioned thin films can be used without limitation. Optionally, the material of the gate layer 31 is similar to that of the metal layer, which can be referred to and will not be described in detail. Optionally, the semiconductor layer is usually an island structure, and the material can be amorphous silicon, polycrystalline silicon, metal oxide, etc., without limitation. Optionally, the isolation layer can be made of inorganic materials such as silicon nitride, silicon oxide, and silicon oxynitride, without limitation.

[0062] Optionally, in the photosensitive layer 40 and the functional layer 30, except for the areas where the thin film transistor 32, the photosensitive thin film transistor and the wiring are displayed, the remaining areas are hollow structures and covered with a flat layer. The flat layer can be made of a material with good light transmittance so that the hollow areas of the photosensitive layer 40 and the functional layer 30 can pass light to display images.

[0063] Optionally, the touch display device 100 also includes a driving unit, a source driving board and a flexible printed circuit board. The driving unit is electrically connected to the scan line Gn, and the driving unit is used to input a scan signal to the scan line Gn. The flexible printed circuit board is electrically connected to both the photosensitive data line L1 and the display data line L2, and is also electrically connected to the source driving board. The source driving board is used to input a display signal to the photosensitive data line L1 and the display data line L2 through the flexible printed circuit board.

[0064] Optionally, the driving unit and the source driving board are both electrically connected to the aforementioned driving chip. When the photosensitive thin film transistor outputs a touch signal to the driving chip, the driving chip can control the driving unit and the source driving board to send corresponding signals to control the display of the touch display device 100, wherein the photosensitive thin film transistor and the display thin film transistor 32 can both perform display functions.

[0065] Compared with On Cell technology and plug-in technology, which require separate flexible printed circuit boards to be attached to the display screen and the touch screen respectively, since the photosensitive thin film transistor and the display thin film transistor 32 of the touch display device 100 provided by the present invention are both arranged between the first substrate 10 and the second substrate 20, the touch display device 100 provided by the present invention can achieve the coordinated connection between the touch function and the display function by attaching a flexible printed circuit board once, thereby reducing the complexity of the manufacturing process and the production cost of the touch display device 100.

[0066] By setting the photosensitive portion 41 as a photosensitive thin film transistor, the functional layer 30 includes a gate layer 31 and a display thin film transistor 32, the gate layer 31 is arranged on the side of the photosensitive layer 40 facing away from the first substrate 10, and the display thin film transistor 32 is arranged on the side of the gate layer 31 facing away from the photosensitive layer 40, and the gate of the photosensitive thin film transistor and the gate of the display thin film transistor 32 are both electrically connected to the gate layer 31, so that the touch display device 100 can complete the recognition of the touch position by generating leakage current through the photosensitive thin film transistor receiving light, and at the same time, the photosensitive thin film transistor and the display thin film transistor 32 are arranged to share the same gate layer 31, so that the touch display device 100 can perform the touch function synchronously without affecting the normal display function, and there is no need to perform the display function and the touch function in time periods within one frame time like the traditional touch scheme, thereby improving the touch response rate.

[0067] Please refer to Figures 2 to 4 The photosensitive thin film transistors, the display thin film transistors 32 and the touch control parts 51 are arranged in an array, and the multiple display thin film transistors 32 and the multiple touch control parts 51 are arranged one by one with the multiple photosensitive thin film transistors. The photosensitive layer 40 also includes multiple detection lines L3, and each detection line L3 is electrically connected to the drain of at least one photosensitive thin film transistor.

[0068] Among them, the refractive index of the touch layer 50 is greater than the refractive index of the first substrate 10, that is, the touch layer 50 is a photophobic layer relative to the first substrate 10. When the light enters the first substrate 10 from the touch layer 50, the refraction angle of the light will be greater than the incident angle of the light. Therefore, the gap between any two adjacent photosensitive thin film transistors will be determined according to the refractive index of the touch layer 50, the refractive index of the first substrate 10 and the thickness of the first substrate 10.

[0069] Optionally, the detection line L3 is disposed on the aforementioned metal layer and is electrically connected to the aforementioned driving chip, and the touch signal output by the photosensitive thin film transistor is input to the driving chip through the detection line L3.

