CN210428407U

CN210428407U - OLED touch screen and touch terminal

Info

Publication number: CN210428407U
Application number: CN201921942805.2U
Authority: CN
Inventors: 杨沐; 曹志日; 杨喆; 范浩强
Original assignee: Beijing Megvii Technology Co Ltd
Current assignee: TIANJIN JIHAO TECHNOLOGY CO LTD
Priority date: 2019-11-11
Filing date: 2019-11-11
Publication date: 2020-04-28
Anticipated expiration: 2029-11-11

Abstract

The utility model provides an OLED touch screen and touch terminal, which relates to the technical field of semiconductors, wherein the OLED touch screen comprises a protective layer, an OLED layer and an optical image sensor layer which are arranged in sequence, and the OLED layer is positioned between the protective layer and the optical image sensor layer; the OLED layer is packaged with an OLED display module, and the optical image sensor layer is provided with a sensor chip; when the OLED display module is triggered to be lightened in a point light source mode, light rays with the emission angles within a preset angle range are totally reflected through the protective layer; the sensor chip is used for receiving the total reflection light formed after the total reflection of the protective layer and converting the total reflection light into an electric signal. Through the utility model discloses, do not need too much optical structure for whole OLED display module assembly's thickness reduces greatly, simultaneously, has also shortened the light path of light propagation, and then can be applicable to the intelligent terminal of ultra-thinization, has effectively satisfied the trend of intelligent terminal to ultra-thinization development.

Description

OLED touch screen and touch terminal

Technical Field

The utility model belongs to the technical field of the semiconductor technology and specifically relates to a OLED touch-sensitive screen and touch terminal are related to.

Background

The full-face screen of the intelligent terminal is the mainstream, so that the lower fingerprint of an OLED (Organic Light emitting Display) screen based on the Display technology becomes the current hot technical research direction, compared with the traditional LCD (Liquid Crystal Display) technology, the OLED Display technology has obvious advantages, is lighter and thinner, has low energy consumption, high brightness, good luminous efficiency, can Display pure black and the like, and can also be bent, so that the application of the OLED Display technology in the fields of current televisions, computers (displays), mobile phones, flat panels and the like is more and more extensive.

At present, in the product of OLED display technology, the optical structure that uses is mostly the lens structure, and the demand of lens structure and light path can make the thickness of whole display structure at millimeter magnitude usually, is difficult to satisfy the trend that intelligent terminal developed to ultra-thinness.

SUMMERY OF THE UTILITY MODEL

In view of this, the present invention provides an OLED touch panel and a touch terminal to alleviate the above technical problem.

In a first aspect, an embodiment of the present invention provides an OLED touch panel, including a protective layer, an OLED layer, and a contact image sensor optical image sensor layer, which are sequentially disposed, where the OLED layer is located between the protective layer and the optical image sensor layer; the OLED layer is packaged with an OLED display module, and the optical image sensor layer is provided with a sensor chip; when the OLED display module is triggered to be lightened in a point light source mode, light rays with the emission angles within a preset angle range are totally reflected through the protective layer; the sensor chip is used for receiving the total reflection light formed after the total reflection of the protective layer and converting the total reflection light into an electric signal.

In an optional embodiment, the OLED display module includes a substrate, an OLED array, and an encapsulation layer, which are sequentially disposed; the OLED array is located between the substrate and the packaging layer, the sensor chip is attached to one side of the substrate, and the protection layer is arranged on one side of the packaging layer.

In an alternative embodiment, the sensor chip is a CIS chip, and the sensor chip is attached to the base material by an adhesive material.

In an optional embodiment, the substrate is further provided with a fitting hole, and the sensor chip is fitted in the fitting hole through an adhesive material.

In an optional embodiment, when the sensor chip is attached, the adhesive material on the edge of the sensor chip is a first adhesive material, and the adhesive material in the middle area of the sensor chip is a second adhesive material, wherein the viscosity of the first adhesive material is greater than that of the second adhesive material.

