CN105184230A - Optical fingerprint sensor and electronic product - Google Patents
Optical fingerprint sensor and electronic product Download PDFInfo
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- CN105184230A CN105184230A CN201510500285.XA CN201510500285A CN105184230A CN 105184230 A CN105184230 A CN 105184230A CN 201510500285 A CN201510500285 A CN 201510500285A CN 105184230 A CN105184230 A CN 105184230A
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
- G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
- G06V40/12—Fingerprints or palmprints
- G06V40/13—Sensors therefor
- G06V40/1318—Sensors therefor using electro-optical elements or layers, e.g. electroluminescent sensing
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Abstract
The invention discloses an optical fingerprint sensor and an electronic product. The optical fingerprint sensor comprises a pixel substrate; and a printing ink layer which is disposed at the upper surface of the pixel substrate or disposed above the pixel substrate, wherein the printing ink layer comprises multiple uniformly distributed holes, and the area of the holes accounts for 0.1% to 10% of the area of the whole printing ink layer. According to the optical fingerprint sensor is provided with the printing ink layer with the multiple holes, and the area of the holes accounts for 0.1% to 10% of the area of the printing ink layer, such that the color matching problem is overcome, the transmittance problem is also overcome, the fingerprint imaging effect of the optical fingerprint sensor is improved, the optical fingerprint sensor does not have to consider selection of a backlight color and an appearance color, a scheme of any color light sources is realized, and the appearance color of the optical fingerprint sensor meets the requirement of a user.
Description
Technical field
The present invention relates to fingerprint sensing field, particularly relate to a kind of optical fingerprint sensor and electronic product.
Background technology
Fingerprint imaging recognition technology is the fingerprint image being collected human body by fingerprint sensor, then compares with the existing fingerprint imaging information in system, whether carrys out correct judgment, and then realize the technology of identification.Due to the convenience that it uses, and the uniqueness of somatic fingerprint, fingerprint identification technology is widely used in every field.The gate control system and the consumer product area such as PC and mobile terminal etc. of the such as field of safety check such as public security bureau and customs, building.
The implementation of fingerprint imaging technique has the multiple technologies such as optical imagery, capacitance imaging and ultrasonic imaging.Comparatively speaking, optical image technology, its imaging effect is relatively better, and equipment cost is relatively low.
Existing optical fingerprint sensor is when being assembled to the electronic products such as mobile terminal, need the matching problem considering optical fingerprint sensor appearance color and mobile terminal outer cover plate color, and the color-match problem of optical fingerprint sensor internal backlight source and appearance color.Further, when carrying out described color-match, the transmitance problem simultaneously considering optical fingerprint sensor is also needed.
Summary of the invention
The problem that the present invention solves is to provide a kind of optical fingerprint sensor and electronic product, to improve the performance of optical fingerprint sensor.
For solving the problem, the invention provides a kind of optical fingerprint sensor, comprising:
Pixel substrate;
Ink layer, is positioned at described pixel substrate upper surface or is positioned at above described pixel substrate;
Described ink layer comprises equally distributed multiple perforate, and described perforated area accounts for 0.1% ~ 10% of whole described ink layer area.
Optionally, described optical fingerprint sensor also comprises cover sheet, and described cover sheet is positioned at above described pixel substrate, and described ink layer is positioned at upper surface or the lower surface of described cover sheet.
Optionally, described ink layer is positioned at the upper surface of described cover sheet, and described ink layer is covered by scratch resistant layer.
Optionally, described pixel substrate has pel array, described pel array has multiple pixel, the plan view shape of each described pixel is rectangle, the length of side of described rectangle is more than or equal to 10 μm, the plan view shape of described perforate is parallelogram, and the distance between described parallelogram opposite side is 1 μm ~ 3 μm.
Optionally, have glue-line between described ink layer and each surface, described ink layer is fixed on each surface by described glue-line.
Optionally, the thickness of described ink layer is 5 μm ~ 20 μm, and the thickness of described glue-line is less than 10 μm.
Optionally, described perforated area accounts for 2% ~ 4% of whole described ink layer area.
Optionally, described ink layer comprise multiple be intervally arranged the first axis the first ink strip and be multiplely intervally arranged in the second ink strip of the second axis, described perforate is surrounded by described first ink strip and the second ink strip.
For solving the problem, the invention provides a kind of electronic product, comprising:
Optical fingerprint sensor, described optical fingerprint sensor has pixel substrate;
Outer cover plate, be positioned at above described pixel substrate, described outer cover plate has through hole or blind hole, and described through hole runs through upper surface and the lower surface of described outer cover plate, and described blind hole is positioned at upper surface or the lower surface of described outer cover plate;
Ink layer, is positioned at described pixel substrate upper surface or is positioned at above described pixel substrate;
Described ink layer comprises equally distributed multiple perforate, and the area of described perforate accounts for 0.1% ~ 10% of whole described ink layer area.
