CN113851518B - Display module, display device and data processing method - Google Patents
Display module, display device and data processing method Download PDFInfo
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- CN113851518B CN113851518B CN202111143814.7A CN202111143814A CN113851518B CN 113851518 B CN113851518 B CN 113851518B CN 202111143814 A CN202111143814 A CN 202111143814A CN 113851518 B CN113851518 B CN 113851518B
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- H—ELECTRICITY
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- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/60—OLEDs integrated with inorganic light-sensitive elements, e.g. with inorganic solar cells or inorganic photodiodes
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- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/10—OLED displays
- H10K59/12—Active-matrix OLED [AMOLED] displays
- H10K59/121—Active-matrix OLED [AMOLED] displays characterised by the geometry or disposition of pixel elements
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- H—ELECTRICITY
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- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/30—Devices specially adapted for multicolour light emission
- H10K59/38—Devices specially adapted for multicolour light emission comprising colour filters or colour changing media [CCM]
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Abstract
The invention relates to the technical field of display equipment, in particular to a display module and a display device, and also relates to a data processing method. The display module comprises a plurality of pixel units distributed in rows and columns, each row of pixel units comprises a repeating unit which is sequentially arranged along the row direction, each repeating unit comprises three first sub-pixels, second sub-pixels and third sub-pixels with different colors, and each photosensitive element comprises a first photosensitive element which is positioned between the first sub-pixels and the second sub-pixels in the row direction and a second photosensitive element which is positioned between the second sub-pixels and the third sub-pixels in the row direction; the odd-numbered row pixel units and the even-numbered row pixel units are alternately arranged in the column direction. By optimizing the relative position relationship between the photosensitive element and the pixel unit and controlling the lighting mode of the grid pixels of the pixel unit, the proportion of stray light before reaching a finger when the light-emitting functional layer emits light to the photosensitive element is reduced, and the valley-ridge proportion is indirectly improved.
Description
Technical Field
The invention relates to the technical field of display equipment, in particular to a display module and a display device, and also relates to a data processing method.
Background
UTG is a thinner, stronger glass in ultra-thin folded screens, which is not only more ductile than CPI films, but also retains many of the advantages of the glass itself. In view of the market demand that UTG may bring in the future, an ultrathin folding screen with a fingerprint identification function is a trend of future mobile phones.
The current UTG fingerprint identification scheme discovers that the valley and ridge ratio in the fingerprint identification signal of the current product is smaller in the research process of improving the fingerprint identification precision, wherein the valley and ridge ratio is the ratio of valley and ridge difference to the total light flux received by a single Pixels Sensor, namely the effective signal quantity of the fingerprint is lower, so that the fingerprint identification precision is reduced.
Disclosure of Invention
In view of the above, the embodiment of the invention provides a display module, a display device and a data processing method, so as to solve the technical problem of low effective signal quantity of a fingerprint identification scheme in the prior art.
In order to achieve the above object, according to an aspect of an embodiment of the present invention, there is provided a display module.
The display module provided by the embodiment of the invention comprises a substrate, an optical detection layer, a pixel definition layer, a packaging layer, a touch control layer and a light filtering layer which are sequentially stacked, wherein a plurality of photosensitive elements with the same size are distributed in the optical detection layer, a plurality of pixel units distributed in rows and columns are distributed in the pixel definition layer, the light filtering layer comprises a plurality of color film units corresponding to the pixel units and light shielding units positioned between the color film units, and a plurality of openings corresponding to the photosensitive elements are formed in the light shielding units;
each row of the pixel units comprises a repeating unit which is sequentially arranged along the row direction, the repeating unit sequentially comprises three first sub-pixels, second sub-pixels and third sub-pixels with different colors, and the photosensitive elements comprise a first photosensitive element which is positioned between the first sub-pixels and the second sub-pixels in the row direction and a second photosensitive element which is positioned between the second sub-pixels and the third sub-pixels in the row direction;
the odd-numbered row pixel units and the even-numbered row pixel units are alternately arranged in the column direction, one first sub-pixel in any row is in the same column as one second photosensitive element in the adjacent row, and one third sub-pixel in any row is in the same column as one first photosensitive element in the adjacent row.
Further, the size and position parameters of the photosensitive element satisfy
min(s 1 -d x /2-d W /2，s 2 -d y /2-d L /2，s 3 )≥(2h 2 +h 3 )*tanα，
Wherein:
s 1 a distance between the center of the photosensitive area of the first photosensitive element and the center of the adjacent third sub-pixel in the same row in the row direction;
d x a dimension in a row direction of a photosensitive region of the photosensitive element;
d y a size of a photosensitive region of the photosensitive element in a column direction;
s 2 a distance between the center of the photosensitive area of the first photosensitive element and the center of the adjacent third sub-pixel in the same column in the column direction;
s 3 a minimum distance between the orthographic projection of the second sub-pixel on the substrate and the orthographic projection of the photosensitive region of the photosensitive element in the adjacent row on the substrate;
alpha is the maximum light emitting angle of the pixel unit;
h 2 an interlayer distance between the light-emitting functional layer and the packaging layer of the pixel unit;
h 3 an interlayer distance between the light-emitting functional layer and a photosensitive region of the photosensitive element;
d W a width in a row direction of the third sub-pixel;
d L is the length of the third sub-pixel in the column direction.