In an alternative embodiment, the sensor chip is further provided with a chip protection layer.

In an optional embodiment, the chip protection layer is attached to the sensor chip in a full-attachment manner; or the sensor chip is provided with a micro prism, and the chip protective layer is attached to the micro prism on the sensor chip in a full-attaching mode; the chip protection layer is a glass layer with the thickness smaller than a preset thickness threshold value.

In an alternative embodiment, the dot light sources of the OLED display module are square, circular or circular.

In an optional embodiment, the light source diameter of the point light source of the OLED display module is between 350um and 550 um.

In an optional embodiment, the light emitting direction of the point light source of the OLED display module is a direction facing the protective layer, and when the light emitting angle is between a first preset angle and a second preset angle, an amplified annular imaging area is formed on the sensor chip after the light is totally reflected by the protective layer; the first preset angle is smaller than the second preset angle.

In an optional embodiment, the point-like light source of the OLED display module is further configured to form an enlarged first annular imaging region on the sensor chip when the point-like light source is triggered to light for the first time, and form an enlarged second annular imaging region on the sensor chip when the point-like light source is triggered to light for the second time, where the second annular imaging region is used to fill in a non-imaging region in the first annular imaging region.

In an optional embodiment, the protection layer includes a cover plate, a touch module, and a polarizer, which are sequentially disposed.

In an optional embodiment, an imaging surface of the sensor chip is a rectangular image surface; after the total reflection light passes through the polaroid, an elliptical annular imaging area is formed on the sensor chip; the long side direction of the imaging surface of the sensor chip is consistent with the long axis direction of the elliptical annular imaging area, and the short side direction of the imaging surface of the sensor chip is consistent with the short axis direction of the elliptical annular imaging area.

In an optional embodiment, the protective layer is further provided with a phase retarder; the phase retarder is closely attached to any side of the polarizer.

In an optional embodiment, the OLED touch screen is further provided with an infrared filter layer; wherein the infrared filter layer is disposed on a light receiving side of the optical image sensor layer.

In an optional embodiment, the infrared filter layer is provided with an infrared filter, and the infrared filter is an absorption infrared filter.

In a second aspect, the embodiment of the present invention further provides a touch terminal, wherein the touch terminal is configured with the OLED touch screen of the first aspect.

The embodiment of the utility model provides a following beneficial effect has been brought:

the embodiment of the utility model provides an OLED touch screen and touch terminal, its OLED touch screen includes protective layer, OLED layer and the contact image sensor optical image sensor layer that sets gradually, wherein, the OLED layer is located between protective layer and the optical image sensor layer, and, the OLED layer is packaged with OLED display module assembly, and the optical image sensor layer is provided with the sensor chip, makes when OLED display module assembly is triggered to light with punctiform light source mode, the light of emission angle in predetermineeing the angle scope can produce the total reflection through the protective layer; and then the sensor chip receives the total reflection light formed after the total reflection, and converts the total reflection light into an electric signal for subsequent processing. In the process that the light that sends at punctiform light source produces the total reflection, because do not need too much optical structure for the thickness of whole OLED display module assembly reduces greatly, simultaneously, has also shortened the light path of light propagation, and then can be applicable to the intelligent terminal of ultra-thinization, has effectively satisfied the trend that intelligent terminal developed to ultra-thinization.

Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.

In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a basic structure of an OLED touch screen;

fig. 2 is a schematic structural diagram of an OLED touch panel according to an embodiment of the present invention;

fig. 3 is a schematic structural diagram of another OLED touch panel according to an embodiment of the present invention;

fig. 4 is a schematic diagram illustrating an OLED touch panel according to an embodiment of the present invention;

fig. 5 is a schematic diagram of an imaging system provided by an embodiment of the present invention;

fig. 6 is a schematic view of another imaging provided by an embodiment of the present invention;

fig. 7 is a schematic view of another imaging provided by an embodiment of the present invention;

fig. 8 is a schematic structural diagram of another OLED touch panel according to an embodiment of the present invention.