Optionally; described outer cover plate has described through hole; described optical fingerprint sensor also comprises the cover sheet be positioned at above described pixel substrate, and described cover sheet is assemblied in described through hole, and described ink layer is positioned at upper surface or the lower surface of described cover sheet.
Optionally, described ink layer is positioned at the upper surface of described cover sheet, and described ink layer is covered by scratch resistant layer.
Optionally, described outer cover plate has described blind hole, and described ink layer is positioned at the position of the corresponding described blind hole of described outer cover plate inside surface, or described ink layer is positioned at the position of the corresponding described blind hole of described outer cover plate outside surface.
Optionally, described pixel substrate has pel array, described pel array has multiple pixel, the plan view shape of each described pixel is rectangle, the length of side of described rectangle is more than or equal to 10 μm, the plan view shape of described perforate is parallelogram, and the distance between described parallelogram opposite side is 1 μm ~ 3 μm.
Optionally, have glue-line between described ink layer and each surface, described ink layer is fixed on each surface by described glue-line.
Optionally, the thickness of described ink layer is 5 μm ~ 20 μm, and the thickness of described glue-line is less than 10 μm.
Optionally, described perforated area accounts for 2% ~ 4% of whole described ink layer area.
Optionally, described ink layer comprise multiple be intervally arranged the first axis the first ink strip and be multiplely intervally arranged in the second ink strip of the second axis, described perforate is surrounded by described first ink strip and the second ink strip.
Compared with prior art, technical scheme of the present invention has the following advantages:
In technical scheme of the present invention, by arranging the ink layer with multiple perforate, and arrange that perforated area accounts for ink layer area 0.1% ~ 10%, thus both overcome color-match problem, overcome again transmitance problem, the fingerprint imaging effect of optical fingerprint sensor is improved, also make optical fingerprint sensor need not consider choosing of backlight color and appearance color, realize the scheme of random color light source, and make the appearance color of optical fingerprint sensor meet user's requirement.
Accompanying drawing explanation
Fig. 1 is the optical fingerprint sensor structural representation that the embodiment of the present invention provides;
Fig. 2 is in optical fingerprint sensor shown in Fig. 1, the pixel array portion area schematic on pixel substrate;
Fig. 3 is structural representation region shown in Fig. 2 with ink layer;
Fig. 4 is that ink layer shown in Fig. 3 is by a kind of enlarged diagram of dotted line frame encirclement part;
Fig. 5 is that ink layer shown in Fig. 3 is by the another kind of enlarged diagram of dotted line frame encirclement part;
Fig. 6 shows the mobile terminal front elevation that another embodiment of the present invention provides;
Fig. 7 shows the cross-sectional view that mobile terminal shown in Fig. 6 obtains along the cutting of A-A dot-and-dash line;
Fig. 8 shows the mobile terminal front elevation that another embodiment of the present invention provides;
Fig. 9 shows the cross-sectional view that mobile terminal shown in Fig. 8 obtains along the cutting of B-B dot-and-dash line.
Embodiment
Existing optical fingerprint sensor, when being assembled to the electronic products such as mobile terminal, needs the matching problem considering optical fingerprint sensor appearance color and mobile terminal outer cover plate color.Such as, when mobile terminal outer cover plate is the first color, optical fingerprint sensor outward appearance also needs to be set to the first color usually, thus ensures the overall appearance solid colour of mobile terminal, to meet the request for utilization of user.If corresponding with mobile terminal outer cover plate for the appearance color of optical fingerprint sensor surface design is not become same color, there is significant difference in optical fingerprint sensor correspondence position and other position of outer cover plate, affect the overall appearance of mobile terminal, the request for utilization of user cannot be met.
The appearance color of optical fingerprint sensor is produced by ink layer usually.Existing optical fingerprint sensor adopts screen printing mode to make the ink layer of flood usually.But, the ink layer of this flood but makes optical fingerprint sensor run into the low problem of backlight transmitance, on the one hand, the color of backlight needs the color considering this layer of ink layer, and that is backlight color needs to choose especially, to ensure that backlight can better through this layer of ink layer, on the other hand, when this layer of ink layer is black, there will be backlight is which kind of color all cannot, through the situation of this layer of ink layer, cause optical fingerprint sensor to work.