Further, s 1 Is 60-72 mu m, d x Is 7 μm to 12 μm, d y Is 7 μm to 30 μm, s 3 35-50 μm, alpha is 60-70 deg. and h 2 Is 4-12 mu m, s 2 Is 60-72 mu m, h 3 Is 2-6 μm, d w 15-20 μm, d L 40-60 μm.
Further, the size and position parameters of the photosensitive element satisfy
min(s 1 -d x /2-d W /2，s 2 -d y /2-d L /2，s 3 )≥(2h 1 +h 3 )*tanα，
Wherein:
h 1 the interlayer distance between the light-emitting functional layer and the filter layer.
Further, h 1 The range of the value of (C) is 6-14 μm.
In order to achieve the above object, according to a second aspect of the embodiments of the present invention, there is further provided a display device, which includes the display module set provided in the first aspect of the embodiments of the present invention, and an ultrathin glass cover plate disposed on a side of the optical filter layer facing away from the substrate.
In order to achieve the above object, according to a third aspect of the embodiment of the present invention, there is further provided a data processing method, where the data processing method is applied to the display module provided in the first aspect of the embodiment of the present invention.
The data processing method provided by the embodiment of the invention comprises the following steps:
illuminating the first sub-pixel or the third sub-pixel;
the photosensitive element acquires line identification data;
and eliminating the line identification data obtained by one or more photosensitive elements adjacent to the lighted sub-pixel in the obtained line identification data, and reserving the line identification data obtained by other photosensitive elements as effective data.
Further, in the step of lighting the first sub-pixel or the third sub-pixel, all of the first sub-pixel or all of the third sub-pixel is lighted.
Further, in the step of lighting the first sub-pixel or the third sub-pixel, a part of the first sub-pixel or a part of the third sub-pixel is lighted.
Further, the pitch of adjacent lit sub-pixels is not more than 4 times the pixel pitch.
In order to achieve the above object, according to a fourth aspect of the embodiment of the present invention, there is further provided another data processing method, where the data processing method is applied to the display module provided in the first aspect of the embodiment of the present invention.
The data processing method provided by the embodiment of the invention comprises the following steps:
illuminating one of the first sub-pixel and the third sub-pixel;
the photosensitive element acquires first line identification data;
eliminating the line identification data obtained by one or more photosensitive elements adjacent to the lighted sub-pixel in the obtained first line identification data, and reserving the line identification data obtained by other photosensitive elements as first effective data;
illuminating the other of the first sub-pixel and the third sub-pixel;
the photosensitive element acquires second line identification data;
eliminating the line identification data obtained by the photosensitive elements adjacent to the lighted sub-pixels from the obtained second line identification data, and reserving the line identification data obtained by other photosensitive elements as second effective data;
and combining the first effective data with the second effective data to obtain target effective data.
According to the embodiment of the invention, the relative position relation between the photosensitive element and the pixel unit is optimized, and the proportion of stray light before reaching a finger when the light-emitting functional layer emits light to the photosensitive element is reduced by controlling the lighting mode of the grid pixels of the pixel unit, so that the valley-ridge proportion is indirectly improved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, are included to provide a further understanding of the application and to provide a further understanding of the application with regard to the other features, objects and advantages of the application. The drawings of the illustrative embodiments of the present application and their descriptions are for the purpose of illustrating the present application and are not to be construed as unduly limiting the present application. In the drawings:
fig. 1 is a cross-sectional view of a display module according to an embodiment of the invention;
FIG. 2 is a schematic diagram of an array arrangement of photosensitive elements and pixels in a display module according to an embodiment of the present invention;
FIG. 3 is a structural layout of a display module provided by an embodiment of the present invention;
fig. 4 is an enlarged view of a portion a in fig. 3;
FIG. 5 is an enlarged view of one of the repeat units of FIG. 2;
FIG. 6 is a cross-sectional view of the structure corresponding to FIG. 5;
fig. 7 is a schematic structural diagram of a lighting mode of the display module provided in the embodiment of the invention;
FIG. 8 is an optical tracking evaluation chart affected by stray light reflected by the encapsulation layer in the lighting mode of FIG. 7;
FIG. 9 is a graph of simulated light affected by stray light reflected from the encapsulant layer in the light-up mode of FIG. 7;
fig. 10 is a schematic structural diagram of a lighting mode of a display module according to an embodiment of the present invention;
FIG. 11 is an optical tracking evaluation chart affected by stray light reflected by the encapsulation layer in the lighting mode of FIG. 10;
fig. 12 is a schematic structural diagram of a lighting mode of the display module provided in the embodiment of the invention;
fig. 13 is a schematic structural diagram of a lighting mode of the display module provided in the embodiment of the invention;
FIG. 14 is a graph showing simulated light affected by stray light reflected from the touch layer and the filter layer in the lighting mode of FIG. 7;
fig. 15 is a schematic structural diagram of a lighting mode of the display module provided in the embodiment of the invention;
fig. 16 is a schematic view showing the formation of a surface light source after the pixels are lit as shown in fig. 15; and
fig. 17 to 19 are fingerprint images obtained by each display module in the embodiment of the present invention.