Reference numerals: 10-a protective layer; 20-an OLED layer; 201-an OLED display module; 30-an optical image sensor layer; 301-a sensor chip; 302-a glue layer; 202-a substrate; 203-point light source; 204-an encapsulation layer; 101-a cover plate; 102-a touch module; 103-a polarizer; 104-phase retarder.

Detailed Description

To make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by the skilled in the art without creative work belong to the protection scope of the present invention.

Currently, the lower finger print of the OLED screen is the direction of the popular technical research, and for convenience of description, fig. 1 shows the basic structure of an OLED touch screen, as shown in fig. 1, the OLED touch screen generally includes a cover plate, an inductive keyboard, a polarizer, an OLED structure, an optical imaging structure, and an image sensor, that is, in some prior arts, two parts of the optical imaging structure and the image sensor are disposed under the OLED structure.

In the current OLED product, most of the optical imaging structures are lens structures, including lenses, filters, and lens frames, bearing seats and the like, which form optical paths, and the requirements of these lens structures and optical paths can cause the thickness of the image sensor + the optical imaging structures to be in millimeter level, and the thickness is thicker, which conflicts with the trend of the current intelligent terminal developing to ultrathin flowers.

Based on this, the embodiment of the utility model provides a OLED touch-sensitive screen and touch terminal can reduce the thickness of OLED structure to alleviate above-mentioned technical problem.

For the convenience of understanding the present embodiment, an OLED touch screen disclosed in the embodiments of the present invention will be described in detail first.

In a possible implementation manner, the embodiment of the present invention provides an OLED touch screen, and in particular, the OLED touch screen may be applied to a touch terminal or an intelligent terminal with a touch display function, such as a smart phone, a tablet computer, a desktop computer, a palm computer, and the like, and in particular, as shown in fig. 2, the OLED touch screen provided by the embodiment of the present invention includes a protective layer 10, an OLED layer 20, and a contact image sensor optical image sensor layer 30, which are sequentially disposed, wherein the OLED layer 20 is located between the protective layer 10 and the optical image sensor layer 30;

the OLED layer 20 encapsulates the OLED display module 201, and the optical image sensor layer 30 is provided with a sensor chip 301.

Specifically, when the OLED display module is triggered to light in a point light source mode, light rays with an emission angle within a preset angle range are totally reflected through the protective layer;

the sensor chip is used for receiving the total reflection light formed after total reflection and converting the total reflection light into an electric signal.

During the in-service use, the COVER layer that above-mentioned protective layer was usually regarded as OLED touch-sensitive screen attaches on OLED touch-sensitive screen's upper surface, above-mentioned OLED display module assembly lights the light source with the mode of punctiform light source, because the COVER layer belongs to the propagation process that light is by optically dense medium to optically sparse medium to the air bed, consequently, can take place the total reflection when the launch angle of light satisfies certain angle range, so when having touch-control operation on OLED touch-sensitive screen, the valley ridge difference of finger can embody through the intensity difference of total reflection, specifically, after the finger contacted the protective layer, the total reflection still takes place for the corresponding position of valley, the ridge corresponds the position and can destroy the total reflection, and then produce the intensity difference, form the fingerprint image, and will have the total reflection light signal of intensity difference by optical image sensor layer, in order to carry out the imaging operation.

The embodiment of the utility model provides an OLED touch screen, including protective layer, OLED layer and the contact image sensor optical image sensor layer that sets gradually, wherein, the OLED layer is located between protective layer and the optical image sensor layer, and, the OLED layer is packaged with OLED display module assembly, and the optical image sensor layer is provided with sensor chip for when OLED display module assembly is triggered to light with punctiform light source mode, the light of emission angle in predetermineeing the angle range can produce the total reflection through the protective layer; and then the sensor chip receives the total reflection light formed after the total reflection, and converts the total reflection light into an electric signal for subsequent processing. In the process that the light that sends at punctiform light source produces the total reflection, because do not need too much optical structure for the thickness of whole OLED display module assembly reduces greatly, simultaneously, has also shortened the light path of light propagation, and then can be applicable to the intelligent terminal of ultra-thinization, has effectively satisfied the trend that intelligent terminal developed to ultra-thinization.