[0070] By setting a plurality of photosensitive thin film transistors, display thin film transistors 32 and touch control parts 51 arranged in an array, the plurality of display thin film transistors 32 and the plurality of touch control parts 51 are arranged one-to-one with the plurality of photosensitive thin film transistors, and the photosensitive layer 40 also includes a plurality of detection lines L3, each detection line L3 is electrically connected to the drain of at least one photosensitive thin film transistor, so that any position of the touch display area can generate a touch signal under touch pressure, and the touch signal is timely transmitted to the driving chip through the detection line L3, and the plurality of detection lines L3 do not affect each other, thereby improving the touch recognition accuracy and touch response rate of the touch display device 100.

[0071] Please refer to Figure 5 The drains of the plurality of photosensitive thin film transistors in the same column are all electrically connected to the same detection line L3, or the drains of the photosensitive thin film transistors in the same row are all electrically connected to the same detection line L3.

[0072] in, Figure 5 FIG. B is a partial top view of a touch display device of an embodiment. Specifically, since the scan line Gn is usually arranged horizontally, in a preferred embodiment, the drain electrodes of the multiple photosensitive thin film transistors in the same column are electrically connected to the same detection line L3. When the user touches the touch layer 50, the multiple touch portions 51 are pressed, so that the multiple photosensitive thin film transistors will generate leakage current. The leakage current of the photosensitive thin film transistors in the same column is input to the aforementioned driving chip through the same detection line L3. The driving chip determines the touch position according to the time when the leakage current is generated and the time corresponding to the scanning line Gn opened at this time.

[0073] Among them, the leakage current generated by the photosensitive thin film transistor under light is small, while the detection line L3 and other wirings have resistance. There is signal loss in the process of the leakage current generated by a photosensitive thin film transistor being input to the driver chip through a detection line L3 alone, which can easily cause the driver chip to fail to identify the touch position.

[0074] By setting the drains of multiple photosensitive thin-film transistors located in the same column to be electrically connected to the same detection line L3, or the drains of photosensitive thin-film transistors located in the same row to be electrically connected to the same detection line L3, when multiple photosensitive thin-film transistors generate touch signals, multiple thin-film transistors located in the same column or the same row can output touch signals through the same detection line L3, so as to increase the leakage current on one detection line L3 and ensure accurate recognition of the touch position.

[0075] Please refer to Figure 2 and Figure 6 The touch display device 100 further includes a light source 60, and the light source 60 is used to emit light to the touch layer 50. Optionally, the light source 60 can emit visible light or infrared light to the touch layer 50, without limitation.

[0076] In one embodiment, the touch display device 100 provided by the present invention is a liquid crystal display. The touch display device 100 is displayed through a backlight light source 60. The light source 60 is arranged outside the functional layer 30 to emit light to the touch layer 50 without affecting the normal display of the touch display device 100.

[0077] In another embodiment, the touch display device 100 provided by the present invention is an OLED display panel, and the functional layer 30 is displayed through an anode plate, a light-emitting plate and a cathode plate that are overlapped in sequence. The light source 60 is arranged outside the functional layer 30 to emit light to the touch layer 50, and does not affect the normal display of the touch display device 100.

[0078] In another embodiment, the touch display device 100 provided by the present invention is an LED display panel, and the functional layer 30 displays by emitting light through multiple lamp beads in the packaging layer. The light source 60 is arranged outside the functional layer 30 to emit light into the touch layer 50, which will not affect the normal display of the touch display device 100.

[0079] There is another implementation method, please refer to Figure 7 The touch display device 100 provided by the present invention can also use ambient light as the light source for the light sensing unit 41 to identify touch.

[0080] The touch display device 100 further includes a light source 60 for emitting light into the touch layer 50 , so that the touch layer 50 has sufficient light, so that the photosensitive portion 41 corresponding to the touched position undergoes an obvious current change, thereby improving the strength of the touch signal and the touch sensitivity.

[0081] Please refer to Figure 2 and Figure 6 The functional layer 30 further includes a color resist layer 33 and a liquid crystal layer 34 . The color resist layer 33 is disposed on a surface of the second substrate 20 facing the first substrate 10 , and the liquid crystal layer 34 is disposed on a side of the color resist layer 33 facing away from the second substrate 20 .