In the figure:
1. a substrate; 2. a driving circuit layer; 3. an optical detection layer; 4. a pixel definition layer; 5. an encapsulation layer; 6. a touch layer; 7. a filter layer; 701. a color film unit; 702. a light shielding unit; 8. an ultra-thin glass cover plate; 9. a pixel unit; 901. an anode; 902. a light-emitting functional layer; 903. a cathode; 9-1, a first subpixel; 9-2, a second subpixel; 9-3, a third subpixel; 10. a photosensitive element; 10-1, a first photosensitive element; 10-2, a second photosensitive element; 1001. a bottom electrode; 1002. a PIN structure; 11. an opening; 12. and a touch structure.
Detailed Description
In order to make the present application solution better understood by those skilled in the art, the following description will be made in detail and with reference to the accompanying drawings in the embodiments of the present application, it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, shall fall within the scope of the present application.
It should be noted that the terms "comprising" and "having," and any variations thereof, in the description and claims of the present application and in the foregoing figures, are intended to cover a non-exclusive inclusion, such that a system, article, or apparatus that comprises a list of elements is not necessarily limited to those elements expressly listed but may include other elements not expressly listed or inherent to such article or apparatus.
In the present application, the terms "upper", "lower", "inner", "middle", "outer", and the like indicate an azimuth or a positional relationship based on the azimuth or the positional relationship shown in the drawings. These terms are used primarily to better describe the present application and its embodiments and are not intended to limit the indicated device, element or component to a particular orientation or to be constructed and operated in a particular orientation.
Also, some of the terms described above may be used to indicate other meanings in addition to orientation or positional relationships, for example, the term "upper" may also be used to indicate some sort of attachment or connection in some cases. The specific meaning of these terms in this application will be understood by those of ordinary skill in the art as appropriate.
Furthermore, the terms "disposed," "connected," "secured" and "affixed" are to be construed broadly. For example, "connected" may be in a fixed connection, a removable connection, or a unitary construction; may be a mechanical connection, or an electrical connection; may be directly connected, or indirectly connected through intervening media, or may be in internal communication between two devices, elements, or components. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art as the case may be.
It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other.
Optical fingerprint recognition is one of means for realizing fingerprint recognition. The principle of optical fingerprint identification is as follows: when the finger is placed above the display product, the light emitted by the light source contained in the display product irradiates the positions of the valleys and the ridges of the finger, and is reflected by the valleys and the ridges of the finger and then enters the photosensitive element contained in the display product. Because the light intensity reflected by the positions of the valleys and the ridges is different, the photosensitive element generates different electric signals according to the difference of the reflected light intensity, and fingerprint identification is realized.
The technical staff researches find that in the fingerprint identification process, the valley and ridge signal quantity truly carrying fingerprint characteristic signals in the total luminous flux (signal quantity) received by the photosensitive element only accounts for less than 50 percent. The light-sensitive element has the limitation of full well capacity, the increase of the light source intensity can not indirectly increase the valley-ridge ratio, because the total luminous flux received by the light-sensitive element comprises at least three parts, the first part is the valley-ridge luminous flux with lines, the second part is the luminous flux of stray light reflected by the packaging layer in the product structure, and the third part is the luminous flux of stray light reflected by the filter layer (color film layer) in the product structure. Wherein the luminous flux of the second and third portions is substantially more than 50%. If the influence of stray light of the second part and the third part can be reduced from design, the valley-ridge ratio is indirectly improved.
Based on this, as shown in fig. 1-3, the display module includes a substrate 1, a driving circuit layer 2, an optical detection layer 3, a pixel definition layer 4, a packaging layer 5, a touch layer 6, a light filtering layer 7 and an ultrathin glass cover plate 8 that are sequentially stacked, wherein a plurality of photosensitive elements 10 with the same size and specification are distributed in the optical detection layer 3, a plurality of pixel units 9 distributed in rows and columns are distributed in the pixel definition layer 4, the light filtering layer 7 includes a plurality of color film units 701 corresponding to the pixel units 9 and a light shielding unit 702 located between the color film units 701, and a plurality of openings 11 corresponding to the photosensitive elements 10 are formed on the light shielding unit 702, that is, the orthographic projection of the openings 11 on the substrate 1 and the orthographic projection of the photosensitive elements 10 on the substrate 1 overlap each other. Wherein, the touch control layer 6 is internally provided with a touch control structure 12, the orthographic projection of the touch control structure 12 on the substrate 1 is positioned in the orthographic projection of the light shielding unit 702 on the substrate 1, the orthographic projection of the opening 11 on the substrate 1 and the orthographic projection of the photosensitive element 10 on the substrate 1 are overlapped, and the orthographic projection of the touch control structure 12 on the substrate 1 and the orthographic projection of the opening 11 on the substrate 1 are not overlapped; the ultra-thin glass cover plate 8 maintains the characteristics of glass and has good flexibility, so that the requirements of folded products can be completely met.
By arranging the opening 11 which is mutually overlapped with the photosensitive element 10 in the light shielding unit 702 and arranging the touch structure 12 to avoid the opening 11, shielding of light reflected by the fingerprint by the light shielding unit 702 and the touch structure 12 is avoided, so that the transmittance of the light reflected by the fingerprint is effectively improved, and the definition of fingerprint identification is remarkably improved.