In practical use, the Sensor chip is mostly a CIS (Contact Image Sensor) chip, which uses a Contact type photosensitive element to sense light and convert an optical signal into an electrical signal, and further performs an imaging operation, and the like, and the optical Image Sensor layer provided with the Sensor chip may also be referred to as a CIS layer.

Furthermore, the OLED display module comprises a substrate, an OLED array and an encapsulating layer which are sequentially arranged, the OLED array is located between the substrate and the encapsulating layer, in addition, the substrate, the OLED array and the encapsulating layer of the OLED display module are sequentially arranged in the direction from the optical image sensor layer of the OLED touch screen to the protecting layer, the sensor chip of the optical image sensor layer is attached to one side of the substrate, and the protecting layer is arranged on one side of the encapsulating layer.

Specifically, the sensor chip is attached to the substrate through the adhesive material, the adhesive material is generally transparent adhesive material in order not to affect light, and in addition, considering reworkability of the OLED touch screen, the adhesive material can use reworkable glue, such as 60-degree-centigrade reworkable glue, which is convenient for reworking and can avoid element damage caused by forcible disassembly.

Furthermore, the substrate used in the substrate of the OLED display module is mostly a PI (polyimide film) substrate, and thus the sensor chip can be attached to the lower side of the PI substrate when the sensor chip is not attached, specifically, an attachment hole is further formed at an attachment position on the substrate, the sensor chip is attached in the attachment hole through a glue material, in the specific implementation, a hole needs to be formed in a back plate film layer (such as conductive glue, copper foil and foam) of the OLED display module to form the attachment hole, and then the sensor chip is attached, when the sensor chip is attached, the glue material at the edge of the sensor chip generally adopts a first glue material, and the glue material at the middle area of the sensor chip generally adopts a second glue material, wherein the viscosity of the first glue material is greater than that of the second glue material, specifically, the first glue material is mostly a strong glue material, and the second glue material is mostly a weak glue material, the method is based on the actual use condition so as to meet the ultrathin requirement of the OLED touch screen.

For easy understanding, fig. 3 shows a schematic structural diagram of another OLED touch screen, which includes a protective layer 10, an OLED display module and an optical image sensor layer 30 of an OLED layer, and a glue layer 302 for attaching the optical image sensor layer 30.

Among them, the OLED layer shown in fig. 3 only shows the substrate 202 of the OLED display module, the plurality of point light sources 203 included in the OLED array, and the encapsulation layer 204.

Further, the sensor chip may be further provided with a chip protection layer (not shown in fig. 3), specifically, the chip protection layer is attached to the sensor chip in a full-attachment manner; or the sensor chip is provided with the microprism, and the chip protective layer is attached to the microprism on the sensor chip in a full-attaching mode and is used for protecting the microprism structure and pixels on the sensor chip and preventing damage caused by rework; the chip protection layer is a glass layer with the thickness smaller than a preset thickness threshold value. Taking a CIS chip as an example, the CIS chip is packaged on an optical image sensor layer to form a CIS sensor, and for the situation with a micro-prism structure, a layer of thin glass can be manufactured on the micro-prism in a full-lamination mode to protect the micro-prism structure and pixels on the CIS sensor and prevent damage caused by rework, so that the imaging of large-angle light is prevented from being influenced by refraction of a frame lamination air layer in the full-lamination mode; in addition, considering that the micro-prism structure only improves the light efficiency, and the micro-prism structure may or may not have the effect for fingerprint application, therefore, in order to reduce the design cost, a layer of thin glass can be manufactured for protection in a full-lamination mode for the CIS sensor without the micro-prism structure. Further, to not taking the CIS sensor of microprism structure, can also laminate thin glass totally, but adopt the direct mode with the laminating of CIS chip and OLED layer to protect, the structure of specific chip protective layer can set up according to the in-service use condition, the embodiment of the utility model provides a do not restrict to this.