For this reason, the invention provides a kind of new optical fingerprint sensor, described optical fingerprint sensor comprises pixel substrate and ink layer, described ink layer is positioned at described pixel substrate upper surface or is positioned at above described pixel substrate, and described ink layer comprises equally distributed multiple perforate, described perforated area accounts for 0.1% ~ 10% of whole described ink layer area.Owing to having described ink layer, both color-match problem when optical fingerprint sensor is follow-up is assemblied in corresponding electronic products had been overcome, overcome again the transmitance problem after optical fingerprint sensor itself and assembling, and make optical fingerprint sensor need not consider backlight color and the collocation designing appearance color, thus the light source of random color can be selected, described perforate also improves the transmitance of optical fingerprint sensor, thus improves the imaging effect of optical fingerprint sensor.
For enabling above-mentioned purpose of the present invention, feature and advantage more become apparent, and are described in detail specific embodiments of the invention below in conjunction with accompanying drawing.
The embodiment of the present invention provides a kind of optical fingerprint sensor, please refer to Fig. 1.Described optical fingerprint sensor comprises pixel substrate 120 and backlight 110, and pixel substrate 120 is positioned in backlight 110, and pixel substrate 120 has corresponding pel array (please refer to Fig. 2).Described optical fingerprint sensor also comprises ink layer 140, and ink layer 140 is positioned at pixel substrate 120 upper surface.A glue-line 130 is also had between ink layer 140 and pixel substrate 120 upper surface.Ink layer 140 comprises equally distributed multiple perforate 143 (please refer to Fig. 3), and perforate 143 area can account for 0.1% ~ 10% of whole ink layer 140 area.Ink layer 140 is directly finger 150, namely points 150 and can directly contact ink layer 140.
In the present embodiment, it is aperture opening ratio (aperture opening ratio is also called the ratio of effective transmission region and entire area) that perforate 143 area accounts for whole ink layer 140 area ratio, under the aperture opening ratio condition of 0.1% ~ 10%, the normal work of optical fingerprint sensor can be ensured, make the surface color of optical fingerprint sensor be well controlled simultaneously.This is because, ink layer 140 determines the surface color of optical fingerprint sensor, when to account for whole ink layer 140 area be 0.1% ~ 10% to perforate 143 area, because perforate 143 is equally distributed, therefore, the surface color of optical fingerprint sensor is not substantially by the impact of perforate 143.
The principle of work of the optical fingerprint sensor that the present embodiment provides is: human body finger is positioned on ink layer 140, the emergent light of backlight 110 can through pixel substrate 120, simultaneously, owing to ink layer 140 having equally distributed multiple perforate 143, and perforate 143 area can account for 0.1% ~ 10% of whole ink layer 140 area, because perforate 143 is equally distributed, therefore, when the size of each perforate 143 is less, eyes of user is subtle to perforate 143, that is, what user saw the remain ink layer 140 of whole.Simultaneously, when perforate 143 area can account for 0.1% ~ 10% of whole ink layer 140 area, backlight 110 has enough emergent lights can continue through ink layer 140, and occur to reflect and transmission at the interface of human body finger and ink layer 140, the light of reflection returns to ink layer 140, and by perforate 143 through ink layer 140, be irradiated on the respective pixel array of pixel substrate 120, to carry out opto-electronic conversion and signal transacting, realize the collection of fingerprint image, improve the imaging effect of optical fingerprint sensor.
In the present embodiment; ink layer 140 is positioned at whole optical fingerprint sensor outermost layer; scratch resistant layer (not shown) now can also be set on ink layer 140 to cover ink layer 140; even ink layer 140 is covered by described scratch resistant layer; thus prevent from pointing directly contact ink layer 140; and then protection ink layer 140, improve the term of life of ink layer 140.
In the present embodiment, ink layer 140 can be: by link stuff (resin), pigment, filler, auxiliary agent and solvent etc., mix equably, and through repeat-rolling, the gluey fluid of a kind of stickiness of formation.
In the present embodiment, the thickness of ink layer 140 can be 5 μm ~ 20 μm.If ink layer 140 thickness is too little, such as, when being less than 5 μm, then its colourity can not, be not enough to make optical fingerprint sensor outward appearance reach respective color; If ink layer 140 thickness is too large, such as, time more than 20 μm, technique manufacture difficulty is large on the one hand, wastes ink material on the other hand.
In the present embodiment, ink layer 140 is pasted onto on pixel substrate 120 upper surface by glue-line 130, and that is, ink layer 140 is fixed on surface pixels substrate 120 upper surface by glue-line 130.Glue-line 130 is whole structure, and the glue-line 130 of whole structure can adopt method for printing screen to be formed.The effect of glue-line 130 is the bonding effects strengthening ink layer 140 and respective surfaces.