The basic principle of fingerprint identification of the display module is as follows: when a finger contacts the ultrathin glass cover plate 8 of the display module, the pixels are controlled to be lightened to emit light, the light is emitted from the luminous functional layer 902 of the pixel unit 9, then upwards passes through the packaging layer 5, the touch layer 6, the opening 11 of the filter layer 7 and the ultrathin glass cover plate 8 of the display module respectively and reaches a fingerprint interface, namely the contact interface between the finger and the ultrathin glass cover plate 8, and the light reflected and scattered back on the interface reversely passes through the film layers to reach the photosensitive element 10 again and then is received and converted into an electric signal, and fingerprint identification is performed according to different signals reflected by valley and ridge.
The pixel unit 9 includes a plurality of sub-pixels, and each sub-pixel may include an anode 901, a light emitting functional layer 902, and a cathode 903 which are sequentially stacked; the light emitting functional layer 902 includes, but is not limited to, a hole injection layer, a hole transport layer, an electron blocking layer, a light emitting material layer, a hole blocking layer, an electron transport layer, and an electron injection layer. The photosensitive element 10 may include a bottom electrode 1001, a top electrode, and a PIN structure 1002 therebetween.
In the embodiment of the present invention, as shown in fig. 2, the pixel units 9 are distributed in rows and columns, each row of the pixel units 9 includes a repeating unit sequentially arranged along a row direction, the repeating unit sequentially includes three first sub-pixels 9-1, second sub-pixels 9-2, and third sub-pixels 9-3 of different colors, and the photosensitive element 10 includes a first photosensitive element 10-1 located between the first sub-pixels 9-1 and the second sub-pixels 9-2 in the row direction and a second photosensitive element 10-2 located between the second sub-pixels 9-2 and the third sub-pixels 9-3 in the row direction; i.e. the front projection of the first light-sensing element 10-1 onto the substrate 1 is located at the gap of the front projection of the first sub-pixel 9-1 and the second sub-pixel 9-2 onto the substrate 1, and the front projection of the second light-sensing element 10-2 onto the substrate 1 is located at the gap of the front projection of the second sub-pixel 9-2 and the third sub-pixel 9-3 onto the substrate 1. Further, the odd-numbered row pixel units 9 and the even-numbered row pixel units 9 are alternately arranged in the column direction, and one of the first sub-pixels 9-1 in any one row is in the same column as one of the second photosensitive elements 10-2 in the adjacent row, and one of the third sub-pixels 9-3 in any one row is in the same column as one of the first photosensitive elements 10-1 in the adjacent row.
In the array arrangement of the substrate structures of the display module of the above embodiment, the repeating unit shown in fig. 5 may be obtained, and the positional relationship between the photosensitive element 10 and each sub-pixel is shown in fig. 5, where (1), (2), (3), and (4) represent one detection area, respectively, and the arrangement of the photosensitive element 10 in the entire display module is performed by using the unit composed of (1) (2) (3) (4) as the repeating unit. It can be seen that the position of the first photosensitive element 10-1 in (1) (4) is fixed relative to the first subpixel 9-1; (2) the position of the second photosensitive element 10-2 in (3) is fixed with respect to the third sub-pixel 9-3, and the area size and specification of the photosensitive element 10 are the same in the four areas of (1) (2) (3) (4). In combination with the schematic diagram of the optical path in fig. 6, in order to reduce the ratio of stray light generated before reaching the finger when the light-emitting functional layer 902 emits light to the photosensitive element 10, further improve the ratio of fingerprint ridges to valleys, the size and position parameters of the photosensitive element 10 in the embodiment of the present invention need to satisfy the following relationship:
min(s 1 -d x /2-d W /2，s 2 -d y /2-d L /2，s 3 )≥(2h 2 +h 3 )*tanα (1)，
wherein:
s 1 a distance between the center of the photosensitive region of the first photosensitive element and the center of the adjacent third sub-pixel 9-3 in the same row in the row direction;
d x a dimension in a row direction of a photosensitive region of the photosensitive element 10;
d y a size in the column direction of the photosensitive area of the photosensitive element 10;
s 2 a distance between the center of the photosensitive area of the first photosensitive element and the center of the adjacent third sub-pixel in the same column in the column direction;
s 3 minimum spacing for orthographic projection of the second sub-pixel 9-2 on the substrate 1 and orthographic projection of a photosensitive region of the photosensitive element 10 in an adjacent row on the substrate 1;
alpha is the maximum light emitting angle of the pixel unit 9;
h 2 the layer spacing between the light emitting functional layer 902 and the encapsulation layer 5 of the pixel unit 9, specifically, the spacing between the light emitting surface of the light emitting functional layer 902 and the surface of the encapsulation layer 5 on the side facing away from the substrate 1;
h 3 the layer spacing between the light emitting functional layer 902 and the photosensitive area of the photosensitive element 10 is specifically the spacing between the light emitting surface of the light emitting functional layer 902 and the photosensitive surface of the photosensitive element 10;
d W for the width of the third sub-pixel in the row direction, i.e. the size of the opening of the pixel defining layer in relation to the row direction of the third sub-pixel, where d of all pixel cells w Are all identical. The method comprises the steps of carrying out a first treatment on the surface of the
d L The length of the third sub-pixel in the column direction, i.e. the size of the opening of the pixel defining layer with respect to the column direction of the third sub-pixel.