Based on fig. 3, in the embodiment of the present invention, through directly laminating the sensor chip below the OLED substrate, the thickness that optical imaging structure and light path among the prior art brought is removed, and the whole thickness can be made within the micron order of magnitude. When the OLED touch screen is used for an intelligent terminal, the point light source is lightened through the OLED display module in the imaging process and is irradiated on the protective layer.

The protective layer is used as a protective screen of the OLED touch screen and generally comprises transparent structural layers such as transparent glass or resin, so that when light rays emitted by the point-shaped light source are transmitted through the protective layer like air, the light rays belong to the transmission process from an optically dense medium to an optically sparse medium, and total reflection can occur, so that when finger fingerprint touch is performed, the valley and ridge difference of a finger can be reflected through the intensity difference of the total reflection, when the sensor chip receives the total reflection light rays formed after the total reflection, the total reflection light rays can be converted into electric signals, and meanwhile, images are formed on the sensor chip.

Further, the shape of the point-like light sources 203 included in the OLED array in fig. 3 may be square, circular or circular, and there are a plurality of point-like light sources, and for convenience of description, only 2 point-like light sources are shown in fig. 3 when being lit, and in actual use, the point-like light sources are preferably circular to generate light beams that are uniform in all directions, and the shape and the number of the specific point-like light sources may be set according to the size of the actual OLED touch screen and the properties of the OLED array, which is not limited by the embodiment of the present invention.

In practical use, the protective layer comprises a cover plate, a touch module and a polarizer which are arranged in sequence; the COVER plate in the protective layer is usually arranged on the outermost layer of the OLED touch screen to serve as a protective screen, that is, COVER, so that the COVER plate is usually made of transparent glass or resin and the like to perform total reflection on light rays within a preset angle range; touch module indicates the induction type keyboard of OLED touch-sensitive screen, and the polaroid is then to carrying out the polarisation through the polarization principle to the light of penetrating into the OLED touch-sensitive screen and is handled, and the specification and the model of specific touch module and polaroid can set up according to the in-service use condition, the embodiment of the utility model discloses do not restrict to this.

To the above-mentioned protective layer including apron, touch-control module and polaroid, its thickness is generally less than 900 μm, and the gluey material layer that is used for pasting the sensor chip is about 100 μm usually, and to the CIS chip, the optics image sensor layer thickness at its place is about 150 μm, consequently, compares with millimeter level's optics imaging structure and image sensor thickness among the prior art, among the OLED touch-sensitive screen of the embodiment of the utility model, optics image sensor layer can be with thickness control at micron level, has greatly reduced the thickness of OLED touch-sensitive screen.

Further, fig. 4 shows a schematic diagram of an OLED touch screen, wherein for ease of understanding, fig. 4 illustrates a point light source 203, and fig. 4 only shows the protective layer 10 including the cover plate, the touch module and the polarizer, the optical image sensor layer 30, and the adhesive layer 302.

When the point light source of the OLED array is lightened, the light emitting direction of the point light source faces the protective layer, the preset angle range of the light emitting angle is between a first preset angle and a second preset angle, wherein the first preset angle is smaller than the second preset angle, namely, the light emitting angle of the light emitted by the point light source is greater than the first preset angle and can be totally reflected when being transmitted to the cover plate of the protective layer, and the second preset angle is usually the maximum light emitting angle of the light source of the OLED array.

