CN210015428U - Image sensing device and display device - Google Patents
Image sensing device and display device Download PDFInfo
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- CN210015428U CN210015428U CN201920266891.3U CN201920266891U CN210015428U CN 210015428 U CN210015428 U CN 210015428U CN 201920266891 U CN201920266891 U CN 201920266891U CN 210015428 U CN210015428 U CN 210015428U
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Abstract
The utility model relates to an image sensing device and display device. The image sensing device comprises a light emitting source, a light transmitting substrate, a micro lens array layer and an image sensor array layer, wherein light emitted by the light emitting source is reflected back by a target object, the reflected light is focused on the image sensor array layer through the micro lens array layer, the directivity of a light source is improved, the intensity of light is enhanced and the light energy utilization rate is improved, the image information of the target object is sensed more accurately by the image sensor array layer, the touch precision is improved, and therefore the touch signal of a user is sensed.
Description
Technical Field
The utility model relates to a show technical field, especially relate to an image sensing device and display device.
Background
With the development of display technology, display devices equipped with touch sensing are also increasingly widely used. Such display devices allow a user to control the device for display by "touch input". Among them, optical touch is a common way of touch-sensitive display devices. However, the exemplary optical touch sensing display device is generally easily affected by factors such as the intensity of light, so that the device has a problem of low touch accuracy or even touch failure, so that the device cannot sense a touch signal of a user.
Therefore, the exemplary touch display device has a problem that touch accuracy is low or touch failure occurs when a user touches the touch display device, and a touch signal of the user cannot be sensed, which brings a bad experience to the user.
SUMMERY OF THE UTILITY MODEL
Accordingly, it is desirable to provide an image sensing device and a display device capable of improving touch accuracy.
In order to realize the utility model discloses a purpose, the utility model discloses a following technical scheme:
an image sensing device comprising:
a light emitting source that provides a light source to a target;
the device comprises a light-transmitting substrate, a light-transmitting substrate and a light-emitting diode, wherein one side of the light-transmitting substrate is provided with a contact surface of a target object;
the micro lens array layer is arranged on one side of the light-transmitting substrate, which is far away from the contact surface, and is used for focusing light reflected by a target on the image sensor array layer; and
the image sensor array layer is arranged on one side, away from the light-transmitting substrate, of the micro lens array layer and is used for sensing light reflected by a target object and generating image information corresponding to the target object according to the reflected light.
In one embodiment, the image sensing device has a sensing distance, and the microlens array layer focuses light reflected by the target onto the image sensor array layer when the distance between the target and the contact surface is less than or equal to a preset sensing distance.
In one embodiment, the microlens array layer has a thickness of 10um to 500 um.
In one embodiment, the microlens array layer includes a light transmissive medium portion and a lens cell array disposed on the light transmissive medium portion.
In one embodiment, the lens unit array includes a plurality of lens units, and the lens units are convex lenses.
In one embodiment, the refractive index of the material of the light-transmissive medium portion is smaller than the refractive index of the material of the lens unit.
In one embodiment, in the lens unit array, a light shielding unit is arranged between adjacent lens units.
In one embodiment, the image sensor array layer includes a phototransistor sensor and an array of sensor pixels.
In one embodiment, the image sensing device further comprises an encapsulation layer disposed between the light-transmissive substrate and the microlens array layer; or the encapsulation layer is disposed between the image sensor array layer and the microlens array layer.
A display device, comprising:
a plurality of image sensing regions including the image sensing device as described above;
and the touch circuit is arranged to acquire touch information of the target object according to the image information sensed by the image sensing device.
The image sensing device comprises a light emitting source, a light transmitting substrate, a micro lens array layer and an image sensor array layer, wherein light emitted by the light emitting source is reflected back by a target object, the reflected light is focused on the image sensor array layer through the micro lens array layer, the directivity of the light source is improved, the intensity of light is enhanced and the light energy utilization rate is improved, the image information of the target object is sensed more accurately by the image sensor array layer, the touch precision is improved, and therefore the touch signal of a user is sensed.
The display device has high touch precision, can accurately sense the touch signal of the user, and improves the experience of the user.
Drawings
FIG. 1 is a schematic structural diagram of an image sensor device according to an embodiment;
FIG. 2 is a schematic structural diagram of a microlens array layer corresponding to the image sensor device of FIG. 1;
FIG. 3 is a schematic view of another microlens array layer corresponding to the image sensor device of FIG. 1;
FIG. 4 is a schematic diagram of a partial structure of the image sensor device corresponding to FIG. 1;
FIG. 5 is a schematic structural diagram of an image sensor device according to another embodiment;
FIG. 6 is a schematic structural diagram of an image sensor device according to another embodiment;
fig. 7 is a schematic structural diagram of a display device according to an embodiment.