In the present embodiment, the thickness of glue-line 130 is less than 10 μm.Usual glue-line 130 gets over Bao Yuehao, and the increase of glue-line 130 thickness can cause during light therethrough scattering occurs, thus causes the loss of fingerprint imaging quality, therefore, controls glue-line 130 thickness below 10 μm.In other embodiments, when ink layer 140 itself has enough stickiness, also glue-line 130 can not be used.
In the present embodiment, optical fingerprint sensor can also comprise light source, signal reads the structure such as chip and flexible printed circuit board.The side of backlight 110 or side can be provided with described light source.Backlight 110 can comprise light conducting plate structure and backlight bottom reflection structure, thus the light that point source of light (not shown) finds is dispersed into flat light source, equably through pixel substrate 120, improves fingerprint imaging effect.
Mention above, pixel substrate 120 has described pel array, and described pel array comprises the pixel (mark) of multiple array arrangement.Please refer to Fig. 2, show pixel array unit subregion on pixel substrate 120.See from Fig. 2, pixel substrate 120 comprises base plate and the pixel array region (mark) be positioned on base plate and peripheral circuit region (mark).Described peripheral circuit region can comprise driving circuit (not shown), described signal reads chip (not shown), described flexible printed circuit board (not shown) and the electric connection line (not shown) between them.
Described pixel array region comprises described pel array, described pel array specifically can comprise the multiple described pixel in ranks shape array arrangement, and the row and column at described pixel place limited by the drive wire 122 of many first directions and the data line 123 of many second directions.
In the present embodiment, the plan view shape of each described pixel is rectangle (described rectangle is limited by the drive wire 122 of many first directions and the data line 123 of many second directions), and the length of side of described rectangle is more than or equal to 10 μm.It is to match with the corresponding aperture 143 of follow-up setting that the length of side of described rectangle is more than or equal to 10 μm.Under more desirable state, the length of side of described rectangle can be chosen as and be more than or equal to 15 μm.
Please continue to refer to Fig. 2, each described pixel comprises Signal-controlled switch 1213 and photoelectric conversion unit 1214, and described pixel also comprises transparent region (mark), described transparent region can pass through light, and the light of backlight 110 can via described transparent region through described optical fingerprint sensor.That is, in whole described pixel array region, except drive wire 122, data line 123, Signal-controlled switch 1213 and photoelectric conversion unit 1214, also comprise described transparent region, described transparent region is for enabling the emergent light of light source 124 through described optical fingerprint sensor.
In the present embodiment, described pel array can adopt amorphous silicon film transistor (amorphousSiliconThinFilmTransistor, a-SiTFT) technique, low-temperature polysilicon film transistor (LowTemperaturePolySiliconThinFilmTransistor, LTPSTFT) semiconductor process techniques such as technique or oxide semiconductor thin-film transistor (OxideSemiconductorThinFilmTransistor, OSTFT) technique makes.
Please refer to Fig. 3, show the ink layer 140 be positioned on region shown in Fig. 2, ink layer 140 comprises multiple being intervally arranged and surrounds perforate 143 in the first ink strip 141 of the first axis and multiple being intervally arranged in the second ink strip 142, first ink strip 141 of the second axis and the second ink strip 142.
In the present embodiment, the first ink strip 141 and the second ink strip 142 are respectively two axially different ink strip, and they can adopt corresponding typography to make, and they limit corresponding perforate 143 jointly.In other embodiment, other method also can be adopted to form latticed perforate 143, such as, adopt one-step print technique directly to form perforate 143.The formation method of the present invention to perforate 143 is not construed as limiting.
It should be noted that, in other embodiment, ink layer 140 also can be positioned at above pixel substrate 120.Such as, when optical fingerprint sensor also comprises the cover sheet be positioned at above pixel substrate 120, described ink layer 140 can be positioned at upper surface or the lower surface of cover sheet.When ink layer 140 is positioned at the upper surface of described cover sheet; the direct contact being generally used for pointing due to described cover sheet upper surface presses; therefore; scratch resistant layer (not shown) can be set equally on ink layer 140 and cover ink layer 140; even ink layer 140 is covered by scratch resistant layer, thus protection ink layer 140.
Please refer to Fig. 4, when the first situation is shown, ink layer 140 shown in Fig. 3 is surrounded a kind of enlarged diagram of part by dotted line frame 144.Can see in figure, the second ink strip 142 of vertical second axis of the first ink strip 141 of the first axis, therefore, the plan view shape of perforate 143 is rectangle, and two groups of length of sides of described rectangle can be 1 μm ~ 3 μm.