Specifically, a light path formed by two-dimensionally emitting light of the point-like light source is as shown in fig. 4, light is totally reflected at a contact interface between a cover plate in the protective layer and a finger, and the totally reflected light formed after the total reflection is received by a sensor chip of the optical image sensor layer, generally, a total reflection angle formed by a material of the cover plate is about 40 degrees, and an emission angle of the point-like light source in the OLED array is about 70 degrees at maximum, that is, a second preset angle is about 70 degrees, so that an imaging area is in a range of 40 to 70 degrees; as shown in fig. 4, the total reflection of the light on the fingerprint object surface formed on the outer surface of the cover plate by the toilet paper fingerprint is smaller than the fingerprint image surface formed on the optical image sensor layer due to the total reflection of the light, that is, the image surface formed on the optical image sensor layer by the total reflection of the light is enlarged compared with the fingerprint object surface formed on the outer surface of the cover plate by the toilet paper fingerprint, and the enlargement ratio is related to the thickness of the protective layer.

Based on fig. 4, assuming that the vertical distance between the point-like light source and the object plane is h1, and the vertical distance between the object plane and the image plane is h2, the magnification a can be expressed as: and a ═ h1+ h2)/h1, the magnification ratio a is about 2.2, calculated on the basis of the thickness of the protective layer being about 900 μm, the thickness of the adhesive layer being about 100 μm, and the thickness of the optical image sensor layer being about 150 μm.

Because the material of the cover plate has a certain angle requirement on total reflection, the plane of the point light source which can be imaged and is formed on the optical image sensor layer is in a ring shape, namely an amplified ring-shaped imaging area is formed on the sensor chip, and as shown in fig. 5, the circle at the center of the ring-shaped imaging area forms a non-imaging area within a first preset angle; the peripheral ring forms the imaging area of the fingerprint.

In addition, the dot light source of the OLED display module is further configured to be activated for a second time to fill the non-imaging area of the annular imaging area, and specifically, the non-imaging area of the annular imaging area can be completed by activating the OLED array for a second time, that is, when the dot light source of the OLED display module is activated for the first time, an enlarged first annular imaging area is formed on the sensor chip, and when the dot light source is activated for the second time, an enlarged second annular imaging area is formed on the sensor chip, and the second annular imaging area is configured to fill the non-imaging area in the first annular imaging area, and when the dot light source is activated for the second time, the closest dot light source to the current dot light source is activated to be activated to activate, so as to form a primary annular image for the finger print again, so as to fill the non-imaging area in fig. 5, the imaging schematic after padding is shown in fig. 6. As can be seen from fig. 6, since the non-imaging region of one of the point light sources is located within the imaging region of the neighboring point light source, the non-imaging region of the point light source can be effectively filled up by the secondary lighting method. During concrete implementation, the mode of above-mentioned secondary point of lamp can light the punctiform light source of OLED array according to the in-service use condition and trigger, the embodiment of the utility model provides a do not restrict to this.

In practical use, the light source diameter of the point light source of the OLED display module is about 350um to 550um, for example, if the OLED touch screen displays 500ppi, the size of the point light source is about 7 pixels to 11 pixels, and if the size exceeds this size, a phenomenon of fingerprint blurring may be present during imaging, and if the size is less than 7 pixels, luminance required for imaging may be insufficient, so for the point light source of the OLED array that emits light with a maximum luminance of 600nit, the number of pixels may be correspondingly adjusted to be square, circular, or the like to adapt to the corresponding size, wherein the point light source is preferably circular, and since the circle is a symmetrical structure in all directions, a more uniform image may be generated.

Further, considering that the light of the point-shaped light source is affected by the polarizer in the protection layer, the image plane formed on the sensor chip after the totally reflected light passes through the polarizer is not actually a regular circular ring shape, but is an elliptical ring-shaped imaging area, as shown in fig. 7, and the major and minor axes of the ellipse are fixed. In order to avoid the waste of the effective area of the sensor chip, the imaging surface of the sensor chip is mostly selected to be a rectangular image surface, and taking the CIS chip as an example, the imaging surface of the CIS chip can be set to be an image surface of 6mm × 9mm, and so on, so that in order to obtain a larger imaging area on the sensor chip, the long side direction of the imaging surface of the sensor chip can be set to be consistent with the long axis direction of the elliptical ring-shaped imaging area shown in fig. 7, and the short side direction of the imaging surface of the sensor chip can be set to be consistent with the short axis direction of the elliptical ring-shaped imaging area shown in fig. 7.