Detailed Description
In order to facilitate understanding of the present invention, the present invention will be described more fully hereinafter with reference to the accompanying drawings. Alternative embodiments of the present invention are shown in the drawings. The invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
Referring to fig. 1, fig. 1 is a schematic structural diagram of an image sensing device in the present embodiment.
In the present embodiment, the image sensor device 10 includes a light source (not shown), a transparent substrate 110, a microlens array layer 120, and an image sensor array layer 130.
In this embodiment, the light emitting source provides light to the target, and the light source includes, but is not limited to, one or more of near ultraviolet light, violet light, blue light, green light, yellow light, red light, near infrared light, or white light, and the color of the emitted light may be different according to the actual arrangement of the light emitting source. In one embodiment, the light emitting source may be a backlight; in another embodiment, the light emitting source can be a side light source, and the specific position is set according to actual conditions. The target object refers to a target sensing object of the image sensing device, and may refer to a finger of a user, for example.
In the present embodiment, the transparent substrate 110 has a contact surface for an object on one side, and is configured to be in contact with the object or in non-contact with the object. When the distance between the target object and the contact surface is smaller than or equal to the preset sensing distance, the micro-lens array layer focuses light reflected by the target object onto the image sensor array layer, and the touch sensing function of the image sensing device is achieved. The preset sensing distance can be set according to the actual application condition, and is not limited herein; the "non-contact touch with the object" refers to a state when the object is not in contact with the contact surface but the distance between the object and the contact surface is less than or equal to a preset sensing distance. Thus, the image sensing device can sense the image information of the target object within the preset sensing distance range without limiting that the target object must be in contact with the contact surface. The transparent substrate 110 may be, but not limited to, one of a glass substrate and a plastic substrate. In one embodiment, the glass substrate may be an alkali-free borosilicate ultra-thin glass having high physical properties, good corrosion resistance, high thermal stability, and low density and high elastic modulus.
In this embodiment, the microlens array layer 120 is disposed on a side of the transparent substrate 110 away from the contact surface, and the microlens array layer 120 is disposed to focus light reflected by the target onto the image sensor array layer, so that the light reflected by the target is accurately incident on the image sensor array layer 130, and the intensity of the light source is enhanced, and the image sensor array layer 130 senses image information of the target more accurately, and the object is not limited by the depth of field during imaging, so that the focusing effect can be achieved, the touch accuracy is improved, and a touch signal of a user is sensed.
In one embodiment, the thickness of the microlens array layer 120 is 10um-500um to occupy only a small range of space of the image sensing device 10 while improving touch accuracy.
In one embodiment, referring to fig. 2, the microlens array layer 120 includes a light transmissive medium part 120a and a lens cell array 120b disposed on the light transmissive medium part 120 a.
Wherein the focal plane of the lens cell array 120b is on the image sensor array layer 130, thereby improving the directivity of the reflected light and simultaneously increasing the intensity of the light, so that the image sensor array layer 130 can perform detection and generate high-quality image information corresponding to the target object. The lens unit array 120b includes a plurality of lens units, the lens units are convex lenses, and the convex surfaces of the lens units include, but are not limited to, circular and elliptical. The width of the lens unit in the direction parallel to the microlens array layer 120 is not limited, and may be specifically set according to the focal length of the lens unit in practical application, so that the light reflected by the target is focused on the image sensor array layer 130. Referring to fig. 3, in the lens cell array 120b, a light shielding unit 120c including a light shielding material may be disposed between adjacent lens cells, and the disposition of the light shielding unit may appropriately reduce the disposition of the lens cells, or the disposition of the light shielding unit may adjust the positions of the lens cells. The width of the light shielding unit may be the same as or different from that of the lens unit.