Please refer to Fig. 5, when the second situation is shown, ink layer 140 shown in Fig. 3 is surrounded the another kind of enlarged diagram of part by dotted line frame 144.Can see in figure, the first ink strip 141 ' of the first axis is intersected mutually with the second ink strip 142 ' of the second axis, and now the first ink strip 141 ' is mutually not vertical with the second ink strip 142 ' of the second axis.The plan view shape of perforate 143 ' is parallelogram, and the distance between parallelogram opposite side is for being 1 μm ~ 3 μm, and the catercorner length of described parallelogram can be 1 μm ~ 5 μm.
It should be noted that, in other embodiment, except kind of the shape of two shown in Fig. 4 and Fig. 5, perforate 143 (or perforate 143 ') can also be with other shape.
In the present embodiment, the live width of the first ink strip 141 can be 5 μm ~ 7 μm, and the distance of adjacent first ink strip 141 can be 1 μm ~ 2 μm, i.e. the distance wherein between one group of length of side of perforate 143 is 1 μm ~ 2 μm.The live width of the second ink strip 142 can be 5 μm ~ 7 μm, and the distance of adjacent second ink strip 142 can be 1 μm ~ 2 μm, i.e. distance between another group length of side of perforate 143 is also 1 μm ~ 2 μm.By controlling the live width of the first ink strip 141 and the second ink strip 142, and the distance of adjacent second ink strip 142 of the Distance geometry controlling adjacent first ink strip 141, can ensure that perforate 143 makes ink layer 140 have suitable aperture opening ratio.Concrete, by above-mentioned setting, the present embodiment can make perforate 143 area account for 2% ~ 4% of whole ink layer 140 area further, and namely now described aperture opening ratio controls 2% ~ 4%.Now, each perforate 143 area is all less, and eyes of user is more subtle to perforate 143, meanwhile, in turn ensure that ink layer 140 has higher transmitance.Therefore, not only ensure that the light of backlight 110 can pass ink layer 140 preferably, ensures the fingerprint imaging better effects if of whole optical fingerprint sensor, and makes the appearance color better effects if of whole optical fingerprint sensor.
According to foregoing teachings, in the present embodiment, the rectangle length of side corresponding for described pixel is controlled be more than or equal to 10 μm, and be chosen as further and be more than or equal to 15 μm.And the size of perforate 143 has been carried out corresponding restriction, the plan view shape of such as perforate 143 is rectangle, two groups of length of sides of described rectangle can be 1 μm ~ 3 μm, the plan view shape of such as perforate 143 ' is parallelogram again, distance between described parallelogram opposite side is can be 1 μm ~ 3 μm, the catercorner length of described parallelogram can be 1 μm ~ 5 μm, such as the distance of adjacent first ink strip 141 can be 1 μm ~ 2 μm again, and the distance of adjacent second ink strip 142 also can be 1 μm ~ 2 μm.These limit, make the area of each perforate 143 (or perforate 143 ') all relatively little, and because they are evenly distributed, several perforates 143 (or perforate 143 ') are distributed with above each described pixel of final guarantee, therefore, each described pixel can both receive backlight 110 through light, thus ensure that whole ink layer 140 meets corresponding transmitance, ensure that the fingerprint imaging effect of optical fingerprint sensor.Further, the light sent due to backlight 110 is by perforate 143 through ink layer 140, and therefore, no matter which kind of color is backlight be, can both through ink layer 140.
Further, according to the width of each ink strip and the adjustment of distance, the present embodiment can realize the adjustment of aperture opening ratio, and makes ink layer 140 reach corresponding color-match requirement, reaches corresponding transmitance demand simultaneously.
In summary, in the optical fingerprint sensor that the present embodiment provides, by arranging the ink layer 140 with multiple perforate 143 (or perforate 143 '), and perforate 143 area accounts for 0.1% ~ 10% of ink layer 140 area, thus both overcome color-match problem, overcome again transmitance problem, the fingerprint imaging effect of optical fingerprint sensor is improved, also optical fingerprint sensor is made need not to consider choosing of backlight color and appearance color, realize the scheme of random color light source, and the appearance color of optical fingerprint sensor meets user's requirement.
In the optical fingerprint sensor that the present embodiment provides, due to color-match problem and transmitance problem can be overcome, therefore, ink layer 140 can adopt random color, no matter be white, black or other color, all can be applicable to described optical fingerprint sensor, increase corresponding range of choice.
Another embodiment of the present invention provides a kind of electronic product, and described electronic product is specially a kind of mobile terminal.It should be noted that, in other embodiment, described electronic product can also be panel computer, e-book or personal digital assistant etc.