Optionally, in the display module provided by the embodiment of the present invention, in order to obtain a better fingerprint valley-ridge duty ratio improving effect, s 1 The value of (d) can be 60-72 mu m x The range of the value of (C) can be 7 mu m to 12 mu mm，d y The value of (2) can be 7-30 μm, s 2 The value of (2) can be 60-72 mu m, s 3 The range of the value of (a) can be 35-50 mu m, the range of the value of alpha can be 60-70 DEG, and h 2 The range of the value of (a) can be 4-12 mu m, h 3 The value of (d) can be 2-6 μm w The value of (d) can be 15-20 μm L The range of values of (2) may be 40 μm to 60. Mu.m.
By the definition of the formula (1), the stray proportion caused by the reflection of the light by the encapsulation layer 5 can be effectively reduced.
Specifically, the light emitting functional layer 902 in the sub-pixel in the embodiment of the present invention may be a red light emitting functional layer 902, a green light emitting functional layer 902, and a blue light emitting slave functional layer. Accordingly, the color film unit 701 may include a red color film, a green color film, and a blue color film. For convenience of description, the display module of the embodiment of the present invention will be further described by taking the first subpixel 9-1 as the B pixel, the second subpixel 9-2 as the G pixel, and the third subpixel 9-3 as the R pixel as examples.
A specific embodiment is given below to illustrate the feasibility of the present solution, where the structural parameters of the display module in fig. 2-6 are designed according to formula (1), and then as shown in fig. 7, only the R pixels in the area of each repeating unit (2) are turned on to reduce the proportion of stray caused by reflection of each film layer of the package layer 5. Fig. 8 is a diagram of the light simulation results of the light reflected by the encapsulation layer 5 received by the light sensitive elements 10 in the four regions of (1) (2) (3) (4) according to the actual size design, and fig. 9 is a diagram of the light simulation results of the light sensitive elements in each region affected by the light sensitive elements in the four regions of (1) (2) (3) (4) from left to right, wherein the larger the number on the diagram indicates the larger the received light quantity, the larger the affected light quantity. It can be seen that the second photosensitive element 10-2 in the (2) region is immediately adjacent to the R pixel that emits light, and is most severely affected by stray light, while the three photosensitive elements 10 in the three regions (1) (3) (4) are reasonably designed by the scheme, and are hardly affected by stray light.
Fig. 8 and 9 show the effect of stray light reflected from the encapsulation layer 5 after only one of the R pixels in each repeating unit is lit. As shown in fig. 10, fingerprint recognition is performed by lighting all R pixels, and the result of the influence of the stray light reflected by the encapsulation layer 5 is shown in fig. 11, it can be seen that after lighting all R pixels, the second photosensitive elements 10-2 in the (2) (3) region are adjacent to the R pixels that emit light, and are seriously influenced by the stray light, and the two first photosensitive elements 10-1 in the (1) (4) region are reasonably designed according to the scheme and are hardly influenced by the stray light.
Based on this, the embodiment of the invention provides a data processing method, which is applied to the display module provided by the embodiment of the invention.
The data processing method provided by the embodiment of the invention comprises the following steps: first, the first sub-pixel 9-1 or the third sub-pixel 9-3 is turned on; then obtaining line identification data through the photosensitive element 10; the pattern recognition data obtained by one or more photosensitive elements 10 next to the lighted sub-pixel is eliminated from the obtained pattern recognition data, and the pattern recognition data obtained by other photosensitive elements 10 is retained as valid data. In the above embodiment, whether to eliminate the pattern recognition data obtained by the one photosensitive element 10 immediately adjacent to the lighted sub-pixel or to eliminate the pattern recognition data obtained by the plurality of photosensitive elements 10 immediately adjacent to the lighted sub-pixel is determined according to specific design conditions and experimental simulation results, for example, in the structural design corresponding to fig. 7 to 11, only the one photosensitive element 10 immediately adjacent to the lighted sub-pixel is affected by stray light, and only the pattern recognition data of the one photosensitive element 10 immediately adjacent to the lighted sub-pixel is eliminated.
In the step of lighting the first sub-pixel 9-1 or the third sub-pixel 9-3 in the above processing method, all of the first sub-pixel 9-1 or all of the third sub-pixel 9-3 may be selectively lit, or a part of the first sub-pixel 9-1 or a part of the third sub-pixel 9-3 may be selectively lit.
For example, as shown in fig. 12, if all R pixels in the display module are selectively lit, it is necessary to eliminate, in the subsequent processing step, the line identification data obtained by the photosensitive element 10 immediately adjacent to the R pixel, that is, the line identification data of all the second photosensitive elements 10-2, and only the line identification data obtained by the first photosensitive element 10-1 is retained as effective data, and the corresponding photosensitive element 10 whose line identification data obtained by the first photosensitive element is required to be eliminated is filled with intersecting lines in fig. 12.
As shown in fig. 13, if all the B pixels in the display module are selectively turned on, then in the subsequent processing steps, the line identification data obtained by the photosensitive elements 10 adjacent to the B pixels need to be eliminated, that is, the line identification data of all the first photosensitive elements 10-1 need to be eliminated, only the line identification data obtained by the second photosensitive element 10-2 is reserved as effective data, and the corresponding photosensitive elements 10, whose line identification data is required to be eliminated, in fig. 13 are filled by intersecting lines.