And, because the enlarged effect of formation of image, under the condition of the same photosensitive volume of sensor chip, the utility model discloses the OLED touch-sensitive screen can realize higher image DPI output, makes the finger fingerprint show more meticulously, and the imaging quality is better, and the discernment is simpler and easier. For example, if a 500DPI image is to be realized, the DPI of the CIS chip is 250DPI, which can make the unit photosensitive area larger and the signal-to-noise ratio higher; correspondingly, compare prior art scheme, if the CIS chip is under the same condition of DPI, like 500DPI, then the utility model discloses the formation of image of OLED touch-sensitive screen can reach 1000 DPI.

In addition, in order to alleviate the problem of imaging area defects caused by the polarizer, a phase retarder may be disposed in the protective layer; the retarder is attached to any side of the polarizer, for example, a retarder is added on the upper part of the polarizer to change linear polarization into circular polarization so as to alleviate the problem of the imaging area defect.

Specifically, as shown in fig. 8, another structure diagram of an OLED touch screen is shown, taking a manner of adding a phase retarder on an upper layer of a polarizer in a protective layer as an example, specifically, fig. 8 shows a cover plate 101, a touch module 102 (e.g., an induction keyboard, etc.), and a polarizer 103 in the protective layer, and a phase retarder 104 added on an upper layer of the polarizer 103, as well as an OLED layer 20, a glue layer 302, and an optical image sensor layer 30. The retardation plate 104 shown in fig. 8 can destroy the linear polarization to become the circular polarization, thereby improving the problem of the area defect caused by the linear polarization.

In consideration of the fact that infrared light is emitted into the sensor chip to affect the imaging of the finger fingerprint in actual use, the OLED touch screen provided by the embodiment of the utility model can be further provided with an infrared filter layer to filter the emitted infrared light; the infrared filter layer is disposed on the light receiving side of the optical image sensor layer, and specifically, an infrared filter layer may be added to the protective layer, or an infrared filter layer may be added to the upper surface or the lower surface of the OLED layer.

Further, the infrared filter layer is provided with an infrared filter film IRCF (IR-cut filter), and the infrared filter film is an absorption infrared filter film, so that when external light exists, only light above 600nm can penetrate through the fingers after the external light passes through the fingers, and the external light is absorbed by the IRCF before reaching the optical image sensor layer, so that the imaging of the optical image sensor layer is not influenced.

In another possible implementation, the present invention further provides a touch terminal, where the touch terminal is configured with the OLED touch screen shown in the foregoing implementation. Specifically, the embodiment of the utility model provides an in touch terminal can be intelligent terminal such as smart mobile phone, panel computer, desktop, palm computer, can realize the touch-control function through above-mentioned OLED touch-sensitive screen.

The embodiment of the utility model provides a touch terminal has the same technical characteristic with the OLED touch-sensitive screen that above-mentioned embodiment provided, so also can solve the same technical problem, reaches the same technological effect.

It can be clearly understood by those skilled in the art that, for convenience and brevity of description, the specific working process of the touch terminal described above may refer to the corresponding process in the foregoing embodiment, and is not described herein again.

In addition, in the description of the embodiments of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases for those skilled in the art.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

Finally, it should be noted that: the above embodiments are only specific embodiments of the present invention, and are not intended to limit the technical solution of the present invention, and the protection scope of the present invention is not limited thereto, although the present invention is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: those skilled in the art can still modify or easily conceive of changes in the technical solutions described in the foregoing embodiments or make equivalent substitutions for some technical features within the technical scope of the present disclosure; such modifications, changes or substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. The OLED touch screen is characterized by comprising a protective layer, an OLED layer and an optical image sensor layer which are sequentially arranged, wherein the OLED layer is positioned between the protective layer and the optical image sensor layer;

the OLED layer is packaged with an OLED display module, and the optical image sensor layer is provided with a sensor chip;

when the OLED display module is triggered to be lightened in a point light source mode, light rays with the emission angles within a preset angle range are totally reflected through the protective layer;

the sensor chip is used for receiving the total reflection light formed after the total reflection of the protective layer and converting the total reflection light into an electric signal.