Incorporated by reference to mobile terminal 200 front elevation showing the present embodiment with reference to figure 6 and Fig. 7, Fig. 6 and provide, Fig. 7 shows the cross-sectional view that mobile terminal 200 shown in Fig. 6 obtains along the cutting of A-A dot-and-dash line.As can see from Figure 6, mobile terminal 200 comprises outer cover plate 210 and screen 201, outer cover plate 210 has blind hole 211.Known with reference to figure 7, blind hole 211 is positioned at the outside surface (mark) of outer cover plate 210.Can see further from Fig. 7, mobile terminal 200 also comprises optical fingerprint sensor, described optical fingerprint sensor comprises pixel substrate 220, and outer cover plate 210 is positioned at above pixel substrate 220, and the structures and characteristics of pixel substrate 220 can with reference to previous embodiment corresponding contents.
Please continue to refer to Fig. 7, described optical fingerprint sensor also has ink layer 222, and the structures and characteristics of ink layer 222 can with reference to previous embodiment corresponding contents.
In the present embodiment, ink layer 222 is positioned at pixel substrate 220 upper surface, and ink layer 222 is corresponding with the position of blind hole 211.This is because, blind hole 211 position is usually different from the appearance color of other position of outer cover plate 210, be arranged on below blind hole 211 by described ink layer 222 correspondence, whole outer cover plate 210 can be made externally to get up solid colour, or make blind hole 211 correspondence position show corresponding colour match.
Please continue to refer to Fig. 7, have glue-line 221 between ink layer 222 and pixel substrate 220 upper surface, ink layer 222 is fixed on pixel substrate 220 upper surface by glue-line 221.It should be noted that, in other embodiment, glue-line can omit.
It should be noted that, in the present embodiment, described optical fingerprint sensor can also comprise backlight (not shown), light source (not shown), structure such as signal reading chip (not shown) and flexible printed circuit board (not shown) etc., can with reference to previous embodiment corresponding contents.
In the present embodiment, the structures and characteristics of ink layer 222 can with reference to previous embodiment corresponding contents, therefore, ink layer 222 comprises equally distributed multiple perforate (not shown), and the structure of described perforate, character and method for making can with reference to previous embodiment corresponding contents.
In the present embodiment, the area of described perforate accounts for 0.1% ~ 10% of whole ink layer 222 area, can with reference to previous embodiment corresponding contents.Concrete, ink layer 222 can comprise multiple be intervally arranged the first axis the first ink strip and be multiplely intervally arranged in the second ink strip of the second axis, described perforate is surrounded by the first ink strip and the second ink strip.
It should be noted that, in other embodiment, ink layer 222 can be positioned at above pixel substrate 220, such as, is positioned at the inside surface of outer cover plate 210.
It should be noted that, in other embodiment, blind hole also can be positioned at the inside surface of outer cover plate.Further, now ink layer also can be positioned at the inside surface of outer cover plate, and namely now ink layer is positioned at blind via bottom surface.
It should be noted that, in other embodiment, outer cover plate has blind hole, and ink layer is positioned at the position of the corresponding blind hole of outer cover plate outside surface.Namely now, ink layer can be positioned at the outermost layer of whole mobile phone terminal.If because now ink layer is not protected the direct contact that will be pointed, therefore, ink layer can be arranged and is covered by scratch resistant layer, thus protection ink layer.
In the present embodiment, pixel substrate 220 has pel array, pel array has multiple pixel, the plan view shape of each pixel is rectangle, the length of side of rectangle is more than or equal to 10 μm, the plan view shape of described perforate is parallelogram, and the distance between described parallelogram opposite side can be 1 μm ~ 3 μm, and the length of side of described parallelogram can be 1 μm ~ 5 μm.According to the adjustment of bore size described above, the present embodiment can adjust further and make described perforated area account for 2% ~ 4% of whole ink layer 222 area, thus improves corresponding fingerprint imaging effect and color-match effect further.
In the present embodiment, the thickness of ink layer 222 can be 5 μm ~ 20 μm, and the thickness of glue-line 221 can be less than 10 μm, and corresponding reason can with reference to previous embodiment corresponding contents.
In the mobile terminal 200 that the present embodiment provides, owing to having ink layer 222, therefore, it is identical or arrange in pairs or groups mutually that the appearance color of other position of outer cover plate 210 and outer cover plate 210 correspond to the appearance color of optical fingerprint sensor position, and because ink layer 222 has equally distributed described perforate, the light of backlight can through ink layer 222, therefore, optical fingerprint sensor need not consider the color of backlight, and also described perforate can also improve the fingerprint imaging effect of optical fingerprint sensor simultaneously.