In the above-mentioned embodiments of the present invention, the influence of stray light reflected by the encapsulation layer 5 on the photosensitive element 10 to collect fingerprints is specifically reduced when the light-emitting functional layer 902 emits light, but the stray light reflected by the filter layer 7 and the touch layer 6 in the display module also affects the photosensitive element 10, and the distances between the filter layer 7 and the touch layer 6 and the photosensitive element 10 are larger, so that the influence of the stray light is thoroughly avoided by the above-mentioned embodiments of the present invention. For example, as shown in fig. 7, by lighting only the R pixels in the (2) th region in the repeating unit, the effect results of the light receiving elements 10 in the four regions of (1) (2) (3) (4) receiving the stray light reflected by the filter layer 7 and the touch layer 6 are shown in fig. 14, and fig. 14 is a graph of the light simulation results of the light receiving elements in the respective regions affected by the stray light, the light receiving elements in the four regions corresponding to (1) (2) (3) (4) from left to right in the figure, respectively, the larger the numbers on the graph indicate the larger the amount of light received by the light receiving elements, the larger the influence of the stray light. It can be seen that the photosensitive elements 10 in the four regions (1), (2), (3) and (4) are affected to different degrees by the stray light reflected by the filter layer 7 and the touch layer 6, wherein the photosensitive elements 10 located in the region (2) and adjacent to the R pixel to be lighted are affected most severely, and the photosensitive elements 10 in the other three regions are affected to some extent.
Based on this, the skilled person optimizes formula (1) in order to reduce both the proportion of stray light reflected by the encapsulation layer 5 and the influence of stray light reflected by the filter layer 7 and the touch layer 6. When the size and position parameters of the photosensitive element 10 satisfy the following formula (2), the stray ratio of the light reflection of the optical filter layer 7 and the touch layer 6 can be effectively reduced.
min(s 1 -d x /2-d W /2，s 1 -d y /2-d L /2，s 3 )≥(2h 1 +h 3 )*tanα (2)，
Wherein:
h 1 for the layer spacing h between the light-emitting functional layer 902 and the filter layer 7 1 The value range of (a) is 6-14 μm, and is specifically the distance between the light emitting surface of the light emitting functional layer 902 and the surface of the light filtering layer 7 facing the substrate 1, because the thickness of the touch layer is small relative to other film structures, h 1 Can be used for characterizing the distance between the touch control layer and the luminous functional layer at the same time.
As can be seen from the results of fig. 13, the stray light reflected by the filter layer 7 and the touch layer 6 affects not only the photosensitive elements 10 immediately adjacent to the lighted pixel, but also a plurality of photosensitive elements 10 within a certain range around the same, based on which, in the process of data acquisition and processing, the interval between the lighted pixels needs to be controlled, and by increasing the interval between the lighted pixels, the influence of the stray light reflected by the filter layer 7 and the touch layer 6 can be concentrated more on the photosensitive element 10 immediately adjacent thereto, but the interval between the lighted pixels cannot be increased without limitation, and it must also be ensured that the lighted pixels form a continuous surface light source at the fingerprint interface. Through design study, in order to enable discrete pixels to form a continuous area light source at a fingerprint interface after being lightened, the pixel interval L between adjacent lightened pixels is smaller than or equal to 4 times of the pixel interval P, namely: l is more than or equal to 0 and less than or equal to 4P, preferably more than or equal to 0 and less than or equal to 2P, wherein the value range of P is 80 mu m to 130 mu m.
As shown in fig. 15, which is a graph of the distribution effect of the photosensitive elements 10 according to the general formula (2) of the embodiment of the present invention, and the surface light source forming condition of the fingerprint interface obtained by controlling the pitch l=2p of the pixels to be lighted is shown in fig. 16, it can be seen that a more continuous surface light source can be formed.
Experiments show that after R pixels are turned on in a manner of controlling the pitch l=2p of the turned-on pixels, 5 of 9 photosensitive elements around the R pixels (photosensitive elements corresponding to the areas (1) - (5) in fig. 15) are affected by stray light reflected by the touch layer 6 and the filter layer 7, and this part of data needs to be removed during actual data processing, that is, five photosensitive elements affected by the stray light and being immediately adjacent to the turned-on sub-pixels need to be removed, at this time, the pattern recognition data of the five photosensitive elements immediately adjacent to the turned-on sub-pixels need to be removed, and other pattern recognition data is reserved as effective data. The corresponding photosensitive elements in fig. 15, whose acquired line identification data needs to be eliminated, are filled by intersecting lines.
In order to compare the technical effects of eliminating stray light among the technical schemes, the following three processing schemes are performed on the display module and the corresponding data processing modes.
Scheme one: the fingerprint detection display module in the prior art is adopted, wherein the area of a photosensitive device is 140 mu m 2 The illuminance on the photosensitive element 10 is 10lx, all pixels in the display module are controlled to be lightened, and the obtained fingerprint image is shown in fig. 17, wherein the valley-ridge ratio is 1.2%.
Scheme II: the same photosensitive area of 140 μm as in scheme one was used 2 The illuminance on the adopted photosensitive element 10 is also 10lx, the position relation between the photosensitive element 10 and the pixels is designed according to the formula (1), all R pixels in the display module are controlled to be lightened, the line identification data obtained by one photosensitive element 10 adjacent to the lightened R pixels is eliminated in the data processing process, the line identification data of other photosensitive elements 10 are used as effective data, the obtained fingerprint image is shown in fig. 18, and the valley-ridge ratio is 1.5%.