[0082] Among them, in this embodiment, the touch display device 100 is a liquid crystal display. Optionally, the liquid crystal layer 34 is used to change the arrangement direction or physical state to realize the polarization function, and the light from the color resistance layer 33 passes through the liquid crystal layer 34 to form polarized light, and then projects to the display area to produce a picture. Optionally, the functional layer 30 also includes an insulating layer 35, and the insulating layer 35 is arranged between the display thin film transistor 32 and the liquid crystal layer 34. Optionally, the material of the insulating layer 35 is similar to the material of the aforementioned isolation layer, which can be used for reference and will not be repeated.

[0083] Please refer to Figure 6 The touch display device 100 also includes a light guide plate 70, which is arranged on the side of the second substrate 20 facing away from the first substrate 10; the light source 60 includes a first light source 61 and a second light source 62, the first light source 61 is connected to the light guide plate 70, and the second light source 62 is connected to the touch layer 50.

[0084] Optionally, the color resist layer 33 includes a shading portion 331 and a filtering portion 332. In the overlapping direction of the touch display device 100, the shading portion 331 overlaps with the display thin film transistor 32 and the photosensitive portion 41. The shading portion 331 is used to block the light from the first light source 61 to prevent the light from the first light source 61 from irradiating the photosensitive portion 41, and the filtering portion 332 is used to filter the light from the first light source 61 to obtain the required three primary colors of light.

[0085] Alternatively, please refer to Figure 2 The touch display device 100 also includes a first light guide plate 71 and a second light guide plate 72. The first light guide plate 71 is arranged on the surface of the second substrate 20 facing away from the first substrate 10. One end of the second light guide plate 72 is connected to the first light guide plate 71, and the other end is connected to the touch layer 50. The light source 60 is connected to the first light guide plate 71 or the second light guide plate 72.

[0086] The first light guide plate 71 is used to guide light directly to the second substrate 20 to form a backlight, and the second light guide plate 72 is used to guide light to enter the touch layer 50 from the side of the touch layer 50. Optionally, the first light guide plate 71 and the second light guide plate 72 can be an integrated structure, or can be connected by bonding, hot melting, etc., without limitation.

[0087] By setting the functional layer 30 to also include a color resist layer 33 and a liquid crystal layer 34, the color resist layer 33 is arranged on the surface of the second substrate 20 facing the first substrate 10, and the liquid crystal layer 34 is arranged on the side of the color resist layer 33 facing away from the second substrate 20, the touch display device 100 also includes a light guide plate 70, and the light guide plate 70 is arranged on the side of the second substrate 20 facing away from the first substrate 10; the light source 60 includes a first light source 61 and a second light source 62, the first light source 61 is connected to the light guide plate 70, and the second light source 62 is connected to the touch layer 50, or the touch display device 100 also includes a first light guide plate 71 and The second light guide plate 72 and the first light guide plate 71 are arranged on the surface of the second substrate 20 facing away from the first substrate 10. One end of the second light guide plate 72 is connected to the first light guide plate 71, and the other end is connected to the touch layer 50. The light source 60 is connected to the first light guide plate 71 or the second light guide plate 72, so that when the touch display device 100 is a liquid crystal display, the touch layer 50 and the functional layer 30 can share the same light source 60 or use the first light source 61 and the second light source 62 respectively to realize the touch function and the display function. The structural setting is flexible, which is beneficial to adopt corresponding solutions for arrangement according to actual product needs.

[0088] Please refer to Figure 2 and Figure 3 The touch display device 100 further includes a transparent conductive layer 80, which is disposed between the first substrate 10 and the touch layer 50. The transparent conductive layer 80 is used to isolate static electricity from the outside. Optionally, the transparent conductive layer 80 may be made of a transparent conductive material, specifically indium tin oxide or indium zinc oxide, without limitation. Optionally, when the touch layer 50 is subjected to contact pressure, the touch portion 51 elastically contacts the transparent conductive layer 80.

[0089] In the aforementioned In Cell technology, since the touch sensor needs to be directly embedded in the glass substrate of the display screen (relative to the second substrate 20 of this solution), the external touch signal needs to enter the array substrate through the glass substrate. Therefore, the transparent conductive layer 80 cannot be coated on the glass substrate to isolate external electrostatic interference.

[0090] In the touch display device 100 provided by the present invention, the photosensitive layer 40 is arranged between the first substrate 10 and the functional layer 30, and the photosensitive layer 40 can perform touch operation only by irradiating light onto the photosensitive portion 41. Therefore, a transparent conductive layer 80 can be arranged between the first substrate 10 and the touch layer 50 to isolate external electrostatic interference without affecting the touch operation, thereby improving the electrostatic protection capability of the touch display device 100.