Another embodiment of the present invention provides a kind of electronic product, and described electronic product is specially a kind of mobile terminal.It should be noted that, in other embodiment, described electronic product can also be panel computer, e-book or personal digital assistant etc.
Incorporated by reference to mobile terminal 300 front elevation showing the present embodiment with reference to figure 8 and Fig. 9, Fig. 8 and provide, Fig. 9 shows the cross-sectional view that mobile terminal 300 shown in Fig. 8 obtains along the cutting of B-B dot-and-dash line.As can see from Figure 8, mobile terminal 300 comprises outer cover plate 310 and screen 301, outer cover plate 310 has through hole (described through hole has assembled cover sheet 330).Known with reference to figure 9, described through hole runs through outside surface (mark) and the inside surface (mark) of outer cover plate 310.Can see further from Fig. 9, mobile terminal 300 also comprises optical fingerprint sensor, described optical fingerprint sensor comprises pixel substrate 320, and outer cover plate 310 is positioned at above pixel substrate 320, and the structures and characteristics of pixel substrate 320 can with reference to previous embodiment corresponding contents.Described optical fingerprint sensor also comprises cover sheet 330, and cover sheet 330 is assemblied in described through hole.
Please continue to refer to Fig. 9, described optical fingerprint sensor also has ink layer 340, and the structures and characteristics of ink layer 340 can with reference to previous embodiment corresponding contents.Ink layer 340 is positioned at pixel substrate 320 upper surface, and ink layer 340 is corresponding with the position of described through hole.This is because, described through hole position is usually different from the appearance color of other position of outer cover plate 310, be arranged on below described through hole by described ink layer 340 correspondence, whole outer cover plate 310 can be made externally to get up solid colour, or make described through hole correspondence position show corresponding colour match.
Though do not show in figure, but can also have glue-line between the upper surface of ink layer 340 and cover sheet 330 (outside surface), ink layer 340 is fixed on cover sheet 330 upper surface by described glue-line.
In the present embodiment; because ink layer 340 is positioned at the upper surface of cover sheet 330; now; ink layer 340 is positioned at the outermost layer of whole mobile phone terminal; if ink layer 340 is not protected the direct contact that will be pointed; therefore, ink layer 340 can be set and be covered (not shown) by corresponding scratch resistant layer, thus protection ink layer 340.
It should be noted that, in the present embodiment, described optical fingerprint sensor can also comprise backlight (not shown), light source, structure such as signal reading chip and flexible printed circuit board etc., can with reference to previous embodiment corresponding contents.
In the present embodiment, the structures and characteristics of ink layer 340 can with reference to previous embodiment corresponding contents, therefore, ink layer 340 comprises equally distributed multiple perforate (not shown), and the structure of described perforate, character and method for making can with reference to previous embodiment corresponding contents.
In the present embodiment, the area of described perforate accounts for 0.1% ~ 10% of whole ink layer 340 area, and its reason can with reference to previous embodiment corresponding contents.Concrete, ink layer 340 can comprise multiple be intervally arranged the first axis the first ink strip and be multiplely intervally arranged in the second ink strip of the second axis, described perforate is surrounded by the first ink strip and the second ink strip.
It should be noted that, in other embodiment, ink layer 340 can be the inside surface (lower surface) being positioned at cover sheet 330.
In the present embodiment, pixel substrate 320 has pel array, pel array has multiple pixel, the plan view shape of each pixel is rectangle, the length of side of described rectangle is more than or equal to 10 μm, the plan view shape of described perforate is parallelogram, and the distance between described parallelogram opposite side can be 1 μm ~ 3 μm, and the length of side of described parallelogram can be 1 μm ~ 5 μm.According to the adjustment of bore size described above, the present embodiment can adjust further and make described perforated area account for 2% ~ 4% of whole ink layer 340 area, thus improves corresponding fingerprint imaging effect and color-match effect further.
In the present embodiment, the thickness of ink layer 340 can be 5 μm ~ 30 μm, and the thickness of glue-line 331 can be less than 10 μm, and corresponding reason can with reference to previous embodiment corresponding contents.
In the mobile terminal 300 that the present embodiment provides, owing to having ink layer 340, therefore, it is identical or arrange in pairs or groups mutually that the appearance color of other position of outer cover plate 310 and outer cover plate 310 correspond to the appearance color of optical fingerprint sensor position, and because ink layer 340 has equally distributed described perforate, the light of described backlight can through ink layer 340, therefore, optical fingerprint sensor need not consider the color of backlight, and also described perforate can also improve the fingerprint imaging effect of optical fingerprint sensor simultaneously.
Although the present invention discloses as above, the present invention is not defined in this.Any those skilled in the art, without departing from the spirit and scope of the present invention, all can make various changes or modifications, and therefore protection scope of the present invention should be as the criterion with claim limited range.