Scheme III: the same photosensitive area of 140 μm as in scheme one was used 2 The photosensitive element is adoptedThe illuminance on the member 10 was also 10lx, the positional relationship between the photosensitive elements 10 and the pixels was designed according to the formula (2), the R pixels were lit in such a manner as to control the pitch l=2p of the lit pixels, and the pattern recognition data obtained by the five photosensitive elements 10 immediately adjacent to the lit R pixels were eliminated during the data processing, the pattern recognition data of the other photosensitive elements 10 were taken as effective data, and the obtained fingerprint image had a valley-ridge ratio of 2.1% as shown in fig. 19.
TABLE 1 summary of effect indicators for schemes 1-3
As can be seen from table 1, when the area of the photosensitive area is the same, and the photosensitive elements reach the full wells (the illuminance received by the photosensitive elements just reaches the upper limit of 10 lx), the optimized design of the scheme two can increase the valley-ridge ratio from 1.2% to 1.5%, compared with the original design, the optimized design of the scheme three can increase the valley-ridge ratio from 1.2% to 2.1%, compared with the original design, the optimized design of the scheme three can increase the illuminance received by the photosensitive elements by 43%, and the feasibility of the technical scheme of the invention is further illustrated. According to the fingerprint imaging simulation evaluation graphs of fig. 17-19, it can be seen that, compared with fig. 17, each beam of light received by the photosensitive element can correspond to the valley and the ridge of the fingerprint more accurately, the influence of stray light crosstalk is less, and compared with fig. 17, the scheme corresponding to fig. 18 can realize more accurate fingerprint identification; compared with fig. 18, each beam of light received by the photosensitive element in fig. 19 can be more accurately corresponding to the valley and the ridge of the fingerprint, the influence of stray light crosstalk is smaller, and the scheme corresponding to fig. 19 can be used for more accurately identifying the fingerprint compared with fig. 18.
On the basis of the embodiment, the types of pixels in the display module can be lightened by adopting time-sharing control, and all acquired data of the photosensitive elements are fully utilized. Specifically, the data processing method includes the following steps: one of the first sub-pixel and the third sub-pixel is lightened, and the photosensitive element acquires first line identification data; eliminating the line identification data obtained by one or more photosensitive elements adjacent to the lighted sub-pixel in the obtained first line identification data, and reserving the line identification data obtained by other photosensitive elements as first effective data; illuminating the other of the first sub-pixel and the third sub-pixel; the photosensitive element acquires second line identification data; eliminating the line identification data obtained by the photosensitive elements adjacent to the lighted sub-pixels from the obtained second line identification data, and reserving the line identification data obtained by other photosensitive elements as second effective data; and combining the first effective data with the second effective data to obtain target effective data.
For example, on the basis of the above embodiment, the positional relationship between the photosensitive element and the pixels is designed according to the formula (1), all the R pixels are lighted up, and the photosensitive element acquires the first texture identification data; eliminating the line identification data obtained by one photosensitive element adjacent to the lighted R pixel in the obtained first line identification data, and reserving the line identification data obtained by other photosensitive elements as first effective data; then, all B pixels are lightened; the photosensitive element acquires second line identification data; eliminating the line identification data obtained by one photosensitive element adjacent to the lighted B pixel in the obtained second line identification data, and reserving the line identification data obtained by other photosensitive elements as second effective data; and combining the first effective data with the second effective data to obtain target effective data.
For example, on the basis of the above embodiment, the positional relationship between the photosensitive element and the pixel is designed according to the formula (2), the R pixel is lighted in such a manner that the pitch l=2p of the lighted pixel is controlled, and the photosensitive element acquires the first line identification data; eliminating the line identification data obtained by five photosensitive elements adjacent to the lighted R pixel in the obtained first line identification data, and reserving the line identification data obtained by other photosensitive elements as first effective data; then, the B pixel is lit up in such a manner that the pitch l=2p of the lit up pixel is controlled; the photosensitive element acquires second line identification data; eliminating the line identification data obtained by five photosensitive elements adjacent to the lighted B pixel in the obtained second line identification data, and reserving the line identification data obtained by other photosensitive elements as second effective data; and combining the first effective data with the second effective data to obtain target effective data.
The foregoing is illustrative of the embodiments of the present invention and the data processing method using the same, and other configurations of the display module will be apparent to those skilled in the art, and will not be described in detail herein, as persons skilled in the art will understand and practice the invention with reference to the description of the prior art.
The embodiment of the invention also provides a display device, which comprises the display module provided by the embodiment of the invention. The display device includes, but is not limited to, any product or component having a display function, such as a liquid crystal panel, electronic paper, mobile phone, tablet computer, television, display, notebook computer, etc. The display device disclosed in the embodiment of the present application, due to the adoption of the display module provided in the foregoing embodiment, has all the technical effects described above, and will not be described in detail herein. Other configurations, principles and methods of manufacturing display devices will be known to those of ordinary skill in the art and will not be described in detail herein.
In this specification, some embodiments are described in a progressive manner, and each embodiment focuses on a difference from other embodiments, and identical and similar parts between the embodiments are enough to refer to each other.