Wherein, the light-transmitting medium part 120a may be a support part for supporting the lens unit array 120 b; the refractive index of the material of the light-transmitting medium part 120a is smaller than that of the material of the lens units, so as to ensure that each lens unit can fully perform the light-gathering function, for example, the material of the lens unit array 120b may include polymethyl methacrylate, or may include a transparent medium material such as air. The thickness of the transparent medium section 120a is set in accordance with the radius of curvature of the lens unit, the focal length of the lens unit, the refractive index of the lens unit material, and the like, and the effect of adjustable focusing is achieved. In one embodiment, the width of the transparent medium portion 120a in the thickness direction of the microlens array layer 120 is not limited, and may be specifically set according to the focal length of the lens unit in practical application, so that the light reflected by the target is focused on the image sensor array layer 130. In another embodiment, the thickness of the transparent medium portion 120a is kept as thin as possible while ensuring that the lens unit can perform the corresponding light focusing function, and even the thickness of the transparent medium portion 120a can be zero, so that the transparent medium portion 120a can be directly integrated on the image sensor array layer 130, and no additional support portion is required, thereby reducing the production cost.
In this embodiment, the image sensor array layer 130 is configured to sense light reflected by the object and generate image information corresponding to the object based on the reflected light. Referring to fig. 4, a light source reflected by a target (M point in the drawing) is focused on an image sensor of an image sensor array layer 130 through a microlens array layer 120.
In one embodiment, if the target is a finger, then a stronger reflected light is formed where the light source hits the fingerprint peaks; if the light hits the valleys of the fingerprint, a weaker reflected light is formed. Thus, the image sensor array layer 130 can reconstruct the shape of the fingerprint by using the strength of the read signal.
In one embodiment, the image sensor array layer 130 includes a phototransistor sensor array and a sensor pixel array, the sensor pixel array sensing light reflected by the object, the phototransistor sensor array generating image information corresponding to the object based on the reflected light, whereby the object is imaged by the microlens array layer 120 imaging principle in conjunction with the phototransistor sensor array and the sensor pixel array. The size of each pixel in the sensor pixel array can be selected and set according to the requirements of actual products. The plurality of sensor pixels may be arranged in a row-column matrix, and the number of sensor pixels may correspond to the number of lens units, and in one embodiment, may be one sensor pixel corresponding to one lens unit. The sensor pixel array may be disposed on a phototransistor sensor array. The sensor pixel array may also be disposed on the substrate in parallel with the phototransistor sensor array. In one embodiment, the phototransistor sensor array comprises a-Si TFT phototransistor sensors, the sensor pixel array comprises a-Si TFT pixels, and the image sensor array layer 130 has a high optical utilization, thereby improving the quality of optical information transfer. In another embodiment, the phototransistor sensor array comprises a-Si: H TFT phototransistor sensors and the sensor pixel array comprises a-Si: H TFT pixels, and the image sensor array layer 130 has a higher optical utilization, thereby improving the quality of optical information transfer.
In one embodiment, the image sensor array layer 130 may be embedded on a TFT (Thin Film Transistor) substrate to form an embedded optical touch panel, so that the attaching yield of the touch panel is not required to be considered, there is no limitation on the size or the productivity, and the display device is thinner and lighter and has an enhanced aesthetic appearance.
The image sensing device provided by the embodiment includes a light source, a transparent substrate 110, a microlens array layer 120 and an image sensor array layer 130, light emitted from the light source is reflected back by a target object, and the reflected light is focused on the image sensor array layer 130 through the microlens array layer 120, so that the directivity of the light source is improved, the intensity of light is enhanced, the light energy utilization rate is improved, the image sensor array layer 130 senses image information of the target object more accurately, the touch precision is improved, and therefore a touch signal of a user is sensed.
Referring to fig. 5 and 6, the present embodiment further provides another image sensing device 20, where the image sensing device 20 includes a light emitting source (not shown), a transparent substrate 210, a microlens array layer 220, an image sensor array layer 230, and an encapsulation layer 240.
For the light-emitting sources, the transparent substrate 210, the microlens array layer 220, and the image sensor array layer 230, reference is made to the related descriptions of the light-emitting sources, the transparent substrate 110, the microlens array layer 120, and the image sensor array layer 130 in the previous embodiment, and the description thereof is omitted here.
In the present embodiment, in order to protect the device from the environment, isolate oxygen and moisture, and thus improve the stability of the light source and the lifespan of the image sensing device, the image sensing device further includes an encapsulation layer 240, and the encapsulation layer 240 may be disposed between the light-transmitting substrate 210 and the microlens array layer 220 (see fig. 5); an encapsulation layer 240 may also be disposed between the image sensor array layer 230 and the microlens array layer 220 (see fig. 6). The encapsulation layer 240 is a transparent layer, and may be a single-layer structure or a multi-layer lamination; the substrate may be a substrate or a thin film. The material of the encapsulation layer 240 is not limited, and may be, for example, an inorganic material layer, including but not limited to silicon oxide, silicon nitride, etc., which can serve as an effective barrier layer for water/oxygen; or an organic material layer including, but not limited to, high molecular polymer, resin, etc., may be used as the flexible encapsulation layer.