Claims (17)
1. an optical fingerprint sensor, is characterized in that, comprising:
Pixel substrate;
Ink layer, is positioned at described pixel substrate upper surface or is positioned at above described pixel substrate;
Described ink layer comprises equally distributed multiple perforate, and described perforated area accounts for 0.1% ~ 10% of whole described ink layer area.
2. optical fingerprint sensor as claimed in claim 1, it is characterized in that, described optical fingerprint sensor also comprises cover sheet, and described cover sheet is positioned at above described pixel substrate, and described ink layer is positioned at upper surface or the lower surface of described cover sheet.
3. optical fingerprint sensor as claimed in claim 2, it is characterized in that, described ink layer is positioned at the upper surface of described cover sheet, and described ink layer is covered by scratch resistant layer.
4. optical fingerprint sensor as claimed in claim 1, it is characterized in that, described pixel substrate has pel array, described pel array has multiple pixel, the plan view shape of each described pixel is rectangle, the length of side of described rectangle is more than or equal to 10 μm, and the plan view shape of described perforate is parallelogram, and the distance between described parallelogram opposite side is 1 μm ~ 3 μm.
5. optical fingerprint sensor as claimed in claim 1, it is characterized in that having glue-line between described ink layer and each surface, described ink layer is fixed on each surface by described glue-line.
6. optical fingerprint sensor as claimed in claim 5, it is characterized in that, the thickness of described ink layer is 5 μm ~ 20 μm, and the thickness of described glue-line is less than 10 μm.
7. the optical fingerprint sensor as described in any one of claim 1 to 6, is characterized in that, described perforated area accounts for 2% ~ 4% of whole described ink layer area.
8. the optical fingerprint sensor as described in any one of claim 1 to 6, it is characterized in that, described ink layer comprise multiple be intervally arranged the first axis the first ink strip and be multiplely intervally arranged in the second ink strip of the second axis, described perforate is surrounded by described first ink strip and the second ink strip.
9. an electronic product, is characterized in that, comprising:
Optical fingerprint sensor, described optical fingerprint sensor has pixel substrate;
Outer cover plate, be positioned at above described pixel substrate, described outer cover plate has through hole or blind hole, and described through hole runs through upper surface and the lower surface of described outer cover plate, and described blind hole is positioned at upper surface or the lower surface of described outer cover plate;
Ink layer, is positioned at described pixel substrate upper surface or is positioned at above described pixel substrate;
Described ink layer comprises equally distributed multiple perforate, and the area of described perforate accounts for 0.1% ~ 10% of whole described ink layer area.
10. electronic product as claimed in claim 9; it is characterized in that; described outer cover plate has described through hole; described optical fingerprint sensor also comprises the cover sheet be positioned at above described pixel substrate; described cover sheet is assemblied in described through hole, and described ink layer is positioned at upper surface or the lower surface of described cover sheet.
11. electronic products as claimed in claim 10, it is characterized in that, described ink layer is positioned at the upper surface of described cover sheet, and described ink layer is covered by scratch resistant layer.
12. electronic products as claimed in claim 9, it is characterized in that, described outer cover plate has described blind hole, and described ink layer is positioned at the position of the corresponding described blind hole of described outer cover plate inside surface, or described ink layer is positioned at the position of the corresponding described blind hole of described outer cover plate outside surface.
13. electronic products as claimed in claim 9, it is characterized in that, described pixel substrate has pel array, described pel array has multiple pixel, the plan view shape of each described pixel is rectangle, the length of side of described rectangle is more than or equal to 10 μm, and the plan view shape of described perforate is parallelogram, and the distance between described parallelogram opposite side is 1 μm ~ 3 μm.
14. electronic products as claimed in claim 9, it is characterized in that having glue-line between described ink layer and each surface, described ink layer is fixed on each surface by described glue-line.
15. electronic products as claimed in claim 14, is characterized in that, the thickness of described ink layer is 5 μm ~ 20 μm, and the thickness of described glue-line is less than 10 μm.
16. electronic products as described in any one of claim 9 to 15, it is characterized in that, described perforated area accounts for 2% ~ 4% of whole described ink layer area.
17. electronic products as described in any one of claim 9 to 15, it is characterized in that, described ink layer comprise multiple be intervally arranged the first axis the first ink strip and be multiplely intervally arranged in the second ink strip of the second axis, described perforate is surrounded by described first ink strip and the second ink strip.
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| CN201510500285.XA CN105184230B (en) | 2015-08-14 | 2015-08-14 | Optical fingerprint sensor and electronic product |
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