[0091] In the description of the embodiments of the present invention, it should be noted that the orientation or positional relationship of terms such as "center", "up", "down", "left", "right", "vertical", "horizontal", "inside" and "outside" are based on the orientation or positional relationship described in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0092] What is disclosed above is only a preferred embodiment of the present invention, and it certainly cannot be used to limit the scope of rights of the present invention. Ordinary technicians in this field can understand that all or part of the processes of the above embodiment and equivalent changes made according to the claims of the present invention still fall within the scope covered by the present invention.

Claims

1. A touch display device, characterized in that: include: a first substrate; a second substrate, arranged opposite to the first substrate; A functional layer is disposed between the first substrate and the second substrate; A photosensitive layer, disposed between the first substrate and the functional layer, the photosensitive layer comprising a photosensitive portion, the photosensitive portion being used to receive light and generate a touch signal; A touch layer is arranged on a side of the first substrate facing away from the second substrate, the touch layer comprises a touch portion, and the touch portion is arranged corresponding to the photosensitive portion; When the touch portion is not subjected to touch pressure, the light is totally reflected in the touch portion; when the touch portion is subjected to touch pressure, the touch portion is elastically deformed, and the light is refracted in the touch portion and incident on the photosensitive portion; Among them, the photosensitive part is a photosensitive thin film transistor, the functional layer includes a gate layer and a display thin film transistor, the gate layer is arranged on the side of the photosensitive layer facing away from the first substrate, and the display thin film transistor is arranged on the side of the gate layer facing away from the photosensitive layer, and the gate of the photosensitive thin film transistor and the gate of the display thin film transistor are both electrically connected to the gate layer, so that the touch display device can synchronously perform the touch function without affecting the normal display function, and there is no need to perform the display function and the touch function in time periods within one frame time like the traditional touch scheme, thereby improving the touch response rate.

2. The touch display device according to claim 1, characterized in that: The touch layer also includes a touch panel, which is arranged opposite to the first substrate. The touch portion is arranged on a surface of the touch panel facing the first substrate. Light enters the touch portion from the touch panel. When the touch panel is subjected to touch pressure, the touch panel deforms and squeezes the touch portion, so that the touch portion deforms elastically.

3. The touch display device according to claim 2, characterized in that: In the cross section of the touch layer, the contour shape of the touch portion is an arc protruding from the touch panel toward one side of the first substrate.

4. The touch display device according to claim 1, characterized in that: The photosensitive thin film transistor, the display thin film transistor and the touch control unit are all arranged in an array, and the multiple display thin film transistors and the multiple touch control units are arranged in a one-to-one correspondence with the multiple photosensitive thin film transistors; The photosensitive layer further comprises a plurality of detection lines, each of which is electrically connected to a drain electrode of at least one of the photosensitive thin film transistors.

5. The touch display device according to claim 4, characterized in that: The drain electrodes of the plurality of photosensitive thin film transistors in the same column are all electrically connected to the same detection line; or, the drain electrodes of the photosensitive thin film transistors in the same row are all electrically connected to the same detection line.

6. The touch display device according to claim 1, characterized in that: The touch display device further includes a light source, and the light source is used to emit light to the touch layer.

7. The touch display device according to claim 6, characterized in that: The functional layer further comprises a color resist layer and a liquid crystal layer, wherein the color resist layer is arranged on a surface of the second substrate facing the first substrate, and the liquid crystal layer is arranged on a side of the color resist layer facing away from the second substrate; The touch display device further includes a light guide plate, which is arranged on a side of the second substrate facing away from the first substrate; the light source includes a first light source and a second light source, the first light source is connected to the light guide plate, and the second light source is connected to the touch layer; or, The touch display device also includes a first light guide plate and a second light guide plate. The first light guide plate is arranged on the surface of the second substrate facing away from the first substrate. One end of the second light guide plate is connected to the first light guide plate, and the other end is connected to the touch layer. The light source is connected to the first light guide plate or the second light guide plate.

8. The touch display device according to claim 1, characterized in that: The touch display device further includes a transparent conductive layer, which is disposed between the first substrate and the touch layer, and is used to isolate external static electricity.

9. An electronic device, characterized in that: The invention comprises a housing and the touch display device according to any one of claims 1 to 8, wherein the touch display device is accommodated in the housing.

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