2. The OLED touch screen of claim 1, wherein the OLED display module comprises a substrate, an OLED array and an encapsulation layer arranged in sequence;

the OLED array is located between the substrate and the packaging layer, the sensor chip is attached to one side of the substrate, and the protection layer is arranged on one side of the packaging layer.

3. The OLED touch screen of claim 2, wherein the sensor chip is a CIS chip, and the sensor chip is attached to the substrate by an adhesive material.

4. The OLED touch screen as recited in claim 3, wherein the substrate is further provided with a fitting hole, and the sensor chip is fitted in the fitting hole through the adhesive material.

5. The OLED touch screen according to claim 3 or 4, wherein when the sensor chip is mounted, the adhesive material at the edge of the sensor chip is a first adhesive material, and the adhesive material at the middle area of the sensor chip is a second adhesive material, wherein the viscosity of the first adhesive material is greater than that of the second adhesive material.

6. The OLED touch screen according to any one of claims 1 to 3, wherein the sensor chip is further provided with a chip protection layer.

7. The OLED touch screen of claim 6, wherein the chip protection layer is attached to the sensor chip in a full-attachment manner;

or the sensor chip is provided with a micro prism, and the chip protective layer is attached to the micro prism on the sensor chip in a full-attaching mode; the chip protection layer is a glass layer with the thickness smaller than a preset thickness threshold value.

8. The OLED touch screen of claim 1, wherein the point-like light sources of the OLED display module are square, circular or circular in shape.

9. The OLED touch screen of claim 8, wherein when the point-like light source is circular or ring-shaped, the light source diameter of the point-like light source of the OLED display module is between 350um and 550 um.

10. The OLED touch screen according to claim 9, wherein a light emitting direction of the point light source of the OLED display module is a direction facing the protection layer, and when the light emitting angle is between a first preset angle and a second preset angle, an enlarged annular imaging area is formed on the sensor chip after the total reflection of the protection layer;

wherein the first preset angle is smaller than the second preset angle.

11. The OLED touch screen of claim 10, wherein the point-like light sources of the OLED display module are further configured to form an enlarged first annular imaging area on the sensor chip when lit by a first trigger, and form an enlarged second annular imaging area on the sensor chip when lit by a second trigger, the second annular imaging area being configured to fill in non-imaging areas in the first annular imaging area.

12. The OLED touch screen of claim 1, wherein the protection layer comprises a cover plate, a touch module and a polarizer, which are sequentially arranged.

13. The OLED touch screen of claim 12, wherein the imaging surface of the sensor chip is a rectangular image surface;

after the total reflection light passes through the polaroid, an elliptical annular imaging area is formed on the sensor chip; the long side direction of the imaging surface of the sensor chip is consistent with the long axis direction of the elliptical ring-shaped imaging area, and the short side direction of the imaging surface of the sensor chip is consistent with the short axis direction of the elliptical ring-shaped imaging area.

14. The OLED touch screen of claim 12, wherein the protective layer is further provided with a phase retarder; the phase retarder is tightly attached to any one side of the polarizer.

15. The OLED touch screen of claim 1, wherein the OLED touch screen is further provided with an infrared filter layer;

wherein the infrared filter layer is disposed on a light receiving side of the optical image sensor layer.

16. The OLED touch screen according to claim 15, wherein the infrared filter layer is provided with an infrared filter, and wherein the infrared filter is an absorptive infrared filter.

17. A touch terminal, characterized in that the touch terminal is provided with the OLED touch screen of any one of claims 1-16.