The image sensing device provided by this embodiment includes a light emitting layer 210, a microlens array layer 220, an image sensor array layer 230, and an encapsulation layer 240, light emitted from a light emitting source is reflected back by a target object, and the reflected light is focused on the image sensor array layer 230 through the microlens array layer 220, so as to improve the directivity of the light source, enhance the intensity of the light and improve the light energy utilization rate, so that the image sensor array layer 230 can sense image information of the target object more accurately, improve the touch accuracy, and sense a touch signal of a user; meanwhile, the influence of the environment on the image sensing device 20 can be further isolated by the encapsulation layer 240, so that the stability and the safety of the image sensing device 20 are improved, and the service life is prolonged.
The embodiment also provides a display device, which comprises a plurality of image sensing areas and a touch circuit; the image sensing area includes the image sensing device as described in the above embodiments, and the touch circuit is configured to obtain touch information of the target object according to the image information sensed by the image sensing device and perform a subsequent operation. The touch information includes a touch point position of the target object, the number of the touch points, and the like.
The arrangement positions and the number of the image sensing area and the touch circuit are not limited. In one embodiment, the display device includes three image sensing areas disposed on three sides (corresponding to area a, area B and area of fig. 7) of an active area (see area AA of fig. 7) of a panel of the display device, and one touch circuit disposed on a bottom side (corresponding to area D of fig. 7) of the panel.
The display device provided by the embodiment has higher touch precision, can accurately sense the touch signal of the user, and improves the experience of the user.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.
Claims (10)
1. An image sensing apparatus, comprising:
a light emitting source that provides a light source to a target;
the device comprises a light-transmitting substrate, a light-transmitting substrate and a light-emitting diode, wherein one side of the light-transmitting substrate is provided with a contact surface of a target object;
the micro lens array layer is arranged on one side of the light-transmitting substrate, which is far away from the contact surface, and is used for focusing light reflected by a target on the image sensor array layer; and
the image sensor array layer is arranged on one side, away from the light-transmitting substrate, of the micro lens array layer and is used for sensing light reflected by a target object and generating image information corresponding to the target object according to the reflected light.
2. The image sensing device of claim 1, wherein the image sensing device has a preset sensing distance, and the microlens array layer focuses light reflected by the object onto the image sensor array layer when the distance between the object and the contact surface is less than or equal to the preset sensing distance.
3. The image sensing device of claim 1, wherein the microlens array layer has a thickness of 10-500 um.
4. The image sensing device of claim 1, wherein the microlens array layer comprises a light transmissive medium portion and an array of lens cells disposed on the light transmissive medium portion.
5. The image sensing device according to claim 4, wherein the lens cell array includes a plurality of lens cells therein, the lens cells being convex lenses.
6. The image sensing device of claim 5, wherein the refractive index of the light transmissive medium portion material is less than the refractive index of the lens unit material.
7. The image sensing device according to claim 4, wherein a light shielding unit is disposed between adjacent lens cells in the lens cell array.
8. The image sensing device of any of claims 1-7, wherein the image sensor array layer comprises a phototransistor sensor and an array of sensor pixels.
9. The image sensing device according to any one of claims 1 to 7, further comprising an encapsulation layer disposed between the light-transmissive substrate and the microlens array layer; or the encapsulation layer is disposed between the image sensor array layer and the microlens array layer.
10. A display device, comprising:
a plurality of image sensing regions comprising an image sensing device according to any one of claims 1-9;
and the touch circuit is arranged to acquire touch information of the target object according to the image information sensed by the image sensing device.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112738958A (en) * | 2021-01-13 | 2021-04-30 | 王陈陈 | Real-time driving system for vehicle steering lamp |
| CN113703182A (en) * | 2020-05-22 | 2021-11-26 | 北京芯海视界三维科技有限公司 | Method for manufacturing lenticular grating |
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2019
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113703182A (en) * | 2020-05-22 | 2021-11-26 | 北京芯海视界三维科技有限公司 | Method for manufacturing lenticular grating |
| CN112738958A (en) * | 2021-01-13 | 2021-04-30 | 王陈陈 | Real-time driving system for vehicle steering lamp |
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