The foregoing is merely exemplary of embodiments of the present invention to enable those skilled in the art to understand or practice the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. The display module comprises a substrate, an optical detection layer, a pixel definition layer, a packaging layer, a touch control layer and a filter layer which are sequentially laminated, wherein a plurality of photosensitive elements with the same size are distributed in the optical detection layer, a plurality of pixel units distributed in rows and columns are distributed in the pixel definition layer, the filter layer comprises a plurality of color film units corresponding to the pixel units and a light shielding unit positioned between the color film units, a plurality of openings corresponding to the photosensitive elements are formed on the light shielding unit,
each row of the pixel units comprises a repeating unit which is sequentially arranged along the row direction, the repeating unit sequentially comprises three first sub-pixels, second sub-pixels and third sub-pixels with different colors, and the photosensitive elements comprise a first photosensitive element which is positioned between the first sub-pixels and the second sub-pixels in the row direction and a second photosensitive element which is positioned between the second sub-pixels and the third sub-pixels in the row direction;
the pixel units in odd lines and the pixel units in even lines are alternately arranged in the column direction, one first sub-pixel in any line is in the same column as one second photosensitive element in the adjacent line, and one third sub-pixel in any line is in the same column as one first photosensitive element in the adjacent line;
the size and position parameters of the photosensitive element meet
min(s 1 -d x /2-d W /2，s 2 -d y /2-d L /2，s 3 )≥(2h 2 +h 3 )*tanα，
Wherein:
s 1 a distance between the center of the photosensitive area of the first photosensitive element and the center of the adjacent third sub-pixel in the same row in the row direction;
d x a dimension in a row direction of a photosensitive region of the photosensitive element;
d y a size of a photosensitive region of the photosensitive element in a column direction;
s 2 a distance between the center of the photosensitive area of the first photosensitive element and the center of the adjacent third sub-pixel in the same column in the column direction;
s 3 for the second subA minimum spacing between an orthographic projection of a pixel on the substrate and an orthographic projection of a photosensitive region of a photosensitive element in an adjacent row on the substrate;
alpha is the maximum light emitting angle of the pixel unit;
h 2 an interlayer distance between the light-emitting functional layer and the packaging layer of the pixel unit;
h 3 an interlayer distance between the light-emitting functional layer and a photosensitive region of the photosensitive element;
d W a width in a row direction of the third sub-pixel;
d L is the length of the third sub-pixel in the column direction.
2. The display module of claim 1, wherein s 1 Is 60-72 mu m, d x Is 7 μm to 12 μm, d y Is 7 μm to 30 μm, s 2 Is 60-72 mu m, s 3 35-50 μm, alpha is 60-70 deg. and h 2 Is 4-12 mu m, h 3 Is 2-6 μm, d w 15-20 μm, d L 40-60 μm.
3. The display module of claim 1, wherein the size and position parameters of the photosensitive element satisfy
min(s 1 -d x /2-d W /2，s 2 -d y /2-d L /2，s 3 )≥(2h 1 +h 3 )*tanα，
Wherein:
h 1 the interlayer distance between the light-emitting functional layer and the filter layer.
4. A display module according to claim 3, wherein h 1 The range of the value of (C) is 6-14 μm.
5. A display device comprising the display module of any one of claims 1-4 and an ultra-thin glass cover plate disposed on a side of the filter layer facing away from the substrate.
6. A data processing method applied to the display module set according to any one of claims 1 to 4, wherein the method comprises the following steps:
illuminating the first sub-pixel or the third sub-pixel;
the photosensitive element acquires line identification data;
and eliminating the line identification data obtained by one or more photosensitive elements adjacent to the lighted sub-pixel in the obtained line identification data, and reserving the line identification data obtained by other photosensitive elements as effective data.
7. The data processing method according to claim 6, wherein in the step of lighting the first sub-pixel or the third sub-pixel, all of the first sub-pixel or all of the third sub-pixel is lighted.
8. The data processing method according to claim 6, wherein in the step of lighting the first sub-pixel or the third sub-pixel, a part of the first sub-pixel or a part of the third sub-pixel is lighted.
9. The data processing method of claim 8, wherein the pitch of adjacent lit sub-pixels is no more than 4 times the pixel pitch.
10. A data processing method applied to the display module set according to any one of claims 1 to 4, wherein the method comprises the following steps:
illuminating one of the first sub-pixel and the third sub-pixel;
the photosensitive element acquires first line identification data;
eliminating the line identification data obtained by one or more photosensitive elements adjacent to the lighted sub-pixel in the obtained first line identification data, and reserving the line identification data obtained by other photosensitive elements as first effective data;
illuminating the other of the first sub-pixel and the third sub-pixel;
the photosensitive element acquires second line identification data;
eliminating the line identification data obtained by the photosensitive elements adjacent to the lighted sub-pixels from the obtained second line identification data, and reserving the line identification data obtained by other photosensitive elements as second effective data;
and combining the first effective data with the second effective data to obtain target effective data.
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| WO2013014883A1 (en) * | 2011-07-25 | 2013-01-31 | パナソニック株式会社 | Display device |
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| WO2013014883A1 (en) * | 2011-07-25 | 2013-01-31 | パナソニック株式会社 | Display device |
| CN109801946A (en) * | 2019-01-30 | 2019-05-24 | 京东方科技集团股份有限公司 | Display panel and display device |
| CN111597892A (en) * | 2020-04-14 | 2020-08-28 | 武汉天马微电子有限公司 | Display panel and display device |
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